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@@ -1,3 +1,1936 @@ +Changes in version 0.4.1.2-alpha - 2019-06-06 + Tor 0.4.1.2-alpha resolves numerous bugs--some of them from the + previous alpha, and some much older. It also contains minor testing + improvements, and an improvement to the security of our authenticated + SENDME implementation. + + o Major bugfixes (bridges): + - Consider our directory information to have changed when our list + of bridges changes. Previously, Tor would not re-compute the + status of its directory information when bridges changed, and + therefore would not realize that it was no longer able to build + circuits. Fixes part of bug 29875. + - Do not count previously configured working bridges towards our + total of working bridges. Previously, when Tor's list of bridges + changed, it would think that the old bridges were still usable, + and delay fetching router descriptors for the new ones. Fixes part + of bug 29875; bugfix on 0.3.0.1-alpha. + + o Major bugfixes (flow control, SENDME): + - Decrement the stream-level package window after packaging a cell. + Previously, it was done inside a log_debug() call, meaning that if + debug logs were not enabled, the decrement would never happen, and + thus the window would be out of sync with the other end point. + Fixes bug 30628; bugfix on 0.4.1.1-alpha. + + o Major bugfixes (onion service reachability): + - Properly clean up the introduction point map and associated state + when circuits change purpose from onion service circuits to + pathbias, measurement, or other circuit types. This may fix some + instances of introduction point failure. Fixes bug 29034; bugfix + on 0.3.2.1-alpha. + + o Minor features (authenticated SENDME): + - Ensure that there is enough randomness on every circuit to prevent + an attacker from successfully predicting the hashes they will need + to include in authenticated SENDME cells. At a random interval, if + we have not sent randomness already, we now leave some extra space + at the end of a cell that we can fill with random bytes. Closes + ticket 26846. + + o Minor features (continuous integration): + - When running coverage builds on Travis, we now set + TOR_TEST_RNG_SEED, to avoid RNG-based coverage differences. Part + of ticket 28878. + + o Minor features (maintenance): + - Add a new "make autostyle" target that developers can use to apply + all automatic Tor style and consistency conversions to the + codebase. Closes ticket 30539. + + o Minor features (testing): + - The circuitpadding tests now use a reproducible RNG implementation, + so that if a test fails, we can learn why. Part of ticket 28878. + - Tor's tests now support an environment variable, TOR_TEST_RNG_SEED, + to set the RNG seed for tests that use a reproducible RNG. Part of + ticket 28878. + - When running tests in coverage mode, take additional care to make + our coverage deterministic, so that we can accurately track + changes in code coverage. Closes ticket 30519. + + o Minor bugfixes (configuration, proxies): + - Fix a bug that prevented us from supporting SOCKS5 proxies that + want authentication along with configured (but unused!) + ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha. + + o Minor bugfixes (controller): + - POSTDESCRIPTOR requests should work again. Previously, they were + broken if a "purpose=" flag was specified. Fixes bug 30580; bugfix + on 0.4.1.1-alpha. + - Repair the HSFETCH command so that it works again. Previously, it + expected a body when it shouldn't have. Fixes bug 30646; bugfix + on 0.4.1.1-alpha. + + o Minor bugfixes (developer tooling): + - Fix pre-push hook to allow fixup and squash commits when pushing + to non-upstream git remote. Fixes bug 30286; bugfix + on 0.4.0.1-alpha. + + o Minor bugfixes (directory authority): + - Move the "bandwidth-file-headers" line in directory authority + votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix + on 0.3.5.1-alpha. + + o Minor bugfixes (NetBSD): + - Fix usage of minherit() on NetBSD and other platforms that define + MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug + 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell. + + o Minor bugfixes (out-of-memory handler): + - When purging the DNS cache because of an out-of-memory condition, + try purging just the older entries at first. Previously, we would + always purge the whole thing. Fixes bug 29617; bugfix + on 0.3.5.1-alpha. + + o Minor bugfixes (portability): + - Avoid crashing in our tor_vasprintf() implementation on systems + that define neither vasprintf() nor _vscprintf(). (This bug has + been here long enough that we question whether people are running + Tor on such systems, but we're applying the fix out of caution.) + Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by + Tobias Stoeckmann. + + o Minor bugfixes (shutdown, libevent, memory safety): + - Avoid use-after-free bugs when shutting down, by making sure that + we shut down libevent only after shutting down all of its users. + We believe these are harmless in practice, since they only occur + on the shutdown path, and do not involve any attacker-controlled + data. Fixes bug 30629; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (static analysis): + - Fix several spurious Coverity warnings about the unit tests, to + lower our chances of missing real warnings in the future. Fixes + bug 30150; bugfix on 0.3.5.1-alpha and various other Tor versions. + + o Testing: + - Specify torrc paths (with empty files) when launching tor in + integration tests; refrain from reading user and system torrcs. + Resolves issue 29702. + + +Changes in version 0.4.1.1-alpha - 2019-05-22 + This is the first alpha in the 0.4.1.x series. It introduces + lightweight circuit padding to make some onion-service circuits harder + to distinguish, includes a new "authenticated SENDME" feature to make + certain denial-of-service attacks more difficult, and improves + performance in several areas. + + o Major features (circuit padding): + - Onion service clients now add padding cells at the start of their + INTRODUCE and RENDEZVOUS circuits, to make those circuits' traffic + look more like general purpose Exit traffic. The overhead for this + is 2 extra cells in each direction for RENDEZVOUS circuits, and 1 + extra upstream cell and 10 downstream cells for INTRODUCE + circuits. This feature is only enabled when also supported by the + circuit's middle node. (Clients may specify fixed middle nodes + with the MiddleNodes option, and may force-disable this feature + with the CircuitPadding torrc.) Closes ticket 28634. + + o Major features (code organization): + - Tor now includes a generic publish-subscribe message-passing + subsystem that we can use to organize intermodule dependencies. We + hope to use this to reduce dependencies between modules that don't + need to be related, and to generally simplify our codebase. Closes + ticket 28226. + + o Major features (controller protocol): + - Controller commands are now parsed using a generalized parsing + subsystem. Previously, each controller command was responsible for + parsing its own input, which led to strange inconsistencies. + Closes ticket 30091. + + o Major features (flow control): + - Implement authenticated SENDMEs as detailed in proposal 289. A + SENDME cell now includes the digest of the traffic that it + acknowledges, so that once an end point receives the SENDME, it + can confirm the other side's knowledge of the previous cells that + were sent, and prevent certain types of denial-of-service attacks. + This behavior is controlled by two new consensus parameters: see + the proposal for more details. Fixes ticket 26288. + + o Major features (performance): + - Our node selection algorithm now excludes nodes in linear time. + Previously, the algorithm was quadratic, which could slow down + heavily used onion services. Closes ticket 30307. + + o Major features (performance, RNG): + - Tor now constructs a fast secure pseudorandom number generator for + each thread, to use when performance is critical. This PRNG is + based on AES-CTR, using a buffering construction similar to + libottery and the (newer) OpenBSD arc4random() code. It + outperforms OpenSSL 1.1.1a's CSPRNG by roughly a factor of 100 for + small outputs. Although we believe it to be cryptographically + strong, we are only using it when necessary for performance. + Implements tickets 29023 and 29536. + + o Major bugfixes (onion service v3): + - Fix an unreachable bug in which an introduction point could try to + send an INTRODUCE_ACK with a status code that Trunnel would refuse + to encode, leading the relay to assert(). We've consolidated the + ABI values into Trunnel now. Fixes bug 30454; bugfix + on 0.3.0.1-alpha. + - Clients can now handle unknown status codes from INTRODUCE_ACK + cells. (The NACK behavior will stay the same.) This will allow us + to extend status codes in the future without breaking the normal + client behavior. Fixes another part of bug 30454; bugfix + on 0.3.0.1-alpha. + + o Minor features (circuit padding): + - We now use a fast PRNG when scheduling circuit padding. Part of + ticket 28636. + - Allow the padding machine designer to pick the edges of their + histogram instead of trying to compute them automatically using an + exponential formula. Resolves some undefined behavior in the case + of small histograms and allows greater flexibility on machine + design. Closes ticket 29298; bugfix on 0.4.0.1-alpha. + - Allow circuit padding machines to hold a circuit open until they + are done padding it. Closes ticket 28780. + + o Minor features (compile-time modules): + - Add a "--list-modules" command to print a list of which compile- + time modules are enabled. Closes ticket 30452. + + o Minor features (continuous integration): + - Remove sudo configuration lines from .travis.yml as they are no + longer needed with current Travis build environment. Resolves + issue 30213. + - In Travis, show stem's tor log after failure. Closes ticket 30234. + + o Minor features (controller): + - Add onion service version 3 support to the HSFETCH command. + Previously, only version 2 onion services were supported. Closes + ticket 25417. Patch by Neel Chauhan. + + o Minor features (debugging): + - Introduce tor_assertf() and tor_assertf_nonfatal() to enable + logging of additional information during assert failure. Now we + can use format strings to include information for trouble + shooting. Resolves ticket 29662. + + o Minor features (defense in depth): + - In smartlist_remove_keeporder(), set unused pointers to NULL, in + case a bug causes them to be used later. Closes ticket 30176. + Patch from Tobias Stoeckmann. + - Tor now uses a cryptographically strong PRNG even for decisions + that we do not believe are security-sensitive. Previously, for + performance reasons, we had used a trivially predictable linear + congruential generator algorithm for certain load-balancing and + statistical sampling decisions. Now we use our fast RNG in those + cases. Closes ticket 29542. + + o Minor features (developer tools): + - Tor's "practracker" test script now checks for files and functions + that seem too long and complicated. Existing overlong functions + and files are accepted for now, but should eventually be + refactored. Closes ticket 29221. + - Add some scripts used for git maintenance to scripts/git. Closes + ticket 