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+Changes in version 0.2.7.3-????? - 2015-09-1?
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+ XXXX write a blurb
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+
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+ o Major features (security, hidden services):
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+ - For an hidden service, it is now prohibited to use one single
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+ EntryNodes to avoid a very easy guard discovery attack. For more
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+ details, see the ticket description here:
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+ https://trac.torproject.org/projects/tor/ticket/14917. Fixes
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+ ticket 14917.
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+
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+ o Major features (relay, Ed25519):
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+ - Significant improvements to the usability of relay-side Ed25519
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+ key management. Log messages are better, and the code can recover
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+ from far more failure conditions. Thanks to "s7r" for reporting
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+ and diagnosing so many of these!
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+
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+ o Major bugfixes (relay, Ed25519):
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+ - Avoid crashing on 'tor --keygen'. Fixes bug 16679; bugfix on
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+ 0.2.7.2-alpha. Reported by "s7r".
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+ - Improve handling of expired signing keys along with offline master
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+ keys. Fixes bug 16685; bugfix on 0.2.7.2-alpha. Reported by "s7r".
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+
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+ o Major enhancements (performance testing):
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+ - Add chutney performance testing support to src/test/test-
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+ network.sh The following arguments change how chutney verifies the
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+ network: "--bytes n" sends n bytes per test connection;
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+ "--connections n" makes n test connections per client; and
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+ "--hs-multi-client 1" makes each client connect to each HS.
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+ Requires the corresponding chutney performance testing changes.
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+ Note: using --connections 7 or greater on a HS will trigger issue
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+ 15937. Patch by "teor". Closes ticket 14175.
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+
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+ o Minor features:
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+ - Try harder to normalize the exit status of the Tor process to the
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+ standard-provided range. Fixes bug 16975; bugfix on every version
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+ of Tor ever.
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+ - Update geoip and geoip6 to the July 8 2015 Maxmind GeoLite2
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+ Country database.
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+
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+ o Minor features (client-side privacy):
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+ - Indefinitely extend circuit lifespan by resetting dirtyness, if
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+ IsolateSOCKSAuth is in use, the new `KeepAliveIsolateSOCKSAuth`
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+ option is set, and streams with SOCKS authentication are attached
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+ to the circuit. Implements feature 15482.
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+
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+ o Minor features (compilation):
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+ - Give a warning as early as possible when trying to build with an
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+ unsupported OpenSSL version. Closes ticket 16901.
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+
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+ o Minor features (Hidden service directory):
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+ - Relays need to have the Fast flag to get the HSDir flag. As this
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+ is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
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+ drop. Fixes ticket 15963.
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+
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+ o Minor features (hidden Service Statistics):
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+ - Turn on hidden service statistics collection by setting the torrc
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+ option HiddenServiceStatistics to "1" by default. Closes
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+ ticket 15254.
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+
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+ o Minor features (hidden service):
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+ - Client now uses an introduction point failure cache to know when
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+ to fetch or keep a descriptor in their cache.
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+
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+ When fetching a descriptor, for every introduction points in it,
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+ we look them up in the failure cache to know if we keep the
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+ descriptor or not. For this to work, everytime an introduction
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+ points is discarded (ex: receiving a NACK), we note it down in our
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+ introduction cache. If all introduction points for an onion
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+ service are in our failure cache, we discard the descriptor and
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+ fetch a new one.
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+
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+ See rendcache.c for a detailed explanation of the cache's
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+ behavior. Closes ticket 16389.
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+
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+ o Minor features (performance):
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+ - Improve the runtime speed of Ed25519 operations and Curve25519
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+ keypair generation when built targeting 32 bit x86 platforms with
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+ SSE2 available. Implements ticket 16535.
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+ - Improve the runtime speed of Ed25519 signature verification by
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+ using Ed25519-donna's batch verification support when there are a
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+ lot of signatures to verify at once. Implements ticket 16533.
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+
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+ o Minor features (testing):
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+ - Autodetect CHUTNEY_PATH if the chutney and tor sources are side-
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+ by-side in the same parent directory. Closes ticket 16903. Patch
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+ by "teor".
