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Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 5056 |
1 files changed, 5050 insertions, 6 deletions
@@ -1,3 +1,5048 @@ +Changes in version 0.4.3.5 - 2020-05-15 + Tor 0.4.3.5 is the first stable release in the 0.4.3.x series. This + series adds support for building without relay code enabled, and + implements functionality needed for OnionBalance with v3 onion + services. It includes significant refactoring of our configuration and + controller functionality, and fixes numerous smaller bugs and + performance issues. + + Per our support policy, we support each stable release series for nine + months after its first stable release, or three months after the first + stable release of the next series: whichever is longer. This means + that 0.4.3.x will be supported until around February 2021--later, if + 0.4.4.x is later than anticipated. + + Note also that support for 0.4.1.x is about to end on May 20 of this + year; 0.4.2.x will be supported until September 15. We still plan to + continue supporting 0.3.5.x, our long-term stable series, until + Feb 2022. + + Below are the changes since 0.4.3.4-rc. For a complete list of changes + since 0.4.2.6, see the ReleaseNotes file. + + o Minor bugfixes (compiler compatibility): + - Avoid compiler warnings from Clang 10 related to the use of GCC- + style "/* falls through */" comments. Both Clang and GCC allow + __attribute__((fallthrough)) instead, so that's what we're using + now. Fixes bug 34078; bugfix on 0.3.1.3-alpha. + - Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix + on 0.4.0.3-alpha. + + o Minor bugfixes (logging): + - Stop truncating IPv6 addresses and ports in channel and connection + logs. Fixes bug 33918; bugfix on 0.2.4.4-alpha. + - Fix a logic error in a log message about whether an address was + invalid. Previously, the code would never report that onion + addresses were onion addresses. Fixes bug 34131; bugfix + on 0.4.3.1-alpha. + + +Changes in version 0.4.3.4-rc - 2020-04-13 + Tor 0.4.3.4-rc is the first release candidate in its series. It fixes + several bugs from earlier versions, including one affecting DoS + defenses on bridges using pluggable transports. + + o Major bugfixes (DoS defenses, bridges, pluggable transport): + - Fix a bug that was preventing DoS defenses from running on bridges + with a pluggable transport. Previously, the DoS subsystem was not + given the transport name of the client connection, thus failed to + find the GeoIP cache entry for that client address. Fixes bug + 33491; bugfix on 0.3.3.2-alpha. + + o Minor feature (sendme, flow control): + - Default to sending SENDME version 1 cells. (Clients are already + sending these, because of a consensus parameter telling them to do + so: this change only affects what clients would do if the + consensus didn't contain a recommendation.) Closes ticket 33623. + + o Minor features (testing): + - The unit tests now support a "TOR_SKIP_TESTCASES" environment + variable to specify a list of space-separated test cases that + should not be executed. We will use this to disable certain tests + that are failing on Appveyor because of mismatched OpenSSL + libraries. Part of ticket 33643. + + o Minor bugfixes (--disable-module-relay): + - Fix an assertion failure when Tor is built without the relay + module, and then invoked with the "User" option. Fixes bug 33668; + bugfix on 0.4.3.1-alpha. + + o Minor bugfixes (--disable-module-relay,--disable-module-dirauth): + - Set some output arguments in the relay and dirauth module stubs, + to guard against future stub argument handling bugs like 33668. + Fixes bug 33674; bugfix on 0.4.3.1-alpha. + + o Minor bugfixes (build system): + - Correctly output the enabled module in the configure summary. + Before that, the list shown was just plain wrong. Fixes bug 33646; + bugfix on 0.4.3.2-alpha. + + o Minor bugfixes (client, IPv6): + - Stop forcing all non-SocksPorts to prefer IPv6 exit connections. + Instead, prefer IPv6 connections by default, but allow users to + change their configs using the "NoPreferIPv6" port flag. Fixes bug + 33608; bugfix on 0.4.3.1-alpha. + - Revert PreferIPv6 set by default on the SocksPort because it broke + the torsocks use case. Tor doesn't have a way for an application + to request the hostname to be resolved for a specific IP version, + but torsocks requires that. Up until now, IPv4 was used by default + so torsocks is expecting that, and can't handle a possible IPv6 + being returned. Fixes bug 33804; bugfix on 0.4.3.1-alpha. + + o Minor bugfixes (key portability): + - When reading PEM-encoded key data, tolerate CRLF line-endings even + if we are not running on Windows. Previously, non-Windows hosts + would reject these line-endings in certain positions, making + certain key files hard to move from one host to another. Fixes bug + 33032; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (logging): + - Flush stderr, stdout, and file logs during shutdown, if supported + by the OS. This change helps make sure that any final logs are + recorded. Fixes bug 33087; bugfix on 0.4.1.6. + - Stop closing stderr and stdout during shutdown. Closing these file + descriptors can hide sanitiser logs. Fixes bug 33087; bugfix + on 0.4.1.6. + + o Minor bugfixes (onion services v3): + - Relax severity of a log message that can appear naturally when + decoding onion service descriptors as a relay. Also add some + diagnostics to debug any future bugs in that area. Fixes bug + 31669; bugfix on 0.3.0.1-alpha. + - Block a client-side assertion by disallowing the registration of + an x25519 client auth key that's all zeroes. Fixes bug 33545; + bugfix on 0.4.3.1-alpha. Based on patch from "cypherpunks". + + o Code simplification and refactoring: + - Disable our coding standards best practices tracker in our git + hooks. (0.4.3 branches only.) Closes ticket 33678. + + o Testing: + - Avoid conflicts between the fake sockets in tor's unit tests, and + real file descriptors. Resolves issues running unit tests with + GitHub Actions, where the process that embeds or launches the + tests has already opened a large number of file descriptors. Fixes + bug 33782; bugfix on 0.2.8.1-alpha. Found and fixed by + Putta Khunchalee. + + o Testing (CI): + - In our Appveyor Windows CI, copy required DLLs to test and app + directories, before running tor's tests. This ensures that tor.exe + and test*.exe use the correct version of each DLL. This fix is not + required, but we hope it will avoid DLL search issues in future. + Fixes bug 33673; bugfix on 0.3.4.2-alpha. + - On Appveyor, skip the crypto/openssl_version test, which is + failing because of a mismatched library installation. Fix + for 33643. + + +Changes in version 0.4.3.3-alpha - 2020-03-18 + Tor 0.4.3.3-alpha fixes several bugs in previous releases, including + TROVE-2020-002, a major denial-of-service vulnerability that affected + all released Tor instances since 0.2.1.5-alpha. Using this + vulnerability, an attacker could cause Tor instances to consume a huge + amount of CPU, disrupting their operations for several seconds or + minutes. This attack could be launched by anybody against a relay, or + by a directory cache against any client that had connected to it. The + attacker could launch this attack as much as they wanted, thereby + disrupting service or creating patterns that could aid in traffic + analysis. This issue was found by OSS-Fuzz, and is also tracked + as CVE-2020-10592. + + We do not have reason to believe that this attack is currently being + exploited in the wild, but nonetheless we advise everyone to upgrade + as soon as packages are available. + + o Major bugfixes (security, denial-of-service): + - Fix a denial-of-service bug that could be used by anyone to + consume a bunch of CPU on any Tor relay or authority, or by + directories to consume a bunch of CPU on clients or hidden + services. Because of the potential for CPU consumption to + introduce observable timing patterns, we are treating this as a + high-severity security issue. Fixes bug 33119; bugfix on + 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue + as TROVE-2020-002 and CVE-2020-10592. + + o Major bugfixes (circuit padding, memory leak): + - Avoid a remotely triggered memory leak in the case that a circuit + padding machine is somehow negotiated twice on the same circuit. + Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls. + This is also tracked as TROVE-2020-004 and CVE-2020-10593. + + o Major bugfixes (directory authority): + - Directory authorities will now send a 503 (not enough bandwidth) + code to clients when under bandwidth pressure. Known relays and + other authorities will always be answered regardless of the + bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha. + + o Minor features (diagnostic): + - Improve assertions and add some memory-poisoning code to try to + track down possible causes of a rare crash (32564) in the EWMA + code. Closes ticket 33290. + + o Minor features (directory authorities): + - Directory authorities now reject descriptors from relays running + Tor versions from the 0.2.9 and 0.4.0 series. The 0.3.5 series is + still allowed. Resolves ticket 32672. Patch by Neel Chauhan. + + o Minor features (usability): + - Include more information when failing to parse a configuration + value. This should make it easier to tell what's going wrong when + a configuration file doesn't parse. Closes ticket 33460. + + o Minor bugfix (relay, configuration): + - Warn if the ContactInfo field is not set, and tell the relay + operator that not having a ContactInfo field set might cause their + relay to get rejected in the future. Fixes bug 33361; bugfix + on 0.1.1.10-alpha. + + o Minor bugfixes (coding best practices checks): + - Allow the "practracker" script to read unicode files when using + Python 2. We made the script use unicode literals in 0.4.3.1-alpha, + but didn't change the codec for opening files. Fixes bug 33374; + bugfix on 0.4.3.1-alpha. + + o Minor bugfixes (continuous integration): + - Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix + on 0.3.2.2-alpha. + + o Minor bugfixes (onion service v3, client): + - Remove a BUG() warning that would cause a stack trace if an onion + service descriptor was freed while we were waiting for a + rendezvous circuit to complete. Fixes bug 28992; bugfix + on 0.3.2.1-alpha. + + o Minor bugfixes (onion services v3): + - Fix an assertion failure that could result from a corrupted + ADD_ONION control port command. Found by Saibato. Fixes bug 33137; + bugfix on 0.3.3.1-alpha. This issue is also tracked + as TROVE-2020-003. + + o Documentation (manpage): + - Alphabetize the Server and Directory server sections of the tor + manpage. Also split Statistics options into their own section of + the manpage. Closes ticket 33188. Work by Swati Thacker as part of + Google Season of Docs. + - Document the __OwningControllerProcess torrc option and specify + its polling interval. Resolves issue 32971. + + o Testing (Travis CI): + - Remove a redundant distcheck job. Closes ticket 33194. + - Sort the Travis jobs in order of speed: putting the slowest jobs + first takes full advantage of Travis job concurrency. Closes + ticket 33194. + - Stop allowing the Chutney IPv6 Travis job to fail. This job was + previously configured to fast_finish (which requires + allow_failure), to speed up the build. Closes ticket 33195. + - When a Travis chutney job fails, use chutney's new "diagnostics.sh" + tool to produce detailed diagnostic output. Closes ticket 32792. + + +Changes in version 0.4.2.7 - 2020-03-18 + This is the third stable release in the 0.4.2.x series. It backports + numerous fixes from later releases, including a fix for TROVE-2020- + 002, a major denial-of-service vulnerability that affected all + released Tor instances since 0.2.1.5-alpha. Using this vulnerability, + an attacker could cause Tor instances