29391. + - Call practracker from pre-push and pre-commit git hooks to let + developers know if they made any code style violations. Closes + ticket 30051. + - Add a script to check that each header has a well-formed and + unique guard macro. Closes ticket 29756. + + o Minor features (geoip): + - Update geoip and geoip6 to the May 13 2019 Maxmind GeoLite2 + Country database. Closes ticket 30522. + + o Minor features (HTTP tunnel): + - Return an informative web page when the HTTPTunnelPort is used as + an HTTP proxy. Closes ticket 27821, patch by "eighthave". + + o Minor features (IPv6, v3 onion services): + - Make v3 onion services put IPv6 addresses in service descriptors. + Before this change, service descriptors only contained IPv4 + addresses. Implements 26992. + + o Minor features (modularity): + - The "--disable-module-dirauth" compile-time option now disables + even more dirauth-only code. Closes ticket 30345. + + o Minor features (performance): + - Use OpenSSL's implementations of SHA3 when available (in OpenSSL + 1.1.1 and later), since they tend to be faster than tiny-keccak. + Closes ticket 28837. + + o Minor features (testing): + - Tor's unit test code now contains helper functions to replace the + PRNG with a deterministic or reproducible version for testing. + Previously, various tests implemented this in various ways. + Implements ticket 29732. + - We now have a script, cov-test-determinism.sh, to identify places + where our unit test coverage has become nondeterministic. Closes + ticket 29436. + - Check that representative subsets of values of `int` and `unsigned + int` can be represented by `void *`. Resolves issue 29537. + + o Minor bugfixes (bridge authority): + - Bridge authorities now set bridges as running or non-running when + about to dump their status to a file. Previously, they set bridges + as running in response to a GETINFO command, but those shouldn't + modify data structures. Fixes bug 24490; bugfix on 0.2.0.13-alpha. + Patch by Neel Chauhan. + + o Minor bugfixes (channel padding statistics): + - Channel padding write totals and padding-enabled totals are now + counted properly in relay extrainfo descriptors. Fixes bug 29231; + bugfix on 0.3.1.1-alpha. + + o Minor bugfixes (circuit padding): + - Add a "CircuitPadding" torrc option to disable circuit padding. + Fixes bug 28693; bugfix on 0.4.0.1-alpha. + - Allow circuit padding machines to specify that they do not + contribute much overhead, and provide consensus flags and torrc + options to force clients to only use these low overhead machines. + Fixes bug 29203; bugfix on 0.4.0.1-alpha. + - Provide a consensus parameter to fully disable circuit padding, to + be used in emergency network overload situations. Fixes bug 30173; + bugfix on 0.4.0.1-alpha. + - The circuit padding subsystem will no longer schedule padding if + dormant mode is enabled. Fixes bug 28636; bugfix on 0.4.0.1-alpha. + - Inspect a circuit-level cell queue before sending padding, to + avoid sending padding while too much data is already queued. Fixes + bug 29204; bugfix on 0.4.0.1-alpha. + - Avoid calling monotime_absolute_usec() in circuit padding machines + that do not use token removal or circuit RTT estimation. Fixes bug + 29085; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (compilation, unusual configurations): + - Avoid failures when building with the ALL_BUGS_ARE_FATAL option + due to missing declarations of abort(), and prevent other such + failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha. + + o Minor bugfixes (controller protocol): + - Teach the controller parser to distinguish an object preceded by + an argument list from one without. Previously, it couldn't + distinguish an argument list from the first line of a multiline + object. Fixes bug 29984; bugfix on 0.2.3.8-alpha. + + o Minor bugfixes (directory authority, ipv6): + - Directory authorities with IPv6 support now always mark themselves + as reachable via IPv6. Fixes bug 24338; bugfix on 0.4.0.2-alpha. + Patch by Neel Chauhan. + + o Minor bugfixes (documentation): + - Improve the documentation for using MapAddress with ".exit". Fixes + bug 30109; bugfix on 0.1.0.1-rc. + - Improve the monotonic time module and function documentation to + explain what "monotonic" actually means, and document some results + that have surprised people. Fixes bug 29640; bugfix + on 0.2.9.1-alpha. + - Use proper formatting when providing an example on quoting options + that contain whitespace. Fixes bug 29635; bugfix on 0.2.3.18-rc. + + o Minor bugfixes (logging): + - Do not log a warning when running with an OpenSSL version other + than the one Tor was compiled with, if the two versions should be + compatible. Previously, we would warn whenever the version was + different. Fixes bug 30190; bugfix on 0.2.4.2-alpha. + - Warn operators when the MyFamily option is set but ContactInfo is + missing, as the latter should be set too. Fixes bug 25110; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (memory leak): + - Avoid a minor memory leak that could occur on relays when failing + to create a "keys" directory. Fixes bug 30148; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (onion services): + - Avoid a GCC 9.1.1 warning (and possible crash depending on libc + implemenation) when failing to load an onion service client + authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha. + - When refusing to launch a controller's HSFETCH request because of + rate-limiting, respond to the controller with a new response, + "QUERY_RATE_LIMITED". Previously, we would log QUERY_NO_HSDIR for + this case. Fixes bug 28269; bugfix on 0.3.1.1-alpha. Patch by + Neel Chauhan. + - When relaunching a circuit to a rendezvous service, mark the + circuit as needing high-uptime routers as appropriate. Fixes bug + 17357; bugfix on 0.4.0.2-alpha. Patch by Neel Chauhan. + - Stop ignoring IPv6 link specifiers sent to v3 onion services. + (IPv6 support for v3 onion services is still incomplete: see + ticket 23493 for details.) Fixes bug 23588; bugfix on + 0.3.2.1-alpha. Patch by Neel Chauhan. + + o Minor bugfixes (onion services, performance): + - When building circuits to onion services, call tor_addr_parse() + less often. Previously, we called tor_addr_parse() in + circuit_is_acceptable() even if its output wasn't used. This + change should improve performance when building circuits. Fixes + bug 22210; bugfix on 0.2.8.12. Patch by Neel Chauhan. + + o Minor bugfixes (performance): + - When checking whether a node is a bridge, use a fast check to make + sure that its identity is set. Previously, we used a constant-time + check, which is not necessary in this case. Fixes bug 30308; + bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (pluggable transports): + - Tor now sets TOR_PT_EXIT_ON_STDIN_CLOSE=1 for client transports as + well as servers. Fixes bug 25614; bugfix on 0.2.7.1-alpha. + + o Minor bugfixes (probability distributions): + - Refactor and improve parts of the probability distribution code + that made Coverity complain. Fixes bug 29805; bugfix + on 0.4.0.1-alpha. + + o Minor bugfixes (python): + - Stop assuming that /usr/bin/python3 exists. For scripts that work + with python2, use /usr/bin/python. Otherwise, use /usr/bin/env + python3. Fixes bug 29913; bugfix on 0.2.5.3-alpha. + + o Minor bugfixes (relay): + - When running as a relay, if IPv6Exit is set to 1 while ExitRelay + is auto, act as if ExitRelay is 1. Previously, we would ignore + IPv6Exit if ExitRelay was 0 or auto. Fixes bug 29613; bugfix on + 0.3.5.1-alpha. Patch by Neel Chauhan. + + o Minor bugfixes (stats): + - When ExtraInfoStatistics is 0, stop including bandwidth usage + statistics, GeoIPFile hashes, ServerTransportPlugin lines, and + bridge statistics by country in extra-info documents. Fixes bug + 29018; bugfix on 0.2.4.1-alpha. + + o Minor bugfixes (testing): + - Call setrlimit() to disable core dumps in test_bt_cl.c. Previously + we used `ulimit -c` in test_bt.sh, which violates POSIX shell + compatibility. Fixes bug 29061; bugfix on 0.3.5.1-alpha. + - Fix some incorrect code in the v3 onion service unit tests. Fixes + bug 29243; bugfix on 0.3.2.1-alpha. + - In the "routerkeys/*" tests, check the return values of mkdir() + for possible failures. Fixes bug 29939; bugfix on 0.2.7.2-alpha. + Found by Coverity as CID 1444254. + - Split test_utils_general() into several smaller test functions. + This makes it easier to perform resource deallocation on assert + failure, and fixes Coverity warnings CID 1444117 and CID 1444118. + Fixes bug 29823; bugfix on 0.2.9.1-alpha. + + o Minor bugfixes (tor-resolve): + - Fix a memory leak in tor-resolve that could happen if Tor gave it + a malformed SOCKS response. (Memory leaks in tor-resolve don't + actually matter, but it's good to fix them anyway.) Fixes bug + 30151; bugfix on 0.4.0.1-alpha. + + o Code simplification and refactoring: + - Abstract out the low-level formatting of replies on the control + port. Implements ticket 30007. + - Add several assertions in an attempt to fix some Coverity + warnings. Closes ticket 30149. + - Introduce a connection_dir_buf_add() helper function that checks + for compress_state of dir_connection_t and automatically writes a + string to directory connection with or without compression. + Resolves issue 28816. + - Make the base32_decode() API return the number of bytes written, + for consistency with base64_decode(). Closes ticket 28913. + - Move most relay-only periodic events out of mainloop.c into the + relay subsystem. Closes ticket 30414. + - Refactor and encapsulate parts of the codebase that manipulate + crypt_path_t objects. Resolves issue 30236. + - Refactor several places in our code that Coverity incorrectly + believed might have memory leaks. Closes ticket 30147. + - Remove redundant return values in crypto_format, and the + associated return value checks elsewhere in the code. Make the + implementations in crypto_format consistent, and remove redundant + code. Resolves ticket 29660. + - Rename tor_mem_is_zero() to fast_mem_is_zero(), to emphasize that + it is not a constant-time function. Closes ticket 30309. + - Replace hs_desc_link_specifier_t with link_specifier_t, and remove + all hs_desc_link_specifier_t-specific code. Fixes bug 22781; + bugfix on 0.3.2.1-alpha. + - Simplify v3 onion service link specifier handling code. Fixes bug + 23576; bugfix on 0.3.2.1-alpha. + - Split crypto_digest.c into NSS code, OpenSSL code, and shared + code. Resolves ticket 29108. + - Split control.c into several submodules, in preparation for + distributing its current responsibilities throughout the codebase. + Closes ticket 29894. + - Start to move responsibility for knowing about periodic events to + the appropriate subsystems, so that the mainloop doesn't need to + know all the periodic events in the rest of the codebase. + Implements tickets 30293 and 30294. + + o Documentation: + - Document how to find git commits and tags for bug fixes in + CodingStandards.md. Update some file documentation. Closes + ticket 30261. + + o Removed features: + - Remove the linux-tor-prio.sh script from contrib/operator-tools + directory. Resolves issue 29434. + - Remove the obsolete OpenSUSE initscript. Resolves issue 30076. + - Remove the obsolete script at contrib/dist/tor.sh.in. Resolves + issue 30075. + + o Code simplification and refactoring (shell