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+
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+ o Minor features (testing, authorities):
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+ - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags. "A node
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+ will never receive the corresponding flag unless that node is
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+ specified in the TestingDirAuthVote{Exit,Guard,HSDir} list,
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+ regardless of its uptime, bandwidth, exit policy, or DirPort".
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+ Closes ticket 14882. Patch by "robgjansen", modified by "teor" as
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+ VoteOnHidServDirectoriesV2 is now obsolete. Commit message and
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+ changes file by "teor" & "robgjansen".
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+
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+ o Minor features (testing, authorities, documentation):
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+ - Fix an error in the manual page and comments for
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+ TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
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+ required "ORPort connectivity". While this is true, it is in no
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+ way unique to the HSDir flag. Of all the flags, only HSDirs need a
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+ DirPort configured in order for the authorities to assign that
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+ particular flag. Fixed as part of 14882. Patch by "teor". Bugfix
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+ on 0.2.6.3 (f9d57473e1ff on 10 January 2015).
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+
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+ o Minor features (testing, bridges, hidden services):
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+ - Make "bridges+hs" the default test network. This tests almost all
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+ tor functionality during make test-network, while allowing tests
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+ to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
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+ test-network-bridges-hs. Closes tickets 16945 (tor), 16946
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+ (chutney) . Patches by "teor".
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+
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+ o Minor bugfixes:
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+ - Check correctly for windows socket errors in the workqueue
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+ backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
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+ - Ensure that worker threads actually exit when a fatal error or
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+ shutdown is indicated. This doesn't currently affect the behaviour
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+ of Tor, because Tor never indicates fatal error or shutdown except
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+ in its unit tests. Fixes bug 16868; bugfix on 0.2.6.3-alpha.
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+ - Fix an usage message of tor-resolve(1) so that it no longer lists
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+ the removed -F option. Fixes bug 16913; bugfix on
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+ Tor 0.2.2.28-beta.
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+ - Fix the behavior of crypto_time_t when told to consider times
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+ before 1970. (These times were possible when running in a
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+ simulated network environment where time()'s output starts at
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+ zero.) Fixes bug 16980; bugfix on 0.2.7.1-alpha.
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+ - When calling channel_free_list(), avoid calling smartlist_remove()
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+ while inside a FOREACH loop. This partially reverts commit
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+ 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
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+ removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
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+ - When logging malformed hostnames in socks5 requests, respect
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+ SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
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+ - include the TUNING document in our source tarball. It is referred
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+ to in the ChangeLog and an error message. Fixes bug 16929; bugfix
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+ on 0.2.6.1-alpha.
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+
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+ o Minor bugfix (open file limit):
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+ - Fix set_max_file_descriptors() to set by default the max open file
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+ limit to the current limit in case setrlimit() fails so we at
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+ least have a usable value; Fixes bug 16274; bugfix on tor-
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+ 0.2.0.10-alpha. Patch by dgoulet.
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+
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+ o Minor bugfixes (authority):
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+ - Don't assign "HSDir" to a router if it isn't Valid and Running.
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+ Fixes bug 16524; bugfix on 0.2.7.2-alpha.
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+ - Downgrade log messages about Ed25519 key issues, if they are in
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+ old cached router descriptors. Fixes part of bug 16286; bugfix
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+ on 0.2.7.2-alpha.
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+ - When we find an Ed25519 key issue in a cached descriptor, stop
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+ saying the descriptor was just "uploaded". Fixes another part of
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+ bug 16286; bugfix on 0.2.7.2-alpha.
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+
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+ o Minor bugfixes (control port):
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+ - Control port was using set_max_file_descriptors() with a limit set
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+ to 0 to get the max value. A recent fix made this use case return
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+ an error and introduced dead code in that function. This triggered
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+ a warning that our limit (ConnLimit) was invalid but in reality it
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+ was not.
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+
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+ Now, to the control port uses a specific getter function to query
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+ the value and set_max_file_descriptors() should never be used
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+ again for that purpose. Fixes bug 16697; bugfix on 0.2.7.2-alpha.
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+
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+ o Minor bugfixes (Ed25519):
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+ - Fix a memory leak when reading router descriptors with expired
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+ Ed25519 certificate. Fixes bug 16539; bugfix on 0.2.7.2-alpha.