to consume a huge amount of CPU, + disrupting their operations for several seconds or minutes. This + attack could be launched by anybody against a relay, or by a directory + cache against any client that had connected to it. The attacker could + launch this attack as much as they wanted, thereby disrupting service + or creating patterns that could aid in traffic analysis. This issue + was found by OSS-Fuzz, and is also tracked as CVE-2020-10592. + + We do not have reason to believe that this attack is currently being + exploited in the wild, but nonetheless we advise everyone to upgrade + as soon as packages are available. + + o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha): + - Fix a denial-of-service bug that could be used by anyone to + consume a bunch of CPU on any Tor relay or authority, or by + directories to consume a bunch of CPU on clients or hidden + services. Because of the potential for CPU consumption to + introduce observable timing patterns, we are treating this as a + high-severity security issue. Fixes bug 33119; bugfix on + 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue + as TROVE-2020-002 and CVE-2020-10592. + + o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha): + - Avoid a remotely triggered memory leak in the case that a circuit + padding machine is somehow negotiated twice on the same circuit. + Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls. + This is also tracked as TROVE-2020-004 and CVE-2020-10593. + + o Major bugfixes (directory authority, backport from 0.4.3.3-alpha): + - Directory authorities will now send a 503 (not enough bandwidth) + code to clients when under bandwidth pressure. Known relays and + other authorities will always be answered regardless of the + bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha. + + o Minor features (continuous integration, backport from 0.4.3.2-alpha): + - Stop allowing failures on the Travis CI stem tests job. It looks + like all the stem hangs we were seeing before are now fixed. + Closes ticket 33075. + + o Minor bugfixes (bridges, backport from 0.4.3.1-alpha): + - Lowercase the configured value of BridgeDistribution before adding + it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha. + + o Minor bugfixes (logging, backport from 0.4.3.2-alpha): + - If we encounter a bug when flushing a buffer to a TLS connection, + only log the bug once per invocation of the Tor process. + Previously we would log with every occurrence, which could cause + us to run out of disk space. Fixes bug 33093; bugfix + on 0.3.2.2-alpha. + + o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha): + - Fix an assertion failure that could result from a corrupted + ADD_ONION control port command. Found by Saibato. Fixes bug 33137; + bugfix on 0.3.3.1-alpha. This issue is also tracked + as TROVE-2020-003. + + o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha): + - Fix a syntax warning given by newer versions of Rust that was + creating problems for our continuous integration. Fixes bug 33212; + bugfix on 0.3.5.1-alpha. + + o Testing (Travis CI, backport from 0.4.3.3-alpha): + - Remove a redundant distcheck job. Closes ticket 33194. + - Sort the Travis jobs in order of speed: putting the slowest jobs + first takes full advantage of Travis job concurrency. Closes + ticket 33194. + - Stop allowing the Chutney IPv6 Travis job to fail. This job was + previously configured to fast_finish (which requires + allow_failure), to speed up the build. Closes ticket 33195. + - When a Travis chutney job fails, use chutney's new "diagnostics.sh" + tool to produce detailed diagnostic output. Closes ticket 32792. + + +Changes in version 0.4.1.9 - 2020-03-18 + Tor 0.4.1.9 backports important fixes from later Tor releases, + including a fix for TROVE-2020-002, a major denial-of-service + vulnerability that affected all released Tor instances since + 0.2.1.5-alpha. Using this vulnerability, an attacker could cause Tor + instances to consume a huge amount of CPU, disrupting their operations + for several seconds or minutes. This attack could be launched by + anybody against a relay, or by a directory cache against any client + that had connected to it. The attacker could launch this attack as + much as they wanted, thereby disrupting service or creating patterns + that could aid in traffic analysis. This issue was found by OSS-Fuzz, + and is also tracked as CVE-2020-10592. + + We do not have reason to believe that this attack is currently being + exploited in the wild, but nonetheless we advise everyone to upgrade + as soon as packages are available. + + o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha): + - Fix a denial-of-service bug that could be used by anyone to + consume a bunch of CPU on any Tor relay or authority, or by + directories to consume a bunch of CPU on clients or hidden + services. Because of the potential for CPU consumption to + introduce observable timing patterns, we are treating this as a + high-severity security issue. Fixes bug 33119; bugfix on + 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue + as TROVE-2020-002 and CVE-2020-10592. + + o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha): + - Avoid a remotely triggered memory leak in the case that a circuit + padding machine is somehow negotiated twice on the same circuit. + Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls. + This is also tracked as TROVE-2020-004 and CVE-2020-10593. + + o Minor bugfixes (bridges, backport from 0.4.3.1-alpha): + - Lowercase the configured value of BridgeDistribution before adding + it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha. + + o Minor bugfixes (logging, backport from 0.4.3.2-alpha): + - If we encounter a bug when flushing a buffer to a TLS connection, + only log the bug once per invocation of the Tor process. + Previously we would log with every occurrence, which could cause + us to run out of disk space. Fixes bug 33093; bugfix + on 0.3.2.2-alpha. + + o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha): + - Fix an assertion failure that could result from a corrupted + ADD_ONION control port command. Found by Saibato. Fixes bug 33137; + bugfix on 0.3.3.1-alpha. This issue is also tracked + as TROVE-2020-003. + + o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha): + - Fix a syntax warning given by newer versions of Rust that was + creating problems for our continuous integration. Fixes bug 33212; + bugfix on 0.3.5.1-alpha. + + o Testing (Travis CI, backport from 0.4.3.3-alpha): + - Remove a redundant distcheck job. Closes ticket 33194. + - Sort the Travis jobs in order of speed: putting the slowest jobs + first takes full advantage of Travis job concurrency. Closes + ticket 33194. + - Stop allowing the Chutney IPv6 Travis job to fail. This job was + previously configured to fast_finish (which requires + allow_failure), to speed up the build. Closes ticket 33195. + - When a Travis chutney job fails, use chutney's new "diagnostics.sh" + tool to produce detailed diagnostic output. Closes ticket 32792. + + +Changes in version 0.3.5.10 - 2020-03-18 + Tor 0.3.5.10 backports many fixes from later Tor releases, including a + fix for TROVE-2020-002, a major denial-of-service vulnerability that + affected all released Tor instances since 0.2.1.5-alpha. Using this + vulnerability, an attacker could cause Tor instances to consume a huge + amount of CPU, disrupting their operations for several seconds or + minutes. This attack could be launched by anybody against a relay, or + by a directory cache against any client that had connected to it. The + attacker could launch this attack as much as they wanted, thereby + disrupting service or creating patterns that could aid in traffic + analysis. This issue was found by OSS-Fuzz, and is also tracked + as CVE-2020-10592. + + We do not have reason to believe that this attack is currently being + exploited in the wild, but nonetheless we advise everyone to upgrade + as soon as packages are available. + + o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha): + - Fix a denial-of-service bug that could be used by anyone to + consume a bunch of CPU on any Tor relay or authority, or by + directories to consume a bunch of CPU on clients or hidden + services. Because of the potential for CPU consumption to + introduce observable timing patterns, we are treating this as a + high-severity security issue. Fixes bug 33119; bugfix on + 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue + as TROVE-2020-002 and CVE-2020-10592. + + o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha): + - Correct how we use libseccomp. Particularly, stop assuming that + rules are applied in a particular order or that more rules are + processed after the first match. Neither is the case! In + libseccomp <2.4.0 this lead to some rules having no effect. + libseccomp 2.4.0 changed how rules are generated, leading to a + different ordering, which in turn led to a fatal crash during + startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by + Peter Gerber. + + o Minor features (continuous integration, backport from 0.4.3.2-alpha): + - Stop allowing failures on the Travis CI stem tests job. It looks + like all the stem hangs we were seeing before are now fixed. + Closes ticket 33075. + + o Minor bugfixes (bridges, backport from 0.4.3.1-alpha): + - Lowercase the configured value of BridgeDistribution before adding + it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha. + + o Minor bugfixes (crash, backport from 0.4.2.4-rc): + - When running Tor with an option like --verify-config or + --dump-config that does not start the event loop, avoid crashing + if we try to exit early because of an error. Fixes bug 32407; + bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (logging, backport from 0.4.3.2-alpha): + - If we encounter a bug when flushing a buffer to a TLS connection, + only log the bug once per invocation of the Tor process. + Previously we would log with every occurrence, which could cause + us to run out of disk space. Fixes bug 33093; bugfix + on 0.3.2.2-alpha. + + o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha): + - Fix an assertion failure that could result from a corrupted + ADD_ONION control port command. Found by Saibato. Fixes bug 33137; + bugfix on 0.3.3.1-alpha. This issue is also tracked + as TROVE-2020-003. + + o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha): + - Fix a syntax warning given by newer versions of Rust that was + creating problems for our continuous integration. Fixes bug 33212; + bugfix on 0.3.5.1-alpha. + + o Testing (backport from 0.4.3.1-alpha): + - Re-enable the Travis CI macOS Chutney build, but don't let it + prevent the Travis job from finishing. (The Travis macOS jobs are + slow, so we don't want to have it delay the whole CI process.) + Closes ticket 32629. + - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on + Ubuntu Bionic. Turning off the Sandbox is a work-around, until we + fix the sandbox errors in 32722. Closes ticket 32240. + + o Testing (continuous integration, backport from 0.4.3.1-alpha): + - Use zstd in our Travis Linux builds. Closes ticket 32242. + + o Testing (Travis CI, backport from 0.4.3.3-alpha): + - Remove a redundant distcheck job. Closes ticket 33194. + - Sort the Travis jobs in order of speed: putting the slowest jobs + first takes full advantage of Travis job concurrency. Closes + ticket 33194. + - Stop allowing the Chutney IPv6 Travis job to fail. This job was + previously configured to fast_finish (which requires + - When a Travis chutney job fails, use chutney's new "diagnostics.sh" + tool to produce detailed diagnostic output. Closes ticket 32792. + + +Changes in version 0.4.3.2-alpha - 2020-02-10 + This is the second stable alpha release in the Tor 0.4.3.x series. It + fixes several bugs present in the previous alpha release. Anybody + running the previous alpha should