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- Changes in version 0.3.3.8 - 2018-07-09
- Tor 0.3.3.8 backports several changes from the 0.3.4.x series, including
- fixes for a memory leak affecting directory authorities.
- o Major bugfixes (directory authority, backport from 0.3.4.3-alpha):
- - Stop leaking memory on directory authorities when planning to
- vote. This bug was crashing authorities by exhausting their
- memory. Fixes bug 26435; bugfix on 0.3.3.6.
- o Major bugfixes (rust, testing, backport from 0.3.4.3-alpha):
- - Make sure that failing tests in Rust will actually cause the build
- to fail: previously, they were ignored. Fixes bug 26258; bugfix
- on 0.3.3.4-alpha.
- o Minor features (compilation, backport from 0.3.4.4-rc):
- - When building Tor, prefer to use Python 3 over Python 2, and more
- recent (contemplated) versions over older ones. Closes
- ticket 26372.
- o Minor features (geoip):
- - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
- Country database. Closes ticket 26674.
- o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
- - Add several checks to detect whether Tor relays are uploading
- their descriptors without specifying why they regenerated them.
- Diagnostic for ticket 25686.
- o Minor bugfixes (circuit path selection, backport from 0.3.4.1-alpha):
- - Don't count path selection failures as circuit build failures.
- This change should eliminate cases where Tor blames its guard or
- the network for situations like insufficient microdescriptors
- and/or overly restrictive torrc settings. Fixes bug 25705; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
- - Fix a compilation warning on some versions of GCC when building
- code that calls routerinfo_get_my_routerinfo() twice, assuming
- that the second call will succeed if the first one did. Fixes bug
- 26269; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (control port, backport from 0.3.4.4-rc):
- - Handle the HSADDRESS= argument to the HSPOST command properly.
- (Previously, this argument was misparsed and thus ignored.) Fixes
- bug 26523; bugfix on 0.3.3.1-alpha. Patch by "akwizgran".
- o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
- - Fix a number of small memory leaks identified by coverity. Fixes
- bug 26467; bugfix on numerous Tor versions.
- o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
- - Relays now correctly block attempts to re-extend to the previous
- relay by Ed25519 identity. Previously they would warn in this
- case, but not actually reject the attempt. Fixes bug 26158; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (restart-in-process, backport from 0.3.4.1-alpha):
- - When shutting down, Tor now clears all the flags in the control.c
- module. This should prevent a bug where authentication cookies are
- not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
- - When running the hs_ntor_ref.py test, make sure only to pass
- strings (rather than "bytes" objects) to the Python subprocess
- module. Python 3 on Windows seems to require this. Fixes bug
- 26535; bugfix on 0.3.1.1-alpha.
- - When running the ntor_ref.py test, make sure only to pass strings
- (rather than "bytes" objects) to the Python subprocess module.
- Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
- on 0.2.5.5-alpha.
- Changes in version 0.3.4.4-rc - 2018-07-09
- Tor 0.3.4.4-rc fixes several small compilation, portability, and
- correctness issues in previous versions of Tor. This version is a
- release candidate: if no serious bugs are found, we expect that the
- stable 0.3.4 release will be (almost) the same as this release.
- o Minor features (compilation):
- - When building Tor, prefer to use Python 3 over Python 2, and more
- recent (contemplated) versions over older ones. Closes
- ticket 26372.
- o Minor features (geoip):
- - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
- Country database. Closes ticket 26674.
- o Minor features (Rust, portability):
- - Rust cross-compilation is now supported. Closes ticket 25895.
- o Minor bugfixes (compilation):
- - Fix a compilation warning on some versions of GCC when building
- code that calls routerinfo_get_my_routerinfo() twice, assuming
- that the second call will succeed if the first one did. Fixes bug
- 26269; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (control port):
- - Report the port correctly when a port is configured to bind to
- "auto". Fixes bug 26568; bugfix on 0.3.4.1-alpha.
- - Handle the HSADDRESS= argument to the HSPOST command properly.
- (Previously, this argument was misparsed and thus ignored.) Fixes
- bug 26523; bugfix on 0.3.3.1-alpha. Patch by "akwizgran".
- o Minor bugfixes (correctness, flow control):
- - Upon receiving a stream-level SENDME cell, verify that our window
- has not grown too large. Fixes bug 26214; bugfix on svn
- r54 (pre-0.0.1).
- o Minor bugfixes (memory, correctness):
- - Fix a number of small memory leaks identified by coverity. Fixes
- bug 26467; bugfix on numerous Tor versions.
- o Minor bugfixes (testing, compatibility):
- - When running the hs_ntor_ref.py test, make sure only to pass
- strings (rather than "bytes" objects) to the Python subprocess
- module. Python 3 on Windows seems to require this. Fixes bug
- 26535; bugfix on 0.3.1.1-alpha.
- - When running the ntor_ref.py test, make sure only to pass strings
- (rather than "bytes" objects) to the Python subprocess module.
- Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
- on 0.2.5.5-alpha.
- Changes in version 0.3.4.3-alpha - 2018-06-26
- Tor 0.3.4.3-alpha fixes several bugs in earlier versions, including
- one that was causing stability issues on directory authorities.
- o Major bugfixes (directory authority):
- - Stop leaking memory on directory authorities when planning to
- vote. This bug was crashing authorities by exhausting their
- memory. Fixes bug 26435; bugfix on 0.3.3.6.
- o Major bugfixes (rust, testing):
- - Make sure that failing tests in Rust will actually cause the build
- to fail: previously, they were ignored. Fixes bug 26258; bugfix
- on 0.3.3.4-alpha.
- o Minor feature (directory authorities):
- - Stop warning about incomplete bw lines before the first complete
- bw line has been found, so that additional header lines can be
- ignored. Fixes bug 25960; bugfix on 0.2.2.1-alpha
- o Minor features (relay, diagnostic):
- - Add several checks to detect whether Tor relays are uploading
- their descriptors without specifying why they regenerated them.
- Diagnostic for ticket 25686.
- o Minor features (unit tests):
- - Test complete bandwidth measurements files, and test that
- incomplete bandwidth lines only give warnings when the end of the
- header has not been detected. Fixes bug 25947; bugfix
- on 0.2.2.1-alpha
- o Minor bugfixes (compilation):
- - Refrain from compiling unit testing related object files when
- --disable-unittests is set to configure script. Fixes bug 24891;
- bugfix on 0.2.5.1-alpha.
- - When linking the libtor_testing.a library, only include the
- dirauth object files once. Previously, they were getting added
- twice. Fixes bug 26402; bugfix on 0.3.4.1-alpha.
- - The --enable-fatal-warnings flag now affects Rust code as well.
- Closes ticket 26245.
- o Minor bugfixes (onion services):
- - Recompute some consensus information after detecting a clock jump,
- or after transitioning from a non-live consensus to a live
- consensus. We do this to avoid having an outdated state, and
- miscalculating the index for next-generation onion services. Fixes
- bug 24977; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (relay):
- - Relays now correctly block attempts to re-extend to the previous
- relay by Ed25519 identity. Previously they would warn in this
- case, but not actually reject the attempt. Fixes bug 26158; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (testing):
- - Fix compilation of the doctests in the Rust crypto crate. Fixes
- bug 26415; bugfix on 0.3.4.1-alpha.
- - Instead of trying to read the geoip configuration files from
- within the unit tests, instead create our own ersatz files with
- just enough geoip data in the format we expect. Trying to read
- from the source directory created problems on Windows with mingw,
- where the build system's paths are not the same as the platform's
- paths. Fixes bug 25787; bugfix on 0.3.4.1-alpha.
- - Refrain from trying to get an item from an empty smartlist in
- test_bridges_clear_bridge_list. Set DEBUG_SMARTLIST in unit tests
- to catch improper smartlist usage. Furthermore, enable
- DEBUG_SMARTLIST globally when build is configured with fragile
- hardening. Fixes bug 26196; bugfix on 0.3.4.1-alpha.
- Changes in version 0.3.3.7 - 2018-06-12
- Tor 0.3.3.7 backports several changes from the 0.3.4.x series, including
- fixes for bugs affecting compatibility and stability.
- o Directory authority changes:
- - Add an IPv6 address for the "dannenberg" directory authority.
- Closes ticket 26343.
- o Minor features (geoip):
- - Update geoip and geoip6 to the June 7 2018 Maxmind GeoLite2
- Country database. Closes ticket 26351.
- o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
- - Work around a change in OpenSSL 1.1.1 where return values that
- would previously indicate "no password" now indicate an empty
- password. Without this workaround, Tor instances running with
- OpenSSL 1.1.1 would accept descriptors that other Tor instances
- would reject. Fixes bug 26116; bugfix on 0.2.5.16.
- o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
- - Silence unused-const-variable warnings in zstd.h with some GCC
- versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (controller, backport from 0.3.4.2-alpha):
- - Improve accuracy of the BUILDTIMEOUT_SET control port event's
- TIMEOUT_RATE and CLOSE_RATE fields. (We were previously
- miscounting the total number of circuits for these field values.)
- Fixes bug 26121; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
- - Prevent a possible out-of-bounds smartlist read in
- protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (path selection, backport from 0.3.4.1-alpha):
- - Only select relays when they have the descriptors we prefer to use
- for them. This change fixes a bug where we could select a relay
- because it had _some_ descriptor, but reject it later with a
- nonfatal assertion error because it didn't have the exact one we
- wanted. Fixes bugs 25691 and 25692; bugfix on 0.3.3.4-alpha.
- Changes in version 0.3.4.2-alpha - 2018-06-12
- Tor 0.3.4.2-alpha fixes several minor bugs in the previous alpha
- release, and forward-ports an authority-only security fix from 0.3.3.6.
- o Directory authority changes:
- - Add an IPv6 address for the "dannenberg" directory authority.
- Closes ticket 26343.
- o Major bugfixes (security, directory authority, denial-of-service, also in 0.3.3.6):
- - Fix a bug that could have allowed an attacker to force a directory
- authority to use up all its RAM by passing it a maliciously
- crafted protocol versions string. Fixes bug 25517; bugfix on
- 0.2.9.4-alpha. This issue is also tracked as TROVE-2018-005.
- o Minor features (continuous integration):
- - Add the necessary configuration files for continuous integration
- testing on Windows, via the Appveyor platform. Closes ticket
- 25549. Patches from Marcin Cieślak and Isis Lovecruft.
- o Minor features (geoip):
- - Update geoip and geoip6 to the June 7 2018 Maxmind GeoLite2
- Country database. Closes ticket 26351.
- o Minor bugfixes (compatibility, openssl):
- - Work around a change in OpenSSL 1.1.1 where return values that
- would previously indicate "no password" now indicate an empty
- password. Without this workaround, Tor instances running with
- OpenSSL 1.1.1 would accept descriptors that other Tor instances
- would reject. Fixes bug 26116; bugfix on 0.2.5.16.
- o Minor bugfixes (compilation):
- - Silence unused-const-variable warnings in zstd.h with some GCC
- versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
- - Fix compilation when using OpenSSL 1.1.0 with the "no-deprecated"
- flag enabled. Fixes bug 26156; bugfix on 0.3.4.1-alpha.
- - Avoid a compiler warning when casting the return value of
- smartlist_len() to double with DEBUG_SMARTLIST enabled. Fixes bug
- 26283; bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (control port):
- - Do not count 0-length RELAY_COMMAND_DATA cells as valid data in
- CIRC_BW events. Previously, such cells were counted entirely in
- the OVERHEAD field. Now they are not. Fixes bug 26259; bugfix
- on 0.3.4.1-alpha.
- o Minor bugfixes (controller):
- - Improve accuracy of the BUILDTIMEOUT_SET control port event's
- TIMEOUT_RATE and CLOSE_RATE fields. (We were previously
- miscounting the total number of circuits for these field values.)
- Fixes bug 26121; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (hardening):
- - Prevent a possible out-of-bounds smartlist read in
- protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (onion services):
- - Fix a bug that blocked the creation of ephemeral v3 onion
- services. Fixes bug 25939; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (test coverage tools):
- - Update our "cov-diff" script to handle output from the latest
- version of gcov, and to remove extraneous timestamp information
- from its output. Fixes bugs 26101 and 26102; bugfix
- on 0.2.5.1-alpha.
- Changes in version 0.3.3.6 - 2018-05-22
- Tor 0.3.3.6 is the first stable release in the 0.3.3 series. It
- backports several important fixes from the 0.3.4.1-alpha.
- The Tor 0.3.3 series includes controller support and other
- improvements for v3 onion services, official support for embedding Tor
- within other applications, and our first non-trivial module written in
- the Rust programming language. (Rust is still not enabled by default
- when building Tor.) And as usual, there are numerous other smaller
- bugfixes, features, and improvements.
- Below are the changes since 0.3.3.5-rc. For a list of all changes
- since 0.3.2.10, see the ReleaseNotes file.
- o Major bugfixes (directory authorities, security, backport from 0.3.4.1-alpha):
- - When directory authorities read a zero-byte bandwidth file, they
- would previously log a warning with the contents of an
- uninitialised buffer. They now log a warning about the empty file
- instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
- o Major bugfixes (security, directory authority, denial-of-service):
- - Fix a bug that could have allowed an attacker to force a directory
- authority to use up all its RAM by passing it a maliciously
- crafted protocol versions string. Fixes bug 25517; bugfix on
- 0.2.9.4-alpha. This issue is also tracked as TROVE-2018-005.
- o Major bugfixes (crash, backport from 0.3.4.1-alpha):
- - Avoid a rare assertion failure in the circuit build timeout code
- if we fail to allow any circuits to actually complete. Fixes bug
- 25733; bugfix on 0.2.2.2-alpha.
- o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
- - Avoid a crash when testing router reachability on a router that
- could have an ed25519 ID, but which does not. Fixes bug 25415;
- bugfix on 0.3.3.2-alpha.
- o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
- - Correctly detect when onion services get disabled after HUP. Fixes
- bug 25761; bugfix on 0.3.2.1.
- o Major bugfixes (relay, denial of service, backport from 0.3.4.1-alpha):
- - Impose a limit on circuit cell queue size. The limit can be
- controlled by a consensus parameter. Fixes bug 25226; bugfix
- on 0.2.4.14-alpha.
- o Minor features (compatibility, backport from 0.3.4.1-alpha):
- - Avoid some compilation warnings with recent versions of LibreSSL.
- Closes ticket 26006.
- o Minor features (continuous integration, backport from 0.3.4.1-alpha):
- - Our .travis.yml configuration now includes support for testing the
- results of "make distcheck". (It's not uncommon for "make check"
- to pass but "make distcheck" to fail.) Closes ticket 25814.
- - Our Travis CI configuration now integrates with the Coveralls
- coverage analysis tool. Closes ticket 25818.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 1 2018 Maxmind GeoLite2 Country
- database. Closes ticket 26104.
- o Minor bugfixes (client, backport from 0.3.4.1-alpha):
- - Don't consider Tor running as a client if the ControlPort is open,
- but no actual client ports are open. Fixes bug 26062; bugfix
- on 0.2.9.4-alpha.
- o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
- - Upon receiving a malformed connected cell, stop processing the
- cell immediately. Previously we would mark the connection for
- close, but continue processing the cell as if the connection were
- open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (documentation, backport from 0.3.4.1-alpha):
- - Stop saying in the manual that clients cache ipv4 dns answers from
- exit relays. We haven't used them since 0.2.6.3-alpha, and in
- ticket 24050 we stopped even caching them as of 0.3.2.6-alpha, but
- we forgot to say so in the man page. Fixes bug 26052; bugfix
- on 0.3.2.6-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
- - Allow the nanosleep() system call, which glibc uses to implement
- sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
- - Fix a memory leak when a v3 onion service is configured and gets a
- SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
- - When parsing the descriptor signature, look for the token plus an
- extra white-space at the end. This is more correct but also will
- allow us to support new fields that might start with "signature".
- Fixes bug 26069; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
- - Avoid a crash when running with DirPort set but ORPort tuned off.
- Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
- o Documentation (backport from 0.3.4.1-alpha):
- - Correct an IPv6 error in the documentation for ExitPolicy. Closes
- ticket 25857. Patch from "CTassisF".
- Changes in version 0.3.4.1-alpha - 2018-05-17
- Tor 0.3.4.1-alpha is the first release in the 0.3.4.x series. It
- includes refactoring to begin reducing Tor's binary size and idle CPU
- usage on mobile, along with prep work for new bandwidth scanners,
- improvements to the experimental "vanguards" feature, and numerous
- other small features and bugfixes.
- o New system requirements:
- - Tor no longer tries to support old operating systems without
- mmap() or some local equivalent. Apparently, compilation on such
- systems has been broken for some time, without anybody noticing or
- complaining. Closes ticket 25398.
- o Major feature (directory authority, modularization):
- - The directory authority subsystem has been modularized. The code
- is now located in src/or/dirauth/, and is compiled in by default.
- To disable the module, the configure option
- --disable-module-dirauth has been added. This module may be
- disabled by default in some future release. Closes ticket 25610.
- o Major features (main loop, CPU usage):
- - When Tor is disabled (via DisableNetwork or via hibernation), it
- no longer needs to run any per-second events. This change should
- make it easier for mobile applications to disable Tor while the
- device is sleeping, or Tor is not running. Closes ticket 26063.
- - Tor no longer enables all of its periodic events by default.
- Previously, Tor would enable all possible main loop events,
- regardless of whether it needed them. Furthermore, many of these
- events are now disabled with Tor is hibernating or DisableNetwork
- is set. This is a big step towards reducing client CPU usage by
- reducing the amount of wake-ups the daemon does. Closes ticket
- 25376 and 25762.
- - The bandwidth-limitation logic has been refactored so that
- bandwidth calculations are performed on-demand, rather than every
- TokenBucketRefillInterval milliseconds. This change should improve
- the granularity of our bandwidth calculations, and limit the
- number of times that the Tor process needs to wake up when it is
- idle. Closes ticket 25373.
- - Move responsibility for many operations from a once-per-second
- callback to a callback that is only scheduled as needed. Moving
- this functionality has allowed us to disable the callback when
- Tor's network is disabled. Once enough items are removed from our
- once-per-second callback, we can eliminate it entirely to conserve
- CPU when idle. The functionality removed includes: closing
- connections, circuits, and channels (ticket 25932); consensus
- voting (25937); flushing log callbacks (25951); honoring delayed
- SIGNEWNYM requests (25949); rescanning the consensus cache
- (25931); saving the state file to disk (25948); warning relay
- operators about unreachable ports (25952); and keeping track of
- Tor's uptime (26009).
- o Major bugfixes (directory authorities, security):
- - When directory authorities read a zero-byte bandwidth file, they
- would previously log a warning with the contents of an
- uninitialised buffer. They now log a warning about the empty file
- instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
- o Major bugfixes (crash):
- - Avoid a rare assertion failure in the circuit build timeout code
- if we fail to allow any circuits to actually complete. Fixes bug
- 25733; bugfix on 0.2.2.2-alpha.
- o Major bugfixes (directory authority):
- - Avoid a crash when testing router reachability on a router that
- could have an ed25519 ID, but which does not. Fixes bug 25415;
- bugfix on 0.3.3.2-alpha.
- o Major bugfixes (onion service):
- - Correctly detect when onion services get disabled after HUP. Fixes
- bug 25761; bugfix on 0.3.2.1.
- o Major bugfixes (protover, voting):
- - Revise Rust implementation of protover to use a more memory-
- efficient voting algorithm and corresponding data structures, thus
- avoiding a potential (but small impact) DoS attack where specially
- crafted protocol strings would expand to several potential
- megabytes in memory. In the process, several portions of code were
- revised to be methods on new, custom types, rather than functions
- taking interchangeable types, thus increasing type safety of the
- module. Custom error types and handling were added as well, in
- order to facilitate better error dismissal/handling in outside
- crates and avoid mistakenly passing an internal error string to C
- over the FFI boundary. Many tests were added, and some previous
- differences between the C and Rust implementations have been
- remedied. Fixes bug 24031; bugfix on 0.3.3.1-alpha.
- o Major bugfixes (relay, denial of service):
- - Impose a limit on circuit cell queue size. The limit can be
- controlled by a consensus parameter. Fixes bug 25226; bugfix
- on 0.2.4.14-alpha.
- o Minor features (accounting):
- - When Tor becomes dormant, it now uses a scheduled event to wake up
- at the right time. Previously, we would use the per-second timer
- to check whether to wake up, but we no longer have any per-second
- timers enabled when the network is disabled. Closes ticket 26064.
- o Minor features (code quality):
- - Add optional spell-checking for the Tor codebase, using the
- "misspell" program. To use this feature, run "make check-typos".
- Closes ticket 25024.
- o Minor features (compatibility):
- - Tor now detects versions of OpenSSL 1.1.0 and later compiled with
- the no-deprecated option, and builds correctly with them. Closes
- tickets 19429, 19981, and 25353.
- - Avoid some compilation warnings with recent versions of LibreSSL.
- Closes ticket 26006.
- o Minor features (compression, zstd):
- - When running with zstd, Tor now considers using advanced functions
- that the zstd maintainers have labeled as potentially unstable. To
- prevent breakage, Tor will only use this functionality when the
- runtime version of the zstd library matches the version with which
- Tor was compiled. Closes ticket 25162.
- o Minor features (configuration):
- - The "DownloadSchedule" options have been renamed to end with
- "DownloadInitialDelay". The old names are still allowed, but will
- produce a warning. Comma-separated lists are still permitted for
- these options, but all values after the first are ignored (as they
- have been since 0.2.9). Closes ticket 23354.
- o Minor features (continuous integration):
- - Our .travis.yml configuration now includes support for testing the
- results of "make distcheck". (It's not uncommon for "make check"
- to pass but "make distcheck" to fail.) Closes ticket 25814.
- - Our Travis CI configuration now integrates with the Coveralls
- coverage analysis tool. Closes ticket 25818.
- o Minor features (control port):
- - Introduce GETINFO "current-time/{local,utc}" to return the local
- and UTC times respectively in ISO format. This helps a controller
- like Tor Browser detect a time-related error. Closes ticket 25511.
- Patch by Neel Chauhan.
- - Introduce new fields to the CIRC_BW event. There are two new
- fields in each of the read and written directions. The DELIVERED
- fields report the total valid data on the circuit, as measured by
- the payload sizes of verified and error-checked relay command
- cells. The OVERHEAD fields report the total unused bytes in each
- of these cells. Closes ticket 25903.
- o Minor features (directory authority):
- - Directory authorities now open their key-pinning files as O_SYNC,
- to limit their chances of accidentally writing partial lines.
- Closes ticket 23909.
- o Minor features (directory authority, forward compatibility):
- - Make the lines of the measured bandwidth file able to contain
- their entries in any order. Previously, the node_id entry needed
- to come first. Closes ticket 26004.
- o Minor features (entry guards):
- - Introduce a new torrc option NumPrimaryGuards for controlling the
- number of primary guards. Closes ticket 25843.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 1 2018 Maxmind GeoLite2 Country
- database. Closes ticket 26104.
- o Minor features (performance):
- - Avoid a needless call to malloc() when processing an incoming
- relay cell. Closes ticket 24914.
- - Make our timing-wheel code run a tiny bit faster on 32-bit
- platforms, by preferring 32-bit math to 64-bit. Closes
- ticket 24688.
- - Avoid a needless malloc()/free() pair every time we handle an ntor
- handshake. Closes ticket 25150.
- o Minor features (testing):
- - Add a unit test for voting_schedule_get_start_of_next_interval().
- Closes ticket 26014, and helps make unit test coverage
- more deterministic.
- - A new unittests module specifically for testing the functions in
- the (new-ish) bridges.c module has been created with new
- unittests, raising the code coverage percentages. Closes 25425.
- - We now have improved testing for addressmap_get_virtual_address()
- function. This should improve our test coverage, and make our test
- coverage more deterministic. Closes ticket 25993.
- o Minor features (timekeeping, circuit scheduling):
- - When keeping track of how busy each circuit have been recently on
- a given connection, use coarse-grained monotonic timers rather
- than gettimeofday(). This change should marginally increase
- accuracy and performance. Implements part of ticket 25927.
- o Minor bugfixes (bandwidth management):
- - Consider ourselves "low on write bandwidth" if we have exhausted
- our write bandwidth some time in the last second. This was the
- documented behavior before, but the actual behavior was to change
- this value every TokenBucketRefillInterval. Fixes bug 25828;
- bugfix on 0.2.3.5-alpha.
- o Minor bugfixes (C correctness):
- - Add a missing lock acquisition in the shutdown code of the control
- subsystem. Fixes bug 25675; bugfix on 0.2.7.3-rc. Found by
- Coverity; this is CID 1433643.
- o Minor bugfixes (circuit path selection):
- - Don't count path selection failures as circuit build failures.
- This change should eliminate cases where Tor blames its guard or
- the network for situations like insufficient microdescriptors
- and/or overly restrictive torrc settings. Fixes bug 25705; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (client):
- - Don't consider Tor running as a client if the ControlPort is open,
- but no actual client ports are open. Fixes bug 26062; bugfix
- on 0.2.9.4-alpha.
- o Minor bugfixes (code style):
- - Fixed multiple includes of transports.h in src/or/connection.c
- Fixes bug 25261; bugfix on 0.2.5.1-alpha.
- - Remove the unused variable n_possible from the function
- channel_get_for_extend(). Fixes bug 25645; bugfix on 0.2.4.4-alpha
- o Minor bugfixes (control interface):
- - Respond with more human-readable error messages to GETINFO exit-
- policy/* requests. Also, let controller know if an error is
- transient (response code 551) or not (response code 552). Fixes
- bug 25852; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (controller):
- - Make CIRC_BW event reflect the total of all data sent on a
- circuit, including padding and dropped cells. Also fix a mis-
- counting bug when STREAM_BW events were enabled. Fixes bug 25400;
- bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (correctness, client):
- - Upon receiving a malformed connected cell, stop processing the cell
- immediately. Previously we would mark the connection for close, but
- continue processing the cell as if the connection were open. Fixes bug
- 26072; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (directory client):
- - When unverified-consensus is verified, rename it to cached-
- consenus. Fixes bug 4187; bugfix on 0.2.0.3-alpha.
- - Fixed launching a certificate fetch always during the scheduled
- periodic consensus fetch by fetching only in those cases when
- consensus are waiting for certs. Fixes bug 24740; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (documentation):
- - Stop saying in the manual that clients cache ipv4 dns answers from
- exit relays. We haven't used them since 0.2.6.3-alpha, and in
- ticket 24050 we stopped even caching them as of 0.3.2.6-alpha, but
- we forgot to say so in the man page. Fixes bug 26052; bugfix
- on 0.3.2.6-alpha.
- o Minor bugfixes (error reporting):
- - Improve tolerance for directory authorities with skewed clocks.
- Previously, an authority with a clock more than 60 seconds ahead
- could cause a client with a correct clock to warn that the
- client's clock was behind. Now the clocks of a majority of
- directory authorities have to be ahead of the client before this
- warning will occur. Fixes bug 25756; bugfix on 0.2.2.25-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Allow the nanosleep() system call, which glibc uses to implement
- sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (onion service):
- - Fix a memory leak when a v3 onion service is configured and gets a
- SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
- - When parsing the descriptor signature, look for the token plus an
- extra white-space at the end. This is more correct but also will
- allow us to support new fields that might start with "signature".
- Fixes bug 26069; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (path selection):
- - Only select relays when they have the descriptors we prefer to use
- for them. This change fixes a bug where we could select a relay
- because it had _some_ descriptor, but reject it later with a
- nonfatal assertion error because it didn't have the exact one we
- wanted. Fixes bugs 25691 and 25692; bugfix on 0.3.3.4-alpha.
- o Minor bugfixes (portability):
- - Do not align mmap length, as it is not required by POSIX, and the
- getpagesize function is deprecated. Fixes bug 25399; bugfix
- on 0.1.1.23.
- o Minor bugfixes (portability, FreeBSD):
- - In have_enough_mem_for_dircache(), the variable DIRCACHE_MIN_MEM_MB
- does not stringify on FreeBSD, so we switch to tor_asprintf().
- Fixes bug 20887; bugfix on 0.2.8.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (relay statistics):
- - When a relay is collecting internal statistics about how many
- create cell requests it has seen of each type, accurately count
- the requests from relays that temporarily fall out of the
- consensus. (To be extra conservative, we were already ignoring
- requests from clients in our counts, and we continue ignoring them
- here.) Fixes bug 24910; bugfix on 0.2.4.17-rc.
- o Minor bugfixes (relay, crash):
- - Avoid a crash when running with DirPort set but ORPort tuned off.
- Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (restart-in-process):
- - When shutting down, Tor now clears all the flags in the control.c
- module. This should prevent a bug where authentication cookies are
- not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (testing):
- - When testing workqueue event-cancellation, make sure that we
- actually cancel an event, and that cancel each event with equal
- probability. (It was previously possible, though extremely
- unlikely, for our event-canceling test not to cancel any events.)
- Fixes bug 26008; bugfix on 0.2.6.3-alpha.
- - Repeat part of the test in test_client_pick_intro() a number of
- times, to give it consistent coverage. Fixes bug 25996; bugfix
- on 0.3.2.1-alpha.
- - Remove randomness from the hs_common/responsible_hsdirs test, so
- that it always takes the same path through the function it tests.
- Fixes bug 25997; bugfix on 0.3.2.1-alpha.
- - Change the behavior of the "channel/outbound" test so that it
- never causes a 10-second rollover for the EWMA circuitmux code.
- Previously, this behavior would happen randomly, and result in
- fluctuating test coverage. Fixes bug 25994; bugfix
- on 0.3.3.1-alpha.
- - Use X509_new() to allocate certificates that will be freed later
- with X509_free(). Previously, some parts of the unit tests had
- used tor_malloc_zero(), which is incorrect, and which caused test
- failures on Windows when they were built with extra hardening.
- Fixes bugs 25943 and 25944; bugfix on 0.2.8.1-alpha. Patch by
- Marcin Cieślak.
- - While running the circuit_timeout test, fix the PRNG to a
- deterministic AES stream, so that the test coverage from this test
- will itself be deterministic. Fixes bug 25995; bugfix
- on 0.2.2.2-alpha.
- o Minor bugfixes (vanguards):
- - Allow the last hop in a vanguard circuit to be the same as our
- first, to prevent the adversary from influencing guard node choice
- by choice of last hop. Also prevent the creation of A - B - A
- paths, or A - A paths, which are forbidden by relays. Fixes bug
- 25870; bugfix on 0.3.3.1-alpha.
- o Code simplification and refactoring:
- - Remove duplicate code in parse_{c,s}method_line and bootstrap
- their functionalities into a single function. Fixes bug 6236;
- bugfix on 0.2.3.6-alpha.
- - We remove the PortForwsrding and PortForwardingHelper options,
- related functions, and the port_forwarding tests. These options
- were used by the now-deprecated Vidalia to help ordinary users
- become Tor relays or bridges. Closes ticket 25409. Patch by
- Neel Chauhan.
- - In order to make the OR and dir checking function in router.c less
- confusing we renamed some functions and
- consider_testing_reachability() has been split into
- router_should_check_reachability() and
- router_do_reachability_checks(). Also we improved the documentation
- in some functions. Closes ticket 18918.
- - Initial work to isolate Libevent usage to a handful of modules in
- our codebase, to simplify our call structure, and so that we can
- more easily change event loops in the future if needed. Closes
- ticket 23750.
- - Introduce a function to call getsockname() and return tor_addr_t,
- to save a little complexity throughout the codebase. Closes
- ticket 18105.
- - Make hsdir_index in node_t a hsdir_index_t rather than a pointer
- as hsdir_index is always present. Also, we move hsdir_index_t into
- or.h. Closes ticket 23094. Patch by Neel Chauhan.
- - Merge functions used for describing nodes and suppress the
- functions that do not allocate memory for the output buffer
- string. NODE_DESC_BUF_LEN constant and format_node_description()
- function cannot be used externally from router.c module anymore.
- Closes ticket 25432. Patch by valentecaio.
- - Our main loop has been simplified so that all important operations
- happen inside events. Previously, some operations had to happen
- outside the event loop, to prevent infinite sequences of event
- activations. Closes ticket 25374.
- - Put a SHA1 public key digest in hs_service_intro_point_t, and use
- it in register_intro_circ() and service_intro_point_new(). This
- prevents the digest from being re-calculated each time. Closes
- ticket 23107. Patch by Neel Chauhan.
- - Refactor token-bucket implementations to use a common backend.
- Closes ticket 25766.
- - Remove extern declaration of stats_n_seconds_working variable from
- main, protecting its accesses with get_uptime() and reset_uptime()
- functions. Closes ticket 25081, patch by “valentecaio”.
- - Remove our previous logic for "cached gettimeofday()" -- our
- coarse monotonic timers are fast enough for this purpose, and far
- less error-prone. Implements part of ticket 25927.
- - Remove the return value for fascist_firewall_choose_address_base(),
- and sister functions such as fascist_firewall_choose_address_node()
- and fascist_firewall_choose_address_rs(). Also, while we're here,
- initialize the ap argument as leaving it uninitialized can pose a
- security hazard. Closes ticket 24734. Patch by Neel Chauhan.
- - Rename two fields of connection_t struct. timestamp_lastwritten is
- renamed to timestamp_last_write_allowed and timestamp_lastread is
- renamed to timestamp_last_read_allowed. Closes ticket 24714, patch
- by "valentecaio".
- - Since Tor requires C99, remove our old workaround code for libc
- implementations where free(NULL) doesn't work. Closes ticket 24484.
- - Use our standard rate-limiting code to deal with excessive
- libevent failures, rather than the hand-rolled logic we had
- before. Closes ticket 26016.
- - We remove the return value of node_get_prim_orport() and
- node_get_prim_dirport(), and introduce node_get_prim_orport() in
- node_ipv6_or_preferred() and node_ipv6_dir_preferred() in order to
- check for a null address. Closes ticket 23873. Patch by
- Neel Chauhan.
- - We switch to should_record_bridge_info() in
- geoip_note_client_seen() and options_need_geoip_info() instead of
- accessing the configuration values directly. Fixes bug 25290;
- bugfix on 0.2.1.6-alpha. Patch by Neel Chauhan.
- o Deprecated features:
- - As we are not recommending 0.2.5 anymore, we require relays that
- once had an ed25519 key associated with their RSA key to always
- have that key, instead of allowing them to drop back to a version
- that didn't support ed25519. This means they need to use a new RSA
- key if the want to downgrade to an older version of tor without
- ed25519. Closes ticket 20522.
- o Documentation:
- - Correct an IPv6 error in the documentation for ExitPolicy. Closes
- ticket 25857. Patch from "CTassisF".
- o Removed features:
- - Directory authorities will no longer support voting according to
- any consensus method before consensus method 25. This keeps
- authorities compatible with all authorities running 0.2.9.8 and
- later, and does not break any clients or relays. Implements ticket
- 24378 and proposal 290.
- - The PortForwarding and PortForwardingHelper features have been
- removed. The reasoning is, given that implementations of NAT
- traversal protocols within common consumer grade routers are
- frequently buggy, and that the target audience for a NAT punching
- feature is a perhaps less-technically-inclined relay operator,
- when the helper fails to setup traversal the problems are usually
- deep, ugly, and very router specific, making them horrendously
- impossible for technical support to reliable assist with, and thus
- resulting in frustration all around. Unfortunately, relay
- operators who would like to run relays behind NATs will need to
- become more familiar with the port forwarding configurations on
- their local router. Closes 25409.
- - The TestingEnableTbEmptyEvent option has been removed. It was used
- in testing simulations to measure how often connection buckets
- were emptied, in order to improve our scheduling, but it has not
- been actively used in years. Closes ticket 25760.
- - The old "round-robin" circuit multiplexer (circuitmux)
- implementation has been removed, along with a fairly large set of
- code that existed to support it. It has not been the default
- circuitmux since we introduced the "EWMA" circuitmux in 0.2.4.x,
- but it still required an unreasonable amount of memory and CPU.
- Closes ticket 25268.
- Changes in version 0.3.3.5-rc - 2018-04-15
- Tor 0.3.3.5-rc fixes various bugs in earlier versions of Tor,
- including some that could affect reliability or correctness.
- This is the first release candidate in the 0.3.3 series. If we find no
- new bugs or regression here, then the first stable 0.3.3 release will
- be nearly identical to this one.
- o Major bugfixes (security, protover, voting):
- - Revise Rust implementation of protover to use a more memory-
- efficient voting algorithm and corresponding data structures, thus
- avoiding a potential memory-based DoS attack where specially
- crafted protocol strings would expand to fill available memory.
- Fixes bug 24031; bugfix on 0.3.3.1-alpha.
- o Major bugfixes (performance, load balancing):
- - Directory authorities no longer vote in favor of the Guard flag
- for relays without directory support. Starting in Tor
- 0.3.0.1-alpha, clients have been avoiding using such relays in the
- Guard position, leading to increasingly broken load balancing for
- the 5%-or-so of Guards that don't advertise directory support.
- Fixes bug 22310; bugfix on 0.3.0.6.
- o Minor feature (continuous integration):
- - Update the Travis CI configuration to use the stable Rust channel,
- now that we have decided to require that. Closes ticket 25714.
- o Minor features (config options):
- - Change the way the default value for MaxMemInQueues is calculated.
- We now use 40% of the hardware RAM if the system has 8 GB RAM or
- more. Otherwise we use the former value of 75%. Closes
- ticket 24782.
- o Minor features (geoip):
- - Update geoip and geoip6 to the April 3 2018 Maxmind GeoLite2
- Country database. Closes ticket 25718.
- o Minor bugfixes (client):
- - When using a listed relay as a bridge, and also using
- microdescriptors, and considering that relay as a non-bridge in a
- circuit, treat its microdescriptor as a valid source of
- information about that relay. This change should prevent a non-
- fatal assertion error. Fixes bug 25691; bugfix on 0.3.3.4-alpha.
- o Minor bugfixes (controller):
- - Restore the correct operation of the RESOLVE command, which had
- been broken since we added the ability to enable/disable DNS on
- specific listener ports. Fixes bug 25617; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (distribution, compilation, rust):
- - Build correctly when the rust dependencies submodule is loaded,
- but the TOR_RUST_DEPENDENCIES environment variable is not set.
- Fixes bug 25679; bugfix on 0.3.3.1-alpha.
- - Actually include all of our Rust source in our source
- distributions. (Previously, a few of the files were accidentally
- omitted.) Fixes bug 25732; bugfix on 0.3.3.2-alpha.
- o Minor bugfixes (documentation):
- - Document that the PerConnBW{Rate,Burst} options will fall back to
- their corresponding consensus parameters only if those parameters
- are set. Previously we had claimed that these values would always
- be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
- - Revert a misformatting issue in the ExitPolicy documentation.
- Fixes bug 25582; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (exit relay DNS retries):
- - Re-attempt timed-out DNS queries 3 times before failure, since our
- timeout is 5 seconds for them, but clients wait 10-15. Also allow
- slightly more timeouts per resolver when an exit has multiple
- resolvers configured. Fixes bug 21394; bugfix on 0.3.1.9.
- o Minor bugfixes (onion services):
- - Re-instate counting the client HSDir fetch circuits against the
- MaxClientCircuitsPending rate limit. Fixes bug 24989; bugfix
- on 0.3.3.1-alpha.
- - Remove underscores from the _HSLayer{2,3}Nodes options. This
- expert-user configuration can now be enabled as HSLayer{2,3}Nodes.
- Fixes bug 25581; bugfix on 0.3.3.1-alpha
- o Code simplification and refactoring:
- - Move the list of default directory authorities to its own file.
- Closes ticket 24854. Patch by "beastr0".
- o Documentation (manpage, denial of service):
- - Provide more detail about the denial-of-service options, by
- listing each mitigation and explaining how they relate. Closes
- ticket 25248.
- Changes in version 0.3.3.4-alpha - 2018-03-29
- Tor 0.3.3.4-alpha includes various bugfixes for issues found during
- the alpha testing of earlier releases in its series. We are
- approaching a stable 0.3.3.4-alpha release: more testing is welcome!
- o New system requirements:
- - When built with Rust, Tor now depends on version 0.2.39 of the
- libc crate. Closes tickets 25310 and 25664.
- o Major bugfixes (relay, connection):
- - If we have failed to connect to a relay and received a connection
- refused, timeout, or similar error (at the TCP level), do not try
- that same address/port again for 60 seconds after the failure has
- occurred. Fixes bug 24767; bugfix on 0.0.6.
- o Minor features (geoip):
- - Update geoip and geoip6 to the March 8 2018 Maxmind GeoLite2
- Country database. Closes ticket 25469.
- o Minor features (log messages):
- - Improve log message in the out-of-memory handler to include
- information about memory usage from the different compression
- backends. Closes ticket 25372.
- o Minor features (sandbox):
- - Explicitly permit the poll() system call when the Linux
- seccomp2-based sandbox is enabled: apparently, some versions of
- libc use poll() when calling getpwnam(). Closes ticket 25313.
- o Minor bugfixes (C correctness):
- - Fix a very unlikely (impossible, we believe) null pointer
- dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
- Coverity; this is CID 1430932.
- o Minor bugfixes (channel, client):
- - Better identify client connection when reporting to the geoip
- client cache. Fixes bug 24904; bugfix on 0.3.1.7.
- o Minor bugfixes (compilation):
- - Fix a C99 compliance issue in our configuration script that caused
- compilation issues when compiling Tor with certain versions of
- xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
- o Minor bugfixes (controller, reliability):
- - Avoid a (nonfatal) assertion failure when extending a one-hop
- circuit from the controller to become a multihop circuit. Fixes
- bug 24903; bugfix on 0.2.5.2-alpha.
- o Major bugfixes (networking):
- - Tor will no longer reject IPv6 address strings from Tor Browser
- when they are passed as hostnames in SOCKS5 requests. Fixes bug
- 25036, bugfix on Tor 0.3.1.2.
- o Minor bugfixes (networking):
- - string_is_valid_hostname() will not consider IP strings to be
- valid hostnames. Fixes bug 25055; bugfix on Tor 0.2.5.5.
- o Minor bugfixes (onion service v3):
- - Avoid an assertion failure when the next onion service
- descriptor rotation type is out of sync with the consensus's
- valid-after time. Instead, log a warning message with extra
- information, so we can better hunt down the cause of this
- assertion. Fixes bug 25306; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (testing):
- - Avoid intermittent test failures due to a test that had relied on
- onion service introduction point creation finishing within 5
- seconds of real clock time. Fixes bug 25450; bugfix
- on 0.3.1.3-alpha.
- - Rust crates are now automatically detected and tested. Previously,
- some crates were not tested by `make test-rust` due to a static
- string in the `src/test/test_rust.sh` script specifying which
- crates to test. Fixes bug 25560; bugfix on 0.3.3.3-alpha.
- o Minor bugfixes (testing, benchmarks):
- - Fix a crash when running benchmark tests on win32 systems. The
- crash was due to a mutex that wasn't initialized before logging
- and options were initialized. Fixes bug 25479; bugfix
- on 0.3.3.3-alpha.
- o Minor bugfixes (warnings, ipv6):
- - Avoid a bug warning that could occur when trying to connect to a
- relay over IPv6. This warning would occur on a Tor instance that
- downloads router descriptors, but prefers to use microdescriptors.
- Fixes bug 25213; bugfix on 0.3.3.1-alpha.
- o Code simplification and refactoring:
- - Remove the old (deterministic) directory retry logic entirely:
- We've used exponential backoff exclusively for some time. Closes
- ticket 23814.
- o Documentation:
- - Improved the documentation of AccountingStart parameter. Closes
- ticket 23635.
- - Update the documentation for "Log" to include the current list of
- logging domains. Closes ticket 25378.
- Changes in version 0.3.1.10 - 2018-03-03
- Tor 0.3.1.10 backports a number of bugfixes, including important fixes for
- security issues.
- It includes an important security fix for a remote crash attack
- against directory authorities, tracked as TROVE-2018-001.
- This release also backports our new system for improved resistance to
- denial-of-service attacks against relays.
- This release also fixes several minor bugs and annoyances from
- earlier releases.
- All directory authorities should upgrade to one of the versions
- released today. Relays running 0.3.1.x may wish to update to one of
- the versions released today, for the DoS mitigations.
- Please note: according to our release calendar, Tor 0.3.1 will no
- longer be supported after 1 July 2018. If you will be running Tor
- after that date, you should make sure to plan to upgrade to the latest
- stable version, or downgrade to 0.2.9 (which will receive long-term
- support).
- o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- - Fix a protocol-list handling bug that could be used to remotely crash
- directory authorities with a null-pointer exception. Fixes bug 25074;
- bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
- CVE-2018-0490.
- o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
- - Give relays some defenses against the recent network overload. We
- start with three defenses (default parameters in parentheses).
- First: if a single client address makes too many concurrent
- connections (>100), hang up on further connections. Second: if a
- single client address makes circuits too quickly (more than 3 per
- second, with an allowed burst of 90) while also having too many
- connections open (3), refuse new create cells for the next while
- (1-2 hours). Third: if a client asks to establish a rendezvous
- point to you directly, ignore the request. These defenses can be
- manually controlled by new torrc options, but relays will also
- take guidance from consensus parameters, so there's no need to
- configure anything manually. Implements ticket 24902.
- o Minor features (linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
- - Update the sandbox rules so that they should now work correctly
- with Glibc 2.26. Closes ticket 24315.
- o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
- - Fix an "off by 2" error in counting rendezvous failures on the
- onion service side. While we thought we would stop the rendezvous
- attempt after one failed circuit, we were actually making three
- circuit attempts before giving up. Now switch to a default of 2,
- and allow the consensus parameter "hs_service_max_rdv_failures" to
- override. Fixes bug 24895; bugfix on 0.0.6.
- o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
- - Add Link protocol version 5 to the supported protocols list. Fixes
- bug 25070; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (relay, backport from 0.3.3.1-alpha):
- - Fix a set of false positives where relays would consider
- connections to other relays as being client-only connections (and
- thus e.g. deserving different link padding schemes) if those
- relays fell out of the consensus briefly. Now we look only at the
- initial handshake and whether the connection authenticated as a
- relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
- o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
- - Make our OOM handler aware of the geoip client history cache so it
- doesn't fill up the memory. This check is important for IPv6 and
- our DoS mitigation subsystem. Closes ticket 25122.
- o Minor feature (relay statistics, backport from 0.3.2.6-alpha):
- - Change relay bandwidth reporting stats interval from 4 hours to 24
- hours in order to reduce the efficiency of guard discovery
- attacks. Fixes ticket 23856.
- o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
- - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
- Previous versions of Tor would not have worked with OpenSSL 1.1.1,
- since they neither disabled TLS 1.3 nor enabled any of the
- ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
- Closes ticket 24978.
- o Minor features (fallback directory mirrors, backport from 0.3.2.9):
- - The fallback directory list has been re-generated based on the
- current status of the network. Tor uses fallback directories to
- bootstrap when it doesn't yet have up-to-date directory
- information. Closes ticket 24801.
- - Make the default DirAuthorityFallbackRate 0.1, so that clients
- prefer to bootstrap from fallback directory mirrors. This is a
- follow-up to 24679, which removed weights from the default
- fallbacks. Implements ticket 24681.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
- Country database.
- o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
- - Use the actual observed address of an incoming relay connection,
- not the canonical address of the relay from its descriptor, when
- making decisions about how to handle the incoming connection.
- Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
- o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
- - Directory authorities, when refusing a descriptor from a rejected
- relay, now explicitly tell the relay (in its logs) to set a valid
- ContactInfo address and contact the bad-relays@ mailing list.
- Fixes bug 25170; bugfix on 0.2.9.1.
- o Minor bugfixes (address selection, backport from 0.3.2.9):
- - When the fascist_firewall_choose_address_ functions don't find a
- reachable address, set the returned address to the null address
- and port. This is a precautionary measure, because some callers do
- not check the return value. Fixes bug 24736; bugfix
- on 0.2.8.2-alpha.
- o Major bugfixes (bootstrapping, backport from 0.3.2.5-alpha):
- - Fetch descriptors aggressively whenever we lack enough to build
- circuits, regardless of how many descriptors we are missing.
- Previously, we would delay launching the fetch when we had fewer
- than 15 missing descriptors, even if some of those descriptors
- were blocking circuits from building. Fixes bug 23985; bugfix on
- 0.1.1.11-alpha. The effects of this bug became worse in
- 0.3.0.3-alpha, when we began treating missing descriptors from our
- primary guards as a reason to delay circuits.
- - Don't try fetching microdescriptors from relays that have failed
- to deliver them in the past. Fixes bug 23817; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.2.7-rc):
- - Fix a signed/unsigned comparison warning introduced by our fix to
- TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
- o Minor bugfixes (control port, linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
- - Avoid a crash when attempting to use the seccomp2 sandbox together
- with the OwningControllerProcess feature. Fixes bug 24198; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- - Fix a possible crash on malformed consensus. If a consensus had
- contained an unparseable protocol line, it could have made clients
- and relays crash with a null-pointer exception. To exploit this
- issue, however, an attacker would need to be able to subvert the
- directory authority system. Fixes bug 25251; bugfix on
- 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
- o Minor bugfixes (directory cache, backport from 0.3.2.5-alpha):
- - Recover better from empty or corrupt files in the consensus cache
- directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
- - When a consensus diff calculation is only partially successful,
- only record the successful parts as having succeeded. Partial
- success can happen if (for example) one compression method fails
- but the others succeed. Previously we misrecorded all the
- calculations as having succeeded, which would later cause a
- nonfatal assertion failure. Fixes bug 24086; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (entry guards, backport from 0.3.2.3-alpha):
- - Tor now updates its guard state when it reads a consensus
- regardless of whether it's missing descriptors. That makes tor use
- its primary guards to fetch descriptors in some edge cases where
- it would previously have used fallback directories. Fixes bug
- 23862; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
- - Don't treat inability to store a cached consensus object as a bug:
- it can happen normally when we are out of disk space. Fixes bug
- 24859; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (memory usage, backport from 0.3.2.8-rc):
- - When queuing DESTROY cells on a channel, only queue the circuit-id
- and reason fields: not the entire 514-byte cell. This fix should
- help mitigate any bugs or attacks that fill up these queues, and
- free more RAM for other uses. Fixes bug 24666; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (network layer, backport from 0.3.2.5-alpha):
- - When closing a connection via close_connection_immediately(), we
- mark it as "not blocked on bandwidth", to prevent later calls from
- trying to unblock it, and give it permission to read. This fixes a
- backtrace warning that can happen on relays under various
- circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (path selection, backport from 0.3.2.4-alpha):
- - When selecting relays by bandwidth, avoid a rounding error that
- could sometimes cause load to be imbalanced incorrectly.
- Previously, we would always round upwards; now, we round towards
- the nearest integer. This had the biggest effect when a relay's
- weight adjustments should have given it weight 0, but it got
- weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- - When calculating the fraction of nodes that have descriptors, and
- all nodes in the network have zero bandwidths, count the number of
- nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- - Actually log the total bandwidth in compute_weighted_bandwidths().
- Fixes bug 24170; bugfix on 0.2.4.3-alpha.
- o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
- - Improve the performance of our consensus-diff application code
- when Tor is built with the --enable-fragile-hardening option set.
- Fixes bug 24826; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
- - Don't exit the Tor process if setrlimit() fails to change the file
- limit (which can happen sometimes on some versions of OSX). Fixes
- bug 21074; bugfix on 0.0.9pre5.
- o Minor bugfixes (portability, msvc, backport from 0.3.2.9):
- - Fix a bug in the bit-counting parts of our timing-wheel code on
- MSVC. (Note that MSVC is still not a supported build platform, due
- to cyptographic timing channel risks.) Fixes bug 24633; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (relay, partial backport):
- - Make the internal channel_is_client() function look at what sort
- of connection handshake the other side used, rather than whether
- the other side ever sent a create_fast cell to us. Backports part
- of the fixes from bugs 22805 and 24898.
- o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
- 0.2.9.4-alpha.
- - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
- bugfix on 0.2.9.4-alpha.
- o Code simplification and refactoring (backport from 0.3.3.3-alpha):
- - Update the "rust dependencies" submodule to be a project-level
- repository, rather than a user repository. Closes ticket 25323.
- Changes in version 0.2.9.15 - 2018-03-03
- Tor 0.2.9.15 backports important security and stability bugfixes from
- later Tor releases.
- It includes an important security fix for a remote crash attack
- against directory authorities, tracked as TROVE-2018-001.
- This release also backports our new system for improved resistance to
- denial-of-service attacks against relays.
- This release also fixes several minor bugs and annoyances from
- earlier releases.
- All directory authorities should upgrade to one of the versions
- released today. Relays running 0.2.9.x may wish to update to one of
- the versions released today, for the DoS mitigations.
- o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- - Fix a protocol-list handling bug that could be used to remotely crash
- directory authorities with a null-pointer exception. Fixes bug 25074;
- bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
- CVE-2018-0490.
- o Major features (denial-of-service mitigation):
- - Give relays some defenses against the recent network overload. We
- start with three defenses (default parameters in parentheses).
- First: if a single client address makes too many concurrent
- connections (>100), hang up on further connections. Second: if a
- single client address makes circuits too quickly (more than 3 per
- second, with an allowed burst of 90) while also having too many
- connections open (3), refuse new create cells for the next while
- (1-2 hours). Third: if a client asks to establish a rendezvous
- point to you directly, ignore the request. These defenses can be
- manually controlled by new torrc options, but relays will also
- take guidance from consensus parameters, so there's no need to
- configure anything manually. Implements ticket 24902.
- o Major bugfixes (bootstrapping):
- - Fetch descriptors aggressively whenever we lack enough to build
- circuits, regardless of how many descriptors we are missing.
- Previously, we would delay launching the fetch when we had fewer
- than 15 missing descriptors, even if some of those descriptors
- were blocking circuits from building. Fixes bug 23985; bugfix on
- 0.1.1.11-alpha. The effects of this bug became worse in
- 0.3.0.3-alpha, when we began treating missing descriptors from our
- primary guards as a reason to delay circuits.
- o Major bugfixes (onion services, retry behavior):
- - Fix an "off by 2" error in counting rendezvous failures on the
- onion service side. While we thought we would stop the rendezvous
- attempt after one failed circuit, we were actually making three
- circuit attempts before giving up. Now switch to a default of 2,
- and allow the consensus parameter "hs_service_max_rdv_failures" to
- override. Fixes bug 24895; bugfix on 0.0.6.
- o Minor feature (relay statistics):
- - Change relay bandwidth reporting stats interval from 4 hours to 24
- hours in order to reduce the efficiency of guard discovery
- attacks. Fixes ticket 23856.
- o Minor features (compatibility, OpenSSL):
- - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
- Previous versions of Tor would not have worked with OpenSSL 1.1.1,
- since they neither disabled TLS 1.3 nor enabled any of the
- ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
- Closes ticket 24978.
- o Minor features (denial-of-service avoidance):
- - Make our OOM handler aware of the geoip client history cache so it
- doesn't fill up the memory. This check is important for IPv6 and
- our DoS mitigation subsystem. Closes ticket 25122.
- o Minor features (fallback directory mirrors):
- - The fallback directory list has been re-generated based on the
- current status of the network. Tor uses fallback directories to
- bootstrap when it doesn't yet have up-to-date directory
- information. Closes ticket 24801.
- - Make the default DirAuthorityFallbackRate 0.1, so that clients
- prefer to bootstrap from fallback directory mirrors. This is a
- follow-up to 24679, which removed weights from the default
- fallbacks. Implements ticket 24681.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
- Country database.
- o Minor features (linux seccomp2 sandbox):
- - Update the sandbox rules so that they should now work correctly
- with Glibc 2.26. Closes ticket 24315.
- o Minor bugfix (channel connection):
- - Use the actual observed address of an incoming relay connection,
- not the canonical address of the relay from its descriptor, when
- making decisions about how to handle the incoming connection.
- Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
- o Minor bugfix (directory authority):
- - Directory authorities, when refusing a descriptor from a rejected
- relay, now explicitly tell the relay (in its logs) to set a valid
- ContactInfo address and contact the bad-relays@ mailing list.
- Fixes bug 25170; bugfix on 0.2.9.1.
- o Minor bugfixes (address selection):
- - When the fascist_firewall_choose_address_ functions don't find a
- reachable address, set the returned address to the null address
- and port. This is a precautionary measure, because some callers do
- not check the return value. Fixes bug 24736; bugfix
- on 0.2.8.2-alpha.
- o Minor bugfixes (compilation):
- - Fix a signed/unsigned comparison warning introduced by our fix to
- TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
- o Minor bugfixes (control port, linux seccomp2 sandbox):
- - Avoid a crash when attempting to use the seccomp2 sandbox together
- with the OwningControllerProcess feature. Fixes bug 24198; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- - Fix a possible crash on malformed consensus. If a consensus had
- contained an unparseable protocol line, it could have made clients
- and relays crash with a null-pointer exception. To exploit this
- issue, however, an attacker would need to be able to subvert the
- directory authority system. Fixes bug 25251; bugfix on
- 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
- o Minor bugfixes (memory usage):
- - When queuing DESTROY cells on a channel, only queue the circuit-id
- and reason fields: not the entire 514-byte cell. This fix should
- help mitigate any bugs or attacks that fill up these queues, and
- free more RAM for other uses. Fixes bug 24666; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (network layer):
- - When closing a connection via close_connection_immediately(), we
- mark it as "not blocked on bandwidth", to prevent later calls from
- trying to unblock it, and give it permission to read. This fixes a
- backtrace warning that can happen on relays under various
- circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (OSX):
- - Don't exit the Tor process if setrlimit() fails to change the file
- limit (which can happen sometimes on some versions of OSX). Fixes
- bug 21074; bugfix on 0.0.9pre5.
- o Minor bugfixes (path selection):
- - When selecting relays by bandwidth, avoid a rounding error that
- could sometimes cause load to be imbalanced incorrectly.
- Previously, we would always round upwards; now, we round towards
- the nearest integer. This had the biggest effect when a relay's
- weight adjustments should have given it weight 0, but it got
- weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- - When calculating the fraction of nodes that have descriptors, and
- all nodes in the network have zero bandwidths, count the number of
- nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- - Actually log the total bandwidth in compute_weighted_bandwidths().
- Fixes bug 24170; bugfix on 0.2.4.3-alpha.
- o Minor bugfixes (portability, msvc):
- - Fix a bug in the bit-counting parts of our timing-wheel code on
- MSVC. (Note that MSVC is still not a supported build platform, due
- to cryptographic timing channel risks.) Fixes bug 24633; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (relay):
- - Make the internal channel_is_client() function look at what sort
- of connection handshake the other side used, rather than whether
- the other side ever sent a create_fast cell to us. Backports part
- of the fixes from bugs 22805 and 24898.
- o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
- 0.2.9.4-alpha.
- - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
- bugfix on 0.2.9.4-alpha.
- Changes in version 0.3.2.10 - 2018-03-03
- Tor 0.3.2.10 is the second stable release in the 0.3.2 series. It
- backports a number of bugfixes, including important fixes for security
- issues.
- It includes an important security fix for a remote crash attack
- against directory authorities, tracked as TROVE-2018-001.
- Additionally, it backports a fix for a bug whose severity we have
- upgraded: Bug 24700, which was fixed in 0.3.3.2-alpha, can be remotely
- triggered in order to crash relays with a use-after-free pattern. As
- such, we are now tracking that bug as TROVE-2018-002 and
- CVE-2018-0491, and backporting it to earlier releases. This bug
- affected versions 0.3.2.1-alpha through 0.3.2.9, as well as version
- 0.3.3.1-alpha.
- This release also backports our new system for improved resistance to
- denial-of-service attacks against relays.
- This release also fixes several minor bugs and annoyances from
- earlier releases.
- Relays running 0.3.2.x SHOULD upgrade to one of the versions released
- today, for the fix to TROVE-2018-002. Directory authorities should
- also upgrade. (Relays on earlier versions might want to update too for
- the DoS mitigations.)
- o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- - Fix a protocol-list handling bug that could be used to remotely crash
- directory authorities with a null-pointer exception. Fixes bug 25074;
- bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
- CVE-2018-0490.
- o Major bugfixes (scheduler, KIST, denial-of-service, backport from 0.3.3.2-alpha):
- - Avoid adding the same channel twice in the KIST scheduler pending
- list, which could lead to remote denial-of-service use-after-free
- attacks against relays. Fixes bug 24700; bugfix on 0.3.2.1-alpha.
- o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
- - Give relays some defenses against the recent network overload. We
- start with three defenses (default parameters in parentheses).
- First: if a single client address makes too many concurrent
- connections (>100), hang up on further connections. Second: if a
- single client address makes circuits too quickly (more than 3 per
- second, with an allowed burst of 90) while also having too many
- connections open (3), refuse new create cells for the next while
- (1-2 hours). Third: if a client asks to establish a rendezvous
- point to you directly, ignore the request. These defenses can be
- manually controlled by new torrc options, but relays will also
- take guidance from consensus parameters, so there's no need to
- configure anything manually. Implements ticket 24902.
- o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
- - Fix an "off by 2" error in counting rendezvous failures on the
- onion service side. While we thought we would stop the rendezvous
- attempt after one failed circuit, we were actually making three
- circuit attempts before giving up. Now switch to a default of 2,
- and allow the consensus parameter "hs_service_max_rdv_failures" to
- override. Fixes bug 24895; bugfix on 0.0.6.
- - New-style (v3) onion services now obey the "max rendezvous circuit
- attempts" logic. Previously they would make as many rendezvous
- circuit attempts as they could fit in the MAX_REND_TIMEOUT second
- window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
- o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
- - Add Link protocol version 5 to the supported protocols list. Fixes
- bug 25070; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (relay, backport from 0.3.3.1-alpha):
- - Fix a set of false positives where relays would consider
- connections to other relays as being client-only connections (and
- thus e.g. deserving different link padding schemes) if those
- relays fell out of the consensus briefly. Now we look only at the
- initial handshake and whether the connection authenticated as a
- relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (scheduler, consensus, backport from 0.3.3.2-alpha):
- - The scheduler subsystem was failing to promptly notice changes in
- consensus parameters, making it harder to switch schedulers
- network-wide. Fixes bug 24975; bugfix on 0.3.2.1-alpha.
- o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
- - Make our OOM handler aware of the geoip client history cache so it
- doesn't fill up the memory. This check is important for IPv6 and
- our DoS mitigation subsystem. Closes ticket 25122.
- o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
- - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
- Previous versions of Tor would not have worked with OpenSSL 1.1.1,
- since they neither disabled TLS 1.3 nor enabled any of the
- ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
- Closes ticket 24978.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
- Country database.
- o Minor features (logging, diagnostic, backport from 0.3.3.2-alpha):
- - When logging a failure to create an onion service's descriptor,
- also log what the problem with the descriptor was. Diagnostic
- for ticket 24972.
- o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
- - Use the actual observed address of an incoming relay connection,
- not the canonical address of the relay from its descriptor, when
- making decisions about how to handle the incoming connection.
- Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
- o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- - Fix a possible crash on malformed consensus. If a consensus had
- contained an unparseable protocol line, it could have made clients
- and relays crash with a null-pointer exception. To exploit this
- issue, however, an attacker would need to be able to subvert the
- directory authority system. Fixes bug 25251; bugfix on
- 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
- o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
- - Directory authorities, when refusing a descriptor from a rejected
- relay, now explicitly tell the relay (in its logs) to set a valid
- ContactInfo address and contact the bad-relays@ mailing list.
- Fixes bug 25170; bugfix on 0.2.9.1.
- o Minor bugfixes (build, rust, backport from 0.3.3.1-alpha):
- - When building with Rust on OSX, link against libresolv, to work
- around the issue at https://github.com/rust-lang/rust/issues/46797.
- Fixes bug 24652; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (onion services, backport from 0.3.3.2-alpha):
- - Remove a BUG() statement when a client fetches an onion descriptor
- that has a lower revision counter than the one in its cache. This
- can happen in normal circumstances due to HSDir desync. Fixes bug
- 24976; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
- - Don't treat inability to store a cached consensus object as a bug:
- it can happen normally when we are out of disk space. Fixes bug
- 24859; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
- - Improve the performance of our consensus-diff application code
- when Tor is built with the --enable-fragile-hardening option set.
- Fixes bug 24826; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
- - Don't exit the Tor process if setrlimit() fails to change the file
- limit (which can happen sometimes on some versions of OSX). Fixes
- bug 21074; bugfix on 0.0.9pre5.
- o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
- 0.2.9.4-alpha.
- - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
- bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (testing, backport from 0.3.3.1-alpha):
- - Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
- 25005; bugfix on 0.3.2.7-rc.
- o Minor bugfixes (v3 onion services, backport from 0.3.3.2-alpha):
- - Look at the "HSRend" protocol version, not the "HSDir" protocol
- version, when deciding whether a consensus entry can support the
- v3 onion service protocol as a rendezvous point. Fixes bug 25105;
- bugfix on 0.3.2.1-alpha.
- o Code simplification and refactoring (backport from 0.3.3.3-alpha):
- - Update the "rust dependencies" submodule to be a project-level
- repository, rather than a user repository. Closes ticket 25323.
- o Documentation (backport from 0.3.3.1-alpha)
- - Document that operators who run more than one relay or bridge are
- expected to set MyFamily and ContactInfo correctly. Closes
- ticket 24526.
- Changes in version 0.3.3.3-alpha - 2018-03-03
- Tor 0.3.3.3-alpha is the third alpha release for the 0.3.3.x series.
- It includes an important security fix for a remote crash attack
- against directory authorities tracked as TROVE-2018-001.
- Additionally, with this release, we are upgrading the severity of a
- bug fixed in 0.3.3.2-alpha. Bug 24700, which was fixed in
- 0.3.3.2-alpha, can be remotely triggered in order to crash relays with
- a use-after-free pattern. As such, we are now tracking that bug as
- TROVE-2018-002 and CVE-2018-0491. This bug affected versions
- 0.3.2.1-alpha through 0.3.2.9, as well as 0.3.3.1-alpha.
- This release also fixes several minor bugs and annoyances from
- earlier releases.
- Relays running 0.3.2.x should upgrade to one of the versions released
- today, for the fix to TROVE-2018-002. Directory authorities should
- also upgrade. (Relays on earlier versions might want to update too for
- the DoS mitigations.)
- o Major bugfixes (denial-of-service, directory authority):
- - Fix a protocol-list handling bug that could be used to remotely crash
- directory authorities with a null-pointer exception. Fixes bug 25074;
- bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
- CVE-2018-0490.
- o Minor features (compatibility, OpenSSL):
- - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
- Previous versions of Tor would not have worked with OpenSSL 1.1.1,
- since they neither disabled TLS 1.3 nor enabled any of the
- ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
- Closes ticket 24978.
- o Minor features (logging):
- - Clarify the log messages produced when getrandom() or a related
- entropy-generation mechanism gives an error. Closes ticket 25120.
- o Minor features (testing):
- - Add a "make test-rust" target to run the rust tests only. Closes
- ticket 25071.
- o Minor bugfixes (denial-of-service):
- - Fix a possible crash on malformed consensus. If a consensus had
- contained an unparseable protocol line, it could have made clients
- and relays crash with a null-pointer exception. To exploit this
- issue, however, an attacker would need to be able to subvert the
- directory authority system. Fixes bug 25251; bugfix on
- 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
- o Minor bugfixes (DoS mitigation):
- - Add extra safety checks when refilling the circuit creation bucket
- to ensure we never set a value above the allowed maximum burst.
- Fixes bug 25202; bugfix on 0.3.3.2-alpha.
- - When a new consensus arrives, don't update our DoS-mitigation
- parameters if we aren't a public relay. Fixes bug 25223; bugfix
- on 0.3.3.2-alpha.
- o Minor bugfixes (man page, SocksPort):
- - Remove dead code from the old "SocksSocket" option, and rename
- SocksSocketsGroupWritable to UnixSocksGroupWritable. The old option
- still works, but is deprecated. Fixes bug 24343; bugfix on 0.2.6.3.
- o Minor bugfixes (performance):
- - Reduce the number of circuits that will be opened at once during
- the circuit build timeout phase. This is done by increasing the
- idle timeout to 3 minutes, and lowering the maximum number of
- concurrent learning circuits to 10. Fixes bug 24769; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (spec conformance):
- - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
- 0.2.9.4-alpha.
- - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
- bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (spec conformance, rust):
- - Resolve a denial-of-service issue caused by an infinite loop in
- the rust protover code. Fixes bug 25250, bugfix on 0.3.3.1-alpha.
- Also tracked as TROVE-2018-003.
- o Code simplification and refactoring:
- - Update the "rust dependencies" submodule to be a project-level
- repository, rather than a user repository. Closes ticket 25323.
- Changes in version 0.3.3.2-alpha - 2018-02-10
- Tor 0.3.3.2-alpha is the second alpha in the 0.3.3.x series. It
- introduces a mechanism to handle the high loads that many relay
- operators have been reporting recently. It also fixes several bugs in
- older releases. If this new code proves reliable, we plan to backport
- it to older supported release series.
- o Major features (denial-of-service mitigation):
- - Give relays some defenses against the recent network overload. We
- start with three defenses (default parameters in parentheses).
- First: if a single client address makes too many concurrent
- connections (>100), hang up on further connections. Second: if a
- single client address makes circuits too quickly (more than 3 per
- second, with an allowed burst of 90) while also having too many
- connections open (3), refuse new create cells for the next while
- (1-2 hours). Third: if a client asks to establish a rendezvous
- point to you directly, ignore the request. These defenses can be
- manually controlled by new torrc options, but relays will also
- take guidance from consensus parameters, so there's no need to
- configure anything manually. Implements ticket 24902.
- o Major bugfixes (netflow padding):
- - Stop adding unneeded channel padding right after we finish
- flushing to a connection that has been trying to flush for many
- seconds. Instead, treat all partial or complete flushes as
- activity on the channel, which will defer the time until we need
- to add padding. This fix should resolve confusing and scary log
- messages like "Channel padding timeout scheduled 221453ms in the
- past." Fixes bug 22212; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (protocol versions):
- - Add Link protocol version 5 to the supported protocols list. Fixes
- bug 25070; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (scheduler, consensus):
- - The scheduler subsystem was failing to promptly notice changes in
- consensus parameters, making it harder to switch schedulers
- network-wide. Fixes bug 24975; bugfix on 0.3.2.1-alpha.
- o Minor features (denial-of-service avoidance):
- - Make our OOM handler aware of the geoip client history cache so it
- doesn't fill up the memory. This check is important for IPv6 and
- our DoS mitigation subsystem. Closes ticket 25122.
- o Minor features (directory authority):
- - When directory authorities are unable to add signatures to a
- pending consensus, log the reason why. Closes ticket 24849.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
- Country database.
- o Minor features (logging, diagnostic):
- - When logging a failure to create an onion service's descriptor,
- also log what the problem with the descriptor was. Diagnostic for
- ticket 24972.
- o Minor bugfix (channel connection):
- - Use the actual observed address of an incoming relay connection,
- not the canonical address of the relay from its descriptor, when
- making decisions about how to handle the incoming connection.
- Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
- o Minor bugfix (directory authority):
- - Directory authorities, when refusing a descriptor from a rejected
- relay, now explicitly tell the relay (in its logs) to set a valid
- ContactInfo address and contact the bad-relays@ mailing list.
- Fixes bug 25170; bugfix on 0.2.9.1.
- o Minor bugfixes (all versions of Tor):
- - Use the "misspell" tool to detect and fix typos throughout the
- source code. Fixes bug 23650; bugfix on various versions of Tor.
- Patch from Deepesh Pathak.
- o Minor bugfixes (circuit, cannibalization):
- - Don't cannibalize preemptively-built circuits if we no longer
- recognize their first hop. This situation can happen if our Guard
- relay went off the consensus after the circuit was created. Fixes
- bug 24469; bugfix on 0.0.6.
- o Minor bugfixes (correctness):
- - Remove a nonworking, unnecessary check to see whether a circuit
- hop's identity digest was set when the circuit failed. Fixes bug
- 24927; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (logging):
- - Don't treat inability to store a cached consensus object as a bug:
- it can happen normally when we are out of disk space. Fixes bug
- 24859; bugfix on 0.3.1.1-alpha.
- - Fix a (mostly harmless) race condition when invoking
- LOG_PROTOCOL_WARN message from a subthread while the torrc options
- are changing. Fixes bug 23954; bugfix on 0.1.1.9-alpha.
- o Minor bugfixes (onion services):
- - Remove a BUG() statement when a client fetches an onion descriptor
- that has a lower revision counter than the one in its cache. This
- can happen in normal circumstances due to HSDir desync. Fixes bug
- 24976; bugfix on 0.3.2.1-alpha.
- - If we are configured to offer a single onion service, don't log
- long-term established one hop rendezvous points in the heartbeat.
- Fixes bug 25116; bugfix on 0.2.9.6-rc.
- o Minor bugfixes (performance):
- - Avoid calling protocol_list_supports_protocol() from inside tight
- loops when running with cached routerinfo_t objects. Instead,
- summarize the relevant protocols as flags in the routerinfo_t, as
- we do for routerstatus_t objects. This change simplifies our code
- a little, and saves a large amount of short-term memory allocation
- operations. Fixes bug 25008; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (Rust FFI):
- - Fix a minor memory leak which would happen whenever the C code
- would call the Rust implementation of
- protover_get_supported_protocols(). This was due to the C version
- returning a static string, whereas the Rust version newly allocated
- a CString to pass across the FFI boundary. Consequently, the C
- code was not expecting to need to free() what it was given. Fixes
- bug 25127; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (scheduler, KIST):
- - Avoid adding the same channel twice in the KIST scheduler pending
- list, which would waste CPU cycles. Fixes bug 24700; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (unit test, monotonic time):
- - Increase a constant (1msec to 10msec) in the monotonic time test
- that makes sure the nsec/usec/msec times read are synchronized.
- This change was needed to accommodate slow systems like armel or
- when the clock_gettime() is not a VDSO on the running kernel.
- Fixes bug 25113; bugfix on 0.2.9.1.
- o Minor bugfixes (v3 onion services):
- - Look at the "HSRend" protocol version, not the "HSDir" protocol
- version, when deciding whether a consensus entry can support the
- v3 onion service protocol as a rendezvous point. Fixes bug 25105;
- bugfix on 0.3.2.1-alpha.
- o Code simplification and refactoring:
- - Remove the unused nodelist_recompute_all_hsdir_indices(). Closes
- ticket 25108.
- - Remove a series of counters used to track circuit extend attempts
- and connection status but that in reality we aren't using for
- anything other than stats logged by a SIGUSR1 signal. Closes
- ticket 25163.
- o Documentation (man page):
- - The HiddenServiceVersion torrc option accepts only one number:
- either version 2 or 3. Closes ticket 25026; bugfix
- on 0.3.2.2-alpha.
- Changes in version 0.3.3.1-alpha - 2018-01-25
- Tor 0.3.3.1-alpha is the first release in the 0.3.3.x series. It adds
- several new features to Tor, including several improvements to
- bootstrapping, and support for an experimental "vanguards" feature to
- resist guard discovery attacks. This series also includes better
- support for applications that need to embed Tor or manage v3
- onion services.
- o Major features (embedding):
- - There is now a documented stable API for programs that need to
- embed Tor. See tor_api.h for full documentation and known bugs.
- Closes ticket 23684.
- - Tor now has support for restarting in the same process.
- Controllers that run Tor using the "tor_api.h" interface can now
- restart Tor after Tor has exited. This support is incomplete,
- however: we fixed crash bugs that prevented it from working at
- all, but many bugs probably remain, including a possibility of
- security issues. Implements ticket 24581.
- o Major features (IPv6, directory documents):
- - Add consensus method 27, which adds IPv6 ORPorts to the microdesc
- consensus. This information makes it easier for IPv6 clients to
- bootstrap and choose reachable entry guards. Implements ticket 23826.
- - Add consensus method 28, which removes IPv6 ORPorts from
- microdescriptors. Now that the consensus contains IPv6 ORPorts, they
- are redundant in microdescs. This change will be used by Tor clients
- on 0.2.8.x and later. (That is to say, with all Tor clients that
- have IPv6 bootstrap and guard support.) Implements ticket 23828.
- - Expand the documentation for AuthDirHasIPv6Connectivity when it is
- set by different numbers of authorities. Fixes 23870
- on 0.2.4.1-alpha.
- o Major features (onion service v3, control port):
- - The control port now supports commands and events for v3 onion
- services. It is now possible to create ephemeral v3 services using
- ADD_ONION. Additionally, several events (HS_DESC, HS_DESC_CONTENT,
- CIRC and CIRC_MINOR) and commands (GETINFO, HSPOST, ADD_ONION and
- DEL_ONION) have been extended to support v3 onion services. Closes
- ticket 20699; implements proposal 284.
- o Major features (onion services):
- - Provide torrc options to pin the second and third hops of onion
- service circuits to a list of nodes. The option HSLayer2Guards
- pins the second hop, and the option HSLayer3Guards pins the third
- hop. These options are for use in conjunction with experiments
- with "vanguards" for preventing guard enumeration attacks. Closes
- ticket 13837.
- o Major features (rust, portability, experimental):
- - Tor now ships with an optional implementation of one of its
- smaller modules (protover.c) in the Rust programming language. To
- try it out, install a Rust build environment, and configure Tor
- with "--enable-rust --enable-cargo-online-mode". This should not
- cause any user-visible changes, but should help us gain more
- experience with Rust, and plan future Rust integration work.
- Implementation by Chelsea Komlo. Closes ticket 22840.
- o Minor features (storage, configuration):
- - Users can store cached directory documents somewhere other than
- the DataDirectory by using the CacheDirectory option. Similarly,
- the storage location for relay's keys can be overridden with the
- KeyDirectory option. Closes ticket 22703.
- o Major features (v3 onion services, ipv6):
- - When v3 onion service clients send introduce cells, they now
- include the IPv6 address of the rendezvous point, if it has one.
- Current v3 onion services running 0.3.2 ignore IPv6 addresses, but
- in future Tor versions, IPv6-only v3 single onion services will be
- able to use IPv6 addresses to connect directly to the rendezvous
- point. Closes ticket 23577. Patch by Neel Chauhan.
- o Major bugfixes (onion services, retry behavior):
- - Fix an "off by 2" error in counting rendezvous failures on the
- onion service side. While we thought we would stop the rendezvous
- attempt after one failed circuit, we were actually making three
- circuit attempts before giving up. Now switch to a default of 2,
- and allow the consensus parameter "hs_service_max_rdv_failures" to
- override. Fixes bug 24895; bugfix on 0.0.6.
- - New-style (v3) onion services now obey the "max rendezvous circuit
- attempts" logic. Previously they would make as many rendezvous
- circuit attempts as they could fit in the MAX_REND_TIMEOUT second
- window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
- o Major bugfixes (relays):
- - Fix a set of false positives where relays would consider
- connections to other relays as being client-only connections (and
- thus e.g. deserving different link padding schemes) if those
- relays fell out of the consensus briefly. Now we look only at the
- initial handshake and whether the connection authenticated as a
- relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
- o Minor feature (IPv6):
- - Make IPv6-only clients wait for microdescs for relays, even if we
- were previously using descriptors (or were using them as a bridge)
- and have a cached descriptor for them. Implements ticket 23827.
- - When a consensus has IPv6 ORPorts, make IPv6-only clients use
- them, rather than waiting to download microdescriptors.
- Implements ticket 23827.
- o Minor features (cleanup):
- - Tor now deletes the CookieAuthFile and ExtORPortCookieAuthFile
- when it stops. Closes ticket 23271.
- o Minor features (defensive programming):
- - Most of the functions in Tor that free objects have been replaced
- with macros that free the objects and set the corresponding
- pointers to NULL. This change should help prevent a large class of
- dangling pointer bugs. Closes ticket 24337.
- - Where possible, the tor_free() macro now only evaluates its input
- once. Part of ticket 24337.
- - Check that microdesc ed25519 ids are non-zero in
- node_get_ed25519_id() before returning them. Implements ticket
- 24001, patch by "aruna1234".
- o Minor features (embedding):
- - Tor can now start with a preauthenticated control connection
- created by the process that launched it. This feature is meant for
- use by programs that want to launch and manage a Tor process
- without allowing other programs to manage it as well. For more
- information, see the __OwningControllerFD option documented in
- control-spec.txt. Closes ticket 23900.
- - On most errors that would cause Tor to exit, it now tries to
- return from the tor_main() function, rather than calling the
- system exit() function. Most users won't notice a difference here,
- but it should be significant for programs that run Tor inside
- a separate thread: they should now be able to survive Tor's exit
- conditions rather than having Tor shut down the entire process.
- Closes ticket 23848.
- - Applications that want to embed Tor can now tell Tor not to
- register any of its own POSIX signal handlers, using the
- __DisableSignalHandlers option. Closes ticket 24588.
- o Minor features (fallback directory list):
- - Avoid selecting fallbacks that change their IP addresses too
- often. Select more fallbacks by ignoring the Guard flag, and
- allowing lower cutoffs for the Running and V2Dir flags. Also allow
- a lower bandwidth, and a higher number of fallbacks per operator
- (5% of the list). Implements ticket 24785.
- - Update the fallback whitelist and blacklist based on opt-ins and
- relay changes. Closes tickets 22321, 24678, 22527, 24135,
- and 24695.
- o Minor features (fallback directory mirror configuration):
- - Add a nickname to each fallback in a C comment. This makes it
- easier for operators to find their relays, and allows stem to use
- nicknames to identify fallbacks. Implements ticket 24600.
- - Add a type and version header to the fallback directory mirror
- file. Also add a delimiter to the end of each fallback entry. This
- helps external parsers like stem and Relay Search. Implements
- ticket 24725.
- - Add an extrainfo cache flag for each fallback in a C comment. This
- allows stem to use fallbacks to fetch extra-info documents, rather
- than using authorities. Implements ticket 22759.
- - Add the generateFallbackDirLine.py script for automatically
- generating fallback directory mirror lines from relay fingerprints.
- No more typos! Add the lookupFallbackDirContact.py script for
- automatically looking up operator contact info from relay
- fingerprints. Implements ticket 24706, patch by teor and atagar.
- - Reject any fallback directory mirror that serves an expired
- consensus. Implements ticket 20942, patch by "minik".
- - Remove commas and equals signs from external string inputs to the
- fallback list. This avoids format confusion attacks. Implements
- ticket 24726.
- - Remove the "weight=10" line from fallback directory mirror
- entries. Ticket 24681 will maintain the current fallback weights
- by changing Tor's default fallback weight to 10. Implements
- ticket 24679.
- - Stop logging excessive information about fallback netblocks.
- Implements ticket 24791.
- o Minor features (forward-compatibility):
- - If a relay supports some link authentication protocol that we do
- not recognize, then include that relay's ed25519 key when telling
- other relays to extend to it. Previously, we treated future
- versions as if they were too old to support ed25519 link
- authentication. Closes ticket 20895.
- o Minor features (heartbeat):
- - Add onion service information to our heartbeat logs, displaying
- stats about the activity of configured onion services. Closes
- ticket 24896.
- o Minor features (instrumentation, development):
- - Add the MainloopStats option to allow developers to get
- instrumentation information from the main event loop via the
- heartbeat messages. We hope to use this to improve Tor's behavior
- when it's trying to sleep. Closes ticket 24605.
- o Minor features (log messages):
- - Improve a warning message that happens when we fail to re-parse an
- old router because of an expired certificate. Closes ticket 20020.
- - Make the log more quantitative when we hit MaxMemInQueues
- threshold exposing some values. Closes ticket 24501.
- o Minor features (logging, android):
- - Added support for the Android logging subsystem. Closes
- ticket 24362.
- o Minor features (performance):
- - Support predictive circuit building for onion service circuits
- with multiple layers of guards. Closes ticket 23101.
- - Use stdatomic.h where available, rather than mutexes, to implement
- atomic_counter_t. Closes ticket 23953.
- o Minor features (performance, 32-bit):
- - Improve performance on 32-bit systems by avoiding 64-bit division
- when calculating the timestamp in milliseconds for channel padding
- computations. Implements ticket 24613.
- - Improve performance on 32-bit systems by avoiding 64-bit division
- when timestamping cells and buffer chunks for OOM calculations.
- Implements ticket 24374.
- o Minor features (performance, OSX, iOS):
- - Use the mach_approximate_time() function (when available) to
- implement coarse monotonic time. Having a coarse time function
- should avoid a large number of system calls, and improve
- performance slightly, especially under load. Closes ticket 24427.
- o Minor features (performance, windows):
- - Improve performance on Windows Vista and Windows 7 by adjusting
- TCP send window size according to the recommendation from
- SIO_IDEAL_SEND_BACKLOG_QUERY. Closes ticket 22798. Patch
- from Vort.
- o Major features (relay):
- - Implement an option, ReducedExitPolicy, to allow an Tor exit relay
- operator to use a more reasonable ("reduced") exit policy, rather
- than the default one. If you want to run an exit node without
- thinking too hard about which ports to allow, this one is for you.
- Closes ticket 13605. Patch from Neel Chauhan.
- o Minor features (testing, debugging, embedding):
- - For development purposes, Tor now has a mode in which it runs for
- a few seconds, then stops, and starts again without exiting the
- process. This mode is meant to help us debug various issues with
- ticket 23847. To use this feature, compile with
- --enable-restart-debugging, and set the TOR_DEBUG_RESTART
- environment variable. This is expected to crash a lot, and is
- really meant for developers only. It will likely be removed in a
- future release. Implements ticket 24583.
- o Minor bugfix (network IPv6 test):
- - Tor's test scripts now check if "ping -6 ::1" works when the user
- runs "make test-network-all". Fixes bug 24677; bugfix on
- 0.2.9.3-alpha. Patch by "ffmancera".
- o Minor bugfixes (build, rust):
- - Fix output of autoconf checks to display success messages for Rust
- dependencies and a suitable rustc compiler version. Fixes bug
- 24612; bugfix on 0.3.1.3-alpha.
- - When building with Rust on OSX, link against libresolv, to work
- around the issue at https://github.com/rust-lang/rust/issues/46797.
- Fixes bug 24652; bugfix on 0.3.1.1-alpha.
- - Don't pass the --quiet option to cargo: it seems to suppress some
- errors, which is not what we want to do when building. Fixes bug
- 24518; bugfix on 0.3.1.7.
- - Build correctly when building from outside Tor's source tree with
- the TOR_RUST_DEPENDENCIES option set. Fixes bug 22768; bugfix
- on 0.3.1.7.
- o Minor bugfixes (directory authorities, IPv6):
- - When creating a routerstatus (vote) from a routerinfo (descriptor),
- set the IPv6 address to the unspecified IPv6 address, and
- explicitly initialize the port to zero. Fixes bug 24488; bugfix
- on 0.2.4.1-alpha.
- o Minor bugfixes (fallback directory mirrors):
- - Make updateFallbackDirs.py search harder for python. (Some OSs
- don't put it in /usr/bin.) Fixes bug 24708; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (hibernation, bandwidth accounting, shutdown):
- - When hibernating, close connections normally and allow them to
- flush. Fixes bug 23571; bugfix on 0.2.4.7-alpha. Also fixes
- bug 7267.
- - Do not attempt to launch self-reachability tests when entering
- hibernation. Fixes a case of bug 12062; bugfix on 0.0.9pre5.
- - Resolve several bugs related to descriptor fetching on bridge
- clients with bandwidth accounting enabled. (This combination is
- not recommended!) Fixes a case of bug 12062; bugfix
- on 0.2.0.3-alpha.
- - When hibernating, do not attempt to launch DNS checks. Fixes a
- case of bug 12062; bugfix on 0.1.2.2-alpha.
- - When hibernating, do not try to upload or download descriptors.
- Fixes a case of bug 12062; bugfix on 0.0.9pre5.
- o Minor bugfixes (IPv6, bridges):
- - Tor now always sets IPv6 preferences for bridges. Fixes bug 24573;
- bugfix on 0.2.8.2-alpha.
- - Tor now sets IPv6 address in the routerstatus as well as in the
- router descriptors when updating addresses for a bridge. Closes
- ticket 24572; bugfix on 0.2.4.5-alpha. Patch by "ffmancera".
- o Minor bugfixes (linux seccomp2 sandbox):
- - When running with the sandbox enabled, reload configuration files
- correctly even when %include was used. Previously we would crash.
- Fixes bug 22605; bugfix on 0.3.1. Patch from Daniel Pinto.
- o Minor bugfixes (memory leaks):
- - Avoid possible at-exit memory leaks related to use of Libevent's
- event_base_once() function. (This function tends to leak memory if
- the event_base is closed before the event fires.) Fixes bug 24584;
- bugfix on 0.2.8.1-alpha.
- - Fix a harmless memory leak in tor-resolve. Fixes bug 24582; bugfix
- on 0.2.1.1-alpha.
- o Minor bugfixes (OSX):
- - Don't exit the Tor process if setrlimit() fails to change the file
- limit (which can happen sometimes on some versions of OSX). Fixes
- bug 21074; bugfix on 0.0.9pre5.
- o Minor bugfixes (performance, fragile-hardening):
- - Improve the performance of our consensus-diff application code
- when Tor is built with the --enable-fragile-hardening option set.
- Fixes bug 24826; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (performance, timeouts):
- - Consider circuits for timeout as soon as they complete a hop. This
- is more accurate than applying the timeout in
- circuit_expire_building() because that function is only called
- once per second, which is now too slow for typical timeouts on the
- current network. Fixes bug 23114; bugfix on 0.2.2.2-alpha.
- - Use onion service circuits (and other circuits longer than 3 hops)
- to calculate a circuit build timeout. Previously, Tor only
- calculated its build timeout based on circuits that planned to be
- exactly 3 hops long. With this change, we include measurements
- from all circuits at the point where they complete their third
- hop. Fixes bug 23100; bugfix on 0.2.2.2-alpha.
- o Minor bugfixes (testing):
- - Give out Exit flags in bootstrapping networks. Fixes bug 24137;
- bugfix on 0.2.3.1-alpha.
- - Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
- 25005; bugfix on 0.3.2.7-rc.
- o Code simplification and refactoring:
- - Remove /usr/athena from search path in configure.ac. Closes
- ticket 24363.
- - Remove duplicate code in node_has_curve25519_onion_key() and
- node_get_curve25519_onion_key(), and add a check for a zero
- microdesc curve25519 onion key. Closes ticket 23966, patch by
- "aruna1234" and teor.
- - Rewrite channel_rsa_id_group_set_badness to reduce temporary
- memory allocations with large numbers of OR connections (e.g.
- relays). Closes ticket 24119.
- - Separate the function that deletes ephemeral files when Tor
- stops gracefully.
- - Small changes to Tor's buf_t API to make it suitable for use as a
- general-purpose safe string constructor. Closes ticket 22342.
- - Switch -Wnormalized=id to -Wnormalized=nfkc in configure.ac to
- avoid source code identifier confusion. Closes ticket 24467.
- - The tor_git_revision[] constant no longer needs to be redeclared
- by everything that links against the rest of Tor. Done as part of
- ticket 23845, to simplify our external API.
- - We make extend_info_from_node() use node_get_curve25519_onion_key()
- introduced in ticket 23577 to access the curve25519 public keys
- rather than accessing it directly. Closes ticket 23760. Patch by
- Neel Chauhan.
- - Add a function to log channels' scheduler state changes to aid
- debugging efforts. Closes ticket 24531.
- o Documentation:
- - Add documentation on how to build tor with Rust dependencies
- without having to be online. Closes ticket 22907; bugfix
- on 0.3.0.3-alpha.
- - Clarify the behavior of RelayBandwidth{Rate,Burst} with client
- traffic. Closes ticket 24318.
- - Document that OutboundBindAddress doesn't apply to DNS requests.
- Closes ticket 22145. Patch from Aruna Maurya.
- - Document that operators who run more than one relay or bridge are
- expected to set MyFamily and ContactInfo correctly. Closes
- ticket 24526.
- o Code simplification and refactoring (channels):
- - Remove the incoming and outgoing channel queues. These were never
- used, but still took up a step in our fast path.
- - The majority of the channel unit tests have been rewritten and the
- code coverage has now been raised to 83.6% for channel.c. Closes
- ticket 23709.
- - Remove other dead code from the channel subsystem: All together,
- this cleanup has removed more than 1500 lines of code overall and
- adding very little except for unit test.
- o Code simplification and refactoring (circuit rendezvous):
- - Split the client-side rendezvous circuit lookup into two
- functions: one that returns only established circuits and another
- that returns all kinds of circuits. Closes ticket 23459.
- o Code simplification and refactoring (controller):
- - Make most of the variables in networkstatus_getinfo_by_purpose()
- const. Implements ticket 24489.
- Changes in version 0.3.2.9 - 2018-01-09
- Tor 0.3.2.9 is the first stable release in the 0.3.2 series.
- The 0.3.2 series includes our long-anticipated new onion service
- design, with numerous security features. (For more information, see
- our blog post at https://blog.torproject.org/fall-harvest.) We also
- have a new circuit scheduler algorithm for improved performance on
- relays everywhere (see https://blog.torproject.org/kist-and-tell),
- along with many smaller features and bugfixes.
- Per our stable release policy, we plan to support each stable release
- series for at least the next nine months, or for three months after
- the first stable release of the next series: whichever is longer. If
- you need a release with long-term support, we recommend that you stay
- with the 0.2.9 series.
- Below is a list of the changes since 0.3.2.8-rc. For a list of all
- changes since 0.3.1, see the ReleaseNotes file.
- o Minor features (fallback directory mirrors):
- - The fallback directory list has been re-generated based on the
- current status of the network. Tor uses fallback directories to
- bootstrap when it doesn't yet have up-to-date directory
- information. Closes ticket 24801.
- - Make the default DirAuthorityFallbackRate 0.1, so that clients
- prefer to bootstrap from fallback directory mirrors. This is a
- follow-up to 24679, which removed weights from the default
- fallbacks. Implements ticket 24681.
- o Minor features (geoip):
- - Update geoip and geoip6 to the January 5 2018 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (address selection):
- - When the fascist_firewall_choose_address_ functions don't find a
- reachable address, set the returned address to the null address
- and port. This is a precautionary measure, because some callers do
- not check the return value. Fixes bug 24736; bugfix
- on 0.2.8.2-alpha.
- o Minor bugfixes (compilation):
- - Resolve a few shadowed-variable warnings in the onion service
- code. Fixes bug 24634; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (portability, msvc):
- - Fix a bug in the bit-counting parts of our timing-wheel code on
- MSVC. (Note that MSVC is still not a supported build platform, due
- to cryptographic timing channel risks.) Fixes bug 24633; bugfix
- on 0.2.9.1-alpha.
- Changes in version 0.3.2.8-rc - 2017-12-21
- Tor 0.3.2.8-rc fixes a pair of bugs in the KIST and KISTLite
- schedulers that had led servers under heavy load to overload their
- outgoing connections. All relay operators running earlier 0.3.2.x
- versions should upgrade. This version also includes a mitigation for
- over-full DESTROY queues leading to out-of-memory conditions: if it
- works, we will soon backport it to earlier release series.
- This is the second release candidate in the 0.3.2 series. If we find
- no new bugs or regression here, then the first stable 0.3.2 release
- will be nearly identical to this.
- o Major bugfixes (KIST, scheduler):
- - The KIST scheduler did not correctly account for data already
- enqueued in each connection's send socket buffer, particularly in
- cases when the TCP/IP congestion window was reduced between
- scheduler calls. This situation lead to excessive per-connection
- buffering in the kernel, and a potential memory DoS. Fixes bug
- 24665; bugfix on 0.3.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the December 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (hidden service v3):
- - Bump hsdir_spread_store parameter from 3 to 4 in order to increase
- the probability of reaching a service for a client missing
- microdescriptors. Fixes bug 24425; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (memory usage):
- - When queuing DESTROY cells on a channel, only queue the circuit-id
- and reason fields: not the entire 514-byte cell. This fix should
- help mitigate any bugs or attacks that fill up these queues, and
- free more RAM for other uses. Fixes bug 24666; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (scheduler, KIST):
- - Use a sane write limit for KISTLite when writing onto a connection
- buffer instead of using INT_MAX and shoving as much as it can.
- Because the OOM handler cleans up circuit queues, we are better
- off at keeping them in that queue instead of the connection's
- buffer. Fixes bug 24671; bugfix on 0.3.2.1-alpha.
- Changes in version 0.3.2.7-rc - 2017-12-14
- Tor 0.3.2.7-rc fixes various bugs in earlier versions of Tor,
- including some that could affect reliability or correctness.
- This is the first release candidate in the 0.3.2 series. If we find no
- new bugs or regression here, then the first stable 0.3.2. release will
- be nearly identical to this.
- o Major bugfixes (circuit prediction):
- - Fix circuit prediction logic so that a client doesn't treat a port
- as being "handled" by a circuit if that circuit already has
- isolation settings on it. This change should make Tor clients more
- responsive by improving their chances of having a pre-created
- circuit ready for use when a request arrives. Fixes bug 18859;
- bugfix on 0.2.3.3-alpha.
- o Minor features (logging):
- - Provide better warnings when the getrandom() syscall fails. Closes
- ticket 24500.
- o Minor features (portability):
- - Tor now compiles correctly on arm64 with libseccomp-dev installed.
- (It doesn't yet work with the sandbox enabled.) Closes
- ticket 24424.
- o Minor bugfixes (bridge clients, bootstrap):
- - Retry directory downloads when we get our first bridge descriptor
- during bootstrap or while reconnecting to the network. Keep
- retrying every time we get a bridge descriptor, until we have a
- reachable bridge. Fixes part of bug 24367; bugfix on 0.2.0.3-alpha.
- - Stop delaying bridge descriptor fetches when we have cached bridge
- descriptors. Instead, only delay bridge descriptor fetches when we
- have at least one reachable bridge. Fixes part of bug 24367;
- bugfix on 0.2.0.3-alpha.
- - Stop delaying directory fetches when we have cached bridge
- descriptors. Instead, only delay bridge descriptor fetches when
- all our bridges are definitely unreachable. Fixes part of bug
- 24367; bugfix on 0.2.0.3-alpha.
- o Minor bugfixes (compilation):
- - Fix a signed/unsigned comparison warning introduced by our fix to
- TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
- o Minor bugfixes (correctness):
- - Fix several places in our codebase where a C compiler would be
- likely to eliminate a check, based on assuming that undefined
- behavior had not happened elsewhere in the code. These cases are
- usually a sign of redundant checking or dubious arithmetic. Found
- by Georg Koppen using the "STACK" tool from Wang, Zeldovich,
- Kaashoek, and Solar-Lezama. Fixes bug 24423; bugfix on various
- Tor versions.
- o Minor bugfixes (onion service v3):
- - Fix a race where an onion service would launch a new intro circuit
- after closing an old one, but fail to register it before freeing
- the previously closed circuit. This bug was making the service
- unable to find the established intro circuit and thus not upload
- its descriptor, thus making a service unavailable for up to 24
- hours. Fixes bug 23603; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (scheduler, KIST):
- - Properly set the scheduler state of an unopened channel in the
- KIST scheduler main loop. This prevents a harmless but annoying
- log warning. Fixes bug 24502; bugfix on 0.3.2.4-alpha.
- - Avoid a possible integer overflow when computing the available
- space on the TCP buffer of a channel. This had no security
- implications; but could make KIST allow too many cells on a
- saturated connection. Fixes bug 24590; bugfix on 0.3.2.1-alpha.
- - Downgrade to "info" a harmless warning about the monotonic time
- moving backwards: This can happen on platform not supporting
- monotonic time. Fixes bug 23696; bugfix on 0.3.2.1-alpha.
- Changes in version 0.3.2.6-alpha - 2017-12-01
- This version of Tor is the latest in the 0.3.2 alpha series. It
- includes fixes for several important security issues. All Tor users
- should upgrade to this release, or to one of the other releases coming
- out today.
- o Major bugfixes (security):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - Fix a denial of service issue where an attacker could crash a
- directory authority using a malformed router descriptor. Fixes bug
- 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
- and CVE-2017-8820.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- - When running as a relay, make sure that we never choose ourselves
- as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
- issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
- o Minor feature (relay statistics):
- - Change relay bandwidth reporting stats interval from 4 hours to 24
- hours in order to reduce the efficiency of guard discovery
- attacks. Fixes ticket 23856.
- o Minor features (directory authority):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor bugfixes (client):
- - By default, do not enable storage of client-side DNS values. These
- values were unused by default previously, but they should not have
- been cached at all. Fixes bug 24050; bugfix on 0.2.6.3-alpha.
- Changes in version 0.3.1.9 - 2017-12-01:
- Tor 0.3.1.9 backports important security and stability fixes from the
- 0.3.2 development series. All Tor users should upgrade to this
- release, or to another of the releases coming out today.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - Fix a denial of service issue where an attacker could crash a
- directory authority using a malformed router descriptor. Fixes bug
- 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
- and CVE-2017-8820.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- - When running as a relay, make sure that we never choose ourselves
- as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
- issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
- o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
- making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
- 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
- identifying and finding a workaround to this bug and to Moritz,
- Arthur Edelstein, and Roger for helping to track it down and
- analyze it.
- o Minor features (bridge):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (directory authority, backport from 0.3.2.6-alpha):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- - Avoid unnecessary calls to directory_fetches_from_authorities() on
- relays, to prevent spurious address resolutions and descriptor
- rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
- bugfix on in 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- - Fix unused variable warnings in donna's Curve25519 SSE2 code.
- Fixes bug 22895; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- - When a circuit is marked for close, do not attempt to package any
- cells for channels on that circuit. Previously, we would detect
- this condition lower in the call stack, when we noticed that the
- circuit had no attached channel, and log an annoying message.
- Fixes bug 8185; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (onion service, backport from 0.3.2.5-alpha):
- - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
- so it matches dir-spec.txt. Fixes bug 24262; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- - Avoid a crash when transitioning from client mode to bridge mode.
- Previously, we would launch the worker threads whenever our
- "public server" mode changed, but not when our "server" mode
- changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
- Changes in version 0.3.0.13 - 2017-12-01
- Tor 0.3.0.13 backports important security and stability bugfixes from
- later Tor releases. All Tor users should upgrade to this release, or
- to another of the releases coming out today.
- Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
- 2018. If you need a release with long-term support, please stick with
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - Fix a denial of service issue where an attacker could crash a
- directory authority using a malformed router descriptor. Fixes bug
- 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
- and CVE-2017-8820.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- - When running as a relay, make sure that we never choose ourselves
- as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
- issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
- o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
- making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
- 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
- identifying and finding a workaround to this bug and to Moritz,
- Arthur Edelstein, and Roger for helping to track it down and
- analyze it.
- o Minor features (security, windows, backport from 0.3.1.1-alpha):
- - Enable a couple of pieces of Windows hardening: one
- (HeapEnableTerminationOnCorruption) that has been on-by-default
- since Windows 8, and unavailable before Windows 7; and one
- (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
- affect us, but shouldn't do any harm. Closes ticket 21953.
- o Minor features (bridge, backport from 0.3.1.9):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (directory authority, backport from 0.3.2.6-alpha):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- - Avoid unnecessary calls to directory_fetches_from_authorities() on
- relays, to prevent spurious address resolutions and descriptor
- rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
- bugfix on in 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- - Fix unused variable warnings in donna's Curve25519 SSE2 code.
- Fixes bug 22895; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- - When a circuit is marked for close, do not attempt to package any
- cells for channels on that circuit. Previously, we would detect
- this condition lower in the call stack, when we noticed that the
- circuit had no attached channel, and log an annoying message.
- Fixes bug 8185; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- - Avoid a crash when transitioning from client mode to bridge mode.
- Previously, we would launch the worker threads whenever our
- "public server" mode changed, but not when our "server" mode
- changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
- bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- Changes in version 0.2.9.14 - 2017-12-01
- Tor 0.3.0.13 backports important security and stability bugfixes from
- later Tor releases. All Tor users should upgrade to this release, or
- to another of the releases coming out today.
- o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
- making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
- 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
- identifying and finding a workaround to this bug and to Moritz,
- Arthur Edelstein, and Roger for helping to track it down and
- analyze it.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - Fix a denial of service issue where an attacker could crash a
- directory authority using a malformed router descriptor. Fixes bug
- 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
- and CVE-2017-8820.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- o Minor features (bridge, backport from 0.3.1.9):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (directory authority, backport from 0.3.2.6-alpha):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor features (security, windows, backport from 0.3.1.1-alpha):
- - Enable a couple of pieces of Windows hardening: one
- (HeapEnableTerminationOnCorruption) that has been on-by-default
- since Windows 8, and unavailable before Windows 7; and one
- (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
- affect us, but shouldn't do any harm. Closes ticket 21953.
- o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- - Avoid unnecessary calls to directory_fetches_from_authorities() on
- relays, to prevent spurious address resolutions and descriptor
- rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
- bugfix on in 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- - Fix unused variable warnings in donna's Curve25519 SSE2 code.
- Fixes bug 22895; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- - When a circuit is marked for close, do not attempt to package any
- cells for channels on that circuit. Previously, we would detect
- this condition lower in the call stack, when we noticed that the
- circuit had no attached channel, and log an annoying message.
- Fixes bug 8185; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- - Avoid a crash when transitioning from client mode to bridge mode.
- Previously, we would launch the worker threads whenever our
- "public server" mode changed, but not when our "server" mode
- changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
- bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- Changes in version 0.2.8.17 - 2017-12-01
- Tor 0.2.8.17 backports important security and stability bugfixes from
- later Tor releases. All Tor users should upgrade to this release, or
- to another of the releases coming out today.
- Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
- 2018. If you need a release with long-term support, please upgrade with
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path through
- ourselves, even in the case where we have somehow lost the version of
- our descriptor appearing in the consensus. Fixes part of bug 21534;
- bugfix on 0.2.0.1-alpha. This issue is also tracked as TROVE-2017-012
- and CVE-2017-8822.
- o Minor features (bridge, backport from 0.3.1.9):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (directory authority, backport from 0.3.2.6-alpha):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
- bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- Changes in version 0.2.5.16 - 2017-12-01
- Tor 0.2.5.13 backports important security and stability bugfixes from
- later Tor releases. All Tor users should upgrade to this release, or
- to another of the releases coming out today.
- Note: the Tor 0.2.5 series will no longer be supported after 1 May
- 2018. If you need a release with long-term support, please upgrade to
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- o Minor features (bridge, backport from 0.3.1.9):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- Changes in version 0.3.2.5-alpha - 2017-11-22
- Tor 0.3.2.5-alpha is the fifth alpha release in the 0.3.2.x series. It
- fixes several stability and reliability bugs, including a fix for
- intermittent bootstrapping failures that some people have been seeing
- since the 0.3.0.x series.
- Please test this alpha out -- many of these fixes will soon be
- backported to stable Tor versions if no additional bugs are found
- in them.
- o Major bugfixes (bootstrapping):
- - Fetch descriptors aggressively whenever we lack enough to build
- circuits, regardless of how many descriptors we are missing.
- Previously, we would delay launching the fetch when we had fewer
- than 15 missing descriptors, even if some of those descriptors
- were blocking circuits from building. Fixes bug 23985; bugfix on
- 0.1.1.11-alpha. The effects of this bug became worse in
- 0.3.0.3-alpha, when we began treating missing descriptors from our
- primary guards as a reason to delay circuits.
- - Don't try fetching microdescriptors from relays that have failed
- to deliver them in the past. Fixes bug 23817; bugfix
- on 0.3.0.1-alpha.
- o Minor features (directory authority):
- - Make the "Exit" flag assignment only depend on whether the exit
- policy allows connections to ports 80 and 443. Previously relays
- would get the Exit flag if they allowed connections to one of
- these ports and also port 6667. Resolves ticket 23637.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor features (linux seccomp2 sandbox):
- - Update the sandbox rules so that they should now work correctly
- with Glibc 2.26. Closes ticket 24315.
- o Minor features (logging):
- - Downgrade a pair of log messages that could occur when an exit's
- resolver gave us an unusual (but not forbidden) response. Closes
- ticket 24097.
- - Improve the message we log when re-enabling circuit build timeouts
- after having received a consensus. Closes ticket 20963.
- o Minor bugfixes (compilation):
- - Fix a memory leak warning in one of the libevent-related
- configuration tests that could occur when manually specifying
- -fsanitize=address. Fixes bug 24279; bugfix on 0.3.0.2-alpha.
- Found and patched by Alex Xu.
- - When detecting OpenSSL on Windows from our configure script, make
- sure to try linking with the ws2_32 library. Fixes bug 23783;
- bugfix on 0.3.2.2-alpha.
- o Minor bugfixes (control port, linux seccomp2 sandbox):
- - Avoid a crash when attempting to use the seccomp2 sandbox together
- with the OwningControllerProcess feature. Fixes bug 24198; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (control port, onion services):
- - Report "FAILED" instead of "UPLOAD_FAILED" "FAILED" for the
- HS_DESC event when a service is not able to upload a descriptor.
- Fixes bug 24230; bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (directory cache):
- - Recover better from empty or corrupt files in the consensus cache
- directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
- - When a consensus diff calculation is only partially successful,
- only record the successful parts as having succeeded. Partial
- success can happen if (for example) one compression method fails
- but the others succeed. Previously we misrecorded all the
- calculations as having succeeded, which would later cause a
- nonfatal assertion failure. Fixes bug 24086; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (logging):
- - Only log once if we notice that KIST support is gone. Fixes bug
- 24158; bugfix on 0.3.2.1-alpha.
- - Suppress a log notice when relay descriptors arrive. We already
- have a bootstrap progress for this so no need to log notice
- everytime tor receives relay descriptors. Microdescriptors behave
- the same. Fixes bug 23861; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (network layer):
- - When closing a connection via close_connection_immediately(), we
- mark it as "not blocked on bandwidth", to prevent later calls from
- trying to unblock it, and give it permission to read. This fixes a
- backtrace warning that can happen on relays under various
- circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (onion services):
- - The introduction circuit was being timed out too quickly while
- waiting for the rendezvous circuit to complete. Keep the intro
- circuit around longer instead of timing out and reopening new ones
- constantly. Fixes bug 23681; bugfix on 0.2.4.8-alpha.
- - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
- so it matches dir-spec.txt. Fixes bug 24262; bugfix
- on 0.3.1.1-alpha.
- - Silence a warning about failed v3 onion descriptor uploads that
- can happen naturally under certain edge cases. Fixes part of bug
- 23662; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (tests):
- - Fix a memory leak in one of the bridge-distribution test cases.
- Fixes bug 24345; bugfix on 0.3.2.3-alpha.
- - Fix a bug in our fuzzing mock replacement for crypto_pk_checksig(),
- to correctly handle cases where a caller gives it an RSA key of
- under 160 bits. (This is not actually a bug in Tor itself, but
- rather in our fuzzing code.) Fixes bug 24247; bugfix on
- 0.3.0.3-alpha. Found by OSS-Fuzz as issue 4177.
- o Documentation:
- - Add notes in man page regarding OS support for the various
- scheduler types. Attempt to use less jargon in the scheduler
- section. Closes ticket 24254.
- Changes in version 0.3.2.4-alpha - 2017-11-08
- Tor 0.3.2.4-alpha is the fourth alpha release in the 0.3.2.x series.
- It fixes several stability and reliability bugs, especially including
- a major reliability issue that has been plaguing fast exit relays in
- recent months.
- o Major bugfixes (exit relays, DNS):
- - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
- making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
- 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
- identifying and finding a workaround to this bug and to Moritz,
- Arthur Edelstein, and Roger for helping to track it down and
- analyze it.
- o Major bugfixes (scheduler, channel):
- - Stop processing scheduled channels if they closed while flushing
- cells. This can happen if the write on the connection fails
- leading to the channel being closed while in the scheduler loop.
- Fixes bug 23751; bugfix on 0.3.2.1-alpha.
- o Minor features (logging, scheduler):
- - Introduce a SCHED_BUG() function to log extra information about
- the scheduler state if we ever catch a bug in the scheduler.
- Closes ticket 23753.
- o Minor features (removed deprecations):
- - The ClientDNSRejectInternalAddresses flag can once again be set in
- non-testing Tor networks, so long as they do not use the default
- directory authorities. This change also removes the deprecation of
- this flag from 0.2.9.2-alpha. Closes ticket 21031.
- o Minor features (testing):
- - Our fuzzing tests now test the encrypted portions of v3 onion
- service descriptors. Implements more of 21509.
- o Minor bugfixes (directory client):
- - On failure to download directory information, delay retry attempts
- by a random amount based on the "decorrelated jitter" algorithm.
- Our previous delay algorithm tended to produce extra-long delays
- too easily. Fixes bug 23816; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (IPv6, v3 single onion services):
- - Remove buggy code for IPv6-only v3 single onion services, and
- reject attempts to configure them. This release supports IPv4,
- dual-stack, and IPv6-only v3 onion services; and IPv4 and dual-
- stack v3 single onion services. Fixes bug 23820; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (logging, relay):
- - Give only a protocol warning when the ed25519 key is not
- consistent between the descriptor and microdescriptor of a relay.
- This can happen, for instance, if the relay has been flagged
- NoEdConsensus. Fixes bug 24025; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (manpage, onion service):
- - Document that the HiddenServiceNumIntroductionPoints option is
- 0-10 for v2 services and 0-20 for v3 services. Fixes bug 24115;
- bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (memory leaks):
- - Fix a minor memory leak at exit in the KIST scheduler. This bug
- should have no user-visible impact. Fixes bug 23774; bugfix
- on 0.3.2.1-alpha.
- - Fix a memory leak when decrypting a badly formatted v3 onion
- service descriptor. Fixes bug 24150; bugfix on 0.3.2.1-alpha.
- Found by OSS-Fuzz; this is OSS-Fuzz issue 3994.
- o Minor bugfixes (onion services):
- - Cache some needed onion service client information instead of
- constantly computing it over and over again. Fixes bug 23623;
- bugfix on 0.3.2.1-alpha.
- - Properly retry HSv3 descriptor fetches when missing required
- directory information. Fixes bug 23762; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (path selection):
- - When selecting relays by bandwidth, avoid a rounding error that
- could sometimes cause load to be imbalanced incorrectly.
- Previously, we would always round upwards; now, we round towards
- the nearest integer. This had the biggest effect when a relay's
- weight adjustments should have given it weight 0, but it got
- weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- - When calculating the fraction of nodes that have descriptors, and
- all nodes in the network have zero bandwidths, count the number of
- nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- - Actually log the total bandwidth in compute_weighted_bandwidths().
- Fixes bug 24170; bugfix on 0.2.4.3-alpha.
- o Minor bugfixes (relay, crash):
- - Avoid a crash when transitioning from client mode to bridge mode.
- Previously, we would launch the worker threads whenever our
- "public server" mode changed, but not when our "server" mode
- changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (testing):
- - Fix a spurious fuzzing-only use of an uninitialized value. Found
- by Brian Carpenter. Fixes bug 24082; bugfix on 0.3.0.3-alpha.
- - Test that IPv6-only clients can use microdescriptors when running
- "make test-network-all". Requires chutney master 61c28b9 or later.
- Closes ticket 24109.
- Changes in version 0.3.2.3-alpha - 2017-10-27
- Tor 0.3.2.3-alpha is the third release in the 0.3.2 series. It fixes
- numerous small bugs in earlier versions of 0.3.2.x, and adds a new
- directory authority, Bastet.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Minor features (bridge):
- - Bridge relays can now set the BridgeDistribution config option to
- add a "bridge-distribution-request" line to their bridge
- descriptor, which tells BridgeDB how they'd like their bridge
- address to be given out. (Note that as of Oct 2017, BridgeDB does
- not yet implement this feature.) As a side benefit, this feature
- provides a way to distinguish bridge descriptors from non-bridge
- descriptors. Implements tickets 18329.
- o Minor features (client, entry guards):
- - Improve log messages when missing descriptors for primary guards.
- Resolves ticket 23670.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (bridge):
- - Overwrite the bridge address earlier in the process of retrieving
- its descriptor, to make sure we reach it on the configured
- address. Fixes bug 20532; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (documentation):
- - Document better how to read gcov, and what our gcov postprocessing
- scripts do. Fixes bug 23739; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (entry guards):
- - Tor now updates its guard state when it reads a consensus
- regardless of whether it's missing descriptors. That makes tor use
- its primary guards to fetch descriptors in some edge cases where
- it would previously have used fallback directories. Fixes bug
- 23862; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (hidden service client):
- - When handling multiple SOCKS request for the same .onion address,
- only fetch the service descriptor once.
- - When a descriptor fetch fails with a non-recoverable error, close
- all pending SOCKS requests for that .onion. Fixes bug 23653;
- bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (hidden service):
- - Always regenerate missing hidden service public key files. Prior
- to this, if the public key was deleted from disk, it wouldn't get
- recreated. Fixes bug 23748; bugfix on 0.3.2.2-alpha. Patch
- from "cathugger".
- - Make sure that we have a usable ed25519 key when the intro point
- relay supports ed25519 link authentication. Fixes bug 24002;
- bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (hidden service, v2):
- - When reloading configured hidden services, copy all information
- from the old service object. Previously, some data was omitted,
- causing delays in descriptor upload, and other bugs. Fixes bug
- 23790; bugfix on 0.2.1.9-alpha.
- o Minor bugfixes (memory safety, defensive programming):
- - Clear the target address when node_get_prim_orport() returns
- early. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (relay):
- - Avoid a BUG warning when receiving a dubious CREATE cell while an
- option transition is in progress. Fixes bug 23952; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (testing):
- - Adjust the GitLab CI configuration to more closely match that of
- Travis CI. Fixes bug 23757; bugfix on 0.3.2.2-alpha.
- - Prevent scripts/test/coverage from attempting to move gcov output
- to the root directory. Fixes bug 23741; bugfix on 0.2.5.1-alpha.
- - When running unit tests as root, skip a test that would fail
- because it expects a permissions error. This affects some
- continuous integration setups. Fixes bug 23758; bugfix
- on 0.3.2.2-alpha.
- - Stop unconditionally mirroring the tor repository in GitLab CI.
- This prevented developers from enabling GitLab CI on master. Fixes
- bug 23755; bugfix on 0.3.2.2-alpha.
- - Fix the hidden service v3 descriptor decoding fuzzing to use the
- latest decoding API correctly. Fixes bug 21509; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (warnings):
- - When we get an HTTP request on a SOCKS port, tell the user about
- the new HTTPTunnelPort option. Previously, we would give a "Tor is
- not an HTTP Proxy" message, which stopped being true when
- HTTPTunnelPort was introduced. Fixes bug 23678; bugfix
- on 0.3.2.1-alpha.
- Changes in version 0.2.5.15 - 2017-10-25
- Tor 0.2.5.15 backports a collection of bugfixes from later Tor release
- series. It also adds a new directory authority, Bastet.
- Note: the Tor 0.2.5 series will no longer be supported after 1 May
- 2018. If you need a release with long-term support, please upgrade to
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xx" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- o Build features (backport from 0.3.1.5-alpha):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- Changes in version 0.2.8.16 - 2017-10-25
- Tor 0.2.8.16 backports a collection of bugfixes from later Tor release
- series, including a bugfix for a crash issue that had affected relays
- under memory pressure. It also adds a new directory authority, Bastet.
- Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
- 2018. If you need a release with long-term support, please stick with
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.9.13 - 2017-10-25
- Tor 0.2.9.13 backports a collection of bugfixes from later Tor release
- series, including a bugfix for a crash issue that had affected relays
- under memory pressure. It also adds a new directory authority, Bastet.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
- - When a directory authority rejects a descriptor or extrainfo with
- a given digest, mark that digest as undownloadable, so that we do
- not attempt to download it again over and over. We previously
- tried to avoid downloading such descriptors by other means, but we
- didn't notice if we accidentally downloaded one anyway. This
- behavior became problematic in 0.2.7.2-alpha, when authorities
- began pinning Ed25519 keys. Fixes bug 22349; bugfix
- on 0.2.1.19-alpha.
- o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- - Clear the address when node_get_prim_orport() returns early.
- Fixes bug 23874; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
- - When running as a Windows service, set the ID of the main thread
- correctly. Failure to do so made us fail to send log messages to
- the controller in 0.2.1.16-rc, slowed down controller event
- delivery in 0.2.7.3-rc and later, and crash with an assertion
- failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
- Patch and diagnosis from "Vort".
- Changes in version 0.3.0.12 - 2017-10-25
- Tor 0.3.0.12 backports a collection of bugfixes from later Tor release
- series, including a bugfix for a crash issue that had affected relays
- under memory pressure. It also adds a new directory authority, Bastet.
- Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
- 2018. If you need a release with long-term support, please stick with
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
- - When a directory authority rejects a descriptor or extrainfo with
- a given digest, mark that digest as undownloadable, so that we do
- not attempt to download it again over and over. We previously
- tried to avoid downloading such descriptors by other means, but we
- didn't notice if we accidentally downloaded one anyway. This
- behavior became problematic in 0.2.7.2-alpha, when authorities
- began pinning Ed25519 keys. Fixes bug 22349; bugfix
- on 0.2.1.19-alpha.
- o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
- - Avoid a possible double close of a circuit by the intro point on
- error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
- bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- - Clear the address when node_get_prim_orport() returns early.
- Fixes bug 23874; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
- - When running as a Windows service, set the ID of the main thread
- correctly. Failure to do so made us fail to send log messages to
- the controller in 0.2.1.16-rc, slowed down controller event
- delivery in 0.2.7.3-rc and later, and crash with an assertion
- failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
- Patch and diagnosis from "Vort".
- Changes in version 0.3.1.8 - 2017-10-25
- Tor 0.3.1.8 is the second stable release in the 0.3.1 series.
- It includes several bugfixes, including a bugfix for a crash issue
- that had affected relays under memory pressure. It also adds
- a new directory authority, Bastet.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.3.2.2-alpha):
- - Fix a compilation warning when building with zstd support on
- 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
- and fixed by Andreas Stieger.
- o Minor bugfixes (compression, backport from 0.3.2.2-alpha):
- - Handle a pathological case when decompressing Zstandard data when
- the output buffer size is zero. Fixes bug 23551; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (directory authority, backport from 0.3.2.1-alpha):
- - Remove the length limit on HTTP status lines that authorities can
- send in their replies. Fixes bug 23499; bugfix on 0.3.1.6-rc.
- o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
- - Avoid a possible double close of a circuit by the intro point on
- error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
- bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- - Clear the address when node_get_prim_orport() returns early.
- Fixes bug 23874; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (unit tests, backport from 0.3.2.2-alpha):
- - Fix additional channelpadding unit test failures by using mocked
- time instead of actual time for all tests. Fixes bug 23608; bugfix
- on 0.3.1.1-alpha.
- Changes in version 0.3.2.2-alpha - 2017-09-29
- Tor 0.3.2.2-alpha is the second release in the 0.3.2 series. This
- release fixes several minor bugs in the new scheduler and next-
- generation onion services; both features were newly added in the 0.3.2
- series. Other fixes in this alpha include several fixes for non-fatal
- tracebacks which would appear in logs.
- With the aim to stabilise the 0.3.2 series by 15 December 2017, this
- alpha does not contain any substantial new features. Minor features
- include better testing and logging.
- The following comprises the complete list of changes included
- in 0.3.2.2-alpha:
- o Major bugfixes (relay, crash, assertion failure):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Major bugfixes (scheduler):
- - If a channel is put into the scheduler's pending list, then it
- starts closing, and then if the scheduler runs before it finishes
- closing, the scheduler will get stuck trying to flush its cells
- while the lower layers refuse to cooperate. Fix that race
- condition by giving the scheduler an escape method. Fixes bug
- 23676; bugfix on 0.3.2.1-alpha.
- o Minor features (build, compilation):
- - The "check-changes" feature is now part of the "make check" tests;
- we'll use it to try to prevent misformed changes files from
- accumulating. Closes ticket 23564.
- - Tor builds should now fail if there are any mismatches between the
- C type representing a configuration variable and the C type the
- data-driven parser uses to store a value there. Previously, we
- needed to check these by hand, which sometimes led to mistakes.
- Closes ticket 23643.
- o Minor features (directory authorities):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (hidden service, circuit, logging):
- - Improve logging of many callsite in the circuit subsystem to print
- the circuit identifier(s).
- - Log when we cleanup an intro point from a service so we know when
- and for what reason it happened. Closes ticket 23604.
- o Minor features (logging):
- - Log more circuit information whenever we are about to try to
- package a relay cell on a circuit with a nonexistent n_chan.
- Attempt to diagnose ticket 8185.
- - Improve info-level log identification of particular circuits, to
- help with debugging. Closes ticket 23645.
- o Minor features (relay):
- - When choosing which circuits can be expired as unused, consider
- circuits from clients even if those clients used regular CREATE
- cells to make them; and do not consider circuits from relays even
- if they were made with CREATE_FAST. Part of ticket 22805.
- o Minor features (robustness):
- - Change several fatal assertions when flushing buffers into non-
- fatal assertions, to prevent any recurrence of 23690.
- o Minor features (spec conformance, bridge, diagnostic):
- - When handling the USERADDR command on an ExtOrPort, warn when the
- transports provides a USERADDR with no port. In a future version,
- USERADDR commands of this format may be rejected. Detects problems
- related to ticket 23080.
- o Minor features (testing):
- - Add a unit test to make sure that our own generated platform
- string will be accepted by directory authorities. Closes
- ticket 22109.
- o Minor bugfixes (bootstrapping):
- - When warning about state file clock skew, report the correct
- direction for the detected skew. Fixes bug 23606; bugfix
- on 0.2.8.1-alpha.
- - Avoid an assertion failure when logging a state file clock skew
- very early in bootstrapping. Fixes bug 23607; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (build, compilation):
- - Fix a compilation warning when building with zstd support on
- 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
- and fixed by Andreas Stieger.
- - When searching for OpenSSL, don't accept any OpenSSL library that
- lacks TLSv1_1_method(): Tor doesn't build with those versions.
- Additionally, look in /usr/local/opt/openssl, if it's present.
- These changes together repair the default build on OSX systems
- with Homebrew installed. Fixes bug 23602; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (compression):
- - Handle a pathological case when decompressing Zstandard data when
- the output buffer size is zero. Fixes bug 23551; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (documentation):
- - Fix manpage to not refer to the obsolete (and misspelled)
- UseEntryGuardsAsDirectoryGuards parameter in the description of
- NumDirectoryGuards. Fixes bug 23611; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (hidden service v3):
- - Don't log an assertion failure when we can't find the right
- information to extend to an introduction point. In rare cases,
- this could happen, causing a warning, even though tor would
- recover gracefully. Fixes bug 23159; bugfix on 0.3.2.1-alpha.
- - Pad RENDEZVOUS cell up to the size of the legacy cell which is
- much bigger so the rendezvous point can't distinguish which hidden
- service protocol is being used. Fixes bug 23420; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (hidden service, relay):
- - Avoid a possible double close of a circuit by the intro point on
- error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
- bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (logging, relay shutdown, annoyance):
- - When a circuit is marked for close, do not attempt to package any
- cells for channels on that circuit. Previously, we would detect
- this condition lower in the call stack, when we noticed that the
- circuit had no attached channel, and log an annoying message.
- Fixes bug 8185; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (scheduler):
- - When switching schedulers due to a consensus change, we didn't
- give the new scheduler a chance to react to the consensus. Fix
- that. Fixes bug 23537; bugfix on 0.3.2.1-alpha.
- - Make the KISTSchedRunInterval option a non negative value. With
- this, the way to disable KIST through the consensus is to set it
- to 0. Fixes bug 23539; bugfix on 0.3.2.1-alpha.
- - Only notice log the selected scheduler when we switch scheduler
- types. Fixes bug 23552; bugfix on 0.3.2.1-alpha.
- - Avoid a compilation warning on macOS in scheduler_ev_add() caused
- by a different tv_usec data type. Fixes bug 23575; bugfix
- on 0.3.2.1-alpha.
- - Make a hard exit if tor is unable to pick a scheduler which can
- happen if the user specifies a scheduler type that is not
- supported and not other types in Schedulers. Fixes bug 23581;
- bugfix on 0.3.2.1-alpha.
- - Properly initialize the scheduler last run time counter so it is
- not 0 at the first tick. Fixes bug 23696; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (testing):
- - Capture and detect several "Result does not fit" warnings in unit
- tests on platforms with 32-bit time_t. Fixes bug 21800; bugfix
- on 0.2.9.3-alpha.
- - Fix additional channelpadding unit test failures by using mocked
- time instead of actual time for all tests. Fixes bug 23608; bugfix
- on 0.3.1.1-alpha.
- - The removal of some old scheduler options caused some tests to
- fail on BSD systems. Assume current behavior is correct and make
- the tests pass again. Fixes bug 23566; bugfix on 0.3.2.1-alpha.
- o Code simplification and refactoring:
- - Remove various ways of testing circuits and connections for
- "clientness"; instead, favor channel_is_client(). Part of
- ticket 22805.
- o Deprecated features:
- - The ReachableDirAddresses and ClientPreferIPv6DirPort options are
- now deprecated; they do not apply to relays, and they have had no
- effect on clients since 0.2.8.x. Closes ticket 19704.
- o Documentation:
- - HiddenServiceVersion man page entry wasn't mentioning the now
- supported version 3. Fixes ticket 23580; bugfix on 0.3.2.1-alpha.
- - Clarify that the Address option is entirely about setting an
- advertised IPv4 address. Closes ticket 18891.
- - Clarify the manpage's use of the term "address" to clarify what
- kind of address is intended. Closes ticket 21405.
- - Document that onion service subdomains are allowed, and ignored.
- Closes ticket 18736.
- Changes in version 0.3.2.1-alpha - 2017-09-18
- Tor 0.3.2.1-alpha is the first release in the 0.3.2.x series. It
- includes support for our next-generation ("v3") onion service
- protocol, and adds a new circuit scheduler for more responsive
- forwarding decisions from relays. There are also numerous other small
- features and bugfixes here.
- Below are the changes since Tor 0.3.1.7.
- o Major feature (scheduler, channel):
- - Tor now uses new schedulers to decide which circuits should
- deliver cells first, in order to improve congestion at relays. The
- first type is called "KIST" ("Kernel Informed Socket Transport"),
- and is only available on Linux-like systems: it uses feedback from
- the kernel to prevent the kernel's TCP buffers from growing too
- full. The second new scheduler type is called "KISTLite": it
- behaves the same as KIST, but runs on systems without kernel
- support for inspecting TCP implementation details. The old
- scheduler is still available, under the name "Vanilla". To change
- the default scheduler preference order, use the new "Schedulers"
- option. (The default preference order is "KIST,KISTLite,Vanilla".)
- Matt Traudt implemented KIST, based on research by Rob Jansen,
- John Geddes, Christ Wacek, Micah Sherr, and Paul Syverson. For
- more information, see the design paper at
- http://www.robgjansen.com/publications/kist-sec2014.pdf and the
- followup implementation paper at https://arxiv.org/abs/1709.01044.
- Closes ticket 12541.
- o Major features (next-generation onion services):
- - Tor now supports the next-generation onion services protocol for
- clients and services! As part of this release, the core of
- proposal 224 has been implemented and is available for
- experimentation and testing by our users. This newer version of
- onion services ("v3") features many improvements over the legacy
- system, including:
- a) Better crypto (replaced SHA1/DH/RSA1024
- with SHA3/ed25519/curve25519)
- b) Improved directory protocol, leaking much less information to
- directory servers.
- c) Improved directory protocol, with smaller surface for
- targeted attacks.
- d) Better onion address security against impersonation.
- e) More extensible introduction/rendezvous protocol.
- f) A cleaner and more modular codebase.
- You can identify a next-generation onion address by its length:
- they are 56 characters long, as in
- "4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion".
- In the future, we will release more options and features for v3
- onion services, but we first need a testing period, so that the
- current codebase matures and becomes more robust. Planned features
- include: offline keys, advanced client authorization, improved
- guard algorithms, and statistics. For full details, see
- proposal 224.
- Legacy ("v2") onion services will still work for the foreseeable
- future, and will remain the default until this new codebase gets
- tested and hardened. Service operators who want to experiment with
- the new system can use the 'HiddenServiceVersion 3' torrc
- directive along with the regular onion service configuration
- options. We will publish a blog post about this new feature
- soon! Enjoy!
- o Major bugfixes (usability, control port):
- - Report trusted clock skew indications as bootstrap errors, so
- controllers can more easily alert users when their clocks are
- wrong. Fixes bug 23506; bugfix on 0.1.2.6-alpha.
- o Minor features (bug detection):
- - Log a warning message with a stack trace for any attempt to call
- get_options() during option validation. This pattern has caused
- subtle bugs in the past. Closes ticket 22281.
- o Minor features (client):
- - You can now use Tor as a tunneled HTTP proxy: use the new
- HTTPTunnelPort option to open a port that accepts HTTP CONNECT
- requests. Closes ticket 22407.
- - Add an extra check to make sure that we always use the newer guard
- selection code for picking our guards. Closes ticket 22779.
- - When downloading (micro)descriptors, don't split the list into
- multiple requests unless we want at least 32 descriptors.
- Previously, we split at 4, not 32, which led to significant
- overhead in HTTP request size and degradation in compression
- performance. Closes ticket 23220.
- o Minor features (command line):
- - Add a new commandline option, --key-expiration, which prints when
- the current signing key is going to expire. Implements ticket
- 17639; patch by Isis Lovecruft.
- o Minor features (control port):
- - If an application tries to use the control port as an HTTP proxy,
- respond with a meaningful "This is the Tor control port" message,
- and log the event. Closes ticket 1667. Patch from Ravi
- Chandra Padmala.
- - Provide better error message for GETINFO desc/(id|name) when not
- fetching router descriptors. Closes ticket 5847. Patch by
- Kevin Butler.
- - Add GETINFO "{desc,md}/download-enabled", to inform the controller
- whether Tor will try to download router descriptors and
- microdescriptors respectively. Closes ticket 22684.
- - Added new GETINFO targets "ip-to-country/{ipv4,ipv6}-available",
- so controllers can tell whether the geoip databases are loaded.
- Closes ticket 23237.
- - Adds a timestamp field to the CIRC_BW and STREAM_BW bandwidth
- events. Closes ticket 19254. Patch by "DonnchaC".
- o Minor features (development support):
- - Developers can now generate a call-graph for Tor using the
- "calltool" python program, which post-processes object dumps. It
- should work okay on many Linux and OSX platforms, and might work
- elsewhere too. To run it, install calltool from
- https://gitweb.torproject.org/user/nickm/calltool.git and run
- "make callgraph". Closes ticket 19307.
- o Minor features (ed25519):
- - Add validation function to checks for torsion components in
- ed25519 public keys, used by prop224 client-side code. Closes
- ticket 22006. Math help by Ian Goldberg.
- o Minor features (exit relay, DNS):
- - Improve the clarity and safety of the log message from evdns when
- receiving an apparently spoofed DNS reply. Closes ticket 3056.
- o Minor features (integration, hardening):
- - Add a new NoExec option to prevent Tor from running other
- programs. When this option is set to 1, Tor will never try to run
- another program, regardless of the settings of
- PortForwardingHelper, ClientTransportPlugin, or
- ServerTransportPlugin. Once NoExec is set, it cannot be disabled
- without restarting Tor. Closes ticket 22976.
- o Minor features (logging):
- - Improve the warning message for specifying a relay by nickname.
- The previous message implied that nickname registration was still
- part of the Tor network design, which it isn't. Closes
- ticket 20488.
- - If the sandbox filter fails to load, suggest to the user that
- their kernel might not support seccomp2. Closes ticket 23090.
- o Minor features (portability):
- - Check at configure time whether uint8_t is the same type as
- unsigned char. Lots of existing code already makes this
- assumption, and there could be strict aliasing issues if the
- assumption is violated. Closes ticket 22410.
- o Minor features (relay, configuration):
- - Reject attempts to use relative file paths when RunAsDaemon is
- set. Previously, Tor would accept these, but the directory-
- changing step of RunAsDaemon would give strange and/or confusing
- results. Closes ticket 22731.
- o Minor features (startup, safety):
- - When configured to write a PID file, Tor now exits if it is unable
- to do so. Previously, it would warn and continue. Closes
- ticket 20119.
- o Minor features (static analysis):
- - The BUG() macro has been changed slightly so that Coverity no
- longer complains about dead code if the bug is impossible. Closes
- ticket 23054.
- o Minor features (testing):
- - The default chutney network tests now include tests for the v3
- hidden service design. Make sure you have the latest version of
- chutney if you want to run these. Closes ticket 22437.
- - Add a unit test to verify that we can parse a hardcoded v2 hidden
- service descriptor. Closes ticket 15554.
- o Minor bugfixes (certificate handling):
- - Fix a time handling bug in Tor certificates set to expire after
- the year 2106. Fixes bug 23055; bugfix on 0.3.0.1-alpha. Found by
- Coverity as CID 1415728.
- o Minor bugfixes (client, usability):
- - Refrain from needlessly rejecting SOCKS5-with-hostnames and
- SOCKS4a requests that contain IP address strings, even when
- SafeSocks in enabled, as this prevents user from connecting to
- known IP addresses without relying on DNS for resolving. SafeSocks
- still rejects SOCKS connections that connect to IP addresses when
- those addresses are _not_ encoded as hostnames. Fixes bug 22461;
- bugfix on Tor 0.2.6.2-alpha.
- o Minor bugfixes (code correctness):
- - Call htons() in extend_cell_format() for encoding a 16-bit value.
- Previously we used ntohs(), which happens to behave the same on
- all the platforms we support, but which isn't really correct.
- Fixes bug 23106; bugfix on 0.2.4.8-alpha.
- - For defense-in-depth, make the controller's write_escaped_data()
- function robust to extremely long inputs. Fixes bug 19281; bugfix
- on 0.1.1.1-alpha. Reported by Guido Vranken.
- o Minor bugfixes (compilation):
- - Fix unused-variable warnings in donna's Curve25519 SSE2 code.
- Fixes bug 22895; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (consensus expiry):
- - Check for adequate directory information correctly. Previously, Tor
- would reconsider whether it had sufficient directory information
- every 2 minutes. Fixes bug 23091; bugfix on 0.2.0.19-alpha.
- o Minor bugfixes (directory protocol):
- - Directory servers now include a "Date:" http header for response
- codes other than 200. Clients starting with a skewed clock and a
- recent consensus were getting "304 Not modified" responses from
- directory authorities, so without the Date header, the client
- would never hear about a wrong clock. Fixes bug 23499; bugfix
- on 0.0.8rc1.
- - Make clients wait for 6 seconds before trying to download a
- consensus from an authority. Fixes bug 17750; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (DoS-resistance):
- - If future code asks if there are any running bridges, without
- checking if bridges are enabled, log a BUG warning rather than
- crashing. Fixes bug 23524; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (format strictness):
- - Restrict several data formats to decimal. Previously, the
- BuildTimeHistogram entries in the state file, the "bw=" entries in
- the bandwidth authority file, and the process IDs passed to the
- __OwningControllerProcess option could all be specified in hex or
- octal as well as in decimal. This was not an intentional feature.
- Fixes bug 22802; bugfixes on 0.2.2.1-alpha, 0.2.2.2-alpha,
- and 0.2.2.28-beta.
- o Minor bugfixes (heartbeat):
- - If we fail to write a heartbeat message, schedule a retry for the
- minimum heartbeat interval number of seconds in the future. Fixes
- bug 19476; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, logging):
- - Fix some messages on unexpected errors from the seccomp2 library.
- Fixes bug 22750; bugfix on 0.2.5.1-alpha. Patch from "cypherpunks".
- o Minor bugfixes (logging):
- - Remove duplicate log messages regarding opening non-local
- SocksPorts upon parsing config and opening listeners at startup.
- Fixes bug 4019; bugfix on 0.2.3.3-alpha.
- - Use a more comprehensible log message when telling the user
- they've excluded every running exit node. Fixes bug 7890; bugfix
- on 0.2.2.25-alpha.
- - When logging the number of descriptors we intend to download per
- directory request, do not log a number higher than then the number
- of descriptors we're fetching in total. Fixes bug 19648; bugfix
- on 0.1.1.8-alpha.
- - When warning about a directory owned by the wrong user, log the
- actual name of the user owning the directory. Previously, we'd log
- the name of the process owner twice. Fixes bug 23487; bugfix
- on 0.2.9.1-alpha.
- - The tor specification says hop counts are 1-based, so fix two log
- messages that mistakenly logged 0-based hop counts. Fixes bug
- 18982; bugfix on 0.2.6.2-alpha and 0.2.4.5-alpha. Patch by teor.
- Credit to Xiaofan Li for reporting this issue.
- o Minor bugfixes (portability):
- - Stop using the PATH_MAX variable, which is not defined on GNU
- Hurd. Fixes bug 23098; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (relay):
- - When uploading our descriptor for the first time after startup,
- report the reason for uploading as "Tor just started" rather than
- leaving it blank. Fixes bug 22885; bugfix on 0.2.3.4-alpha.
- - Avoid unnecessary calls to directory_fetches_from_authorities() on
- relays, to prevent spurious address resolutions and descriptor
- rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
- bugfix on in 0.2.8.1-alpha.
- o Minor bugfixes (tests):
- - Fix a broken unit test for the OutboundAddress option: the parsing
- function was never returning an error on failure. Fixes bug 23366;
- bugfix on 0.3.0.3-alpha.
- - Fix a signed-integer overflow in the unit tests for
- dir/download_status_random_backoff, which was untriggered until we
- fixed bug 17750. Fixes bug 22924; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (usability, control port):
- - Stop making an unnecessary routerlist check in NETINFO clock skew
- detection; this was preventing clients from reporting NETINFO clock
- skew to controllers. Fixes bug 23532; bugfix on 0.2.4.4-alpha.
- o Code simplification and refactoring:
- - Extract the code for handling newly-open channels into a separate
- function from the general code to handle channel state
- transitions. This change simplifies our callgraph, reducing the
- size of the largest strongly connected component by roughly a
- factor of two. Closes ticket 22608.
- - Remove dead code for largely unused statistics on the number of
- times we've attempted various public key operations. Fixes bug
- 19871; bugfix on 0.1.2.4-alpha. Fix by Isis Lovecruft.
- - Remove several now-obsolete functions for asking about old
- variants directory authority status. Closes ticket 22311; patch
- from "huyvq".
- - Remove some of the code that once supported "Named" and "Unnamed"
- routers. Authorities no longer vote for these flags. Closes
- ticket 22215.
- - Rename the obsolete malleable hybrid_encrypt functions used in TAP
- and old hidden services, to indicate that they aren't suitable for
- new protocols or formats. Closes ticket 23026.
- - Replace our STRUCT_OFFSET() macro with offsetof(). Closes ticket
- 22521. Patch from Neel Chauhan.
- - Split the enormous circuit_send_next_onion_skin() function into
- multiple subfunctions. Closes ticket 22804.
- - Split the portions of the buffer.c module that handle particular
- protocols into separate modules. Part of ticket 23149.
- - Use our test macros more consistently, to produce more useful
- error messages when our unit tests fail. Add coccinelle patches to
- allow us to re-check for test macro uses. Closes ticket 22497.
- o Deprecated features:
- - Deprecate HTTPProxy/HTTPProxyAuthenticator config options. They
- only applies to direct unencrypted HTTP connections to your
- directory server, which your Tor probably isn't using. Closes
- ticket 20575.
- o Documentation:
- - Clarify in the manual that "Sandbox 1" is only supported on Linux
- kernels. Closes ticket 22677.
- - Document all values of PublishServerDescriptor in the manpage.
- Closes ticket 15645.
- - Improve the documentation for the directory port part of the
- DirAuthority line. Closes ticket 20152.
- - Restore documentation for the authorities' "approved-routers"
- file. Closes ticket 21148.
- o Removed features:
- - The AllowDotExit option has been removed as unsafe. It has been
- deprecated since 0.2.9.2-alpha. Closes ticket 23426.
- - The ClientDNSRejectInternalAddresses flag can no longer be set on
- non-testing networks. It has been deprecated since 0.2.9.2-alpha.
- Closes ticket 21031.
- - The controller API no longer includes an AUTHDIR_NEWDESCS event:
- nobody was using it any longer. Closes ticket 22377.
- Changes in version 0.2.8.15 - 2017-09-18
- Tor 0.2.8.15 backports a collection of bugfixes from later
- Tor series.
- Most significantly, it includes a fix for TROVE-2017-008, a
- security bug that affects hidden services running with the
- SafeLogging option disabled. For more information, see
- https://trac.torproject.org/projects/tor/ticket/23490
- Note that Tor 0.2.8.x will no longer be supported after 1 Jan
- 2018. We suggest that you upgrade to the latest stable release if
- possible. If you can't, we recommend that you upgrade at least to
- 0.2.9, which will be supported until 2020.
- o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xx" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Minor features:
- - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- - Backport a fix for an "unused variable" warning that appeared
- in some versions of mingw. Fixes bug 22838; bugfix on
- 0.2.8.1-alpha.
- o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- o Build features (backport from 0.3.1.5-alpha):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- Changes in version 0.2.9.12 - 2017-09-18
- Tor 0.2.9.12 backports a collection of bugfixes from later
- Tor series.
- Most significantly, it includes a fix for TROVE-2017-008, a
- security bug that affects hidden services running with the
- SafeLogging option disabled. For more information, see
- https://trac.torproject.org/projects/tor/ticket/23490
- o Major features (security, backport from 0.3.0.2-alpha):
- - Change the algorithm used to decide DNS TTLs on client and server
- side, to better resist DNS-based correlation attacks like the
- DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
- Feamster. Now relays only return one of two possible DNS TTL
- values, and clients are willing to believe DNS TTL values up to 3
- hours long. Closes ticket 19769.
- o Major bugfixes (crash, directory connections, backport from 0.3.0.5-rc):
- - Fix a rare crash when sending a begin cell on a circuit whose
- linked directory connection had already been closed. Fixes bug
- 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
- o Major bugfixes (DNS, backport from 0.3.0.2-alpha):
- - Fix a bug that prevented exit nodes from caching DNS records for
- more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
- o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
- - Fix a typo that had prevented TPROXY-based transparent proxying
- from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
- Patch from "d4fq0fQAgoJ".
- o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xx" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Minor features (code style, backport from 0.3.1.3-alpha):
- - Add "Falls through" comments to our codebase, in order to silence
- GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
- Stieger. Closes ticket 22446.
- o Minor features (geoip):
- - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (bandwidth accounting, backport from 0.3.1.1-alpha):
- - Roll over monthly accounting at the configured hour and minute,
- rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
- Found by Andrey Karpov with PVS-Studio.
- o Minor bugfixes (compilation, backport from 0.3.1.5-alpha):
- - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
- bugfix on 0.2.8.1-alpha.