scripts): + - Clean up many of our shell scripts to fix shellcheck warnings. + These include autogen.sh (ticket 26069), test_keygen.sh (ticket + 29062), test_switch_id.sh (ticket 29065), test_rebind.sh (ticket + 29063), src/test/fuzz/minimize.sh (ticket 30079), test_rust.sh + (ticket 29064), torify (ticket 29070), asciidoc-helper.sh (29926), + fuzz_multi.sh (30077), fuzz_static_testcases.sh (ticket 29059), + nagios-check-tor-authority-cert (ticket 29071), + src/test/fuzz/fixup_filenames.sh (ticket 30078), test-network.sh + (ticket 29060), test_key_expiration.sh (ticket 30002), + zero_length_keys.sh (ticket 29068), and test_workqueue_*.sh + (ticket 29067). + + o Testing (chutney): + - In "make test-network-all", test IPv6-only v3 single onion + services, using the chutney network single-onion-v23-ipv6-md. + Closes ticket 27251. + + +Changes in version 0.4.0.5 - 2019-05-02 + This is the first stable release in the 0.4.0.x series. It contains + improvements for power management and bootstrap reporting, as well as + preliminary backend support for circuit padding to prevent some kinds + of traffic analysis. It also continues our work in refactoring Tor for + long-term maintainability. + + Per our support policy, we will support the 0.4.0.x series for nine + months, or until three months after the release of a stable 0.4.1.x: + whichever is longer. If you need longer-term support, please stick + with 0.3.5.x, which will we plan to support until Feb 2022. + + Below are the changes since 0.4.0.4-rc. For a complete list of changes + since 0.3.5.7, see the ReleaseNotes file. + + o Minor features (continuous integration): + - In Travis, tell timelimit to use stem's backtrace signals, and + launch python directly from timelimit, so python receives the + signals from timelimit, rather than make. Closes ticket 30117. + + o Minor features (diagnostic): + - Add more diagnostic log messages in an attempt to solve the issue + of NUL bytes appearing in a microdescriptor cache. Related to + ticket 28223. + + o Minor features (testing): + - Use the approx_time() function when setting the "Expires" header + in directory replies, to make them more testable. Needed for + ticket 30001. + + o Minor bugfixes (rust): + - Abort on panic in all build profiles, instead of potentially + unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (shellcheck): + - Look for scripts in their correct locations during "make + shellcheck". Previously we had looked in the wrong place during + out-of-tree builds. Fixes bug 30263; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (testing): + - Check the time in the "Expires" header using approx_time(). Fixes + bug 30001; bugfix on 0.4.0.4-rc. + + o Minor bugfixes (UI): + - Lower log level of unlink() errors during bootstrap. Fixes bug + 29930; bugfix on 0.4.0.1-alpha. + + +Changes in version 0.4.0.4-rc - 2019-04-11 + Tor 0.4.0.4-rc is the first release candidate in its series; it fixes + several bugs from earlier versions, including some that had affected + stability, and one that prevented relays from working with NSS. + + o Major bugfixes (NSS, relay): + - When running with NSS, disable TLS 1.2 ciphersuites that use + SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for + these ciphersuites don't work -- which caused relays to fail to + handshake with one another when these ciphersuites were enabled. + Fixes bug 29241; bugfix on 0.3.5.1-alpha. + + o Minor features (bandwidth authority): + - Make bandwidth authorities ignore relays that are reported in the + bandwidth file with the flag "vote=0". This change allows us to + report unmeasured relays for diagnostic reasons without including + their bandwidth in the bandwidth authorities' vote. Closes + ticket 29806. + - When a directory authority is using a bandwidth file to obtain the + bandwidth values that will be included in the next vote, serve + this bandwidth file at /tor/status-vote/next/bandwidth. Closes + ticket 21377. + + o Minor features (circuit padding): + - Stop warning about undefined behavior in the probability + distribution tests. Float division by zero may technically be + undefined behavior in C, but it's well defined in IEEE 754. + Partial backport of 29298. Closes ticket 29527; bugfix + on 0.4.0.1-alpha. + + o Minor features (continuous integration): + - On Travis Rust builds, cleanup Rust registry and refrain from + caching the "target/" directory to speed up builds. Resolves + issue 29962. + + o Minor features (dormant mode): + - Add a DormantCanceledByStartup option to tell Tor that it should + treat a startup event as cancelling any previous dormant state. + Integrators should use this option with caution: it should only be + used if Tor is being started because of something that the user + did, and not if Tor is being automatically started in the + background. Closes ticket 29357. + + o Minor features (geoip): + - Update geoip and geoip6 to the April 2 2019 Maxmind GeoLite2 + Country database. Closes ticket 29992. + + o Minor features (NSS, diagnostic): + - Try to log an error from NSS (if there is any) and a more useful + description of our situation if we are using NSS and a call to + SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241. + + o Minor bugfixes (security): + - Fix a potential double free bug when reading huge bandwidth files. + The issue is not exploitable in the current Tor network because + the vulnerable code is only reached when directory authorities + read bandwidth files, but bandwidth files come from a trusted + source (usually the authorities themselves). Furthermore, the + issue is only exploitable in rare (non-POSIX) 32-bit architectures, + which are not used by any of the current authorities. Fixes bug + 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by + Tobias Stoeckmann. + - Verify in more places that we are not about to create a buffer + with more than INT_MAX bytes, to avoid possible OOB access in the + event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and + fixed by Tobias Stoeckmann. + + o Minor bugfix (continuous integration): + - Reset coverage state on disk after Travis CI has finished. This + should prevent future coverage merge errors from causing the test + suite for the "process" subsystem to fail. The process subsystem + was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix + on 0.2.9.15. + - Terminate test-stem if it takes more than 9.5 minutes to run. + (Travis terminates the job after 10 minutes of no output.) + Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha. + + o Minor bugfixes (bootstrap reporting): + - During bootstrap reporting, correctly distinguish pluggable + transports from plain proxies. Fixes bug 28925; bugfix + on 0.4.0.1-alpha. + + o Minor bugfixes (C correctness): + - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug + 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning + CID 1444119. + + o Minor bugfixes (circuitpadding testing): + - Minor tweaks to avoid rare test failures related to timers and + monotonic time. Fixes bug 29500; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (directory authorities): + - Actually include the bandwidth-file-digest line in directory + authority votes. Fixes bug 29959; bugfix on 0.4.0.2-alpha. + + o Minor bugfixes (logging): + - On Windows, when errors cause us to reload a consensus from disk, + tell the user that we are retrying at log level "notice". + Previously we only logged this information at "info", which was + confusing because the errors themselves were logged at "warning". + Improves previous fix for 28614. Fixes bug 30004; bugfix + on 0.4.0.2-alpha. + + o Minor bugfixes (pluggable transports): + - Restore old behavior when it comes to discovering the path of a + given Pluggable Transport executable file. A change in + 0.4.0.1-alpha had broken this behavior on paths containing a + space. Fixes bug 29874; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (testing): + - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a + recent test-network.sh to use new chutney features in CI. Fixes + bug 29703; bugfix on 0.2.9.1-alpha. + - Fix a test failure on Windows caused by an unexpected "BUG" + warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix + on 0.2.9.3-alpha. + + o Minor bugfixes (TLS protocol): + - When classifying a client's selection of TLS ciphers, if the + client ciphers are not yet available, do not cache the result. + Previously, we had cached the unavailability of the cipher list + and never looked again, which in turn led us to assume that the + client only supported the ancient V1 link protocol. This, in turn, + was causing Stem integration tests to stall in some cases. Fixes + bug 30021; bugfix on 0.2.4.8-alpha. + + o Code simplification and refactoring: + - Introduce a connection_dir_buf_add() helper function that detects + whether compression is in use, and adds a string accordingly. + Resolves issue 28816. + - Refactor handle_get_next_bandwidth() to use + connection_dir_buf_add(). Implements ticket 29897. + + o Documentation: + - Clarify that Tor performs stream isolation among *Port listeners + by default. Resolves issue 29121. + + +Changes in version 0.4.0.3-alpha - 2019-03-22 + Tor 0.4.0.3-alpha is the third in its series; it fixes several small + bugs from earlier versions. + + o Minor features (address selection): + - Treat the subnet 100.64.0.0/10 as public for some purposes; + private for others. This subnet is the RFC 6598 (Carrier Grade + NAT) IP range, and is deployed by many ISPs as an alternative to + RFC 1918 that does not break existing internal networks. Tor now + blocks SOCKS and control ports on these addresses and warns users + if client ports or ExtORPorts are listening on a RFC 6598 address. + Closes ticket 28525. Patch by Neel Chauhan. + + o Minor features (geoip): + - Update geoip and geoip6 to the March 4 2019 Maxmind GeoLite2 + Country database. Closes ticket 29666. + + o Minor bugfixes (circuitpadding): + - Inspect the circuit-level cell queue before sending padding, to + avoid sending padding when too much data is queued. Fixes bug + 29204; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (logging): + - Correct a misleading error message when IPv4Only or IPv6Only is + used but the resolved address can not be interpreted as an address + of the specified IP version. Fixes bug 13221; bugfix on + 0.2.3.9-alpha. Patch from Kris Katterjohn. + - Log the correct port number for listening sockets when "auto" is + used to let Tor pick the port number. Previously, port 0 was + logged instead of the actual port number. Fixes bug 29144; bugfix + on 0.3.5.1-alpha. Patch from Kris Katterjohn. + - Stop logging a BUG() warning when Tor is waiting for exit + descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (memory management): + - Refactor the shared random state's memory management so that it + actually takes ownership of the shared random value pointers. + Fixes bug 29706; bugfix on 0.2.9.1-alpha. + + o Minor bugfixes (memory management, testing): + - Stop leaking parts of the shared random state in the shared-random + unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha. + + o Minor bugfixes (pluggable transports): + - Fix an assertion failure crash bug when a pluggable transport is + terminated during the bootstrap phase. Fixes bug 29562; bugfix + on 0.4.0.1-alpha. + + o Minor bugfixes (Rust, protover): + - Add