upgrade, and look for bugs in this + one instead. + + o Major bugfixes (onion service client, authorization): + - On a NEWNYM signal, purge entries from the ephemeral client + authorization cache. The permanent ones are kept. Fixes bug 33139; + bugfix on 0.4.3.1-alpha. + + o Minor features (best practices tracker): + - Practracker now supports a --regen-overbroad option to regenerate + the exceptions file, but only to revise exceptions to be _less_ + tolerant of best-practices violations. Closes ticket 32372. + + o Minor features (continuous integration): + - Run Doxygen Makefile target on Travis, so we can learn about + regressions in our internal documentation. Closes ticket 32455. + - Stop allowing failures on the Travis CI stem tests job. It looks + like all the stem hangs we were seeing before are now fixed. + Closes ticket 33075. + + o Minor bugfixes (build system): + - Revise configure options that were either missing or incorrect in + the configure summary. Fixes bug 32230; bugfix on 0.4.3.1-alpha. + + o Minor bugfixes (controller protocol): + - Fix a memory leak introduced by refactoring of control reply + formatting code. Fixes bug 33039; bugfix on 0.4.3.1-alpha. + - Fix a memory leak in GETINFO responses. Fixes bug 33103; bugfix + on 0.4.3.1-alpha. + - When receiving "ACTIVE" or "DORMANT" signals on the control port, + report them as SIGNAL events. Previously we would log a bug + warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (logging): + - If we encounter a bug when flushing a buffer to a TLS connection, + only log the bug once per invocation of the Tor process. + Previously we would log with every occurrence, which could cause + us to run out of disk space. Fixes bug 33093; bugfix + on 0.3.2.2-alpha. + - When logging a bug, do not say "Future instances of this warning + will be silenced" unless we are actually going to silence them. + Previously we would say this whenever a BUG() check failed in the + code. Fixes bug 33095; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (onion service v2): + - Move a series of v2 onion service warnings to protocol-warning + level because they can all be triggered remotely by a malformed + request. Fixes bug 32706; bugfix on 0.1.1.14-alpha. + + o Minor bugfixes (onion service v3, client authorization): + - When removing client authorization credentials using the control + port, also remove the associated descriptor, so the onion service + can no longer be contacted. Fixes bug 33148; bugfix + on 0.4.3.1-alpha. + + o Minor bugfixes (pluggable transports): + - When receiving a message on standard error from a pluggable + transport, log it at info level, rather than as a warning. Fixes + bug 33005; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (rust, build): + - Fix a syntax warning given by newer versions of Rust that was + creating problems for our continuous integration. Fixes bug 33212; + bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (TLS bug handling): + - When encountering a bug in buf_read_from_tls(), return a "MISC" + error code rather than "WANTWRITE". This change might help avoid + some CPU-wasting loops if the bug is ever triggered. Bug reported + by opara. Fixes bug 32673; bugfix on 0.3.0.4-alpha. + + o Code simplification and refactoring (mainloop): + - Simplify the ip_address_changed() function by removing redundant + checks. Closes ticket 33091. + + o Documentation (manpage): + - Split "Circuit Timeout" options and "Node Selection" options into + their own sections of the tor manpage. Closes tickets 32928 and + 32929. Work by Swati Thacker as part of Google Season of Docs. + + +Changes in version 0.4.2.6 - 2020-01-30 + This is the second stable release in the 0.4.2.x series. It backports + several bugfixes from 0.4.3.1-alpha, including some that had affected + the Linux seccomp2 sandbox or Windows services. If you're running with + one of those configurations, you'll probably want to upgrade; + otherwise, you should be fine with 0.4.2.5. + + o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha): + - Correct how we use libseccomp. Particularly, stop assuming that + rules are applied in a particular order or that more rules are + processed after the first match. Neither is the case! In + libseccomp <2.4.0 this led to some rules having no effect. + libseccomp 2.4.0 changed how rules are generated, leading to a + different ordering, which in turn led to a fatal crash during + startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by + Peter Gerber. + - Fix crash when reloading logging configuration while the + experimental sandbox is enabled. Fixes bug 32841; bugfix on + 0.4.1.7. Patch by Peter Gerber. + + o Minor bugfixes (correctness checks, backport from 0.4.3.1-alpha): + - Use GCC/Clang's printf-checking feature to make sure that + tor_assertf() arguments are correctly typed. Fixes bug 32765; + bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (logging, crash, backport from 0.4.3.1-alpha): + - Avoid a possible crash when trying to log a (fatal) assertion + failure about mismatched magic numbers in configuration objects. + Fixes bug 32771; bugfix on 0.4.2.1-alpha. + + o Minor bugfixes (testing, backport from 0.4.3.1-alpha): + - When TOR_DISABLE_PRACTRACKER is set, do not apply it to the + test_practracker.sh script. Doing so caused a test failure. Fixes + bug 32705; bugfix on 0.4.2.1-alpha. + - When TOR_DISABLE_PRACTRACKER is set, log a notice to stderr when + skipping practracker checks. Fixes bug 32705; bugfix + on 0.4.2.1-alpha. + + o Minor bugfixes (windows service, backport from 0.4.3.1-alpha): + - Initialize the publish/subscribe system when running as a windows + service. Fixes bug 32778; bugfix on 0.4.1.1-alpha. + + o Testing (backport from 0.4.3.1-alpha): + - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on + Ubuntu Bionic. Turning off the Sandbox is a work-around, until we + fix the sandbox errors in 32722. Closes ticket 32240. + - Re-enable the Travis CI macOS Chutney build, but don't let it + prevent the Travis job from finishing. (The Travis macOS jobs are + slow, so we don't want to have it delay the whole CI process.) + Closes ticket 32629. + + o Testing (continuous integration, backport from 0.4.3.1-alpha): + - Use zstd in our Travis Linux builds. Closes ticket 32242. + + +Changes in version 0.4.1.8 - 2020-01-30 + This release backports several bugfixes from later release series, + including some that had affected the Linux seccomp2 sandbox or Windows + services. If you're running with one of those configurations, you'll + probably want to upgrade; otherwise, you should be fine with your + current version of 0.4.1.x. + + o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha): + - Correct how we use libseccomp. Particularly, stop assuming that + rules are applied in a particular order or that more rules are + processed after the first match. Neither is the case! In + libseccomp <2.4.0 this led to some rules having no effect. + libseccomp 2.4.0 changed how rules are generated, leading to a + different ordering, which in turn led to a fatal crash during + startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by + Peter Gerber. + - Fix crash when reloading logging configuration while the + experimental sandbox is enabled. Fixes bug 32841; bugfix on + 0.4.1.7. Patch by Peter Gerber. + + o Minor bugfixes (crash, backport form 0.4.2.4-rc): + - When running Tor with an option like --verify-config or + --dump-config that does not start the event loop, avoid crashing + if we try to exit early because of an error. Fixes bug 32407; + bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (windows service, backport from 0.4.3.1-alpha): + - Initialize the publish/subscribe system when running as a windows + service. Fixes bug 32778; bugfix on 0.4.1.1-alpha. + + o Testing (backport from 0.4.3.1-alpha): + - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on + Ubuntu Bionic. Turning off the Sandbox is a work-around, until we + fix the sandbox errors in 32722. Closes ticket 32240. + - Re-enable the Travis CI macOS Chutney build, but don't let it + prevent the Travis job from finishing. (The Travis macOS jobs are + slow, so we don't want to have it delay the whole CI process.) + Closes ticket 32629. + + o Testing (continuous integration, backport from 0.4.3.1-alpha): + - Use zstd in our Travis Linux builds. Closes ticket 32242. + + +Changes in version 0.4.3.1-alpha - 2020-01-22 + This is the first alpha release in the 0.4.3.x series. It includes + improved support for application integration of onion services, support + for building in a client-only mode, and newly improved internal + documentation (online at https://src-ref.docs.torproject.org/tor/). It + also has numerous other small bugfixes and features, as well as + improvements to our code's internal organization that should help us + write better code in the future. + + o New system requirements: + - When building Tor, you now need to have Python 3 in order to run + the integration tests. (Python 2 is officially unsupported + upstream, as of 1 Jan 2020.) Closes ticket 32608. + + o Major features (build system): + - The relay code can now be disabled using the --disable-module-relay + configure option. When this option is set, we also disable the + dirauth module. Closes ticket 32123. + - When Tor is compiled --disable-module-relay, we also omit the code + used to act as a directory cache. Closes ticket 32487. + + o Major features (directory authority, ed25519): + - Add support for banning a relay's ed25519 keys in the approved- + routers file. This will help us migrate away from RSA keys in the + future. Previously, only RSA keys could be banned in approved- + routers. Resolves ticket 22029. Patch by Neel Chauhan. + + o Major features (onion service, controller): + - New control port commands to manage client-side onion service + authorization credentials. The ONION_CLIENT_AUTH_ADD command adds + a credential, ONION_CLIENT_AUTH_REMOVE deletes a credential, and + ONION_CLIENT_AUTH_VIEW lists the credentials. Closes ticket 30381. + + o Major features (onion service, SOCKS5): + - Introduce a new SocksPort flag, ExtendedErrors, to support more + detailed error codes in information for applications that support + them. Closes ticket 30382; implements proposal 304. + + o Major features (proxy): + - In addition to its current supported proxy types (HTTP CONNECT, + SOCKS4, and SOCKS5), Tor can now make its OR connections through a + HAProxy server. A new torrc option was added to specify the + address/port of the server: TCPProxy <protocol> <host>:<port>. + Currently the only supported protocol for the option is haproxy. + Closes ticket 31518. Patch done by Suphanat Chunhapanya (haxxpop). + + o Major bugfixes (linux seccomp sandbox): + - Correct how we use libseccomp. Particularly, stop assuming that + rules are applied in a particular order or that more rules are + processed after the first match. Neither is the case! In + libseccomp <2.4.0 this led to some rules having no effect. + libseccomp 2.4.0 changed how rules are generated, leading to a + different ordering, which in turn led to a fatal crash during + startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by + Peter Gerber. + - Fix crash when reloading logging configuration while the + experimental sandbox is enabled. Fixes bug 32841; bugfix on + 0.4.1.7. Patch by Peter Gerber. + + o Major bugfixes (networking): + - Correctly handle IPv6 addresses in SOCKS5 RESOLVE_PTR requests, + and accept strings as well as binary addresses. Fixes bug 32315; + bugfix on 0.3.5.1-alpha. + + o Major bugfixes (onion service): + - Report HS circuit failure back into the HS subsystem so we take + appropriate action with regards to the client introduction point + failure cache. This improves reachability of onion services, since + now clients notice failing introduction circuits properly. Fixes + bug 32020; bugfix on 