- - Fix warnings when building with libscrypt and openssl scrypt support
- on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- - When building with certain versions the mingw C header files, avoid
- float-conversion warnings when calling the C functions isfinite(),
- isnan(), and signbit(). Fixes bug 22801; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.1.7):
- - Avoid compiler warnings in the unit tests for running tor_sscanf()
- with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- - Backport a fix for an "unused variable" warning that appeared
- in some versions of mingw. Fixes bug 22838; bugfix on
- 0.2.8.1-alpha.
- o Minor bugfixes (controller, backport from 0.3.1.7):
- - Do not crash when receiving a HSPOST command with an empty body.
- Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- - Do not crash when receiving a POSTDESCRIPTOR command with an
- empty body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
- - Avoid Coverity build warnings related to our BUG() macro. By
- default, Coverity treats BUG() as the Linux kernel does: an
- instant abort(). We need to override that so our BUG() macro
- doesn't prevent Coverity from analyzing functions that use it.
- Fixes bug 23030; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
- - When setting the maximum number of connections allowed by the OS,
- always allow some extra file descriptors for other files. Fixes
- bug 22797; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
- - Avoid a sandbox failure when trying to re-bind to a socket and
- mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
- - Permit the fchmod system call, to avoid crashing on startup when
- starting with the seccomp2 sandbox and an unexpected set of
- permissions on the data directory or its contents. Fixes bug
- 22516; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (relay, backport from 0.3.0.5-rc):
- - Avoid a double-marked-circuit warning that could happen when we
- receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
- on 0.1.0.1-rc.
- o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
- - Reject version numbers with non-numeric prefixes (such as +, -, or
- whitespace). Disallowing whitespace prevents differential version
- parsing between POSIX-based and Windows platforms. Fixes bug 21507
- and part of 21508; bugfix on 0.0.8pre1.
- o Build features (backport from 0.3.1.5-alpha):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- Changes in version 0.3.0.11 - 2017-09-18
- Tor 0.3.0.11 backports a collection of bugfixes from Tor the 0.3.1
- series.
- Most significantly, it includes a fix for TROVE-2017-008, a
- security bug that affects hidden services running with the
- SafeLogging option disabled. For more information, see
- https://trac.torproject.org/projects/tor/ticket/23490
- o Minor features (code style, backport from 0.3.1.7):
- - Add "Falls through" comments to our codebase, in order to silence
- GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
- Stieger. Closes ticket 22446.
- o Minor features:
- - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.3.1.7):
- - Avoid compiler warnings in the unit tests for calling tor_sscanf()
- with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (controller, backport from 0.3.1.7):
- - Do not crash when receiving a HSPOST command with an empty body.
- Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- - Do not crash when receiving a POSTDESCRIPTOR command with an empty
- body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
- - When setting the maximum number of connections allowed by the OS,
- always allow some extra file descriptors for other files. Fixes
- bug 22797; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (logging, relay, backport from 0.3.1.6-rc):
- - Remove a forgotten debugging message when an introduction point
- successfully establishes a hidden service prop224 circuit with
- a client.
- - Change three other log_warn() for an introduction point to
- protocol warnings, because they can be failure from the network
- and are not relevant to the operator. Fixes bug 23078; bugfix on
- 0.3.0.1-alpha and 0.3.0.2-alpha.
- Changes in version 0.3.1.7 - 2017-09-18
- Tor 0.3.1.7 is the first stable release in the 0.3.1 series.
- With the 0.3.1 series, Tor now serves and downloads directory
- information in more compact formats, to save on bandwidth overhead. It
- also contains a new padding system to resist netflow-based traffic
- analysis, and experimental support for building parts of Tor in Rust
- (though no parts of Tor are in Rust yet). There are also numerous
- small features, bugfixes on earlier release series, and groundwork for
- the hidden services revamp of 0.3.2.
- This release also includes a fix for TROVE-2017-008, a security bug
- that affects hidden services running with the SafeLogging option
- disabled. For more information, see
- https://trac.torproject.org/projects/tor/ticket/23490
- Per our stable release policy, we plan to support each stable release
- series for at least the next nine months, or for three months after
- the first stable release of the next series: whichever is longer. If
- you need a release with long-term support, we recommend that you stay
- with the 0.2.9 series.
- Below is a list of the changes since 0.3.1.6-rc. For a list of all
- changes since 0.3.0, see the ReleaseNotes file.
- o Major bugfixes (security, hidden services, loggging):
- - Fix a bug where we could log uninitialized stack when a certain
- hidden service error occurred while SafeLogging was disabled.
- Fixes bug #23490; bugfix on 0.2.7.2-alpha. This is also tracked as
- TROVE-2017-008 and CVE-2017-0380.
- o Minor features (defensive programming):
- - Create a pair of consensus parameters, nf_pad_tor2web and
- nf_pad_single_onion, to disable netflow padding in the consensus
- for non-anonymous connections in case the overhead is high. Closes
- ticket 17857.
- o Minor features (diagnostic):
- - Add a stack trace to the bug warnings that can be logged when
- trying to send an outgoing relay cell with n_chan == 0. Diagnostic
- attempt for bug 23105.
- o Minor features (geoip):
- - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation):
- - Avoid compiler warnings in the unit tests for calling tor_sscanf()
- with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (controller):
- - Do not crash when receiving a HSPOST command with an empty body.
- Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- - Do not crash when receiving a POSTDESCRIPTOR command with an empty
- body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (relay):
- - Inform the geoip and rephist modules about all requests, even on
- relays that are only fetching microdescriptors. Fixes a bug
- related to 21585; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (unit tests):
- - Fix a channelpadding unit test failure on slow systems by using
- mocked time instead of actual time. Fixes bug 23077; bugfix
- on 0.3.1.1-alpha.
- Changes in version 0.3.1.6-rc - 2017-09-05
- Tor 0.3.1.6-rc fixes a few small bugs and annoyances in the 0.3.1
- release series, including a bug that produced weird behavior on
- Windows directory caches.
- This is the first release candidate in the Tor 0.3.1 series. If we
- find no new bugs or regressions here, the first stable 0.3.1 release
- will be nearly identical to it.
- o Major bugfixes (windows, directory cache):
- - On Windows, do not try to delete cached consensus documents and
- diffs before they are unmapped from memory--Windows won't allow
- that. Instead, allow the consensus cache directory to grow larger,
- to hold files that might need to stay around longer. Fixes bug
- 22752; bugfix on 0.3.1.1-alpha.
- o Minor features (directory authority):
- - Improve the message that authorities report to relays that present
- RSA/Ed25519 keypairs that conflict with previously pinned keys.
- Closes ticket 22348.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 3 2017 Maxmind GeoLite2
- Country database.
- o Minor features (testing):
- - Add more tests for compression backend initialization. Closes
- ticket 22286.
- o Minor bugfixes (directory cache):
- - Fix a memory leak when recovering space in the consensus cache.
- Fixes bug 23139; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (hidden service):
- - Increase the number of circuits that a service is allowed to
- open over a specific period of time. The value was lower than it
- should be (8 vs 12) in the normal case of 3 introduction points.
- Fixes bug 22159; bugfix on 0.3.0.5-rc.
- - Fix a BUG warning during HSv3 descriptor decoding that could be
- cause by a specially crafted descriptor. Fixes bug 23233; bugfix
- on 0.3.0.1-alpha. Bug found by "haxxpop".
- - Rate-limit the log messages if we exceed the maximum number of
- allowed intro circuits. Fixes bug 22159; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (logging, relay):
- - Remove a forgotten debugging message when an introduction point
- successfully establishes a hidden service prop224 circuit with
- a client.
- - Change three other log_warn() for an introduction point to
- protocol warnings, because they can be failure from the network
- and are not relevant to the operator. Fixes bug 23078; bugfix on
- 0.3.0.1-alpha and 0.3.0.2-alpha.
- o Minor bugfixes (relay):
- - When a relay is not running as a directory cache, it will no
- longer generate compressed consensuses and consensus diff
- information. Previously, this was a waste of disk and CPU. Fixes
- bug 23275; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (robustness, error handling):
- - Improve our handling of the cases where OpenSSL encounters a
- memory error while encoding keys and certificates. We haven't
- observed these errors in the wild, but if they do happen, we now
- detect and respond better. Fixes bug 19418; bugfix on all versions
- of Tor. Reported by Guido Vranken.
- o Minor bugfixes (stability):
- - Avoid crashing on a double-free when unable to load or process an
- included file. Fixes bug 23155; bugfix on 0.3.1.1-alpha. Found
- with the clang static analyzer.
- o Minor bugfixes (testing):
- - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
- bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- - Port the hs_ntor handshake test to work correctly with recent
- versions of the pysha3 module. Fixes bug 23071; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (Windows service):
- - When running as a Windows service, set the ID of the main thread
- correctly. Failure to do so made us fail to send log messages to
- the controller in 0.2.1.16-rc, slowed down controller event
- delivery in 0.2.7.3-rc and later, and crash with an assertion
- failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
- Patch and diagnosis from "Vort".
- Changes in version 0.3.0.10 - 2017-08-02
- Tor 0.3.0.10 backports a collection of small-to-medium bugfixes
- from the current Tor alpha series. OpenBSD users and TPROXY users
- should upgrade; others are probably okay sticking with 0.3.0.9.
- o Major features (build system, continuous integration, backport from 0.3.1.5-alpha):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
- - Fix a typo that had prevented TPROXY-based transparent proxying
- from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
- Patch from "d4fq0fQAgoJ".
- o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xbar" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Minor features (backport from 0.3.1.5-alpha):
- - Update geoip and geoip6 to the July 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (bandwidth accounting, backport from 0.3.1.2-alpha):
- - Roll over monthly accounting at the configured hour and minute,
- rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
- Found by Andrey Karpov with PVS-Studio.
- o Minor bugfixes (compilation warnings, backport from 0.3.1.5-alpha):
- - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
- bugfix on 0.2.8.1-alpha.
- - Fix warnings when building with libscrypt and openssl scrypt
- support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- - When building with certain versions of the mingw C header files,
- avoid float-conversion warnings when calling the C functions
- isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- - Backport a fix for an "unused variable" warning that appeared
- in some versions of mingw. Fixes bug 22838; bugfix on
- 0.2.8.1-alpha.
- o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
- - Avoid Coverity build warnings related to our BUG() macro. By
- default, Coverity treats BUG() as the Linux kernel does: an
- instant abort(). We need to override that so our BUG() macro
- doesn't prevent Coverity from analyzing functions that use it.
- Fixes bug 23030; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (directory authority, backport from 0.3.1.1-alpha):
- - When rejecting a router descriptor for running an obsolete version
- of Tor without ntor support, warn about the obsolete tor version,
- not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
- - Avoid a sandbox failure when trying to re-bind to a socket and
- mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (unit tests, backport from 0.3.1.5-alpha)
- - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
- Fixes bug 22803; bugfix on 0.3.0.1-alpha.
- Changes in version 0.3.1.5-alpha - 2017-08-01
- Tor 0.3.1.5-alpha improves the performance of consensus diff
- calculation, fixes a crash bug on older versions of OpenBSD, and fixes
- several other bugs. If no serious bugs are found in this version, the
- next version will be a release candidate.
- This release also marks the end of support for the Tor 0.2.4.x,
- 0.2.6.x, and 0.2.7.x release series. Those releases will receive no
- further bug or security fixes. Anyone still running or distributing
- one of those versions should upgrade.
- o Major features (build system, continuous integration):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- o Major bugfixes (openbsd, denial-of-service):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xbar" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Major bugfixes (relay, performance):
- - Perform circuit handshake operations at a higher priority than we
- use for consensus diff creation and compression. This should
- prevent circuits from starving when a relay or bridge receives a
- new consensus, especially on lower-powered machines. Fixes bug
- 22883; bugfix on 0.3.1.1-alpha.
- o Minor features (bridge authority):
- - Add "fingerprint" lines to the networkstatus-bridges file produced
- by bridge authorities. Closes ticket 22207.
- o Minor features (directory cache, consensus diff):
- - Add a new MaxConsensusAgeForDiffs option to allow directory cache
- operators with low-resource environments to adjust the number of
- consensuses they'll store and generate diffs from. Most cache
- operators should leave it unchanged. Helps to work around
- bug 22883.
- o Minor features (geoip):
- - Update geoip and geoip6 to the July 4 2017 Maxmind GeoLite2
- Country database.
- o Minor features (relay, performance):
- - Always start relays with at least two worker threads, to prevent
- priority inversion on slow tasks. Part of the fix for bug 22883.
- - Allow background work to be queued with different priorities, so
- that a big pile of slow low-priority jobs will not starve out
- higher priority jobs. This lays the groundwork for a fix for
- bug 22883.
- o Minor bugfixes (build system, rust):
- - Fix a problem where Rust toolchains were not being found when
- building without --enable-cargo-online-mode, due to setting the
- $HOME environment variable instead of $CARGO_HOME. Fixes bug
- 22830; bugfix on 0.3.1.1-alpha. Fix by Chelsea Komlo.
- o Minor bugfixes (compatibility, zstd):
- - Write zstd epilogues correctly when the epilogue requires
- reallocation of the output buffer, even with zstd 1.3.0.
- (Previously, we worked on 1.2.0 and failed with 1.3.0). Fixes bug
- 22927; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (compilation warnings):
- - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug
- 22915; bugfix on 0.2.8.1-alpha.
- - Fix warnings when building with libscrypt and openssl scrypt
- support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- - Compile correctly when both openssl 1.1.0 and libscrypt are
- detected. Previously this would cause an error. Fixes bug 22892;
- bugfix on 0.3.1.1-alpha.
- - When building with certain versions of the mingw C header files,
- avoid float-conversion warnings when calling the C functions
- isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (coverity build support):
- - Avoid Coverity build warnings related to our BUG() macro. By
- default, Coverity treats BUG() as the Linux kernel does: an
- instant abort(). We need to override that so our BUG() macro
- doesn't prevent Coverity from analyzing functions that use it.
- Fixes bug 23030; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (directory authority):
- - When a directory authority rejects a descriptor or extrainfo with
- a given digest, mark that digest as undownloadable, so that we do
- not attempt to download it again over and over. We previously
- tried to avoid downloading such descriptors by other means, but we
- didn't notice if we accidentally downloaded one anyway. This
- behavior became problematic in 0.2.7.2-alpha, when authorities
- began pinning Ed25519 keys. Fixes bug 22349; bugfix
- on 0.2.1.19-alpha.
- o Minor bugfixes (error reporting, windows):
- - When formatting Windows error messages, use the English format to
- avoid codepage issues. Fixes bug 22520; bugfix on 0.1.2.8-alpha.
- Patch from "Vort".
- o Minor bugfixes (file limits, osx):
- - When setting the maximum number of connections allowed by the OS,
- always allow some extra file descriptors for other files. Fixes
- bug 22797; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (linux seccomp2 sandbox):
- - Avoid a sandbox failure when trying to re-bind to a socket and
- mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (memory leaks):
- - Fix a small memory leak when validating a configuration that uses
- two or more AF_UNIX sockets for the same port type. Fixes bug
- 23053; bugfix on 0.2.6.3-alpha. This is CID 1415725.
- o Minor bugfixes (unit tests):
- - test_consdiff_base64cmp would fail on OS X because while OS X
- follows the standard of (less than zero/zero/greater than zero),
- it doesn't follow the convention of (-1/0/+1). Make the test
- comply with the standard. Fixes bug 22870; bugfix on 0.3.1.1-alpha.
- - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
- Fixes bug 22803; bugfix on 0.3.0.1-alpha.
- Changes in version 0.3.1.4-alpha - 2017-06-29
- Tor 0.3.1.4-alpha fixes a path selection bug that would allow a client
- to use a guard that was in the same network family as a chosen exit
- relay. This is a security regression; all clients running earlier
- versions of 0.3.0.x or 0.3.1.x should upgrade to 0.3.0.9
- or 0.3.1.4-alpha.
- This release also fixes several other bugs introduced in 0.3.0.x
- and 0.3.1.x, including others that can affect bandwidth usage
- and correctness.
- o New dependencies:
- - To build with zstd and lzma support, Tor now requires the
- pkg-config tool at build time. (This requirement was new in
- 0.3.1.1-alpha, but was not noted at the time. Noting it here to
- close ticket 22623.)
- o Major bugfixes (path selection, security):
- - When choosing which guard to use for a circuit, avoid the exit's
- family along with the exit itself. Previously, the new guard
- selection logic avoided the exit, but did not consider its family.
- Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
- 006 and CVE-2017-0377.
- o Major bugfixes (compression, zstd):
- - Correctly detect a full buffer when decompressing a large zstd-
- compressed input. Previously, we would sometimes treat a full
- buffer as an error. Fixes bug 22628; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (directory protocol):
- - Ensure that we send "304 Not modified" as HTTP status code when a
- client is attempting to fetch a consensus or consensus diff, and
- the best one we can send them is one they already have. Fixes bug
- 22702; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (entry guards):
- - When starting with an old consensus, do not add new entry guards
- unless the consensus is "reasonably live" (under 1 day old). Fixes
- one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
- o Minor features (bug mitigation, diagnostics, logging):
- - Avoid an assertion failure, and log a better error message, when
- unable to remove a file from the consensus cache on Windows.
- Attempts to mitigate and diagnose bug 22752.
- o Minor features (geoip):
- - Update geoip and geoip6 to the June 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compression):
- - When compressing or decompressing a buffer, check for a failure to
- create a compression object. Fixes bug 22626; bugfix
- on 0.3.1.1-alpha.
- - When decompressing a buffer, check for extra data after the end of
- the compressed data. Fixes bug 22629; bugfix on 0.3.1.1-alpha.
- - When decompressing an object received over an anonymous directory
- connection, if we have already decompressed it using an acceptable
- compression method, do not reject it for looking like an
- unacceptable compression method. Fixes part of bug 22670; bugfix
- on 0.3.1.1-alpha.
- - When serving directory votes compressed with zlib, do not claim to
- have compressed them with zstd. Fixes bug 22669; bugfix
- on 0.3.1.1-alpha.
- - When spooling compressed data to an output buffer, don't try to
- spool more data when there is no more data to spool and we are not
- trying to flush the input. Previously, we would sometimes launch
- compression requests with nothing to do, which interferes with our
- 22672 checks. Fixes bug 22719; bugfix on 0.2.0.16-alpha.
- o Minor bugfixes (defensive programming):
- - Detect and break out of infinite loops in our compression code. We
- don't think that any such loops exist now, but it's best to be
- safe. Closes ticket 22672.
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- o Minor bugfixes (linux seccomp2 sandbox):
- - Permit the fchmod system call, to avoid crashing on startup when
- starting with the seccomp2 sandbox and an unexpected set of
- permissions on the data directory or its contents. Fixes bug
- 22516; bugfix on 0.2.5.4-alpha.
- - Fix a crash in the LZMA module, when the sandbox was enabled, and
- liblzma would allocate more than 16 MB of memory. We solve this by
- bumping the mprotect() limit in the sandbox module from 16 MB to
- 20 MB. Fixes bug 22751; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (logging):
- - When decompressing, do not warn if we fail to decompress using a
- compression method that we merely guessed. Fixes part of bug
- 22670; bugfix on 0.1.1.14-alpha.
- - When decompressing, treat mismatch between content-encoding and
- actual compression type as a protocol warning. Fixes part of bug
- 22670; bugfix on 0.1.1.9-alpha.
- - Downgrade "assigned_to_cpuworker failed" message to info-level
- severity. In every case that can reach it, either a better warning
- has already been logged, or no warning is warranted. Fixes bug
- 22356; bugfix on 0.2.6.3-alpha.
- - Demote a warn that was caused by libevent delays to info if
- netflow padding is less than 4.5 seconds late, or to notice
- if it is more (4.5 seconds is the amount of time that a netflow
- record might be emitted after, if we chose the maximum timeout).
- Fixes bug 22212; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (process behavior):
- - When exiting because of an error, always exit with a nonzero exit
- status. Previously, we would fail to report an error in our exit
- status in cases related to __OwningControllerProcess failure,
- lockfile contention, and Ed25519 key initialization. Fixes bug
- 22720; bugfix on versions 0.2.1.6-alpha, 0.2.2.28-beta, and
- 0.2.7.2-alpha respectively. Reported by "f55jwk4f"; patch
- from "huyvq".
- o Documentation:
- - Add a manpage description for the key-pinning-journal file. Closes
- ticket 22347.
- - Correctly note that bandwidth accounting values are stored in the
- state file, and the bw_accounting file is now obsolete. Closes
- ticket 16082.
- - Document more of the files in the Tor data directory, including
- cached-extrainfo, secret_onion_key{,_ntor}.old, hidserv-stats,
- approved-routers, sr-random, and diff-cache. Found while fixing
- ticket 22347.
- Changes in version 0.3.0.9 - 2017-06-29
- Tor 0.3.0.9 fixes a path selection bug that would allow a client
- to use a guard that was in the same network family as a chosen exit
- relay. This is a security regression; all clients running earlier
- versions of 0.3.0.x or 0.3.1.x should upgrade to 0.3.0.9 or
- 0.3.1.4-alpha.
- This release also backports several other bugfixes from the 0.3.1.x
- series.
- o Major bugfixes (path selection, security, backport from 0.3.1.4-alpha):
- - When choosing which guard to use for a circuit, avoid the exit's
- family along with the exit itself. Previously, the new guard
- selection logic avoided the exit, but did not consider its family.
- Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
- 006 and CVE-2017-0377.
- o Major bugfixes (entry guards, backport from 0.3.1.1-alpha):
- - Don't block bootstrapping when a primary bridge is offline and we
- can't get its descriptor. Fixes bug 22325; fixes one case of bug
- 21969; bugfix on 0.3.0.3-alpha.
- o Major bugfixes (entry guards, backport from 0.3.1.4-alpha):
- - When starting with an old consensus, do not add new entry guards
- unless the consensus is "reasonably live" (under 1 day old). Fixes
- one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the June 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
- - Reject version numbers with non-numeric prefixes (such as +, -, or
- whitespace). Disallowing whitespace prevents differential version
- parsing between POSIX-based and Windows platforms. Fixes bug 21507
- and part of 21508; bugfix on 0.0.8pre1.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
- - Permit the fchmod system call, to avoid crashing on startup when
- starting with the seccomp2 sandbox and an unexpected set of
- permissions on the data directory or its contents. Fixes bug
- 22516; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (defensive programming, backport from 0.3.1.4-alpha):
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- Changes in version 0.3.1.3-alpha - 2017-06-08
- Tor 0.3.1.3-alpha fixes a pair of bugs that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-004 and TROVE-2017-005.
- Tor 0.3.1.3-alpha also includes fixes for several key management bugs
- that sometimes made relays unreliable, as well as several other
- bugfixes described below.
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure when a hidden service
- handles a malformed BEGIN cell. Fixes bug 22493, tracked as
- TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Major bugfixes (relay, link handshake):
- - When performing the v3 link handshake on a TLS connection, report
- that we have the x509 certificate that we actually used on that
- connection, even if we have changed certificates since that
- connection was first opened. Previously, we would claim to have
- used our most recent x509 link certificate, which would sometimes
- make the link handshake fail. Fixes one case of bug 22460; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (relays, key management):
- - Regenerate link and authentication certificates whenever the key
- that signs them changes; also, regenerate link certificates
- whenever the signed key changes. Previously, these processes were
- only weakly coupled, and we relays could (for minutes to hours)
- wind up with an inconsistent set of keys and certificates, which
- other relays would not accept. Fixes two cases of bug 22460;
- bugfix on 0.3.0.1-alpha.
- - When sending an Ed25519 signing->link certificate in a CERTS cell,
- send the certificate that matches the x509 certificate that we
- used on the TLS connection. Previously, there was a race condition
- if the TLS context rotated after we began the TLS handshake but
- before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
- on 0.3.0.1-alpha.
- o Major bugfixes (torrc, crash):
- - Fix a crash bug when using %include in torrc. Fixes bug 22417;
- bugfix on 0.3.1.1-alpha. Patch by Daniel Pinto.
- o Minor features (code style):
- - Add "Falls through" comments to our codebase, in order to silence
- GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
- Stieger. Closes ticket 22446.
- o Minor features (diagnostic):
- - Add logging messages to try to diagnose a rare bug that seems to
- generate RSA->Ed25519 cross-certificates dated in the 1970s. We
- think this is happening because of incorrect system clocks, but
- we'd like to know for certain. Diagnostic for bug 22466.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- o Minor bugfixes (directory protocol):
- - Check for libzstd >= 1.1, because older versions lack the
- necessary streaming API. Fixes bug 22413; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (link handshake):
- - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
- months, and regenerate it when it is within one month of expiring.
- Previously, we had generated this certificate at startup with a
- ten-year lifetime, but that could lead to weird behavior when Tor
- was started with a grossly inaccurate clock. Mitigates bug 22466;
- mitigation on 0.3.0.1-alpha.
- o Minor bugfixes (storage directories):
- - Always check for underflows in the cached storage directory usage.
- If the usage does underflow, re-calculate it. Also, avoid a
- separate underflow when the usage is not known. Fixes bug 22424;
- bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (unit tests):
- - The unit tests now pass on systems where localhost is misconfigured
- to some IPv4 address other than 127.0.0.1. Fixes bug 6298; bugfix
- on 0.0.9pre2.
- o Documentation:
- - Clarify the manpage for the (deprecated) torify script. Closes
- ticket 6892.
- Changes in version 0.3.0.8 - 2017-06-08
- Tor 0.3.0.8 fixes a pair of bugs that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-004 and TROVE-2017-005.
- Tor 0.3.0.8 also includes fixes for several key management bugs
- that sometimes made relays unreliable, as well as several other
- bugfixes described below.
- o Major bugfixes (hidden service, relay, security, backport
- from 0.3.1.3-alpha):
- - Fix a remotely triggerable assertion failure when a hidden service
- handles a malformed BEGIN cell. Fixes bug 22493, tracked as
- TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
- - When performing the v3 link handshake on a TLS connection, report
- that we have the x509 certificate that we actually used on that
- connection, even if we have changed certificates since that
- connection was first opened. Previously, we would claim to have
- used our most recent x509 link certificate, which would sometimes
- make the link handshake fail. Fixes one case of bug 22460; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (relays, key management, backport from 0.3.1.3-alpha):
- - Regenerate link and authentication certificates whenever the key
- that signs them changes; also, regenerate link certificates
- whenever the signed key changes. Previously, these processes were
- only weakly coupled, and we relays could (for minutes to hours)
- wind up with an inconsistent set of keys and certificates, which
- other relays would not accept. Fixes two cases of bug 22460;
- bugfix on 0.3.0.1-alpha.
- - When sending an Ed25519 signing->link certificate in a CERTS cell,
- send the certificate that matches the x509 certificate that we
- used on the TLS connection. Previously, there was a race condition
- if the TLS context rotated after we began the TLS handshake but
- before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
- on 0.3.0.1-alpha.
- o Major bugfixes (hidden service v3, backport from 0.3.1.1-alpha):
- - Stop rejecting v3 hidden service descriptors because their size
- did not match an old padding rule. Fixes bug 22447; bugfix on
- 0.3.0.1-alpha.
- o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
- December 2016 (of which ~126 were still functional) with a list of
- 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
- 2017. Resolves ticket 21564.
- o Minor bugfixes (configuration, backport from 0.3.1.1-alpha):
- - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
- bug 22252; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- o Minor bugfixes (link handshake, backport from 0.3.1.3-alpha):
- - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
- months, and regenerate it when it is within one month of expiring.
- Previously, we had generated this certificate at startup with a
- ten-year lifetime, but that could lead to weird behavior when Tor
- was started with a grossly inaccurate clock. Mitigates bug 22466;
- mitigation on 0.3.0.1-alpha.
- o Minor bugfixes (memory leak, directory authority, backport from
- 0.3.1.2-alpha):
- - When directory authorities reject a router descriptor due to
- keypinning, free the router descriptor rather than leaking the
- memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
- Changes in version 0.2.9.11 - 2017-06-08
- Tor 0.2.9.11 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- Tor 0.2.9.11 also backports fixes for several key management bugs
- that sometimes made relays unreliable, as well as several other
- bugfixes described below.
- o Major bugfixes (hidden service, relay, security, backport
- from 0.3.1.3-alpha):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
- - When performing the v3 link handshake on a TLS connection, report
- that we have the x509 certificate that we actually used on that
- connection, even if we have changed certificates since that
- connection was first opened. Previously, we would claim to have
- used our most recent x509 link certificate, which would sometimes
- make the link handshake fail. Fixes one case of bug 22460; bugfix
- on 0.2.3.6-alpha.
- o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
- December 2016 (of which ~126 were still functional) with a list of
- 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
- 2017. Resolves ticket 21564.
- o Minor features (future-proofing, backport from 0.3.0.7):
- - Tor no longer refuses to download microdescriptors or descriptors if
- they are listed as "published in the future". This change will
- eventually allow us to stop listing meaningful "published" dates
- in microdescriptor consensuses, and thereby allow us to reduce the
- resources required to download consensus diffs by over 50%.
- Implements part of ticket 21642; implements part of proposal 275.
- o Minor features (directory authorities, backport from 0.3.0.4-rc)
- - Directory authorities now reject relays running versions
- 0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
- suffer from bug 20499 and don't keep their consensus cache
- up-to-date. Resolves ticket 20509.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (control port, backport from 0.3.0.6):
- - The GETINFO extra-info/digest/<digest> command was broken because
- of a wrong base16 decode return value check, introduced when
- refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.0.7):
- - The getpid() system call is now permitted under the Linux seccomp2
- sandbox, to avoid crashing with versions of OpenSSL (and other
- libraries) that attempt to learn the process's PID by using the
- syscall rather than the VDSO code. Fixes bug 21943; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (memory leak, directory authority, backport
- from 0.3.1.2-alpha):
- - When directory authorities reject a router descriptor due to
- keypinning, free the router descriptor rather than leaking the
- memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
- Changes in version 0.2.8.14 - 2017-06-08
- Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
- December 2016 (of which ~126 were still functional) with a list of
- 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
- 2017. Resolves ticket 21564.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.2.7.8 - 2017-06-08
- Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.2.6.12 - 2017-06-08
- Tor 0.2.6.12 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.2.5.14 - 2017-06-08
- Tor 0.2.5.14 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.2.4.29 - 2017-06-08
- Tor 0.2.4.29 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.3.1.2-alpha - 2017-05-26
- Tor 0.3.1.2-alpha is the second release in the 0.3.1.x series. It
- fixes a few bugs found while testing 0.3.1.1-alpha, including a
- memory corruption bug that affected relay stability.
- o Major bugfixes (crash, relay):
- - Fix a memory-corruption bug in relays that set MyFamily.
- Previously, they would double-free MyFamily elements when making
- the next descriptor or when changing their configuration. Fixes
- bug 22368; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (logging):
- - Log a better message when a directory authority replies to an
- upload with an unexpected status code. Fixes bug 11121; bugfix
- on 0.1.0.1-rc.
- o Minor bugfixes (memory leak, directory authority):
- - When directory authorities reject a router descriptor due to
- keypinning, free the router descriptor rather than leaking the
- memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
- Changes in version 0.3.1.1-alpha - 2017-05-22
- Tor 0.3.1.1-alpha is the first release in the 0.3.1.x series. It
- reduces the bandwidth usage for Tor's directory protocol, adds some
- basic padding to resist netflow-based traffic analysis and to serve as
- the basis of other padding in the future, and adds rust support to the
- build system.
- It also contains numerous other small features and improvements to
- security, correctness, and performance.
- Below are the changes since 0.3.0.7.
- o Major features (directory protocol):
- - Tor relays and authorities can now serve clients an abbreviated
- version of the consensus document, containing only the changes
- since an older consensus document that the client holds. Clients
- now request these documents when available. When both client and
- server use this new protocol, they will use far less bandwidth (up
- to 94% less) to keep the client's consensus up-to-date. Implements
- proposal 140; closes ticket 13339. Based on work by Daniel Martí.
- - Tor can now compress directory traffic with lzma or with zstd
- compression algorithms, which can deliver better bandwidth
- performance. Because lzma is computationally expensive, it's only
- used for documents that can be compressed once and served many
- times. Support for these algorithms requires that tor is built
- with the libzstd and/or liblzma libraries available. Implements
- proposal 278; closes ticket 21662.
- - Relays now perform the more expensive compression operations, and
- consensus diff generation, in worker threads. This separation
- avoids delaying the main thread when a new consensus arrives.
- o Major features (experimental):
- - Tor can now build modules written in Rust. To turn this on, pass
- the "--enable-rust" flag to the configure script. It's not time to
- get excited yet: currently, there is no actual Rust functionality
- beyond some simple glue code, and a notice at startup to tell you
- that Rust is running. Still, we hope that programmers and
- packagers will try building Tor with Rust support, so that we can
- find issues and solve portability problems. Closes ticket 22106.
- o Major features (traffic analysis resistance):
- - Connections between clients and relays now send a padding cell in
- each direction every 1.5 to 9.5 seconds (tunable via consensus
- parameters). This padding will not resist specialized
- eavesdroppers, but it should be enough to make many ISPs' routine
- network flow logging less useful in traffic analysis against
- Tor users.
- Padding is negotiated using Tor's link protocol, so both relays
- and clients must upgrade for this to take effect. Clients may
- still send padding despite the relay's version by setting
- ConnectionPadding 1 in torrc, and may disable padding by setting
- ConnectionPadding 0 in torrc. Padding may be minimized for mobile
- users with the torrc option ReducedConnectionPadding. Implements
- Proposal 251 and Section 2 of Proposal 254; closes ticket 16861.
- - Relays will publish 24 hour totals of padding and non-padding cell
- counts to their extra-info descriptors, unless PaddingStatistics 0
- is set in torrc. These 24 hour totals are also rounded to
- multiples of 10000.
- o Major bugfixes (connection usage):
- - We use NETINFO cells to try to determine if both relays involved
- in a connection will agree on the canonical status of that
- connection. We prefer the connections where this is the case for
- extend cells, and try to close connections where relays disagree
- on their canonical status early. Also, we now prefer the oldest
- valid connection for extend cells. These two changes should reduce
- the number of long-term connections that are kept open between
- relays. Fixes bug 17604; bugfix on 0.2.5.5-alpha.
- - Relays now log hourly statistics (look for
- "channel_check_for_duplicates" lines) on the total number of
- connections to other relays. If the number of connections per
- relay is unexpectedly large, this log message is at notice level.
- Otherwise it is at info.
- o Major bugfixes (entry guards):
- - Don't block bootstrapping when a primary bridge is offline and we
- can't get its descriptor. Fixes bug 22325; fixes one case of bug
- 21969; bugfix on 0.3.0.3-alpha.
- o Major bugfixes (linux TPROXY support):
- - Fix a typo that had prevented TPROXY-based transparent proxying
- from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
- Patch from "d4fq0fQAgoJ".
- o Minor features (security, windows):
- - Enable a couple of pieces of Windows hardening: one
- (HeapEnableTerminationOnCorruption) that has been on-by-default
- since Windows 8, and unavailable before Windows 7; and one
- (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
- affect us, but shouldn't do any harm. Closes ticket 21953.
- o Minor features (config options):
- - Allow "%include" directives in torrc configuration files. These
- directives import the settings from other files, or from all the
- files in a directory. Closes ticket 1922. Code by Daniel Pinto.
- - Make SAVECONF return an error when overwriting a torrc that has
- includes. Using SAVECONF with the FORCE option will allow it to
- overwrite torrc even if includes are used. Related to ticket 1922.
- - Add "GETINFO config-can-saveconf" to tell controllers if SAVECONF
- will work without the FORCE option. Related to ticket 1922.
- o Minor features (controller):
- - Warn the first time that a controller requests data in the long-
- deprecated 'GETINFO network-status' format. Closes ticket 21703.
- o Minor features (defaults):
- - The default value for UseCreateFast is now 0: clients which
- haven't yet received a consensus document will now use a proper
- ntor handshake to talk to their directory servers whenever they
- can. Closes ticket 21407.
- - Onion key rotation and expiry intervals are now defined as a
- network consensus parameter, per proposal 274. The default
- lifetime of an onion key is increased from 7 to 28 days. Old onion
- keys will expire after 7 days by default. This change will make
- consensus diffs much smaller, and save significant bandwidth.
- Closes ticket 21641.
- o Minor features (fallback directory list):
- - Update the fallback directory mirror whitelist and blacklist based
- on operator emails. Closes task 21121.
- - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
- December 2016 (of which ~126 were still functional) with a list of
- 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
- 2017. Resolves ticket 21564.
- o Minor features (hidden services, logging):
- - Log a message when a hidden service descriptor has fewer
- introduction points than specified in
- HiddenServiceNumIntroductionPoints. Closes tickets 21598.
- - Log a message when a hidden service reaches its introduction point
- circuit limit, and when that limit is reset. Follow up to ticket
- 21594; closes ticket 21622.
- - Warn user if multiple entries in EntryNodes and at least one
- HiddenService are used together. Pinning EntryNodes along with a
- hidden service can be possibly harmful; for instance see ticket
- 14917 or 21155. Closes ticket 21155.
- o Minor features (linux seccomp2 sandbox):
- - We now have a document storage backend compatible with the Linux
- seccomp2 sandbox. This backend is used for consensus documents and
- diffs between them; in the long term, we'd like to use it for
- unparseable directory material too. Closes ticket 21645
- - Increase the maximum allowed size passed to mprotect(PROT_WRITE)
- from 1MB to 16MB. This was necessary with the glibc allocator in
- order to allow worker threads to allocate more memory -- which in
- turn is necessary because of our new use of worker threads for
- compression. Closes ticket 22096.
- o Minor features (logging):
- - Log files are no longer created world-readable by default.
- (Previously, most distributors would store the logs in a non-
- world-readable location to prevent inappropriate access. This
- change is an extra precaution.) Closes ticket 21729; patch
- from toralf.
- o Minor features (performance):
- - Our Keccak (SHA-3) implementation now accesses memory more
- efficiently, especially on little-endian systems. Closes
- ticket 21737.
- - Add an O(1) implementation of channel_find_by_global_id(), to
- speed some controller functions.
- o Minor features (relay, configuration):
- - The MyFamily option may now be repeated as many times as desired,
- for relays that want to configure large families. Closes ticket
- 4998; patch by Daniel Pinto.
- o Minor features (safety):
- - Add an explicit check to extrainfo_parse_entry_from_string() for
- NULL inputs. We don't believe this can actually happen, but it may
- help silence a warning from the Clang analyzer. Closes
- ticket 21496.
- o Minor features (testing):
- - Add a "--disable-memory-sentinels" feature to help with fuzzing.
- When Tor is compiled with this option, we disable a number of
- redundant memory-safety failsafes that are intended to stop bugs
- from becoming security issues. This makes it easier to hunt for
- bugs that would be security issues without the failsafes turned
- on. Closes ticket 21439.
- - Add a general event-tracing instrumentation support to Tor. This
- subsystem will enable developers and researchers to add fine-
- grained instrumentation to their Tor instances, for use when
- examining Tor network performance issues. There are no trace
- events yet, and event-tracing is off by default unless enabled at
- compile time. Implements ticket 13802.
- - Improve our version parsing tests: add tests for typical version
- components, add tests for invalid versions, including numeric
- range and non-numeric prefixes. Unit tests 21278, 21450, and
- 21507. Partially implements 21470.
- o Minor bugfixes (bandwidth accounting):
- - Roll over monthly accounting at the configured hour and minute,
- rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
- Found by Andrey Karpov with PVS-Studio.
- o Minor bugfixes (code correctness):
- - Accurately identify client connections by their lack of peer
- authentication. This means that we bail out earlier if asked to
- extend to a client. Follow-up to 21407. Fixes bug 21406; bugfix
- on 0.2.4.23.
- o Minor bugfixes (configuration):
- - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
- bug 22252; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (connection lifespan):
- - Allow more control over how long TLS connections are kept open:
- unify CircuitIdleTimeout and PredictedPortsRelevanceTime into a
- single option called CircuitsAvailableTimeout. Also, allow the
- consensus to control the default values for both this preference
- and the lifespan of relay-to-relay connections. Fixes bug 17592;
- bugfix on 0.2.5.5-alpha.
- - Increase the initial circuit build timeout testing frequency, to
- help ensure that ReducedConnectionPadding clients finish learning
- a timeout before their orconn would expire. The initial testing
- rate was set back in the days of TAP and before the Tor Browser
- updater, when we had to be much more careful about new clients
- making lots of circuits. With this change, a circuit build timeout
- is learned in about 15-20 minutes, instead of 100-120 minutes.
- o Minor bugfixes (controller):
- - GETINFO onions/current and onions/detached no longer respond with
- 551 on empty lists. Fixes bug 21329; bugfix on 0.2.7.1-alpha.
- - Trigger HS descriptor events on the control port when the client
- fails to pick a hidden service directory for a hidden service.
- This can happen if all the hidden service directories are in
- ExcludeNodes, or they have all been queried within the last 15
- minutes. Fixes bug 22042; bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (directory authority):
- - When rejecting a router descriptor for running an obsolete version
- of Tor without ntor support, warn about the obsolete tor version,
- not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
- - Prevent the shared randomness subsystem from asserting when
- initialized by a bridge authority with an incomplete configuration
- file. Fixes bug 21586; bugfix on 0.2.9.8.
- o Minor bugfixes (exit-side DNS):
- - Fix an untriggerable assertion that checked the output of a
- libevent DNS error, so that the assertion actually behaves as
- expected. Fixes bug 22244; bugfix on 0.2.0.20-rc. Found by Andrey
- Karpov using PVS-Studio.
- o Minor bugfixes (fallback directories):
- - Make the usage example in updateFallbackDirs.py actually work, and
- explain what it does. Fixes bug 22270; bugfix on 0.3.0.3-alpha.
- - Decrease the guard flag average required to be a fallback. This
- allows us to keep relays that have their guard flag removed when
- they restart. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
- - Decrease the minimum number of fallbacks to 100. Fixes bug 20913;
- bugfix on 0.2.8.1-alpha.
- - Make sure fallback directory mirrors have the same address, port,
- and relay identity key for at least 30 days before they are
- selected. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (hidden services):
- - Stop printing a cryptic warning when a hidden service gets a
- request to connect to a virtual port that it hasn't configured.
- Fixes bug 16706; bugfix on 0.2.6.3-alpha.
- - Simplify hidden service descriptor creation by using an existing
- flag to check if an introduction point is established. Fixes bug
- 21599; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (memory leak):
- - Fix a small memory leak at exit from the backtrace handler code.
- Fixes bug 21788; bugfix on 0.2.5.2-alpha. Patch from Daniel Pinto.
- o Minor bugfixes (protocol, logging):
- - Downgrade a log statement about unexpected relay cells from "bug"
- to "protocol warning", because there is at least one use case
- where it can be triggered by a buggy tor implementation. Fixes bug
- 21293; bugfix on 0.1.1.14-alpha.
- o Minor bugfixes (testing):
- - Use unbuffered I/O for utility functions around the
- process_handle_t type. This fixes unit test failures reported on
- OpenBSD and FreeBSD. Fixes bug 21654; bugfix on 0.2.3.1-alpha.
- - Make display of captured unit test log messages consistent. Fixes
- bug 21510; bugfix on 0.2.9.3-alpha.
- - Make test-network.sh always call chutney's test-network.sh.
- Previously, this only worked on systems which had bash installed,
- due to some bash-specific code in the script. Fixes bug 19699;
- bugfix on 0.3.0.4-rc. Follow-up to ticket 21581.
- o Minor bugfixes (voting consistency):
- - Reject version numbers with non-numeric prefixes (such as +, -, or
- whitespace). Disallowing whitespace prevents differential version
- parsing between POSIX-based and Windows platforms. Fixes bug 21507
- and part of 21508; bugfix on 0.0.8pre1.
- o Minor bugfixes (windows, relay):
- - Resolve "Failure from drain_fd: No error" warnings on Windows
- relays. Fixes bug 21540; bugfix on 0.2.6.3-alpha.
- o Code simplification and refactoring:
- - Break up the 630-line function connection_dir_client_reached_eof()
- into a dozen smaller functions. This change should help
- maintainability and readability of the client directory code.
- - Isolate our use of the openssl headers so that they are only
- included from our crypto wrapper modules, and from tests that
- examine those modules' internals. Closes ticket 21841.
- - Simplify our API to launch directory requests, making it more
- extensible and less error-prone. Now it's easier to add extra
- headers to directory requests. Closes ticket 21646.
- - Our base64 decoding functions no longer overestimate the output
- space that they need when parsing unpadded inputs. Closes
- ticket 17868.
- - Remove unused "ROUTER_ADDED_NOTIFY_GENERATOR" internal value.
- Resolves ticket 22213.
- - The logic that directory caches use to spool request to clients,
- serving them one part at a time so as not to allocate too much
- memory, has been refactored for consistency. Previously there was
- a separate spooling implementation per type of spoolable data. Now
- there is one common spooling implementation, with extensible data
- types. Closes ticket 21651.
- - Tor's compression module now supports multiple backends. Part of
- the implementation for proposal 278; closes ticket 21663.
- o Documentation:
- - Clarify the behavior of the KeepAliveIsolateSOCKSAuth sub-option.
- Closes ticket 21873.
- - Correct documentation about the default DataDirectory value.
- Closes ticket 21151.
- - Document the default behavior of NumEntryGuards and
- NumDirectoryGuards correctly. Fixes bug 21715; bugfix
- on 0.3.0.1-alpha.
- - Document key=value pluggable transport arguments for Bridge lines
- in torrc. Fixes bug 20341; bugfix on 0.2.5.1-alpha.
- - Note that bandwidth-limiting options don't affect TCP headers or
- DNS. Closes ticket 17170.
- o Removed features (configuration options, all in ticket 22060):
- - These configuration options are now marked Obsolete, and no longer
- have any effect: AllowInvalidNodes, AllowSingleHopCircuits,
- AllowSingleHopExits, ExcludeSingleHopRelays, FastFirstHopPK,
- TLSECGroup, WarnUnsafeSocks. They were first marked as deprecated
- in 0.2.9.2-alpha and have now been removed. The previous default
- behavior is now always chosen; the previous (less secure) non-
- default behavior is now unavailable.
- - CloseHSClientCircuitsImmediatelyOnTimeout and
- CloseHSServiceRendCircuitsImmediatelyOnTimeout were deprecated in
- 0.2.9.2-alpha and now have been removed. HS circuits never close
- on circuit build timeout; they have a longer timeout period.
- - {Control,DNS,Dir,Socks,Trans,NATD,OR}ListenAddress were deprecated
- in 0.2.9.2-alpha and now have been removed. Use the ORPort option
- (and others) to configure listen-only and advertise-only addresses.
- o Removed features (tools):
- - We've removed the tor-checkkey tool from src/tools. Long ago, we
- used it to help people detect RSA keys that were generated by
- versions of Debian affected by CVE-2008-0166. But those keys have
- been out of circulation for ages, and this tool is no longer
- required. Closes ticket 21842.
- Changes in version 0.3.0.7 - 2017-05-15
- Tor 0.3.0.7 fixes a medium-severity security bug in earlier versions
- of Tor 0.3.0.x, where an attacker could cause a Tor relay process
- to exit. Relays running earlier versions of Tor 0.3.0.x should upgrade;
- clients are not affected.
- o Major bugfixes (hidden service directory, security):
- - Fix an assertion failure in the hidden service directory code, which
- could be used by an attacker to remotely cause a Tor relay process to
- exit. Relays running earlier versions of Tor 0.3.0.x should upgrade.
- should upgrade. This security issue is tracked as TROVE-2017-002.
- Fixes bug 22246; bugfix on 0.3.0.1-alpha.
- o Minor features:
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor features (future-proofing):
- - Tor no longer refuses to download microdescriptors or descriptors
- if they are listed as "published in the future". This change will
- eventually allow us to stop listing meaningful "published" dates
- in microdescriptor consensuses, and thereby allow us to reduce the
- resources required to download consensus diffs by over 50%.
- Implements part of ticket 21642; implements part of proposal 275.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - The getpid() system call is now permitted under the Linux seccomp2
- sandbox, to avoid crashing with versions of OpenSSL (and other
- libraries) that attempt to learn the process's PID by using the
- syscall rather than the VDSO code. Fixes bug 21943; bugfix
- on 0.2.5.1-alpha.
- Changes in version 0.3.0.6 - 2017-04-26
- Tor 0.3.0.6 is the first stable release of the Tor 0.3.0 series.
- With the 0.3.0 series, clients and relays now use Ed25519 keys to
- authenticate their link connections to relays, rather than the old
- RSA1024 keys that they used before. (Circuit crypto has been
- Curve25519-authenticated since 0.2.4.8-alpha.) We have also replaced
- the guard selection and replacement algorithm to behave more robustly
- in the presence of unreliable networks, and to resist guard-
- capture attacks.
- This series also includes numerous other small features and bugfixes,
- along with more groundwork for the upcoming hidden-services revamp.
- Per our stable release policy, we plan to support the Tor 0.3.0
- release series for at least the next nine months, or for three months
- after the first stable release of the 0.3.1 series: whichever is
- longer. If you need a release with long-term support, we recommend
- that you stay with the 0.2.9 series.
- Below are the changes since 0.3.0.5-rc. For a list of all changes
- since 0.2.9, see the ReleaseNotes file.
- o Minor features (geoip):
- - Update geoip and geoip6 to the April 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (control port):
- - The GETINFO extra-info/digest/<digest> command was broken because
- of a wrong base16 decode return value check, introduced when
- refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (crash prevention):
- - Fix a (currently untriggerable, but potentially dangerous) crash
- bug when base32-encoding inputs whose sizes are not a multiple of
- 5. Fixes bug 21894; bugfix on 0.2.9.1-alpha.
- Changes in version 0.3.0.5-rc - 2017-04-05
- Tor 0.3.0.5-rc fixes a few remaining bugs, large and small, in the
- 0.3.0 release series.
- This is the second release candidate in the Tor 0.3.0 series, and has
- much fewer changes than the first. If we find no new bugs or
- regressions here, the first stable 0.3.0 release will be nearly
- identical to it.
- o Major bugfixes (crash, directory connections):
- - Fix a rare crash when sending a begin cell on a circuit whose
- linked directory connection had already been closed. Fixes bug
- 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
- o Major bugfixes (guard selection):
- - Fix a guard selection bug where Tor would refuse to bootstrap in
- some cases if the user swapped a bridge for another bridge in
- their configuration file. Fixes bug 21771; bugfix on 0.3.0.1-alpha.
- Reported by "torvlnt33r".
- o Minor features (geoip):
- - Update geoip and geoip6 to the March 7 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfix (compilation):
- - Fix a warning when compiling hs_service.c. Previously, it had no
- exported symbols when compiled for libor.a, resulting in a
- compilation warning from clang. Fixes bug 21825; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (hidden services):
- - Make hidden services check for failed intro point connections,
- even when they have exceeded their intro point creation limit.
- Fixes bug 21596; bugfix on 0.2.7.2-alpha. Reported by Alec Muffett.
- - Make hidden services with 8 to 10 introduction points check for
- failed circuits immediately after startup. Previously, they would
- wait for 5 minutes before performing their first checks. Fixes bug
- 21594; bugfix on 0.2.3.9-alpha. Reported by Alec Muffett.
- o Minor bugfixes (memory leaks):
- - Fix a memory leak when using GETCONF on a port option. Fixes bug
- 21682; bugfix on 0.3.0.3-alpha.
- o Minor bugfixes (relay):
- - Avoid a double-marked-circuit warning that could happen when we
- receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
- on 0.1.0.1-rc.
- o Minor bugfixes (tests):
- - Run the entry_guard_parse_from_state_full() test with the time set
- to a specific date. (The guard state that this test was parsing
- contained guards that had expired since the test was first
- written.) Fixes bug 21799; bugfix on 0.3.0.1-alpha.
- o Documentation:
- - Update the description of the directory server options in the
- manual page, to clarify that a relay no longer needs to set
- DirPort in order to be a directory cache. Closes ticket 21720.
- Changes in version 0.2.8.13 - 2017-03-03
- Tor 0.2.8.13 backports a security fix from later Tor
- releases. Anybody running Tor 0.2.8.12 or earlier should upgrade to this
- this release, if for some reason they cannot upgrade to a later
- release series, and if they build Tor with the --enable-expensive-hardening
- option.
- Note that support for Tor 0.2.8.x is ending next year: we will not issue
- any fixes for the Tor 0.2.8.x series after 1 Jan 2018. If you need
- a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.7.7 - 2017-03-03
- Tor 0.2.7.7 backports a number of security fixes from later Tor
- releases. Anybody running Tor 0.2.7.6 or earlier should upgrade to
- this release, if for some reason they cannot upgrade to a later
- release series.
- Note that support for Tor 0.2.7.x is ending this year: we will not issue
- any fixes for the Tor 0.2.7.x series after 1 August 2017. If you need
- a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
- o Directory authority changes (backport from 0.2.8.5-rc):
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Directory authority changes (backport from 0.2.9.2-alpha):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Directory authority key updates (backport from 0.2.8.1-alpha):
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Major bugfixes (parsing, security, backport from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- - Stop a crash that could occur when a client running with DNSPort
- received a query with multiple address types, and the first
- address type was not supported. Found and fixed by Scott Dial.
- Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.6.11 - 2017-03-03
- Tor 0.2.6.11 backports a number of security fixes from later Tor
- releases. Anybody running Tor 0.2.6.10 or earlier should upgrade to
- this release, if for some reason they cannot upgrade to a later
- release series.
- Note that support for Tor 0.2.6.x is ending this year: we will not issue
- any fixes for the Tor 0.2.6.x series after 1 August 2017. If you need
- a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
- o Directory authority changes (backport from 0.2.8.5-rc):
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Directory authority changes (backport from 0.2.9.2-alpha):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Directory authority key updates (backport from 0.2.8.1-alpha):
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Major features (security fixes, backport from 0.2.9.4-alpha):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major bugfixes (parsing, security, backport from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- - Stop a crash that could occur when a client running with DNSPort
- received a query with multiple address types, and the first
- address type was not supported. Found and fixed by Scott Dial.
- Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- - Fix an error that could cause us to read 4 bytes before the
- beginning of an openssl string. This bug could be used to cause
- Tor to crash on systems with unusual malloc implementations, or
- systems with unusual hardening installed. Fixes bug 17404; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (guard selection, backport from 0.2.7.6):
- - Actually look at the Guard flag when selecting a new directory
- guard. When we implemented the directory guard design, we
- accidentally started treating all relays as if they have the Guard
- flag during guard selection, leading to weaker anonymity and worse
- performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
- by Mohsen Imani.
- o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.2.7.6):
- - Fix a compilation warning with Clang 3.6: Do not check the
- presence of an address which can never be NULL. Fixes bug 17781.
- Changes in version 0.2.5.13 - 2017-03-03
- Tor 0.2.5.13 backports a number of security fixes from later Tor
- releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
- this release, if for some reason they cannot upgrade to a later
- release series.
- Note that support for Tor 0.2.5.x is ending next year: we will not issue
- any fixes for the Tor 0.2.5.x series after 1 May 2018. If you need
- a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
- o Directory authority changes (backport from 0.2.8.5-rc):
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Directory authority changes (backport from 0.2.9.2-alpha):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Directory authority key updates (backport from 0.2.8.1-alpha):
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Major features (security fixes, backport from 0.2.9.4-alpha):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major bugfixes (parsing, security, backport from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- - Stop a crash that could occur when a client running with DNSPort
- received a query with multiple address types, and the first
- address type was not supported. Found and fixed by Scott Dial.
- Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- - Fix an error that could cause us to read 4 bytes before the
- beginning of an openssl string. This bug could be used to cause
- Tor to crash on systems with unusual malloc implementations, or
- systems with unusual hardening installed. Fixes bug 17404; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (guard selection, backport from 0.2.7.6):
- - Actually look at the Guard flag when selecting a new directory
- guard. When we implemented the directory guard design, we
- accidentally started treating all relays as if they have the Guard
- flag during guard selection, leading to weaker anonymity and worse
- performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
- by Mohsen Imani.
- o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.2.7.6):
- - Fix a compilation warning with Clang 3.6: Do not check the
- presence of an address which can never be NULL. Fixes bug 17781.
- o Minor bugfixes (crypto error-handling, backport from 0.2.7.2-alpha):
- - Check for failures from crypto_early_init, and refuse to continue.
- A previous typo meant that we could keep going with an
- uninitialized crypto library, and would have OpenSSL initialize
- its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
- when implementing ticket 4900. Patch by "teor".
- o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
- a client authorized hidden service. Fixes bug 15823; bugfix
- on 0.2.1.6-alpha.
- Changes in version 0.2.4.28 - 2017-03-03
- Tor 0.2.4.28 backports a number of security fixes from later Tor
- releases. Anybody running Tor 0.2.4.27 or earlier should upgrade to
- this release, if for some reason they cannot upgrade to a later
- release series.
- Note that support for Tor 0.2.4.x is ending soon: we will not issue
- any fixes for the Tor 0.2.4.x series after 1 August 2017. If you need
- a Tor release series with long-term support, we recommend Tor 0.2.9.x.
- o Directory authority changes (backport from 0.2.8.5-rc):
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Directory authority changes (backport from 0.2.9.2-alpha):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Directory authority key updates (backport from 0.2.8.1-alpha):
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Major features (security fixes, backport from 0.2.9.4-alpha):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major bugfixes (parsing, security, backport from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- - Fix an error that could cause us to read 4 bytes before the
- beginning of an openssl string. This bug could be used to cause
- Tor to crash on systems with unusual malloc implementations, or
- systems with unusual hardening installed. Fixes bug 17404; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (guard selection, backport from 0.2.7.6):
- - Actually look at the Guard flag when selecting a new directory
- guard. When we implemented the directory guard design, we
- accidentally started treating all relays as if they have the Guard
- flag during guard selection, leading to weaker anonymity and worse
- performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
- by Mohsen Imani.
- o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (DoS-resistance, backport from 0.2.7.1-alpha):
- - Make it harder for attackers to overload hidden services with
- introductions, by blocking multiple introduction requests on the
- same circuit. Resolves ticket 15515.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.2.7.6):
- - Fix a compilation warning with Clang 3.6: Do not check the
- presence of an address which can never be NULL. Fixes bug 17781.
- o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
- a client authorized hidden service. Fixes bug 15823; bugfix
- on 0.2.1.6-alpha.
- Changes in version 0.3.0.4-rc - 2017-03-01
- Tor 0.3.0.4-rc fixes some remaining bugs, large and small, in the
- 0.3.0 release series, and introduces a few reliability features to
- keep them from coming back.
- This is the first release candidate in the Tor 0.3.0 series. If we
- find no new bugs or regressions here, the first stable 0.3.0 release
- will be nearly identical to it.
- o Major bugfixes (bridges):
- - When the same bridge is configured multiple times with the same
- identity, but at different address:port combinations, treat those
- bridge instances as separate guards. This fix restores the ability
- of clients to configure the same bridge with multiple pluggable
- transports. Fixes bug 21027; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (hidden service directory v3):
- - Stop crashing on a failed v3 hidden service descriptor lookup
- failure. Fixes bug 21471; bugfixes on 0.3.0.1-alpha.
- o Major bugfixes (parsing):
- - When parsing a malformed content-length field from an HTTP
- message, do not read off the end of the buffer. This bug was a
- potential remote denial-of-service attack against Tor clients and
- relays. A workaround was released in October 2016, to prevent this
- bug from crashing Tor. This is a fix for the underlying issue,
- which should no longer matter (if you applied the earlier patch).
- Fixes bug 20894; bugfix on 0.2.0.16-alpha. Bug found by fuzzing
- using AFL (http://lcamtuf.coredump.cx/afl/).
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor feature (protocol versioning):
- - Add new protocol version for proposal 224. HSIntro now advertises
- version "3-4" and HSDir version "1-2". Fixes ticket 20656.
- o Minor features (directory authorities):
- - Directory authorities now reject descriptors that claim to be
- malformed versions of Tor. Helps prevent exploitation of
- bug 21278.
- - Reject version numbers with components that exceed INT32_MAX.
- Otherwise 32-bit and 64-bit platforms would behave inconsistently.
- Fixes bug 21450; bugfix on 0.0.8pre1.
- - Directory authorities now reject relays running versions
- 0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
- suffer from bug 20499 and don't keep their consensus cache
- up-to-date. Resolves ticket 20509.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor features (reliability, crash):
- - Try better to detect problems in buffers where they might grow (or
- think they have grown) over 2 GB in size. Diagnostic for
- bug 21369.
- o Minor features (testing):
- - During 'make test-network-all', if tor logs any warnings, ask
- chutney to output them. Requires a recent version of chutney with
- the 21572 patch. Implements 21570.
- o Minor bugfixes (certificate expiration time):
- - Avoid using link certificates that don't become valid till some
- time in the future. Fixes bug 21420; bugfix on 0.2.4.11-alpha
- o Minor bugfixes (code correctness):
- - Repair a couple of (unreachable or harmless) cases of the risky
- comparison-by-subtraction pattern that caused bug 21278.
- - Remove a redundant check for the UseEntryGuards option from the
- options_transition_affects_guards() function. Fixes bug 21492;
- bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (directory mirrors):
- - Allow relays to use directory mirrors without a DirPort: these
- relays need to be contacted over their ORPorts using a begindir
- connection. Fixes one case of bug 20711; bugfix on 0.2.8.2-alpha.
- - Clarify the message logged when a remote relay is unexpectedly
- missing an ORPort or DirPort: users were confusing this with a
- local port. Fixes another case of bug 20711; bugfix
- on 0.2.8.2-alpha.
- o Minor bugfixes (guards):
- - Don't warn about a missing guard state on timeout-measurement
- circuits: they aren't supposed to be using guards. Fixes an
- instance of bug 21007; bugfix on 0.3.0.1-alpha.
- - Silence a BUG() warning when attempting to use a guard whose
- descriptor we don't know, and make this scenario less likely to
- happen. Fixes bug 21415; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (hidden service):
- - Pass correct buffer length when encoding legacy ESTABLISH_INTRO
- cells. Previously, we were using sizeof() on a pointer, instead of
- the real destination buffer. Fortunately, that value was only used
- to double-check that there was enough room--which was already
- enforced elsewhere. Fixes bug 21553; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (testing):
- - Fix Raspbian build issues related to missing socket errno in
- test_util.c. Fixes bug 21116; bugfix on 0.2.8.2. Patch
- by "hein".
- - Rename "make fuzz" to "make test-fuzz-corpora", since it doesn't
- actually fuzz anything. Fixes bug 21447; bugfix on 0.3.0.3-alpha.
- - Use bash in src/test/test-network.sh. This ensures we reliably
- call chutney's newer tools/test-network.sh when available. Fixes
- bug 21562; bugfix on 0.2.9.1-alpha.
- o Documentation:
- - Small fixes to the fuzzing documentation. Closes ticket 21472.
- Changes in version 0.2.9.10 - 2017-03-01
- Tor 0.2.9.10 backports a security fix from later Tor release. It also
- includes fixes for some major issues affecting directory authorities,
- LibreSSL compatibility, and IPv6 correctness.
- The Tor 0.2.9.x release series is now marked as a long-term-support
- series. We intend to backport security fixes to 0.2.9.x until at
- least January of 2020.
- o Major bugfixes (directory authority, 0.3.0.3-alpha):
- - During voting, when marking a relay as a probable sybil, do not
- clear its BadExit flag: sybils can still be bad in other ways
- too. (We still clear the other flags.) Fixes bug 21108; bugfix
- on 0.2.0.13-alpha.
- o Major bugfixes (IPv6 Exits, backport from 0.3.0.3-alpha):
- - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
- any IPv6 addresses. Instead, only reject a port over IPv6 if the
- exit policy rejects that port on more than an IPv6 /16 of
- addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
- which rejected a relay's own IPv6 address by default. Fixes bug
- 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
- o Major bugfixes (parsing, also in 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (directory authorities, also in 0.3.0.4-rc):
- - Directory authorities now reject descriptors that claim to be
- malformed versions of Tor. Helps prevent exploitation of
- bug 21278.
- - Reject version numbers with components that exceed INT32_MAX.
- Otherwise 32-bit and 64-bit platforms would behave inconsistently.
- Fixes bug 21450; bugfix on 0.0.8pre1.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor features (portability, compilation, backport from 0.3.0.3-alpha):
- - Autoconf now checks to determine if OpenSSL structures are opaque,
- instead of explicitly checking for OpenSSL version numbers. Part
- of ticket 21359.
- - Support building with recent LibreSSL code that uses opaque
- structures. Closes ticket 21359.
- o Minor bugfixes (code correctness, also in 0.3.0.4-rc):
- - Repair a couple of (unreachable or harmless) cases of the risky
- comparison-by-subtraction pattern that caused bug 21278.
- o Minor bugfixes (tor-resolve, backport from 0.3.0.3-alpha):
- - The tor-resolve command line tool now rejects hostnames over 255
- characters in length. Previously, it would silently truncate them,
- which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
- Patch by "junglefowl".
- Changes in version 0.3.0.3-alpha - 2017-02-03
- Tor 0.3.0.3-alpha fixes a few significant bugs introduced over the
- 0.3.0.x development series, including some that could cause
- authorities to behave badly. There is also a fix for a longstanding
- bug that could prevent IPv6 exits from working. Tor 0.3.0.3-alpha also
- includes some smaller features and bugfixes.
- The Tor 0.3.0.x release series is now in patch-freeze: no additional
- features will be considered for inclusion in 0.3.0.x. We suspect that
- some bugs will probably remain, however, and we encourage people to
- test this release.
- o Major bugfixes (directory authority):
- - During voting, when marking a relay as a probable sybil, do not
- clear its BadExit flag: sybils can still be bad in other ways
- too. (We still clear the other flags.) Fixes bug 21108; bugfix
- on 0.2.0.13-alpha.
- - When deciding whether we have just found a router to be reachable,
- do not penalize it for not having performed an Ed25519 link
- handshake if it does not claim to support an Ed25519 handshake.
- Previously, we would treat such relays as non-running. Fixes bug
- 21107; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (entry guards):
- - Stop trying to build circuits through entry guards for which we
- have no descriptor. Also, stop crashing in the case that we *do*
- accidentally try to build a circuit in such a state. Fixes bug
- 21242; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (IPv6 Exits):
- - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
- any IPv6 addresses. Instead, only reject a port over IPv6 if the
- exit policy rejects that port on more than an IPv6 /16 of
- addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
- which rejected a relay's own IPv6 address by default. Fixes bug
- 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
- o Minor feature (client):
- - Enable IPv6 traffic on the SocksPort by default. To disable this,
- a user will have to specify "NoIPv6Traffic". Closes ticket 21269.
- o Minor feature (fallback scripts):
- - Add a check_existing mode to updateFallbackDirs.py, which checks
- if fallbacks in the hard-coded list are working. Closes ticket
- 20174. Patch by haxxpop.
- o Minor features (ciphersuite selection):
- - Clients now advertise a list of ciphersuites closer to the ones
- preferred by Firefox. Closes part of ticket 15426.
- - Allow relays to accept a wider range of ciphersuites, including
- chacha20-poly1305 and AES-CCM. Closes the other part of 15426.
- o Minor features (controller, configuration):
- - Each of the *Port options, such as SocksPort, ORPort, ControlPort,
- and so on, now comes with a __*Port variant that will not be saved
- to the torrc file by the controller's SAVECONF command. This
- change allows TorBrowser to set up a single-use domain socket for
- each time it launches Tor. Closes ticket 20956.
- - The GETCONF command can now query options that may only be
- meaningful in context-sensitive lists. This allows the controller
- to query the mixed SocksPort/__SocksPort style options introduced
- in feature 20956. Implements ticket 21300.
- o Minor features (portability, compilation):
- - Autoconf now checks to determine if OpenSSL structures are opaque,
- instead of explicitly checking for OpenSSL version numbers. Part
- of ticket 21359.
- - Support building with recent LibreSSL code that uses opaque
- structures. Closes ticket 21359.
- o Minor features (relay):
- - We now allow separation of exit and relay traffic to different
- source IP addresses, using the OutboundBindAddressExit and
- OutboundBindAddressOR options respectively. Closes ticket 17975.
- Written by Michael Sonntag.
- o Minor bugfix (logging):
- - Don't recommend the use of Tor2web in non-anonymous mode.
- Recommending Tor2web is a bad idea because the client loses all
- anonymity. Tor2web should only be used in specific cases by users
- who *know* and understand the issues. Fixes bug 21294; bugfix
- on 0.2.9.3-alpha.
- o Minor bugfixes (client):
- - Always recover from failures in extend_info_from_node(), in an
- attempt to prevent any recurrence of bug 21242. Fixes bug 21372;
- bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (client, entry guards):
- - Fix a bug warning (with backtrace) when we fail a channel that
- circuits to fallback directories on it. Fixes bug 21128; bugfix
- on 0.3.0.1-alpha.
- - Fix a spurious bug warning (with backtrace) when removing an
- expired entry guard. Fixes bug 21129; bugfix on 0.3.0.1-alpha.
- - Fix a bug of the new guard algorithm where tor could stall for up
- to 10 minutes before retrying a guard after a long period of no
- network. Fixes bug 21052; bugfix on 0.3.0.1-alpha.
- - Do not try to build circuits until we have descriptors for our
- primary entry guards. Related to fix for bug 21242.
- o Minor bugfixes (configure, autoconf):
- - Rename the configure option --enable-expensive-hardening to
- --enable-fragile-hardening. Expensive hardening makes the tor
- daemon abort when some kinds of issues are detected. Thus, it
- makes tor more at risk of remote crashes but safer against RCE or
- heartbleed bug category. We now try to explain this issue in a
- message from the configure script. Fixes bug 21290; bugfix
- on 0.2.5.4-alpha.
- o Minor bugfixes (controller):
- - Restore the (deprecated) DROPGUARDS controller command. Fixes bug
- 20824; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (hidden service):
- - Clean up the code for expiring intro points with no associated
- circuits. It was causing, rarely, a service with some expiring
- introduction points to not open enough additional introduction
- points. Fixes part of bug 21302; bugfix on 0.2.7.2-alpha.
- - Stop setting the torrc option HiddenServiceStatistics to "0" just
- because we're not a bridge or relay. Instead, we preserve whatever
- value the user set (or didn't set). Fixes bug 21150; bugfix
- on 0.2.6.2-alpha.
- - Resolve two possible underflows which could lead to creating and
- closing a lot of introduction point circuits in a non-stop loop.
- Fixes bug 21302; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (portability):
- - Use "OpenBSD" compiler macro instead of "OPENBSD" or "__OpenBSD__".
- It is supported by OpenBSD itself, and also by most OpenBSD
- variants (such as Bitrig). Fixes bug 20980; bugfix
- on 0.1.2.1-alpha.
- - When mapping a file of length greater than SIZE_MAX, do not
- silently truncate its contents. This issue could occur on 32 bit
- systems with large file support and files which are larger than 4
- GB. Fixes bug 21134; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (tor-resolve):
- - The tor-resolve command line tool now rejects hostnames over 255
- characters in length. Previously, it would silently truncate them,
- which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
- Patch by "junglefowl".
- o Minor bugfixes (Windows services):
- - Be sure to initialize the monotonic time subsystem before using
- it, even when running as an NT service. Fixes bug 21356; bugfix
- on 0.2.9.1-alpha.
- Changes in version 0.3.0.2-alpha - 2017-01-23
- Tor 0.3.0.2-alpha fixes a denial-of-service bug where an attacker could
- cause relays and clients to crash, even if they were not built with
- the --enable-expensive-hardening option. This bug affects all 0.2.9.x
- versions, and also affects 0.3.0.1-alpha: all relays running an affected
- version should upgrade.
- Tor 0.3.0.2-alpha also improves how exit relays and clients handle DNS
- time-to-live values, makes directory authorities enforce the 1-to-1
- mapping of relay RSA identity keys to ED25519 identity keys, fixes a
- client-side onion service reachability bug, does better at selecting
- the set of fallback directories, and more.
- o Major bugfixes (security, also in 0.2.9.9):
- - Downgrade the "-ftrapv" option from "always on" to "only on when
- --enable-expensive-hardening is provided." This hardening option, like
- others, can turn survivable bugs into crashes--and having it on by
- default made a (relatively harmless) integer overflow bug into a
- denial-of-service bug. Fixes bug 21278 (TROVE-2017-001); bugfix on
- 0.2.9.1-alpha.
- o Major features (security):
- - Change the algorithm used to decide DNS TTLs on client and server
- side, to better resist DNS-based correlation attacks like the
- DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
- Feamster. Now relays only return one of two possible DNS TTL
- values, and clients are willing to believe DNS TTL values up to 3
- hours long. Closes ticket 19769.
- o Major features (directory authority, security):
- - The default for AuthDirPinKeys is now 1: directory authorities
- will reject relays where the RSA identity key matches a previously
- seen value, but the Ed25519 key has changed. Closes ticket 18319.
- o Major bugfixes (client, guard, crash):
- - In circuit_get_global_origin_list(), return the actual list of
- origin circuits. The previous version of this code returned the
- list of all the circuits, and could have caused strange bugs,
- including possible crashes. Fixes bug 21118; bugfix
- on 0.3.0.1-alpha.
- o Major bugfixes (client, onion service, also in 0.2.9.9):
- - Fix a client-side onion service reachability bug, where multiple
- socks requests to an onion service (or a single slow request)
- could cause us to mistakenly mark some of the service's
- introduction points as failed, and we cache that failure so
- eventually we run out and can't reach the service. Also resolves a
- mysterious "Remote server sent bogus reason code 65021" log
- warning. The bug was introduced in ticket 17218, where we tried to
- remember the circuit end reason as a uint16_t, which mangled
- negative values. Partially fixes bug 21056 and fixes bug 20307;
- bugfix on 0.2.8.1-alpha.
- o Major bugfixes (DNS):
- - Fix a bug that prevented exit nodes from caching DNS records for
- more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
- o Minor features (controller):
- - Add "GETINFO sr/current" and "GETINFO sr/previous" keys, to expose
- shared-random values to the controller. Closes ticket 19925.
- o Minor features (entry guards):
- - Add UseEntryGuards to TEST_OPTIONS_DEFAULT_VALUES in order to not
- break regression tests.
- - Require UseEntryGuards when UseBridges is set, in order to make
- sure bridges aren't bypassed. Resolves ticket 20502.
- o Minor features (fallback directories):
- - Select 200 fallback directories for each release. Closes
- ticket 20881.
- - Allow 3 fallback relays per operator, which is safe now that we
- are choosing 200 fallback relays. Closes ticket 20912.
- - Exclude relays affected by bug 20499 from the fallback list.
- Exclude relays from the fallback list if they are running versions
- known to be affected by bug 20499, or if in our tests they deliver
- a stale consensus (i.e. one that expired more than 24 hours ago).
- Closes ticket 20539.
- - Reduce the minimum fallback bandwidth to 1 MByte/s. Part of
- ticket 18828.
- - Require fallback directories to have the same address and port for
- 7 days (now that we have enough relays with this stability).
- Relays whose OnionOO stability timer is reset on restart by bug
- 18050 should upgrade to Tor 0.2.8.7 or later, which has a fix for
- this issue. Closes ticket 20880; maintains short-term fix
- in 0.2.8.2-alpha.
- - Require fallbacks to have flags for 90% of the time (weighted
- decaying average), rather than 95%. This allows at least 73% of
- clients to bootstrap in the first 5 seconds without contacting an
- authority. Part of ticket 18828.
- - Annotate updateFallbackDirs.py with the bandwidth and consensus
- weight for each candidate fallback. Closes ticket 20878.
- - Make it easier to change the output sort order of fallbacks.
- Closes ticket 20822.
- - Display the relay fingerprint when downloading consensuses from
- fallbacks. Closes ticket 20908.
- o Minor features (geoip, also in 0.2.9.9):
- - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
- Country database.
- o Minor features (next-gen onion service directories):
- - Remove the "EnableOnionServicesV3" consensus parameter that we
- introduced in 0.3.0.1-alpha: relays are now always willing to act
- as v3 onion service directories. Resolves ticket 19899.
- o Minor features (linting):
- - Enhance the changes file linter to warn on Tor versions that are
- prefixed with "tor-". Closes ticket 21096.
- o Minor features (logging):
- - In several places, describe unset ed25519 keys as "<unset>",
- rather than the scary "AAAAAAAA...AAA". Closes ticket 21037.
- o Minor bugfix (control protocol):
- - The reply to a "GETINFO config/names" request via the control
- protocol now spells the type "Dependent" correctly. This is a
- breaking change in the control protocol. (The field seems to be
- ignored by the most common known controllers.) Fixes bug 18146;
- bugfix on 0.1.1.4-alpha.
- o Minor bugfixes (bug resilience):
- - Fix an unreachable size_t overflow in base64_decode(). Fixes bug
- 19222; bugfix on 0.2.0.9-alpha. Found by Guido Vranken; fixed by
- Hans Jerry Illikainen.
- o Minor bugfixes (build):
- - Replace obsolete Autoconf macros with their modern equivalent and
- prevent similar issues in the future. Fixes bug 20990; bugfix
- on 0.1.0.1-rc.
- o Minor bugfixes (client, guards):
- - Fix bug where Tor would think that there are circuits waiting for
- better guards even though those circuits have been freed. Fixes
- bug 21142; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (config):
- - Don't assert on startup when trying to get the options list and
- LearnCircuitBuildTimeout is set to 0: we are currently parsing the
- options so of course they aren't ready yet. Fixes bug 21062;
- bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (controller):
- - Make the GETINFO interface for inquiring about entry guards
- support the new guards backend. Fixes bug 20823; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (dead code):
- - Remove a redundant check for PidFile changes at runtime in
- options_transition_allowed(): this check is already performed
- regardless of whether the sandbox is active. Fixes bug 21123;
- bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (documentation):
- - Update the tor manual page to document every option that can not
- be changed while tor is running. Fixes bug 21122.
- o Minor bugfixes (fallback directories):
- - Stop failing when a relay has no uptime data in
- updateFallbackDirs.py. Fixes bug 20945; bugfix on 0.2.8.1-alpha.
- - Avoid checking fallback candidates' DirPorts if they are down in
- OnionOO. When a relay operator has multiple relays, this
- prioritizes relays that are up over relays that are down. Fixes
- bug 20926; bugfix on 0.2.8.3-alpha.
- - Stop failing when OUTPUT_COMMENTS is True in updateFallbackDirs.py.
- Fixes bug 20877; bugfix on 0.2.8.3-alpha.
- o Minor bugfixes (guards, bootstrapping):
- - When connecting to a directory guard during bootstrap, do not mark
- the guard as successful until we receive a good-looking directory
- response from it. Fixes bug 20974; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (onion services):
- - Fix the config reload pruning of old vs new services so it
- actually works when both ephemeral and non-ephemeral services are
- configured. Fixes bug 21054; bugfix on 0.3.0.1-alpha.
- - Allow the number of introduction points to be as low as 0, rather
- than as low as 3. Fixes bug 21033; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (IPv6):
- - Make IPv6-using clients try harder to find an IPv6 directory
- server. Fixes bug 20999; bugfix on 0.2.8.2-alpha.
- - When IPv6 addresses have not been downloaded yet (microdesc
- consensus documents don't list relay IPv6 addresses), use hard-
- coded addresses for authorities, fallbacks, and configured
- bridges. Now IPv6-only clients can use microdescriptors. Fixes bug
- 20996; bugfix on b167e82 from 19608 in 0.2.8.5-alpha.
- o Minor bugfixes (memory leaks):
- - Fix a memory leak when configuring hidden services. Fixes bug
- 20987; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (portability, also in 0.2.9.9):
- - Avoid crashing when Tor is built using headers that contain
- CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
- without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
- on 0.2.9.1-alpha.
- - Fix Libevent detection on platforms without Libevent 1 headers
- installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (relay):
- - Honor DataDirectoryGroupReadable when tor is a relay. Previously,
- initializing the keys would reset the DataDirectory to 0700
- instead of 0750 even if DataDirectoryGroupReadable was set to 1.
- Fixes bug 19953; bugfix on 0.0.2pre16. Patch by "redfish".
- o Minor bugfixes (testing):
- - Remove undefined behavior from the backtrace generator by removing
- its signal handler. Fixes bug 21026; bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (unit tests):
- - Allow the unit tests to pass even when DNS lookups of bogus
- addresses do not fail as expected. Fixes bug 20862 and 20863;
- bugfix on unit tests introduced in 0.2.8.1-alpha
- through 0.2.9.4-alpha.
- o Code simplification and refactoring:
- - Refactor code to manipulate global_origin_circuit_list into
- separate functions. Closes ticket 20921.
- o Documentation (formatting):
- - Clean up formatting of tor.1 man page and HTML doc, where <pre>
- blocks were incorrectly appearing. Closes ticket 20885.
- o Documentation (man page):
- - Clarify many options in tor.1 and add some min/max values for
- HiddenService options. Closes ticket 21058.
- Changes in version 0.2.9.9 - 2017-01-23
- Tor 0.2.9.9 fixes a denial-of-service bug where an attacker could
- cause relays and clients to crash, even if they were not built with
- the --enable-expensive-hardening option. This bug affects all 0.2.9.x
- versions, and also affects 0.3.0.1-alpha: all relays running an affected
- version should upgrade.
- This release also resolves a client-side onion service reachability
- bug, and resolves a pair of small portability issues.
- o Major bugfixes (security):
- - Downgrade the "-ftrapv" option from "always on" to "only on when
- --enable-expensive-hardening is provided." This hardening option,
- like others, can turn survivable bugs into crashes -- and having
- it on by default made a (relatively harmless) integer overflow bug
- into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
- bugfix on 0.2.9.1-alpha.
- o Major bugfixes (client, onion service):
- - Fix a client-side onion service reachability bug, where multiple
- socks requests to an onion service (or a single slow request)
- could cause us to mistakenly mark some of the service's
- introduction points as failed, and we cache that failure so
- eventually we run out and can't reach the service. Also resolves a
- mysterious "Remote server sent bogus reason code 65021" log
- warning. The bug was introduced in ticket 17218, where we tried to
- remember the circuit end reason as a uint16_t, which mangled
- negative values. Partially fixes bug 21056 and fixes bug 20307;
- bugfix on 0.2.8.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (portability):
- - Avoid crashing when Tor is built using headers that contain
- CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
- without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
- on 0.2.9.1-alpha.
- - Fix Libevent detection on platforms without Libevent 1 headers
- installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
- Changes in version 0.3.0.1-alpha - 2016-12-19
- Tor 0.3.0.1-alpha is the first alpha release in the 0.3.0 development
- series. It strengthens Tor's link and circuit handshakes by
- identifying relays by their Ed25519 keys, improves the algorithm that
- clients use to choose and maintain their list of guards, and includes
- additional backend support for the next-generation hidden service
- design. It also contains numerous other small features and
- improvements to security, correctness, and performance.
- Below are the changes since 0.2.9.8.
- o Major features (guard selection algorithm):
- - Tor's guard selection algorithm has been redesigned from the
- ground up, to better support unreliable networks and restrictive
- sets of entry nodes, and to better resist guard-capture attacks by
- hostile local networks. Implements proposal 271; closes
- ticket 19877.
- o Major features (next-generation hidden services):
- - Relays can now handle v3 ESTABLISH_INTRO cells as specified by
- prop224 aka "Next Generation Hidden Services". Service and clients
- don't use this functionality yet. Closes ticket 19043. Based on
- initial code by Alec Heifetz.
- - Relays now support the HSDir version 3 protocol, so that they can
- can store and serve v3 descriptors. This is part of the next-
- generation onion service work detailed in proposal 224. Closes
- ticket 17238.
- o Major features (protocol, ed25519 identity keys):
- - Relays now use Ed25519 to prove their Ed25519 identities and to
- one another, and to clients. This algorithm is faster and more
- secure than the RSA-based handshake we've been doing until now.
- Implements the second big part of proposal 220; Closes
- ticket 15055.
- - Clients now support including Ed25519 identity keys in the EXTEND2
- cells they generate. By default, this is controlled by a consensus
- parameter, currently disabled. You can turn this feature on for
- testing by setting ExtendByEd25519ID in your configuration. This
- might make your traffic appear different than the traffic
- generated by other users, however. Implements part of ticket
- 15056; part of proposal 220.
- - Relays now understand requests to extend to other relays by their
- Ed25519 identity keys. When an Ed25519 identity key is included in
- an EXTEND2 cell, the relay will only extend the circuit if the
- other relay can prove ownership of that identity. Implements part
- of ticket 15056; part of proposal 220.
- o Major bugfixes (scheduler):
- - Actually compare circuit policies in ewma_cmp_cmux(). This bug
- caused the channel scheduler to behave more or less randomly,
- rather than preferring channels with higher-priority circuits.
- Fixes bug 20459; bugfix on 0.2.6.2-alpha.
- o Minor features (controller):
- - When HSFETCH arguments cannot be parsed, say "Invalid argument"
- rather than "unrecognized." Closes ticket 20389; patch from
- Ivan Markin.
- o Minor features (diagnostic, directory client):
- - Warn when we find an unexpected inconsistency in directory
- download status objects. Prevents some negative consequences of
- bug 20593.
- o Minor features (directory authority):
- - Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
- default) to control whether authorities should try to probe relays
- by their Ed25519 link keys. This option will go away in a few
- releases--unless we encounter major trouble in our ed25519 link
- protocol rollout, in which case it will serve as a safety option.
- o Minor features (directory cache):
- - Relays and bridges will now refuse to serve the consensus they
- have if they know it is too old for a client to use. Closes
- ticket 20511.
- o Minor features (ed25519 link handshake):
- - Advertise support for the ed25519 link handshake using the
- subprotocol-versions mechanism, so that clients can tell which
- relays can identity themselves by Ed25519 ID. Closes ticket 20552.
- o Minor features (fingerprinting resistance, authentication):
- - Extend the length of RSA keys used for TLS link authentication to
- 2048 bits. (These weren't used for forward secrecy; for forward
- secrecy, we used P256.) Closes ticket 13752.
- o Minor features (infrastructure):
- - Implement smartlist_add_strdup() function. Replaces the use of
- smartlist_add(sl, tor_strdup(str)). Closes ticket 20048.
- o Minor bugfixes (client):
- - When clients that use bridges start up with a cached consensus on
- disk, they were ignoring it and downloading a new one. Now they
- use the cached one. Fixes bug 20269; bugfix on 0.2.3.12-alpha.
- o Minor bugfixes (configuration):
- - Accept non-space whitespace characters after the severity level in
- the `Log` option. Fixes bug 19965; bugfix on 0.2.1.1-alpha.
- - Support "TByte" and "TBytes" units in options given in bytes.
- "TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
- supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
- o Minor bugfixes (consensus weight):
- - Add new consensus method that initializes bw weights to 1 instead
- of 0. This prevents a zero weight from making it all the way to
- the end (happens in small testing networks) and causing an error.
- Fixes bug 14881; bugfix on 0.2.2.17-alpha.
- o Minor bugfixes (descriptors):
- - Correctly recognise downloaded full descriptors as valid, even
- when using microdescriptors as circuits. This affects clients with
- FetchUselessDescriptors set, and may affect directory authorities.
- Fixes bug 20839; bugfix on 0.2.3.2-alpha.
- o Minor bugfixes (directory system):
- - Download all consensus flavors, descriptors, and authority
- certificates when FetchUselessDescriptors is set, regardless of
- whether tor is a directory cache or not. Fixes bug 20667; bugfix
- on all recent tor versions.
- - Bridges and relays now use microdescriptors (like clients do)
- rather than old-style router descriptors. Now bridges will blend
- in with clients in terms of the circuits they build. Fixes bug
- 6769; bugfix on 0.2.3.2-alpha.
- o Minor bugfixes (ed25519 certificates):
- - Correctly interpret ed25519 certificates that would expire some
- time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (hidden services):
- - Stop ignoring misconfigured hidden services. Instead, refuse to
- start tor until the misconfigurations have been corrected. Fixes
- bug 20559; bugfix on multiple commits in 0.2.7.1-alpha
- and earlier.
- o Minor bugfixes (memory leak at exit):
- - Fix a small harmless memory leak at exit of the previously unused
- RSA->Ed identity cross-certificate. Fixes bug 17779; bugfix
- on 0.2.7.2-alpha.
- o Minor bugfixes (util):
- - When finishing writing a file to disk, if we were about to replace
- the file with the temporary file created before and we fail to
- replace it, remove the temporary file so it doesn't stay on disk.
- Fixes bug 20646; bugfix on 0.2.0.7-alpha. Patch by fk.
- o Minor bugfixes (Windows):
- - Check for getpagesize before using it to mmap files. This fixes
- compilation in some MinGW environments. Fixes bug 20530; bugfix on
- 0.1.2.1-alpha. Reported by "ice".
- o Code simplification and refactoring:
- - Abolish all global guard context in entrynodes.c; replace with new
- guard_selection_t structure as preparation for proposal 271.
- Closes ticket 19858.
- - Introduce rend_service_is_ephemeral() that tells if given onion
- service is ephemeral. Replace unclear NULL-checkings for service
- directory with this function. Closes ticket 20526.
- - Extract magic numbers in circuituse.c into defined variables.
- - Refactor circuit_is_available_for_use to remove unnecessary check.
- - Refactor circuit_predict_and_launch_new for readability and
- testability. Closes ticket 18873.
- - Refactor large if statement in purpose_needs_anonymity to use
- switch statement instead. Closes part of ticket 20077.
- - Refactor the hashing API to return negative values for errors, as
- is done as throughout the codebase. Closes ticket 20717.
- - Remove data structures that were used to index or_connection
- objects by their RSA identity digests. These structures are fully
- redundant with the similar structures used in the
- channel abstraction.
- - Remove duplicate code in the channel_write_*cell() functions.
- Closes ticket 13827; patch from Pingl.
- - Remove redundant behavior of is_sensitive_dir_purpose, refactor to
- use only purpose_needs_anonymity. Closes part of ticket 20077.
- - The code to generate and parse EXTEND and EXTEND2 cells has been
- replaced with code automatically generated by the
- "trunnel" utility.
- o Documentation:
- - Include the "TBits" unit in Tor's man page. Fixes part of bug
- 20622; bugfix on 0.2.5.1-alpha.
- - Change '1' to 'weight_scale' in consensus bw weights calculation
- comments, as that is reality. Closes ticket 20273. Patch
- from pastly.
- - Correct the value for AuthDirGuardBWGuarantee in the manpage, from
- 250 KBytes to 2 MBytes. Fixes bug 20435; bugfix
- on 0.2.5.6-alpha.
- - Stop the man page from incorrectly stating that HiddenServiceDir
- must already exist. Fixes 20486.
- - Clarify that when ClientRejectInternalAddresses is enabled (which
- is the default), multicast DNS hostnames for machines on the local
- network (of the form *.local) are also rejected. Closes
- ticket 17070.
- o Removed features:
- - The AuthDirMaxServersPerAuthAddr option no longer exists: The same
- limit for relays running on a single IP applies to authority IP
- addresses as well as to non-authority IP addresses. Closes
- ticket 20960.
- - The UseDirectoryGuards torrc option no longer exists: all users
- that use entry guards will also use directory guards. Related to
- proposal 271; implements part of ticket 20831.
- o Testing:
- - New unit tests for tor_htonll(). Closes ticket 19563. Patch
- from "overcaffeinated".
- - Perform the coding style checks when running the tests and fail
- when coding style violations are found. Closes ticket 5500.
- - Add tests for networkstatus_compute_bw_weights_v10.
- - Add unit tests circuit_predict_and_launch_new.
- - Extract dummy_origin_circuit_new so it can be used by other
- test functions.
- Changes in version 0.2.8.12 - 2016-12-19
- Tor 0.2.8.12 backports a fix for a medium-severity issue (bug 21018
- below) where Tor clients could crash when attempting to visit a
- hostile hidden service. Clients are recommended to upgrade as packages
- become available for their systems.
- It also includes an updated list of fallback directories, backported
- from 0.2.9.
- Now that the Tor 0.2.9 series is stable, only major bugfixes will be
- backported to 0.2.8 in the future.
- o Major bugfixes (parsing, security, backported from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Minor features (fallback directory list, backported from 0.2.9.8):
- - Replace the 81 remaining fallbacks of the 100 originally
- introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
- fallbacks (123 new, 54 existing, 27 removed) generated in December
- 2016. Resolves ticket 20170.
- o Minor features (geoip, backported from 0.2.9.7-rc):
- - Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.9.8 - 2016-12-19
- Tor 0.2.9.8 is the first stable release of the Tor 0.2.9 series.
- The Tor 0.2.9 series makes mandatory a number of security features
- that were formerly optional. It includes support for a new shared-
- randomness protocol that will form the basis for next generation
- hidden services, includes a single-hop hidden service mode for
- optimizing .onion services that don't actually want to be hidden,
- tries harder not to overload the directory authorities with excessive
- downloads, and supports a better protocol versioning scheme for
- improved compatibility with other implementations of the Tor protocol.
- And of course, there are numerous other bugfixes and improvements.
- This release also includes a fix for a medium-severity issue (bug
- 21018 below) where Tor clients could crash when attempting to visit a
- hostile hidden service. Clients are recommended to upgrade as packages
- become available for their systems.
- Below are the changes since 0.2.9.7-rc. For a list of all changes
- since 0.2.8, see the ReleaseNotes file.
- o Major bugfixes (parsing, security):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Minor features (fallback directory list):
- - Replace the 81 remaining fallbacks of the 100 originally
- introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
- fallbacks (123 new, 54 existing, 27 removed) generated in December
- 2016. Resolves ticket 20170.
- Changes in version 0.2.9.7-rc - 2016-12-12
- Tor 0.2.9.7-rc fixes a few small bugs remaining in Tor 0.2.9.6-rc,
- including a few that had prevented tests from passing on
- some platforms.
- o Minor features (geoip):
- - Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
- Country database.
- o Minor bugfix (build):
- - The current Git revision when building from a local repository is
- now detected correctly when using git worktrees. Fixes bug 20492;
- bugfix on 0.2.3.9-alpha.
- o Minor bugfixes (directory authority):
- - When computing old Tor protocol line version in protover, we were
- looking at 0.2.7.5 twice instead of a specific case for
- 0.2.9.1-alpha. Fixes bug 20810; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (download scheduling):
- - Resolve a "bug" warning when considering a download schedule whose
- delay had approached INT_MAX. Fixes 20875; bugfix on 0.2.9.5-alpha.
- o Minor bugfixes (logging):
- - Downgrade a harmless log message about the
- pending_entry_connections list from "warn" to "info". Mitigates
- bug 19926.
- o Minor bugfixes (memory leak):
- - Fix a small memory leak when receiving AF_UNIX connections on a
- SocksPort. Fixes bug 20716; bugfix on 0.2.6.3-alpha.
- - When moving a signed descriptor object from a source to an
- existing destination, free the allocated memory inside that
- destination object. Fixes bug 20715; bugfix on 0.2.8.3-alpha.
- o Minor bugfixes (memory leak, use-after-free, linux seccomp2 sandbox):
- - Fix a memory leak and use-after-free error when removing entries
- from the sandbox's getaddrinfo() cache. Fixes bug 20710; bugfix on
- 0.2.5.5-alpha. Patch from "cypherpunks".
- o Minor bugfixes (portability):
- - Use the correct spelling of MAC_OS_X_VERSION_10_12 on configure.ac
- Fixes bug 20935; bugfix on 0.2.9.6-rc.
- o Minor bugfixes (unit tests):
- - Stop expecting NetBSD unit tests to report success for ipfw. Part
- of a fix for bug 19960; bugfix on 0.2.9.5-alpha.
- - Fix tolerances in unit tests for monotonic time comparisons
- between nanoseconds and microseconds. Previously, we accepted a 10
- us difference only, which is not realistic on every platform's
- clock_gettime(). Fixes bug 19974; bugfix on 0.2.9.1-alpha.
- - Remove a double-free in the single onion service unit test. Stop
- ignoring a return value. Make future changes less error-prone.
- Fixes bug 20864; bugfix on 0.2.9.6-rc.
- Changes in version 0.2.8.11 - 2016-12-08
- Tor 0.2.8.11 backports fixes for additional portability issues that
- could prevent Tor from building correctly on OSX Sierra, or with
- OpenSSL 1.1. Affected users should upgrade; others can safely stay
- with 0.2.8.10.
- o Minor bugfixes (portability):
- - Avoid compilation errors when building on OSX Sierra. Sierra began
- to support the getentropy() and clock_gettime() APIs, but created
- a few problems in doing so. Tor 0.2.9 has a more thorough set of
- workarounds; in 0.2.8, we are just using the /dev/urandom and mach
- monotonic time interfaces. Fixes bug 20865. Bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
- - Fix compilation with OpenSSL 1.1 and less commonly-used CPU
- architectures. Closes ticket 20588.
- Changes in version 0.2.8.10 - 2016-12-02
- Tor 0.2.8.10 backports a fix for a bug that would sometimes make clients
- unusable after they left standby mode. It also backports fixes for
- a few portability issues and a small but problematic memory leak.
- o Major bugfixes (client reliability, backport from 0.2.9.5-alpha):
- - When Tor leaves standby because of a new application request, open
- circuits as needed to serve that request. Previously, we would
- potentially wait a very long time. Fixes part of bug 19969; bugfix
- on 0.2.8.1-alpha.
- o Major bugfixes (client performance, backport from 0.2.9.5-alpha):
- - Clients now respond to new application stream requests immediately
- when they arrive, rather than waiting up to one second before
- starting to handle them. Fixes part of bug 19969; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (portability, backport from 0.2.9.6-rc):
- - Work around a bug in the OSX 10.12 SDK that would prevent us from
- successfully targeting earlier versions of OSX. Resolves
- ticket 20235.
- o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
- - Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
- 20551; bugfix on 0.2.1.1-alpha.
- o Minor bugfixes (relay, backport from 0.2.9.5-alpha):
- - Work around a memory leak in OpenSSL 1.1 when encoding public
- keys. Fixes bug 20553; bugfix on 0.0.2pre8.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.9.6-rc - 2016-12-02
- Tor 0.2.9.6-rc fixes a few remaining bugs found in the previous alpha
- version. We hope that it will be ready to become stable soon, and we
- encourage everyone to test this release. If no showstopper bugs are
- found here, the next 0.2.9 release will be stable.
- o Major bugfixes (relay, resolver, logging):
- - For relays that don't know their own address, avoid attempting a
- local hostname resolve for each descriptor we download. This
- will cut down on the number of "Success: chose address 'x.x.x.x'"
- log lines, and also avoid confusing clock jumps if the resolver
- is slow. Fixes bugs 20423 and 20610; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (client, fascistfirewall):
- - Avoid spurious warnings when ReachableAddresses or FascistFirewall
- is set. Fixes bug 20306; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (hidden services):
- - Stop ignoring the anonymity status of saved keys for hidden
- services and single onion services when first starting tor.
- Instead, refuse to start tor if any hidden service key has been
- used in a different hidden service anonymity mode. Fixes bug
- 20638; bugfix on 17178 in 0.2.9.3-alpha; reported by ahf.
- o Minor bugfixes (portability):
- - Work around a bug in the OSX 10.12 SDK that would prevent us from
- successfully targeting earlier versions of OSX. Resolves
- ticket 20235.
- - Run correctly when built on Windows build environments that
- require _vcsprintf(). Fixes bug 20560; bugfix on 0.2.2.11-alpha.
- o Minor bugfixes (single onion services, Tor2web):
- - Stop complaining about long-term one-hop circuits deliberately
- created by single onion services and Tor2web. These log messages
- are intended to diagnose issue 8387, which relates to circuits
- hanging around forever for no reason. Fixes bug 20613; bugfix on
- 0.2.9.1-alpha. Reported by "pastly".
- o Minor bugfixes (unit tests):
- - Stop spurious failures in the local interface address discovery
- unit tests. Fixes bug 20634; bugfix on 0.2.8.1-alpha; patch by
- Neel Chauhan.
- o Documentation:
- - Correct the minimum bandwidth value in torrc.sample, and queue a
- corresponding change for torrc.minimal. Closes ticket 20085.
- Changes in version 0.2.9.5-alpha - 2016-11-08
- Tor 0.2.9.5-alpha fixes numerous bugs discovered in the previous alpha
- version. We believe one or two probably remain, and we encourage
- everyone to test this release.
- o Major bugfixes (client performance):
- - Clients now respond to new application stream requests immediately
- when they arrive, rather than waiting up to one second before
- starting to handle them. Fixes part of bug 19969; bugfix
- on 0.2.8.1-alpha.
- o Major bugfixes (client reliability):
- - When Tor leaves standby because of a new application request, open
- circuits as needed to serve that request. Previously, we would
- potentially wait a very long time. Fixes part of bug 19969; bugfix
- on 0.2.8.1-alpha.
- o Major bugfixes (download scheduling):
- - When using an exponential backoff schedule, do not give up on
- downloading just because we have failed a bunch of times. Since
- each delay is longer than the last, retrying indefinitely won't
- hurt. Fixes bug 20536; bugfix on 0.2.9.1-alpha.
- - If a consensus expires while we are waiting for certificates to
- download, stop waiting for certificates.
- - If we stop waiting for certificates less than a minute after we
- started downloading them, do not consider the certificate download
- failure a separate failure. Fixes bug 20533; bugfix
- on 0.2.0.9-alpha.
- - Remove the maximum delay on exponential-backoff scheduling. Since
- we now allow an infinite number of failures (see ticket 20536), we
- must now allow the time to grow longer on each failure. Fixes part
- of bug 20534; bugfix on 0.2.9.1-alpha.
- - Make our initial download delays closer to those from 0.2.8. Fixes
- another part of bug 20534; bugfix on 0.2.9.1-alpha.
- - When determining when to download a directory object, handle times
- after 2038 if the operating system supports them. (Someday this
- will be important!) Fixes bug 20587; bugfix on 0.2.8.1-alpha.
- - When using exponential backoff in test networks, use a lower
- exponent, so the delays do not vary as much. This helps test
- networks bootstrap consistently. Fixes bug 20597; bugfix on 20499.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (client directory scheduling):
- - Treat "relay too busy to answer request" as a failed request and a
- reason to back off on our retry frequency. This is safe now that
- exponential backoffs retry indefinitely, and avoids a bug where we
- would reset our download schedule erroneously. Fixes bug 20593;
- bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (client, logging):
- - Remove a BUG warning in circuit_pick_extend_handshake(). Instead,
- assume all nodes support EXTEND2. Use ntor whenever a key is
- available. Fixes bug 20472; bugfix on 0.2.9.3-alpha.
- - On DNSPort, stop logging a BUG warning on a failed hostname
- lookup. Fixes bug 19869; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (hidden services):
- - When configuring hidden services, check every hidden service
- directory's permissions. Previously, we only checked the last
- hidden service. Fixes bug 20529; bugfix the work to fix 13942
- in 0.2.6.2-alpha.
- o Minor bugfixes (portability):
- - Fix compilation with OpenSSL 1.1 and less commonly-used CPU
- architectures. Closes ticket 20588.
- - Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
- removed the ECDH ciphers which caused the tests to fail on
- platforms which use it. Fixes bug 20460; bugfix on 0.2.8.1-alpha.
- - Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
- 20551; bugfix on 0.2.1.1-alpha.
- o Minor bugfixes (relay bootstrap):
- - Ensure relays don't make multiple connections during bootstrap.
- Fixes bug 20591; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (relay):
- - Work around a memory leak in OpenSSL 1.1 when encoding public
- keys. Fixes bug 20553; bugfix on 0.0.2pre8.
- - Avoid a small memory leak when informing worker threads about
- rotated onion keys. Fixes bug 20401; bugfix on 0.2.6.3-alpha.
- - Do not try to parallelize workers more than 16x without the user
- explicitly configuring us to do so, even if we do detect more than
- 16 CPU cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (single onion services):
- - Start correctly when creating a single onion service in a
- directory that did not previously exist. Fixes bug 20484; bugfix
- on 0.2.9.3-alpha.
- o Minor bugfixes (testing):
- - Avoid a unit test failure on systems with over 16 detectable CPU
- cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
- o Documentation:
- - Clarify that setting HiddenServiceNonAnonymousMode requires you to
- also set "SOCKSPort 0". Fixes bug 20487; bugfix on 0.2.9.3-alpha.
- - Module-level documentation for several more modules. Closes
- tickets 19287 and 19290.
- Changes in version 0.2.8.9 - 2016-10-17
- Tor 0.2.8.9 backports a fix for a security hole in previous versions
- of Tor that would allow a remote attacker to crash a Tor client,
- hidden service, relay, or authority. All Tor users should upgrade to
- this version, or to 0.2.9.4-alpha. Patches will be released for older
- versions of Tor.
- o Major features (security fixes, also in 0.2.9.4-alpha):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.9.4-alpha - 2016-10-17
- Tor 0.2.9.4-alpha fixes a security hole in previous versions of Tor
- that would allow a remote attacker to crash a Tor client, hidden
- service, relay, or authority. All Tor users should upgrade to this
- version, or to 0.2.8.9. Patches will be released for older versions
- of Tor.
- Tor 0.2.9.4-alpha also adds numerous small features and fix-ups to
- previous versions of Tor, including the implementation of a feature to
- future- proof the Tor ecosystem against protocol changes, some bug
- fixes necessary for Tor Browser to use unix domain sockets correctly,
- and several portability improvements. We anticipate that this will be
- the last alpha in the Tor 0.2.9 series, and that the next release will
- be a release candidate.
- o Major features (security fixes):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major features (subprotocol versions):
- - Tor directory authorities now vote on a set of recommended
- subprotocol versions, and on a set of required subprotocol
- versions. Clients and relays that lack support for a _required_
- subprotocol version will not start; those that lack support for a
- _recommended_ subprotocol version will warn the user to upgrade.
- Closes ticket 19958; implements part of proposal 264.
- - Tor now uses "subprotocol versions" to indicate compatibility.
- Previously, versions of Tor looked at the declared Tor version of
- a relay to tell whether they could use a given feature. Now, they
- should be able to rely on its declared subprotocol versions. This
- change allows compatible implementations of the Tor protocol(s) to
- exist without pretending to be 100% bug-compatible with particular
- releases of Tor itself. Closes ticket 19958; implements part of
- proposal 264.
- o Minor feature (fallback directories):
- - Remove broken fallbacks from the hard-coded fallback directory
- list. Closes ticket 20190; patch by teor.
- o Minor features (client, directory):
- - Since authorities now omit all routers that lack the Running and
- Valid flags, we assume that any relay listed in the consensus must
- have those flags. Closes ticket 20001; implements part of
- proposal 272.
- o Minor features (compilation, portability):
- - Compile correctly on MacOS 10.12 (aka "Sierra"). Closes
- ticket 20241.
- o Minor features (development tools, etags):
- - Teach the "make tags" Makefile target how to correctly find
- "MOCK_IMPL" function definitions. Patch from nherring; closes
- ticket 16869.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
- Country database.
- o Minor features (unix domain sockets):
- - When configuring a unix domain socket for a SocksPort,
- ControlPort, or Hidden service, you can now wrap the address in
- quotes, using C-style escapes inside the quotes. This allows unix
- domain socket paths to contain spaces.
- o Minor features (virtual addresses):
- - Increase the maximum number of bits for the IPv6 virtual network
- prefix from 16 to 104. In this way, the condition for address
- allocation is less restrictive. Closes ticket 20151; feature
- on 0.2.4.7-alpha.
- o Minor bugfixes (address discovery):
- - Stop reordering IP addresses returned by the OS. This makes it
- more likely that Tor will guess the same relay IP address every
- time. Fixes issue 20163; bugfix on 0.2.7.1-alpha, ticket 17027.
- Reported by René Mayrhofer, patch by "cypherpunks".
- o Minor bugfixes (client, unix domain sockets):
- - Disable IsolateClientAddr when using AF_UNIX backed SocksPorts as
- the client address is meaningless. Fixes bug 20261; bugfix
- on 0.2.6.3-alpha.
- o Minor bugfixes (compilation, OpenBSD):
- - Detect Libevent2 functions correctly on systems that provide
- libevent2, but where libevent1 is linked with -levent. Fixes bug
- 19904; bugfix on 0.2.2.24-alpha. Patch from Rubiate.
- o Minor bugfixes (configuration):
- - When parsing quoted configuration values from the torrc file,
- handle windows line endings correctly. Fixes bug 19167; bugfix on
- 0.2.0.16-alpha. Patch from "Pingl".
- o Minor bugfixes (getpass):
- - Defensively fix a non-triggerable heap corruption at do_getpass()
- to protect ourselves from mistakes in the future. Fixes bug
- 19223; bugfix on 0.2.7.3-rc. Bug found by Guido Vranken, patch
- by nherring.
- o Minor bugfixes (hidden service):
- - Allow hidden services to run on IPv6 addresses even when the
- IPv6Exit option is not set. Fixes bug 18357; bugfix
- on 0.2.4.7-alpha.
- o Documentation:
- - Add module-level internal documentation for 36 C files that
- previously didn't have a high-level overview. Closes ticket #20385.
- o Required libraries:
- - When building with OpenSSL, Tor now requires version 1.0.1 or
- later. OpenSSL 1.0.0 and earlier are no longer supported by the
- OpenSSL team, and should not be used. Closes ticket 20303.
- Changes in version 0.2.9.3-alpha - 2016-09-23
- Tor 0.2.9.3-alpha adds improved support for entities that want to make
- high-performance services available through the Tor .onion mechanism
- without themselves receiving anonymity as they host those services. It
- also tries harder to ensure that all steps on a circuit are using the
- strongest crypto possible, strengthens some TLS properties, and
- resolves several bugs -- including a pair of crash bugs from the 0.2.8
- series. Anybody running an earlier version of 0.2.9.x should upgrade.
- o Major bugfixes (crash, also in 0.2.8.8):
- - Fix a complicated crash bug that could affect Tor clients
- configured to use bridges when replacing a networkstatus consensus
- in which one of their bridges was mentioned. OpenBSD users saw
- more crashes here, but all platforms were potentially affected.
- Fixes bug 20103; bugfix on 0.2.8.2-alpha.
- o Major bugfixes (relay, OOM handler, also in 0.2.8.8):
- - Fix a timing-dependent assertion failure that could occur when we
- tried to flush from a circuit after having freed its cells because
- of an out-of-memory condition. Fixes bug 20203; bugfix on
- 0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
- this one.
- o Major features (circuit building, security):
- - Authorities, relays and clients now require ntor keys in all
- descriptors, for all hops (except for rare hidden service protocol
- cases), for all circuits, and for all other roles. Part of
- ticket 19163.
- - Tor authorities, relays, and clients only use ntor, except for
- rare cases in the hidden service protocol. Part of ticket 19163.
- o Major features (single-hop "hidden" services):
- - Add experimental HiddenServiceSingleHopMode and
- HiddenServiceNonAnonymousMode options. When both are set to 1,
- every hidden service on a Tor instance becomes a non-anonymous
- Single Onion Service. Single Onions make one-hop (direct)
- connections to their introduction and renzedvous points. One-hop
- circuits make Single Onion servers easily locatable, but clients
- remain location-anonymous. This is compatible with the existing
- hidden service implementation, and works on the current tor
- network without any changes to older relays or clients. Implements
- proposal 260, completes ticket 17178. Patch by teor and asn.
- o Major features (resource management):
- - Tor can now notice it is about to run out of sockets, and
- preemptively close connections of lower priority. (This feature is
- off by default for now, since the current prioritizing method is
- yet not mature enough. You can enable it by setting
- "DisableOOSCheck 0", but watch out: it might close some sockets
- you would rather have it keep.) Closes ticket 18640.
- o Major bugfixes (circuit building):
- - Hidden service client-to-intro-point and service-to-rendezvous-
- point circuits use the TAP key supplied by the protocol, to avoid
- epistemic attacks. Fixes bug 19163; bugfix on 0.2.4.18-rc.
- o Major bugfixes (compilation, OpenBSD):
- - Fix a Libevent-detection bug in our autoconf script that would
- prevent Tor from linking successfully on OpenBSD. Patch from
- rubiate. Fixes bug 19902; bugfix on 0.2.9.1-alpha.
- o Major bugfixes (hidden services):
- - Clients now require hidden services to include the TAP keys for
- their intro points in the hidden service descriptor. This prevents
- an inadvertent upgrade to ntor, which a malicious hidden service
- could use to distinguish clients by consensus version. Fixes bug
- 20012; bugfix on 0.2.4.8-alpha. Patch by teor.
- o Minor features (security, TLS):
- - Servers no longer support clients that without AES ciphersuites.
- (3DES is no longer considered an acceptable cipher.) We believe
- that no such Tor clients currently exist, since Tor has required
- OpenSSL 0.9.7 or later since 2009. Closes ticket 19998.
- o Minor feature (fallback directories):
- - Remove 8 fallbacks that are no longer suitable, leaving 81 of the
- 100 fallbacks originally introduced in Tor 0.2.8.2-alpha in March
- 2016. Closes ticket 20190; patch by teor.
- o Minor features (geoip, also in 0.2.8.8):
- - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
- Country database.
- o Minor feature (port flags):
- - Add new flags to the *Port options to finer control over which
- requests are allowed. The flags are NoDNSRequest, NoOnionTraffic,
- and the synthetic flag OnionTrafficOnly, which is equivalent to
- NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic. Closes enhancement
- 18693; patch by "teor".
- o Minor features (directory authority):
- - After voting, if the authorities decide that a relay is not
- "Valid", they no longer include it in the consensus at all. Closes
- ticket 20002; implements part of proposal 272.
- o Minor features (testing):
- - Disable memory protections on OpenBSD when performing our unit
- tests for memwipe(). The test deliberately invokes undefined
- behavior, and the OpenBSD protections interfere with this. Patch
- from "rubiate". Closes ticket 20066.
- o Minor features (testing, ipv6):
- - Add the single-onion and single-onion-ipv6 chutney targets to
- "make test-network-all". This requires a recent chutney version
- with the single onion network flavours (git c72a652 or later).
- Closes ticket 20072; patch by teor.
- - Add the hs-ipv6 chutney target to make test-network-all's IPv6
- tests. Remove bridges+hs, as it's somewhat redundant. This
- requires a recent chutney version that supports IPv6 clients,
- relays, and authorities. Closes ticket 20069; patch by teor.
- o Minor features (Tor2web):
- - Make Tor2web clients respect ReachableAddresses. This feature was
- inadvertently enabled in 0.2.8.6, then removed by bugfix 19973 on
- 0.2.8.7. Implements feature 20034. Patch by teor.
- o Minor features (unit tests):
- - We've done significant work to make the unit tests run faster.
- - Our link-handshake unit tests now check that when invalid
- handshakes fail, they fail with the error messages we expected.
- - Our unit testing code that captures log messages no longer
- prevents them from being written out if the user asked for them
- (by passing --debug or --info or or --notice --warn to the "test"
- binary). This change prevents us from missing unexpected log
- messages simply because we were looking for others. Related to
- ticket 19999.
- - The unit tests now log all warning messages with the "BUG" flag.
- Previously, they only logged errors by default. This change will
- help us make our testing code more correct, and make sure that we
- only hit this code when we mean to. In the meantime, however,
- there will be more warnings in the unit test logs than before.
- This is preparatory work for ticket 19999.
- - The unit tests now treat any failure of a "tor_assert_nonfatal()"
- assertion as a test failure.
- o Minor bug fixes (circuits):
- - Use the CircuitBuildTimeout option whenever
- LearnCircuitBuildTimeout is disabled. Previously, we would respect
- the option when a user disabled it, but not when it was disabled
- because some other option was set. Fixes bug 20073; bugfix on
- 0.2.4.12-alpha. Patch by teor.
- o Minor bugfixes (allocation):
- - Change how we allocate memory for large chunks on buffers, to
- avoid a (currently impossible) integer overflow, and to waste less
- space when allocating unusually large chunks. Fixes bug 20081;
- bugfix on 0.2.0.16-alpha. Issue identified by Guido Vranken.
- - Always include orconfig.h before including any other C headers.
- Sometimes, it includes macros that affect the behavior of the
- standard headers. Fixes bug 19767; bugfix on 0.2.9.1-alpha (the
- first version to use AC_USE_SYSTEM_EXTENSIONS).
- - Fix a syntax error in the IF_BUG_ONCE__() macro in non-GCC-
- compatible compilers. Fixes bug 20141; bugfix on 0.2.9.1-alpha.
- Patch from Gisle Vanem.
- - Stop trying to build with Clang 4.0's -Wthread-safety warnings.
- They apparently require a set of annotations that we aren't
- currently using, and they create false positives in our pthreads
- wrappers. Fixes bug 20110; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (directory authority):
- - Die with a more useful error when the operator forgets to place
- the authority_signing_key file into the keys directory. This
- avoids an uninformative assert & traceback about having an invalid
- key. Fixes bug 20065; bugfix on 0.2.0.1-alpha.
- - When allowing private addresses, mark Exits that only exit to
- private locations as such. Fixes bug 20064; bugfix
- on 0.2.2.9-alpha.
- o Minor bugfixes (documentation):
- - Document the default PathsNeededToBuildCircuits value that's used
- by clients when the directory authorities don't set
- min_paths_for_circs_pct. Fixes bug 20117; bugfix on 02c320916e02
- in 0.2.4.10-alpha. Patch by teor, reported by Jesse V.
- - Fix manual for the User option: it takes a username, not a UID.
- Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
- a manpage!).
- o Minor bugfixes (hidden services):
- - Stop logging intro point details to the client log on certain
- error conditions. Fixed as part of bug 20012; bugfix on
- 0.2.4.8-alpha. Patch by teor.
- o Minor bugfixes (IPv6, testing):
- - Check for IPv6 correctly on Linux when running test networks.
- Fixes bug 19905; bugfix on 0.2.7.3-rc; patch by teor.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Add permission to run the sched_yield() and sigaltstack() system
- calls, in order to support versions of Tor compiled with asan or
- ubsan code that use these calls. Now "sandbox 1" and
- "--enable-expensive-hardening" should be compatible on more
- systems. Fixes bug 20063; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (logging):
- - When logging a message from the BUG() macro, be explicit about
- what we were asserting. Previously we were confusing what we were
- asserting with what the bug was. Fixes bug 20093; bugfix
- on 0.2.9.1-alpha.
- - When we are unable to remove the bw_accounting file, do not warn
- if the reason we couldn't remove it was that it didn't exist.
- Fixes bug 19964; bugfix on 0.2.5.4-alpha. Patch from 'pastly'.
- o Minor bugfixes (option parsing):
- - Count unix sockets when counting client listeners (SOCKS, Trans,
- NATD, and DNS). This has no user-visible behaviour changes: these
- options are set once, and never read. Required for correct
- behaviour in ticket 17178. Fixes bug 19677; bugfix on
- 0.2.6.3-alpha. Patch by teor.
- o Minor bugfixes (options):
- - Check the consistency of UseEntryGuards and EntryNodes more
- reliably. Fixes bug 20074; bugfix on 0.2.4.12-alpha. Patch
- by teor.
- - Stop changing the configured value of UseEntryGuards on
- authorities and Tor2web clients. Fixes bug 20074; bugfix on
- commits 51fc6799 in 0.1.1.16-rc and acda1735 in 0.2.4.3-alpha.
- Patch by teor.
- o Minor bugfixes (Tor2web):
- - Prevent Tor2web clients running hidden services, these services
- are not anonymous due to the one-hop client paths. Fixes bug
- 19678. Patch by teor.
- o Minor bugfixes (unit tests):
- - Fix a shared-random unit test that was failing on big endian
- architectures due to internal representation of a integer copied
- to a buffer. The test is changed to take a full 32 bytes of data
- and use the output of a python script that make the COMMIT and
- REVEAL calculation according to the spec. Fixes bug 19977; bugfix
- on 0.2.9.1-alpha.
- - The tor_tls_server_info_callback unit test no longer crashes when
- debug-level logging is turned on. Fixes bug 20041; bugfix
- on 0.2.8.1-alpha.
- Changes in version 0.2.8.8 - 2016-09-23
- Tor 0.2.8.8 fixes two crash bugs present in previous versions of the
- 0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
- who select public relays as their bridges.
- o Major bugfixes (crash):
- - Fix a complicated crash bug that could affect Tor clients
- configured to use bridges when replacing a networkstatus consensus
- in which one of their bridges was mentioned. OpenBSD users saw
- more crashes here, but all platforms were potentially affected.
- Fixes bug 20103; bugfix on 0.2.8.2-alpha.
- o Major bugfixes (relay, OOM handler):
- - Fix a timing-dependent assertion failure that could occur when we
- tried to flush from a circuit after having freed its cells because
- of an out-of-memory condition. Fixes bug 20203; bugfix on
- 0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
- this one.
- o Minor feature (fallback directories):
- - Remove 8 fallbacks that are no longer suitable, leaving 81 of the
- 100 fallbacks originally introduced in Tor 0.2.8.2-alpha in March
- 2016. Closes ticket 20190; patch by teor.
- o Minor features (geoip):
- - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.9.2-alpha - 2016-08-24
- Tor 0.2.9.2-alpha continues development of the 0.2.9 series with
- several new features and bugfixes. It also includes an important
- authority update and an important bugfix from 0.2.8.7. Everyone who
- sets the ReachableAddresses option, and all bridges, are strongly
- encouraged to upgrade to 0.2.8.7, or to 0.2.9.2-alpha.
- o Directory authority changes (also in 0.2.8.7):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Major bugfixes (client, security, also in 0.2.8.7):
- - Only use the ReachableAddresses option to restrict the first hop
- in a path. In earlier versions of 0.2.8.x, it would apply to
- every hop in the path, with a possible degradation in anonymity
- for anyone using an uncommon ReachableAddress setting. Fixes bug
- 19973; bugfix on 0.2.8.2-alpha.
- o Major features (user interface):
- - Tor now supports the ability to declare options deprecated, so
- that we can recommend that people stop using them. Previously,
- this was done in an ad-hoc way. Closes ticket 19820.
- o Major bugfixes (directory downloads):
- - Avoid resetting download status for consensuses hourly, since we
- already have another, smarter retry mechanism. Fixes bug 8625;
- bugfix on 0.2.0.9-alpha.
- o Minor features (config):
- - Warn users when descriptor and port addresses are inconsistent.
- Mitigates bug 13953; patch by teor.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
- Country database.
- o Minor features (user interface):
- - There is a new --list-deprecated-options command-line option to
- list all of the deprecated options. Implemented as part of
- ticket 19820.
- o Minor bugfixes (code style):
- - Fix an integer signedness conversion issue in the case conversion
- tables. Fixes bug 19168; bugfix on 0.2.1.11-alpha.
- o Minor bugfixes (compilation):
- - Build correctly on versions of libevent2 without support for
- evutil_secure_rng_add_bytes(). Fixes bug 19904; bugfix
- on 0.2.5.4-alpha.
- - Fix a compilation warning on GCC versions before 4.6. Our
- ENABLE_GCC_WARNING macro used the word "warning" as an argument,
- when it is also required as an argument to the compiler pragma.
- Fixes bug 19901; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (compilation, also in 0.2.8.7):
- - Remove an inappropriate "inline" in tortls.c that was causing
- warnings on older versions of GCC. Fixes bug 19903; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (fallback directories, also in 0.2.8.7):
- - Avoid logging a NULL string pointer when loading fallback
- directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
- and 0.2.8.1-alpha. Report and patch by "rubiate".
- o Minor bugfixes (logging):
- - Log a more accurate message when we fail to dump a microdescriptor.
- Fixes bug 17758; bugfix on 0.2.2.8-alpha. Patch from Daniel Pinto.
- o Minor bugfixes (memory leak):
- - Fix a series of slow memory leaks related to parsing torrc files
- and options. Fixes bug 19466; bugfix on 0.2.1.6-alpha.
- o Deprecated features:
- - A number of DNS-cache-related sub-options for client ports are now
- deprecated for security reasons, and may be removed in a future
- version of Tor. (We believe that client-side DNS caching is a bad
- idea for anonymity, and you should not turn it on.) The options
- are: CacheDNS, CacheIPv4DNS, CacheIPv6DNS, UseDNSCache,
- UseIPv4Cache, and UseIPv6Cache.
- - A number of options are deprecated for security reasons, and may
- be removed in a future version of Tor. The options are:
- AllowDotExit, AllowInvalidNodes, AllowSingleHopCircuits,
- AllowSingleHopExits, ClientDNSRejectInternalAddresses,
- CloseHSClientCircuitsImmediatelyOnTimeout,
- CloseHSServiceRendCircuitsImmediatelyOnTimeout,
- ExcludeSingleHopRelays, FastFirstHopPK, TLSECGroup,
- UseNTorHandshake, and WarnUnsafeSocks.
- - The *ListenAddress options are now deprecated as unnecessary: the
- corresponding *Port options should be used instead. These options
- may someday be removed. The affected options are:
- ControlListenAddress, DNSListenAddress, DirListenAddress,
- NATDListenAddress, ORListenAddress, SocksListenAddress,
- and TransListenAddress.
- o Documentation:
- - Correct the IPv6 syntax in our documentation for the
- VirtualAddrNetworkIPv6 torrc option. Closes ticket 19743.
- o Removed code:
- - We no longer include the (dead, deprecated) bufferevent code in
- Tor. Closes ticket 19450. Based on a patch from U+039b.
- Changes in version 0.2.8.7 - 2016-08-24
- Tor 0.2.8.7 fixes an important bug related to the ReachableAddresses
- option in 0.2.8.6, and replaces a retiring bridge authority. Everyone
- who sets the ReachableAddresses option, and all bridges, are strongly
- encouraged to upgrade.
- o Directory authority changes:
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Major bugfixes (client, security):
- - Only use the ReachableAddresses option to restrict the first hop
- in a path. In earlier versions of 0.2.8.x, it would apply to
- every hop in the path, with a possible degradation in anonymity
- for anyone using an uncommon ReachableAddress setting. Fixes bug
- 19973; bugfix on 0.2.8.2-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation):
- - Remove an inappropriate "inline" in tortls.c that was causing
- warnings on older versions of GCC. Fixes bug 19903; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (fallback directories):
- - Avoid logging a NULL string pointer when loading fallback
- directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
- and 0.2.8.1-alpha. Report and patch by "rubiate".
- Changes in version 0.2.9.1-alpha - 2016-08-08
- Tor 0.2.9.1-alpha is the first alpha release in the 0.2.9 development
- series. It improves our support for hardened builds and compiler
- warnings, deploys some critical infrastructure for improvements to
- hidden services, includes a new timing backend that we hope to use for
- better support for traffic padding, makes it easier for programmers to
- log unexpected events, and contains other small improvements to
- security, correctness, and performance.
- Below are the changes since 0.2.8.6.
- o New system requirements:
- - Tor now requires Libevent version 2.0.10-stable or later. Older
- versions of Libevent have less efficient backends for several
- platforms, and lack the DNS code that we use for our server-side
- DNS support. This implements ticket 19554.
- - Tor now requires zlib version 1.2 or later, for security,
- efficiency, and (eventually) gzip support. (Back when we started,
- zlib 1.1 and zlib 1.0 were still found in the wild. 1.2 was
- released in 2003. We recommend the latest version.)
- o Major features (build, hardening):
- - Tor now builds with -ftrapv by default on compilers that support
- it. This option detects signed integer overflow (which C forbids),
- and turns it into a hard-failure. We do not apply this option to
- code that needs to run in constant time to avoid side-channels;
- instead, we use -fwrapv in that code. Closes ticket 17983.
- - When --enable-expensive-hardening is selected, stop applying the
- clang/gcc sanitizers to code that needs to run in constant time.
- Although we are aware of no introduced side-channels, we are not
- able to prove that there are none. Related to ticket 17983.
- o Major features (compilation):
- - Our big list of extra GCC warnings is now enabled by default when
- building with GCC (or with anything like Clang that claims to be
- GCC-compatible). To make all warnings into fatal compilation
- errors, pass --enable-fatal-warnings to configure. Closes
- ticket 19044.
- - Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS to automatically
- turn on C and POSIX extensions. (Previously, we attempted to do
- this on an ad hoc basis.) Closes ticket 19139.
- o Major features (directory authorities, hidden services):
- - Directory authorities can now perform the shared randomness
- protocol specified by proposal 250. Using this protocol, directory
- authorities generate a global fresh random value every day. In the
- future, this value will be used by hidden services to select
- HSDirs. This release implements the directory authority feature;
- the hidden service side will be implemented in the future as part
- of proposal 224. Resolves ticket 16943; implements proposal 250.
- o Major features (downloading, random exponential backoff):
- - When we fail to download an object from a directory service, wait
- for an (exponentially increasing) randomized amount of time before
- retrying, rather than a fixed interval as we did before. This
- prevents a group of Tor instances from becoming too synchronized,
- or a single Tor instance from becoming too predictable, in its
- download schedule. Closes ticket 15942.
- o Major bugfixes (exit policies):
- - Avoid disclosing exit outbound bind addresses, configured port
- bind addresses, and local interface addresses in relay descriptors
- by default under ExitPolicyRejectPrivate. Instead, only reject
- these (otherwise unlisted) addresses if
- ExitPolicyRejectLocalInterfaces is set. Fixes bug 18456; bugfix on
- 0.2.7.2-alpha. Patch by teor.
- o Major bugfixes (hidden service client):
- - Allow Tor clients with appropriate controllers to work with
- FetchHidServDescriptors set to 0. Previously, this option also
- disabled descriptor cache lookup, thus breaking hidden services
- entirely. Fixes bug 18704; bugfix on 0.2.0.20-rc. Patch by "twim".
- o Minor features (build, hardening):
- - Detect and work around a libclang_rt problem that would prevent
- clang from finding __mulodi4() on some 32-bit platforms, and thus
- keep -ftrapv from linking on those systems. Closes ticket 19079.
- - When building on a system without runtime support for the runtime
- hardening options, try to log a useful warning at configuration
- time, rather than an incomprehensible warning at link time. If
- expensive hardening was requested, this warning becomes an error.
- Closes ticket 18895.
- o Minor features (code safety):
- - In our integer-parsing functions, ensure that maxiumum value we
- give is no smaller than the minimum value. Closes ticket 19063;
- patch from U+039b.
- o Minor features (controller):
- - Implement new GETINFO queries for all downloads that use
- download_status_t to schedule retries. This allows controllers to
- examine the schedule for pending downloads. Closes ticket 19323.
- - Allow controllers to configure basic client authorization on
- hidden services when they create them with the ADD_ONION control
- command. Implements ticket 15588. Patch by "special".
- - Fire a STATUS_SERVER controller event whenever the hibernation
- status changes between "awake"/"soft"/"hard". Closes ticket 18685.
- o Minor features (directory authority):
- - Directory authorities now only give the Guard flag to a relay if
- they are also giving it the Stable flag. This change allows us to
- simplify path selection for clients. It should have minimal effect
- in practice, since >99% of Guards already have the Stable flag.
- Implements ticket 18624.
- - Directory authorities now write their v3-status-votes file out to
- disk earlier in the consensus process, so we have a record of the
- votes even if we abort the consensus process. Resolves
- ticket 19036.
- o Minor features (hidden service):
- - Stop being so strict about the payload length of "rendezvous1"
- cells. We used to be locked in to the "TAP" handshake length, and
- now we can handle better handshakes like "ntor". Resolves
- ticket 18998.
- o Minor features (infrastructure, time):
- - Tor now uses the operating system's monotonic timers (where
- available) for internal fine-grained timing. Previously we would
- look at the system clock, and then attempt to compensate for the
- clock running backwards. Closes ticket 18908.
- - Tor now includes an improved timer backend, so that we can
- efficiently support tens or hundreds of thousands of concurrent
- timers, as will be needed for some of our planned anti-traffic-
- analysis work. This code is based on William Ahern's "timeout.c"
- project, which implements a "tickless hierarchical timing wheel".
- Closes ticket 18365.
- o Minor features (logging):
- - Provide a more useful warning message when configured with an
- invalid Nickname. Closes ticket 18300; patch from "icanhasaccount".
- - When dumping unparseable router descriptors, optionally store them
- in separate files, named by digest, up to a configurable size
- limit. You can change the size limit by setting the
- MaxUnparseableDescSizeToLog option, and disable this feature by
- setting that option to 0. Closes ticket 18322.
- - Add a set of macros to check nonfatal assertions, for internal
- use. Migrating more of our checks to these should help us avoid
- needless crash bugs. Closes ticket 18613.
- o Minor features (performance):
- - Changer the "optimistic data" extension from "off by default" to
- "on by default". The default was ordinarily overridden by a
- consensus option, but when clients were bootstrapping for the
- first time, they would not have a consensus to get the option
- from. Changing this default When fetching a consensus for the
- first time, use optimistic data. This saves a round-trip during
- startup. Closes ticket 18815.
- o Minor features (relay, usability):
- - When the directory authorities refuse a bad relay's descriptor,
- encourage the relay operator to contact us. Many relay operators
- won't notice this line in their logs, but it's a win if even a few
- learn why we don't like what their relay was doing. Resolves
- ticket 18760.
- o Minor features (testing):
- - Let backtrace tests work correctly under AddressSanitizer. Fixes
- part of bug 18934; bugfix on 0.2.5.2-alpha.
- - Move the test-network.sh script to chutney, and modify tor's test-
- network.sh to call the (newer) chutney version when available.
- Resolves ticket 19116. Patch by teor.
- - Use the lcov convention for marking lines as unreachable, so that
- we don't count them when we're generating test coverage data.
- Update our coverage tools to understand this convention. Closes
- ticket 16792.
- o Minor bugfixes (bootstrap):
- - Remember the directory we fetched the consensus or previous
- certificates from, and use it to fetch future authority
- certificates. This change improves bootstrapping performance.
- Fixes bug 18963; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (build):
- - The test-stem and test-network makefile targets now depend only on
- the tor binary that they are testing. Previously, they depended on
- "make all". Fixes bug 18240; bugfix on 0.2.8.2-alpha. Based on a
- patch from "cypherpunks".
- o Minor bugfixes (circuits):
- - Make sure extend_info_from_router() is only called on servers.
- Fixes bug 19639; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (compilation):
- - When building with Clang, use a full set of GCC warnings.
- (Previously, we included only a subset, because of the way we
- detected them.) Fixes bug 19216; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (directory authority):
- - Authorities now sort the "package" lines in their votes, for ease
- of debugging. (They are already sorted in consensus documents.)
- Fixes bug 18840; bugfix on 0.2.6.3-alpha.
- - When parsing a detached signature, make sure we use the length of
- the digest algorithm instead of an hardcoded DIGEST256_LEN in
- order to avoid comparing bytes out-of-bounds with a smaller digest
- length such as SHA1. Fixes bug 19066; bugfix on 0.2.2.6-alpha.
- o Minor bugfixes (documentation):
- - Document the --passphrase-fd option in the tor manpage. Fixes bug
- 19504; bugfix on 0.2.7.3-rc.
- - Fix the description of the --passphrase-fd option in the
- tor-gencert manpage. The option is used to pass the number of a
- file descriptor to read the passphrase from, not to read the file
- descriptor from. Fixes bug 19505; bugfix on 0.2.0.20-alpha.
- o Minor bugfixes (ephemeral hidden service):
- - When deleting an ephemeral hidden service, close its intro points
- even if they are not completely open. Fixes bug 18604; bugfix
- on 0.2.7.1-alpha.
- o Minor bugfixes (guard selection):
- - Use a single entry guard even if the NumEntryGuards consensus
- parameter is not provided. Fixes bug 17688; bugfix
- on 0.2.5.6-alpha.
- - Don't mark guards as unreachable if connection_connect() fails.
- That function fails for local reasons, so it shouldn't reveal
- anything about the status of the guard. Fixes bug 14334; bugfix
- on 0.2.3.10-alpha.
- o Minor bugfixes (hidden service client):
- - Increase the minimum number of internal circuits we preemptively
- build from 2 to 3, so a circuit is available when a client
- connects to another onion service. Fixes bug 13239; bugfix
- on 0.1.0.1-rc.
- o Minor bugfixes (logging):
- - When logging a directory ownership mismatch, log the owning
- username correctly. Fixes bug 19578; bugfix on 0.2.2.29-beta.
- o Minor bugfixes (memory leaks):
- - Fix a small, uncommon memory leak that could occur when reading a
- truncated ed25519 key file. Fixes bug 18956; bugfix
- on 0.2.6.1-alpha.
- o Minor bugfixes (testing):
- - Allow clients to retry HSDirs much faster in test networks. Fixes
- bug 19702; bugfix on 0.2.7.1-alpha. Patch by teor.
- - Disable ASAN's detection of segmentation faults while running
- test_bt.sh, so that we can make sure that our own backtrace
- generation code works. Fixes another aspect of bug 18934; bugfix
- on 0.2.5.2-alpha. Patch from "cypherpunks".
- - Fix the test-network-all target on out-of-tree builds by using the
- correct path to the test driver script. Fixes bug 19421; bugfix
- on 0.2.7.3-rc.
- o Minor bugfixes (time):
- - Improve overflow checks in tv_udiff and tv_mdiff. Fixes bug 19483;
- bugfix on all released tor versions.
- - When computing the difference between two times in milliseconds,
- we now round to the nearest millisecond correctly. Previously, we
- could sometimes round in the wrong direction. Fixes bug 19428;
- bugfix on 0.2.2.2-alpha.
- o Minor bugfixes (user interface):
- - Display a more accurate number of suppressed messages in the log
- rate-limiter. Previously, there was a potential integer overflow
- in the counter. Now, if the number of messages hits a maximum, the
- rate-limiter doesn't count any further. Fixes bug 19435; bugfix
- on 0.2.4.11-alpha.
- - Fix a typo in the passphrase prompt for the ed25519 identity key.
- Fixes bug 19503; bugfix on 0.2.7.2-alpha.
- o Code simplification and refactoring:
- - Remove redundant declarations of the MIN macro. Closes
- ticket 18889.
- - Rename tor_dup_addr() to tor_addr_to_str_dup() to avoid confusion.
- Closes ticket 18462; patch from "icanhasaccount".
- - Split the 600-line directory_handle_command_get function into
- separate functions for different URL types. Closes ticket 16698.
- o Documentation:
- - Fix spelling of "--enable-tor2web-mode" in the manpage. Closes
- ticket 19153. Patch from "U+039b".
- o Removed features:
- - Remove support for "GET /tor/bytes.txt" DirPort request, and
- "GETINFO dir-usage" controller request, which were only available
- via a compile-time option in Tor anyway. Feature was added in
- 0.2.2.1-alpha. Resolves ticket 19035.
- - There is no longer a compile-time option to disable support for
- TransPort. (If you don't want TransPort; just don't use it.) Patch
- from "U+039b". Closes ticket 19449.
- o Testing:
- - Run more workqueue tests as part of "make check". These had
- previously been implemented, but you needed to know special
- command-line options to enable them.
- - We now have unit tests for our code to reject zlib "compression
- bombs". (Fortunately, the code works fine.)
- Changes in version 0.2.8.6 - 2016-08-02
- Tor 0.2.8.6 is the first stable version of the Tor 0.2.8 series.
- The Tor 0.2.8 series improves client bootstrapping performance,
- completes the authority-side implementation of improved identity
- keys for relays, and includes numerous bugfixes and performance
- improvements throughout the program. This release continues to
- improve the coverage of Tor's test suite. For a full list of
- changes since Tor 0.2.7, see the ReleaseNotes file.
- Changes since 0.2.8.5-rc:
- o Minor features (geoip):
- - Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation):
- - Fix a compilation warning in the unit tests on systems where char
- is signed. Fixes bug 19682; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (fallback directories):
- - Remove 1 fallback that was on the hardcoded list, then opted-out,
- leaving 89 of the 100 fallbacks originally introduced in Tor
- 0.2.8.2-alpha in March 2016. Closes ticket 19782; patch by teor.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Allow more syscalls when running with "Sandbox 1" enabled:
- sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
- some systems, these are required for Tor to start. Fixes bug
- 18397; bugfix on 0.2.5.1-alpha. Patch from Daniel Pinto.
- - Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
- so that get_interface_address6_via_udp_socket_hack() can work.
- Fixes bug 19660; bugfix on 0.2.5.1-alpha.
- Changes in version 0.2.8.5-rc - 2016-07-07
- Tor 0.2.8.5-rc is the second release candidate in the Tor 0.2.8
- series. If we find no new bugs or regressions here, the first stable
- 0.2.8 release will be identical to it. It has a few small bugfixes
- against previous versions.
- o Directory authority changes:
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Major bugfixes (heartbeat):
- - Fix a regression that would crash Tor when the periodic
- "heartbeat" log messages were disabled. Fixes bug 19454; bugfix on
- 0.2.8.1-alpha. Reported by "kubaku".
- o Minor features (build):
- - Tor now again builds with the recent OpenSSL 1.1 development
- branch (tested against 1.1.0-pre6-dev). Closes ticket 19499.
- - When building manual pages, set the timezone to "UTC", so that the
- output is reproducible. Fixes bug 19558; bugfix on 0.2.2.9-alpha.
- Patch from intrigeri.
- o Minor bugfixes (fallback directory selection):
- - Avoid errors during fallback selection if there are no eligible
- fallbacks. Fixes bug 19480; bugfix on 0.2.8.3-alpha. Patch
- by teor.
- o Minor bugfixes (IPv6, microdescriptors):
- - Don't check node addresses when we only have a routerstatus. This
- allows IPv6-only clients to bootstrap by fetching microdescriptors
- from fallback directory mirrors. (The microdescriptor consensus
- has no IPv6 addresses in it.) Fixes bug 19608; bugfix
- on 0.2.8.2-alpha.
- o Minor bugfixes (logging):
- - Reduce pointlessly verbose log messages when directory servers
- can't be found. Fixes bug 18849; bugfix on 0.2.8.3-alpha and
- 0.2.8.1-alpha. Patch by teor.
- - When a fallback directory changes its fingerprint from the hard-
- coded fingerprint, log a less severe, more explanatory log
- message. Fixes bug 18812; bugfix on 0.2.8.1-alpha. Patch by teor.
- o Minor bugfixes (Linux seccomp2 sandboxing):
- - Allow statistics to be written to disk when "Sandbox 1" is
- enabled. Fixes bugs 19556 and 19957; bugfix on 0.2.5.1-alpha and
- 0.2.6.1-alpha respectively.
- o Minor bugfixes (user interface):
- - Remove a warning message "Service [scrubbed] not found after
- descriptor upload". This message appears when one uses HSPOST
- control command to upload a service descriptor. Since there is
- only a descriptor and no service, showing this message is
- pointless and confusing. Fixes bug 19464; bugfix on 0.2.7.2-alpha.
- o Fallback directory list:
- - Add a comment to the generated fallback directory list that
- explains how to comment out unsuitable fallbacks in a way that's
- compatible with the stem fallback parser.
- - Update fallback whitelist and blacklist based on relay operator
- emails. Blacklist unsuitable (non-working, over-volatile)
- fallbacks. Resolves ticket 19071. Patch by teor.
- - Remove 10 unsuitable fallbacks, leaving 90 of the 100 fallbacks
- originally introduced in Tor 0.2.8.2-alpha in March 2016. Closes
- ticket 19071; patch by teor.
- Changes in version 0.2.8.4-rc - 2016-06-15
- Tor 0.2.8.4-rc is the first release candidate in the Tor 0.2.8 series.
- If we find no new bugs or regressions here, the first stable 0.2.8
- release will be identical to it. It has a few small bugfixes against
- previous versions.
- o Major bugfixes (user interface):
- - Correctly give a warning in the cases where a relay is specified
- by nickname, and one such relay is found, but it is not officially
- Named. Fixes bug 19203; bugfix on 0.2.3.1-alpha.
- o Minor features (build):
- - Tor now builds once again with the recent OpenSSL 1.1 development
- branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev).
- o Minor features (geoip):
- - Update geoip and geoip6 to the June 7 2016 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation):
- - Cause the unit tests to compile correctly on mingw64 versions that
- lack sscanf. Fixes bug 19213; bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (downloading):
- - Predict more correctly whether we'll be downloading over HTTP when
- we determine the maximum length of a URL. This should avoid a
- "BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
- bug 19191.
- Changes in version 0.2.8.3-alpha - 2016-05-26
- Tor 0.2.8.3-alpha resolves several bugs, most of them introduced over
- the course of the 0.2.8 development cycle. It improves the behavior of
- directory clients, fixes several crash bugs, fixes a gap in compiler
- hardening, and allows the full integration test suite to run on
- more platforms.
- o Major bugfixes (security, client, DNS proxy):
- - Stop a crash that could occur when a client running with DNSPort
- received a query with multiple address types, and the first
- address type was not supported. Found and fixed by Scott Dial.
- Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- o Major bugfixes (security, compilation):
- - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
- is predefined. Previously, our use of -D_FORTIFY_SOURCE would
- cause a compiler warning, thereby making other checks fail, and
- needlessly disabling compiler-hardening support. Fixes one case of
- bug 18841; bugfix on 0.2.3.17-beta. Patch from "trudokal".
- o Major bugfixes (security, directory authorities):
- - Fix a crash and out-of-bounds write during authority voting, when
- the list of relays includes duplicate ed25519 identity keys. Fixes
- bug 19032; bugfix on 0.2.8.2-alpha.
- o Major bugfixes (client, bootstrapping):
- - Check if bootstrap consensus downloads are still needed when the
- linked connection attaches. This prevents tor making unnecessary
- begindir-style connections, which are the only directory
- connections tor clients make since the fix for 18483 was merged.
- - Fix some edge cases where consensus download connections may not
- have been closed, even though they were not needed. Related to fix
- for 18809.
- - Make relays retry consensus downloads the correct number of times,
- rather than the more aggressive client retry count. Fixes part of
- ticket 18809.
- - Stop downloading consensuses when we have a consensus, even if we
- don't have all the certificates for it yet. Fixes bug 18809;
- bugfix on 0.2.8.1-alpha. Patches by arma and teor.
- o Major bugfixes (directory mirrors):
- - Decide whether to advertise begindir support in the the same way
- we decide whether to advertise our DirPort. Allowing these
- decisions to become out-of-sync led to surprising behavior like
- advertising begindir support when hibernation made us not
- advertise a DirPort. Resolves bug 18616; bugfix on 0.2.8.1-alpha.
- Patch by teor.
- o Major bugfixes (IPv6 bridges, client):
- - Actually use IPv6 addresses when selecting directory addresses for
- IPv6 bridges. Fixes bug 18921; bugfix on 0.2.8.1-alpha. Patch
- by "teor".
- o Major bugfixes (key management):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (testing):
- - Fix a bug that would block 'make test-network-all' on systems where
- IPv6 packets were lost. Fixes bug 19008; bugfix on 0.2.7.3-rc.
- - Avoid "WSANOTINITIALISED" warnings in the unit tests. Fixes bug 18668;
- bugfix on 0.2.8.1-alpha.
- o Minor features (clients):
- - Make clients, onion services, and bridge relays always use an
- encrypted begindir connection for directory requests. Resolves
- ticket 18483. Patch by "teor".