a missing "Padding" value to the Rust implementation of + protover. Fixes bug 29631; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (single onion services): + - Allow connections to single onion services to remain idle without + being disconnected. Previously, relays acting as rendezvous points + for single onion services were mistakenly closing idle rendezvous + circuits after 60 seconds, thinking that they were unused + directory-fetching circuits that had served their purpose. Fixes + bug 29665; bugfix on 0.2.1.26. + + o Minor bugfixes (stats): + - When ExtraInfoStatistics is 0, stop including PaddingStatistics in + relay and bridge extra-info documents. Fixes bug 29017; bugfix + on 0.3.1.1-alpha. + + o Minor bugfixes (testing): + - Downgrade some LOG_ERR messages in the address/* tests to + warnings. The LOG_ERR messages were occurring when we had no + configured network. We were failing the unit tests, because we + backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug + 29530; bugfix on 0.3.5.8. + - Fix our gcov wrapper script to look for object files at the + correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha. + - Decrease the false positive rate of stochastic probability + distribution tests. Fixes bug 29693; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (Windows, CI): + - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit + Windows Server 2012 R2 job. The remaining 2 jobs still provide + coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set + fast_finish, so failed jobs terminate the build immediately. Fixes + bug 29601; bugfix on 0.3.5.4-alpha. + + +Changes in version 0.3.5.8 - 2019-02-21 + Tor 0.3.5.8 backports several fixes from later releases, including fixes + for an annoying SOCKS-parsing bug that affected users in earlier 0.3.5.x + releases. + + It also includes a fix for a medium-severity security bug affecting Tor + 0.3.2.1-alpha and later. All Tor instances running an affected release + should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha. + + o Major bugfixes (cell scheduler, KIST, security): + - Make KIST consider the outbuf length when computing what it can + put in the outbuf. Previously, KIST acted as though the outbuf + were empty, which could lead to the outbuf becoming too full. It + is possible that an attacker could exploit this bug to cause a Tor + client or relay to run out of memory and crash. Fixes bug 29168; + bugfix on 0.3.2.1-alpha. This issue is also being tracked as + TROVE-2019-001 and CVE-2019-8955. + + o Major bugfixes (networking, backport from 0.4.0.2-alpha): + - Gracefully handle empty username/password fields in SOCKS5 + username/password auth message and allow SOCKS5 handshake to + continue. Previously, we had rejected these handshakes, breaking + certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha. + + o Minor features (compilation, backport from 0.4.0.2-alpha): + - Compile correctly when OpenSSL is built with engine support + disabled, or with deprecated APIs disabled. Closes ticket 29026. + Patches from "Mangix". + + o Minor features (geoip): + - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2 + Country database. Closes ticket 29478. + + o Minor features (testing, backport from 0.4.0.2-alpha): + - Treat all unexpected ERR and BUG messages as test failures. Closes + ticket 28668. + + o Minor bugfixes (onion service v3, client, backport from 0.4.0.1-alpha): + - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS + connection waiting for a descriptor that we actually have in the + cache. It turns out that this can actually happen, though it is + rare. Now, tor will recover and retry the descriptor. Fixes bug + 28669; bugfix on 0.3.2.4-alpha. + + o Minor bugfixes (IPv6, backport from 0.4.0.1-alpha): + - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the + IPv6 socket was bound using an address family of AF_INET instead + of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from + Kris Katterjohn. + + o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha): + - Update Cargo.lock file to match the version made by the latest + version of Rust, so that "make distcheck" will pass again. Fixes + bug 29244; bugfix on 0.3.3.4-alpha. + + o Minor bugfixes (client, clock skew, backport from 0.4.0.1-alpha): + - Select guards even if the consensus has expired, as long as the + consensus is still reasonably live. Fixes bug 24661; bugfix + on 0.3.0.1-alpha. + + o Minor bugfixes (compilation, backport from 0.4.0.1-alpha): + - Compile correctly on OpenBSD; previously, we were missing some + headers required in order to detect it properly. Fixes bug 28938; + bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn. + + o Minor bugfixes (documentation, backport from 0.4.0.2-alpha): + - Describe the contents of the v3 onion service client authorization + files correctly: They hold public keys, not private keys. Fixes + bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix". + + o Minor bugfixes (logging, backport from 0.4.0.1-alpha): + - Rework rep_hist_log_link_protocol_counts() to iterate through all + link protocol versions when logging incoming/outgoing connection + counts. Tor no longer skips version 5, and we won't have to + remember to update this function when new link protocol version is + developed. Fixes bug 28920; bugfix on 0.2.6.10. + + o Minor bugfixes (logging, backport from 0.4.0.2-alpha): + - Log more information at "warning" level when unable to read a + private key; log more information at "info" level when unable to + read a public key. We had warnings here before, but they were lost + during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (misc, backport from 0.4.0.2-alpha): + - The amount of total available physical memory is now determined + using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM) + when it is defined and a 64-bit variant is not available. Fixes + bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn. + + o Minor bugfixes (onion services, backport from 0.4.0.2-alpha): + - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more + than one private key for a hidden service. Fixes bug 29040; bugfix + on 0.3.5.1-alpha. + - In hs_cache_store_as_client() log an HSDesc we failed to parse at + "debug" level. Tor used to log it as a warning, which caused very + long log lines to appear for some users. Fixes bug 29135; bugfix + on 0.3.2.1-alpha. + - Stop logging "Tried to establish rendezvous on non-OR circuit..." + as a warning. Instead, log it as a protocol warning, because there + is nothing that relay operators can do to fix it. Fixes bug 29029; + bugfix on 0.2.5.7-rc. + + o Minor bugfixes (tests, directory clients, backport from 0.4.0.1-alpha): + - Mark outdated dirservers when Tor only has a reasonably live + consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha. + + o Minor bugfixes (tests, backport from 0.4.0.2-alpha): + - Detect and suppress "bug" warnings from the util/time test on + Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha. + - Do not log an error-level message if we fail to find an IPv6 + network interface from the unit tests. Fixes bug 29160; bugfix + on 0.2.7.3-rc. + + o Minor bugfixes (usability, backport from 0.4.0.1-alpha): + - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate(). + Some users took this phrasing to mean that the mentioned guard was + under their control or responsibility, which it is not. Fixes bug + 28895; bugfix on Tor 0.3.0.1-alpha. + + +Changes in version 0.3.4.11 - 2019-02-21 + Tor 0.3.4.11 is the third stable release in its series. It includes + a fix for a medium-severity security bug affecting Tor 0.3.2.1-alpha and + later. All Tor instances running an affected release should upgrade to + 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha. + + o Major bugfixes (cell scheduler, KIST, security): + - Make KIST consider the outbuf length when computing what it can + put in the outbuf. Previously, KIST acted as though the outbuf + were empty, which could lead to the outbuf becoming too full. It + is possible that an attacker could exploit this bug to cause a Tor + client or relay to run out of memory and crash. Fixes bug 29168; + bugfix on 0.3.2.1-alpha. This issue is also being tracked as + TROVE-2019-001 and CVE-2019-8955. + + o Minor features (geoip): + - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2 + Country database. Closes ticket 29478. + + o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha): + - Update Cargo.lock file to match the version made by the latest + version of Rust, so that "make distcheck" will pass again. Fixes + bug 29244; bugfix on 0.3.3.4-alpha. + + o Minor bugfixes (onion services, backport from 0.4.0.2-alpha): + - Stop logging "Tried to establish rendezvous on non-OR circuit..." + as a warning. Instead, log it as a protocol warning, because there + is nothing that relay operators can do to fix it. Fixes bug 29029; + bugfix on 0.2.5.7-rc. + + +Changes in version 0.3.3.12 - 2019-02-21 + Tor 0.3.3.12 fixes a medium-severity security bug affecting Tor + 0.3.2.1-alpha and later. All Tor instances running an affected release + should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha. + + This release marks the end of support for the Tor 0.3.3.x series. We + recommend that users switch to either the Tor 0.3.4 series (supported + until at least 10 June 2019), or the Tor 0.3.5 series, which will + receive long-term support until at least 1 Feb 2022. + + o Major bugfixes (cell scheduler, KIST, security): + - Make KIST consider the outbuf length when computing what it can + put in the outbuf. Previously, KIST acted as though the outbuf + were empty, which could lead to the outbuf becoming too full. It + is possible that an attacker could exploit this bug to cause a Tor + client or relay to run out of memory and crash. Fixes bug 29168; + bugfix on 0.3.2.1-alpha. This issue is also being tracked as + TROVE-2019-001 and CVE-2019-8955. + + o Minor features (geoip): + - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2 + Country database. Closes ticket 29478. + + o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha): + - Update Cargo.lock file to match the version made by the latest + version of Rust, so that "make distcheck" will pass again. Fixes + bug 29244; bugfix on 0.3.3.4-alpha. + + o Minor bugfixes (onion services, backport from 0.4.0.2-alpha): + - Stop logging "Tried to establish rendezvous on non-OR circuit..." + as a warning. Instead, log it as a protocol warning, because there + is nothing that relay operators can do to fix it. Fixes bug 29029; + bugfix on 0.2.5.7-rc. + + +Changes in version 0.4.0.2-alpha - 2019-02-21 + Tor 0.4.0.2-alpha is the second alpha in its series; it fixes several + bugs from earlier versions, including several that had broken + backward compatibility. + + It also includes a fix for a medium-severity security bug affecting Tor + 0.3.2.1-alpha and later. All Tor instances running an affected release + should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha. + + o Major bugfixes (cell scheduler, KIST, security): + - Make KIST consider the outbuf length when computing what it can + put in the outbuf. Previously, KIST acted as though the outbuf + were empty, which could lead to the outbuf becoming too full. It + is possible that an attacker could exploit this bug to cause a Tor + client or relay to run out