0.3.2.1-alpha. + + o Minor feature (configure, build system): + - Output a list of enabled/disabled features at the end of the + configure process in a pleasing way. Closes ticket 31373. + + o Minor feature (heartbeat, onion service): + - Add the DoS INTRODUCE2 defenses counter to the heartbeat DoS + message. Closes ticket 31371. + + o Minor features (configuration validation): + - Configuration validation can now be done by per-module callbacks, + rather than a global validation function. This will let us reduce + the size of config.c and some of its more cumbersome functions. + Closes ticket 31241. + + o Minor features (configuration): + - If a configured hardware crypto accelerator in AccelName is + prefixed with "!", Tor now exits when it cannot be found. Closes + ticket 32406. + - We now use flag-driven logic to warn about obsolete configuration + fields, so that we can include their names. In 0.4.2, we used a + special type, which prevented us from generating good warnings. + Implements ticket 32404. + + o Minor features (controller): + - Add stream isolation data to STREAM event. Closes ticket 19859. + - Implement a new GETINFO command to fetch microdescriptor + consensus. Closes ticket 31684. + + o Minor features (debugging, directory system): + - Don't crash when we find a non-guard with a guard-fraction value + set. Instead, log a bug warning, in an attempt to figure out how + this happened. Diagnostic for ticket 32868. + + o Minor features (defense in depth): + - Add additional checks around tor_vasprintf() usage, in case the + function returns an error. Patch by Tobias Stoeckmann. Fixes + ticket 31147. + + o Minor features (developer tooling): + - Remove the 0.2.9.x series branches from git scripts (git-merge- + forward.sh, git-pull-all.sh, git-push-all.sh, git-setup-dirs.sh). + Closes ticket 32772. + + o Minor features (developer tools): + - Add a check_cocci_parse.sh script that checks that new code is + parseable by Coccinelle. Add an exceptions file for unparseable + files, and run the script from travis CI. Closes ticket 31919. + - Call the check_cocci_parse.sh script from a 'check-cocci' Makefile + target. Closes ticket 31919. + - Add a rename_c_identifiers.py tool to rename a bunch of C + identifiers at once, and generate a well-formed commit message + describing the change. This should help with refactoring. Closes + ticket 32237. + - Add some scripts in "scripts/coccinelle" to invoke the Coccinelle + semantic patching tool with the correct flags. These flags are + fairly easy to forget, and these scripts should help us use + Coccinelle more effectively in the future. Closes ticket 31705. + + o Minor features (Doxygen): + - Update Doxygen configuration file to a more recent template (from + 1.8.15). Closes ticket 32110. + - "make doxygen" now works with out-of-tree builds. Closes + ticket 32113. + - Make sure that doxygen outputs documentation for all of our C + files. Previously, some were missing @file declarations, causing + them to be ignored. Closes ticket 32307. + - Our "make doxygen" target now respects --enable-fatal-warnings by + default, and does not warn about items that are missing + documentation. To warn about missing documentation, run configure + with the "--enable-missing-doc-warnings" flag: doing so suspends + fatal warnings for doxygen. Closes ticket 32385. + + o Minor features (git scripts): + - Add TOR_EXTRA_CLONE_ARGS to git-setup-dirs.sh for git clone + customisation. Closes ticket 32347. + - Add git-setup-dirs.sh, which sets up an upstream git repository + and worktrees for tor maintainers. Closes ticket 29603. + - Add TOR_EXTRA_REMOTE_* to git-setup-dirs.sh for a custom extra + remote. Closes ticket 32347. + - Call the check_cocci_parse.sh script from the git commit and push + hooks. Closes ticket 31919. + - Make git-push-all.sh skip unchanged branches when pushing to + upstream. The script already skipped unchanged test branches. + Closes ticket 32216. + - Make git-setup-dirs.sh create a master symlink in the worktree + directory. Closes ticket 32347. + - Skip unmodified source files when doing some existing git hook + checks. Related to ticket 31919. + + o Minor features (IPv6, client): + - Make Tor clients tell dual-stack exits that they prefer IPv6 + connections. This change is equivalent to setting the PreferIPv6 + flag on SOCKSPorts (and most other listener ports). Tor Browser + has been setting this flag for some time, and we want to remove a + client distinguisher at exits. Closes ticket 32637. + + o Minor features (portability, android): + - When building for Android, disable some tests that depend on $HOME + and/or pwdb, which Android doesn't have. Closes ticket 32825. + Patch from Hans-Christoph Steiner. + + o Minor features (relay modularity): + - Split the relay and server pluggable transport config code into + separate files in the relay module. Disable this code when the + relay module is disabled. Closes part of ticket 32213. + - When the relay module is disabled, reject attempts to set the + ORPort, DirPort, DirCache, BridgeRelay, ExtORPort, or + ServerTransport* options, rather than ignoring the values of these + options. Closes part of ticket 32213. + + o Minor features (relay): + - When the relay module is disabled, change the default config so + that DirCache is 0, and ClientOnly is 1. Closes ticket 32410. + + o Minor features (release tools): + - Port our ChangeLog formatting and sorting tools to Python 3. + Closes ticket 32704. + + o Minor features (testing): + - Detect some common failure cases for test_parseconf.sh in + src/test/conf_failures. Closes ticket 32451. + - Allow test_parseconf.sh to test expected log outputs for successful + configs, as well as failed configs. Closes ticket 32451. + - The test_parseconf.sh script now supports result variants for any + combination of the optional libraries lzma, nss, and zstd. Closes + ticket 32397. + + o Minor features (tests, Android): + - When running the unit tests on Android, create temporary files in + a subdirectory of /data/local/tmp. Closes ticket 32172. Based on a + patch from Hans-Christoph Steiner. + + o Minor bugfixes (bridges): + - Lowercase the configured value of BridgeDistribution before adding + it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha. + + o Minor bugfixes (build system): + - Fix "make autostyle" for out-of-tree builds. Fixes bug 32370; + bugfix on 0.4.1.2-alpha. + + o Minor bugfixes (configuration handling): + - Make control_event_conf_changed() take in a config_line_t instead + of a smartlist of alternating key/value entries. Fixes bug 31531; + bugfix on 0.2.3.3-alpha. Patch by Neel Chauhan. + + o Minor bugfixes (configuration): + - Check for multiplication overflow when parsing memory units inside + configuration. Fixes bug 30920; bugfix on 0.0.9rc1. + - When dumping the configuration, stop adding a trailing space after + the option name when there is no option value. This issue only + affects options that accept an empty value or list. (Most options + reject empty values, or delete the entire line from the dumped + options.) Fixes bug 32352; bugfix on 0.0.9pre6. + - Avoid changing the user's value of HardwareAccel as stored by + SAVECONF, when AccelName is set but HardwareAccel is not. Fixes + bug 32382; bugfix on 0.2.2.1-alpha. + - When creating a KeyDirectory with the same location as the + DataDirectory (not recommended), respect the DataDirectory's + group-readable setting if one has not been set for the + KeyDirectory. Fixes bug 27992; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (controller): + - In routerstatus_has_changed(), check all the fields that are + output over the control port. Fixes bug 20218; bugfix + on 0.1.1.11-alpha + + o Minor bugfixes (correctness checks): + - Use GCC/Clang's printf-checking feature to make sure that + tor_assertf() arguments are correctly typed. Fixes bug 32765; + bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (developer tools): + - Allow paths starting with ./ in scripts/add_c_file.py. Fixes bug + 31336; bugfix on 0.4.1.2-alpha. + + o Minor bugfixes (dirauth module): + - Split the dirauth config code into a separate file in the dirauth + module. Disable this code when the dirauth module is disabled. + Closes ticket 32213. + - When the dirauth module is disabled, reject attempts to set the + AuthoritativeDir option, rather than ignoring the value of the + option. Fixes bug 32213; bugfix on 0.3.4.1-alpha. + + o Minor bugfixes (embedded Tor): + - When starting Tor any time after the first time in a process, + register the thread in which it is running as the main thread. + Previously, we only did this on Windows, which could lead to bugs + like 23081 on non-Windows platforms. Fixes bug 32884; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (git scripts): + - Avoid sleeping before the last push in git-push-all.sh. Closes + ticket 32216. + - Forward all unrecognised arguments in git-push-all.sh to git push. + Closes ticket 32216. + + o Minor bugfixes (hidden service v3): + - Do not rely on a "circuit established" flag for intro circuits but + instead always query the HS circuit map. This is to avoid sync + issue with that flag and the map. Fixes bug 32094; bugfix + on 0.3.2.1-alpha. + + o Minor bugfixes (logging, crash): + - Avoid a possible crash when trying to log a (fatal) assertion + failure about mismatched magic numbers in configuration objects. + Fixes bug 32771; bugfix on 0.4.2.1-alpha. + + o Minor bugfixes (onion service v2): + - When sending the INTRO cell for a v2 Onion Service, look at the + failure cache alongside timeout values to check if the intro point + is marked as failed. Previously, we only looked at the relay + timeout values. Fixes bug 25568; bugfix on 0.2.7.3-rc. Patch by + Neel Chauhan. + + o Minor bugfixes (onion services v3, client): + - Properly handle the client rendezvous circuit timeout. Previously + Tor would sometimes timeout a rendezvous circuit awaiting the + introduction ACK, and find itself unable to re-establish all + circuits because the rendezvous circuit timed out too early. Fixes + bug 32021; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (onion services): + - In cancel_descriptor_fetches(), use + connection_list_by_type_purpose() instead of + connection_list_by_type_state(). Fixes bug 32639; bugfix on + 0.3.2.1-alpha. Patch by Neel Chauhan. + + o Minor bugfixes (scripts): + - Fix update_versions.py for out-of-tree builds. Fixes bug 32371; + bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (test): + - Use the same code to find the tor binary in all of our test + scripts. This change makes sure we are always using the coverage + binary when coverage is enabled. Fixes bug 32368; bugfix + on 0.2.7.3-rc. + + o Minor bugfixes (testing): + - Stop ignoring "tor --dump-config" errors in test_parseconf.sh. + Fixes bug 32468; bugfix on 0.4.2.1-alpha. + - When TOR_DISABLE_PRACTRACKER is set, do not apply it to the + test_practracker.sh script. Doing so caused a test failure. Fixes + bug 32705; bugfix on 0.4.2.1-alpha. + - When TOR_DISABLE_PRACTRACKER is set, log a notice to stderr when + skipping practracker checks. Fixes bug 32705; bugfix + on 0.4.2.1-alpha. + + o Minor bugfixes (tests): + - Our option-validation tests no longer depend on specially + configured non-default, non-passing sets of options. Previously, + the tests had been written to assume that options would _not_ be + set to their defaults, which led to needless complexity and + verbosity. Fixes bug 32175; bugfix on 0.2.8.1-alpha. + + o Minor bugfixes (windows service): + - Initialize the publish/subscribe system when running as a windows + service. Fixes bug 32778; bugfix on 0.4.1.1-alpha. + + o Deprecated features: + - Deprecate the ClientAutoIPv6ORPort option. This option was not + true "Happy Eyeballs", and often failed on connections that + weren't reliably dual-stack. Closes ticket 32942. Patch by + Neel