- o Minor features (fallback directory mirrors):
- - Give each fallback the same weight for client selection; restrict
- fallbacks to one per operator; report fallback directory detail
- changes when rebuilding list; add new fallback directory mirrors
- to the whitelist; and many other minor simplifications and fixes.
- Closes tasks 17905, 18749, bug 18689, and fixes part of bug 18812 on
- 0.2.8.1-alpha; patch by "teor".
- - Replace the 21 fallbacks generated in January 2016 and included in
- Tor 0.2.8.1-alpha, with a list of 100 fallbacks generated in March
- 2016. Closes task 17158; patch by "teor".
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 4 2016 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (assert, portability):
- - Fix an assertion failure in memarea.c on systems where "long" is
- shorter than the size of a pointer. Fixes bug 18716; bugfix
- on 0.2.1.1-alpha.
- o Minor bugfixes (bootstrap):
- - Consistently use the consensus download schedule for authority
- certificates. Fixes bug 18816; bugfix on 0.2.4.13-alpha.
- o Minor bugfixes (build):
- - Remove a pair of redundant AM_CONDITIONAL declarations from
- configure.ac. Fixes one final case of bug 17744; bugfix
- on 0.2.8.2-alpha.
- - Resolve warnings when building on systems that are concerned with
- signed char. Fixes bug 18728; bugfix on 0.2.7.2-alpha
- and 0.2.6.1-alpha.
- - When libscrypt.h is found, but no libscrypt library can be linked,
- treat libscrypt as absent. Fixes bug 19161; bugfix
- on 0.2.6.1-alpha.
- o Minor bugfixes (client):
- - Turn all TestingClientBootstrap* into non-testing torrc options.
- This changes simply renames them by removing "Testing" in front of
- them and they do not require TestingTorNetwork to be enabled
- anymore. Fixes bug 18481; bugfix on 0.2.8.1-alpha.
- - Make directory node selection more reliable, mainly for IPv6-only
- clients and clients with few reachable addresses. Fixes bug 18929;
- bugfix on 0.2.8.1-alpha. Patch by "teor".
- o Minor bugfixes (controller, microdescriptors):
- - Make GETINFO dir/status-vote/current/consensus conform to the
- control specification by returning "551 Could not open cached
- consensus..." when not caching consensuses. Fixes bug 18920;
- bugfix on 0.2.2.6-alpha.
- o Minor bugfixes (crypto, portability):
- - The SHA3 and SHAKE routines now produce the correct output on Big
- Endian systems. No code calls either algorithm yet, so this is
- primarily a build fix. Fixes bug 18943; bugfix on 0.2.8.1-alpha.
- - Tor now builds again with the recent OpenSSL 1.1 development
- branch (tested against 1.1.0-pre4 and 1.1.0-pre5-dev). Closes
- ticket 18286.
- o Minor bugfixes (directories):
- - When fetching extrainfo documents, compare their SHA256 digests
- and Ed25519 signing key certificates with the routerinfo that led
- us to fetch them, rather than with the most recent routerinfo.
- Otherwise we generate many spurious warnings about mismatches.
- Fixes bug 17150; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (logging):
- - When we can't generate a signing key because OfflineMasterKey is
- set, do not imply that we should have been able to load it. Fixes
- bug 18133; bugfix on 0.2.7.2-alpha.
- - Stop periodic_event_dispatch() from blasting twelve lines per
- second at loglevel debug. Fixes bug 18729; fix on 0.2.8.1-alpha.
- - When rejecting a misformed INTRODUCE2 cell, only log at
- PROTOCOL_WARN severity. Fixes bug 18761; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (pluggable transports):
- - Avoid reporting a spurious error when we decide that we don't need
- to terminate a pluggable transport because it has already exited.
- Fixes bug 18686; bugfix on 0.2.5.5-alpha.
- o Minor bugfixes (pointer arithmetic):
- - Fix a bug in memarea_alloc() that could have resulted in remote
- heap write access, if Tor had ever passed an unchecked size to
- memarea_alloc(). Fortunately, all the sizes we pass to
- memarea_alloc() are pre-checked to be less than 128 kilobytes.
- Fixes bug 19150; bugfix on 0.2.1.1-alpha. Bug found by
- Guido Vranken.
- o Minor bugfixes (relays):
- - Consider more config options when relays decide whether to
- regenerate their descriptor. Fixes more of bug 12538; bugfix
- on 0.2.8.1-alpha.
- - Resolve some edge cases where we might launch an ORPort
- reachability check even when DisableNetwork is set. Noticed while
- fixing bug 18616; bugfix on 0.2.3.9-alpha.
- o Minor bugfixes (statistics):
- - We now include consensus downloads via IPv6 in our directory-
- request statistics. Fixes bug 18460; bugfix on 0.2.3.14-alpha.
- o Minor bugfixes (testing):
- - Allow directories in small networks to bootstrap by skipping
- DirPort checks when the consensus has no exits. Fixes bug 19003;
- bugfix on 0.2.8.1-alpha. Patch by teor.
- - Fix a small memory leak that would occur when the
- TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
- bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (time handling):
- - When correcting a corrupt 'struct tm' value, fill in the tm_wday
- field. Otherwise, our unit tests crash on Windows. Fixes bug
- 18977; bugfix on 0.2.2.25-alpha.
- o Documentation:
- - Document the contents of the 'datadir/keys' subdirectory in the
- manual page. Closes ticket 17621.
- - Stop recommending use of nicknames to identify relays in our
- MapAddress documentation. Closes ticket 18312.
- Changes in version 0.2.8.2-alpha - 2016-03-28
- Tor 0.2.8.2-alpha is the second alpha in its series. It fixes numerous
- bugs in earlier versions of Tor, including some that prevented
- authorities using Tor 0.2.7.x from running correctly. IPv6 and
- directory support should also be much improved.
- o New system requirements:
- - Tor no longer supports versions of OpenSSL with a broken
- implementation of counter mode. (This bug was present in OpenSSL
- 1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
- longer runs with, these versions.
- - Tor no longer attempts to support platforms where the "time_t"
- type is unsigned. (To the best of our knowledge, only OpenVMS does
- this, and Tor has never actually built on OpenVMS.) Closes
- ticket 18184.
- - Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
- later (released in 2008 and 2009 respectively). If you are
- building Tor from the git repository instead of from the source
- distribution, and your tools are older than this, you will need to
- upgrade. Closes ticket 17732.
- o Major bugfixes (security, pointers):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (bridges, pluggable transports):
- - Modify the check for OR connections to private addresses. Allow
- bridges on private addresses, including pluggable transports that
- ignore the (potentially private) address in the bridge line. Fixes
- bug 18517; bugfix on 0.2.8.1-alpha. Reported by gk, patch by teor.
- o Major bugfixes (compilation):
- - Repair hardened builds under the clang compiler. Previously, our
- use of _FORTIFY_SOURCE would conflict with clang's address
- sanitizer. Fixes bug 14821; bugfix on 0.2.5.4-alpha.
- o Major bugfixes (crash on shutdown):
- - Correctly handle detaching circuits from muxes when shutting down.
- Fixes bug 18116; bugfix on 0.2.8.1-alpha.
- - Fix an assert-on-exit bug related to counting memory usage in
- rephist.c. Fixes bug 18651; bugfix on 0.2.8.1-alpha.
- o Major bugfixes (crash on startup):
- - Fix a segfault during startup: If a Unix domain socket was
- configured as listener (such as a ControlSocket or a SocksPort
- "unix:" socket), and tor was started as root but not configured to
- switch to another user, tor would segfault while trying to string
- compare a NULL value. Fixes bug 18261; bugfix on 0.2.8.1-alpha.
- Patch by weasel.
- o Major bugfixes (dns proxy mode, crash):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (relays, bridge clients):
- - Ensure relays always allow IPv4 OR and Dir connections. Ensure
- bridge clients use the address configured in the bridge line.
- Fixes bug 18348; bugfix on 0.2.8.1-alpha. Reported by sysrqb,
- patch by teor.
- o Major bugfixes (voting):
- - Actually enable support for authorities to match routers by their
- Ed25519 identities. Previously, the code had been written, but
- some debugging code that had accidentally been left in the
- codebase made it stay turned off. Fixes bug 17702; bugfix
- on 0.2.7.2-alpha.
- - When collating votes by Ed25519 identities, authorities now
- include a "NoEdConsensus" flag if the ed25519 value (or lack
- thereof) for a server does not reflect the majority consensus.
- Related to bug 17668; bugfix on 0.2.7.2-alpha.
- - When generating a vote with keypinning disabled, never include two
- entries for the same ed25519 identity. This bug was causing
- authorities to generate votes that they could not parse when a
- router violated key pinning by changing its RSA identity but
- keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
- 18318. Bugfix on 0.2.7.2-alpha.
- o Minor features (security, win32):
- - Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
- attack. Fixes bug 18123; bugfix on all tor versions. Patch
- by teor.
- o Minor features (bug-resistance):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (build):
- - Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
- as having possible IPFW support. Closes ticket 18448. Patch from
- Steven Chamberlain.
- o Minor features (code hardening):
- - Use tor_snprintf() and tor_vsnprintf() even in external and low-
- level code, to harden against accidental failures to NUL-
- terminate. Part of ticket 17852. Patch from jsturgix. Found
- with Flawfinder.
- o Minor features (crypto):
- - Validate the hard-coded Diffie-Hellman parameters and ensure that
- p is a safe prime, and g is a suitable generator. Closes
- ticket 18221.
- o Minor features (geoip):
- - Update geoip and geoip6 to the March 3 2016 Maxmind GeoLite2
- Country database.
- o Minor features (hidden service directory):
- - Streamline relay-side hsdir handling: when relays consider whether
- to accept an uploaded hidden service descriptor, they no longer
- check whether they are one of the relays in the network that is
- "supposed" to handle that descriptor. Implements ticket 18332.
- o Minor features (IPv6):
- - Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
- to 1, tor prefers IPv6 directory addresses.
- - Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
- avoids using IPv4 for client OR and directory connections.
- - Try harder to obey the IP version restrictions "ClientUseIPv4 0",
- "ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
- "ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
- o Minor features (linux seccomp2 sandbox):
- - Reject attempts to change our Address with "Sandbox 1" enabled.
- Changing Address with Sandbox turned on would never actually work,
- but previously it would fail in strange and confusing ways. Found
- while fixing 18548.
- o Minor features (robustness):
- - Exit immediately with an error message if the code attempts to use
- Libevent without having initialized it. This should resolve some
- frequently-made mistakes in our unit tests. Closes ticket 18241.
- o Minor features (unix domain sockets):
- - Add a new per-socket option, RelaxDirModeCheck, to allow creating
- Unix domain sockets without checking the permissions on the parent
- directory. (Tor checks permissions by default because some
- operating systems only check permissions on the parent directory.
- However, some operating systems do look at permissions on the
- socket, and tor's default check is unneeded.) Closes ticket 18458.
- Patch by weasel.
- o Minor bugfixes (exit policies, security):
- - Refresh an exit relay's exit policy when interface addresses
- change. Previously, tor only refreshed the exit policy when the
- configured external address changed. Fixes bug 18208; bugfix on
- 0.2.7.3-rc. Patch by teor.
- o Minor bugfixes (security, hidden services):
- - Prevent hidden services connecting to client-supplied rendezvous
- addresses that are reserved as internal or multicast. Fixes bug
- 8976; bugfix on 0.2.3.21-rc. Patch by dgoulet and teor.
- o Minor bugfixes (build):
- - Do not link the unit tests against both the testing and non-
- testing versions of the static libraries. Fixes bug 18490; bugfix
- on 0.2.7.1-alpha.
- - Avoid spurious failures from configure files related to calling
- exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18626; bugfix on
- 0.2.0.1-alpha. Patch from "cypherpunks".
- - Silence spurious clang-scan warnings in the ed25519_donna code by
- explicitly initializing some objects. Fixes bug 18384; bugfix on
- 0.2.7.2-alpha. Patch by teor.
- o Minor bugfixes (client, bootstrap):
- - Count receipt of new microdescriptors as progress towards
- bootstrapping. Previously, with EntryNodes set, Tor might not
- successfully repopulate the guard set on bootstrapping. Fixes bug
- 16825; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (code correctness):
- - Update to the latest version of Trunnel, which tries harder to
- avoid generating code that can invoke memcpy(p,NULL,0). Bug found
- by clang address sanitizer. Fixes bug 18373; bugfix
- on 0.2.7.2-alpha.
- o Minor bugfixes (configuration):
- - Fix a tiny memory leak when parsing a port configuration ending in
- ":auto". Fixes bug 18374; bugfix on 0.2.3.3-alpha.
- o Minor bugfixes (containers):
- - If we somehow attempt to construct a heap with more than
- 1073741822 elements, avoid an integer overflow when maintaining
- the heap property. Fixes bug 18296; bugfix on 0.1.2.1-alpha.
- o Minor bugfixes (correctness):
- - Fix a bad memory handling bug that would occur if we had queued a
- cell on a channel's incoming queue. Fortunately, we can't actually
- queue a cell like that as our code is constructed today, but it's
- best to avoid this kind of error, even if there isn't any code
- that triggers it today. Fixes bug 18570; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (directory):
- - When generating a URL for a directory server on an IPv6 address,
- wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
- on 0.2.3.9-alpha. Patch from Malek.
- o Minor bugfixes (fallback directory mirrors):
- - When requesting extrainfo descriptors from a trusted directory
- server, check whether it is an authority or a fallback directory
- which supports extrainfo descriptors. Fixes bug 18489; bugfix on
- 0.2.4.7-alpha. Reported by atagar, patch by teor.
- o Minor bugfixes (hidden service, client):
- - Handle the case where the user makes several fast consecutive
- requests to the same .onion address. Previously, the first six
- requests would each trigger a descriptor fetch, each picking a
- directory (there are 6 overall) and the seventh one would fail
- because no directories were left, thereby triggering a close on
- all current directory connections asking for the hidden service.
- The solution here is to not close the connections if we have
- pending directory fetches. Fixes bug 15937; bugfix
- on 0.2.7.1-alpha.
- o Minor bugfixes (hidden service, control port):
- - Add the onion address to the HS_DESC event for the UPLOADED action
- both on success or failure. It was previously hardcoded with
- UNKNOWN. Fixes bug 16023; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (hidden service, directory):
- - Bridges now refuse "rendezvous2" (hidden service descriptor)
- publish attempts. Suggested by ticket 18332.
- o Minor bugfixes (linux seccomp2 sandbox):
- - Allow the setrlimit syscall, and the prlimit and prlimit64
- syscalls, which some libc implementations use under the hood.
- Fixes bug 15221; bugfix on 0.2.5.1-alpha.
- - Avoid a 10-second delay when starting as a client with "Sandbox 1"
- enabled and no DNS resolvers configured. This should help TAILS
- start up faster. Fixes bug 18548; bugfix on 0.2.5.1-alpha.
- - Fix the sandbox's interoperability with unix domain sockets under
- setuid. Fixes bug 18253; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (logging):
- - When logging information about an unparsable networkstatus vote or
- consensus, do not say "vote" when we mean consensus. Fixes bug
- 18368; bugfix on 0.2.0.8-alpha.
- - Scrub service name in "unrecognized service ID" log messages.
- Fixes bug 18600; bugfix on 0.2.4.11-alpha.
- - Downgrade logs and backtraces about IP versions to info-level.
- Only log backtraces once each time tor runs. Assists in diagnosing
- bug 18351; bugfix on 0.2.8.1-alpha. Reported by sysrqb and
- Christian, patch by teor.
- o Minor bugfixes (memory safety):
- - Avoid freeing an uninitialized pointer when opening a socket fails
- in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
- 0.2.3.11-alpha. Reported by toralf and "cypherpunks", patch
- by teor.
- - Correctly duplicate addresses in get_interface_address6_list().
- Fixes bug 18454; bugfix on 0.2.8.1-alpha. Reported by toralf,
- patch by "cypherpunks".
- - Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
- on 0.2.0.1-alpha.
- - Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
- 18672; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (private directory):
- - Prevent a race condition when creating private directories. Fixes
- part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
- Patch from jsturgix. Found with Flawfinder.
- o Minor bugfixes (test networks, IPv6):
- - Allow internal IPv6 addresses in descriptors in test networks.
- Fixes bug 17153; bugfix on 0.2.3.16-alpha. Patch by teor, reported
- by karsten.
- o Minor bugfixes (testing):
- - We no longer disable assertions in the unit tests when coverage is
- enabled. Instead, we require you to say --disable-asserts-in-tests
- to the configure script if you need assertions disabled in the
- unit tests (for example, if you want to perform branch coverage).
- Fixes bug 18242; bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (time parsing):
- - Avoid overflow in tor_timegm when parsing dates in and after 2038
- on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
- 0.0.2pre14. Patch by teor.
- o Minor bugfixes (tor-gencert):
- - Correctly handle the case where an authority operator enters a
- passphrase but sends an EOF before sending a newline. Fixes bug
- 17443; bugfix on 0.2.0.20-rc. Found by junglefowl.
- o Code simplification and refactoring:
- - Quote all the string interpolations in configure.ac -- even those
- which we are pretty sure can't contain spaces. Closes ticket
- 17744. Patch from zerosion.
- - Remove specialized code for non-inplace AES_CTR. 99% of our AES is
- inplace, so there's no need to have a separate implementation for
- the non-inplace code. Closes ticket 18258. Patch from Malek.
- - Simplify return types for some crypto functions that can't
- actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
- o Documentation:
- - Change build messages to refer to "Fedora" instead of "Fedora
- Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
- Patches from "icanhasaccount" and "cypherpunks".
- o Removed features:
- - We no longer maintain an internal freelist in memarea.c.
- Allocators should be good enough to make this code unnecessary,
- and it's doubtful that it ever had any performance benefit.
- o Testing:
- - Fix several warnings from clang's address sanitizer produced in
- the unit tests.
- - Treat backtrace test failures as expected on FreeBSD until we
- solve bug 17808. Closes ticket 18204.
- Changes in version 0.2.8.1-alpha - 2016-02-04
- Tor 0.2.8.1-alpha is the first alpha release in its series. It
- includes numerous small features and bugfixes against previous Tor
- versions, and numerous small infrastructure improvements. The most
- notable features are a set of improvements to the directory subsystem.
- o Major features (security, Linux):
- - When Tor starts as root on Linux and is told to switch user ID, it
- can now retain the capability to bind to low ports. By default,
- Tor will do this only when it's switching user ID and some low
- ports have been configured. You can change this behavior with the
- new option KeepBindCapabilities. Closes ticket 8195.
- o Major features (directory system):
- - When bootstrapping multiple consensus downloads at a time, use the
- first one that starts downloading, and close the rest. This
- reduces failures when authorities or fallback directories are slow
- or down. Together with the code for feature 15775, this feature
- should reduces failures due to fallback churn. Implements ticket
- 4483. Patch by "teor". Implements IPv4 portions of proposal 210 by
- "mikeperry" and "teor".
- - Include a trial list of 21 default fallback directories, generated
- in January 2016, based on an opt-in survey of suitable relays.
- Doing this should make clients bootstrap more quickly and reliably,
- and reduce the load on the directory authorities. Closes ticket
- 15775. Patch by "teor".
- Candidates identified using an OnionOO script by "weasel", "teor",
- "gsathya", and "karsten".
- - Previously only relays that explicitly opened a directory port
- (DirPort) accepted directory requests from clients. Now all
- relays, with and without a DirPort, accept and serve tunneled
- directory requests that they receive through their ORPort. You can
- disable this behavior using the new DirCache option. Closes
- ticket 12538.
- o Major key updates:
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Minor features (security, clock):
- - Warn when the system clock appears to move back in time (when the
- state file was last written in the future). Tor doesn't know that
- consensuses have expired if the clock is in the past. Patch by
- "teor". Implements ticket 17188.
- o Minor features (security, exit policies):
- - ExitPolicyRejectPrivate now rejects more private addresses by
- default. Specifically, it now rejects the relay's outbound bind
- addresses (if configured), and the relay's configured port
- addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
- 0.2.0.11-alpha. Patch by "teor".
- o Minor features (security, memory erasure):
- - Set the unused entries in a smartlist to NULL. This helped catch
- a (harmless) bug, and shouldn't affect performance too much.
- Implements ticket 17026.
- - Use SecureMemoryWipe() function to securely clean memory on
- Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
- Implements feature 17986.
- - Use explicit_bzero or memset_s when present. Previously, we'd use
- OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
- from <logan@hackers.mu> and <selven@hackers.mu>.
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (security, RNG):
- - Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
- positively are not allowed to fail. Previously we depended on
- internal details of OpenSSL's behavior. Closes ticket 17686.
- - Never use the system entropy output directly for anything besides
- seeding the PRNG. When we want to generate important keys, instead
- of using system entropy directly, we now hash it with the PRNG
- stream. This may help resist certain attacks based on broken OS
- entropy implementations. Closes part of ticket 17694.
- - Use modern system calls (like getentropy() or getrandom()) to
- generate strong entropy on platforms that have them. Closes
- ticket 13696.
- o Minor features (accounting):
- - Added two modes to the AccountingRule option: One for limiting
- only the number of bytes sent ("AccountingRule out"), and one for
- limiting only the number of bytes received ("AccountingRule in").
- Closes ticket 15989; patch from "unixninja92".
- o Minor features (build):
- - Since our build process now uses "make distcheck", we no longer
- force "make dist" to depend on "make check". Closes ticket 17893;
- patch from "cypherpunks."
- - Tor now builds successfully with the recent OpenSSL 1.1
- development branch, and with the latest LibreSSL. Closes tickets
- 17549, 17921, and 17984.
- o Minor features (controller):
- - Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
- tickets 16774 and 17817. Patch by George Tankersley.
- - New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
- service descriptor from a service's local hidden service
- descriptor cache. Closes ticket 14846.
- - Add 'GETINFO exit-policy/reject-private/[default,relay]', so
- controllers can examine the the reject rules added by
- ExitPolicyRejectPrivate. This makes it easier for stem to display
- exit policies.
- o Minor features (crypto):
- - Add SHA512 support to crypto.c. Closes ticket 17663; patch from
- George Tankersley.
- - Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
- - When allocating a digest state object, allocate no more space than
- we actually need. Previously, we would allocate as much space as
- the state for the largest algorithm would need. This change saves
- up to 672 bytes per circuit. Closes ticket 17796.
- - Improve performance when hashing non-multiple of 8 sized buffers,
- based on Andrew Moon's public domain SipHash-2-4 implementation.
- Fixes bug 17544; bugfix on 0.2.5.3-alpha.
- o Minor features (directory downloads):
- - Wait for busy authorities and fallback directories to become non-
- busy when bootstrapping. (A similar change was made in 6c443e987d
- for directory caches chosen from the consensus.) Closes ticket
- 17864; patch by "teor".
- - Add UseDefaultFallbackDirs, which enables any hard-coded fallback
- directory mirrors. The default is 1; set it to 0 to disable
- fallbacks. Implements ticket 17576. Patch by "teor".
- o Minor features (geoip):
- - Update geoip and geoip6 to the January 5 2016 Maxmind GeoLite2
- Country database.
- o Minor features (IPv6):
- - Add an argument 'ipv6=address:orport' to the DirAuthority and
- FallbackDir torrc options, to specify an IPv6 address for an
- authority or fallback directory. Add hard-coded ipv6 addresses for
- directory authorities that have them. Closes ticket 17327; patch
- from Nick Mathewson and "teor".
- - Add address policy assume_action support for IPv6 addresses.
- - Limit IPv6 mask bits to 128.
- - Warn when comparing against an AF_UNSPEC address in a policy, it's
- almost always a bug. Closes ticket 17863; patch by "teor".
- - Allow users to configure directory authorities and fallback
- directory servers with IPv6 addresses and ORPorts. Resolves
- ticket 6027.
- - routerset_parse now accepts IPv6 literal addresses. Fixes bug
- 17060; bugfix on 0.2.1.3-alpha. Patch by "teor".
- - Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
- 17638; bugfix on 0.0.2pre8. Patch by "teor".
- o Minor features (logging):
- - When logging to syslog, allow a tag to be added to the syslog
- identity (the string prepended to every log message). The tag can
- be configured with SyslogIdentityTag and defaults to none. Setting
- it to "foo" will cause logs to be tagged as "Tor-foo". Closes
- ticket 17194.
- o Minor features (portability):
- - Use timingsafe_memcmp() where available. Closes ticket 17944;
- patch from <logan@hackers.mu>.
- o Minor features (relay, address discovery):
- - Add a family argument to get_interface_addresses_raw() and
- subfunctions to make network interface address interogation more
- efficient. Now Tor can specifically ask for IPv4, IPv6 or both
- types of interfaces from the operating system. Resolves
- ticket 17950.
- - When get_interface_address6_list(.,AF_UNSPEC,.) is called and
- fails to enumerate interface addresses using the platform-specific
- API, have it rely on the UDP socket fallback technique to try and
- find out what IP addresses (both IPv4 and IPv6) our machine has.
- Resolves ticket 17951.
- o Minor features (replay cache):
- - The replay cache now uses SHA256 instead of SHA1. Implements
- feature 8961. Patch by "teor", issue reported by "rransom".
- o Minor features (unix file permissions):
- - Defer creation of Unix sockets until after setuid. This avoids
- needing CAP_CHOWN and CAP_FOWNER when using systemd's
- CapabilityBoundingSet, or chown and fowner when using SELinux.
- Implements part of ticket 17562. Patch from Jamie Nguyen.
- - If any directory created by Tor is marked as group readable, the
- filesystem group is allowed to be either the default GID or the
- root user. Allowing root to read the DataDirectory prevents the
- need for CAP_READ_SEARCH when using systemd's
- CapabilityBoundingSet, or dac_read_search when using SELinux.
- Implements part of ticket 17562. Patch from Jamie Nguyen.
- - Introduce a new DataDirectoryGroupReadable option. If it is set to
- 1, the DataDirectory will be made readable by the default GID.
- Implements part of ticket 17562. Patch from Jamie Nguyen.
- o Minor bugfixes (accounting):
- - The max bandwidth when using 'AccountRule sum' is now correctly
- logged. Fixes bug 18024; bugfix on 0.2.6.1-alpha. Patch
- from "unixninja92".
- o Minor bugfixes (code correctness):
- - When closing an entry connection, generate a warning if we should
- have sent an end cell for it but we haven't. Fixes bug 17876;
- bugfix on 0.2.3.2-alpha.
- - Assert that allocated memory held by the reputation code is freed
- according to its internal counters. Fixes bug 17753; bugfix
- on 0.1.1.1-alpha.
- - Assert when the TLS contexts fail to initialize. Fixes bug 17683;
- bugfix on 0.0.6.
- o Minor bugfixes (compilation):
- - Mark all object files that include micro-revision.i as depending
- on it, so as to make parallel builds more reliable. Fixes bug
- 17826; bugfix on 0.2.5.1-alpha.
- - Don't try to use the pthread_condattr_setclock() function unless
- it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
- 17819; bugfix on 0.2.6.3-alpha.
- - Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
- on 0.2.5.2-alpha.
- - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
- bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
- - Fix search for libevent libraries on OpenBSD (and other systems
- that install libevent 1 and libevent 2 in parallel). Fixes bug
- 16651; bugfix on 0.1.0.7-rc. Patch from "rubiate".
- - Isolate environment variables meant for tests from the rest of the
- build system. Fixes bug 17818; bugfix on 0.2.7.3-rc.
- - Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
- on 0.0.2pre8.
- - Remove config.log only from make distclean, not from make clean.
- Fixes bug 17924; bugfix on 0.2.4.1-alpha.
- o Minor bugfixes (crypto):
- - Check the return value of HMAC() and assert on failure. Fixes bug
- 17658; bugfix on 0.2.3.6-alpha. Patch by "teor".
- o Minor bugfixes (fallback directories):
- - Mark fallbacks as "too busy" when they return a 503 response,
- rather than just marking authorities. Fixes bug 17572; bugfix on
- 0.2.4.7-alpha. Patch by "teor".
- o Minor bugfixes (IPv6):
- - Update the limits in max_dl_per_request for IPv6 address length.
- Fixes bug 17573; bugfix on 0.2.1.5-alpha.
- o Minor bugfixes (linux seccomp2 sandbox):
- - Fix a crash when using offline master ed25519 keys with the Linux
- seccomp2 sandbox enabled. Fixes bug 17675; bugfix on 0.2.7.3-rc.
- o Minor bugfixes (logging):
- - In log messages that include a function name, use __FUNCTION__
- instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
- with clang __PRETTY_FUNCTION__ has extra information we don't
- need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
- der Woerdt.
- - Remove needless quotes from a log message about unparseable
- addresses. Fixes bug 17843; bugfix on 0.2.3.3-alpha.
- o Minor bugfixes (portability):
- - Remove an #endif from configure.ac so that we correctly detect the
- presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
- on 0.2.0.13-alpha.
- o Minor bugfixes (relays):
- - Check that both the ORPort and DirPort (if present) are reachable
- before publishing a relay descriptor. Otherwise, relays publish a
- descriptor with DirPort 0 when the DirPort reachability test takes
- longer than the ORPort reachability test. Fixes bug 18050; bugfix
- on 0.1.0.1-rc. Reported by "starlight", patch by "teor".
- o Minor bugfixes (relays, hidden services):
- - Refuse connection requests to private OR addresses unless
- ExtendAllowPrivateAddresses is set. Previously, tor would connect,
- then refuse to send any cells to a private address. Fixes bugs
- 17674 and 8976; bugfix on 0.2.3.21-rc. Patch by "teor".
- o Minor bugfixes (safe logging):
- - When logging a malformed hostname received through socks4, scrub
- it if SafeLogging says we should. Fixes bug 17419; bugfix
- on 0.1.1.16-rc.
- o Minor bugfixes (statistics code):
- - Consistently check for overflow in round_*_to_next_multiple_of
- functions, and add unit tests with additional and maximal values.
- Fixes part of bug 13192; bugfix on 0.2.2.1-alpha.
- - Handle edge cases in the laplace functions: avoid division by
- zero, avoid taking the log of zero, and silence clang type
- conversion warnings using round and trunc. Add unit tests for edge
- cases with maximal values. Fixes part of bug 13192; bugfix
- on 0.2.6.2-alpha.
- o Minor bugfixes (testing):
- - The test for log_heartbeat was incorrectly failing in timezones
- with non-integer offsets. Instead of comparing the end of the time
- string against a constant, compare it to the output of
- format_local_iso_time when given the correct input. Fixes bug
- 18039; bugfix on 0.2.5.4-alpha.
- - Make unit tests pass on IPv6-only systems, and systems without
- localhost addresses (like some FreeBSD jails). Fixes bug 17632;
- bugfix on 0.2.7.3-rc. Patch by "teor".
- - Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
- on 0.2.4.8-alpha.
- - Check the full results of SHA256 and SHA512 digests in the unit
- tests. Bugfix on 0.2.2.4-alpha. Patch by "teor".
- o Code simplification and refactoring:
- - Move logging of redundant policy entries in
- policies_parse_exit_policy_internal into its own function. Closes
- ticket 17608; patch from "juce".
- - Extract the more complicated parts of circuit_mark_for_close()
- into a new function that we run periodically before circuits are
- freed. This change removes more than half of the functions
- currently in the "blob". Closes ticket 17218.
- - Clean up a little duplicated code in
- crypto_expand_key_material_TAP(). Closes ticket 17587; patch
- from "pfrankw".
- - Decouple the list of streams waiting to be attached to circuits
- from the overall connection list. This change makes it possible to
- attach streams quickly while simplifying Tor's callgraph and
- avoiding O(N) scans of the entire connection list. Closes
- ticket 17590.
- - When a direct directory request fails immediately on launch,
- instead of relaunching that request from inside the code that
- launches it, instead mark the connection for teardown. This change
- simplifies Tor's callback and prevents the directory-request
- launching code from invoking itself recursively. Closes
- ticket 17589
- - Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
- use them. Closes ticket 17926.
- o Documentation:
- - Add a description of the correct use of the '--keygen' command-
- line option. Closes ticket 17583; based on text by 's7r'.
- - Document the minimum HeartbeatPeriod value. Closes ticket 15638.
- - Explain actual minima for BandwidthRate. Closes ticket 16382.
- - Fix a minor formatting typo in the manpage. Closes ticket 17791.
- - Mention torspec URL in the manpage and point the reader to it
- whenever we mention a document that belongs in torspce. Fixes
- issue 17392.
- o Removed features:
- - Remove client-side support for connecting to Tor relays running
- versions of Tor before 0.2.3.6-alpha. These relays didn't support
- the v3 TLS handshake protocol, and are no longer allowed on the
- Tor network. Implements the client side of ticket 11150. Based on
- patches by Tom van der Woerdt.
- o Testing:
- - Add unit tests to check for common RNG failure modes, such as
- returning all zeroes, identical values, or incrementing values
- (OpenSSL's rand_predictable feature). Patch by "teor".
- - Log more information when the backtrace tests fail. Closes ticket
- 17892. Patch from "cypherpunks."
- - Always test both ed25519 backends, so that we can be sure that our
- batch-open replacement code works. Part of ticket 16794.
- - Cover dns_resolve_impl() in dns.c with unit tests. Implements a
- portion of ticket 16831.
- - More unit tests for compat_libevent.c, procmon.c, tortls.c,
- util_format.c, directory.c, and options_validate.c. Closes tickets
- 17075, 17082, 17084, 17003, and 17076 respectively. Patches from
- Ola Bini.
- - Unit tests for directory_handle_command_get. Closes ticket 17004.
- Patch from Reinaldo de Souza Jr.
- Changes in version 0.2.7.6 - 2015-12-10
- Tor version 0.2.7.6 fixes a major bug in entry guard selection, as
- well as a minor bug in hidden service reliability.
- o Major bugfixes (guard selection):
- - Actually look at the Guard flag when selecting a new directory
- guard. When we implemented the directory guard design, we
- accidentally started treating all relays as if they have the Guard
- flag during guard selection, leading to weaker anonymity and worse
- performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
- by Mohsen Imani.
- o Minor features (geoip):
- - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation):
- - When checking for net/pfvar.h, include netinet/in.h if possible.
- This fixes transparent proxy detection on OpenBSD. Fixes bug
- 17551; bugfix on 0.1.2.1-alpha. Patch from "rubiate".
- - Fix a compilation warning with Clang 3.6: Do not check the
- presence of an address which can never be NULL. Fixes bug 17781.
- o Minor bugfixes (correctness):
- - When displaying an IPv6 exit policy, include the mask bits
- correctly even when the number is greater than 31. Fixes bug
- 16056; bugfix on 0.2.4.7-alpha. Patch from "gturner".
- - The wrong list was used when looking up expired intro points in a
- rend service object, causing what we think could be reachability
- issues for hidden services, and triggering a BUG log. Fixes bug
- 16702; bugfix on 0.2.7.2-alpha.
- - Fix undefined behavior in the tor_cert_checksig function. Fixes
- bug 17722; bugfix on 0.2.7.2-alpha.
- Changes in version 0.2.7.5 - 2015-11-20
- The Tor 0.2.7 release series is dedicated to the memory of Tor user
- and privacy advocate Caspar Bowden (1961-2015). Caspar worked
- tirelessly to advocate human rights regardless of national borders,
- and oppose the encroachments of mass surveillance. He opposed national
- exceptionalism, he brought clarity to legal and policy debates, he
- understood and predicted the impact of mass surveillance on the world,
- and he laid the groundwork for resisting it. While serving on the Tor
- Project's board of directors, he brought us his uncompromising focus
- on technical excellence in the service of humankind. Caspar was an
- inimitable force for good and a wonderful friend. He was kind,
- humorous, generous, gallant, and believed we should protect one
- another without exception. We honor him here for his ideals, his
- efforts, and his accomplishments. Please honor his memory with works
- that would make him proud.
- Tor 0.2.7.5 is the first stable release in the Tor 0.2.7 series.
- The 0.2.7 series adds a more secure identity key type for relays,
- improves cryptography performance, resolves several longstanding
- hidden-service performance issues, improves controller support for
- hidden services, and includes small bugfixes and performance
- improvements throughout the program. This release series also includes
- more tests than before, and significant simplifications to which parts
- of Tor invoke which others.
- (This release contains no code changes since 0.2.7.4-rc.)
- Changes in version 0.2.7.4-rc - 2015-10-21
- Tor 0.2.7.4-rc is the second release candidate in the 0.2.7 series. It
- fixes some important memory leaks, and a scary-looking (but mostly
- harmless in practice) invalid-read bug. It also has a few small
- bugfixes, notably fixes for compilation and portability on different
- platforms. If no further significant bounds are found, the next
- release will the the official stable release.
- o Major bugfixes (security, correctness):
- - Fix an error that could cause us to read 4 bytes before the
- beginning of an openssl string. This bug could be used to cause
- Tor to crash on systems with unusual malloc implementations, or
- systems with unusual hardening installed. Fixes bug 17404; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (correctness):
- - Fix a use-after-free bug in validate_intro_point_failure(). Fixes
- bug 17401; bugfix on 0.2.7.3-rc.
- o Major bugfixes (memory leaks):
- - Fix a memory leak in ed25519 batch signature checking. Fixes bug
- 17398; bugfix on 0.2.6.1-alpha.
- - Fix a memory leak in rend_cache_failure_entry_free(). Fixes bug
- 17402; bugfix on 0.2.7.3-rc.
- - Fix a memory leak when reading an expired signing key from disk.
- Fixes bug 17403; bugfix on 0.2.7.2-rc.
- o Minor features (geoIP):
- - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation):
- - Repair compilation with the most recent (unreleased, alpha)
- vesions of OpenSSL 1.1. Fixes part of ticket 17237.
- - Fix an integer overflow warning in test_crypto_slow.c. Fixes bug
- 17251; bugfix on 0.2.7.2-alpha.
- - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
- bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
- o Minor bugfixes (portability):
- - Use libexecinfo on FreeBSD to enable backtrace support. Fixes
- part of bug 17151; bugfix on 0.2.5.2-alpha. Patch from
- Marcin Cieślak.
- o Minor bugfixes (sandbox):
- - Add the "hidserv-stats" filename to our sandbox filter for the
- HiddenServiceStatistics option to work properly. Fixes bug 17354;
- bugfix on 0.2.6.2-alpha. Patch from David Goulet.
- o Minor bugfixes (testing):
- - Add unit tests for get_interface_address* failure cases. Fixes bug
- 17173; bugfix on 0.2.7.3-rc. Patch by fk/teor.
- - Fix breakage when running 'make check' with BSD make. Fixes bug
- 17154; bugfix on 0.2.7.3-rc. Patch by Marcin Cieślak.
- - Make the get_ifaddrs_* unit tests more tolerant of different
- network configurations. (Don't assume every test box has an IPv4
- address, and don't assume every test box has a non-localhost
- address.) Fixes bug 17255; bugfix on 0.2.7.3-rc. Patch by "teor".
- - Skip backtrace tests when backtrace support is not compiled in.
- Fixes part of bug 17151; bugfix on 0.2.7.1-alpha. Patch from
- Marcin Cieślak.
- o Documentation:
- - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
- - Note that HiddenServicePorts can take a unix domain socket. Closes
- ticket 17364.
- Changes in version 0.2.7.3-rc - 2015-09-25
- Tor 0.2.7.3-rc is the first release candidate in the 0.2.7 series. It
- contains numerous usability fixes for Ed25519 keys, safeguards against
- several misconfiguration problems, significant simplifications to
- Tor's callgraph, and numerous bugfixes and small features.
- This is the most tested release of Tor to date. The unit tests cover
- 39.40% of the code, and the integration tests (accessible with "make
- test-full-online", requiring stem and chutney and a network
- connection) raise the coverage to 64.49%.
- o Major features (security, hidden services):
- - Hidden services, if using the EntryNodes option, are required to
- use more than one EntryNode, in order to avoid a guard discovery
- attack. (This would only affect people who had configured hidden
- services and manually specified the EntryNodes option with a
- single entry-node. The impact was that it would be easy to
- remotely identify the guard node used by such a hidden service.
- See ticket for more information.) Fixes ticket 14917.
- o Major features (Ed25519 keys, keypinning):
- - The key-pinning option on directory authorities is now advisory-
- only by default. In a future version, or when the AuthDirPinKeys
- option is set, pins are enforced again. Disabling key-pinning
- seemed like a good idea so that we can survive the fallout of any
- usability problems associated with Ed25519 keys. Closes
- ticket 17135.
- o Major features (Ed25519 performance):
- - Improve the speed of Ed25519 operations and Curve25519 keypair
- generation when built targeting 32 bit x86 platforms with SSE2
- available. Implements ticket 16535.
- - Improve the runtime speed of Ed25519 signature verification by
- using Ed25519-donna's batch verification support. Implements
- ticket 16533.
- o Major features (performance testing):
- - The test-network.sh script now supports performance testing.
- Requires corresponding chutney performance testing changes. Patch
- by "teor". Closes ticket 14175.
- o Major features (relay, Ed25519):
- - Significant usability improvements for Ed25519 key management. Log
- messages are better, and the code can recover from far more
- failure conditions. Thanks to "s7r" for reporting and diagnosing
- so many of these!
- - Add a new OfflineMasterKey option to tell Tor never to try loading
- or generating a secret Ed25519 identity key. You can use this in
- combination with tor --keygen to manage offline and/or encrypted
- Ed25519 keys. Implements ticket 16944.
- - Add a --newpass option to allow changing or removing the
- passphrase of an encrypted key with tor --keygen. Implements part
- of ticket 16769.
- - On receiving a HUP signal, check to see whether the Ed25519
- signing key has changed, and reload it if so. Closes ticket 16790.
- o Major bugfixes (relay, Ed25519):
- - Avoid crashing on 'tor --keygen'. Fixes bug 16679; bugfix on
- 0.2.7.2-alpha. Reported by "s7r".
- - Improve handling of expired signing keys with offline master keys.
- Fixes bug 16685; bugfix on 0.2.7.2-alpha. Reported by "s7r".
- o Minor features (client-side privacy):
- - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
- lifespan when IsolateSOCKSAuth and streams with SOCKS
- authentication are attached to the circuit. This allows
- applications like TorBrowser to manage circuit lifetime on their
- own. Implements feature 15482.
- - When logging malformed hostnames from SOCKS5 requests, respect
- SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
- o Minor features (compilation):
- - Give a warning as early as possible when trying to build with an
- unsupported OpenSSL version. Closes ticket 16901.
- - Fail during configure if we're trying to build against an OpenSSL
- built without ECC support. Fixes bug 17109, bugfix on 0.2.7.1-alpha
- which started requiring ECC.
- o Minor features (geoip):
- - Update geoip and geoip6 to the September 3 2015 Maxmind GeoLite2
- Country database.
- o Minor features (hidden services):
- - Relays need to have the Fast flag to get the HSDir flag. As this
- is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
- drop. This change should make some attacks against the hidden
- service directory system harder. Fixes ticket 15963.
- - Turn on hidden service statistics collection by setting the torrc
- option HiddenServiceStatistics to "1" by default. (This keeps
- track only of the fraction of traffic used by hidden services, and
- the total number of hidden services in existence.) Closes
- ticket 15254.
- - Client now uses an introduction point failure cache to know when
- to fetch or keep a descriptor in their cache. Previously, failures
- were recorded implicitly, but not explicitly remembered. Closes
- ticket 16389.
- o Minor features (testing, authorities, documentation):
- - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
- explicitly manage consensus flags in testing networks. Patch by
- "robgjansen", modified by "teor". Implements part of ticket 14882.
- o Minor bugfixes (security, exit policies):
- - ExitPolicyRejectPrivate now also rejects the relay's published
- IPv6 address (if any), and any publicly routable IPv4 or IPv6
- addresses on any local interfaces. ticket 17027. Patch by "teor".
- Fixes bug 17027; bugfix on 0.2.0.11-alpha.
- o Minor bug fixes (torrc exit policies):
- - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
- produce IPv6 wildcard addresses. Previously they would produce
- both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
- of bug 16069; bugfix on 0.2.4.7-alpha.
- - When parsing torrc ExitPolicies, we now warn for a number of cases
- where the user's intent is likely to differ from Tor's actual
- behavior. These include: using an IPv4 address with an accept6 or
- reject6 line; using "private" on an accept6 or reject6 line; and
- including any ExitPolicy lines after accept *:* or reject *:*.
- Related to ticket 16069.
- - When parsing torrc ExitPolicies, we now issue an info-level
- message when expanding an "accept/reject *" line to include both
- IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
- - In each instance above, usage advice is provided to avoid the
- message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
- 16069; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (authority):
- - Don't assign "HSDir" to a router if it isn't Valid and Running.
- Fixes bug 16524; bugfix on 0.2.7.2-alpha.
- - Downgrade log messages about Ed25519 key issues if they are in old
- cached router descriptors. Fixes part of bug 16286; bugfix
- on 0.2.7.2-alpha.
- - When we find an Ed25519 key issue in a cached descriptor, stop
- saying the descriptor was just "uploaded". Fixes another part of
- bug 16286; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (control port):
- - Repair a warning and a spurious result when getting the maximum
- number of file descriptors from the controller. Fixes bug 16697;
- bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (correctness):
- - When calling channel_free_list(), avoid calling smartlist_remove()
- while inside a FOREACH loop. This partially reverts commit
- 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
- incorrectly removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (documentation):
- - Advise users on how to configure separate IPv4 and IPv6 exit
- policies in the manpage and sample torrcs. Related to ticket 16069.
- - Fix the usage message of tor-resolve(1) so that it no longer lists
- the removed -F option. Fixes bug 16913; bugfix on 0.2.2.28-beta.
- - Fix an error in the manual page and comments for
- TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
- required "ORPort connectivity". While this is true, it is in no
- way unique to the HSDir flag. Of all the flags, only HSDirs need a
- DirPort configured in order for the authorities to assign that
- particular flag. Patch by "teor". Fixed as part of 14882; bugfix
- on 0.2.6.3-alpha.
- o Minor bugfixes (Ed25519):
- - Fix a memory leak when reading router descriptors with expired
- Ed25519 certificates. Fixes bug 16539; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (linux seccomp2 sandbox):
- - Allow bridge authorities to run correctly under the seccomp2
- sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
- - Allow routers with ed25519 keys to run correctly under the
- seccomp2 sandbox. Fixes bug 16965; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (open file limit):
- - Fix set_max_file_descriptors() to set by default the max open file
- limit to the current limit when setrlimit() fails. Fixes bug
- 16274; bugfix on 0.2.0.10-alpha. Patch by dgoulet.
- o Minor bugfixes (portability):
- - Try harder to normalize the exit status of the Tor process to the
- standard-provided range. Fixes bug 16975; bugfix on every version
- of Tor ever.
- - Check correctly for Windows socket errors in the workqueue
- backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
- - Fix the behavior of crypto_rand_time_range() when told to consider
- times before 1970. (These times were possible when running in a
- simulated network environment where time()'s output starts at
- zero.) Fixes bug 16980; bugfix on 0.2.7.1-alpha.
- - Restore correct operation of TLS client-cipher detection on
- OpenSSL 1.1. Fixes bug 14047; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (relay):
- - Ensure that worker threads actually exit when a fatal error or
- shutdown is indicated. This fix doesn't currently affect the
- behavior of Tor, because Tor workers never indicates fatal error
- or shutdown except in the unit tests. Fixes bug 16868; bugfix
- on 0.2.6.3-alpha.
- - Unblock threads before releasing the work queue mutex to ensure
- predictable scheduling behavior. Fixes bug 16644; bugfix
- on 0.2.6.3-alpha.
- o Code simplification and refactoring:
- - Change the function that's called when we need to retry all
- downloads so that it only reschedules the downloads to happen
- immediately, rather than launching them all at once itself. This
- further simplifies Tor's callgraph.
- - Move some format-parsing functions out of crypto.c and
- crypto_curve25519.c into crypto_format.c and/or util_format.c.
- - Move the client-only parts of init_keys() into a separate
- function. Closes ticket 16763.
- - Simplify the microdesc_free() implementation so that it no longer
- appears (to code analysis tools) to potentially invoke a huge
- suite of other microdesc functions.
- - Simply the control graph further by deferring the inner body of
- directory_all_unreachable() into a callback. Closes ticket 16762.
- - Treat the loss of an owning controller as equivalent to a SIGTERM
- signal. This removes a tiny amount of duplicated code, and
- simplifies our callgraph. Closes ticket 16788.
- - When generating an event to send to the controller, we no longer
- put the event over the network immediately. Instead, we queue
- these events, and use a Libevent callback to deliver them. This
- change simplifies Tor's callgraph by reducing the number of
- functions from which all other Tor functions are reachable. Closes
- ticket 16695.
- - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
- that try to scan or compile every file on Unix won't decide that
- they are broken.
- - Remove the unused "nulterminate" argument from buf_pullup().
- o Documentation:
- - Recommend a 40 GB example AccountingMax in torrc.sample rather
- than a 4 GB max. Closes ticket 16742.
- - Include the TUNING document in our source tarball. It is referred
- to in the ChangeLog and an error message. Fixes bug 16929; bugfix
- on 0.2.6.1-alpha.
- o Removed code:
- - The internal pure-C tor-fw-helper tool is now removed from the Tor
- distribution, in favor of the pure-Go clone available from
- https://gitweb.torproject.org/tor-fw-helper.git/ . The libraries
- used by the C tor-fw-helper are not, in our opinion, very
- confidence- inspiring in their secure-programming techniques.
- Closes ticket 13338.
- - Remove the code that would try to aggressively flush controller
- connections while writing to them. This code was introduced in
- 0.1.2.7-alpha, in order to keep output buffers from exceeding
- their limits. But there is no longer a maximum output buffer size,
- and flushing data in this way caused some undesirable recursions
- in our call graph. Closes ticket 16480.
- o Testing:
- - Make "bridges+hs" the default test network. This tests almost all
- tor functionality during make test-network, while allowing tests
- to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
- test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
- (chutney). Patches by "teor".
- - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
- by-side in the same parent directory. Closes ticket 16903. Patch
- by "teor".
- - Use environment variables rather than autoconf substitutions to
- send variables from the build system to the test scripts. This
- change should be easier to maintain, and cause 'make distcheck' to
- work better than before. Fixes bug 17148.
- - Add a new set of callgraph analysis scripts that use clang to
- produce a list of which Tor functions are reachable from which
- other Tor functions. We're planning to use these to help simplify
- our code structure by identifying illogical dependencies.
- - Add new 'test-full' and 'test-full-online' targets to run all
- tests, including integration tests with stem and chutney.
- - Make the test-workqueue test work on Windows by initializing the
- network before we begin.
- - New make target (make test-network-all) to run multiple applicable
- chutney test cases. Patch from Teor; closes 16953.
- - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
- functions in dns.c. Implements a portion of ticket 16831.
- - When building Tor with testing coverage enabled, run Chutney tests
- (if any) using the 'tor-cov' coverage binary.
- - When running test-network or test-stem, check for the absence of
- stem/chutney before doing any build operations.
- Changes in version 0.2.7.2-alpha - 2015-07-27
- This, the second alpha in the Tor 0.2.7 series, has a number of new
- features, including a way to manually pick the number of introduction
- points for hidden services, and the much stronger Ed25519 signing key
- algorithm for regular Tor relays (including support for encrypted
- offline identity keys in the new algorithm).
- Support for Ed25519 on relays is currently limited to signing router
- descriptors; later alphas in this series will extend Ed25519 key
- support to more parts of the Tor protocol.
- o Major features (Ed25519 identity keys, Proposal 220):
- - All relays now maintain a stronger identity key, using the Ed25519
- elliptic curve signature format. This master key is designed so
- that it can be kept offline. Relays also generate an online
- signing key, and a set of other Ed25519 keys and certificates.
- These are all automatically regenerated and rotated as needed.
- Implements part of ticket 12498.
- - Directory authorities now vote on Ed25519 identity keys along with
- RSA1024 keys. Implements part of ticket 12498.
- - Directory authorities track which Ed25519 identity keys have been
- used with which RSA1024 identity keys, and do not allow them to
- vary freely. Implements part of ticket 12498.
- - Microdescriptors now include Ed25519 identity keys. Implements
- part of ticket 12498.
- - Add support for offline encrypted Ed25519 master keys. To use this
- feature on your tor relay, run "tor --keygen" to make a new master
- key (or to make a new signing key if you already have a master
- key). Closes ticket 13642.
- o Major features (Hidden services):
- - Add the torrc option HiddenServiceNumIntroductionPoints, to
- specify a fixed number of introduction points. Its maximum value
- is 10 and default is 3. Using this option can increase a hidden
- service's reliability under load, at the cost of making it more
- visible that the hidden service is facing extra load. Closes
- ticket 4862.
- - Remove the adaptive algorithm for choosing the number of
- introduction points, which used to change the number of
- introduction points (poorly) depending on the number of
- connections the HS sees. Closes ticket 4862.
- o Major features (onion key cross-certification):
- - Relay descriptors now include signatures of their own identity
- keys, made using the TAP and ntor onion keys. These signatures
- allow relays to prove ownership of their own onion keys. Because
- of this change, microdescriptors will no longer need to include
- RSA identity keys. Implements proposal 228; closes ticket 12499.
- o Major features (performance):
- - Improve the runtime speed of Ed25519 operations by using the
- public-domain Ed25519-donna by Andrew M. ("floodyberry").
- Implements ticket 16467.
- - Improve the runtime speed of the ntor handshake by using an
- optimized curve25519 basepoint scalarmult implementation from the
- public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
- ideas by Adam Langley. Implements ticket 9663.
- o Major bugfixes (client-side privacy, also in 0.2.6.9):
- - Properly separate out each SOCKSPort when applying stream
- isolation. The error occurred because each port's session group
- was being overwritten by a default value when the listener
- connection was initialized. Fixes bug 16247; bugfix on
- 0.2.6.3-alpha. Patch by "jojelino".
- o Major bugfixes (hidden service clients, stability, also in 0.2.6.10):
- - Stop refusing to store updated hidden service descriptors on a
- client. This reverts commit 9407040c59218 (which indeed fixed bug
- 14219, but introduced a major hidden service reachability
- regression detailed in bug 16381). This is a temporary fix since
- we can live with the minor issue in bug 14219 (it just results in
- some load on the network) but the regression of 16381 is too much
- of a setback. First-round fix for bug 16381; bugfix
- on 0.2.6.3-alpha.
- o Major bugfixes (hidden services):
- - When cannibalizing a circuit for an introduction point, always
- extend to the chosen exit node (creating a 4 hop circuit).
- Previously Tor would use the current circuit exit node, which
- changed the original choice of introduction point, and could cause
- the hidden service to skip excluded introduction points or
- reconnect to a skipped introduction point. Fixes bug 16260; bugfix
- on 0.1.0.1-rc.
- o Major bugfixes (open file limit):
- - The open file limit wasn't checked before calling
- tor_accept_socket_nonblocking(), which would make Tor exceed the
- limit. Now, before opening a new socket, Tor validates the open
- file limit just before, and if the max has been reached, return an
- error. Fixes bug 16288; bugfix on 0.1.1.1-alpha.
- o Major bugfixes (stability, also in 0.2.6.10):
- - Stop crashing with an assertion failure when parsing certain kinds
- of malformed or truncated microdescriptors. Fixes bug 16400;
- bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
- by "cypherpunks_backup".
- - Stop random client-side assertion failures that could occur when
- connecting to a busy hidden service, or connecting to a hidden
- service while a NEWNYM is in progress. Fixes bug 16013; bugfix
- on 0.1.0.1-rc.
- o Minor features (directory authorities, security, also in 0.2.6.9):
- - The HSDir flag given by authorities now requires the Stable flag.
- For the current network, this results in going from 2887 to 2806
- HSDirs. Also, it makes it harder for an attacker to launch a sybil
- attack by raising the effort for a relay to become Stable to
- require at the very least 7 days, while maintaining the 96 hours
- uptime requirement for HSDir. Implements ticket 8243.
- o Minor features (client):
- - Relax the validation of hostnames in SOCKS5 requests, allowing the
- character '_' to appear, in order to cope with domains observed in
- the wild that are serving non-RFC compliant records. Resolves
- ticket 16430.
- - Relax the validation done to hostnames in SOCKS5 requests, and
- allow a single trailing '.' to cope with clients that pass FQDNs
- using that syntax to explicitly indicate that the domain name is
- fully-qualified. Fixes bug 16674; bugfix on 0.2.6.2-alpha.
- - Add GroupWritable and WorldWritable options to unix-socket based
- SocksPort and ControlPort options. These options apply to a single
- socket, and override {Control,Socks}SocketsGroupWritable. Closes
- ticket 15220.
- o Minor features (control protocol):
- - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
- the control protocol. Resolves ticket 15358.
- o Minor features (directory authorities):
- - Directory authorities no longer vote against the "Fast", "Stable",
- and "HSDir" flags just because they were going to vote against
- "Running": if the consensus turns out to be that the router was
- running, then the authority's vote should count. Patch from Peter
- Retzlaff; closes issue 8712.
- o Minor features (geoip, also in 0.2.6.10):
- - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
- o Minor features (hidden services):
- - Add the new options "HiddenServiceMaxStreams" and
- "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
- limit the maximum number of simultaneous streams per circuit, and
- optionally tear down the circuit when the limit is exceeded. Part
- of ticket 16052.
- o Minor features (portability):
- - Use C99 variadic macros when the compiler is not GCC. This avoids
- failing compilations on MSVC, and fixes a log-file-based race
- condition in our old workarounds. Original patch from Gisle Vanem.
- o Minor bugfixes (compilation, also in 0.2.6.9):
- - Build with --enable-systemd correctly when libsystemd is
- installed, but systemd is not. Fixes bug 16164; bugfix on
- 0.2.6.3-alpha. Patch from Peter Palfrader.
- o Minor bugfixes (controller):
- - Add the descriptor ID in each HS_DESC control event. It was
- missing, but specified in control-spec.txt. Fixes bug 15881;
- bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (crypto error-handling, also in 0.2.6.10):
- - Check for failures from crypto_early_init, and refuse to continue.
- A previous typo meant that we could keep going with an
- uninitialized crypto library, and would have OpenSSL initialize
- its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
- when implementing ticket 4900. Patch by "teor".
- o Minor bugfixes (hidden services):
- - Fix a crash when reloading configuration while at least one
- configured and one ephemeral hidden service exists. Fixes bug
- 16060; bugfix on 0.2.7.1-alpha.
- - Avoid crashing with a double-free bug when we create an ephemeral
- hidden service but adding it fails for some reason. Fixes bug
- 16228; bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
- defined. Patch by "teor". Fixes bug 16515; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.10):
- - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
- these when eventfd2() support is missing. Fixes bug 16363; bugfix
- on 0.2.6.3-alpha. Patch from "teor".
- o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.9):
- - Fix sandboxing to work when running as a relay, by allowing the
- renaming of secret_id_key, and allowing the eventfd2 and futex
- syscalls. Fixes bug 16244; bugfix on 0.2.6.1-alpha. Patch by
- Peter Palfrader.
- - Allow systemd connections to work with the Linux seccomp2 sandbox
- code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
- Peter Palfrader.
- o Minor bugfixes (relay):
- - Fix a rarely-encountered memory leak when failing to initialize
- the thread pool. Fixes bug 16631; bugfix on 0.2.6.3-alpha. Patch
- from "cypherpunks".
- o Minor bugfixes (systemd):
- - Fix an accidental formatting error that broke the systemd
- configuration file. Fixes bug 16152; bugfix on 0.2.7.1-alpha.
- - Tor's systemd unit file no longer contains extraneous spaces.
- These spaces would sometimes confuse tools like deb-systemd-
- helper. Fixes bug 16162; bugfix on 0.2.5.5-alpha.
- o Minor bugfixes (tests):
- - Use the configured Python executable when running test-stem-full.
- Fixes bug 16470; bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (tests, also in 0.2.6.9):
- - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
- 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
- o Minor bugfixes (threads, comments):
- - Always initialize return value in compute_desc_id in rendcommon.c
- Patch by "teor". Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
- - Check for NULL values in getinfo_helper_onions(). Patch by "teor".
- Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
- - Remove undefined directive-in-macro in test_util_writepid clang
- 3.7 complains that using a preprocessor directive inside a macro
- invocation in test_util_writepid in test_util.c is undefined.
- Patch by "teor". Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
- o Code simplification and refactoring:
- - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
- to ensure they remain consistent and visible everywhere.
- - Remove some vestigial workarounds for the MSVC6 compiler. We
- haven't supported that in ages.
- - The link authentication code has been refactored for better
- testability and reliability. It now uses code generated with the
- "trunnel" binary encoding generator, to reduce the risk of bugs
- due to programmer error. Done as part of ticket 12498.
- o Documentation:
- - Include a specific and (hopefully) accurate documentation of the
- torrc file's meta-format in doc/torrc_format.txt. This is mainly
- of interest to people writing programs to parse or generate torrc
- files. This document is not a commitment to long-term
- compatibility; some aspects of the current format are a bit
- ridiculous. Closes ticket 2325.
- o Removed features:
- - Tor no longer supports copies of OpenSSL that are missing support
- for Elliptic Curve Cryptography. (We began using ECC when
- available in 0.2.4.8-alpha, for more safe and efficient key
- negotiation.) In particular, support for at least one of P256 or
- P224 is now required, with manual configuration needed if only
- P224 is available. Resolves ticket 16140.
- - Tor no longer supports versions of OpenSSL before 1.0. (If you are
- on an operating system that has not upgraded to OpenSSL 1.0 or
- later, and you compile Tor from source, you will need to install a
- more recent OpenSSL to link Tor against.) These versions of
- OpenSSL are still supported by the OpenSSL, but the numerous
- cryptographic improvements in later OpenSSL releases makes them a
- clear choice. Resolves ticket 16034.
- - Remove the HidServDirectoryV2 option. Now all relays offer to
- store hidden service descriptors. Related to 16543.
- - Remove the VoteOnHidServDirectoriesV2 option, since all
- authorities have long set it to 1. Closes ticket 16543.
- o Testing:
- - Document use of coverity, clang static analyzer, and clang dynamic
- undefined behavior and address sanitizers in doc/HACKING. Include
- detailed usage instructions in the blacklist. Patch by "teor".
- Closes ticket 15817.
- - The link authentication protocol code now has extensive tests.
- - The relay descriptor signature testing code now has
- extensive tests.
- - The test_workqueue program now runs faster, and is enabled by
- default as a part of "make check".
- - Now that OpenSSL has its own scrypt implementation, add an unit
- test that checks for interoperability between libscrypt_scrypt()
- and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
- and rely on EVP_PBE_scrypt() whenever possible. Resolves
- ticket 16189.
- Changes in version 0.2.6.10 - 2015-07-12
- Tor version 0.2.6.10 fixes some significant stability and hidden
- service client bugs, bulletproofs the cryptography init process, and
- fixes a bug when using the sandbox code with some older versions of
- Linux. Everyone running an older version, especially an older version
- of 0.2.6, should upgrade.
- o Major bugfixes (hidden service clients, stability):
- - Stop refusing to store updated hidden service descriptors on a
- client. This reverts commit 9407040c59218 (which indeed fixed bug
- 14219, but introduced a major hidden service reachability
- regression detailed in bug 16381). This is a temporary fix since
- we can live with the minor issue in bug 14219 (it just results in
- some load on the network) but the regression of 16381 is too much
- of a setback. First-round fix for bug 16381; bugfix
- on 0.2.6.3-alpha.
- o Major bugfixes (stability):
- - Stop crashing with an assertion failure when parsing certain kinds
- of malformed or truncated microdescriptors. Fixes bug 16400;
- bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
- by "cypherpunks_backup".
- - Stop random client-side assertion failures that could occur when
- connecting to a busy hidden service, or connecting to a hidden
- service while a NEWNYM is in progress. Fixes bug 16013; bugfix
- on 0.1.0.1-rc.
- o Minor features (geoip):
- - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
- o Minor bugfixes (crypto error-handling):
- - Check for failures from crypto_early_init, and refuse to continue.
- A previous typo meant that we could keep going with an
- uninitialized crypto library, and would have OpenSSL initialize
- its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
- when implementing ticket 4900. Patch by "teor".
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
- these when eventfd2() support is missing. Fixes bug 16363; bugfix
- on 0.2.6.3-alpha. Patch from "teor".
- Changes in version 0.2.6.9 - 2015-06-11
- Tor 0.2.6.9 fixes a regression in the circuit isolation code, increases the
- requirements for receiving an HSDir flag, and addresses some other small
- bugs in the systemd and sandbox code. Clients using circuit isolation
- should upgrade; all directory authorities should upgrade.
- o Major bugfixes (client-side privacy):
- - Properly separate out each SOCKSPort when applying stream
- isolation. The error occurred because each port's session group was
- being overwritten by a default value when the listener connection
- was initialized. Fixes bug 16247; bugfix on 0.2.6.3-alpha. Patch
- by "jojelino".
- o Minor feature (directory authorities, security):
- - The HSDir flag given by authorities now requires the Stable flag.
- For the current network, this results in going from 2887 to 2806
- HSDirs. Also, it makes it harder for an attacker to launch a sybil
- attack by raising the effort for a relay to become Stable which
- takes at the very least 7 days to do so and by keeping the 96
- hours uptime requirement for HSDir. Implements ticket 8243.
- o Minor bugfixes (compilation):
- - Build with --enable-systemd correctly when libsystemd is
- installed, but systemd is not. Fixes bug 16164; bugfix on
- 0.2.6.3-alpha. Patch from Peter Palfrader.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Fix sandboxing to work when running as a relaymby renaming of
- secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
- bug 16244; bugfix on 0.2.6.1-alpha. Patch by Peter Palfrader.
- - Allow systemd connections to work with the Linux seccomp2 sandbox
- code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
- Peter Palfrader.
- o Minor bugfixes (tests):
- - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
- 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
- Changes in version 0.2.6.8 - 2015-05-21
- Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
- fixes an authority-side bug in assigning the HSDir flag. All directory
- authorities should upgrade.
- o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
- - Revert commit that made directory authorities assign the HSDir
- flag to relays without a DirPort; this was bad because such relays
- can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
- on 0.2.6.3-alpha.
- o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
- a client authorized hidden service. Fixes bug 15823; bugfix
- on 0.2.1.6-alpha.
- o Minor features (geoip):
- - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the April 8 2015 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.7.1-alpha - 2015-05-12
- Tor 0.2.7.1-alpha is the first alpha release in its series. It
- includes numerous small features and bugfixes against previous Tor
- versions, and numerous small infrastructure improvements. The most
- notable features are several new ways for controllers to interact with
- the hidden services subsystem.
- o New system requirements:
- - Tor no longer includes workarounds to support Libevent versions
- before 1.3e. Libevent 2.0 or later is recommended. Closes
- ticket 15248.
- o Major features (controller):
- - Add the ADD_ONION and DEL_ONION commands that allow the creation
- and management of hidden services via the controller. Closes
- ticket 6411.
- - New "GETINFO onions/current" and "GETINFO onions/detached"
- commands to get information about hidden services created via the
- controller. Part of ticket 6411.
- - New HSFETCH command to launch a request for a hidden service
- descriptor. Closes ticket 14847.
- - New HSPOST command to upload a hidden service descriptor. Closes
- ticket 3523. Patch by "DonnchaC".
- o Major bugfixes (hidden services):
- - Revert commit that made directory authorities assign the HSDir
- flag to relays without a DirPort; this was bad because such relays
- can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
- on 0.2.6.3-alpha.
- o Minor features (clock-jump tolerance):
- - Recover better when our clock jumps back many hours, like might
- happen for Tails or Whonix users who start with a very wrong
- hardware clock, use Tor to discover a more accurate time, and then
- fix their clock. Resolves part of ticket 8766.
- o Minor features (command-line interface):
- - Make --hash-password imply --hush to prevent unnecessary noise.
- Closes ticket 15542. Patch from "cypherpunks".
- - Print a warning whenever we find a relative file path being used
- as torrc option. Resolves issue 14018.
- o Minor features (controller):
- - Add DirAuthority lines for default directory authorities to the
- output of the "GETINFO config/defaults" command if not already
- present. Implements ticket 14840.
- - Controllers can now use "GETINFO hs/client/desc/id/..." to
- retrieve items from the client's hidden service descriptor cache.
- Closes ticket 14845.
- - Implement a new controller command "GETINFO status/fresh-relay-
- descs" to fetch a descriptor/extrainfo pair that was generated on
- demand just for the controller's use. Implements ticket 14784.
- o Minor features (DoS-resistance):
- - Make it harder for attackers to overload hidden services with
- introductions, by blocking multiple introduction requests on the
- same circuit. Resolves ticket 15515.
- o Minor features (geoip):
- - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the April 8 2015 Maxmind GeoLite2
- Country database.
- o Minor features (HS popularity countermeasure):
- - To avoid leaking HS popularity, don't cycle the introduction point
- when we've handled a fixed number of INTRODUCE2 cells but instead
- cycle it when a random number of introductions is reached, thus
- making it more difficult for an attacker to find out the amount of
- clients that have used the introduction point for a specific HS.
- Closes ticket 15745.
- o Minor features (logging):
- - Include the Tor version in all LD_BUG log messages, since people
- tend to cut and paste those into the bugtracker. Implements
- ticket 15026.
- o Minor features (pluggable transports):
- - When launching managed pluggable transports on Linux systems,
- attempt to have the kernel deliver a SIGTERM on tor exit if the
- pluggable transport process is still running. Resolves
- ticket 15471.
- - When launching managed pluggable transports, setup a valid open
- stdin in the child process that can be used to detect if tor has
- terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
- can be used by implementations to detect this new behavior.
- Resolves ticket 15435.
- o Minor features (testing):
- - Add a test to verify that the compiler does not eliminate our
- memwipe() implementation. Closes ticket 15377.
- - Add make rule `check-changes` to verify the format of changes
- files. Closes ticket 15180.
- - Add unit tests for control_event_is_interesting(). Add a compile-
- time check that the number of events doesn't exceed the capacity
- of control_event_t.event_mask. Closes ticket 15431, checks for
- bugs similar to 13085. Patch by "teor".
- - Command-line argument tests moved to Stem. Resolves ticket 14806.
- - Integrate the ntor, backtrace, and zero-length keys tests into the
- automake test suite. Closes ticket 15344.
- - Remove assertions during builds to determine Tor's test coverage.
- We don't want to trigger these even in assertions, so including
- them artificially makes our branch coverage look worse than it is.
- This patch provides the new test-stem-full and coverage-html-full
- configure options. Implements ticket 15400.
- o Minor bugfixes (build):
- - Improve out-of-tree builds by making non-standard rules work and
- clean up additional files and directories. Fixes bug 15053; bugfix
- on 0.2.7.0-alpha.
- o Minor bugfixes (command-line interface):
- - When "--quiet" is provided along with "--validate-config", do not
- write anything to stdout on success. Fixes bug 14994; bugfix
- on 0.2.3.3-alpha.
- - When complaining about bad arguments to "--dump-config", use
- stderr, not stdout.
- o Minor bugfixes (configuration, unit tests):
- - Only add the default fallback directories when the DirAuthorities,
- AlternateDirAuthority, and FallbackDir directory config options
- are set to their defaults. The default fallback directory list is
- currently empty, this fix will only change tor's behavior when it
- has default fallback directories. Includes unit tests for
- consider_adding_dir_servers(). Fixes bug 15642; bugfix on
- 90f6071d8dc0 in 0.2.4.7-alpha. Patch by "teor".
- o Minor bugfixes (correctness):
- - For correctness, avoid modifying a constant string in
- handle_control_postdescriptor. Fixes bug 15546; bugfix
- on 0.1.1.16-rc.
- - Remove side-effects from tor_assert() calls. This was harmless,
- because we never disable assertions, but it is bad style and
- unnecessary. Fixes bug 15211; bugfix on 0.2.5.5, 0.2.2.36,
- and 0.2.0.10.
- o Minor bugfixes (hidden service):
- - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
- a client authorized hidden service. Fixes bug 15823; bugfix
- on 0.2.1.6-alpha.
- - Remove an extraneous newline character from the end of hidden
- service descriptors. Fixes bug 15296; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (interface):
- - Print usage information for --dump-config when it is used without
- an argument. Also, fix the error message to use different wording
- and add newline at the end. Fixes bug 15541; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (logs):
- - When building Tor under Clang, do not include an extra set of
- parentheses in log messages that include function names. Fixes bug
- 15269; bugfix on every released version of Tor when compiled with
- recent enough Clang.
- o Minor bugfixes (network):
- - When attempting to use fallback technique for network interface
- lookup, disregard loopback and multicast addresses since they are
- unsuitable for public communications.
- o Minor bugfixes (statistics):
- - Disregard the ConnDirectionStatistics torrc options when Tor is
- not a relay since in that mode of operation no sensible data is
- being collected and because Tor might run into measurement hiccups
- when running as a client for some time, then becoming a relay.
- Fixes bug 15604; bugfix on 0.2.2.35.
- o Minor bugfixes (test networks):
- - When self-testing reachability, use ExtendAllowPrivateAddresses to
- determine if local/private addresses imply reachability. The
- previous fix used TestingTorNetwork, which implies
- ExtendAllowPrivateAddresses, but this excluded rare configurations
- where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
- not. Fixes bug 15771; bugfix on 0.2.6.1-alpha. Patch by "teor",
- issue discovered by CJ Ess.
- o Minor bugfixes (testing):
- - Check for matching value in server response in ntor_ref.py. Fixes
- bug 15591; bugfix on 0.2.4.8-alpha. Reported and fixed
- by "joelanders".
- - Set the severity correctly when testing
- get_interface_addresses_ifaddrs() and
- get_interface_addresses_win32(), so that the tests fail gracefully
- instead of triggering an assertion. Fixes bug 15759; bugfix on
- 0.2.6.3-alpha. Reported by Nicolas Derive.
- o Code simplification and refactoring:
- - Move the hacky fallback code out of get_interface_address6() into
- separate function and get it covered with unit-tests. Resolves
- ticket 14710.
- - Refactor hidden service client-side cache lookup to intelligently
- report its various failure cases, and disentangle failure cases
- involving a lack of introduction points. Closes ticket 14391.
- - Use our own Base64 encoder instead of OpenSSL's, to allow more
- control over the output. Part of ticket 15652.
- o Documentation:
- - Improve the descriptions of statistics-related torrc options in
- the manpage to describe rationale and possible uses cases. Fixes
- issue 15550.
- - Improve the layout and formatting of ./configure --help messages.
- Closes ticket 15024. Patch from "cypherpunks".
- - Standardize on the term "server descriptor" in the manual page.
- Previously, we had used "router descriptor", "server descriptor",
- and "relay descriptor" interchangeably. Part of ticket 14987.
- o Removed code:
- - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
- and always use the internal Base64 decoder. The internal decoder
- has been part of tor since 0.2.0.10-alpha, and no one should
- be using the OpenSSL one. Part of ticket 15652.
- - Remove the 'tor_strclear()' function; use memwipe() instead.
- Closes ticket 14922.
- o Removed features:
- - Remove the (seldom-used) DynamicDHGroups feature. For anti-
- fingerprinting we now recommend pluggable transports; for forward-
- secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
- - Remove the undocumented "--digests" command-line option. It
- complicated our build process, caused subtle build issues on
- multiple platforms, and is now redundant since we started
- including git version identifiers. Closes ticket 14742.
- - Tor no longer contains checks for ancient directory cache versions
- that didn't know about microdescriptors.
- - Tor no longer contains workarounds for stat files generated by
- super-old versions of Tor that didn't choose guards sensibly.
- Changes in version 0.2.4.27 - 2015-04-06
- Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
- could be used by an attacker to crash hidden services, or crash clients
- visiting hidden services. Hidden services should upgrade as soon as
- possible; clients should upgrade whenever packages become available.
- This release also backports a simple improvement to make hidden
- services a bit less vulnerable to denial-of-service attacks.
- o Major bugfixes (security, hidden service):
- - Fix an issue that would allow a malicious client to trigger an
- assertion failure and halt a hidden service. Fixes bug 15600;
- bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- - Fix a bug that could cause a client to crash with an assertion
- failure when parsing a malformed hidden service descriptor. Fixes
- bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
- o Minor features (DoS-resistance, hidden service):
- - Introduction points no longer allow multiple INTRODUCE1 cells to
- arrive on the same circuit. This should make it more expensive for
- attackers to overwhelm hidden services with introductions.
- Resolves ticket 15515.
- Changes in version 0.2.5.12 - 2015-04-06
- Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
- could be used by an attacker to crash hidden services, or crash clients
- visiting hidden services. Hidden services should upgrade as soon as
- possible; clients should upgrade whenever packages become available.
- This release also backports a simple improvement to make hidden
- services a bit less vulnerable to denial-of-service attacks.
- o Major bugfixes (security, hidden service):
- - Fix an issue that would allow a malicious client to trigger an
- assertion failure and halt a hidden service. Fixes bug 15600;
- bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- - Fix a bug that could cause a client to crash with an assertion
- failure when parsing a malformed hidden service descriptor. Fixes
- bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
- o Minor features (DoS-resistance, hidden service):
- - Introduction points no longer allow multiple INTRODUCE1 cells to
- arrive on the same circuit. This should make it more expensive for
- attackers to overwhelm hidden services with introductions.
- Resolves ticket 15515.
- Changes in version 0.2.6.7 - 2015-04-06
- Tor 0.2.6.7 fixes two security issues that could be used by an
- attacker to crash hidden services, or crash clients visiting hidden
- services. Hidden services should upgrade as soon as possible; clients
- should upgrade whenever packages become available.
- This release also contains two simple improvements to make hidden
- services a bit less vulnerable to denial-of-service attacks.
- o Major bugfixes (security, hidden service):
- - Fix an issue that would allow a malicious client to trigger an
- assertion failure and halt a hidden service. Fixes bug 15600;
- bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- - Fix a bug that could cause a client to crash with an assertion
- failure when parsing a malformed hidden service descriptor. Fixes
- bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
- o Minor features (DoS-resistance, hidden service):
- - Introduction points no longer allow multiple INTRODUCE1 cells to
- arrive on the same circuit. This should make it more expensive for
- attackers to overwhelm hidden services with introductions.
- Resolves ticket 15515.
- - Decrease the amount of reattempts that a hidden service performs
- when its rendezvous circuits fail. This reduces the computational
- cost for running a hidden service under heavy load. Resolves
- ticket 11447.
- Changes in version 0.2.6.6 - 2015-03-24
- Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
- It adds numerous safety, security, correctness, and performance
- improvements. Client programs can be configured to use more kinds of
- sockets, AutomapHosts works better, the multithreading backend is
- improved, cell transmission is refactored, test coverage is much
- higher, more denial-of-service attacks are handled, guard selection is
- improved to handle long-term guards better, pluggable transports
- should work a bit better, and some annoying hidden service performance
- bugs should be addressed.
- o Minor bugfixes (portability):
- - Use the correct datatype in the SipHash-2-4 function to prevent
- compilers from assuming any sort of alignment. Fixes bug 15436;
- bugfix on 0.2.5.3-alpha.
- Changes in version 0.2.6.5-rc - 2015-03-18
- Tor 0.2.6.5-rc is the second and (hopefully) last release candidate in
- the 0.2.6. It fixes a small number of bugs found in 0.2.6.4-rc.
- o Major bugfixes (client):
- - Avoid crashing when making certain configuration option changes on
- clients. Fixes bug 15245; bugfix on 0.2.6.3-alpha. Reported
- by "anonym".
- o Major bugfixes (pluggable transports):
- - Initialize the extended OR Port authentication cookie before
- launching pluggable transports. This prevents a race condition
- that occurred when server-side pluggable transports would cache the
- authentication cookie before it has been (re)generated. Fixes bug
- 15240; bugfix on 0.2.5.1-alpha.
- o Major bugfixes (portability):
- - Do not crash on startup when running on Solaris. Fixes a bug
- related to our fix for 9495; bugfix on 0.2.6.1-alpha. Reported
- by "ruebezahl".
- o Minor features (heartbeat):
- - On relays, report how many connections we negotiated using each
- version of the Tor link protocols. This information will let us
- know if removing support for very old versions of the Tor
- protocols is harming the network. Closes ticket 15212.
- o Code simplification and refactoring:
- - Refactor main loop to extract the 'loop' part. This makes it
- easier to run Tor under Shadow. Closes ticket 15176.
- Changes in version 0.2.5.11 - 2015-03-17
- Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
- It backports several bugfixes from the 0.2.6 branch, including a
- couple of medium-level security fixes for relays and exit nodes.
- It also updates the list of directory authorities.
- o Directory authority changes:
- - Remove turtles as a directory authority.
- - Add longclaw as a new (v3) directory authority. This implements
- ticket 13296. This keeps the directory authority count at 9.
- - The directory authority Faravahar has a new IP address. This
- closes ticket 14487.
- o Major bugfixes (crash, OSX, security):
- - Fix a remote denial-of-service opportunity caused by a bug in
- OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
- in OSX 10.9.
- o Major bugfixes (relay, stability, possible security):
- - Fix a bug that could lead to a relay crashing with an assertion
- failure if a buffer of exactly the wrong layout was passed to
- buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
- 0.2.0.10-alpha. Patch from 'cypherpunks'.
- - Do not assert if the 'data' pointer on a buffer is advanced to the
- very end of the buffer; log a BUG message instead. Only assert if
- it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
- o Major bugfixes (exit node stability):
- - Fix an assertion failure that could occur under high DNS load.
- Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
- diagnosed and fixed by "cypherpunks".
- o Major bugfixes (Linux seccomp2 sandbox):
- - Upon receiving sighup with the seccomp2 sandbox enabled, do not
- crash during attempts to call wait4. Fixes bug 15088; bugfix on
- 0.2.5.1-alpha. Patch from "sanic".
- o Minor features (controller):
- - New "GETINFO bw-event-cache" to get information about recent
- bandwidth events. Closes ticket 14128. Useful for controllers to
- get recent bandwidth history after the fix for ticket 13988.
- o Minor features (geoip):
- - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the March 3 2015 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (client, automapping):
- - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
- no value follows the option. Fixes bug 14142; bugfix on
- 0.2.4.7-alpha. Patch by "teor".
- - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
- 14195; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (compilation):
- - Build without warnings with the stock OpenSSL srtp.h header, which
- has a duplicate declaration of SSL_get_selected_srtp_profile().
- Fixes bug 14220; this is OpenSSL's bug, not ours.
- o Minor bugfixes (directory authority):
- - Allow directory authorities to fetch more data from one another if
- they find themselves missing lots of votes. Previously, they had
- been bumping against the 10 MB queued data limit. Fixes bug 14261;
- bugfix on 0.1.2.5-alpha.
- - Enlarge the buffer to read bwauth generated files to avoid an
- issue when parsing the file in dirserv_read_measured_bandwidths().
- Fixes bug 14125; bugfix on 0.2.2.1-alpha.
- o Minor bugfixes (statistics):
- - Increase period over which bandwidth observations are aggregated
- from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
- o Minor bugfixes (preventative security, C safety):
- - When reading a hexadecimal, base-32, or base-64 encoded value from
- a string, always overwrite the whole output buffer. This prevents
- some bugs where we would look at (but fortunately, not reveal)
- uninitialized memory on the stack. Fixes bug 14013; bugfix on all
- versions of Tor.
- Changes in version 0.2.4.26 - 2015-03-17
- Tor 0.2.4.26 includes an updated list of directory authorities. It
- also backports a couple of stability and security bugfixes from 0.2.5
- and beyond.
- o Directory authority changes:
- - Remove turtles as a directory authority.
- - Add longclaw as a new (v3) directory authority. This implements
- ticket 13296. This keeps the directory authority count at 9.
- - The directory authority Faravahar has a new IP address. This
- closes ticket 14487.
- o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
- - Fix an assertion failure that could occur under high DNS load.
- Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
- diagnosed and fixed by "cypherpunks".
- o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
- - Fix a bug that could lead to a relay crashing with an assertion
- failure if a buffer of exactly the wrong layout was passed to
- buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
- 0.2.0.10-alpha. Patch from 'cypherpunks'.
- - Do not assert if the 'data' pointer on a buffer is advanced to the
- very end of the buffer; log a BUG message instead. Only assert if
- it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
- o Minor features (geoip):
- - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the March 3 2015 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.6.4-rc - 2015-03-09
- Tor 0.2.6.4-alpha fixes an issue in the directory code that an
- attacker might be able to use in order to crash certain Tor
- directories. It also resolves some minor issues left over from, or
- introduced in, Tor 0.2.6.3-alpha or earlier.
- o Major bugfixes (crash, OSX, security):
- - Fix a remote denial-of-service opportunity caused by a bug in
- OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
- in OSX 10.9.
- o Major bugfixes (relay, stability, possible security):
- - Fix a bug that could lead to a relay crashing with an assertion
- failure if a buffer of exactly the wrong layout is passed to
- buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
- 0.2.0.10-alpha. Patch from "cypherpunks".
- - Do not assert if the 'data' pointer on a buffer is advanced to the
- very end of the buffer; log a BUG message instead. Only assert if
- it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
- o Major bugfixes (FreeBSD IPFW transparent proxy):
- - Fix address detection with FreeBSD transparent proxies, when
- "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
- on 0.2.5.4-alpha.
- o Major bugfixes (Linux seccomp2 sandbox):
- - Pass IPPROTO_TCP rather than 0 to socket(), so that the Linux
- seccomp2 sandbox doesn't fail. Fixes bug 14989; bugfix
- on 0.2.6.3-alpha.
- - Allow AF_UNIX hidden services to be used with the seccomp2
- sandbox. Fixes bug 15003; bugfix on 0.2.6.3-alpha.
- - Upon receiving sighup with the seccomp2 sandbox enabled, do not
- crash during attempts to call wait4. Fixes bug 15088; bugfix on
- 0.2.5.1-alpha. Patch from "sanic".
- o Minor features (controller):
- - Messages about problems in the bootstrap process now include
- information about the server we were trying to connect to when we
- noticed the problem. Closes ticket 15006.
- o Minor features (geoip):
- - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the March 3 2015 Maxmind GeoLite2
- Country database.
- o Minor features (logs):
- - Quiet some log messages in the heartbeat and at startup. Closes
- ticket 14950.
- o Minor bugfixes (certificate handling):
- - If an authority operator accidentally makes a signing certificate
- with a future publication time, do not discard its real signing
- certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
- - Remove any old authority certificates that have been superseded
- for at least two days. Previously, we would keep superseded
- certificates until they expired, if they were published close in
- time to the certificate that superseded them. Fixes bug 11454;
- bugfix on 0.2.1.8-alpha.
- o Minor bugfixes (compilation):
- - Fix a compilation warning on s390. Fixes bug 14988; bugfix
- on 0.2.5.2-alpha.
- - Fix a compilation warning on FreeBSD. Fixes bug 15151; bugfix
- on 0.2.6.2-alpha.
- o Minor bugfixes (testing):
- - Fix endianness issues in unit test for resolve_my_address() to
- have it pass on big endian systems. Fixes bug 14980; bugfix on
- Tor 0.2.6.3-alpha.
- - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
- 15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
- - When running the new 'make test-stem' target, use the configured
- python binary. Fixes bug 15037; bugfix on 0.2.6.3-alpha. Patch
- from "cypherpunks".
- - When running the zero-length-keys tests, do not use the default
- torrc file. Fixes bug 15033; bugfix on 0.2.6.3-alpha. Reported
- by "reezer".
- o Directory authority IP change:
- - The directory authority Faravahar has a new IP address. This
- closes ticket 14487.
- o Removed code:
- - Remove some lingering dead code that once supported mempools.
- Mempools were disabled by default in 0.2.5, and removed entirely
- in 0.2.6.3-alpha. Closes more of ticket 14848; patch
- by "cypherpunks".
- Changes in version 0.2.6.3-alpha - 2015-02-19
- Tor 0.2.6.3-alpha is the third (and hopefully final) alpha release in
- the 0.2.6.x series. It introduces support for more kinds of sockets,
- makes it harder to accidentally run an exit, improves our
- multithreading backend, incorporates several fixes for the
- AutomapHostsOnResolve option, and fixes numerous other bugs besides.
- If no major regressions or security holes are found in this version,
- the next version will be a release candidate.
- o Deprecated versions:
- - Tor relays older than 0.2.4.18-rc are no longer allowed to
- advertise themselves on the network. Closes ticket 13555.
- o Major features (security, unix domain sockets):
- - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
- applications can reach Tor without having to create AF_INET or
- AF_INET6 sockets, meaning they can completely disable their
- ability to make non-Tor network connections. To create a socket of
- this type, use "SocksPort unix:/path/to/socket". Implements
- ticket 12585.
- - Support mapping hidden service virtual ports to AF_UNIX sockets.
- The syntax is "HiddenServicePort 80 unix:/path/to/socket".
- Implements ticket 11485.
- o Major features (changed defaults):
- - Prevent relay operators from unintentionally running exits: When a
- relay is configured as an exit node, we now warn the user unless
- the "ExitRelay" option is set to 1. We warn even more loudly if
- the relay is configured with the default exit policy, since this
- can indicate accidental misconfiguration. Setting "ExitRelay 0"
- stops Tor from running as an exit relay. Closes ticket 10067.
- o Major features (directory system):
- - When downloading server- or microdescriptors from a directory
- server, we no longer launch multiple simultaneous requests to the
- same server. This reduces load on the directory servers,
- especially when directory guards are in use. Closes ticket 9969.
- - When downloading server- or microdescriptors over a tunneled
- connection, do not limit the length of our requests to what the
- Squid proxy is willing to handle. Part of ticket 9969.
- - Authorities can now vote on the correct digests and latest
- versions for different software packages. This allows packages
- that include Tor to use the Tor authority system as a way to get
- notified of updates and their correct digests. Implements proposal
- 227. Closes ticket 10395.
- o Major features (guards):
- - Introduce the Guardfraction feature to improves load balancing on
- guard nodes. Specifically, it aims to reduce the traffic gap that
- guard nodes experience when they first get the Guard flag. This is
- a required step if we want to increase the guard lifetime to 9
- months or greater. Closes ticket 9321.
- o Major features (performance):
- - Make the CPU worker implementation more efficient by avoiding the
- kernel and lengthening pipelines. The original implementation used
- sockets to transfer data from the main thread to the workers, and
- didn't allow any thread to be assigned more than a single piece of
- work at once. The new implementation avoids communications
- overhead by making requests in shared memory, avoiding kernel IO
- where possible, and keeping more requests in flight at once.
- Implements ticket 9682.
- o Major features (relay):
- - Raise the minimum acceptable configured bandwidth rate for bridges
- to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
- 20 KiB/sec.) Closes ticket 13822.
- o Major bugfixes (exit node stability):
- - Fix an assertion failure that could occur under high DNS load.
- Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
- diagnosed and fixed by "cypherpunks".
- o Major bugfixes (mixed relay-client operation):
- - When running as a relay and client at the same time (not
- recommended), if we decide not to use a new guard because we want
- to retry older guards, only close the locally-originating circuits
- passing through that guard. Previously we would close all the
- circuits through that guard. Fixes bug 9819; bugfix on
- 0.2.1.1-alpha. Reported by "skruffy".
- o Minor features (build):
- - New --disable-system-torrc compile-time option to prevent Tor from
- looking for the system-wide torrc or torrc-defaults files.
- Resolves ticket 13037.
- o Minor features (controller):
- - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
- events so controllers can observe circuit isolation inputs. Closes
- ticket 8405.
- - ControlPort now supports the unix:/path/to/socket syntax as an
- alternative to the ControlSocket option, for consistency with
- SocksPort and HiddenServicePort. Closes ticket 14451.
- - New "GETINFO bw-event-cache" to get information about recent
- bandwidth events. Closes ticket 14128. Useful for controllers to
- get recent bandwidth history after the fix for ticket 13988.
- o Minor features (Denial of service resistance):
- - Count the total number of bytes used storing hidden service
- descriptors against the value of MaxMemInQueues. If we're low on
- memory, and more than 20% of our memory is used holding hidden
- service descriptors, free them until no more than 10% of our
- memory holds hidden service descriptors. Free the least recently
- fetched descriptors first. Resolves ticket 13806.
- - When we have recently been under memory pressure (over 3/4 of
- MaxMemInQueues is allocated), then allocate smaller zlib objects
- for small requests. Closes ticket 11791.
- o Minor features (geoip):
- - Update geoip and geoip6 files to the January 7 2015 Maxmind
- GeoLite2 Country database.
- o Minor features (guard nodes):
- - Reduce the time delay before saving guard status to disk from 10
- minutes to 30 seconds (or from one hour to 10 minutes if
- AvoidDiskWrites is set). Closes ticket 12485.
- o Minor features (hidden service):
- - Make Sybil attacks against hidden services harder by changing the
- minimum time required to get the HSDir flag from 25 hours up to 96
- hours. Addresses ticket 14149.
- - New option "HiddenServiceAllowUnknownPorts" to allow hidden
- services to disable the anti-scanning feature introduced in
- 0.2.6.2-alpha. With this option not set, a connection to an
- unlisted port closes the circuit. With this option set, only a
- RELAY_DONE cell is sent. Closes ticket 14084.
- o Minor features (interface):
- - Implement "-f -" command-line option to read torrc configuration
- from standard input, if you don't want to store the torrc file in
- the file system. Implements feature 13865.
- o Minor features (logging):
- - Add a count of unique clients to the bridge heartbeat message.
- Resolves ticket 6852.
- - Suppress "router info incompatible with extra info" message when
- reading extrainfo documents from cache. (This message got loud
- around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
- ticket 13762.
- - Elevate hidden service authorized-client message from DEBUG to
- INFO. Closes ticket 14015.
- o Minor features (stability):
- - Add assertions in our hash-table iteration code to check for
- corrupted values that could cause infinite loops. Closes
- ticket 11737.
- o Minor features (systemd):
- - Various improvements and modernizations in systemd hardening
- support. Closes ticket 13805. Patch from Craig Andrews.
- o Minor features (testing networks):
- - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
- and the default on a testing network to 2 minutes. Drop the
- MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
- keep the default on a testing network at 30 seconds. This reduces
- HS bootstrap time to around 25 seconds. Also, change the default
- time in test-network.sh to match. Closes ticket 13401. Patch
- by "teor".
- - Create TestingDirAuthVoteHSDir to correspond to
- TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
- HSDir flag for the listed relays regardless of uptime or ORPort
- connectivity. Respects the value of VoteOnHidServDirectoriesV2.
- Partial implementation for ticket 14067. Patch by "teor".
- o Minor features (tor2web mode):
- - Introduce the config option Tor2webRendezvousPoints, which allows
- clients in Tor2webMode to select a specific Rendezvous Point to be
- used in HS circuits. This might allow better performance for
- Tor2Web nodes. Implements ticket 12844.
- o Minor bugfixes (client DNS):
- - Report the correct cached DNS expiration times on SOCKS port or in
- DNS replies. Previously, we would report everything as "never
- expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
- - Avoid a small memory leak when we find a cached answer for a
- reverse DNS lookup in a client-side DNS cache. (Remember, client-
- side DNS caching is off by default, and is not recommended.) Fixes
- bug 14259; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (client, automapping):
- - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
- no value follows the option. Fixes bug 14142; bugfix on
- 0.2.4.7-alpha. Patch by "teor".
- - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
- 14195; bugfix on 0.1.0.1-rc.
- - Prevent changes to other options from removing the wildcard value
- "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
- on 0.2.0.1-alpha.
- - Allow MapAddress and AutomapHostsOnResolve to work together when
- an address is mapped into another address type (like .onion) that
- must be automapped at resolve time. Fixes bug 7555; bugfix
- on 0.2.0.1-alpha.
- o Minor bugfixes (client, bridges):
- - When we are using bridges and we had a network connectivity
- problem, only retry connecting to our currently configured
- bridges, not all bridges we know about and remember using. Fixes
- bug 14216; bugfix on 0.2.2.17-alpha.
- o Minor bugfixes (client, IPv6):
- - Reject socks requests to literal IPv6 addresses when IPv6Traffic
- flag is not set; and not because the NoIPv4Traffic flag was set.
- Previously we'd looked at the NoIPv4Traffic flag for both types of
- literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (compilation):
- - The address of an array in the middle of a structure will always
- be non-NULL. clang recognises this and complains. Disable the
- tautologous and redundant check to silence this warning. Fixes bug
- 14001; bugfix on 0.2.1.2-alpha.
- - Avoid warnings when building with systemd 209 or later. Fixes bug
- 14072; bugfix on 0.2.6.2-alpha. Patch from "h.venev".
- - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
- Addresses ticket 14188.
- - Build without warnings with the stock OpenSSL srtp.h header, which
- has a duplicate declaration of SSL_get_selected_srtp_profile().
- Fixes bug 14220; this is OpenSSL's bug, not ours.
- - Do not compile any code related to Tor2Web mode when Tor2Web mode
- is not enabled at compile time. Previously, this code was included
- in a disabled state. See discussion on ticket 12844.
- - Remove the --disable-threads configure option again. It was
- accidentally partially reintroduced in 29ac883606d6d. Fixes bug
- 14819; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (controller):
- - Report "down" in response to the "GETINFO entry-guards" command
- when relays are down with an unreachable_since value. Previously,
- we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
- - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
- 14116; bugfix on 0.2.2.9-alpha.
- - Add a code for the END_CIRC_REASON_IP_NOW_REDUNDANT circuit close
- reason. Fixes bug 14207; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (directory authority):
- - Allow directory authorities to fetch more data from one another if
- they find themselves missing lots of votes. Previously, they had
- been bumping against the 10 MB queued data limit. Fixes bug 14261;
- bugfix on 0.1.2.5-alpha.
- - Do not attempt to download extrainfo documents which we will be
- unable to validate with a matching server descriptor. Fixes bug
- 13762; bugfix on 0.2.0.1-alpha.
- - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
- control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
- - Enlarge the buffer to read bwauth generated files to avoid an
- issue when parsing the file in dirserv_read_measured_bandwidths().
- Fixes bug 14125; bugfix on 0.2.2.1-alpha.
- o Minor bugfixes (file handling):
- - Stop failing when key files are zero-length. Instead, generate new
- keys, and overwrite the empty key files. Fixes bug 13111; bugfix
- on all versions of Tor. Patch by "teor".
- - Stop generating a fresh .old RSA onion key file when the .old file
- is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
- - Avoid overwriting .old key files with empty key files.
- - Skip loading zero-length extrainfo store, router store, stats,
- state, and key files.
- - Avoid crashing when trying to reload a torrc specified as a
- relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
- on 0.2.3.11-alpha.
- o Minor bugfixes (hidden services):
- - Close the introduction circuit when we have no more usable intro
- points, instead of waiting for it to time out. This also ensures
- that no follow-up HS descriptor fetch is triggered when the
- circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
- - When fetching a hidden service descriptor for a down service that
- was recently up, do not keep refetching until we try the same
- replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
- - Successfully launch Tor with a nonexistent hidden service
- directory. Our fix for bug 13942 didn't catch this case. Fixes bug
- 14106; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (logging):
- - Avoid crashing when there are more log domains than entries in
- domain_list. Bugfix on 0.2.3.1-alpha.
- - Add a string representation for LD_SCHED. Fixes bug 14740; bugfix
- on 0.2.6.1-alpha.
- - Don't log messages to stdout twice when starting up. Fixes bug
- 13993; bugfix on 0.2.6.1-alpha.
- o Minor bugfixes (parsing):
- - Stop accepting milliseconds (or other junk) at the end of
- descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
- - Support two-number and three-number version numbers correctly, in
- case we change the Tor versioning system in the future. Fixes bug
- 13661; bugfix on 0.0.8pre1.
- o Minor bugfixes (path counting):
- - When deciding whether the consensus lists any exit nodes, count
- the number listed in the consensus, not the number we have
- descriptors for. Fixes part of bug 14918; bugfix on 0.2.6.2-alpha.
- - When deciding whether we have any exit nodes, only examine
- ExitNodes when the ExitNodes option is actually set. Fixes part of
- bug 14918; bugfix on 0.2.6.2-alpha.
- - Get rid of redundant and possibly scary warnings that we are
- missing directory information while we bootstrap. Fixes part of
- bug 14918; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (portability):
- - Fix the ioctl()-based network interface lookup code so that it
- will work on systems that have variable-length struct ifreq, for
- example Mac OS X.
- - Fix scheduler compilation on targets where char is unsigned. Fixes
- bug 14764; bugfix on 0.2.6.2-alpha. Reported by Christian Kujau.
- o Minor bugfixes (sandbox):
- - Allow glibc fatal errors to be sent to stderr before Tor exits.
- Previously, glibc would try to write them to /dev/tty, and the
- sandbox would trap the call and make Tor exit prematurely. Fixes
- bug 14759; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (shutdown):
- - When shutting down, always call event_del() on lingering read or
- write events before freeing them. Otherwise, we risk double-frees
- or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
- on 0.1.0.2-rc.
- o Minor bugfixes (small memory leaks):
- - Avoid leaking memory when using IPv6 virtual address mappings.
- Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
- der Woerdt.
- o Minor bugfixes (statistics):
- - Increase period over which bandwidth observations are aggregated
- from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
- o Minor bugfixes (systemd support):
- - Fix detection and operation of systemd watchdog. Fixes part of bug
- 14141; bugfix on 0.2.6.2-alpha. Patch from Tomasz Torcz.
- - Run correctly under systemd with the RunAsDaemon option set. Fixes
- part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
- - Inform the systemd supervisor about more changes in the Tor
- process status. Implements part of ticket 14141. Patch from
- Tomasz Torcz.
- - Cause the "--disable-systemd" option to actually disable systemd
- support. Fixes bug 14350; bugfix on 0.2.6.2-alpha. Patch
- from "blueness".
- o Minor bugfixes (TLS):
- - Check more thoroughly throughout the TLS code for possible
- unlogged TLS errors. Possible diagnostic or fix for bug 13319.
- o Minor bugfixes (transparent proxy):
- - Use getsockname, not getsockopt, to retrieve the address for a
- TPROXY-redirected connection. Fixes bug 13796; bugfix
- on 0.2.5.2-alpha.
- o Code simplification and refactoring:
- - Move fields related to isolating and configuring client ports into
- a shared structure. Previously, they were duplicated across
- port_cfg_t, listener_connection_t, and edge_connection_t. Failure
- to copy them correctly had been the cause of at least one bug in
- the past. Closes ticket 8546.
- - Refactor the get_interface_addresses_raw() doom-function into
- multiple smaller and simpler subfunctions. Cover the resulting
- subfunctions with unit-tests. Fixes a significant portion of
- issue 12376.
- - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
- only for version <= 0.2.2.24 which is now deprecated. Closes
- ticket 14202.
- - Remove a test for a long-defunct broken version-one
- directory server.
- o Documentation:
- - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
- for writing the OpenBSD-specific tips. Resolves ticket 13702.
- - Make the tor-resolve documentation match its help string and its
- options. Resolves part of ticket 14325.
- - Log a more useful error message from tor-resolve when failing to
- look up a hidden service address. Resolves part of ticket 14325.
- o Downgraded warnings:
- - Don't warn when we've attempted to contact a relay using the wrong
- ntor onion key. Closes ticket 9635.
- o Removed features:
- - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
- longer silently accepted as an alias for "ExitNodes".
- - The --enable-mempool and --enable-buf-freelists options, which
- were originally created to work around bad malloc implementations,
- no longer exist. They were off-by-default in 0.2.5. Closes
- ticket 14848.
- o Testing:
- - Make the checkdir/perms test complete successfully even if the
- global umask is not 022. Fixes bug 14215; bugfix on 0.2.6.2-alpha.
- - Test that tor does not fail when key files are zero-length. Check
- that tor generates new keys, and overwrites the empty key files.
- - Test that tor generates new keys when keys are missing
- (existing behavior).
- - Test that tor does not overwrite key files that already contain
- data (existing behavior). Tests bug 13111. Patch by "teor".
- - New "make test-stem" target to run stem integration tests.
- Requires that the "STEM_SOURCE_DIR" environment variable be set.
- Closes ticket 14107.
- - Make the test_cmdline_args.py script work correctly on Windows.
- Patch from Gisle Vanem.
- - Move the slower unit tests into a new "./src/test/test-slow"
- binary that can be run independently of the other tests. Closes
- ticket 13243.
- - Avoid undefined behavior when sampling huge values from the
- Laplace distribution. This made unittests fail on Raspberry Pi.
- Bug found by Device. Fixes bug 14090; bugfix on 0.2.6.2-alpha.
- Changes in version 0.2.6.2-alpha - 2014-12-31
- Tor 0.2.6.2-alpha is the second alpha release in the 0.2.6.x series.
- It introduces a major new backend for deciding when to send cells on
- channels, which should lead down the road to big performance
- increases. It contains security and statistics features for better
- work on hidden services, and numerous bugfixes.
- This release contains many new unit tests, along with major
- performance improvements for running testing networks using Chutney.
- Thanks to a series of patches contributed by "teor", testing networks
- should now bootstrap in seconds, rather than minutes.
- o Major features (relay, infrastructure):
- - Complete revision of the code that relays use to decide which cell
- to send next. Formerly, we selected the best circuit to write on
- each channel, but we didn't select among channels in any
- sophisticated way. Now, we choose the best circuits globally from
- among those whose channels are ready to deliver traffic.
- This patch implements a new inter-cmux comparison API, a global
- high/low watermark mechanism and a global scheduler loop for
- transmission prioritization across all channels as well as among
- circuits on one channel. This schedule is currently tuned to
- (tolerantly) avoid making changes in network performance, but it
- should form the basis for major circuit performance increases in
- the future. Code by Andrea; tuning by Rob Jansen; implements
- ticket 9262.
- o Major features (hidden services):
- - Make HS port scanning more difficult by immediately closing the
- circuit when a user attempts to connect to a nonexistent port.
- Closes ticket 13667.
- - Add a HiddenServiceStatistics option that allows Tor relays to
- gather and publish statistics about the overall size and volume of
- hidden service usage. Specifically, when this option is turned on,
- an HSDir will publish an approximate number of hidden services
- that have published descriptors to it the past 24 hours. Also, if
- a relay has acted as a hidden service rendezvous point, it will
- publish the approximate amount of rendezvous cells it has relayed
- the past 24 hours. The statistics themselves are obfuscated so
- that the exact values cannot be derived. For more details see
- proposal 238, "Better hidden service stats from Tor relays". This
- feature is currently disabled by default. Implements feature 13192.
- o Major bugfixes (client, automap):
- - Repair automapping with IPv6 addresses. This automapping should
- have worked previously, but one piece of debugging code that we
- inserted to detect a regression actually caused the regression to
- manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
- 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
- Izquierdo Riera.
- o Major bugfixes (hidden services):
- - When closing an introduction circuit that was opened in parallel
- with others, don't mark the introduction point as unreachable.
- Previously, the first successful connection to an introduction
- point would make the other introduction points get marked as
- having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
- o Directory authority changes:
- - Remove turtles as a directory authority.
- - Add longclaw as a new (v3) directory authority. This implements
- ticket 13296. This keeps the directory authority count at 9.
- o Major removed features:
- - Tor clients no longer support connecting to hidden services
- running on Tor 0.2.2.x and earlier; the Support022HiddenServices
- option has been removed. (There shouldn't be any hidden services
- running these versions on the network.) Closes ticket 7803.
- o Minor features (client):
- - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
- is enabled, reject requests with IP addresses as hostnames.
- Resolves ticket 13315.
- o Minor features (controller):
- - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
- write an unscheduled heartbeat message to the log. Implements
- feature 9503.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 15 2014 Maxmind GeoLite2
- Country database.
- o Minor features (hidden services):
- - When re-enabling the network, don't try to build introduction
- circuits until we have successfully built a circuit. This makes
- hidden services come up faster when the network is re-enabled.
- Patch from "akwizgran". Closes ticket 13447.
- - When we fail to retrieve a hidden service descriptor, send the
- controller an "HS_DESC FAILED" controller event. Implements
- feature 13212.
- - New HiddenServiceDirGroupReadable option to cause hidden service
- directories and hostname files to be created group-readable. Patch
- from "anon", David Stainton, and "meejah". Closes ticket 11291.
- o Minor features (systemd):
- - Where supported, when running with systemd, report successful
- startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
- - When running with systemd, support systemd watchdog messages. Part
- of ticket 11016. Patch by Michael Scherer.
- o Minor features (transparent proxy):
- - Update the transparent proxy option checks to allow for both ipfw
- and pf on OS X. Closes ticket 14002.
- - Use the correct option when using IPv6 with transparent proxy
- support on Linux. Resolves 13808. Patch by Francisco Blas
- Izquierdo Riera.
- o Minor bugfixes (preventative security, C safety):
- - When reading a hexadecimal, base-32, or base-64 encoded value from
- a string, always overwrite the whole output buffer. This prevents
- some bugs where we would look at (but fortunately, not reveal)
- uninitialized memory on the stack. Fixes bug 14013; bugfix on all
- versions of Tor.
- - Clear all memory targeted by tor_addr_{to,from}_sockaddr(), not
- just the part that's used. This makes it harder for data leak bugs
- to occur in the event of other programming failures. Resolves
- ticket 14041.
- o Minor bugfixes (client, microdescriptors):
- - Use a full 256 bits of the SHA256 digest of a microdescriptor when
- computing which microdescriptors to download. This keeps us from
- erroneous download behavior if two microdescriptor digests ever
- have the same first 160 bits. Fixes part of bug 13399; bugfix
- on 0.2.3.1-alpha.
- - Reset a router's status if its microdescriptor digest changes,
- even if the first 160 bits remain the same. Fixes part of bug
- 13399; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (compilation):
- - Silence clang warnings under --enable-expensive-hardening,
- including implicit truncation of 64 bit values to 32 bit, const
- char assignment to self, tautological compare, and additional
- parentheses around equality tests. Fixes bug 13577; bugfix
- on 0.2.5.4-alpha.
- - Fix a clang warning about checking whether an address in the
- middle of a structure is NULL. Fixes bug 14001; bugfix
- on 0.2.1.2-alpha.
- o Minor bugfixes (hidden services):
- - Correctly send a controller event when we find that a rendezvous
- circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
- - Pre-check directory permissions for new hidden-services to avoid
- at least one case of "Bug: Acting on config options left us in a
- broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
- - When adding a new hidden service (for example, via SETCONF), Tor
- no longer congratulates the user for running a relay. Fixes bug
- 13941; bugfix on 0.2.6.1-alpha.
- - When fetching hidden service descriptors, we now check not only
- for whether we got the hidden service we had in mind, but also
- whether we got the particular descriptors we wanted. This prevents
- a class of inefficient but annoying DoS attacks by hidden service
- directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
- by "special".
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Make transparent proxy support work along with the seccomp2
- sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
- by Francisco Blas Izquierdo Riera.
- - Fix a memory leak in tor-resolve when running with the sandbox
- enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
- o Minor bugfixes (logging):
- - Downgrade warnings about RSA signature failures to info log level.
- Emit a warning when an extra info document is found incompatible
- with a corresponding router descriptor. Fixes bug 9812; bugfix
- on 0.0.6rc3.
- - Make connection_ap_handshake_attach_circuit() log the circuit ID
- correctly. Fixes bug 13701; bugfix on 0.0.6.
- o Minor bugfixes (misc):
- - Stop allowing invalid address patterns like "*/24" that contain
- both a wildcard address and a bit prefix length. This affects all
- our address-range parsing code. Fixes bug 7484; bugfix
- on 0.0.2pre14.
- o Minor bugfixes (testing networks, fast startup):
- - Allow Tor to build circuits using a consensus with no exits. If
- the consensus has no exits (typical of a bootstrapping test
- network), allow Tor to build circuits once enough descriptors have
- been downloaded. This assists in bootstrapping a testing Tor
- network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
- by "teor".
- - When V3AuthVotingInterval is low, give a lower If-Modified-Since
- header to directory servers. This allows us to obtain consensuses
- promptly when the consensus interval is very short. This assists
- in bootstrapping a testing Tor network. Fixes parts of bugs 13718
- and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
- - Stop assuming that private addresses are local when checking
- reachability in a TestingTorNetwork. Instead, when testing, assume
- all OR connections are remote. (This is necessary due to many test
- scenarios running all relays on localhost.) This assists in
- bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
- 0.1.0.1-rc. Patch by "teor".
- - Avoid building exit circuits from a consensus with no exits. Now
- thanks to our fix for 13718, we accept a no-exit network as not
- wholly lost, but we need to remember not to try to build exit
- circuits on it. Closes ticket 13814; patch by "teor".
- - Stop requiring exits to have non-zero bandwithcapacity in a
- TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
- ignore exit bandwidthcapacity. This assists in bootstrapping a
- testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
- on 0.2.0.3-alpha. Patch by "teor".
- - Add "internal" to some bootstrap statuses when no exits are
- available. If the consensus does not contain Exits, Tor will only
- build internal circuits. In this case, relevant statuses will
- contain the word "internal" as indicated in the Tor control-
- spec.txt. When bootstrap completes, Tor will be ready to build
- internal circuits. If a future consensus contains Exits, exit
- circuits may become available. Fixes part of bug 13718; bugfix on
- 0.2.4.10-alpha. Patch by "teor".
- - Decrease minimum consensus interval to 10 seconds when
- TestingTorNetwork is set, or 5 seconds for the first consensus.
- Fix assumptions throughout the code that assume larger intervals.
- Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
- by "teor".
- - Avoid excluding guards from path building in minimal test
- networks, when we're in a test network and excluding guards would
- exclude all relays. This typically occurs in incredibly small tor
- networks, and those using "TestingAuthVoteGuard *". Fixes part of
- bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
- o Code simplification and refactoring:
- - Stop using can_complete_circuits as a global variable; access it
- with a function instead.
- - Avoid using operators directly as macro arguments: this lets us
- apply coccinelle transformations to our codebase more directly.
- Closes ticket 13172.
- - Combine the functions used to parse ClientTransportPlugin and
- ServerTransportPlugin into a single function. Closes ticket 6456.
- - Add inline functions and convenience macros for inspecting channel
- state. Refactor the code to use convenience macros instead of
- checking channel state directly. Fixes issue 7356.
- - Document all members of was_router_added_t and rename
- ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
- confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
- - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
- constant instead of hardcoded value. Fixes issue 13840.
- - Refactor our generic strmap and digestmap types into a single
- implementation, so that we can add a new digest256map
- type trivially.
- o Documentation:
- - Document the bridge-authority-only 'networkstatus-bridges' file.
- Closes ticket 13713; patch from "tom".
- - Fix typo in PredictedPortsRelevanceTime option description in
- manpage. Resolves issue 13707.
- - Stop suggesting that users specify relays by nickname: it isn't a
- good idea. Also, properly cross-reference how to specify relays in
- all parts of manual documenting options that take a list of
- relays. Closes ticket 13381.
- - Clarify the HiddenServiceDir option description in manpage to make
- it clear that relative paths are taken with respect to the current
- working directory. Also clarify that this behavior is not
- guaranteed to remain indefinitely. Fixes issue 13913.
- o Testing:
- - New tests for many parts of channel, relay, and circuitmux
- functionality. Code by Andrea; part of 9262.
- - New tests for parse_transport_line(). Part of ticket 6456.
- - In the unit tests, use chgrp() to change the group of the unit
- test temporary directory to the current user, so that the sticky
- bit doesn't interfere with tests that check directory groups.
- Closes 13678.
- - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
- by 'rl1987'.
- Changes in version 0.2.6.1-alpha - 2014-10-30
- Tor 0.2.6.1-alpha is the first release in the Tor 0.2.6.x series. It
- includes numerous code cleanups and new tests, and fixes a large
- number of annoying bugs. Out-of-memory conditions are handled better
- than in 0.2.5, pluggable transports have improved proxy support, and
- clients now use optimistic data for contacting hidden services. Also,
- we are now more robust to changes in what we consider a parseable
- directory object, so that tightening restrictions does not have a risk
- of introducing infinite download loops.
- This is the first alpha release in a new series, so expect there to be
- bugs. Users who would rather test out a more stable branch should stay
- with 0.2.5.x for now.
- o New compiler and system requirements:
- - Tor 0.2.6.x requires that your compiler support more of the C99
- language standard than before. The 'configure' script now detects
- whether your compiler supports C99 mid-block declarations and
- designated initializers. If it does not, Tor will not compile.
- We may revisit this requirement if it turns out that a significant
- number of people need to build Tor with compilers that don't
- bother implementing a 15-year-old standard. Closes ticket 13233.
- - Tor no longer supports systems without threading support. When we
- began working on Tor, there were several systems that didn't have
- threads, or where the thread support wasn't able to run the
- threads of a single process on multiple CPUs. That no longer
- holds: every system where Tor needs to run well now has threading
- support. Resolves ticket 12439.
- o Removed platform support:
- - We no longer include special code to build on Windows CE; as far
- as we know, nobody has used Tor on Windows CE in a very long time.
- Closes ticket 11446.
- o Major features (bridges):
- - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
- transports if they are configured via the "TOR_PT_PROXY"
- environment variable. Implements proposal 232. Resolves
- ticket 8402.
- o Major features (client performance, hidden services):
- - Allow clients to use optimistic data when connecting to a hidden
- service, which should remove a round-trip from hidden service
- initialization. See proposal 181 for details. Implements
- ticket 13211.
- o Major features (directory system):
- - Upon receiving an unparseable directory object, if its digest
- matches what we expected, then don't try to download it again.
- Previously, when we got a descriptor we didn't like, we would keep
- trying to download it over and over. Closes ticket 11243.
- o Major features (sample torrc):
- - Add a new, infrequently-changed "torrc.minimal". This file is
- similar to torrc.sample, but it will change as infrequently as
- possible, for the benefit of users whose systems prompt them for
- intervention whenever a default configuration file is changed.
- Making this change allows us to update torrc.sample to be a more
- generally useful "sample torrc".
- o Major bugfixes (directory authorities):
- - Do not assign the HSDir flag to relays if they are not Valid, or
- currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
- o Major bugfixes (directory bandwidth performance):
- - Don't flush the zlib buffer aggressively when compressing
- directory information for clients. This should save about 7% of
- the bandwidth currently used for compressed descriptors and
- microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
- o Minor features (security, memory wiping):
- - Ensure we securely wipe keys from memory after
- crypto_digest_get_digest and init_curve25519_keypair_from_file
- have finished using them. Resolves ticket 13477.
- o Minor features (security, out-of-memory handling):
- - When handling an out-of-memory condition, allocate less memory for
- temporary data structures. Fixes issue 10115.
- - When handling an out-of-memory condition, consider more types of
- buffers, including those on directory connections, and zlib
- buffers. Resolves ticket 11792.
- o Minor features:
- - When identity keypair is generated for first time, log a
- congratulatory message that links to the new relay lifecycle
- document. Implements feature 10427.
- o Minor features (client):
- - Clients are now willing to send optimistic data (before they
- receive a 'connected' cell) to relays of any version. (Relays
- without support for optimistic data are no longer supported on the
- Tor network.) Resolves ticket 13153.
- o Minor features (directory authorities):
- - Don't list relays with a bandwidth estimate of 0 in the consensus.
- Implements a feature proposed during discussion of bug 13000.
- - In tor-gencert, report an error if the user provides the same
- argument more than once.
- - If a directory authority can't find a best consensus method in the
- votes that it holds, it now falls back to its favorite consensus
- method. Previously, it fell back to method 1. Neither of these is
- likely to get enough signatures, but "fall back to favorite"
- doesn't require us to maintain support an obsolete consensus
- method. Implements part of proposal 215.
- o Minor features (logging):
- - On Unix-like systems, you can now use named pipes as the target of
- the Log option, and other options that try to append to files.
- Closes ticket 12061. Patch from "carlo von lynX".
- - When opening a log file at startup, send it every log message that
- we generated between startup and opening it. Previously, log
- messages that were generated before opening the log file were only
- logged to stdout. Closes ticket 6938.
- - Add a TruncateLogFile option to overwrite logs instead of
- appending to them. Closes ticket 5583.
- o Minor features (portability, Solaris):
- - Threads are no longer disabled by default on Solaris; we believe
- that the versions of Solaris with broken threading support are all
- obsolete by now. Resolves ticket 9495.
- o Minor features (relay):
- - Re-check our address after we detect a changed IP address from
- getsockname(). This ensures that the controller command "GETINFO
- address" will report the correct value. Resolves ticket 11582.
- Patch from "ra".
- - A new AccountingRule option lets Relays set whether they'd like
- AccountingMax to be applied separately to inbound and outbound
- traffic, or applied to the sum of inbound and outbound traffic.
- Resolves ticket 961. Patch by "chobe".
- o Minor features (testing networks):
- - Add the TestingDirAuthVoteExit option, which lists nodes to assign
- the "Exit" flag regardless of their uptime, bandwidth, or exit
- policy. TestingTorNetwork must be set for this option to have any
- effect. Previously, authorities would take up to 35 minutes to
- give nodes the Exit flag in a test network. Partially implements
- ticket 13161.
- o Minor features (validation):
- - Check all date/time values passed to tor_timegm and
- parse_rfc1123_time for validity, taking leap years into account.
- Improves HTTP header validation. Implemented with bug 13476.
- - In correct_tm(), limit the range of values returned by system
- localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
- This means we don't have to deal with negative or too large dates,
- even if a clock is wrong. Otherwise we might fail to read a file
- written by us which includes such a date. Fixes bug 13476.
- o Minor bugfixes (bridge clients):
- - When configured to use a bridge without an identity digest (not
- recommended), avoid launching an extra channel to it when
- bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (bridges):
- - When DisableNetwork is set, do not launch pluggable transport
- plugins, and if any are running, terminate them. Fixes bug 13213;
- bugfix on 0.2.3.6-alpha.
- o Minor bugfixes (C correctness):
- - Fix several instances of possible integer overflow/underflow/NaN.
- Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
- from "teor".
- - In circuit_build_times_calculate_timeout() in circuitstats.c,
- avoid dividing by zero in the pareto calculations. This traps
- under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
- on 0.2.2.2-alpha.
- - Fix an integer overflow in format_time_interval(). Fixes bug
- 13393; bugfix on 0.2.0.10-alpha.
- - Set the correct day of year value when the system's localtime(_r)
- or gmtime(_r) functions fail to set struct tm. Not externally
- visible. Fixes bug 13476; bugfix on 0.0.2pre14.
- - Avoid unlikely signed integer overflow in tor_timegm on systems
- with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
- o Minor bugfixes (client):
- - Fix smartlist_choose_node_by_bandwidth() so that relays with the
- BadExit flag are not considered worthy candidates. Fixes bug
- 13066; bugfix on 0.1.2.3-alpha.
- - Use the consensus schedule for downloading consensuses, and not
- the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
- - Handle unsupported or malformed SOCKS5 requests properly by
- responding with the appropriate error message before closing the
- connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
- o Minor bugfixes (client, torrc):
- - Stop modifying the value of our DirReqStatistics torrc option just
- because we're not a bridge or relay. This bug was causing Tor
- Browser users to write "DirReqStatistics 0" in their torrc files
- as if they had chosen to change the config. Fixes bug 4244; bugfix
- on 0.2.3.1-alpha.
- - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
- that our options have changed every time we SIGHUP. Fixes bug
- 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
- o Minor bugfixes (controller):
- - Return an error when the second or later arguments of the
- "setevents" controller command are invalid events. Previously we
- would return success while silently skipping invalid events. Fixes
- bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
- o Minor bugfixes (directory system):
- - Always believe that v3 directory authorities serve extra-info
- documents, whether they advertise "caches-extra-info" or not.
- Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
- - When running as a v3 directory authority, advertise that you serve
- extra-info documents so that clients who want them can find them
- from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
- - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
- Previously, directories offering BRIDGE_DIRINFO and some other
- flag (i.e. microdescriptors or extrainfo) would be ignored when
- looking for bridges. Partially fixes bug 13163; bugfix
- on 0.2.0.7-alpha.
- o Minor bugfixes (networking):
- - Check for orconns and use connection_or_close_for_error() rather
- than connection_mark_for_close() directly in the getsockopt()
- failure case of connection_handle_write_impl(). Fixes bug 11302;
- bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (relay):
- - When generating our family list, remove spaces from around the
- entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
- - If our previous bandwidth estimate was 0 bytes, allow publishing a
- new relay descriptor immediately. Fixes bug 13000; bugfix
- on 0.1.1.6-alpha.
- o Minor bugfixes (testing networks):
- - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
- testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
- - Stop using the default authorities in networks which provide both
- AlternateDirAuthority and AlternateBridgeAuthority. Partially
- fixes bug 13163; bugfix on 0.2.0.13-alpha.
- o Minor bugfixes (testing):
- - Stop spawn test failures due to a race condition between the
- SIGCHLD handler updating the process status, and the test reading
- it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
- o Minor bugfixes (testing, Windows):
- - Avoid passing an extra backslash when creating a temporary
- directory for running the unit tests on Windows. Fixes bug 12392;
- bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
- o Minor bugfixes (windows):
- - Remove code to special-case handling of NTE_BAD_KEYSET when
- acquiring windows CryptoAPI context. This error can't actually
- occur for the parameters we're providing. Fixes bug 10816; bugfix
- on 0.0.2pre26.
- o Minor bugfixes (zlib):
- - Avoid truncating a zlib stream when trying to finalize it with an
- empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
- o Build fixes:
- - Allow our configure script to build correctly with autoconf 2.62
- again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
- - Improve the error message from ./configure to make it clear that
- when asciidoc has not been found, the user will have to either add
- --disable-asciidoc argument or install asciidoc. Resolves
- ticket 13228.
- o Code simplification and refactoring:
- - Change the entry_is_live() function to take named bitfield
- elements instead of an unnamed list of booleans. Closes
- ticket 12202.
- - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
- Resolves ticket 12205.
- - Use calloc and reallocarray functions instead of multiply-
- then-malloc. This makes it less likely for us to fall victim to an
- integer overflow attack when allocating. Resolves ticket 12855.
- - Use the standard macro name SIZE_MAX, instead of our
- own SIZE_T_MAX.
- - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
- functions which take them as arguments. Replace 0 with NO_DIRINFO
- in a function call for clarity. Seeks to prevent future issues
- like 13163.
- - Avoid 4 null pointer errors under clang static analysis by using
- tor_assert() to prove that the pointers aren't null. Fixes
- bug 13284.
- - Rework the API of policies_parse_exit_policy() to use a bitmask to
- represent parsing options, instead of a confusing mess of
- booleans. Resolves ticket 8197.
- - Introduce a helper function to parse ExitPolicy in
- or_options_t structure.
- o Documentation:
- - Add a doc/TUNING document with tips for handling large numbers of
- TCP connections when running busy Tor relay. Update the warning
- message to point to this file when running out of sockets
- operating system is allowing to use simultaneously. Resolves
- ticket 9708.
- o Removed features:
- - We no longer remind the user about configuration options that have
- been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
- - Remove our old, non-weighted bandwidth-based node selection code.
- Previously, we used it as a fallback when we couldn't perform
- weighted bandwidth-based node selection. But that would only
- happen in the cases where we had no consensus, or when we had a
- consensus generated by buggy or ancient directory authorities. In
- either case, it's better to use the more modern, better maintained
- algorithm, with reasonable defaults for the weights. Closes
- ticket 13126.
- - Remove the --disable-curve25519 configure option. Relays and
- clients now are required to support curve25519 and the
- ntor handshake.
- - The old "StrictEntryNodes" and "StrictExitNodes" options, which
- used to be deprecated synonyms for "StrictNodes", are now marked
- obsolete. Resolves ticket 12226.
- - Clients don't understand the BadDirectory flag in the consensus
- anymore, and ignore it.
- o Testing:
- - Refactor the function that chooses guard nodes so that it can more
- easily be tested; write some tests for it.
- - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
- bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
- - Create unit tests for format_time_interval(). With bug 13393.
- - Add unit tests for tor_timegm signed overflow, tor_timegm and
- parse_rfc1123_time validity checks, correct_tm year clamping. Unit
- tests (visible) fixes in bug 13476.
- - Add a "coverage-html" make target to generate HTML-visualized
- coverage results when building with --enable-coverage. (Requires
- lcov.) Patch from Kevin Murray.
- - Enable the backtrace handler (where supported) when running the
- unit tests.
- - Revise all unit tests that used the legacy test_* macros to
- instead use the recommended tt_* macros. This patch was generated
- with coccinelle, to avoid manual errors. Closes ticket 13119.
- o Distribution (systemd):
- - systemd unit file: only allow tor to write to /var/lib/tor and
- /var/log/tor. The rest of the filesystem is accessible for reading
- only. Patch by intrigeri; resolves ticket 12751.
- - systemd unit file: ensure that the process and all its children
- can never gain new privileges. Patch by intrigeri; resolves
- ticket 12939.
- - systemd unit file: set up /var/run/tor as writable for the Tor
- service. Patch by intrigeri; resolves ticket 13196.
- o Removed features (directory authorities):
- - Remove code that prevented authorities from listing Tor relays
- affected by CVE-2011-2769 as guards. These relays are already
- rejected altogether due to the minimum version requirement of
- 0.2.3.16-alpha. Closes ticket 13152.
- - The "AuthDirRejectUnlisted" option no longer has any effect, as
- the fingerprints file (approved-routers) has been deprecated.
- - Directory authorities do not support being Naming dirauths anymore.
- The "NamingAuthoritativeDir" config option is now obsolete.
- - Directory authorities do not support giving out the BadDirectory
- flag anymore.
- - Directory authorities no longer advertise or support consensus
- methods 1 through 12 inclusive. These consensus methods were
- obsolete and/or insecure: maintaining the ability to support them
- served no good purpose. Implements part of proposal 215; closes
- ticket 10163.
- o Testing (test-network.sh):
- - Stop using "echo -n", as some shells' built-in echo doesn't
- support "-n". Instead, use "/bin/echo -n". Partially fixes
- bug 13161.
- - Stop an apparent test-network hang when used with make -j2. Fixes
- bug 13331.
- - Add a --delay option to test-network.sh, which configures the
- delay before the chutney network tests for data transmission.
- Partially implements ticket 13161.
- Changes in version 0.2.5.10 - 2014-10-24
- Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
- It adds several new security features, including improved
- denial-of-service resistance for relays, new compiler hardening
- options, and a system-call sandbox for hardened installations on Linux
- (requires seccomp2). The controller protocol has several new features,
- resolving IPv6 addresses should work better than before, and relays
- should be a little more CPU-efficient. We've added support for more
- OpenBSD and FreeBSD transparent proxy types. We've improved the build
- system and testing infrastructure to allow unit testing of more parts
- of the Tor codebase. Finally, we've addressed several nagging pluggable
- transport usability issues, and included numerous other small bugfixes
- and features mentioned below.
- This release marks end-of-life for Tor 0.2.3.x; those Tor versions
- have accumulated many known flaws; everyone should upgrade.
- o Deprecated versions:
- - Tor 0.2.3.x has reached end-of-life; it has received no patches or
- attention for some while.
- Changes in version 0.2.5.9-rc - 2014-10-20
- Tor 0.2.5.9-rc is the third release candidate for the Tor 0.2.5.x
- series. It disables SSL3 in response to the recent "POODLE" attack
- (even though POODLE does not affect Tor). It also works around a crash
- bug caused by some operating systems' response to the "POODLE" attack
- (which does affect Tor). It also contains a few miscellaneous fixes.
- o Major security fixes:
- - Disable support for SSLv3. All versions of OpenSSL in use with Tor
- today support TLS 1.0 or later, so we can safely turn off support
- for this old (and insecure) protocol. Fixes bug 13426.
- o Major bugfixes (openssl bug workaround):
- - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
- 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
- 13471. This is a workaround for an OpenSSL bug.
- o Minor bugfixes:
- - Disable the sandbox name resolver cache when running tor-resolve:
- tor-resolve doesn't use the sandbox code, and turning it on was
- breaking attempts to do tor-resolve on a non-default server on
- Linux. Fixes bug 13295; bugfix on 0.2.5.3-alpha.
- o Compilation fixes:
- - Build and run correctly on systems like OpenBSD-current that have
- patched OpenSSL to remove get_cipher_by_char and/or its
- implementations. Fixes issue 13325.
- o Downgraded warnings:
- - Downgrade the severity of the 'unexpected sendme cell from client'
- from 'warn' to 'protocol warning'. Closes ticket 8093.
- Changes in version 0.2.4.25 - 2014-10-20
- Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
- (even though POODLE does not affect Tor). It also works around a crash
- bug caused by some operating systems' response to the "POODLE" attack
- (which does affect Tor).
- o Major security fixes (also in 0.2.5.9-rc):
- - Disable support for SSLv3. All versions of OpenSSL in use with Tor
- today support TLS 1.0 or later, so we can safely turn off support
- for this old (and insecure) protocol. Fixes bug 13426.
- o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
- - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
- 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
- 13471. This is a workaround for an OpenSSL bug.
- Changes in version 0.2.5.8-rc - 2014-09-22
- Tor 0.2.5.8-rc is the second release candidate for the Tor 0.2.5.x
- series. It fixes a bug that affects consistency and speed when
- connecting to hidden services, and it updates the location of one of
- the directory authorities.
- o Major bugfixes:
- - Clients now send the correct address for their chosen rendezvous
- point when trying to access a hidden service. They used to send
- the wrong address, which would still work some of the time because
- they also sent the identity digest of the rendezvous point, and if
- the hidden service happened to try connecting to the rendezvous
- point from a relay that already had a connection open to it,
- the relay would reuse that connection. Now connections to hidden
- services should be more robust and faster. Also, this bug meant
- that clients were leaking to the hidden service whether they were
- on a little-endian (common) or big-endian (rare) system, which for
- some users might have reduced their anonymity. Fixes bug 13151;
- bugfix on 0.2.1.5-alpha.
- o Directory authority changes:
- - Change IP address for gabelmoo (v3 directory authority).
- Changes in version 0.2.4.24 - 2014-09-22
- Tor 0.2.4.24 fixes a bug that affects consistency and speed when
- connecting to hidden services, and it updates the location of one of
- the directory authorities.
- o Major bugfixes:
- - Clients now send the correct address for their chosen rendezvous
- point when trying to access a hidden service. They used to send
- the wrong address, which would still work some of the time because
- they also sent the identity digest of the rendezvous point, and if
- the hidden service happened to try connecting to the rendezvous
- point from a relay that already had a connection open to it,
- the relay would reuse that connection. Now connections to hidden
- services should be more robust and faster. Also, this bug meant
- that clients were leaking to the hidden service whether they were
- on a little-endian (common) or big-endian (rare) system, which for
- some users might have reduced their anonymity. Fixes bug 13151;
- bugfix on 0.2.1.5-alpha.
- o Directory authority changes:
- - Change IP address for gabelmoo (v3 directory authority).
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.5.7-rc - 2014-09-11
- Tor 0.2.5.7-rc fixes several regressions from earlier in the 0.2.5.x
- release series, and some long-standing bugs related to ORPort reachability
- testing and failure to send CREATE cells. It is the first release
- candidate for the Tor 0.2.5.x series.
- o Major bugfixes (client, startup):
- - Start making circuits as soon as DisabledNetwork is turned off.
- When Tor started with DisabledNetwork set, it would correctly
- conclude that it shouldn't build circuits, but it would mistakenly
- cache this conclusion, and continue believing it even when
- DisableNetwork is set to 0. Fixes the bug introduced by the fix
- for bug 11200; bugfix on 0.2.5.4-alpha.
- - Resume expanding abbreviations for command-line options. The fix
- for bug 4647 accidentally removed our hack from bug 586 that
- rewrote HashedControlPassword to __HashedControlSessionPassword
- when it appears on the commandline (which allowed the user to set
- her own HashedControlPassword in the torrc file while the
- controller generates a fresh session password for each run). Fixes
- bug 12948; bugfix on 0.2.5.1-alpha.
- - Warn about attempts to run hidden services and relays in the same
- process: that's probably not a good idea. Closes ticket 12908.
- o Major bugfixes (relay):
- - Avoid queuing or sending destroy cells for circuit ID zero when we
- fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
- Found and fixed by "cypherpunks".
- - Fix ORPort reachability detection on relays running behind a
- proxy, by correctly updating the "local" mark on the controlling
- channel when changing the address of an or_connection_t after the
- handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
- o Minor features (bridge):
- - Add an ExtORPortCookieAuthFileGroupReadable option to make the
- cookie file for the ExtORPort g+r by default.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (logging):
- - Reduce the log severity of the "Pluggable transport proxy does not
- provide any needed transports and will not be launched." message,
- since Tor Browser includes several ClientTransportPlugin lines in
- its torrc-defaults file, leading every Tor Browser user who looks
- at her logs to see these notices and wonder if they're dangerous.
- Resolves bug 13124; bugfix on 0.2.5.3-alpha.
- - Downgrade "Unexpected onionskin length after decryption" warning
- to a protocol-warn, since there's nothing relay operators can do
- about a client that sends them a malformed create cell. Resolves
- bug 12996; bugfix on 0.0.6rc1.
- - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
- cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
- - When logging information about an EXTEND2 or EXTENDED2 cell, log
- their names correctly. Fixes part of bug 12700; bugfix
- on 0.2.4.8-alpha.
- - When logging information about a relay cell whose command we don't
- recognize, log its command as an integer. Fixes part of bug 12700;
- bugfix on 0.2.1.10-alpha.
- - Escape all strings from the directory connection before logging
- them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
- o Minor bugfixes (controller):
- - Restore the functionality of CookieAuthFileGroupReadable. Fixes
- bug 12864; bugfix on 0.2.5.1-alpha.
- - Actually send TRANSPORT_LAUNCHED and HS_DESC events to
- controllers. Fixes bug 13085; bugfix on 0.2.5.1-alpha. Patch
- by "teor".
- o Minor bugfixes (compilation):
- - Fix compilation of test.h with MSVC. Patch from Gisle Vanem;
- bugfix on 0.2.5.5-alpha.
- - Make the nmake make files work again. Fixes bug 13081. Bugfix on
- 0.2.5.1-alpha. Patch from "NewEraCracker".
- - In routerlist_assert_ok(), don't take the address of a
- routerinfo's cache_info member unless that routerinfo is non-NULL.
- Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
- - Fix a large number of false positive warnings from the clang
- analyzer static analysis tool. This should make real warnings
- easier for clang analyzer to find. Patch from "teor". Closes
- ticket 13036.
- o Distribution (systemd):
- - Verify configuration file via ExecStartPre in the systemd unit
- file. Patch from intrigeri; resolves ticket 12730.
- - Explicitly disable RunAsDaemon in the systemd unit file. Our
- current systemd unit uses "Type = simple", so systemd does not
- expect tor to fork. If the user has "RunAsDaemon 1" in their
- torrc, then things won't work as expected. This is e.g. the case
- on Debian (and derivatives), since there we pass "--defaults-torrc
- /usr/share/tor/tor-service-defaults-torrc" (that contains
- "RunAsDaemon 1") by default. Patch by intrigeri; resolves
- ticket 12731.
- o Documentation:
- - Adjust the URLs in the README to refer to the new locations of
- several documents on the website. Fixes bug 12830. Patch from
- Matt Pagan.
- - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
- ticket 12878.
- Changes in version 0.2.5.6-alpha - 2014-07-28
- Tor 0.2.5.6-alpha brings us a big step closer to slowing down the
- risk from guard rotation, and fixes a variety of other issues to get
- us closer to a release candidate.
- o Major features (also in 0.2.4.23):
- - Make the number of entry guards configurable via a new
- NumEntryGuards consensus parameter, and the number of directory
- guards configurable via a new NumDirectoryGuards consensus
- parameter. Implements ticket 12688.
- o Major bugfixes (also in 0.2.4.23):
- - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
- implementation that caused incorrect results on 32-bit
- implementations when certain malformed inputs were used along with
- a small class of private ntor keys. This bug does not currently
- appear to allow an attacker to learn private keys or impersonate a
- Tor server, but it could provide a means to distinguish 32-bit Tor
- implementations from 64-bit Tor implementations. Fixes bug 12694;
- bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
- Adam Langley.
- o Major bugfixes:
- - Perform circuit cleanup operations even when circuit
- construction operations are disabled (because the network is
- disabled, or because there isn't enough directory information).
- Previously, when we were not building predictive circuits, we
- were not closing expired circuits either. Fixes bug 8387; bugfix on
- 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
- became more strict about when we have "enough directory information
- to build circuits".
- o Minor features:
- - Authorities now assign the Guard flag to the fastest 25% of the
- network (it used to be the fastest 50%). Also raise the consensus
- weight that guarantees the Guard flag from 250 to 2000. For the
- current network, this results in about 1100 guards, down from 2500.
- This step paves the way for moving the number of entry guards
- down to 1 (proposal 236) while still providing reasonable expected
- performance for most users. Implements ticket 12690.
- - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
- Country database.
- - Slightly enhance the diagnostic message for bug 12184.
- o Minor bugfixes (also in 0.2.4.23):
- - Warn and drop the circuit if we receive an inbound 'relay early'
- cell. Those used to be normal to receive on hidden service circuits
- due to bug 1038, but the buggy Tor versions are long gone from
- the network so we can afford to resume watching for them. Resolves
- the rest of bug 1038; bugfix on 0.2.1.19.
- - Correct a confusing error message when trying to extend a circuit
- via the control protocol but we don't know a descriptor or
- microdescriptor for one of the specified relays. Fixes bug 12718;
- bugfix on 0.2.3.1-alpha.
- o Minor bugfixes:
- - Fix compilation when building with bufferevents enabled. (This
- configuration is still not expected to work, however.)
- Fixes bugs 12438, 12474, 11578; bugfixes on 0.2.5.1-alpha and
- 0.2.5.3-alpha. Patches from Anthony G. Basile and Sathyanarayanan
- Gunasekaran.
- - Compile correctly with builds and forks of OpenSSL (such as
- LibreSSL) that disable compression. Fixes bug 12602; bugfix on
- 0.2.1.1-alpha. Patch from "dhill".
- Changes in version 0.2.4.23 - 2014-07-28
- Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
- guard rotation, and also backports several important fixes from the
- Tor 0.2.5 alpha release series.
- o Major features:
- - Clients now look at the "usecreatefast" consensus parameter to
- decide whether to use CREATE_FAST or CREATE cells for the first hop
- of their circuit. This approach can improve security on connections
- where Tor's circuit handshake is stronger than the available TLS
- connection security levels, but the tradeoff is more computational
- load on guard relays. Implements proposal 221. Resolves ticket 9386.
- - Make the number of entry guards configurable via a new
- NumEntryGuards consensus parameter, and the number of directory
- guards configurable via a new NumDirectoryGuards consensus
- parameter. Implements ticket 12688.
- o Major bugfixes:
- - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
- implementation that caused incorrect results on 32-bit
- implementations when certain malformed inputs were used along with
- a small class of private ntor keys. This bug does not currently
- appear to allow an attacker to learn private keys or impersonate a
- Tor server, but it could provide a means to distinguish 32-bit Tor
- implementations from 64-bit Tor implementations. Fixes bug 12694;
- bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
- Adam Langley.
- o Minor bugfixes:
- - Warn and drop the circuit if we receive an inbound 'relay early'
- cell. Those used to be normal to receive on hidden service circuits
- due to bug 1038, but the buggy Tor versions are long gone from
- the network so we can afford to resume watching for them. Resolves
- the rest of bug 1038; bugfix on 0.2.1.19.
- - Correct a confusing error message when trying to extend a circuit
- via the control protocol but we don't know a descriptor or
- microdescriptor for one of the specified relays. Fixes bug 12718;
- bugfix on 0.2.3.1-alpha.
- - Avoid an illegal read from stack when initializing the TLS
- module using a version of OpenSSL without all of the ciphers
- used by the v2 link handshake. Fixes bug 12227; bugfix on
- 0.2.4.8-alpha. Found by "starlight".
- o Minor features:
- - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.5.5-alpha - 2014-06-18
- Tor 0.2.5.5-alpha fixes a wide variety of remaining issues in the Tor
- 0.2.5.x release series, including a couple of DoS issues, some
- performance regressions, a large number of bugs affecting the Linux
- seccomp2 sandbox code, and various other bugfixes. It also adds
- diagnostic bugfixes for a few tricky issues that we're trying to
- track down.
- o Major features (security, traffic analysis resistance):
- - Several major improvements to the algorithm used to decide when to
- close TLS connections. Previous versions of Tor closed connections
- at a fixed interval after the last time a non-padding cell was
- sent over the connection, regardless of the target of the
- connection. Now, we randomize the intervals by adding up to 50% of
- their base value, we measure the length of time since connection
- last had at least one circuit, and we allow connections to known
- ORs to remain open a little longer (15 minutes instead of 3
- minutes minimum). These changes should improve Tor's resistance
- against some kinds of traffic analysis, and lower some overhead
- from needlessly closed connections. Fixes ticket 6799.
- Incidentally fixes ticket 12023; bugfix on 0.2.5.1-alpha.
- o Major bugfixes (security, OOM, new since 0.2.5.4-alpha, also in 0.2.4.22):
- - Fix a memory leak that could occur if a microdescriptor parse
- fails during the tokenizing step. This bug could enable a memory
- exhaustion attack by directory servers. Fixes bug 11649; bugfix
- on 0.2.2.6-alpha.
- o Major bugfixes (security, directory authorities):
- - Directory authorities now include a digest of each relay's
- identity key as a part of its microdescriptor.
- This is a workaround for bug 11743 (reported by "cypherpunks"),
- where Tor clients do not support receiving multiple
- microdescriptors with the same SHA256 digest in the same
- consensus. When clients receive a consensus like this, they only
- use one of the relays. Without this fix, a hostile relay could
- selectively disable some client use of target relays by
- constructing a router descriptor with a different identity and the
- same microdescriptor parameters and getting the authorities to
- list it in a microdescriptor consensus. This fix prevents an
- attacker from causing a microdescriptor collision, because the
- router's identity is not forgeable.
- o Major bugfixes (relay):
- - Use a direct dirport connection when uploading non-anonymous
- descriptors to the directory authorities. Previously, relays would
- incorrectly use tunnel connections under a fairly wide variety of
- circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
- - When a circuit accidentally has the same circuit ID for its
- forward and reverse direction, correctly detect the direction of
- cells using that circuit. Previously, this bug made roughly one
- circuit in a million non-functional. Fixes bug 12195; this is a
- bugfix on every version of Tor.
- o Major bugfixes (client, pluggable transports):
- - When managing pluggable transports, use OS notification facilities
- to learn if they have crashed, and don't attempt to kill any
- process that has already exited. Fixes bug 8746; bugfix
- on 0.2.3.6-alpha.
- o Minor features (diagnostic):
- - When logging a warning because of bug 7164, additionally check the
- hash table for consistency (as proposed on ticket 11737). This may
- help diagnose bug 7164.
- - When we log a heartbeat, log how many one-hop circuits we have
- that are at least 30 minutes old, and log status information about
- a few of them. This is an attempt to track down bug 8387.