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+
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+ o Minor bugfixes (linux seccomp2 sandbox):
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+ - Allow bridge authorities to run correctly under the seccomp2
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+ sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
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+ - Allow routers with ed25519 keys to run correctly under the
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+ seccomp2 sandbox. Fixes bug 16965; bugfix on 0.2.7.2-alpha.
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+
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+ o Minor bugfixes (relay):
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+ - Unblock threads before releasing the mutex to ensure predictable
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+ scheduling behavior. Fixes bug 16644; bugfix on 0.2.6.3-alpha.
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+
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+ o Code simplification and refactoring:
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+ - Change the function that's called when we need to retry all
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+ downloads so that it only reschedules the downloads to happen
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+ immediately, rather than launching them all at once itself. This
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+ further simplifies Tor's callgraph.
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+ - Move some format-parsing functions out of crypto.c and
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+ crypto_curve25519.c into crypto_format.c and/or util_format.c.
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+ - Move the client-only parts of init_keys() into a separate
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+ function. Closes ticket 16763.
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+ - Simplify the microdesc_free() implementation so that it no longer
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+ appears (to code analysis tools) to potentially invoke a huge
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+ suite of other microdesc functions.
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+ - Simply the control graph further by deferring the inner body of
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+ directory_all_unreachable() into a callback. Closes ticket 16762.
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+ - Treat the loss of an owning controller as equivalent to a SIGTERM
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+ signal. This removes a tiny amount of duplicated code, and
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+ simplifies our callgraph. Closes ticekt 16788.
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+ - When generating an event to send to the controller, we no longer
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+ put the event over the network immediately. Instead, we queue
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+ these events, and use a Libevent callback to deliver them. This
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+ change simplifies Tor's callgraph by reducing the number of
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+ functions from which all other Tor functions are reachable. Closes
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+ ticket 16695.
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+ - Wrap windows-only C files inside '#ifdef _WIN32' so that tools
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+ that try to scan or compile every file on Unix won't decide that
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+ they are broken.
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+
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+ o Code simplifications and refactoring:
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+ - Remove the unused "nulterminate" argument from buf_pullup().
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+
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+ o Documentation:
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+ - Recommend a 40 GB example AccountingMax in torrc.sample rather
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+ than a 4 GB max. Closes ticket 16742.
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+
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+ o Removed code:
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+ - The internal pure-C tor-fw-helper tool is now removed from the Tor
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+ distribution, in favor of the pure-Go clone available from
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+ https://github.com/Yawning/tor-fw-helper . The libraries used by
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+ the C tor-fw-helper are not, in our opinion, very confidence-
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+ inspiring in their secure-proggramming techniques. Closes
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+ ticket 13338.
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+
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+ o Removed features:
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+ - Remove the code that would try to aggressively flush controller
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+ connections while writing to them. This code was introduced in
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+ 0.1.2.7-alpha, in order to keep output buffers from exceeding
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+ their limits. But there is no longer a maximum output buffer size,
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+ and flushing data in this way caused some undesirable recursions
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+ in our call graph. Closes ticket 16480.
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+
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+ o Testing:
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+ - Add a new set of callgraph analysis scripts that use clang to
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+ produce a list of which Tor functions are reachable from which
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+ other Tor functions. We're planning to use these to help simplify
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+ our code structure by identifying illogical dependencies.
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+ - Add new 'test-full' and 'test-full-online' targets to run all
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+ tests, including integration tests with stem and chutney.
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+ - Make the test-workqueue test work on windows by initializing the
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+ network before we begin.
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+ - New make target (make test-network-all) to run multiple applicable
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+ chutney test cases. Patch from Teor; closes 16953.
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+ - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
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+ functions in dns.c. Implements a portion of ticket 16831.
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+ - When building Tor with testing coverage enabled, run Chutney tests
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+ (if any) using the 'tor-cov' coverage binary.
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+ - When running test-network or test-stem, check for the absence of
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+ stem/chutney before doing any build operations.
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+
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+
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Changes in version 0.2.7.2-alpha - 2015-07-27
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This, the second alpha in the Tor 0.2.7 series, has a number of new
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features, including a way to manually pick the number of introduction
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Nick Mathewson