Chauhan. + + o Documentation: + - Provide a quickstart guide for a Circuit Padding Framework, and + documentation for researchers to implement and study circuit + padding machines. Closes ticket 28804. + - Add documentation in 'HelpfulTools.md' to describe how to build a + tag file. Closes ticket 32779. + - Create a high-level description of the long-term software + architecture goals. Closes ticket 32206. + - Describe the --dump-config command in the manual page. Closes + ticket 32467. + - Unite coding advice from this_not_that.md in torguts repo into our + coding standards document. Resolves ticket 31853. + + o Removed features: + - Our Doxygen configuration no longer generates LaTeX output. The + reference manual produced by doing this was over 4000 pages long, + and generally unusable. Closes ticket 32099. + - The option "TestingEstimatedDescriptorPropagationTime" is now + marked as obsolete. It has had no effect since 0.3.0.7, when + clients stopped rejecting consensuses "from the future". Closes + ticket 32807. + - We no longer support consensus methods before method 28; these + methods were only used by authorities running versions of Tor that + are now at end-of-life. In effect, this means that clients, + relays, and authorities now assume that authorities will be + running version 0.3.5.x or later. Closes ticket 32695. + + o Testing: + - Add more test cases for tor's UTF-8 validation function. Also, + check the arguments passed to the function for consistency. Closes + ticket 32845. + - Improve test coverage for relay and dirauth config code, focusing + on option validation and normalization. Closes ticket 32213. + - Improve the consistency of test_parseconf.sh output, and run all + the tests, even if one fails. Closes ticket 32213. + - Re-enable the Travis CI macOS Chutney build, but don't let it + prevent the Travis job from finishing. (The Travis macOS jobs are + slow, so we don't want to have it delay the whole CI process.) + Closes ticket 32629. + - Run the practracker unit tests in the pre-commit git hook. Closes + ticket 32609. + - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on + Ubuntu Bionic. Turning off the Sandbox is a work-around, until we + fix the sandbox errors in 32722. Closes ticket 32240. + + o Code simplification and refactoring (channel): + - Channel layer had a variable length cell handler that was not used + and thus removed. Closes ticket 32892. + + o Code simplification and refactoring (configuration): + - Immutability is now implemented as a flag on individual + configuration options rather than as part of the option-transition + checking code. Closes ticket 32344. + - Instead of keeping a list of configuration options to check for + relative paths, check all the options whose type is "FILENAME". + Solves part of ticket 32339. + - Our default log (which ordinarily sends NOTICE-level messages to + standard output) is now handled in a more logical manner. + Previously, we replaced the configured log options if they were + empty. Now, we interpret an empty set of log options as meaning + "use the default log". Closes ticket 31999. + - Remove some unused arguments from the options_validate() function, + to simplify our code and tests. Closes ticket 32187. + - Simplify the options_validate() code so that it looks at the + default options directly, rather than taking default options as an + argument. This change lets us simplify its interface. Closes + ticket 32185. + - Use our new configuration architecture to move most authority- + related options to the directory authority module. Closes + ticket 32806. + - When parsing the command line, handle options that determine our + "quiet level" and our mode of operation (e.g., --dump-config and + so on) all in one table. Closes ticket 32003. + + o Code simplification and refactoring (controller): + - Create a new abstraction for formatting control protocol reply + lines based on key-value pairs. Refactor some existing control + protocol code to take advantage of this. Closes ticket 30984. + - Create a helper function that can fetch network status or + microdesc consensuses. Closes ticket 31684. + + o Code simplification and refactoring (dirauth modularization): + - Remove the last remaining HAVE_MODULE_DIRAUTH inside a function. + Closes ticket 32163. + - Replace some confusing identifiers in process_descs.c. Closes + ticket 29826. + - Simplify some relay and dirauth config code. Closes ticket 32213. + + o Code simplification and refactoring (misc): + - Make all the structs we declare follow the same naming convention + of ending with "_t". Closes ticket 32415. + - Move and rename some configuration-related code for clarity. + Closes ticket 32304. + - Our include.am files are now broken up by subdirectory. + Previously, src/core/include.am covered all of the subdirectories + in "core", "feature", and "app". Closes ticket 32137. + - Remove underused NS*() macros from test code: they make our tests + more confusing, especially for code-formatting tools. Closes + ticket 32887. + + o Code simplification and refactoring (relay modularization): + - Disable relay_periodic when the relay module is disabled. Closes + ticket 32244. + - Disable relay_sys when the relay module is disabled. Closes + ticket 32245. + + o Code simplification and refactoring (tool support): + - Add numerous missing dependencies to our include files, so that + they can be included in different reasonable orders and still + compile. Addresses part of ticket 32764. + - Fix some parts of our code that were difficult for Coccinelle to + parse. Related to ticket 31705. + - Fix some small issues in our code that prevented automatic + formatting tools from working. Addresses part of ticket 32764. + + o Documentation (manpage): + - Alphabetize the Client Options section of the tor manpage. Closes + ticket 32846. + - Alphabetize the General Options section of the tor manpage. Closes + ticket 32708. + - In the tor(1) manpage, reword and improve formatting of the + COMMAND-LINE OPTIONS and DESCRIPTION sections. Closes ticket + 32277. Based on work by Swati Thacker as part of Google Season + of Docs. + - In the tor(1) manpage, reword and improve formatting of the FILES, + SEE ALSO, and BUGS sections. Closes ticket 32176. Based on work by + Swati Thacker as part of Google Season of Docs. + + o Testing (circuit, EWMA): + - Add unit tests for circuitmux and EWMA subsystems. Closes + ticket 32196. + + o Testing (continuous integration): + - Use zstd in our Travis Linux builds. Closes ticket 32242. + + +Changes in version 0.4.2.5 - 2019-12-09 + This is the first stable release in the 0.4.2.x series. This series + improves reliability and stability, and includes several stability and + correctness improvements for onion services. It also fixes many smaller + bugs present in previous series. + + Per our support policy, we will support the 0.4.2.x series for nine + months, or until three months after the release of a stable 0.4.3.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. + + Per our support policy, we will support the 0.4.2.x series for nine + months, or until three months after the release of a stable 0.4.3.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 0.4.1.4-rc. For a complete list of changes + since 0.4.1.5, see the ReleaseNotes file. + + o Minor features (geoip): + - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2 + Country database. Closes ticket 32685. + + o Testing: + - Require C99 standards-conforming code in Travis CI, but allow GNU + gcc extensions. Also activates clang's -Wtypedef-redefinition + warnings. Build some jobs with -std=gnu99, and some jobs without. + Closes ticket 32500. + + +Changes in version 0.4.1.7 - 2019-12-09 + This release backports several bugfixes to improve stability and + correctness. Anyone experiencing build problems or crashes with 0.4.1.6, + including all relays relying on AccountingMax, should upgrade. + + o Major features (directory authorities, backport from 0.4.2.2-alpha): + - Directory authorities now reject relays running all currently + deprecated release series. The currently supported release series + are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549. + + o Major bugfixes (embedded Tor, backport from 0.4.2.2-alpha): + - Avoid a possible crash when restarting Tor in embedded mode and + enabling a different set of publish/subscribe messages. Fixes bug + 31898; bugfix on 0.4.1.1-alpha. + + o Major bugfixes (relay, backport from 0.4.2.3-alpha): + - Relays now respect their AccountingMax bandwidth again. When + relays entered "soft" hibernation (which typically starts when + we've hit 90% of our AccountingMax), we had stopped checking + whether we should enter hard hibernation. Soft hibernation refuses + new connections and new circuits, but the existing circuits can + continue, meaning that relays could have exceeded their configured + AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha. + + o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha): + - Stop ignoring torrc options after an %include directive, when the + included directory ends with a file that does not contain any + config options (but does contain comments or whitespace). Fixes + bug 31408; bugfix on 0.3.1.1-alpha. + + o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha): + - Onion services now always use the exact number of intro points + configured with the HiddenServiceNumIntroductionPoints option (or + fewer if nodes are excluded). Before, a service could sometimes + pick more intro points than configured. Fixes bug 31548; bugfix + on 0.3.2.1-alpha. + + o Minor features (continuous integration, backport from 0.4.2.2-alpha): + - When building on Appveyor and Travis, pass the "-k" flag to make, + so that we are informed of all compilation failures, not just the + first one or two. Closes ticket 31372. + + o Minor features (geoip, backport from 0.4.2.5): + - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2 + Country database. Closes ticket 32685. + + o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha): + - Avoid spurious errors when Appveyor CI fails before the install step. + Fixes bug 31884; bugfix on 0.3.4.2-alpha. + + o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc): + - Fix a BUG() assertion that occurs within a very small race window + between when a client intro circuit opens and when its descriptor + gets cleaned up from the cache. The circuit is now closed early, + which will trigger a re-fetch of the descriptor and continue the + connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (connections, backport from 0.4.2.3-rc): + - Avoid trying to read data from closed connections, which can cause + needless loops in Libevent and infinite loops in Shadow. Fixes bug + 30344; bugfix on 0.1.1.1-alpha. + + o Minor bugfixes (error handling, backport from 0.4.2.1-alpha): + - On abort, try harder to flush the output buffers of log messages. + On some platforms (macOS), log messages could be discarded when + the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha. + - Report the tor version whenever an assertion fails. Previously, we + only reported the Tor version on some crashes, and some non-fatal + assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha. + - When tor aborts due to an error, close log file descriptors before + aborting. Closing the logs makes some OSes flush log file buffers, + rather than deleting buffered log lines. Fixes bug 31594; bugfix + on 0.2.5.2-alpha. + + o Minor bugfixes (logging, backport from 0.4.2.2-alpha): + - Add a missing check for HAVE_PTHREAD_H, because the backtrace code + uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha. + - Disable backtrace signal handlers when shutting down tor. Fixes + bug 31614; bugfix on 0.2.5.2-alpha. + - Rate-limit our the logging message about the obsolete .exit + notation. Previously, there was no limit on this warning, which + could