- - When encountering an unexpected CR while writing text to a file on
- Windows, log the name of the file. Should help diagnosing
- bug 11233.
- - Give more specific warnings when a client notices that an onion
- handshake has failed. Fixes ticket 9635.
- - Add significant new logging code to attempt to diagnose bug 12184,
- where relays seem to run out of available circuit IDs.
- - Improve the diagnostic log message for bug 8387 even further to
- try to improve our odds of figuring out why one-hop directory
- circuits sometimes do not get closed.
- o Minor features (security, memory management):
- - Memory allocation tricks (mempools and buffer freelists) are now
- disabled by default. You can turn them back on with
- --enable-mempools and --enable-buf-freelists respectively. We're
- disabling these features because malloc performance is good enough
- on most platforms, and a similar feature in OpenSSL exacerbated
- exploitation of the Heartbleed attack. Resolves ticket 11476.
- o Minor features (security):
- - Apply the secure SipHash-2-4 function to the hash table mapping
- circuit IDs and channels to circuits. We missed this one when we
- were converting all the other hash functions to use SipHash back
- in 0.2.5.3-alpha. Resolves ticket 11750.
- o Minor features (build):
- - The configure script has a --disable-seccomp option to turn off
- support for libseccomp on systems that have it, in case it (or
- Tor's use of it) is broken. Resolves ticket 11628.
- o Minor features (other):
- - Update geoip and geoip6 to the June 4 2014 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (security, new since 0.2.5.4-alpha, also in 0.2.4.22):
- - When running a hidden service, do not allow TunneledDirConns 0;
- this will keep the hidden service from running, and also
- make it publish its descriptors directly over HTTP. Fixes bug 10849;
- bugfix on 0.2.1.1-alpha.
- o Minor bugfixes (performance):
- - Avoid a bug where every successful connection made us recompute
- the flag telling us whether we have sufficient information to
- build circuits. Previously, we would forget our cached value
- whenever we successfully opened a channel (or marked a router as
- running or not running for any other reason), regardless of
- whether we had previously believed the router to be running. This
- forced us to run an expensive update operation far too often.
- Fixes bug 12170; bugfix on 0.1.2.1-alpha.
- - Avoid using tor_memeq() for checking relay cell integrity. This
- removes a possible performance bottleneck. Fixes part of bug
- 12169; bugfix on 0.2.1.31.
- o Minor bugfixes (compilation):
- - Fix compilation of test_status.c when building with MVSC. Bugfix
- on 0.2.5.4-alpha. Patch from Gisle Vanem.
- - Resolve GCC complaints on OpenBSD about discarding constness in
- TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
- on 0.1.1.23. Patch from Dana Koch.
- - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
- treatment of long and time_t as comparable types. Fixes part of
- bug 11633. Patch from Dana Koch.
- - Make Tor compile correctly with --disable-buf-freelists. Fixes bug
- 11623; bugfix on 0.2.5.3-alpha.
- - When deciding whether to build the 64-bit curve25519
- implementation, detect platforms where we can compile 128-bit
- arithmetic but cannot link it. Fixes bug 11729; bugfix on
- 0.2.4.8-alpha. Patch from "conradev".
- - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
- bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
- - Fix compilation with dmalloc. Fixes bug 11605; bugfix
- on 0.2.4.10-alpha.
- o Minor bugfixes (Directory server):
- - When sending a compressed set of descriptors or microdescriptors,
- make sure to finalize the zlib stream. Previously, we would write
- all the compressed data, but if the last descriptor we wanted to
- send was missing or too old, we would not mark the stream as
- finished. This caused problems for decompression tools. Fixes bug
- 11648; bugfix on 0.1.1.23.
- o Minor bugfixes (Linux seccomp sandbox):
- - Make the seccomp sandbox code compile under ARM Linux. Fixes bug
- 11622; bugfix on 0.2.5.1-alpha.
- - Avoid crashing when re-opening listener ports with the seccomp
- sandbox active. Fixes bug 12115; bugfix on 0.2.5.1-alpha.
- - Avoid crashing with the seccomp sandbox enabled along with
- ConstrainedSockets. Fixes bug 12139; bugfix on 0.2.5.1-alpha.
- - When we receive a SIGHUP with the sandbox enabled, correctly
- support rotating our log files. Fixes bug 12032; bugfix
- on 0.2.5.1-alpha.
- - Avoid crash when running with sandboxing enabled and
- DirReqStatistics not disabled. Fixes bug 12035; bugfix
- on 0.2.5.1-alpha.
- - Fix a "BUG" warning when trying to write bridge-stats files with
- the Linux syscall sandbox filter enabled. Fixes bug 12041; bugfix
- on 0.2.5.1-alpha.
- - Prevent the sandbox from crashing on startup when run with the
- --enable-expensive-hardening configuration option. Fixes bug
- 11477; bugfix on 0.2.5.4-alpha.
- - When running with DirPortFrontPage and sandboxing both enabled,
- reload the DirPortFrontPage correctly when restarting. Fixes bug
- 12028; bugfix on 0.2.5.1-alpha.
- - Don't try to enable the sandbox when using the Tor binary to check
- its configuration, hash a passphrase, or so on. Doing so was
- crashing on startup for some users. Fixes bug 11609; bugfix
- on 0.2.5.1-alpha.
- - Avoid warnings when running with sandboxing and node statistics
- enabled at the same time. Fixes part of 12064; bugfix on
- 0.2.5.1-alpha. Patch from Michael Wolf.
- - Avoid warnings when running with sandboxing enabled at the same
- time as cookie authentication, hidden services, or directory
- authority voting. Fixes part of 12064; bugfix on 0.2.5.1-alpha.
- - Do not allow options that require calls to exec to be enabled
- alongside the seccomp2 sandbox: they will inevitably crash. Fixes
- bug 12043; bugfix on 0.2.5.1-alpha.
- - Handle failures in getpwnam()/getpwuid() when running with the
- User option set and the Linux syscall sandbox enabled. Fixes bug
- 11946; bugfix on 0.2.5.1-alpha.
- - Refactor the getaddrinfo workaround that the seccomp sandbox uses
- to avoid calling getaddrinfo() after installing the sandbox
- filters. Previously, it preloaded a cache with the IPv4 address
- for our hostname, and nothing else. Now, it loads the cache with
- every address that it used to initialize the Tor process. Fixes
- bug 11970; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (pluggable transports):
- - Enable the ExtORPortCookieAuthFile option, to allow changing the
- default location of the authentication token for the extended OR
- Port as used by sever-side pluggable transports. We had
- implemented this option before, but the code to make it settable
- had been omitted. Fixes bug 11635; bugfix on 0.2.5.1-alpha.
- - Avoid another 60-second delay when starting Tor in a pluggable-
- transport-using configuration when we already have cached
- descriptors for our bridges. Fixes bug 11965; bugfix
- on 0.2.3.6-alpha.
- o Minor bugfixes (client):
- - Avoid "Tried to open a socket with DisableNetwork set" warnings
- when starting a client with bridges configured and DisableNetwork
- set. (Tor launcher starts Tor with DisableNetwork set the first
- time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
- o Minor bugfixes (testing):
- - The Python parts of the test scripts now work on Python 3 as well
- as Python 2, so systems where '/usr/bin/python' is Python 3 will
- no longer have the tests break. Fixes bug 11608; bugfix
- on 0.2.5.2-alpha.
- - When looking for versions of python that we could run the tests
- with, check for "python2.7" and "python3.3"; previously we were
- only looking for "python", "python2", and "python3". Patch from
- Dana Koch. Fixes bug 11632; bugfix on 0.2.5.2-alpha.
- - Fix all valgrind warnings produced by the unit tests. There were
- over a thousand memory leak warnings previously, mostly produced
- by forgetting to free things in the unit test code. Fixes bug
- 11618, bugfixes on many versions of Tor.
- o Minor bugfixes (tor-fw-helper):
- - Give a correct log message when tor-fw-helper fails to launch.
- (Previously, we would say something like "tor-fw-helper sent us a
- string we could not parse".) Fixes bug 9781; bugfix
- on 0.2.4.2-alpha.
- o Minor bugfixes (relay, threading):
- - Check return code on spawn_func() in cpuworker code, so that we
- don't think we've spawned a nonworking cpuworker and write junk to
- it forever. Fix related to bug 4345; bugfix on all released Tor
- versions. Found by "skruffy".
- - Use a pthread_attr to make sure that spawn_func() cannot return an
- error while at the same time launching a thread. Fix related to
- bug 4345; bugfix on all released Tor versions. Reported
- by "cypherpunks".
- o Minor bugfixes (relay, oom prevention):
- - Correctly detect the total available system memory. We tried to do
- this in 0.2.5.4-alpha, but the code was set up to always return an
- error value, even on success. Fixes bug 11805; bugfix
- on 0.2.5.4-alpha.
- o Minor bugfixes (relay, other):
- - We now drop CREATE cells for already-existent circuit IDs and for
- zero-valued circuit IDs, regardless of other factors that might
- otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
- on 0.0.8pre1.
- - Avoid an illegal read from stack when initializing the TLS module
- using a version of OpenSSL without all of the ciphers used by the
- v2 link handshake. Fixes bug 12227; bugfix on 0.2.4.8-alpha. Found
- by "starlight".
- - When rejecting DATA cells for stream_id zero, still count them
- against the circuit's deliver window so that we don't fail to send
- a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (logging):
- - Fix a misformatted log message about delayed directory fetches.
- Fixes bug 11654; bugfix on 0.2.5.3-alpha.
- - Squelch a spurious LD_BUG message "No origin circuit for
- successful SOCKS stream" in certain hidden service failure cases;
- fixes bug 10616.
- o Distribution:
- - Include a tor.service file in contrib/dist for use with systemd.
- Some distributions will be able to use this file unmodified;
- others will need to tweak it, or write their own. Patch from Jamie
- Nguyen; resolves ticket 8368.
- o Documentation:
- - Clean up several option names in the manpage to match their real
- names, add the missing documentation for a couple of testing and
- directory authority options, remove the documentation for a
- V2-directory fetching option that no longer exists. Resolves
- ticket 11634.
- - Correct the documentation so that it lists the correct directory
- for the stats files. (They are in a subdirectory called "stats",
- not "status".)
- - In the manpage, move more authority-only options into the
- directory authority section so that operators of regular directory
- caches don't get confused.
- o Package cleanup:
- - The contrib directory has been sorted and tidied. Before, it was
- an unsorted dumping ground for useful and not-so-useful things.
- Now, it is divided based on functionality, and the items which
- seemed to be nonfunctional or useless have been removed. Resolves
- ticket 8966; based on patches from "rl1987".
- o Removed code:
- - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
- and MTBF calculations, but that nobody was using. Fixes ticket 11742.
- - The TunnelDirConns and PreferTunnelledDirConns options no longer
- exist; tunneled directory connections have been available since
- 0.1.2.5-alpha, and turning them off is not a good idea. This is a
- brute-force fix for 10849, where "TunnelDirConns 0" would break
- hidden services.
- Changes in version 0.2.4.22 - 2014-05-16
- Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
- alpha release series. These include blocking all authority signing
- keys that may have been affected by the OpenSSL "heartbleed" bug,
- choosing a far more secure set of TLS ciphersuites by default, closing
- a couple of memory leaks that could be used to run a target relay out
- of RAM, and several others.
- o Major features (security, backport from 0.2.5.4-alpha):
- - Block authority signing keys that were used on authorities
- vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
- don't have any evidence that these keys _were_ compromised; we're
- doing this to be prudent.) Resolves ticket 11464.
- o Major bugfixes (security, OOM):
- - Fix a memory leak that could occur if a microdescriptor parse
- fails during the tokenizing step. This bug could enable a memory
- exhaustion attack by directory servers. Fixes bug 11649; bugfix
- on 0.2.2.6-alpha.
- o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
- - The relay ciphersuite list is now generated automatically based on
- uniform criteria, and includes all OpenSSL ciphersuites with
- acceptable strength and forward secrecy. Previously, we had left
- some perfectly fine ciphersuites unsupported due to omission or
- typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
- 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
- - Relays now trust themselves to have a better view than clients of
- which TLS ciphersuites are better than others. (Thanks to bug
- 11513, the relay list is now well-considered, whereas the client
- list has been chosen mainly for anti-fingerprinting purposes.)
- Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
- CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
- AES128. Resolves ticket 11528.
- - Clients now try to advertise the same list of ciphersuites as
- Firefox 28. This change enables selection of (fast) GCM
- ciphersuites, disables some strange old ciphers, and stops
- advertising the ECDH (not to be confused with ECDHE) ciphersuites.
- Resolves ticket 11438.
- o Minor bugfixes (configuration, security):
- - When running a hidden service, do not allow TunneledDirConns 0:
- trying to set that option together with a hidden service would
- otherwise prevent the hidden service from running, and also make
- it publish its descriptors directly over HTTP. Fixes bug 10849;
- bugfix on 0.2.1.1-alpha.
- o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
- - Avoid sending a garbage value to the controller when a circuit is
- cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
- o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
- - Stop leaking memory when we successfully resolve a PTR record.
- Fixes bug 11437; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
- - Avoid 60-second delays in the bootstrapping process when Tor is
- launching for a second time while using bridges. Fixes bug 9229;
- bugfix on 0.2.0.3-alpha.
- o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
- - Give the correct URL in the warning message when trying to run a
- relay on an ancient version of Windows. Fixes bug 9393.
- o Minor bugfixes (compilation):
- - Fix a compilation error when compiling with --disable-curve25519.
- Fixes bug 9700; bugfix on 0.2.4.17-rc.
- o Minor bugfixes:
- - Downgrade the warning severity for the the "md was still
- referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
- for trying to diagnose this bug, and the current warning in
- earlier versions of tor achieves nothing useful. Addresses warning
- from bug 7164.
- o Minor features (log verbosity, backport from 0.2.5.4-alpha):
- - When we run out of usable circuit IDs on a channel, log only one
- warning for the whole channel, and describe how many circuits
- there were on the channel. Fixes part of ticket 11553.
- o Minor features (security, backport from 0.2.5.4-alpha):
- - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
- leave the default at 8GBytes), to better support Raspberry Pi
- users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
- o Documentation (backport from 0.2.5.4-alpha):
- - Correctly document that we search for a system torrc file before
- looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
- 0.2.3.18-rc.
- Changes in version 0.2.5.4-alpha - 2014-04-25
- Tor 0.2.5.4-alpha includes several security and performance
- improvements for clients and relays, including blacklisting authority
- signing keys that were used while susceptible to the OpenSSL
- "heartbleed" bug, fixing two expensive functions on busy relays,
- improved TLS ciphersuite preference lists, support for run-time
- hardening on compilers that support AddressSanitizer, and more work on
- the Linux sandbox code.
- There are also several usability fixes for clients (especially clients
- that use bridges), two new TransPort protocols supported (one on
- OpenBSD, one on FreeBSD), and various other bugfixes.
- This release marks end-of-life for Tor 0.2.2.x; those Tor versions
- have accumulated many known flaws; everyone should upgrade.
- o Major features (security):
- - If you don't specify MaxMemInQueues yourself, Tor now tries to
- pick a good value based on your total system memory. Previously,
- the default was always 8 GB. You can still override the default by
- setting MaxMemInQueues yourself. Resolves ticket 11396.
- - Block authority signing keys that were used on authorities
- vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
- don't have any evidence that these keys _were_ compromised; we're
- doing this to be prudent.) Resolves ticket 11464.
- o Major features (relay performance):
- - Speed up server-side lookups of rendezvous and introduction point
- circuits by using hashtables instead of linear searches. These
- functions previously accounted between 3 and 7% of CPU usage on
- some busy relays. Resolves ticket 9841.
- - Avoid wasting CPU when extending a circuit over a channel that is
- nearly out of circuit IDs. Previously, we would do a linear scan
- over possible circuit IDs before finding one or deciding that we
- had exhausted our possibilities. Now, we try at most 64 random
- circuit IDs before deciding that we probably won't succeed. Fixes
- a possible root cause of ticket 11553.
- o Major features (seccomp2 sandbox, Linux only):
- - The seccomp2 sandbox can now run a test network for multiple hours
- without crashing. The sandbox is still experimental, and more bugs
- will probably turn up. To try it, enable "Sandbox 1" on a Linux
- host. Resolves ticket 11351.
- - Strengthen sandbox code: the sandbox can now test the arguments
- for rename(), and blocks _sysctl() entirely. Resolves another part
- of ticket 11351.
- - When the sandbox blocks a system call, it now tries to log a stack
- trace before exiting. Resolves ticket 11465.
- o Major bugfixes (TLS cipher selection):
- - The relay ciphersuite list is now generated automatically based on
- uniform criteria, and includes all OpenSSL ciphersuites with
- acceptable strength and forward secrecy. Previously, we had left
- some perfectly fine ciphersuites unsupported due to omission or
- typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
- 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
- - Relays now trust themselves to have a better view than clients of
- which TLS ciphersuites are better than others. (Thanks to bug
- 11513, the relay list is now well-considered, whereas the client
- list has been chosen mainly for anti-fingerprinting purposes.)
- Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
- CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
- AES128. Resolves ticket 11528.
- - Clients now try to advertise the same list of ciphersuites as
- Firefox 28. This change enables selection of (fast) GCM
- ciphersuites, disables some strange old ciphers, and stops
- advertising the ECDH (not to be confused with ECDHE) ciphersuites.
- Resolves ticket 11438.
- o Major bugfixes (bridge client):
- - Avoid 60-second delays in the bootstrapping process when Tor is
- launching for a second time while using bridges. Fixes bug 9229;
- bugfix on 0.2.0.3-alpha.
- o Minor features (transparent proxy, *BSD):
- - Support FreeBSD's ipfw firewall interface for TransPort ports on
- FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
- 10267; patch from "yurivict".
- - Support OpenBSD's divert-to rules with the pf firewall for
- transparent proxy ports. To enable it, set "TransProxyType
- pf-divert". This allows Tor to run a TransPort transparent proxy
- port on OpenBSD 4.4 or later without root privileges. See the
- pf.conf(5) manual page for information on configuring pf to use
- divert-to rules. Closes ticket 10896; patch from Dana Koch.
- o Minor features (security):
- - New --enable-expensive-hardening option to enable security
- hardening options that consume nontrivial amounts of CPU and
- memory. Right now, this includes AddressSanitizer and UbSan, which
- are supported in newer versions of GCC and Clang. Closes ticket
- 11477.
- o Minor features (log verbosity):
- - Demote the message that we give when a flushing connection times
- out for too long from NOTICE to INFO. It was usually meaningless.
- Resolves ticket 5286.
- - Don't log so many notice-level bootstrapping messages at startup
- about downloading descriptors. Previously, we'd log a notice
- whenever we learned about more routers. Now, we only log a notice
- at every 5% of progress. Fixes bug 9963.
- - Warn less verbosely when receiving a malformed
- ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
- - When we run out of usable circuit IDs on a channel, log only one
- warning for the whole channel, and describe how many circuits
- there were on the channel. Fixes part of ticket 11553.
- o Minor features (relay):
- - If a circuit timed out for at least 3 minutes, check if we have a
- new external IP address, and publish a new descriptor with the new
- IP address if it changed. Resolves ticket 2454.
- o Minor features (controller):
- - Make the entire exit policy available from the control port via
- GETINFO exit-policy/*. Implements enhancement 7952. Patch from
- "rl1987".
- - Because of the fix for ticket 11396, the real limit for memory
- usage may no longer match the configured MaxMemInQueues value. The
- real limit is now exposed via GETINFO limits/max-mem-in-queues.
- o Minor features (bridge client):
- - Report a more useful failure message when we can't connect to a
- bridge because we don't have the right pluggable transport
- configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
- o Minor features (diagnostic):
- - Add more log messages to diagnose bug 7164, which causes
- intermittent "microdesc_free() called but md was still referenced"
- warnings. We now include more information, to figure out why we
- might be cleaning a microdescriptor for being too old if it's
- still referenced by a live node_t object.
- o Minor bugfixes (client, DNSPort):
- - When using DNSPort, try to respond to AAAA requests with AAAA
- answers. Previously, we hadn't looked at the request type when
- deciding which answer type to prefer. Fixes bug 10468; bugfix on
- 0.2.4.7-alpha.
- - When receiving a DNS query for an unsupported record type, reply
- with no answer rather than with a NOTIMPL error. This behavior
- isn't correct either, but it will break fewer client programs, we
- hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
- from "epoch".
- o Minor bugfixes (exit relay):
- - Stop leaking memory when we successfully resolve a PTR record.
- Fixes bug 11437; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (bridge client):
- - Stop accepting bridge lines containing hostnames. Doing so would
- cause clients to perform DNS requests on the hostnames, which was
- not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
- - Avoid a 60-second delay in the bootstrapping process when a Tor
- client with pluggable transports re-reads its configuration at
- just the wrong time. Re-fixes bug 11156; bugfix on 0.2.5.3-alpha.
- o Minor bugfixes (client, logging during bootstrap):
- - Warn only once if we start logging in an unsafe way. Previously,
- we complain as many times as we had problems. Fixes bug 9870;
- bugfix on 0.2.5.1-alpha.
- - Only report the first fatal bootstrap error on a given OR
- connection. This stops us from telling the controller bogus error
- messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
- - Be more helpful when trying to run sandboxed on Linux without
- libseccomp. Instead of saying "Sandbox is not implemented on this
- platform", we now explain that we need to be built with
- libseccomp. Fixes bug 11543; bugfix on 0.2.5.1-alpha.
- - Avoid generating spurious warnings when starting with
- DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
- 0.2.3.9-alpha.
- o Minor bugfixes (closing OR connections):
- - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
- check if it's an or_connection_t and correctly call
- connection_or_close_for_error() rather than
- connection_mark_for_close() directly. Fixes bug 11304; bugfix on
- 0.2.4.4-alpha.
- - When closing all connections on setting DisableNetwork to 1, use
- connection_or_close_normally() rather than closing OR connections
- out from under the channel layer. Fixes bug 11306; bugfix on
- 0.2.4.4-alpha.
- o Minor bugfixes (controller):
- - Avoid sending a garbage value to the controller when a circuit is
- cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
- o Minor bugfixes (tor-fw-helper):
- - Allow tor-fw-helper to build again by adding src/ext to its
- CPPFLAGS. Fixes bug 11296; bugfix on 0.2.5.3-alpha.
- o Minor bugfixes (bridges):
- - Avoid potential crashes or bad behavior when launching a
- server-side managed proxy with ORPort or ExtORPort temporarily
- disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
- o Minor bugfixes (platform-specific):
- - Fix compilation on Solaris, which does not have <endian.h>. Fixes
- bug 11426; bugfix on 0.2.5.3-alpha.
- - When dumping a malformed directory object to disk, save it in
- binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
- 0.2.2.1-alpha.
- - Don't report failures from make_socket_reuseable() on incoming
- sockets on OSX: this can happen when incoming connections close
- early. Fixes bug 10081.
- o Minor bugfixes (trivial memory leaks):
- - Fix a small memory leak when signing a directory object. Fixes bug
- 11275; bugfix on 0.2.4.13-alpha.
- - Free placeholder entries in our circuit table at exit; fixes a
- harmless memory leak. Fixes bug 11278; bugfix on 0.2.5.1-alpha.
- - Don't re-initialize a second set of OpenSSL mutexes when starting
- up. Previously, we'd make one set of mutexes, and then immediately
- replace them with another. Fixes bug 11726; bugfix on
- 0.2.5.3-alpha.
- - Resolve some memory leaks found by coverity in the unit tests, on
- exit in tor-gencert, and on a failure to compute digests for our
- own keys when generating a v3 networkstatus vote. These leaks
- should never have affected anyone in practice.
- o Minor bugfixes (hidden service):
- - Only retry attempts to connect to a chosen rendezvous point 8
- times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (misc code correctness):
- - Fix various instances of undefined behavior in channeltls.c,
- tor_memmem(), and eventdns.c that would cause us to construct
- pointers to memory outside an allocated object. (These invalid
- pointers were not accessed, but C does not even allow them to
- exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
- 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
- - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
- fix some miscellaneous errors in our tests and codebase. Fixes bug
- 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
- - Always check return values for unlink, munmap, UnmapViewOfFile;
- check strftime return values more often. In some cases all we can
- do is report a warning, but this may help prevent deeper bugs from
- going unnoticed. Closes ticket 8787; bugfixes on many, many tor
- versions.
- - Fix numerous warnings from the clang "scan-build" static analyzer.
- Some of these are programming style issues; some of them are false
- positives that indicated awkward code; some are undefined behavior
- cases related to constructing (but not using) invalid pointers;
- some are assumptions about API behavior; some are (harmlessly)
- logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
- correct; and one or two are genuine bugs that weren't reachable
- from the rest of the program. Fixes bug 8793; bugfixes on many,
- many tor versions.
- o Documentation:
- - Build the torify.1 manpage again. Previously, we were only trying
- to build it when also building tor-fw-helper. That's why we didn't
- notice that we'd broken the ability to build it. Fixes bug 11321;
- bugfix on 0.2.5.1-alpha.
- - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
- 11061; bugfix on 0.2.4.7-alpha.
- - Correctly document that we search for a system torrc file before
- looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
- 0.2.3.18-rc.
- - Resolve warnings from Doxygen.
- o Code simplifications and refactoring:
- - Remove is_internal_IP() function. Resolves ticket 4645.
- - Remove unused function circuit_dump_by_chan from circuitlist.c.
- Closes issue 9107; patch from "marek".
- - Change our use of the ENUM_BF macro to avoid declarations that
- confuse Doxygen.
- o Deprecated versions:
- - Tor 0.2.2.x has reached end-of-life; it has received no patches or
- attention for some while. Directory authorities no longer accept
- descriptors from relays running any version of Tor prior to Tor
- 0.2.3.16-alpha. Resolves ticket 11149.
- o Testing:
- - New macros in test.h to simplify writing mock-functions for unit
- tests. Part of ticket 11507. Patch from Dana Koch.
- - Complete tests for the status.c module. Resolves ticket 11507.
- Patch from Dana Koch.
- o Removed code:
- - Remove all code for the long unused v1 directory protocol.
- Resolves ticket 11070.
- Changes in version 0.2.5.3-alpha - 2014-03-22
- Tor 0.2.5.3-alpha includes all the fixes from 0.2.4.21. It contains
- two new anti-DoS features for Tor relays, resolves a bug that kept
- SOCKS5 support for IPv6 from working, fixes several annoying usability
- issues for bridge users, and removes more old code for unused
- directory formats.
- The Tor 0.2.5.x release series is now in patch-freeze: no feature
- patches not already written will be considered for inclusion in 0.2.5.x.
- o Major features (relay security, DoS-resistance):
- - When deciding whether we have run out of memory and we need to
- close circuits, also consider memory allocated in buffers for
- streams attached to each circuit.
- This change, which extends an anti-DoS feature introduced in
- 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
- better resist more memory-based DoS attacks than before. Since the
- MaxMemInCellQueues option now applies to all queues, it is renamed
- to MaxMemInQueues. This feature fixes bug 10169.
- - Avoid hash-flooding denial-of-service attacks by using the secure
- SipHash-2-4 hash function for our hashtables. Without this
- feature, an attacker could degrade performance of a targeted
- client or server by flooding their data structures with a large
- number of entries to be stored at the same hash table position,
- thereby slowing down the Tor instance. With this feature, hash
- table positions are derived from a randomized cryptographic key,
- and an attacker cannot predict which entries will collide. Closes
- ticket 4900.
- - Decrease the lower limit of MaxMemInQueues to 256 MBytes (but leave
- the default at 8GBytes), to better support Raspberry Pi users. Fixes
- bug 9686; bugfix on 0.2.4.14-alpha.
- o Minor features (bridges, pluggable transports):
- - Bridges now write the SHA1 digest of their identity key
- fingerprint (that is, a hash of a hash of their public key) to
- notice-level logs, and to a new hashed-fingerprint file. This
- information will help bridge operators look up their bridge in
- Globe and similar tools. Resolves ticket 10884.
- - Improve the message that Tor displays when running as a bridge
- using pluggable transports without an Extended ORPort listener.
- Also, log the message in the log file too. Resolves ticket 11043.
- o Minor features (other):
- - Add a new option, PredictedPortsRelevanceTime, to control how long
- after having received a request to connect to a given port Tor
- will try to keep circuits ready in anticipation of future requests
- for that port. Patch from "unixninja92"; implements ticket 9176.
- - Generate a warning if any ports are listed in the SocksPolicy,
- DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
- AuthDirBadExit options. (These options only support address
- ranges.) Fixes part of ticket 11108.
- - Update geoip and geoip6 to the February 7 2014 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (new since 0.2.5.2-alpha, also in 0.2.4.21):
- - Build without warnings under clang 3.4. (We have some macros that
- define static functions only some of which will get used later in
- the module. Starting with clang 3.4, these give a warning unless the
- unused attribute is set on them.) Resolves ticket 10904.
- - Fix build warnings about missing "a2x" comment when building the
- manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
- Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
- o Minor bugfixes (client):
- - Improve the log message when we can't connect to a hidden service
- because all of the hidden service directory nodes hosting its
- descriptor are excluded. Improves on our fix for bug 10722, which
- was a bugfix on 0.2.0.10-alpha.
- - Raise a control port warning when we fail to connect to all of
- our bridges. Previously, we didn't inform the controller, and
- the bootstrap process would stall. Fixes bug 11069; bugfix on
- 0.2.1.2-alpha.
- - Exit immediately when a process-owning controller exits.
- Previously, tor relays would wait for a little while after their
- controller exited, as if they had gotten an INT signal -- but this
- was problematic, since there was no feedback for the user. To do a
- clean shutdown, controllers should send an INT signal and give Tor
- a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
- - Stop attempting to connect to bridges before our pluggable
- transports are configured (harmless but resulted in some erroneous
- log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
- - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
- generating incorrect SOCKS5 responses, and confusing client
- applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (relays and bridges):
- - Avoid crashing on a malformed resolv.conf file when running a
- relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
- - Non-exit relays no longer launch mock DNS requests to check for
- DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
- non-exit relays stopped servicing DNS requests. Fixes bug 965;
- bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
- - Bridges now report complete directory request statistics. Related
- to bug 5824; bugfix on 0.2.2.1-alpha.
- - Bridges now never collect statistics that were designed for
- relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
- - Stop giving annoying warning messages when we decide not to launch
- a pluggable transport proxy that we don't need (because there are
- no bridges configured to use it). Resolves ticket 5018; bugfix
- on 0.2.5.2-alpha.
- - Give the correct URL in the warning message when trying to run a
- relay on an ancient version of Windows. Fixes bug 9393.
- o Minor bugfixes (backtrace support):
- - Support automatic backtraces on more platforms by using the
- "-fasynchronous-unwind-tables" compiler option. This option is
- needed for platforms like 32-bit Intel where "-fomit-frame-pointer"
- is on by default and table generation is not. This doesn't yet
- add Windows support; only Linux, OSX, and some BSDs are affected.
- Reported by 'cypherpunks'; fixes bug 11047; bugfix on 0.2.5.2-alpha.
- - Avoid strange behavior if two threads hit failed assertions at the
- same time and both try to log backtraces at once. (Previously, if
- this had happened, both threads would have stored their intermediate
- results in the same buffer, and generated junk outputs.) Reported by
- "cypherpunks". Fixes bug 11048; bugfix on 0.2.5.2-alpha.
- - Fix a compiler warning in format_number_sigsafe(). Bugfix on
- 0.2.5.2-alpha; patch from Nick Hopper.
- o Minor bugfixes (unit tests):
- - Fix a small bug in the unit tests that might have made the tests
- call 'chmod' with an uninitialized bitmask. Fixes bug 10928;
- bugfix on 0.2.5.1-alpha. Patch from Dana Koch.
- o Removed code:
- - Remove all remaining code related to version-0 hidden service
- descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
- the rest of bug 10841.
- o Documentation:
- - Document in the manpage that "KBytes" may also be written as
- "kilobytes" or "KB", that "Kbits" may also be written as
- "kilobits", and so forth. Closes ticket 9222.
- - Document that the ClientOnly config option overrides ORPort.
- Our old explanation made ClientOnly sound as though it did
- nothing at all. Resolves bug 9059.
- - Explain that SocksPolicy, DirPolicy, and similar options don't
- take port arguments. Fixes the other part of ticket 11108.
- - Fix a comment about the rend_server_descriptor_t.protocols field
- to more accurately describe its range. Also, make that field
- unsigned, to more accurately reflect its usage. Fixes bug 9099;
- bugfix on 0.2.1.5-alpha.
- - Fix the manpage's description of HiddenServiceAuthorizeClient:
- the maximum client name length is 16, not 19. Fixes bug 11118;
- bugfix on 0.2.1.6-alpha.
- o Code simplifications and refactoring:
- - Get rid of router->address, since in all cases it was just the
- string representation of router->addr. Resolves ticket 5528.
- o Test infrastructure:
- - Update to the latest version of tinytest.
- - Improve the tinytest implementation of string operation tests so
- that comparisons with NULL strings no longer crash the tests; they
- now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
- Changes in version 0.2.4.21 - 2014-02-28
- Tor 0.2.4.21 further improves security against potential adversaries who
- find breaking 1024-bit crypto doable, and backports several stability
- and robustness patches from the 0.2.5 branch.
- o Major features (client security):
- - When we choose a path for a 3-hop circuit, make sure it contains
- at least one relay that supports the NTor circuit extension
- handshake. Otherwise, there is a chance that we're building
- a circuit that's worth attacking by an adversary who finds
- breaking 1024-bit crypto doable, and that chance changes the game
- theory. Implements ticket 9777.
- o Major bugfixes:
- - Do not treat streams that fail with reason
- END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
- since it could also indicate an ENETUNREACH connection error. Fixes
- part of bug 10777; bugfix on 0.2.4.8-alpha.
- o Code simplification and refactoring:
- - Remove data structures which were introduced to implement the
- CellStatistics option: they are now redundant with the new timestamp
- field in the regular packed_cell_t data structure, which we did
- in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
- o Minor features:
- - Always clear OpenSSL bignums before freeing them -- even bignums
- that don't contain secrets. Resolves ticket 10793. Patch by
- Florent Daigniere.
- - Build without warnings under clang 3.4. (We have some macros that
- define static functions only some of which will get used later in
- the module. Starting with clang 3.4, these give a warning unless the
- unused attribute is set on them.) Resolves ticket 10904.
- - Update geoip and geoip6 files to the February 7 2014 Maxmind
- GeoLite2 Country database.
- o Minor bugfixes:
- - Set the listen() backlog limit to the largest actually supported
- on the system, not to the value in a header file. Fixes bug 9716;
- bugfix on every released Tor.
- - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
- exit node as a NOROUTE error, not an INTERNAL error, since they
- can apparently happen when trying to connect to the wrong sort
- of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
- - Fix build warnings about missing "a2x" comment when building the
- manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
- Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
- - Avoid a segfault on SIGUSR1, where we had freed a connection but did
- not entirely remove it from the connection lists. Fixes bug 9602;
- bugfix on 0.2.4.4-alpha.
- - Fix a segmentation fault in our benchmark code when running with
- Fedora's OpenSSL package, or any other OpenSSL that provides
- ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
- - Turn "circuit handshake stats since last time" log messages into a
- heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
- o Documentation fixes:
- - Document that all but one DirPort entry must have the NoAdvertise
- flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
- Changes in version 0.2.5.2-alpha - 2014-02-13
- Tor 0.2.5.2-alpha includes all the fixes from 0.2.4.18-rc and 0.2.4.20,
- like the "poor random number generation" fix and the "building too many
- circuits" fix. It also further improves security against potential
- adversaries who find breaking 1024-bit crypto doable, and launches
- pluggable transports on demand (which gets us closer to integrating
- pluggable transport support by default -- not to be confused with Tor
- bundles enabling pluggable transports and bridges by default).
- o Major features (client security):
- - When we choose a path for a 3-hop circuit, make sure it contains
- at least one relay that supports the NTor circuit extension
- handshake. Otherwise, there is a chance that we're building
- a circuit that's worth attacking by an adversary who finds
- breaking 1024-bit crypto doable, and that chance changes the game
- theory. Implements ticket 9777.
- - Clients now look at the "usecreatefast" consensus parameter to
- decide whether to use CREATE_FAST or CREATE cells for the first hop
- of their circuit. This approach can improve security on connections
- where Tor's circuit handshake is stronger than the available TLS
- connection security levels, but the tradeoff is more computational
- load on guard relays. Implements proposal 221. Resolves ticket 9386.
- o Major features (bridges):
- - Don't launch pluggable transport proxies if we don't have any
- bridges configured that would use them. Now we can list many
- pluggable transports, and Tor will dynamically start one when it
- hears a bridge address that needs it. Resolves ticket 5018.
- - The bridge directory authority now assigns status flags (Stable,
- Guard, etc) to bridges based on thresholds calculated over all
- Running bridges. Now bridgedb can finally make use of its features
- to e.g. include at least one Stable bridge in its answers. Fixes
- bug 9859.
- o Major features (other):
- - Extend ORCONN controller event to include an "ID" parameter,
- and add four new controller event types CONN_BW, CIRC_BW,
- CELL_STATS, and TB_EMPTY that show connection and circuit usage.
- The new events are emitted in private Tor networks only, with the
- goal of being able to better track performance and load during
- full-network simulations. Implements proposal 218 and ticket 7359.
- - On some platforms (currently: recent OSX versions, glibc-based
- platforms that support the ELF format, and a few other
- Unix-like operating systems), Tor can now dump stack traces
- when a crash occurs or an assertion fails. By default, traces
- are dumped to stderr (if possible) and to any logs that are
- reporting errors. Implements ticket 9299.
- o Major bugfixes:
- - Avoid a segfault on SIGUSR1, where we had freed a connection but did
- not entirely remove it from the connection lists. Fixes bug 9602;
- bugfix on 0.2.4.4-alpha.
- - Do not treat streams that fail with reason
- END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
- since it could also indicate an ENETUNREACH connection error. Fixes
- part of bug 10777; bugfix on 0.2.4.8-alpha.
- o Major bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.20):
- - Do not allow OpenSSL engines to replace the PRNG, even when
- HardwareAccel is set. The only default builtin PRNG engine uses
- the Intel RDRAND instruction to replace the entire PRNG, and
- ignores all attempts to seed it with more entropy. That's
- cryptographically stupid: the right response to a new alleged
- entropy source is never to discard all previously used entropy
- sources. Fixes bug 10402; works around behavior introduced in
- OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
- and "rl1987".
- - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
- address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
- - Avoid launching spurious extra circuits when a stream is pending.
- This fixes a bug where any circuit that _wasn't_ unusable for new
- streams would be treated as if it were, causing extra circuits to
- be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
- o Major bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- - No longer stop reading or writing on cpuworker connections when
- our rate limiting buckets go empty. Now we should handle circuit
- handshake requests more promptly. Resolves bug 9731.
- - Stop trying to bootstrap all our directory information from
- only our first guard. Discovered while fixing bug 9946; bugfix
- on 0.2.4.8-alpha.
- o Minor features (bridges, pluggable transports):
- - Add threshold cutoffs to the networkstatus document created by
- the Bridge Authority. Fixes bug 1117.
- - On Windows, spawn background processes using the CREATE_NO_WINDOW
- flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
- doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
- Vidalia set this option for us.) Implements ticket 10297.
- o Minor features (security):
- - Always clear OpenSSL bignums before freeing them -- even bignums
- that don't contain secrets. Resolves ticket 10793. Patch by
- Florent Daignière.
- o Minor features (config options and command line):
- - Add an --allow-missing-torrc commandline option that tells Tor to
- run even if the configuration file specified by -f is not available.
- Implements ticket 10060.
- - Add support for the TPROXY transparent proxying facility on Linux.
- See documentation for the new TransProxyType option for more
- details. Implementation by "thomo". Closes ticket 10582.
- o Minor features (controller):
- - Add a new "HS_DESC" controller event that reports activities
- related to hidden service descriptors. Resolves ticket 8510.
- - New "DROPGUARDS" controller command to forget all current entry
- guards. Not recommended for ordinary use, since replacing guards
- too frequently makes several attacks easier. Resolves ticket 9934;
- patch from "ra".
- o Minor features (build):
- - Assume that a user using ./configure --host wants to cross-compile,
- and give an error if we cannot find a properly named
- tool-chain. Add a --disable-tool-name-check option to proceed
- nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
- - If we run ./configure and the compiler recognizes -fstack-protector
- but the linker rejects it, warn the user about a potentially missing
- libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
- o Minor features (testing):
- - If Python is installed, "make check" now runs extra tests beyond
- the unit test scripts.
- - When bootstrapping a test network, sometimes very few relays get
- the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
- specify a set of relays which should be voted Guard regardless of
- their uptime or bandwidth. Addresses ticket 9206.
- o Minor features (log messages):
- - When ServerTransportPlugin is set on a bridge, Tor can write more
- useful statistics about bridge use in its extrainfo descriptors,
- but only if the Extended ORPort ("ExtORPort") is set too. Add a
- log message to inform the user in this case. Resolves ticket 9651.
- - When receiving a new controller connection, log the origin address.
- Resolves ticket 9698; patch from "sigpipe".
- - When logging OpenSSL engine status at startup, log the status of
- more engines. Fixes ticket 10043; patch from Joshua Datko.
- - Turn "circuit handshake stats since last time" log messages into a
- heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
- o Minor features (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- - Improve the circuit queue out-of-memory handler. Previously, when
- we ran low on memory, we'd close whichever circuits had the most
- queued cells. Now, we close those that have the *oldest* queued
- cells, on the theory that those are most responsible for us
- running low on memory. Based on analysis from a forthcoming paper
- by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
- - Generate bootstrapping status update events correctly when fetching
- microdescriptors. Fixes bug 9927.
- - Update to the October 2 2013 Maxmind GeoLite Country database.
- o Minor bugfixes (clients):
- - When closing a channel that has already been open, do not close
- pending circuits that were waiting to connect to the same relay.
- Fixes bug 9880; bugfix on 0.2.5.1-alpha. Thanks to skruffy for
- finding this bug.
- o Minor bugfixes (relays):
- - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
- exit node as a NOROUTE error, not an INTERNAL error, since they
- can apparently happen when trying to connect to the wrong sort
- of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (bridges):
- - Fix a bug where the first connection works to a bridge that uses a
- pluggable transport with client-side parameters, but we don't send
- the client-side parameters on subsequent connections. (We don't
- use any pluggable transports with client-side parameters yet,
- but ScrambleSuit will soon become the first one.) Fixes bug 9162;
- bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
- o Minor bugfixes (node selection):
- - If ExcludeNodes is set, consider non-excluded hidden service
- directory servers before excluded ones. Do not consider excluded
- hidden service directory servers at all if StrictNodes is
- set. (Previously, we would sometimes decide to connect to those
- servers, and then realize before we initiated a connection that
- we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
- Reported by "mr-4".
- - If we set the ExitNodes option but it doesn't include any nodes
- that have the Exit flag, we would choose not to bootstrap. Now we
- bootstrap so long as ExitNodes includes nodes which can exit to
- some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (controller and command-line):
- - If changing a config option via "setconf" fails in a recoverable
- way, we used to nonetheless write our new control ports to the
- file described by the "ControlPortWriteToFile" option. Now we only
- write out that file if we successfully switch to the new config
- option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
- - When a command-line option such as --version or --help that
- ordinarily implies --hush appears on the command line along with
- --quiet, then actually obey --quiet. Previously, we obeyed --quiet
- only if it appeared later on the command line. Fixes bug 9578;
- bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (code correctness):
- - Previously we used two temporary files when writing descriptors to
- disk; now we only use one. Fixes bug 1376.
- - Remove an erroneous (but impossible and thus harmless) pointer
- comparison that would have allowed compilers to skip a bounds
- check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
- 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
- - Fix an always-true assertion in pluggable transports code so it
- actually checks what it was trying to check. Fixes bug 10046;
- bugfix on 0.2.3.9-alpha. Found by "dcb".
- o Minor bugfixes (protocol correctness):
- - When receiving a VERSIONS cell with an odd number of bytes, close
- the connection immediately since the cell is malformed. Fixes bug
- 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
- "rl1987".
- o Minor bugfixes (build):
- - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
- turned off (that is, without support for v2 link handshakes). Fixes
- bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
- - Fix compilation warnings and startup issues when running with
- "Sandbox 1" and libseccomp-2.1.0. Fixes bug 10563; bugfix on
- 0.2.5.1-alpha.
- - Fix compilation on Solaris 9, which didn't like us having an
- identifier named "sun". Fixes bug 10565; bugfix in 0.2.5.1-alpha.
- o Minor bugfixes (testing):
- - Fix a segmentation fault in our benchmark code when running with
- Fedora's OpenSSL package, or any other OpenSSL that provides
- ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (log messages):
- - Fix a bug where clients using bridges would report themselves
- as 50% bootstrapped even without a live consensus document.
- Fixes bug 9922; bugfix on 0.2.1.1-alpha.
- - Suppress a warning where, if there's only one directory authority
- in the network, we would complain that votes and signatures cannot
- be uploaded to other directory authorities. Fixes bug 10842;
- bugfix on 0.2.2.26-beta.
- - Report bootstrapping progress correctly when we're downloading
- microdescriptors. We had updated our "do we have enough microdescs
- to begin building circuits?" logic most recently in 0.2.4.10-alpha
- (see bug 5956), but we left the bootstrap status event logic at
- "how far through getting 1/4 of them are we?" Fixes bug 9958;
- bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
- o Minor bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.20):
- - Avoid a crash bug when starting with a corrupted microdescriptor
- cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
- - If we fail to dump a previously cached microdescriptor to disk, avoid
- freeing duplicate data later on. Fixes bug 10423; bugfix on
- 0.2.4.13-alpha. Spotted by "bobnomnom".
- o Minor bugfixes on 0.2.4.x (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- - Correctly log long IPv6 exit policies, instead of truncating them
- or reporting an error. Fixes bug 9596; bugfix on 0.2.4.7-alpha.
- - Our default TLS ecdhe groups were backwards: we meant to be using
- P224 for relays (for performance win) and P256 for bridges (since
- it is more common in the wild). Instead we had it backwards. After
- reconsideration, we decided that the default should be P256 on all
- hosts, since its security is probably better, and since P224 is
- reportedly used quite little in the wild. Found by "skruffy" on
- IRC. Fix for bug 9780; bugfix on 0.2.4.8-alpha.
- - Free directory authority certificate download statuses on exit
- rather than leaking them. Fixes bug 9644; bugfix on 0.2.4.13-alpha.
- o Minor bugfixes on 0.2.3.x (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- - If the guard we choose first doesn't answer, we would try the
- second guard, but once we connected to the second guard we would
- abandon it and retry the first one, slowing down bootstrapping.
- The fix is to treat all our initially chosen guards as acceptable
- to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
- - Fix an assertion failure that would occur when disabling the
- ORPort setting on a running Tor process while accounting was
- enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
- - When examining the list of network interfaces to find our address,
- do not consider non-running or disabled network interfaces. Fixes
- bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
- - Avoid an off-by-one error when checking buffer boundaries when
- formatting the exit status of a pluggable transport helper.
- This is probably not an exploitable bug, but better safe than
- sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
- Pedro Ribeiro.
- o Removed code and features:
- - Clients now reject any directory authority certificates lacking
- a dir-key-crosscert element. These have been included since
- 0.2.1.9-alpha, so there's no real reason for them to be optional
- any longer. Completes proposal 157. Resolves ticket 10162.
- - Remove all code that existed to support the v2 directory system,
- since there are no longer any v2 directory authorities. Resolves
- ticket 10758.
- - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
- options, which were used for designating authorities as "Hidden
- service authorities". There has been no use of hidden service
- authorities since 0.2.2.1-alpha, when we stopped uploading or
- downloading v0 hidden service descriptors. Fixes bug 10881; also
- part of a fix for bug 10841.
- o Code simplification and refactoring:
- - Remove some old fallback code designed to keep Tor clients working
- in a network with only two working relays. Elsewhere in the code we
- have long since stopped supporting such networks, so there wasn't
- much point in keeping it around. Addresses ticket 9926.
- - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
- bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
- - Remove data structures which were introduced to implement the
- CellStatistics option: they are now redundant with the addition
- of a timestamp to the regular packed_cell_t data structure, which
- we did in 0.2.4.18-rc in order to resolve ticket 9093. Implements
- ticket 10870.
- o Documentation (man page) fixes:
- - Update manpage to describe some of the files you can expect to
- find in Tor's DataDirectory. Addresses ticket 9839.
- - Document that all but one DirPort entry must have the NoAdvertise
- flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
- o Documentation fixes (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- - Clarify the usage and risks of setting the ContactInfo torrc line
- for your relay or bridge. Resolves ticket 9854.
- - Add anchors to the manpage so we can link to the html version of
- the documentation for specific options. Resolves ticket 9866.
- - Replace remaining references to DirServer in man page and
- log entries. Resolves ticket 10124.
- o Tool changes:
- - Make the "tor-gencert" tool used by directory authority operators
- create 2048-bit signing keys by default (rather than 1024-bit, since
- 1024-bit is uncomfortably small these days). Addresses ticket 10324.
- Changes in version 0.2.4.20 - 2013-12-22
- Tor 0.2.4.20 fixes potentially poor random number generation for users
- who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
- torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
- and 4) have no state file in their DataDirectory (as would happen on
- first start). Users who generated relay or hidden service identity
- keys in such a situation should discard them and generate new ones.
- This release also fixes a logic error that caused Tor clients to build
- many more preemptive circuits than they actually need.
- o Major bugfixes:
- - Do not allow OpenSSL engines to replace the PRNG, even when
- HardwareAccel is set. The only default builtin PRNG engine uses
- the Intel RDRAND instruction to replace the entire PRNG, and
- ignores all attempts to seed it with more entropy. That's
- cryptographically stupid: the right response to a new alleged
- entropy source is never to discard all previously used entropy
- sources. Fixes bug 10402; works around behavior introduced in
- OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
- and "rl1987".
- - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
- address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
- - Avoid launching spurious extra circuits when a stream is pending.
- This fixes a bug where any circuit that _wasn't_ unusable for new
- streams would be treated as if it were, causing extra circuits to
- be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
- o Minor bugfixes:
- - Avoid a crash bug when starting with a corrupted microdescriptor
- cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
- - If we fail to dump a previously cached microdescriptor to disk, avoid
- freeing duplicate data later on. Fixes bug 10423; bugfix on
- 0.2.4.13-alpha. Spotted by "bobnomnom".
- Changes in version 0.2.4.19 - 2013-12-11
- The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
- (1986-2013). Aaron worked on diverse projects including helping to guide
- Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
- transparency to the U.S government's PACER documents, and contributing
- design and development for Tor and Tor2Web. Aaron was one of the latest
- martyrs in our collective fight for civil liberties and human rights,
- and his death is all the more painful because he was one of us.
- Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
- a new circuit handshake and link encryption that use ECC to provide
- better security and efficiency; makes relays better manage circuit
- creation requests; uses "directory guards" to reduce client enumeration
- risks; makes bridges collect and report statistics about the pluggable
- transports they support; cleans up and improves our geoip database;
- gets much closer to IPv6 support for clients, bridges, and relays; makes
- directory authorities use measured bandwidths rather than advertised
- ones when computing flags and thresholds; disables client-side DNS
- caching to reduce tracking risks; and fixes a big bug in bridge
- reachability testing. This release introduces two new design
- abstractions in the code: a new "channel" abstraction between circuits
- and or_connections to allow for implementing alternate relay-to-relay
- transports, and a new "circuitmux" abstraction storing the queue of
- circuits for a channel. The release also includes many stability,
- security, and privacy fixes.
- Changes in version 0.2.4.18-rc - 2013-11-16
- Tor 0.2.4.18-rc is the fourth release candidate for the Tor 0.2.4.x
- series. It takes a variety of fixes from the 0.2.5.x branch to improve
- stability, performance, and better handling of edge cases.
- o Major features:
- - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
- Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
- 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
- renegotiation from working with TLS 1.1 or 1.2, so we had disabled
- them to solve bug 6033.)
- o Major bugfixes:
- - No longer stop reading or writing on cpuworker connections when
- our rate limiting buckets go empty. Now we should handle circuit
- handshake requests more promptly. Resolves bug 9731.
- - If we are unable to save a microdescriptor to the journal, do not
- drop it from memory and then reattempt downloading it. Fixes bug
- 9645; bugfix on 0.2.2.6-alpha.
- - Stop trying to bootstrap all our directory information from
- only our first guard. Discovered while fixing bug 9946; bugfix
- on 0.2.4.8-alpha.
- - The new channel code sometimes lost track of in-progress circuits,
- causing long-running clients to stop building new circuits. The
- fix is to always call circuit_n_chan_done(chan, 0) from
- channel_closed(). Fixes bug 9776; bugfix on 0.2.4.17-rc.
- o Minor bugfixes (on 0.2.4.x):
- - Correctly log long IPv6 exit policies, instead of truncating them
- or reporting an error. Fixes bug 9596; bugfix on 0.2.4.7-alpha.
- - Our default TLS ecdhe groups were backwards: we meant to be using
- P224 for relays (for performance win) and P256 for bridges (since
- it is more common in the wild). Instead we had it backwards. After
- reconsideration, we decided that the default should be P256 on all
- hosts, since its security is probably better, and since P224 is
- reportedly used quite little in the wild. Found by "skruffy" on
- IRC. Fix for bug 9780; bugfix on 0.2.4.8-alpha.
- - Free directory authority certificate download statuses on exit
- rather than leaking them. Fixes bug 9644; bugfix on 0.2.4.13-alpha.
- o Minor bugfixes (on 0.2.3.x and earlier):
- - If the guard we choose first doesn't answer, we would try the
- second guard, but once we connected to the second guard we would
- abandon it and retry the first one, slowing down bootstrapping.
- The fix is to treat all our initially chosen guards as acceptable
- to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
- - Fix an assertion failure that would occur when disabling the
- ORPort setting on a running Tor process while accounting was
- enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
- - When examining the list of network interfaces to find our address,
- do not consider non-running or disabled network interfaces. Fixes
- bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
- - Avoid an off-by-one error when checking buffer boundaries when
- formatting the exit status of a pluggable transport helper.
- This is probably not an exploitable bug, but better safe than
- sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
- Pedro Ribeiro.
- o Minor features (protecting client timestamps):
- - Clients no longer send timestamps in their NETINFO cells. These were
- not used for anything, and they provided one small way for clients
- to be distinguished from each other as they moved from network to
- network or behind NAT. Implements part of proposal 222.
- - Clients now round timestamps in INTRODUCE cells down to the nearest
- 10 minutes. If a new Support022HiddenServices option is set to 0, or
- if it's set to "auto" and the feature is disabled in the consensus,
- the timestamp is sent as 0 instead. Implements part of proposal 222.
- - Stop sending timestamps in AUTHENTICATE cells. This is not such
- a big deal from a security point of view, but it achieves no actual
- good purpose, and isn't needed. Implements part of proposal 222.
- - Reduce down accuracy of timestamps in hidden service descriptors.
- Implements part of proposal 222.
- o Minor features (other):
- - Improve the circuit queue out-of-memory handler. Previously, when
- we ran low on memory, we'd close whichever circuits had the most
- queued cells. Now, we close those that have the *oldest* queued
- cells, on the theory that those are most responsible for us
- running low on memory. Based on analysis from a forthcoming paper
- by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
- - Generate bootstrapping status update events correctly when fetching
- microdescriptors. Fixes bug 9927.
- - Update to the October 2 2013 Maxmind GeoLite Country database.
- o Documentation fixes:
- - Clarify the usage and risks of setting the ContactInfo torrc line
- for your relay or bridge. Resolves ticket 9854.
- - Add anchors to the manpage so we can link to the html version of
- the documentation for specific options. Resolves ticket 9866.
- - Replace remaining references to DirServer in man page and
- log entries. Resolves ticket 10124.
- Changes in version 0.2.5.1-alpha - 2013-10-02
- Tor 0.2.5.1-alpha introduces experimental support for syscall sandboxing
- on Linux, allows bridges that offer pluggable transports to report usage
- statistics, fixes many issues to make testing easier, and provides
- a pile of minor features and bugfixes that have been waiting for a
- release of the new branch.
- This is the first alpha release in a new series, so expect there to
- be bugs. Users who would rather test out a more stable branch should
- stay with 0.2.4.x for now.
- o Major features (security):
- - Use the seccomp2 syscall filtering facility on Linux to limit
- which system calls Tor can invoke. This is an experimental,
- Linux-only feature to provide defense-in-depth against unknown
- attacks. To try turning it on, set "Sandbox 1" in your torrc
- file. Please be ready to report bugs. We hope to add support
- for better sandboxing in the future, including more fine-grained
- filters, better division of responsibility, and support for more
- platforms. This work has been done by Cristian-Matei Toader for
- Google Summer of Code.
- - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
- Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
- 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
- renegotiation from working with TLS 1.1 or 1.2, so we had disabled
- them to solve bug 6033.)
- o Major features (other):
- - Add support for passing arguments to managed pluggable transport
- proxies. Implements ticket 3594.
- - Bridges now track GeoIP information and the number of their users
- even when pluggable transports are in use, and report usage
- statistics in their extra-info descriptors. Resolves tickets 4773
- and 5040.
- - Make testing Tor networks bootstrap better: lower directory fetch
- retry schedules and maximum interval without directory requests,
- and raise maximum download tries. Implements ticket 6752.
- - Add make target 'test-network' to run tests on a Chutney network.
- Implements ticket 8530.
- - The ntor handshake is now on-by-default, no matter what the
- directory authorities recommend. Implements ticket 8561.
- o Major bugfixes:
- - Instead of writing destroy cells directly to outgoing connection
- buffers, queue them and intersperse them with other outgoing cells.
- This can prevent a set of resource starvation conditions where too
- many pending destroy cells prevent data cells from actually getting
- delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
- bugfix on 0.2.0.1-alpha.
- - If we are unable to save a microdescriptor to the journal, do not
- drop it from memory and then reattempt downloading it. Fixes bug
- 9645; bugfix on 0.2.2.6-alpha.
- - The new channel code sometimes lost track of in-progress circuits,
- causing long-running clients to stop building new circuits. The
- fix is to always call circuit_n_chan_done(chan, 0) from
- channel_closed(). Fixes bug 9776; bugfix on 0.2.4.17-rc.
- o Build features:
- - Tor now builds each source file in two modes: a mode that avoids
- exposing identifiers needlessly, and another mode that exposes
- more identifiers for testing. This lets the compiler do better at
- optimizing the production code, while enabling us to take more
- radical measures to let the unit tests test things.
- - The production builds no longer include functions used only in
- the unit tests; all functions exposed from a module only for
- unit-testing are now static in production builds.
- - Add an --enable-coverage configuration option to make the unit
- tests (and a new src/or/tor-cov target) to build with gcov test
- coverage support.
- o Testing:
- - We now have rudimentary function mocking support that our unit
- tests can use to test functions in isolation. Function mocking
- lets the tests temporarily replace a function's dependencies with
- stub functions, so that the tests can check the function without
- invoking the other functions it calls.
- - Add more unit tests for the <circid,channel>->circuit map, and
- the destroy-cell-tracking code to fix bug 7912.
- - Unit tests for failing cases of the TAP onion handshake.
- - More unit tests for address-manipulation functions.
- o Minor features (protecting client timestamps):
- - Clients no longer send timestamps in their NETINFO cells. These were
- not used for anything, and they provided one small way for clients
- to be distinguished from each other as they moved from network to
- network or behind NAT. Implements part of proposal 222.
- - Clients now round timestamps in INTRODUCE cells down to the nearest
- 10 minutes. If a new Support022HiddenServices option is set to 0, or
- if it's set to "auto" and the feature is disabled in the consensus,
- the timestamp is sent as 0 instead. Implements part of proposal 222.
- - Stop sending timestamps in AUTHENTICATE cells. This is not such
- a big deal from a security point of view, but it achieves no actual
- good purpose, and isn't needed. Implements part of proposal 222.
- - Reduce down accuracy of timestamps in hidden service descriptors.
- Implements part of proposal 222.
- o Minor features (config options):
- - Config (torrc) lines now handle fingerprints which are missing
- their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
- - Support a --dump-config option to print some or all of the
- configured options. Mainly useful for debugging the command-line
- option parsing code. Helps resolve ticket 4647.
- - Raise awareness of safer logging: notify user of potentially
- unsafe config options, like logging more verbosely than severity
- "notice" or setting SafeLogging to 0. Resolves ticket 5584.
- - Add a new configuration option TestingV3AuthVotingStartOffset
- that bootstraps a network faster by changing the timing for
- consensus votes. Addresses ticket 8532.
- - Add a new torrc option "ServerTransportOptions" that allows
- bridge operators to pass configuration parameters to their
- pluggable transports. Resolves ticket 8929.
- - The config (torrc) file now accepts bandwidth and space limits in
- bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
- you can now say "16 kilobits", and so on.) Resolves ticket 9214.
- Patch by CharlieB.
- o Minor features (build):
- - Add support for `--library-versions` flag. Implements ticket 6384.
- - Return the "unexpected sendme" warnings to a warn severity, but make
- them rate limited, to help diagnose ticket 8093.
- - Detect a missing asciidoc, and warn the user about it, during
- configure rather than at build time. Fixes issue 6506. Patch from
- Arlo Breault.
- o Minor features (other):
- - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
- sockets in a single system call. Implements ticket 5129.
- - Log current accounting state (bytes sent and received + remaining
- time for the current accounting period) in the relay's heartbeat
- message. Implements ticket 5526; patch from Peter Retzlaff.
- - Implement the TRANSPORT_LAUNCHED control port event that
- notifies controllers about new launched pluggable
- transports. Resolves ticket 5609.
- - If we're using the pure-C 32-bit curve25519_donna implementation
- of curve25519, build it with the -fomit-frame-pointer option to
- make it go faster on register-starved hosts. This improves our
- handshake performance by about 6% on i386 hosts without nacl.
- Closes ticket 8109.
- - Update to the September 4 2013 Maxmind GeoLite Country database.
- o Minor bugfixes:
- - Set the listen() backlog limit to the largest actually supported
- on the system, not to the value in a header file. Fixes bug 9716;
- bugfix on every released Tor.
- - No longer accept malformed http headers when parsing urls from
- headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
- bugfix on 0.0.6pre1.
- - In munge_extrainfo_into_routerinfo(), check the return value of
- memchr(). This would have been a serious issue if we ever passed
- it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
- from Arlo Breault.
- - On the chance that somebody manages to build Tor on a
- platform where time_t is unsigned, correct the way that
- microdesc_add_to_cache() handles negative time arguments.
- Fixes bug 8042; bugfix on 0.2.3.1-alpha.
- - Reject relative control socket paths and emit a warning. Previously,
- single-component control socket paths would be rejected, but Tor
- would not log why it could not validate the config. Fixes bug 9258;
- bugfix on 0.2.3.16-alpha.
- o Minor bugfixes (command line):
- - Use a single command-line parser for parsing torrc options on the
- command line and for finding special command-line options to avoid
- inconsistent behavior for torrc option arguments that have the same
- names as command-line options. Fixes bugs 4647 and 9578; bugfix on
- 0.0.9pre5.
- - No longer allow 'tor --hash-password' with no arguments. Fixes bug
- 9573; bugfix on 0.0.9pre5.
- o Minor fixes (build, auxiliary programs):
- - Stop preprocessing the "torify" script with autoconf, since
- it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
- from Guilhem.
- - The tor-fw-helper program now follows the standard convention and
- exits with status code "0" on success. Fixes bug 9030; bugfix on
- 0.2.3.1-alpha. Patch by Arlo Breault.
- - Corrected ./configure advice for what openssl dev package you should
- install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
- o Minor code improvements:
- - Remove constants and tests for PKCS1 padding; it's insecure and
- shouldn't be used for anything new. Fixes bug 8792; patch
- from Arlo Breault.
- - Remove instances of strcpy() from the unit tests. They weren't
- hurting anything, since they were only in the unit tests, but it's
- embarrassing to have strcpy() in the code at all, and some analysis
- tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
- 0.2.3.8-alpha. Patch from Arlo Breault.
- o Removed features:
- - Remove migration code from when we renamed the "cached-routers"
- file to "cached-descriptors" back in 0.2.0.8-alpha. This
- incidentally resolves ticket 6502 by cleaning up the related code
- a bit. Patch from Akshay Hebbar.
- o Code simplification and refactoring:
- - Extract the common duplicated code for creating a subdirectory
- of the data directory and writing to a file in it. Fixes ticket
- 4282; patch from Peter Retzlaff.
- - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
- buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
- i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
- - Add a set of accessor functions for the circuit timeout data
- structure. Fixes ticket 6153; patch from "piet".
- - Clean up exit paths from connection_listener_new(). Closes ticket
- 8789. Patch from Arlo Breault.
- - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
- and drop our own custom pkey_eq() implementation. Fixes bug 9043.
- - Use a doubly-linked list to implement the global circuit list.
- Resolves ticket 9108. Patch from Marek Majkowski.
- - Remove contrib/id_to_fp.c since it wasn't used anywhere.
- Changes in version 0.2.4.17-rc - 2013-09-05
- Tor 0.2.4.17-rc is the third release candidate for the Tor 0.2.4.x
- series. It adds an emergency step to help us tolerate the massive
- influx of users: 0.2.4 clients using the new (faster and safer) "NTor"
- circuit-level handshakes now effectively jump the queue compared to
- the 0.2.3 clients using "TAP" handshakes. This release also fixes a
- big bug hindering bridge reachability tests.
- o Major features:
- - Relays now process the new "NTor" circuit-level handshake requests
- with higher priority than the old "TAP" circuit-level handshake
- requests. We still process some TAP requests to not totally starve
- 0.2.3 clients when NTor becomes popular. A new consensus parameter
- "NumNTorsPerTAP" lets us tune the balance later if we need to.
- Implements ticket 9574.
- o Major bugfixes:
- - If the circuit build timeout logic is disabled (via the consensus,
- or because we are an authority), then don't build testing circuits.
- Fixes bug 9657; bugfix on 0.2.2.14-alpha.
- - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
- previously they did not, which prevented them from receiving
- successful connections from relays for self-test or bandwidth
- testing. Also, when a relay is extending a circuit to a bridge,
- it needs to send a NETINFO cell, even when the bridge hasn't sent
- an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
- - If the time to download the next old-style networkstatus is in
- the future, do not decline to consider whether to download the
- next microdescriptor networkstatus. Fixes bug 9564; bugfix on
- 0.2.3.14-alpha.
- o Minor bugfixes:
- - Avoid double-closing the listener socket in our socketpair()
- replacement (used on Windows) in the case where the addresses on
- our opened sockets don't match what we expected. Fixes bug 9400;
- bugfix on 0.0.2pre7. Found by Coverity.
- o Minor fixes (config options):
- - Avoid overflows when the user sets MaxCircuitDirtiness to a
- ridiculously high value, by imposing a (ridiculously high) 30-day
- maximum on MaxCircuitDirtiness.
- - Fix the documentation of HeartbeatPeriod to say that the heartbeat
- message is logged at notice, not at info.
- - Warn and fail if a server is configured not to advertise any
- ORPorts at all. (We need *something* to put in our descriptor,
- or we just won't work.)
- o Minor features:
- - Track how many "TAP" and "NTor" circuit handshake requests we get,
- and how many we complete, and log it every hour to help relay
- operators follow trends in network load. Addresses ticket 9658.
- - Update to the August 7 2013 Maxmind GeoLite Country database.
- Changes in version 0.2.4.16-rc - 2013-08-10
- Tor 0.2.4.16-rc is the second release candidate for the Tor 0.2.4.x
- series. It fixes several crash bugs in the 0.2.4 branch.
- o Major bugfixes:
- - Fix a bug in the voting algorithm that could yield incorrect results
- when a non-naming authority declared too many flags. Fixes bug 9200;
- bugfix on 0.2.0.3-alpha.
- - Fix an uninitialized read that could in some cases lead to a remote
- crash while parsing INTRODUCE2 cells. Bugfix on 0.2.4.1-alpha.
- Anybody running a hidden service on the experimental 0.2.4.x
- branch should upgrade. (This is, so far as we know, unrelated to
- the recent news.)
- - Avoid an assertion failure when processing DNS replies without the
- answer types we expected. Fixes bug 9337; bugfix on 0.2.4.7-alpha.
- - Avoid a crash when using --hash-password. Fixes bug 9295; bugfix on
- 0.2.4.15-rc. Found by stem integration tests.
- o Minor bugfixes:
- - Fix an invalid memory read that occurred when a pluggable
- transport proxy failed its configuration protocol.
- Fixes bug 9288; bugfix on 0.2.4.1-alpha.
- - When evaluating whether to use a connection that we haven't
- decided is canonical using a recent link protocol version,
- decide that it's canonical only if it used address _does_
- match the desired address. Fixes bug 9309; bugfix on
- 0.2.4.4-alpha. Reported by skruffy.
- - Make the default behavior of NumDirectoryGuards be to track
- NumEntryGuards. Now a user who changes only NumEntryGuards will get
- the behavior she expects. Fixes bug 9354; bugfix on 0.2.4.8-alpha.
- - Fix a spurious compilation warning with some older versions of
- GCC on FreeBSD. Fixes bug 9254; bugfix on 0.2.4.14-alpha.
- o Minor features:
- - Update to the July 3 2013 Maxmind GeoLite Country database.
- Changes in version 0.2.4.15-rc - 2013-07-01
- Tor 0.2.4.15-rc is the first release candidate for the Tor 0.2.4.x
- series. It fixes a few smaller bugs, but generally appears stable.
- Please test it and let us know whether it is!
- o Major bugfixes:
- - When receiving a new configuration file via the control port's
- LOADCONF command, do not treat the defaults file as absent.
- Fixes bug 9122; bugfix on 0.2.3.9-alpha.
- o Minor features:
- - Issue a warning when running with the bufferevents backend enabled.
- It's still not stable, and people should know that they're likely
- to hit unexpected problems. Closes ticket 9147.
- Changes in version 0.2.4.14-alpha - 2013-06-18
- Tor 0.2.4.14-alpha fixes a pair of client guard enumeration problems
- present in 0.2.4.13-alpha.
- o Major bugfixes:
- - When we have too much memory queued in circuits (according to a new
- MaxMemInCellQueues option), close the circuits consuming the most
- memory. This prevents us from running out of memory as a relay if
- circuits fill up faster than they can be drained. Fixes bug 9063;
- bugfix on the 54th commit of Tor. This bug is a further fix beyond
- bug 6252, whose fix was merged into 0.2.3.21-rc.
- This change also fixes an earlier approach taken in 0.2.4.13-alpha,
- where we tried to solve this issue simply by imposing an upper limit
- on the number of queued cells for a single circuit. That approach
- proved to be problematic, since there are ways to provoke clients to
- send a number of cells in excess of any such reasonable limit. Fixes
- bug 9072; bugfix on 0.2.4.13-alpha.
- - Limit hidden service descriptors to at most ten introduction
- points, to slow one kind of guard enumeration. Fixes bug 9002;
- bugfix on 0.1.1.11-alpha.
- Changes in version 0.2.4.13-alpha - 2013-06-14
- Tor 0.2.4.13-alpha fixes a variety of potential remote crash
- vulnerabilities, makes socks5 username/password circuit isolation
- actually actually work (this time for sure!), and cleans up a bunch
- of other issues in preparation for a release candidate.
- o Major bugfixes (robustness):
- - Close any circuit that has too many cells queued on it. Fixes
- bug 9063; bugfix on the 54th commit of Tor. This bug is a further
- fix beyond bug 6252, whose fix was merged into 0.2.3.21-rc.
- - Prevent the get_freelists() function from running off the end of
- the list of freelists if it somehow gets an unrecognized
- allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
- eugenis.
- - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
- when an exit connection with optimistic data succeeds immediately
- rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
- 0.2.3.1-alpha.
- - Fix a directory authority crash bug when building a consensus
- using an older consensus as its basis. Fixes bug 8833. Bugfix
- on 0.2.4.12-alpha.
- o Major bugfixes:
- - Avoid a memory leak where we would leak a consensus body when we
- find that a consensus which we couldn't previously verify due to
- missing certificates is now verifiable. Fixes bug 8719; bugfix
- on 0.2.0.10-alpha.
- - We used to always request authority certificates by identity digest,
- meaning we'd get the newest one even when we wanted one with a
- different signing key. Then we would complain about being given
- a certificate we already had, and never get the one we really
- wanted. Now we use the "fp-sk/" resource as well as the "fp/"
- resource to request the one we want. Fixes bug 5595; bugfix on
- 0.2.0.8-alpha.
- - Follow the socks5 protocol when offering username/password
- authentication. The fix for bug 8117 exposed this bug, and it
- turns out real-world applications like Pidgin do care. Bugfix on
- 0.2.3.2-alpha; fixes bug 8879.
- - Prevent failures on Windows Vista and later when rebuilding the
- microdescriptor cache. Diagnosed by Robert Ransom. Fixes bug 8822;
- bugfix on 0.2.4.12-alpha.
- o Minor bugfixes:
- - Fix an impossible buffer overrun in the AES unit tests. Fixes
- bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
- - If for some reason we fail to write a microdescriptor while
- rebuilding the cache, do not let the annotations from that
- microdescriptor linger in the cache file, and do not let the
- microdescriptor stay recorded as present in its old location.
- Fixes bug 9047; bugfix on 0.2.2.6-alpha.
- - Fix a memory leak that would occur whenever a configuration
- option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
- - Paste the description for PathBias parameters from the man
- page into or.h, so the code documents them too. Fixes bug 7982;
- bugfix on 0.2.3.17-beta and 0.2.4.8-alpha.
- - Relays now treat a changed IPv6 ORPort as sufficient reason to
- publish an updated descriptor. Fixes bug 6026; bugfix on
- 0.2.4.1-alpha.
- - When launching a resolve request on behalf of an AF_UNIX control
- socket, omit the address field of the new entry connection, used in
- subsequent controller events, rather than letting tor_dup_addr()
- set it to "<unknown address type>". Fixes bug 8639; bugfix on
- 0.2.4.12-alpha.
- o Minor bugfixes (log messages):
- - Fix a scaling issue in the path bias accounting code that
- resulted in "Bug:" log messages from either
- pathbias_scale_close_rates() or pathbias_count_build_success().
- This represents a bugfix on a previous bugfix: the original fix
- attempted in 0.2.4.10-alpha was incomplete. Fixes bug 8235; bugfix
- on 0.2.4.1-alpha.
- - Give a less useless error message when the user asks for an IPv4
- address on an IPv6-only port, or vice versa. Fixes bug 8846; bugfix
- on 0.2.4.7-alpha.
- o Minor features:
- - Downgrade "unexpected SENDME" warnings to protocol-warn for 0.2.4.x,
- to tolerate bug 8093 for now.
- - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
- in directory authority votes to describe whether they have enough
- measured bandwidths to ignore advertised (relay descriptor)
- bandwidth claims. Resolves ticket 8711.
- - Update to the June 5 2013 Maxmind GeoLite Country database.
- o Removed documentation:
- - Remove some of the older contents of doc/ as obsolete; move others
- to torspec.git. Fixes bug 8965.
- o Code simplification and refactoring:
- - Avoid using character buffers when constructing most directory
- objects: this approach was unwieldy and error-prone. Instead,
- build smartlists of strings, and concatenate them when done.
- Changes in version 0.2.4.12-alpha - 2013-04-18
- Tor 0.2.4.12-alpha moves Tor forward on several fronts: it starts the
- process for lengthening the guard rotation period, makes directory
- authority opinions in the consensus a bit less gameable, makes socks5
- username/password circuit isolation actually work, and fixes a wide
- variety of other issues.
- o Major features:
- - Raise the default time that a client keeps an entry guard from
- "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
- 2012 paper. (We would make it even longer, but we need better client
- load balancing first.) Also, make the guard lifetime controllable
- via a new GuardLifetime torrc option and a GuardLifetime consensus
- parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
- - Directory authorities now prefer using measured bandwidths to
- advertised ones when computing flags and thresholds. Resolves
- ticket 8273.
- - Directory authorities that have more than a threshold number
- of relays with measured bandwidths now treat relays with unmeasured
- bandwidths as having bandwidth 0. Resolves ticket 8435.
- o Major bugfixes (assert / resource use):
- - Avoid a bug where our response to TLS renegotiation under certain
- network conditions could lead to a busy-loop, with 100% CPU
- consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
- - Avoid an assertion when we discover that we'd like to write a cell
- onto a closing connection: just discard the cell. Fixes another
- case of bug 7350; bugfix on 0.2.4.4-alpha.
- o Major bugfixes (client-side privacy):
- - When we mark a circuit as unusable for new circuits, have it
- continue to be unusable for new circuits even if MaxCircuitDirtiness
- is increased too much at the wrong time, or the system clock jumps
- backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
- - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
- which have resolved to internal addresses") is set, apply that
- rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
- - When an exit relay rejects a stream with reason "exit policy", but
- we only know an exit policy summary (e.g. from the microdesc
- consensus) for it, do not mark the relay as useless for all exiting.
- Instead, mark just the circuit as unsuitable for that particular
- address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
- - Allow applications to get proper stream isolation with
- IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
- username/password authentication also offer "no authentication". Tor
- had previously preferred "no authentication", so the applications
- never actually sent Tor their auth details. Now Tor selects
- username/password authentication if it's offered. You can disable
- this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
- bug 8117; bugfix on 0.2.3.3-alpha.
- o Major bugfixes (other):
- - When unable to find any working directory nodes to use as a
- directory guard, give up rather than adding the same non-working
- nodes to the directory guard list over and over. Fixes bug 8231;
- bugfix on 0.2.4.8-alpha.
- o Minor features:
- - Reject as invalid most directory objects containing a NUL.
- Belt-and-suspender fix for bug 8037.
- - In our testsuite, create temporary directories with a bit more
- entropy in their name to make name collisions less likely. Fixes
- bug 8638.
- - Add CACHED keyword to ADDRMAP events in the control protocol
- to indicate whether a DNS result will be cached or not. Resolves
- ticket 8596.
- - Update to the April 3 2013 Maxmind GeoLite Country database.
- o Minor features (build):
- - Detect and reject attempts to build Tor with threading support
- when OpenSSL has been compiled without threading support.
- Fixes bug 6673.
- - Clarify that when autoconf is checking for nacl, it is checking
- specifically for nacl with a fast curve25519 implementation.
- Fixes bug 8014.
- - Warn if building on a platform with an unsigned time_t: there
- are too many places where Tor currently assumes that time_t can
- hold negative values. We'd like to fix them all, but probably
- some will remain.
- o Minor bugfixes (build):
- - Fix some bugs in tor-fw-helper-natpmp when trying to build and
- run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
- Fixes bug 7280; bugfix on 0.2.3.1-alpha.
- - Add the old src/or/micro-revision.i filename to CLEANFILES.
- On the off chance that somebody has one, it will go away as soon
- as they run "make clean". Fix for bug 7143; bugfix on 0.2.4.1-alpha.
- - Build Tor correctly on 32-bit platforms where the compiler can build
- but not run code using the "uint128_t" construction. Fixes bug 8587;
- bugfix on 0.2.4.8-alpha.
- - Fix compilation warning with some versions of clang that would
- prefer the -Wswitch-enum compiler flag to warn about switch
- statements with missing enum values, even if those switch
- statements have a "default:" statement. Fixes bug 8598; bugfix
- on 0.2.4.10-alpha.
- o Minor bugfixes (protocol):
- - Fix the handling of a TRUNCATE cell when it arrives while the
- circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
- - Fix a misframing issue when reading the version numbers in a
- VERSIONS cell. Previously we would recognize [00 01 00 02] as
- 'version 1, version 2, and version 0x100', when it should have
- only included versions 1 and 2. Fixes bug 8059; bugfix on
- 0.2.0.10-alpha. Reported pseudonymously.
- - Make the format and order of STREAM events for DNS lookups
- consistent among the various ways to launch DNS lookups. Fixes
- bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
- - Correct our check for which versions of Tor support the EXTEND2
- cell. We had been willing to send it to Tor 0.2.4.7-alpha and
- later, when support was really added in version 0.2.4.8-alpha.
- Fixes bug 8464; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (other):
- - Correctly store microdescriptors and extrainfo descriptors with
- an internal NUL byte. Fixes bug 8037; bugfix on 0.2.0.1-alpha.
- Bug reported by "cypherpunks".
- - Increase the width of the field used to remember a connection's
- link protocol version to two bytes. Harmless for now, since the
- only currently recognized versions are one byte long. Reported
- pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
- - If the state file's path bias counts are invalid (presumably from a
- buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
- additional checks and log messages to the scaling of Path Bias
- counts, in case there still are remaining issues with scaling.
- Should help resolve bug 8235.
- - Eliminate several instances where we use "Nickname=ID" to refer to
- nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
- "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
- on 0.2.3.21-rc, 0.2.4.5-alpha, 0.2.4.8-alpha, and 0.2.4.10-alpha.
- o Minor bugfixes (syscalls):
- - Always check the return values of functions fcntl() and
- setsockopt(). We don't believe these are ever actually failing in
- practice, but better safe than sorry. Also, checking these return
- values should please analysis tools like Coverity. Patch from
- 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
- - Use direct writes rather than stdio when building microdescriptor
- caches, in an attempt to mitigate bug 8031, or at least make it
- less common.
- o Minor bugfixes (config):
- - When rejecting a configuration because we were unable to parse a
- quoted string, log an actual error message. Fixes bug 7950; bugfix
- on 0.2.0.16-alpha.
- - Behave correctly when the user disables LearnCircuitBuildTimeout
- but doesn't tell us what they would like the timeout to be. Fixes
- bug 6304; bugfix on 0.2.2.14-alpha.
- - When autodetecting the number of CPUs, use the number of available
- CPUs in preference to the number of configured CPUs. Inform the
- user if this reduces the number of available CPUs. Fixes bug 8002;
- bugfix on 0.2.3.1-alpha.
- - Make it an error when you set EntryNodes but disable UseGuardNodes,
- since it will (surprisingly to some users) ignore EntryNodes. Fixes
- bug 8180; bugfix on 0.2.3.11-alpha.
- - Allow TestingTorNetworks to override the 4096-byte minimum for
- the Fast threshold. Otherwise they can't bootstrap until they've
- observed more traffic. Fixes bug 8508; bugfix on 0.2.4.10-alpha.
- - Fix some logic errors when the user manually overrides the
- PathsNeededToBuildCircuits option in torrc. Fixes bug 8599; bugfix
- on 0.2.4.10-alpha.
- o Minor bugfixes (log messages to help diagnose bugs):
- - If we fail to free a microdescriptor because of bug 7164, log
- the filename and line number from which we tried to free it.
- - Add another diagnostic to the heartbeat message: track and log
- overhead that TLS is adding to the data we write. If this is
- high, we are sending too little data to SSL_write at a time.
- Diagnostic for bug 7707.
- - Add more detail to a log message about relaxed timeouts, to help
- track bug 7799.
- - Warn more aggressively when flushing microdescriptors to a
- microdescriptor cache fails, in an attempt to mitigate bug 8031,
- or at least make it more diagnosable.
- - Improve debugging output to help track down bug 8185 ("Bug:
- outgoing relay cell has n_chan==NULL. Dropping.")
- - Log the purpose of a path-bias testing circuit correctly.
- Improves a log message from bug 8477; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (0.2.4.x log messages that were too noisy):
- - Don't attempt to relax the timeout of already opened 1-hop circuits.
- They might never timeout. This should eliminate some/all cases of
- the relaxed timeout log message.
- - Use circuit creation time for network liveness evaluation. This
- should eliminate warning log messages about liveness caused
- by changes in timeout evaluation. Fixes bug 6572; bugfix on
- 0.2.4.8-alpha.
- - Reduce a path bias length check from notice to info. The message
- is triggered when creating controller circuits. Fixes bug 8196;
- bugfix on 0.2.4.8-alpha.
- - Fix a path state issue that triggered a notice during relay startup.
- Fixes bug 8320; bugfix on 0.2.4.10-alpha.
- - Reduce occurrences of warns about circuit purpose in
- connection_ap_expire_building(). Fixes bug 8477; bugfix on
- 0.2.4.11-alpha.
- o Minor bugfixes (pre-0.2.4.x log messages that were too noisy):
- - If we encounter a write failure on a SOCKS connection before we
- finish our SOCKS handshake, don't warn that we closed the
- connection before we could send a SOCKS reply. Fixes bug 8427;
- bugfix on 0.1.0.1-rc.
- - Correctly recognize that [::1] is a loopback address. Fixes
- bug 8377; bugfix on 0.2.1.3-alpha.
- - Fix a directory authority warn caused when we have a large amount
- of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
- - Don't log inappropriate heartbeat messages when hibernating: a
- hibernating node is _expected_ to drop out of the consensus,
- decide it isn't bootstrapped, and so forth. Fixes bug 7302;
- bugfix on 0.2.3.1-alpha.
- - Don't complain about bootstrapping problems while hibernating.
- These complaints reflect a general code problem, but not one
- with any problematic effects (no connections are actually
- opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
- o Documentation fixes:
- - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
- names match. Fixes bug 7768.
- - Make the torify manpage no longer refer to tsocks; torify hasn't
- supported tsocks since 0.2.3.14-alpha.
- - Make the tor manpage no longer reference tsocks.
- - Fix the GeoIPExcludeUnknown documentation to refer to
- ExcludeExitNodes rather than the currently nonexistent
- ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
- o Removed files:
- - The tor-tsocks.conf is no longer distributed or installed. We
- recommend that tsocks users use torsocks instead. Resolves
- ticket 8290.
- Changes in version 0.2.4.11-alpha - 2013-03-11
- Tor 0.2.4.11-alpha makes relay measurement by directory authorities
- more robust, makes hidden service authentication work again, and
- resolves a DPI fingerprint for Tor's SSL transport.
- o Major features (directory authorities):
- - Directory authorities now support a new consensus method (17)
- where they cap the published bandwidth of servers for which
- insufficient bandwidth measurements exist. Fixes part of bug 2286.
- - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
- serve any v2 directory information. Now we can test disabling the
- old deprecated v2 directory format, and see whether doing so has
- any effect on network load. Begins to fix bug 6783.
- - Directory authorities now include inside each vote a statement of
- the performance thresholds they used when assigning flags.
- Implements ticket 8151.
- o Major bugfixes (directory authorities):
- - Stop marking every relay as having been down for one hour every
- time we restart a directory authority. These artificial downtimes
- were messing with our Stable and Guard flag calculations. Fixes
- bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
- o Major bugfixes (hidden services):
- - Allow hidden service authentication to succeed again. When we
- refactored the hidden service introduction code back
- in 0.2.4.1-alpha, we didn't update the code that checks
- whether authentication information is present, causing all
- authentication checks to return "false". Fix for bug 8207; bugfix
- on 0.2.4.1-alpha. Found by Coverity; this is CID 718615.
- o Minor features (relays, bridges):
- - Make bridge relays check once a minute for whether their IP
- address has changed, rather than only every 15 minutes. Resolves
- bugs 1913 and 1992.
- - Refactor resolve_my_address() so it returns the method by which we
- decided our public IP address (explicitly configured, resolved from
- explicit hostname, guessed from interfaces, learned by gethostname).
- Now we can provide more helpful log messages when a relay guesses
- its IP address incorrectly (e.g. due to unexpected lines in
- /etc/hosts). Resolves ticket 2267.
- - Teach bridge-using clients to avoid 0.2.2 bridges when making
- microdescriptor-related dir requests, and only fall back to normal
- descriptors if none of their bridges can handle microdescriptors
- (as opposed to the fix in ticket 4013, which caused them to fall
- back to normal descriptors if *any* of their bridges preferred
- them). Resolves ticket 4994.
- - Randomize the lifetime of our SSL link certificate, so censors can't
- use the static value for filtering Tor flows. Resolves ticket 8443;
- related to ticket 4014 which was included in 0.2.2.33.
- - Support a new version of the link protocol that allows 4-byte circuit
- IDs. Previously, circuit IDs were limited to 2 bytes, which presented
- a possible resource exhaustion issue. Closes ticket 7351; implements
- proposal 214.
- o Minor features (portability):
- - Tweak the curve25519-donna*.c implementations to tolerate systems
- that lack stdint.h. Fixes bug 3894; bugfix on 0.2.4.8-alpha.
- - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
- the signs of types during autoconf. This is better than our old
- approach, which didn't work when cross-compiling.
- - Detect the sign of enum values, rather than assuming that MSC is the
- only compiler where enum types are all signed. Fixes bug 7727;
- bugfix on 0.2.4.10-alpha.
- o Minor features (other):
- - Say "KBytes" rather than "KB" in the man page (for various values
- of K), to further reduce confusion about whether Tor counts in
- units of memory or fractions of units of memory. Resolves ticket 7054.
- - Clear the high bit on curve25519 public keys before passing them to
- our backend, in case we ever wind up using a backend that doesn't do
- so itself. If we used such a backend, and *didn't* clear the high bit,
- we could wind up in a situation where users with such backends would
- be distinguishable from users without. Fixes bug 8121; bugfix on
- 0.2.4.8-alpha.
- - Update to the March 6 2013 Maxmind GeoLite Country database.
- o Minor bugfixes (clients):
- - When we receive a RELAY_END cell with the reason DONE, or with no
- reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
- status as "connection refused". Previously we reported these cases
- as success but then immediately closed the connection. Fixes bug
- 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
- - Downgrade an assertion in connection_ap_expire_beginning to an
- LD_BUG message. The fix for bug 8024 should prevent this message
- from displaying, but just in case, a warn that we can diagnose
- is better than more assert crashes. Fixes bug 8065; bugfix on
- 0.2.4.8-alpha.
- - Lower path use bias thresholds to .80 for notice and .60 for warn.
- Also make the rate limiting flags for the path use bias log messages
- independent from the original path bias flags. Fixes bug 8161;
- bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (relays):
- - Stop trying to resolve our hostname so often (e.g. every time we
- think about doing a directory fetch). Now we reuse the cached
- answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
- and 2410 (bugfix on 0.1.2.2-alpha).
- - Stop sending a stray "(null)" in some cases for the server status
- "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
- on 0.1.2.6-alpha.
- - When choosing which stream on a formerly stalled circuit to wake
- first, make better use of the platform's weak RNG. Previously,
- we had been using the % ("modulo") operator to try to generate a
- 1/N chance of picking each stream, but this behaves badly with
- many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
- 0.2.2.20-alpha.
- - Use our own weak RNG when we need a weak RNG. Windows's rand() and
- Irix's random() only return 15 bits; Solaris's random() returns more
- bits but its RAND_MAX says it only returns 15, and so on. Motivated
- by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
- o Minor bugfixes (directory authorities):
- - Directory authorities now use less space when formatting identical
- microdescriptor lines in directory votes. Fixes bug 8158; bugfix
- on 0.2.4.1-alpha.
- o Minor bugfixes (memory leaks spotted by Coverity -- bug 7816):
- - Avoid leaking memory if we fail to compute a consensus signature
- or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
- - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
- on 0.2.1.1-alpha.
- - Fix a memory leak during safe-cookie controller authentication.
- Bugfix on 0.2.3.13-alpha.
- - Avoid memory leak of IPv6 policy content if we fail to format it into
- a router descriptor. Bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (other code correctness issues):
- - Avoid a crash if we fail to generate an extrainfo descriptor.
- Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
- this is CID 718634.
- - When detecting the largest possible file descriptor (in order to
- close all file descriptors when launching a new program), actually
- use _SC_OPEN_MAX. The old code for doing this was very, very broken.
- Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
- is CID 743383.
- - Fix a copy-and-paste error when adding a missing A1 to a routerset
- because of GeoIPExcludeUnknown. Fix for Coverity CID 980650.
- Bugfix on 0.2.4.10-alpha.
- - Fix an impossible-to-trigger integer overflow when estimating how
- long our onionskin queue would take. (This overflow would require us
- to accept 4 million onionskins before processing 100 of them.) Fixes
- bug 8210; bugfix on 0.2.4.10-alpha.
- o Code simplification and refactoring:
- - Add a wrapper function for the common "log a message with a
- rate-limit" case.
- Changes in version 0.2.4.10-alpha - 2013-02-04
- Tor 0.2.4.10-alpha adds defenses at the directory authority level from
- certain attacks that flood the network with relays; changes the queue
- for circuit create requests from a sized-based limit to a time-based
- limit; resumes building with MSVC on Windows; and fixes a wide variety
- of other issues.
- o Major bugfixes (directory authority):
- - When computing directory thresholds, ignore any rejected-as-sybil
- nodes during the computation so that they can't influence Fast,
- Guard, etc. (We should have done this for proposal 109.) Fixes
- bug 8146.
- - When marking a node as a likely sybil, reset its uptime metrics
- to zero, so that it cannot time towards getting marked as Guard,
- Stable, or HSDir. (We should have done this for proposal 109.) Fixes
- bug 8147.
- o Major bugfixes:
- - When a TLS write is partially successful but incomplete, remember
- that the flushed part has been flushed, and notice that bytes were
- actually written. Reported and fixed pseudonymously. Fixes bug
- 7708; bugfix on Tor 0.1.0.5-rc.
- - Reject bogus create and relay cells with 0 circuit ID or 0 stream
- ID: these could be used to create unexpected streams and circuits
- which would count as "present" to some parts of Tor but "absent"
- to others, leading to zombie circuits and streams or to a bandwidth
- denial-of-service. Fixes bug 7889; bugfix on every released version
- of Tor. Reported by "oftc_must_be_destroyed".
- - Rename all macros in our local copy of queue.h to begin with "TOR_".
- This change seems the only good way to permanently prevent conflicts
- with queue.h on various operating systems. Fixes bug 8107; bugfix
- on 0.2.4.6-alpha.
- o Major features (relay):
- - Instead of limiting the number of queued onionskins (aka circuit
- create requests) to a fixed, hard-to-configure number, we limit
- the size of the queue based on how many we expect to be able to
- process in a given amount of time. We estimate the time it will
- take to process an onionskin based on average processing time
- of previous onionskins. Closes ticket 7291. You'll never have to
- configure MaxOnionsPending again.
- o Major features (portability):
- - Resume building correctly with MSVC and Makefile.nmake. This patch
- resolves numerous bugs and fixes reported by ultramage, including
- 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
- - Make the ntor and curve25519 code build correctly with MSVC.
- Fix on 0.2.4.8-alpha.
- o Minor features:
- - When directory authorities are computing thresholds for flags,
- never let the threshold for the Fast flag fall below 4096
- bytes. Also, do not consider nodes with extremely low bandwidths
- when deciding thresholds for various directory flags. This change
- should raise our threshold for Fast relays, possibly in turn
- improving overall network performance; see ticket 1854. Resolves
- ticket 8145.
- - The Tor client now ignores sub-domain components of a .onion
- address. This change makes HTTP "virtual" hosting
- possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
- http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
- hosted on the same hidden service. Implements proposal 204.
- - We compute the overhead from passing onionskins back and forth to
- cpuworkers, and report it when dumping statistics in response to
- SIGUSR1. Supports ticket 7291.
- o Minor features (path selection):
- - When deciding whether we have enough descriptors to build circuits,
- instead of looking at raw relay counts, look at which fraction
- of (bandwidth-weighted) paths we're able to build. This approach
- keeps clients from building circuits if their paths are likely to
- stand out statistically. The default fraction of paths needed is
- taken from the consensus directory; you can override it with the
- new PathsNeededToBuildCircuits option. Fixes ticket 5956.
- - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
- and we have GeoIP information, also exclude all nodes with unknown
- countries "??" and "A1". This behavior is controlled by the
- new GeoIPExcludeUnknown option: you can make such nodes always
- excluded with "GeoIPExcludeUnknown 1", and disable the feature
- with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
- gets you the default behavior. Implements feature 7706.
- - Path Use Bias: Perform separate accounting for successful circuit
- use. Keep separate statistics on stream attempt rates versus stream
- success rates for each guard. Provide configurable thresholds to
- determine when to emit log messages or disable use of guards that
- fail too many stream attempts. Resolves ticket 7802.
- o Minor features (log messages):
- - When learning a fingerprint for a bridge, log its corresponding
- transport type. Implements ticket 7896.
- - Improve the log message when "Bug/attack: unexpected sendme cell
- from client" occurs, to help us track bug 8093.
- o Minor bugfixes:
- - Remove a couple of extraneous semicolons that were upsetting the
- cparser library. Patch by Christian Grothoff. Fixes bug 7115;
- bugfix on 0.2.2.1-alpha.
- - Remove a source of rounding error during path bias count scaling;
- don't count cannibalized circuits as used for path bias until we
- actually try to use them; and fix a circuit_package_relay_cell()
- warning message about n_chan==NULL. Fixes bug 7802.
- - Detect nacl when its headers are in a nacl/ subdirectory. Also,
- actually link against nacl when we're configured to use it. Fixes
- bug 7972; bugfix on 0.2.4.8-alpha.
- - Compile correctly with the --disable-curve25519 option. Fixes
- bug 8153; bugfix on 0.2.4.8-alpha.
- o Build improvements:
- - Do not report status verbosely from autogen.sh unless the -v flag
- is specified. Fixes issue 4664. Patch from Onizuka.
- - Replace all calls to snprintf() outside of src/ext with
- tor_snprintf(). Also remove the #define to replace snprintf with
- _snprintf on Windows; they have different semantics, and all of
- our callers should be using tor_snprintf() anyway. Fixes bug 7304.
- - Try to detect if we are ever building on a platform where
- memset(...,0,...) does not set the value of a double to 0.0. Such
- platforms are permitted by the C standard, though in practice
- they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
- currently support them, but it's better to detect them and fail
- than to perform erroneously.
- o Removed features:
- - Stop exporting estimates of v2 and v3 directory traffic shares
- in extrainfo documents. They were unneeded and sometimes inaccurate.
- Also stop exporting any v2 directory request statistics. Resolves
- ticket 5823.
- - Drop support for detecting and warning about versions of Libevent
- before 1.3e. Nothing reasonable ships with them any longer;
- warning the user about them shouldn't be needed. Resolves ticket
- 6826.
- o Code simplifications and refactoring:
- - Rename "isin" functions to "contains", for grammar. Resolves
- ticket 5285.
- - Rename Tor's logging function log() to tor_log(), to avoid conflicts
- with the natural logarithm function from the system libm. Resolves
- ticket 7599.
- Changes in version 0.2.4.9-alpha - 2013-01-15
- Tor 0.2.4.9-alpha provides a quick fix to make the new ntor handshake
- work more robustly.
- o Major bugfixes:
- - Fix backward compatibility logic when receiving an embedded ntor
- handshake tunneled in a CREATE cell. This clears up the "Bug:
- couldn't format CREATED cell" warning. Fixes bug 7959; bugfix
- on 0.2.4.8-alpha.
- Changes in version 0.2.4.8-alpha - 2013-01-14
- Tor 0.2.4.8-alpha introduces directory guards to reduce user enumeration
- risks, adds a new stronger and faster circuit handshake, and offers
- stronger and faster link encryption when both sides support it.
- o Major features:
- - Preliminary support for directory guards (proposal 207): when
- possible, clients now use their entry guards for non-anonymous
- directory requests. This can help prevent client enumeration. Note
- that this behavior only works when we have a usable consensus
- directory, and when options about what to download are more or less
- standard. In the future we should re-bootstrap from our guards,
- rather than re-bootstrapping from the preconfigured list of
- directory sources that ships with Tor. Resolves ticket 6526.
- - Tor relays and clients now support a better CREATE/EXTEND cell
- format, allowing the sender to specify multiple address, identity,
- and handshake types. Implements Robert Ransom's proposal 200;
- closes ticket 7199.
- o Major features (new circuit handshake):
- - Tor now supports a new circuit extension handshake designed by Ian
- Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
- circuit extension handshake, later called "TAP", was a bit slow
- (especially on the relay side), had a fragile security proof, and
- used weaker keys than we'd now prefer. The new circuit handshake
- uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
- function, making it significantly more secure than the older
- handshake, and significantly faster. Tor can use one of two built-in
- pure-C curve25519-donna implementations by Adam Langley, or it
- can link against the "nacl" library for a tuned version if present.
- The built-in version is very fast for 64-bit systems when building
- with GCC. The built-in 32-bit version is still faster than the
- old TAP protocol, but using libnacl is better on most such hosts.
- Clients don't currently use this protocol by default, since
- comparatively few clients support it so far. To try it, set
- UseNTorHandshake to 1.
- Implements proposal 216; closes ticket 7202.
- o Major features (better link encryption):
- - Relays can now enable the ECDHE TLS ciphersuites when available
- and appropriate. These ciphersuites let us negotiate forward-secure
- TLS secret keys more safely and more efficiently than with our
- previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
- public relays prefer the (faster) P224 group, and bridges prefer
- the (more common) P256 group; you can override this with the
- TLSECGroup option.
- Enabling these ciphers was a little tricky, since for a long time,
- clients had been claiming to support them without actually doing
- so, in order to foil fingerprinting. But with the client-side
- implementation of proposal 198 in 0.2.3.17-beta, clients can now
- match the ciphers from recent Firefox versions *and* list the
- ciphers they actually mean, so relays can believe such clients
- when they advertise ECDHE support in their TLS ClientHello messages.
- This feature requires clients running 0.2.3.17-beta or later,
- and requires both sides to be running OpenSSL 1.0.0 or later
- with ECC support. OpenSSL 1.0.1, with the compile-time option
- "enable-ec_nistp_64_gcc_128", is highly recommended.
- Implements the relay side of proposal 198; closes ticket 7200.
- o Major bugfixes:
- - Avoid crashing when, as a relay without IPv6-exit support, a
- client insists on getting an IPv6 address or nothing. Fixes bug
- 7814; bugfix on 0.2.4.7-alpha.
- o Minor features:
- - Improve circuit build timeout handling for hidden services.
- In particular: adjust build timeouts more accurately depending
- upon the number of hop-RTTs that a particular circuit type
- undergoes. Additionally, launch intro circuits in parallel
- if they timeout, and take the first one to reply as valid.
- - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
- separate error codes; or at least, don't break for that reason.
- Fixes bug 7935. Reported by "oftc_must_be_destroyed".
- - Update to the January 2 2013 Maxmind GeoLite Country database.
- o Minor features (testing):
- - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
- (P-256) Diffie-Hellman handshakes to src/or/bench.
- - Add benchmark functions to test onion handshake performance.
- o Minor features (path bias detection):
- - Alter the Path Bias log messages to be more descriptive in terms
- of reporting timeouts and other statistics.
- - Create three levels of Path Bias log messages, as opposed to just
- two. These are configurable via consensus as well as via the torrc
- options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
- The default values are 0.70, 0.50, and 0.30 respectively.
- - Separate the log message levels from the decision to drop guards,
- which also is available via torrc option PathBiasDropGuards.
- PathBiasDropGuards still defaults to 0 (off).
- - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
- in combination with PathBiasExtremeRate.
- - Increase the default values for PathBiasScaleThreshold and
- PathBiasCircThreshold from (200, 20) to (300, 150).
- - Add in circuit usage accounting to path bias. If we try to use a
- built circuit but fail for any reason, it counts as path bias.
- Certain classes of circuits where the adversary gets to pick your
- destination node are exempt from this accounting. Usage accounting
- can be specifically disabled via consensus parameter or torrc.
- - Convert all internal path bias state to double-precision floating
- point, to avoid roundoff error and other issues.
- - Only record path bias information for circuits that have completed
- *two* hops. Assuming end-to-end tagging is the attack vector, this
- makes us more resilient to ambient circuit failure without any
- detection capability loss.
- o Minor bugfixes (log messages):
- - Rate-limit the "No circuits are opened. Relaxed timeout for a
- circuit with channel state open..." message to once per hour to
- keep it from filling the notice logs. Mitigates bug 7799 but does
- not fix the underlying cause. Bugfix on 0.2.4.7-alpha.
- - Avoid spurious warnings when configuring multiple client ports of
- which only some are nonlocal. Previously, we had claimed that some
- were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
- 0.2.3.3-alpha.
- o Code simplifications and refactoring:
- - Get rid of a couple of harmless clang warnings, where we compared
- enums to ints. These warnings are newly introduced in clang 3.2.
- - Split the onion.c file into separate modules for the onion queue
- and the different handshakes it supports.
- - Remove the marshalling/unmarshalling code for sending requests to
- cpuworkers over a socket, and instead just send structs. The
- recipient will always be the same Tor binary as the sender, so
- any encoding is overkill.
- Changes in version 0.2.4.7-alpha - 2012-12-24
- Tor 0.2.4.7-alpha introduces a new approach to providing fallback
- directory mirrors for more robust bootstrapping; fixes more issues where
- clients with changing network conditions refuse to make any circuits;
- adds initial support for exiting to IPv6 addresses; resumes being able
- to update our GeoIP database, and includes the geoip6 file this time;
- turns off the client-side DNS cache by default due to privacy risks;
- and fixes a variety of other issues.
- o Major features (client resilience):
- - Add a new "FallbackDir" torrc option to use when we can't use
- a directory mirror from the consensus (either because we lack a
- consensus, or because they're all down). Currently, all authorities
- are fallbacks by default, and there are no other default fallbacks,
- but that will change. This option will allow us to give clients a
- longer list of servers to try to get a consensus from when first
- connecting to the Tor network, and thereby reduce load on the
- directory authorities. Implements proposal 206, "Preconfigured
- directory sources for bootstrapping". We also removed the old
- "FallbackNetworkstatus" option, since we never got it working well
- enough to use it. Closes bug 572.
- - If we have no circuits open, use a relaxed timeout (the
- 95-percentile cutoff) until a circuit succeeds. This heuristic
- should allow Tor to succeed at building circuits even when the
- network connection drastically changes. Should help with bug 3443.
- o Major features (IPv6):
- - Relays can now exit to IPv6 addresses: make sure that you have IPv6
- connectivity, then set the IPv6Exit flag to 1. Also make sure your
- exit policy reads as you would like: the address * applies to all
- address families, whereas *4 is IPv4 address only, and *6 is IPv6
- addresses only. On the client side, you'll need to wait until the
- authorities have upgraded, wait for enough exits to support IPv6,
- apply the "IPv6Traffic" flag to a SocksPort, and use Socks5. Closes
- ticket 5547, implements proposal 117 as revised in proposal 208.
- We DO NOT recommend that clients with actual anonymity needs start
- using IPv6 over Tor yet, since not enough exits support it yet.
- o Major features (geoip database):
- - Maxmind began labelling Tor relays as being in country "A1",
- which breaks by-country node selection inside Tor. Now we use a
- script to replace "A1" ("Anonymous Proxy") entries in our geoip
- file with real country codes. This script fixes about 90% of "A1"
- entries automatically and uses manual country code assignments to
- fix the remaining 10%. See src/config/README.geoip for details.
- Fixes bug 6266. Also update to the December 5 2012 Maxmind GeoLite
- Country database, as modified above.
- o Major bugfixes (client-side DNS):
- - Turn off the client-side DNS cache by default. Updating and using
- the DNS cache is now configurable on a per-client-port
- level. SOCKSPort, DNSPort, etc lines may now contain
- {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
- cache these types of DNS answers when we receive them from an
- exit node in response to an application request on this port, and
- {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
- cached DNS answers of these types, we shouldn't use them. It's
- potentially risky to use cached DNS answers at the client, since
- doing so can indicate to one exit what answers we've gotten
- for DNS lookups in the past. With IPv6, this becomes especially
- problematic. Using cached DNS answers for requests on the same
- circuit would present less linkability risk, since all traffic
- on a circuit is already linkable, but it would also provide
- little performance benefit: the exit node caches DNS replies
- too. Implements a simplified version of Proposal 205. Implements
- ticket 7570.
- o Major bugfixes (other):
- - Alter circuit build timeout measurement to start at the point
- where we begin the CREATE/CREATE_FAST step (as opposed to circuit
- initialization). This should make our timeout measurements more
- uniform. Previously, we were sometimes including ORconn setup time
- in our circuit build time measurements. Should resolve bug 3443.
- - Fix an assertion that could trigger in hibernate_go_dormant() when
- closing an or_connection_t: call channel_mark_for_close() rather
- than connection_mark_for_close(). Fixes bug 7267. Bugfix on
- 0.2.4.4-alpha.
- - Include the geoip6 IPv6 GeoIP database in the tarball. Fixes bug
- 7655; bugfix on 0.2.4.6-alpha.
- o Minor features:
- - Add a new torrc option "ServerTransportListenAddr" to let bridge
- operators select the address where their pluggable transports will
- listen for connections. Resolves ticket 7013.
- - Allow an optional $ before the node identity digest in the
- controller command GETINFO ns/id/<identity>, for consistency with
- md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
- - Log packaged cell fullness as part of the heartbeat message.
- Diagnosis to try to determine the extent of bug 7743.
- o Minor features (IPv6):
- - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
- prefer to hand out virtual IPv6 addresses, since there are more of
- them and we can't run out. To override this behavior and make IPv4
- addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
- or DNSPort you're using for resolving. Implements ticket 7571.
- - AutomapHostsOnResolve responses are now randomized, to avoid
- annoying situations where Tor is restarted and applications
- connect to the wrong addresses.
- - Never try more than 1000 times to pick a new virtual address when
- AutomapHostsOnResolve is set. That's good enough so long as we
- aren't close to handing out our entire virtual address space;
- if you're getting there, it's best to switch to IPv6 virtual
- addresses anyway.
- o Minor bugfixes:
- - The ADDRMAP command can no longer generate an ill-formed error
- code on a failed MAPADDRESS. It now says "internal" rather than
- an English sentence fragment with spaces in the middle. Bugfix on
- Tor 0.2.0.19-alpha.
- - Fix log messages and comments to avoid saying "GMT" when we mean
- "UTC". Fixes bug 6113.
- - Compile on win64 using mingw64. Fixes bug 7260; patches from
- "yayooo".
- - Fix a crash when debugging unit tests on Windows: deallocate a
- shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
- bugfix on 0.2.2.17-alpha. Reported by "ultramage".
- o Renamed options:
- - The DirServer option is now DirAuthority, for consistency with
- current naming patterns. You can still use the old DirServer form.
- o Code simplification and refactoring:
- - Move the client-side address-map/virtual-address/DNS-cache code
- out of connection_edge.c into a new addressmap.c module.
- - Remove unused code for parsing v1 directories and "running routers"
- documents. Fixes bug 6887.
- Changes in version 0.2.3.25 - 2012-11-19
- The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
- Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
- Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
- programmer, and friend. Unstinting in his dedication to the cause of
- freedom, he inspired and helped many of us as we began our work on
- anonymity, and inspires us still. Please honor his memory by writing
- software to protect people's freedoms, and by helping others to do so.
- Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
- significantly reduced directory overhead (via microdescriptors),
- enormous crypto performance improvements for fast relays on new
- enough hardware, a new v3 TLS handshake protocol that can better
- resist fingerprinting, support for protocol obfuscation plugins (aka
- pluggable transports), better scalability for hidden services, IPv6
- support for bridges, performance improvements like allowing clients
- to skip the first round-trip on the circuit ("optimistic data") and
- refilling token buckets more often, a new "stream isolation" design
- to isolate different applications on different circuits, and many
- stability, security, and privacy fixes.
- o Major bugfixes:
- - Tor tries to wipe potentially sensitive data after using it, so
- that if some subsequent security failure exposes Tor's memory,
- the damage will be limited. But we had a bug where the compiler
- was eliminating these wipe operations when it decided that the
- memory was no longer visible to a (correctly running) program,
- hence defeating our attempt at defense in depth. We fix that
- by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
- is unlikely to optimize away. Future versions of Tor may use
- a less ridiculously heavy approach for this. Fixes bug 7352.
- Reported in an article by Andrey Karpov.
- o Minor bugfixes:
- - Fix a harmless bug when opting against publishing a relay descriptor
- because DisableNetwork is set. Fixes bug 7464; bugfix on
- 0.2.3.9-alpha.
- Changes in version 0.2.4.6-alpha - 2012-11-13
- Tor 0.2.4.6-alpha fixes an assert bug that has been plaguing relays,
- makes our defense-in-depth memory wiping more reliable, and begins to
- count IPv6 addresses in bridge statistics,
- o Major bugfixes:
- - Fix an assertion failure that could occur when closing a connection
- with a spliced rendezvous circuit. Fix for bug 7212; bugfix on
- Tor 0.2.4.4-alpha.
- - Tor tries to wipe potentially sensitive data after using it, so
- that if some subsequent security failure exposes Tor's memory,
- the damage will be limited. But we had a bug where the compiler
- was eliminating these wipe operations when it decided that the
- memory was no longer visible to a (correctly running) program,
- hence defeating our attempt at defense in depth. We fix that
- by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
- is unlikely to optimize away. Future versions of Tor may use
- a less ridiculously heavy approach for this. Fixes bug 7352.
- Reported in an article by Andrey Karpov.
- o Minor features:
- - Add GeoIP database for IPv6 addresses. The new config option
- is GeoIPv6File.
- - Bridge statistics now count bridge clients connecting over IPv6:
- bridge statistics files now list "bridge-ip-versions" and
- extra-info documents list "geoip6-db-digest". The control protocol
- "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
- implementation by "shkoo", addressing ticket 5055.
- o Minor bugfixes:
- - Warn when we are binding low ports when hibernation is enabled;
- previously we had warned when we were _advertising_ low ports with
- hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
- - Fix a harmless bug when opting against publishing a relay descriptor
- because DisableNetwork is set. Fixes bug 7464; bugfix on
- 0.2.3.9-alpha.
- - Add warning message when a managed proxy dies during configuration.
- Fixes bug 7195; bugfix on 0.2.4.2-alpha.
- - Fix a linking error when building tor-fw-helper without miniupnp.
- Fixes bug 7235; bugfix on 0.2.4.2-alpha. Fix by Anthony G. Basile.
- - Check for closing an or_connection_t without going through correct
- channel functions; emit a warning and then call
- connection_or_close_for_error() so we don't assert as in bugs 7212
- and 7267.
- - Compile correctly on compilers without C99 designated initializer
- support. Fixes bug 7286; bugfix on 0.2.4.4-alpha.
- - Avoid a possible assert that can occur when channel_send_destroy() is
- called on a channel in CHANNEL_STATE_CLOSING, CHANNEL_STATE_CLOSED,
- or CHANNEL_STATE_ERROR when the Tor process is resumed after being
- blocked for a long interval. Fixes bug 7350; bugfix on 0.2.4.4-alpha.
- - Fix a memory leak on failing cases of channel_tls_process_certs_cell.
- Fixes bug 7422; bugfix on 0.2.4.4-alpha.
- o Code simplification and refactoring:
- - Start using OpenBSD's implementation of queue.h, so that we don't
- need to hand-roll our own pointer and list structures whenever we
- need them. (We can't rely on a sys/queue.h, since some operating
- systems don't have them, and the ones that do have them don't all
- present the same extensions.)
- Changes in version 0.2.4.5-alpha - 2012-10-25
- Tor 0.2.4.5-alpha comes hard at the heels of 0.2.4.4-alpha, to fix
- two important security vulnerabilities that could lead to remotely
- triggerable relay crashes, fix a major bug that was preventing clients
- from choosing suitable exit nodes, and refactor some of our code.
- o Major bugfixes (security, also in 0.2.3.24-rc):
- - Fix a group of remotely triggerable assertion failures related to
- incorrect link protocol negotiation. Found, diagnosed, and fixed
- by "some guy from France". Fix for CVE-2012-2250; bugfix on
- 0.2.3.6-alpha.
- - Fix a denial of service attack by which any directory authority
- could crash all the others, or by which a single v2 directory
- authority could crash everybody downloading v2 directory
- information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
- o Major bugfixes (also in 0.2.3.24-rc):
- - When parsing exit policy summaries from microdescriptors, we had
- previously been ignoring the last character in each one, so that
- "accept 80,443,8080" would be treated by clients as indicating
- a node that allows access to ports 80, 443, and 808. That would
- lead to clients attempting connections that could never work,
- and ignoring exit nodes that would support their connections. Now
- clients parse these exit policy summaries correctly. Fixes bug 7192;
- bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (also in 0.2.3.24-rc):
- - Clients now consider the ClientRejectInternalAddresses config option
- when using a microdescriptor consensus stanza to decide whether
- an exit relay would allow exiting to an internal address. Fixes
- bug 7190; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes:
- - Only disable TLS session ticket support when running as a TLS
- server. Now clients will blend better with regular Firefox
- connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
- o Code simplification and refactoring:
- - Start using OpenBSD's implementation of queue.h (originally by
- Niels Provos).
- - Move the entry node code from circuitbuild.c to its own file.
- - Move the circuit build timeout tracking code from circuitbuild.c
- to its own file.
- Changes in version 0.2.3.24-rc - 2012-10-25
- Tor 0.2.3.24-rc fixes two important security vulnerabilities that
- could lead to remotely triggerable relay crashes, and fixes
- a major bug that was preventing clients from choosing suitable exit
- nodes.
- o Major bugfixes (security):
- - Fix a group of remotely triggerable assertion failures related to
- incorrect link protocol negotiation. Found, diagnosed, and fixed
- by "some guy from France". Fix for CVE-2012-2250; bugfix on
- 0.2.3.6-alpha.
- - Fix a denial of service attack by which any directory authority
- could crash all the others, or by which a single v2 directory
- authority could crash everybody downloading v2 directory
- information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
- o Major bugfixes:
- - When parsing exit policy summaries from microdescriptors, we had
- previously been ignoring the last character in each one, so that
- "accept 80,443,8080" would be treated by clients as indicating
- a node that allows access to ports 80, 443, and 808. That would
- lead to clients attempting connections that could never work,
- and ignoring exit nodes that would support their connections. Now
- clients parse these exit policy summaries correctly. Fixes bug 7192;
- bugfix on 0.2.3.1-alpha.
- o Minor bugfixes:
- - Clients now consider the ClientRejectInternalAddresses config option
- when using a microdescriptor consensus stanza to decide whether
- an exit relay would allow exiting to an internal address. Fixes
- bug 7190; bugfix on 0.2.3.1-alpha.
- Changes in version 0.2.4.4-alpha - 2012-10-20
- Tor 0.2.4.4-alpha adds a new v3 directory authority, fixes a privacy
- vulnerability introduced by a change in OpenSSL, fixes a remotely
- triggerable assert, and adds new channel_t and circuitmux_t abstractions
- that will make it easier to test new connection transport and cell
- scheduling algorithms.
- o New directory authorities (also in 0.2.3.23-rc):
- - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
- authority. Closes ticket 5749.
- o Major bugfixes (security/privacy, also in 0.2.3.23-rc):
- - Disable TLS session tickets. OpenSSL's implementation was giving
- our TLS session keys the lifetime of our TLS context objects, when
- perfect forward secrecy would want us to discard anything that
- could decrypt a link connection as soon as the link connection
- was closed. Fixes bug 7139; bugfix on all versions of Tor linked
- against OpenSSL 1.0.0 or later. Found by Florent Daignière.
- - Discard extraneous renegotiation attempts once the V3 link
- protocol has been initiated. Failure to do so left us open to
- a remotely triggerable assertion failure. Fixes CVE-2012-2249;
- bugfix on 0.2.3.6-alpha. Reported by "some guy from France".
- o Internal abstraction features:
- - Introduce new channel_t abstraction between circuits and
- or_connection_t to allow for implementing alternate OR-to-OR
- transports. A channel_t is an abstract object which can either be a
- cell-bearing channel, which is responsible for authenticating and
- handshaking with the remote OR and transmitting cells to and from
- it, or a listening channel, which spawns new cell-bearing channels
- at the request of remote ORs. Implements part of ticket 6465.
- - Also new is the channel_tls_t subclass of channel_t, adapting it
- to the existing or_connection_t code. The V2/V3 protocol handshaking
- code which formerly resided in command.c has been moved below the
- channel_t abstraction layer and may be found in channeltls.c now.
- Implements the rest of ticket 6465.
- - Introduce new circuitmux_t storing the queue of circuits for
- a channel; this encapsulates and abstracts the queue logic and
- circuit selection policy, and allows the latter to be overridden
- easily by switching out a policy object. The existing EWMA behavior
- is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
- o Required libraries:
- - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
- strongly recommended.
- o Minor features:
- - Warn users who run hidden services on a Tor client with
- UseEntryGuards disabled that their hidden services will be
- vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
- attack which motivated Tor to support entry guards in the first
- place). Resolves ticket 6889.
- - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
- dhill. Resolves ticket 6982.
- - Option OutboundBindAddress can be specified multiple times and
- accepts IPv6 addresses. Resolves ticket 6876.
- o Minor bugfixes (also in 0.2.3.23-rc):
- - Don't serve or accept v2 hidden service descriptors over a
- relay's DirPort. It's never correct to do so, and disabling it
- might make it more annoying to exploit any bugs that turn up in the
- descriptor-parsing code. Fixes bug 7149.
- - Fix two cases in src/or/transports.c where we were calling
- fmt_addr() twice in a parameter list. Bug found by David
- Fifield. Fixes bug 7014; bugfix on 0.2.3.9-alpha.
- - Fix memory leaks whenever we logged any message about the "path
- bias" detection. Fixes bug 7022; bugfix on 0.2.3.21-rc.
- - When relays refuse a "create" cell because their queue of pending
- create cells is too big (typically because their cpu can't keep up
- with the arrival rate), send back reason "resource limit" rather
- than reason "internal", so network measurement scripts can get a
- more accurate picture. Fixes bug 7037; bugfix on 0.1.1.11-alpha.
- o Minor bugfixes:
- - Command-line option "--version" implies "--quiet". Fixes bug 6997.
- - Free some more still-in-use memory at exit, to make hunting for
- memory leaks easier. Resolves bug 7029.
- - When a Tor client gets a "truncated" relay cell, the first byte of
- its payload specifies why the circuit was truncated. We were
- ignoring this 'reason' byte when tearing down the circuit, resulting
- in the controller not being told why the circuit closed. Now we
- pass the reason from the truncated cell to the controller. Bugfix
- on 0.1.2.3-alpha; fixes bug 7039.
- - Downgrade "Failed to hand off onionskin" messages to "debug"
- severity, since they're typically redundant with the "Your computer
- is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
- - Make clients running with IPv6 bridges connect over IPv6 again,
- even without setting new config options ClientUseIPv6 and
- ClientPreferIPv6ORPort. Fixes bug 6757; bugfix on 0.2.4.1-alpha.
- - Use square brackets around IPv6 addresses in numerous places
- that needed them, including log messages, HTTPS CONNECT proxy
- requests, TransportProxy statefile entries, and pluggable transport
- extra-info lines. Fixes bug 7011; patch by David Fifield.
- o Code refactoring and cleanup:
- - Source files taken from other packages now reside in src/ext;
- previously they were scattered around the rest of Tor.
- - Avoid use of reserved identifiers in our C code. The C standard
- doesn't like us declaring anything that starts with an
- underscore, so let's knock it off before we get in trouble. Fix
- for bug 1031; bugfix on the first Tor commit.
- Changes in version 0.2.3.23-rc - 2012-10-20
- Tor 0.2.3.23-rc adds a new v3 directory authority, fixes a privacy
- vulnerability introduced by a change in OpenSSL, and fixes a variety
- of smaller bugs in preparation for the release.
- o New directory authorities:
- - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
- authority. Closes ticket 5749.
- o Major bugfixes (security/privacy):
- - Disable TLS session tickets. OpenSSL's implementation was giving
- our TLS session keys the lifetime of our TLS context objects, when
- perfect forward secrecy would want us to discard anything that
- could decrypt a link connection as soon as the link connection
- was closed. Fixes bug 7139; bugfix on all versions of Tor linked
- against OpenSSL 1.0.0 or later. Found by Florent Daignière.
- - Discard extraneous renegotiation attempts once the V3 link
- protocol has been initiated. Failure to do so left us open to
- a remotely triggerable assertion failure. Fixes CVE-2012-2249;
- bugfix on 0.2.3.6-alpha. Reported by "some guy from France".
- o Major bugfixes:
- - Fix a possible crash bug when checking for deactivated circuits
- in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
- bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
- o Minor bugfixes (on 0.2.3.x):
- - Fix two cases in src/or/transports.c where we were calling
- fmt_addr() twice in a parameter list. Bug found by David
- Fifield. Fixes bug 7014; bugfix on 0.2.3.9-alpha.
- - Convert an assert in the pathbias code to a log message. The assert
- appears to only be triggerable by Tor2Web mode. Fixes bug 6866;
- bugfix on 0.2.3.17-beta.
- - Fix memory leaks whenever we logged any message about the "path
- bias" detection. Fixes bug 7022; bugfix on 0.2.3.21-rc.
- o Minor bugfixes (on 0.2.2.x and earlier):
- - Don't serve or accept v2 hidden service descriptors over a relay's
- DirPort. It's never correct to do so, and disabling it might
- make it more annoying to exploit any bugs that turn up in the
- descriptor-parsing code. Fixes bug 7149.
- - When relays refuse a "create" cell because their queue of pending
- create cells is too big (typically because their cpu can't keep up
- with the arrival rate), send back reason "resource limit" rather
- than reason "internal", so network measurement scripts can get a
- more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
- - Correct file sizes when reading binary files on Cygwin, to avoid
- a bug where Tor would fail to read its state file. Fixes bug 6844;
- bugfix on 0.1.2.7-alpha.
- - Avoid undefined behavior when parsing the list of supported
- rendezvous/introduction protocols in a hidden service descriptor.
- Previously, Tor would have confused (as-yet-unused) protocol version
- numbers greater than 32 with lower ones on many platforms. Fixes
- bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
- o Documentation fixes:
- - Clarify that hidden services are TCP only. Fixes bug 6024.
- Changes in version 0.2.4.3-alpha - 2012-09-22
- Tor 0.2.4.3-alpha fixes another opportunity for a remotely triggerable
- assertion, resumes letting relays test reachability of their DirPort,
- and cleans up a bunch of smaller bugs.
- o Security fixes:
- - Fix an assertion failure in tor_timegm() that could be triggered
- by a badly formatted directory object. Bug found by fuzzing with
- Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
- o Major bugfixes:
- - Fix a possible crash bug when checking for deactivated circuits
- in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
- bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
- - Allow routers to detect that their own DirPorts are running. When
- we removed support for versions_supports_begindir, we also
- accidentally removed the mechanism we used to self-test our
- DirPort. Diagnosed with help from kargig. Fixes bugs 6814 and 6815;
- bugfix on 0.2.4.2-alpha.
- o Security features:
- - Switch to a completely time-invariant approach for picking nodes
- weighted by bandwidth. Our old approach would run through the
- part of the loop after it had made its choice slightly slower
- than it ran through the part of the loop before it had made its
- choice. Addresses ticket 6538.
- - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
- by tor2web clients allows hidden services to identify tor2web
- clients through their repeated selection of the same rendezvous
- and introduction point circuit endpoints (their guards). Resolves
- ticket 6888.
- o Minor features:
- - Enable Tor to read configuration, state, and key information from
- a FIFO. Previously Tor would only read from files with a positive
- stat.st_size. Code from meejah; fixes bug 6044.
- o Minor bugfixes:
- - Correct file sizes when reading binary files on Cygwin, to avoid
- a bug where Tor would fail to read its state file. Fixes bug 6844;
- bugfix on 0.1.2.7-alpha.
- - Correctly handle votes with more than 31 flags. Fixes bug 6853;
- bugfix on 0.2.0.3-alpha.
- - When complaining about a client port on a public address, log
- which address we're complaining about. Fixes bug 4020; bugfix on
- 0.2.3.3-alpha. Patch by Tom Fitzhenry.
- - Convert an assert in the pathbias code to a log message. The assert
- appears to only be triggerable by Tor2Web mode. Fixes bug 6866;
- bugfix on 0.2.3.17-beta.
- - Our new buildsystem was overzealous about rebuilding manpages: it
- would rebuild them all whenever any one of them changed. Now our
- dependency checking should be correct. Fixes bug 6843; bugfix on
- 0.2.4.1-alpha.
- - Don't do reachability testing over IPv6 unless AuthDirPublishIPv6
- is set. Fixes bug 6880. Bugfix on 0.2.4.1-alpha.
- - Correct log printout about which address family is preferred
- when connecting to a bridge with both an IPv4 and IPv6 OR port.
- Fixes bug 6884; bugfix on 0.2.4.1-alpha.
- o Minor bugfixes (code cleanliness):
- - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
- with large values. This situation was untriggered, but nevertheless
- incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
- - Reject consensus votes with more than 64 known-flags. We aren't even
- close to that limit yet, and our code doesn't handle it correctly.
- Fixes bug 6833; bugfix on 0.2.0.1-alpha.
- - Avoid undefined behavior when parsing the list of supported
- rendezvous/introduction protocols in a hidden service descriptor.
- Previously, Tor would have confused (as-yet-unused) protocol version
- numbers greater than 32 with lower ones on many platforms. Fixes
- bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
- - Fix handling of rendezvous client authorization types over 8.
- Fixes bug 6861; bugfix on 0.2.1.5-alpha.
- - Fix building with older versions of GCC (2.95, for one) that don't
- like preprocessor directives inside macro arguments. Found by
- grarpamp. Fixes bug 6842; bugfix on 0.2.4.2-alpha.
- - Switch weighted node selection rule from using a list of doubles
- to using a list of int64_t. This change should make the process
- slightly easier to debug and maintain. Needed to finish ticket 6538.
- o Code simplification and refactoring:
- - Move the generic "config" code into a new file, and have "config.c"
- hold only torrc- and state-related code. Resolves ticket 6823.
- - Move the core of our "choose a weighted element at random" logic
- into its own function, and give it unit tests. Now the logic is
- testable, and a little less fragile too.
- - Removed the testing_since field of node_t, which hasn't been used
- for anything since 0.2.0.9-alpha.
- o Documentation fixes:
- - Clarify that hidden services are TCP only. Fixes bug 6024.
- - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
- 0.2.3.14-alpha.
- Changes in version 0.2.3.22-rc - 2012-09-11
- Tor 0.2.3.22-rc fixes another opportunity for a remotely triggerable
- assertion.
- o Security fixes:
- - Fix an assertion failure in tor_timegm() that could be triggered
- by a badly formatted directory object. Bug found by fuzzing with
- Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
- o Minor bugfixes:
- - Avoid segfault when starting up having run with an extremely old
- version of Tor and parsing its state file. Fixes bug 6801; bugfix
- on 0.2.2.23-alpha.
- Changes in version 0.2.2.39 - 2012-09-11
- Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
- assertions.
- o Security fixes:
- - Fix an assertion failure in tor_timegm() that could be triggered
- by a badly formatted directory object. Bug found by fuzzing with
- Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
- - Do not crash when comparing an address with port value 0 to an
- address policy. This bug could have been used to cause a remote
- assertion failure by or against directory authorities, or to
- allow some applications to crash clients. Fixes bug 6690; bugfix
- on 0.2.1.10-alpha.
- Changes in version 0.2.4.2-alpha - 2012-09-10
- Tor 0.2.4.2-alpha enables port forwarding for pluggable transports,
- raises the default rate limiting even more, and makes the bootstrapping
- log messages less noisy.
- o Major features:
- - Automatically forward the TCP ports of pluggable transport
- proxies using tor-fw-helper if PortForwarding is enabled. Implements
- ticket 4567.
- o Major bugfixes:
- - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
- to 1GB/1GB. The previous defaults were intended to be "basically
- infinite", but it turns out they're now limiting our 100mbit+
- relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
- last time we raised it).
- o Minor features:
- - Detect when we're running with a version of OpenSSL other than the
- one we compiled with. This has occasionally given people hard-to-
- track-down errors.
- - Log fewer lines at level "notice" about our OpenSSL and Libevent
- versions and capabilities when everything is going right. Resolves
- part of ticket 6736.
- - Directory authorities no long accept descriptors for any version of
- Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
- These versions are insecure, unsupported, or both. Implements
- ticket 6789.
- o Minor bugfixes:
- - Rename the (internal-use-only) UsingTestingNetworkDefaults option
- to start with a triple-underscore so the controller won't touch it.
- Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
- - Avoid segfault when starting up having run with an extremely old
- version of Tor and parsing its state file. Fixes bug 6801; bugfix
- on 0.2.2.23-alpha.
- - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
- so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
- - Don't follow the NULL pointer if microdescriptor generation fails.
- (This does not appear to be triggerable, but it's best to be safe.)
- Found by "f. tp.". Fixes bug 6797; bugfix on 0.2.4.1-alpha.
- - Fix mis-declared dependencies on src/common/crypto.c and
- src/or/tor_main.c that could break out-of-tree builds under some
- circumstances. Fixes bug 6778; bugfix on 0.2.4.1-alpha.
- - Avoid a warning when building common_sha1.i out of tree. Fixes bug
- 6778; bugfix on 0.2.4.1-alpha.
- - Fix a harmless (in this case) build warning for implicitly
- converting a strlen() to an int. Bugfix on 0.2.4.1-alpha.
- o Removed features:
- - Now that all versions before 0.2.2.x are disallowed, we no longer
- need to work around their missing features. Thus we can remove a
- bunch of compatibility code.
- o Code refactoring:
- - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
- TCP ports to forward. In the past it only accepted two ports:
- the ORPort and the DirPort.
- Changes in version 0.2.4.1-alpha - 2012-09-05
- Tor 0.2.4.1-alpha lets bridges publish their pluggable transports to
- bridgedb; lets relays use IPv6 addresses and directory authorities
- advertise them; and switches to a cleaner build interface.
- This is the first alpha release in a new series, so expect there to
- be bugs. Users who would rather test out a more stable branch should
- stay with 0.2.3.x for now.
- o Major features (bridges):
- - Bridges now report the pluggable transports they support to the
- bridge authority, so it can pass the supported transports on to
- bridgedb and/or eventually do reachability testing. Implements
- ticket 3589.
- o Major features (IPv6):
- - Bridge authorities now accept IPv6 bridge addresses and include
- them in network status documents. Implements ticket 5534.
- - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
- IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
- to happen. Implements ticket 5535.
- - All kind of relays, not just bridges, can now advertise an IPv6
- OR port. Implements ticket 6362.
- - Directory authorities vote on IPv6 OR ports using the new consensus
- method 14. Implements ticket 6363.
- o Major features (build):
- - Switch to a nonrecursive Makefile structure. Now instead of each
- Makefile.am invoking other Makefile.am's, there is a master
- Makefile.am that includes the others. This change makes our build
- process slightly more maintainable, and improves parallelism for
- building with make -j. Original patch by Stewart Smith; various
- fixes by Jim Meyering.
- - Where available, we now use automake's "silent" make rules by
- default, so that warnings are easier to spot. You can get the old
- behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
- o Minor features (code security and spec conformance):
- - Clear keys and key-derived material left on the stack in
- rendservice.c and rendclient.c. Check return value of
- crypto_pk_write_private_key_to_string() in rend_service_load_keys().
- These fixes should make us more forward-secure against cold-boot
- attacks and the like. Fixes bug 2385.
- - Reject EXTEND cells sent to nonexistent streams. According to the
- spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
- we were only checking for stream IDs that were currently in use.
- Found while hunting for more instances of bug 6271. Bugfix on
- 0.0.2pre8, which introduced incremental circuit construction.
- o Minor features (streamlining);
- - No longer include the "opt" prefix when generating routerinfos
- or v2 directories: it has been needless since Tor 0.1.2. Closes
- ticket 5124.
- - Remove some now-needless code that tried to aggressively flush
- OR connections as data was added to them. Since 0.2.0.1-alpha, our
- cell queue logic has saved us from the failure mode that this code
- was supposed to prevent. Removing this code will limit the number
- of baroque control flow paths through Tor's network logic. Reported
- pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
- o Minor features (controller):
- - Add a "GETINFO signal/names" control port command. Implements
- ticket 3842.
- - Provide default values for all options via "GETINFO config/defaults".
- Implements ticket 4971.
- o Minor features (IPv6):
- - New config option "AuthDirHasIPv6Connectivity 1" that directory
- authorities should set if they have IPv6 connectivity and want to
- do reachability tests for IPv6 relays. Implements feature 5974.
- - A relay with an IPv6 OR port now sends that address in NETINFO
- cells (in addition to its other address). Implements ticket 6364.
- o Minor features (log messages):
- - Omit the first heartbeat log message, because it never has anything
- useful to say, and it clutters up the bootstrapping messages.
- Resolves ticket 6758.
- - Don't log about reloading the microdescriptor cache at startup. Our
- bootstrap warnings are supposed to tell the user when there's a
- problem, and our bootstrap notices say when there isn't. Resolves
- ticket 6759; bugfix on 0.2.2.6-alpha.
- - Don't log "I learned some more directory information" when we're
- reading cached directory information. Reserve it for when new
- directory information arrives in response to a fetch. Resolves
- ticket 6760.
- - Prevent rounding error in path bias counts when scaling
- them down, and use the correct scale factor default. Also demote
- some path bias related log messages down a level and make others
- less scary sounding. Fixes bug 6647. Bugfix against 0.2.3.17-beta.
- - We no longer warn so much when generating manpages from their
- asciidoc source.
- o Code simplifications and refactoring:
- - Enhance our internal sscanf replacement so that we can eliminate
- the last remaining uses of the system sscanf. (Though those uses
- of sscanf were safe, sscanf itself is generally error prone, so
- we want to eliminate when we can.) Fixes ticket 4195 and Coverity
- CID 448.
- - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
- - Move last_reachable and testing_since from routerinfo_t to node_t.
- Implements ticket 5529.
- - Add replaycache_t structure, functions and unit tests, then refactor
- rend_service_introduce() to be more clear to read, improve, debug,
- and test. Resolves bug 6177.
- - Finally remove support for malloc_good_size and malloc_usable_size.
- We had hoped that these functions would let us eke a little more
- memory out of our malloc implementation. Unfortunately, the only
- implementations that provided these functions are also ones that
- are already efficient about not overallocation: they never got us
- more than 7 or so bytes per allocation. Removing them saves us a
- little code complexity and a nontrivial amount of build complexity.
- o New requirements:
- - Tor maintainers now require Automake version 1.9 or later to build
- Tor from the Git repository. (Automake is not required when building
- from a source distribution.)
- Changes in version 0.2.3.21-rc - 2012-09-05
- Tor 0.2.3.21-rc is the fourth release candidate for the Tor 0.2.3.x
- series. It fixes a trio of potential security bugs, fixes a bug where
- we were leaving some of the fast relays out of the microdescriptor
- consensus, resumes interpreting "ORPort 0" and "DirPort 0" correctly,
- and cleans up other smaller issues.
- o Major bugfixes (security):
- - Tear down the circuit if we get an unexpected SENDME cell. Clients
- could use this trick to make their circuits receive cells faster
- than our flow control would have allowed, or to gum up the network,
- or possibly to do targeted memory denial-of-service attacks on
- entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
- from July 2002, before the release of Tor 0.0.0. We had committed
- this patch previously, but we had to revert it because of bug 6271.
- Now that 6271 is fixed, this patch appears to work.
- - Reject any attempt to extend to an internal address. Without
- this fix, a router could be used to probe addresses on an internal
- network to see whether they were accepting connections. Fixes bug
- 6710; bugfix on 0.0.8pre1.
- - Do not crash when comparing an address with port value 0 to an
- address policy. This bug could have been used to cause a remote
- assertion failure by or against directory authorities, or to
- allow some applications to crash clients. Fixes bug 6690; bugfix
- on 0.2.1.10-alpha.
- o Major bugfixes:
- - Remove the upper bound on microdescriptor length. We were hitting
- the limit for routers with complex exit policies or family
- declarations, causing clients to not use them. Fixes the first
- piece of bug 6404; fix on 0.2.2.6-alpha.
- - Detect "ORPort 0" as meaning, uniformly, that we're not running
- as a relay. Previously, some of our code would treat the presence
- of any ORPort line as meaning that we should act like a relay,
- even though our new listener code would correctly not open any
- ORPorts for ORPort 0. Similar bugs in other Port options are also
- fixed. Fixes the first half of bug 6507; bugfix on 0.2.3.3-alpha.
- o Minor bugfixes:
- - Avoid a pair of double-free and use-after-mark bugs that can
- occur with certain timings in canceled and re-received DNS
- requests. Fixes bug 6472; bugfix on 0.0.7rc1.
- - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
- Fixes bug 6379. Bugfix on 0.2.0.20-rc.
- - Allow one-hop directory fetching circuits the full "circuit build
- timeout" period, rather than just half of it, before failing them
- and marking the relay down. This fix should help reduce cases where
- clients declare relays (or worse, bridges) unreachable because
- the TLS handshake takes a few seconds to complete. Fixes bug 6743;
- bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
- 30 seconds.
- - Authorities no longer include any router in their microdescriptor
- consensuses for which they couldn't generate or agree on a
- microdescriptor. Fixes the second piece of bug 6404; fix on
- 0.2.2.6-alpha.
- - Detect and reject attempts to specify both "FooPort" and
- "FooPort 0" in the same configuration domain. (It's still okay
- to have a FooPort in your configuration file, and use "FooPort 0"
- on the command line to disable it.) Fixes the second half of bug
- 6507; bugfix on 0.2.3.3-alpha.
- - Make wildcarded addresses (that is, ones beginning with "*.") work
- when provided via the controller's MapAddress command. Previously,
- they were accepted, but we never actually noticed that they were
- wildcards. Fixes bug 6244; bugfix on 0.2.3.9-alpha.
- - Avoid crashing on a malformed state file where EntryGuardPathBias
- precedes EntryGuard. Fix for bug 6774; bugfix on 0.2.3.17-beta.
- - Add a (probably redundant) memory clear between iterations of
- the router status voting loop, to prevent future coding errors
- where data might leak between iterations of the loop. Resolves
- ticket 6514.
- o Minor bugfixes (log messages):
- - Downgrade "set buildtimeout to low value" messages to "info"
- severity; they were never an actual problem, there was never
- anything reasonable to do about them, and they tended to spam logs
- from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
- - Downgrade path-bias warning messages to "info". We'll try to get
- them working better in 0.2.4. Add internal circuit construction
- state to protect against the noisy warn message "Unexpectedly high
- circuit_successes". Also add some additional rate-limited notice
- messages to help determine the root cause of the warn. Fixes bug
- 6475. Bugfix against 0.2.3.17-beta.
- - Move log message when unable to find a microdesc in a routerstatus
- entry to parse time. Previously we'd spam this warning every time
- we tried to figure out which microdescriptors to download. Fixes
- the third piece of bug 6404; fix on 0.2.3.18-rc.
- o Minor features:
- - Consider new, removed or changed IPv6 OR ports a non-cosmetic
- change when the authority is deciding whether to accept a newly
- uploaded descriptor. Implements ticket 6423.
- - Add missing documentation for consensus and microdesc files.
- Resolves ticket 6732.
- Changes in version 0.2.2.38 - 2012-08-12
- Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
- attack that could in theory leak path information.
- o Security fixes:
- - Avoid an uninitialized memory read when reading a vote or consensus
- document that has an unrecognized flavor name. This read could
- lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
- - Try to leak less information about what relays a client is
- choosing to a side-channel attacker. Previously, a Tor client would
- stop iterating through the list of available relays as soon as it
- had chosen one, thus finishing a little earlier when it picked
- a router earlier in the list. If an attacker can recover this
- timing information (nontrivial but not proven to be impossible),
- they could learn some coarse-grained information about which relays
- a client was picking (middle nodes in particular are likelier to
- be affected than exits). The timing attack might be mitigated by
- other factors (see bug 6537 for some discussion), but it's best
- not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
- Changes in version 0.2.3.20-rc - 2012-08-05
- Tor 0.2.3.20-rc is the third release candidate for the Tor 0.2.3.x
- series. It fixes a pair of code security bugs and a potential anonymity
- issue, updates our RPM spec files, and cleans up other smaller issues.
- o Security fixes:
- - Avoid read-from-freed-memory and double-free bugs that could occur
- when a DNS request fails while launching it. Fixes bug 6480;
- bugfix on 0.2.0.1-alpha.
- - Avoid an uninitialized memory read when reading a vote or consensus
- document that has an unrecognized flavor name. This read could
- lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
- - Try to leak less information about what relays a client is
- choosing to a side-channel attacker. Previously, a Tor client would
- stop iterating through the list of available relays as soon as it
- had chosen one, thus finishing a little earlier when it picked
- a router earlier in the list. If an attacker can recover this
- timing information (nontrivial but not proven to be impossible),
- they could learn some coarse-grained information about which relays
- a client was picking (middle nodes in particular are likelier to
- be affected than exits). The timing attack might be mitigated by
- other factors (see bug 6537 for some discussion), but it's best
- not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
- o Minor features:
- - Try to make the warning when giving an obsolete SOCKSListenAddress
- a little more useful.
- - Terminate active server managed proxies if Tor stops being a
- relay. Addresses parts of bug 6274; bugfix on 0.2.3.6-alpha.
- - Provide a better error message about possible OSX Asciidoc failure
- reasons. Fixes bug 6436.
- - Warn when Tor is configured to use accounting in a way that can
- link a hidden service to some other hidden service or public
- address. Resolves ticket 6490.
- o Minor bugfixes:
- - Check return value of fputs() when writing authority certificate
- file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
- - Ignore ServerTransportPlugin lines when Tor is not configured as
- a relay. Fixes bug 6274; bugfix on 0.2.3.6-alpha.
- - When disabling guards for having too high a proportion of failed
- circuits, make sure to look at each guard. Fixes bug 6397; bugfix
- on 0.2.3.17-beta.
- o Packaging (RPM):
- - Update our default RPM spec files to work with mock and rpmbuild
- on RHEL/Fedora. They have an updated set of dependencies and
- conflicts, a fix for an ancient typo when creating the "_tor"
- user, and better instructions. Thanks to Ondrej Mikle for the
- patch series. Fixes bug 6043.
- o Testing:
- - Make it possible to set the TestingTorNetwork configuration
- option using AlternateDirAuthority and AlternateBridgeAuthority
- as an alternative to setting DirServer. Addresses ticket 6377.
- o Documentation:
- - Clarify the documentation for the Alternate*Authority options.
- Fixes bug 6387.
- - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
- o Code simplification and refactoring:
- - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
- 10 lines. Also, don't nest them. Doing so in the past has
- led to hard-to-debug code. The new style is to use the
- SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
- Changes in version 0.2.3.19-rc - 2012-07-06
- Tor 0.2.3.19-rc is the second release candidate for the Tor 0.2.3.x
- series. It fixes the compile on Windows, reverts to a GeoIP database
- that isn't as broken, and fixes a flow control bug that has been around
- since the beginning of Tor.
- o Major bugfixes:
- - Fix a bug handling SENDME cells on nonexistent streams that could
- result in bizarre window values. Report and patch contributed
- pseudonymously. Fixes part of bug 6271. This bug was introduced
- before the first Tor release, in svn commit r152.
