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- Changes in version 0.2.9.1-alpha - 2016-??-??
- 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 tor-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; update fallback directories based on the latest
- OnionOO data; and any other minor simplifications and fixes.
- Closes tasks 17158, 17905, 18749, bug 18689, and fixes part of bug
- 18812 on 0.2.8.1-alpha; 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 18625; 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 default fallback directories, 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 relay 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 relay 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 occured 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 targetted 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 documenation 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 pa
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