potentially be triggered many times by a hostile website. + Fixes bug 31466; bugfix on 0.2.2.1-alpha. + + o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha): + - Do not log a nonfatal assertion failure when receiving a VERSIONS + cell on a connection using the obsolete v1 link protocol. Log a + protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha): + - Reset the periodic events' "enabled" flag when Tor is shut down + cleanly. Previously, this flag was left on, which caused periodic + events not to be re-enabled when Tor was relaunched in-process + with tor_api.h after a shutdown. Fixes bug 32058; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (multithreading, backport from 0.4.2.2-alpha): + - Avoid some undefined behaviour when freeing mutexes. Fixes bug + 31736; bugfix on 0.0.7. + + o Minor bugfixes (process management, backport from 0.4.2.3-alpha): + - Remove overly strict assertions that triggered when a pluggable + transport failed to launch. Fixes bug 31091; bugfix + on 0.4.0.1-alpha. + - Remove an assertion in the Unix process backend. This assertion + would trigger when we failed to find the executable for a child + process. Fixes bug 31810; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (relay, backport from 0.4.2.2-alpha): + - Avoid crashing when starting with a corrupt keys directory where + the old ntor key and the new ntor key are identical. Fixes bug + 30916; bugfix on 0.2.4.8-alpha. + + o Minor bugfixes (testing, backport from 0.4.2.3-alpha): + - When testing port rebinding, don't busy-wait for tor to log. + Instead, actually sleep for a short time before polling again. + Also improve the formatting of control commands and log messages. + Fixes bug 31837; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (tests, SunOS, backport from 0.4.2.2-alpha): + - Avoid a map_anon_nofork test failure due to a signed/unsigned + integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha): + - Log bugs about the TLS read buffer's length only once, rather than + filling the logs with similar warnings. Fixes bug 31939; bugfix + on 0.3.0.4-rc. + + o Documentation (backport from 0.4.2.2-alpha): + - Explain why we can't destroy the backtrace buffer mutex. Explain + why we don't need to destroy the log mutex. Closes ticket 31736. + + o Testing (continuous integration, backport from 0.4.2.3-alpha): + - Disable all but one Travis CI macOS build, to mitigate slow + scheduling of Travis macOS jobs. Closes ticket 32177. + - Run the chutney IPv6 networks as part of Travis CI. Closes + ticket 30860. + - Simplify the Travis CI build matrix, and optimise for build time. + Closes ticket 31859. + - Use Windows Server 2019 instead of Windows Server 2016 in our + Appveyor builds. Closes ticket 32086. + + o Testing (continuous integration, backport from 0.4.2.4-rc): + - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241. + - Use Ubuntu Bionic images for our Travis CI builds, so we can get a + recent version of coccinelle. But leave chutney on Ubuntu Trusty, + until we can fix some Bionic permissions issues (see ticket + 32240). Related to ticket 31919. + - Install the mingw OpenSSL package in Appveyor. This makes sure + that the OpenSSL headers and libraries match in Tor's Appveyor + builds. (This bug was triggered by an Appveyor image update.) + Fixes bug 32449; bugfix on 0.3.5.6-rc. + + o Testing (continuous integration, backport from 0.4.2.5): + - Require C99 standards-conforming code in Travis CI, but allow GNU gcc + extensions. Also activates clang's -Wtypedef-redefinition warnings. + Build some jobs with -std=gnu99, and some jobs without. + Closes ticket 32500. + + +Changes in version 0.4.0.6 - 2019-12-09 + This is the second stable release in the 0.4.0.x series. This release + backports several bugfixes to improve stability and correctness. Anyone + experiencing build problems or crashes with 0.4.0.5, including all relays + relying on AccountingMax, should upgrade. + + Note that, per our support policy, support for the 0.4.0.x series will end + on 2 Feb 2020. Anyone still running 0.4.0.x should plan to upgrade to the + latest stable release, or downgrade to 0.3.5.x, which will get long-term + support until 1 Feb 2022. + + o Directory authority changes (backport from 0.4.1.5): + - The directory authority "dizum" has a new IP address. Closes + ticket 31406. + + o Major bugfixes (bridges, backport from 0.4.1.2-alpha): + - 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 (circuit build, guard, backport from 0.4.1.4-rc): + - When considering upgrading circuits from "waiting for guard" to + "open", always ignore circuits that are marked for close. Otherwise, + we can end up in the situation where a subsystem is notified that + a closing circuit has just opened, leading to undesirable + behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha. + + o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha): + - Properly clean up the introduction point map when circuits change + purpose from onion service circuits to pathbias, measurement, or + other circuit types. This should fix some service-side instances + of introduction point failure. Fixes bug 29034; bugfix + on 0.3.2.1-alpha. + + o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha): + - 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 Major bugfixes (relay, backport from 0.4.2.3-alpha): + - Relays now respect their AccountingMax bandwidth again. When + relays entered "soft" hibernation (which typically starts when + we've hit 90% of our AccountingMax), we had stopped checking + whether we should enter hard hibernation. Soft hibernation refuses + new connections and new circuits, but the existing circuits can + continue, meaning that relays could have exceeded their configured + AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha. + + o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha): + - Stop ignoring torrc options after an %include directive, when the + included directory ends with a file that does not contain any + config options (but does contain comments or whitespace). Fixes + bug 31408; bugfix on 0.3.1.1-alpha. + + o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha): + - Onion services now always use the exact number of intro points + configured with the HiddenServiceNumIntroductionPoints option (or + fewer if nodes are excluded). Before, a service could sometimes + pick more intro points than configured. Fixes bug 31548; bugfix + on 0.3.2.1-alpha. + + o Minor features (compile-time modules, backport from version 0.4.1.1-alpha): + - Add a "--list-modules" command to print a list of which compile- + time modules are enabled. Closes ticket 30452. + + o Minor features (continuous integration, backport from 0.4.1.1-alpha): + - Remove sudo configuration lines from .travis.yml as they are no + longer needed with current Travis build environment. Resolves + issue 30213. + + o Minor features (continuous integration, backport from 0.4.1.4-rc): + - Our Travis configuration now uses Chutney to run some network + integration tests automatically. Closes ticket 29280. + + o Minor features (continuous integration, backport from 0.4.2.2-alpha): + - When building on Appveyor and Travis, pass the "-k" flag to make, + so that we are informed of all compilation failures, not just the + first one or two. Closes ticket 31372. + + o Minor features (fallback directory list, backport from 0.4.1.4-rc): + - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc + in December 2018 (of which ~122 were still functional), with a + list of 148 fallbacks (70 new, 78 existing, 79 removed) generated + in June 2019. Closes ticket 28795. + + o Minor features (geoip, backport from 0.4.2.5): + - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2 + Country database. Closes ticket 32685. + + o Minor features (stem tests, backport from 0.4.2.1-alpha): + - Change "make test-stem" so it only runs the stem tests that use + tor. This change makes test-stem faster and more reliable. Closes + ticket 31554. + + o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha): + - Avoid spurious errors when Appveyor CI fails before the install step. + Fixes bug 31884; bugfix on 0.3.4.2-alpha. + + o Minor bugfixes (build system, backport form 0.4.2.1-alpha): + - Do not include the deprecated <sys/sysctl.h> on Linux or Windows + systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha. + + o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha): + - Fix a logic error that prevented the SessionGroup sub-option from + being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha. + + o Minor bugfixes (circuit padding, backport from 0.4.1.4-rc): + - On relays, properly check that a padding machine is absent before + logging a warning about it being absent. Fixes bug 30649; bugfix + on 0.4.0.1-alpha. + + o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc): + - Fix a BUG() assertion that occurs within a very small race window + between when a client intro circuit opens and when its descriptor + gets cleaned up from the cache. The circuit is now closed early, + which will trigger a re-fetch of the descriptor and continue the + connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (clock skew detection, backport from 0.4.1.5): + - Don't believe clock skew results from NETINFO cells that appear to + arrive before we sent the VERSIONS cells they are responding to. + Previously, we would accept them up to 3 minutes "in the past". + Fixes bug 31343; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (compilation warning, backport from 0.4.1.5): + - Fix a compilation warning on Windows about casting a function + pointer for GetTickCount64(). Fixes bug 31374; bugfix + on 0.2.9.1-alpha. + + o Minor bugfixes (compilation, backport from 0.4.1.5): + - Avoid using labs() on time_t, which can cause compilation warnings + on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (compilation, backport from 0.4.2.1-alpha): + - Suppress spurious float-conversion warnings from GCC when calling + floating-point classifier functions on FreeBSD. Fixes part of bug + 31687; bugfix on 0.3.1.5-alpha. + + o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha): + - 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 (configuration, proxies, backport from 0.4.1.2-alpha): + - 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 (connections, backport from 0.4.2.3-rc): + - Avoid trying to read data from closed connections, which can cause + needless loops in Libevent and infinite loops in Shadow. Fixes bug + 30344; bugfix on 0.1.1.1-alpha. + + o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha): + - Allow the test-stem job to fail in Travis, because it sometimes + hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha. + - Skip test_rebind on macOS in Travis, because it is unreliable on + macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha. + - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment + variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc): + - Avoid a set of possible code paths that could try to use freed + memory in routerlist_free() while Tor was exiting. Fixes bug + 31003; bugfix on 0.1.2.2-alpha. + + o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha): + - Stop crashing after parsing an unknown descriptor purpose + annotation. We think this bug can only be triggered by modifying a + local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha. + + o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha): + - 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 (error handling, backport from 0.4.2.1-alpha): + - On abort, try harder to flush the output buffers of log messages. + On some platforms (macOS), log messages could be discarded when + the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha. + - Report the tor version whenever an assertion fails. Previously, we + only reported the Tor version on some crashes, and some non-fatal + assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha): + - When extracting an IPv6 address from a PF-based proxy, verify that + we are actually configured to receive an IPv6 address, and log an + internal error if not. Fixes part of bug 31687; bugfix + on 0.2.3.4-alpha. + + o Minor bugfixes (guards, backport from 0.4.2.1-alpha): + - When tor is missing descriptors for some primary entry guards, + make the log message less alarming. It's normal for descriptors to + expire, as long as tor fetches new ones soon after. Fixes bug + 31657; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (logging, backport from 0.4.1.1-alpha): + - 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. + + o Minor bugfixes (logging, backport from 0.4.2.1-alpha): + - Change log level of message "Hash of session info was not as + expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix + on 0.1.1.10-alpha. + + o Minor bugfixes (logging, backport from 0.4.2.2-alpha): + - Rate-limit our the logging message about the obsolete .exit + notation. Previously, there was no limit on this warning, which + could potentially be triggered many times by a hostile website. + Fixes bug 31466; bugfix on 0.2.2.1-alpha. + + o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha): + - Do not log a nonfatal assertion failure when receiving a VERSIONS + cell on a connection using the obsolete v1 link protocol. Log a + protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha): + - Reset the periodic events' "enabled" flag when Tor is shut down + cleanly. Previously, this flag was left on, which caused periodic + events not to be re-enabled when Tor was relaunched in-process + with tor_api.h after a shutdown. Fixes bug 32058; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha): + - 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 (memory leak, backport from 0.4.1.4-rc): + - Fix a trivial memory leak when parsing an invalid value + from a download schedule in the configuration. Fixes bug + 30894; bugfix on 0.3.4.1-alpha. + + o Minor bugfixes (NetBSD, backport from 0.4.1.2-alpha): + - 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 (onion services, backport from 0.4.1.1-alpha): + - 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. + + o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha): + - 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, backport from 0.4.1.2-alpha): + - 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 (process management, backport from 0.4.2.3-alpha): + - Remove overly strict assertions that triggered when a pluggable + transport failed to launch. Fixes bug 31091; bugfix + on 0.4.0.1-alpha. + - Remove an assertion in the Unix process backend. This assertion + would trigger when we failed to find the executable for a child + process. Fixes bug 31810; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (relay, backport from 0.4.2.2-alpha): + - Avoid crashing when starting with a corrupt keys directory where + the old ntor key and the new ntor key are identical. Fixes bug + 30916; bugfix on 0.2.4.8-alpha. + + o Minor bugfixes (rust, backport from 0.4.2.1-alpha): + - Correctly exclude a redundant rust build job in Travis. Fixes bug + 31463; bugfix on 0.3.5.4-alpha. + + o Minor bugfixes (testing, backport from 0.4.2.3-alpha): + - When testing port rebinding, don't busy-wait for tor to log. + Instead, actually sleep for a short time before polling again. + Also improve the formatting of control commands and log messages. + Fixes bug 31837; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha): + - Log bugs about the TLS read buffer's length only once, rather than + filling the logs with similar warnings. Fixes bug 31939; bugfix + on 0.3.0.4-rc. + + o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha): + - Always retry v2 single onion service intro and rend circuits with + a 3-hop path. Previously, v2 single onion services used a 3-hop + path when rendezvous circuits were retried after a remote or + delayed failure, but a 1-hop path for immediate retries. Fixes bug + 23818; bugfix on 0.2.9.3-alpha. + - Make v3 single onion services fall back to a 3-hop intro, when all + intro points are unreachable via a 1-hop path. Previously, v3 + single onion services failed when all intro nodes were unreachable + via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha. + + o Documentation (backport from 0.4.2.1-alpha): + - Use RFC 2397 data URL scheme to embed an image into tor-exit- + notice.html so that operators no longer have to host it + themselves. Closes ticket 31089. + + o Testing (backport from 0.4.1.2-alpha): + - Specify torrc paths (with empty files) when launching tor in + integration tests; refrain from reading user and system torrcs. + Resolves issue 29702. + + o Testing (continuous integration, backport from 0.4.1.1-alpha): + - In Travis, show stem's tor log after failure. Closes ticket 30234. + + o Testing (continuous integration, backport from 0.4.1.5): + - In Travis, make stem log a controller trace to the console, and + tail stem's tor log after failure. Closes ticket 30591. + - In Travis, only run the stem tests that use a tor binary. Closes + ticket 30694. + + o Testing (continuous integration, backport from 0.4.2.3-alpha): + - Disable all but one Travis CI macOS build, to mitigate slow + scheduling of Travis macOS jobs. Closes ticket 32177. + - Run the chutney IPv6 networks as part of Travis CI. Closes + ticket 30860. + - Simplify the Travis CI build matrix, and optimise for build time. + Closes ticket 31859. + - Use Windows Server 2019 instead of Windows Server 2016 in our + Appveyor builds. Closes ticket 32086. + + o Testing (continuous integration, backport from 0.4.2.4-rc): + - Use Ubuntu Bionic images for our Travis CI builds, so we can get a + recent version of coccinelle. But leave chutney on Ubuntu Trusty, + until we can fix some Bionic permissions issues (see ticket + 32240). Related to ticket 31919. + - Install the mingw OpenSSL package in Appveyor. This makes sure + that the OpenSSL headers and libraries match in Tor's Appveyor + builds. (This bug was triggered by an Appveyor image update.) + Fixes bug 32449; bugfix on 0.3.5.6-rc. + - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241. + + o Testing (continuous integration, backport from 0.4.2.5): + - Require C99 standards-conforming code in Travis CI, but allow GNU gcc + extensions. Also activates clang's -Wtypedef-redefinition warnings. + Build some jobs with -std=gnu99, and some jobs without. + Closes ticket 32500. + +Changes in version 0.3.5.9 - 2019-12-09 + Tor 0.3.5.9 backports serveral fixes from later releases, including + several that affect bridge users, relay stability, onion services, + and much more. + + o Directory authority changes (backport from 0.4.1.5): + - The directory authority "dizum" has a new IP address. Closes + ticket 31406. + + o Major bugfixes (bridges, backport from 0.4.1.2-alpha): + - 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 (circuit build, guard, backport from 0.4.1.4-rc): + - When considering upgrading circuits from "waiting for guard" to + "open", always ignore circuits that are marked for close. Otherwise, + we can end up in the situation where a subsystem is notified that + a closing circuit has just opened, leading to undesirable + behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha. + + o Major bugfixes (NSS, relay, backport from 0.4.0.4-rc): + - 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 Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha): + - Properly clean up the introduction point map when circuits change + purpose from onion service circuits to pathbias, measurement, or + other circuit types. This should fix some service-side instances + of introduction point failure. Fixes bug 29034; bugfix + on 0.3.2.1-alpha. + + o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha): + - 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 Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha): + - Stop ignoring torrc options after an %include directive, when the + included directory ends with a file that does not contain any + config options (but does contain comments or whitespace). Fixes + bug 31408; bugfix on 0.3.1.1-alpha. + + o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha): + - Onion services now always use the exact number of intro points + configured with the HiddenServiceNumIntroductionPoints option (or + fewer if nodes are excluded). Before, a service could sometimes + pick more intro points than configured. Fixes bug 31548; bugfix + on 0.3.2.1-alpha. + + o Minor features (address selection, backport from 0.4.0.3-alpha): + - 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 (bandwidth authority, backport from 0.4.0.4-rc): + - 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. + + o Minor features (compile-time modules, backport from version 0.4.1.1-alpha): + - Add a "--list-modules" command to print a list of which compile- + time modules are enabled. Closes ticket 30452. + + o Minor features (continuous integration, backport from 0.4.0.4-rc): + - On Travis Rust builds, cleanup Rust registry and refrain from + caching the "target/" directory to speed up builds. Resolves + issue 29962. + + o Minor features (continuous integration, backport from 0.4.0.5): + - 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 (continuous integration, backport from 0.4.1.1-alpha): + - Remove sudo configuration lines from .travis.yml as they are no + longer needed with current Travis build environment. Resolves + issue 30213. + + o Minor features (continuous integration, backport from 0.4.1.4-rc): + - Our Travis configuration now uses Chutney to run some network + integration tests automatically. Closes ticket 29280. + + o Minor features (continuous integration, backport from 0.4.2.2-alpha): + - When building on Appveyor and Travis, pass the "-k" flag to make, + so that we are informed of all compilation failures, not just the + first one or two. Closes ticket 31372. + + o Minor features (fallback directory list, backport from 0.4.1.4-rc): + - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc + in December 2018 (of which ~122 were still functional), with a + list of 148 fallbacks (70 new, 78 existing, 79 removed) generated + in June 2019. Closes ticket 28795. + + o Minor features (geoip, backport from 0.4.2.5): + - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2 + Country database. Closes ticket 32685. + + o Minor features (NSS, diagnostic, backport from 0.4.0.4-rc): + - 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 features (stem tests, backport from 0.4.2.1-alpha): + - Change "make test-stem" so it only runs the stem tests that use + tor. This change makes test-stem faster and more reliable. Closes + ticket 31554. + + o Minor bugfixes (security, backport from 0.4.0.4-rc): + - 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. + - 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. + + o Minor bugfix (continuous integration, backport from 0.4.0.4-rc): + - 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 (Appveyor CI, backport from 0.4.2.2-alpha): + - Avoid spurious errors when Appveyor CI fails before the install step. + Fixes bug 31884; bugfix on 0.3.4.2-alpha. + + o Minor bugfixes (build system, backport form 0.4.2.1-alpha): + - Do not include the deprecated <sys/sysctl.h> on Linux or Windows + systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha. + + o Minor bugfixes (C correctness, backport from 0.4.0.4-rc): + - 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 (circuit isolation, backport from 0.4.1.3-alpha): + - Fix a logic error that prevented the SessionGroup sub-option from + being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha. + + o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc): + - Fix a BUG() assertion that occurs within a very small race window + between when a client