- - Revert to the May 1 2012 Maxmind GeoLite Country database. In the
- June 2012 database, Maxmind marked many Tor relays as country "A1",
- which will cause risky behavior for clients that set EntryNodes
- or ExitNodes. Addresses bug 6334; bugfix on 0.2.3.17-beta.
- - Instead of ENOBUFS on Windows, say WSAENOBUFS. Fixes compilation
- on Windows. Fixes bug 6296; bugfix on 0.2.3.18-rc.
- o Minor bugfixes:
- - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
- bugfix on 0.2.1.10-alpha.
- Changes in version 0.2.3.18-rc - 2012-06-28
- Tor 0.2.3.18-rc is the first release candidate for the Tor 0.2.3.x
- series. It fixes a few smaller bugs, but generally appears stable.
- Please test it and let us know whether it is!
- o Major bugfixes:
- - Allow wildcarded mapaddress targets to be specified on the
- controlport. Partially fixes bug 6244; bugfix on 0.2.3.9-alpha.
- - Make our linker option detection code more robust against linkers
- such as on FreeBSD 8, where a bad combination of options completes
- successfully but makes an unrunnable binary. Fixes bug 6173;
- bugfix on 0.2.3.17-beta.
- o Minor bugfixes (on 0.2.2.x and earlier):
- - Avoid a false positive in the util/threads unit test by increasing
- the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
- - Replace "Sending publish request" log messages with "Launching
- upload", so that they no longer confusingly imply that we're
- sending something to a directory we might not even be connected
- to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
- - Make sure to set *socket_error in all error cases in
- connection_connect(), so it can't produce a warning about
- errno being zero from errno_to_orconn_end_reason(). Bugfix on
- 0.2.1.1-alpha; resolves ticket 6028.
- - Downgrade "Got a certificate, but we already have it" log messages
- from warning to info, except when we're a dirauth. Fixes bug 5238;
- bugfix on 0.2.1.7-alpha.
- - When checking for requested signatures on the latest consensus
- before serving it to a client, make sure to check the right
- consensus flavor. Bugfix on 0.2.2.6-alpha.
- - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
- Fixes bug 5932; bugfix on 0.2.2.7-alpha.
- o Minor bugfixes (on 0.2.3.x):
- - Make format_helper_exit_status() avoid unnecessary space padding
- and stop confusing log_from_pipe(). Fixes ticket 5557; bugfix
- on 0.2.3.1-alpha.
- - Downgrade a message about cleaning the microdescriptor cache to
- "info" from "notice". Fixes bug 6238; bugfix on 0.2.3.1-alpha.
- - Log a BUG message at severity INFO if we have a networkstatus with
- a missing entry for some microdescriptor. Continues on a patch
- to 0.2.3.2-alpha.
- - Improve the log message when a managed proxy fails to launch. Fixes
- bug 5099; bugfix on 0.2.3.6-alpha.
- - Don't do DNS lookups when parsing corrupted managed proxy protocol
- messages. Fixes bug 6226; bugfix on 0.2.3.6-alpha.
- - When formatting wildcarded address mappings for the controller,
- be sure to include "*." as appropriate. Partially fixes bug 6244;
- bugfix on 0.2.3.9-alpha.
- - Avoid a warning caused by using strcspn() from glibc with clang 3.0.
- Bugfix on 0.2.3.13-alpha.
- - Stop logging messages about running with circuit timeout learning
- enabled at severity LD_BUG. Fixes bug 6169; bugfix on 0.2.3.17-beta.
- - Disable a spurious warning about reading on a marked and flushing
- connection. We shouldn't be doing that, but apparently we
- sometimes do. Fixes bug 6203; bugfix on 0.2.3.17-beta.
- - Fix a bug that stopped AllowDotExit from working on addresses
- that had an entry in the DNS cache. Fixes bug 6211; bugfix on
- 0.2.3.17-beta.
- o Code simplification, refactoring, unit tests:
- - Move tor_gettimeofday_cached() into compat_libevent.c, and use
- Libevent's notion of cached time when possible.
- - Remove duplicate code for invoking getrlimit() from control.c.
- - Add a unit test for the environment_variable_names_equal function.
- o Documentation:
- - Document the --defaults-torrc option, and the new (in 0.2.3)
- semantics for overriding, extending, and clearing lists of
- options. Closes bug 4748.
- Changes in version 0.2.3.17-beta - 2012-06-15
- Tor 0.2.3.17-beta enables compiler and linker hardening by default,
- gets our TLS handshake back on track for being able to blend in with
- Firefox, fixes a big bug in 0.2.3.16-alpha that broke Tor's interaction
- with Vidalia, and otherwise continues to get us closer to a release
- candidate.
- o Major features:
- - Enable gcc and ld hardening by default. Resolves ticket 5210.
- - Update TLS cipher list to match Firefox 8 and later. Resolves
- ticket 4744.
- - Implement the client side of proposal 198: remove support for
- clients falsely claiming to support standard ciphersuites that
- they can actually provide. As of modern OpenSSL versions, it's not
- necessary to fake any standard ciphersuite, and doing so prevents
- us from using better ciphersuites in the future, since servers
- can't know whether an advertised ciphersuite is really supported or
- not. Some hosts -- notably, ones with very old versions of OpenSSL
- or where OpenSSL has been built with ECC disabled -- will stand
- out because of this change; TBB users should not be affected.
- o Major bugfixes:
- - Change the default value for DynamicDHGroups (introduced in
- 0.2.3.9-alpha) to 0. This feature can make Tor relays less
- identifiable by their use of the mod_ssl DH group, but at
- the cost of some usability (#4721) and bridge tracing (#6087)
- regressions. Resolves ticket 5598.
- - Send a CRLF at the end of each STATUS_* control protocol event. This
- bug tickled a bug in Vidalia which would make it freeze. Fixes
- bug 6094; bugfix on 0.2.3.16-alpha.
- o Minor bugfixes:
- - Disable writing on marked-for-close connections when they are
- blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
- bug 5263; bugfix on 0.0.2pre13, where we first added a special
- case for flushing marked connections.
- - Detect SSL handshake even when the initial attempt to write the
- server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
- - Change the AllowDotExit rules so they should actually work.
- We now enforce AllowDotExit only immediately after receiving an
- address via SOCKS or DNSPort: other sources are free to provide
- .exit addresses after the resolution occurs. Fixes bug 3940;
- bugfix on 0.2.2.1-alpha.
- - Fix a (harmless) integer overflow in cell statistics reported by
- some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
- - Make sure circuitbuild.c checks LearnCircuitBuildTimeout in all the
- right places and never depends on the consensus parameters or
- computes adaptive timeouts when it is disabled. Fixes bug 5049;
- bugfix on 0.2.2.14-alpha.
- - When building Tor on Windows with -DUNICODE (not default), ensure
- that error messages, filenames, and DNS server names are always
- NUL-terminated when we convert them to a single-byte encoding.
- Fixes bug 5909; bugfix on 0.2.2.16-alpha.
- - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
- Fixes bug 6097; bugfix on 0.2.2.16-alpha.
- - Fix an edge case where TestingTorNetwork is set but the authorities
- and relays all have an uptime of zero, where the private Tor network
- could briefly lack support for hidden services. Fixes bug 3886;
- bugfix on 0.2.2.18-alpha.
- - Correct the manpage's descriptions for the default values of
- DirReqStatistics and ExtraInfoStatistics. Fixes bug 2865; bugfix
- on 0.2.3.1-alpha.
- - Fix the documentation for the --hush and --quiet command line
- options, which changed their behavior back in 0.2.3.3-alpha.
- - Fix compilation warning with clang 3.1. Fixes bug 6141; bugfix on
- 0.2.3.11-alpha.
- o Minor features:
- - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
- more information to it, so that we can track it down in case it
- returns again. Mitigates bug 5235.
- - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
- options_validate(); warn if LearnCircuitBuildTimeout is disabled and
- CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
- - Warn the user when HTTPProxy, but no other proxy type, is
- configured. This can cause surprising behavior: it doesn't send
- all of Tor's traffic over the HTTPProxy -- it sends unencrypted
- directory traffic only. Resolves ticket 4663.
- - Issue a notice if a guard completes less than 40% of your circuits.
- Threshold is configurable by torrc option PathBiasNoticeRate and
- consensus parameter pb_noticepct. There is additional, off-by-
- default code to disable guards which fail too many circuits.
- Addresses ticket 5458.
- - Update to the June 6 2012 Maxmind GeoLite Country database.
- o Code simplifications and refactoring:
- - Remove validate_pluggable_transports_config(): its warning
- message is now handled by connection_or_connect().
- Changes in version 0.2.2.37 - 2012-06-06
- Tor 0.2.2.37 introduces a workaround for a critical renegotiation
- bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
- currently).
- o Major bugfixes:
- - Work around a bug in OpenSSL that broke renegotiation with TLS
- 1.1 and TLS 1.2. Without this workaround, all attempts to speak
- the v2 Tor connection protocol when both sides were using OpenSSL
- 1.0.1 would fail. Resolves ticket 6033.
- - When waiting for a client to renegotiate, don't allow it to add
- any bytes to the input buffer. This fixes a potential DoS issue.
- Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
- - Fix an edge case where if we fetch or publish a hidden service
- descriptor, we might build a 4-hop circuit and then use that circuit
- for exiting afterwards -- even if the new last hop doesn't obey our
- ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes:
- - Fix a build warning with Clang 3.1 related to our use of vasprintf.
- Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
- o Minor features:
- - Tell GCC and Clang to check for any errors in format strings passed
- to the tor_v*(print|scan)f functions.
- Changes in version 0.2.3.16-alpha - 2012-06-05
- Tor 0.2.3.16-alpha introduces a workaround for a critical renegotiation
- bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
- currently). It also fixes a variety of smaller bugs and other cleanups
- that get us closer to a release candidate.
- o Major bugfixes (general):
- - Work around a bug in OpenSSL that broke renegotiation with TLS
- 1.1 and TLS 1.2. Without this workaround, all attempts to speak
- the v2 Tor connection protocol when both sides were using OpenSSL
- 1.0.1 would fail. Resolves ticket 6033.
- - When waiting for a client to renegotiate, don't allow it to add
- any bytes to the input buffer. This fixes a potential DoS issue.
- Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
- - Pass correct OR address to managed proxies (like obfsproxy),
- even when ORListenAddress is used. Fixes bug 4865; bugfix on
- 0.2.3.9-alpha.
- - The advertised platform of a router now includes only its operating
- system's name (e.g., "Linux", "Darwin", "Windows 7"), and not its
- service pack level (for Windows) or its CPU architecture (for Unix).
- We also no longer include the "git-XYZ" tag in the version. Resolves
- part of bug 2988.
- o Major bugfixes (clients):
- - If we are unable to find any exit that supports our predicted ports,
- stop calling them predicted, so that we don't loop and build
- hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
- which introduced predicted ports.
- - Fix an edge case where if we fetch or publish a hidden service
- descriptor, we might build a 4-hop circuit and then use that circuit
- for exiting afterwards -- even if the new last hop doesn't obey our
- ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
- - Check at each new consensus whether our entry guards were picked
- long enough ago that we should rotate them. Previously, we only
- did this check at startup, which could lead to us holding a guard
- indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
- - When fetching a bridge descriptor from a bridge authority,
- always do so anonymously, whether we have been able to open
- circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
- This behavior makes it *safer* to use UpdateBridgesFromAuthority,
- but we'll need to wait for bug 6010 before it's actually usable.
- o Major bugfixes (directory authorities):
- - When computing weight parameters, behave more robustly in the
- presence of a bad bwweightscale value. Previously, the authorities
- would crash if they agreed on a sufficiently broken weight_scale
- value: now, they use a reasonable default and carry on. Partial
- fix for 5786; bugfix on 0.2.2.17-alpha.
- - Check more thoroughly to prevent a rogue authority from
- double-voting on any consensus directory parameter. Previously,
- authorities would crash in this case if the total number of
- votes for any parameter exceeded the number of active voters,
- but would let it pass otherwise. Partial fix for bug 5786; bugfix
- on 0.2.2.2-alpha.
- o Minor features:
- - Rate-limit log messages when asked to connect anonymously to
- a private address. When these hit, they tended to hit fast and
- often. Also, don't bother trying to connect to addresses that we
- are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
- reply makes us think we have been lied to, even when the address the
- client tried to connect to was "localhost." Resolves ticket 2822.
- - Allow packagers to insert an extra string in server descriptor
- platform lines by setting the preprocessor variable TOR_BUILD_TAG.
- Resolves the rest of ticket 2988.
- - Raise the threshold of server descriptors needed (75%) and exit
- server descriptors needed (50%) before we will declare ourselves
- bootstrapped. This will make clients start building circuits a
- little later, but makes the initially constructed circuits less
- skewed and less in conflict with further directory fetches. Fixes
- ticket 3196.
- - Close any connection that sends unrecognized junk before the
- handshake. Solves an issue noted in bug 4369.
- - Improve log messages about managed transports. Resolves ticket 5070.
- - Tag a bridge's descriptor as "never to be sent unencrypted".
- This shouldn't matter, since bridges don't open non-anonymous
- connections to the bridge authority and don't allow unencrypted
- directory connections from clients, but we might as well make
- sure. Closes bug 5139.
- - Expose our view of whether we have gone dormant to the controller,
- via a new "GETINFO dormant" value. Torbutton and other controllers
- can use this to avoid doing periodic requests through Tor while
- it's dormant (bug 4718). Fixes bug 5954.
- - Tell GCC and Clang to check for any errors in format strings passed
- to the tor_v*(print|scan)f functions.
- - Update to the May 1 2012 Maxmind GeoLite Country database.
- o Minor bugfixes (already included in 0.2.2.36):
- - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
- Fixes bug 5346; bugfix on 0.0.8pre3.
- - Correct parsing of certain date types in parse_http_time().
- Without this patch, If-Modified-Since would behave
- incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
- Esteban Manchado Velázques.
- - Make our number-parsing functions always treat too-large values
- as an error, even when those values exceed the width of the
- underlying type. Previously, if the caller provided these
- functions with minima or maxima set to the extreme values of the
- underlying integer type, these functions would return those
- values on overflow rather than treating overflow as an error.
- Fixes part of bug 5786; bugfix on 0.0.9.
- - If we hit the error case where routerlist_insert() replaces an
- existing (old) server descriptor, make sure to remove that
- server descriptor from the old_routers list. Fix related to bug
- 1776. Bugfix on 0.2.2.18-alpha.
- - Clarify the behavior of MaxCircuitDirtiness with hidden service
- circuits. Fixes issue 5259.
- o Minor bugfixes (coding cleanup, on 0.2.2.x and earlier):
- - Prevent a null-pointer dereference when receiving a data cell
- for a nonexistent stream when the circuit in question has an
- empty deliver window. We don't believe this is triggerable,
- since we don't currently allow deliver windows to become empty,
- but the logic is tricky enough that it's better to make the code
- robust. Fixes bug 5541; bugfix on 0.0.2pre14.
- - Fix a memory leak when trying to launch a DNS request when the
- network is disabled or the nameservers are unconfigurable. Fixes
- bug 5916; bugfix on Tor 0.1.2.1-alpha (for the unconfigurable
- nameserver case) and on 0.2.3.9-alpha (for the DisableNetwork case).
- - Don't hold a Windows file handle open for every file mapping;
- the file mapping handle is sufficient. Fixes bug 5951; bugfix on
- 0.1.2.1-alpha.
- - Avoid O(n^2) performance characteristics when parsing a large
- extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
- - Format more doubles with %f, not %lf. Patch from grarpamp to make
- Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
- Tor 0.2.0.8-alpha.
- - Make our replacement implementation of strtok_r() compatible with
- the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
- bugfix on 0.2.2.1-alpha.
- - Fix a NULL-pointer dereference on a badly formed
- SETCIRCUITPURPOSE command. Found by mikeyc. Fixes bug 5796;
- bugfix on 0.2.2.9-alpha.
- - Fix a build warning with Clang 3.1 related to our use of vasprintf.
- Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
- - Defensively refactor rend_mid_rendezvous() so that protocol
- violations and length checks happen in the beginning. Fixes
- bug 5645.
- - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
- that IPv6 stuff will compile on MSVC, and compilation issues
- will be easier to track down. Fixes bug 5861.
- o Minor bugfixes (correctness, on 0.2.2.x and earlier):
- - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
- resource exhaustion, so that clients can adjust their load to
- try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
- started using END_STREAM_REASON_RESOURCELIMIT.
- - Don't check for whether the address we're using for outbound
- connections has changed until after the outbound connection has
- completed. On Windows, getsockname() doesn't succeed until the
- connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
- - If the configuration tries to set MyFamily on a bridge, refuse to
- do so, and warn about the security implications. Fixes bug 4657;
- bugfix on 0.2.0.3-alpha.
- - If the client fails to set a reasonable set of ciphersuites
- during its v2 handshake renegotiation, allow the renegotiation to
- continue nevertheless (i.e. send all the required certificates).
- Fixes bug 4591; bugfix on 0.2.0.20-rc.
- - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
- option is set to 0 (which Vidalia version 0.2.16 now does when
- a SAVECONF attempt fails), perform other actions that SIGHUP
- usually causes (like reopening the logs). Fixes bug 5095; bugfix
- on 0.2.1.9-alpha.
- - If we fail to write a microdescriptor to the disk cache, do not
- continue replacing the old microdescriptor file. Fixes bug 2954;
- bugfix on 0.2.2.6-alpha.
- - Exit nodes don't need to fetch certificates for authorities that
- they don't recognize; only directory authorities, bridges,
- and caches need to do that. Fixes part of bug 2297; bugfix on
- 0.2.2.11-alpha.
- - Correctly handle checking the permissions on the parent
- directory of a control socket in the root directory. Bug found
- by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
- 0.2.2.26-beta.
- - When told to add a bridge with the same digest as a preexisting
- bridge but a different addr:port, change the addr:port as
- requested. Previously we would not notice the change. Fixes half
- of bug 5603; fix on 0.2.2.26-beta.
- - End AUTHCHALLENGE error messages (in the control protocol) with
- a CRLF. Fixes bug 5760; bugfix on 0.2.2.36 and 0.2.3.13-alpha.
- o Minor bugfixes (on 0.2.3.x):
- - Turn an assertion (that the number of handshakes received as a
- server is not < 1) into a warning. Fixes bug 4873; bugfix on
- 0.2.3.1-alpha.
- - Format IPv4 addresses correctly in ADDRMAP events. (Previously,
- we had reversed them when the answer was cached.) Fixes bug
- 5723; bugfix on 0.2.3.1-alpha.
- - Work correctly on Linux systems with accept4 support advertised in
- their headers, but without accept4 support in the kernel. Fix
- by murb. Fixes bug 5762; bugfix on 0.2.3.1-alpha.
- - When told to add a bridge with the same addr:port as a preexisting
- bridge but a different transport, change the transport as
- requested. Previously we would not notice the change. Fixes half
- of bug 5603; fix on 0.2.3.2-alpha.
- - Avoid a "double-reply" warning when replying to a SOCKS request
- with a parse error. Patch from Fabian Keil. Fixes bug 4108;
- bugfix on 0.2.3.4-alpha.
- - Fix a bug where a bridge authority crashes if it has seen no
- directory requests when it's time to write statistics to disk.
- Fixes bug 5891; bugfix on 0.2.3.6-alpha. Also fixes bug 5508 in
- a better way.
- - Don't try to open non-control listeners when DisableNetwork is set.
- Previously, we'd open all listeners, then immediately close them.
- Fixes bug 5604; bugfix on 0.2.3.9-alpha.
- - Don't abort the managed proxy protocol if the managed proxy
- sends us an unrecognized line; ignore it instead. Fixes bug
- 5910; bugfix on 0.2.3.9-alpha.
- - Fix a compile warning in crypto.c when compiling with clang 3.1.
- Fixes bug 5969, bugfix on 0.2.3.9-alpha.
- - Fix a compilation issue on GNU Hurd, which doesn't have PATH_MAX.
- Fixes bug 5355; bugfix on 0.2.3.11-alpha.
- - Remove bogus definition of "_WIN32" from src/win32/orconfig.h, to
- unbreak the MSVC build. Fixes bug 5858; bugfix on 0.2.3.12-alpha.
- - Resolve numerous small warnings and build issues with MSVC. Resolves
- bug 5859.
- o Documentation fixes:
- - Improve the manual's documentation for the NT Service command-line
- options. Addresses ticket 3964.
- - Clarify SessionGroup documentation slightly; resolves ticket 5437.
- - Document the changes to the ORPort and DirPort options, and the
- fact that {OR/Dir}ListenAddress is now unnecessary (and
- therefore deprecated). Resolves ticket 5597.
- o Removed files:
- - Remove the torrc.bridge file: we don't use it for anything, and
- it had become badly desynchronized from torrc.sample. Resolves
- bug 5622.
- Changes in version 0.2.2.36 - 2012-05-24
- Tor 0.2.2.36 updates the addresses for two of the eight directory
- authorities, fixes some potential anonymity and security issues,
- and fixes several crash bugs.
- Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
- known flaws, and nobody should be using them. You should upgrade. If
- you're using a Linux or BSD and its packages are obsolete, stop using
- those packages and upgrade anyway.
- o Directory authority changes:
- - Change IP address for maatuska (v3 directory authority).
- - Change IP address for ides (v3 directory authority), and rename
- it to turtles.
- o Security fixes:
- - When building or running with any version of OpenSSL earlier
- than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
- versions have a bug (CVE-2011-4576) in which their block cipher
- padding includes uninitialized data, potentially leaking sensitive
- information to any peer with whom they make a SSLv3 connection. Tor
- does not use SSL v3 by default, but a hostile client or server
- could force an SSLv3 connection in order to gain information that
- they shouldn't have been able to get. The best solution here is to
- upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
- or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
- to make sure that the bug can't happen.
- - Never use a bridge or a controller-supplied node as an exit, even
- if its exit policy allows it. Found by wanoskarnet. Fixes bug
- 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
- and 0.2.0.3-alpha (for bridge-purpose descriptors).
- - Only build circuits if we have a sufficient threshold of the total
- descriptors that are marked in the consensus with the "Exit"
- flag. This mitigates an attack proposed by wanoskarnet, in which
- all of a client's bridges collude to restrict the exit nodes that
- the client knows about. Fixes bug 5343.
- - Provide controllers with a safer way to implement the cookie
- authentication mechanism. With the old method, if another locally
- running program could convince a controller that it was the Tor
- process, then that program could trick the controller into telling
- it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
- authentication method uses a challenge-response approach to prevent
- this attack. Fixes bug 5185; implements proposal 193.
- o Major bugfixes:
- - Avoid logging uninitialized data when unable to decode a hidden
- service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
- - Avoid a client-side assertion failure when receiving an INTRODUCE2
- cell on a general purpose circuit. Fixes bug 5644; bugfix on
- 0.2.1.6-alpha.
- - Fix builds when the path to sed, openssl, or sha1sum contains
- spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
- on 0.2.2.1-alpha.
- - Correct our replacements for the timeradd() and timersub() functions
- on platforms that lack them (for example, Windows). The timersub()
- function is used when expiring circuits, while timeradd() is
- currently unused. Bug report and patch by Vektor. Fixes bug 4778;
- bugfix on 0.2.2.24-alpha.
- - Fix the SOCKET_OK test that we use to tell when socket
- creation fails so that it works on Win64. Fixes part of bug 4533;
- bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
- o Minor bugfixes:
- - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
- Fixes bug 5346; bugfix on 0.0.8pre3.
- - Make our number-parsing functions always treat too-large values
- as an error, even when those values exceed the width of the
- underlying type. Previously, if the caller provided these
- functions with minima or maxima set to the extreme values of the
- underlying integer type, these functions would return those
- values on overflow rather than treating overflow as an error.
- Fixes part of bug 5786; bugfix on 0.0.9.
- - Older Linux kernels erroneously respond to strange nmap behavior
- by having accept() return successfully with a zero-length
- socket. When this happens, just close the connection. Previously,
- we would try harder to learn the remote address: but there was
- no such remote address to learn, and our method for trying to
- learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
- on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
- - Correct parsing of certain date types in parse_http_time().
- Without this patch, If-Modified-Since would behave
- incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
- Esteban Manchado Velázques.
- - Change the BridgePassword feature (part of the "bridge community"
- design, which is not yet implemented) to use a time-independent
- comparison. The old behavior might have allowed an adversary
- to use timing to guess the BridgePassword value. Fixes bug 5543;
- bugfix on 0.2.0.14-alpha.
- - Detect and reject certain misformed escape sequences in
- configuration values. Previously, these values would cause us
- to crash if received in a torrc file or over an authenticated
- control port. Bug found by Esteban Manchado Velázquez, and
- independently by Robert Connolly from Matta Consulting who further
- noted that it allows a post-authentication heap overflow. Patch
- by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
- bugfix on 0.2.0.16-alpha.
- - Fix a compile warning when using the --enable-openbsd-malloc
- configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
- - During configure, detect when we're building with clang version
- 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
- CFLAGS. clang doesn't support them yet.
- - When sending an HTTP/1.1 proxy request, include a Host header.
- Fixes bug 5593; bugfix on 0.2.2.1-alpha.
- - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
- command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
- - If we hit the error case where routerlist_insert() replaces an
- existing (old) server descriptor, make sure to remove that
- server descriptor from the old_routers list. Fix related to bug
- 1776. Bugfix on 0.2.2.18-alpha.
- o Minor bugfixes (documentation and log messages):
- - Fix a typo in a log message in rend_service_rendezvous_has_opened().
- Fixes bug 4856; bugfix on Tor 0.0.6.
- - Update "ClientOnly" man page entry to explain that there isn't
- really any point to messing with it. Resolves ticket 5005.
- - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
- directory authority option (introduced in Tor 0.2.2.34).
- - Downgrade the "We're missing a certificate" message from notice
- to info: people kept mistaking it for a real problem, whereas it
- is seldom the problem even when we are failing to bootstrap. Fixes
- bug 5067; bugfix on 0.2.0.10-alpha.
- - Correctly spell "connect" in a log message on failure to create a
- controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
- - Clarify the behavior of MaxCircuitDirtiness with hidden service
- circuits. Fixes issue 5259.
- o Minor features:
- - Directory authorities now reject versions of Tor older than
- 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
- inclusive. These versions accounted for only a small fraction of
- the Tor network, and have numerous known security issues. Resolves
- issue 4788.
- - Update to the May 1 2012 Maxmind GeoLite Country database.
- - Feature removal:
- - When sending or relaying a RELAY_EARLY cell, we used to convert
- it to a RELAY cell if the connection was using the v1 link
- protocol. This was a workaround for older versions of Tor, which
- didn't handle RELAY_EARLY cells properly. Now that all supported
- versions can handle RELAY_EARLY cells, and now that we're enforcing
- the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
- remove this workaround. Addresses bug 4786.
- Changes in version 0.2.3.15-alpha - 2012-04-30
- Tor 0.2.3.15-alpha fixes a variety of smaller bugs, including making
- the development branch build on Windows again.
- o Minor bugfixes (on 0.2.2.x and earlier):
- - Make sure that there are no unhandled pending TLS errors before
- reading from a TLS stream. We had checks in 0.1.0.3-rc, but
- lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
- Bugfix on 0.1.0.5-rc; fixes bug 4528.
- - Fix an assert that directory authorities could trigger on sighup
- during some configuration state transitions. We now don't treat
- it as a fatal error when the new descriptor we just generated in
- init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
- - After we pick a directory mirror, we would refuse to use it if
- it's in our ExcludeExitNodes list, resulting in mysterious failures
- to bootstrap for people who just wanted to avoid exiting from
- certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
- - When building with --enable-static-tor on OpenBSD, do not
- erroneously attempt to link -lrt. Fixes bug 5103.
- o Minor bugfixes (on 0.2.3.x):
- - When Tor is built with kernel headers from a recent (last few
- years) Linux kernel, do not fail to run on older (pre-2.6.28
- Linux kernels). Fixes bug 5112; bugfix on 0.2.3.1-alpha.
- - Fix cross-compilation issues with mingw. Bugfixes on 0.2.3.6-alpha
- and 0.2.3.12-alpha.
- - Fix compilation with miniupnpc version 1.6; patch from
- Anthony G. Basile. Fixes bug 5434; bugfix on 0.2.3.12-alpha.
- - Fix compilation with MSVC, which had defined MS_WINDOWS. Bugfix
- on 0.2.3.13-alpha; found and fixed by Gisle Vanem.
- - Fix compilation on platforms without unistd.h, or where environ
- is defined in stdlib.h. Fixes bug 5704; bugfix on 0.2.3.13-alpha.
- o Minor features:
- - Directory authorities are now a little more lenient at accepting
- older router descriptors, or newer router descriptors that don't
- make big changes. This should help ameliorate past and future
- issues where routers think they have uploaded valid descriptors,
- but the authorities don't think so. Fix for ticket 2479.
- - Make the code that clients use to detect an address change be
- IPv6-aware, so that it won't fill clients' logs with error
- messages when trying to get the IPv4 address of an IPv6
- connection. Implements ticket 5537.
- o Removed features:
- - Remove the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays option;
- authorities needed to use it for a while to keep the network working
- as people upgraded to 0.2.1.31, 0.2.2.34, or 0.2.3.6-alpha, but
- that was six months ago. As of now, it should no longer be needed
- or used.
- Changes in version 0.2.3.14-alpha - 2012-04-23
- Tor 0.2.3.14-alpha fixes yet more bugs to get us closer to a release
- candidate. It also dramatically speeds up AES: fast relays should
- consider switching to the newer OpenSSL library.
- o Directory authority changes:
- - Change IP address for ides (v3 directory authority), and rename
- it to turtles.
- o Major bugfixes:
- - Avoid logging uninitialized data when unable to decode a hidden
- service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
- - Avoid a client-side assertion failure when receiving an INTRODUCE2
- cell on a general purpose circuit. Fixes bug 5644; bugfix on
- 0.2.1.6-alpha.
- - If authorities are unable to get a v2 consensus document from other
- directory authorities, they no longer fall back to fetching
- them from regular directory caches. Fixes bug 5635; bugfix on
- 0.2.2.26-beta, where routers stopped downloading v2 consensus
- documents entirely.
- - When we start a Tor client with a normal consensus already cached,
- be willing to download a microdescriptor consensus. Fixes bug 4011;
- fix on 0.2.3.1-alpha.
- o Major features (performance):
- - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
- instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
- vectorized AES implementations as appropriate. These can be much,
- much faster than other AES implementations.
- o Minor bugfixes (0.2.2.x and earlier):
- - Don't launch more than 10 service-side introduction-point circuits
- for a hidden service in five minutes. Previously, we would consider
- launching more introduction-point circuits if at least one second
- had passed without any introduction-point circuits failing. Fixes
- bug 4607; bugfix on 0.0.7pre1.
- - Change the BridgePassword feature (part of the "bridge community"
- design, which is not yet implemented) to use a time-independent
- comparison. The old behavior might have allowed an adversary
- to use timing to guess the BridgePassword value. Fixes bug 5543;
- bugfix on 0.2.0.14-alpha.
- - Enforce correct return behavior of tor_vsscanf() when the '%%'
- pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
- - When sending an HTTP/1.1 proxy request, include a Host header.
- Fixes bug 5593; bugfix on 0.2.2.1-alpha.
- - Don't log that we have "decided to publish new relay descriptor"
- unless we are actually publishing a descriptor. Fixes bug 3942;
- bugfix on 0.2.2.28-beta.
- o Minor bugfixes (0.2.3.x):
- - Fix a bug where a bridge authority crashes (on a failed assert)
- if it has seen no directory requests when it's time to write
- statistics to disk. Fixes bug 5508. Bugfix on 0.2.3.6-alpha.
- - Fix bug stomping on ORPort option NoListen and ignoring option
- NoAdvertise. Fixes bug 5151; bugfix on 0.2.3.9-alpha.
- - In the testsuite, provide a large enough buffer in the tor_sscanf
- unit test. Otherwise we'd overrun that buffer and crash during
- the unit tests. Found by weasel. Fixes bug 5449; bugfix on
- 0.2.3.12-alpha.
- - Make sure we create the keys directory if it doesn't exist and we're
- about to store the dynamic Diffie-Hellman parameters. Fixes bug
- 5572; bugfix on 0.2.3.13-alpha.
- - Fix a small memory leak when trying to decode incorrect base16
- authenticator during SAFECOOKIE authentication. Found by
- Coverity Scan. Fixes CID 507. Bugfix on 0.2.3.13-alpha.
- o Minor features:
- - Add more information to a log statement that might help track down
- bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
- non-IP address" messages (or any Bug messages, for that matter!),
- please let us know about it.
- - Relays now understand an IPv6 address when they get one from a
- directory server. Resolves ticket 4875.
- - Resolve IPv6 addresses in bridge and entry statistics to country
- code "??" which means we at least count them. Resolves ticket 5053;
- improves on 0.2.3.9-alpha.
- - Update to the April 3 2012 Maxmind GeoLite Country database.
- - Begin a doc/state-contents.txt file to explain the contents of
- the Tor state file. Fixes bug 2987.
- o Default torrc changes:
- - Stop listing "socksport 9050" in torrc.sample. We open a socks
- port on 9050 by default anyway, so this should not change anything
- in practice.
- - Stop mentioning the deprecated *ListenAddress options in
- torrc.sample. Fixes bug 5438.
- - Document unit of bandwidth related options in sample torrc.
- Fixes bug 5621.
- o Removed features:
- - The "torify" script no longer supports the "tsocks" socksifier
- tool, since tsocks doesn't support DNS and UDP right for Tor.
- Everyone should be using torsocks instead. Fixes bugs 3530 and
- 5180. Based on a patch by "ugh".
- o Code refactoring:
- - Change the symmetric cipher interface so that creating and
- initializing a stream cipher are no longer separate functions.
- - Remove all internal support for unpadded RSA. We never used it, and
- it would be a bad idea to start.
- Changes in version 0.2.3.13-alpha - 2012-03-26
- Tor 0.2.3.13-alpha fixes a variety of stability and correctness bugs
- in managed pluggable transports, as well as providing other cleanups
- that get us closer to a release candidate.
- o Directory authority changes:
- - Change IP address for maatuska (v3 directory authority).
- o Security fixes:
- - Provide controllers with a safer way to implement the cookie
- authentication mechanism. With the old method, if another locally
- running program could convince a controller that it was the Tor
- process, then that program could trick the controller into telling
- it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
- authentication method uses a challenge-response approach to prevent
- this attack. Fixes bug 5185, implements proposal 193.
- - Never use a bridge or a controller-supplied node as an exit, even
- if its exit policy allows it. Found by wanoskarnet. Fixes bug
- 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
- and 0.2.0.3-alpha (for bridge-purpose descriptors).
- - Only build circuits if we have a sufficient threshold of the total
- descriptors that are marked in the consensus with the "Exit"
- flag. This mitigates an attack proposed by wanoskarnet, in which
- all of a client's bridges collude to restrict the exit nodes that
- the client knows about. Fixes bug 5343.
- o Major bugfixes (on Tor 0.2.3.x):
- - Avoid an assert when managed proxies like obfsproxy are configured,
- and we receive HUP signals or setconf attempts too rapidly. This
- situation happens most commonly when Vidalia tries to attach to
- Tor or tries to configure the Tor it's attached to. Fixes bug 5084;
- bugfix on 0.2.3.6-alpha.
- - Fix a relay-side pluggable transports bug where managed proxies were
- unreachable from the Internet, because Tor asked them to bind on
- localhost. Fixes bug 4725; bugfix on 0.2.3.9-alpha.
- - Stop discarding command-line arguments when TestingTorNetwork
- is set. Discovered by Kevin Bauer. Fixes bug 5373; bugfix on
- 0.2.3.9-alpha, where task 4552 added support for two layers of
- torrc files.
- - Resume allowing the unit tests to run in gdb. This was accidentally
- made impossible when the DisableDebuggerAttachment option was
- introduced. Fixes bug 5448; bugfix on 0.2.3.9-alpha.
- - Resume building with nat-pmp support. Fixes bug 4955; bugfix on
- 0.2.3.11-alpha. Reported by Anthony G. Basile.
- o Minor bugfixes (on 0.2.2.x and earlier):
- - Ensure we don't cannibalize circuits that are longer than three hops
- already, so we don't end up making circuits with 5 or more
- hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
- 0.1.0.1-rc which introduced cannibalization.
- - Detect and reject certain misformed escape sequences in
- configuration values. Previously, these values would cause us
- to crash if received in a torrc file or over an authenticated
- control port. Bug found by Esteban Manchado Velázquez, and
- independently by Robert Connolly from Matta Consulting who further
- noted that it allows a post-authentication heap overflow. Patch
- by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
- bugfix on 0.2.0.16-alpha.
- - Fix a compile warning when using the --enable-openbsd-malloc
- configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
- - Directory caches no longer refuse to clean out descriptors because
- of missing v2 networkstatus documents, unless they're configured
- to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
- 0.2.2.26-beta. Patch by Daniel Bryg.
- - Update to the latest version of the tinytest unit testing framework.
- This includes a couple of bugfixes that can be relevant for
- running forked unit tests on Windows, and removes all reserved
- identifiers.
- o Minor bugfixes (on 0.2.3.x):
- - On a failed pipe() call, don't leak file descriptors. Fixes bug
- 4296; bugfix on 0.2.3.1-alpha.
- - Spec conformance: on a v3 handshake, do not send a NETINFO cell
- until after we have received a CERTS cell. Fixes bug 4361; bugfix
- on 0.2.3.6-alpha. Patch by "frosty".
- - When binding to an IPv6 address, set the IPV6_V6ONLY socket
- option, so that the IP stack doesn't decide to use it for IPv4
- too. Fixes bug 4760; bugfix on 0.2.3.9-alpha.
- - Ensure that variables set in Tor's environment cannot override
- environment variables that Tor passes to a managed
- pluggable-transport proxy. Previously, Tor would pass every
- variable in its environment to managed proxies along with the new
- ones, in such a way that on many operating systems, the inherited
- environment variables would override those which Tor tried to
- explicitly set. Bugfix on 0.2.3.12-alpha for most Unixoid systems;
- bugfix on 0.2.3.9-alpha for Windows.
- o Minor features:
- - A wide variety of new unit tests by Esteban Manchado Velázquez.
- - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
- - Update to the March 6 2012 Maxmind GeoLite Country database.
- Changes in version 0.2.3.12-alpha - 2012-02-13
- Tor 0.2.3.12-alpha lets fast exit relays scale better, allows clients
- to use bridges that run Tor 0.2.2.x, and resolves several big bugs
- when Tor is configured to use a pluggable transport like obfsproxy.
- o Major bugfixes:
- - Fix builds when the path to sed, openssl, or sha1sum contains
- spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
- on 0.2.2.1-alpha.
- - Set the SO_REUSEADDR socket option before we call bind() on outgoing
- connections. This change should allow busy exit relays to stop
- running out of available sockets as quickly. Fixes bug 4950;
- bugfix on 0.2.2.26-beta.
- - Allow 0.2.3.x clients to use 0.2.2.x bridges. Previously the client
- would ask the bridge for microdescriptors, which are only supported
- in 0.2.3.x, and then fail to bootstrap when it didn't get the
- answers it wanted. Fixes bug 4013; bugfix on 0.2.3.2-alpha.
- - Properly set up obfsproxy's environment when in managed mode. The
- Tor Browser Bundle needs LD_LIBRARY_PATH to be passed to obfsproxy,
- and when you run your Tor as a daemon, there's no HOME. Fixes bugs
- 5076 and 5082; bugfix on 0.2.3.6-alpha.
- o Minor features:
- - Use the dead_strip option when building Tor on OS X. This reduces
- binary size by almost 19% when linking openssl and libevent
- statically, which we do for Tor Browser Bundle.
- - Fix broken URLs in the sample torrc file, and tell readers about
- the OutboundBindAddress, ExitPolicyRejectPrivate, and
- PublishServerDescriptor options. Addresses bug 4652.
- - Update to the February 7 2012 Maxmind GeoLite Country database.
- o Minor bugfixes:
- - Downgrade the "We're missing a certificate" message from notice
- to info: people kept mistaking it for a real problem, whereas it
- is seldom the problem even when we are failing to bootstrap. Fixes
- bug 5067; bugfix on 0.2.0.10-alpha.
- - Don't put "TOR_PT_EXTENDED_SERVER_PORT=127.0.0.1:4200" in a
- managed pluggable transport server proxy's environment.
- Previously, we would put it there, even though Tor doesn't
- implement an 'extended server port' yet, and even though Tor
- almost certainly isn't listening at that address. For now, we set
- it to an empty string to avoid crashing older obfsproxies. Bugfix
- on 0.2.3.6-alpha.
- - Log the heartbeat message every HeartbeatPeriod seconds, not every
- HeartbeatPeriod + 1 seconds. Fixes bug 4942; bugfix on
- 0.2.3.1-alpha. Bug reported by Scott Bennett.
- - Calculate absolute paths correctly on Windows. Fixes bug 4973;
- bugfix on 0.2.3.11-alpha.
- - Update "ClientOnly" man page entry to explain that there isn't
- really any point to messing with it. Resolves ticket 5005.
- - Use the correct CVE number for CVE-2011-4576 in our comments and
- log messages. Found by "fermenthor". Resolves bug 5066; bugfix on
- 0.2.3.11-alpha.
- o Code simplifications and refactoring:
- - Use the _WIN32 macro throughout our code to detect Windows.
- (Previously we had used the obsolete 'WIN32' and the idiosyncratic
- 'MS_WINDOWS'.)
- Changes in version 0.2.3.11-alpha - 2012-01-22
- Tor 0.2.3.11-alpha marks feature-freeze for the 0.2.3 tree. It deploys
- the last step of the plan to limit maximum circuit length, includes
- a wide variety of hidden service performance and correctness fixes,
- works around an OpenSSL security flaw if your distro is too stubborn
- to upgrade, and fixes a bunch of smaller issues.
- o Major features:
- - Now that Tor 0.2.0.x is completely deprecated, enable the final
- part of "Proposal 110: Avoiding infinite length circuits" by
- refusing all circuit-extend requests that do not use a relay_early
- cell. This change helps Tor resist a class of denial-of-service
- attacks by limiting the maximum circuit length.
- - Adjust the number of introduction points that a hidden service
- will try to maintain based on how long its introduction points
- remain in use and how many introductions they handle. Fixes
- part of bug 3825.
- - Try to use system facilities for enumerating local interface
- addresses, before falling back to our old approach (which was
- binding a UDP socket, and calling getsockname() on it). That
- approach was scaring OS X users whose draconian firewall
- software warned about binding to UDP sockets, regardless of
- whether packets were sent. Now we try to use getifaddrs(),
- SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
- system supports. Resolves ticket 1827.
- o Major security workaround:
- - When building or running with any version of OpenSSL earlier
- than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
- versions have a bug (CVE-2011-4576) in which their block cipher
- padding includes uninitialized data, potentially leaking sensitive
- information to any peer with whom they make a SSLv3 connection. Tor
- does not use SSL v3 by default, but a hostile client or server
- could force an SSLv3 connection in order to gain information that
- they shouldn't have been able to get. The best solution here is to
- upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
- or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
- to make sure that the bug can't happen.
- o Major bugfixes:
- - Fix the SOCKET_OK test that we use to tell when socket
- creation fails so that it works on Win64. Fixes part of bug 4533;
- bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
- - Correct our replacements for the timeradd() and timersub() functions
- on platforms that lack them (for example, Windows). The timersub()
- function is used when expiring circuits, while timeradd() is
- currently unused. Bug report and patch by Vektor. Fixes bug 4778;
- bugfix on 0.2.2.24-alpha and 0.2.3.1-alpha.
- - Do not use OpenSSL 1.0.0's counter mode: it has a critical bug
- that was fixed in OpenSSL 1.0.0a. We test for the counter mode
- bug at runtime, not compile time, because some distributions hack
- their OpenSSL to mis-report its version. Fixes bug 4779; bugfix
- on 0.2.3.9-alpha. Found by Pascal.
- o Minor features (controller):
- - Use absolute path names when reporting the torrc filename in the
- control protocol, so a controller can more easily find the torrc
- file. Resolves bug 1101.
- - Extend the control protocol to report flags that control a circuit's
- path selection in CIRC events and in replies to 'GETINFO
- circuit-status'. Implements part of ticket 2411.
- - Extend the control protocol to report the hidden service address
- and current state of a hidden-service-related circuit in CIRC
- events and in replies to 'GETINFO circuit-status'. Implements part
- of ticket 2411.
- - When reporting the path to the cookie file to the controller,
- give an absolute path. Resolves ticket 4881.
- - Allow controllers to request an event notification whenever a
- circuit is cannibalized or its purpose is changed. Implements
- part of ticket 3457.
- - Include the creation time of a circuit in CIRC and CIRC2
- control-port events and the list produced by the 'GETINFO
- circuit-status' control-port command.
- o Minor features (directory authorities):
- - Directory authorities now reject versions of Tor older than
- 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
- inclusive. These versions accounted for only a small fraction of
- the Tor network, and have numerous known security issues. Resolves
- issue 4788.
- - Authority operators can now vote for all relays in a given
- set of countries to be BadDir/BadExit/Invalid/Rejected.
- - Provide two consensus parameters (FastFlagMinThreshold and
- FastFlagMaxThreshold) to control the range of allowable bandwidths
- for the Fast directory flag. These allow authorities to run
- experiments on appropriate requirements for being a "Fast" node.
- The AuthDirFastGuarantee config value still applies. Implements
- ticket 3946.
- - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
- directory authority option (introduced in Tor 0.2.2.34).
- o Minor features (other):
- - Don't disable the DirPort when we cannot exceed our AccountingMax
- limit during this interval because the effective bandwidthrate is
- low enough. This is useful in a situation where AccountMax is only
- used as an additional safeguard or to provide statistics.
- - Prepend an informative header to generated dynamic_dh_params files.
- - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
- EntryNodes will have no effect. Resolves issue 2571.
- - Log more useful messages when we fail to disable debugger
- attachment.
- - Log which authority we're missing votes from when we go to fetch
- them from the other auths.
- - Log (at debug level) whenever a circuit's purpose is changed.
- - Add missing documentation for the MaxClientCircuitsPending,
- UseMicrodescriptors, UserspaceIOCPBuffers, and
- _UseFilteringSSLBufferevents options, all introduced during
- the 0.2.3.x series.
- - Update to the January 3 2012 Maxmind GeoLite Country database.
- o Minor bugfixes (hidden services):
- - Don't close hidden service client circuits which have almost
- finished connecting to their destination when they reach
- the normal circuit-build timeout. Previously, we would close
- introduction circuits which are waiting for an acknowledgement
- from the introduction point, and rendezvous circuits which have
- been specified in an INTRODUCE1 cell sent to a hidden service,
- after the normal CBT. Now, we mark them as 'timed out', and launch
- another rendezvous attempt in parallel. This behavior change can
- be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
- option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
- - Don't close hidden-service-side rendezvous circuits when they
- reach the normal circuit-build timeout. This behavior change can
- be disabled using the new
- CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
- remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
- - Make sure we never mark the wrong rendezvous circuit as having
- had its introduction cell acknowledged by the introduction-point
- relay. Previously, when we received an INTRODUCE_ACK cell on a
- client-side hidden-service introduction circuit, we might have
- marked a rendezvous circuit other than the one we specified in
- the INTRODUCE1 cell as INTRO_ACKED, which would have produced
- a warning message and interfered with the hidden service
- connection-establishment process. Fixes bug 4759; bugfix on
- 0.2.3.3-alpha, when we added the stream-isolation feature which
- might cause Tor to open multiple rendezvous circuits for the same
- hidden service.
- - Don't trigger an assertion failure when we mark a new client-side
- hidden-service introduction circuit for close during the process
- of creating it. Fixes bug 4796; bugfix on 0.2.3.6-alpha. Reported
- by murb.
- o Minor bugfixes (log messages):
- - Correctly spell "connect" in a log message on failure to create a
- controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta and
- 0.2.3.2-alpha.
- - Fix a typo in a log message in rend_service_rendezvous_has_opened().
- Fixes bug 4856; bugfix on Tor 0.0.6.
- - Fix the log message describing how we work around discovering
- that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
- 4837; bugfix on 0.2.2.9-alpha.
- - When logging about a disallowed .exit name, do not also call it
- an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
- o Minor bugfixes (build fixes):
- - During configure, detect when we're building with clang version
- 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
- CFLAGS. clang doesn't support them yet.
- - During configure, search for library containing cos function as
- libm lives in libcore on some platforms (BeOS/Haiku). Linking
- against libm was hard-coded before. Fixes the first part of bug
- 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
- Pedersen.
- - Detect attempts to build Tor on (as yet hypothetical) versions
- of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
- fix for bug 4533. Bugfix on 0.2.2.28-beta.
- - Preprocessor directives should not be put inside the arguments
- of a macro. This would break compilation with GCC releases prior
- to version 3.3. We would never recommend such an old GCC version,
- but it is apparently required for binary compatibility on some
- platforms (namely, certain builds of Haiku). Fixes the other part
- of bug 4727; bugfix on 0.2.3.3-alpha. Patch and analysis by Martin
- Hebnes Pedersen.
- o Minor bugfixes (other):
- - Older Linux kernels erroneously respond to strange nmap behavior
- by having accept() return successfully with a zero-length
- socket. When this happens, just close the connection. Previously,
- we would try harder to learn the remote address: but there was
- no such remote address to learn, and our method for trying to
- learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
- on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
- - Fix null-pointer access that could occur if TLS allocation failed.
- Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un". This was
- erroneously listed as fixed in 0.2.3.9-alpha, but the fix had
- accidentally been reverted.
- - Fix our implementation of crypto_random_hostname() so it can't
- overflow on ridiculously large inputs. (No Tor version has ever
- provided this kind of bad inputs, but let's be correct in depth.)
- Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
- - Find more places in the code that should have been testing for
- invalid sockets using the SOCKET_OK macro. Required for a fix
- for bug 4533. Bugfix on 0.2.2.28-beta.
- - Fix an assertion failure when, while running with bufferevents, a
- connection finishes connecting after it is marked for close, but
- before it is closed. Fixes bug 4697; bugfix on 0.2.3.1-alpha.
- - test_util_spawn_background_ok() hardcoded the expected value
- for ENOENT to 2. This isn't portable as error numbers are
- platform specific, and particularly the hurd has ENOENT at
- 0x40000002. Construct expected string at runtime, using the correct
- value for ENOENT. Fixes bug 4733; bugfix on 0.2.3.1-alpha.
- - Reject attempts to disable DisableDebuggerAttachment while Tor is
- running. Fixes bug 4650; bugfix on 0.2.3.9-alpha.
- - Use an appropriate-width type for sockets in tor-fw-helper on
- win64. Fixes bug 1983 at last. Bugfix on 0.2.3.9-alpha.
- o Feature removal:
- - When sending or relaying a RELAY_EARLY cell, we used to convert
- it to a RELAY cell if the connection was using the v1 link
- protocol. This was a workaround for older versions of Tor, which
- didn't handle RELAY_EARLY cells properly. Now that all supported
- versions can handle RELAY_EARLY cells, and now that we're enforcing
- the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
- remove this workaround. Addresses bug 4786.
- o Code simplifications and refactoring:
- - Use OpenSSL's built-in SSL_state_string_long() instead of our
- own homebrewed ssl_state_to_string() replacement. Patch from
- Emile Snyder. Fixes bug 4653.
- - Use macros to indicate OpenSSL versions, so we don't need to worry
- about accidental hexadecimal bit shifts.
- - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
- supported).
- - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
- - Use the smartlist_add_asprintf() alias more consistently.
- - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
- invalid value, rather than just -1.
- - Rename a handful of old identifiers, mostly related to crypto
- structures and crypto functions. By convention, our "create an
- object" functions are called "type_new()", our "free an object"
- functions are called "type_free()", and our types indicate that
- they are types only with a final "_t". But a handful of older
- types and functions broke these rules, with function names like
- "type_create" or "subsystem_op_type", or with type names like
- type_env_t.
- Changes in version 0.2.3.10-alpha - 2011-12-16
- Tor 0.2.3.10-alpha fixes a critical heap-overflow security issue in
- Tor's buffers code. Absolutely everybody should upgrade.
- The bug relied on an incorrect calculation when making data continuous
- in one of our IO buffers, if the first chunk of the buffer was
- misaligned by just the wrong amount. The miscalculation would allow an
- attacker to overflow a piece of heap-allocated memory. To mount this
- attack, the attacker would need to either open a SOCKS connection to
- Tor's SocksPort (usually restricted to localhost), or target a Tor
- instance configured to make its connections through a SOCKS proxy
- (which Tor does not do by default).
- Good security practice requires that all heap-overflow bugs should be
- presumed to be exploitable until proven otherwise, so we are treating
- this as a potential code execution attack. Please upgrade immediately!
- This bug does not affect bufferevents-based builds of Tor. Special
- thanks to "Vektor" for reporting this issue to us!
- This release also contains a few minor bugfixes for issues discovered
- in 0.2.3.9-alpha.
- o Major bugfixes:
- - Fix a heap overflow bug that could occur when trying to pull
- data into the first chunk of a buffer, when that chunk had
- already had some data drained from it. Fixes CVE-2011-2778;
- bugfix on 0.2.0.16-alpha. Reported by "Vektor".
- o Minor bugfixes:
- - If we can't attach streams to a rendezvous circuit when we
- finish connecting to a hidden service, clear the rendezvous
- circuit's stream-isolation state and try to attach streams
- again. Previously, we cleared rendezvous circuits' isolation
- state either too early (if they were freshly built) or not at all
- (if they had been built earlier and were cannibalized). Bugfix on
- 0.2.3.3-alpha; fixes bug 4655.
- - Fix compilation of the libnatpmp helper on non-Windows. Bugfix on
- 0.2.3.9-alpha; fixes bug 4691. Reported by Anthony G. Basile.
- - Fix an assertion failure when a relay with accounting enabled
- starts up while dormant. Fixes bug 4702; bugfix on 0.2.3.9-alpha.
- o Minor features:
- - Update to the December 6 2011 Maxmind GeoLite Country database.
- Changes in version 0.2.2.35 - 2011-12-16
- Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
- buffers code. Absolutely everybody should upgrade.
- The bug relied on an incorrect calculation when making data continuous
- in one of our IO buffers, if the first chunk of the buffer was
- misaligned by just the wrong amount. The miscalculation would allow an
- attacker to overflow a piece of heap-allocated memory. To mount this
- attack, the attacker would need to either open a SOCKS connection to
- Tor's SocksPort (usually restricted to localhost), or target a Tor
- instance configured to make its connections through a SOCKS proxy
- (which Tor does not do by default).
- Good security practice requires that all heap-overflow bugs should be
- presumed to be exploitable until proven otherwise, so we are treating
- this as a potential code execution attack. Please upgrade immediately!
- This bug does not affect bufferevents-based builds of Tor. Special
- thanks to "Vektor" for reporting this issue to us!
- Tor 0.2.2.35 also fixes several bugs in previous versions, including
- crash bugs for unusual configurations, and a long-term bug that
- would prevent Tor from starting on Windows machines with draconian
- AV software.
- With this release, we remind everyone that 0.2.0.x has reached its
- formal end-of-life. Those Tor versions have many known flaws, and
- nobody should be using them. You should upgrade -- ideally to the
- 0.2.2.x series. If you're using a Linux or BSD and its packages are
- obsolete, stop using those packages and upgrade anyway.
- The Tor 0.2.1.x series is also approaching its end-of-life: it will no
- longer receive support after some time in early 2012.
- o Major bugfixes:
- - Fix a heap overflow bug that could occur when trying to pull
- data into the first chunk of a buffer, when that chunk had
- already had some data drained from it. Fixes CVE-2011-2778;
- bugfix on 0.2.0.16-alpha. Reported by "Vektor".
- - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
- that it doesn't attempt to allocate a socketpair. This could cause
- some problems on Windows systems with overzealous firewalls. Fix for
- bug 4457; workaround for Libevent versions 2.0.1-alpha through
- 2.0.15-stable.
- - If we mark an OR connection for close based on a cell we process,
- don't process any further cells on it. We already avoid further
- reads on marked-for-close connections, but now we also discard the
- cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
- which was the first version where we might mark a connection for
- close based on processing a cell on it.
- - Correctly sanity-check that we don't underflow on a memory
- allocation (and then assert) for hidden service introduction
- point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
- bugfix on 0.2.1.5-alpha.
- - Fix a memory leak when we check whether a hidden service
- descriptor has any usable introduction points left. Fixes bug
- 4424. Bugfix on 0.2.2.25-alpha.
- - Don't crash when we're running as a relay and don't have a GeoIP
- file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
- we've had in the 0.2.3.x branch already.
- - When running as a client, do not print a misleading (and plain
- wrong) log message that we're collecting "directory request"
- statistics: clients don't collect statistics. Also don't create a
- useless (because empty) stats file in the stats/ directory. Fixes
- bug 4353; bugfix on 0.2.2.34.
- o Minor bugfixes:
- - Detect failure to initialize Libevent. This fix provides better
- detection for future instances of bug 4457.
- - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
- function. This was eating up hideously large amounts of time on some
- busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
- - Resolve an integer overflow bug in smartlist_ensure_capacity().
- Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
- Mansour Moufid.
- - Don't warn about unused log_mutex in log.c when building with
- --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
- 0.1.0.6-rc which introduced --disable-threads.
- - When configuring, starting, or stopping an NT service, stop
- immediately after the service configuration attempt has succeeded
- or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
- - When sending a NETINFO cell, include the original address
- received for the other side, not its canonical address. Found
- by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
- - Fix a typo in a hibernation-related log message. Fixes bug 4331;
- bugfix on 0.2.2.23-alpha; found by "tmpname0901".
- - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
- occurred when a client tried to fetch a descriptor for a bridge
- in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
- - Backport fixes for a pair of compilation warnings on Windows.
- Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
- - If we had ever tried to call tor_addr_to_str on an address of
- unknown type, we would have done a strdup on an uninitialized
- buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
- Reported by "troll_un".
- - Correctly detect and handle transient lookup failures from
- tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
- Reported by "troll_un".
- - Fix null-pointer access that could occur if TLS allocation failed.
- Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
- - Use tor_socket_t type for listener argument to accept(). Fixes bug
- 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
- o Minor features:
- - Add two new config options for directory authorities:
- AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
- Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
- that is always sufficient to satisfy the bandwidth requirement for
- the Guard flag. Now it will be easier for researchers to simulate
- Tor networks with different values. Resolves ticket 4484.
- - When Tor ignores a hidden service specified in its configuration,
- include the hidden service's directory in the warning message.
- Previously, we would only tell the user that some hidden service
- was ignored. Bugfix on 0.0.6; fixes bug 4426.
- - Update to the December 6 2011 Maxmind GeoLite Country database.
- o Packaging changes:
- - Make it easier to automate expert package builds on Windows,
- by removing an absolute path from makensis.exe command.
- Changes in version 0.2.1.32 - 2011-12-16
- Tor 0.2.1.32 backports important security and privacy fixes for
- oldstable. This release is intended only for package maintainers and
- others who cannot use the 0.2.2 stable series. All others should be
- using Tor 0.2.2.x or newer.
- The Tor 0.2.1.x series will reach formal end-of-life some time in
- early 2012; we will stop releasing patches for it then.
- o Major bugfixes (also included in 0.2.2.x):
- - Correctly sanity-check that we don't underflow on a memory
- allocation (and then assert) for hidden service introduction
- point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
- bugfix on 0.2.1.5-alpha.
- - Fix a heap overflow bug that could occur when trying to pull
- data into the first chunk of a buffer, when that chunk had
- already had some data drained from it. Fixes CVE-2011-2778;
- bugfix on 0.2.0.16-alpha. Reported by "Vektor".
- o Minor features:
- - Update to the December 6 2011 Maxmind GeoLite Country database.
- Changes in version 0.2.3.9-alpha - 2011-12-08
- Tor 0.2.3.9-alpha introduces initial IPv6 support for bridges, adds
- a "DisableNetwork" security feature that bundles can use to avoid
- touching the network until bridges are configured, moves forward on
- the pluggable transport design, fixes a flaw in the hidden service
- design that unnecessarily prevented clients with wrong clocks from
- reaching hidden services, and fixes a wide variety of other issues.
- o Major features:
- - Clients can now connect to private bridges over IPv6. Bridges
- still need at least one IPv4 address in order to connect to
- other relays. Note that we don't yet handle the case where the
- user has two bridge lines for the same bridge (one IPv4, one
- IPv6). Implements parts of proposal 186.
- - New "DisableNetwork" config option to prevent Tor from launching any
- connections or accepting any connections except on a control port.
- Bundles and controllers can set this option before letting Tor talk
- to the rest of the network, for example to prevent any connections
- to a non-bridge address. Packages like Orbot can also use this
- option to instruct Tor to save power when the network is off.
- - Clients and bridges can now be configured to use a separate
- "transport" proxy. This approach makes the censorship arms race
- easier by allowing bridges to use protocol obfuscation plugins. It
- implements the "managed proxy" part of proposal 180 (ticket 3472).
- - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
- implementation. It makes AES_CTR about 7% faster than our old one
- (which was about 10% faster than the one OpenSSL used to provide).
- Resolves ticket 4526.
- - Add a "tor2web mode" for clients that want to connect to hidden
- services non-anonymously (and possibly more quickly). As a safety
- measure to try to keep users from turning this on without knowing
- what they are doing, tor2web mode must be explicitly enabled at
- compile time, and a copy of Tor compiled to run in tor2web mode
- cannot be used as a normal Tor client. Implements feature 2553.
- - Add experimental support for running on Windows with IOCP and no
- kernel-space socket buffers. This feature is controlled by a new
- "UserspaceIOCPBuffers" config option (off by default), which has
- no effect unless Tor has been built with support for bufferevents,
- is running on Windows, and has enabled IOCP. This may, in the long
- run, help solve or mitigate bug 98.
- - Use a more secure consensus parameter voting algorithm. Now at
- least three directory authorities or a majority of them must
- vote on a given parameter before it will be included in the
- consensus. Implements proposal 178.
- o Major bugfixes:
- - Hidden services now ignore the timestamps on INTRODUCE2 cells.
- They used to check that the timestamp was within 30 minutes
- of their system clock, so they could cap the size of their
- replay-detection cache, but that approach unnecessarily refused
- service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
- the v3 intro-point protocol (the first one which sent a timestamp
- field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
- - Only use the EVP interface when AES acceleration is enabled,
- to avoid a 5-7% performance regression. Resolves issue 4525;
- bugfix on 0.2.3.8-alpha.
- o Privacy/anonymity features (bridge detection):
- - Make bridge SSL certificates a bit more stealthy by using random
- serial numbers, in the same fashion as OpenSSL when generating
- self-signed certificates. Implements ticket 4584.
- - Introduce a new config option "DynamicDHGroups", enabled by
- default, which provides each bridge with a unique prime DH modulus
- to be used during SSL handshakes. This option attempts to help
- against censors who might use the Apache DH modulus as a static
- identifier for bridges. Addresses ticket 4548.
- o Minor features (new/different config options):
- - New configuration option "DisableDebuggerAttachment" (on by default)
- to prevent basic debugging attachment attempts by other processes.
- Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
- - Allow MapAddress directives to specify matches against super-domains,
- as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
- Implements issue 933.
- - Slightly change behavior of "list" options (that is, config
- options that can appear more than once) when they appear both in
- torrc and on the command line. Previously, the command-line options
- would be appended to the ones from torrc. Now, the command-line
- options override the torrc options entirely. This new behavior
- allows the user to override list options (like exit policies and
- ports to listen on) from the command line, rather than simply
- appending to the list.
- - You can get the old (appending) command-line behavior for "list"
- options by prefixing the option name with a "+".
- - You can remove all the values for a "list" option from the command
- line without adding any new ones by prefixing the option name
- with a "/".
- - Add experimental support for a "defaults" torrc file to be parsed
- before the regular torrc. Torrc options override the defaults file's
- options in the same way that the command line overrides the torrc.
- The SAVECONF controller command saves only those options which
- differ between the current configuration and the defaults file. HUP
- reloads both files. (Note: This is an experimental feature; its
- behavior will probably be refined in future 0.2.3.x-alpha versions
- to better meet packagers' needs.) Implements task 4552.
- o Minor features:
- - Try to make the introductory warning message that Tor prints on
- startup more useful for actually finding help and information.
- Resolves ticket 2474.
- - Running "make version" now displays the version of Tor that
- we're about to build. Idea from katmagic; resolves issue 4400.
- - Expire old or over-used hidden service introduction points.
- Required by fix for bug 3460.
- - Move the replay-detection cache for the RSA-encrypted parts of
- INTRODUCE2 cells to the introduction point data structures.
- Previously, we would use one replay-detection cache per hidden
- service. Required by fix for bug 3460.
- - Reduce the lifetime of elements of hidden services' Diffie-Hellman
- public key replay-detection cache from 60 minutes to 5 minutes. This
- replay-detection cache is now used only to detect multiple
- INTRODUCE2 cells specifying the same rendezvous point, so we can
- avoid launching multiple simultaneous attempts to connect to it.
- o Minor bugfixes (on Tor 0.2.2.x and earlier):
- - Resolve an integer overflow bug in smartlist_ensure_capacity().
- Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
- Mansour Moufid.
- - Fix a minor formatting issue in one of tor-gencert's error messages.
- Fixes bug 4574.
- - Prevent a false positive from the check-spaces script, by disabling
- the "whitespace between function name and (" check for functions
- named 'op()'.
- - Fix a log message suggesting that people contact a non-existent
- email address. Fixes bug 3448.
- - Fix null-pointer access that could occur if TLS allocation failed.
- Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
- - Report a real bootstrap problem to the controller on router
- identity mismatch. Previously we just said "foo", which probably
- made a lot of sense at the time. Fixes bug 4169; bugfix on
- 0.2.1.1-alpha.
- - If we had ever tried to call tor_addr_to_str() on an address of
- unknown type, we would have done a strdup() on an uninitialized
- buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
- Reported by "troll_un".
- - Correctly detect and handle transient lookup failures from
- tor_addr_lookup(). Fixes bug 4530; bugfix on 0.2.1.5-alpha.
- Reported by "troll_un".
- - Use tor_socket_t type for listener argument to accept(). Fixes bug
- 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
- - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
- bug 4532; found by "troll_un".
- o Minor bugfixes (on Tor 0.2.3.x):
- - Fix a compile warning in tor_inet_pton(). Bugfix on 0.2.3.8-alpha;
- fixes bug 4554.
- - Don't send two ESTABLISH_RENDEZVOUS cells when opening a new
- circuit for use as a hidden service client's rendezvous point.
- Fixes bugs 4641 and 4171; bugfix on 0.2.3.3-alpha. Diagnosed
- with help from wanoskarnet.
- - Restore behavior of overriding SocksPort, ORPort, and similar
- options from the command line. Bugfix on 0.2.3.3-alpha.
- o Build fixes:
- - Properly handle the case where the build-tree is not the same
- as the source tree when generating src/common/common_sha1.i,
- src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
- bugfix on 0.2.0.1-alpha.
- o Code simplifications, cleanups, and refactorings:
- - Remove the pure attribute from all functions that used it
- previously. In many cases we assigned it incorrectly, because the
- functions might assert or call impure functions, and we don't have
- evidence that keeping the pure attribute is worthwhile. Implements
- changes suggested in ticket 4421.
- - Remove some dead code spotted by coverity. Fixes cid 432.
- Bugfix on 0.2.3.1-alpha, closes bug 4637.
- Changes in version 0.2.3.8-alpha - 2011-11-22
- Tor 0.2.3.8-alpha fixes some crash and assert bugs, including a
- socketpair-related bug that has been bothering Windows users. It adds
- support to serve microdescriptors to controllers, so Vidalia's network
- map can resume listing relays (once Vidalia implements its side),
- and adds better support for hardware AES acceleration. Finally, it
- starts the process of adjusting the bandwidth cutoff for getting the
- "Fast" flag from 20KB to (currently) 32KB -- preliminary results show
- that tiny relays harm performance more than they help network capacity.
- o Major bugfixes:
- - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
- that it doesn't attempt to allocate a socketpair. This could cause
- some problems on Windows systems with overzealous firewalls. Fix for
- bug 4457; workaround for Libevent versions 2.0.1-alpha through
- 2.0.15-stable.
- - Correctly sanity-check that we don't underflow on a memory
- allocation (and then assert) for hidden service introduction
- point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
- bugfix on 0.2.1.5-alpha.
- - Remove the artificially low cutoff of 20KB to guarantee the Fast
- flag. In the past few years the average relay speed has picked
- up, and while the "top 7/8 of the network get the Fast flag" and
- "all relays with 20KB or more of capacity get the Fast flag" rules
- used to have the same result, now the top 7/8 of the network has
- a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
- - Fix a rare assertion failure when checking whether a v0 hidden
- service descriptor has any usable introduction points left, and
- we don't have enough information to build a circuit to the first
- intro point named in the descriptor. The HS client code in
- 0.2.3.x no longer uses v0 HS descriptors, but this assertion can
- trigger on (and crash) v0 HS authorities. Fixes bug 4411.
- Bugfix on 0.2.3.1-alpha; diagnosed by frosty_un.
- - Make bridge authorities not crash when they are asked for their own
- descriptor. Bugfix on 0.2.3.7-alpha, reported by Lucky Green.
- - When running as a client, do not print a misleading (and plain
- wrong) log message that we're collecting "directory request"
- statistics: clients don't collect statistics. Also don't create a
- useless (because empty) stats file in the stats/ directory. Fixes
- bug 4353; bugfix on 0.2.2.34 and 0.2.3.7-alpha.
- o Major features:
- - Allow Tor controllers like Vidalia to obtain the microdescriptor
- for a relay by identity digest or nickname. Previously,
- microdescriptors were only available by their own digests, so a
- controller would have to ask for and parse the whole microdescriptor
- consensus in order to look up a single relay's microdesc. Fixes
- bug 3832; bugfix on 0.2.3.1-alpha.
- - Use OpenSSL's EVP interface for AES encryption, so that all AES
- operations can use hardware acceleration (if present). Resolves
- ticket 4442.
- o Minor bugfixes (on 0.2.2.x and earlier):
- - Detect failure to initialize Libevent. This fix provides better
- detection for future instances of bug 4457.
- - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
- function. This was eating up hideously large amounts of time on some
- busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
- - Don't warn about unused log_mutex in log.c when building with
- --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
- 0.1.0.6-rc which introduced --disable-threads.
- - Allow manual 'authenticate' commands to the controller interface
- from netcat (nc) as well as telnet. We were rejecting them because
- they didn't come with the expected whitespace at the end of the
- command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
- - Fix some (not actually triggerable) buffer size checks in usage of
- tor_inet_ntop. Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
- by Anders Sundman.
- - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
- bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
- - When configuring, starting, or stopping an NT service, stop
- immediately after the service configuration attempt has succeeded
- or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
- - When sending a NETINFO cell, include the original address
- received for the other side, not its canonical address. Found
- by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
- - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
- can pick them up when the tests aren't disabled. Bugfix on
- 0.2.2.4-alpha which introduced tinytest.
- - Fix a memory leak when we check whether a hidden service
- descriptor has any usable introduction points left. Fixes bug
- 4424. Bugfix on 0.2.2.25-alpha.
- - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
- occurred when a client tried to fetch a descriptor for a bridge
- in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
- o Minor bugfixes (on 0.2.3.x):
- - Make util unit tests build correctly with MSVC. Bugfix on
- 0.2.3.3-alpha. Patch by Gisle Vanem.
- - Successfully detect AUTH_CHALLENGE cells with no recognized
- authentication type listed. Fixes bug 4367; bugfix on 0.2.3.6-alpha.
- Found by frosty_un.
- - If a relay receives an AUTH_CHALLENGE cell it can't answer,
- it should still send a NETINFO cell to allow the connection to
- become open. Fixes bug 4368; fix on 0.2.3.6-alpha; bug found by
- "frosty".
- - Log less loudly when we get an invalid authentication certificate
- from a source other than a directory authority: it's not unusual
- to see invalid certs because of clock skew. Fixes bug 4370; bugfix
- on 0.2.3.6-alpha.
- - Tolerate servers with more clock skew in their authentication
- certificates than previously. Fixes bug 4371; bugfix on
- 0.2.3.6-alpha.
- - Fix a couple of compile warnings on Windows. Fixes bug 4469; bugfix
- on 0.2.3.4-alpha and 0.2.3.6-alpha.
- o Minor features:
- - Add two new config options for directory authorities:
- AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
- Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
- that is always sufficient to satisfy the bandwidth requirement for
- the Guard flag. Now it will be easier for researchers to simulate
- Tor networks with different values. Resolves ticket 4484.
- - When Tor ignores a hidden service specified in its configuration,
- include the hidden service's directory in the warning message.
- Previously, we would only tell the user that some hidden service
- was ignored. Bugfix on 0.0.6; fixes bug 4426.
- - When we fail to initialize Libevent, retry with IOCP disabled so we
- don't need to turn on multi-threading support in Libevent, which in
- turn requires a working socketpair(). This is a workaround for bug
- 4457, which affects Libevent versions from 2.0.1-alpha through
- 2.0.15-stable.
- - Detect when we try to build on a platform that doesn't define
- AF_UNSPEC to 0. We don't work there, so refuse to compile.
- - Update to the November 1 2011 Maxmind GeoLite Country database.
- o Packaging changes:
- - Make it easier to automate expert package builds on Windows,
- by removing an absolute path from makensis.exe command.
- o Code simplifications and refactoring:
- - Remove some redundant #include directives throughout the code.
- Patch from Andrea Gelmini.
- - Unconditionally use OpenSSL's AES implementation instead of our
- old built-in one. OpenSSL's AES has been better for a while, and
- relatively few servers should still be on any version of OpenSSL
- that doesn't have good optimized assembly AES.
- - Use the name "CERTS" consistently to refer to the new cell type;
- we were calling it CERT in some places and CERTS in others.
- o Testing:
- - Numerous new unit tests for functions in util.c and address.c by
- Anders Sundman.
- - The long-disabled benchmark tests are now split into their own
- ./src/test/bench binary.
- - The benchmark tests can now use more accurate timers than
- gettimeofday() when such timers are available.
- Changes in version 0.2.3.7-alpha - 2011-10-30
- Tor 0.2.3.7-alpha fixes a crash bug in 0.2.3.6-alpha introduced by
- the new v3 handshake. It also resolves yet another bridge address
- enumeration issue.
- o Major bugfixes:
- - If we mark an OR connection for close based on a cell we process,
- don't process any further cells on it. We already avoid further
- reads on marked-for-close connections, but now we also discard the
- cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
- which was the first version where we might mark a connection for
- close based on processing a cell on it.
- - Fix a double-free bug that would occur when we received an invalid
- certificate in a CERT cell in the new v3 handshake. Fixes bug 4343;
- bugfix on 0.2.3.6-alpha.
- - Bridges no longer include their address in NETINFO cells on outgoing
- OR connections, to allow them to blend in better with clients.
- Removes another avenue for enumerating bridges. Reported by
- "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
- cells were introduced.
- o Trivial fixes:
- - Fixed a typo in a hibernation-related log message. Fixes bug 4331;
- bugfix on 0.2.2.23-alpha; found by "tmpname0901".
- Changes in version 0.2.3.6-alpha - 2011-10-26
- Tor 0.2.3.6-alpha includes the fix from 0.2.2.34 for a critical
- anonymity vulnerability where an attacker can deanonymize Tor
- users. Everybody should upgrade.
- This release also features support for a new v3 connection handshake
- protocol, and fixes to make hidden service connections more robust.
- o Major features:
- - Implement a new handshake protocol (v3) for authenticating Tors to
- each other over TLS. It should be more resistant to fingerprinting
- than previous protocols, and should require less TLS hacking for
- future Tor implementations. Implements proposal 176.
- - Allow variable-length padding cells to disguise the length of
- Tor's TLS records. Implements part of proposal 184.
- o Privacy/anonymity fixes (clients):
- - Clients and bridges no longer send TLS certificate chains on
- outgoing OR connections. Previously, each client or bridge would
- use the same cert chain for all outgoing OR connections until
- its IP address changes, which allowed any relay that the client
- or bridge contacted to determine which entry guards it is using.
- Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
- - If a relay receives a CREATE_FAST cell on a TLS connection, it
- no longer considers that connection as suitable for satisfying a
- circuit EXTEND request. Now relays can protect clients from the
- CVE-2011-2768 issue even if the clients haven't upgraded yet.
- - Directory authorities no longer assign the Guard flag to relays
- that haven't upgraded to the above "refuse EXTEND requests
- to client connections" fix. Now directory authorities can
- protect clients from the CVE-2011-2768 issue even if neither
- the clients nor the relays have upgraded yet. There's a new
- "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
- to let us transition smoothly, else tomorrow there would be no
- guard relays.
- o Major bugfixes (hidden services):
- - Improve hidden service robustness: when an attempt to connect to
- a hidden service ends, be willing to refetch its hidden service
- descriptors from each of the HSDir relays responsible for them
- immediately. Previously, we would not consider refetching the
- service's descriptors from each HSDir for 15 minutes after the last
- fetch, which was inconvenient if the hidden service was not running
- during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
- - When one of a hidden service's introduction points appears to be
- unreachable, stop trying it. Previously, we would keep trying
- to build circuits to the introduction point until we lost the
- descriptor, usually because the user gave up and restarted Tor.
- Partly fixes bug 3825.
- - Don't launch a useless circuit after failing to use one of a
- hidden service's introduction points. Previously, we would
- launch a new introduction circuit, but not set the hidden service
- which that circuit was intended to connect to, so it would never
- actually be used. A different piece of code would then create a
- new introduction circuit correctly. Bug reported by katmagic and
- found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
- o Major bugfixes (other):
- - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
- that they initiated. Relays could distinguish incoming bridge
- connections from client connections, creating another avenue for
- enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
- Found by "frosty_un".
- - Don't update the AccountingSoftLimitHitAt state file entry whenever
- tor gets started. This prevents a wrong average bandwidth
- estimate, which would cause relays to always start a new accounting
- interval at the earliest possible moment. Fixes bug 2003; bugfix
- on 0.2.2.7-alpha. Reported by BryonEldridge, who also helped
- immensely in tracking this bug down.
- - Fix a crash bug when changing node restrictions while a DNS lookup
- is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
- by "Tey'".
- o Minor bugfixes (on 0.2.2.x and earlier):
- - When a hidden service turns an extra service-side introduction
- circuit into a general-purpose circuit, free the rend_data and
- intro_key fields first, so we won't leak memory if the circuit
- is cannibalized for use as another service-side introduction
- circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
- - Rephrase the log message emitted if the TestSocks check is
- successful. Patch from Fabian Keil; fixes bug 4094.
- - Bridges now skip DNS self-tests, to act a little more stealthily.
- Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
- bridges. Patch by "warms0x".
- - Remove a confusing dollar sign from the example fingerprint in the
- man page, and also make the example fingerprint a valid one. Fixes
- bug 4309; bugfix on 0.2.1.3-alpha.
- - Fix internal bug-checking logic that was supposed to catch
- failures in digest generation so that it will fail more robustly
- if we ask for a nonexistent algorithm. Found by Coverity Scan.
- Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
- - Report any failure in init_keys() calls launched because our
- IP address has changed. Spotted by Coverity Scan. Bugfix on
- 0.1.1.4-alpha; fixes CID 484.
- o Minor bugfixes (on 0.2.3.x):
- - Fix a bug in configure.in that kept it from building a configure
- script with autoconf versions earlier than 2.61. Fixes bug 2430;
- bugfix on 0.2.3.1-alpha.
- - Don't warn users that they are exposing a client port to the
- Internet if they have specified an RFC1918 address. Previously,
- we would warn if the user had specified any non-loopback
- address. Bugfix on 0.2.3.3-alpha. Fixes bug 4018; reported by Tas.
- - Fix memory leaks in the failing cases of the new SocksPort and
- ControlPort code. Found by Coverity Scan. Bugfix on 0.2.3.3-alpha;
- fixes coverity CIDs 485, 486, and 487.
- o Minor features:
- - When a hidden service's introduction point times out, consider
- trying it again during the next attempt to connect to the
- HS. Previously, we would not try it again unless a newly fetched
- descriptor contained it. Required by fixes for bugs 1297 and 3825.
- - The next version of Windows will be called Windows 8, and it has
- a major version of 6, minor version of 2. Correctly identify that
- version instead of calling it "Very recent version". Resolves
- ticket 4153; reported by funkstar.
- - The Bridge Authority now writes statistics on how many bridge
- descriptors it gave out in total, and how many unique descriptors
- it gave out. It also lists how often the most and least commonly
- fetched descriptors were given out, as well as the median and
- 25th/75th percentile. Implements tickets 4200 and 4294.
- - Update to the October 4 2011 Maxmind GeoLite Country database.
- o Code simplifications and refactoring:
- - Remove some old code to remember statistics about which descriptors
- we've served as a directory mirror. The feature wasn't used and
- is outdated now that microdescriptors are around.
- - Rename Tor functions that turn strings into addresses, so that
- "parse" indicates that no hostname resolution occurs, and
- "lookup" indicates that hostname resolution may occur. This
- should help prevent mistakes in the future. Fixes bug 3512.
- Changes in version 0.2.2.34 - 2011-10-26
- Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
- can deanonymize Tor users. Everybody should upgrade.
- The attack relies on four components: 1) Clients reuse their TLS cert
- when talking to different relays, so relays can recognize a user by
- the identity key in her cert. 2) An attacker who knows the client's
- identity key can probe each guard relay to see if that identity key
- is connected to that guard relay right now. 3) A variety of active
- attacks in the literature (starting from "Low-Cost Traffic Analysis
- of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
- discover the guard relays that a Tor user visiting the website is using.
- 4) Clients typically pick three guards at random, so the set of guards
- for a given user could well be a unique fingerprint for her. This
- release fixes components #1 and #2, which is enough to block the attack;
- the other two remain as open research problems. Special thanks to
- "frosty_un" for reporting the issue to us!
- Clients should upgrade so they are no longer recognizable by the TLS
- certs they present. Relays should upgrade so they no longer allow a
- remote attacker to probe them to test whether unpatched clients are
- currently connected to them.
- This release also fixes several vulnerabilities that allow an attacker
- to enumerate bridge relays. Some bridge enumeration attacks still
- remain; see for example proposal 188.
- o Privacy/anonymity fixes (clients):
- - Clients and bridges no longer send TLS certificate chains on
- outgoing OR connections. Previously, each client or bridge would
- use the same cert chain for all outgoing OR connections until
- its IP address changes, which allowed any relay that the client
- or bridge contacted to determine which entry guards it is using.
- Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
- - If a relay receives a CREATE_FAST cell on a TLS connection, it
- no longer considers that connection as suitable for satisfying a
- circuit EXTEND request. Now relays can protect clients from the
- CVE-2011-2768 issue even if the clients haven't upgraded yet.
- - Directory authorities no longer assign the Guard flag to relays
- that haven't upgraded to the above "refuse EXTEND requests
- to client connections" fix. Now directory authorities can
- protect clients from the CVE-2011-2768 issue even if neither
- the clients nor the relays have upgraded yet. There's a new
- "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
- to let us transition smoothly, else tomorrow there would be no
- guard relays.
- o Privacy/anonymity fixes (bridge enumeration):
- - Bridge relays now do their directory fetches inside Tor TLS
- connections, like all the other clients do, rather than connecting
- directly to the DirPort like public relays do. Removes another
- avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
- - Bridges relays now build circuits for themselves in a more similar
- way to how clients build them. Removes another avenue for
- enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
- when bridges were introduced.
- - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
- that they initiated. Relays could distinguish incoming bridge
- connections from client connections, creating another avenue for
- enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
- Found by "frosty_un".
- o Major bugfixes:
- - Fix a crash bug when changing node restrictions while a DNS lookup
- is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
- by "Tey'".
- - Don't launch a useless circuit after failing to use one of a
- hidden service's introduction points. Previously, we would
- launch a new introduction circuit, but not set the hidden service
- which that circuit was intended to connect to, so it would never
- actually be used. A different piece of code would then create a
- new introduction circuit correctly. Bug reported by katmagic and
- found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
- o Minor bugfixes:
- - Change an integer overflow check in the OpenBSD_Malloc code so
- that GCC is less likely to eliminate it as impossible. Patch
- from Mansour Moufid. Fixes bug 4059.
- - When a hidden service turns an extra service-side introduction
- circuit into a general-purpose circuit, free the rend_data and
- intro_key fields first, so we won't leak memory if the circuit
- is cannibalized for use as another service-side introduction
- circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
- - Bridges now skip DNS self-tests, to act a little more stealthily.
- Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
- bridges. Patch by "warms0x".
- - Fix internal bug-checking logic that was supposed to catch
- failures in digest generation so that it will fail more robustly
- if we ask for a nonexistent algorithm. Found by Coverity Scan.
- Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
- - Report any failure in init_keys() calls launched because our
- IP address has changed. Spotted by Coverity Scan. Bugfix on
- 0.1.1.4-alpha; fixes CID 484.
- o Minor bugfixes (log messages and documentation):
- - Remove a confusing dollar sign from the example fingerprint in the
- man page, and also make the example fingerprint a valid one. Fixes
- bug 4309; bugfix on 0.2.1.3-alpha.
- - The next version of Windows will be called Windows 8, and it has
- a major version of 6, minor version of 2. Correctly identify that
- version instead of calling it "Very recent version". Resolves
- ticket 4153; reported by funkstar.
- - Downgrade log messages about circuit timeout calibration from
- "notice" to "info": they don't require or suggest any human
- intervention. Patch from Tom Lowenthal. Fixes bug 4063;
- bugfix on 0.2.2.14-alpha.
- o Minor features:
- - Turn on directory request statistics by default and include them in
- extra-info descriptors. Don't break if we have no GeoIP database.
- Backported from 0.2.3.1-alpha; implements ticket 3951.
- - Update to the October 4 2011 Maxmind GeoLite Country database.
- Changes in version 0.2.1.31 - 2011-10-26
- Tor 0.2.1.31 backports important security and privacy fixes for
- oldstable. This release is intended only for package maintainers and
- others who cannot use the 0.2.2 stable series. All others should be
- using Tor 0.2.2.x or newer.
- o Security fixes (also included in 0.2.2.x):
- - Replace all potentially sensitive memory comparison operations
- with versions whose runtime does not depend on the data being
- compared. This will help resist a class of attacks where an
- adversary can use variations in timing information to learn
- sensitive data. Fix for one case of bug 3122. (Safe memcmp
- implementation by Robert Ransom based partially on code by DJB.)
- - Fix an assert in parsing router descriptors containing IPv6
- addresses. This one took down the directory authorities when
- somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
- o Privacy/anonymity fixes (also included in 0.2.2.x):
- - Clients and bridges no longer send TLS certificate chains on
- outgoing OR connections. Previously, each client or bridge would
- use the same cert chain for all outgoing OR connections until
- its IP address changes, which allowed any relay that the client
- or bridge contacted to determine which entry guards it is using.
- Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
- - If a relay receives a CREATE_FAST cell on a TLS connection, it
- no longer considers that connection as suitable for satisfying a
- circuit EXTEND request. Now relays can protect clients from the
- CVE-2011-2768 issue even if the clients haven't upgraded yet.
- - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
- that they initiated. Relays could distinguish incoming bridge
- connections from client connections, creating another avenue for
- enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
- Found by "frosty_un".
- - When receiving a hidden service descriptor, check that it is for
- the hidden service we wanted. Previously, Tor would store any
- hidden service descriptors that a directory gave it, whether it
- wanted them or not. This wouldn't have let an attacker impersonate
- a hidden service, but it did let directories pre-seed a client
- with descriptors that it didn't want. Bugfix on 0.0.6.
- - Avoid linkability based on cached hidden service descriptors: forget
- all hidden service descriptors cached as a client when processing a
- SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
- - Make the bridge directory authority refuse to answer directory
- requests for "all" descriptors. It used to include bridge
- descriptors in its answer, which was a major information leak.
- Found by "piebeer". Bugfix on 0.2.0.3-alpha.
- - Don't attach new streams to old rendezvous circuits after SIGNAL
- NEWNYM. Previously, we would keep using an existing rendezvous
- circuit if it remained open (i.e. if it were kept open by a
- long-lived stream, or if a new stream were attached to it before
- Tor could notice that it was old and no longer in use). Bugfix on
- 0.1.1.15-rc; fixes bug 3375.
- o Minor bugfixes (also included in 0.2.2.x):
- - When we restart our relay, we might get a successful connection
- from the outside before we've started our reachability tests,
- triggering a warning: "ORPort found reachable, but I have no
- routerinfo yet. Failing to inform controller of success." This
- bug was harmless unless Tor is running under a controller
- like Vidalia, in which case the controller would never get a
- REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
- fixes bug 1172.
- - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
- enabled. Fixes bug 1526.
- - Remove undocumented option "-F" from tor-resolve: it hasn't done
- anything since 0.2.1.16-rc.
- - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
- None of the cases where we did this before were wrong, but by making
- this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
- - Fix a rare crash bug that could occur when a client was configured
- with a large number of bridges. Fixes bug 2629; bugfix on
- 0.2.1.2-alpha. Bugfix by trac user "shitlei".
- - Correct the warning displayed when a rendezvous descriptor exceeds
- the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
- John Brooks.
- - Fix an uncommon assertion failure when running with DNSPort under
- heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
- - When warning about missing zlib development packages during compile,
- give the correct package names. Bugfix on 0.2.0.1-alpha.
- - Require that introduction point keys and onion keys have public
- exponent 65537. Bugfix on 0.2.0.10-alpha.
- - Do not crash when our configuration file becomes unreadable, for
- example due to a permissions change, between when we start up
- and when a controller calls SAVECONF. Fixes bug 3135; bugfix
- on 0.0.9pre6.
- - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
- Fixes bug 3208.
- - Always NUL-terminate the sun_path field of a sockaddr_un before
- passing it to the kernel. (Not a security issue: kernels are
- smart enough to reject bad sockaddr_uns.) Found by Coverity;
- CID #428. Bugfix on Tor 0.2.0.3-alpha.
- - Don't stack-allocate the list of supplementary GIDs when we're
- about to log them. Stack-allocating NGROUPS_MAX gid_t elements
- could take up to 256K, which is way too much stack. Found by
- Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
- o Minor bugfixes (only in 0.2.1.x):
- - Resume using micro-version numbers in 0.2.1.x: our Debian packages
- rely on them. Bugfix on 0.2.1.30.
- - Use git revisions instead of svn revisions when generating our
- micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
- o Minor features (also included in 0.2.2.x):
- - Adjust the expiration time on our SSL session certificates to
- better match SSL certs seen in the wild. Resolves ticket 4014.
- - Allow nameservers with IPv6 address. Resolves bug 2574.
- - Update to the October 4 2011 Maxmind GeoLite Country database.
- Changes in version 0.2.3.5-alpha - 2011-09-28
- Tor 0.2.3.5-alpha fixes two bugs that make it possible to enumerate
- bridge relays; fixes an assertion error that many users started hitting
- today; and adds the ability to refill token buckets more often than
- once per second, allowing significant performance improvements.
- o Security fixes:
- - Bridge relays now do their directory fetches inside Tor TLS
- connections, like all the other clients do, rather than connecting
- directly to the DirPort like public relays do. Removes another
- avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
- - Bridges relays now build circuits for themselves in a more similar
- way to how clients build them. Removes another avenue for
- enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
- when bridges were introduced.
- o Major bugfixes:
- - Fix an "Assertion md->held_by_node == 1 failed" error that could
- occur when the same microdescriptor was referenced by two node_t
- objects at once. Fix for bug 4118; bugfix on Tor 0.2.3.1-alpha.
- o Major features (networking):
- - Add a new TokenBucketRefillInterval option to refill token buckets
- more frequently than once per second. This should improve network
- performance, alleviate queueing problems, and make traffic less
- bursty. Implements proposal 183; closes ticket 3630. Design by
- Florian Tschorsch and Björn Scheuermann; implementation by
- Florian Tschorsch.
- o Minor bugfixes:
- - Change an integer overflow check in the OpenBSD_Malloc code so
- that GCC is less likely to eliminate it as impossible. Patch
- from Mansour Moufid. Fixes bug 4059.
- o Minor bugfixes (usability):
- - Downgrade log messages about circuit timeout calibration from
- "notice" to "info": they don't require or suggest any human
- intervention. Patch from Tom Lowenthal. Fixes bug 4063;
- bugfix on 0.2.2.14-alpha.
- o Minor features (diagnostics):
- - When the system call to create a listener socket fails, log the
- error message explaining why. This may help diagnose bug 4027.
- Changes in version 0.2.3.4-alpha - 2011-09-13
- Tor 0.2.3.4-alpha includes the fixes from 0.2.2.33, including a slight
- tweak to Tor's TLS handshake that makes relays and bridges that run
- this new version reachable from Iran again. It also fixes a few new
- bugs in 0.2.3.x, and teaches relays to recognize when they're not
- listed in the network consensus and republish.
- o Major bugfixes (also part of 0.2.2.33):
- - Avoid an assertion failure when reloading a configuration with
- TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
- 3923; bugfix on 0.2.2.25-alpha.
- o Minor features (security, also part of 0.2.2.33):
- - Check for replays of the public-key encrypted portion of an
- INTRODUCE1 cell, in addition to the current check for replays of
- the g^x value. This prevents a possible class of active attacks
- by an attacker who controls both an introduction point and a
- rendezvous point, and who uses the malleability of AES-CTR to
- alter the encrypted g^x portion of the INTRODUCE1 cell. We think
- that these attacks are infeasible (requiring the attacker to send
- on the order of zettabytes of altered cells in a short interval),
- but we'd rather block them off in case there are any classes of
- this attack that we missed. Reported by Willem Pinckaers.
- o Minor features (also part of 0.2.2.33):
- - Adjust the expiration time on our SSL session certificates to
- better match SSL certs seen in the wild. Resolves ticket 4014.
- - Change the default required uptime for a relay to be accepted as
- a HSDir (hidden service directory) from 24 hours to 25 hours.
- Improves on 0.2.0.10-alpha; resolves ticket 2649.
- - Add a VoteOnHidServDirectoriesV2 config option to allow directory
- authorities to abstain from voting on assignment of the HSDir
- consensus flag. Related to bug 2649.
- - Update to the September 6 2011 Maxmind GeoLite Country database.
- o Minor bugfixes (also part of 0.2.2.33):
- - Demote the 'replay detected' log message emitted when a hidden
- service receives the same Diffie-Hellman public key in two different
- INTRODUCE2 cells to info level. A normal Tor client can cause that
- log message during its normal operation. Bugfix on 0.2.1.6-alpha;
- fixes part of bug 2442.
- - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
- level. There is nothing that a hidden service's operator can do
- to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
- of bug 2442.
- - Clarify a log message specifying the characters permitted in
- HiddenServiceAuthorizeClient client names. Previously, the log
- message said that "[A-Za-z0-9+-_]" were permitted; that could have
- given the impression that every ASCII character between "+" and "_"
- was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
- o Build fixes (also part of 0.2.2.33):
- - Clean up some code issues that prevented Tor from building on older
- BSDs. Fixes bug 3894; reported by "grarpamp".
- - Search for a platform-specific version of "ar" when cross-compiling.
- Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
- o Major bugfixes:
- - Fix a bug where the SocksPort option (for example) would get
- ignored and replaced by the default if a SocksListenAddress
- option was set. Bugfix on 0.2.3.3-alpha; fixes bug 3936. Fix by
- Fabian Keil.
- o Major features:
- - Relays now try regenerating and uploading their descriptor more
- frequently if they are not listed in the consensus, or if the
- version of their descriptor listed in the consensus is too
- old. This fix should prevent situations where a server declines
- to re-publish itself because it has done so too recently, even
- though the authorities decided not to list its recent-enough
- descriptor. Fix for bug 3327.
- o Minor features:
- - Relays now include a reason for regenerating their descriptors
- in an HTTP header when uploading to the authorities. This will
- make it easier to debug descriptor-upload issues in the future.
- - When starting as root and then changing our UID via the User
- control option, and we have a ControlSocket configured, make sure
- that the ControlSocket is owned by the same account that Tor will
- run under. Implements ticket 3421; fix by Jérémy Bobbio.
- o Minor bugfixes:
- - Abort if tor_vasprintf fails in connection_printf_to_buf (a
- utility function used in the control-port code). This shouldn't
- ever happen unless Tor is completely out of memory, but if it did
- happen and Tor somehow recovered from it, Tor could have sent a log
- message to a control port in the middle of a reply to a controller
- command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
- - Make 'FetchUselessDescriptors' cause all descriptor types and
- all consensus types (including microdescriptors) to get fetched.
- Fixes bug 3851; bugfix on 0.2.3.1-alpha.
- o Code refactoring:
- - Make a new "entry connection" struct as an internal subtype of "edge
- connection", to simplify the code and make exit connections smaller.
- Changes in version 0.2.2.33 - 2011-09-13
- Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
- TLS handshake that makes relays and bridges that run this new version
- reachable from Iran again.
- o Major bugfixes:
- - Avoid an assertion failure when reloading a configuration with
- TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
- 3923; bugfix on 0.2.2.25-alpha.
- o Minor features (security):
- - Check for replays of the public-key encrypted portion of an
- INTRODUCE1 cell, in addition to the current check for replays of
- the g^x value. This prevents a possible class of active attacks
- by an attacker who controls both an introduction point and a
- rendezvous point, and who uses the malleability of AES-CTR to
- alter the encrypted g^x portion of the INTRODUCE1 cell. We think
- that these attacks are infeasible (requiring the attacker to send
- on the order of zettabytes of altered cells in a short interval),
- but we'd rather block them off in case there are any classes of
- this attack that we missed. Reported by Willem Pinckaers.
- o Minor features:
- - Adjust the expiration time on our SSL session certificates to
- better match SSL certs seen in the wild. Resolves ticket 4014.
- - Change the default required uptime for a relay to be accepted as
- a HSDir (hidden service directory) from 24 hours to 25 hours.
- Improves on 0.2.0.10-alpha; resolves ticket 2649.
- - Add a VoteOnHidServDirectoriesV2 config option to allow directory
- authorities to abstain from voting on assignment of the HSDir
- consensus flag. Related to bug 2649.
- - Update to the September 6 2011 Maxmind GeoLite Country database.
- o Minor bugfixes (documentation and log messages):
- - Correct the man page to explain that HashedControlPassword and
- CookieAuthentication can both be set, in which case either method
- is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
- when we decided to allow these config options to both be set. Issue
- raised by bug 3898.
- - Demote the 'replay detected' log message emitted when a hidden
- service receives the same Diffie-Hellman public key in two different
- INTRODUCE2 cells to info level. A normal Tor client can cause that
- log message during its normal operation. Bugfix on 0.2.1.6-alpha;
- fixes part of bug 2442.
- - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
- level. There is nothing that a hidden service's operator can do
- to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
- of bug 2442.
- - Clarify a log message specifying the characters permitted in
- HiddenServiceAuthorizeClient client names. Previously, the log
- message said that "[A-Za-z0-9+-_]" were permitted; that could have
- given the impression that every ASCII character between "+" and "_"
- was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
- o Build fixes:
- - Provide a substitute implementation of lround() for MSVC, which
- apparently lacks it. Patch from Gisle Vanem.
- - Clean up some code issues that prevented Tor from building on older
- BSDs. Fixes bug 3894; reported by "grarpamp".
- - Search for a platform-specific version of "ar" when cross-compiling.
- Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
- Changes in version 0.2.3.3-alpha - 2011-09-01
- Tor 0.2.3.3-alpha adds a new "stream isolation" feature to improve Tor's
- security, and provides client-side support for the microdescriptor
- and optimistic data features introduced earlier in the 0.2.3.x
- series. It also includes numerous critical bugfixes in the (optional)
- bufferevent-based networking backend.
- o Major features (stream isolation):
- - You can now configure Tor so that streams from different
- applications are isolated on different circuits, to prevent an
- attacker who sees your streams as they leave an exit node from
- linking your sessions to one another. To do this, choose some way
- to distinguish the applications: have them connect to different
- SocksPorts, or have one of them use SOCKS4 while the other uses
- SOCKS5, or have them pass different authentication strings to the
- SOCKS proxy. Then, use the new SocksPort syntax to configure the
- degree of isolation you need. This implements Proposal 171.
- - There's a new syntax for specifying multiple client ports (such as
- SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
- multiple *Port entries with full addr:port syntax on each.
- The old *ListenAddress format is still supported, but you can't
- mix it with the new *Port syntax.
- o Major features (other):
- - Enable microdescriptor fetching by default for clients. This allows
- clients to download a much smaller amount of directory information.
- To disable it (and go back to the old-style consensus and
- descriptors), set "UseMicrodescriptors 0" in your torrc file.
- - Tor's firewall-helper feature, introduced in 0.2.3.1-alpha (see the
- "PortForwarding" config option), now supports Windows.
- - When using an exit relay running 0.2.3.x, clients can now
- "optimistically" send data before the exit relay reports that
- the stream has opened. This saves a round trip when starting
- connections where the client speaks first (such as web browsing).
- This behavior is controlled by a consensus parameter (currently
- disabled). To turn it on or off manually, use the "OptimisticData"
- torrc option. Implements proposal 181; code by Ian Goldberg.
- o Major bugfixes (bufferevents, fixes on 0.2.3.1-alpha):
- - When using IOCP on Windows, we need to enable Libevent windows
- threading support.
- - The IOCP backend now works even when the user has not specified
- the (internal, debugging-only) _UseFilteringSSLBufferevents option.
- Fixes part of bug 3752.
- - Correctly record the bytes we've read and written when using
- bufferevents, so that we can include them in our bandwidth history
- and advertised bandwidth. Fixes bug 3803.
- - Apply rate-limiting only at the bottom of a chain of filtering
- bufferevents. This prevents us from filling up internal read
- buffers and violating rate-limits when filtering bufferevents
- are enabled. Fixes part of bug 3804.
- - Add high-watermarks to the output buffers for filtered
- bufferevents. This prevents us from filling up internal write
- buffers and wasting CPU cycles when filtering bufferevents are
- enabled. Fixes part of bug 3804.
- - Correctly notice when data has been written from a bufferevent
- without flushing it completely. Fixes bug 3805.
- - Fix a bug where server-side tunneled bufferevent-based directory
- streams would get closed prematurely. Fixes bug 3814.
- - Fix a use-after-free error with per-connection rate-limiting
- buckets. Fixes bug 3888.
- o Major bugfixes (also part of 0.2.2.31-rc):
- - If we're configured to write our ControlPorts to disk, only write
- them after switching UID and creating the data directory. This way,
- we don't fail when starting up with a nonexistent DataDirectory
- and a ControlPortWriteToFile setting based on that directory. Fixes
- bug 3747; bugfix on Tor 0.2.2.26-beta.
- o Minor features:
- - Added a new CONF_CHANGED event so that controllers can be notified
- of any configuration changes made by other controllers, or by the
- user. Implements ticket 1692.
- - Use evbuffer_copyout() in inspect_evbuffer(). This fixes a memory
- leak when using bufferevents, and lets Libevent worry about how to
- best copy data out of a buffer.
- - Replace files in stats/ rather than appending to them. Now that we
- include statistics in extra-info descriptors, it makes no sense to
- keep old statistics forever. Implements ticket 2930.
- o Minor features (build compatibility):
- - Limited, experimental support for building with nmake and MSVC.
- - Provide a substitute implementation of lround() for MSVC, which
- apparently lacks it. Patch from Gisle Vanem.
- o Minor features (also part of 0.2.2.31-rc):
- - Update to the August 2 2011 Maxmind GeoLite Country database.
- o Minor bugfixes (on 0.2.3.x-alpha):
- - Fix a spurious warning when parsing SOCKS requests with
- bufferevents enabled. Fixes bug 3615; bugfix on 0.2.3.2-alpha.
- - Get rid of a harmless warning that could happen on relays running
- with bufferevents. The warning was caused by someone doing an http
- request to a relay's orport. Also don't warn for a few related
- non-errors. Fixes bug 3700; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (on 2.2.x and earlier):
- - Correct the man page to explain that HashedControlPassword and
- CookieAuthentication can both be set, in which case either method
- is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
- when we decided to allow these config options to both be set. Issue
- raised by bug 3898.
- - The "--quiet" and "--hush" options now apply not only to Tor's
- behavior before logs are configured, but also to Tor's behavior in
- the absence of configured logs. Fixes bug 3550; bugfix on
- 0.2.0.10-alpha.
- o Minor bugfixes (also part of 0.2.2.31-rc):
- - Write several files in text mode, on OSes that distinguish text
- mode from binary mode (namely, Windows). These files are:
- 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
- that collect those statistics; 'client_keys' and 'hostname' for
- hidden services that use authentication; and (in the tor-gencert
- utility) newly generated identity and signing keys. Previously,
- we wouldn't specify text mode or binary mode, leading to an
- assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
- the DirRecordUsageByCountry option which would have triggered
- the assertion failure was added), although this assertion failure
- would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
- - Selectively disable deprecation warnings on OS X because Lion
- started deprecating the shipped copy of openssl. Fixes bug 3643.
- - Remove an extra pair of quotation marks around the error
- message in control-port STATUS_GENERAL BUG events. Bugfix on
- 0.1.2.6-alpha; fixes bug 3732.
- - When unable to format an address as a string, report its value
- as "???" rather than reusing the last formatted address. Bugfix
- on 0.2.1.5-alpha.
- o Code simplifications and refactoring:
- - Rewrite the listener-selection logic so that parsing which ports
- we want to listen on is now separate from binding to the ports
- we want.
- o Build changes:
- - Building Tor with bufferevent support now requires Libevent
- 2.0.13-stable or later. Previous versions of Libevent had bugs in
- SSL-related bufferevents and related issues that would make Tor
- work badly with bufferevents. Requiring 2.0.13-stable also allows
- Tor with bufferevents to take advantage of Libevent APIs
- introduced after 2.0.8-rc.
- Changes in version 0.2.2.32 - 2011-08-27
- The Tor 0.2.2 release series is dedicated to the memory of Andreas
- Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
- a founder of the PETS community, a leader in our field, a mentor,
- and a friend. He left us with these words: "I had the possibility
- to contribute to this world that is not as it should be. I hope I
- could help in some areas to make the world a better place, and that
- I could also encourage other people to be engaged in improving the
- world. Please, stay engaged. This world needs you, your love, your
- initiative -- now I cannot be part of that anymore."
- Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
- ready. More than two years in the making, this release features improved
- client performance and hidden service reliability, better compatibility
- for Android, correct behavior for bridges that listen on more than
- one address, more extensible and flexible directory object handling,
- better reporting of network statistics, improved code security, and
- many many other features and bugfixes.
- Changes in version 0.2.2.31-rc - 2011-08-17
- Tor 0.2.2.31-rc is the second and hopefully final release candidate
- for the Tor 0.2.2.x series.
- o Major bugfixes:
- - Remove an extra pair of quotation marks around the error
- message in control-port STATUS_GENERAL BUG events. Bugfix on
- 0.1.2.6-alpha; fixes bug 3732.
- - If we're configured to write our ControlPorts to disk, only write
- them after switching UID and creating the data directory. This way,
- we don't fail when starting up with a nonexistent DataDirectory
- and a ControlPortWriteToFile setting based on that directory. Fixes
- bug 3747; bugfix on Tor 0.2.2.26-beta.
- o Minor features:
- - Update to the August 2 2011 Maxmind GeoLite Country database.
- o Minor bugfixes:
- - Allow GETINFO fingerprint to return a fingerprint even when
- we have not yet built a router descriptor. Fixes bug 3577;
- bugfix on 0.2.0.1-alpha.
- - Write several files in text mode, on OSes that distinguish text
- mode from binary mode (namely, Windows). These files are:
- 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
- that collect those statistics; 'client_keys' and 'hostname' for
- hidden services that use authentication; and (in the tor-gencert
- utility) newly generated identity and signing keys. Previously,
- we wouldn't specify text mode or binary mode, leading to an
- assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
- the DirRecordUsageByCountry option which would have triggered
- the assertion failure was added), although this assertion failure
- would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
- - Selectively disable deprecation warnings on OS X because Lion
- started deprecating the shipped copy of openssl. Fixes bug 3643.
- - When unable to format an address as a string, report its value
- as "???" rather than reusing the last formatted address. Bugfix
- on 0.2.1.5-alpha.
- Changes in version 0.2.3.2-alpha - 2011-07-18
- Tor 0.2.3.2-alpha introduces two new experimental features:
- microdescriptors and pluggable transports. It also continues cleaning
- up a variety of recently introduced features.
- o Major features:
- - Clients can now use microdescriptors instead of regular descriptors
- to build circuits. Microdescriptors are authority-generated
- summaries of regular descriptors' contents, designed to change
- very rarely (see proposal 158 for details). This feature is
- designed to save bandwidth, especially for clients on slow internet
- connections. It's off by default for now, since nearly no caches
- support it, but it will be on-by-default for clients in a future
- version. You can use the UseMicrodescriptors option to turn it on.
- - Tor clients using bridges can now be configured to use a separate
- 'transport' proxy for each bridge. This approach helps to resist
- censorship by allowing bridges to use protocol obfuscation
- plugins. It implements part of proposal 180. Implements ticket 2841.
- - While we're trying to bootstrap, record how many TLS connections
- fail in each state, and report which states saw the most failures
- in response to any bootstrap failures. This feature may speed up
- diagnosis of censorship events. Implements ticket 3116.
- o Major bugfixes (on 0.2.3.1-alpha):
- - When configuring a large set of nodes in EntryNodes (as with
- 'EntryNodes {cc}' or 'EntryNodes 1.1.1.1/16'), choose only a
- random subset to be guards, and choose them in random
- order. Fixes bug 2798.
- - Tor could crash when remembering a consensus in a non-used consensus
- flavor without having a current consensus set. Fixes bug 3361.
- - Comparing an unknown address to a microdescriptor's shortened exit
- policy would always give a "rejected" result. Fixes bug 3599.
- - Using microdescriptors as a client no longer prevents Tor from
- uploading and downloading hidden service descriptors. Fixes
- bug 3601.
- o Minor features:
- - Allow nameservers with IPv6 address. Resolves bug 2574.
- - Accept attempts to include a password authenticator in the
- handshake, as supported by SOCKS5. This handles SOCKS clients that
- don't know how to omit a password when authenticating. Resolves
- bug 1666.
- - When configuring a large set of nodes in EntryNodes, and there are
- enough of them listed as Guard so that we don't need to consider
- the non-guard entries, prefer the ones listed with the Guard flag.
- - Check for and recover from inconsistency in the microdescriptor
- cache. This will make it harder for us to accidentally free a
- microdescriptor without removing it from the appropriate data
- structures. Fixes issue 3135; issue noted by "wanoskarnet".
- - Log SSL state transitions at log level DEBUG, log domain
- HANDSHAKE. This can be useful for debugging censorship events.
- Implements ticket 3264.
- - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
- implements ticket 3439.
- o Minor bugfixes (on 0.2.3.1-alpha):
- - Do not free all general-purpose regular descriptors just
- because microdescriptor use is enabled. Fixes bug 3113.
- - Correctly link libevent_openssl when --enable-static-libevent
- is passed to configure. Fixes bug 3118.
- - Bridges should not complain during their heartbeat log messages that
- they are unlisted in the consensus: that's more or less the point
- of being a bridge. Fixes bug 3183.
- - Report a SIGNAL event to controllers when acting on a delayed
- SIGNAL NEWNYM command. Previously, we would report a SIGNAL
- event to the controller if we acted on a SIGNAL NEWNYM command
- immediately, and otherwise not report a SIGNAL event for the
- command at all. Fixes bug 3349.
- - Fix a crash when handling the SIGNAL controller command or
- reporting ERR-level status events with bufferevents enabled. Found
- by Robert Ransom. Fixes bug 3367.
- - Always ship the tor-fw-helper manpage in our release tarballs.
- Fixes bug 3389. Reported by Stephen Walker.
- - Fix a class of double-mark-for-close bugs when bufferevents
- are enabled. Fixes bug 3403.
- - Update tor-fw-helper to support libnatpmp-20110618. Fixes bug 3434.
- - Add SIGNAL to the list returned by the 'GETINFO events/names'
- control-port command. Fixes part of bug 3465.
- - Prevent using negative indices during unit test runs when read_all()
- fails. Spotted by coverity.
- - Fix a rare memory leak when checking the nodelist without it being
- present. Found by coverity.
- - Only try to download a microdescriptor-flavored consensus from
- a directory cache that provides them.
- o Minor bugfixes (on 0.2.2.x and earlier):
- - Assert that hidden-service-related operations are not performed
- using single-hop circuits. Previously, Tor would assert that
- client-side streams are not attached to single-hop circuits,
- but not that other sensitive operations on the client and service
- side are not performed using single-hop circuits. Fixes bug 3332;
- bugfix on 0.0.6.
- - Don't publish a new relay descriptor when we reload our onion key,
- unless the onion key has actually changed. Fixes bug 3263 and
- resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
- - Allow GETINFO fingerprint to return a fingerprint even when
- we have not yet built a router descriptor. Fixes bug 3577;
- bugfix on 0.2.0.1-alpha.
- - Make 'tor --digests' list hashes of all Tor source files. Bugfix
- on 0.2.2.4-alpha; fixes bug 3427.
- o Code simplification and refactoring:
- - Use tor_sscanf() in place of scanf() in more places through the
- code. This makes us a little more locale-independent, and
- should help shut up code-analysis tools that can't tell
- a safe sscanf string from a dangerous one.
- - Use tt_assert(), not tor_assert(), for checking for test failures.
- This makes the unit tests more able to go on in the event that
- one of them fails.
- - Split connection_about_to_close() into separate functions for each
- connection type.
- o Build changes:
- - On Windows, we now define the _WIN32_WINNT macros only if they
- are not already defined. This lets the person building Tor decide,
- if they want, to require a later version of Windows.
- Changes in version 0.2.2.30-rc - 2011-07-07
- Tor 0.2.2.30-rc is the first release candidate for the Tor 0.2.2.x
- series. It fixes a few smaller bugs, but generally appears stable.
- Please test it and let us know whether it is!
- o Minor bugfixes:
- - Send a SUCCEEDED stream event to the controller when a reverse
- resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
- discovered by katmagic.
- - Always NUL-terminate the sun_path field of a sockaddr_un before
- passing it to the kernel. (Not a security issue: kernels are
- smart enough to reject bad sockaddr_uns.) Found by Coverity;
- CID #428. Bugfix on Tor 0.2.0.3-alpha.
- - Don't stack-allocate the list of supplementary GIDs when we're
- about to log them. Stack-allocating NGROUPS_MAX gid_t elements
- could take up to 256K, which is way too much stack. Found by
- Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
- - Add BUILDTIMEOUT_SET to the list returned by the 'GETINFO
- events/names' control-port command. Bugfix on 0.2.2.9-alpha;
- fixes part of bug 3465.
- - Fix a memory leak when receiving a descriptor for a hidden
- service we didn't ask for. Found by Coverity; CID #30. Bugfix
- on 0.2.2.26-beta.
- o Minor features:
- - Update to the July 1 2011 Maxmind GeoLite Country database.
- Changes in version 0.2.2.29-beta - 2011-06-20
- Tor 0.2.2.29-beta reverts an accidental behavior change for users who
- have bridge lines in their torrc but don't want to use them; gets
- us closer to having the control socket feature working on Debian;
- and fixes a variety of smaller bugs.
- o Major bugfixes:
- - Revert the UseBridges option to its behavior before 0.2.2.28-beta.
- When we changed the default behavior to "use bridges if any
- are listed in the torrc", we surprised users who had bridges
- in their torrc files but who didn't actually want to use them.
- Partial resolution for bug 3354.
- o Privacy fixes:
- - Don't attach new streams to old rendezvous circuits after SIGNAL
- NEWNYM. Previously, we would keep using an existing rendezvous
- circuit if it remained open (i.e. if it were kept open by a
- long-lived stream, or if a new stream were attached to it before
- Tor could notice that it was old and no longer in use). Bugfix on
- 0.1.1.15-rc; fixes bug 3375.
- o Minor bugfixes:
- - Fix a bug when using ControlSocketsGroupWritable with User. The
- directory's group would be checked against the current group, not
- the configured group. Patch by Jérémy Bobbio. Fixes bug 3393;
- bugfix on 0.2.2.26-beta.
- - Make connection_printf_to_buf()'s behavior sane. Its callers
- expect it to emit a CRLF iff the format string ends with CRLF;
- it actually emitted a CRLF iff (a) the format string ended with
- CRLF or (b) the resulting string was over 1023 characters long or
- (c) the format string did not end with CRLF *and* the resulting
- string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
- fixes part of bug 3407.
- - Make send_control_event_impl()'s behavior sane. Its callers
- expect it to always emit a CRLF at the end of the string; it
- might have emitted extra control characters as well. Bugfix on
- 0.1.1.9-alpha; fixes another part of bug 3407.
- - Make crypto_rand_int() check the value of its input correctly.
- Previously, it accepted values up to UINT_MAX, but could return a
- negative number if given a value above INT_MAX+1. Found by George
- Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
- - Avoid a segfault when reading a malformed circuit build state
- with more than INT_MAX entries. Found by wanoskarnet. Bugfix on
- 0.2.2.4-alpha.
- - When asked about a DNS record type we don't support via a
- client DNSPort, reply with NOTIMPL rather than an empty
- reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
- - Fix a rare memory leak during stats writing. Found by coverity.
- o Minor features:
- - Update to the June 1 2011 Maxmind GeoLite Country database.
- o Code simplifications and refactoring:
- - Remove some dead code as indicated by coverity.
- - Remove a few dead assignments during router parsing. Found by
- coverity.
- - Add some forgotten return value checks during unit tests. Found
- by coverity.
- - Don't use 1-bit wide signed bit fields. Found by coverity.
- Changes in version 0.2.2.28-beta - 2011-06-04
- Tor 0.2.2.28-beta makes great progress towards a new stable release: we
- fixed a big bug in whether relays stay in the consensus consistently,
- we moved closer to handling bridges and hidden services correctly,
- and we started the process of better handling the dreaded "my Vidalia
- died, and now my Tor demands a password when I try to reconnect to it"
- usability issue.
- o Major bugfixes:
- - Don't decide to make a new descriptor when receiving a HUP signal.
- This bug has caused a lot of 0.2.2.x relays to disappear from the
- consensus periodically. Fixes the most common case of triggering
- bug 1810; bugfix on 0.2.2.7-alpha.
- - Actually allow nameservers with IPv6 addresses. Fixes bug 2574.
- - Don't try to build descriptors if "ORPort auto" is set and we
- don't know our actual ORPort yet. Fix for bug 3216; bugfix on
- 0.2.2.26-beta.
- - Resolve a crash that occurred when setting BridgeRelay to 1 with
- accounting enabled. Fixes bug 3228; bugfix on 0.2.2.18-alpha.
- - Apply circuit timeouts to opened hidden-service-related circuits
- based on the correct start time. Previously, we would apply the
- circuit build timeout based on time since the circuit's creation;
- it was supposed to be applied based on time since the circuit
- entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
- - Use the same circuit timeout for client-side introduction
- circuits as for other four-hop circuits, rather than the timeout
- for single-hop directory-fetch circuits; the shorter timeout may
- have been appropriate with the static circuit build timeout in
- 0.2.1.x and earlier, but caused many hidden service access attempts
- to fail with the adaptive CBT introduced in 0.2.2.2-alpha. Bugfix
- on 0.2.2.2-alpha; fixes another part of bug 1297.
- - In ticket 2511 we fixed a case where you could use an unconfigured
- bridge if you had configured it as a bridge the last time you ran
- Tor. Now fix another edge case: if you had configured it as a bridge
- but then switched to a different bridge via the controller, you
- would still be willing to use the old one. Bugfix on 0.2.0.1-alpha;
- fixes bug 3321.
- o Major features:
- - Add an __OwningControllerProcess configuration option and a
- TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
- that when it exits, Tor will shut down. Implements feature 3049.
- - If "UseBridges 1" is set and no bridges are configured, Tor will
- now refuse to build any circuits until some bridges are set.
- If "UseBridges auto" is set, Tor will use bridges if they are
- configured and we are not running as a server, but otherwise will
- make circuits as usual. The new default is "auto". Patch by anonym,
- so the Tails LiveCD can stop automatically revealing you as a Tor
- user on startup.
- o Minor bugfixes:
- - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
- - Remove a trailing asterisk from "exit-policy/default" in the
- output of the control port command "GETINFO info/names". Bugfix
- on 0.1.2.5-alpha.
- - Use a wide type to hold sockets when built for 64-bit Windows builds.
- Fixes bug 3270.
- - Warn when the user configures two HiddenServiceDir lines that point
- to the same directory. Bugfix on 0.0.6 (the version introducing
- HiddenServiceDir); fixes bug 3289.
- - Remove dead code from rend_cache_lookup_v2_desc_as_dir. Fixes
- part of bug 2748; bugfix on 0.2.0.10-alpha.
- - Log malformed requests for rendezvous descriptors as protocol
- warnings, not warnings. Also, use a more informative log message
- in case someone sees it at log level warning without prior
- info-level messages. Fixes the other part of bug 2748; bugfix
- on 0.2.0.10-alpha.
- - Clear the table recording the time of the last request for each
- hidden service descriptor from each HS directory on SIGNAL NEWNYM.
- Previously, we would clear our HS descriptor cache on SIGNAL
- NEWNYM, but if we had previously retrieved a descriptor (or tried
- to) from every directory responsible for it, we would refuse to
- fetch it again for up to 15 minutes. Bugfix on 0.2.2.25-alpha;
- fixes bug 3309.
- - Fix a log message that said "bits" while displaying a value in
- bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
- 0.2.0.1-alpha.
- - When checking for 1024-bit keys, check for 1024 bits, not 128
- bytes. This allows Tor to correctly discard keys of length 1017
- through 1023. Bugfix on 0.0.9pre5.
- o Minor features:
- - Relays now log the reason for publishing a new relay descriptor,
- so we have a better chance of hunting down instances of bug 1810.
- Resolves ticket 3252.
- - Revise most log messages that refer to nodes by nickname to
- instead use the "$key=nickname at address" format. This should be
- more useful, especially since nicknames are less and less likely
- to be unique. Resolves ticket 3045.
- - Log (at info level) when purging pieces of hidden-service-client
- state because of SIGNAL NEWNYM.
- o Removed options:
- - Remove undocumented option "-F" from tor-resolve: it hasn't done
- anything since 0.2.1.16-rc.
- Changes in version 0.2.2.27-beta - 2011-05-18
- Tor 0.2.2.27-beta fixes a bridge-related stability bug in the previous
- release, and also adds a few more general bugfixes.
- o Major bugfixes:
- - Fix a crash bug when changing bridges in a running Tor process.
- Fixes bug 3213; bugfix on 0.2.2.26-beta.
- - When the controller configures a new bridge, don't wait 10 to 60
- seconds before trying to fetch its descriptor. Bugfix on
- 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
- o Minor bugfixes:
- - Require that onion keys have exponent 65537 in microdescriptors too.
- Fixes more of bug 3207; bugfix on 0.2.2.26-beta.
- - Tor used to limit HttpProxyAuthenticator values to 48 characters.
- Changed the limit to 512 characters by removing base64 newlines.
- Fixes bug 2752. Fix by Michael Yakubovich.
- - When a client starts or stops using bridges, never use a circuit
- that was built before the configuration change. This behavior could
- put at risk a user who uses bridges to ensure that her traffic
- only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
- bug 3200.
- Changes in version 0.2.2.26-beta - 2011-05-17
- Tor 0.2.2.26-beta fixes a variety of potential privacy problems. It
- also introduces a new "socksport auto" approach that should make it
- easier to run multiple Tors on the same system, and does a lot of
- cleanup to get us closer to a release candidate.
- o Security/privacy fixes:
- - Replace all potentially sensitive memory comparison operations
- with versions whose runtime does not depend on the data being
- compared. This will help resist a class of attacks where an
- adversary can use variations in timing information to learn
- sensitive data. Fix for one case of bug 3122. (Safe memcmp
- implementation by Robert Ransom based partially on code by DJB.)
- - When receiving a hidden service descriptor, check that it is for
- the hidden service we wanted. Previously, Tor would store any
- hidden service descriptors that a directory gave it, whether it
- wanted them or not. This wouldn't have let an attacker impersonate
- a hidden service, but it did let directories pre-seed a client
- with descriptors that it didn't want. Bugfix on 0.0.6.
- - On SIGHUP, do not clear out all TrackHostExits mappings, client
- DNS cache entries, and virtual address mappings: that's what
- NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
- o Major features:
- - The options SocksPort, ControlPort, and so on now all accept a
- value "auto" that opens a socket on an OS-selected port. A
- new ControlPortWriteToFile option tells Tor to write its
- actual control port or ports to a chosen file. If the option
- ControlPortFileGroupReadable is set, the file is created as
- group-readable. Now users can run two Tor clients on the same
- system without needing to manually mess with parameters. Resolves
- part of ticket 3076.
- - Set SO_REUSEADDR on all sockets, not just listeners. This should
- help busy exit nodes avoid running out of useable ports just
- because all the ports have been used in the near past. Resolves
- issue 2850.
- o Minor features:
- - New "GETINFO net/listeners/(type)" controller command to return
- a list of addresses and ports that are bound for listeners for a
- given connection type. This is useful when the user has configured
- "SocksPort auto" and the controller needs to know which port got
- chosen. Resolves another part of ticket 3076.
- - Add a new ControlSocketsGroupWritable configuration option: when
- it is turned on, ControlSockets are group-writeable by the default
- group of the current user. Patch by Jérémy Bobbio; implements
- ticket 2972.
- - Tor now refuses to create a ControlSocket in a directory that is
- world-readable (or group-readable if ControlSocketsGroupWritable
- is 0). This is necessary because some operating systems do not
- enforce permissions on an AF_UNIX sockets. Permissions on the
- directory holding the socket, however, seems to work everywhere.
- - Rate-limit a warning about failures to download v2 networkstatus
- documents. Resolves part of bug 1352.
- - Backport code from 0.2.3.x that allows directory authorities to
- clean their microdescriptor caches. Needed to resolve bug 2230.
- - When an HTTPS proxy reports "403 Forbidden", we now explain
- what it means rather than calling it an unexpected status code.
- Closes bug 2503. Patch from Michael Yakubovich.
- - Update to the May 1 2011 Maxmind GeoLite Country database.
- o Minor bugfixes:
- - Authorities now clean their microdesc cache periodically and when
- reading from disk initially, not only when adding new descriptors.
- This prevents a bug where we could lose microdescriptors. Bugfix
- on 0.2.2.6-alpha. Fixes bug 2230.
- - Do not crash when our configuration file becomes unreadable, for
- example due to a permissions change, between when we start up
- and when a controller calls SAVECONF. Fixes bug 3135; bugfix
- on 0.0.9pre6.
- - Avoid a bug that would keep us from replacing a microdescriptor
- cache on Windows. (We would try to replace the file while still
- holding it open. That's fine on Unix, but Windows doesn't let us
- do that.) Bugfix on 0.2.2.6-alpha; bug found by wanoskarnet.
- - Add missing explanations for the authority-related torrc options
- RephistTrackTime, BridgePassword, and V3AuthUseLegacyKey in the
- man page. Resolves issue 2379.
- - As an authority, do not upload our own vote or signature set to
- ourself. It would tell us nothing new, and as of 0.2.2.24-alpha,
- it would get flagged as a duplicate. Resolves bug 3026.
- - Accept hidden service descriptors if we think we might be a hidden
- service directory, regardless of what our consensus says. This
- helps robustness, since clients and hidden services can sometimes
- have a more up-to-date view of the network consensus than we do,
- and if they think that the directory authorities list us a HSDir,
- we might actually be one. Related to bug 2732; bugfix on
- 0.2.0.10-alpha.
- - When a controller changes TrackHostExits, remove mappings for
- hosts that should no longer have their exits tracked. Bugfix on
- 0.1.0.1-rc.
- - When a controller changes VirtualAddrNetwork, remove any mappings
- for hosts that were automapped to the old network. Bugfix on
- 0.1.1.19-rc.
- - When a controller changes one of the AutomapHosts* options, remove
- any mappings for hosts that should no longer be automapped. Bugfix
- on 0.2.0.1-alpha.
- - Do not reset the bridge descriptor download status every time we
- re-parse our configuration or get a configuration change. Fixes
- bug 3019; bugfix on 0.2.0.3-alpha.
- o Minor bugfixes (code cleanup):
- - When loading the microdesc journal, remember its current size.
- In 0.2.2, this helps prevent the microdesc journal from growing
- without limit on authorities (who are the only ones to use it in
- 0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
- Fix posted by "cypherpunks."
- - The microdesc journal is supposed to get rebuilt only if it is
- at least _half_ the length of the store, not _twice_ the length
- of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
- - Fix a potential null-pointer dereference while computing a
- consensus. Bugfix on 0.2.0.3-alpha, found with the help of
- clang's analyzer.
- - Avoid a possible null-pointer dereference when rebuilding the mdesc
- cache without actually having any descriptors to cache. Bugfix on
- 0.2.2.6-alpha. Issue discovered using clang's static analyzer.
- - If we fail to compute the identity digest of a v3 legacy keypair,
- warn, and don't use a buffer-full of junk instead. Bugfix on
- 0.2.1.1-alpha; fixes bug 3106.
- - Resolve an untriggerable issue in smartlist_string_num_isin(),
- where if the function had ever in the future been used to check
- for the presence of a too-large number, it would have given an
- incorrect result. (Fortunately, we only used it for 16-bit
- values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
- - Require that introduction point keys and onion handshake keys
- have a public exponent of 65537. Starts to fix bug 3207; bugfix
- on 0.2.0.10-alpha.
- o Removed features:
- - Caches no longer download and serve v2 networkstatus documents
- unless FetchV2Networkstatus flag is set: these documents haven't
- haven't been used by clients or relays since 0.2.0.x. Resolves
- bug 3022.
- Changes in version 0.2.3.1-alpha - 2011-05-05
- Tor 0.2.3.1-alpha adds some new experimental features, including support
- for an improved network IO backend, IOCP networking on Windows,
- microdescriptor caching, "fast-start" support for streams, and automatic
- home router configuration. There are also numerous internal improvements
- to try to make the code easier for developers to work with.
- This is the first alpha release in a new series, so expect there to be
- bugs. Users who would rather test out a more stable branch should
- stay with 0.2.2.x for now.
- o Major features:
- - Tor can now optionally build with the "bufferevents" buffered IO
- backend provided by Libevent 2. To use this feature, make sure you
- have the latest possible version of Libevent, and pass the
- --enable-bufferevents flag to configure when building Tor from
- source. This feature will make our networking code more flexible,
- let us stack layers on each other, and let us use more efficient
- zero-copy transports where available.
- - As an experimental feature, Tor can use IOCP for networking on Windows.
- Once this code is tuned and optimized, it promises much better
- performance than the select-based backend we've used in the past. To
- try this feature, you must build Tor with Libevent 2, configure Tor
- with the "bufferevents" buffered IO backend, and add "DisableIOCP 0" to
- your torrc. There are known bugs here: only try this if you can help
- debug it as it breaks.
- - The EntryNodes option can now include country codes like {de} or IP
- addresses or network masks. Previously we had disallowed these options
- because we didn't have an efficient way to keep the list up to
- date. Fixes bug 1982, but see bug 2798 for an unresolved issue here.
- - Exit nodes now accept and queue data on not-yet-connected streams.
- Previously, the client wasn't allowed to send data until the stream was
- connected, which slowed down all connections. This change will enable
- clients to perform a "fast-start" on streams and send data without
- having to wait for a confirmation that the stream has opened. (Patch
- from Ian Goldberg; implements the server side of Proposal 174.)
- - Tor now has initial support for automatic port mapping on the many
- home routers that support NAT-PMP or UPnP. (Not yet supported on
- Windows). To build the support code, you'll need to have libnatpnp
- library and/or the libminiupnpc library, and you'll need to enable the
- feature specifically by passing "--enable-upnp" and/or
- "--enable-natpnp" to configure. To turn it on, use the new
- PortForwarding option.
- - Caches now download, cache, and serve multiple "flavors" of the
- consensus, including a flavor that describes microdescriptors.
- - Caches now download, cache, and serve microdescriptors -- small
- summaries of router descriptors that are authenticated by all of the
- directory authorities. Once enough caches are running this code,
- clients will be able to save significant amounts of directory bandwidth
- by downloading microdescriptors instead of router descriptors.
- o Minor features:
- - Make logging resolution configurable with a new LogTimeGranularity
- option, and change the default from 1 millisecond to 1 second.
- Implements enhancement 1668.
- - We log which torrc file we're using on startup. Implements ticket
- 2444.
- - Ordinarily, Tor does not count traffic from private addresses (like
- 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
- There is now a new option, CountPrivateBandwidth, to disable this
- behavior. Patch from Daniel Cagara.
- - New --enable-static-tor configure option for building Tor as
- statically as possible. Idea, general hackery and thoughts from
- Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
- 2702.
- - If you set the NumCPUs option to 0, Tor will now try to detect how
- many CPUs you have. This is the new default behavior.
- - Turn on directory request statistics by default and include them in
- extra-info descriptors. Don't break if we have no GeoIP database.
- - Relays that set "ConnDirectionStatistics 1" write statistics on the
- bidirectional use of connections to disk every 24 hours.
- - Add a GeoIP file digest to the extra-info descriptor. Implements
- enhancement 1883.
- - The NodeFamily option -- which let you declare that you want to
- consider nodes to be part of a family whether they list themselves
- that way or not -- now allows IP address ranges and country codes.
- - Add a new 'Heartbeat' log message type to periodically log a message
- describing Tor's status at level Notice. This feature is meant for
- operators who log at notice, and want to make sure that their Tor
- server is still working. Implementation by George Kadianakis.
- o Minor bugfixes (on 0.2.2.25-alpha):
- - When loading the microdesc journal, remember its current size.
- In 0.2.2, this helps prevent the microdesc journal from growing
- without limit on authorities (who are the only ones to use it in
- 0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
- Fix posted by "cypherpunks."
- - The microdesc journal is supposed to get rebuilt only if it is
- at least _half_ the length of the store, not _twice_ the length
- of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
- - If as an authority we fail to compute the identity digest of a v3
- legacy keypair, warn, and don't use a buffer-full of junk instead.
- Bugfix on 0.2.1.1-alpha; fixes bug 3106.
- - Authorities now clean their microdesc cache periodically and when
- reading from disk initially, not only when adding new descriptors.
- This prevents a bug where we could lose microdescriptors. Bugfix
- on 0.2.2.6-alpha.
- o Minor features (controller):
- - Add a new SIGNAL event to the controller interface so that
- controllers can be notified when Tor handles a signal. Resolves
- issue 1955. Patch by John Brooks.
- - Add a new GETINFO option to get total bytes read and written. Patch
- from pipe, revised by atagar. Resolves ticket 2345.
- - Implement some GETINFO controller fields to provide information about
- the Tor process's pid, euid, username, and resource limits.
- o Build changes:
- - Our build system requires automake 1.6 or later to create the
- Makefile.in files. Previously, you could have used 1.4.
- This only affects developers and people building Tor from git;
- people who build Tor from the source distribution without changing
- the Makefile.am files should be fine.
- - Our autogen.sh script uses autoreconf to launch autoconf, automake, and
- so on. This is more robust against some of the failure modes
- associated with running the autotools pieces on their own.
- o Minor packaging issues:
- - On OpenSUSE, create the /var/run/tor directory on startup if it is not
- already created. Patch from Andreas Stieger. Fixes bug 2573.
- o Code simplifications and refactoring:
- - A major revision to our internal node-selecting and listing logic.
- Tor already had at least two major ways to look at the question of
- "which Tor servers do we know about": a list of router descriptors,
- and a list of entries in the current consensus. With
- microdescriptors, we're adding a third. Having so many systems
- without an abstraction layer over them was hurting the codebase.
- Now, we have a new "node_t" abstraction that presents a consistent
- interface to a client's view of a Tor node, and holds (nearly) all
- of the mutable state formerly in routerinfo_t and routerstatus_t.
- - The helper programs tor-gencert, tor-resolve, and tor-checkkey
- no longer link against Libevent: they never used it, but
- our library structure used to force them to link it.
- o Removed features:
- - Remove some old code to work around even older versions of Tor that
- used forked processes to handle DNS requests. Such versions of Tor
- are no longer in use as servers.
- o Documentation fixes:
- - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
- - Add missing documentation for the authority-related torrc options
- RephistTrackTime, BridgePassword, and V3AuthUseLegacyKey. Resolves
- issue 2379.
- Changes in version 0.2.2.25-alpha - 2011-04-29
- Tor 0.2.2.25-alpha fixes many bugs: hidden service clients are more
- robust, routers no longer overreport their bandwidth, Win7 should crash
- a little less, and NEWNYM (as used by Vidalia's "new identity" button)
- now prevents hidden service-related activity from being linkable. It
- provides more information to Vidalia so you can see if your bridge is
- working. Also, 0.2.2.25-alpha revamps the Entry/Exit/ExcludeNodes and
- StrictNodes configuration options to make them more reliable, more
- understandable, and more regularly applied. If you use those options,
- please see the revised documentation for them in the manual page.
- o Major bugfixes:
- - Relays were publishing grossly inflated bandwidth values because
- they were writing their state files wrong--now they write the
- correct value. Also, resume reading bandwidth history from the
- state file correctly. Fixes bug 2704; bugfix on 0.2.2.23-alpha.
- - Improve hidden service robustness: When we find that we have
- extended a hidden service's introduction circuit to a relay not
- listed as an introduction point in the HS descriptor we currently
- have, retry with an introduction point from the current
- descriptor. Previously we would just give up. Fixes bugs 1024 and
- 1930; bugfix on 0.2.0.10-alpha.
- - Clients now stop trying to use an exit node associated with a given
- destination by TrackHostExits if they fail to reach that exit node.
- Fixes bug 2999. Bugfix on 0.2.0.20-rc.
- - Fix crash bug on platforms where gmtime and localtime can return
- NULL. Windows 7 users were running into this one. Fixes part of bug
- 2077. Bugfix on all versions of Tor. Found by boboper.
- o Security and stability fixes:
- - Don't double-free a parsable, but invalid, microdescriptor, even if
- it is followed in the blob we're parsing by an unparsable
- microdescriptor. Fixes an issue reported in a comment on bug 2954.
- Bugfix on 0.2.2.6-alpha; fix by "cypherpunks".
- - If the Nickname configuration option isn't given, Tor would pick a
- nickname based on the local hostname as the nickname for a relay.
- Because nicknames are not very important in today's Tor and the
- "Unnamed" nickname has been implemented, this is now problematic
- behavior: It leaks information about the hostname without being
- useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
- introduced the Unnamed nickname. Reported by tagnaq.
- - Fix an uncommon assertion failure when running with DNSPort under
- heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
- - Avoid linkability based on cached hidden service descriptors: forget
- all hidden service descriptors cached as a client when processing a
- SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
- o Major features:
- - Export GeoIP information on bridge usage to controllers even if we
- have not yet been running for 24 hours. Now Vidalia bridge operators
- can get more accurate and immediate feedback about their
- contributions to the network.
- o Major features and bugfixes (node selection):
- - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
- ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and StrictNodes
- options. Previously, we had been ambiguous in describing what
- counted as an "exit" node, and what operations exactly "StrictNodes
- 0" would permit. This created confusion when people saw nodes built
- through unexpected circuits, and made it hard to tell real bugs from
- surprises. Now the intended behavior is:
- . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
- a node that delivers user traffic outside the Tor network.
- . "Entry", in the context of EntryNodes, means a node used as the
- first hop of a multihop circuit. It doesn't include direct
- connections to directory servers.
- . "ExcludeNodes" applies to all nodes.
- . "StrictNodes" changes the behavior of ExcludeNodes only. When
- StrictNodes is set, Tor should avoid all nodes listed in
- ExcludeNodes, even when it will make user requests fail. When
- StrictNodes is *not* set, then Tor should follow ExcludeNodes
- whenever it can, except when it must use an excluded node to
- perform self-tests, connect to a hidden service, provide a
- hidden service, fulfill a .exit request, upload directory
- information, or fetch directory information.
- Collectively, the changes to implement the behavior fix bug 1090.
- - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
- a node is listed in both, it's treated as excluded.
- - ExcludeNodes now applies to directory nodes -- as a preference if
- StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
- Don't exclude all the directory authorities and set StrictNodes to 1
- unless you really want your Tor to break.
- - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
- - ExcludeExitNodes now overrides .exit requests.
- - We don't use bridges listed in ExcludeNodes.
- - When StrictNodes is 1:
- . We now apply ExcludeNodes to hidden service introduction points
- and to rendezvous points selected by hidden service users. This
- can make your hidden service less reliable: use it with caution!
- . If we have used ExcludeNodes on ourself, do not try relay
- reachability self-tests.
- . If we have excluded all the directory authorities, we will not
- even try to upload our descriptor if we're a relay.
- . Do not honor .exit requests to an excluded node.
- - Remove a misfeature that caused us to ignore the Fast/Stable flags
- when ExitNodes is set. Bugfix on 0.2.2.7-alpha.
- - When the set of permitted nodes changes, we now remove any mappings
- introduced via TrackExitHosts to now-excluded nodes. Bugfix on
- 0.1.0.1-rc.
- - We never cannibalize a circuit that had excluded nodes on it, even
- if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
- - Revert a change where we would be laxer about attaching streams to
- circuits than when building the circuits. This was meant to prevent
- a set of bugs where streams were never attachable, but our improved
- code here should make this unnecessary. Bugfix on 0.2.2.7-alpha.
- - Keep track of how many times we launch a new circuit to handle a
- given stream. Too many launches could indicate an inconsistency
- between our "launch a circuit to handle this stream" logic and our
- "attach this stream to one of the available circuits" logic.
- - Improve log messages related to excluded nodes.
- o Minor bugfixes:
- - Fix a spurious warning when moving from a short month to a long
- month on relays with month-based BandwidthAccounting. Bugfix on
- 0.2.2.17-alpha; fixes bug 3020.
- - When a client finds that an origin circuit has run out of 16-bit
- stream IDs, we now mark it as unusable for new streams. Previously,
- we would try to close the entire circuit. Bugfix on 0.0.6.
- - Add a forgotten cast that caused a compile warning on OS X 10.6.
- Bugfix on 0.2.2.24-alpha.
- - Be more careful about reporting the correct error from a failed
- connect() system call. Under some circumstances, it was possible to
- look at an incorrect value for errno when sending the end reason.
- Bugfix on 0.1.0.1-rc.
- - Correctly handle an "impossible" overflow cases in connection byte
- counting, where we write or read more than 4GB on an edge connection
- in a single second. Bugfix on 0.1.2.8-beta.
- - Correct the warning displayed when a rendezvous descriptor exceeds
- the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
- John Brooks.
- - Clients and hidden services now use HSDir-flagged relays for hidden
- service descriptor downloads and uploads even if the relays have no
- DirPort set and the client has disabled TunnelDirConns. This will
- eventually allow us to give the HSDir flag to relays with no
- DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
- - Downgrade "no current certificates known for authority" message from
- Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
- - Make the SIGNAL DUMP control-port command work on FreeBSD. Fixes bug
- 2917. Bugfix on 0.1.1.1-alpha.
- - Only limit the lengths of single HS descriptors, even when multiple
- HS descriptors are published to an HSDir relay in a single POST
- operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
- - Write the current time into the LastWritten line in our state file,
- rather than the time from the previous write attempt. Also, stop
- trying to use a time of -1 in our log statements. Fixes bug 3039;
- bugfix on 0.2.2.14-alpha.
- - Be more consistent in our treatment of file system paths. "~" should
- get expanded to the user's home directory in the Log config option.
- Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
- feature for the -f and --DataDirectory options.
- o Minor features:
- - Make sure every relay writes a state file at least every 12 hours.
- Previously, a relay could go for weeks without writing its state
- file, and on a crash could lose its bandwidth history, capacity
- estimates, client country statistics, and so on. Addresses bug 3012.
- - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
- Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
- clients are already deprecated because of security bugs.
- - Don't allow v0 hidden service authorities to act as clients.
- Required by fix for bug 3000.
- - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
- by fix for bug 3000.
- - Ensure that no empty [dirreq-](read|write)-history lines are added
- to an extrainfo document. Implements ticket 2497.
- o Code simplification and refactoring:
- - Remove workaround code to handle directory responses from servers
- that had bug 539 (they would send HTTP status 503 responses _and_
- send a body too). Since only server versions before
- 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
- keep the workaround in place.
- - Remove the old 'fuzzy time' logic. It was supposed to be used for
- handling calculations where we have a known amount of clock skew and
- an allowed amount of unknown skew. But we only used it in three
- places, and we never adjusted the known/unknown skew values. This is
- still something we might want to do someday, but if we do, we'll
- want to do it differently.
- - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
- None of the cases where we did this before were wrong, but by making
- this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
- - Use GetTempDir to find the proper temporary directory location on
- Windows when generating temporary files for the unit tests. Patch by
- Gisle Vanem.
- Changes in version 0.2.2.24-alpha - 2011-04-08
- Tor 0.2.2.24-alpha fixes a variety of bugs, including a big bug that
- prevented Tor clients from effectively using "multihomed" bridges,
- that is, bridges that listen on multiple ports or IP addresses so users
- can continue to use some of their addresses even if others get blocked.
- o Major bugfixes:
- - Fix a bug where bridge users who configure the non-canonical
- address of a bridge automatically switch to its canonical
- address. If a bridge listens at more than one address, it should be
- able to advertise those addresses independently and any non-blocked
- addresses should continue to work. Bugfix on Tor 0.2.0.x. Fixes
- bug 2510.
- - If you configured Tor to use bridge A, and then quit and
- configured Tor to use bridge B instead, it would happily continue
- to use bridge A if it's still reachable. While this behavior is
- a feature if your goal is connectivity, in some scenarios it's a
- dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
- - Directory authorities now use data collected from their own
- uptime observations when choosing whether to assign the HSDir flag
- to relays, instead of trusting the uptime value the relay reports in
- its descriptor. This change helps prevent an attack where a small
- set of nodes with frequently-changing identity keys can blackhole
- a hidden service. (Only authorities need upgrade; others will be
- fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
- o Minor bugfixes:
- - When we restart our relay, we might get a successful connection
- from the outside before we've started our reachability tests,
- triggering a warning: "ORPort found reachable, but I have no
- routerinfo yet. Failing to inform controller of success." This
- bug was harmless unless Tor is running under a controller
- like Vidalia, in which case the controller would never get a
- REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
- fixes bug 1172.