of memory and crash. Fixes bug 29168; + bugfix on 0.3.2.1-alpha. This issue is also being tracked as + TROVE-2019-001 and CVE-2019-8955. + + o Major bugfixes (networking): + - Gracefully handle empty username/password fields in SOCKS5 + username/password auth messsage and allow SOCKS5 handshake to + continue. Previously, we had rejected these handshakes, breaking + certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha. + + o Major bugfixes (windows, startup): + - When reading a consensus file from disk, detect whether it was + written in text mode, and re-read it in text mode if so. Always + write consensus files in binary mode so that we can map them into + memory later. Previously, we had written in text mode, which + confused us when we tried to map the file on windows. Fixes bug + 28614; bugfix on 0.4.0.1-alpha. + + o Minor features (compilation): + - Compile correctly when OpenSSL is built with engine support + disabled, or with deprecated APIs disabled. Closes ticket 29026. + Patches from "Mangix". + + o Minor features (developer tooling): + - Check that bugfix versions in changes files look like Tor versions + from the versions spec. Warn when bugfixes claim to be on a future + release. Closes ticket 27761. + - Provide a git pre-commit hook that disallows committing if we have + any failures in our code and changelog formatting checks. It is + now available in scripts/maint/pre-commit.git-hook. Implements + feature 28976. + + o Minor features (directory authority): + - When a directory authority is using a bandwidth file to obtain + bandwidth values, include the digest of that file in the vote. + Closes ticket 26698. + + o Minor features (geoip): + - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2 + Country database. Closes ticket 29478. + + o Minor features (testing): + - Treat all unexpected ERR and BUG messages as test failures. Closes + ticket 28668. + + o Minor bugfixes (build, compatibility, rust): + - Update Cargo.lock file to match the version made by the latest + version of Rust, so that "make distcheck" will pass again. Fixes + bug 29244; bugfix on 0.3.3.4-alpha. + + o Minor bugfixes (compilation): + - Fix compilation warnings in test_circuitpadding.c. Fixes bug + 29169; bugfix on 0.4.0.1-alpha. + - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug + 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn. + + o Minor bugfixes (documentation): + - Describe the contents of the v3 onion service client authorization + files correctly: They hold public keys, not private keys. Fixes + bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix". + + o Minor bugfixes (linux seccomp sandbox): + - Fix startup crash when experimental sandbox support is enabled. + Fixes bug 29150; bugfix on 0.4.0.1-alpha. Patch by Peter Gerber. + + o Minor bugfixes (logging): + - Avoid logging that we are relaxing a circuit timeout when that + timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha. + - Log more information at "warning" level when unable to read a + private key; log more information at "info" level when unable to + read a public key. We had warnings here before, but they were lost + during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (misc): + - The amount of total available physical memory is now determined + using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM) + when it is defined and a 64-bit variant is not available. Fixes + bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn. + + o Minor bugfixes (onion services): + - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more + than one private key for a hidden service. Fixes bug 29040; bugfix + on 0.3.5.1-alpha. + - In hs_cache_store_as_client() log an HSDesc we failed to parse at + "debug" level. Tor used to log it as a warning, which caused very + long log lines to appear for some users. Fixes bug 29135; bugfix + on 0.3.2.1-alpha. + - Stop logging "Tried to establish rendezvous on non-OR circuit..." + as a warning. Instead, log it as a protocol warning, because there + is nothing that relay operators can do to fix it. Fixes bug 29029; + bugfix on 0.2.5.7-rc. + + o Minor bugfixes (scheduler): + - When re-adding channels to the pending list, check the correct + channel's sched_heap_idx. This issue has had no effect in mainline + Tor, but could have led to bugs down the road in improved versions + of our circuit scheduling code. Fixes bug 29508; bugfix + on 0.3.2.10. + + o Minor bugfixes (tests): + - Fix intermittent failures on an adaptive padding test. Fixes one + case of bug 29122; bugfix on 0.4.0.1-alpha. + - Disable an unstable circuit-padding test that was failing + intermittently because of an ill-defined small histogram. Such + histograms will be allowed again after 29298 is implemented. Fixes + a second case of bug 29122; bugfix on 0.4.0.1-alpha. + - Detect and suppress "bug" warnings from the util/time test on + Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha. + - Do not log an error-level message if we fail to find an IPv6 + network interface from the unit tests. Fixes bug 29160; bugfix + on 0.2.7.3-rc. + + o Documentation: + - In the manpage entry describing MapAddress torrc setting, use + example IP addresses from ranges specified for use in documentation + by RFC 5737. Resolves issue 28623. + + o Removed features: + - Remove the old check-tor script. Resolves issue 29072. + + +Changes in version 0.4.0.1-alpha - 2019-01-18 + Tor 0.4.0.1-alpha is the first release in the new 0.4.0.x series. It + introduces improved features for power and bandwidth conservation, + more accurate reporting of bootstrap progress for user interfaces, and + an experimental backend for an exciting new adaptive padding feature. + There is also the usual assortment of bugfixes and minor features, all + described below. + + o Major features (battery management, client, dormant mode): + - When Tor is running as a client, and it is unused for a long time, + it can now enter a "dormant" state. When Tor is dormant, it avoids + network and CPU activity until it is reawoken either by a user + request or by a controller command. For more information, see the + configuration options starting with "Dormant". Implements tickets + 2149 and 28335. + - The client's memory of whether it is "dormant", and how long it + has spent idle, persists across invocations. Implements + ticket 28624. + - There is a DormantOnFirstStartup option that integrators can use + if they expect that in many cases, Tor will be installed but + not used. + + o Major features (bootstrap reporting): + - When reporting bootstrap progress, report the first connection + uniformly, regardless of whether it's a connection for building + application circuits. This allows finer-grained reporting of early + progress than previously possible, with the improvements of ticket + 27169. Closes tickets 27167 and 27103. Addresses ticket 27308. + - When reporting bootstrap progress, treat connecting to a proxy or + pluggable transport as separate from having successfully used that + proxy or pluggable transport to connect to a relay. Closes tickets + 27100 and 28884. + + o Major features (circuit padding): + - Implement preliminary support for the circuit padding portion of + Proposal 254. The implementation supports Adaptive Padding (aka + WTF-PAD) state machines for use between experimental clients and + relays. Support is also provided for APE-style state machines that + use probability distributions instead of histograms to specify + inter-packet delay. At the moment, Tor does not provide any + padding state machines that are used in normal operation: for now, + this feature exists solely for experimentation. Closes + ticket 28142. + + o Major features (refactoring): + - Tor now uses an explicit list of its own subsystems when + initializing and shutting down. Previously, these systems were + managed implicitly in various places throughout the codebase. + (There may still be some subsystems using the old system.) Closes + ticket 28330. + + o Minor features (bootstrap reporting): + - When reporting bootstrap progress, stop distinguishing between + situations where only internal paths are available and situations + where external paths are available. Previously, Tor would often + erroneously report that it had only internal paths. Closes + ticket 27402. + + o Minor features (continuous integration): + - Log Python version during each Travis CI job. Resolves + issue 28551. + + o Minor features (controller): + - Add a DROPOWNERSHIP command to undo the effects of TAKEOWNERSHIP. + Implements ticket 28843. + + o Minor features (developer tooling): + - Provide a git hook script to prevent "fixup!" and "squash!" + commits from ending up in the master branch, as scripts/main/pre- + push.git-hook. Closes ticket 27993. + + o Minor features (directory authority): + - Directory authorities support a new consensus algorithm, under + which the family lines in microdescriptors are encoded in a + canonical form. This change makes family lines more compressible + in transit, and on the client. Closes ticket 28266; implements + proposal 298. + + o Minor features (directory authority, relay): + - Authorities now vote on a "StaleDesc" flag to indicate that a + relay's descriptor is so old that the relay should upload again + soon. Relays treat this flag as a signal to upload a new + descriptor. This flag will eventually let us remove the + 'published' date from routerstatus entries, and make our consensus + diffs much smaller. Closes ticket 26770; implements proposal 293. + + o Minor features (fallback directory mirrors): + - Update the fallback whitelist based on operator opt-ins and opt- + outs. Closes ticket 24805, patch by Phoul. + + o Minor features (FreeBSD): + - On FreeBSD-based systems, warn relay operators if the + "net.inet.ip.random_id" sysctl (IP ID randomization) is disabled. + Closes ticket 28518. + + o Minor features (HTTP standards compliance): + - Stop sending the header "Content-type: application/octet-stream" + along with transparently compressed documents: this confused + browsers. Closes ticket 28100. + + o Minor features (IPv6): + - We add an option ClientAutoIPv6ORPort, to make clients randomly + prefer a node's IPv4 or IPv6 ORPort. The random preference is set + every time a node is loaded from a new consensus or bridge config. + We expect that this option will enable clients to bootstrap more + quickly without having to determine whether they support IPv4, + IPv6, or both. Closes ticket 27490. Patch by Neel Chauhan. + - When using addrs_in_same_network_family(), avoid choosing circuit + paths that pass through the same IPv6 subnet more than once. + Previously, we only checked IPv4 subnets. Closes ticket 24393. + Patch by Neel Chauhan. + + o Minor features (log messages): + - Improve log message in v3 onion services that could print out + negative revision counters. Closes ticket 27707. Patch + by "ffmancera". + + o Minor features (memory usage): + - Save memory by storing microdescriptor family lists with a more + compact representation. Closes ticket 27359. + - Tor clients now use mmap() to read consensus files from disk, so + that they no longer need keep the full text of a consensus in + memory when parsing it or applying a diff. Closes ticket 27244. + + o Minor features (parsing): + - Directory authorities now validate that router descriptors and + ExtraInfo documents are in a valid subset of UTF-8, and reject + them if they are not. Closes ticket 27367. + + o Minor features (performance): + - Cache the results of summarize_protocol_flags(), so that we don't + have to parse the same protocol-versions string over and over. + This should save us a huge number of malloc calls on startup, and + may reduce memory fragmentation with some allocators. Closes + ticket 27225. + - Remove a needless memset() call from get_token_arguments, thereby + speeding up the tokenization of directory objects by about 20%. + Closes ticket 28852. + - Replace parse_short_policy() with a faster implementation, to + improve microdescriptor parsing time. Closes ticket 28853. + - Speed up directory parsing a little by avoiding use of the non- + inlined strcmp_len() function. Closes ticket 28856. + - Speed up microdescriptor parsing by about 30%, to help improve + startup time. Closes ticket 28839. + + o Minor features (pluggable transports): + - Add support for emitting STATUS updates to Tor's control port from + a pluggable transport process. Closes ticket 28846. + - Add support for logging to Tor's logging subsystem from a + pluggable transport process. Closes ticket 28180. + + o Minor features (process management): + - Add a new process API for handling child processes. This new API + allows Tor to have bi-directional communication with child + processes on both Unix and Windows. Closes ticket 28179. + - Use the subsystem manager to initialize and shut down the process + module. Closes ticket 28847. + + o Minor features (relay): + - When listing relay families, list them in canonical form including + the relay's own identity, and try to give a more useful set of + warnings. Part of ticket 28266 and proposal 298. + + o Minor features (required protocols): + - Before exiting because of a missing required protocol, Tor will + now check the publication time of the consensus, and not exit + unless the consensus is newer than the Tor program's own release + date. Previously, Tor would not check the consensus publication + time, and so might exit because of a missing protocol that might + no longer be required in a current consensus. Implements proposal + 297; closes ticket 27735. + + o Minor features (testing): + - Allow a HeartbeatPeriod of less than 30 minutes in testing Tor + networks. Closes ticket 28840. Patch by Rob Jansen. + + o Minor bugfixes (client, clock skew): + - Bootstrap successfully even when Tor's clock is behind the clocks + on the authorities. Fixes bug 28591; bugfix on 0.2.0.9-alpha. + - Select guards even if the consensus has expired, as long as the + consensus is still reasonably live. Fixes bug 24661; bugfix + on 0.3.0.1-alpha. + + o Minor bugfixes (compilation): + - Compile correctly on OpenBSD; previously, we were missing some + headers required in order to detect it properly. Fixes bug 28938; + bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn. + + o Minor bugfixes (directory clients): + - Mark outdated dirservers when Tor only has a reasonably live + consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha. + + o Minor bugfixes (directory mirrors): + - Even when a directory mirror's clock is behind the clocks on the + authorities, we now allow the mirror to serve "future" + consensuses. Fixes bug 28654; bugfix on 0.3.0.1-alpha. + + o Minor bugfixes (DNS): + - Gracefully handle an empty or absent resolve.conf file by falling + back to using "localhost" as a DNS server (and hoping it works). + Previously, we would just stop running as an exit. Fixes bug + 21900; bugfix on 0.2.1.10-alpha. + + o Minor bugfixes (guards): + - In count_acceptable_nodes(), the minimum number is now one bridge + or guard node, and two non-guard nodes for a circuit. Previously, + we had added up the sum of all nodes with a descriptor, but that + could cause us to build failing circuits when we had either too + many bridges or not enough guard nodes. Fixes bug 25885; bugfix on + 0.3.6.1-alpha. Patch by Neel Chauhan. + + o Minor bugfixes (IPv6): + - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the + IPv6 socket was bound using an address family of AF_INET instead + of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from + Kris Katterjohn. + + o Minor bugfixes (logging): + - Rework rep_hist_log_link_protocol_counts() to iterate through all + link protocol versions when logging incoming/outgoing connection + counts. Tor no longer skips version 5, and we won't have to + remember to update this function when new link protocol version is + developed. Fixes bug 28920; bugfix on 0.2.6.10. + + o Minor bugfixes (networking): + - Introduce additional checks into tor_addr_parse() to reject + certain incorrect inputs that previously were not detected. Fixes + bug 23082; bugfix on 0.2.0.10-alpha. + + o Minor bugfixes (onion service v3, client): + - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS + connection waiting for a descriptor that we actually have in the + cache. It turns out that this can actually happen, though it is + rare. Now, tor will recover and retry the descriptor. Fixes bug + 28669; bugfix on 0.3.2.4-alpha. + + o Minor bugfixes (periodic events): + - Refrain from calling routerlist_remove_old_routers() from + check_descriptor_callback(). Instead, create a new hourly periodic + event. Fixes bug 27929; bugfix on 0.2.8.1-alpha. + + o Minor bugfixes (pluggable transports): + - Make sure that data is continously read from standard output and + standard error pipes of a pluggable transport child-process, to + avoid deadlocking when a pipe's buffer is full. Fixes bug 26360; + bugfix on 0.2.3.6-alpha. + + o Minor bugfixes (unit tests): + - Instead of relying on hs_free_all() to clean up all onion service + objects in test_build_descriptors(), we now deallocate them one by + one. This lets Coverity know that we are not leaking memory there + and fixes CID 1442277. Fixes bug 28989; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (usability): + - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate(). + Some users took this phrasing to mean that the mentioned guard was + under their control or responsibility, which it is not. Fixes bug + 28895; bugfix on Tor 0.3.0.1-alpha. + + o Code simplification and refactoring: + - Reimplement NETINFO cell parsing and generation to rely on + trunnel-generated wire format handling code. Closes ticket 27325. + - Remove unnecessary unsafe code from the Rust macro "cstr!". Closes + ticket 28077. + - Rework SOCKS wire format handling to rely on trunnel-generated + parsing/generation code. Resolves ticket 27620. + - Split out bootstrap progress reporting from control.c into a + separate file. Part of ticket 27402. + - The .may_include files that we use to describe our directory-by- + directory dependency structure now describe a noncircular + dependency graph over the directories that they cover. Our + checkIncludes.py tool now enforces this noncircularity. Closes + ticket 28362. + + o Documentation: + - Mention that you cannot add a new onion service if Tor is already + running with Sandbox enabled. Closes ticket 28560. + - Improve ControlPort documentation. Mention that it accepts + address:port pairs, and can be used multiple times. Closes + ticket 28805. + - Document the exact output of "tor --version". Closes ticket 28889. + + o Removed features: + - Stop responding to the 'GETINFO status/version/num-concurring' and + 'GETINFO status/version/num-versioning' control port commands, as + those were deprecated back in 0.2.0.30. Also stop listing them in + output of 'GETINFO info/names'. Resolves ticket 28757. + - The scripts used to generate and maintain the list of fallback + directories have been extracted into a new "fallback-scripts" + repository. Closes ticket 27914. + + o Testing: + - Run shellcheck for scripts in the in scripts/ directory. Closes + ticket 28058. + - Add unit tests for tokenize_string() and get_next_token() + functions. Resolves ticket 27625. + + o Code simplification and refactoring (onion service v3): + - Consolidate the authorized client descriptor cookie computation + code from client and service into one function. Closes + ticket 27549. + + o Code simplification and refactoring (shell scripts): + - Cleanup scan-build.sh to silence shellcheck warnings. Closes + ticket 28007. + - Fix issues that shellcheck found in chutney-git-bisect.sh. + Resolves ticket 28006. + - Fix issues that shellcheck found in updateRustDependencies.sh. + Resolves ticket 28012. + - Fix shellcheck warnings in cov-diff script. Resolves issue 28009. + - Fix shellcheck warnings in run_calltool.sh. Resolves ticket 28011. + - Fix shellcheck warnings in run_trunnel.sh. Resolves issue 28010. + - Fix shellcheck warnings in scripts/test/coverage. Resolves + issue 28008. + + +Changes in version 0.3.3.11 - 2019-01-07 + Tor 0.3.3.11 backports numerous fixes from later versions of Tor. + numerous fixes, including an important fix for anyone using OpenSSL + 1.1.1. Anyone running an earlier version of Tor 0.3.3 should upgrade + to this version, or to a later series. + + As a reminder, support the Tor 0.3.3 series will end on 22 Feb 2019. + We anticipate that this will be the last release of Tor 0.3.3, unless + some major bug is before then. Some time between now and then, users + should switch to either the Tor 0.3.4 series (supported until at least + 10 June 2019), or the Tor 0.3.5 series, which will receive long-term + support until at least 1 Feb 2022. + + o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha): + - Fix our usage of named groups when running as a TLS 1.3 client in + OpenSSL 1.1.1. Previously, we only initialized EC groups when + running as a relay, which caused clients to fail to negotiate TLS + 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3 + support was added). + + o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha): + - Fix a use-after-free error that could be caused by passing Tor an + impossible set of options that would fail during options_act(). + Fixes bug 27708; bugfix on 0.3.3.1-alpha. + + o Minor features (continuous integration, backport from 0.3.5.1-alpha): + - Only run one online rust build in Travis, to reduce network + errors. Skip offline rust builds on Travis for Linux gcc, because + they're redundant. Implements ticket 27252. + - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a + duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on + Linux with default settings, because all the non-default builds + use gcc on Linux. Implements ticket 27252. + + o Minor features (continuous integration, backport from 0.3.5.3-alpha): + - Use the Travis Homebrew addon to install packages on macOS during + Travis CI. The package list is the same, but the Homebrew addon + does not do a `brew update` by default. Implements ticket 27738. + + o Minor features (fallback directory list, backport from 0.3.5.6-rc): + - Replace the 150 fallbacks originally introduced in Tor + 0.3.3.1-alpha in January 2018 (of which ~115 were still + functional), with a list of 157 fallbacks (92 new, 65 existing, 85 + removed) generated in December 2018. Closes ticket 24803. + + o Minor features (geoip): + - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2 + Country database. Closes ticket 29012. + + o Minor features (OpenSSL bug workaround, backport from 0.3.5.7): + - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3 + key export function from handling long labels. When this bug is + detected, Tor will disable TLS 1.3. We recommend upgrading to a + version of OpenSSL without this bug when it becomes available. + Closes ticket 28973. + + o Minor bugfixes (relay statistics, backport from 0.3.5.7): + - Update relay descriptor on bandwidth changes only when the uptime + is smaller than 24h, in order to reduce the efficiency of guard + discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha. + + o Minor bugfixes (C correctness, backport from 0.3.5.4-alpha): + - Avoid undefined behavior in an end-of-string check when parsing + the BEGIN line in a directory object. Fixes bug 28202; bugfix + on 0.2.0.3-alpha. + + o Minor bugfixes (code safety, backport from 0.3.5.3-alpha): + - Rewrite our assertion macros so that they no longer suppress the + compiler's -Wparentheses warnings. Fixes bug 27709; bugfix + + o Minor bugfixes (compilation, backport from 0.3.5.5-alpha): + - Initialize a variable unconditionally in aes_new_cipher(), since + some compilers cannot tell that we always initialize it before + use. Fixes bug 28413; bugfix on 0.2.9.3-alpha. + + o Minor bugfixes (directory authority, backport from 0.3.5.4-alpha): + - Log additional info when we get a relay that shares an ed25519 ID + with a different relay, instead making a BUG() warning. Fixes bug + 27800; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha): + - When a user requests a group-readable DataDirectory, give it to + them. Previously, when the DataDirectory and the CacheDirectory + were the same, the default setting (0) for + CacheDirectoryGroupReadable would override the setting for + DataDirectoryGroupReadable. Fixes bug 26913; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha): + - When the onion service directory can't be created or has the wrong + permissions, do not log a stack trace. Fixes bug 27335; bugfix + on 0.3.2.1-alpha. + + o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha): + - Close all SOCKS request (for the same .onion) if the newly fetched + descriptor is unusable. Before that, we would close only the first + one leaving the other hanging and let to time out by themselves. + Fixes bug 27410; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha): + - Don't warn so loudly when Tor is unable to decode an onion + descriptor. This can now happen as a normal use case if a client + gets a descriptor with client authorization but the client is not + authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc): + - When deleting an ephemeral onion service (DEL_ONION), do not close + any rendezvous circuits in order to let the existing client + connections finish by themselves or closed by the application. The + HS v2 is doing that already so now we have the same behavior for + all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (HTTP tunnel): + - Fix a bug warning when closing an HTTP tunnel connection due to + an HTTP request we couldn't handle. Fixes bug 26470; bugfix on + 0.3.2.1-alpha. + + o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha): + - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419; + bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger. + + o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha): + - Ensure circuitmux queues are empty before scheduling or sending + padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha. + + o Minor bugfixes (protover, backport from 0.3.5.3-alpha): + - Reject protocol names containing bytes other than alphanumeric + characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix + on 0.2.9.4-alpha. + + o Minor bugfixes (rust, backport from 0.3.5.1-alpha): + - Compute protover votes correctly in the rust version of the + protover code. Previously, the protover rewrite in 24031 allowed + repeated votes from the same voter for the same protocol version + to be counted multiple times in protover_compute_vote(). Fixes bug + 27649; bugfix on 0.3.3.5-rc. + - Reject protover names that contain invalid characters. Fixes bug + 27687; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (rust, backport from 0.3.5.2-alpha): + - protover_all_supported() would attempt to allocate up to 16GB on + some inputs, leading to a potential memory DoS. Fixes bug 27206; + bugfix on 0.3.3.5-rc. + + o Minor bugfixes (rust, backport from 0.3.5.4-alpha): + - Fix a potential null dereference in protover_all_supported(). Add + a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha. + - Return a string that can be safely freed by C code, not one + created by the rust allocator, in protover_all_supported(). Fixes + bug 27740; bugfix on 0.3.3.1-alpha. + - Fix an API mismatch in the rust implementation of + protover_compute_vote(). This bug could have caused crashes on any + directory authorities running Tor with Rust (which we do not yet + recommend). Fixes bug 27741; bugfix on 0.3.3.6. + + o Minor bugfixes (testing, backport from 0.3.5.1-alpha): + - If a unit test running in a subprocess exits abnormally or with a + nonzero status code, treat the test as having failed, even if the + test reported success. Without this fix, memory leaks don't cause + the tests to fail, even with LeakSanitizer. Fixes bug 27658; + bugfix on 0.2.2.4-alpha. + + o Minor bugfixes (testing, backport from 0.3.5.4-alpha): + - Treat backtrace test failures as expected on BSD-derived systems + (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808. + (FreeBSD failures have been treated as expected since 18204 in + 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha. + + o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc): + - Stop leaking memory in an entry guard unit test. Fixes bug 28554; + bugfix on 0.3.0.1-alpha. + + +Changes in version 0.3.4.10 - 2019-01-07 + Tor 0.3.4.9 is the second stable release in its series; it backports + numerous fixes, including an important fix for relays, and for anyone + using OpenSSL 1.1.1. Anyone running an earlier version of Tor 0.3.4 + should upgrade. + + As a reminder, the Tor 0.3.4 series will be supported until 10 June + 2019. Some time between now and then, users should switch to the Tor + 0.3.5 series, which will receive long-term support until at least 1 + Feb 2022. + + o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha): + - Fix our usage of named groups when running as a TLS 1.3 client in + OpenSSL 1.1.1. Previously, we only initialized EC groups when + running as a relay, which caused clients to fail to negotiate TLS + 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3 + support was added). + + o Major bugfixes (relay, directory, backport from 0.3.5.7): + - Always reactivate linked connections in the main loop so long as + any linked connection has been active. Previously, connections + serving directory information wouldn't get reactivated after the + first chunk of data was sent (usually 32KB), which would prevent + clients from bootstrapping. Fixes bug 28912; bugfix on + 0.3.4.1-alpha. Patch by "cypherpunks3". + + o Minor features (continuous integration, Windows, backport from 0.3.5.6-rc): + - Always show the configure and test logs, and upload them as build + artifacts, when building for Windows using Appveyor CI. + Implements 28459. + + o Minor features (controller, backport from 0.3.5.1-alpha): + - For purposes of CIRC_BW-based dropped cell detection, track half- + closed stream ids, and allow their ENDs, SENDMEs, DATA and path + bias check cells to arrive without counting it as dropped until + either the END arrives, or the windows are empty. Closes + ticket 25573. + + o Minor features (fallback directory list, backport from 0.3.5.6-rc): + - Replace the 150 fallbacks originally introduced in Tor + 0.3.3.1-alpha in January 2018 (of which ~115 were still + functional), with a list of 157 fallbacks (92 new, 65 existing, 85 + removed) generated in December 2018. Closes ticket 24803. + + o Minor features (geoip): + - Update geoip and geoip6 to the November 6 2018 Maxmind GeoLite2 + Country database. Closes ticket 28395. + + o Minor features (OpenSSL bug workaround, backport from 0.3.5.7): + - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3 + key export function from handling long labels. When this bug is + detected, Tor will disable TLS 1.3. We recommend upgrading to a + version of OpenSSL without this bug when it becomes available. + Closes ticket 28973. + + o Minor bugfixes (compilation, backport from 0.3.5.5-alpha): + - Initialize a variable unconditionally in aes_new_cipher(), since + some compilers cannot tell that we always initialize it before + use. Fixes bug 28413; bugfix on 0.2.9.3-alpha. + + o Minor bugfixes (connection, relay, backport from 0.3.5.5-alpha): + - Avoid a logging a BUG() stacktrace when closing connection held + open because the write side is rate limited but not the read side. + Now, the connection read side is simply shut down until Tor is + able to flush the connection and close it. Fixes bug 27750; bugfix + on 0.3.4.1-alpha. + + o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.5-alpha): + - Manually configure the zstd compiler options, when building using + mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does + not come with a pkg-config file. Fixes bug 28454; bugfix + on 0.3.4.1-alpha. + - Stop using an external OpenSSL install, and stop installing MSYS2 + packages, when building using mingw on Appveyor Windows CI. Fixes + bug 28399; bugfix on 0.3.4.1-alpha. + + o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.6-rc): + - Explicitly specify the path to the OpenSSL library and do not + download OpenSSL from Pacman, but instead use the library that is + already provided by AppVeyor. Fixes bug 28574; bugfix on master. + + o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha): + - When a user requests a group-readable DataDirectory, give it to + them. Previously, when the DataDirectory and the CacheDirectory + were the same, the default setting (0) for + CacheDirectoryGroupReadable would override the setting for + DataDirectoryGroupReadable. Fixes bug 26913; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha): + - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419; + bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger. + + o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha): + - Don't warn so loudly when Tor is unable to decode an onion + descriptor. This can now happen as a normal use case if a client + gets a descriptor with client authorization but the client is not + authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc): + - When deleting an ephemeral onion service (DEL_ONION), do not close + any rendezvous circuits in order to let the existing client + connections finish by themselves or closed by the application. The + HS v2 is doing that already so now we have the same behavior for + all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (relay statistics, backport from 0.3.5.7): + - Update relay descriptor on bandwidth changes only when the uptime + is smaller than 24h, in order to reduce the efficiency of guard + discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha. + + o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc): + - Stop leaking memory in an entry guard unit test. Fixes bug 28554; + bugfix on 0.3.0.1-alpha. + + +Changes in version 0.3.5.7 - 2019-01-07 + Tor 0.3.5.7 is the first stable release