- - Make directory authorities more accurate at recording when
- relays that have failed several reachability tests became
- unreachable, so we can provide more accuracy at assigning Stable,
- Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
- - Fix an issue that prevented static linking of libevent on
- some platforms (notably Linux). Fixes bug 2698; bugfix on
- versions 0.2.1.23/0.2.2.8-alpha (the versions introducing
- the --with-static-libevent configure option).
- - We now ask the other side of a stream (the client or the exit)
- for more data on that stream when the amount of queued data on
- that stream dips low enough. Previously, we wouldn't ask the
- other side for more data until either it sent us more data (which
- it wasn't supposed to do if it had exhausted its window!) or we
- had completely flushed all our queued data. This flow control fix
- should improve throughput. Fixes bug 2756; bugfix on the earliest
- released versions of Tor (svn commit r152).
- - Avoid a double-mark-for-free warning when failing to attach a
- transparent proxy connection. (We thought we had fixed this in
- 0.2.2.23-alpha, but it turns out our fix was checking the wrong
- connection.) Fixes bug 2757; bugfix on 0.1.2.1-alpha (the original
- bug) and 0.2.2.23-alpha (the incorrect fix).
- - When warning about missing zlib development packages during compile,
- give the correct package names. Bugfix on 0.2.0.1-alpha.
- o Minor features:
- - Directory authorities now log the source of a rejected POSTed v3
- networkstatus vote.
- - Make compilation with clang possible when using
- --enable-gcc-warnings by removing two warning options that clang
- hasn't implemented yet and by fixing a few warnings. Implements
- ticket 2696.
- - When expiring circuits, use microsecond timers rather than
- one-second timers. This can avoid an unpleasant situation where a
- circuit is launched near the end of one second and expired right
- near the beginning of the next, and prevent fluctuations in circuit
- timeout values.
- - Use computed circuit-build timeouts to decide when to launch
- parallel introduction circuits for hidden services. (Previously,
- we would retry after 15 seconds.)
- - Update to the April 1 2011 Maxmind GeoLite Country database.
- o Packaging fixes:
- - Create the /var/run/tor directory on startup on OpenSUSE if it is
- not already created. Patch from Andreas Stieger. Fixes bug 2573.
- o Documentation changes:
- - Modernize the doxygen configuration file slightly. Fixes bug 2707.
- - Resolve all doxygen warnings except those for missing documentation.
- Fixes bug 2705.
- - Add doxygen documentation for more functions, fields, and types.
- Changes in version 0.2.2.23-alpha - 2011-03-08
- Tor 0.2.2.23-alpha lets relays record their bandwidth history so when
- they restart they don't lose their bandwidth capacity estimate. This
- release also fixes a diverse set of user-facing bugs, ranging from
- relays overrunning their rate limiting to clients falsely warning about
- clock skew to bridge descriptor leaks by our bridge directory authority.
- o Major bugfixes:
- - Stop sending a CLOCK_SKEW controller status event whenever
- we fetch directory information from a relay that has a wrong clock.
- Instead, only inform the controller when it's a trusted authority
- that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
- the rest of bug 1074.
- - Fix an assert in parsing router descriptors containing IPv6
- addresses. This one took down the directory authorities when
- somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
- - Make the bridge directory authority refuse to answer directory
- requests for "all" descriptors. It used to include bridge
- descriptors in its answer, which was a major information leak.
- Found by "piebeer". Bugfix on 0.2.0.3-alpha.
- - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
- Tor would ignore their RelayBandwidthBurst setting,
- potentially using more bandwidth than expected. Bugfix on
- 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
- - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
- hidserv" in her torrc. The 'hidserv' argument never controlled
- publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
- o Major features:
- - Relays now save observed peak bandwidth throughput rates to their
- state file (along with total usage, which was already saved)
- so that they can determine their correct estimated bandwidth on
- restart. Resolves bug 1863, where Tor relays would reset their
- estimated bandwidth to 0 after restarting.
- - Directory authorities now take changes in router IP address and
- ORPort into account when determining router stability. Previously,
- if a router changed its IP or ORPort, the authorities would not
- treat it as having any downtime for the purposes of stability
- calculation, whereas clients would experience downtime since the
- change could take a while to propagate to them. Resolves issue 1035.
- - Enable Address Space Layout Randomization (ASLR) and Data Execution
- Prevention (DEP) by default on Windows to make it harder for
- attackers to exploit vulnerabilities. Patch from John Brooks.
- o Minor bugfixes (on 0.2.1.x and earlier):
- - Fix a rare crash bug that could occur when a client was configured
- with a large number of bridges. Fixes bug 2629; bugfix on
- 0.2.1.2-alpha. Bugfix by trac user "shitlei".
- - Avoid a double mark-for-free warning when failing to attach a
- transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
- bug 2279.
- - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
- found by "cypherpunks". This bug was introduced before the first
- Tor release, in svn commit r110.
- - Country codes aren't supported in EntryNodes until 0.2.3.x, so
- don't mention them in the manpage. Fixes bug 2450; issue
- spotted by keb and G-Lo.
- - Fix a bug in bandwidth history state parsing that could have been
- triggered if a future version of Tor ever changed the timing
- granularity at which bandwidth history is measured. Bugfix on
- Tor 0.1.1.11-alpha.
- - When a relay decides that its DNS is too broken for it to serve
- as an exit server, it advertised itself as a non-exit, but
- continued to act as an exit. This could create accidental
- partitioning opportunities for users. Instead, if a relay is
- going to advertise reject *:* as its exit policy, it should
- really act with exit policy "reject *:*". Fixes bug 2366.
- Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
- - In the special case where you configure a public exit relay as your
- bridge, Tor would be willing to use that exit relay as the last
- hop in your circuit as well. Now we fail that circuit instead.
- Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
- - Fix a bug with our locking implementation on Windows that couldn't
- correctly detect when a file was already locked. Fixes bug 2504,
- bugfix on 0.2.1.6-alpha.
- - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
- Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
- "piebeer".
- - Set target port in get_interface_address6() correctly. Bugfix
- on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
- - Directory authorities are now more robust to hops back in time
- when calculating router stability. Previously, if a run of uptime
- or downtime appeared to be negative, the calculation could give
- incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
- bug 1035.
- - Fix an assert that got triggered when using the TestingTorNetwork
- configuration option and then issuing a GETINFO config-text control
- command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
- o Minor bugfixes (on 0.2.2.x):
- - Clients should not weight BadExit nodes as Exits in their node
- selection. Similarly, directory authorities should not count BadExit
- bandwidth as Exit bandwidth when computing bandwidth-weights.
- Bugfix on 0.2.2.10-alpha; fixes bug 2203.
- - Correctly clear our dir_read/dir_write history when there is an
- error parsing any bw history value from the state file. Bugfix on
- Tor 0.2.2.15-alpha.
- - Resolve a bug in verifying signatures of directory objects
- with digests longer than SHA1. Bugfix on 0.2.2.20-alpha.
- Fixes bug 2409. Found by "piebeer".
- - Bridge authorities no longer crash on SIGHUP when they try to
- publish their relay descriptor to themselves. Fixes bug 2572. Bugfix
- on 0.2.2.22-alpha.
- o Minor features:
- - Log less aggressively about circuit timeout changes, and improve
- some other circuit timeout messages. Resolves bug 2004.
- - Log a little more clearly about the times at which we're no longer
- accepting new connections. Resolves bug 2181.
- - Reject attempts at the client side to open connections to private
- IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
- a randomly chosen exit node. Attempts to do so are always
- ill-defined, generally prevented by exit policies, and usually
- in error. This will also help to detect loops in transparent
- proxy configurations. You can disable this feature by setting
- "ClientRejectInternalAddresses 0" in your torrc.
- - Always treat failure to allocate an RSA key as an unrecoverable
- allocation error.
- - Update to the March 1 2011 Maxmind GeoLite Country database.
- o Minor features (log subsystem):
- - Add documentation for configuring logging at different severities in
- different log domains. We've had this feature since 0.2.1.1-alpha,
- but for some reason it never made it into the manpage. Fixes
- bug 2215.
- - Make it simpler to specify "All log domains except for A and B".
- Previously you needed to say "[*,~A,~B]". Now you can just say
- "[~A,~B]".
- - Add a "LogMessageDomains 1" option to include the domains of log
- messages along with the messages. Without this, there's no way
- to use log domains without reading the source or doing a lot
- of guessing.
- o Packaging changes:
- - Stop shipping the Tor specs files and development proposal documents
- in the tarball. They are now in a separate git repository at
- git://git.torproject.org/torspec.git
- Changes in version 0.2.1.30 - 2011-02-23
- Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
- change is a slight tweak to Tor's TLS handshake that makes relays
- and bridges that run this new version reachable from Iran again.
- We don't expect this tweak will win the arms race long-term, but it
- buys us time until we roll out a better solution.
- o Major bugfixes:
- - Stop sending a CLOCK_SKEW controller status event whenever
- we fetch directory information from a relay that has a wrong clock.
- Instead, only inform the controller when it's a trusted authority
- that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
- the rest of bug 1074.
- - Fix a bounds-checking error that could allow an attacker to
- remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
- Found by "piebeer".
- - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
- Tor would ignore their RelayBandwidthBurst setting,
- potentially using more bandwidth than expected. Bugfix on
- 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
- - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
- hidserv" in her torrc. The 'hidserv' argument never controlled
- publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
- o Minor features:
- - Adjust our TLS Diffie-Hellman parameters to match those used by
- Apache's mod_ssl.
- - Update to the February 1 2011 Maxmind GeoLite Country database.
- o Minor bugfixes:
- - Check for and reject overly long directory certificates and
- directory tokens before they have a chance to hit any assertions.
- Bugfix on 0.2.1.28. Found by "doorss".
- - Bring the logic that gathers routerinfos and assesses the
- acceptability of circuits into line. This prevents a Tor OP from
- getting locked in a cycle of choosing its local OR as an exit for a
- path (due to a .exit request) and then rejecting the circuit because
- its OR is not listed yet. It also prevents Tor clients from using an
- OR running in the same instance as an exit (due to a .exit request)
- if the OR does not meet the same requirements expected of an OR
- running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
- o Packaging changes:
- - Stop shipping the Tor specs files and development proposal documents
- in the tarball. They are now in a separate git repository at
- git://git.torproject.org/torspec.git
- - Do not include Git version tags as though they are SVN tags when
- generating a tarball from inside a repository that has switched
- between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
- Changes in version 0.2.2.22-alpha - 2011-01-25
- Tor 0.2.2.22-alpha fixes a few more less-critical security issues. The
- main other change is a slight tweak to Tor's TLS handshake that makes
- relays and bridges that run this new version reachable from Iran again.
- We don't expect this tweak will win the arms race long-term, but it
- will buy us a bit more time until we roll out a better solution.
- o Major bugfixes:
- - Fix a bounds-checking error that could allow an attacker to
- remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
- Found by "piebeer".
- - Don't assert when changing from bridge to relay or vice versa
- via the controller. The assert happened because we didn't properly
- initialize our keys in this case. Bugfix on 0.2.2.18-alpha; fixes
- bug 2433. Reported by bastik.
- o Minor features:
- - Adjust our TLS Diffie-Hellman parameters to match those used by
- Apache's mod_ssl.
- - Provide a log message stating which geoip file we're parsing
- instead of just stating that we're parsing the geoip file.
- Implements ticket 2432.
- o Minor bugfixes:
- - Check for and reject overly long directory certificates and
- directory tokens before they have a chance to hit any assertions.
- Bugfix on 0.2.1.28 / 0.2.2.20-alpha. Found by "doorss".
- Changes in version 0.2.2.21-alpha - 2011-01-15
- Tor 0.2.2.21-alpha includes all the patches from Tor 0.2.1.29, which
- continues our recent code security audit work. The main fix resolves
- a remote heap overflow vulnerability that can allow remote code
- execution (CVE-2011-0427). Other fixes address a variety of assert
- and crash bugs, most of which we think are hard to exploit remotely.
- o Major bugfixes (security), also included in 0.2.1.29:
- - Fix a heap overflow bug where an adversary could cause heap
- corruption. This bug probably allows remote code execution
- attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
- 0.1.2.10-rc.
- - Prevent a denial-of-service attack by disallowing any
- zlib-compressed data whose compression factor is implausibly
- high. Fixes part of bug 2324; reported by "doorss".
- - Zero out a few more keys in memory before freeing them. Fixes
- bug 2384 and part of bug 2385. These key instances found by
- "cypherpunks", based on Andrew Case's report about being able
- to find sensitive data in Tor's memory space if you have enough
- permissions. Bugfix on 0.0.2pre9.
- o Major bugfixes (crashes), also included in 0.2.1.29:
- - Prevent calls to Libevent from inside Libevent log handlers.
- This had potential to cause a nasty set of crashes, especially
- if running Libevent with debug logging enabled, and running
- Tor with a controller watching for low-severity log messages.
- Bugfix on 0.1.0.2-rc. Fixes bug 2190.
- - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
- underflow errors there too. Fixes the other part of bug 2324.
- - Fix a bug where we would assert if we ever had a
- cached-descriptors.new file (or another file read directly into
- memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
- on 0.2.1.25. Found by doorss.
- - Fix some potential asserts and parsing issues with grossly
- malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
- Found by doorss.
- o Minor bugfixes (other), also included in 0.2.1.29:
- - Fix a bug with handling misformed replies to reverse DNS lookup
- requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
- bug reported by doorss.
- - Fix compilation on mingw when a pthreads compatibility library
- has been installed. (We don't want to use it, so we shouldn't
- be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
- - Fix a bug where we would declare that we had run out of virtual
- addresses when the address space was only half-exhausted. Bugfix
- on 0.1.2.1-alpha.
- - Correctly handle the case where AutomapHostsOnResolve is set but
- no virtual addresses are available. Fixes bug 2328; bugfix on
- 0.1.2.1-alpha. Bug found by doorss.
- - Correctly handle wrapping around when we run out of virtual
- address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
- o Minor features, also included in 0.2.1.29:
- - Update to the January 1 2011 Maxmind GeoLite Country database.
- - Introduce output size checks on all of our decryption functions.
- o Build changes, also included in 0.2.1.29:
- - Tor does not build packages correctly with Automake 1.6 and earlier;
- added a check to Makefile.am to make sure that we're building with
- Automake 1.7 or later.
- - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
- because we built it with a too-old version of automake. Thus that
- release broke ./configure --enable-openbsd-malloc, which is popular
- among really fast exit relays on Linux.
- o Major bugfixes, new in 0.2.2.21-alpha:
- - Prevent crash/heap corruption when the cbtnummodes consensus
- parameter is set to 0 or large values. Fixes bug 2317; bugfix
- on 0.2.2.14-alpha.
- o Major features, new in 0.2.2.21-alpha:
- - Introduce minimum/maximum values that clients will believe
- from the consensus. Now we'll have a better chance to avoid crashes
- or worse when a consensus param has a weird value.
- o Minor features, new in 0.2.2.21-alpha:
- - Make sure to disable DirPort if running as a bridge. DirPorts aren't
- used on bridges, and it makes bridge scanning somewhat easier.
- - If writing the state file to disk fails, wait up to an hour before
- retrying again, rather than trying again each second. Fixes bug
- 2346; bugfix on Tor 0.1.1.3-alpha.
- - Make Libevent log messages get delivered to controllers later,
- and not from inside the Libevent log handler. This prevents unsafe
- reentrant Libevent calls while still letting the log messages
- get through.
- - Detect platforms that brokenly use a signed size_t, and refuse to
- build there. Found and analyzed by doorss and rransom.
- - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
- Resolves bug 2314.
- o Minor bugfixes, new in 0.2.2.21-alpha:
- - Handle SOCKS messages longer than 128 bytes long correctly, rather
- than waiting forever for them to finish. Fixes bug 2330; bugfix
- on 0.2.0.16-alpha. Found by doorss.
- - Add assertions to check for overflow in arguments to
- base32_encode() and base32_decode(); fix a signed-unsigned
- comparison there too. These bugs are not actually reachable in Tor,
- but it's good to prevent future errors too. Found by doorss.
- - Correctly detect failures to create DNS requests when using Libevent
- versions before v2. (Before Libevent 2, we used our own evdns
- implementation. Its return values for Libevent's evdns_resolve_*()
- functions are not consistent with those from Libevent.) Fixes bug
- 2363; bugfix on 0.2.2.6-alpha. Found by "lodger".
- o Documentation, new in 0.2.2.21-alpha:
- - Document the default socks host and port (127.0.0.1:9050) for
- tor-resolve.
- Changes in version 0.2.1.29 - 2011-01-15
- Tor 0.2.1.29 continues our recent code security audit work. The main
- fix resolves a remote heap overflow vulnerability that can allow remote
- code execution. Other fixes address a variety of assert and crash bugs,
- most of which we think are hard to exploit remotely.
- o Major bugfixes (security):
- - Fix a heap overflow bug where an adversary could cause heap
- corruption. This bug probably allows remote code execution
- attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
- 0.1.2.10-rc.
- - Prevent a denial-of-service attack by disallowing any
- zlib-compressed data whose compression factor is implausibly
- high. Fixes part of bug 2324; reported by "doorss".
- - Zero out a few more keys in memory before freeing them. Fixes
- bug 2384 and part of bug 2385. These key instances found by
- "cypherpunks", based on Andrew Case's report about being able
- to find sensitive data in Tor's memory space if you have enough
- permissions. Bugfix on 0.0.2pre9.
- o Major bugfixes (crashes):
- - Prevent calls to Libevent from inside Libevent log handlers.
- This had potential to cause a nasty set of crashes, especially
- if running Libevent with debug logging enabled, and running
- Tor with a controller watching for low-severity log messages.
- Bugfix on 0.1.0.2-rc. Fixes bug 2190.
- - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
- underflow errors there too. Fixes the other part of bug 2324.
- - Fix a bug where we would assert if we ever had a
- cached-descriptors.new file (or another file read directly into
- memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
- on 0.2.1.25. Found by doorss.
- - Fix some potential asserts and parsing issues with grossly
- malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
- Found by doorss.
- o Minor bugfixes (other):
- - Fix a bug with handling misformed replies to reverse DNS lookup
- requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
- bug reported by doorss.
- - Fix compilation on mingw when a pthreads compatibility library
- has been installed. (We don't want to use it, so we shouldn't
- be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
- - Fix a bug where we would declare that we had run out of virtual
- addresses when the address space was only half-exhausted. Bugfix
- on 0.1.2.1-alpha.
- - Correctly handle the case where AutomapHostsOnResolve is set but
- no virtual addresses are available. Fixes bug 2328; bugfix on
- 0.1.2.1-alpha. Bug found by doorss.
- - Correctly handle wrapping around to when we run out of virtual
- address space. Found by cypherpunks, bugfix on 0.2.0.5-alpha.
- - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
- because we built it with a too-old version of automake. Thus that
- release broke ./configure --enable-openbsd-malloc, which is popular
- among really fast exit relays on Linux.
- o Minor features:
- - Update to the January 1 2011 Maxmind GeoLite Country database.
- - Introduce output size checks on all of our decryption functions.
- o Build changes:
- - Tor does not build packages correctly with Automake 1.6 and earlier;
- added a check to Makefile.am to make sure that we're building with
- Automake 1.7 or later.
- Changes in version 0.2.2.20-alpha - 2010-12-17
- Tor 0.2.2.20-alpha does some code cleanup to reduce the risk of remotely
- exploitable bugs. We also fix a variety of other significant bugs,
- change the IP address for one of our directory authorities, and update
- the minimum version that Tor relays must run to join the network.
- o Major bugfixes:
- - Fix a remotely exploitable bug that could be used to crash instances
- of Tor remotely by overflowing on the heap. Remote-code execution
- hasn't been confirmed, but can't be ruled out. Everyone should
- upgrade. Bugfix on the 0.1.1 series and later.
- - Fix a bug that could break accounting on 64-bit systems with large
- time_t values, making them hibernate for impossibly long intervals.
- Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
- - Fix a logic error in directory_fetches_from_authorities() that
- would cause all _non_-exits refusing single-hop-like circuits
- to fetch from authorities, when we wanted to have _exits_ fetch
- from authorities. Fixes more of 2097. Bugfix on 0.2.2.16-alpha;
- fix by boboper.
- - Fix a stream fairness bug that would cause newer streams on a given
- circuit to get preference when reading bytes from the origin or
- destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
- introduced before the first Tor release, in svn revision r152.
- o Directory authority changes:
- - Change IP address and ports for gabelmoo (v3 directory authority).
- o Minor bugfixes:
- - Avoid crashes when AccountingMax is set on clients. Fixes bug 2235.
- Bugfix on 0.2.2.18-alpha. Diagnosed by boboper.
- - Fix an off-by-one error in calculating some controller command
- argument lengths. Fortunately, this mistake is harmless since
- the controller code does redundant NUL termination too. Found by
- boboper. Bugfix on 0.1.1.1-alpha.
- - Do not dereference NULL if a bridge fails to build its
- extra-info descriptor. Found by an anonymous commenter on
- Trac. Bugfix on 0.2.2.19-alpha.
- o Minor features:
- - Update to the December 1 2010 Maxmind GeoLite Country database.
- - Directory authorities now reject relays running any versions of
- Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
- known bugs that keep RELAY_EARLY cells from working on rendezvous
- circuits. Followup to fix for bug 2081.
- - Directory authorities now reject relays running any version of Tor
- older than 0.2.0.26-rc. That version is the earliest that fetches
- current directory information correctly. Fixes bug 2156.
- - Report only the top 10 ports in exit-port stats in order not to
- exceed the maximum extra-info descriptor length of 50 KB. Implements
- task 2196.
- Changes in version 0.2.1.28 - 2010-12-17
- Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
- exploitable bugs. We also took this opportunity to change the IP address
- for one of our directory authorities, and to update the geoip database
- we ship.
- o Major bugfixes:
- - Fix a remotely exploitable bug that could be used to crash instances
- of Tor remotely by overflowing on the heap. Remote-code execution
- hasn't been confirmed, but can't be ruled out. Everyone should
- upgrade. Bugfix on the 0.1.1 series and later.
- o Directory authority changes:
- - Change IP address and ports for gabelmoo (v3 directory authority).
- o Minor features:
- - Update to the December 1 2010 Maxmind GeoLite Country database.
- Changes in version 0.2.1.27 - 2010-11-23
- Yet another OpenSSL security patch broke its compatibility with Tor:
- Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
- also took this opportunity to fix several crash bugs, integrate a new
- directory authority, and update the bundled GeoIP database.
- o Major bugfixes:
- - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
- No longer set the tlsext_host_name extension on server SSL objects;
- but continue to set it on client SSL objects. Our goal in setting
- it was to imitate a browser, not a vhosting server. Fixes bug 2204;
- bugfix on 0.2.1.1-alpha.
- - Do not log messages to the controller while shrinking buffer
- freelists. Doing so would sometimes make the controller connection
- try to allocate a buffer chunk, which would mess up the internals
- of the freelist and cause an assertion failure. Fixes bug 1125;
- fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
- - Learn our external IP address when we're a relay or bridge, even if
- we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
- where we introduced bridge relays that don't need to publish to
- be useful. Fixes bug 2050.
- - Do even more to reject (and not just ignore) annotations on
- router descriptors received anywhere but from the cache. Previously
- we would ignore such annotations at first, but cache them to disk
- anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
- - When you're using bridges and your network goes away and your
- bridges get marked as down, recover when you attempt a new socks
- connection (if the network is back), rather than waiting up to an
- hour to try fetching new descriptors for your bridges. Bugfix on
- 0.2.0.3-alpha; fixes bug 1981.
- o Major features:
- - Move to the November 2010 Maxmind GeoLite country db (rather
- than the June 2009 ip-to-country GeoIP db) for our statistics that
- count how many users relays are seeing from each country. Now we'll
- have more accurate data, especially for many African countries.
- o New directory authorities:
- - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
- authority.
- o Minor bugfixes:
- - Fix an assertion failure that could occur in directory caches or
- bridge users when using a very short voting interval on a testing
- network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
- 0.2.0.8-alpha.
- - Enforce multiplicity rules when parsing annotations. Bugfix on
- 0.2.0.8-alpha. Found by piebeer.
- - Allow handshaking OR connections to take a full KeepalivePeriod
- seconds to handshake. Previously, we would close them after
- IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
- were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
- for analysis help.
- - When building with --enable-gcc-warnings on OpenBSD, disable
- warnings in system headers. This makes --enable-gcc-warnings
- pass on OpenBSD 4.8.
- o Minor features:
- - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
- and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
- stream ending reason for this case: END_STREAM_REASON_NOROUTE.
- Servers can start sending this code when enough clients recognize
- it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
- - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
- Patch from mingw-san.
- o Removed files:
- - Remove the old debian/ directory from the main Tor distribution.
- The official Tor-for-debian git repository lives at the URL
- https://git.torproject.org/debian/tor.git
- - Stop shipping the old doc/website/ directory in the tarball. We
- changed the website format in late 2010, and what we shipped in
- 0.2.1.26 really wasn't that useful anyway.
- Changes in version 0.2.2.19-alpha - 2010-11-22
- Yet another OpenSSL security patch broke its compatibility with Tor:
- Tor 0.2.2.19-alpha makes relays work with OpenSSL 0.9.8p and 1.0.0.b.
- o Major bugfixes:
- - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
- No longer set the tlsext_host_name extension on server SSL objects;
- but continue to set it on client SSL objects. Our goal in setting
- it was to imitate a browser, not a vhosting server. Fixes bug 2204;
- bugfix on 0.2.1.1-alpha.
- o Minor bugfixes:
- - Try harder not to exceed the maximum length of 50 KB when writing
- statistics to extra-info descriptors. This bug was triggered by very
- fast relays reporting exit-port, entry, and dirreq statistics.
- Reported by Olaf Selke. Bugfix on 0.2.2.1-alpha. Fixes bug 2183.
- - Publish a router descriptor even if generating an extra-info
- descriptor fails. Previously we would not publish a router
- descriptor without an extra-info descriptor; this can cause fast
- exit relays collecting exit-port statistics to drop from the
- consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
- Changes in version 0.2.2.18-alpha - 2010-11-16
- Tor 0.2.2.18-alpha fixes several crash bugs that have been nagging
- us lately, makes unpublished bridge relays able to detect their IP
- address, and fixes a wide variety of other bugs to get us much closer
- to a stable release.
- o Major bugfixes:
- - Do even more to reject (and not just ignore) annotations on
- router descriptors received anywhere but from the cache. Previously
- we would ignore such annotations at first, but cache them to disk
- anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
- - Do not log messages to the controller while shrinking buffer
- freelists. Doing so would sometimes make the controller connection
- try to allocate a buffer chunk, which would mess up the internals
- of the freelist and cause an assertion failure. Fixes bug 1125;
- fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
- - Learn our external IP address when we're a relay or bridge, even if
- we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
- where we introduced bridge relays that don't need to publish to
- be useful. Fixes bug 2050.
- - Maintain separate TLS contexts and certificates for incoming and
- outgoing connections in bridge relays. Previously we would use the
- same TLS contexts and certs for incoming and outgoing connections.
- Bugfix on 0.2.0.3-alpha; addresses bug 988.
- - Maintain separate identity keys for incoming and outgoing TLS
- contexts in bridge relays. Previously we would use the same
- identity keys for incoming and outgoing TLS contexts. Bugfix on
- 0.2.0.3-alpha; addresses the other half of bug 988.
- - Avoid an assertion failure when we as an authority receive a
- duplicate upload of a router descriptor that we already have,
- but which we previously considered an obsolete descriptor.
- Fixes another case of bug 1776. Bugfix on 0.2.2.16-alpha.
- - Avoid a crash bug triggered by looking at a dangling pointer while
- setting the network status consensus. Found by Robert Ransom.
- Bugfix on 0.2.2.17-alpha. Fixes bug 2097.
- - Fix a logic error where servers that _didn't_ act as exits would
- try to keep their server lists more aggressively up to date than
- exits, when it was supposed to be the other way around. Bugfix
- on 0.2.2.17-alpha.
- o Minor bugfixes (on Tor 0.2.1.x and earlier):
- - When we're trying to guess whether we know our IP address as
- a relay, we would log various ways that we failed to guess
- our address, but never log that we ended up guessing it
- successfully. Now add a log line to help confused and anxious
- relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
- - Bring the logic that gathers routerinfos and assesses the
- acceptability of circuits into line. This prevents a Tor OP from
- getting locked in a cycle of choosing its local OR as an exit for a
- path (due to a .exit request) and then rejecting the circuit because
- its OR is not listed yet. It also prevents Tor clients from using an
- OR running in the same instance as an exit (due to a .exit request)
- if the OR does not meet the same requirements expected of an OR
- running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
- - Correctly describe errors that occur when generating a TLS object.
- Previously we would attribute them to a failure while generating a
- TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
- bug 1994.
- - Enforce multiplicity rules when parsing annotations. Bugfix on
- 0.2.0.8-alpha. Found by piebeer.
- - Fix warnings that newer versions of autoconf produced during
- ./autogen.sh. These warnings appear to be harmless in our case,
- but they were extremely verbose. Fixes bug 2020.
- o Minor bugfixes (on Tor 0.2.2.x):
- - Enable protection of small arrays whenever we build with gcc
- hardening features, not only when also building with warnings
- enabled. Fixes bug 2031; bugfix on 0.2.2.14-alpha. Reported by keb.
- o Minor features:
- - Make hidden services work better in private Tor networks by not
- requiring any uptime to join the hidden service descriptor
- DHT. Implements ticket 2088.
- - Rate-limit the "your application is giving Tor only an IP address"
- warning. Addresses bug 2000; bugfix on 0.0.8pre2.
- - When AllowSingleHopExits is set, print a warning to explain to the
- relay operator why most clients are avoiding her relay.
- - Update to the November 1 2010 Maxmind GeoLite Country database.
- o Code simplifications and refactoring:
- - When we fixed bug 1038 we had to put in a restriction not to send
- RELAY_EARLY cells on rend circuits. This was necessary as long
- as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
- active. Now remove this obsolete check. Resolves bug 2081.
- - Some options used different conventions for uppercasing of acronyms
- when comparing manpage and source. Fix those in favor of the
- manpage, as it makes sense to capitalize acronyms.
- - Remove the torrc.complete file. It hasn't been kept up to date
- and users will have better luck checking out the manpage.
- - Remove the obsolete "NoPublish" option; it has been flagged
- as obsolete and has produced a warning since 0.1.1.18-rc.
- - Remove everything related to building the expert bundle for OS X.
- It has confused many users, doesn't work right on OS X 10.6,
- and is hard to get rid of once installed. Resolves bug 1274.
- Changes in version 0.2.2.17-alpha - 2010-09-30
- Tor 0.2.2.17-alpha introduces a feature to make it harder for clients
- to use one-hop circuits (which can put the exit relays at higher risk,
- plus unbalance the network); fixes a big bug in bandwidth accounting
- for relays that want to limit their monthly bandwidth use; fixes a
- big pile of bugs in how clients tolerate temporary network failure;
- and makes our adaptive circuit build timeout feature (which improves
- client performance if your network is fast while not breaking things
- if your network is slow) better handle bad networks.
- o Major features:
- - Exit relays now try harder to block exit attempts from unknown
- relays, to make it harder for people to use them as one-hop proxies
- a la tortunnel. Controlled by the refuseunknownexits consensus
- parameter (currently enabled), or you can override it on your
- relay with the RefuseUnknownExits torrc option. Resolves bug 1751.
- o Major bugfixes (0.2.1.x and earlier):
- - Fix a bug in bandwidth accounting that could make us use twice
- the intended bandwidth when our interval start changes due to
- daylight saving time. Now we tolerate skew in stored vs computed
- interval starts: if the start of the period changes by no more than
- 50% of the period's duration, we remember bytes that we transferred
- in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
- - Always search the Windows system directory for system DLLs, and
- nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
- - When you're using bridges and your network goes away and your
- bridges get marked as down, recover when you attempt a new socks
- connection (if the network is back), rather than waiting up to an
- hour to try fetching new descriptors for your bridges. Bugfix on
- 0.2.0.3-alpha; fixes bug 1981.
- o Major bugfixes (on 0.2.2.x):
- - Fix compilation on Windows. Bugfix on 0.2.2.16-alpha; related to
- bug 1797.
- - Fix a segfault that could happen when operating a bridge relay with
- no GeoIP database set. Fixes bug 1964; bugfix on 0.2.2.15-alpha.
- - The consensus bandwidth-weights (used by clients to choose fast
- relays) entered an unexpected edge case in September where
- Exits were much scarcer than Guards, resulting in bad weight
- recommendations. Now we compute them using new constraints that
- should succeed in all cases. Also alter directory authorities to
- not include the bandwidth-weights line if they fail to produce
- valid values. Fixes bug 1952; bugfix on 0.2.2.10-alpha.
- - When weighting bridges during path selection, we used to trust
- the bandwidths they provided in their descriptor, only capping them
- at 10MB/s. This turned out to be problematic for two reasons:
- Bridges could claim to handle a lot more traffic then they
- actually would, thus making more clients pick them and have a
- pretty effective DoS attack. The other issue is that new bridges
- that might not have a good estimate for their bw capacity yet
- would not get used at all unless no other bridges are available
- to a client. Fixes bug 1912; bugfix on 0.2.2.7-alpha.
- o Major bugfixes (on the circuit build timeout feature, 0.2.2.x):
- - Ignore cannibalized circuits when recording circuit build times.
- This should provide for a minor performance improvement for hidden
- service users using 0.2.2.14-alpha, and should remove two spurious
- notice log messages. Bugfix on 0.2.2.14-alpha; fixes bug 1740.
- - Simplify the logic that causes us to decide if the network is
- unavailable for purposes of recording circuit build times. If we
- receive no cells whatsoever for the entire duration of a circuit's
- full measured lifetime, the network is probably down. Also ignore
- one-hop directory fetching circuit timeouts when calculating our
- circuit build times. These changes should hopefully reduce the
- cases where we see ridiculous circuit build timeouts for people
- with spotty wireless connections. Fixes part of bug 1772; bugfix
- on 0.2.2.2-alpha.
- - Prevent the circuit build timeout from becoming larger than
- the maximum build time we have ever seen. Also, prevent the time
- period for measurement circuits from becoming larger than twice that
- value. Fixes the other part of bug 1772; bugfix on 0.2.2.2-alpha.
- o Minor features:
- - When we run out of directory information such that we can't build
- circuits, but then get enough that we can build circuits, log when
- we actually construct a circuit, so the user has a better chance of
- knowing what's going on. Fixes bug 1362.
- - Be more generous with how much bandwidth we'd use up (with
- accounting enabled) before entering "soft hibernation". Previously,
- we'd refuse new connections and circuits once we'd used up 95% of
- our allotment. Now, we use up 95% of our allotment, AND make sure
- that we have no more than 500MB (or 3 hours of expected traffic,
- whichever is lower) remaining before we enter soft hibernation.
- - If we've configured EntryNodes and our network goes away and/or all
- our entrynodes get marked down, optimistically retry them all when
- a new socks application request appears. Fixes bug 1882.
- - Add some more defensive programming for architectures that can't
- handle unaligned integer accesses. We don't know of any actual bugs
- right now, but that's the best time to fix them. Fixes bug 1943.
- - Support line continuations in the torrc config file. If a line
- ends with a single backslash character, the newline is ignored, and
- the configuration value is treated as continuing on the next line.
- Resolves bug 1929.
- o Minor bugfixes (on 0.2.1.x and earlier):
- - For bandwidth accounting, calculate our expected bandwidth rate
- based on the time during which we were active and not in
- soft-hibernation during the last interval. Previously, we were
- also considering the time spent in soft-hibernation. If this
- was a long time, we would wind up underestimating our bandwidth
- by a lot, and skewing our wakeup time towards the start of the
- accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
- o Minor bugfixes (on 0.2.2.x):
- - Resume generating CIRC FAILED REASON=TIMEOUT control port messages,
- which were disabled by the circuit build timeout changes in
- 0.2.2.14-alpha. Bugfix on 0.2.2.14-alpha; fixes bug 1739.
- - Make sure we don't warn about missing bandwidth weights when
- choosing bridges or other relays not in the consensus. Bugfix on
- 0.2.2.10-alpha; fixes bug 1805.
- - In our logs, do not double-report signatures from unrecognized
- authorities both as "from unknown authority" and "not
- present". Fixes bug 1956, bugfix on 0.2.2.16-alpha.
- Changes in version 0.2.2.16-alpha - 2010-09-17
- Tor 0.2.2.16-alpha fixes a variety of old stream fairness bugs (most
- evident at exit relays), and also continues to resolve all the little
- bugs that have been filling up trac lately.
- o Major bugfixes (stream-level fairness):
- - When receiving a circuit-level SENDME for a blocked circuit, try
- to package cells fairly from all the streams that had previously
- been blocked on that circuit. Previously, we had started with the
- oldest stream, and allowed each stream to potentially exhaust
- the circuit's package window. This gave older streams on any
- given circuit priority over newer ones. Fixes bug 1937. Detected
- originally by Camilo Viecco. This bug was introduced before the
- first Tor release, in svn commit r152: it is the new winner of
- the longest-lived bug prize.
- - When the exit relay got a circuit-level sendme cell, it started
- reading on the exit streams, even if had 500 cells queued in the
- circuit queue already, so the circuit queue just grew and grew in
- some cases. We fix this by not re-enabling reading on receipt of a
- sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
- on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
- "yetonetime".
- - Newly created streams were allowed to read cells onto circuits,
- even if the circuit's cell queue was blocked and waiting to drain.
- This created potential unfairness, as older streams would be
- blocked, but newer streams would gladly fill the queue completely.
- We add code to detect this situation and prevent any stream from
- getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
- fixes bug 1298.
- o Minor features:
- - Update to the September 1 2010 Maxmind GeoLite Country database.
- - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
- not. This would lead to a cookie that is still not group readable.
- Closes bug 1843. Suggested by katmagic.
- - When logging a rate-limited warning, we now mention how many messages
- got suppressed since the last warning.
- - Add new "perconnbwrate" and "perconnbwburst" consensus params to
- do individual connection-level rate limiting of clients. The torrc
- config options with the same names trump the consensus params, if
- both are present. Replaces the old "bwconnrate" and "bwconnburst"
- consensus params which were broken from 0.2.2.7-alpha through
- 0.2.2.14-alpha. Closes bug 1947.
- - When a router changes IP address or port, authorities now launch
- a new reachability test for it. Implements ticket 1899.
- - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
- 2 no signature, 4 required" messages about consensus signatures
- easier to read, and make sure they get logged at the same severity
- as the messages explaining which keys are which. Fixes bug 1290.
- - Don't warn when we have a consensus that we can't verify because
- of missing certificates, unless those certificates are ones
- that we have been trying and failing to download. Fixes bug 1145.
- - If you configure your bridge with a known identity fingerprint,
- and the bridge authority is unreachable (as it is in at least
- one country now), fall back to directly requesting the descriptor
- from the bridge. Finishes the feature started in 0.2.0.10-alpha;
- closes bug 1138.
- - When building with --enable-gcc-warnings on OpenBSD, disable
- warnings in system headers. This makes --enable-gcc-warnings
- pass on OpenBSD 4.8.
- o Minor bugfixes (on 0.2.1.x and earlier):
- - Authorities will now attempt to download consensuses if their
- own efforts to make a live consensus have failed. This change
- means authorities that restart will fetch a valid consensus, and
- it means authorities that didn't agree with the current consensus
- will still fetch and serve it if it has enough signatures. Bugfix
- on 0.2.0.9-alpha; fixes bug 1300.
- - Ensure DNS requests launched by "RESOLVE" commands from the
- controller respect the __LeaveStreamsUnattached setconf options. The
- same goes for requests launched via DNSPort or transparent
- proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
- - Allow handshaking OR connections to take a full KeepalivePeriod
- seconds to handshake. Previously, we would close them after
- IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
- were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
- for analysis help.
- - Rate-limit "Failed to hand off onionskin" warnings.
- - Never relay a cell for a circuit we have already destroyed.
- Between marking a circuit as closeable and finally closing it,
- it may have been possible for a few queued cells to get relayed,
- even though they would have been immediately dropped by the next
- OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
- - Never queue a cell for a circuit that's already been marked
- for close.
- - Never vote for a server as "Running" if we have a descriptor for
- it claiming to be hibernating, and that descriptor was published
- more recently than our last contact with the server. Bugfix on
- 0.2.0.3-alpha; fixes bug 911.
- - Squash a compile warning on OpenBSD. Reported by Tas; fixes
- bug 1848.
- o Minor bugfixes (on 0.2.2.x):
- - Fix a regression introduced in 0.2.2.7-alpha that marked relays
- down if a directory fetch fails and you've configured either
- bridges or EntryNodes. The intent was to mark the relay as down
- _unless_ you're using bridges or EntryNodes, since if you are
- then you could quickly run out of entry points.
- - Fix the Windows directory-listing code. A bug introduced in
- 0.2.2.14-alpha could make Windows directory servers forget to load
- some of their cached v2 networkstatus files.
- - Really allow clients to use relays as bridges. Fixes bug 1776;
- bugfix on 0.2.2.15-alpha.
- - Demote a warn to info that happens when the CellStatistics option
- was just enabled. Bugfix on 0.2.2.15-alpha; fixes bug 1921.
- Reported by Moritz Bartl.
- - On Windows, build correctly either with or without Unicode support.
- This is necessary so that Tor can support fringe platforms like
- Windows 98 (which has no Unicode), or Windows CE (which has no
- non-Unicode). Bugfix on 0.2.2.14-alpha; fixes bug 1797.
- o Testing
- - Add a unit test for cross-platform directory-listing code.
- Changes in version 0.2.2.15-alpha - 2010-08-18
- Tor 0.2.2.15-alpha fixes a big bug in hidden service availability,
- fixes a variety of other bugs that were preventing performance
- experiments from moving forward, fixes several bothersome memory leaks,
- and generally closes a lot of smaller bugs that have been filling up
- trac lately.
- o Major bugfixes:
- - Stop assigning the HSDir flag to relays that disable their
- DirPort (and thus will refuse to answer directory requests). This
- fix should dramatically improve the reachability of hidden services:
- hidden services and hidden service clients pick six HSDir relays
- to store and retrieve the hidden service descriptor, and currently
- about half of the HSDir relays will refuse to work. Bugfix on
- 0.2.0.10-alpha; fixes part of bug 1693.
- - The PerConnBWRate and Burst config options, along with the
- bwconnrate and bwconnburst consensus params, initialized each conn's
- token bucket values only when the connection is established. Now we
- update them if the config options change, and update them every time
- we get a new consensus. Otherwise we can encounter an ugly edge
- case where we initialize an OR conn to client-level bandwidth,
- but then later the relay joins the consensus and we leave it
- throttled. Bugfix on 0.2.2.7-alpha; fixes bug 1830.
- - Fix a regression that caused Tor to rebind its ports if it receives
- SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
- o Major features:
- - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
- should give us approximately 40-50% more Guard-flagged nodes,
- improving the anonymity the Tor network can provide and also
- decreasing the dropoff in throughput that relays experience when
- they first get the Guard flag.
- - Allow enabling or disabling the *Statistics config options while
- Tor is running.
- o Minor features:
- - Update to the August 1 2010 Maxmind GeoLite Country database.
- - Have the controller interface give a more useful message than
- "Internal Error" in response to failed GETINFO requests.
- - Warn when the same option is provided more than once in a torrc
- file, on the command line, or in a single SETCONF statement, and
- the option is one that only accepts a single line. Closes bug 1384.
- - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
- Patch from mingw-san.
- - Add support for the country code "{??}" in torrc options like
- ExcludeNodes, to indicate all routers of unknown country. Closes
- bug 1094.
- - Relays report the number of bytes spent on answering directory
- requests in extra-info descriptors similar to {read,write}-history.
- Implements enhancement 1790.
- o Minor bugfixes (on 0.2.1.x and earlier):
- - Complain if PublishServerDescriptor is given multiple arguments that
- include 0 or 1. This configuration will be rejected in the future.
- Bugfix on 0.2.0.1-alpha; closes bug 1107.
- - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
- Bugfix on 0.2.0.13-alpha; closes bug 928.
- - Change "Application request when we're believed to be offline."
- notice to "Application request when we haven't used client
- functionality lately.", to clarify that it's not an error. Bugfix
- on 0.0.9.3; fixes bug 1222.
- - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
- would return "551 Internal error" rather than "552 Unrecognized key
- ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
- - Users can't configure a regular relay to be their bridge. It didn't
- work because when Tor fetched the bridge descriptor, it found
- that it already had it, and didn't realize that the purpose of the
- descriptor had changed. Now we replace routers with a purpose other
- than bridge with bridge descriptors when fetching them. Bugfix on
- 0.1.1.9-alpha. Bug 1776 not yet fixed because now we immediately
- refetch the descriptor with router purpose 'general', disabling
- it as a bridge.
- - Fix a rare bug in rend_fn unit tests: we would fail a test when
- a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
- on 0.2.0.10-alpha; fixes bug 1808.
- - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
- and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
- stream ending reason for this case: END_STREAM_REASON_NOROUTE.
- Servers can start sending this code when enough clients recognize
- it. Also update the spec to reflect this new reason. Bugfix on
- 0.1.0.1-rc; fixes part of bug 1793.
- - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
- when we switch from being a public relay to a bridge. Otherwise
- there will still be clients that see the relay in their consensus,
- and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes bug
- 932 even more.
- - Instead of giving an assertion failure on an internal mismatch
- on estimated freelist size, just log a BUG warning and try later.
- Mitigates but does not fix bug 1125.
- - Fix an assertion failure that could occur in caches or bridge users
- when using a very short voting interval on a testing network.
- Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on 0.2.0.8-alpha.
- o Minor bugfixes (on 0.2.2.x):
- - Alter directory authorities to always consider Exit-flagged nodes
- as potential Guard nodes in their votes. The actual decision to
- use Exits as Guards is done in the consensus bandwidth weights.
- Fixes bug 1294; bugfix on 0.2.2.10-alpha.
- - When the controller is reporting the purpose of circuits that
- didn't finish building before the circuit build timeout, it was
- printing UNKNOWN_13. Now print EXPIRED. Bugfix on 0.2.2.14-alpha.
- - Our libevent version parsing code couldn't handle versions like
- 1.4.14b-stable and incorrectly warned the user about using an
- old and broken version of libevent. Treat 1.4.14b-stable like
- 1.4.14-stable when parsing the version. Fixes bug 1731; bugfix
- on 0.2.2.1-alpha.
- - Don't use substitution references like $(VAR:MOD) when
- $(asciidoc_files) is empty -- make(1) on NetBSD transforms
- '$(:x)' to 'x' rather than the empty string. This bites us in
- doc/ when configured with --disable-asciidoc. Bugfix on
- 0.2.2.9-alpha; fixes bug 1773.
- - Remove a spurious hidden service server-side log notice about
- "Ancient non-dirty circuits". Bugfix on 0.2.2.14-alpha; fixes
- bug 1741.
- - Fix compilation with --with-dmalloc set. Bugfix on 0.2.2.6-alpha;
- fixes bug 1832.
- - Correctly report written bytes on linked connections. Found while
- implementing 1790. Bugfix on 0.2.2.4-alpha.
- - Fix three memory leaks: one in circuit_build_times_parse_state(),
- one in dirvote_add_signatures_to_pending_consensus(), and one every
- time we parse a v3 network consensus. Bugfixes on 0.2.2.14-alpha,
- 0.2.2.6-alpha, and 0.2.2.10-alpha respectively; fixes bug 1831.
- o Code simplifications and refactoring:
- - Take a first step towards making or.h smaller by splitting out
- function definitions for all source files in src/or/. Leave
- structures and defines in or.h for now.
- - Remove a bunch of unused function declarations as well as a block of
- #if 0'd code from the unit tests. Closes bug 1824.
- - New unit tests for exit-port history statistics; refactored exit
- statistics code to be more easily tested.
- - Remove the old debian/ directory from the main Tor distribution.
- The official Tor-for-debian git repository lives at the URL
- https://git.torproject.org/debian/tor.git
- Changes in version 0.2.2.14-alpha - 2010-07-12
- Tor 0.2.2.14-alpha greatly improves client-side handling of
- circuit build timeouts, which are used to estimate speed and improve
- performance. We also move to a much better GeoIP database, port Tor to
- Windows CE, introduce new compile flags that improve code security,
- add an eighth v3 directory authority, and address a lot of more
- minor issues.
- o Major bugfixes:
- - Tor directory authorities no longer crash when started with a
- cached-microdesc-consensus file in their data directory. Bugfix
- on 0.2.2.6-alpha; fixes bug 1532.
- - Treat an unset $HOME like an empty $HOME rather than triggering an
- assert. Bugfix on 0.0.8pre1; fixes bug 1522.
- - Ignore negative and large circuit build timeout values that can
- happen during a suspend or hibernate. These values caused various
- asserts to fire. Bugfix on 0.2.2.2-alpha; fixes bug 1245.
- - Alter calculation of Pareto distribution parameter 'Xm' for
- Circuit Build Timeout learning to use the weighted average of the
- top N=3 modes (because we have three entry guards). Considering
- multiple modes should improve the timeout calculation in some cases,
- and prevent extremely high timeout values. Bugfix on 0.2.2.2-alpha;
- fixes bug 1335.
- - Alter calculation of Pareto distribution parameter 'Alpha' to use a
- right censored distribution model. This approach improves over the
- synthetic timeout generation approach that was producing insanely
- high timeout values. Now we calculate build timeouts using truncated
- times. Bugfix on 0.2.2.2-alpha; fixes bugs 1245 and 1335.
- - Do not close circuits that are under construction when they reach
- the circuit build timeout. Instead, leave them building (but do not
- use them) for up until the time corresponding to the 95th percentile
- on the Pareto CDF or 60 seconds, whichever is greater. This is done
- to provide better data for the new Pareto model. This percentile
- can be controlled by the consensus.
- o Major features:
- - Move to the June 2010 Maxmind GeoLite country db (rather than the
- June 2009 ip-to-country GeoIP db) for our statistics that count
- how many users relays are seeing from each country. Now we have
- more accurate data for many African countries.
- - Port Tor to build and run correctly on Windows CE systems, using
- the wcecompat library. Contributed by Valerio Lupi.
- - New "--enable-gcc-hardening" ./configure flag (off by default)
- to turn on gcc compile time hardening options. It ensures
- that signed ints have defined behavior (-fwrapv), enables
- -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
- with canaries (-fstack-protector-all), turns on ASLR protection if
- supported by the kernel (-fPIE, -pie), and adds additional security
- related warnings. Verified to work on Mac OS X and Debian Lenny.
- - New "--enable-linker-hardening" ./configure flag (off by default)
- to turn on ELF specific hardening features (relro, now). This does
- not work with Mac OS X or any other non-ELF binary format.
- o New directory authorities:
- - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
- authority.
- o Minor features:
- - New config option "WarnUnsafeSocks 0" disables the warning that
- occurs whenever Tor receives a socks handshake using a version of
- the socks protocol that can only provide an IP address (rather
- than a hostname). Setups that do DNS locally over Tor are fine,
- and we shouldn't spam the logs in that case.
- - Convert the HACKING file to asciidoc, and add a few new sections
- to it, explaining how we use Git, how we make changelogs, and
- what should go in a patch.
- - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
- event, to give information on the current rate of circuit timeouts
- over our stored history.
- - Add ability to disable circuit build time learning via consensus
- parameter and via a LearnCircuitBuildTimeout config option. Also
- automatically disable circuit build time calculation if we are
- either a AuthoritativeDirectory, or if we fail to write our state
- file. Fixes bug 1296.
- - More gracefully handle corrupt state files, removing asserts
- in favor of saving a backup and resetting state.
- - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
- system headers.
- o Minor bugfixes:
- - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
- enabled.
- - When a2x fails, mention that the user could disable manpages instead
- of trying to fix their asciidoc installation.
- - Where available, use Libevent 2.0's periodic timers so that our
- once-per-second cleanup code gets called even more closely to
- once per second than it would otherwise. Fixes bug 943.
- - If you run a bridge that listens on multiple IP addresses, and
- some user configures a bridge address that uses a different IP
- address than your bridge writes in its router descriptor, and the
- user doesn't specify an identity key, their Tor would discard the
- descriptor because "it isn't one of our configured bridges", and
- fail to bootstrap. Now believe the descriptor and bootstrap anyway.
- Bugfix on 0.2.0.3-alpha.
- - If OpenSSL fails to make a duplicate of a private or public key, log
- an error message and try to exit cleanly. May help with debugging
- if bug 1209 ever remanifests.
- - Save a couple bytes in memory allocation every time we escape
- certain characters in a string. Patch from Florian Zumbiehl.
- - Make it explicit that we don't cannibalize one-hop circuits. This
- happens in the wild, but doesn't turn out to be a problem because
- we fortunately don't use those circuits. Many thanks to outofwords
- for the initial analysis and to swissknife who confirmed that
- two-hop circuits are actually created.
- - Make directory mirrors report non-zero dirreq-v[23]-shares again.
- Fixes bug 1564; bugfix on 0.2.2.9-alpha.
- - Eliminate a case where a circuit build time warning was displayed
- after network connectivity resumed. Bugfix on 0.2.2.2-alpha.
- Changes in version 0.2.1.26 - 2010-05-02
- Tor 0.2.1.26 addresses the recent connection and memory overload
- problems we've been seeing on relays, especially relays with their
- DirPort open. If your relay has been crashing, or you turned it off
- because it used too many resources, give this release a try.
- This release also fixes yet another instance of broken OpenSSL libraries
- that was causing some relays to drop out of the consensus.
- o Major bugfixes:
- - Teach relays to defend themselves from connection overload. Relays
- now close idle circuits early if it looks like they were intended
- for directory fetches. Relays are also more aggressive about closing
- TLS connections that have no circuits on them. Such circuits are
- unlikely to be re-used, and tens of thousands of them were piling
- up at the fast relays, causing the relays to run out of sockets
- and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
- their directory fetches over TLS).
- - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
- that claim to be earlier than 0.9.8m, but which have in reality
- backported huge swaths of 0.9.8m or 0.9.8n renegotiation
- behavior. Possible fix for some cases of bug 1346.
- - Directory mirrors were fetching relay descriptors only from v2
- directory authorities, rather than v3 authorities like they should.
- Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
- to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
- o Minor bugfixes:
- - Finally get rid of the deprecated and now harmful notion of "clique
- mode", where directory authorities maintain TLS connections to
- every other relay.
- o Testsuite fixes:
- - In the util/threads test, no longer free the test_mutex before all
- worker threads have finished. Bugfix on 0.2.1.6-alpha.
- - The master thread could starve the worker threads quite badly on
- certain systems, causing them to run only partially in the allowed
- window. This resulted in test failures. Now the master thread sleeps
- occasionally for a few microseconds while the two worker-threads
- compete for the mutex. Bugfix on 0.2.0.1-alpha.
- Changes in version 0.2.2.13-alpha - 2010-04-24
- Tor 0.2.2.13-alpha addresses the recent connection and memory overload
- problems we've been seeing on relays, especially relays with their
- DirPort open. If your relay has been crashing, or you turned it off
- because it used too many resources, give this release a try.
- o Major bugfixes:
- - Teach relays to defend themselves from connection overload. Relays
- now close idle circuits early if it looks like they were intended
- for directory fetches. Relays are also more aggressive about closing
- TLS connections that have no circuits on them. Such circuits are
- unlikely to be re-used, and tens of thousands of them were piling
- up at the fast relays, causing the relays to run out of sockets
- and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
- their directory fetches over TLS).
- o Minor features:
- - Finally get rid of the deprecated and now harmful notion of "clique
- mode", where directory authorities maintain TLS connections to
- every other relay.
- - Directory authorities now do an immediate reachability check as soon
- as they hear about a new relay. This change should slightly reduce
- the time between setting up a relay and getting listed as running
- in the consensus. It should also improve the time between setting
- up a bridge and seeing use by bridge users.
- - Directory authorities no longer launch a TLS connection to every
- relay as they startup. Now that we have 2k+ descriptors cached,
- the resulting network hiccup is becoming a burden. Besides,
- authorities already avoid voting about Running for the first half
- hour of their uptime.
- Changes in version 0.2.2.12-alpha - 2010-04-20
- Tor 0.2.2.12-alpha fixes a critical bug in how directory authorities
- handle and vote on descriptors. It was causing relays to drop out of
- the consensus.
- o Major bugfixes:
- - Many relays have been falling out of the consensus lately because
- not enough authorities know about their descriptor for them to get
- a majority of votes. When we deprecated the v2 directory protocol,
- we got rid of the only way that v3 authorities can hear from each
- other about other descriptors. Now authorities examine every v3
- vote for new descriptors, and fetch them from that authority. Bugfix
- on 0.2.1.23.
- - Fix two typos in tor_vasprintf() that broke the compile on Windows,
- and a warning in or.h related to bandwidth_weight_rule_t that
- prevented clean compile on OS X. Fixes bug 1363; bugfix on
- 0.2.2.11-alpha.
- - Fix a segfault on relays when DirReqStatistics is enabled
- and 24 hours pass. Bug found by keb. Fixes bug 1365; bugfix on
- 0.2.2.11-alpha.
- o Minor bugfixes:
- - Demote a confusing TLS warning that relay operators might get when
- someone tries to talk to their OrPort. It is neither the operator's
- fault nor can they do anything about it. Fixes bug 1364; bugfix
- on 0.2.0.14-alpha.
- Changes in version 0.2.2.11-alpha - 2010-04-15
- Tor 0.2.2.11-alpha fixes yet another instance of broken OpenSSL
- libraries that was causing some relays to drop out of the consensus.
- o Major bugfixes:
- - Directory mirrors were fetching relay descriptors only from v2
- directory authorities, rather than v3 authorities like they should.
- Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
- to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
- - Fix a parsing error that made every possible value of
- CircPriorityHalflifeMsec get treated as "1 msec". Bugfix
- on 0.2.2.7-alpha. Rename CircPriorityHalflifeMsec to
- CircuitPriorityHalflifeMsec, so authorities can tell newer relays
- about the option without breaking older ones.
- - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
- that claim to be earlier than 0.9.8m, but which have in reality
- backported huge swaths of 0.9.8m or 0.9.8n renegotiation
- behavior. Possible fix for some cases of bug 1346.
- o Minor features:
- - Experiment with a more aggressive approach to preventing clients
- from making one-hop exit streams. Exit relays who want to try it
- out can set "RefuseUnknownExits 1" in their torrc, and then look
- for "Attempt by %s to open a stream" log messages. Let us know
- how it goes!
- - Add support for statically linking zlib by specifying
- --enable-static-zlib, to go with our support for statically linking
- openssl and libevent. Resolves bug 1358.
- o Minor bugfixes:
- - Fix a segfault that happens whenever a Tor client that is using
- libevent2's bufferevents gets a hup signal. Bugfix on 0.2.2.5-alpha;
- fixes bug 1341.
- - When we cleaned up the contrib/tor-exit-notice.html file, we left
- out the first line. Fixes bug 1295.
- - When building the manpage from a tarball, we required asciidoc, but
- the asciidoc -> roff/html conversion was already done for the
- tarball. Make 'make' complain only when we need asciidoc (either
- because we're compiling directly from git, or because we altered
- the asciidoc manpage in the tarball). Bugfix on 0.2.2.9-alpha.
- - When none of the directory authorities vote on any params, Tor
- segfaulted when trying to make the consensus from the votes. We
- didn't trigger the bug in practice, because authorities do include
- params in their votes. Bugfix on 0.2.2.10-alpha; fixes bug 1322.
- o Testsuite fixes:
- - In the util/threads test, no longer free the test_mutex before all
- worker threads have finished. Bugfix on 0.2.1.6-alpha.
- - The master thread could starve the worker threads quite badly on
- certain systems, causing them to run only partially in the allowed
- window. This resulted in test failures. Now the master thread sleeps
- occasionally for a few microseconds while the two worker-threads
- compete for the mutex. Bugfix on 0.2.0.1-alpha.
- Changes in version 0.2.2.10-alpha - 2010-03-07
- Tor 0.2.2.10-alpha fixes a regression introduced in 0.2.2.9-alpha that
- could prevent relays from guessing their IP address correctly. It also
- starts the groundwork for another client-side performance boost, since
- currently we're not making efficient use of relays that have both the
- Guard flag and the Exit flag.
- o Major bugfixes:
- - Fix a regression from our patch for bug 1244 that caused relays
- to guess their IP address incorrectly if they didn't set Address
- in their torrc and/or their address fails to resolve. Bugfix on
- 0.2.2.9-alpha; fixes bug 1269.
- o Major features (performance):
- - Directory authorities now compute consensus weightings that instruct
- clients how to weight relays flagged as Guard, Exit, Guard+Exit,
- and no flag. Clients that use these weightings will distribute
- network load more evenly across these different relay types. The
- weightings are in the consensus so we can change them globally in
- the future. Extra thanks to "outofwords" for finding some nasty
- security bugs in the first implementation of this feature.
- o Minor features (performance):
- - Always perform router selections using weighted relay bandwidth,
- even if we don't need a high capacity circuit at the time. Non-fast
- circuits now only differ from fast ones in that they can use relays
- not marked with the Fast flag. This "feature" could turn out to
- be a horrible bug; we should investigate more before it goes into
- a stable release.
- o Minor features:
- - Allow disabling building of the manpages. Skipping the manpage
- speeds up the build considerably.
- o Minor bugfixes (on 0.2.2.x):
- - Fix a memleak in the EXTENDCIRCUIT logic. Spotted by coverity.
- Bugfix on 0.2.2.9-alpha.
- - Disallow values larger than INT32_MAX for PerConnBWRate|Burst
- config option. Bugfix on 0.2.2.7-alpha.
- - Ship the asciidoc-helper file in the tarball, so that people can
- build from source if they want to, and touching the .1.txt files
- doesn't break the build. Bugfix on 0.2.2.9-alpha.
- o Minor bugfixes (on 0.2.1.x or earlier):
- - Fix a dereference-then-NULL-check sequence when publishing
- descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
- bug 1255.
- - Fix another dereference-then-NULL-check sequence. Bugfix on
- 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
- - Make sure we treat potentially not NUL-terminated strings correctly.
- Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
- o Code simplifications and refactoring:
- - Fix some urls in the exit notice file and make it XHTML1.1 strict
- compliant. Based on a patch from Christian Kujau.
- - Don't use sed in asciidoc-helper anymore.
- - Make the build process fail if asciidoc cannot be found and
- building with asciidoc isn't disabled.
- Changes in version 0.2.2.9-alpha - 2010-02-22
- Tor 0.2.2.9-alpha makes Tor work again on the latest OS X, updates the
- location of a directory authority, and cleans up a bunch of small bugs.
- o Directory authority changes:
- - Change IP address for dannenberg (v3 directory authority), and
- remove moria2 (obsolete v1, v2 directory authority and v0 hidden
- service directory authority) from the list.
- o Major bugfixes:
- - Make Tor work again on the latest OS X: when deciding whether to
- use strange flags to turn TLS renegotiation on, detect the OpenSSL
- version at run-time, not compile time. We need to do this because
- Apple doesn't update its dev-tools headers when it updates its
- libraries in a security patch.
- - Fix a potential buffer overflow in lookup_last_hid_serv_request()
- that could happen on 32-bit platforms with 64-bit time_t. Also fix
- a memory leak when requesting a hidden service descriptor we've
- requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
- by aakova.
- - Authorities could be tricked into giving out the Exit flag to relays
- that didn't allow exiting to any ports. This bug could screw
- with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
- 1238. Bug discovered by Martin Kowalczyk.
- - When freeing a session key, zero it out completely. We only zeroed
- the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
- patched by ekir. Fixes bug 1254.
- o Minor bugfixes:
- - Fix static compilation by listing the openssl libraries in the right
- order. Bugfix on Tor 0.2.2.8-alpha; fixes bug 1237.
- - Resume handling .exit hostnames in a special way: originally we
- stripped the .exit part and used the requested exit relay. In
- 0.2.2.1-alpha we stopped treating them in any special way, meaning
- if you use a .exit address then Tor will pass it on to the exit
- relay. Now we reject the .exit stream outright, since that behavior
- might be more expected by the user. Found and diagnosed by Scott
- Bennett and Downie on or-talk.
- - Don't spam the controller with events when we have no file
- descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
- for log messages was already solved from bug 748.)
- - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
- "memcpyfail".
- - Make the DNSPort option work with libevent 2.x. Don't alter the
- behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
- - Emit a GUARD DROPPED controller event for a case we missed.
- - Make more fields in the controller protocol case-insensitive, since
- control-spec.txt said they were.
- - Refactor resolve_my_address() to not use gethostbyname() anymore.
- Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
- - Fix a spec conformance issue: the network-status-version token
- must be the first token in a v3 consensus or vote. Discovered by
- parakeep. Bugfix on 0.2.0.3-alpha.
- o Code simplifications and refactoring:
- - Generate our manpage and HTML documentation using Asciidoc. This
- change should make it easier to maintain the documentation, and
- produce nicer HTML.
- - Remove the --enable-iphone option. According to reports from Marco
- Bonetti, Tor builds fine without any special tweaking on recent
- iPhone SDK versions.
- - Removed some unnecessary files from the source distribution. The
- AUTHORS file has now been merged into the people page on the
- website. The roadmaps and design doc can now be found in the
- projects directory in svn.
- - Enabled various circuit build timeout constants to be controlled
- by consensus parameters. Also set better defaults for these
- parameters based on experimentation on broadband and simulated
- high latency links.
- o Minor features:
- - The 'EXTENDCIRCUIT' control port command can now be used with
- a circ id of 0 and no path. This feature will cause Tor to build
- a new 'fast' general purpose circuit using its own path selection
- algorithms.
- - Added a BUILDTIMEOUT_SET controller event to describe changes
- to the circuit build timeout.
- - Future-proof the controller protocol a bit by ignoring keyword
- arguments we do not recognize.
- - Expand homedirs passed to tor-checkkey. This should silence a
- coverity complaint about passing a user-supplied string into
- open() without checking it.
- Changes in version 0.2.1.25 - 2010-03-16
- Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
- prevent relays from guessing their IP address correctly. It also fixes
- several minor potential security bugs.
- o Major bugfixes:
- - Fix a regression from our patch for bug 1244 that caused relays
- to guess their IP address incorrectly if they didn't set Address
- in their torrc and/or their address fails to resolve. Bugfix on
- 0.2.1.23; fixes bug 1269.
- - When freeing a session key, zero it out completely. We only zeroed
- the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
- patched by ekir. Fixes bug 1254.
- o Minor bugfixes:
- - Fix a dereference-then-NULL-check sequence when publishing
- descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
- bug 1255.
- - Fix another dereference-then-NULL-check sequence. Bugfix on
- 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
- - Make sure we treat potentially not NUL-terminated strings correctly.
- Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
- Changes in version 0.2.1.24 - 2010-02-21
- Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
- for sure!
- o Minor bugfixes:
- - Work correctly out-of-the-box with even more vendor-patched versions
- of OpenSSL. In particular, make it so Debian and OS X don't need
- customized patches to run/build.
- Changes in version 0.2.1.23 - 2010-02-13
- Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
- again on the latest OS X, and updates the location of a directory
- authority.
- o Major bugfixes (performance):
- - We were selecting our guards uniformly at random, and then weighting
- which of our guards we'd use uniformly at random. This imbalance
- meant that Tor clients were severely limited on throughput (and
- probably latency too) by the first hop in their circuit. Now we
- select guards weighted by currently advertised bandwidth. We also
- automatically discard guards picked using the old algorithm. Fixes
- bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
- o Major bugfixes:
- - Make Tor work again on the latest OS X: when deciding whether to
- use strange flags to turn TLS renegotiation on, detect the OpenSSL
- version at run-time, not compile time. We need to do this because
- Apple doesn't update its dev-tools headers when it updates its
- libraries in a security patch.
- - Fix a potential buffer overflow in lookup_last_hid_serv_request()
- that could happen on 32-bit platforms with 64-bit time_t. Also fix
- a memory leak when requesting a hidden service descriptor we've
- requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
- by aakova.
- o Directory authority changes:
- - Change IP address for dannenberg (v3 directory authority), and
- remove moria2 (obsolete v1, v2 directory authority and v0 hidden
- service directory authority) from the list.
- o Minor bugfixes:
- - Refactor resolve_my_address() to not use gethostbyname() anymore.
- Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
- o Minor features:
- - Avoid a mad rush at the beginning of each month when each client
- rotates half of its guards. Instead we spread the rotation out
- throughout the month, but we still avoid leaving a precise timestamp
- in the state file about when we first picked the guard. Improves
- over the behavior introduced in 0.1.2.17.
- Changes in version 0.2.2.8-alpha - 2010-01-26
- Tor 0.2.2.8-alpha fixes a crash bug in 0.2.2.7-alpha that has been
- causing bridge relays to disappear. If you're running a bridge,
- please upgrade.
- o Major bugfixes:
- - Fix a memory corruption bug on bridges that occurred during the
- inclusion of stats data in extra-info descriptors. Also fix the
- interface for geoip_get_bridge_stats* to prevent similar bugs in
- the future. Diagnosis by Tas, patch by Karsten and Sebastian.
- Fixes bug 1208; bugfix on 0.2.2.7-alpha.
- o Minor bugfixes:
- - Ignore OutboundBindAddress when connecting to localhost.
- Connections to localhost need to come _from_ localhost, or else
- local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
- refuse to listen.
- Changes in version 0.2.2.7-alpha - 2010-01-19
- Tor 0.2.2.7-alpha fixes a huge client-side performance bug, as well
- as laying the groundwork for further relay-side performance fixes. It
- also starts cleaning up client behavior with respect to the EntryNodes,
- ExitNodes, and StrictNodes config options.
- This release also rotates two directory authority keys, due to a
- security breach of some of the Torproject servers.
- o Directory authority changes:
- - Rotate keys (both v3 identity and relay identity) for moria1
- and gabelmoo.
- o Major features (performance):
- - We were selecting our guards uniformly at random, and then weighting
- which of our guards we'd use uniformly at random. This imbalance
- meant that Tor clients were severely limited on throughput (and
- probably latency too) by the first hop in their circuit. Now we
- select guards weighted by currently advertised bandwidth. We also
- automatically discard guards picked using the old algorithm. Fixes
- bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
- - When choosing which cells to relay first, relays can now favor
- circuits that have been quiet recently, to provide lower latency
- for low-volume circuits. By default, relays enable or disable this
- feature based on a setting in the consensus. You can override
- this default by using the new "CircuitPriorityHalflife" config
- option. Design and code by Ian Goldberg, Can Tang, and Chris
- Alexander.
- - Add separate per-conn write limiting to go with the per-conn read
- limiting. We added a global write limit in Tor 0.1.2.5-alpha,
- but never per-conn write limits.
- - New consensus params "bwconnrate" and "bwconnburst" to let us
- rate-limit client connections as they enter the network. It's
- controlled in the consensus so we can turn it on and off for
- experiments. It's starting out off. Based on proposal 163.
- o Major features (relay selection options):
- - Switch to a StrictNodes config option, rather than the previous
- "StrictEntryNodes" / "StrictExitNodes" separation that was missing a
- "StrictExcludeNodes" option.
- - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
- change during a config reload, mark and discard all our origin
- circuits. This fix should address edge cases where we change the
- config options and but then choose a circuit that we created before
- the change.
- - If EntryNodes or ExitNodes are set, be more willing to use an
- unsuitable (e.g. slow or unstable) circuit. The user asked for it,
- they get it.
- - Make EntryNodes config option much more aggressive even when
- StrictNodes is not set. Before it would prepend your requested
- entrynodes to your list of guard nodes, but feel free to use others
- after that. Now it chooses only from your EntryNodes if any of
- those are available, and only falls back to others if a) they're
- all down and b) StrictNodes is not set.
- - Now we refresh your entry guards from EntryNodes at each consensus
- fetch -- rather than just at startup and then they slowly rot as
- the network changes.
- o Major bugfixes:
- - Stop bridge directory authorities from answering dbg-stability.txt
- directory queries, which would let people fetch a list of all
- bridge identities they track. Bugfix on 0.2.1.6-alpha.
- o Minor features:
- - Log a notice when we get a new control connection. Now it's easier
- for security-conscious users to recognize when a local application
- is knocking on their controller door. Suggested by bug 1196.
- - New config option "CircuitStreamTimeout" to override our internal
- timeout schedule for how many seconds until we detach a stream from
- a circuit and try a new circuit. If your network is particularly
- slow, you might want to set this to a number like 60.
- - New controller command "getinfo config-text". It returns the
- contents that Tor would write if you send it a SAVECONF command,
- so the controller can write the file to disk itself.
- - New options for SafeLogging to allow scrubbing only log messages
- generated while acting as a relay.
- - Ship the bridges spec file in the tarball too.
- - Avoid a mad rush at the beginning of each month when each client
- rotates half of its guards. Instead we spread the rotation out
- throughout the month, but we still avoid leaving a precise timestamp
- in the state file about when we first picked the guard. Improves
- over the behavior introduced in 0.1.2.17.
- o Minor bugfixes (compiling):
- - Fix compilation on OS X 10.3, which has a stub mlockall() but
- hides it. Bugfix on 0.2.2.6-alpha.
- - Fix compilation on Solaris by removing support for the
- DisableAllSwap config option. Solaris doesn't have an rlimit for
- mlockall, so we cannot use it safely. Fixes bug 1198; bugfix on
- 0.2.2.6-alpha.
- o Minor bugfixes (crashes):
- - Do not segfault when writing buffer stats when we haven't observed
- a single circuit to report about. Found by Fabian Lanze. Bugfix on
- 0.2.2.1-alpha.
- - If we're in the pathological case where there's no exit bandwidth
- but there is non-exit bandwidth, or no guard bandwidth but there
- is non-guard bandwidth, don't crash during path selection. Bugfix
- on 0.2.0.3-alpha.
- - Fix an impossible-to-actually-trigger buffer overflow in relay
- descriptor generation. Bugfix on 0.1.0.15.
- o Minor bugfixes (privacy):
- - Fix an instance where a Tor directory mirror might accidentally
- log the IP address of a misbehaving Tor client. Bugfix on
- 0.1.0.1-rc.
- - Don't list Windows capabilities in relay descriptors. We never made
- use of them, and maybe it's a bad idea to publish them. Bugfix
- on 0.1.1.8-alpha.
- o Minor bugfixes (other):
- - Resolve an edge case in path weighting that could make us misweight
- our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
- - Fix statistics on client numbers by country as seen by bridges that
- were broken in 0.2.2.1-alpha. Also switch to reporting full 24-hour
- intervals instead of variable 12-to-48-hour intervals.
- - After we free an internal connection structure, overwrite it
- with a different memory value than we use for overwriting a freed
- internal circuit structure. Should help with debugging. Suggested
- by bug 1055.
- - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
- too.
- o Removed features:
- - Remove the HSAuthorityRecordStats option that version 0 hidden
- service authorities could have used to track statistics of overall
- hidden service usage.
- Changes in version 0.2.1.22 - 2010-01-19
- Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
- authorities -- it would tell you its whole history of bridge descriptors
- if you make the right directory request. This stable update also
- rotates two of the seven v3 directory authority keys and locations.
- o Directory authority changes:
- - Rotate keys (both v3 identity and relay identity) for moria1
- and gabelmoo.
- o Major bugfixes:
- - Stop bridge directory authorities from answering dbg-stability.txt
- directory queries, which would let people fetch a list of all
- bridge identities they track. Bugfix on 0.2.1.6-alpha.
- Changes in version 0.2.1.21 - 2009-12-21
- Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
- library. If you use Tor on Linux / Unix and you're getting SSL
- renegotiation errors, upgrading should help. We also recommend an
- upgrade if you're an exit relay.
- o Major bugfixes:
- - Work around a security feature in OpenSSL 0.9.8l that prevents our
- handshake from working unless we explicitly tell OpenSSL that we
- are using SSL renegotiation safely. We are, of course, but OpenSSL
- 0.9.8l won't work unless we say we are.
- - Avoid crashing if the client is trying to upload many bytes and the
- circuit gets torn down at the same time, or if the flip side
- happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
- o Minor bugfixes:
- - Do not refuse to learn about authority certs and v2 networkstatus
- documents that are older than the latest consensus. This bug might
- have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
- Spotted and fixed by xmux.
- - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
- trigger platform-specific option misparsing case found by Coverity
- Scan.
- - Fix a compilation warning on Fedora 12 by removing an impossible-to-
- trigger assert. Fixes bug 1173.
- Changes in version 0.2.2.6-alpha - 2009-11-19
- Tor 0.2.2.6-alpha lays the groundwork for many upcoming features:
- support for the new lower-footprint "microdescriptor" directory design,
- future-proofing our consensus format against new hash functions or
- other changes, and an Android port. It also makes Tor compatible with
- the upcoming OpenSSL 0.9.8l release, and fixes a variety of bugs.
- o Major features:
- - Directory authorities can now create, vote on, and serve multiple
- parallel formats of directory data as part of their voting process.
- Partially implements Proposal 162: "Publish the consensus in
- multiple flavors".
- - Directory authorities can now agree on and publish small summaries
- of router information that clients can use in place of regular
- server descriptors. This transition will eventually allow clients
- to use far less bandwidth for downloading information about the
- network. Begins the implementation of Proposal 158: "Clients
- download consensus + microdescriptors".
- - The directory voting system is now extensible to use multiple hash
- algorithms for signatures and resource selection. Newer formats
- are signed with SHA256, with a possibility for moving to a better
- hash algorithm in the future.
- - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
- current and future memory pages via mlockall(). On supported
- platforms (modern Linux and probably BSD but not Windows or OS X),
- this should effectively disable any and all attempts to page out
- memory. This option requires that you start your Tor as root --
- if you use DisableAllSwap, please consider using the User option
- to properly reduce the privileges of your Tor.
- - Numerous changes, bugfixes, and workarounds from Nathan Freitas
- to help Tor build correctly for Android phones.
- o Major bugfixes:
- - Work around a security feature in OpenSSL 0.9.8l that prevents our
- handshake from working unless we explicitly tell OpenSSL that we
- are using SSL renegotiation safely. We are, but OpenSSL 0.9.8l
- won't work unless we say we are.
- o Minor bugfixes:
- - Fix a crash bug when trying to initialize the evdns module in
- Libevent 2. Bugfix on 0.2.1.16-rc.
- - Stop logging at severity 'warn' when some other Tor client tries
- to establish a circuit with us using weak DH keys. It's a protocol
- violation, but that doesn't mean ordinary users need to hear about
- it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
- - Do not refuse to learn about authority certs and v2 networkstatus
- documents that are older than the latest consensus. This bug might
- have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
- Spotted and fixed by xmux.
- - Fix numerous small code-flaws found by Coverity Scan Rung 3.
- - If all authorities restart at once right before a consensus vote,
- nobody will vote about "Running", and clients will get a consensus
- with no usable relays. Instead, authorities refuse to build a
- consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
- - If your relay can't keep up with the number of incoming create
- cells, it would log one warning per failure into your logs. Limit
- warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
- - Bridges now use "reject *:*" as their default exit policy. Bugfix
- on 0.2.0.3-alpha; fixes bug 1113.
- - Fix a memory leak on directory authorities during voting that was
- introduced in 0.2.2.1-alpha. Found via valgrind.
- Changes in version 0.2.1.20 - 2009-10-15
- Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
- services at once, prepares for more performance improvements, and
- fixes a bunch of smaller bugs.
- The Windows and OS X bundles also include a more recent Vidalia,
- and switch from Privoxy to Polipo.
- The OS X installers are now drag and drop. It's best to un-install
- Tor/Vidalia and then install this new bundle, rather than upgrade. If
- you want to upgrade, you'll need to update the paths for Tor and Polipo
- in the Vidalia Settings window.
- o Major bugfixes:
- - Send circuit or stream sendme cells when our window has decreased
- by 100 cells, not when it has decreased by 101 cells. Bug uncovered
- by Karsten when testing the "reduce circuit window" performance
- patch. Bugfix on the 54th commit on Tor -- from July 2002,
- before the release of Tor 0.0.0. This is the new winner of the
- oldest-bug prize.
- - Fix a remotely triggerable memory leak when a consensus document
- contains more than one signature from the same voter. Bugfix on
- 0.2.0.3-alpha.
- - Avoid segfault in rare cases when finishing an introduction circuit
- as a client and finding out that we don't have an introduction key
- for it. Fixes bug 1073. Reported by Aaron Swartz.
- o Major features:
- - Tor now reads the "circwindow" parameter out of the consensus,
- and uses that value for its circuit package window rather than the
- default of 1000 cells. Begins the implementation of proposal 168.
- o New directory authorities:
- - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
- authority.
- - Move moria1 and tonga to alternate IP addresses.
- o Minor bugfixes:
- - Fix a signed/unsigned compile warning in 0.2.1.19.
- - Fix possible segmentation fault on directory authorities. Bugfix on
- 0.2.1.14-rc.
- - Fix an extremely rare infinite recursion bug that could occur if
- we tried to log a message after shutting down the log subsystem.
- Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
- - Fix an obscure bug where hidden services on 64-bit big-endian
- systems might mis-read the timestamp in v3 introduce cells, and
- refuse to connect back to the client. Discovered by "rotor".
- Bugfix on 0.2.1.6-alpha.
- - We were triggering a CLOCK_SKEW controller status event whenever
- we connect via the v2 connection protocol to any relay that has
- a wrong clock. Instead, we should only inform the controller when
- it's a trusted authority that claims our clock is wrong. Bugfix
- on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
- - We were telling the controller about CHECKING_REACHABILITY and
- REACHABILITY_FAILED status events whenever we launch a testing
- circuit or notice that one has failed. Instead, only tell the
- controller when we want to inform the user of overall success or
- overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
- by SwissTorExit.
- - Don't warn when we're using a circuit that ends with a node
- excluded in ExcludeExitNodes, but the circuit is not used to access
- the outside world. This should help fix bug 1090. Bugfix on
- 0.2.1.6-alpha.
- - Work around a small memory leak in some versions of OpenSSL that
- stopped the memory used by the hostname TLS extension from being
- freed.
- o Minor features:
- - Add a "getinfo status/accepted-server-descriptor" controller
- command, which is the recommended way for controllers to learn
- whether our server descriptor has been successfully received by at
- least on directory authority. Un-recommend good-server-descriptor
- getinfo and status events until we have a better design for them.
- Changes in version 0.2.2.5-alpha - 2009-10-11
- Tor 0.2.2.5-alpha fixes a few compile problems in 0.2.2.4-alpha.
- o Major bugfixes:
- - Make the tarball compile again. Oops. Bugfix on 0.2.2.4-alpha.
- o Directory authorities:
- - Temporarily (just for this release) move dizum to an alternate
- IP address.
- Changes in version 0.2.2.4-alpha - 2009-10-10
- Tor 0.2.2.4-alpha fixes more crash bugs in 0.2.2.2-alpha. It also
- introduces a new unit test framework, shifts directry authority
- addresses around to reduce the impact from recent blocking events,
- and fixes a few smaller bugs.
- o Major bugfixes:
- - Fix several more asserts in the circuit_build_times code, for
- example one that causes Tor to fail to start once we have
- accumulated 5000 build times in the state file. Bugfixes on
- 0.2.2.2-alpha; fixes bug 1108.
- o New directory authorities:
- - Move moria1 and Tonga to alternate IP addresses.
- o Minor features:
- - Log SSL state transitions at debug level during handshake, and
- include SSL states in error messages. This may help debug future
- SSL handshake issues.
- - Add a new "Handshake" log domain for activities that happen
- during the TLS handshake.
- - Revert to the "June 3 2009" ip-to-country file. The September one
- seems to have removed most US IP addresses.
- - Directory authorities now reject Tor relays with versions less than
- 0.1.2.14. This step cuts out four relays from the current network,
- none of which are very big.
- o Minor bugfixes:
- - Fix a couple of smaller issues with gathering statistics. Bugfixes
- on 0.2.2.1-alpha.
- - Fix two memory leaks in the error case of
- circuit_build_times_parse_state(). Bugfix on 0.2.2.2-alpha.
- - Don't count one-hop circuits when we're estimating how long it
- takes circuits to build on average. Otherwise we'll set our circuit
- build timeout lower than we should. Bugfix on 0.2.2.2-alpha.
- - Directory authorities no longer change their opinion of, or vote on,
- whether a router is Running, unless they have themselves been
- online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
- Fixes bug 1023.
- o Code simplifications and refactoring:
- - Revise our unit tests to use the "tinytest" framework, so we
- can run tests in their own processes, have smarter setup/teardown
- code, and so on. The unit test code has moved to its own
- subdirectory, and has been split into multiple modules.
- Changes in version 0.2.2.3-alpha - 2009-09-23
- Tor 0.2.2.3-alpha fixes a few crash bugs in 0.2.2.2-alpha.
- o Major bugfixes:
- - Fix an overzealous assert in our new circuit build timeout code.
- Bugfix on 0.2.2.2-alpha; fixes bug 1103.
- o Minor bugfixes:
- - If the networkstatus consensus tells us that we should use a
- negative circuit package window, ignore it. Otherwise we'll
- believe it and then trigger an assert. Bugfix on 0.2.2.2-alpha.
- Changes in version 0.2.2.2-alpha - 2009-09-21
- Tor 0.2.2.2-alpha introduces our latest performance improvement for
- clients: Tor tracks the average time it takes to build a circuit, and
- avoids using circuits that take too long to build. For fast connections,
- this feature can cut your expected latency in half. For slow or flaky
- connections, it could ruin your Tor experience. Let us know if it does!
- o Major features:
- - Tor now tracks how long it takes to build client-side circuits
- over time, and adapts its timeout to local network performance.
- Since a circuit that takes a long time to build will also provide
- bad performance, we get significant latency improvements by
- discarding the slowest 20% of circuits. Specifically, Tor creates
- circuits more aggressively than usual until it has enough data
- points for a good timeout estimate. Implements proposal 151.
- We are especially looking for reports (good and bad) from users with
- both EDGE and broadband connections that can move from broadband
- to EDGE and find out if the build-time data in the .tor/state gets
- reset without loss of Tor usability. You should also see a notice
- log message telling you that Tor has reset its timeout.
- - Directory authorities can now vote on arbitrary integer values as
- part of the consensus process. This is designed to help set
- network-wide parameters. Implements proposal 167.
- - Tor now reads the "circwindow" parameter out of the consensus,
- and uses that value for its circuit package window rather than the
- default of 1000 cells. Begins the implementation of proposal 168.
- o Major bugfixes:
- - Fix a remotely triggerable memory leak when a consensus document
- contains more than one signature from the same voter. Bugfix on
- 0.2.0.3-alpha.
- o Minor bugfixes:
- - Fix an extremely rare infinite recursion bug that could occur if
- we tried to log a message after shutting down the log subsystem.
- Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
- - Fix parsing for memory or time units given without a space between
- the number and the unit. Bugfix on 0.2.2.1-alpha; fixes bug 1076.
- - A networkstatus vote must contain exactly one signature. Spec
- conformance issue. Bugfix on 0.2.0.3-alpha.
- - Fix an obscure bug where hidden services on 64-bit big-endian
- systems might mis-read the timestamp in v3 introduce cells, and
- refuse to connect back to the client. Discovered by "rotor".
- Bugfix on 0.2.1.6-alpha.
- - We were triggering a CLOCK_SKEW controller status event whenever
- we connect via the v2 connection protocol to any relay that has
- a wrong clock. Instead, we should only inform the controller when
- it's a trusted authority that claims our clock is wrong. Bugfix
- on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
- - We were telling the controller about CHECKING_REACHABILITY and
- REACHABILITY_FAILED status events whenever we launch a testing
- circuit or notice that one has failed. Instead, only tell the
- controller when we want to inform the user of overall success or
- overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
- by SwissTorExit.
- - Don't warn when we're using a circuit that ends with a node
- excluded in ExcludeExitNodes, but the circuit is not used to access
- the outside world. This should help fix bug 1090, but more problems
- remain. Bugfix on 0.2.1.6-alpha.
- - Work around a small memory leak in some versions of OpenSSL that
- stopped the memory used by the hostname TLS extension from being
- freed.
- - Make our 'torify' script more portable; if we have only one of
- 'torsocks' or 'tsocks' installed, don't complain to the user;
- and explain our warning about tsocks better.
- o Minor features:
- - Add a "getinfo status/accepted-server-descriptor" controller
- command, which is the recommended way for controllers to learn
- whether our server descriptor has been successfully received by at
- least on directory authority. Un-recommend good-server-descriptor
- getinfo and status events until we have a better design for them.
- - Update to the "September 4 2009" ip-to-country file.
- Changes in version 0.2.2.1-alpha - 2009-08-26
- Tor 0.2.2.1-alpha disables ".exit" address notation by default, allows
- Tor clients to bootstrap on networks where only port 80 is reachable,
- makes it more straightforward to support hardware crypto accelerators,
- and starts the groundwork for gathering stats safely at relays.
- o Security fixes:
- - Start the process of disabling ".exit" address notation, since it
- can be used for a variety of esoteric application-level attacks
- on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
- on 0.0.9rc5.
- o New directory authorities:
- - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
- authority.
- o Major features:
- - New AccelName and AccelDir options add support for dynamic OpenSSL
- hardware crypto acceleration engines.
- - Tor now supports tunneling all of its outgoing connections over
- a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
- configuration options. Code by Christopher Davis.
- o Major bugfixes:
- - Send circuit or stream sendme cells when our window has decreased
- by 100 cells, not when it has decreased by 101 cells. Bug uncovered
- by Karsten when testing the "reduce circuit window" performance
- patch. Bugfix on the 54th commit on Tor -- from July 2002,
- before the release of Tor 0.0.0. This is the new winner of the
- oldest-bug prize.
- o New options for gathering stats safely:
- - Directory mirrors that set "DirReqStatistics 1" write statistics
- about directory requests to disk every 24 hours. As compared to the
- --enable-geoip-stats flag in 0.2.1.x, there are a few improvements:
- 1) stats are written to disk exactly every 24 hours; 2) estimated
- shares of v2 and v3 requests are determined as mean values, not at
- the end of a measurement period; 3) unresolved requests are listed
- with country code '??'; 4) directories also measure download times.
- - Exit nodes that set "ExitPortStatistics 1" write statistics on the
- number of exit streams and transferred bytes per port to disk every
- 24 hours.
- - Relays that set "CellStatistics 1" write statistics on how long
- cells spend in their circuit queues to disk every 24 hours.
- - Entry nodes that set "EntryStatistics 1" write statistics on the
- rough number and origins of connecting clients to disk every 24
- hours.
- - Relays that write any of the above statistics to disk and set
- "ExtraInfoStatistics 1" include the past 24 hours of statistics in
- their extra-info documents.
- o Minor features:
- - New --digests command-line switch to output the digests of the
- source files Tor was built with.
- - The "torify" script now uses torsocks where available.
- - The memarea code now uses a sentinel value at the end of each area
- to make sure nothing writes beyond the end of an area. This might
- help debug some conceivable causes of bug 930.
- - Time and memory units in the configuration file can now be set to
- fractional units. For example, "2.5 GB" is now a valid value for
- AccountingMax.
- - Certain Tor clients (such as those behind check.torproject.org) may
- want to fetch the consensus in an extra early manner. To enable this
- a user may now set FetchDirInfoExtraEarly to 1. This also depends on
- setting FetchDirInfoEarly to 1. Previous behavior will stay the same
- as only certain clients who must have this information sooner should
- set this option.
- - Instead of adding the svn revision to the Tor version string, report
- the git commit (when we're building from a git checkout).
- o Minor bugfixes:
- - If any of the v3 certs we download are unparseable, we should
- actually notice the failure so we don't retry indefinitely. Bugfix
- on 0.2.0.x; reported by "rotator".
- - If the cached cert file is unparseable, warn but don't exit.
- - Fix possible segmentation fault on directory authorities. Bugfix on
- 0.2.1.14-rc.
- - When Tor fails to parse a descriptor of any kind, dump it to disk.
- Might help diagnosing bug 1051.
- o Deprecated and removed features:
- - The controller no longer accepts the old obsolete "addr-mappings/"
- or "unregistered-servers-" GETINFO values.
- - Hidden services no longer publish version 0 descriptors, and clients
- do not request or use version 0 descriptors. However, the old hidden
- service authorities still accept and serve version 0 descriptors
- when contacted by older hidden services/clients.
- - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
- always on; using them is necessary for correct forward-compatible
- controllers.
- - Remove support for .noconnect style addresses. Nobody was using
- them, and they provided another avenue for detecting Tor users
- via application-level web tricks.
- o Packaging changes:
- - Upgrade Vidalia from 0.1.15 to 0.2.3 in the Windows and OS X
- installer bundles. See
- https://trac.vidalia-project.net/browser/vidalia/tags/vidalia-0.2.3/CHANGELOG
- for details of what's new in Vidalia 0.2.3.
- - Windows Vidalia Bundle: update Privoxy from 3.0.6 to 3.0.14-beta.
- - OS X Vidalia Bundle: move to Polipo 1.0.4 with Tor specific
- configuration file, rather than the old Privoxy.
- - OS X Vidalia Bundle: Vidalia, Tor, and Polipo are compiled as
- x86-only for better compatibility with OS X 10.6, aka Snow Leopard.
- - OS X Tor Expert Bundle: Tor is compiled as x86-only for
- better compatibility with OS X 10.6, aka Snow Leopard.
- - OS X Vidalia Bundle: The multi-package installer is now replaced
- by a simple drag and drop to the /Applications folder. This change
- occurred with the upgrade to Vidalia 0.2.3.
- Changes in version 0.2.1.19 - 2009-07-28
- Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
- services on Tor 0.2.1.3-alpha through 0.2.1.18.
- o Major bugfixes:
- - Make accessing hidden services on 0.2.1.x work right again.
- Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
- part of patch provided by "optimist".
- o Minor features:
- - When a relay/bridge is writing out its identity key fingerprint to
- the "fingerprint" file and to its logs, write it without spaces. Now
- it will look like the fingerprints in our bridges documentation,
- and confuse fewer users.
- o Minor bugfixes:
- - Relays no longer publish a new server descriptor if they change
- their MaxAdvertisedBandwidth config option but it doesn't end up
- changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
- fixes bug 1026. Patch from Sebastian.
- - Avoid leaking memory every time we get a create cell but we have
- so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
- fixes bug 1034. Reported by BarkerJr.
- Changes in version 0.2.1.18 - 2009-07-24
- Tor 0.2.1.18 lays the foundations for performance improvements,
- adds status events to help users diagnose bootstrap problems, adds
- optional authentication/authorization for hidden services, fixes a
- variety of potential anonymity problems, and includes a huge pile of
- other features and bug fixes.
- o Build fixes:
- - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
- Changes in version 0.2.1.17-rc - 2009-07-07
- Tor 0.2.1.17-rc marks the fourth -- and hopefully last -- release
- candidate for the 0.2.1.x series. It lays the groundwork for further
- client performance improvements, and also fixes a big bug with directory
- authorities that were causing them to assign Guard and Stable flags
- poorly.
- The Windows bundles also finally include the geoip database that we
- thought we'd been shipping since 0.2.0.x (oops), and the OS X bundles
- should actually install Torbutton rather than giving you a cryptic
- failure message (oops).
- o Major features:
- - Clients now use the bandwidth values in the consensus, rather than
- the bandwidth values in each relay descriptor. This approach opens
- the door to more accurate bandwidth estimates once the directory
- authorities start doing active measurements. Implements more of
- proposal 141.
- o Major bugfixes:
- - When Tor clients restart after 1-5 days, they discard all their
- cached descriptors as too old, but they still use the cached
- consensus document. This approach is good for robustness, but
- bad for performance: since they don't know any bandwidths, they
- end up choosing at random rather than weighting their choice by
- speed. Fixed by the above feature of putting bandwidths in the
- consensus. Bugfix on 0.2.0.x.
- - Directory authorities were neglecting to mark relays down in their
- internal histories if the relays fall off the routerlist without
- ever being found unreachable. So there were relays in the histories
- that haven't been seen for eight months, and are listed as being
- up for eight months. This wreaked havoc on the "median wfu"
- and "median mtbf" calculations, in turn making Guard and Stable
- flags very wrong, hurting network performance. Fixes bugs 696 and
- 969. Bugfix on 0.2.0.6-alpha.
- o Minor bugfixes:
- - Serve the DirPortFrontPage page even when we have been approaching
- our quotas recently. Fixes bug 1013; bugfix on 0.2.1.8-alpha.
- - The control port would close the connection before flushing long
- replies, such as the network consensus, if a QUIT command was issued
- before the reply had completed. Now, the control port flushes all
- pending replies before closing the connection. Also fixed a spurious
- warning when a QUIT command is issued after a malformed or rejected
- AUTHENTICATE command, but before the connection was closed. Patch
- by Marcus Griep. Bugfix on 0.2.0.x; fixes bugs 1015 and 1016.
- - When we can't find an intro key for a v2 hidden service descriptor,
- fall back to the v0 hidden service descriptor and log a bug message.
- Workaround for bug 1024.
- - Fix a log message that did not respect the SafeLogging option.
- Resolves bug 1027.
- o Minor features:
- - If we're a relay and we change our IP address, be more verbose
- about the reason that made us change. Should help track down
- further bugs for relays on dynamic IP addresses.
- Changes in version 0.2.0.35 - 2009-06-24
- o Security fix:
- - Avoid crashing in the presence of certain malformed descriptors.
- Found by lark, and by automated fuzzing.
- - Fix an edge case where a malicious exit relay could convince a
- controller that the client's DNS question resolves to an internal IP
- address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
- o Major bugfixes:
- - Finally fix the bug where dynamic-IP relays disappear when their
- IP address changes: directory mirrors were mistakenly telling
- them their old address if they asked via begin_dir, so they
- never got an accurate answer about their new address, so they
- just vanished after a day. For belt-and-suspenders, relays that
- don't set Address in their config now avoid using begin_dir for
- all direct connections. Should fix bugs 827, 883, and 900.
- - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
- that would occur on some exit nodes when DNS failures and timeouts
- occurred in certain patterns. Fix for bug 957.
- o Minor bugfixes:
- - When starting with a cache over a few days old, do not leak
- memory for the obsolete router descriptors in it. Bugfix on
- 0.2.0.33; fixes bug 672.
- - Hidden service clients didn't use a cached service descriptor that
- was older than 15 minutes, but wouldn't fetch a new one either,
- because there was already one in the cache. Now, fetch a v2
- descriptor unless the same descriptor was added to the cache within
- the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
- Changes in version 0.2.1.16-rc - 2009-06-20
- Tor 0.2.1.16-rc speeds up performance for fast exit relays, and fixes
- a bunch of minor bugs.
- o Security fixes:
- - Fix an edge case where a malicious exit relay could convince a
- controller that the client's DNS question resolves to an internal IP
- address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
- o Major performance improvements (on 0.2.0.x):
- - Disable and refactor some debugging checks that forced a linear scan
- over the whole server-side DNS cache. These accounted for over 50%
- of CPU time on a relatively busy exit node's gprof profile. Found
- by Jacob.
- - Disable some debugging checks that appeared in exit node profile
- data.
- o Minor features:
- - Update to the "June 3 2009" ip-to-country file.
- - Do not have tor-resolve automatically refuse all .onion addresses;
- if AutomapHostsOnResolve is set in your torrc, this will work fine.
- o Minor bugfixes (on 0.2.0.x):
- - Log correct error messages for DNS-related network errors on
- Windows.
- - Fix a race condition that could cause crashes or memory corruption
- when running as a server with a controller listening for log
- messages.
- - Avoid crashing when we have a policy specified in a DirPolicy or
- SocksPolicy or ReachableAddresses option with ports set on it,
- and we re-load the policy. May fix bug 996.
- - Hidden service clients didn't use a cached service descriptor that
- was older than 15 minutes, but wouldn't fetch a new one either,
- because there was already one in the cache. Now, fetch a v2
- descriptor unless the same descriptor was added to the cache within
- the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
- o Minor bugfixes (on 0.2.1.x):
- - Don't warn users about low port and hibernation mix when they
- provide a *ListenAddress directive to fix that. Bugfix on
- 0.2.1.15-rc.
- - When switching back and forth between bridge mode, do not start
- gathering GeoIP data until two hours have passed.
- - Do not complain that the user has requested an excluded node as
- an exit when the node is not really an exit. This could happen
- because the circuit was for testing, or an introduction point.
- Fix for bug 984.
- Changes in version 0.2.1.15-rc - 2009-05-25
- Tor 0.2.1.15-rc marks the second release candidate for the 0.2.1.x
- series. It fixes a major bug on fast exit relays, as well as a variety
- of more minor bugs.
- o Major bugfixes (on 0.2.0.x):
- - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
- that would occur on some exit nodes when DNS failures and timeouts
- occurred in certain patterns. Fix for bug 957.
- o Minor bugfixes (on 0.2.0.x):
- - Actually return -1 in the error case for read_bandwidth_usage().
- Harmless bug, since we currently don't care about the return value
- anywhere. Bugfix on 0.2.0.9-alpha.
- - Provide a more useful log message if bug 977 (related to buffer
- freelists) ever reappears, and do not crash right away.
- - Fix an assertion failure on 64-bit platforms when we allocated
- memory right up to the end of a memarea, then realigned the memory
- one step beyond the end. Fixes a possible cause of bug 930.
- - Protect the count of open sockets with a mutex, so we can't
- corrupt it when two threads are closing or opening sockets at once.
- Fix for bug 939. Bugfix on 0.2.0.1-alpha.
- - Don't allow a bridge to publish its router descriptor to a
- non-bridge directory authority. Fixes part of bug 932.
- - When we change to or from being a bridge, reset our counts of
- client usage by country. Fixes bug 932.
- - Fix a bug that made stream bandwidth get misreported to the
- controller.
- - Stop using malloc_usable_size() to use more area than we had
- actually allocated: it was safe, but made valgrind really unhappy.
- - Fix a memory leak when v3 directory authorities load their keys
- and cert from disk. Bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (on 0.2.1.x):
- - Fix use of freed memory when deciding to mark a non-addable
- descriptor as never-downloadable. Bugfix on 0.2.1.9-alpha.
- Changes in version 0.2.1.14-rc - 2009-04-12
- Tor 0.2.1.14-rc marks the first release candidate for the 0.2.1.x
- series. It begins fixing some major performance problems, and also
- finally addresses the bug that was causing relays on dynamic IP
- addresses to fall out of the directory.
- o Major features:
- - Clients replace entry guards that were chosen more than a few months
- ago. This change should significantly improve client performance,
- especially once more people upgrade, since relays that have been
- a guard for a long time are currently overloaded.
- o Major bugfixes (on 0.2.0):
- - Finally fix the bug where dynamic-IP relays disappear when their
- IP address changes: directory mirrors were mistakenly telling
- them their old address if they asked via begin_dir, so they
- never got an accurate answer about their new address, so they
- just vanished after a day. For belt-and-suspenders, relays that
- don't set Address in their config now avoid using begin_dir for
- all direct connections. Should fix bugs 827, 883, and 900.
- - Relays were falling out of the networkstatus consensus for
- part of a day if they changed their local config but the
- authorities discarded their new descriptor as "not sufficiently
- different". Now directory authorities accept a descriptor as changed
- if bandwidthrate or bandwidthburst changed. Partial fix for bug 962;
- patch by Sebastian.
- - Avoid crashing in the presence of certain malformed descriptors.
- Found by lark, and by automated fuzzing.
- o Minor features:
- - When generating circuit events with verbose nicknames for
- controllers, try harder to look up nicknames for routers on a
- circuit. (Previously, we would look in the router descriptors we had
- for nicknames, but not in the consensus.) Partial fix for bug 941.
- - If the bridge config line doesn't specify a port, assume 443.
- This makes bridge lines a bit smaller and easier for users to
- understand.
- - Raise the minimum bandwidth to be a relay from 20000 bytes to 20480
- bytes (aka 20KB/s), to match our documentation. Also update
- directory authorities so they always assign the Fast flag to relays
- with 20KB/s of capacity. Now people running relays won't suddenly
- find themselves not seeing any use, if the network gets faster
- on average.
- - Update to the "April 3 2009" ip-to-country file.
- o Minor bugfixes:
- - Avoid trying to print raw memory to the logs when we decide to
- give up on downloading a given relay descriptor. Bugfix on
- 0.2.1.9-alpha.
- - In tor-resolve, when the Tor client to use is specified by
- <hostname>:<port>, actually use the specified port rather than
- defaulting to 9050. Bugfix on 0.2.1.6-alpha.
- - Make directory usage recording work again. Bugfix on 0.2.1.6-alpha.
- - When starting with a cache over a few days old, do not leak
- memory for the obsolete router descriptors in it. Bugfix on
- 0.2.0.33.
- - Avoid double-free on list of successfully uploaded hidden
- service discriptors. Fix for bug 948. Bugfix on 0.2.1.6-alpha.
- - Change memarea_strndup() implementation to work even when
- duplicating a string at the end of a page. This bug was
- harmless for now, but could have meant crashes later. Fix by
- lark. Bugfix on 0.2.1.1-alpha.
- - Limit uploaded directory documents to be 16M rather than 500K.
- The directory authorities were refusing v3 consensus votes from
- other authorities, since the votes are now 504K. Fixes bug 959;
- bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
- - Directory authorities should never send a 503 "busy" response to
- requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
- bug 959.
- Changes in version 0.2.1.13-alpha - 2009-03-09
- Tor 0.2.1.13-alpha includes another big pile of minor bugfixes and
- cleanups. We're finally getting close to a release candidate.
- o Major bugfixes:
- - Correctly update the list of which countries we exclude as
- exits, when the GeoIP file is loaded or reloaded. Diagnosed by
- lark. Bugfix on 0.2.1.6-alpha.
- o Minor bugfixes (on 0.2.0.x and earlier):
- - Automatically detect MacOSX versions earlier than 10.4.0, and
- disable kqueue from inside Tor when running with these versions.
- We previously did this from the startup script, but that was no
- help to people who didn't use the startup script. Resolves bug 863.
- - When we had picked an exit node for a connection, but marked it as
- "optional", and it turned out we had no onion key for the exit,
- stop wanting that exit and try again. This situation may not
- be possible now, but will probably become feasible with proposal
- 158. Spotted by rovv. Fixes another case of bug 752.
- - Clients no longer cache certificates for authorities they do not
- recognize. Bugfix on 0.2.0.9-alpha.
- - When we can't transmit a DNS request due to a network error, retry
- it after a while, and eventually transmit a failing response to
- the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
- - If the controller claimed responsibility for a stream, but that
- stream never finished making its connection, it would live
- forever in circuit_wait state. Now we close it after SocksTimeout
- seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
- - Drop begin cells to a hidden service if they come from the middle
- of a circuit. Patch from lark.
- - When we erroneously receive two EXTEND cells for the same circuit
- ID on the same connection, drop the second. Patch from lark.
- - Fix a crash that occurs on exit nodes when a nameserver request
- timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
- been suppressing the bug since 0.1.2.10-alpha. Partial fix for
- bug 929.
- - Do not assume that a stack-allocated character array will be
- 64-bit aligned on platforms that demand that uint64_t access is
- aligned. Possible fix for bug 604.
- - Parse dates and IPv4 addresses in a locale- and libc-independent
- manner, to avoid platform-dependent behavior on malformed input.
- - Build correctly when configured to build outside the main source
- path. Patch from Michael Gold.
- - We were already rejecting relay begin cells with destination port
- of 0. Now also reject extend cells with destination port or address
- of 0. Suggested by lark.
- o Minor bugfixes (on 0.2.1.x):
- - Don't re-extend introduction circuits if we ran out of RELAY_EARLY
- cells. Bugfix on 0.2.1.3-alpha. Fixes more of bug 878.
- - If we're an exit node, scrub the IP address to which we are exiting
- in the logs. Bugfix on 0.2.1.8-alpha.
- o Minor features:
- - On Linux, use the prctl call to re-enable core dumps when the user
- is option is set.
- - New controller event NEWCONSENSUS that lists the networkstatus
- lines for every recommended relay. Now controllers like Torflow
- can keep up-to-date on which relays they should be using.
- - Update to the "February 26 2009" ip-to-country file.
- Changes in version 0.2.0.34 - 2009-02-08
- Tor 0.2.0.34 features several more security-related fixes. You should
- upgrade, especially if you run an exit relay (remote crash) or a
- directory authority (remote infinite loop), or you're on an older
- (pre-XP) or not-recently-patched Windows (remote exploit).
- This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
- have many known flaws, and nobody should be using them. You should
- upgrade. If you're using a Linux or BSD and its packages are obsolete,
- stop using those packages and upgrade anyway.
- o Security fixes:
- - Fix an infinite-loop bug on handling corrupt votes under certain
- circumstances. Bugfix on 0.2.0.8-alpha.
- - Fix a temporary DoS vulnerability that could be performed by
- a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
- - Avoid a potential crash on exit nodes when processing malformed
- input. Remote DoS opportunity. Bugfix on 0.2.0.33.
- - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
- Spec conformance issue. Bugfix on Tor 0.0.2pre27.
- o Minor bugfixes:
- - Fix compilation on systems where time_t is a 64-bit integer.
- Patch from Matthias Drochner.
- - Don't consider expiring already-closed client connections. Fixes
- bug 893. Bugfix on 0.0.2pre20.
- Changes in version 0.2.1.12-alpha - 2009-02-08
- Tor 0.2.1.12-alpha features several more security-related fixes. You
- should upgrade, especially if you run an exit relay (remote crash) or
- a directory authority (remote infinite loop), or you're on an older
- (pre-XP) or not-recently-patched Windows (remote exploit). It also
- includes a big pile of minor bugfixes and cleanups.
- o Security fixes:
- - Fix an infinite-loop bug on handling corrupt votes under certain
- circumstances. Bugfix on 0.2.0.8-alpha.
- - Fix a temporary DoS vulnerability that could be performed by
- a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
- - Avoid a potential crash on exit nodes when processing malformed
- input. Remote DoS opportunity. Bugfix on 0.2.1.7-alpha.
- o Minor bugfixes:
- - Let controllers actually ask for the "clients_seen" event for
- getting usage summaries on bridge relays. Bugfix on 0.2.1.10-alpha;
- reported by Matt Edman.
- - Fix a compile warning on OSX Panther. Fixes bug 913; bugfix against
- 0.2.1.11-alpha.
- - Fix a bug in address parsing that was preventing bridges or hidden
- service targets from being at IPv6 addresses.
- - Solve a bug that kept hardware crypto acceleration from getting
- enabled when accounting was turned on. Fixes bug 907. Bugfix on
- 0.0.9pre6.
- - Remove a bash-ism from configure.in to build properly on non-Linux
- platforms. Bugfix on 0.2.1.1-alpha.
- - Fix code so authorities _actually_ send back X-Descriptor-Not-New
- headers. Bugfix on 0.2.0.10-alpha.
- - Don't consider expiring already-closed client connections. Fixes
- bug 893. Bugfix on 0.0.2pre20.
- - Fix another interesting corner-case of bug 891 spotted by rovv:
- Previously, if two hosts had different amounts of clock drift, and
- one of them created a new connection with just the wrong timing,
- the other might decide to deprecate the new connection erroneously.
- Bugfix on 0.1.1.13-alpha.
- - Resolve a very rare crash bug that could occur when the user forced
- a nameserver reconfiguration during the middle of a nameserver
- probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
- - Support changing value of ServerDNSRandomizeCase during SIGHUP.
- Bugfix on 0.2.1.7-alpha.
- - If we're using bridges and our network goes away, be more willing
- to forgive our bridges and try again when we get an application
- request. Bugfix on 0.2.0.x.
- o Minor features:
- - Support platforms where time_t is 64 bits long. (Congratulations,
- NetBSD!) Patch from Matthias Drochner.
- - Add a 'getinfo status/clients-seen' controller command, in case
- controllers want to hear clients_seen events but connect late.
- o Build changes:
- - Disable GCC's strict alias optimization by default, to avoid the
- likelihood of its introducing subtle bugs whenever our code violates
- the letter of C99's alias rules.
- Changes in version 0.2.0.33 - 2009-01-21
- Tor 0.2.0.33 fixes a variety of bugs that were making relays less
- useful to users. It also finally fixes a bug where a relay or client
- that's been off for many days would take a long time to bootstrap.
- This update also fixes an important security-related bug reported by
- Ilja van Sprundel. You should upgrade. (We'll send out more details
- about the bug once people have had some time to upgrade.)
- o Security fixes:
- - Fix a heap-corruption bug that may be remotely triggerable on
- some platforms. Reported by Ilja van Sprundel.
- o Major bugfixes:
- - When a stream at an exit relay is in state "resolving" or
- "connecting" and it receives an "end" relay cell, the exit relay
- would silently ignore the end cell and not close the stream. If
- the client never closes the circuit, then the exit relay never
- closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
- reported by "wood".
- - When sending CREATED cells back for a given circuit, use a 64-bit
- connection ID to find the right connection, rather than an addr:port
- combination. Now that we can have multiple OR connections between
- the same ORs, it is no longer possible to use addr:port to uniquely
- identify a connection.
- - Bridge relays that had DirPort set to 0 would stop fetching
- descriptors shortly after startup, and then briefly resume
- after a new bandwidth test and/or after publishing a new bridge
- descriptor. Bridge users that try to bootstrap from them would
- get a recent networkstatus but would get descriptors from up to
- 18 hours earlier, meaning most of the descriptors were obsolete
- already. Reported by Tas; bugfix on 0.2.0.13-alpha.
- - Prevent bridge relays from serving their 'extrainfo' document
- to anybody who asks, now that extrainfo docs include potentially
- sensitive aggregated client geoip summaries. Bugfix on
- 0.2.0.13-alpha.
- - If the cached networkstatus consensus is more than five days old,
- discard it rather than trying to use it. In theory it could be
- useful because it lists alternate directory mirrors, but in practice
- it just means we spend many minutes trying directory mirrors that
- are long gone from the network. Also discard router descriptors as
- we load them if they are more than five days old, since the onion
- key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
- o Minor bugfixes:
- - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
- could make gcc generate non-functional binary search code. Bugfix
- on 0.2.0.10-alpha.
- - Build correctly on platforms without socklen_t.
- - Compile without warnings on solaris.
- - Avoid potential crash on internal error during signature collection.
- Fixes bug 864. Patch from rovv.
- - Correct handling of possible malformed authority signing key
- certificates with internal signature types. Fixes bug 880.
- Bugfix on 0.2.0.3-alpha.
- - Fix a hard-to-trigger resource leak when logging credential status.
- CID 349.
- - When we can't initialize DNS because the network is down, do not
- automatically stop Tor from starting. Instead, we retry failed
- dns_init() every 10 minutes, and change the exit policy to reject
- *:* until one succeeds. Fixes bug 691.
- - Use 64 bits instead of 32 bits for connection identifiers used with
- the controller protocol, to greatly reduce risk of identifier reuse.
- - When we're choosing an exit node for a circuit, and we have
- no pending streams, choose a good general exit rather than one that
- supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
- - Fix another case of assuming, when a specific exit is requested,
- that we know more than the user about what hosts it allows.
- Fixes one case of bug 752. Patch from rovv.
- - Clip the MaxCircuitDirtiness config option to a minimum of 10
- seconds. Warn the user if lower values are given in the
- configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
- - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
- user if lower values are given in the configuration. Bugfix on
- 0.1.1.17-rc. Patch by Sebastian.
- - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
- the cache because we already had a v0 descriptor with the same ID.
- Bugfix on 0.2.0.18-alpha.
- - Fix a race condition when freeing keys shared between main thread
- and CPU workers that could result in a memory leak. Bugfix on
- 0.1.0.1-rc. Fixes bug 889.
- - Send a valid END cell back when a client tries to connect to a
- nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
- 840. Patch from rovv.
- - Check which hops rendezvous stream cells are associated with to
- prevent possible guess-the-streamid injection attacks from
- intermediate hops. Fixes another case of bug 446. Based on patch
- from rovv.
- - If a broken client asks a non-exit router to connect somewhere,
- do not even do the DNS lookup before rejecting the connection.
- Fixes another case of bug 619. Patch from rovv.
- - When a relay gets a create cell it can't decrypt (e.g. because it's
- using the wrong onion key), we were dropping it and letting the
- client time out. Now actually answer with a destroy cell. Fixes
- bug 904. Bugfix on 0.0.2pre8.
- o Minor bugfixes (hidden services):
- - Do not throw away existing introduction points on SIGHUP. Bugfix on
- 0.0.6pre1. Patch by Karsten. Fixes bug 874.
- o Minor features:
- - Report the case where all signatures in a detached set are rejected
- differently than the case where there is an error handling the
- detached set.
- - When we realize that another process has modified our cached
- descriptors, print out a more useful error message rather than
- triggering an assertion. Fixes bug 885. Patch from Karsten.
- - Implement the 0x20 hack to better resist DNS poisoning: set the
- case on outgoing DNS requests randomly, and reject responses that do
- not match the case correctly. This logic can be disabled with the
- ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
- of servers that do not reliably preserve case in replies. See
- "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
- for more info.
- - Check DNS replies for more matching fields to better resist DNS
- poisoning.
- - Never use OpenSSL compression: it wastes RAM and CPU trying to
- compress cells, which are basically all encrypted, compressed, or
- both.
- Changes in version 0.2.1.11-alpha - 2009-01-20
- Tor 0.2.1.11-alpha finishes fixing the "if your Tor is off for a
- week it will take a long time to bootstrap again" bug. It also fixes
- an important security-related bug reported by Ilja van Sprundel. You
- should upgrade. (We'll send out more details about the bug once people
- have had some time to upgrade.)
- o Security fixes:
- - Fix a heap-corruption bug that may be remotely triggerable on
- some platforms. Reported by Ilja van Sprundel.
- o Major bugfixes:
- - Discard router descriptors as we load them if they are more than
- five days old. Otherwise if Tor is off for a long time and then
- starts with cached descriptors, it will try to use the onion
- keys in those obsolete descriptors when building circuits. Bugfix
- on 0.2.0.x. Fixes bug 887.
- o Minor features:
- - Try to make sure that the version of Libevent we're running with
- is binary-compatible with the one we built with. May address bug
- 897 and others.
- - Make setting ServerDNSRandomizeCase to 0 actually work. Bugfix
- for bug 905. Bugfix on 0.2.1.7-alpha.
- - Add a new --enable-local-appdata configuration switch to change
- the default location of the datadir on win32 from APPDATA to
- LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
- entirely. Patch from coderman.
- o Minor bugfixes:
- - Make outbound DNS packets respect the OutboundBindAddress setting.
- Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
- - When our circuit fails at the first hop (e.g. we get a destroy
- cell back), avoid using that OR connection anymore, and also
- tell all the one-hop directory requests waiting for it that they
- should fail. Bugfix on 0.2.1.3-alpha.
- - In the torify(1) manpage, mention that tsocks will leak your
- DNS requests.
- Changes in version 0.2.1.10-alpha - 2009-01-06
- Tor 0.2.1.10-alpha fixes two major bugs in bridge relays (one that
- would make the bridge relay not so useful if it had DirPort set to 0,
- and one that could let an attacker learn a little bit of information
- about the bridge's users), and a bug that would cause your Tor relay
- to ignore a circuit create request it can't decrypt (rather than reply
- with an error). It also fixes a wide variety of other bugs.
- o Major bugfixes:
- - If the cached networkstatus consensus is more than five days old,
- discard it rather than trying to use it. In theory it could
- be useful because it lists alternate directory mirrors, but in
- practice it just means we spend many minutes trying directory
- mirrors that are long gone from the network. Helps bug 887 a bit;
- bugfix on 0.2.0.x.
- - Bridge relays that had DirPort set to 0 would stop fetching
- descriptors shortly after startup, and then briefly resume
- after a new bandwidth test and/or after publishing a new bridge
- descriptor. Bridge users that try to bootstrap from them would
- get a recent networkstatus but would get descriptors from up to
- 18 hours earlier, meaning most of the descriptors were obsolete
- already. Reported by Tas; bugfix on 0.2.0.13-alpha.
- - Prevent bridge relays from serving their 'extrainfo' document
- to anybody who asks, now that extrainfo docs include potentially
- sensitive aggregated client geoip summaries. Bugfix on
- 0.2.0.13-alpha.
- o Minor features:
- - New controller event "clients_seen" to report a geoip-based summary
- of which countries we've seen clients from recently. Now controllers
- like Vidalia can show bridge operators that they're actually making
- a difference.
- - Build correctly against versions of OpenSSL 0.9.8 or later built
- without support for deprecated functions.
- - Update to the "December 19 2008" ip-to-country file.
- o Minor bugfixes (on 0.2.0.x):
- - Authorities now vote for the Stable flag for any router whose
- weighted MTBF is at least 5 days, regardless of the mean MTBF.
- - Do not remove routers as too old if we do not have any consensus
- document. Bugfix on 0.2.0.7-alpha.
- - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
- Spec conformance issue. Bugfix on Tor 0.0.2pre27.
- - When an exit relay resolves a stream address to a local IP address,
- do not just keep retrying that same exit relay over and
- over. Instead, just close the stream. Addresses bug 872. Bugfix
- on 0.2.0.32. Patch from rovv.
- - If a hidden service sends us an END cell, do not consider
- retrying the connection; just close it. Patch from rovv.
- - When we made bridge authorities stop serving bridge descriptors over
- unencrypted links, we also broke DirPort reachability testing for
- bridges. So bridges with a non-zero DirPort were printing spurious
- warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
- - When a relay gets a create cell it can't decrypt (e.g. because it's
- using the wrong onion key), we were dropping it and letting the
- client time out. Now actually answer with a destroy cell. Fixes
- bug 904. Bugfix on 0.0.2pre8.
- - Squeeze 2-5% out of client performance (according to oprofile) by
- improving the implementation of some policy-manipulation functions.
- o Minor bugfixes (on 0.2.1.x):
- - Make get_interface_address() function work properly again; stop
- guessing the wrong parts of our address as our address.
- - Do not cannibalize a circuit if we're out of RELAY_EARLY cells to
- send on that circuit. Otherwise we might violate the proposal-110
- limit. Bugfix on 0.2.1.3-alpha. Partial fix for bug 878. Diagnosis
- thanks to Karsten.
- - When we're sending non-EXTEND cells to the first hop in a circuit,
- for example to use an encrypted directory connection, we don't need
- to use RELAY_EARLY cells: the first hop knows what kind of cell
- it is, and nobody else can even see the cell type. Conserving
- RELAY_EARLY cells makes it easier to cannibalize circuits like
- this later.
- - Stop logging nameserver addresses in reverse order.
- - If we are retrying a directory download slowly over and over, do
- not automatically give up after the 254th failure. Bugfix on
- 0.2.1.9-alpha.
- - Resume reporting accurate "stream end" reasons to the local control
- port. They were lost in the changes for Proposal 148. Bugfix on
- 0.2.1.9-alpha.
- o Deprecated and removed features:
- - The old "tor --version --version" command, which would print out
- the subversion "Id" of most of the source files, is now removed. It
- turned out to be less useful than we'd expected, and harder to
- maintain.
- o Code simplifications and refactoring:
- - Change our header file guard macros to be less likely to conflict
- with system headers. Adam Langley noticed that we were conflicting
- with log.h on Android.
- - Tool-assisted documentation cleanup. Nearly every function or
- static variable in Tor should have its own documentation now.
- Changes in version 0.2.1.9-alpha - 2008-12-25
- Tor 0.2.1.9-alpha fixes many more bugs, some of them security-related.
- o New directory authorities:
- - gabelmoo (the authority run by Karsten Loesing) now has a new
- IP address.
- o Security fixes:
- - Never use a connection with a mismatched address to extend a
- circuit, unless that connection is canonical. A canonical
- connection is one whose address is authenticated by the router's
- identity key, either in a NETINFO cell or in a router descriptor.
- - Avoid a possible memory corruption bug when receiving hidden service
- descriptors. Bugfix on 0.2.1.6-alpha.
- o Major bugfixes:
- - Fix a logic error that would automatically reject all but the first
- configured DNS server. Bugfix on 0.2.1.5-alpha. Possible fix for
- part of bug 813/868. Bug spotted by coderman.
- - When a stream at an exit relay is in state "resolving" or
- "connecting" and it receives an "end" relay cell, the exit relay
- would silently ignore the end cell and not close the stream. If
- the client never closes the circuit, then the exit relay never
- closes the TCP connection. Bug introduced in 0.1.2.1-alpha;
- reported by "wood".
- - When we can't initialize DNS because the network is down, do not
- automatically stop Tor from starting. Instead, retry failed
- dns_init() every 10 minutes, and change the exit policy to reject
- *:* until one succeeds. Fixes bug 691.
- o Minor features:
- - Give a better error message when an overzealous init script says
- "sudo -u username tor --user username". Makes Bug 882 easier for
- users to diagnose.
- - When a directory authority gives us a new guess for our IP address,
- log which authority we used. Hopefully this will help us debug
- the recent complaints about bad IP address guesses.
- - Detect svn revision properly when we're using git-svn.
- - Try not to open more than one descriptor-downloading connection
- to an authority at once. This should reduce load on directory
- authorities. Fixes bug 366.
- - Add cross-certification to newly generated certificates, so that
- a signing key is enough information to look up a certificate.
- Partial implementation of proposal 157.
- - Start serving certificates by <identity digest, signing key digest>
- pairs. Partial implementation of proposal 157.
- - Clients now never report any stream end reason except 'MISC'.
- Implements proposal 148.
- - On platforms with a maximum syslog string length, truncate syslog
- messages to that length ourselves, rather than relying on the
- system to do it for us.
- - Optimize out calls to time(NULL) that occur for every IO operation,
- or for every cell. On systems where time() is a slow syscall,
- this fix will be slightly helpful.
- - Exit servers can now answer resolve requests for ip6.arpa addresses.
- - When we download a descriptor that we then immediately (as
- a directory authority) reject, do not retry downloading it right
- away. Should save some bandwidth on authorities. Fix for bug
- 888. Patch by Sebastian Hahn.
- - When a download gets us zero good descriptors, do not notify
- Tor that new directory information has arrived.
- - Avoid some nasty corner cases in the logic for marking connections
- as too old or obsolete or noncanonical for circuits. Partial
- bugfix on bug 891.
- o Minor features (controller):
- - New CONSENSUS_ARRIVED event to note when a new consensus has
- been fetched and validated.
- - When we realize that another process has modified our cached
- descriptors file, print out a more useful error message rather
- than triggering an assertion. Fixes bug 885. Patch from Karsten.
- - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
- controllers to prevent SIGHUP from reloading the
- configuration. Fixes bug 856.
- o Minor bugfixes:
- - Resume using the correct "REASON=" stream when telling the
- controller why we closed a stream. Bugfix in 0.2.1.1-alpha.
- - When a canonical connection appears later in our internal list
- than a noncanonical one for a given OR ID, always use the
- canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
- Spotted by rovv.
- - Clip the MaxCircuitDirtiness config option to a minimum of 10
- seconds. Warn the user if lower values are given in the
- configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
- - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
- user if lower values are given in the configuration. Bugfix on
- 0.1.1.17-rc. Patch by Sebastian.
- - Fix a race condition when freeing keys shared between main thread
- and CPU workers that could result in a memory leak. Bugfix on
- 0.1.0.1-rc. Fixes bug 889.
- o Minor bugfixes (hidden services):
- - Do not throw away existing introduction points on SIGHUP (bugfix on
- 0.0.6pre1); also, do not stall hidden services because we're
- throwing away introduction points; bugfix on 0.2.1.7-alpha. Spotted
- by John Brooks. Patch by Karsten. Fixes bug 874.
- - Fix a memory leak when we decline to add a v2 rendezvous
- descriptor to the cache because we already had a v0 descriptor
- with the same ID. Bugfix on 0.2.0.18-alpha.
- o Deprecated and removed features:
- - RedirectExits has been removed. It was deprecated since
- 0.2.0.3-alpha.
- - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
- has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
- - Cell pools are now always enabled; --disable-cell-pools is ignored.
- o Code simplifications and refactoring:
- - Rename the confusing or_is_obsolete field to the more appropriate
- is_bad_for_new_circs, and move it to or_connection_t where it
- belongs.
- - Move edge-only flags from connection_t to edge_connection_t: not
- only is this better coding, but on machines of plausible alignment,
- it should save 4-8 bytes per connection_t. "Every little bit helps."
- - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
- for consistency; keep old option working for backward compatibility.
- - Simplify the code for finding connections to use for a circuit.
- Changes in version 0.2.1.8-alpha - 2008-12-08
- Tor 0.2.1.8-alpha fixes some crash bugs in earlier alpha releases,
- builds better on unusual platforms like Solaris and old OS X, and
- fixes a variety of other issues.
- o Major features:
- - New DirPortFrontPage option that takes an html file and publishes
- it as "/" on the DirPort. Now relay operators can provide a
- disclaimer without needing to set up a separate webserver. There's
- a sample disclaimer in contrib/tor-exit-notice.html.
- o Security fixes:
- - When the client is choosing entry guards, now it selects at most
- one guard from a given relay family. Otherwise we could end up with
- all of our entry points into the network run by the same operator.
- Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
- o Major bugfixes:
- - Fix a DOS opportunity during the voting signature collection process
- at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
- - Fix a possible segfault when establishing an exit connection. Bugfix
- on 0.2.1.5-alpha.
- o Minor bugfixes:
- - Get file locking working on win32. Bugfix on 0.2.1.6-alpha. Fixes
- bug 859.
- - Made Tor a little less aggressive about deleting expired
- certificates. Partial fix for bug 854.
- - Stop doing unaligned memory access that generated bus errors on
- sparc64. Bugfix on 0.2.0.10-alpha. Fix for bug 862.
- - Fix a crash bug when changing EntryNodes from the controller. Bugfix
- on 0.2.1.6-alpha. Fix for bug 867. Patched by Sebastian.
- - Make USR2 log-level switch take effect immediately. Bugfix on
- 0.1.2.8-beta.
- - If one win32 nameserver fails to get added, continue adding the
- rest, and don't automatically fail.
- - Use fcntl() for locking when flock() is not available. Should fix
- compilation on Solaris. Should fix Bug 873. Bugfix on 0.2.1.6-alpha.
- - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
- could make gcc generate non-functional binary search code. Bugfix
- on 0.2.0.10-alpha.
- - Build correctly on platforms without socklen_t.
- - Avoid potential crash on internal error during signature collection.
- Fixes bug 864. Patch from rovv.
- - Do not use C's stdio library for writing to log files. This will
- improve logging performance by a minute amount, and will stop
- leaking fds when our disk is full. Fixes bug 861.
- - Stop erroneous use of O_APPEND in cases where we did not in fact
- want to re-seek to the end of a file before every last write().
- - Correct handling of possible malformed authority signing key
- certificates with internal signature types. Fixes bug 880. Bugfix
- on 0.2.0.3-alpha.
- - Fix a hard-to-trigger resource leak when logging credential status.
- CID 349.
- o Minor features:
- - Directory mirrors no longer fetch the v1 directory or
- running-routers files. They are obsolete, and nobody asks for them
- anymore. This is the first step to making v1 authorities obsolete.
- o Minor features (controller):
- - Return circuit purposes in response to GETINFO circuit-status. Fixes
- bug 858.
- Changes in version 0.2.0.32 - 2008-11-20
- Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
- packages (and maybe other packages) noticed by Theo de Raadt, fixes
- a smaller security flaw that might allow an attacker to access local
- services, further improves hidden service performance, and fixes a
- variety of other issues.
- o Security fixes:
- - The "User" and "Group" config options did not clear the
- supplementary group entries for the Tor process. The "User" option
- is now more robust, and we now set the groups to the specified
- user's primary group. The "Group" option is now ignored. For more
- detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
- in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
- and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
- - The "ClientDNSRejectInternalAddresses" config option wasn't being
- consistently obeyed: if an exit relay refuses a stream because its
- exit policy doesn't allow it, we would remember what IP address
- the relay said the destination address resolves to, even if it's
- an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
- o Major bugfixes:
- - Fix a DOS opportunity during the voting signature collection process
- at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
- o Major bugfixes (hidden services):
- - When fetching v0 and v2 rendezvous service descriptors in parallel,
- we were failing the whole hidden service request when the v0
- descriptor fetch fails, even if the v2 fetch is still pending and
- might succeed. Similarly, if the last v2 fetch fails, we were
- failing the whole hidden service request even if a v0 fetch is
- still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
- - When extending a circuit to a hidden service directory to upload a
- rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
- requests failed, because the router descriptor has not been
- downloaded yet. In these cases, do not attempt to upload the
- rendezvous descriptor, but wait until the router descriptor is
- downloaded and retry. Likewise, do not attempt to fetch a rendezvous
- descriptor from a hidden service directory for which the router
- descriptor has not yet been downloaded. Fixes bug 767. Bugfix
- on 0.2.0.10-alpha.
- o Minor bugfixes:
- - Fix several infrequent memory leaks spotted by Coverity.
- - When testing for libevent functions, set the LDFLAGS variable
- correctly. Found by Riastradh.
- - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
- bootstrapping with tunneled directory connections. Bugfix on
- 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
- - When asked to connect to A.B.exit:80, if we don't know the IP for A
- and we know that server B rejects most-but-not all connections to
- port 80, we would previously reject the connection. Now, we assume
- the user knows what they were asking for. Fixes bug 752. Bugfix
- on 0.0.9rc5. Diagnosed by BarkerJr.
- - If we overrun our per-second write limits a little, count this as
- having used up our write allocation for the second, and choke
- outgoing directory writes. Previously, we had only counted this when
- we had met our limits precisely. Fixes bug 824. Patch from by rovv.
- Bugfix on 0.2.0.x (??).
- - Remove the old v2 directory authority 'lefkada' from the default
- list. It has been gone for many months.
- - Stop doing unaligned memory access that generated bus errors on
- sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
- - Make USR2 log-level switch take effect immediately. Bugfix on
- 0.1.2.8-beta.
- o Minor bugfixes (controller):
- - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
- 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
- Changes in version 0.2.1.7-alpha - 2008-11-08
- Tor 0.2.1.7-alpha fixes a major security problem in Debian and Ubuntu
- packages (and maybe other packages) noticed by Theo de Raadt, fixes
- a smaller security flaw that might allow an attacker to access local
- services, adds better defense against DNS poisoning attacks on exit
- relays, further improves hidden service performance, and fixes a
- variety of other issues.
- o Security fixes:
- - The "ClientDNSRejectInternalAddresses" config option wasn't being
- consistently obeyed: if an exit relay refuses a stream because its
- exit policy doesn't allow it, we would remember what IP address
- the relay said the destination address resolves to, even if it's
- an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
- - The "User" and "Group" config options did not clear the
- supplementary group entries for the Tor process. The "User" option
- is now more robust, and we now set the groups to the specified
- user's primary group. The "Group" option is now ignored. For more
- detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
- in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
- and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848.
- - Do not use or believe expired v3 authority certificates. Patch
- from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
- o Minor features:
- - Now NodeFamily and MyFamily config options allow spaces in
- identity fingerprints, so it's easier to paste them in.
- Suggested by Lucky Green.
- - Implement the 0x20 hack to better resist DNS poisoning: set the
- case on outgoing DNS requests randomly, and reject responses that do
- not match the case correctly. This logic can be disabled with the
- ServerDNSRandomizeCase setting, if you are using one of the 0.3%
- of servers that do not reliably preserve case in replies. See
- "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
- for more info.
- - Preserve case in replies to DNSPort requests in order to support
- the 0x20 hack for resisting DNS poisoning attacks.
- o Hidden service performance improvements:
- - When the client launches an introduction circuit, retry with a
- new circuit after 30 seconds rather than 60 seconds.
- - Launch a second client-side introduction circuit in parallel
- after a delay of 15 seconds (based on work by Christian Wilms).
- - Hidden services start out building five intro circuits rather
- than three, and when the first three finish they publish a service
- descriptor using those. Now we publish our service descriptor much
- faster after restart.
- o Minor bugfixes:
- - Minor fix in the warning messages when you're having problems
- bootstrapping; also, be more forgiving of bootstrap problems when
- we're still making incremental progress on a given bootstrap phase.
- - When we're choosing an exit node for a circuit, and we have
- no pending streams, choose a good general exit rather than one that
- supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
- - Send a valid END cell back when a client tries to connect to a
- nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
- 840. Patch from rovv.
- - If a broken client asks a non-exit router to connect somewhere,
- do not even do the DNS lookup before rejecting the connection.
- Fixes another case of bug 619. Patch from rovv.
- - Fix another case of assuming, when a specific exit is requested,
- that we know more than the user about what hosts it allows.
- Fixes another case of bug 752. Patch from rovv.
- - Check which hops rendezvous stream cells are associated with to
- prevent possible guess-the-streamid injection attacks from
- intermediate hops. Fixes another case of bug 446. Based on patch
- from rovv.
- - Avoid using a negative right-shift when comparing 32-bit
- addresses. Possible fix for bug 845 and bug 811.
- - Make the assert_circuit_ok() function work correctly on circuits that
- have already been marked for close.
- - Fix read-off-the-end-of-string error in unit tests when decoding
- introduction points.
- - Fix uninitialized size field for memory area allocation: may improve
- memory performance during directory parsing.
- - Treat duplicate certificate fetches as failures, so that we do
- not try to re-fetch an expired certificate over and over and over.
- - Do not say we're fetching a certificate when we'll in fact skip it
- because of a pending download.
- Changes in version 0.2.1.6-alpha - 2008-09-30
- Tor 0.2.1.6-alpha further improves performance and robustness of
- hidden services, starts work on supporting per-country relay selection,
- and fixes a variety of smaller issues.
- o Major features:
- - Implement proposal 121: make it possible to build hidden services
- that only certain clients are allowed to connect to. This is
- enforced at several points, so that unauthorized clients are unable
- to send INTRODUCE cells to the service, or even (depending on the
- type of authentication) to learn introduction points. This feature
- raises the bar for certain kinds of active attacks against hidden
- services. Code by Karsten Loesing.
- - Relays now store and serve v2 hidden service descriptors by default,
- i.e., the new default value for HidServDirectoryV2 is 1. This is
- the last step in proposal 114, which aims to make hidden service
- lookups more reliable.
- - Start work to allow node restrictions to include country codes. The
- syntax to exclude nodes in a country with country code XX is
- "ExcludeNodes {XX}". Patch from Robert Hogan. It still needs some
- refinement to decide what config options should take priority if
- you ask to both use a particular node and exclude it.
- - Allow ExitNodes list to include IP ranges and country codes, just
- like the Exclude*Nodes lists. Patch from Robert Hogan.
- o Major bugfixes:
- - Fix a bug when parsing ports in tor_addr_port_parse() that caused
- Tor to fail to start if you had it configured to use a bridge
- relay. Fixes bug 809. Bugfix on 0.2.1.5-alpha.
- - When extending a circuit to a hidden service directory to upload a
- rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
- requests failed, because the router descriptor had not been
- downloaded yet. In these cases, we now wait until the router
- descriptor is downloaded, and then retry. Likewise, clients
- now skip over a hidden service directory if they don't yet have
- its router descriptor, rather than futilely requesting it and
- putting mysterious complaints in the logs. Fixes bug 767. Bugfix
- on 0.2.0.10-alpha.
- - When fetching v0 and v2 rendezvous service descriptors in parallel,
- we were failing the whole hidden service request when the v0
- descriptor fetch fails, even if the v2 fetch is still pending and
- might succeed. Similarly, if the last v2 fetch fails, we were
- failing the whole hidden service request even if a v0 fetch is
- still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
- - DNS replies need to have names matching their requests, but
- these names should be in the questions section, not necessarily
- in the answers section. Fixes bug 823. Bugfix on 0.2.1.5-alpha.
- o Minor features:
- - Update to the "September 1 2008" ip-to-country file.
- - Allow ports 465 and 587 in the default exit policy again. We had
- rejected them in 0.1.0.15, because back in 2005 they were commonly
- misconfigured and ended up as spam targets. We hear they are better
- locked down these days.
- - Use a lockfile to make sure that two Tor processes are not
- simultaneously running with the same datadir.
- - Serve the latest v3 networkstatus consensus via the control
- port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
- - Better logging about stability/reliability calculations on directory
- servers.
- - Drop the requirement to have an open dir port for storing and
- serving v2 hidden service descriptors.
- - Directory authorities now serve a /tor/dbg-stability.txt URL to
- help debug WFU and MTBF calculations.
- - Implement most of Proposal 152: allow specialized servers to permit
- single-hop circuits, and clients to use those servers to build
- single-hop circuits when using a specialized controller. Patch
- from Josh Albrecht. Resolves feature request 768.
- - Add a -p option to tor-resolve for specifying the SOCKS port: some
- people find host:port too confusing.
- - Make TrackHostExit mappings expire a while after their last use, not
- after their creation. Patch from Robert Hogan.
- - Provide circuit purposes along with circuit events to the controller.
- o Minor bugfixes:
- - Fix compile on OpenBSD 4.4-current. Bugfix on 0.2.1.5-alpha.
- Reported by Tas.
- - Fixed some memory leaks -- some quite frequent, some almost
- impossible to trigger -- based on results from Coverity.
- - When testing for libevent functions, set the LDFLAGS variable
- correctly. Found by Riastradh.
- - Fix an assertion bug in parsing policy-related options; possible fix
- for bug 811.
- - Catch and report a few more bootstrapping failure cases when Tor
- fails to establish a TCP connection. Cleanup on 0.2.1.x.
- - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
- bootstrapping with tunneled directory connections. Bugfix on
- 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
- - When asked to connect to A.B.exit:80, if we don't know the IP for A
- and we know that server B rejects most-but-not all connections to
- port 80, we would previously reject the connection. Now, we assume
- the user knows what they were asking for. Fixes bug 752. Bugfix
- on 0.0.9rc5. Diagnosed by BarkerJr.
- - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
- service directories if they have no advertised dir port. Bugfix
- on 0.2.0.10-alpha.
- - If we overrun our per-second write limits a little, count this as
- having used up our write allocation for the second, and choke
- outgoing directory writes. Previously, we had only counted this when
- we had met our limits precisely. Fixes bug 824. Patch by rovv.
- Bugfix on 0.2.0.x (??).
- - Avoid a "0 divided by 0" calculation when calculating router uptime
- at directory authorities. Bugfix on 0.2.0.8-alpha.
- - Make DNS resolved controller events into "CLOSED", not
- "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
- bug 807.
- - Fix a bug where an unreachable relay would establish enough
- reachability testing circuits to do a bandwidth test -- if
- we already have a connection to the middle hop of the testing
- circuit, then it could establish the last hop by using the existing
- connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
- circuits no longer use entry guards in 0.2.1.3-alpha.
- - If we have correct permissions on $datadir, we complain to stdout
- and fail to start. But dangerous permissions on
- $datadir/cached-status/ would cause us to open a log and complain
- there. Now complain to stdout and fail to start in both cases. Fixes
- bug 820, reported by seeess.
- - Remove the old v2 directory authority 'lefkada' from the default
- list. It has been gone for many months.
- o Code simplifications and refactoring:
- - Revise the connection_new functions so that a more typesafe variant
- exists. This will work better with Coverity, and let us find any
- actual mistakes we're making here.
- - Refactor unit testing logic so that dmalloc can be used sensibly
- with unit tests to check for memory leaks.
- - Move all hidden-service related fields from connection and circuit
- structure to substructures: this way they won't eat so much memory.
- Changes in version 0.2.0.31 - 2008-09-03
- Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
- a big bug we're seeing where in rare cases traffic from one Tor stream
- gets mixed into another stream, and fixes a variety of smaller issues.
- o Major bugfixes:
- - Make sure that two circuits can never exist on the same connection
- with the same circuit ID, even if one is marked for close. This
- is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
- - Relays now reject risky extend cells: if the extend cell includes
- a digest of all zeroes, or asks to extend back to the relay that
- sent the extend cell, tear down the circuit. Ideas suggested
- by rovv.
- - If not enough of our entry guards are available so we add a new
- one, we might use the new one even if it overlapped with the
- current circuit's exit relay (or its family). Anonymity bugfix
- pointed out by rovv.
- o Minor bugfixes:
- - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
- 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
- - Correctly detect the presence of the linux/netfilter_ipv4.h header
- when building against recent kernels. Bugfix on 0.1.2.1-alpha.
- - Pick size of default geoip filename string correctly on windows.
- Fixes bug 806. Bugfix on 0.2.0.30.
- - Make the autoconf script accept the obsolete --with-ssl-dir
- option as an alias for the actually-working --with-openssl-dir
- option. Fix the help documentation to recommend --with-openssl-dir.
- Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
- - When using the TransPort option on OpenBSD, and using the User
- option to change UID and drop privileges, make sure to open
- /dev/pf before dropping privileges. Fixes bug 782. Patch from
- Christopher Davis. Bugfix on 0.1.2.1-alpha.
- - Try to attach connections immediately upon receiving a RENDEZVOUS2
- or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
- on the client side when connecting to a hidden service. Bugfix
- on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
- - When closing an application-side connection because its circuit is
- getting torn down, generate the stream event correctly. Bugfix on
- 0.1.2.x. Anonymous patch.
- Changes in version 0.2.1.5-alpha - 2008-08-31
- Tor 0.2.1.5-alpha moves us closer to handling IPv6 destinations, puts
- in a lot of the infrastructure for adding authorization to hidden
- services, lays the groundwork for having clients read their load
- balancing information out of the networkstatus consensus rather than
- the individual router descriptors, addresses two potential anonymity
- issues, and fixes a variety of smaller issues.
- o Major features:
- - Convert many internal address representations to optionally hold
- IPv6 addresses.
- - Generate and accept IPv6 addresses in many protocol elements.
- - Make resolver code handle nameservers located at ipv6 addresses.
- - Begin implementation of proposal 121 ("Client authorization for
- hidden services"): configure hidden services with client
- authorization, publish descriptors for them, and configure
- authorization data for hidden services at clients. The next
- step is to actually access hidden services that perform client
- authorization.
- - More progress toward proposal 141: Network status consensus
- documents and votes now contain bandwidth information for each
- router and a summary of that router's exit policy. Eventually this
- will be used by clients so that they do not have to download every
- known descriptor before building circuits.
- o Major bugfixes (on 0.2.0.x and before):
- - When sending CREATED cells back for a given circuit, use a 64-bit
- connection ID to find the right connection, rather than an addr:port
- combination. Now that we can have multiple OR connections between
- the same ORs, it is no longer possible to use addr:port to uniquely
- identify a connection.
- - Relays now reject risky extend cells: if the extend cell includes
- a digest of all zeroes, or asks to extend back to the relay that
- sent the extend cell, tear down the circuit. Ideas suggested
- by rovv.
- - If not enough of our entry guards are available so we add a new
- one, we might use the new one even if it overlapped with the
- current circuit's exit relay (or its family). Anonymity bugfix
- pointed out by rovv.
- o Minor bugfixes:
- - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
- 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
- - When using the TransPort option on OpenBSD, and using the User
- option to change UID and drop privileges, make sure to open /dev/pf
- before dropping privileges. Fixes bug 782. Patch from Christopher
- Davis. Bugfix on 0.1.2.1-alpha.
- - Correctly detect the presence of the linux/netfilter_ipv4.h header
- when building against recent kernels. Bugfix on 0.1.2.1-alpha.
- - Add a missing safe_str() call for a debug log message.
- - Use 64 bits instead of 32 bits for connection identifiers used with
- the controller protocol, to greatly reduce risk of identifier reuse.
- - Make the autoconf script accept the obsolete --with-ssl-dir
- option as an alias for the actually-working --with-openssl-dir
- option. Fix the help documentation to recommend --with-openssl-dir.
- Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
- o Minor features:
- - Rate-limit too-many-sockets messages: when they happen, they happen
- a lot. Resolves bug 748.
- - Resist DNS poisoning a little better by making sure that names in
- answer sections match.
- - Print the SOCKS5 error message string as well as the error code
- when a tor-resolve request fails. Patch from Jacob.
- Changes in version 0.2.1.4-alpha - 2008-08-04
- Tor 0.2.1.4-alpha fixes a pair of crash bugs in 0.2.1.3-alpha.
- o Major bugfixes:
- - The address part of exit policies was not correctly written
- to router descriptors. This generated router descriptors that failed
- their self-checks. Noticed by phobos, fixed by Karsten. Bugfix
- on 0.2.1.3-alpha.
- - Tor triggered a false assert when extending a circuit to a relay
- but we already have a connection open to that relay. Noticed by
- phobos, fixed by Karsten. Bugfix on 0.2.1.3-alpha.
- o Minor bugfixes:
- - Fix a hidden service logging bug: in some edge cases, the router
- descriptor of a previously picked introduction point becomes
- obsolete and we need to give up on it rather than continually
- complaining that it has become obsolete. Observed by xiando. Bugfix
- on 0.2.1.3-alpha.
- o Removed features:
- - Take out the TestVia config option, since it was a workaround for
- a bug that was fixed in Tor 0.1.1.21.
- Changes in version 0.2.1.3-alpha - 2008-08-03
- Tor 0.2.1.3-alpha implements most of the pieces to prevent
- infinite-length circuit attacks (see proposal 110); fixes a bug that
- might cause exit relays to corrupt streams they send back; allows
- address patterns (e.g. 255.128.0.0/16) to appear in ExcludeNodes and
- ExcludeExitNodes config options; and fixes a big pile of bugs.
- o Bootstrapping bugfixes (on 0.2.1.x-alpha):
- - Send a bootstrap problem "warn" event on the first problem if the
- reason is NO_ROUTE (that is, our network is down).
- o Major features:
- - Implement most of proposal 110: The first K cells to be sent
- along a circuit are marked as special "early" cells; only K "early"
- cells will be allowed. Once this code is universal, we can block
- certain kinds of DOS attack by requiring that EXTEND commands must
- be sent using an "early" cell.
- o Major bugfixes:
- - Try to attach connections immediately upon receiving a RENDEZVOUS2
- or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
- on the client side when connecting to a hidden service. Bugfix
- on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
- - Ensure that two circuits can never exist on the same connection
- with the same circuit ID, even if one is marked for close. This
- is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
- o Minor features:
- - When relays do their initial bandwidth measurement, don't limit
- to just our entry guards for the test circuits. Otherwise we tend
- to have multiple test circuits going through a single entry guard,
- which makes our bandwidth test less accurate. Fixes part of bug 654;
- patch contributed by Josh Albrecht.
- - Add an ExcludeExitNodes option so users can list a set of nodes
- that should be be excluded from the exit node position, but
- allowed elsewhere. Implements proposal 151.
- - Allow address patterns (e.g., 255.128.0.0/16) to appear in
- ExcludeNodes and ExcludeExitNodes lists.
- - Change the implementation of ExcludeNodes and ExcludeExitNodes to
- be more efficient. Formerly it was quadratic in the number of
- servers; now it should be linear. Fixes bug 509.
- - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
- and n_conn_id_digest fields into a separate structure that's
- only needed when the circuit has not yet attached to an n_conn.
- o Minor bugfixes:
- - Change the contrib/tor.logrotate script so it makes the new
- logs as "_tor:_tor" rather than the default, which is generally
- "root:wheel". Fixes bug 676, reported by Serge Koksharov.
- - Stop using __attribute__((nonnull)) with GCC: it can give us useful
- warnings (occasionally), but it can also cause the compiler to
- eliminate error-checking code. Suggested by Peter Gutmann.
- - When a hidden service is giving up on an introduction point candidate
- that was not included in the last published rendezvous descriptor,
- don't reschedule publication of the next descriptor. Fixes bug 763.
- Bugfix on 0.0.9.3.
- - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
- HiddenServiceExcludeNodes as obsolete: they never worked properly,
- and nobody claims to be using them. Fixes bug 754. Bugfix on
- 0.1.0.1-rc. Patch from Christian Wilms.
- - Fix a small alignment and memory-wasting bug on buffer chunks.
- Spotted by rovv.
- o Minor bugfixes (controller):
- - When closing an application-side connection because its circuit
- is getting torn down, generate the stream event correctly.
- Bugfix on 0.1.2.x. Anonymous patch.
- o Removed features:
- - Remove all backward-compatibility code to support relays running
- versions of Tor so old that they no longer work at all on the
- Tor network.
- Changes in version 0.2.0.30 - 2008-07-15
- o Minor bugfixes:
- - Stop using __attribute__((nonnull)) with GCC: it can give us useful
- warnings (occasionally), but it can also cause the compiler to
- eliminate error-checking code. Suggested by Peter Gutmann.
- Changes in version 0.2.0.29-rc - 2008-07-08
- Tor 0.2.0.29-rc fixes two big bugs with using bridges, fixes more
- hidden-service performance bugs, and fixes a bunch of smaller bugs.
- o Major bugfixes:
- - If you have more than one bridge but don't know their keys,
- you would only launch a request for the descriptor of the first one
- on your list. (Tor considered launching requests for the others, but
- found that it already had a connection on the way for $0000...0000
- so it didn't open another.) Bugfix on 0.2.0.x.
- - If you have more than one bridge but don't know their keys, and the
- connection to one of the bridges failed, you would cancel all
- pending bridge connections. (After all, they all have the same
- digest.) Bugfix on 0.2.0.x.
- - When a hidden service was trying to establish an introduction point,
- and Tor had built circuits preemptively for such purposes, we
- were ignoring all the preemptive circuits and launching a new one
- instead. Bugfix on 0.2.0.14-alpha.
- - When a hidden service was trying to establish an introduction point,
- and Tor *did* manage to reuse one of the preemptively built
- circuits, it didn't correctly remember which one it used,
- so it asked for another one soon after, until there were no
- more preemptive circuits, at which point it launched one from
- scratch. Bugfix on 0.0.9.x.
- - Make directory servers include the X-Your-Address-Is: http header in
- their responses even for begin_dir conns. Now clients who only
- ever use begin_dir connections still have a way to learn their IP
- address. Fixes bug 737; bugfix on 0.2.0.22-rc. Reported by goldy.
- o Minor bugfixes:
- - Fix a macro/CPP interaction that was confusing some compilers:
- some GCCs don't like #if/#endif pairs inside macro arguments.
- Fixes bug 707.
- - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
- Fixes bug 704; fix from Steven Murdoch.
- - When opening /dev/null in finish_daemonize(), do not pass the
- O_CREAT flag. Fortify was complaining, and correctly so. Fixes
- bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
- - Correctly detect transparent proxy support on Linux hosts that
- require in.h to be included before netfilter_ipv4.h. Patch
- from coderman.
- - Disallow session resumption attempts during the renegotiation
- stage of the v2 handshake protocol. Clients should never be trying
- session resumption at this point, but apparently some did, in
- ways that caused the handshake to fail. Bugfix on 0.2.0.20-rc. Bug
- found by Geoff Goodell.
- Changes in version 0.2.1.2-alpha - 2008-06-20
- Tor 0.2.1.2-alpha includes a new "TestingTorNetwork" config option to
- make it easier to set up your own private Tor network; fixes several
- big bugs with using more than one bridge relay; fixes a big bug with
- offering hidden services quickly after Tor starts; and uses a better
- API for reporting potential bootstrapping problems to the controller.
- o Major features:
- - New TestingTorNetwork config option to allow adjustment of
- previously constant values that, while reasonable, could slow
- bootstrapping. Implements proposal 135. Patch from Karsten.
- o Major bugfixes:
- - If you have more than one bridge but don't know their digests,
- you would only learn a request for the descriptor of the first one
- on your list. (Tor considered launching requests for the others, but
- found that it already had a connection on the way for $0000...0000
- so it didn't open another.) Bugfix on 0.2.0.x.
- - If you have more than one bridge but don't know their digests,
- and the connection to one of the bridges failed, you would cancel
- all pending bridge connections. (After all, they all have the
- same digest.) Bugfix on 0.2.0.x.
- - When establishing a hidden service, introduction points that
- originate from cannibalized circuits are completely ignored and not
- included in rendezvous service descriptors. This might be another
- reason for delay in making a hidden service available. Bugfix
- from long ago (0.0.9.x?)
- o Minor features:
- - Allow OpenSSL to use dynamic locks if it wants.
- - When building a consensus, do not include routers that are down.
- This will cut down 30% to 40% on consensus size. Implements
- proposal 138.
- - In directory authorities' approved-routers files, allow
- fingerprints with or without space.
- - Add a "GETINFO /status/bootstrap-phase" controller option, so the
- controller can query our current bootstrap state in case it attaches
- partway through and wants to catch up.
- - Send an initial "Starting" bootstrap status event, so we have a
- state to start out in.
- o Minor bugfixes:
- - Asking for a conditional consensus at .../consensus/<fingerprints>
- would crash a dirserver if it did not already have a
- consensus. Bugfix on 0.2.1.1-alpha.
- - Clean up some macro/CPP interactions: some GCC versions don't like
- #if/#endif pairs inside macro arguments. Fixes bug 707. Bugfix on
- 0.2.0.x.
- o Bootstrapping bugfixes (on 0.2.1.1-alpha):
- - Directory authorities shouldn't complain about bootstrapping
- problems just because they do a lot of reachability testing and
- some of the connection attempts fail.
- - Start sending "count" and "recommendation" key/value pairs in
- bootstrap problem status events, so the controller can hear about
- problems even before Tor decides they're worth reporting for sure.
- - If you're using bridges, generate "bootstrap problem" warnings
- as soon as you run out of working bridges, rather than waiting
- for ten failures -- which will never happen if you have less than
- ten bridges.
- - If we close our OR connection because there's been a circuit
- pending on it for too long, we were telling our bootstrap status
- events "REASON=NONE". Now tell them "REASON=TIMEOUT".
- Changes in version 0.2.1.1-alpha - 2008-06-13
- Tor 0.2.1.1-alpha fixes a lot of memory fragmentation problems that
- were making the Tor process bloat especially on Linux; makes our TLS
- handshake blend in better; sends "bootstrap phase" status events to
- the controller, so it can keep the user informed of progress (and
- problems) fetching directory information and establishing circuits;
- and adds a variety of smaller features.
- o Major features:
- - More work on making our TLS handshake blend in: modify the list
- of ciphers advertised by OpenSSL in client mode to even more
- closely resemble a common web browser. We cheat a little so that
- we can advertise ciphers that the locally installed OpenSSL doesn't
- know about.
- - Start sending "bootstrap phase" status events to the controller,
- so it can keep the user informed of progress fetching directory
- information and establishing circuits. Also inform the controller
- if we think we're stuck at a particular bootstrap phase. Implements
- proposal 137.
- - Resume using OpenSSL's RAND_poll() for better (and more portable)
- cross-platform entropy collection again. We used to use it, then
- stopped using it because of a bug that could crash systems that
- called RAND_poll when they had a lot of fds open. It looks like the
- bug got fixed in late 2006. Our new behavior is to call RAND_poll()
- at startup, and to call RAND_poll() when we reseed later only if
- we have a non-buggy OpenSSL version.
- o Major bugfixes:
- - When we choose to abandon a new entry guard because we think our
- older ones might be better, close any circuits pending on that
- new entry guard connection. This fix should make us recover much
- faster when our network is down and then comes back. Bugfix on
- 0.1.2.8-beta; found by lodger.
- o Memory fixes and improvements:
- - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
- to avoid unused RAM in buffer chunks and memory pools.
- - Speed up parsing and cut down on memory fragmentation by using
- stack-style allocations for parsing directory objects. Previously,
- this accounted for over 40% of allocations from within Tor's code
- on a typical directory cache.
- - Use a Bloom filter rather than a digest-based set to track which
- descriptors we need to keep around when we're cleaning out old
- router descriptors. This speeds up the computation significantly,
- and may reduce fragmentation.
- - Reduce the default smartlist size from 32 to 16; it turns out that
- most smartlists hold around 8-12 elements tops.
- - Make dumpstats() log the fullness and size of openssl-internal
- buffers.
- - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
- patch to their OpenSSL, turn it on to save memory on servers. This
- patch will (with any luck) get included in a mainline distribution
- before too long.
- - Never use OpenSSL compression: it wastes RAM and CPU trying to
- compress cells, which are basically all encrypted, compressed,
- or both.
- o Minor bugfixes:
- - Stop reloading the router list from disk for no reason when we
- run out of reachable directory mirrors. Once upon a time reloading
- it would set the 'is_running' flag back to 1 for them. It hasn't
- done that for a long time.
- - In very rare situations new hidden service descriptors were
- published earlier than 30 seconds after the last change to the
- service. (We currently think that a hidden service descriptor
- that's been stable for 30 seconds is worth publishing.)
- o Minor features:
- - Allow separate log levels to be configured for different logging
- domains. For example, this allows one to log all notices, warnings,
- or errors, plus all memory management messages of level debug or
- higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
- - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
- and stop using a warning that had become unfixably verbose under
- GCC 4.3.
- - New --hush command-line option similar to --quiet. While --quiet
- disables all logging to the console on startup, --hush limits the
- output to messages of warning and error severity.
- - Servers support a new URL scheme for consensus downloads that
- allows the client to specify which authorities are trusted.
- The server then only sends the consensus if the client will trust
- it. Otherwise a 404 error is sent back. Clients use this
- new scheme when the server supports it (meaning it's running
- 0.2.1.1-alpha or later). Implements proposal 134.
- - New configure/torrc options (--enable-geoip-stats,
- DirRecordUsageByCountry) to record how many IPs we've served
- directory info to in each country code, how many status documents
- total we've sent to each country code, and what share of the total
- directory requests we should expect to see.
- - Use the TLS1 hostname extension to more closely resemble browser
- behavior.
- - Lots of new unit tests.
- - Add a macro to implement the common pattern of iterating through
- two parallel lists in lockstep.
- Changes in version 0.2.0.28-rc - 2008-06-13
- Tor 0.2.0.28-rc fixes an anonymity-related bug, fixes a hidden-service
- performance bug, and fixes a bunch of smaller bugs.
- o Anonymity fixes:
- - Fix a bug where, when we were choosing the 'end stream reason' to
- put in our relay end cell that we send to the exit relay, Tor
- clients on Windows were sometimes sending the wrong 'reason'. The
- anonymity problem is that exit relays may be able to guess whether
- the client is running Windows, thus helping partition the anonymity
- set. Down the road we should stop sending reasons to exit relays,
- or otherwise prevent future versions of this bug.
- o Major bugfixes:
- - While setting up a hidden service, some valid introduction circuits
- were overlooked and abandoned. This might be the reason for
- the long delay in making a hidden service available. Bugfix on
- 0.2.0.14-alpha.
- o Minor features:
- - Update to the "June 9 2008" ip-to-country file.
- - Run 'make test' as part of 'make dist', so we stop releasing so
- many development snapshots that fail their unit tests.
- o Minor bugfixes:
- - When we're checking if we have enough dir info for each relay
- to begin establishing circuits, make sure that we actually have
- the descriptor listed in the consensus, not just any descriptor.
- Bugfix on 0.1.2.x.
- - Bridge relays no longer print "xx=0" in their extrainfo document
- for every single country code in the geoip db. Bugfix on
- 0.2.0.27-rc.
- - Only warn when we fail to load the geoip file if we were planning to
- include geoip stats in our extrainfo document. Bugfix on 0.2.0.27-rc.
- - If we change our MaxAdvertisedBandwidth and then reload torrc,
- Tor won't realize it should publish a new relay descriptor. Fixes
- bug 688, reported by mfr. Bugfix on 0.1.2.x.
- - When we haven't had any application requests lately, don't bother
- logging that we have expired a bunch of descriptors. Bugfix
- on 0.1.2.x.
- - Make relay cells written on a connection count as non-padding when
- tracking how long a connection has been in use. Bugfix on
- 0.2.0.1-alpha. Spotted by lodger.
- - Fix unit tests in 0.2.0.27-rc.
- - Fix compile on Windows.
- Changes in version 0.2.0.27-rc - 2008-06-03
- Tor 0.2.0.27-rc adds a few features we left out of the earlier
- release candidates. In particular, we now include an IP-to-country
- GeoIP database, so controllers can easily look up what country a
- given relay is in, and so bridge relays can give us some sanitized
- summaries about which countries are making use of bridges. (See proposal
- 126-geoip-fetching.txt for details.)
- o Major features:
- - Include an IP-to-country GeoIP file in the tarball, so bridge
- relays can report sanitized summaries of the usage they're seeing.
- o Minor features:
- - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
- Robert Hogan. Fixes the first part of bug 681.
- - Make bridge authorities never serve extrainfo docs.
- - Add support to detect Libevent versions in the 1.4.x series
- on mingw.
- - Fix build on gcc 4.3 with --enable-gcc-warnings set.
- - Include a new contrib/tor-exit-notice.html file that exit relay
- operators can put on their website to help reduce abuse queries.
- o Minor bugfixes:
- - When tunneling an encrypted directory connection, and its first
- circuit fails, do not leave it unattached and ask the controller
- to deal. Fixes the second part of bug 681.
- - Make bridge authorities correctly expire old extrainfo documents
- from time to time.
- Changes in version 0.2.0.26-rc - 2008-05-13
- Tor 0.2.0.26-rc fixes a major security vulnerability caused by a bug
- in Debian's OpenSSL packages. All users running any 0.2.0.x version
- should upgrade, whether they're running Debian or not.
- o Major security fixes:
- - Use new V3 directory authority keys on the tor26, gabelmoo, and
- moria1 V3 directory authorities. The old keys were generated with
- a vulnerable version of Debian's OpenSSL package, and must be
- considered compromised. Other authorities' keys were not generated
- with an affected version of OpenSSL.
- o Major bugfixes:
- - List authority signatures as "unrecognized" based on DirServer
- lines, not on cert cache. Bugfix on 0.2.0.x.
- o Minor features:
- - Add a new V3AuthUseLegacyKey option to make it easier for
- authorities to change their identity keys if they have to.
- Changes in version 0.2.0.25-rc - 2008-04-23
- Tor 0.2.0.25-rc makes Tor work again on OS X and certain BSDs.
- o Major bugfixes:
- - Remember to initialize threading before initializing logging.
- Otherwise, many BSD-family implementations will crash hard on
- startup. Fixes bug 671. Bugfix on 0.2.0.24-rc.
- o Minor bugfixes:
- - Authorities correctly free policies on bad servers on
- exit. Fixes bug 672. Bugfix on 0.2.0.x.
- Changes in version 0.2.0.24-rc - 2008-04-22
- Tor 0.2.0.24-rc adds dizum (run by Alex de Joode) as the new sixth
- v3 directory authority, makes relays with dynamic IP addresses and no
- DirPort notice more quickly when their IP address changes, fixes a few
- rare crashes and memory leaks, and fixes a few other miscellaneous bugs.
- o New directory authorities:
- - Take lefkada out of the list of v3 directory authorities, since
- it has been down for months.
- - Set up dizum (run by Alex de Joode) as the new sixth v3 directory
- authority.
- o Major bugfixes:
- - Detect address changes more quickly on non-directory mirror
- relays. Bugfix on 0.2.0.18-alpha; fixes bug 652.
- o Minor features (security):
- - Reject requests for reverse-dns lookup of names that are in
- a private address space. Patch from lodger.
- - Non-exit relays no longer allow DNS requests. Fixes bug 619. Patch
- from lodger.
- o Minor bugfixes (crashes):
- - Avoid a rare assert that can trigger when Tor doesn't have much
- directory information yet and it tries to fetch a v2 hidden
- service descriptor. Fixes bug 651, reported by nwf.
- - Initialize log mutex before initializing dmalloc. Otherwise,
- running with dmalloc would crash. Bugfix on 0.2.0.x-alpha.
- - Use recursive pthread mutexes in order to avoid deadlock when
- logging debug-level messages to a controller. Bug spotted by nwf,
- bugfix on 0.2.0.16-alpha.
- o Minor bugfixes (resource management):
- - Keep address policies from leaking memory: start their refcount
- at 1, not 2. Bugfix on 0.2.0.16-alpha.
- - Free authority certificates on exit, so they don't look like memory
- leaks. Bugfix on 0.2.0.19-alpha.
- - Free static hashtables for policy maps and for TLS connections on
- shutdown, so they don't look like memory leaks. Bugfix on 0.2.0.x.
- - Avoid allocating extra space when computing consensuses on 64-bit
- platforms. Bug spotted by aakova.
- o Minor bugfixes (misc):
- - Do not read the configuration file when we've only been told to
- generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
- based on patch from Sebastian Hahn.
- - Exit relays that are used as a client can now reach themselves
- using the .exit notation, rather than just launching an infinite
- pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
- - When attempting to open a logfile fails, tell us why.
- - Fix a dumb bug that was preventing us from knowing that we should
- preemptively build circuits to handle expected directory requests.
- Fixes bug 660. Bugfix on 0.1.2.x.
- - Warn less verbosely about clock skew from netinfo cells from
- untrusted sources. Fixes bug 663.
- - Make controller stream events for DNS requests more consistent,
- by adding "new stream" events for DNS requests, and removing
- spurious "stream closed" events" for cached reverse resolves.
- Patch from mwenge. Fixes bug 646.
- - Correctly notify one-hop connections when a circuit build has
- failed. Possible fix for bug 669. Found by lodger.
- Changes in version 0.2.0.23-rc - 2008-03-24
- Tor 0.2.0.23-rc is the fourth release candidate for the 0.2.0 series. It
- makes bootstrapping faster if the first directory mirror you contact
- is down. The bundles also include the new Vidalia 0.1.2 release.
- o Major bugfixes:
- - When a tunneled directory request is made to a directory server
- that's down, notice after 30 seconds rather than 120 seconds. Also,
- fail any begindir streams that are pending on it, so they can
- retry elsewhere. This was causing multi-minute delays on bootstrap.
- Changes in version 0.2.0.22-rc - 2008-03-18
- Tor 0.2.0.22-rc is the third release candidate for the 0.2.0 series. It
- enables encrypted directory connections by default for non-relays, fixes
- some broken TLS behavior we added in 0.2.0.20-rc, and resolves many
- other bugs. The bundles also include Vidalia 0.1.1 and Torbutton 1.1.17.
- o Major features:
- - Enable encrypted directory connections by default for non-relays,
- so censor tools that block Tor directory connections based on their
- plaintext patterns will no longer work. This means Tor works in
- certain censored countries by default again.
- o Major bugfixes:
- - Make sure servers always request certificates from clients during
- TLS renegotiation. Reported by lodger; bugfix on 0.2.0.20-rc.
- - Do not enter a CPU-eating loop when a connection is closed in
- the middle of client-side TLS renegotiation. Fixes bug 622. Bug
- diagnosed by lodger; bugfix on 0.2.0.20-rc.
- - Fix assertion failure that could occur when a blocked circuit
- became unblocked, and it had pending client DNS requests. Bugfix
- on 0.2.0.1-alpha. Fixes bug 632.
- o Minor bugfixes (on 0.1.2.x):
- - Generate "STATUS_SERVER" events rather than misspelled
- "STATUS_SEVER" events. Caught by mwenge.
- - When counting the number of bytes written on a TLS connection,
- look at the BIO actually used for writing to the network, not
- at the BIO used (sometimes) to buffer data for the network.
- Looking at different BIOs could result in write counts on the
- order of ULONG_MAX. Fixes bug 614.
- - On Windows, correctly detect errors when listing the contents of
- a directory. Fix from lodger.
- o Minor bugfixes (on 0.2.0.x):
- - Downgrade "sslv3 alert handshake failure" message to INFO.
- - If we set RelayBandwidthRate and RelayBandwidthBurst very high but
- left BandwidthRate and BandwidthBurst at the default, we would be
- silently limited by those defaults. Now raise them to match the
- RelayBandwidth* values.
- - Fix the SVK version detection logic to work correctly on a branch.
- - Make --enable-openbsd-malloc work correctly on Linux with alpha
- CPUs. Fixes bug 625.
- - Logging functions now check that the passed severity is sane.
- - Use proper log levels in the testsuite call of
- get_interface_address6().
- - When using a nonstandard malloc, do not use the platform values for
- HAVE_MALLOC_GOOD_SIZE or HAVE_MALLOC_USABLE_SIZE.
- - Make the openbsd malloc code use 8k pages on alpha CPUs and
- 16k pages on ia64.
- - Detect mismatched page sizes when using --enable-openbsd-malloc.
- - Avoid double-marked-for-close warning when certain kinds of invalid
- .in-addr.arpa addresses are passed to the DNSPort. Part of a fix
- for bug 617. Bugfix on 0.2.0.1-alpha.
- - Make sure that the "NULL-means-reject *:*" convention is followed by
- all the policy manipulation functions, avoiding some possible crash
- bugs. Bug found by lodger. Bugfix on 0.2.0.16-alpha.
- - Fix the implementation of ClientDNSRejectInternalAddresses so that it
- actually works, and doesn't warn about every single reverse lookup.
- Fixes the other part of bug 617. Bugfix on 0.2.0.1-alpha.
- o Minor features:
- - Only log guard node status when guard node status has changed.
- - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
- make "INFO" 75% less verbose.
- Changes in version 0.2.0.21-rc - 2008-03-02
- Tor 0.2.0.21-rc is the second release candidate for the 0.2.0 series. It
- makes Tor work well with Vidalia again, fixes a rare assert bug,
- and fixes a pair of more minor bugs. The bundles also include Vidalia
- 0.1.0 and Torbutton 1.1.16.
- o Major bugfixes:
- - The control port should declare that it requires password auth
- when HashedControlSessionPassword is set too. Patch from Matt Edman;
- bugfix on 0.2.0.20-rc. Fixes bug 615.
- - Downgrade assert in connection_buckets_decrement() to a log message.
- This may help us solve bug 614, and in any case will make its
- symptoms less severe. Bugfix on 0.2.0.20-rc. Reported by fredzupy.
- - We were sometimes miscounting the number of bytes read from the
- network, causing our rate limiting to not be followed exactly.
- Bugfix on 0.2.0.16-alpha. Reported by lodger.
- o Minor bugfixes:
- - Fix compilation with OpenSSL 0.9.8 and 0.9.8a. All other supported
- OpenSSL versions should have been working fine. Diagnosis and patch
- from lodger, Karsten Loesing, and Sebastian Hahn. Fixes bug 616.
- Bugfix on 0.2.0.20-rc.
- Changes in version 0.2.0.20-rc - 2008-02-24
- Tor 0.2.0.20-rc is the first release candidate for the 0.2.0 series. It
- makes more progress towards normalizing Tor's TLS handshake, makes
- hidden services work better again, helps relays bootstrap if they don't
- know their IP address, adds optional support for linking in openbsd's
- allocator or tcmalloc, allows really fast relays to scale past 15000
- sockets, and fixes a bunch of minor bugs reported by Veracode.
- o Major features:
- - Enable the revised TLS handshake based on the one designed by
- Steven Murdoch in proposal 124, as revised in proposal 130. It
- includes version negotiation for OR connections as described in
- proposal 105. The new handshake is meant to be harder for censors
- to fingerprint, and it adds the ability to detect certain kinds of
- man-in-the-middle traffic analysis attacks. The version negotiation
- feature will allow us to improve Tor's link protocol more safely
- in the future.
- - Choose which bridge to use proportional to its advertised bandwidth,
- rather than uniformly at random. This should speed up Tor for
- bridge users. Also do this for people who set StrictEntryNodes.
- - When a TrackHostExits-chosen exit fails too many times in a row,
- stop using it. Bugfix on 0.1.2.x; fixes bug 437.
- o Major bugfixes:
- - Resolved problems with (re-)fetching hidden service descriptors.
- Patch from Karsten Loesing; fixes problems with 0.2.0.18-alpha
- and 0.2.0.19-alpha.
- - If we only ever used Tor for hidden service lookups or posts, we
- would stop building circuits and start refusing connections after
- 24 hours, since we falsely believed that Tor was dormant. Reported
- by nwf; bugfix on 0.1.2.x.
- - Servers that don't know their own IP address should go to the
- authorities for their first directory fetch, even if their DirPort
- is off or if they don't know they're reachable yet. This will help
- them bootstrap better. Bugfix on 0.2.0.18-alpha; fixes bug 609.
- - When counting the number of open sockets, count not only the number
- of sockets we have received from the socket() call, but also
- the number we've gotten from accept() and socketpair(). This bug
- made us fail to count all sockets that we were using for incoming
- connections. Bugfix on 0.2.0.x.
- - Fix code used to find strings within buffers, when those strings
- are not in the first chunk of the buffer. Bugfix on 0.2.0.x.
- - Fix potential segfault when parsing HTTP headers. Bugfix on 0.2.0.x.
- - Add a new __HashedControlSessionPassword option for controllers
- to use for one-off session password hashes that shouldn't get
- saved to disk by SAVECONF --- Vidalia users were accumulating a
- pile of HashedControlPassword lines in their torrc files, one for
- each time they had restarted Tor and then clicked Save. Make Tor
- automatically convert "HashedControlPassword" to this new option but
- only when it's given on the command line. Partial fix for bug 586.
- o Minor features (performance):
- - Tune parameters for cell pool allocation to minimize amount of
- RAM overhead used.
- - Add OpenBSD malloc code from phk as an optional malloc
- replacement on Linux: some glibc libraries do very poorly
- with Tor's memory allocation patterns. Pass
- --enable-openbsd-malloc to get the replacement malloc code.
- - Add a --with-tcmalloc option to the configure script to link
- against tcmalloc (if present). Does not yet search for
- non-system include paths.
- - Stop imposing an arbitrary maximum on the number of file descriptors
- used for busy servers. Bug reported by Olaf Selke; patch from
- Sebastian Hahn.
- o Minor features (other):
- - When SafeLogging is disabled, log addresses along with all TLS
- errors.
- - When building with --enable-gcc-warnings, check for whether Apple's
- warning "-Wshorten-64-to-32" is available.
- - Add a --passphrase-fd argument to the tor-gencert command for
- scriptability.
- o Minor bugfixes (memory leaks and code problems):
- - We were leaking a file descriptor if Tor started with a zero-length
- cached-descriptors file. Patch by freddy77; bugfix on 0.1.2.
- - Detect size overflow in zlib code. Reported by Justin Ferguson and
- Dan Kaminsky.
- - We were comparing the raw BridgePassword entry with a base64'ed
- version of it, when handling a "/tor/networkstatus-bridges"
- directory request. Now compare correctly. Noticed by Veracode.
- - Recover from bad tracked-since value in MTBF-history file.
- Should fix bug 537.
- - Alter the code that tries to recover from unhandled write
- errors, to not try to flush onto a socket that's given us
- unhandled errors. Bugfix on 0.1.2.x.
- - Make Unix controlsockets work correctly on OpenBSD. Patch from
- tup. Bugfix on 0.2.0.3-alpha.
- o Minor bugfixes (other):
- - If we have an extra-info document for our server, always make
- it available on the control port, even if we haven't gotten
- a copy of it from an authority yet. Patch from mwenge.
- - Log the correct memory chunk sizes for empty RAM chunks in mempool.c.
- - Directory mirrors no longer include a guess at the client's IP
- address if the connection appears to be coming from the same /24
- network; it was producing too many wrong guesses.
- - Make the new hidden service code respect the SafeLogging setting.
- Bugfix on 0.2.0.x. Patch from Karsten.
- - When starting as an authority, do not overwrite all certificates
- cached from other authorities. Bugfix on 0.2.0.x. Fixes bug 606.
- - If we're trying to flush the last bytes on a connection (for
- example, when answering a directory request), reset the
- time-to-give-up timeout every time we manage to write something
- on the socket. Bugfix on 0.1.2.x.
- - Change the behavior of "getinfo status/good-server-descriptor"
- so it doesn't return failure when any authority disappears.
- - Even though the man page said that "TrackHostExits ." should
- work, nobody had ever implemented it. Bugfix on 0.1.0.x.
- - Report TLS "zero return" case as a "clean close" and "IO error"
- as a "close". Stop calling closes "unexpected closes": existing
- Tors don't use SSL_close(), so having a connection close without
- the TLS shutdown handshake is hardly unexpected.
- - Send NAMESERVER_STATUS messages for a single failed nameserver
- correctly.
- o Code simplifications and refactoring:
- - Remove the tor_strpartition function: its logic was confused,
- and it was only used for one thing that could be implemented far
- more easily.
- Changes in version 0.2.0.19-alpha - 2008-02-09
- Tor 0.2.0.19-alpha makes more progress towards normalizing Tor's TLS
- handshake, makes path selection for relays more secure and IP address
- guessing more robust, and generally fixes a lot of bugs in preparation
- for calling the 0.2.0 branch stable.
- o Major features:
- - Do not include recognizeable strings in the commonname part of
- Tor's x509 certificates.
- o Major bugfixes:
- - If we're a relay, avoid picking ourselves as an introduction point,
- a rendezvous point, or as the final hop for internal circuits. Bug
- reported by taranis and lodger. Bugfix on 0.1.2.x.
- - Patch from "Andrew S. Lists" to catch when we contact a directory
- mirror at IP address X and he says we look like we're coming from
- IP address X. Bugfix on 0.1.2.x.
- o Minor features (security):
- - Be more paranoid about overwriting sensitive memory on free(),
- as a defensive programming tactic to ensure forward secrecy.
- o Minor features (directory authority):
- - Actually validate the options passed to AuthDirReject,
- AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
- - Reject router descriptors with out-of-range bandwidthcapacity or
- bandwidthburst values.
- o Minor features (controller):
- - Reject controller commands over 1MB in length. This keeps rogue
- processes from running us out of memory.
- o Minor features (misc):
- - Give more descriptive well-formedness errors for out-of-range
- hidden service descriptor/protocol versions.
- - Make memory debugging information describe more about history
- of cell allocation, so we can help reduce our memory use.
- o Deprecated features (controller):
- - The status/version/num-versioning and status/version/num-concurring
- GETINFO options are no longer useful in the v3 directory protocol:
- treat them as deprecated, and warn when they're used.
- o Minor bugfixes:
- - When our consensus networkstatus has been expired for a while, stop
- being willing to build circuits using it. Fixes bug 401. Bugfix
- on 0.1.2.x.
- - Directory caches now fetch certificates from all authorities
- listed in a networkstatus consensus, even when they do not
- recognize them. Fixes bug 571. Bugfix on 0.2.0.x.
- - When connecting to a bridge without specifying its key, insert
- the connection into the identity-to-connection map as soon as
- a key is learned. Fixes bug 574. Bugfix on 0.2.0.x.
- - Detect versions of OS X where malloc_good_size() is present in the
- library but never actually declared. Resolves bug 587. Bugfix
- on 0.2.0.x.
- - Stop incorrectly truncating zlib responses to directory authority
- signature download requests. Fixes bug 593. Bugfix on 0.2.0.x.
- - Stop recommending that every server operator send mail to tor-ops.
- Resolves bug 597. Bugfix on 0.1.2.x.
- - Don't trigger an assert if we start a directory authority with a
- private IP address (like 127.0.0.1).
- - Avoid possible failures when generating a directory with routers
- with over-long versions strings, or too many flags set. Bugfix
- on 0.1.2.x.
- - If an attempt to launch a DNS resolve request over the control
- port fails because we have overrun the limit on the number of
- connections, tell the controller that the request has failed.
- - Avoid using too little bandwidth when our clock skips a few
- seconds. Bugfix on 0.1.2.x.
- - Fix shell error when warning about missing packages in configure
- script, on Fedora or Red Hat machines. Bugfix on 0.2.0.x.
- - Do not become confused when receiving a spurious VERSIONS-like
- cell from a confused v1 client. Bugfix on 0.2.0.x.
- - Re-fetch v2 (as well as v0) rendezvous descriptors when all
- introduction points for a hidden service have failed. Patch from
- Karsten Loesing. Bugfix on 0.2.0.x.
- o Code simplifications and refactoring:
- - Remove some needless generality from cpuworker code, for improved
- type-safety.
- - Stop overloading the circuit_t.onionskin field for both "onionskin
- from a CREATE cell that we are waiting for a cpuworker to be
- assigned" and "onionskin from an EXTEND cell that we are going to
- send to an OR as soon as we are connected". Might help with bug 600.
- - Add an in-place version of aes_crypt() so that we can avoid doing a
- needless memcpy() call on each cell payload.
- Changes in version 0.2.0.18-alpha - 2008-01-25
- Tor 0.2.0.18-alpha adds a sixth v3 directory authority run by CCC,
- fixes a big memory leak in 0.2.0.17-alpha, and adds new config options
- that can warn or reject connections to ports generally associated with
- vulnerable-plaintext protocols.
- o New directory authorities:
- - Set up dannenberg (run by CCC) as the sixth v3 directory
- authority.
- o Major bugfixes:
- - Fix a major memory leak when attempting to use the v2 TLS
- handshake code. Bugfix on 0.2.0.x; fixes bug 589.
- - We accidentally enabled the under-development v2 TLS handshake
- code, which was causing log entries like "TLS error while
- renegotiating handshake". Disable it again. Resolves bug 590.
- - We were computing the wrong Content-Length: header for directory
- responses that need to be compressed on the fly, causing clients
- asking for those items to always fail. Bugfix on 0.2.0.x; partially
- fixes bug 593.
- o Major features:
- - Avoid going directly to the directory authorities even if you're a
- relay, if you haven't found yourself reachable yet or if you've
- decided not to advertise your dirport yet. Addresses bug 556.
- - If we've gone 12 hours since our last bandwidth check, and we
- estimate we have less than 50KB bandwidth capacity but we could
- handle more, do another bandwidth test.
- - New config options WarnPlaintextPorts and RejectPlaintextPorts so
- Tor can warn and/or refuse connections to ports commonly used with
- vulnerable-plaintext protocols. Currently we warn on ports 23,
- 109, 110, and 143, but we don't reject any.
- o Minor bugfixes:
- - When we setconf ClientOnly to 1, close any current OR and Dir
- listeners. Reported by mwenge.
- - When we get a consensus that's been signed by more people than
- we expect, don't log about it; it's not a big deal. Reported
- by Kyle Williams.
- o Minor features:
- - Don't answer "/tor/networkstatus-bridges" directory requests if
- the request isn't encrypted.
- - Make "ClientOnly 1" config option disable directory ports too.
- - Patches from Karsten Loesing to make v2 hidden services more
- robust: work even when there aren't enough HSDir relays available;
- retry when a v2 rend desc fetch fails; but don't retry if we
- already have a usable v0 rend desc.
- Changes in version 0.2.0.17-alpha - 2008-01-17
- Tor 0.2.0.17-alpha makes the tarball build cleanly again (whoops).
- o Compile fixes:
- - Make the tor-gencert man page get included correctly in the tarball.
- Changes in version 0.2.0.16-alpha - 2008-01-17
- Tor 0.2.0.16-alpha adds a fifth v3 directory authority run by Karsten
- Loesing, and generally cleans up a lot of features and minor bugs.
- o New directory authorities:
- - Set up gabelmoo (run by Karsten Loesing) as the fifth v3 directory
- authority.
- o Major performance improvements:
- - Switch our old ring buffer implementation for one more like that
- used by free Unix kernels. The wasted space in a buffer with 1mb
- of data will now be more like 8k than 1mb. The new implementation
- also avoids realloc();realloc(); patterns that can contribute to
- memory fragmentation.
- o Minor features:
- - Configuration files now accept C-style strings as values. This
- helps encode characters not allowed in the current configuration
- file format, such as newline or #. Addresses bug 557.
- - Although we fixed bug 539 (where servers would send HTTP status 503
- responses _and_ send a body too), there are still servers out
- there that haven't upgraded. Therefore, make clients parse such
- bodies when they receive them.
- - When we're not serving v2 directory information, there is no reason
- to actually keep any around. Remove the obsolete files and directory
- on startup if they are very old and we aren't going to serve them.
- o Minor performance improvements:
- - Reference-count and share copies of address policy entries; only 5%
- of them were actually distinct.
- - Never walk through the list of logs if we know that no log is
- interested in a given message.
- o Minor bugfixes:
- - When an authority has not signed a consensus, do not try to
- download a nonexistent "certificate with key 00000000". Bugfix
- on 0.2.0.x. Fixes bug 569.
- - Fix a rare assert error when we're closing one of our threads:
- use a mutex to protect the list of logs, so we never write to the
- list as it's being freed. Bugfix on 0.1.2.x. Fixes the very rare
- bug 575, which is kind of the revenge of bug 222.
- - Patch from Karsten Loesing to complain less at both the client
- and the relay when a relay used to have the HSDir flag but doesn't
- anymore, and we try to upload a hidden service descriptor.
- - Stop leaking one cert per TLS context. Fixes bug 582. Bugfix on
- 0.2.0.15-alpha.
- - Do not try to download missing certificates until we have tried
- to check our fallback consensus. Fixes bug 583.
- - Make bridges round reported GeoIP stats info up to the nearest
- estimate, not down. Now we can distinguish between "0 people from
- this country" and "1 person from this country".
- - Avoid a spurious free on base64 failure. Bugfix on 0.1.2.
- - Avoid possible segfault if key generation fails in
- crypto_pk_hybrid_encrypt. Bugfix on 0.2.0.
- - Avoid segfault in the case where a badly behaved v2 versioning
- directory sends a signed networkstatus with missing client-versions.
- Bugfix on 0.1.2.
- - Avoid segfaults on certain complex invocations of
- router_get_by_hexdigest(). Bugfix on 0.1.2.
- - Correct bad index on array access in parse_http_time(). Bugfix
- on 0.2.0.
- - Fix possible bug in vote generation when server versions are present
- but client versions are not.
- - Fix rare bug on REDIRECTSTREAM control command when called with no
- port set: it could erroneously report an error when none had
- happened.
- - Avoid bogus crash-prone, leak-prone tor_realloc when we're
- compressing large objects and find ourselves with more than 4k
- left over. Bugfix on 0.2.0.
- - Fix a small memory leak when setting up a hidden service.
- - Fix a few memory leaks that could in theory happen under bizarre
- error conditions.
- - Fix an assert if we post a general-purpose descriptor via the
- control port but that descriptor isn't mentioned in our current
- network consensus. Bug reported by Jon McLachlan; bugfix on
- 0.2.0.9-alpha.
- o Minor features (controller):
- - Get NS events working again. Patch from tup.
- - The GETCONF command now escapes and quotes configuration values
- that don't otherwise fit into the torrc file.
- - The SETCONF command now handles quoted values correctly.
- o Minor features (directory authorities):
- - New configuration options to override default maximum number of
- servers allowed on a single IP address. This is important for
- running a test network on a single host.
- - Actually implement the -s option to tor-gencert.
- - Add a manual page for tor-gencert.
- o Minor features (bridges):
- - Bridge authorities no longer serve bridge descriptors over
- unencrypted connections.
- o Minor features (other):
- - Add hidden services and DNSPorts to the list of things that make
- Tor accept that it has running ports. Change starting Tor with no
- ports from a fatal error to a warning; we might change it back if
- this turns out to confuse anybody. Fixes bug 579.
- Changes in version 0.1.2.19 - 2008-01-17
- Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
- exit policy a little bit more conservative so it's safer to run an
- exit relay on a home system, and fixes a variety of smaller issues.
- o Security fixes:
- - Exit policies now reject connections that are addressed to a
- relay's public (external) IP address too, unless
- ExitPolicyRejectPrivate is turned off. We do this because too
- many relays are running nearby to services that trust them based
- on network address.
- o Major bugfixes:
- - When the clock jumps forward a lot, do not allow the bandwidth
- buckets to become negative. Fixes bug 544.
- - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
- on every successful resolve. Reported by Mike Perry.
- - Purge old entries from the "rephist" database and the hidden
- service descriptor database even when DirPort is zero.
- - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
- requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
- crashing or mis-answering these requests.
- - When we decide to send a 503 response to a request for servers, do
- not then also send the server descriptors: this defeats the whole
- purpose. Fixes bug 539.
- o Minor bugfixes:
- - Changing the ExitPolicyRejectPrivate setting should cause us to
- rebuild our server descriptor.
- - Fix handling of hex nicknames when answering controller requests for
- networkstatus by name, or when deciding whether to warn about
- unknown routers in a config option. (Patch from mwenge.)
- - Fix a couple of hard-to-trigger autoconf problems that could result
- in really weird results on platforms whose sys/types.h files define
- nonstandard integer types.
- - Don't try to create the datadir when running --verify-config or
- --hash-password. Resolves bug 540.
- - If we were having problems getting a particular descriptor from the
- directory caches, and then we learned about a new descriptor for
- that router, we weren't resetting our failure count. Reported
- by lodger.
- - Although we fixed bug 539 (where servers would send HTTP status 503
- responses _and_ send a body too), there are still servers out there
- that haven't upgraded. Therefore, make clients parse such bodies
- when they receive them.
- - Run correctly on systems where rlim_t is larger than unsigned long.
- This includes some 64-bit systems.
- - Run correctly on platforms (like some versions of OS X 10.5) where
- the real limit for number of open files is OPEN_FILES, not rlim_max
- from getrlimit(RLIMIT_NOFILES).
- - Avoid a spurious free on base64 failure.
- - Avoid segfaults on certain complex invocations of
- router_get_by_hexdigest().
- - Fix rare bug on REDIRECTSTREAM control command when called with no
- port set: it could erroneously report an error when none had
- happened.
- Changes in version 0.2.0.15-alpha - 2007-12-25
- Tor 0.2.0.14-alpha and 0.2.0.15-alpha fix a bunch of bugs with the
- features added in 0.2.0.13-alpha.
- o Major bugfixes:
- - Fix several remotely triggerable asserts based on DirPort requests
- for a v2 or v3 networkstatus object before we were prepared. This
- was particularly bad for 0.2.0.13 and later bridge relays, who
- would never have a v2 networkstatus and would thus always crash
- when used. Bugfixes on 0.2.0.x.
- - Estimate the v3 networkstatus size more accurately, rather than
- estimating it at zero bytes and giving it artificially high priority
- compared to other directory requests. Bugfix on 0.2.0.x.
- o Minor bugfixes:
- - Fix configure.in logic for cross-compilation.
- - When we load a bridge descriptor from the cache, and it was
- previously unreachable, mark it as retriable so we won't just
- ignore it. Also, try fetching a new copy immediately. Bugfixes
- on 0.2.0.13-alpha.
- - The bridge GeoIP stats were counting other relays, for example
- self-reachability and authority-reachability tests.
- o Minor features:
- - Support compilation to target iPhone; patch from cjacker huang.
- To build for iPhone, pass the --enable-iphone option to configure.
- Changes in version 0.2.0.14-alpha - 2007-12-23
- o Major bugfixes:
- - Fix a crash on startup if you install Tor 0.2.0.13-alpha fresh
- without a datadirectory from a previous Tor install. Reported
- by Zax.
- - Fix a crash when we fetch a descriptor that turns out to be
- unexpected (it used to be in our networkstatus when we started
- fetching it, but it isn't in our current networkstatus), and we
- aren't using bridges. Bugfix on 0.2.0.x.
- - Fix a crash when accessing hidden services: it would work the first
- time you use a given introduction point for your service, but
- on subsequent requests we'd be using garbage memory. Fixed by
- Karsten Loesing. Bugfix on 0.2.0.13-alpha.
- - Fix a crash when we load a bridge descriptor from disk but we don't
- currently have a Bridge line for it in our torrc. Bugfix on
- 0.2.0.13-alpha.
- o Major features:
- - If bridge authorities set BridgePassword, they will serve a
- snapshot of known bridge routerstatuses from their DirPort to
- anybody who knows that password. Unset by default.
- o Minor bugfixes:
- - Make the unit tests build again.
- - Make "GETINFO/desc-annotations/id/<OR digest>" actually work.
- - Make PublishServerDescriptor default to 1, so the default doesn't
- have to change as we invent new directory protocol versions.
- - Fix test for rlim_t on OSX 10.3: sys/resource.h doesn't want to
- be included unless sys/time.h is already included. Fixes
- bug 553. Bugfix on 0.2.0.x.
- - If we receive a general-purpose descriptor and then receive an
- identical bridge-purpose descriptor soon after, don't discard
- the next one as a duplicate.
- o Minor features:
- - If BridgeRelay is set to 1, then the default for
- PublishServerDescriptor is now "bridge" rather than "v2,v3".
- - If the user sets RelayBandwidthRate but doesn't set
- RelayBandwidthBurst, then make them equal rather than erroring out.
- Changes in version 0.2.0.13-alpha - 2007-12-21
- Tor 0.2.0.13-alpha adds a fourth v3 directory authority run by Geoff
- Goodell, fixes many more bugs, and adds a lot of infrastructure for
- upcoming features.
- o New directory authorities:
- - Set up lefkada (run by Geoff Goodell) as the fourth v3 directory
- authority.
- o Major bugfixes:
- - Only update guard status (usable / not usable) once we have
- enough directory information. This was causing us to always pick
- two new guards on startup (bugfix on 0.2.0.9-alpha), and it was
- causing us to discard all our guards on startup if we hadn't been
- running for a few weeks (bugfix on 0.1.2.x). Fixes bug 448.
- - Purge old entries from the "rephist" database and the hidden
- service descriptor databases even when DirPort is zero. Bugfix
- on 0.1.2.x.
- - We were ignoring our RelayBandwidthRate for the first 30 seconds
- after opening a circuit -- even a relayed circuit. Bugfix on
- 0.2.0.3-alpha.
- - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
- requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
- crashing or mis-answering these types of requests.
- - Relays were publishing their server descriptor to v1 and v2
- directory authorities, but they didn't try publishing to v3-only
- authorities. Fix this; and also stop publishing to v1 authorities.
- Bugfix on 0.2.0.x.
- - When we were reading router descriptors from cache, we were ignoring
- the annotations -- so for example we were reading in bridge-purpose
- descriptors as general-purpose descriptors. Bugfix on 0.2.0.8-alpha.
- - When we decided to send a 503 response to a request for servers, we
- were then also sending the server descriptors: this defeats the
- whole purpose. Fixes bug 539; bugfix on 0.1.2.x.
- o Major features:
- - Bridge relays now behave like clients with respect to time
- intervals for downloading new consensus documents -- otherwise they
- stand out. Bridge users now wait until the end of the interval,
- so their bridge relay will be sure to have a new consensus document.
- - Three new config options (AlternateDirAuthority,
- AlternateBridgeAuthority, and AlternateHSAuthority) that let the
- user selectively replace the default directory authorities by type,
- rather than the all-or-nothing replacement that DirServer offers.
- - Tor can now be configured to read a GeoIP file from disk in one
- of two formats. This can be used by controllers to map IP addresses
- to countries. Eventually, it may support exit-by-country.
- - When possible, bridge relays remember which countries users
- are coming from, and report aggregate information in their
- extra-info documents, so that the bridge authorities can learn
- where Tor is blocked.
- - Bridge directory authorities now do reachability testing on the
- bridges they know. They provide router status summaries to the
- controller via "getinfo ns/purpose/bridge", and also dump summaries
- to a file periodically.
- - Stop fetching directory info so aggressively if your DirPort is
- on but your ORPort is off; stop fetching v2 dir info entirely.
- You can override these choices with the new FetchDirInfoEarly
- config option.
- o Minor bugfixes:
- - The fix in 0.2.0.12-alpha cleared the "hsdir" flag in v3 network
- consensus documents when there are too many relays at a single
- IP address. Now clear it in v2 network status documents too, and
- also clear it in routerinfo_t when the relay is no longer listed
- in the relevant networkstatus document.
- - Don't crash if we get an unexpected value for the
- PublishServerDescriptor config option. Reported by Matt Edman;
- bugfix on 0.2.0.9-alpha.
- - Our new v2 hidden service descriptor format allows descriptors
- that have no introduction points. But Tor crashed when we tried
- to build a descriptor with no intro points (and it would have
- crashed if we had tried to parse one). Bugfix on 0.2.0.x; patch
- by Karsten Loesing.
- - Fix building with dmalloc 5.5.2 with glibc.
- - Reject uploaded descriptors and extrainfo documents if they're
- huge. Otherwise we'll cache them all over the network and it'll
- clog everything up. Reported by Aljosha Judmayer.
- - Check for presence of s6_addr16 and s6_addr32 fields in in6_addr
- via autoconf. Should fix compile on solaris. Bugfix on 0.2.0.x.
- - When the DANGEROUS_VERSION controller status event told us we're
- running an obsolete version, it used the string "OLD" to describe
- it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
- "OBSOLETE" in both cases. Bugfix on 0.1.2.x.
- - If we can't expand our list of entry guards (e.g. because we're
- using bridges or we have StrictEntryNodes set), don't mark relays
- down when they fail a directory request. Otherwise we're too quick
- to mark all our entry points down. Bugfix on 0.1.2.x.
- - Fix handling of hex nicknames when answering controller requests for
- networkstatus by name, or when deciding whether to warn about unknown
- routers in a config option. Bugfix on 0.1.2.x. (Patch from mwenge.)
- - Fix a couple of hard-to-trigger autoconf problems that could result
- in really weird results on platforms whose sys/types.h files define
- nonstandard integer types. Bugfix on 0.1.2.x.
- - Fix compilation with --disable-threads set. Bugfix on 0.2.0.x.
- - Don't crash on name lookup when we have no current consensus. Fixes
- bug 538; bugfix on 0.2.0.x.
- - Only Tors that want to mirror the v2 directory info should
- create the "cached-status" directory in their datadir. (All Tors
- used to create it.) Bugfix on 0.2.0.9-alpha.
- - Directory authorities should only automatically download Extra Info
- documents if they're v1, v2, or v3 authorities. Bugfix on 0.1.2.x.
- o Minor features:
- - On the USR1 signal, when dmalloc is in use, log the top 10 memory
- consumers. (We already do this on HUP.)
- - Authorities and caches fetch the v2 networkstatus documents
- less often, now that v3 is encouraged.
- - Add a new config option BridgeRelay that specifies you want to
- be a bridge relay. Right now the only difference is that it makes
- you answer begin_dir requests, and it makes you cache dir info,
- even if your DirPort isn't on.
- - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
- ask about source, timestamp of arrival, purpose, etc. We need
- something like this to help Vidalia not do GeoIP lookups on bridge
- addresses.
- - Allow multiple HashedControlPassword config lines, to support
- multiple controller passwords.
- - Authorities now decide whether they're authoritative for a given
- router based on the router's purpose.
- - New config options AuthDirBadDir and AuthDirListBadDirs for
- authorities to mark certain relays as "bad directories" in the
- networkstatus documents. Also supports the "!baddir" directive in
- the approved-routers file.
- Changes in version 0.2.0.12-alpha - 2007-11-16
- This twelfth development snapshot fixes some more build problems as
- well as a few minor bugs.
- o Compile fixes:
- - Make it build on OpenBSD again. Patch from tup.
- - Substitute BINDIR and LOCALSTATEDIR in scripts. Fixes
- package-building for Red Hat, OS X, etc.
- o Minor bugfixes (on 0.1.2.x):
- - Changing the ExitPolicyRejectPrivate setting should cause us to
- rebuild our server descriptor.
- o Minor bugfixes (on 0.2.0.x):
- - When we're lacking a consensus, don't try to perform rendezvous
- operations. Reported by Karsten Loesing.
- - Fix a small memory leak whenever we decide against using a
- newly picked entry guard. Reported by Mike Perry.
- - When authorities detected more than two relays running on the same
- IP address, they were clearing all the status flags but forgetting
- to clear the "hsdir" flag. So clients were being told that a
- given relay was the right choice for a v2 hsdir lookup, yet they
- never had its descriptor because it was marked as 'not running'
- in the consensus.
- - If we're trying to fetch a bridge descriptor and there's no way
- the bridge authority could help us (for example, we don't know
- a digest, or there is no bridge authority), don't be so eager to
- fall back to asking the bridge authority.
- - If we're using bridges or have strictentrynodes set, and our
- chosen exit is in the same family as all our bridges/entry guards,
- then be flexible about families.
- o Minor features:
- - When we negotiate a v2 link-layer connection (not yet implemented),
- accept RELAY_EARLY cells and turn them into RELAY cells if we've
- negotiated a v1 connection for their next step. Initial code for
- proposal 110.
- Changes in version 0.2.0.11-alpha - 2007-11-12
- This eleventh development snapshot fixes some build problems with
- the previous snapshot. It also includes a more secure-by-default exit
- policy for relays, fixes an enormous memory leak for exit relays, and
- fixes another bug where servers were falling out of the directory list.
- o Security fixes:
- - Exit policies now reject connections that are addressed to a
- relay's public (external) IP address too, unless
- ExitPolicyRejectPrivate is turned off. We do this because too
- many relays are running nearby to services that trust them based
- on network address. Bugfix on 0.1.2.x.
- o Major bugfixes:
- - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
- on every successful resolve. Reported by Mike Perry; bugfix
- on 0.1.2.x.
- - On authorities, never downgrade to old router descriptors simply
- because they're listed in the consensus. This created a catch-22
- where we wouldn't list a new descriptor because there was an
- old one in the consensus, and we couldn't get the new one in the
- consensus because we wouldn't list it. Possible fix for bug 548.
- Also, this might cause bug 543 to appear on authorities; if so,
- we'll need a band-aid for that. Bugfix on 0.2.0.9-alpha.
- o Packaging fixes on 0.2.0.10-alpha:
- - We were including instructions about what to do with the
- src/config/fallback-consensus file, but we weren't actually
- including it in the tarball. Disable all of that for now.
- o Minor features:
- - Allow people to say PreferTunnelledDirConns rather than
- PreferTunneledDirConns, for those alternate-spellers out there.
- o Minor bugfixes:
- - Don't reevaluate all the information from our consensus document
- just because we've downloaded a v2 networkstatus that we intend
- to cache. Fixes bug 545; bugfix on 0.2.0.x.
- Changes in version 0.2.0.10-alpha - 2007-11-10
- This tenth development snapshot adds a third v3 directory authority
- run by Mike Perry, adds most of Karsten Loesing's new hidden service
- descriptor format, fixes a bad crash bug and new bridge bugs introduced
- in 0.2.0.9-alpha, fixes many bugs with the v3 directory implementation,
- fixes some minor memory leaks in previous 0.2.0.x snapshots, and
- addresses many more minor issues.
- o New directory authorities:
- - Set up ides (run by Mike Perry) as the third v3 directory authority.
- o Major features:
- - Allow tunnelled directory connections to ask for an encrypted
- "begin_dir" connection or an anonymized "uses a full Tor circuit"
- connection independently. Now we can make anonymized begin_dir
- connections for (e.g.) more secure hidden service posting and
- fetching.
- - More progress on proposal 114: code from Karsten Loesing to
- implement new hidden service descriptor format.
- - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
- accommodate the growing number of servers that use the default
- and are reaching it.
- - Directory authorities use a new formula for selecting which nodes
- to advertise as Guards: they must be in the top 7/8 in terms of
- how long we have known about them, and above the median of those
- nodes in terms of weighted fractional uptime.
- - Make "not enough dir info yet" warnings describe *why* Tor feels
- it doesn't have enough directory info yet.
- o Major bugfixes:
- - Stop servers from crashing if they set a Family option (or
- maybe in other situations too). Bugfix on 0.2.0.9-alpha; reported
- by Fabian Keil.
- - Make bridge users work again -- the move to v3 directories in
- 0.2.0.9-alpha had introduced a number of bugs that made bridges
- no longer work for clients.
- - When the clock jumps forward a lot, do not allow the bandwidth
- buckets to become negative. Bugfix on 0.1.2.x; fixes bug 544.
- o Major bugfixes (v3 dir, bugfixes on 0.2.0.9-alpha):
- - When the consensus lists a router descriptor that we previously were
- mirroring, but that we considered non-canonical, reload the
- descriptor as canonical. This fixes bug 543 where Tor servers
- would start complaining after a few days that they don't have
- enough directory information to build a circuit.
- - Consider replacing the current consensus when certificates arrive
- that make the pending consensus valid. Previously, we were only
- considering replacement when the new certs _didn't_ help.
- - Fix an assert error on startup if we didn't already have the
- consensus and certs cached in our datadirectory: we were caching
- the consensus in consensus_waiting_for_certs but then free'ing it
- right after.
- - Avoid sending a request for "keys/fp" (for which we'll get a 400 Bad
- Request) if we need more v3 certs but we've already got pending
- requests for all of them.
- - Correctly back off from failing certificate downloads. Fixes
- bug 546.
- - Authorities don't vote on the Running flag if they have been running
- for less than 30 minutes themselves. Fixes bug 547, where a newly
- started authority would vote that everyone was down.
- o New requirements:
- - Drop support for OpenSSL version 0.9.6. Just about nobody was using
- it, it had no AES, and it hasn't seen any security patches since
- 2004.
- o Minor features:
- - Clients now hold circuitless TLS connections open for 1.5 times
- MaxCircuitDirtiness (15 minutes), since it is likely that they'll
- rebuild a new circuit over them within that timeframe. Previously,
- they held them open only for KeepalivePeriod (5 minutes).
- - Use "If-Modified-Since" to avoid retrieving consensus
- networkstatuses that we already have.
- - When we have no consensus, check FallbackNetworkstatusFile (defaults
- to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
- we start knowing some directory caches.
- - When we receive a consensus from the future, warn about skew.
- - Improve skew reporting: try to give the user a better log message
- about how skewed they are, and how much this matters.
- - When we have a certificate for an authority, believe that
- certificate's claims about the authority's IP address.
- - New --quiet command-line option to suppress the default console log.
- Good in combination with --hash-password.
- - Authorities send back an X-Descriptor-Not-New header in response to
- an accepted-but-discarded descriptor upload. Partially implements
- fix for bug 535.
- - Make the log message for "tls error. breaking." more useful.
- - Better log messages about certificate downloads, to attempt to
- track down the second incarnation of bug 546.
- o Minor features (bridges):
- - If bridge users set UpdateBridgesFromAuthority, but the digest
- they ask for is a 404 from the bridge authority, they now fall
- back to trying the bridge directly.
- - Bridges now use begin_dir to publish their server descriptor to
- the bridge authority, even when they haven't set TunnelDirConns.
- o Minor features (controller):
- - When reporting clock skew, and we know that the clock is _at least
- as skewed_ as some value, but we don't know the actual value,
- report the value as a "minimum skew."
- o Utilities:
- - Update linux-tor-prio.sh script to allow QoS based on the uid of
- the Tor process. Patch from Marco Bonetti with tweaks from Mike
- Perry.
- o Minor bugfixes:
- - Refuse to start if both ORPort and UseBridges are set. Bugfix
- on 0.2.0.x, suggested by Matt Edman.
- - Don't stop fetching descriptors when FetchUselessDescriptors is
- set, even if we stop asking for circuits. Bugfix on 0.1.2.x;
- reported by tup and ioerror.
- - Better log message on vote from unknown authority.
- - Don't log "Launching 0 request for 0 router" message.
- o Minor bugfixes (memory leaks):
- - Stop leaking memory every time we parse a v3 certificate. Bugfix
- on 0.2.0.1-alpha.
- - Stop leaking memory every time we load a v3 certificate. Bugfix
- on 0.2.0.1-alpha. Fixes bug 536.
- - Stop leaking a cached networkstatus on exit. Bugfix on
- 0.2.0.3-alpha.
- - Stop leaking voter information every time we free a consensus.
- Bugfix on 0.2.0.3-alpha.
- - Stop leaking signed data every time we check a voter signature.
- Bugfix on 0.2.0.3-alpha.
- - Stop leaking a signature every time we fail to parse a consensus or
- a vote. Bugfix on 0.2.0.3-alpha.
- - Stop leaking v2_download_status_map on shutdown. Bugfix on
- 0.2.0.9-alpha.
- - Stop leaking conn->nickname every time we make a connection to a
- Tor relay without knowing its expected identity digest (e.g. when
- using bridges). Bugfix on 0.2.0.3-alpha.
- - Minor bugfixes (portability):
- - Run correctly on platforms where rlim_t is larger than unsigned
- long, and/or where the real limit for number of open files is
- OPEN_FILES, not rlim_max from getrlimit(RLIMIT_NOFILES). In
- particular, these may be needed for OS X 10.5.
- Changes in version 0.1.2.18 - 2007-10-28
- Tor 0.1.2.18 fixes many problems including crash bugs, problems with
- hidden service introduction that were causing huge delays, and a big
- bug that was causing some servers to disappear from the network status
- lists for a few hours each day.
- o Major bugfixes (crashes):
- - If a connection is shut down abruptly because of something that
- happened inside connection_flushed_some(), do not call
- connection_finished_flushing(). Should fix bug 451:
- "connection_stop_writing: Assertion conn->write_event failed"
- Bugfix on 0.1.2.7-alpha.
- - Fix possible segfaults in functions called from
- rend_process_relay_cell().
- o Major bugfixes (hidden services):
- - Hidden services were choosing introduction points uniquely by
- hexdigest, but when constructing the hidden service descriptor
- they merely wrote the (potentially ambiguous) nickname.
- - Clients now use the v2 intro format for hidden service
- connections: they specify their chosen rendezvous point by identity
- digest rather than by (potentially ambiguous) nickname. These
- changes could speed up hidden service connections dramatically.
- o Major bugfixes (other):
- - Stop publishing a new server descriptor just because we get a
- HUP signal. This led (in a roundabout way) to some servers getting
- dropped from the networkstatus lists for a few hours each day.
- - When looking for a circuit to cannibalize, consider family as well
- as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
- circuit cannibalization).
- - When a router wasn't listed in a new networkstatus, we were leaving
- the flags for that router alone -- meaning it remained Named,
- Running, etc -- even though absence from the networkstatus means
- that it shouldn't be considered to exist at all anymore. Now we
- clear all the flags for routers that fall out of the networkstatus
- consensus. Fixes bug 529.
- o Minor bugfixes:
- - Don't try to access (or alter) the state file when running
- --list-fingerprint or --verify-config or --hash-password. Resolves
- bug 499.
- - When generating information telling us how to extend to a given
- router, do not try to include the nickname if it is
- absent. Resolves bug 467.
- - Fix a user-triggerable segfault in expand_filename(). (There isn't
- a way to trigger this remotely.)
- - When sending a status event to the controller telling it that an
- OR address is reachable, set the port correctly. (Previously we
- were reporting the dir port.)
- - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
- command. Bugfix on 0.1.2.17.
- - When loading bandwidth history, do not believe any information in
- the future. Fixes bug 434.
- - When loading entry guard information, do not believe any information
- in the future.
- - When we have our clock set far in the future and generate an
- onion key, then re-set our clock to be correct, we should not stop
- the onion key from getting rotated.
- - On some platforms, accept() can return a broken address. Detect
- this more quietly, and deal accordingly. Fixes bug 483.
- - It's not actually an error to find a non-pending entry in the DNS
- cache when canceling a pending resolve. Don't log unless stuff
- is fishy. Resolves bug 463.
- - Don't reset trusted dir server list when we set a configuration
- option. Patch from Robert Hogan.
- - Don't try to create the datadir when running --verify-config or
- --hash-password. Resolves bug 540.
- Changes in version 0.2.0.9-alpha - 2007-10-24
- This ninth development snapshot switches clients to the new v3 directory
- system; allows servers to be listed in the network status even when they
- have the same nickname as a registered server; and fixes many other
- bugs including a big one that was causing some servers to disappear
- from the network status lists for a few hours each day.
- o Major features (directory system):
- - Clients now download v3 consensus networkstatus documents instead
- of v2 networkstatus documents. Clients and caches now base their
- opinions about routers on these consensus documents. Clients only
- download router descriptors listed in the consensus.
- - Authorities now list servers who have the same nickname as
- a different named server, but list them with a new flag,
- "Unnamed". Now we can list servers that happen to pick the same
- nickname as a server that registered two years ago and then
- disappeared. Partially implements proposal 122.
- - If the consensus lists a router as "Unnamed", the name is assigned
- to a different router: do not identify the router by that name.
- Partially implements proposal 122.
- - Authorities can now come to a consensus on which method to use to
- compute the consensus. This gives us forward compatibility.
- o Major bugfixes:
- - Stop publishing a new server descriptor just because we HUP or
- when we find our DirPort to be reachable but won't actually publish
- it. New descriptors without any real changes are dropped by the
- authorities, and can screw up our "publish every 18 hours" schedule.
- Bugfix on 0.1.2.x.
- - When a router wasn't listed in a new networkstatus, we were leaving
- the flags for that router alone -- meaning it remained Named,
- Running, etc -- even though absence from the networkstatus means
- that it shouldn't be considered to exist at all anymore. Now we
- clear all the flags for routers that fall out of the networkstatus
- consensus. Fixes bug 529; bugfix on 0.1.2.x.
- - Fix awful behavior in DownloadExtraInfo option where we'd fetch
- extrainfo documents and then discard them immediately for not
- matching the latest router. Bugfix on 0.2.0.1-alpha.
- o Minor features (v3 directory protocol):
- - Allow tor-gencert to generate a new certificate without replacing
- the signing key.
- - Allow certificates to include an address.
- - When we change our directory-cache settings, reschedule all voting
- and download operations.
- - Reattempt certificate downloads immediately on failure, as long as
- we haven't failed a threshold number of times yet.
- - Delay retrying consensus downloads while we're downloading
- certificates to verify the one we just got. Also, count getting a
- consensus that we already have (or one that isn't valid) as a failure,
- and count failing to get the certificates after 20 minutes as a
- failure.
- - Build circuits and download descriptors even if our consensus is a
- little expired. (This feature will go away once authorities are
- more reliable.)
- o Minor features (router descriptor cache):
- - If we find a cached-routers file that's been sitting around for more
- than 28 days unmodified, then most likely it's a leftover from
- when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
- routers anyway.
- - When we (as a cache) download a descriptor because it was listed
- in a consensus, remember when the consensus was supposed to expire,
- and don't expire the descriptor until then.
- o Minor features (performance):
- - Call routerlist_remove_old_routers() much less often. This should
- speed startup, especially on directory caches.
- - Don't try to launch new descriptor downloads quite so often when we
- already have enough directory information to build circuits.
- - Base64 decoding was actually showing up on our profile when parsing
- the initial descriptor file; switch to an in-process all-at-once
- implementation that's about 3.5x times faster than calling out to
- OpenSSL.
- o Minor features (compilation):
- - Detect non-ASCII platforms (if any still exist) and refuse to
- build there: some of our code assumes that 'A' is 65 and so on.
- o Minor bugfixes (v3 directory authorities, bugfixes on 0.2.0.x):
- - Make the "next period" votes into "current period" votes immediately
- after publishing the consensus; avoid a heisenbug that made them
- stick around indefinitely.
- - When we discard a vote as a duplicate, do not report this as
- an error.
- - Treat missing v3 keys or certificates as an error when running as a
- v3 directory authority.
- - When we're configured to be a v3 authority, but we're only listed
- as a non-v3 authority in our DirServer line for ourself, correct
- the listing.
- - If an authority doesn't have a qualified hostname, just put
- its address in the vote. This fixes the problem where we referred to
- "moria on moria:9031."
- - Distinguish between detached signatures for the wrong period, and
- detached signatures for a divergent vote.
- - Fix a small memory leak when computing a consensus.
- - When there's no consensus, we were forming a vote every 30
- minutes, but writing the "valid-after" line in our vote based
- on our configured V3AuthVotingInterval: so unless the intervals
- matched up, we immediately rejected our own vote because it didn't
- start at the voting interval that caused us to construct a vote.
- o Minor bugfixes (v3 directory protocol, bugfixes on 0.2.0.x):
- - Delete unverified-consensus when the real consensus is set.
- - Consider retrying a consensus networkstatus fetch immediately
- after one fails: don't wait 60 seconds to notice.
- - When fetching a consensus as a cache, wait until a newer consensus
- should exist before trying to replace the current one.
- - Use a more forgiving schedule for retrying failed consensus
- downloads than for other types.
- o Minor bugfixes (other directory issues):
- - Correct the implementation of "download votes by digest." Bugfix on
- 0.2.0.8-alpha.
- - Authorities no longer send back "400 you're unreachable please fix
- it" errors to Tor servers that aren't online all the time. We're
- supposed to tolerate these servers now. Bugfix on 0.1.2.x.
- o Minor bugfixes (controller):
- - Don't reset trusted dir server list when we set a configuration
- option. Patch from Robert Hogan; bugfix on 0.1.2.x.
- - Respond to INT and TERM SIGNAL commands before we execute the
- signal, in case the signal shuts us down. We had a patch in
- 0.1.2.1-alpha that tried to do this by queueing the response on
- the connection's buffer before shutting down, but that really
- isn't the same thing at all. Bug located by Matt Edman.
- o Minor bugfixes (misc):
- - Correctly check for bad options to the "PublishServerDescriptor"
- config option. Bugfix on 0.2.0.1-alpha; reported by Matt Edman.
- - Stop leaking memory on failing case of base32_decode, and make
- it accept upper-case letters. Bugfixes on 0.2.0.7-alpha.
- - Don't try to download extrainfo documents when we're trying to
- fetch enough directory info to build a circuit: having enough
- info should get priority. Bugfix on 0.2.0.x.
- - Don't complain that "your server has not managed to confirm that its
- ports are reachable" if we haven't been able to build any circuits
- yet. Bug found by spending four hours without a v3 consensus. Bugfix
- on 0.1.2.x.
- - Detect the reason for failing to mmap a descriptor file we just
- wrote, and give a more useful log message. Fixes bug 533. Bugfix
- on 0.1.2.x.
- o Code simplifications and refactoring:
- - Remove support for the old bw_accounting file: we've been storing
- bandwidth accounting information in the state file since
- 0.1.2.5-alpha. This may result in bandwidth accounting errors
- if you try to upgrade from 0.1.1.x or earlier, or if you try to
- downgrade to 0.1.1.x or earlier.
- - New convenience code to locate a file within the DataDirectory.
- - Move non-authority functionality out of dirvote.c.
- - Refactor the arguments for router_pick_{directory_|trusteddir}server
- so that they all take the same named flags.
- o Utilities
- - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
- Unix users an easy way to script their Tor process (e.g. by
- adjusting bandwidth based on the time of the day).
- Changes in version 0.2.0.8-alpha - 2007-10-12
- This eighth development snapshot fixes a crash bug that's been bothering
- us since February 2007, lets bridge authorities store a list of bridge
- descriptors they've seen, gets v3 directory voting closer to working,
- starts caching v3 directory consensus documents on directory mirrors,
- and fixes a variety of smaller issues including some minor memory leaks.
- o Major features (router descriptor cache):
- - Store routers in a file called cached-descriptors instead of in
- cached-routers. Initialize cached-descriptors from cached-routers
- if the old format is around. The new format allows us to store
- annotations along with descriptors.
- - Use annotations to record the time we received each descriptor, its
- source, and its purpose.
- - Disable the SETROUTERPURPOSE controller command: it is now
- obsolete.
- - Controllers should now specify cache=no or cache=yes when using
- the +POSTDESCRIPTOR command.
- - Bridge authorities now write bridge descriptors to disk, meaning
- we can export them to other programs and begin distributing them
- to blocked users.
- o Major features (directory authorities):
- - When a v3 authority is missing votes or signatures, it now tries
- to fetch them.
- - Directory authorities track weighted fractional uptime as well as
- weighted mean-time-between failures. WFU is suitable for deciding
- whether a node is "usually up", while MTBF is suitable for deciding
- whether a node is "likely to stay up." We need both, because
- "usually up" is a good requirement for guards, while "likely to
- stay up" is a good requirement for long-lived connections.
- o Major features (v3 directory system):
- - Caches now download v3 network status documents as needed,
- and download the descriptors listed in them.
- - All hosts now attempt to download and keep fresh v3 authority
- certificates, and re-attempt after failures.
- - More internal-consistency checks for vote parsing.
- o Major bugfixes (crashes):
- - If a connection is shut down abruptly because of something that
- happened inside connection_flushed_some(), do not call
- connection_finished_flushing(). Should fix bug 451. Bugfix on
- 0.1.2.7-alpha.
- o Major bugfixes (performance):
- - Fix really bad O(n^2) performance when parsing a long list of
- routers: Instead of searching the entire list for an "extra-info "
- string which usually wasn't there, once for every routerinfo
- we read, just scan lines forward until we find one we like.
- Bugfix on 0.2.0.1.
- - When we add data to a write buffer in response to the data on that
- write buffer getting low because of a flush, do not consider the
- newly added data as a candidate for immediate flushing, but rather
- make it wait until the next round of writing. Otherwise, we flush
- and refill recursively, and a single greedy TLS connection can
- eat all of our bandwidth. Bugfix on 0.1.2.7-alpha.
- o Minor features (v3 authority system):
- - Add more ways for tools to download the votes that lead to the
- current consensus.
- - Send a 503 when low on bandwidth and a vote, consensus, or
- certificate is requested.
- - If-modified-since is now implemented properly for all kinds of
- certificate requests.
- o Minor bugfixes (network statuses):
- - Tweak the implementation of proposal 109 slightly: allow at most
- two Tor servers on the same IP address, except if it's the location
- of a directory authority, in which case allow five. Bugfix on
- 0.2.0.3-alpha.
- o Minor bugfixes (controller):
- - When sending a status event to the controller telling it that an
- OR address is reachable, set the port correctly. (Previously we
- were reporting the dir port.) Bugfix on 0.1.2.x.
- o Minor bugfixes (v3 directory system):
- - Fix logic to look up a cert by its signing key digest. Bugfix on
- 0.2.0.7-alpha.
- - Only change the reply to a vote to "OK" if it's not already
- set. This gets rid of annoying "400 OK" log messages, which may
- have been masking some deeper issue. Bugfix on 0.2.0.7-alpha.
- - When we get a valid consensus, recompute the voting schedule.
- - Base the valid-after time of a vote on the consensus voting
- schedule, not on our preferred schedule.
- - Make the return values and messages from signature uploads and
- downloads more sensible.
- - Fix a memory leak when serving votes and consensus documents, and
- another when serving certificates.
- o Minor bugfixes (performance):
- - Use a slightly simpler string hashing algorithm (copying Python's
- instead of Java's) and optimize our digest hashing algorithm to take
- advantage of 64-bit platforms and to remove some possibly-costly
- voodoo.
- - Fix a minor memory leak whenever we parse guards from our state
- file. Bugfix on 0.2.0.7-alpha.
- - Fix a minor memory leak whenever we write out a file. Bugfix on
- 0.2.0.7-alpha.
- - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
- command. Bugfix on 0.2.0.5-alpha.
- o Minor bugfixes (portability):
- - On some platforms, accept() can return a broken address. Detect
- this more quietly, and deal accordingly. Fixes bug 483.
- - Stop calling tor_strlower() on uninitialized memory in some cases.
- Bugfix in 0.2.0.7-alpha.
- o Minor bugfixes (usability):
- - Treat some 403 responses from directory servers as INFO rather than
- WARN-severity events.
- - It's not actually an error to find a non-pending entry in the DNS
- cache when canceling a pending resolve. Don't log unless stuff is
- fishy. Resolves bug 463.
- o Minor bugfixes (anonymity):
- - Never report that we've used more bandwidth than we're willing to
- relay: it leaks how much non-relay traffic we're using. Resolves
- bug 516.
- - When looking for a circuit to cannibalize, consider family as well
- as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
- circuit cannibalization).
- o Code simplifications and refactoring:
- - Make a bunch of functions static. Remove some dead code.
- - Pull out about a third of the really big routerlist.c; put it in a
- new module, networkstatus.c.
- - Merge the extra fields in local_routerstatus_t back into
- routerstatus_t: we used to need one routerstatus_t for each
- authority's opinion, plus a local_routerstatus_t for the locally
- computed consensus opinion. To save space, we put the locally
- modified fields into local_routerstatus_t, and only the common
- stuff into routerstatus_t. But once v3 directories are in use,
- clients and caches will no longer need to hold authority opinions;
- thus, the rationale for keeping the types separate is now gone.
- - Make the code used to reschedule and reattempt downloads more
- uniform.
- - Turn all 'Are we a directory server/mirror?' logic into a call to
- dirserver_mode().
- - Remove the code to generate the oldest (v1) directory format.
- The code has been disabled since 0.2.0.5-alpha.
- Changes in version 0.2.0.7-alpha - 2007-09-21
- This seventh development snapshot makes bridges work again, makes bridge
- authorities work for the first time, fixes two huge performance flaws
- in hidden services, and fixes a variety of minor issues.
- o New directory authorities:
- - Set up moria1 and tor26 as the first v3 directory authorities. See
- doc/spec/dir-spec.txt for details on the new directory design.
- o Major bugfixes (crashes):
- - Fix possible segfaults in functions called from
- rend_process_relay_cell(). Bugfix on 0.1.2.x.
- o Major bugfixes (bridges):
- - Fix a bug that made servers send a "404 Not found" in response to
- attempts to fetch their server descriptor. This caused Tor servers
- to take many minutes to establish reachability for their DirPort,
- and it totally crippled bridges. Bugfix on 0.2.0.5-alpha.
- - Make "UpdateBridgesFromAuthority" torrc option work: when bridge
- users configure that and specify a bridge with an identity
- fingerprint, now they will lookup the bridge descriptor at the
- default bridge authority via a one-hop tunnel, but once circuits
- are established they will switch to a three-hop tunnel for later
- connections to the bridge authority. Bugfix in 0.2.0.3-alpha.
- o Major bugfixes (hidden services):
- - Hidden services were choosing introduction points uniquely by
- hexdigest, but when constructing the hidden service descriptor
- they merely wrote the (potentially ambiguous) nickname.
- - Clients now use the v2 intro format for hidden service
- connections: they specify their chosen rendezvous point by identity
- digest rather than by (potentially ambiguous) nickname. Both
- are bugfixes on 0.1.2.x, and they could speed up hidden service
- connections dramatically. Thanks to Karsten Loesing.
- o Minor features (security):
- - As a client, do not believe any server that tells us that an
- address maps to an internal address space.
- - Make it possible to enable HashedControlPassword and
- CookieAuthentication at the same time.
- o Minor features (guard nodes):
- - Tag every guard node in our state file with the version that
- we believe added it, or with our own version if we add it. This way,
- if a user temporarily runs an old version of Tor and then switches
- back to a new one, she doesn't automatically lose her guards.
- o Minor features (speed):
- - When implementing AES counter mode, update only the portions of the
- counter buffer that need to change, and don't keep separate
- network-order and host-order counters when they are the same (i.e.,
- on big-endian hosts.)
- o Minor features (controller):
- - Accept LF instead of CRLF on controller, since some software has a
- hard time generating real Internet newlines.
- - Add GETINFO values for the server status events
- "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
- Robert Hogan.
- o Removed features:
- - Routers no longer include bandwidth-history lines in their
- descriptors; this information is already available in extra-info
- documents, and including it in router descriptors took up 60%
- (!) of compressed router descriptor downloads. Completes
- implementation of proposal 104.
- - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
- and TorControl.py, as they use the old v0 controller protocol,
- and are obsoleted by TorFlow anyway.
- - Drop support for v1 rendezvous descriptors, since we never used
- them anyway, and the code has probably rotted by now. Based on
- patch from Karsten Loesing.
- - On OSX, stop warning the user that kqueue support in libevent is
- "experimental", since it seems to have worked fine for ages.
- o Minor bugfixes:
- - When generating information telling us how to extend to a given
- router, do not try to include the nickname if it is absent. Fixes
- bug 467. Bugfix on 0.2.0.3-alpha.
- - Fix a user-triggerable (but not remotely-triggerable) segfault
- in expand_filename(). Bugfix on 0.1.2.x.
- - Fix a memory leak when freeing incomplete requests from DNSPort.
- Found by Niels Provos with valgrind. Bugfix on 0.2.0.1-alpha.
- - Don't try to access (or alter) the state file when running
- --list-fingerprint or --verify-config or --hash-password. (Resolves
- bug 499.) Bugfix on 0.1.2.x.
- - Servers used to decline to publish their DirPort if their
- BandwidthRate, RelayBandwidthRate, or MaxAdvertisedBandwidth
- were below a threshold. Now they only look at BandwidthRate and
- RelayBandwidthRate. Bugfix on 0.1.2.x.
- - Remove an optimization in the AES counter-mode code that assumed
- that the counter never exceeded 2^68. When the counter can be set
- arbitrarily as an IV (as it is by Karsten's new hidden services
- code), this assumption no longer holds. Bugfix on 0.1.2.x.
- - Resume listing "AUTHORITY" flag for authorities in network status.
- Bugfix on 0.2.0.3-alpha; reported by Alex de Joode.
- o Code simplifications and refactoring:
- - Revamp file-writing logic so we don't need to have the entire
- contents of a file in memory at once before we write to disk. Tor,
- meet stdio.
- - Turn "descriptor store" into a full-fledged type.
- - Move all NT services code into a separate source file.
- - Unify all code that computes medians, percentile elements, etc.
- - Get rid of a needless malloc when parsing address policies.
- Changes in version 0.1.2.17 - 2007-08-30
- Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
- X bundles. Vidalia 0.0.14 makes authentication required for the
- ControlPort in the default configuration, which addresses important
- security risks. Everybody who uses Vidalia (or another controller)
- should upgrade.
- In addition, this Tor update fixes major load balancing problems with
- path selection, which should speed things up a lot once many people
- have upgraded.
- o Major bugfixes (security):
- - We removed support for the old (v0) control protocol. It has been
- deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
- become more of a headache than it's worth.
- o Major bugfixes (load balancing):
- - When choosing nodes for non-guard positions, weight guards
- proportionally less, since they already have enough load. Patch
- from Mike Perry.
- - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
- will allow fast Tor servers to get more attention.
- - When we're upgrading from an old Tor version, forget our current
- guards and pick new ones according to the new weightings. These
- three load balancing patches could raise effective network capacity
- by a factor of four. Thanks to Mike Perry for measurements.
- o Major bugfixes (stream expiration):
- - Expire not-yet-successful application streams in all cases if
- they've been around longer than SocksTimeout. Right now there are
- some cases where the stream will live forever, demanding a new
- circuit every 15 seconds. Fixes bug 454; reported by lodger.
- o Minor features (controller):
- - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
- is valid before any authentication has been received. It tells
- a controller what kind of authentication is expected, and what
- protocol is spoken. Implements proposal 119.
- o Minor bugfixes (performance):
- - Save on most routerlist_assert_ok() calls in routerlist.c, thus
- greatly speeding up loading cached-routers from disk on startup.
- - Disable sentinel-based debugging for buffer code: we squashed all
- the bugs that this was supposed to detect a long time ago, and now
- its only effect is to change our buffer sizes from nice powers of
- two (which platform mallocs tend to like) to values slightly over
- powers of two (which make some platform mallocs sad).
- o Minor bugfixes (misc):
- - If exit bandwidth ever exceeds one third of total bandwidth, then
- use the correct formula to weight exit nodes when choosing paths.
- Based on patch from Mike Perry.
- - Choose perfectly fairly among routers when choosing by bandwidth and
- weighting by fraction of bandwidth provided by exits. Previously, we
- would choose with only approximate fairness, and correct ourselves
- if we ran off the end of the list.
- - If we require CookieAuthentication but we fail to write the
- cookie file, we would warn but not exit, and end up in a state
- where no controller could authenticate. Now we exit.
- - If we require CookieAuthentication, stop generating a new cookie
- every time we change any piece of our config.
- - Refuse to start with certain directory authority keys, and
- encourage people using them to stop.
- - Terminate multi-line control events properly. Original patch
- from tup.
- - Fix a minor memory leak when we fail to find enough suitable
- servers to choose a circuit.
- - Stop leaking part of the descriptor when we run into a particularly
- unparseable piece of it.
- Changes in version 0.2.0.6-alpha - 2007-08-26
- This sixth development snapshot features a new Vidalia version in the
- Windows and OS X bundles. Vidalia 0.0.14 makes authentication required for
- the ControlPort in the default configuration, which addresses important
- security risks.
- In addition, this snapshot fixes major load balancing problems
- with path selection, which should speed things up a lot once many
- people have upgraded. The directory authorities also use a new
- mean-time-between-failure approach to tracking which servers are stable,
- rather than just looking at the most recent uptime.
- o New directory authorities:
- - Set up Tonga as the default bridge directory authority.
- o Major features:
- - Directory authorities now track servers by weighted
- mean-times-between-failures. When we have 4 or more days of data,
- use measured MTBF rather than declared uptime to decide whether
- to call a router Stable. Implements proposal 108.
- o Major bugfixes (load balancing):
- - When choosing nodes for non-guard positions, weight guards
- proportionally less, since they already have enough load. Patch
- from Mike Perry.
- - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
- will allow fast Tor servers to get more attention.
- - When we're upgrading from an old Tor version, forget our current
- guards and pick new ones according to the new weightings. These
- three load balancing patches could raise effective network capacity
- by a factor of four. Thanks to Mike Perry for measurements.
- o Major bugfixes (descriptor parsing):
- - Handle unexpected whitespace better in malformed descriptors. Bug
- found using Benedikt Boss's new Tor fuzzer! Bugfix on 0.2.0.x.
- o Minor features:
- - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
- GETINFO for Torstat to use until it can switch to using extrainfos.
- - Optionally (if built with -DEXPORTMALLINFO) export the output
- of mallinfo via http, as tor/mallinfo.txt. Only accessible
- from localhost.
- o Minor bugfixes:
- - Do not intermix bridge routers with controller-added
- routers. (Bugfix on 0.2.0.x)
- - Do not fail with an assert when accept() returns an unexpected
- address family. Addresses but does not wholly fix bug 483. (Bugfix
- on 0.2.0.x)
- - Let directory authorities startup even when they can't generate
- a descriptor immediately, e.g. because they don't know their
- address.
- - Stop putting the authentication cookie in a file called "0"
- in your working directory if you don't specify anything for the
- new CookieAuthFile option. Reported by Matt Edman.
- - Make it possible to read the PROTOCOLINFO response in a way that
- conforms to our control-spec. Reported by Matt Edman.
- - Fix a minor memory leak when we fail to find enough suitable
- servers to choose a circuit. Bugfix on 0.1.2.x.
- - Stop leaking part of the descriptor when we run into a particularly
- unparseable piece of it. Bugfix on 0.1.2.x.
- - Unmap the extrainfo cache file on exit.
- Changes in version 0.2.0.5-alpha - 2007-08-19
- This fifth development snapshot fixes compilation on Windows again;
- fixes an obnoxious client-side bug that slowed things down and put
- extra load on the network; gets us closer to using the v3 directory
- voting scheme; makes it easier for Tor controllers to use cookie-based
- authentication; and fixes a variety of other bugs.
- o Removed features:
- - Version 1 directories are no longer generated in full. Instead,
- authorities generate and serve "stub" v1 directories that list
- no servers. This will stop Tor versions 0.1.0.x and earlier from
- working, but (for security reasons) nobody should be running those
- versions anyway.
- o Major bugfixes (compilation, 0.2.0.x):
- - Try to fix Win32 compilation again: improve checking for IPv6 types.
- - Try to fix MSVC compilation: build correctly on platforms that do
- not define s6_addr16 or s6_addr32.
- - Fix compile on platforms without getaddrinfo: bug found by Li-Hui
- Zhou.
- o Major bugfixes (stream expiration):
- - Expire not-yet-successful application streams in all cases if
- they've been around longer than SocksTimeout. Right now there are
- some cases where the stream will live forever, demanding a new
- circuit every 15 seconds. Bugfix on 0.1.2.7-alpha; fixes bug 454;
- reported by lodger.
- o Minor features (directory servers):
- - When somebody requests a list of statuses or servers, and we have
- none of those, return a 404 rather than an empty 200.
- o Minor features (directory voting):
- - Store v3 consensus status consensuses on disk, and reload them
- on startup.
- o Minor features (security):
- - Warn about unsafe ControlPort configurations.
- - Refuse to start with certain directory authority keys, and
- encourage people using them to stop.
- o Minor features (controller):
- - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
- is valid before any authentication has been received. It tells
- a controller what kind of authentication is expected, and what
- protocol is spoken. Implements proposal 119.
- - New config option CookieAuthFile to choose a new location for the
- cookie authentication file, and config option
- CookieAuthFileGroupReadable to make it group-readable.
- o Minor features (unit testing):
- - Add command-line arguments to unit-test executable so that we can
- invoke any chosen test from the command line rather than having
- to run the whole test suite at once; and so that we can turn on
- logging for the unit tests.
- o Minor bugfixes (on 0.1.2.x):
- - If we require CookieAuthentication but we fail to write the
- cookie file, we would warn but not exit, and end up in a state
- where no controller could authenticate. Now we exit.
- - If we require CookieAuthentication, stop generating a new cookie
- every time we change any piece of our config.
- - When loading bandwidth history, do not believe any information in
- the future. Fixes bug 434.
- - When loading entry guard information, do not believe any information
- in the future.
- - When we have our clock set far in the future and generate an
- onion key, then re-set our clock to be correct, we should not stop
- the onion key from getting rotated.
- - Clean up torrc sample config file.
- - Do not automatically run configure from autogen.sh. This
- non-standard behavior tended to annoy people who have built other
- programs.
- o Minor bugfixes (on 0.2.0.x):
- - Fix a bug with AutomapHostsOnResolve that would always cause
- the second request to fail. Bug reported by Kate. Bugfix on
- 0.2.0.3-alpha.
- - Fix a bug in ADDRMAP controller replies that would sometimes
- try to print a NULL. Patch from tup.
- - Read v3 directory authority keys from the right location.
- - Numerous bugfixes to directory voting code.
- Changes in version 0.1.2.16 - 2007-08-01
- Tor 0.1.2.16 fixes a critical security vulnerability that allows a
- remote attacker in certain situations to rewrite the user's torrc
- configuration file. This can completely compromise anonymity of users
- in most configurations, including those running the Vidalia bundles,
- TorK, etc. Or worse.
- o Major security fixes:
- - Close immediately after missing authentication on control port;
- do not allow multiple authentication attempts.
- Changes in version 0.2.0.4-alpha - 2007-08-01
- This fourth development snapshot fixes a critical security vulnerability
- for most users, specifically those running Vidalia, TorK, etc. Everybody
- should upgrade to either 0.1.2.16 or 0.2.0.4-alpha.
- o Major security fixes:
- - Close immediately after missing authentication on control port;
- do not allow multiple authentication attempts.
- o Major bugfixes (compilation):
- - Fix win32 compilation: apparently IN_ADDR and IN6_ADDR are already
- defined there.
- o Minor features (performance):
- - Be even more aggressive about releasing RAM from small
- empty buffers. Thanks to our free-list code, this shouldn't be too
- performance-intensive.
- - Disable sentinel-based debugging for buffer code: we squashed all
- the bugs that this was supposed to detect a long time ago, and
- now its only effect is to change our buffer sizes from nice
- powers of two (which platform mallocs tend to like) to values
- slightly over powers of two (which make some platform mallocs sad).
- - Log malloc statistics from mallinfo() on platforms where it
- exists.
- Changes in version 0.2.0.3-alpha - 2007-07-29
- This third development snapshot introduces new experimental
- blocking-resistance features and a preliminary version of the v3
- directory voting design, and includes many other smaller features
- and bugfixes.
- o Major features:
- - The first pieces of our "bridge" design for blocking-resistance
- are implemented. People can run bridge directory authorities;
- people can run bridges; and people can configure their Tor clients
- with a set of bridges to use as the first hop into the Tor network.
- See http://archives.seul.org/or/talk/Jul-2007/msg00249.html for
- details.
- - Create listener connections before we setuid to the configured
- User and Group. Now non-Windows users can choose port values
- under 1024, start Tor as root, and have Tor bind those ports
- before it changes to another UID. (Windows users could already
- pick these ports.)
- - Added a new ConstrainedSockets config option to set SO_SNDBUF and
- SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
- on "vserver" accounts. (Patch from coderman.)
- - Be even more aggressive about separating local traffic from relayed
- traffic when RelayBandwidthRate is set. (Refines proposal 111.)
- o Major features (experimental):
- - First cut of code for "v3 dir voting": directory authorities will
- vote on a common network status document rather than each publishing
- their own opinion. This code needs more testing and more corner-case
- handling before it's ready for use.
- o Security fixes:
- - Directory authorities now call routers Fast if their bandwidth is
- at least 100KB/s, and consider their bandwidth adequate to be a
- Guard if it is at least 250KB/s, no matter the medians. This fix
- complements proposal 107. [Bugfix on 0.1.2.x]
- - Directory authorities now never mark more than 3 servers per IP as
- Valid and Running. (Implements proposal 109, by Kevin Bauer and
- Damon McCoy.)
- - Minor change to organizationName and commonName generation
- procedures in TLS certificates during Tor handshakes, to invalidate
- some earlier censorware approaches. This is not a long-term
- solution, but applying it will give us a bit of time to look into
- the epidemiology of countermeasures as they spread.
- o Major bugfixes (directory):
- - Rewrite directory tokenization code to never run off the end of
- a string. Fixes bug 455. Patch from croup. [Bugfix on 0.1.2.x]
- o Minor features (controller):
- - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
- match requests to applications. (Patch from Robert Hogan.)
- - Report address and port correctly on connections to DNSPort. (Patch
- from Robert Hogan.)
- - Add a RESOLVE command to launch hostname lookups. (Original patch
- from Robert Hogan.)
- - Add GETINFO status/enough-dir-info to let controllers tell whether
- Tor has downloaded sufficient directory information. (Patch
- from Tup.)
- - You can now use the ControlSocket option to tell Tor to listen for
- controller connections on Unix domain sockets on systems that
- support them. (Patch from Peter Palfrader.)
- - STREAM NEW events are generated for DNSPort requests and for
- tunneled directory connections. (Patch from Robert Hogan.)
- - New "GETINFO address-mappings/*" command to get address mappings
- with expiry information. "addr-mappings/*" is now deprecated.
- (Patch from Tup.)
- o Minor features (misc):
- - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
- from croup.)
- - The tor-gencert tool for v3 directory authorities now creates all
- files as readable to the file creator only, and write-protects
- the authority identity key.
- - When dumping memory usage, list bytes used in buffer memory
- free-lists.
- - When running with dmalloc, dump more stats on hup and on exit.
- - Directory authorities now fail quickly and (relatively) harmlessly
- if they generate a network status document that is somehow
- malformed.
- o Traffic load balancing improvements:
- - If exit bandwidth ever exceeds one third of total bandwidth, then
- use the correct formula to weight exit nodes when choosing paths.
- (Based on patch from Mike Perry.)
- - Choose perfectly fairly among routers when choosing by bandwidth and
- weighting by fraction of bandwidth provided by exits. Previously, we
- would choose with only approximate fairness, and correct ourselves
- if we ran off the end of the list. [Bugfix on 0.1.2.x]
- o Performance improvements:
- - Be more aggressive with freeing buffer RAM or putting it on the
- memory free lists.
- - Use Critical Sections rather than Mutexes for synchronizing threads
- on win32; Mutexes are heavier-weight, and designed for synchronizing
- between processes.
- o Deprecated and removed features:
- - RedirectExits is now deprecated.
- - Stop allowing address masks that do not correspond to bit prefixes.
- We have warned about these for a really long time; now it's time
- to reject them. (Patch from croup.)
- o Minor bugfixes (directory):
- - Fix another crash bug related to extra-info caching. (Bug found by
- Peter Palfrader.) [Bugfix on 0.2.0.2-alpha]
- - Directories no longer return a "304 not modified" when they don't
- have the networkstatus the client asked for. Also fix a memory
- leak when returning 304 not modified. [Bugfixes on 0.2.0.2-alpha]
- - We had accidentally labelled 0.1.2.x directory servers as not
- suitable for begin_dir requests, and had labelled no directory
- servers as suitable for uploading extra-info documents. [Bugfix
- on 0.2.0.1-alpha]
- o Minor bugfixes (dns):
- - Fix a crash when DNSPort is set more than once. (Patch from Robert
- Hogan.) [Bugfix on 0.2.0.2-alpha]
- - Add DNSPort connections to the global connection list, so that we
- can time them out correctly. (Bug found by Robert Hogan.) [Bugfix
- on 0.2.0.2-alpha]
- - Fix a dangling reference that could lead to a crash when DNSPort is
- changed or closed (Patch from Robert Hogan.) [Bugfix on
- 0.2.0.2-alpha]
- o Minor bugfixes (controller):
- - Provide DNS expiry times in GMT, not in local time. For backward
- compatibility, ADDRMAP events only provide GMT expiry in an extended
- field. "GETINFO address-mappings" always does the right thing.
- - Use CRLF line endings properly in NS events.
- - Terminate multi-line control events properly. (Original patch
- from tup.) [Bugfix on 0.1.2.x-alpha]
- - Do not include spaces in SOURCE_ADDR fields in STREAM
- events. Resolves bug 472. [Bugfix on 0.2.0.x-alpha]
- Changes in version 0.1.2.15 - 2007-07-17
- Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
- problems, fixes compilation on BSD, and fixes a variety of other
- bugs. Everybody should upgrade.
- o Major bugfixes (compilation):
- - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
- o Major bugfixes (crashes):
- - Try even harder not to dereference the first character after
- an mmap(). Reported by lodger.
- - Fix a crash bug in directory authorities when we re-number the
- routerlist while inserting a new router.
- - When the cached-routers file is an even multiple of the page size,
- don't run off the end and crash. (Fixes bug 455; based on idea
- from croup.)
- - Fix eventdns.c behavior on Solaris: It is critical to include
- orconfig.h _before_ sys/types.h, so that we can get the expected
- definition of _FILE_OFFSET_BITS.
- o Major bugfixes (security):
- - Fix a possible buffer overrun when using BSD natd support. Bug
- found by croup.
- - When sending destroy cells from a circuit's origin, don't include
- the reason for tearing down the circuit. The spec says we didn't,
- and now we actually don't. Reported by lodger.
- - Keep streamids from different exits on a circuit separate. This
- bug may have allowed other routers on a given circuit to inject
- cells into streams. Reported by lodger; fixes bug 446.
- - If there's a never-before-connected-to guard node in our list,
- never choose any guards past it. This way we don't expand our
- guard list unless we need to.
- o Minor bugfixes (guard nodes):
- - Weight guard selection by bandwidth, so that low-bandwidth nodes
- don't get overused as guards.
- o Minor bugfixes (directory):
- - Correctly count the number of authorities that recommend each
- version. Previously, we were under-counting by 1.
- - Fix a potential crash bug when we load many server descriptors at
- once and some of them make others of them obsolete. Fixes bug 458.
- o Minor bugfixes (hidden services):
- - Stop tearing down the whole circuit when the user asks for a
- connection to a port that the hidden service didn't configure.
- Resolves bug 444.
- o Minor bugfixes (misc):
- - On Windows, we were preventing other processes from reading
- cached-routers while Tor was running. Reported by janbar.
- - Fix a possible (but very unlikely) bug in picking routers by
- bandwidth. Add a log message to confirm that it is in fact
- unlikely. Patch from lodger.
- - Backport a couple of memory leak fixes.
- - Backport miscellaneous cosmetic bugfixes.
- Changes in version 0.2.0.2-alpha - 2007-06-02
- o Major bugfixes on 0.2.0.1-alpha:
- - Fix an assertion failure related to servers without extra-info digests.
- Resolves bugs 441 and 442.
- o Minor features (directory):
- - Support "If-Modified-Since" when answering HTTP requests for
- directories, running-routers documents, and network-status documents.
- (There's no need to support it for router descriptors, since those
- are downloaded by descriptor digest.)
- o Minor build issues:
- - Clear up some MIPSPro compiler warnings.
- - When building from a tarball on a machine that happens to have SVK
- installed, report the micro-revision as whatever version existed
- in the tarball, not as "x".
- Changes in version 0.2.0.1-alpha - 2007-06-01
- This early development snapshot provides new features for people running
- Tor as both a client and a server (check out the new RelayBandwidth
- config options); lets Tor run as a DNS proxy; and generally moves us
- forward on a lot of fronts.
- o Major features, server usability:
- - New config options RelayBandwidthRate and RelayBandwidthBurst:
- a separate set of token buckets for relayed traffic. Right now
- relayed traffic is defined as answers to directory requests, and
- OR connections that don't have any local circuits on them.
- o Major features, client usability:
- - A client-side DNS proxy feature to replace the need for
- dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
- for DNS requests on port 9999, use the Tor network to resolve them
- anonymously, and send the reply back like a regular DNS server.
- The code still only implements a subset of DNS.
- - Make PreferTunneledDirConns and TunnelDirConns work even when
- we have no cached directory info. This means Tor clients can now
- do all of their connections protected by TLS.
- o Major features, performance and efficiency:
- - Directory authorities accept and serve "extra info" documents for
- routers. These documents contain fields from router descriptors
- that aren't usually needed, and that use a lot of excess
- bandwidth. Once these fields are removed from router descriptors,
- the bandwidth savings should be about 60%. [Partially implements
- proposal 104.]
- - Servers upload extra-info documents to any authority that accepts
- them. Authorities (and caches that have been configured to download
- extra-info documents) download them as needed. [Partially implements
- proposal 104.]
- - Change the way that Tor buffers data that it is waiting to write.
- Instead of queueing data cells in an enormous ring buffer for each
- client->OR or OR->OR connection, we now queue cells on a separate
- queue for each circuit. This lets us use less slack memory, and
- will eventually let us be smarter about prioritizing different kinds
- of traffic.
- - Use memory pools to allocate cells with better speed and memory
- efficiency, especially on platforms where malloc() is inefficient.
- - Stop reading on edge connections when their corresponding circuit
- buffers are full; start again as the circuits empty out.
- o Major features, other:
- - Add an HSAuthorityRecordStats option that hidden service authorities
- can use to track statistics of overall hidden service usage without
- logging information that would be very useful to an attacker.
- - Start work implementing multi-level keys for directory authorities:
- Add a standalone tool to generate key certificates. (Proposal 103.)
- o Security fixes:
- - Directory authorities now call routers Stable if they have an
- uptime of at least 30 days, even if that's not the median uptime
- in the network. Implements proposal 107, suggested by Kevin Bauer
- and Damon McCoy.
- o Minor fixes (resource management):
- - Count the number of open sockets separately from the number
- of active connection_t objects. This will let us avoid underusing
- our allocated connection limit.
- - We no longer use socket pairs to link an edge connection to an
- anonymous directory connection or a DirPort test connection.
- Instead, we track the link internally and transfer the data
- in-process. This saves two sockets per "linked" connection (at the
- client and at the server), and avoids the nasty Windows socketpair()
- workaround.
- - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
- for every single inactive connection_t. Free items from the
- 4k/16k-buffer free lists when they haven't been used for a while.
- o Minor features (build):
- - Make autoconf search for libevent, openssl, and zlib consistently.
- - Update deprecated macros in configure.in.
- - When warning about missing headers, tell the user to let us
- know if the compile succeeds anyway, so we can downgrade the
- warning.
- - Include the current subversion revision as part of the version
- string: either fetch it directly if we're in an SVN checkout, do
- some magic to guess it if we're in an SVK checkout, or use
- the last-detected version if we're building from a .tar.gz.
- Use this version consistently in log messages.
- o Minor features (logging):
- - Always prepend "Bug: " to any log message about a bug.
- - Put a platform string (e.g. "Linux i686") in the startup log
- message, so when people paste just their logs, we know if it's
- OpenBSD or Windows or what.
- - When logging memory usage, break down memory used in buffers by
- buffer type.
- o Minor features (directory system):
- - New config option V2AuthoritativeDirectory that all directory
- authorities should set. This will let future authorities choose
- not to serve V2 directory information.
- - Directory authorities allow multiple router descriptors and/or extra
- info documents to be uploaded in a single go. This will make
- implementing proposal 104 simpler.
- o Minor features (controller):
- - Add a new config option __DisablePredictedCircuits designed for
- use by the controller, when we don't want Tor to build any circuits
- preemptively.
- - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
- so we can exit from the middle of the circuit.
- - Implement "getinfo status/circuit-established".
- - Implement "getinfo status/version/..." so a controller can tell
- whether the current version is recommended, and whether any versions
- are good, and how many authorities agree. (Patch from shibz.)
- o Minor features (hidden services):
- - Allow multiple HiddenServicePort directives with the same virtual
- port; when they occur, the user is sent round-robin to one
- of the target ports chosen at random. Partially fixes bug 393 by
- adding limited ad-hoc round-robining.
- o Minor features (other):
- - More unit tests.
- - Add a new AutomapHostsOnResolve option: when it is enabled, any
- resolve request for hosts matching a given pattern causes Tor to
- generate an internal virtual address mapping for that host. This
- allows DNSPort to work sensibly with hidden service users. By
- default, .exit and .onion addresses are remapped; the list of
- patterns can be reconfigured with AutomapHostsSuffixes.
- - Add an "-F" option to tor-resolve to force a resolve for a .onion
- address. Thanks to the AutomapHostsOnResolve option, this is no
- longer a completely silly thing to do.
- - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
- now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
- - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
- minus 1 byte: the actual maximum declared bandwidth.
- o Removed features:
- - Removed support for the old binary "version 0" controller protocol.
- This has been deprecated since 0.1.1, and warnings have been issued
- since 0.1.2. When we encounter a v0 control message, we now send
- back an error and close the connection.
- - Remove the old "dns worker" server DNS code: it hasn't been default
- since 0.1.2.2-alpha, and all the servers seem to be using the new
- eventdns code.
- o Minor bugfixes (portability):
- - Even though Windows is equally happy with / and \ as path separators,
- try to use \ consistently on Windows and / consistently on Unix: it
- makes the log messages nicer.
- - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
- - Read resolv.conf files correctly on platforms where read() returns
- partial results on small file reads.
- o Minor bugfixes (directory):
- - Correctly enforce that elements of directory objects do not appear
- more often than they are allowed to appear.
- - When we are reporting the DirServer line we just parsed, we were
- logging the second stanza of the key fingerprint, not the first.
- o Minor bugfixes (logging):
- - When we hit an EOF on a log (probably because we're shutting down),
- don't try to remove the log from the list: just mark it as
- unusable. (Bulletproofs against bug 222.)
- o Minor bugfixes (other):
- - In the exitlist script, only consider the most recently published
- server descriptor for each server. Also, when the user requests
- a list of servers that _reject_ connections to a given address,
- explicitly exclude the IPs that also have servers that accept
- connections to that address. (Resolves bug 405.)
- - Stop allowing hibernating servers to be "stable" or "fast".
- - On Windows, we were preventing other processes from reading
- cached-routers while Tor was running. (Reported by janbar)
- - Make the NodeFamilies config option work. (Reported by
- lodger -- it has never actually worked, even though we added it
- in Oct 2004.)
- - Check return values from pthread_mutex functions.
- - Don't save non-general-purpose router descriptors to the disk cache,
- because we have no way of remembering what their purpose was when
- we restart.
- - Add even more asserts to hunt down bug 417.
- - Build without verbose warnings even on (not-yet-released) gcc 4.2.
- - Fix a possible (but very unlikely) bug in picking routers by bandwidth.
- Add a log message to confirm that it is in fact unlikely.
- o Minor bugfixes (controller):
- - Make 'getinfo fingerprint' return a 551 error if we're not a
- server, so we match what the control spec claims we do. Reported
- by daejees.
- - Fix a typo in an error message when extendcircuit fails that
- caused us to not follow the \r\n-based delimiter protocol. Reported
- by daejees.
- o Code simplifications and refactoring:
- - Stop passing around circuit_t and crypt_path_t pointers that are
- implicit in other procedure arguments.
- - Drop the old code to choke directory connections when the
- corresponding OR connections got full: thanks to the cell queue
- feature, OR conns don't get full any more.
- - Make dns_resolve() handle attaching connections to circuits
- properly, so the caller doesn't have to.
- - Rename wants_to_read and wants_to_write to read/write_blocked_on_bw.
- - Keep the connection array as a dynamic smartlist_t, rather than as
- a fixed-sized array. This is important, as the number of connections
- is becoming increasingly decoupled from the number of sockets.
- Changes in version 0.1.2.14 - 2007-05-25
- Tor 0.1.2.14 changes the addresses of two directory authorities (this
- change especially affects those who serve or use hidden services),
- and fixes several other crash- and security-related bugs.
- o Directory authority changes:
- - Two directory authorities (moria1 and moria2) just moved to new
- IP addresses. This change will particularly affect those who serve
- or use hidden services.
- o Major bugfixes (crashes):
- - If a directory server runs out of space in the connection table
- as it's processing a begin_dir request, it will free the exit stream
- but leave it attached to the circuit, leading to unpredictable
- behavior. (Reported by seeess, fixes bug 425.)
- - Fix a bug in dirserv_remove_invalid() that would cause authorities
- to corrupt memory under some really unlikely scenarios.
- - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
- - Avoid segfaults when reading from mmaped descriptor file. (Reported
- by lodger.)
- o Major bugfixes (security):
- - When choosing an entry guard for a circuit, avoid using guards
- that are in the same family as the chosen exit -- not just guards
- that are exactly the chosen exit. (Reported by lodger.)
- o Major bugfixes (resource management):
- - If a directory authority is down, skip it when deciding where to get
- networkstatus objects or descriptors. Otherwise we keep asking
- every 10 seconds forever. Fixes bug 384.
- - Count it as a failure if we fetch a valid network-status but we
- don't want to keep it. Otherwise we'll keep fetching it and keep
- not wanting to keep it. Fixes part of bug 422.
- - If all of our dirservers have given us bad or no networkstatuses
- lately, then stop hammering them once per minute even when we
- think they're failed. Fixes another part of bug 422.
- o Minor bugfixes:
- - Actually set the purpose correctly for descriptors inserted with
- purpose=controller.
- - When we have k non-v2 authorities in our DirServer config,
- we ignored the last k authorities in the list when updating our
- network-statuses.
- - Correctly back-off from requesting router descriptors that we are
- having a hard time downloading.
- - Read resolv.conf files correctly on platforms where read() returns
- partial results on small file reads.
- - Don't rebuild the entire router store every time we get 32K of
- routers: rebuild it when the journal gets very large, or when
- the gaps in the store get very large.
- o Minor features:
- - When routers publish SVN revisions in their router descriptors,
- authorities now include those versions correctly in networkstatus
- documents.
- - Warn when using a version of libevent before 1.3b to run a server on
- OSX or BSD: these versions interact badly with userspace threads.
- Changes in version 0.1.2.13 - 2007-04-24
- This release features some major anonymity fixes, such as safer path
- selection; better client performance; faster bootstrapping, better
- address detection, and better DNS support for servers; write limiting as
- well as read limiting to make servers easier to run; and a huge pile of
- other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
- Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
- of the Freenode IRC network, remembering his patience and vision for
- free speech on the Internet.
- o Minor fixes:
- - Fix a memory leak when we ask for "all" networkstatuses and we
- get one we don't recognize.
- - Add more asserts to hunt down bug 417.
- - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
- Changes in version 0.1.2.12-rc - 2007-03-16
- o Major bugfixes:
- - Fix an infinite loop introduced in 0.1.2.7-alpha when we serve
- directory information requested inside Tor connections (i.e. via
- begin_dir cells). It only triggered when the same connection was
- serving other data at the same time. Reported by seeess.
- o Minor bugfixes:
- - When creating a circuit via the controller, send a 'launched'
- event when we're done, so we follow the spec better.
- Changes in version 0.1.2.11-rc - 2007-03-15
- o Minor bugfixes (controller), reported by daejees:
- - Correct the control spec to match how the code actually responds
- to 'getinfo addr-mappings/*'.
- - The control spec described a GUARDS event, but the code
- implemented a GUARD event. Standardize on GUARD, but let people
- ask for GUARDS too.
- Changes in version 0.1.2.10-rc - 2007-03-07
- o Major bugfixes (Windows):
- - Do not load the NT services library functions (which may not exist)
- just to detect if we're a service trying to shut down. Now we run
- on Win98 and friends again.
- o Minor bugfixes (other):
- - Clarify a couple of log messages.
- - Fix a misleading socks5 error number.
- Changes in version 0.1.2.9-rc - 2007-03-02
- o Major bugfixes (Windows):
- - On MinGW, use "%I64u" to printf/scanf 64-bit integers, instead
- of the usual GCC "%llu". This prevents a bug when saving 64-bit
- int configuration values: the high-order 32 bits would get
- truncated. In particular, we were being bitten by the default
- MaxAdvertisedBandwidth of 128 TB turning into 0. (Fixes bug 400
- and maybe also bug 397.)
- o Minor bugfixes (performance):
- - Use OpenSSL's AES implementation on platforms where it's faster.
- This could save us as much as 10% CPU usage.
- o Minor bugfixes (server):
- - Do not rotate onion key immediately after setting it for the first
- time.
- o Minor bugfixes (directory authorities):
- - Stop calling servers that have been hibernating for a long time
- "stable". Also, stop letting hibernating or obsolete servers affect
- uptime and bandwidth cutoffs.
- - Stop listing hibernating servers in the v1 directory.
- o Minor bugfixes (hidden services):
- - Upload hidden service descriptors slightly less often, to reduce
- load on authorities.
- o Minor bugfixes (other):
- - Fix an assert that could trigger if a controller quickly set then
- cleared EntryNodes. Bug found by Udo van den Heuvel.
- - On architectures where sizeof(int)>4, still clamp declarable bandwidth
- to INT32_MAX.
- - Fix a potential race condition in the rpm installer. Found by
- Stefan Nordhausen.
- - Try to fix eventdns warnings once and for all: do not treat a dns rcode
- of 2 as indicating that the server is completely bad; it sometimes
- means that the server is just bad for the request in question. (may fix
- the last of bug 326.)
- - Disable encrypted directory connections when we don't have a server
- descriptor for the destination. We'll get this working again in
- the 0.2.0 branch.
- Changes in version 0.1.2.8-beta - 2007-02-26
- o Major bugfixes (crashes):
- - Stop crashing when the controller asks us to resetconf more than
- one config option at once. (Vidalia 0.0.11 does this.)
- - Fix a crash that happened on Win98 when we're given command-line
- arguments: don't try to load NT service functions from advapi32.dll
- except when we need them. (Bug introduced in 0.1.2.7-alpha;
- resolves bug 389.)
- - Fix a longstanding obscure crash bug that could occur when
- we run out of DNS worker processes. (Resolves bug 390.)
- o Major bugfixes (hidden services):
- - Correctly detect whether hidden service descriptor downloads are
- in-progress. (Suggested by Karsten Loesing; fixes bug 399.)
- o Major bugfixes (accounting):
- - When we start during an accounting interval before it's time to wake
- up, remember to wake up at the correct time. (May fix bug 342.)
- o Minor bugfixes (controller):
- - Give the controller END_STREAM_REASON_DESTROY events _before_ we
- clear the corresponding on_circuit variable, and remember later
- that we don't need to send a redundant CLOSED event. Resolves part
- 3 of bug 367.
- - Report events where a resolve succeeded or where we got a socks
- protocol error correctly, rather than calling both of them
- "INTERNAL".
- - Change reported stream target addresses to IP consistently when
- we finally get the IP from an exit node.
- - Send log messages to the controller even if they happen to be very
- long.
- o Minor bugfixes (other):
- - Display correct results when reporting which versions are
- recommended, and how recommended they are. (Resolves bug 383.)
- - Improve our estimates for directory bandwidth to be less random:
- guess that an unrecognized directory will have the average bandwidth
- from all known directories, not that it will have the average
- bandwidth from those directories earlier than it on the list.
- - If we start a server with ClientOnly 1, then set ClientOnly to 0
- and hup, stop triggering an assert based on an empty onion_key.
- - On platforms with no working mmap() equivalent, don't warn the
- user when cached-routers doesn't exist.
- - Warn the user when mmap() [or its equivalent] fails for some reason
- other than file-not-found.
- - Don't warn the user when cached-routers.new doesn't exist: that's
- perfectly fine when starting up for the first time.
- - When EntryNodes are configured, rebuild the guard list to contain,
- in order: the EntryNodes that were guards before; the rest of the
- EntryNodes; the nodes that were guards before.
- - Mask out all signals in sub-threads; only the libevent signal
- handler should be processing them. This should prevent some crashes
- on some machines using pthreads. (Patch from coderman.)
- - Fix switched arguments on memset in the implementation of
- tor_munmap() for systems with no mmap() call.
- - When Tor receives a router descriptor that it asked for, but
- no longer wants (because it has received fresh networkstatuses
- in the meantime), do not warn the user. Cache the descriptor if
- we're a cache; drop it if we aren't.
- - Make earlier entry guards _really_ get retried when the network
- comes back online.
- - On a malformed DNS reply, always give an error to the corresponding
- DNS request.
- - Build with recent libevents on platforms that do not define the
- nonstandard types "u_int8_t" and friends.
- o Minor features (controller):
- - Warn the user when an application uses the obsolete binary v0
- control protocol. We're planning to remove support for it during
- the next development series, so it's good to give people some
- advance warning.
- - Add STREAM_BW events to report per-entry-stream bandwidth
- use. (Patch from Robert Hogan.)
- - Rate-limit SIGNEWNYM signals in response to controllers that
- impolitely generate them for every single stream. (Patch from
- mwenge; closes bug 394.)
- - Make REMAP stream events have a SOURCE (cache or exit), and
- make them generated in every case where we get a successful
- connected or resolved cell.
- o Minor bugfixes (performance):
- - Call router_have_min_dir_info half as often. (This is showing up in
- some profiles, but not others.)
- - When using GCC, make log_debug never get called at all, and its
- arguments never get evaluated, when no debug logs are configured.
- (This is showing up in some profiles, but not others.)
- o Minor features:
- - Remove some never-implemented options. Mark PathlenCoinWeight as
- obsolete.
- - Implement proposal 106: Stop requiring clients to have well-formed
- certificates; stop checking nicknames in certificates. (Clients
- have certificates so that they can look like Tor servers, but in
- the future we might want to allow them to look like regular TLS
- clients instead. Nicknames in certificates serve no purpose other
- than making our protocol easier to recognize on the wire.)
- - Revise messages on handshake failure again to be even more clear about
- which are incoming connections and which are outgoing.
- - Discard any v1 directory info that's over 1 month old (for
- directories) or over 1 week old (for running-routers lists).
- - Do not warn when individual nodes in the configuration's EntryNodes,
- ExitNodes, etc are down: warn only when all possible nodes
- are down. (Fixes bug 348.)
- - Always remove expired routers and networkstatus docs before checking
- whether we have enough information to build circuits. (Fixes
- bug 373.)
- - Put a lower-bound on MaxAdvertisedBandwidth.
- Changes in version 0.1.2.7-alpha - 2007-02-06
- o Major bugfixes (rate limiting):
- - Servers decline directory requests much more aggressively when
- they're low on bandwidth. Otherwise they end up queueing more and
- more directory responses, which can't be good for latency.
- - But never refuse directory requests from local addresses.
- - Fix a memory leak when sending a 503 response for a networkstatus
- request.
- - Be willing to read or write on local connections (e.g. controller
- connections) even when the global rate limiting buckets are empty.
- - If our system clock jumps back in time, don't publish a negative
- uptime in the descriptor. Also, don't let the global rate limiting
- buckets go absurdly negative.
- - Flush local controller connection buffers periodically as we're
- writing to them, so we avoid queueing 4+ megabytes of data before
- trying to flush.
- o Major bugfixes (NT services):
- - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
- command-line flag so that admins can override the default by saying
- "tor --service install --user "SomeUser"". This will not affect
- existing installed services. Also, warn the user that the service
- will look for its configuration file in the service user's
- %appdata% directory. (We can't do the 'hardwire the user's appdata
- directory' trick any more, since we may not have read access to that
- directory.)
- o Major bugfixes (other):
- - Previously, we would cache up to 16 old networkstatus documents
- indefinitely, if they came from nontrusted authorities. Now we
- discard them if they are more than 10 days old.
- - Fix a crash bug in the presence of DNS hijacking (reported by Andrew
- Del Vecchio).
- - Detect and reject malformed DNS responses containing circular
- pointer loops.
- - If exits are rare enough that we're not marking exits as guards,
- ignore exit bandwidth when we're deciding the required bandwidth
- to become a guard.
- - When we're handling a directory connection tunneled over Tor,
- don't fill up internal memory buffers with all the data we want
- to tunnel; instead, only add it if the OR connection that will
- eventually receive it has some room for it. (This can lead to
- slowdowns in tunneled dir connections; a better solution will have
- to wait for 0.2.0.)
- o Minor bugfixes (dns):
- - Add some defensive programming to eventdns.c in an attempt to catch
- possible memory-stomping bugs.
- - Detect and reject DNS replies containing IPv4 or IPv6 records with
- an incorrect number of bytes. (Previously, we would ignore the
- extra bytes.)
- - Fix as-yet-unused reverse IPv6 lookup code so it sends nybbles
- in the correct order, and doesn't crash.
- - Free memory held in recently-completed DNS lookup attempts on exit.
- This was not a memory leak, but may have been hiding memory leaks.
- - Handle TTL values correctly on reverse DNS lookups.
- - Treat failure to parse resolv.conf as an error.
- o Minor bugfixes (other):
- - Fix crash with "tor --list-fingerprint" (reported by seeess).
- - When computing clock skew from directory HTTP headers, consider what
- time it was when we finished asking for the directory, not what
- time it is now.
- - Expire socks connections if they spend too long waiting for the
- handshake to finish. Previously we would let them sit around for
- days, if the connecting application didn't close them either.
- - And if the socks handshake hasn't started, don't send a
- "DNS resolve socks failed" handshake reply; just close it.
- - Stop using C functions that OpenBSD's linker doesn't like.
- - Don't launch requests for descriptors unless we have networkstatuses
- from at least half of the authorities. This delays the first
- download slightly under pathological circumstances, but can prevent
- us from downloading a bunch of descriptors we don't need.
- - Do not log IPs with TLS failures for incoming TLS
- connections. (Fixes bug 382.)
- - If the user asks to use invalid exit nodes, be willing to use
- unstable ones.
- - Stop using the reserved ac_cv namespace in our configure script.
- - Call stat() slightly less often; use fstat() when possible.
- - Refactor the way we handle pending circuits when an OR connection
- completes or fails, in an attempt to fix a rare crash bug.
- - Only rewrite a conn's address based on X-Forwarded-For: headers
- if it's a parseable public IP address; and stop adding extra quotes
- to the resulting address.
- o Major features:
- - Weight directory requests by advertised bandwidth. Now we can
- let servers enable write limiting but still allow most clients to
- succeed at their directory requests. (We still ignore weights when
- choosing a directory authority; I hope this is a feature.)
- o Minor features:
- - Create a new file ReleaseNotes which was the old ChangeLog. The
- new ChangeLog file now includes the summaries for all development
- versions too.
- - Check for addresses with invalid characters at the exit as well
- as at the client, and warn less verbosely when they fail. You can
- override this by setting ServerDNSAllowNonRFC953Addresses to 1.
- - Adapt a patch from goodell to let the contrib/exitlist script
- take arguments rather than require direct editing.
- - Inform the server operator when we decide not to advertise a
- DirPort due to AccountingMax enabled or a low BandwidthRate. It
- was confusing Zax, so now we're hopefully more helpful.
- - Bring us one step closer to being able to establish an encrypted
- directory tunnel without knowing a descriptor first. Still not
- ready yet. As part of the change, now assume we can use a
- create_fast cell if we don't know anything about a router.
- - Allow exit nodes to use nameservers running on ports other than 53.
- - Servers now cache reverse DNS replies.
- - Add an --ignore-missing-torrc command-line option so that we can
- get the "use sensible defaults if the configuration file doesn't
- exist" behavior even when specifying a torrc location on the command
- line.
- o Minor features (controller):
- - Track reasons for OR connection failure; make these reasons
- available via the controller interface. (Patch from Mike Perry.)
- - Add a SOCKS_BAD_HOSTNAME client status event so controllers
- can learn when clients are sending malformed hostnames to Tor.
- - Clean up documentation for controller status events.
- - Add a REMAP status to stream events to note that a stream's
- address has changed because of a cached address or a MapAddress
- directive.
- Changes in version 0.1.2.6-alpha - 2007-01-09
- o Major bugfixes:
- - Fix an assert error introduced in 0.1.2.5-alpha: if a single TLS
- connection handles more than 4 gigs in either direction, we crash.
- - Fix an assert error introduced in 0.1.2.5-alpha: if we're an
- advertised exit node, somebody might try to exit from us when
- we're bootstrapping and before we've built our descriptor yet.
- Refuse the connection rather than crashing.
- o Minor bugfixes:
- - Warn if we (as a server) find that we've resolved an address that we
- weren't planning to resolve.
- - Warn that using select() on any libevent version before 1.1 will be
- unnecessarily slow (even for select()).
- - Flush ERR-level controller status events just like we currently
- flush ERR-level log events, so that a Tor shutdown doesn't prevent
- the controller from learning about current events.
- o Minor features (more controller status events):
- - Implement EXTERNAL_ADDRESS server status event so controllers can
- learn when our address changes.
- - Implement BAD_SERVER_DESCRIPTOR server status event so controllers
- can learn when directories reject our descriptor.
- - Implement SOCKS_UNKNOWN_PROTOCOL client status event so controllers
- can learn when a client application is speaking a non-socks protocol
- to our SocksPort.
- - Implement DANGEROUS_SOCKS client status event so controllers
- can learn when a client application is leaking DNS addresses.
- - Implement BUG general status event so controllers can learn when
- Tor is unhappy about its internal invariants.
- - Implement CLOCK_SKEW general status event so controllers can learn
- when Tor thinks the system clock is set incorrectly.
- - Implement GOOD_SERVER_DESCRIPTOR and ACCEPTED_SERVER_DESCRIPTOR
- server status events so controllers can learn when their descriptors
- are accepted by a directory.
- - Implement CHECKING_REACHABILITY and REACHABILITY_{SUCCEEDED|FAILED}
- server status events so controllers can learn about Tor's progress in
- deciding whether it's reachable from the outside.
- - Implement BAD_LIBEVENT general status event so controllers can learn
- when we have a version/method combination in libevent that needs to
- be changed.
- - Implement NAMESERVER_STATUS, NAMESERVER_ALL_DOWN, DNS_HIJACKED,
- and DNS_USELESS server status events so controllers can learn
- about changes to DNS server status.
- o Minor features (directory):
- - Authorities no longer recommend exits as guards if this would shift
- too much load to the exit nodes.
- Changes in version 0.1.2.5-alpha - 2007-01-06
- o Major features:
- - Enable write limiting as well as read limiting. Now we sacrifice
- capacity if we're pushing out lots of directory traffic, rather
- than overrunning the user's intended bandwidth limits.
- - Include TLS overhead when counting bandwidth usage; previously, we
- would count only the bytes sent over TLS, but not the bytes used
- to send them.
- - Support running the Tor service with a torrc not in the same
- directory as tor.exe and default to using the torrc located in
- the %appdata%\Tor\ of the user who installed the service. Patch
- from Matt Edman.
- - Servers now check for the case when common DNS requests are going to
- wildcarded addresses (i.e. all getting the same answer), and change
- their exit policy to reject *:* if it's happening.
- - Implement BEGIN_DIR cells, so we can connect to the directory
- server via TLS to do encrypted directory requests rather than
- plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
- config options if you like.
- o Minor features (config and docs):
- - Start using the state file to store bandwidth accounting data:
- the bw_accounting file is now obsolete. We'll keep generating it
- for a while for people who are still using 0.1.2.4-alpha.
- - Try to batch changes to the state file so that we do as few
- disk writes as possible while still storing important things in
- a timely fashion.
- - The state file and the bw_accounting file get saved less often when
- the AvoidDiskWrites config option is set.
- - Make PIDFile work on Windows (untested).
- - Add internal descriptions for a bunch of configuration options:
- accessible via controller interface and in comments in saved
- options files.
- - Reject *:563 (NNTPS) in the default exit policy. We already reject
- NNTP by default, so this seems like a sensible addition.
- - Clients now reject hostnames with invalid characters. This should
- avoid some inadvertent info leaks. Add an option
- AllowNonRFC953Hostnames to disable this behavior, in case somebody
- is running a private network with hosts called @, !, and #.
- - Add a maintainer script to tell us which options are missing
- documentation: "make check-docs".
- - Add a new address-spec.txt document to describe our special-case
- addresses: .exit, .onion, and .noconnnect.
- o Minor features (DNS):
- - Ongoing work on eventdns infrastructure: now it has dns server
- and ipv6 support. One day Tor will make use of it.
- - Add client-side caching for reverse DNS lookups.
- - Add support to tor-resolve tool for reverse lookups and SOCKS5.
- - When we change nameservers or IP addresses, reset and re-launch
- our tests for DNS hijacking.
- o Minor features (directory):
- - Authorities now specify server versions in networkstatus. This adds
- about 2% to the size of compressed networkstatus docs, and allows
- clients to tell which servers support BEGIN_DIR and which don't.
- The implementation is forward-compatible with a proposed future
- protocol version scheme not tied to Tor versions.
- - DirServer configuration lines now have an orport= option so
- clients can open encrypted tunnels to the authorities without
- having downloaded their descriptors yet. Enabled for moria1,
- moria2, tor26, and lefkada now in the default configuration.
- - Directory servers are more willing to send a 503 "busy" if they
- are near their write limit, especially for v1 directory requests.
- Now they can use their limited bandwidth for actual Tor traffic.
- - Clients track responses with status 503 from dirservers. After a
- dirserver has given us a 503, we try not to use it until an hour has
- gone by, or until we have no dirservers that haven't given us a 503.
- - When we get a 503 from a directory, and we're not a server, we don't
- count the failure against the total number of failures allowed
- for the thing we're trying to download.
- - Report X-Your-Address-Is correctly from tunneled directory
- connections; don't report X-Your-Address-Is when it's an internal
- address; and never believe reported remote addresses when they're
- internal.
- - Protect against an unlikely DoS attack on directory servers.
- - Add a BadDirectory flag to network status docs so that authorities
- can (eventually) tell clients about caches they believe to be
- broken.
- o Minor features (controller):
- - Have GETINFO dir/status/* work on hosts with DirPort disabled.
- - Reimplement GETINFO so that info/names stays in sync with the
- actual keys.
- - Implement "GETINFO fingerprint".
- - Implement "SETEVENTS GUARD" so controllers can get updates on
- entry guard status as it changes.
- o Minor features (clean up obsolete pieces):
- - Remove some options that have been deprecated since at least
- 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
- SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
- to set log options.
- - We no longer look for identity and onion keys in "identity.key" and
- "onion.key" -- these were replaced by secret_id_key and
- secret_onion_key in 0.0.8pre1.
- - We no longer require unrecognized directory entries to be
- preceded by "opt".
- o Major bugfixes (security):
- - Stop sending the HttpProxyAuthenticator string to directory
- servers when directory connections are tunnelled through Tor.
- - Clients no longer store bandwidth history in the state file.
- - Do not log introduction points for hidden services if SafeLogging
- is set.
- - When generating bandwidth history, round down to the nearest
- 1k. When storing accounting data, round up to the nearest 1k.
- - When we're running as a server, remember when we last rotated onion
- keys, so that we will rotate keys once they're a week old even if
- we never stay up for a week ourselves.
- o Major bugfixes (other):
- - Fix a longstanding bug in eventdns that prevented the count of
- timed-out resolves from ever being reset. This bug caused us to
- give up on a nameserver the third time it timed out, and try it
- 10 seconds later... and to give up on it every time it timed out
- after that.
- - Take out the '5 second' timeout from the connection retry
- schedule. Now the first connect attempt will wait a full 10
- seconds before switching to a new circuit. Perhaps this will help
- a lot. Based on observations from Mike Perry.
- - Fix a bug on the Windows implementation of tor_mmap_file() that
- would prevent the cached-routers file from ever loading. Reported
- by John Kimble.
- o Minor bugfixes:
- - Fix an assert failure when a directory authority sets
- AuthDirRejectUnlisted and then receives a descriptor from an
- unlisted router. Reported by seeess.
- - Avoid a double-free when parsing malformed DirServer lines.
- - Fix a bug when a BSD-style PF socket is first used. Patch from
- Fabian Keil.
- - Fix a bug in 0.1.2.2-alpha that prevented clients from asking
- to resolve an address at a given exit node even when they ask for
- it by name.
- - Servers no longer ever list themselves in their "family" line,
- even if configured to do so. This makes it easier to configure
- family lists conveniently.
- - When running as a server, don't fall back to 127.0.0.1 when no
- nameservers are configured in /etc/resolv.conf; instead, make the
- user fix resolv.conf or specify nameservers explicitly. (Resolves
- bug 363.)
- - Stop accepting certain malformed ports in configured exit policies.
- - Don't re-write the fingerprint file every restart, unless it has
- changed.
- - Stop warning when a single nameserver fails: only warn when _all_ of
- our nameservers have failed. Also, when we only have one nameserver,
- raise the threshold for deciding that the nameserver is dead.
- - Directory authorities now only decide that routers are reachable
- if their identity keys are as expected.
- - When the user uses bad syntax in the Log config line, stop
- suggesting other bad syntax as a replacement.
- - Correctly detect ipv6 DNS capability on OpenBSD.
- o Minor bugfixes (controller):
- - Report the circuit number correctly in STREAM CLOSED events. Bug
- reported by Mike Perry.
- - Do not report bizarre values for results of accounting GETINFOs
- when the last second's write or read exceeds the allotted bandwidth.
- - Report "unrecognized key" rather than an empty string when the
- controller tries to fetch a networkstatus that doesn't exist.
- Changes in version 0.1.1.26 - 2006-12-14
- o Security bugfixes:
- - Stop sending the HttpProxyAuthenticator string to directory
- servers when directory connections are tunnelled through Tor.
- - Clients no longer store bandwidth history in the state file.
- - Do not log introduction points for hidden services if SafeLogging
- is set.
- o Minor bugfixes:
- - Fix an assert failure when a directory authority sets
- AuthDirRejectUnlisted and then receives a descriptor from an
- unlisted router (reported by seeess).
- Changes in version 0.1.2.4-alpha - 2006-12-03
- o Major features:
- - Add support for using natd; this allows FreeBSDs earlier than
- 5.1.2 to have ipfw send connections through Tor without using
- SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
- o Minor features:
- - Make all connections to addresses of the form ".noconnect"
- immediately get closed. This lets application/controller combos
- successfully test whether they're talking to the same Tor by
- watching for STREAM events.
- - Make cross.sh cross-compilation script work even when autogen.sh
- hasn't been run. (Patch from Michael Mohr.)
- - Statistics dumped by -USR2 now include a breakdown of public key
- operations, for profiling.
- o Major bugfixes:
- - Fix a major leak when directory authorities parse their
- approved-routers list, a minor memory leak when we fail to pick
- an exit node, and a few rare leaks on errors.
- - Handle TransPort connections even when the server sends data before
- the client sends data. Previously, the connection would just hang
- until the client sent data. (Patch from tup based on patch from
- Zajcev Evgeny.)
- - Avoid assert failure when our cached-routers file is empty on
- startup.
- o Minor bugfixes:
- - Don't log spurious warnings when we see a circuit close reason we
- don't recognize; it's probably just from a newer version of Tor.
- - Have directory authorities allow larger amounts of drift in uptime
- without replacing the server descriptor: previously, a server that
- restarted every 30 minutes could have 48 "interesting" descriptors
- per day.
- - Start linking to the Tor specification and Tor reference manual
- correctly in the Windows installer.
- - Add Vidalia to the OS X uninstaller script, so when we uninstall
- Tor/Privoxy we also uninstall Vidalia.
- - Resume building on Irix64, and fix a lot of warnings from its
- MIPSpro C compiler.
- - Don't corrupt last_guessed_ip in router_new_address_suggestion()
- when we're running as a client.
- Changes in version 0.1.1.25 - 2006-11-04
- o Major bugfixes:
- - When a client asks us to resolve (rather than connect to)
- an address, and we have a cached answer, give them the cached
- answer. Previously, we would give them no answer at all.
- - We were building exactly the wrong circuits when we predict
- hidden service requirements, meaning Tor would have to build all
- its circuits on demand.
- - If none of our live entry guards have a high uptime, but we
- require a guard with a high uptime, try adding a new guard before
- we give up on the requirement. This patch should make long-lived
- connections more stable on average.
- - When testing reachability of our DirPort, don't launch new
- tests when there's already one in progress -- unreachable
- servers were stacking up dozens of testing streams.
- o Security bugfixes:
- - When the user sends a NEWNYM signal, clear the client-side DNS
- cache too. Otherwise we continue to act on previous information.
- o Minor bugfixes:
- - Avoid a memory corruption bug when creating a hash table for
- the first time.
- - Avoid possibility of controller-triggered crash when misusing
- certain commands from a v0 controller on platforms that do not
- handle printf("%s",NULL) gracefully.
- - Avoid infinite loop on unexpected controller input.
- - Don't log spurious warnings when we see a circuit close reason we
- don't recognize; it's probably just from a newer version of Tor.
- - Add Vidalia to the OS X uninstaller script, so when we uninstall
- Tor/Privoxy we also uninstall Vidalia.
- Changes in version 0.1.2.3-alpha - 2006-10-29
- o Minor features:
- - Prepare for servers to publish descriptors less often: never
- discard a descriptor simply for being too old until either it is
- recommended by no authorities, or until we get a better one for
- the same router. Make caches consider retaining old recommended
- routers for even longer.
- - If most authorities set a BadExit flag for a server, clients
- don't think of it as a general-purpose exit. Clients only consider
- authorities that advertise themselves as listing bad exits.
- - Directory servers now provide 'Pragma: no-cache' and 'Expires'
- headers for content, so that we can work better in the presence of
- caching HTTP proxies.
- - Allow authorities to list nodes as bad exits by fingerprint or by
- address.
- o Minor features, controller:
- - Add a REASON field to CIRC events; for backward compatibility, this
- field is sent only to controllers that have enabled the extended
- event format. Also, add additional reason codes to explain why
- a given circuit has been destroyed or truncated. (Patches from
- Mike Perry)
- - Add a REMOTE_REASON field to extended CIRC events to tell the
- controller about why a remote OR told us to close a circuit.
- - Stream events also now have REASON and REMOTE_REASON fields,
- working much like those for circuit events.
- - There's now a GETINFO ns/... field so that controllers can ask Tor
- about the current status of a router.
- - A new event type "NS" to inform a controller when our opinion of
- a router's status has changed.
- - Add a GETINFO events/names and GETINFO features/names so controllers
- can tell which events and features are supported.
- - A new CLEARDNSCACHE signal to allow controllers to clear the
- client-side DNS cache without expiring circuits.
- o Security bugfixes:
- - When the user sends a NEWNYM signal, clear the client-side DNS
- cache too. Otherwise we continue to act on previous information.
- o Minor bugfixes:
- - Avoid sending junk to controllers or segfaulting when a controller
- uses EVENT_NEW_DESC with verbose nicknames.
- - Stop triggering asserts if the controller tries to extend hidden
- service circuits (reported by mwenge).
- - Avoid infinite loop on unexpected controller input.
- - When the controller does a "GETINFO network-status", tell it
- about even those routers whose descriptors are very old, and use
- long nicknames where appropriate.
- - Change NT service functions to be loaded on demand. This lets us
- build with MinGW without breaking Tor for Windows 98 users.
- - Do DirPort reachability tests less often, since a single test
- chews through many circuits before giving up.
- - In the hidden service example in torrc.sample, stop recommending
- esoteric and discouraged hidden service options.
- - When stopping an NT service, wait up to 10 sec for it to actually
- stop. Patch from Matt Edman; resolves bug 295.
- - Fix handling of verbose nicknames with ORCONN controller events:
- make them show up exactly when requested, rather than exactly when
- not requested.
- - When reporting verbose nicknames in entry_guards_getinfo(), avoid
- printing a duplicate "$" in the keys we send (reported by mwenge).
- - Correctly set maximum connection limit on Cygwin. (This time
- for sure!)
- - Try to detect Windows correctly when cross-compiling.
- - Detect the size of the routers file correctly even if it is
- corrupted (on systems without mmap) or not page-aligned (on systems
- with mmap). This bug was harmless.
- - Sometimes we didn't bother sending a RELAY_END cell when an attempt
- to open a stream fails; now we do in more cases. This should
- make clients able to find a good exit faster in some cases, since
- unhandleable requests will now get an error rather than timing out.
- - Resolve two memory leaks when rebuilding the on-disk router cache
- (reported by fookoowa).
- - Clean up minor code warnings suggested by the MIPSpro C compiler,
- and reported by some Centos users.
- - Controller signals now work on non-Unix platforms that don't define
- SIGUSR1 and SIGUSR2 the way we expect.
- - Patch from Michael Mohr to contrib/cross.sh, so it checks more
- values before failing, and always enables eventdns.
- - Libevent-1.2 exports, but does not define in its headers, strlcpy.
- Try to fix this in configure.in by checking for most functions
- before we check for libevent.
- Changes in version 0.1.2.2-alpha - 2006-10-07
- o Major features:
- - Make our async eventdns library on-by-default for Tor servers,
- and plan to deprecate the separate dnsworker threads.
- - Add server-side support for "reverse" DNS lookups (using PTR
- records so clients can determine the canonical hostname for a given
- IPv4 address). Only supported by servers using eventdns; servers
- now announce in their descriptors whether they support eventdns.
- - Specify and implement client-side SOCKS5 interface for reverse DNS
- lookups (see doc/socks-extensions.txt).
- - Add a BEGIN_DIR relay cell type for an easier in-protocol way to
- connect to directory servers through Tor. Previously, clients needed
- to find Tor exits to make private connections to directory servers.
- - Avoid choosing Exit nodes for entry or middle hops when the
- total bandwidth available from non-Exit nodes is much higher than
- the total bandwidth available from Exit nodes.
- - Workaround for name servers (like Earthlink's) that hijack failing
- DNS requests and replace the no-such-server answer with a "helpful"
- redirect to an advertising-driven search portal. Also work around
- DNS hijackers who "helpfully" decline to hijack known-invalid
- RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
- lets you turn it off.