in its series; it includes + compilation and portability fixes, and a fix for a severe problem + affecting directory caches. + + The Tor 0.3.5 series includes several new features and performance + improvements, including client authorization for v3 onion services, + cleanups to bootstrap reporting, support for improved bandwidth- + measurement tools, experimental support for NSS in place of OpenSSL, + and much more. It also begins a full reorganization of Tor's code + layout, for improved modularity and maintainability in the future. + Finally, there is the usual set of performance improvements and + bugfixes that we try to do in every release series. + + There are a couple of changes in the 0.3.5 that may affect + compatibility. First, the default version for newly created onion + services is now v3. Use the HiddenServiceVersion option if you want to + override this. Second, some log messages related to bootstrapping have + changed; if you use stem, you may need to update to the latest version + so it will recognize them. + + We have designated 0.3.5 as a "long-term support" (LTS) series: we + will continue to patch major bugs in typical configurations of 0.3.5 + until at least 1 Feb 2022. (We do not plan to provide long-term + support for embedding, Rust support, NSS support, running a directory + authority, or unsupported platforms. For these, you will need to stick + with the latest stable release.) + + Below are the changes since 0.3.5.6-rc. For a complete list of changes + since 0.3.4.9, see the ReleaseNotes file. + + o Major bugfixes (relay, directory): + - Always reactivate linked connections in the main loop so long as + any linked connection has been active. Previously, connections + serving directory information wouldn't get reactivated after the + first chunk of data was sent (usually 32KB), which would prevent + clients from bootstrapping. Fixes bug 28912; bugfix on + 0.3.4.1-alpha. Patch by "cypherpunks3". + + o Minor features (compilation): + - When possible, place our warning flags in a separate file, to + avoid flooding verbose build logs. Closes ticket 28924. + + o Minor features (geoip): + - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2 + Country database. Closes ticket 29012. + + o Minor features (OpenSSL bug workaround): + - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3 + key export function from handling long labels. When this bug is + detected, Tor will disable TLS 1.3. We recommend upgrading to a + version of OpenSSL without this bug when it becomes available. + Closes ticket 28973. + + o Minor features (performance): + - Remove about 96% of the work from the function that we run at + startup to test our curve25519_basepoint implementation. Since + this function has yet to find an actual failure, we now only run + it for 8 iterations instead of 200. Based on our profile + information, this change should save around 8% of our startup time + on typical desktops, and may have a similar effect on other + platforms. Closes ticket 28838. + - Stop re-validating our hardcoded Diffie-Hellman parameters on + every startup. Doing this wasted time and cycles, especially on + low-powered devices. Closes ticket 28851. + + o Minor bugfixes (compilation): + - Fix compilation for Android by adding a missing header to + freespace.c. Fixes bug 28974; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (correctness): + - Fix an unreached code path where we checked the value of + "hostname" inside send_resolved_hostname_cell(). Previously, we + used it before checking it; now we check it first. Fixes bug + 28879; bugfix on 0.1.2.7-alpha. + + o Minor bugfixes (testing): + - Make sure that test_rebind.py actually obeys its timeout, even + when it receives a large number of log messages. Fixes bug 28883; + bugfix on 0.3.5.4-alpha. + - Stop running stem's unit tests as part of "make test-stem", but + continue to run stem's unit and online tests during "make test- + stem-full". Fixes bug 28568; bugfix on 0.2.6.3-alpha. + + o Minor bugfixes (windows services): + - Make Tor start correctly as an NT service again: previously it was + broken by refactoring. Fixes bug 28612; bugfix on 0.3.5.3-alpha. + + o Code simplification and refactoring: + - When parsing a port configuration, make it more obvious to static + analyzer tools that we always initialize the address. Closes + ticket 28881. + + +Changes in version 0.3.5.6-rc - 2018-12-18 + Tor 0.3.5.6-rc fixes numerous small bugs in earlier versions of Tor. + It is the first release candidate in the 0.3.5.x series; if no further + huge bugs are found, our next release may be the stable 0.3.5.x. + + o Minor features (continuous integration, Windows): + - Always show the configure and test logs, and upload them as build + artifacts, when building for Windows using Appveyor CI. + Implements 28459. + + o Minor features (fallback directory list): + - Replace the 150 fallbacks originally introduced in Tor + 0.3.3.1-alpha in January 2018 (of which ~115 were still + functional), with a list of 157 fallbacks (92 new, 65 existing, 85 + removed) generated in December 2018. Closes ticket 24803. + + o Minor features (geoip): + - Update geoip and geoip6 to the December 5 2018 Maxmind GeoLite2 + Country database. Closes ticket 28744. + + o Minor bugfixes (compilation): + - Add missing dependency on libgdi32.dll for tor-print-ed-signing- + cert.exe on Windows. Fixes bug 28485; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (continuous integration, Windows): + - Explicitly specify the path to the OpenSSL library and do not + download OpenSSL from Pacman, but instead use the library that is + already provided by AppVeyor. Fixes bug 28574; bugfix on master. + + o Minor bugfixes (onion service v3): + - When deleting an ephemeral onion service (DEL_ONION), do not close + any rendezvous circuits in order to let the existing client + connections finish by themselves or closed by the application. The + HS v2 is doing that already so now we have the same behavior for + all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (restart-in-process, boostrap): + - Add missing resets of bootstrap tracking state when shutting down + (regression caused by ticket 27169). Fixes bug 28524; bugfix + on 0.3.5.1-alpha. + + o Minor bugfixes (testing): + - Use a separate DataDirectory for the test_rebind script. + Previously, this script would run using the default DataDirectory, + and sometimes fail. Fixes bug 28562; bugfix on 0.3.5.1-alpha. + Patch from Taylor R Campbell. + - Stop leaking memory in an entry guard unit test. Fixes bug 28554; + bugfix on 0.3.0.1-alpha. + + o Minor bugfixes (Windows): + - Correctly identify Windows 8.1, Windows 10, and Windows Server + 2008 and later from their NT versions. Fixes bug 28096; bugfix on + 0.2.2.34; reported by Keifer Bly. + - On recent Windows versions, the GetVersionEx() function may report + an earlier Windows version than the running OS. To avoid user + confusion, add "[or later]" to Tor's version string on affected + versions of Windows. Fixes bug 28096; bugfix on 0.2.2.34; reported + by Keifer Bly. + - Remove Windows versions that were never supported by the + GetVersionEx() function. Stop duplicating the latest Windows + version in get_uname(). Fixes bug 28096; bugfix on 0.2.2.34; + reported by Keifer Bly. + + o Testing: + - Increase logging and tag all log entries with timestamps in + test_rebind.py. Provides diagnostics for issue 28229. + + o Code simplification and refactoring (shared random, dirauth): + - Change many tor_assert() to use BUG() instead. The idea is to not + crash a dirauth but rather scream loudly with a stacktrace and let + it continue run. The shared random subsystem is very resilient and + if anything wrong happens with it, at worst a non coherent value + will be put in the vote and discarded by the other authorities. + Closes ticket 19566. + + o Documentation (onion services): + - Document in the man page that changing ClientOnionAuthDir value or + adding a new file in the directory will not work at runtime upon + sending a HUP if Sandbox 1. Closes ticket 28128. + - Note in the man page that the only real way to fully revoke an + onion service v3 client authorization is by restarting the tor + process. Closes ticket 28275. + + +Changes in version 0.3.5.5-alpha - 2018-11-16 + Tor 0.3.5.5-alpha includes numerous bugfixes on earlier releases, + including several that we hope to backport to older release series in + the future. + + o Major bugfixes (OpenSSL, portability): + - Fix our usage of named groups when running as a TLS 1.3 client in + OpenSSL 1.1.1. Previously, we only initialized EC groups when + running as a relay, which caused clients to fail to negotiate TLS + 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3 + support was added). + + o Minor features (geoip): + - Update geoip and geoip6 to the November 6 2018 Maxmind GeoLite2 + Country database. Closes ticket 28395. + + o Minor bugfixes (compilation): + - Initialize a variable unconditionally in aes_new_cipher(), since + some compilers cannot tell that we always initialize it before + use. Fixes bug 28413; bugfix on 0.2.9.3-alpha. + + o Minor bugfixes (connection, relay): + - Avoid a logging a BUG() stacktrace when closing connection held + open because the write side is rate limited but not the read side. + Now, the connection read side is simply shut down until Tor is + able to flush the connection and close it. Fixes bug 27750; bugfix + on 0.3.4.1-alpha. + + o Minor bugfixes (continuous integration, Windows): + - Manually configure the zstd compiler options, when building using + mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does + not come with a pkg-config file. Fixes bug 28454; bugfix + on 0.3.4.1-alpha. + - Stop using an external OpenSSL install, and stop installing MSYS2 + packages, when building using mingw on Appveyor Windows CI. Fixes + bug 28399; bugfix on 0.3.4.1-alpha. + + o Minor bugfixes (documentation): + - Make Doxygen work again after the code movement in the 0.3.5 + source tree. Fixes bug 28435; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (Linux seccomp2 sandbox): + - Permit the "shutdown()" system call, which is apparently used by + OpenSSL under some circumstances. Fixes bug 28183; bugfix + on 0.2.5.1-alpha. + + o Minor bugfixes (logging): + - Stop talking about the Named flag in log messages. Clients have + ignored the Named flag since 0.3.2. Fixes bug 28441; bugfix + on 0.3.2.1-alpha. + + o Minor bugfixes (memory leaks): + - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419; + bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger. + + o Minor bugfixes (onion services): + - On an intro point for a version 3 onion service, stop closing + introduction circuits on an NACK. This lets the client decide + whether to reuse the circuit or discard it. Previously, we closed + intro circuits when sending NACKs. Fixes bug 27841; bugfix on + 0.3.2.1-alpha. Patch by Neel Chaunan. + - When replacing a descriptor in the client cache, make sure to + close all client introduction circuits for the old descriptor, so + we don't end up with unusable leftover circuits. Fixes bug 27471; + bugfix on 0.3.2.1-alpha. + + Changes in version 0.3.5.4-alpha - 2018-11-08 Tor 0.3.5.4-alpha includes numerous bugfixes on earlier versions and improves our continuous integration support. It continues our attempts |