- - Send out a burst of long-range padding cells once we've established
- that we're reachable. Spread them over 4 circuits, so hopefully
- a few will be fast. This exercises our bandwidth and bootstraps
- us into the directory more quickly.
- o New/improved config options:
- - Add new config option "ResolvConf" to let the server operator
- choose an alternate resolve.conf file when using eventdns.
- - Add an "EnforceDistinctSubnets" option to control our "exclude
- servers on the same /16" behavior. It's still on by default; this
- is mostly for people who want to operate private test networks with
- all the machines on the same subnet.
- - If one of our entry guards is on the ExcludeNodes list, or the
- directory authorities don't think it's a good guard, treat it as
- if it were unlisted: stop using it as a guard, and throw it off
- the guards list if it stays that way for a long time.
- - Allow directory authorities to be marked separately as authorities
- for the v1 directory protocol, the v2 directory protocol, and
- as hidden service directories, to make it easier to retire old
- authorities. V1 authorities should set "HSAuthoritativeDir 1"
- to continue being hidden service authorities too.
- - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
- o Minor features, controller:
- - Fix CIRC controller events so that controllers can learn the
- identity digests of non-Named servers used in circuit paths.
- - Let controllers ask for more useful identifiers for servers. Instead
- of learning identity digests for un-Named servers and nicknames
- for Named servers, the new identifiers include digest, nickname,
- and indication of Named status. Off by default; see control-spec.txt
- for more information.
- - Add a "getinfo address" controller command so it can display Tor's
- best guess to the user.
- - New controller event to alert the controller when our server
- descriptor has changed.
- - Give more meaningful errors on controller authentication failure.
- o Minor features, other:
- - When asked to resolve a hostname, don't use non-exit servers unless
- requested to do so. This allows servers with broken DNS to be
- useful to the network.
- - Divide eventdns log messages into warn and info messages.
- - Reserve the nickname "Unnamed" for routers that can't pick
- a hostname: any router can call itself Unnamed; directory
- authorities will never allocate Unnamed to any particular router;
- clients won't believe that any router is the canonical Unnamed.
- - Only include function names in log messages for info/debug messages.
- For notice/warn/err, the content of the message should be clear on
- its own, and printing the function name only confuses users.
- - Avoid some false positives during reachability testing: don't try
- to test via a server that's on the same /24 as us.
- - If we fail to build a circuit to an intended enclave, and it's
- not mandatory that we use that enclave, stop wanting it.
- - When eventdns is enabled, allow multithreaded builds on NetBSD and
- OpenBSD. (We had previously disabled threads on these platforms
- because they didn't have working thread-safe resolver functions.)
- o Major bugfixes, anonymity/security:
- - If a client asked for a server by name, and there's a named server
- in our network-status but we don't have its descriptor yet, we
- could return an unnamed server instead.
- - Fix NetBSD bug that could allow someone to force uninitialized RAM
- to be sent to a server's DNS resolver. This only affects NetBSD
- and other platforms that do not bounds-check tolower().
- - Reject (most) attempts to use Tor circuits with length one. (If
- many people start using Tor as a one-hop proxy, exit nodes become
- a more attractive target for compromise.)
- - Just because your DirPort is open doesn't mean people should be
- able to remotely teach you about hidden service descriptors. Now
- only accept rendezvous posts if you've got HSAuthoritativeDir set.
- o Major bugfixes, other:
- - Don't crash on race condition in dns.c: tor_assert(!resolve->expire)
- - When a client asks the server to resolve (not connect to)
- an address, and it has a cached answer, give them the cached answer.
- Previously, the server would give them no answer at all.
- - Allow really slow clients to not hang up five minutes into their
- directory downloads (suggested by Adam J. Richter).
- - We were building exactly the wrong circuits when we anticipated
- hidden service requirements, meaning Tor would have to build all
- its circuits on demand.
- - Avoid crashing when we mmap a router cache file of size 0.
- - When testing reachability of our DirPort, don't launch new
- tests when there's already one in progress -- unreachable
- servers were stacking up dozens of testing streams.
- o Minor bugfixes, correctness:
- - If we're a directory mirror and we ask for "all" network status
- documents, we would discard status documents from authorities
- we don't recognize.
- - Avoid a memory corruption bug when creating a hash table for
- the first time.
- - Avoid controller-triggered crash when misusing certain commands
- from a v0 controller on platforms that do not handle
- printf("%s",NULL) gracefully.
- - Don't crash when a controller sends a third argument to an
- "extendcircuit" request.
- - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
- response; fix error code when "getinfo dir/status/" fails.
- - Avoid crash when telling controller stream-status and a stream
- is detached.
- - Patch from Adam Langley to fix assert() in eventdns.c.
- - Fix a debug log message in eventdns to say "X resolved to Y"
- instead of "X resolved to X".
- - Make eventdns give strings for DNS errors, not just error numbers.
- - Track unreachable entry guards correctly: don't conflate
- 'unreachable by us right now' with 'listed as down by the directory
- authorities'. With the old code, if a guard was unreachable by
- us but listed as running, it would clog our guard list forever.
- - Behave correctly in case we ever have a network with more than
- 2GB/s total advertised capacity.
- - Make TrackExitHosts case-insensitive, and fix the behavior of
- ".suffix" TrackExitHosts items to avoid matching in the middle of
- an address.
- - Finally fix the openssl warnings from newer gccs that believe that
- ignoring a return value is okay, but casting a return value and
- then ignoring it is a sign of madness.
- - Prevent the contrib/exitlist script from printing the same
- result more than once.
- - Patch from Steve Hildrey: Generate network status correctly on
- non-versioning dirservers.
- - Don't listen to the X-Your-Address-Is hint if you did the lookup
- via Tor; otherwise you'll think you're the exit node's IP address.
- o Minor bugfixes, performance:
- - Two small performance improvements on parsing descriptors.
- - Major performance improvement on inserting descriptors: change
- algorithm from O(n^2) to O(n).
- - Make the common memory allocation path faster on machines where
- malloc(0) returns a pointer.
- - Start remembering X-Your-Address-Is directory hints even if you're
- a client, so you can become a server more smoothly.
- - Avoid duplicate entries on MyFamily line in server descriptor.
- o Packaging, features:
- - Remove architecture from OS X builds. The official builds are
- now universal binaries.
- - The Debian package now uses --verify-config when (re)starting,
- to distinguish configuration errors from other errors.
- - Update RPMs to require libevent 1.1b.
- o Packaging, bugfixes:
- - Patches so Tor builds with MinGW on Windows.
- - Patches so Tor might run on Cygwin again.
- - Resume building on non-gcc compilers and ancient gcc. Resume
- building with the -O0 compile flag. Resume building cleanly on
- Debian woody.
- - Run correctly on OS X platforms with case-sensitive filesystems.
- - Correct includes for net/if.h and net/pfvar.h on OpenBSD (from Tup).
- - Add autoconf checks so Tor can build on Solaris x86 again.
- o Documentation
- - Documented (and renamed) ServerDNSSearchDomains and
- ServerDNSResolvConfFile options.
- - Be clearer that the *ListenAddress directives can be repeated
- multiple times.
- Changes in version 0.1.1.24 - 2006-09-29
- o Major bugfixes:
- - Allow really slow clients to not hang up five minutes into their
- directory downloads (suggested by Adam J. Richter).
- - Fix major performance regression from 0.1.0.x: instead of checking
- whether we have enough directory information every time we want to
- do something, only check when the directory information has changed.
- This should improve client CPU usage by 25-50%.
- - Don't crash if, after a server has been running for a while,
- it can't resolve its hostname.
- o Minor bugfixes:
- - Allow Tor to start when RunAsDaemon is set but no logs are set.
- - Don't crash when the controller receives a third argument to an
- "extendcircuit" request.
- - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
- response; fix error code when "getinfo dir/status/" fails.
- - Fix configure.in to not produce broken configure files with
- more recent versions of autoconf. Thanks to Clint for his auto*
- voodoo.
- - Fix security bug on NetBSD that could allow someone to force
- uninitialized RAM to be sent to a server's DNS resolver. This
- only affects NetBSD and other platforms that do not bounds-check
- tolower().
- - Warn user when using libevent 1.1a or earlier with win32 or kqueue
- methods: these are known to be buggy.
- - If we're a directory mirror and we ask for "all" network status
- documents, we would discard status documents from authorities
- we don't recognize.
- Changes in version 0.1.2.1-alpha - 2006-08-27
- o Major features:
- - Add "eventdns" async dns library from Adam Langley, tweaked to
- build on OSX and Windows. Only enabled if you pass the
- --enable-eventdns argument to configure.
- - Allow servers with no hostname or IP address to learn their
- IP address by asking the directory authorities. This code only
- kicks in when you would normally have exited with a "no address"
- error. Nothing's authenticated, so use with care.
- - Rather than waiting a fixed amount of time between retrying
- application connections, we wait only 5 seconds for the first,
- 10 seconds for the second, and 15 seconds for each retry after
- that. Hopefully this will improve the expected user experience.
- - Patch from Tup to add support for transparent AP connections:
- this basically bundles the functionality of trans-proxy-tor
- into the Tor mainline. Now hosts with compliant pf/netfilter
- implementations can redirect TCP connections straight to Tor
- without diverting through SOCKS. Needs docs.
- - Busy directory servers save lots of memory by spooling server
- descriptors, v1 directories, and v2 networkstatus docs to buffers
- as needed rather than en masse. Also mmap the cached-routers
- files, so we don't need to keep the whole thing in memory too.
- - Automatically avoid picking more than one node from the same
- /16 network when constructing a circuit.
- - Revise and clean up the torrc.sample that we ship with; add
- a section for BandwidthRate and BandwidthBurst.
- o Minor features:
- - Split circuit_t into origin_circuit_t and or_circuit_t, and
- split connection_t into edge, or, dir, control, and base structs.
- These will save quite a bit of memory on busy servers, and they'll
- also help us track down bugs in the code and bugs in the spec.
- - Experimentally re-enable kqueue on OSX when using libevent 1.1b
- or later. Log when we are doing this, so we can diagnose it when
- it fails. (Also, recommend libevent 1.1b for kqueue and
- win32 methods; deprecate libevent 1.0b harder; make libevent
- recommendation system saner.)
- - Start being able to build universal binaries on OS X (thanks
- to Phobos).
- - Export the default exit policy via the control port, so controllers
- don't need to guess what it is / will be later.
- - Add a man page entry for ProtocolWarnings.
- - Add TestVia config option to the man page.
- - Remove even more protocol-related warnings from Tor server logs,
- such as bad TLS handshakes and malformed begin cells.
- - Stop fetching descriptors if you're not a dir mirror and you
- haven't tried to establish any circuits lately. [This currently
- causes some dangerous behavior, because when you start up again
- you'll use your ancient server descriptors.]
- - New DirPort behavior: if you have your dirport set, you download
- descriptors aggressively like a directory mirror, whether or not
- your ORPort is set.
- - Get rid of the router_retry_connections notion. Now routers
- no longer try to rebuild long-term connections to directory
- authorities, and directory authorities no longer try to rebuild
- long-term connections to all servers. We still don't hang up
- connections in these two cases though -- we need to look at it
- more carefully to avoid flapping, and we likely need to wait til
- 0.1.1.x is obsolete.
- - Drop compatibility with obsolete Tors that permit create cells
- to have the wrong circ_id_type.
- - Re-enable per-connection rate limiting. Get rid of the "OP
- bandwidth" concept. Lay groundwork for "bandwidth classes" --
- separate global buckets that apply depending on what sort of conn
- it is.
- - Start publishing one minute or so after we find our ORPort
- to be reachable. This will help reduce the number of descriptors
- we have for ourselves floating around, since it's quite likely
- other things (e.g. DirPort) will change during that minute too.
- - Fork the v1 directory protocol into its own spec document,
- and mark dir-spec.txt as the currently correct (v2) spec.
- o Major bugfixes:
- - When we find our DirPort to be reachable, publish a new descriptor
- so we'll tell the world (reported by pnx).
- - Publish a new descriptor after we hup/reload. This is important
- if our config has changed such that we'll want to start advertising
- our DirPort now, etc.
- - Allow Tor to start when RunAsDaemon is set but no logs are set.
- - When we have a state file we cannot parse, tell the user and
- move it aside. Now we avoid situations where the user starts
- Tor in 1904, Tor writes a state file with that timestamp in it,
- the user fixes her clock, and Tor refuses to start.
- - Fix configure.in to not produce broken configure files with
- more recent versions of autoconf. Thanks to Clint for his auto*
- voodoo.
- - "tor --verify-config" now exits with -1(255) or 0 depending on
- whether the config options are bad or good.
- - Resolve bug 321 when using dnsworkers: append a period to every
- address we resolve at the exit node, so that we do not accidentally
- pick up local addresses, and so that failing searches are retried
- in the resolver search domains. (This is already solved for
- eventdns.) (This breaks Blossom servers for now.)
- - If we are using an exit enclave and we can't connect, e.g. because
- its webserver is misconfigured to not listen on localhost, then
- back off and try connecting from somewhere else before we fail.
- o Minor bugfixes:
- - Start compiling on MinGW on Windows (patches from Mike Chiussi).
- - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
- - Fix bug 314: Tor clients issued "unsafe socks" warnings even
- when the IP address is mapped through MapAddress to a hostname.
- - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
- useless IPv6 DNS resolves.
- - Patch suggested by Karsten Loesing: respond to SIGNAL command
- before we execute the signal, in case the signal shuts us down.
- - Clean up AllowInvalidNodes man page entry.
- - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
- - Add more asserts to track down an assert error on a windows Tor
- server with connection_add being called with socket == -1.
- - Handle reporting OR_CONN_EVENT_NEW events to the controller.
- - Fix misleading log messages: an entry guard that is "unlisted",
- as well as not known to be "down" (because we've never heard
- of it), is not therefore "up".
- - Remove code to special-case "-cvs" ending, since it has not
- actually mattered since 0.0.9.
- - Make our socks5 handling more robust to broken socks clients:
- throw out everything waiting on the buffer in between socks
- handshake phases, since they can't possibly (so the theory
- goes) have predicted what we plan to respond to them.
- Changes in version 0.1.1.23 - 2006-07-30
- o Major bugfixes:
- - Fast Tor servers, especially exit nodes, were triggering asserts
- due to a bug in handling the list of pending DNS resolves. Some
- bugs still remain here; we're hunting them.
- - Entry guards could crash clients by sending unexpected input.
- - More fixes on reachability testing: if you find yourself reachable,
- then don't ever make any client requests (so you stop predicting
- circuits), then hup or have your clock jump, then later your IP
- changes, you won't think circuits are working, so you won't try to
- test reachability, so you won't publish.
- o Minor bugfixes:
- - Avoid a crash if the controller does a resetconf firewallports
- and then a setconf fascistfirewall=1.
- - Avoid an integer underflow when the dir authority decides whether
- a router is stable: we might wrongly label it stable, and compute
- a slightly wrong median stability, when a descriptor is published
- later than now.
- - Fix a place where we might trigger an assert if we can't build our
- own server descriptor yet.
- Changes in version 0.1.1.22 - 2006-07-05
- o Major bugfixes:
- - Fix a big bug that was causing servers to not find themselves
- reachable if they changed IP addresses. Since only 0.1.1.22+
- servers can do reachability testing correctly, now we automatically
- make sure to test via one of these.
- - Fix to allow clients and mirrors to learn directory info from
- descriptor downloads that get cut off partway through.
- - Directory authorities had a bug in deciding if a newly published
- descriptor was novel enough to make everybody want a copy -- a few
- servers seem to be publishing new descriptors many times a minute.
- o Minor bugfixes:
- - Fix a rare bug that was causing some servers to complain about
- "closing wedged cpuworkers" and skip some circuit create requests.
- - Make the Exit flag in directory status documents actually work.
- Changes in version 0.1.1.21 - 2006-06-10
- o Crash and assert fixes from 0.1.1.20:
- - Fix a rare crash on Tor servers that have enabled hibernation.
- - Fix a seg fault on startup for Tor networks that use only one
- directory authority.
- - Fix an assert from a race condition that occurs on Tor servers
- while exiting, where various threads are trying to log that they're
- exiting, and delete the logs, at the same time.
- - Make our unit tests pass again on certain obscure platforms.
- o Other fixes:
- - Add support for building SUSE RPM packages.
- - Speed up initial bootstrapping for clients: if we are making our
- first ever connection to any entry guard, then don't mark it down
- right after that.
- - When only one Tor server in the network is labelled as a guard,
- and we've already picked him, we would cycle endlessly picking him
- again, being unhappy about it, etc. Now we specifically exclude
- current guards when picking a new guard.
- - Servers send create cells more reliably after the TLS connection
- is established: we were sometimes forgetting to send half of them
- when we had more than one pending.
- - If we get a create cell that asks us to extend somewhere, but the
- Tor server there doesn't match the expected digest, we now send
- a destroy cell back, rather than silently doing nothing.
- - Make options->RedirectExit work again.
- - Make cookie authentication for the controller work again.
- - Stop being picky about unusual characters in the arguments to
- mapaddress. It's none of our business.
- - Add a new config option "TestVia" that lets you specify preferred
- middle hops to use for test circuits. Perhaps this will let me
- debug the reachability problems better.
- o Log / documentation fixes:
- - If we're a server and some peer has a broken TLS certificate, don't
- log about it unless ProtocolWarnings is set, i.e., we want to hear
- about protocol violations by others.
- - Fix spelling of VirtualAddrNetwork in man page.
- - Add a better explanation at the top of the autogenerated torrc file
- about what happened to our old torrc.
- Changes in version 0.1.1.20 - 2006-05-23
- o Bugfixes:
- - Downgrade a log severity where servers complain that they're
- invalid.
- - Avoid a compile warning on FreeBSD.
- - Remove string size limit on NEWDESC messages; solve bug 291.
- - Correct the RunAsDaemon entry in the man page; ignore RunAsDaemon
- more thoroughly when we're running on windows.
- Changes in version 0.1.1.19-rc - 2006-05-03
- o Minor bugs:
- - Regenerate our local descriptor if it's dirty and we try to use
- it locally (e.g. if it changes during reachability detection).
- - If we setconf our ORPort to 0, we continued to listen on the
- old ORPort and receive connections.
- - Avoid a second warning about machine/limits.h on Debian
- GNU/kFreeBSD.
- - Be willing to add our own routerinfo into the routerlist.
- Now authorities will include themselves in their directories
- and network-statuses.
- - Stop trying to upload rendezvous descriptors to every
- directory authority: only try the v1 authorities.
- - Servers no longer complain when they think they're not
- registered with the directory authorities. There were too many
- false positives.
- - Backport dist-rpm changes so rpms can be built without errors.
- o Features:
- - Implement an option, VirtualAddrMask, to set which addresses
- get handed out in response to mapaddress requests. This works
- around a bug in tsocks where 127.0.0.0/8 is never socksified.
- Changes in version 0.1.1.18-rc - 2006-04-10
- o Major fixes:
- - Work harder to download live network-statuses from all the
- directory authorities we know about. Improve the threshold
- decision logic so we're more robust to edge cases.
- - When fetching rendezvous descriptors, we were willing to ask
- v2 authorities too, which would always return 404.
- o Minor fixes:
- - Stop listing down or invalid nodes in the v1 directory. This will
- reduce its bulk by about 1/3, and reduce load on directory
- mirrors.
- - When deciding whether a router is Fast or Guard-worthy, consider
- his advertised BandwidthRate and not just the BandwidthCapacity.
- - No longer ship INSTALL and README files -- they are useless now.
- - Force rpmbuild to behave and honor target_cpu.
- - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
- - Start to include translated versions of the tor-doc-*.html
- files, along with the screenshots. Still needs more work.
- - Start sending back 512 and 451 errors if mapaddress fails,
- rather than not sending anything back at all.
- - When we fail to bind or listen on an incoming or outgoing
- socket, we should close it before failing. otherwise we just
- leak it. (thanks to weasel for finding.)
- - Allow "getinfo dir/status/foo" to work, as long as your DirPort
- is enabled. (This is a hack, and will be fixed in 0.1.2.x.)
- - Make NoPublish (even though deprecated) work again.
- - Fix a minor security flaw where a versioning auth dirserver
- could list a recommended version many times in a row to make
- clients more convinced that it's recommended.
- - Fix crash bug if there are two unregistered servers running
- with the same nickname, one of them is down, and you ask for
- them by nickname in your EntryNodes or ExitNodes. Also, try
- to pick the one that's running rather than an arbitrary one.
- - Fix an infinite loop we could hit if we go offline for too long.
- - Complain when we hit WSAENOBUFS on recv() or write() too.
- Perhaps this will help us hunt the bug.
- - If you're not a versioning dirserver, don't put the string
- "client-versions \nserver-versions \n" in your network-status.
- - Lower the minimum required number of file descriptors to 1000,
- so we can have some overhead for Valgrind on Linux, where the
- default ulimit -n is 1024.
- o New features:
- - Add tor.dizum.com as the fifth authoritative directory server.
- - Add a new config option FetchUselessDescriptors, off by default,
- for when you plan to run "exitlist" on your client and you want
- to know about even the non-running descriptors.
- Changes in version 0.1.1.17-rc - 2006-03-28
- o Major fixes:
- - Clients and servers since 0.1.1.10-alpha have been expiring
- connections whenever they are idle for 5 minutes and they *do*
- have circuits on them. Oops. With this new version, clients will
- discard their previous entry guard choices and avoid choosing
- entry guards running these flawed versions.
- - Fix memory leak when uncompressing concatenated zlib streams. This
- was causing substantial leaks over time on Tor servers.
- - The v1 directory was including servers as much as 48 hours old,
- because that's how the new routerlist->routers works. Now only
- include them if they're 20 hours old or less.
- o Minor fixes:
- - Resume building on irix64, netbsd 2.0, etc.
- - On non-gcc compilers (e.g. solaris), use "-g -O" instead of
- "-Wall -g -O2".
- - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
- and it is confusing some users.
- - Mirrors stop caching the v1 directory so often.
- - Make the max number of old descriptors that a cache will hold
- rise with the number of directory authorities, so we can scale.
- - Change our win32 uname() hack to be more forgiving about what
- win32 versions it thinks it's found.
- o New features:
- - Add lefkada.eecs.harvard.edu as a fourth authoritative directory
- server.
- - When the controller's *setconf commands fail, collect an error
- message in a string and hand it back to the controller.
- - Make the v2 dir's "Fast" flag based on relative capacity, just
- like "Stable" is based on median uptime. Name everything in the
- top 7/8 Fast, and only the top 1/2 gets to be a Guard.
- - Log server fingerprint on startup, so new server operators don't
- have to go hunting around their filesystem for it.
- - Return a robots.txt on our dirport to discourage google indexing.
- - Let the controller ask for GETINFO dir/status/foo so it can ask
- directly rather than connecting to the dir port. Only works when
- dirport is set for now.
- o New config options rather than constants in the code:
- - SocksTimeout: How long do we let a socks connection wait
- unattached before we fail it?
- - CircuitBuildTimeout: Cull non-open circuits that were born
- at least this many seconds ago.
- - CircuitIdleTimeout: Cull open clean circuits that were born
- at least this many seconds ago.
- Changes in version 0.1.1.16-rc - 2006-03-18
- o Bugfixes on 0.1.1.15-rc:
- - Fix assert when the controller asks to attachstream a connect-wait
- or resolve-wait stream.
- - Now do address rewriting when the controller asks us to attach
- to a particular circuit too. This will let Blossom specify
- "moria2.exit" without having to learn what moria2's IP address is.
- - Make the "tor --verify-config" command-line work again, so people
- can automatically check if their torrc will parse.
- - Authoritative dirservers no longer require an open connection from
- a server to consider him "reachable". We need this change because
- when we add new auth dirservers, old servers won't know not to
- hang up on them.
- - Let Tor build on Sun CC again.
- - Fix an off-by-one buffer size in dirserv.c that magically never
- hit our three authorities but broke sjmurdoch's own tor network.
- - If we as a directory mirror don't know of any v1 directory
- authorities, then don't try to cache any v1 directories.
- - Stop warning about unknown servers in our family when they are
- given as hex digests.
- - Stop complaining as quickly to the server operator that he
- hasn't registered his nickname/key binding.
- - Various cleanups so we can add new V2 Auth Dirservers.
- - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
- reflect the updated flags in our v2 dir protocol.
- - Resume allowing non-printable characters for exit streams (both
- for connecting and for resolving). Now we tolerate applications
- that don't follow the RFCs. But continue to block malformed names
- at the socks side.
- o Bugfixes on 0.1.0.x:
- - Fix assert bug in close_logs(): when we close and delete logs,
- remove them all from the global "logfiles" list.
- - Fix minor integer overflow in calculating when we expect to use up
- our bandwidth allocation before hibernating.
- - Fix a couple of bugs in OpenSSL detection. Also, deal better when
- there are multiple SSLs installed with different versions.
- - When we try to be a server and Address is not explicitly set and
- our hostname resolves to a private IP address, try to use an
- interface address if it has a public address. Now Windows machines
- that think of themselves as localhost can work by default.
- o New features:
- - Let the controller ask for GETINFO dir/server/foo so it can ask
- directly rather than connecting to the dir port.
- - Let the controller tell us about certain router descriptors
- that it doesn't want Tor to use in circuits. Implement
- SETROUTERPURPOSE and modify +POSTDESCRIPTOR to do this.
- - New config option SafeSocks to reject all application connections
- using unsafe socks protocols. Defaults to off.
- Changes in version 0.1.1.15-rc - 2006-03-11
- o Bugfixes and cleanups:
- - When we're printing strings from the network, don't try to print
- non-printable characters. This protects us against shell escape
- sequence exploits, and also against attacks to fool humans into
- misreading their logs.
- - Fix a bug where Tor would fail to establish any connections if you
- left it off for 24 hours and then started it: we were happy with
- the obsolete network statuses, but they all referred to router
- descriptors that were too old to fetch, so we ended up with no
- valid router descriptors.
- - Fix a seg fault in the controller's "getinfo orconn-status"
- command while listing status on incoming handshaking connections.
- Introduce a status name "NEW" for these connections.
- - If we get a linelist or linelist_s config option from the torrc
- (e.g. ExitPolicy) and it has no value, warn and skip rather than
- silently resetting it to its default.
- - Don't abandon entry guards until they've been down or gone for
- a whole month.
- - Cleaner and quieter log messages.
- o New features:
- - New controller signal NEWNYM that makes new application requests
- use clean circuits.
- - Add a new circuit purpose 'controller' to let the controller ask
- for a circuit that Tor won't try to use. Extend the EXTENDCIRCUIT
- controller command to let you specify the purpose if you're
- starting a new circuit. Add a new SETCIRCUITPURPOSE controller
- command to let you change a circuit's purpose after it's been
- created.
- - Accept "private:*" in routerdesc exit policies; not generated yet
- because older Tors do not understand it.
- - Add BSD-style contributed startup script "rc.subr" from Peter
- Thoenen.
- Changes in version 0.1.1.14-alpha - 2006-02-20
- o Bugfixes on 0.1.1.x:
- - Don't die if we ask for a stdout or stderr log (even implicitly)
- and we're set to RunAsDaemon -- just warn.
- - We still had a few bugs in the OR connection rotation code that
- caused directory servers to slowly aggregate connections to other
- fast Tor servers. This time for sure!
- - Make log entries on Win32 include the name of the function again.
- - We were treating a pair of exit policies if they were equal even
- if one said accept and the other said reject -- causing us to
- not always publish a new descriptor since we thought nothing
- had changed.
- - Retry pending server downloads as well as pending networkstatus
- downloads when we unexpectedly get a socks request.
- - We were ignoring the IS_FAST flag in the directory status,
- meaning we were willing to pick trivial-bandwidth nodes for "fast"
- connections.
- - If the controller's SAVECONF command fails (e.g. due to file
- permissions), let the controller know that it failed.
- o Features:
- - If we're trying to be a Tor server and running Windows 95/98/ME
- as a server, explain that we'll likely crash.
- - When we're a server, a client asks for an old-style directory,
- and our write bucket is empty, don't give it to him. This way
- small servers can continue to serve the directory *sometimes*,
- without getting overloaded.
- - Compress exit policies even more -- look for duplicate lines
- and remove them.
- - Clients now honor the "guard" flag in the router status when
- picking entry guards, rather than looking at is_fast or is_stable.
- - Retain unrecognized lines in $DATADIR/state file, so that we can
- be forward-compatible.
- - Generate 18.0.0.0/8 address policy format in descs when we can;
- warn when the mask is not reducible to a bit-prefix.
- - Let the user set ControlListenAddress in the torrc. This can be
- dangerous, but there are some cases (like a secured LAN) where it
- makes sense.
- - Split ReachableAddresses into ReachableDirAddresses and
- ReachableORAddresses, so we can restrict Dir conns to port 80
- and OR conns to port 443.
- - Now we can target arch and OS in rpm builds (contributed by
- Phobos). Also make the resulting dist-rpm filename match the
- target arch.
- - New config options to help controllers: FetchServerDescriptors
- and FetchHidServDescriptors for whether to fetch server
- info and hidserv info or let the controller do it, and
- PublishServerDescriptor and PublishHidServDescriptors.
- - Also let the controller set the __AllDirActionsPrivate config
- option if you want all directory fetches/publishes to happen via
- Tor (it assumes your controller bootstraps your circuits).
- Changes in version 0.1.0.17 - 2006-02-17
- o Crash bugfixes on 0.1.0.x:
- - When servers with a non-zero DirPort came out of hibernation,
- sometimes they would trigger an assert.
- o Other important bugfixes:
- - On platforms that don't have getrlimit (like Windows), we were
- artificially constraining ourselves to a max of 1024
- connections. Now just assume that we can handle as many as 15000
- connections. Hopefully this won't cause other problems.
- o Backported features:
- - When we're a server, a client asks for an old-style directory,
- and our write bucket is empty, don't give it to him. This way
- small servers can continue to serve the directory *sometimes*,
- without getting overloaded.
- - Whenever you get a 503 in response to a directory fetch, try
- once more. This will become important once servers start sending
- 503's whenever they feel busy.
- - Fetch a new directory every 120 minutes, not every 40 minutes.
- Now that we have hundreds of thousands of users running the old
- directory algorithm, it's starting to hurt a lot.
- - Bump up the period for forcing a hidden service descriptor upload
- from 20 minutes to 1 hour.
- Changes in version 0.1.1.13-alpha - 2006-02-09
- o Crashes in 0.1.1.x:
- - When you tried to setconf ORPort via the controller, Tor would
- crash. So people using TorCP to become a server were sad.
- - Solve (I hope) the stack-smashing bug that we were seeing on fast
- servers. The problem appears to be something do with OpenSSL's
- random number generation, or how we call it, or something. Let me
- know if the crashes continue.
- - Turn crypto hardware acceleration off by default, until we find
- somebody smart who can test it for us. (It appears to produce
- seg faults in at least some cases.)
- - Fix a rare assert error when we've tried all intro points for
- a hidden service and we try fetching the service descriptor again:
- "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed"
- o Major fixes:
- - Fix a major load balance bug: we were round-robining in 16 KB
- chunks, and servers with bandwidthrate of 20 KB, while downloading
- a 600 KB directory, would starve their other connections. Now we
- try to be a bit more fair.
- - Dir authorities and mirrors were never expiring the newest
- descriptor for each server, causing memory and directory bloat.
- - Fix memory-bloating and connection-bloating bug on servers: We
- were never closing any connection that had ever had a circuit on
- it, because we were checking conn->n_circuits == 0, yet we had a
- bug that let it go negative.
- - Make Tor work using squid as your http proxy again -- squid
- returns an error if you ask for a URL that's too long, and it uses
- a really generic error message. Plus, many people are behind a
- transparent squid so they don't even realize it.
- - On platforms that don't have getrlimit (like Windows), we were
- artificially constraining ourselves to a max of 1024
- connections. Now just assume that we can handle as many as 15000
- connections. Hopefully this won't cause other problems.
- - Add a new config option ExitPolicyRejectPrivate which defaults to
- 1. This means all exit policies will begin with rejecting private
- addresses, unless the server operator explicitly turns it off.
- o Major features:
- - Clients no longer download descriptors for non-running
- descriptors.
- - Before we add new directory authorities, we should make it
- clear that only v1 authorities should receive/publish hidden
- service descriptors.
- o Minor features:
- - As soon as we've fetched some more directory info, immediately
- try to download more server descriptors. This way we don't have
- a 10 second pause during initial bootstrapping.
- - Remove even more loud log messages that the server operator can't
- do anything about.
- - When we're running an obsolete or un-recommended version, make
- the log message more clear about what the problem is and what
- versions *are* still recommended.
- - Provide a more useful warn message when our onion queue gets full:
- the CPU is too slow or the exit policy is too liberal.
- - Don't warn when we receive a 503 from a dirserver/cache -- this
- will pave the way for them being able to refuse if they're busy.
- - When we fail to bind a listener, try to provide a more useful
- log message: e.g., "Is Tor already running?"
- - Adjust tor-spec to parameterize cell and key lengths. Now Ian
- Goldberg can prove things about our handshake protocol more
- easily.
- - MaxConn has been obsolete for a while now. Document the ConnLimit
- config option, which is a *minimum* number of file descriptors
- that must be available else Tor refuses to start.
- - Apply Matt Ghali's --with-syslog-facility patch to ./configure
- if you log to syslog and want something other than LOG_DAEMON.
- - Make dirservers generate a separate "guard" flag to mean,
- "would make a good entry guard". Make clients parse it and vote
- on it. Not used by clients yet.
- - Implement --with-libevent-dir option to ./configure. Also, improve
- search techniques to find libevent, and use those for openssl too.
- - Bump the default bandwidthrate to 3 MB, and burst to 6 MB
- - Only start testing reachability once we've established a
- circuit. This will make startup on dirservers less noisy.
- - Don't try to upload hidden service descriptors until we have
- established a circuit.
- - Fix the controller's "attachstream 0" command to treat conn like
- it just connected, doing address remapping, handling .exit and
- .onion idioms, and so on. Now we're more uniform in making sure
- that the controller hears about new and closing connections.
- Changes in version 0.1.1.12-alpha - 2006-01-11
- o Bugfixes on 0.1.1.x:
- - The fix to close duplicate server connections was closing all
- Tor client connections if they didn't establish a circuit
- quickly enough. Oops.
- - Fix minor memory issue (double-free) that happened on exit.
- o Bugfixes on 0.1.0.x:
- - Tor didn't warn when it failed to open a log file.
- Changes in version 0.1.1.11-alpha - 2006-01-10
- o Crashes in 0.1.1.x:
- - Include all the assert/crash fixes from 0.1.0.16.
- - If you start Tor and then quit very quickly, there were some
- races that tried to free things that weren't allocated yet.
- - Fix a rare memory stomp if you're running hidden services.
- - Fix segfault when specifying DirServer in config without nickname.
- - Fix a seg fault when you finish connecting to a server but at
- that moment you dump his server descriptor.
- - Extendcircuit and Attachstream controller commands would
- assert/crash if you don't give them enough arguments.
- - Fix an assert error when we're out of space in the connection_list
- and we try to post a hidden service descriptor (reported by weasel).
- - If you specify a relative torrc path and you set RunAsDaemon in
- your torrc, then it chdir()'s to the new directory. If you HUP,
- it tries to load the new torrc location, fails, and exits.
- The fix: no longer allow a relative path to torrc using -f.
- o Major features:
- - Implement "entry guards": automatically choose a handful of entry
- nodes and stick with them for all circuits. Only pick new guards
- when the ones you have are unsuitable, and if the old guards
- become suitable again, switch back. This will increase security
- dramatically against certain end-point attacks. The EntryNodes
- config option now provides some hints about which entry guards you
- want to use most; and StrictEntryNodes means to only use those.
- - New directory logic: download by descriptor digest, not by
- fingerprint. Caches try to download all listed digests from
- authorities; clients try to download "best" digests from caches.
- This avoids partitioning and isolating attacks better.
- - Make the "stable" router flag in network-status be the median of
- the uptimes of running valid servers, and make clients pay
- attention to the network-status flags. Thus the cutoff adapts
- to the stability of the network as a whole, making IRC, IM, etc
- connections more reliable.
- o Major fixes:
- - Tor servers with dynamic IP addresses were needing to wait 18
- hours before they could start doing reachability testing using
- the new IP address and ports. This is because they were using
- the internal descriptor to learn what to test, yet they were only
- rebuilding the descriptor once they decided they were reachable.
- - Tor 0.1.1.9 and 0.1.1.10 had a serious bug that caused clients
- to download certain server descriptors, throw them away, and then
- fetch them again after 30 minutes. Now mirrors throw away these
- server descriptors so clients can't get them.
- - We were leaving duplicate connections to other ORs open for a week,
- rather than closing them once we detect a duplicate. This only
- really affected authdirservers, but it affected them a lot.
- - Spread the authdirservers' reachability testing over the entire
- testing interval, so we don't try to do 500 TLS's at once every
- 20 minutes.
- o Minor fixes:
- - If the network is down, and we try to connect to a conn because
- we have a circuit in mind, and we timeout (30 seconds) because the
- network never answers, we were expiring the circuit, but we weren't
- obsoleting the connection or telling the entry_guards functions.
- - Some Tor servers process billions of cells per day. These statistics
- need to be uint64_t's.
- - Check for integer overflows in more places, when adding elements
- to smartlists. This could possibly prevent a buffer overflow
- on malicious huge inputs. I don't see any, but I haven't looked
- carefully.
- - ReachableAddresses kept growing new "reject *:*" lines on every
- setconf/reload.
- - When you "setconf log" via the controller, it should remove all
- logs. We were automatically adding back in a "log notice stdout".
- - Newly bootstrapped Tor networks couldn't establish hidden service
- circuits until they had nodes with high uptime. Be more tolerant.
- - We were marking servers down when they could not answer every piece
- of the directory request we sent them. This was far too harsh.
- - Fix the torify (tsocks) config file to not use Tor for localhost
- connections.
- - Directory authorities now go to the proper authority when asking for
- a networkstatus, even when they want a compressed one.
- - Fix a harmless bug that was causing Tor servers to log
- "Got an end because of misc error, but we're not an AP. Closing."
- - Authorities were treating their own descriptor changes as cosmetic,
- meaning the descriptor available in the network-status and the
- descriptor that clients downloaded were different.
- - The OS X installer was adding a symlink for tor_resolve but
- the binary was called tor-resolve (reported by Thomas Hardly).
- - Workaround a problem with some http proxies where they refuse GET
- requests that specify "Content-Length: 0" (reported by Adrian).
- - Fix wrong log message when you add a "HiddenServiceNodes" config
- line without any HiddenServiceDir line (reported by Chris Thomas).
- o Minor features:
- - Write the TorVersion into the state file so we have a prayer of
- keeping forward and backward compatibility.
- - Revive the FascistFirewall config option rather than eliminating it:
- now it's a synonym for ReachableAddresses *:80,*:443.
- - Clients choose directory servers from the network status lists,
- not from their internal list of router descriptors. Now they can
- go to caches directly rather than needing to go to authorities
- to bootstrap.
- - Directory authorities ignore router descriptors that have only
- cosmetic differences: do this for 0.1.0.x servers now too.
- - Add a new flag to network-status indicating whether the server
- can answer v2 directory requests too.
- - Authdirs now stop whining so loudly about bad descriptors that
- they fetch from other dirservers. So when there's a log complaint,
- it's for sure from a freshly uploaded descriptor.
- - Reduce memory requirements in our structs by changing the order
- of fields.
- - There used to be two ways to specify your listening ports in a
- server descriptor: on the "router" line and with a separate "ports"
- line. Remove support for the "ports" line.
- - New config option "AuthDirRejectUnlisted" for auth dirservers as
- a panic button: if we get flooded with unusable servers we can
- revert to only listing servers in the approved-routers file.
- - Auth dir servers can now mark a fingerprint as "!reject" or
- "!invalid" in the approved-routers file (as its nickname), to
- refuse descriptors outright or include them but marked as invalid.
- - Servers store bandwidth history across restarts/crashes.
- - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
- get a better idea of why their circuits failed. Not used yet.
- - Directory mirrors now cache up to 16 unrecognized network-status
- docs. Now we can add new authdirservers and they'll be cached too.
- - When picking a random directory, prefer non-authorities if any
- are known.
- - New controller option "getinfo desc/all-recent" to fetch the
- latest server descriptor for every router that Tor knows about.
- Changes in version 0.1.0.16 - 2006-01-02
- o Crash bugfixes on 0.1.0.x:
- - On Windows, build with a libevent patch from "I-M Weasel" to avoid
- corrupting the heap, losing FDs, or crashing when we need to resize
- the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
- - It turns out sparc64 platforms crash on unaligned memory access
- too -- so detect and avoid this.
- - Handle truncated compressed data correctly (by detecting it and
- giving an error).
- - Fix possible-but-unlikely free(NULL) in control.c.
- - When we were closing connections, there was a rare case that
- stomped on memory, triggering seg faults and asserts.
- - Avoid potential infinite recursion when building a descriptor. (We
- don't know that it ever happened, but better to fix it anyway.)
- - We were neglecting to unlink marked circuits from soon-to-close OR
- connections, which caused some rare scribbling on freed memory.
- - Fix a memory stomping race bug when closing the joining point of two
- rendezvous circuits.
- - Fix an assert in time parsing found by Steven Murdoch.
- o Other bugfixes on 0.1.0.x:
- - When we're doing reachability testing, provide more useful log
- messages so the operator knows what to expect.
- - Do not check whether DirPort is reachable when we are suppressing
- advertising it because of hibernation.
- - When building with -static or on Solaris, we sometimes needed -ldl.
- - When we're deciding whether a stream has enough circuits around
- that can handle it, count the freshly dirty ones and not the ones
- that are so dirty they won't be able to handle it.
- - When we're expiring old circuits, we had a logic error that caused
- us to close new rendezvous circuits rather than old ones.
- - Give a more helpful log message when you try to change ORPort via
- the controller: you should upgrade Tor if you want that to work.
- - We were failing to parse Tor versions that start with "Tor ".
- - Tolerate faulty streams better: when a stream fails for reason
- exitpolicy, stop assuming that the router is lying about his exit
- policy. When a stream fails for reason misc, allow it to retry just
- as if it was resolvefailed. When a stream has failed three times,
- reset its failure count so we can try again and get all three tries.
- Changes in version 0.1.1.10-alpha - 2005-12-11
- o Correctness bugfixes on 0.1.0.x:
- - On Windows, build with a libevent patch from "I-M Weasel" to avoid
- corrupting the heap, losing FDs, or crashing when we need to resize
- the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
- - Stop doing the complex voodoo overkill checking for insecure
- Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
- - When we were closing connections, there was a rare case that
- stomped on memory, triggering seg faults and asserts.
- - We were neglecting to unlink marked circuits from soon-to-close OR
- connections, which caused some rare scribbling on freed memory.
- - When we're deciding whether a stream has enough circuits around
- that can handle it, count the freshly dirty ones and not the ones
- that are so dirty they won't be able to handle it.
- - Recover better from TCP connections to Tor servers that are
- broken but don't tell you (it happens!); and rotate TLS
- connections once a week.
- - When we're expiring old circuits, we had a logic error that caused
- us to close new rendezvous circuits rather than old ones.
- - Fix a scary-looking but apparently harmless bug where circuits
- would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
- servers, and never switch to state CIRCUIT_STATE_OPEN.
- - When building with -static or on Solaris, we sometimes needed to
- build with -ldl.
- - Give a useful message when people run Tor as the wrong user,
- rather than telling them to start chowning random directories.
- - We were failing to inform the controller about new .onion streams.
- o Security bugfixes on 0.1.0.x:
- - Refuse server descriptors if the fingerprint line doesn't match
- the included identity key. Tor doesn't care, but other apps (and
- humans) might actually be trusting the fingerprint line.
- - We used to kill the circuit when we receive a relay command we
- don't recognize. Now we just drop it.
- - Start obeying our firewall options more rigorously:
- . If we can't get to a dirserver directly, try going via Tor.
- . Don't ever try to connect (as a client) to a place our
- firewall options forbid.
- . If we specify a proxy and also firewall options, obey the
- firewall options even when we're using the proxy: some proxies
- can only proxy to certain destinations.
- - Fix a bug found by Lasse Overlier: when we were making internal
- circuits (intended to be cannibalized later for rendezvous and
- introduction circuits), we were picking them so that they had
- useful exit nodes. There was no need for this, and it actually
- aids some statistical attacks.
- - Start treating internal circuits and exit circuits separately.
- It's important to keep them separate because internal circuits
- have their last hops picked like middle hops, rather than like
- exit hops. So exiting on them will break the user's expectations.
- o Bugfixes on 0.1.1.x:
- - Take out the mis-feature where we tried to detect IP address
- flapping for people with DynDNS, and chose not to upload a new
- server descriptor sometimes.
- - Try to be compatible with OpenSSL 0.9.6 again.
- - Log fix: when the controller is logging about .onion addresses,
- sometimes it didn't include the ".onion" part of the address.
- - Don't try to modify options->DirServers internally -- if the
- user didn't specify any, just add the default ones directly to
- the trusted dirserver list. This fixes a bug where people running
- controllers would use SETCONF on some totally unrelated config
- option, and Tor would start yelling at them about changing their
- DirServer lines.
- - Let the controller's redirectstream command specify a port, in
- case the controller wants to change that too.
- - When we requested a pile of server descriptors, we sometimes
- accidentally launched a duplicate request for the first one.
- - Bugfix for trackhostexits: write down the fingerprint of the
- chosen exit, not its nickname, because the chosen exit might not
- be verified.
- - When parsing foo.exit, if foo is unknown, and we are leaving
- circuits unattached, set the chosen_exit field and leave the
- address empty. This matters because controllers got confused
- otherwise.
- - Directory authorities no longer try to download server
- descriptors that they know they will reject.
- o Features and updates:
- - Replace balanced trees with hash tables: this should make stuff
- significantly faster.
- - Resume using the AES counter-mode implementation that we ship,
- rather than OpenSSL's. Ours is significantly faster.
- - Many other CPU and memory improvements.
- - Add a new config option FastFirstHopPK (on by default) so clients
- do a trivial crypto handshake for their first hop, since TLS has
- already taken care of confidentiality and authentication.
- - Add a new config option TestSocks so people can see if their
- applications are using socks4, socks4a, socks5-with-ip, or
- socks5-with-hostname. This way they don't have to keep mucking
- with tcpdump and wondering if something got cached somewhere.
- - Warn when listening on a public address for socks. I suspect a
- lot of people are setting themselves up as open socks proxies,
- and they have no idea that jerks on the Internet are using them,
- since they simply proxy the traffic into the Tor network.
- - Add "private:*" as an alias in configuration for policies. Now
- you can simplify your exit policy rather than needing to list
- every single internal or nonroutable network space.
- - Add a new controller event type that allows controllers to get
- all server descriptors that were uploaded to a router in its role
- as authoritative dirserver.
- - Start shipping socks-extensions.txt, tor-doc-unix.html,
- tor-doc-server.html, and stylesheet.css in the tarball.
- - Stop shipping tor-doc.html in the tarball.
- Changes in version 0.1.1.9-alpha - 2005-11-15
- o Usability improvements:
- - Start calling it FooListenAddress rather than FooBindAddress,
- since few of our users know what it means to bind an address
- or port.
- - Reduce clutter in server logs. We're going to try to make
- them actually usable now. New config option ProtocolWarnings that
- lets you hear about how _other Tors_ are breaking the protocol. Off
- by default.
- - Divide log messages into logging domains. Once we put some sort
- of interface on this, it will let people looking at more verbose
- log levels specify the topics they want to hear more about.
- - Make directory servers return better http 404 error messages
- instead of a generic "Servers unavailable".
- - Check for even more Windows version flags when writing the platform
- string in server descriptors, and note any we don't recognize.
- - Clean up more of the OpenSSL memory when exiting, so we can detect
- memory leaks better.
- - Make directory authorities be non-versioning, non-naming by
- default. Now we can add new directory servers without requiring
- their operators to pay close attention.
- - When logging via syslog, include the pid whenever we provide
- a log entry. Suggested by Todd Fries.
- o Performance improvements:
- - Directory servers now silently throw away new descriptors that
- haven't changed much if the timestamps are similar. We do this to
- tolerate older Tor servers that upload a new descriptor every 15
- minutes. (It seemed like a good idea at the time.)
- - Inline bottleneck smartlist functions; use fast versions by default.
- - Add a "Map from digest to void*" abstraction digestmap_t so we
- can do less hex encoding/decoding. Use it in router_get_by_digest()
- to resolve a performance bottleneck.
- - Allow tor_gzip_uncompress to extract as much as possible from
- truncated compressed data. Try to extract as many
- descriptors as possible from truncated http responses (when
- DIR_PURPOSE_FETCH_ROUTERDESC).
- - Make circ->onionskin a pointer, not a static array. moria2 was using
- 125000 circuit_t's after it had been up for a few weeks, which
- translates to 20+ megs of wasted space.
- - The private half of our EDH handshake keys are now chosen out
- of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
- o Security improvements:
- - Start making directory caches retain old routerinfos, so soon
- clients can start asking by digest of descriptor rather than by
- fingerprint of server.
- - Add half our entropy from RAND_poll in OpenSSL. This knows how
- to use egd (if present), openbsd weirdness (if present), vms/os2
- weirdness (if we ever port there), and more in the future.
- o Bugfixes on 0.1.0.x:
- - Do round-robin writes of at most 16 kB per write. This might be
- more fair on loaded Tor servers, and it might resolve our Windows
- crash bug. It might also slow things down.
- - Our TLS handshakes were generating a single public/private
- keypair for the TLS context, rather than making a new one for
- each new connections. Oops. (But we were still rotating them
- periodically, so it's not so bad.)
- - When we were cannibalizing a circuit with a particular exit
- node in mind, we weren't checking to see if that exit node was
- already present earlier in the circuit. Oops.
- - When a Tor server's IP changes (e.g. from a dyndns address),
- upload a new descriptor so clients will learn too.
- - Really busy servers were keeping enough circuits open on stable
- connections that they were wrapping around the circuit_id
- space. (It's only two bytes.) This exposed a bug where we would
- feel free to reuse a circuit_id even if it still exists but has
- been marked for close. Try to fix this bug. Some bug remains.
- - If we would close a stream early (e.g. it asks for a .exit that
- we know would refuse it) but the LeaveStreamsUnattached config
- option is set by the controller, then don't close it.
- o Bugfixes on 0.1.1.8-alpha:
- - Fix a big pile of memory leaks, some of them serious.
- - Do not try to download a routerdesc if we would immediately reject
- it as obsolete.
- - Resume inserting a newline between all router descriptors when
- generating (old style) signed directories, since our spec says
- we do.
- - When providing content-type application/octet-stream for
- server descriptors using .z, we were leaving out the
- content-encoding header. Oops. (Everything tolerated this just
- fine, but that doesn't mean we need to be part of the problem.)
- - Fix a potential seg fault in getconf and getinfo using version 1
- of the controller protocol.
- - Avoid crash: do not check whether DirPort is reachable when we
- are suppressing it because of hibernation.
- - Make --hash-password not crash on exit.
- Changes in version 0.1.1.8-alpha - 2005-10-07
- o New features (major):
- - Clients don't download or use the directory anymore. Now they
- download and use network-statuses from the trusted dirservers,
- and fetch individual server descriptors as needed from mirrors.
- See dir-spec.txt for all the gory details.
- - Be more conservative about whether to advertise our DirPort.
- The main change is to not advertise if we're running at capacity
- and either a) we could hibernate or b) our capacity is low and
- we're using a default DirPort.
- - Use OpenSSL's AES when OpenSSL has version 0.9.7 or later.
- o New features (minor):
- - Try to be smart about when to retry network-status and
- server-descriptor fetches. Still needs some tuning.
- - Stop parsing, storing, or using running-routers output (but
- mirrors still cache and serve it).
- - Consider a threshold of versioning dirservers (dirservers who have
- an opinion about which Tor versions are still recommended) before
- deciding whether to warn the user that he's obsolete.
- - Dirservers can now reject/invalidate by key and IP, with the
- config options "AuthDirInvalid" and "AuthDirReject". This is
- useful since currently we automatically list servers as running
- and usable even if we know they're jerks.
- - Provide dire warnings to any users who set DirServer; move it out
- of torrc.sample and into torrc.complete.
- - Add MyFamily to torrc.sample in the server section.
- - Add nicknames to the DirServer line, so we can refer to them
- without requiring all our users to memorize their IP addresses.
- - When we get an EOF or a timeout on a directory connection, note
- how many bytes of serverdesc we are dropping. This will help
- us determine whether it is smart to parse incomplete serverdesc
- responses.
- - Add a new function to "change pseudonyms" -- that is, to stop
- using any currently-dirty circuits for new streams, so we don't
- link new actions to old actions. Currently it's only called on
- HUP (or SIGNAL RELOAD).
- - On sighup, if UseHelperNodes changed to 1, use new circuits.
- - Start using RAND_bytes rather than RAND_pseudo_bytes from
- OpenSSL. Also, reseed our entropy every hour, not just at
- startup. And entropy in 512-bit chunks, not 160-bit chunks.
- o Fixes on 0.1.1.7-alpha:
- - Nobody ever implemented EVENT_ADDRMAP for control protocol
- version 0, so don't let version 0 controllers ask for it.
- - If you requested something with too many newlines via the
- v1 controller protocol, you could crash tor.
- - Fix a number of memory leaks, including some pretty serious ones.
- - Re-enable DirPort testing again, so Tor servers will be willing
- to advertise their DirPort if it's reachable.
- - On TLS handshake, only check the other router's nickname against
- its expected nickname if is_named is set.
- o Fixes forward-ported from 0.1.0.15:
- - Don't crash when we don't have any spare file descriptors and we
- try to spawn a dns or cpu worker.
- - Make the numbers in read-history and write-history into uint64s,
- so they don't overflow and publish negatives in the descriptor.
- o Fixes on 0.1.0.x:
- - For the OS X package's modified privoxy config file, comment
- out the "logfile" line so we don't log everything passed
- through privoxy.
- - We were whining about using socks4 or socks5-with-local-lookup
- even when it's an IP in the "virtual" range we designed exactly
- for this case.
- - We were leaking some memory every time the client changes IPs.
- - Never call free() on tor_malloc()d memory. This will help us
- use dmalloc to detect memory leaks.
- - Check for named servers when looking them up by nickname;
- warn when we'recalling a non-named server by its nickname;
- don't warn twice about the same name.
- - Try to list MyFamily elements by key, not by nickname, and warn
- if we've not heard of the server.
- - Make windows platform detection (uname equivalent) smarter.
- - It turns out sparc64 doesn't like unaligned access either.
- Changes in version 0.1.0.15 - 2005-09-23
- o Bugfixes on 0.1.0.x:
- - Reject ports 465 and 587 (spam targets) in default exit policy.
- - Don't crash when we don't have any spare file descriptors and we
- try to spawn a dns or cpu worker.
- - Get rid of IgnoreVersion undocumented config option, and make us
- only warn, never exit, when we're running an obsolete version.
- - Don't try to print a null string when your server finds itself to
- be unreachable and the Address config option is empty.
- - Make the numbers in read-history and write-history into uint64s,
- so they don't overflow and publish negatives in the descriptor.
- - Fix a minor memory leak in smartlist_string_remove().
- - We were only allowing ourselves to upload a server descriptor at
- most every 20 minutes, even if it changed earlier than that.
- - Clean up log entries that pointed to old URLs.
- Changes in version 0.1.1.7-alpha - 2005-09-14
- o Fixes on 0.1.1.6-alpha:
- - Exit servers were crashing when people asked them to make a
- connection to an address not in their exit policy.
- - Looking up a non-existent stream for a v1 control connection would
- cause a segfault.
- - Fix a seg fault if we ask a dirserver for a descriptor by
- fingerprint but he doesn't know about him.
- - SETCONF was appending items to linelists, not clearing them.
- - SETCONF SocksBindAddress killed Tor if it fails to bind. Now back
- out and refuse the setconf if it would fail.
- - Downgrade the dirserver log messages when whining about
- unreachability.
- o New features:
- - Add Peter Palfrader's check-tor script to tor/contrib/
- It lets you easily check whether a given server (referenced by
- nickname) is reachable by you.
- - Numerous changes to move towards client-side v2 directories. Not
- enabled yet.
- o Fixes on 0.1.0.x:
- - If the user gave tor an odd number of command-line arguments,
- we were silently ignoring the last one. Now we complain and fail.
- [This wins the oldest-bug prize -- this bug has been present since
- November 2002, as released in Tor 0.0.0.]
- - Do not use unaligned memory access on alpha, mips, or mipsel.
- It *works*, but is very slow, so we treat them as if it doesn't.
- - Retry directory requests if we fail to get an answer we like
- from a given dirserver (we were retrying before, but only if
- we fail to connect).
- - When writing the RecommendedVersions line, sort them first.
- - When the client asked for a rendezvous port that the hidden
- service didn't want to provide, we were sending an IP address
- back along with the end cell. Fortunately, it was zero. But stop
- that anyway.
- - Correct "your server is reachable" log entries to indicate that
- it was self-testing that told us so.
- Changes in version 0.1.1.6-alpha - 2005-09-09
- o Fixes on 0.1.1.5-alpha:
- - We broke fascistfirewall in 0.1.1.5-alpha. Oops.
- - Fix segfault in unit tests in 0.1.1.5-alpha. Oops.
- - Fix bug with tor_memmem finding a match at the end of the string.
- - Make unit tests run without segfaulting.
- - Resolve some solaris x86 compile warnings.
- - Handle duplicate lines in approved-routers files without warning.
- - Fix bug where as soon as a server refused any requests due to his
- exit policy (e.g. when we ask for localhost and he tells us that's
- 127.0.0.1 and he won't do it), we decided he wasn't obeying his
- exit policy using him for any exits.
- - Only do openssl hardware accelerator stuff if openssl version is
- at least 0.9.7.
- o New controller features/fixes:
- - Add a "RESETCONF" command so you can set config options like
- AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
- a config option in the torrc with no value, then it clears it
- entirely (rather than setting it to its default).
- - Add a "GETINFO config-file" to tell us where torrc is.
- - Avoid sending blank lines when GETINFO replies should be empty.
- - Add a QUIT command for the controller (for using it manually).
- - Fix a bug in SAVECONF that was adding default dirservers and
- other redundant entries to the torrc file.
- o Start on the new directory design:
- - Generate, publish, cache, serve new network-status format.
- - Publish individual descriptors (by fingerprint, by "all", and by
- "tell me yours").
- - Publish client and server recommended versions separately.
- - Allow tor_gzip_uncompress() to handle multiple concatenated
- compressed strings. Serve compressed groups of router
- descriptors. The compression logic here could be more
- memory-efficient.
- - Distinguish v1 authorities (all currently trusted directories)
- from v2 authorities (all trusted directories).
- - Change DirServers config line to note which dirs are v1 authorities.
- - Add configuration option "V1AuthoritativeDirectory 1" which
- moria1, moria2, and tor26 should set.
- - Remove option when getting directory cache to see whether they
- support running-routers; they all do now. Replace it with one
- to see whether caches support v2 stuff.
- o New features:
- - Dirservers now do their own external reachability testing of each
- Tor server, and only list them as running if they've been found to
- be reachable. We also send back warnings to the server's logs if
- it uploads a descriptor that we already believe is unreachable.
- - Implement exit enclaves: if we know an IP address for the
- destination, and there's a running Tor server at that address
- which allows exit to the destination, then extend the circuit to
- that exit first. This provides end-to-end encryption and end-to-end
- authentication. Also, if the user wants a .exit address or enclave,
- use 4 hops rather than 3, and cannibalize a general circ for it
- if you can.
- - Permit transitioning from ORPort=0 to ORPort!=0, and back, from the
- controller. Also, rotate dns and cpu workers if the controller
- changes options that will affect them; and initialize the dns
- worker cache tree whether or not we start out as a server.
- - Only upload a new server descriptor when options change, 18
- hours have passed, uptime is reset, or bandwidth changes a lot.
- - Check [X-]Forwarded-For headers in HTTP requests when generating
- log messages. This lets people run dirservers (and caches) behind
- Apache but still know which IP addresses are causing warnings.
- o Config option changes:
- - Replace (Fascist)Firewall* config options with a new
- ReachableAddresses option that understands address policies.
- For example, "ReachableAddresses *:80,*:443"
- - Get rid of IgnoreVersion undocumented config option, and make us
- only warn, never exit, when we're running an obsolete version.
- - Make MonthlyAccountingStart config option truly obsolete now.
- o Fixes on 0.1.0.x:
- - Reject ports 465 and 587 in the default exit policy, since
- people have started using them for spam too.
- - It turns out we couldn't bootstrap a network since we added
- reachability detection in 0.1.0.1-rc. Good thing the Tor network
- has never gone down. Add an AssumeReachable config option to let
- servers and dirservers bootstrap. When we're trying to build a
- high-uptime or high-bandwidth circuit but there aren't enough
- suitable servers, try being less picky rather than simply failing.
- - Our logic to decide if the OR we connected to was the right guy
- was brittle and maybe open to a mitm for unverified routers.
- - We weren't cannibalizing circuits correctly for
- CIRCUIT_PURPOSE_C_ESTABLISH_REND and
- CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
- build those from scratch. This should make hidden services faster.
- - Predict required circuits better, with an eye toward making hidden
- services faster on the service end.
- - Retry streams if the exit node sends back a 'misc' failure. This
- should result in fewer random failures. Also, after failing
- from resolve failed or misc, reset the num failures, so we give
- it a fair shake next time we try.
- - Clean up the rendezvous warn log msgs, and downgrade some to info.
- - Reduce severity on logs about dns worker spawning and culling.
- - When we're shutting down and we do something like try to post a
- server descriptor or rendezvous descriptor, don't complain that
- we seem to be unreachable. Of course we are, we're shutting down.
- - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
- We don't use them yet, but maybe one day our DNS resolver will be
- able to discover them.
- - Make ContactInfo mandatory for authoritative directory servers.
- - Require server descriptors to list IPv4 addresses -- hostnames
- are no longer allowed. This also fixes some potential security
- problems with people providing hostnames as their address and then
- preferentially resolving them to partition users.
- - Change log line for unreachability to explicitly suggest /etc/hosts
- as the culprit. Also make it clearer what IP address and ports we're
- testing for reachability.
- - Put quotes around user-supplied strings when logging so users are
- more likely to realize if they add bad characters (like quotes)
- to the torrc.
- - Let auth dir servers start without specifying an Address config
- option.
- - Make unit tests (and other invocations that aren't the real Tor)
- run without launching listeners, creating subdirectories, and so on.
- Changes in version 0.1.1.5-alpha - 2005-08-08
- o Bugfixes included in 0.1.0.14.
- o Bugfixes on 0.1.0.x:
- - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
- torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
- it would silently using ignore the 6668.
- Changes in version 0.1.0.14 - 2005-08-08
- o Bugfixes on 0.1.0.x:
- - Fix the other half of the bug with crypto handshakes
- (CVE-2005-2643).
- - Fix an assert trigger if you send a 'signal term' via the
- controller when it's listening for 'event info' messages.
- Changes in version 0.1.1.4-alpha - 2005-08-04
- o Bugfixes included in 0.1.0.13.
- o Features:
- - Improve tor_gettimeofday() granularity on windows.
- - Make clients regenerate their keys when their IP address changes.
- - Implement some more GETINFO goodness: expose helper nodes, config
- options, getinfo keys.
- Changes in version 0.1.0.13 - 2005-08-04
- o Bugfixes on 0.1.0.x:
- - Fix a critical bug in the security of our crypto handshakes.
- - Fix a size_t underflow in smartlist_join_strings2() that made
- it do bad things when you hand it an empty smartlist.
- - Fix Windows installer to ship Tor license (thanks to Aphex for
- pointing out this oversight) and put a link to the doc directory
- in the start menu.
- - Explicitly set no-unaligned-access for sparc: it turns out the
- new gcc's let you compile broken code, but that doesn't make it
- not-broken.
- Changes in version 0.1.1.3-alpha - 2005-07-23
- o Bugfixes on 0.1.1.2-alpha:
- - Fix a bug in handling the controller's "post descriptor"
- function.
- - Fix several bugs in handling the controller's "extend circuit"
- function.
- - Fix a bug in handling the controller's "stream status" event.
- - Fix an assert failure if we have a controller listening for
- circuit events and we go offline.
- - Re-allow hidden service descriptors to publish 0 intro points.
- - Fix a crash when generating your hidden service descriptor if
- you don't have enough intro points already.
- o New features on 0.1.1.2-alpha:
- - New controller function "getinfo accounting", to ask how
- many bytes we've used in this time period.
- - Experimental support for helper nodes: a lot of the risk from
- a small static adversary comes because users pick new random
- nodes every time they rebuild a circuit. Now users will try to
- stick to the same small set of entry nodes if they can. Not
- enabled by default yet.
- o Bugfixes on 0.1.0.12:
- - If you're an auth dir server, always publish your dirport,
- even if you haven't yet found yourself to be reachable.
- - Fix a size_t underflow in smartlist_join_strings2() that made
- it do bad things when you hand it an empty smartlist.
- Changes in version 0.1.0.12 - 2005-07-18
- o New directory servers:
- - tor26 has changed IP address.
- o Bugfixes on 0.1.0.x:
- - Fix a possible double-free in tor_gzip_uncompress().
- - When --disable-threads is set, do not search for or link against
- pthreads libraries.
- - Don't trigger an assert if an authoritative directory server
- claims its dirport is 0.
- - Fix bug with removing Tor as an NT service: some people were
- getting "The service did not return an error." Thanks to Matt
- Edman for the fix.
- Changes in version 0.1.1.2-alpha - 2005-07-15
- o New directory servers:
- - tor26 has changed IP address.
- o Bugfixes on 0.1.0.x, crashes/leaks:
- - Port the servers-not-obeying-their-exit-policies fix from
- 0.1.0.11.
- - Fix an fd leak in start_daemon().
- - On Windows, you can't always reopen a port right after you've
- closed it. So change retry_listeners() to only close and re-open
- ports that have changed.
- - Fix a possible double-free in tor_gzip_uncompress().
- o Bugfixes on 0.1.0.x, usability:
- - When tor_socketpair() fails in Windows, give a reasonable
- Windows-style errno back.
- - Let people type "tor --install" as well as "tor -install" when
- they
- want to make it an NT service.
- - NT service patch from Matt Edman to improve error messages.
- - When the controller asks for a config option with an abbreviated
- name, give the full name in our response.
- - Correct the man page entry on TrackHostExitsExpire.
- - Looks like we were never delivering deflated (i.e. compressed)
- running-routers lists, even when asked. Oops.
- - When --disable-threads is set, do not search for or link against
- pthreads libraries.
- o Bugfixes on 0.1.1.x:
- - Fix a seg fault with autodetecting which controller version is
- being used.
- o Features:
- - New hidden service descriptor format: put a version in it, and
- let people specify introduction/rendezvous points that aren't
- in "the directory" (which is subjective anyway).
- - Allow the DEBUG controller event to work again. Mark certain log
- entries as "don't tell this to controllers", so we avoid cycles.
- Changes in version 0.1.0.11 - 2005-06-30
- o Bugfixes on 0.1.0.x:
- - Fix major security bug: servers were disregarding their
- exit policies if clients behaved unexpectedly.
- - Make OS X init script check for missing argument, so we don't
- confuse users who invoke it incorrectly.
- - Fix a seg fault in "tor --hash-password foo".
- - The MAPADDRESS control command was broken.
- Changes in version 0.1.1.1-alpha - 2005-06-29
- o Bugfixes:
- - Make OS X init script check for missing argument, so we don't
- confuse users who invoke it incorrectly.
- - Fix a seg fault in "tor --hash-password foo".
- - Fix a possible way to DoS dirservers.
- - When we complain that your exit policy implicitly allows local or
- private address spaces, name them explicitly so operators can
- fix it.
- - Make the log message less scary when all the dirservers are
- temporarily unreachable.
- - We were printing the number of idle dns workers incorrectly when
- culling them.
- o Features:
- - Revised controller protocol (version 1) that uses ascii rather
- than binary. Add supporting libraries in python and java so you
- can use the controller from your applications without caring how
- our protocol works.
- - Spiffy new support for crypto hardware accelerators. Can somebody
- test this?
- Changes in version 0.0.9.10 - 2005-06-16
- o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
- - Refuse relay cells that claim to have a length larger than the
- maximum allowed. This prevents a potential attack that could read
- arbitrary memory (e.g. keys) from an exit server's process
- (CVE-2005-2050).
- Changes in version 0.1.0.10 - 2005-06-14
- o Allow a few EINVALs from libevent before dying. Warn on kqueue with
- libevent before 1.1a.
- Changes in version 0.1.0.9-rc - 2005-06-09
- o Bugfixes:
- - Reset buf->highwater every time buf_shrink() is called, not just on
- a successful shrink. This was causing significant memory bloat.
- - Fix buffer overflow when checking hashed passwords.
- - Security fix: if seeding the RNG on Win32 fails, quit.
- - Allow seeding the RNG on Win32 even when you're not running as
- Administrator.
- - Disable threading on Solaris too. Something is wonky with it,
- cpuworkers, and reentrant libs.
- - Reenable the part of the code that tries to flush as soon as an
- OR outbuf has a full TLS record available. Perhaps this will make
- OR outbufs not grow as huge except in rare cases, thus saving lots
- of CPU time plus memory.
- - Reject malformed .onion addresses rather then passing them on as
- normal web requests.
- - Adapt patch from Adam Langley: fix possible memory leak in
- tor_lookup_hostname().
- - Initialize libevent later in the startup process, so the logs are
- already established by the time we start logging libevent warns.
- - Use correct errno on win32 if libevent fails.
- - Check and warn about known-bad/slow libevent versions.
- - Pay more attention to the ClientOnly config option.
- - Have torctl.in/tor.sh.in check for location of su binary (needed
- on FreeBSD)
- - Correct/add man page entries for LongLivedPorts, ExitPolicy,
- KeepalivePeriod, ClientOnly, NoPublish, HttpProxy, HttpsProxy,
- HttpProxyAuthenticator
- - Stop warning about sigpipes in the logs. We're going to
- pretend that getting these occasionally is normal and fine.
- - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in
- certain
- installer screens; and don't put stuff into StartupItems unless
- the user asks you to.
- - Require servers that use the default dirservers to have public IP
- addresses. We have too many servers that are configured with private
- IPs and their admins never notice the log entries complaining that
- their descriptors are being rejected.
- - Add OSX uninstall instructions. An actual uninstall script will
- come later.
- Changes in version 0.1.0.8-rc - 2005-05-23
- o Bugfixes:
- - It turns out that kqueue on OS X 10.3.9 was causing kernel
- panics. Disable kqueue on all OS X Tors.
- - Fix RPM: remove duplicate line accidentally added to the rpm
- spec file.
- - Disable threads on openbsd too, since its gethostaddr is not
- reentrant either.
- - Tolerate libevent 0.8 since it still works, even though it's
- ancient.
- - Enable building on Red Hat 9.0 again.
- - Allow the middle hop of the testing circuit to be running any
- version, now that most of them have the bugfix to let them connect
- to unknown servers. This will allow reachability testing to work
- even when 0.0.9.7-0.0.9.9 become obsolete.
- - Handle relay cells with rh.length too large. This prevents
- a potential attack that could read arbitrary memory (maybe even
- keys) from the exit server's process.
- - We screwed up the dirport reachability testing when we don't yet
- have a cached version of the directory. Hopefully now fixed.
- - Clean up router_load_single_router() (used by the controller),
- so it doesn't seg fault on error.
- - Fix a minor memory leak when somebody establishes an introduction
- point at your Tor server.
- - If a socks connection ends because read fails, don't warn that
- you're not sending a socks reply back.
- o Features:
- - Add HttpProxyAuthenticator config option too, that works like
- the HttpsProxyAuthenticator config option.
- - Encode hashed controller passwords in hex instead of base64,
- to make it easier to write controllers.
- Changes in version 0.1.0.7-rc - 2005-05-17
- o Bugfixes:
- - Fix a bug in the OS X package installer that prevented it from
- installing on Tiger.
- - Fix a script bug in the OS X package installer that made it
- complain during installation.
- - Find libevent even if it's hiding in /usr/local/ and your
- CFLAGS and LDFLAGS don't tell you to look there.
- - Be able to link with libevent as a shared library (the default
- after 1.0d), even if it's hiding in /usr/local/lib and even
- if you haven't added /usr/local/lib to your /etc/ld.so.conf,
- assuming you're running gcc. Otherwise fail and give a useful
- error message.
- - Fix a bug in the RPM packager: set home directory for _tor to
- something more reasonable when first installing.
- - Free a minor amount of memory that is still reachable on exit.
- Changes in version 0.1.0.6-rc - 2005-05-14
- o Bugfixes:
- - Implement --disable-threads configure option. Disable threads on
- netbsd by default, because it appears to have no reentrant resolver
- functions.
- - Apple's OS X 10.4.0 ships with a broken kqueue. The new libevent
- release (1.1) detects and disables kqueue if it's broken.
- - Append default exit policy before checking for implicit internal
- addresses. Now we don't log a bunch of complaints on startup
- when using the default exit policy.
- - Some people were putting "Address " in their torrc, and they had
- a buggy resolver that resolved " " to 0.0.0.0. Oops.
- - If DataDir is ~/.tor, and that expands to /.tor, then default to
- LOCALSTATEDIR/tor instead.
- - Fix fragmented-message bug in TorControl.py.
- - Resolve a minor bug which would prevent unreachable dirports
- from getting suppressed in the published descriptor.
- - When the controller gave us a new descriptor, we weren't resolving
- it immediately, so Tor would think its address was 0.0.0.0 until
- we fetched a new directory.
- - Fix an uppercase/lowercase case error in suppressing a bogus
- libevent warning on some Linuxes.
- o Features:
- - Begin scrubbing sensitive strings from logs by default. Turn off
- the config option SafeLogging if you need to do debugging.
- - Switch to a new buffer management algorithm, which tries to avoid
- reallocing and copying quite as much. In first tests it looks like
- it uses *more* memory on average, but less cpu.
- - First cut at support for "create-fast" cells. Clients can use
- these when extending to their first hop, since the TLS already
- provides forward secrecy and authentication. Not enabled on
- clients yet.
- - When dirservers refuse a router descriptor, we now log its
- contactinfo, platform, and the poster's IP address.
- - Call tor_free_all instead of connections_free_all after forking, to
- save memory on systems that need to fork.
- - Whine at you if you're a server and you don't set your contactinfo.
- - Implement --verify-config command-line option to check if your torrc
- is valid without actually launching Tor.
- - Rewrite address "serifos.exit" to "localhost.serifos.exit"
- rather than just rejecting it.
- Changes in version 0.1.0.5-rc - 2005-04-27
- o Bugfixes:
- - Stop trying to print a null pointer if an OR conn fails because
- we didn't like its cert.
- o Features:
- - Switch our internal buffers implementation to use a ring buffer,
- to hopefully improve performance for fast servers a lot.
- - Add HttpsProxyAuthenticator support (basic auth only), based
- on patch from Adam Langley.
- - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
- the fast servers that have been joining lately.
- - Give hidden service accesses extra time on the first attempt,
- since 60 seconds is often only barely enough. This might improve
- robustness more.
- - Improve performance for dirservers: stop re-parsing the whole
- directory every time you regenerate it.
- - Add more debugging info to help us find the weird dns freebsd
- pthreads bug; cleaner debug messages to help track future issues.
- Changes in version 0.0.9.9 - 2005-04-23
- o Bugfixes on 0.0.9.x:
- - If unofficial Tor clients connect and send weird TLS certs, our
- Tor server triggers an assert. This release contains a minimal
- backport from the broader fix that we put into 0.1.0.4-rc.
- Changes in version 0.1.0.4-rc - 2005-04-23
- o Bugfixes:
- - If unofficial Tor clients connect and send weird TLS certs, our
- Tor server triggers an assert. Stop asserting, and start handling
- TLS errors better in other situations too.
- - When the controller asks us to tell it about all the debug-level
- logs, it turns out we were generating debug-level logs while
- telling it about them, which turns into a bad loop. Now keep
- track of whether you're sending a debug log to the controller,
- and don't log when you are.
- - Fix the "postdescriptor" feature of the controller interface: on
- non-complete success, only say "done" once.
- o Features:
- - Clients are now willing to load balance over up to 2mB, not 1mB,
- of advertised bandwidth capacity.
- - Add a NoPublish config option, so you can be a server (e.g. for
- testing running Tor servers in other Tor networks) without
- publishing your descriptor to the primary dirservers.
- Changes in version 0.1.0.3-rc - 2005-04-08
- o Improvements on 0.1.0.2-rc:
- - Client now retries when streams end early for 'hibernating' or
- 'resource limit' reasons, rather than failing them.
- - More automated handling for dirserver operators:
- - Automatically approve nodes running 0.1.0.2-rc or later,
- now that the the reachability detection stuff is working.
- - Now we allow two unverified servers with the same nickname
- but different keys. But if a nickname is verified, only that
- nickname+key are allowed.
- - If you're an authdirserver connecting to an address:port,
- and it's not the OR you were expecting, forget about that
- descriptor. If he *was* the one you were expecting, then forget
- about all other descriptors for that address:port.
- - Allow servers to publish descriptors from 12 hours in the future.
- Corollary: only whine about clock skew from the dirserver if
- he's a trusted dirserver (since now even verified servers could
- have quite wrong clocks).
- - Adjust maximum skew and age for rendezvous descriptors: let skew
- be 48 hours rather than 90 minutes.
- - Efficiency improvements:
- - Keep a big splay tree of (circid,orconn)->circuit mappings to make
- it much faster to look up a circuit for each relay cell.
- - Remove most calls to assert_all_pending_dns_resolves_ok(),
- since they're eating our cpu on exit nodes.
- - Stop wasting time doing a case insensitive comparison for every
- dns name every time we do any lookup. Canonicalize the names to
- lowercase and be done with it.
- - Start sending 'truncated' cells back rather than destroy cells,
- if the circuit closes in front of you. This means we won't have
- to abandon partially built circuits.
- - Only warn once per nickname from add_nickname_list_to_smartlist
- per failure, so an entrynode or exitnode choice that's down won't
- yell so much.
- - Put a note in the torrc about abuse potential with the default
- exit policy.
- - Revise control spec and implementation to allow all log messages to
- be sent to controller with their severities intact (suggested by
- Matt Edman). Update TorControl to handle new log event types.
- - Provide better explanation messages when controller's POSTDESCRIPTOR
- fails.
- - Stop putting nodename in the Platform string in server descriptors.
- It doesn't actually help, and it is confusing/upsetting some people.
- o Bugfixes on 0.1.0.2-rc:
- - We were printing the host mask wrong in exit policies in server
- descriptors. This isn't a critical bug though, since we were still
- obeying the exit policy internally.
- - Fix Tor when compiled with libevent but without pthreads: move
- connection_unregister() from _connection_free() to
- connection_free().
- - Fix an assert trigger (already fixed in 0.0.9.x): when we have
- the rare mysterious case of accepting a conn on 0.0.0.0:0, then
- when we look through the connection array, we'll find any of the
- cpu/dnsworkers. This is no good.
- o Bugfixes on 0.0.9.8:
- - Fix possible bug on threading platforms (e.g. win32) which was
- leaking a file descriptor whenever a cpuworker or dnsworker died.
- - When using preferred entry or exit nodes, ignore whether the
- circuit wants uptime or capacity. They asked for the nodes, they
- get the nodes.
- - chdir() to your datadirectory at the *end* of the daemonize process,
- not the beginning. This was a problem because the first time you
- run tor, if your datadir isn't there, and you have runasdaemon set
- to 1, it will try to chdir to it before it tries to create it. Oops.
- - Handle changed router status correctly when dirserver reloads
- fingerprint file. We used to be dropping all unverified descriptors
- right then. The bug was hidden because we would immediately
- fetch a directory from another dirserver, which would include the
- descriptors we just dropped.
- - When we're connecting to an OR and he's got a different nickname/key
- than we were expecting, only complain loudly if we're an OP or a
- dirserver. Complaining loudly to the OR admins just confuses them.
- - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
- artificially capped at 500kB.
- Changes in version 0.0.9.8 - 2005-04-07
- o Bugfixes on 0.0.9.x:
- - We have a bug that I haven't found yet. Sometimes, very rarely,
- cpuworkers get stuck in the 'busy' state, even though the cpuworker
- thinks of itself as idle. This meant that no new circuits ever got
- established. Here's a workaround to kill any cpuworker that's been
- busy for more than 100 seconds.
- Changes in version 0.1.0.2-rc - 2005-04-01
- o Bugfixes on 0.1.0.1-rc:
- - Fixes on reachability detection:
- - Don't check for reachability while hibernating.
- - If ORPort is reachable but DirPort isn't, still publish the
- descriptor, but zero out DirPort until it's found reachable.
- - When building testing circs for ORPort testing, use only
- high-bandwidth nodes, so fewer circuits fail.
- - Complain about unreachable ORPort separately from unreachable
- DirPort, so the user knows what's going on.
- - Make sure we only conclude ORPort reachability if we didn't
- initiate the conn. Otherwise we could falsely conclude that
- we're reachable just because we connected to the guy earlier
- and he used that same pipe to extend to us.
- - Authdirservers shouldn't do ORPort reachability detection,
- since they're in clique mode, so it will be rare to find a
- server not already connected to them.
- - When building testing circuits, always pick middle hops running
- Tor 0.0.9.7, so we avoid the "can't extend to unknown routers"
- bug. (This is a kludge; it will go away when 0.0.9.x becomes
- obsolete.)
- - When we decide we're reachable, actually publish our descriptor
- right then.
- - Fix bug in redirectstream in the controller.
- - Fix the state descriptor strings so logs don't claim edge streams
- are in a different state than they actually are.
- - Use recent libevent features when possible (this only really affects
- win32 and osx right now, because the new libevent with these
- features hasn't been released yet). Add code to suppress spurious
- libevent log msgs.
- - Prevent possible segfault in connection_close_unattached_ap().
- - Fix newlines on torrc in win32.
- - Improve error msgs when tor-resolve fails.
- o Improvements on 0.0.9.x:
- - New experimental script tor/contrib/ExerciseServer.py (needs more
- work) that uses the controller interface to build circuits and
- fetch pages over them. This will help us bootstrap servers that
- have lots of capacity but haven't noticed it yet.
- - New experimental script tor/contrib/PathDemo.py (needs more work)
- that uses the controller interface to let you choose whole paths
- via addresses like
- "<hostname>.<path,separated by dots>.<length of path>.path"
- - When we've connected to an OR and handshaked but didn't like
- the result, we were closing the conn without sending destroy
- cells back for pending circuits. Now send those destroys.
- Changes in version 0.0.9.7 - 2005-04-01
- o Bugfixes on 0.0.9.x:
- - Fix another race crash bug (thanks to Glenn Fink for reporting).
- - Compare identity to identity, not to nickname, when extending to
- a router not already in the directory. This was preventing us from
- extending to unknown routers. Oops.
- - Make sure to create OS X Tor user in <500 range, so we aren't
- creating actual system users.
- - Note where connection-that-hasn't-sent-end was marked, and fix
- a few really loud instances of this harmless bug (it's fixed more
- in 0.1.0.x).
- Changes in version 0.1.0.1-rc - 2005-03-28
- o New features:
- - Add reachability testing. Your Tor server will automatically try
- to see if its ORPort and DirPort are reachable from the outside,
- and it won't upload its descriptor until it decides they are.
- - Handle unavailable hidden services better. Handle slow or busy
- hidden services better.
- - Add support for CONNECTing through https proxies, with "HttpsProxy"
- config option.
- - New exit policy: accept most low-numbered ports, rather than
- rejecting most low-numbered ports.
- - More Tor controller support (still experimental). See
- http://tor.eff.org/doc/control-spec.txt for all the new features,
- including signals to emulate unix signals from any platform;
- redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
- closestream; closecircuit; etc.
- - Make nt services work and start on startup on win32 (based on
- patch by Matt Edman).
- - Add a new AddressMap config directive to rewrite incoming socks
- addresses. This lets you, for example, declare an implicit
- required exit node for certain sites.
- - Add a new TrackHostExits config directive to trigger addressmaps
- for certain incoming socks addresses -- for sites that break when
- your exit keeps changing (based on patch by Mike Perry).
- - Redo the client-side dns cache so it's just an addressmap too.
- - Notice when our IP changes, and reset stats/uptime/reachability.
- - When an application is using socks5, give him the whole variety of
- potential socks5 responses (connect refused, host unreachable, etc),
- rather than just "success" or "failure".
- - A more sane version numbering system. See
- http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
- - New contributed script "exitlist": a simple python script to
- parse directories and find Tor nodes that exit to listed
- addresses/ports.
- - New contributed script "privoxy-tor-toggle" to toggle whether
- Privoxy uses Tor. Seems to be configured for Debian by default.
- - Report HTTP reasons to client when getting a response from directory
- servers -- so you can actually know what went wrong.
- - New config option MaxAdvertisedBandwidth which lets you advertise
- a low bandwidthrate (to not attract as many circuits) while still
- allowing a higher bandwidthrate in reality.
- o Robustness/stability fixes:
- - Make Tor use Niels Provos's libevent instead of its current
- poll-but-sometimes-select mess. This will let us use faster async
- cores (like epoll, kpoll, and /dev/poll), and hopefully work better
- on Windows too.
- - pthread support now too. This was forced because when we forked,
- we ended up wasting a lot of duplicate ram over time. Also switch
- to foo_r versions of some library calls to allow reentry and
- threadsafeness.
- - Better handling for heterogeneous / unreliable nodes:
- - Annotate circuits w/ whether they aim to contain high uptime nodes
- and/or high capacity nodes. When building circuits, choose
- appropriate nodes.
- - This means that every single node in an intro rend circuit,
- not just the last one, will have a minimum uptime.
- - New config option LongLivedPorts to indicate application streams
- that will want high uptime circuits.
- - Servers reset uptime when a dir fetch entirely fails. This
- hopefully reflects stability of the server's network connectivity.
- - If somebody starts his tor server in Jan 2004 and then fixes his
- clock, don't make his published uptime be a year.
- - Reset published uptime when you wake up from hibernation.
- - Introduce a notion of 'internal' circs, which are chosen without
- regard to the exit policy of the last hop. Intro and rendezvous
- circs must be internal circs, to avoid leaking information. Resolve
- and connect streams can use internal circs if they want.
- - New circuit pooling algorithm: make sure to have enough circs around
- to satisfy any predicted ports, and also make sure to have 2 internal
- circs around if we've required internal circs lately (and with high
- uptime if we've seen that lately too).
- - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
- which describes how often we retry making new circuits if current
- ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
- how long we're willing to make use of an already-dirty circuit.
- - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
- circ as necessary, if there are any completed ones lying around
- when we try to launch one.
- - Make hidden services try to establish a rendezvous for 30 seconds,
- rather than for n (where n=3) attempts to build a circuit.
- - Change SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to a config option
- "ShutdownWaitLength".
- - Try to be more zealous about calling connection_edge_end when
- things go bad with edge conns in connection.c.
- - Revise tor-spec to add more/better stream end reasons.
- - Revise all calls to connection_edge_end to avoid sending "misc",
- and to take errno into account where possible.
- o Bug fixes:
- - Fix a race condition that can trigger an assert, when we have a
- pending create cell and an OR connection fails right then.
- - Fix several double-mark-for-close bugs, e.g. where we were finding
- a conn for a cell even if that conn is already marked for close.
- - Make sequence of log messages when starting on win32 with no config
- file more reasonable.
- - When choosing an exit node for a new non-internal circ, don't take
- into account whether it'll be useful for any pending x.onion
- addresses -- it won't.
- - Turn addr_policy_compare from a tristate to a quadstate; this should
- help address our "Ah, you allow 1.2.3.4:80. You are a good choice
- for google.com" problem.
- - Make "platform" string in descriptor more accurate for Win32 servers,
- so it's not just "unknown platform".
- - Fix an edge case in parsing config options (thanks weasel).
- If they say "--" on the commandline, it's not an option.
- - Reject odd-looking addresses at the client (e.g. addresses that
- contain a colon), rather than having the server drop them because
- they're malformed.
- - tor-resolve requests were ignoring .exit if there was a working circuit
- they could use instead.
- - REUSEADDR on normal platforms means you can rebind to the port
- right after somebody else has let it go. But REUSEADDR on win32
- means to let you bind to the port _even when somebody else
- already has it bound_! So, don't do that on Win32.
- - Change version parsing logic: a version is "obsolete" if it is not
- recommended and (1) there is a newer recommended version in the
- same series, or (2) there are no recommended versions in the same
- series, but there are some recommended versions in a newer series.
- A version is "new" if it is newer than any recommended version in
- the same series.
- - Stop most cases of hanging up on a socks connection without sending
- the socks reject.
- o Helpful fixes:
- - Require BandwidthRate to be at least 20kB/s for servers.
- - When a dirserver causes you to give a warn, mention which dirserver
- it was.
- - New config option DirAllowPrivateAddresses for authdirservers.
- Now by default they refuse router descriptors that have non-IP or
- private-IP addresses.
- - Stop publishing socksport in the directory, since it's not
- actually meant to be public. For compatibility, publish a 0 there
- for now.
- - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
- smart" value, that is low for servers and high for clients.
- - If our clock jumps forward by 100 seconds or more, assume something
- has gone wrong with our network and abandon all not-yet-used circs.
- - Warn when exit policy implicitly allows local addresses.
- - If we get an incredibly skewed timestamp from a dirserver mirror
- that isn't a verified OR, don't warn -- it's probably him that's
- wrong.
- - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
- cookies to disk and doesn't log each web request to disk. (Thanks
- to Brett Carrington for pointing this out.)
- - When a client asks us for a dir mirror and we don't have one,
- launch an attempt to get a fresh one.
- - If we're hibernating and we get a SIGINT, exit immediately.
- - Add --with-dmalloc ./configure option, to track memory leaks.
- - And try to free all memory on closing, so we can detect what
- we're leaking.
- - Cache local dns resolves correctly even when they're .exit
- addresses.
- - Give a better warning when some other server advertises an
- ORPort that is actually an apache running ssl.
- - Add "opt hibernating 1" to server descriptor to make it clearer
- whether the server is hibernating.
- Changes in version 0.0.9.6 - 2005-03-24
- o Bugfixes on 0.0.9.x (crashes and asserts):
- - Add new end stream reasons to maintenance branch. Fix bug where
- reason (8) could trigger an assert. Prevent bug from recurring.
- - Apparently win32 stat wants paths to not end with a slash.
- - Fix assert triggers in assert_cpath_layer_ok(), where we were
- blowing away the circuit that conn->cpath_layer points to, then
- checking to see if the circ is well-formed. Backport check to make
- sure we dont use the cpath on a closed connection.
- - Prevent circuit_resume_edge_reading_helper() from trying to package
- inbufs for marked-for-close streams.
- - Don't crash on hup if your options->address has become unresolvable.
- - Some systems (like OS X) sometimes accept() a connection and tell
- you the remote host is 0.0.0.0:0. If this happens, due to some
- other mis-features, we get confused; so refuse the conn for now.
- o Bugfixes on 0.0.9.x (other):
- - Fix harmless but scary "Unrecognized content encoding" warn message.
- - Add new stream error reason: TORPROTOCOL reason means "you are not
- speaking a version of Tor I understand; say bye-bye to your stream."
- - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
- into the future, now that we are more tolerant of skew. This
- resolves a bug where a Tor server would refuse to cache a directory
- because all the directories it gets are too far in the future;
- yet the Tor server never logs any complaints about clock skew.
- - Mac packaging magic: make man pages useable, and do not overwrite
- existing torrc files.
- - Make OS X log happily to /var/log/tor/tor.log
- Changes in version 0.0.9.5 - 2005-02-22
- o Bugfixes on 0.0.9.x:
- - Fix an assert race at exit nodes when resolve requests fail.
- - Stop picking unverified dir mirrors--it only leads to misery.
- - Patch from Matt Edman to make NT services work better. Service
- support is still not compiled into the executable by default.
- - Patch from Dmitri Bely so the Tor service runs better under
- the win32 SYSTEM account.
- - Make tor-resolve actually work (?) on Win32.
- - Fix a sign bug when getrlimit claims to have 4+ billion
- file descriptors available.
- - Stop refusing to start when bandwidthburst == bandwidthrate.
- - When create cells have been on the onion queue more than five
- seconds, just send back a destroy and take them off the list.
- Changes in version 0.0.9.4 - 2005-02-03
- o Bugfixes on 0.0.9:
- - Fix an assert bug that took down most of our servers: when
- a server claims to have 1 GB of bandwidthburst, don't
- freak out.
- - Don't crash as badly if we have spawned the max allowed number
- of dnsworkers, or we're out of file descriptors.
- - Block more file-sharing ports in the default exit policy.
- - MaxConn is now automatically set to the hard limit of max
- file descriptors we're allowed (ulimit -n), minus a few for
- logs, etc.
- - Give a clearer message when servers need to raise their
- ulimit -n when they start running out of file descriptors.
- - SGI Compatibility patches from Jan Schaumann.
- - Tolerate a corrupt cached directory better.
- - When a dirserver hasn't approved your server, list which one.
- - Go into soft hibernation after 95% of the bandwidth is used,
- not 99%. This is especially important for daily hibernators who
- have a small accounting max. Hopefully it will result in fewer
- cut connections when the hard hibernation starts.
- - Load-balance better when using servers that claim more than
- 800kB/s of capacity.
- - Make NT services work (experimental, only used if compiled in).
- Changes in version 0.0.9.3 - 2005-01-21
- o Bugfixes on 0.0.9:
- - Backport the cpu use fixes from main branch, so busy servers won't
- need as much processor time.
- - Work better when we go offline and then come back, or when we
- run Tor at boot before the network is up. We do this by
- optimistically trying to fetch a new directory whenever an
- application request comes in and we think we're offline -- the
- human is hopefully a good measure of when the network is back.
- - Backport some minimal hidserv bugfixes: keep rend circuits open as
- long as you keep using them; actually publish hidserv descriptors
- shortly after they change, rather than waiting 20-40 minutes.
- - Enable Mac startup script by default.
- - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
- - When you update AllowUnverifiedNodes or FirewallPorts via the
- controller's setconf feature, we were always appending, never
- resetting.
- - When you update HiddenServiceDir via setconf, it was screwing up
- the order of reading the lines, making it fail.
- - Do not rewrite a cached directory back to the cache; otherwise we
- will think it is recent and not fetch a newer one on startup.
- - Workaround for webservers that lie about Content-Encoding: Tor
- now tries to autodetect compressed directories and compression
- itself. This lets us Proxypass dir fetches through apache.
- Changes in version 0.0.9.2 - 2005-01-04
- o Bugfixes on 0.0.9 (crashes and asserts):
- - Fix an assert on startup when the disk is full and you're logging
- to a file.
- - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
- style address, then we'd crash.
- - Fix an assert trigger when the running-routers string we get from
- a dirserver is broken.
- - Make worker threads start and run on win32. Now win32 servers
- may work better.
- - Bandaid (not actually fix, but now it doesn't crash) an assert
- where the dns worker dies mysteriously and the main Tor process
- doesn't remember anything about the address it was resolving.
- o Bugfixes on 0.0.9 (Win32):
- - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
- name out of the warning/assert messages.
- - Fix a superficial "unhandled error on read" bug on win32.
- - The win32 installer no longer requires a click-through for our
- license, since our Free Software license grants rights but does not
- take any away.
- - Win32: When connecting to a dirserver fails, try another one
- immediately. (This was already working for non-win32 Tors.)
- - Stop trying to parse $HOME on win32 when hunting for default
- DataDirectory.
- - Make tor-resolve.c work on win32 by calling network_init().
- o Bugfixes on 0.0.9 (other):
- - Make 0.0.9.x build on Solaris again.
- - Due to a fencepost error, we were blowing away the \n when reporting
- confvalue items in the controller. So asking for multiple config
- values at once couldn't work.
- - When listing circuits that are pending on an opening OR connection,
- if we're an OR we were listing circuits that *end* at us as
- being pending on every listener, dns/cpu worker, etc. Stop that.
- - Dirservers were failing to create 'running-routers' or 'directory'
- strings if we had more than some threshold of routers. Fix them so
- they can handle any number of routers.
- - Fix a superficial "Duplicate mark for close" bug.
- - Stop checking for clock skew for OR connections, even for servers.
- - Fix a fencepost error that was chopping off the last letter of any
- nickname that is the maximum allowed nickname length.
- - Update URLs in log messages so they point to the new website.
- - Fix a potential problem in mangling server private keys while
- writing to disk (not triggered yet, as far as we know).
- - Include the licenses for other free software we include in Tor,
- now that we're shipping binary distributions more regularly.
- Changes in version 0.0.9.1 - 2004-12-15
- o Bugfixes on 0.0.9:
- - Make hibernation actually work.
- - Make HashedControlPassword config option work.
- - When we're reporting event circuit status to a controller,
- don't use the stream status code.
- Changes in version 0.0.9 - 2004-12-12
- o Cleanups:
- - Clean up manpage and torrc.sample file.
- - Clean up severities and text of log warnings.
- o Mistakes:
- - Make servers trigger an assert when they enter hibernation.
- Changes in version 0.0.9rc7 - 2004-12-08
- o Bugfixes on 0.0.9rc:
- - Fix a stack-trashing crash when an exit node begins hibernating.
- - Avoid looking at unallocated memory while considering which
- ports we need to build circuits to cover.
- - Stop a sigpipe: when an 'end' cell races with eof from the app,
- we shouldn't hold-open-until-flush if the eof arrived first.
- - Fix a bug with init_cookie_authentication() in the controller.
- - When recommending new-format log lines, if the upper bound is
- LOG_ERR, leave it implicit.
- o Bugfixes on 0.0.8.1:
- - Fix a whole slew of memory leaks.
- - Fix isspace() and friends so they still make Solaris happy
- but also so they don't trigger asserts on win32.
- - Fix parse_iso_time on platforms without strptime (eg win32).
- - win32: tolerate extra "readable" events better.
- - win32: when being multithreaded, leave parent fdarray open.
- - Make unit tests work on win32.
- Changes in version 0.0.9rc6 - 2004-12-06
- o Bugfixes on 0.0.9pre:
- - Clean up some more integer underflow opportunities (not exploitable
- we think).
- - While hibernating, hup should not regrow our listeners.
- - Send an end to the streams we close when we hibernate, rather
- than just chopping them off.
- - React to eof immediately on non-open edge connections.
- o Bugfixes on 0.0.8.1:
- - Calculate timeout for waiting for a connected cell from the time
- we sent the begin cell, not from the time the stream started. If
- it took a long time to establish the circuit, we would time out
- right after sending the begin cell.
- - Fix router_compare_addr_to_addr_policy: it was not treating a port
- of * as always matching, so we were picking reject *:* nodes as
- exit nodes too. Oops.
- o Features:
- - New circuit building strategy: keep a list of ports that we've
- used in the past 6 hours, and always try to have 2 circuits open
- or on the way that will handle each such port. Seed us with port
- 80 so web users won't complain that Tor is "slow to start up".
- - Make kill -USR1 dump more useful stats about circuits.
- - When warning about retrying or giving up, print the address, so
- the user knows which one it's talking about.
- - If you haven't used a clean circuit in an hour, throw it away,
- just to be on the safe side. (This means after 6 hours a totally
- unused Tor client will have no circuits open.)
- Changes in version 0.0.9rc5 - 2004-12-01
- o Bugfixes on 0.0.8.1:
- - Disallow NDEBUG. We don't ever want anybody to turn off debug.
- - Let resolve conns retry/expire also, rather than sticking around
- forever.
- - If we are using select, make sure we stay within FD_SETSIZE.
- o Bugfixes on 0.0.9pre:
- - Fix integer underflow in tor_vsnprintf() that may be exploitable,
- but doesn't seem to be currently; thanks to Ilja van Sprundel for
- finding it.
- - If anybody set DirFetchPostPeriod, give them StatusFetchPeriod
- instead. Impose minima and maxima for all *Period options; impose
- even tighter maxima for fetching if we are a caching dirserver.
- Clip rather than rejecting.
- - Fetch cached running-routers from servers that serve it (that is,
- authdirservers and servers running 0.0.9rc5-cvs or later.)
- o Features:
- - Accept *:706 (silc) in default exit policy.
- - Implement new versioning format for post 0.1.
- - Support "foo.nickname.exit" addresses, to let Alice request the
- address "foo" as viewed by exit node "nickname". Based on a patch
- by Geoff Goodell.
- - Make tor --version --version dump the cvs Id of every file.
- Changes in version 0.0.9rc4 - 2004-11-28
- o Bugfixes on 0.0.8.1:
- - Make windows sockets actually non-blocking (oops), and handle
- win32 socket errors better.
- o Bugfixes on 0.0.9rc1:
- - Actually catch the -USR2 signal.
- Changes in version 0.0.9rc3 - 2004-11-25
- o Bugfixes on 0.0.8.1:
- - Flush the log file descriptor after we print "Tor opening log file",
- so we don't see those messages days later.
- o Bugfixes on 0.0.9rc1:
- - Make tor-resolve work again.
- - Avoid infinite loop in tor-resolve if tor hangs up on it.
- - Fix an assert trigger for clients/servers handling resolves.
- Changes in version 0.0.9rc2 - 2004-11-24
- o Bugfixes on 0.0.9rc1:
- - I broke socks5 support while fixing the eof bug.
- - Allow unitless bandwidths and intervals; they default to bytes
- and seconds.
- - New servers don't start out hibernating; they are active until
- they run out of bytes, so they have a better estimate of how
- long it takes, and so their operators can know they're working.
- Changes in version 0.0.9rc1 - 2004-11-23
- o Bugfixes on 0.0.8.1:
- - Finally fix a bug that's been plaguing us for a year:
- With high load, circuit package window was reaching 0. Whenever
- we got a circuit-level sendme, we were reading a lot on each
- socket, but only writing out a bit. So we would eventually reach
- eof. This would be noticed and acted on even when there were still
- bytes sitting in the inbuf.
- - When poll() is interrupted, we shouldn't believe the revents values.
- o Bugfixes on 0.0.9pre6:
- - Fix hibernate bug that caused pre6 to be broken.
- - Don't keep rephist info for routers that haven't had activity for
- 24 hours. (This matters now that clients have keys, since we track
- them too.)
- - Never call close_temp_logs while validating log options.
- - Fix backslash-escaping on tor.sh.in and torctl.in.
- o Features:
- - Implement weekly/monthly/daily accounting: now you specify your
- hibernation properties by
- AccountingMax N bytes|KB|MB|GB|TB
- AccountingStart day|week|month [day] HH:MM
- Defaults to "month 1 0:00".
- - Let bandwidth and interval config options be specified as 5 bytes,
- kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
- - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
- get back to normal.)
- - If your requested entry or exit node has advertised bandwidth 0,
- pick it anyway.
- - Be more greedy about filling up relay cells -- we try reading again
- once we've processed the stuff we read, in case enough has arrived
- to fill the last cell completely.
- - Apply NT service patch from Osamu Fujino. Still needs more work.
- Changes in version 0.0.9pre6 - 2004-11-15
- o Bugfixes on 0.0.8.1:
- - Fix assert failure on malformed socks4a requests.
- - Use identity comparison, not nickname comparison, to choose which
- half of circuit-ID-space each side gets to use. This is needed
- because sometimes we think of a router as a nickname, and sometimes
- as a hex ID, and we can't predict what the other side will do.
- - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
- write() call will fail and we handle it there.
- - Add a FAST_SMARTLIST define to optionally inline smartlist_get
- and smartlist_len, which are two major profiling offenders.
- o Bugfixes on 0.0.9pre5:
- - Fix a bug in read_all that was corrupting config files on windows.
- - When we're raising the max number of open file descriptors to
- 'unlimited', don't log that we just raised it to '-1'.
- - Include event code with events, as required by control-spec.txt.
- - Don't give a fingerprint when clients do --list-fingerprint:
- it's misleading, because it will never be the same again.
- - Stop using strlcpy in tor_strndup, since it was slowing us
- down a lot.
- - Remove warn on startup about missing cached-directory file.
- - Make kill -USR1 work again.
- - Hibernate if we start tor during the "wait for wakeup-time" phase
- of an accounting interval. Log our hibernation plans better.
- - Authoritative dirservers now also cache their directory, so they
- have it on start-up.
- o Features:
- - Fetch running-routers; cache running-routers; compress
- running-routers; serve compressed running-routers.z
- - Add NSI installer script contributed by J Doe.
- - Commit VC6 and VC7 workspace/project files.
- - Commit a tor.spec for making RPM files, with help from jbash.
- - Add contrib/torctl.in contributed by Glenn Fink.
- - Implement the control-spec's SAVECONF command, to write your
- configuration to torrc.
- - Get cookie authentication for the controller closer to working.
- - Include control-spec.txt in the tarball.
- - When set_conf changes our server descriptor, upload a new copy.
- But don't upload it too often if there are frequent changes.
- - Document authentication config in man page, and document signals
- we catch.
- - Clean up confusing parts of man page and torrc.sample.
- - Make expand_filename handle ~ and ~username.
- - Use autoconf to enable largefile support where necessary. Use
- ftello where available, since ftell can fail at 2GB.
- - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
- log more informatively.
- - Give a slightly more useful output for "tor -h".
- - Refuse application socks connections to port 0.
- - Check clock skew for verified servers, but allow unverified
- servers and clients to have any clock skew.
- - Break DirFetchPostPeriod into:
- - DirFetchPeriod for fetching full directory,
- - StatusFetchPeriod for fetching running-routers,
- - DirPostPeriod for posting server descriptor,
- - RendPostPeriod for posting hidden service descriptors.
- - Make sure the hidden service descriptors are at a random offset
- from each other, to hinder linkability.
- Changes in version 0.0.9pre5 - 2004-11-09
- o Bugfixes on 0.0.9pre4:
- - Fix a seg fault in unit tests (doesn't affect main program).
- - Fix an assert bug where a hidden service provider would fail if
- the first hop of his rendezvous circuit was down.
- - Hidden service operators now correctly handle version 1 style
- INTRODUCE1 cells (nobody generates them still, so not a critical
- bug).
- - If do_hup fails, actually notice.
- - Handle more errnos from accept() without closing the listener.
- Some OpenBSD machines were closing their listeners because
- they ran out of file descriptors.
- - Send resolve cells to exit routers that are running a new
- enough version of the resolve code to work right.
- - Better handling of winsock includes on non-MSV win32 compilers.
- - Some people had wrapped their tor client/server in a script
- that would restart it whenever it died. This did not play well
- with our "shut down if your version is obsolete" code. Now people
- don't fetch a new directory if their local cached version is
- recent enough.
- - Make our autogen.sh work on ksh as well as bash.
- o Major Features:
- - Hibernation: New config option "AccountingMaxKB" lets you
- set how many KBytes per month you want to allow your server to
- consume. Rather than spreading those bytes out evenly over the
- month, we instead hibernate for some of the month and pop up
- at a deterministic time, work until the bytes are consumed, then
- hibernate again. Config option "MonthlyAccountingStart" lets you
- specify which day of the month your billing cycle starts on.
- - Control interface: a separate program can now talk to your
- client/server over a socket, and get/set config options, receive
- notifications of circuits and streams starting/finishing/dying,
- bandwidth used, etc. The next step is to get some GUIs working.
- Let us know if you want to help out. See doc/control-spec.txt .
- - Ship a contrib/tor-control.py as an example script to interact
- with the control port.
- - "tor --hash-password zzyxz" will output a salted password for
- use in authenticating to the control interface.
- - New log format in config:
- "Log minsev[-maxsev] stdout|stderr|syslog" or
- "Log minsev[-maxsev] file /var/foo"
- o Minor Features:
- - DirPolicy config option, to let people reject incoming addresses
- from their dirserver.
- - "tor --list-fingerprint" will list your identity key fingerprint
- and then exit.
- - Add "pass" target for RedirectExit, to make it easier to break
- out of a sequence of RedirectExit rules.
- - Clients now generate a TLS cert too, in preparation for having
- them act more like real nodes.
- - Ship src/win32/ in the tarball, so people can use it to build.
- - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
- is broken.
- - New "router-status" line in directory, to better bind each verified
- nickname to its identity key.
- - Deprecate unofficial config option abbreviations, and abbreviations
- not on the command line.
- - Add a pure-C tor-resolve implementation.
- - Use getrlimit and friends to ensure we can reach MaxConn (currently
- 1024) file descriptors.
- o Code security improvements, inspired by Ilja:
- - Replace sprintf with snprintf. (I think they were all safe, but
- hey.)
- - Replace strcpy/strncpy with strlcpy in more places.
- - Avoid strcat; use snprintf or strlcat instead.
- - snprintf wrapper with consistent (though not C99) overflow behavior.
- Changes in version 0.0.9pre4 - 2004-10-17
- o Bugfixes on 0.0.9pre3:
- - If the server doesn't specify an exit policy, use the real default
- exit policy, not reject *:*.
- - Ignore fascistfirewall when uploading/downloading hidden service
- descriptors, since we go through Tor for those; and when using
- an HttpProxy, since we assume it can reach them all.
- - When looking for an authoritative dirserver, use only the ones
- configured at boot. Don't bother looking in the directory.
- - The rest of the fix for get_default_conf_file() on older win32.
- - Make 'Routerfile' config option obsolete.
- o Features:
- - New 'MyFamily nick1,...' config option for a server to
- specify other servers that shouldn't be used in the same circuit
- with it. Only believed if nick1 also specifies us.
- - New 'NodeFamily nick1,nick2,...' config option for a client to
- specify nodes that it doesn't want to use in the same circuit.
- - New 'Redirectexit pattern address:port' config option for a
- server to redirect exit connections, e.g. to a local squid.
- Changes in version 0.0.9pre3 - 2004-10-13
- o Bugfixes on 0.0.8.1:
- - Better torrc example lines for dirbindaddress and orbindaddress.
- - Improved bounds checking on parsed ints (e.g. config options and
- the ones we find in directories.)
- - Better handling of size_t vs int, so we're more robust on 64
- bit platforms.
- - Fix the rest of the bug where a newly started OR would appear
- as unverified even after we've added his fingerprint and hupped
- the dirserver.
- - Fix a bug from 0.0.7: when read() failed on a stream, we would
- close it without sending back an end. So 'connection refused'
- would simply be ignored and the user would get no response.
- o Bugfixes on 0.0.9pre2:
- - Serving the cached-on-disk directory to people is bad. We now
- provide no directory until we've fetched a fresh one.
- - Workaround for bug on windows where cached-directories get crlf
- corruption.
- - Make get_default_conf_file() work on older windows too.
- - If we write a *:* exit policy line in the descriptor, don't write
- any more exit policy lines.
- o Features:
- - Use only 0.0.9pre1 and later servers for resolve cells.
- - Make the dirservers file obsolete.
- - Include a dir-signing-key token in directories to tell the
- parsing entity which key is being used to sign.
- - Remove the built-in bulky default dirservers string.
- - New config option "Dirserver %s:%d [fingerprint]", which can be
- repeated as many times as needed. If no dirservers specified,
- default to moria1,moria2,tor26.
- - Make moria2 advertise a dirport of 80, so people behind firewalls
- will be able to get a directory.
- - Http proxy support
- - Dirservers translate requests for http://%s:%d/x to /x
- - You can specify "HttpProxy %s[:%d]" and all dir fetches will
- be routed through this host.
- - Clients ask for /tor/x rather than /x for new enough dirservers.
- This way we can one day coexist peacefully with apache.
- - Clients specify a "Host: %s%d" http header, to be compatible
- with more proxies, and so running squid on an exit node can work.
- Changes in version 0.0.8.1 - 2004-10-13
- o Bugfixes:
- - Fix a seg fault that can be triggered remotely for Tor
- clients/servers with an open dirport.
- - Fix a rare assert trigger, where routerinfos for entries in
- our cpath would expire while we're building the path.
- - Fix a bug in OutboundBindAddress so it (hopefully) works.
- - Fix a rare seg fault for people running hidden services on
- intermittent connections.
- - Fix a bug in parsing opt keywords with objects.
- - Fix a stale pointer assert bug when a stream detaches and
- reattaches.
- - Fix a string format vulnerability (probably not exploitable)
- in reporting stats locally.
- - Fix an assert trigger: sometimes launching circuits can fail
- immediately, e.g. because too many circuits have failed recently.
- - Fix a compile warning on 64 bit platforms.
- Changes in version 0.0.9pre2 - 2004-10-03
- o Bugfixes:
- - Make fetching a cached directory work for 64-bit platforms too.
- - Make zlib.h a required header, not an optional header.
- Changes in version 0.0.9pre1 - 2004-10-01
- o Bugfixes:
- - Stop using separate defaults for no-config-file and
- empty-config-file. Now you have to explicitly turn off SocksPort,
- if you don't want it open.
- - Fix a bug in OutboundBindAddress so it (hopefully) works.
- - Improve man page to mention more of the 0.0.8 features.
- - Fix a rare seg fault for people running hidden services on
- intermittent connections.
- - Change our file IO stuff (especially wrt OpenSSL) so win32 is
- happier.
- - Fix more dns related bugs: send back resolve_failed and end cells
- more reliably when the resolve fails, rather than closing the
- circuit and then trying to send the cell. Also attach dummy resolve
- connections to a circuit *before* calling dns_resolve(), to fix
- a bug where cached answers would never be sent in RESOLVED cells.
- - When we run out of disk space, or other log writing error, don't
- crash. Just stop logging to that log and continue.
- - We were starting to daemonize before we opened our logs, so if
- there were any problems opening logs, we would complain to stderr,
- which wouldn't work, and then mysteriously exit.
- - Fix a rare bug where sometimes a verified OR would connect to us
- before he'd uploaded his descriptor, which would cause us to
- assign conn->nickname as though he's unverified. Now we look through
- the fingerprint list to see if he's there.
- - Fix a rare assert trigger, where routerinfos for entries in
- our cpath would expire while we're building the path.
- o Features:
- - Clients can ask dirservers for /dir.z to get a compressed version
- of the directory. Only works for servers running 0.0.9, of course.
- - Make clients cache directories and use them to seed their router
- lists at startup. This means clients have a datadir again.
- - Configuration infrastructure support for warning on obsolete
- options.
- - Respond to content-encoding headers by trying to uncompress as
- appropriate.
- - Reply with a deflated directory when a client asks for "dir.z".
- We could use allow-encodings instead, but allow-encodings isn't
- specified in HTTP 1.0.
- - Raise the max dns workers from 50 to 100.
- - Discourage people from setting their dirfetchpostperiod more often
- than once per minute.
- - Protect dirservers from overzealous descriptor uploading -- wait
- 10 seconds after directory gets dirty, before regenerating.
- Changes in version 0.0.8 - 2004-08-25
- o Port it to SunOS 5.9 / Athena
- Changes in version 0.0.8rc2 - 2004-08-20
- o Make it compile on cygwin again.
- o When picking unverified routers, skip those with low uptime and/or
- low bandwidth, depending on what properties you care about.
- Changes in version 0.0.8rc1 - 2004-08-18
- o Changes from 0.0.7.3:
- - Bugfixes:
- - Fix assert triggers: if the other side returns an address 0.0.0.0,
- don't put it into the client dns cache.
- - If a begin failed due to exit policy, but we believe the IP address
- should have been allowed, switch that router to exitpolicy reject *:*
- until we get our next directory.
- - Features:
- - Clients choose nodes proportional to advertised bandwidth.
- - Avoid using nodes with low uptime as introduction points.
- - Handle servers with dynamic IP addresses: don't replace
- options->Address with the resolved one at startup, and
- detect our address right before we make a routerinfo each time.
- - 'FascistFirewall' option to pick dirservers and ORs on specific
- ports; plus 'FirewallPorts' config option to tell FascistFirewall
- which ports are open. (Defaults to 80,443)
- - Be more aggressive about trying to make circuits when the network
- has changed (e.g. when you unsuspend your laptop).
- - Check for time skew on http headers; report date in response to
- "GET /".
- - If the entrynode config line has only one node, don't pick it as
- an exitnode.
- - Add strict{entry|exit}nodes config options. If set to 1, then
- we refuse to build circuits that don't include the specified entry
- or exit nodes.
- - OutboundBindAddress config option, to bind to a specific
- IP address for outgoing connect()s.
- - End truncated log entries (e.g. directories) with "[truncated]".
- o Patches to 0.0.8preX:
- - Bugfixes:
- - Patches to compile and run on win32 again (maybe)?
- - Fix crash when looking for ~/.torrc with no $HOME set.
- - Fix a race bug in the unit tests.
- - Handle verified/unverified name collisions better when new
- routerinfo's arrive in a directory.
- - Sometimes routers were getting entered into the stats before
- we'd assigned their identity_digest. Oops.
- - Only pick and establish intro points after we've gotten a
- directory.
- - Features:
- - AllowUnverifiedNodes config option to let circuits choose no-name
- routers in entry,middle,exit,introduction,rendezvous positions.
- Allow middle and rendezvous positions by default.
- - Add a man page for tor-resolve.
- Changes in version 0.0.7.3 - 2004-08-12
- o Stop dnsworkers from triggering an assert failure when you
- ask them to resolve the host "".
- Changes in version 0.0.8pre3 - 2004-08-09
- o Changes from 0.0.7.2:
- - Allow multiple ORs with same nickname in routerlist -- now when
- people give us one identity key for a nickname, then later
- another, we don't constantly complain until the first expires.
- - Remember used bandwidth (both in and out), and publish 15-minute
- snapshots for the past day into our descriptor.
- - You can now fetch $DIRURL/running-routers to get just the
- running-routers line, not the whole descriptor list. (But
- clients don't use this yet.)
- - When people mistakenly use Tor as an http proxy, point them
- at the tor-doc.html rather than the INSTALL.
- - Remove our mostly unused -- and broken -- hex_encode()
- function. Use base16_encode() instead. (Thanks to Timo Lindfors
- for pointing out this bug.)
- - Rotate onion keys every 12 hours, not every 2 hours, so we have
- fewer problems with people using the wrong key.
- - Change the default exit policy to reject the default edonkey,
- kazaa, gnutella ports.
- - Add replace_file() to util.[ch] to handle win32's rename().
- o Changes from 0.0.8preX:
- - Fix two bugs in saving onion keys to disk when rotating, so
- hopefully we'll get fewer people using old onion keys.
- - Fix an assert error that was making SocksPolicy not work.
- - Be willing to expire routers that have an open dirport -- it's
- just the authoritative dirservers we want to not forget.
- - Reject tor-resolve requests for .onion addresses early, so we
- don't build a whole rendezvous circuit and then fail.
- - When you're warning a server that he's unverified, don't cry
- wolf unpredictably.
- - Fix a race condition: don't try to extend onto a connection
- that's still handshaking.
- - For servers in clique mode, require the conn to be open before
- you'll choose it for your path.
- - Fix some cosmetic bugs about duplicate mark-for-close, lack of
- end relay cell, etc.
- - Measure bandwidth capacity over the last 24 hours, not just 12
- - Bugfix: authoritative dirservers were making and signing a new
- directory for each client, rather than reusing the cached one.
- Changes in version 0.0.8pre2 - 2004-08-04
- o Changes from 0.0.7.2:
- - Security fixes:
- - Check directory signature _before_ you decide whether you're
- you're running an obsolete version and should exit.
- - Check directory signature _before_ you parse the running-routers
- list to decide who's running or verified.
- - Bugfixes and features:
- - Check return value of fclose while writing to disk, so we don't
- end up with broken files when servers run out of disk space.
- - Log a warning if the user uses an unsafe socks variant, so people
- are more likely to learn about privoxy or socat.
- - Dirservers now include RFC1123-style dates in the HTTP headers,
- which one day we will use to better detect clock skew.
- o Changes from 0.0.8pre1:
- - Make it compile without warnings again on win32.
- - Log a warning if you're running an unverified server, to let you
- know you might want to get it verified.
- - Only pick a default nickname if you plan to be a server.
- Changes in version 0.0.8pre1 - 2004-07-23
- o Bugfixes:
- - Made our unit tests compile again on OpenBSD 3.5, and tor
- itself compile again on OpenBSD on a sparc64.
- - We were neglecting milliseconds when logging on win32, so
- everything appeared to happen at the beginning of each second.
- o Protocol changes:
- - 'Extend' relay cell payloads now include the digest of the
- intended next hop's identity key. Now we can verify that we're
- extending to the right router, and also extend to routers we
- hadn't heard of before.
- o Features:
- - Tor nodes can now act as relays (with an advertised ORPort)
- without being manually verified by the dirserver operators.
- - Uploaded descriptors of unverified routers are now accepted
- by the dirservers, and included in the directory.
- - Verified routers are listed by nickname in the running-routers
- list; unverified routers are listed as "$<fingerprint>".
- - We now use hash-of-identity-key in most places rather than
- nickname or addr:port, for improved security/flexibility.
- - To avoid Sybil attacks, paths still use only verified servers.
- But now we have a chance to play around with hybrid approaches.
- - Nodes track bandwidth usage to estimate capacity (not used yet).
- - ClientOnly option for nodes that never want to become servers.
- - Directory caching.
- - "AuthoritativeDir 1" option for the official dirservers.
- - Now other nodes (clients and servers) will cache the latest
- directory they've pulled down.
- - They can enable their DirPort to serve it to others.
- - Clients will pull down a directory from any node with an open
- DirPort, and check the signature/timestamp correctly.
- - Authoritative dirservers now fetch directories from other
- authdirservers, to stay better synced.
- - Running-routers list tells who's down also, along with noting
- if they're verified (listed by nickname) or unverified (listed
- by hash-of-key).
- - Allow dirservers to serve running-router list separately.
- This isn't used yet.
- - ORs connect-on-demand to other ORs
- - If you get an extend cell to an OR you're not connected to,
- connect, handshake, and forward the create cell.
- - The authoritative dirservers stay connected to everybody,
- and everybody stays connected to 0.0.7 servers, but otherwise
- clients/servers expire unused connections after 5 minutes.
- - When servers get a sigint, they delay 30 seconds (refusing new
- connections) then exit. A second sigint causes immediate exit.
- - File and name management:
- - Look for .torrc if no CONFDIR "torrc" is found.
- - If no datadir is defined, then choose, make, and secure ~/.tor
- as datadir.
- - If torrc not found, exitpolicy reject *:*.
- - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
- - If no nickname is defined, derive default from hostname.
- - Rename secret key files, e.g. identity.key -> secret_id_key,
- to discourage people from mailing their identity key to tor-ops.
- - Refuse to build a circuit before the directory has arrived --
- it won't work anyway, since you won't know the right onion keys
- to use.
- - Try other dirservers immediately if the one you try is down. This
- should tolerate down dirservers better now.
- - Parse tor version numbers so we can do an is-newer-than check
- rather than an is-in-the-list check.
- - New socks command 'resolve', to let us shim gethostbyname()
- locally.
- - A 'tor_resolve' script to access the socks resolve functionality.
- - A new socks-extensions.txt doc file to describe our
- interpretation and extensions to the socks protocols.
- - Add a ContactInfo option, which gets published in descriptor.
- - Publish OR uptime in descriptor (and thus in directory) too.
- - Write tor version at the top of each log file
- - New docs in the tarball:
- - tor-doc.html.
- - Document that you should proxy your SSL traffic too.
- Changes in version 0.0.7.2 - 2004-07-07
- o A better fix for the 0.0.0.0 problem, that will hopefully
- eliminate the remaining related assertion failures.
- Changes in version 0.0.7.1 - 2004-07-04
- o When an address resolves to 0.0.0.0, treat it as a failed resolve,
- since internally we use 0.0.0.0 to signify "not yet resolved".
- Changes in version 0.0.7 - 2004-06-07
- o Updated the man page to reflect the new features.
- Changes in version 0.0.7rc2 - 2004-06-06
- o Changes from 0.0.7rc1:
- - Make it build on Win32 again.
- o Changes from 0.0.6.2:
- - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
- settings too.
- Changes in version 0.0.7rc1 - 2004-06-02
- o Bugfixes:
- - On sighup, we were adding another log without removing the first
- one. So log messages would get duplicated n times for n sighups.
- - Several cases of using a connection after we'd freed it. The
- problem was that connections that are pending resolve are in both
- the pending_resolve tree, and also the circuit's resolving_streams
- list. When you want to remove one, you must remove it from both.
- - Fix a double-mark-for-close where an end cell arrived for a
- resolving stream, and then the resolve failed.
- - Check directory signatures based on name of signer, not on whom
- we got the directory from. This will let us cache directories more
- easily.
- o Features:
- - Crank up some of our constants to handle more users.
- Changes in version 0.0.7pre1 - 2004-06-02
- o Fixes for crashes and other obnoxious bugs:
- - Fix an epipe bug: sometimes when directory connections failed
- to connect, we would give them a chance to flush before closing
- them.
- - When we detached from a circuit because of resolvefailed, we
- would immediately try the same circuit twice more, and then
- give up on the resolve thinking we'd tried three different
- exit nodes.
- - Limit the number of intro circuits we'll attempt to build for a
- hidden service per 15-minute period.
- - Check recommended-software string *early*, before actually parsing
- the directory. Thus we can detect an obsolete version and exit,
- even if the new directory format doesn't parse.
- o Fixes for security bugs:
- - Remember which nodes are dirservers when you startup, and if a
- random OR enables his dirport, don't automatically assume he's
- a trusted dirserver.
- o Other bugfixes:
- - Directory connections were asking the wrong poll socket to
- start writing, and not asking themselves to start writing.
- - When we detached from a circuit because we sent a begin but
- didn't get a connected, we would use it again the first time;
- but after that we would correctly switch to a different one.
- - Stop warning when the first onion decrypt attempt fails; they
- will sometimes legitimately fail now that we rotate keys.
- - Override unaligned-access-ok check when $host_cpu is ia64 or
- arm. Apparently they allow it but the kernel whines.
- - Dirservers try to reconnect periodically too, in case connections
- have failed.
- - Fix some memory leaks in directory servers.
- - Allow backslash in Win32 filenames.
- - Made Tor build complain-free on FreeBSD, hopefully without
- breaking other BSD builds. We'll see.
- o Features:
- - Doxygen markup on all functions and global variables.
- - Make directory functions update routerlist, not replace it. So
- now directory disagreements are not so critical a problem.
- - Remove the upper limit on number of descriptors in a dirserver's
- directory (not that we were anywhere close).
- - Allow multiple logfiles at different severity ranges.
- - Allow *BindAddress to specify ":port" rather than setting *Port
- separately. Allow multiple instances of each BindAddress config
- option, so you can bind to multiple interfaces if you want.
- - Allow multiple exit policy lines, which are processed in order.
- Now we don't need that huge line with all the commas in it.
- - Enable accept/reject policies on SOCKS connections, so you can bind
- to 0.0.0.0 but still control who can use your OP.
- Changes in version 0.0.6.2 - 2004-05-16
- o Our integrity-checking digest was checking only the most recent cell,
- not the previous cells like we'd thought.
- Thanks to Stefan Mark for finding the flaw!
- Changes in version 0.0.6.1 - 2004-05-06
- o Fix two bugs in our AES counter-mode implementation (this affected
- onion-level stream encryption, but not TLS-level). It turns
- out we were doing something much more akin to a 16-character
- polyalphabetic cipher. Oops.
- Thanks to Stefan Mark for finding the flaw!
- o Retire moria3 as a directory server, and add tor26 as a directory
- server.
- Changes in version 0.0.6 - 2004-05-02
- [version bump only]
- Changes in version 0.0.6rc4 - 2004-05-01
- o Update the built-in dirservers list to use the new directory format
- o Fix a rare seg fault: if a node offering a hidden service attempts
- to build a circuit to Alice's rendezvous point and fails before it
- reaches the last hop, it retries with a different circuit, but
- then dies.
- o Handle windows socket errors correctly.
- Changes in version 0.0.6rc3 - 2004-04-28
- o Don't expire non-general excess circuits (if we had enough
- circuits open, we were expiring rendezvous circuits -- even
- when they had a stream attached. oops.)
- o Fetch randomness from /dev/urandom better (not via fopen/fread)
- o Better debugging for tls errors
- o Some versions of openssl have an SSL_pending function that erroneously
- returns bytes when there is a non-application record pending.
- o Set Content-Type on the directory and hidserv descriptor.
- o Remove IVs from cipher code, since AES-ctr has none.
- o Win32 fixes. Tor now compiles on win32 with no warnings/errors.
- o We were using an array of length zero in a few places.
- o win32's gethostbyname can't resolve an IP to an IP.
- o win32's close can't close a socket.
- Changes in version 0.0.6rc2 - 2004-04-26
- o Fix a bug where we were closing tls connections intermittently.
- It turns out openssl keeps its errors around -- so if an error
- happens, and you don't ask about it, and then another openssl
- operation happens and succeeds, and you ask if there was an error,
- it tells you about the first error. Fun fun.
- o Fix a bug that's been lurking since 27 may 03 (!)
- When passing back a destroy cell, we would use the wrong circ id.
- 'Mostly harmless', but still worth fixing.
- o Since we don't support truncateds much, don't bother sending them;
- just close the circ.
- o check for <machine/limits.h> so we build on NetBSD again (I hope).
- o don't crash if a conn that sent a begin has suddenly lost its circuit
- (this was quite rare).
- Changes in version 0.0.6rc1 - 2004-04-25
- o We now rotate link (tls context) keys and onion keys.
- o CREATE cells now include oaep padding, so you can tell
- if you decrypted them correctly.
- o Add bandwidthburst to server descriptor.
- o Directories now say which dirserver signed them.
- o Use a tor_assert macro that logs failed assertions too.
- Changes in version 0.0.6pre5 - 2004-04-18
- o changes from 0.0.6pre4:
- - make tor build on broken freebsd 5.2 installs
- - fix a failed assert when you try an intro point, get a nack, and try
- a second one and it works.
- - when alice uses a port that the hidden service doesn't accept,
- it now sends back an end cell (denied by exit policy). otherwise
- alice would just have to wait to time out.
- - fix another rare bug: when we had tried all the intro
- points for a hidden service, we fetched the descriptor
- again, but we left our introcirc thinking it had already
- sent an intro, so it kept waiting for a response...
- - bugfix: when you sleep your hidden-service laptop, as soon
- as it wakes up it tries to upload a service descriptor, but
- socketpair fails for some reason (localhost not up yet?).
- now we simply give up on that upload, and we'll try again later.
- i'd still like to find the bug though.
- - if an intro circ waiting for an ack dies before getting one, then
- count it as a nack
- - we were reusing stale service descriptors and refetching usable
- ones. oops.
- Changes in version 0.0.6pre4 - 2004-04-14
- o changes from 0.0.6pre3:
- - when bob fails to connect to the rendezvous point, and his
- circ didn't fail because of the rendezvous point itself, then
- he retries a couple of times
- - we expire introduction and rendezvous circs more thoroughly
- (sometimes they were hanging around forever)
- - we expire unattached rendezvous streams that have been around
- too long (they were sticking around forever).
- - fix a measly fencepost error that was crashing everybody with
- a strict glibc.
- Changes in version 0.0.6pre3 - 2004-04-14
- o changes from 0.0.6pre2:
- - make hup work again
- - fix some memory leaks for dirservers
- - allow more skew in rendezvous descriptor timestamps, to help
- handle people like blanu who don't know what time it is
- - normal circs are 3 hops, but some rend/intro circs are 4, if
- the initiator doesn't get to choose the last hop
- - send acks for introductions, so alice can know whether to try
- again
- - bob publishes intro points more correctly
- o changes from 0.0.5:
- - fix an assert trigger that's been plaguing us since the days
- of 0.0.2prexx (thanks weasel!)
- - retry stream correctly when we fail to connect because of
- exit-policy-reject (should try another) or can't-resolve-address
- (also should try another, because dns on random internet servers
- is flaky).
- - when we hup a dirserver and we've *removed* a server from the
- approved-routers list, now we remove that server from the
- in-memory directories too
- Changes in version 0.0.6pre2 - 2004-04-08
- o We fixed our base32 implementation. Now it works on all architectures.
- Changes in version 0.0.6pre1 - 2004-04-08
- o Features:
- - Hidden services and rendezvous points are implemented. Go to
- http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
- hidden services. (This only works via a socks4a proxy such as
- Privoxy, and currently it's quite slow.)
- Changes in version 0.0.5 - 2004-03-30
- [version bump only]
- Changes in version 0.0.5rc3 - 2004-03-29
- o Install torrc as torrc.sample -- we no longer clobber your
- torrc. (Woo!)
- o Re-enable recommendedversion checking (we broke it in rc2, oops)
- o Add in a 'notice' log level for things the operator should hear
- but that aren't warnings
- Changes in version 0.0.5rc2 - 2004-03-29
- o Hold socks connection open until reply is flushed (if possible)
- o Make exit nodes resolve IPs to IPs immediately, rather than asking
- the dns farm to do it.
- o Fix c99 aliasing warnings in rephist.c
- o Don't include server descriptors that are older than 24 hours in the
- directory.
- o Give socks 'reject' replies their whole 15s to attempt to flush,
- rather than seeing the 60s timeout and assuming the flush had failed.
- o Clean automake droppings from the cvs repository
- Changes in version 0.0.5rc1 - 2004-03-28
- o Fix mangled-state bug in directory fetching (was causing sigpipes).
- o Only build circuits after we've fetched the directory: clients were
- using only the directory servers before they'd fetched a directory.
- This also means longer startup time; so it goes.
- o Fix an assert trigger where an OP would fail to handshake, and we'd
- expect it to have a nickname.
- o Work around a tsocks bug: do a socks reject when AP connection dies
- early, else tsocks goes into an infinite loop.
- Changes in version 0.0.4 - 2004-03-26
- o When connecting to a dirserver or OR and the network is down,
- we would crash.
- Changes in version 0.0.3 - 2004-03-26
- o Warn and fail if server chose a nickname with illegal characters
- o Port to Solaris and Sparc:
- - include missing header fcntl.h
- - have autoconf find -lsocket -lnsl automatically
- - deal with hardware word alignment
- - make uname() work (solaris has a different return convention)
- - switch from using signal() to sigaction()
- o Preliminary work on reputation system:
- - Keep statistics on success/fail of connect attempts; they're published
- by kill -USR1 currently.
- - Add a RunTesting option to try to learn link state by creating test
- circuits, even when SocksPort is off.
- - Remove unused open circuits when there are too many.
- Changes in version 0.0.2 - 2004-03-19
- - Include strlcpy and strlcat for safer string ops
- - define INADDR_NONE so we compile (but still not run) on solaris
- Changes in version 0.0.2pre27 - 2004-03-14
- o Bugfixes:
- - Allow internal tor networks (we were rejecting internal IPs,
- now we allow them if they're set explicitly).
- - And fix a few endian issues.
- Changes in version 0.0.2pre26 - 2004-03-14
- o New features:
- - If a stream times out after 15s without a connected cell, don't
- try that circuit again: try a new one.
- - Retry streams at most 4 times. Then give up.
- - When a dirserver gets a descriptor from an unknown router, it
- logs its fingerprint (so the dirserver operator can choose to
- accept it even without mail from the server operator).
- - Inform unapproved servers when we reject their descriptors.
- - Make tor build on Windows again. It works as a client, who knows
- about as a server.
- - Clearer instructions in the torrc for how to set up a server.
- - Be more efficient about reading fd's when our global token bucket
- (used for rate limiting) becomes empty.
- o Bugfixes:
- - Stop asserting that computers always go forward in time. It's
- simply not true.
- - When we sent a cell (e.g. destroy) and then marked an OR connection
- expired, we might close it before finishing a flush if the other
- side isn't reading right then.
- - Don't allow dirservers to start if they haven't defined
- RecommendedVersions
- - We were caching transient dns failures. Oops.
- - Prevent servers from publishing an internal IP as their address.
- - Address a strcat vulnerability in circuit.c
- Changes in version 0.0.2pre25 - 2004-03-04
- o New features:
- - Put the OR's IP in its router descriptor, not its fqdn. That way
- we'll stop being stalled by gethostbyname for nodes with flaky dns,
- e.g. poblano.
- o Bugfixes:
- - If the user typed in an address that didn't resolve, the server
- crashed.
- Changes in version 0.0.2pre24 - 2004-03-03
- o Bugfixes:
- - Fix an assertion failure in dns.c, where we were trying to dequeue
- a pending dns resolve even if it wasn't pending
- - Fix a spurious socks5 warning about still trying to write after the
- connection is finished.
- - Hold certain marked_for_close connections open until they're finished
- flushing, rather than losing bytes by closing them too early.
- - Correctly report the reason for ending a stream
- - Remove some duplicate calls to connection_mark_for_close
- - Put switch_id and start_daemon earlier in the boot sequence, so it
- will actually try to chdir() to options.DataDirectory
- - Make 'make test' exit(1) if a test fails; fix some unit tests
- - Make tor fail when you use a config option it doesn't know about,
- rather than warn and continue.
- - Make --version work
- - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
- Changes in version 0.0.2pre23 - 2004-02-29
- o New features:
- - Print a statement when the first circ is finished, so the user
- knows it's working.
- - If a relay cell is unrecognized at the end of the circuit,
- send back a destroy. (So attacks to mutate cells are more
- clearly thwarted.)
- - New config option 'excludenodes' to avoid certain nodes for circuits.
- - When it daemonizes, it chdir's to the DataDirectory rather than "/",
- so you can collect coredumps there.
- o Bugfixes:
- - Fix a bug in tls flushing where sometimes data got wedged and
- didn't flush until more data got sent. Hopefully this bug was
- a big factor in the random delays we were seeing.
- - Make 'connected' cells include the resolved IP, so the client
- dns cache actually gets populated.
- - Disallow changing from ORPort=0 to ORPort>0 on hup.
- - When we time-out on a stream and detach from the circuit, send an
- end cell down it first.
- - Only warn about an unknown router (in exitnodes, entrynodes,
- excludenodes) after we've fetched a directory.
- Changes in version 0.0.2pre22 - 2004-02-26
- o New features:
- - Servers publish less revealing uname information in descriptors.
- - More memory tracking and assertions, to crash more usefully when
- errors happen.
- - If the default torrc isn't there, just use some default defaults.
- Plus provide an internal dirservers file if they don't have one.
- - When the user tries to use Tor as an http proxy, give them an http
- 501 failure explaining that we're a socks proxy.
- - Dump a new router.desc on hup, to help confused people who change
- their exit policies and then wonder why router.desc doesn't reflect
- it.
- - Clean up the generic tor.sh init script that we ship with.
- o Bugfixes:
- - If the exit stream is pending on the resolve, and a destroy arrives,
- then the stream wasn't getting removed from the pending list. I
- think this was the one causing recent server crashes.
- - Use a more robust poll on OSX 10.3, since their poll is flaky.
- - When it couldn't resolve any dirservers, it was useless from then on.
- Now it reloads the RouterFile (or default dirservers) if it has no
- dirservers.
- - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
- many users don't even *have* a /usr/local/sbin/.
- Changes in version 0.0.2pre21 - 2004-02-18
- o New features:
- - There's a ChangeLog file that actually reflects the changelog.
- - There's a 'torify' wrapper script, with an accompanying
- tor-tsocks.conf, that simplifies the process of using tsocks for
- tor. It even has a man page.
- - The tor binary gets installed to sbin rather than bin now.
- - Retry streams where the connected cell hasn't arrived in 15 seconds
- - Clean up exit policy handling -- get the default out of the torrc,
- so we can update it without forcing each server operator to fix
- his/her torrc.
- - Allow imaps and pop3s in default exit policy
- o Bugfixes:
- - Prevent picking middleman nodes as the last node in the circuit
- Changes in version 0.0.2pre20 - 2004-01-30
- o New features:
- - We now have a deb package, and it's in debian unstable. Go to
- it, apt-getters. :)
- - I've split the TotalBandwidth option into BandwidthRate (how many
- bytes per second you want to allow, long-term) and
- BandwidthBurst (how many bytes you will allow at once before the cap
- kicks in). This better token bucket approach lets you, say, set
- BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
- performance while not exceeding your monthly bandwidth quota.
- - Push out a tls record's worth of data once you've got it, rather
- than waiting until you've read everything waiting to be read. This
- may improve performance by pipelining better. We'll see.
- - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
- from failed circuits (if they haven't been connected yet) and attach
- to new ones.
- - Expire old streams that haven't managed to connect. Some day we'll
- have them reattach to new circuits instead.
- o Bugfixes:
- - Fix several memory leaks that were causing servers to become bloated
- after a while.
- - Fix a few very rare assert triggers. A few more remain.
- - Setuid to User _before_ complaining about running as root.
- Changes in version 0.0.2pre19 - 2004-01-07
- o Bugfixes:
- - Fix deadlock condition in dns farm. We were telling a child to die by
- closing the parent's file descriptor to him. But newer children were
- inheriting the open file descriptor from the parent, and since they
- weren't closing it, the socket never closed, so the child never read
- eof, so he never knew to exit. Similarly, dns workers were holding
- open other sockets, leading to all sorts of chaos.
- - New cleaner daemon() code for forking and backgrounding.
- - If you log to a file, it now prints an entry at the top of the
- logfile so you know it's working.
- - The onionskin challenge length was 30 bytes longer than necessary.
- - Started to patch up the spec so it's not quite so out of date.
- Changes in version 0.0.2pre18 - 2004-01-02
- o Bugfixes:
- - Fix endian issues with the 'integrity' field in the relay header.
- - Fix a potential bug where connections in state
- AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
- Changes in version 0.0.2pre17 - 2003-12-30
- o Bugfixes:
- - Made --debuglogfile (or any second log file, actually) work.
- - Resolved an edge case in get_unique_circ_id_by_conn where a smart
- adversary could force us into an infinite loop.
- o Features:
- - Each onionskin handshake now includes a hash of the computed key,
- to prove the server's identity and help perfect forward secrecy.
- - Changed cell size from 256 to 512 bytes (working toward compatibility
- with MorphMix).
- - Changed cell length to 2 bytes, and moved it to the relay header.
- - Implemented end-to-end integrity checking for the payloads of
- relay cells.
- - Separated streamid from 'recognized' (otherwise circuits will get
- messed up when we try to have streams exit from the middle). We
- use the integrity-checking to confirm that a cell is addressed to
- this hop.
- - Randomize the initial circid and streamid values, so an adversary who
- breaks into a node can't learn how many circuits or streams have
- been made so far.
- Changes in version 0.0.2pre16 - 2003-12-14
- o Bugfixes:
- - Fixed a bug that made HUP trigger an assert
- - Fixed a bug where a circuit that immediately failed wasn't being
- counted as a failed circuit in counting retries.
- o Features:
- - Now we close the circuit when we get a truncated cell: otherwise we're
- open to an anonymity attack where a bad node in the path truncates
- the circuit and then we open streams at him.
- - Add port ranges to exit policies
- - Add a conservative default exit policy
- - Warn if you're running tor as root
- - on HUP, retry OR connections and close/rebind listeners
- - options.EntryNodes: try these nodes first when picking the first node
- - options.ExitNodes: if your best choices happen to include any of
- your preferred exit nodes, you choose among just those preferred
- exit nodes.
- - options.ExcludedNodes: nodes that are never picked in path building
- Changes in version 0.0.2pre15 - 2003-12-03
- o Robustness and bugfixes:
- - Sometimes clients would cache incorrect DNS resolves, which would
- really screw things up.
- - An OP that goes offline would slowly leak all its sockets and stop
- working.
- - A wide variety of bugfixes in exit node selection, exit policy
- handling, and processing pending streams when a new circuit is
- established.
- - Pick nodes for a path only from those the directory says are up
- - Choose randomly from all running dirservers, not always the first one
- - Increase allowed http header size for directory fetch.
- - Stop writing to stderr (if we're daemonized it will be closed).
- - Enable -g always, so cores will be more useful to me.
- - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
- o Documentation:
- - Wrote a man page. It lists commonly used options.
- o Configuration:
- - Change default loglevel to warn.
- - Make PidFile default to null rather than littering in your CWD.
- - OnionRouter config option is now obsolete. Instead it just checks
- ORPort>0.
- - Moved to a single unified torrc file for both clients and servers.
- Changes in version 0.0.2pre14 - 2003-11-29
- o Robustness and bugfixes:
- - Force the admin to make the DataDirectory himself
- - to get ownership/permissions right
- - so clients no longer make a DataDirectory and then never use it
- - fix bug where a client who was offline for 45 minutes would never
- pull down a directory again
- - fix (or at least hide really well) the dns assert bug that was
- causing server crashes
- - warnings and improved robustness wrt clockskew for certs
- - use the native daemon(3) to daemonize, when available
- - exit if bind() fails
- - exit if neither socksport nor orport is defined
- - include our own tor_timegm (Win32 doesn't have its own)
- - bugfix for win32 with lots of connections
- - fix minor bias in PRNG
- - make dirserver more robust to corrupt cached directory
- o Documentation:
- - Wrote the design document (woo)
- o Circuit building and exit policies:
- - Circuits no longer try to use nodes that the directory has told them
- are down.
- - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
- bitcounts (18.0.0.0/8).
- - Make AP connections standby for a circuit if no suitable circuit
- exists, rather than failing
- - Circuits choose exit node based on addr/port, exit policies, and
- which AP connections are standing by
- - Bump min pathlen from 2 to 3
- - Relay end cells have a payload to describe why the stream ended.
- - If the stream failed because of exit policy, try again with a new
- circuit.
- - Clients have a dns cache to remember resolved addresses.
- - Notice more quickly when we have no working circuits
- o Configuration:
- - APPort is now called SocksPort
- - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
- where to bind
- - RecommendedVersions is now a config variable rather than
- hardcoded (for dirservers)
- - Reloads config on HUP
- - Usage info on -h or --help
- - If you set User and Group config vars, it'll setu/gid to them.
- Changes in version 0.0.2pre13 - 2003-10-19
- o General stability:
- - SSL_write no longer fails when it returns WANTWRITE and the number
- of bytes in the buf has changed by the next SSL_write call.
- - Fix segfault fetching directory when network is down
- - Fix a variety of minor memory leaks
- - Dirservers reload the fingerprints file on HUP, so I don't have
- to take down the network when I approve a new router
- - Default server config file has explicit Address line to specify fqdn
- o Buffers:
- - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
- - Make listener connections not ever alloc bufs
- o Autoconf improvements:
- - don't clobber an external CFLAGS in ./configure
- - Make install now works
- - create var/lib/tor on make install
- - autocreate a tor.sh initscript to help distribs
- - autocreate the torrc and sample-server-torrc with correct paths
- o Log files and Daemonizing now work:
- - If --DebugLogFile is specified, log to it at -l debug
- - If --LogFile is specified, use it instead of commandline
- - If --RunAsDaemon is set, tor forks and backgrounds on startup
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