intro circuit opens and when its descriptor + gets cleaned up from the cache. The circuit is now closed early, + which will trigger a re-fetch of the descriptor and continue the + connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (clock skew detection, backport from 0.4.1.5): + - Don't believe clock skew results from NETINFO cells that appear to + arrive before we sent the VERSIONS cells they are responding to. + Previously, we would accept them up to 3 minutes "in the past". + Fixes bug 31343; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (compilation warning, backport from 0.4.1.5): + - Fix a compilation warning on Windows about casting a function + pointer for GetTickCount64(). Fixes bug 31374; bugfix + on 0.2.9.1-alpha. + + o Minor bugfixes (compilation, backport from 0.4.0.2-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 (compilation, backport from 0.4.1.5): + - Avoid using labs() on time_t, which can cause compilation warnings + on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (compilation, backport from 0.4.2.1-alpha): + - Suppress spurious float-conversion warnings from GCC when calling + floating-point classifier functions on FreeBSD. Fixes part of bug + 31687; bugfix on 0.3.1.5-alpha. + + o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha): + - 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 (configuration, proxies, backport from 0.4.1.2-alpha): + - 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 (connections, backport from 0.4.2.3-rc): + - Avoid trying to read data from closed connections, which can cause + needless loops in Libevent and infinite loops in Shadow. Fixes bug + 30344; bugfix on 0.1.1.1-alpha. + + o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha): + - Allow the test-stem job to fail in Travis, because it sometimes + hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha. + - Skip test_rebind on macOS in Travis, because it is unreliable on + macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha. + - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment + variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc): + - Avoid a set of possible code paths that could try to use freed + memory in routerlist_free() while Tor was exiting. Fixes bug + 31003; bugfix on 0.1.2.2-alpha. + + o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha): + - Stop crashing after parsing an unknown descriptor purpose + annotation. We think this bug can only be triggered by modifying a + local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha. + + o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha): + - 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 (error handling, backport from 0.4.2.1-alpha): + - On abort, try harder to flush the output buffers of log messages. + On some platforms (macOS), log messages could be discarded when + the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha. + - Report the tor version whenever an assertion fails. Previously, we + only reported the Tor version on some crashes, and some non-fatal + assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha): + - When extracting an IPv6 address from a PF-based proxy, verify that + we are actually configured to receive an IPv6 address, and log an + internal error if not. Fixes part of bug 31687; bugfix + on 0.2.3.4-alpha. + + o Minor bugfixes (guards, backport from 0.4.2.1-alpha): + - When tor is missing descriptors for some primary entry guards, + make the log message less alarming. It's normal for descriptors to + expire, as long as tor fetches new ones soon after. Fixes bug + 31657; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (logging, backport from 0.4.0.2-alpha): + - Avoid logging that we are relaxing a circuit timeout when that + timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha. + + o Minor bugfixes (logging, backport from 0.4.0.3-alpha): + - 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 (logging, backport from 0.4.1.1-alpha): + - 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. + + o Minor bugfixes (logging, backport from 0.4.2.1-alpha): + - Change log level of message "Hash of session info was not as + expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix + on 0.1.1.10-alpha. + + o Minor bugfixes (logging, backport from 0.4.2.2-alpha): + - Rate-limit our the logging message about the obsolete .exit + notation. Previously, there was no limit on this warning, which + could potentially be triggered many times by a hostile website. + Fixes bug 31466; bugfix on 0.2.2.1-alpha. + + o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha): + - Do not log a nonfatal assertion failure when receiving a VERSIONS + cell on a connection using the obsolete v1 link protocol. Log a + protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha): + - Reset the periodic events' "enabled" flag when Tor is shut down + cleanly. Previously, this flag was left on, which caused periodic + events not to be re-enabled when Tor was relaunched in-process + with tor_api.h after a shutdown. Fixes bug 32058; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha): + - 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 (memory leak, backport from 0.4.1.4-rc): + - Fix a trivial memory leak when parsing an invalid value + from a download schedule in the configuration. Fixes bug + 30894; bugfix on 0.3.4.1-alpha. + + o Minor bugfixes (memory management, backport from 0.4.0.3-alpha): + - 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, backport from 0.4.0.3-alpha): + - 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 (onion services, backport from 0.4.1.1-alpha): + - 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. + + o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha): + - 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, backport from 0.4.1.2-alpha): + - 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 (relay, backport from 0.4.2.2-alpha): + - Avoid crashing when starting with a corrupt keys directory where + the old ntor key and the new ntor key are identical. Fixes bug + 30916; bugfix on 0.2.4.8-alpha. + + o Minor bugfixes (rust, backport from 0.4.0.5): + - 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 (rust, backport from 0.4.2.1-alpha): + - Correctly exclude a redundant rust build job in Travis. Fixes bug + 31463; bugfix on 0.3.5.4-alpha. + + o Minor bugfixes (single onion services, backport from 0.4.0.3-alpha): + - 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, backport from 0.4.0.3-alpha): + - 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, backport from 0.4.0.3-alpha): + - 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. + + o Minor bugfixes (testing, backport from 0.4.0.4-rc): + - 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 (testing, backport from 0.4.2.3-alpha): + - When testing port rebinding, don't busy-wait for tor to log. + Instead, actually sleep for a short time before polling again. + Also improve the formatting of control commands and log messages. + Fixes bug 31837; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (TLS protocol, backport form 0.4.0.4-rc): + - 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 Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha): + - Log bugs about the TLS read buffer's length only once, rather than + filling the logs with similar warnings. Fixes bug 31939; bugfix + on 0.3.0.4-rc. + + o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha): + - Always retry v2 single onion service intro and rend circuits with + a 3-hop path. Previously, v2 single onion services used a 3-hop + path when rendezvous circuits were retried after a remote or + delayed failure, but a 1-hop path for immediate retries. Fixes bug + 23818; bugfix on 0.2.9.3-alpha. + - Make v3 single onion services fall back to a 3-hop intro, when all + intro points are unreachable via a 1-hop path. Previously, v3 + single onion services failed when all intro nodes were unreachable + via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (Windows, CI, backport from 0.4.0.3-alpha): + - 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. + + o Documentation (backport from 0.4.2.1-alpha): + - Use RFC 2397 data URL scheme to embed an image into tor-exit- + notice.html so that operators no longer have to host it + themselves. Closes ticket 31089. + + o Testing (backport from 0.4.1.2-alpha): + - Specify torrc paths (with empty files) when launching tor in + integration tests; refrain from reading user and system torrcs. + Resolves issue 29702. + + o Testing (continuous integration, backport from 0.4.1.1-alpha): + - In Travis, show stem's tor log after failure. Closes ticket 30234. + + o Testing (continuous integration, backport from 0.4.1.5): + - In Travis, make stem log a controller trace to the console, and + tail stem's tor log after failure. Closes ticket 30591. + - In Travis, only run the stem tests that use a tor binary. Closes + ticket 30694. + + o Testing (continuous integration, backport from 0.4.2.3-alpha): + - Disable all but one Travis CI macOS build, to mitigate slow + scheduling of Travis macOS jobs. Closes ticket 32177. + - Run the chutney IPv6 networks as part of Travis CI. Closes + ticket 30860. + - Simplify the Travis CI build matrix, and optimise for build time. + Closes ticket 31859. + - Use Windows Server 2019 instead of Windows Server 2016 in our + Appveyor builds. Closes ticket 32086. + + o Testing (continuous integration, backport from 0.4.2.4-rc): + - Use Ubuntu Bionic images for our Travis CI builds, so we can get a + recent version of coccinelle. But leave chutney on Ubuntu Trusty, + until we can fix some Bionic permissions issues (see ticket + 32240). Related to ticket 31919. + - Install the mingw OpenSSL package in Appveyor. This makes sure + that the OpenSSL headers and libraries match in Tor's Appveyor + builds. (This bug was triggered by an Appveyor image update.) + Fixes bug 32449; bugfix on 0.3.5.6-rc. + - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241. + + o Testing (continuous integration, backport from 0.4.2.5): + - Require C99 standards-conforming code in Travis CI, but allow GNU gcc + extensions. Also activates clang's -Wtypedef-redefinition warnings. + Build some jobs with -std=gnu99, and some jobs without. + Closes ticket 32500. + +Changes in version 0.4.2.4-rc - 2019-11-15 + Tor 0.4.2.4-rc is the first release candidate in its series. It fixes + several bugs from earlier versions, including a few that would result in + stack traces or incorrect behavior. + + o Minor features (build system): + - Make pkg-config use --prefix when cross-compiling, if + PKG_CONFIG_PATH is not set. Closes ticket 32191. + + o Minor features (geoip): + - Update geoip and geoip6 to the November 6 2019 Maxmind GeoLite2 + Country database. Closes ticket 32440. + + o Minor bugfixes (client, onion service v3): + - Fix a BUG() assertion that occurs within a very small race window + between when a client intro circuit opens and when its descriptor + gets cleaned up from the cache. The circuit is now closed early, + which will trigger a re-fetch of the descriptor and continue the + connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (code quality): + - Fix "make check-includes" so it runs correctly on out-of-tree + builds. Fixes bug 31335; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (configuration): + - Log the option name when skipping an obsolete option. Fixes bug + 32295; bugfix on 0.4.2.1-alpha. + + o Minor bugfixes (crash): + - When running Tor with an option like --verify-config or + --dump-config that does not start the event loop, avoid crashing + if we try to exit early because of an error. Fixes bug 32407; + bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (directory): + - When checking if a directory connection is anonymous, test if the + circuit was marked for close before looking at its channel. This + avoids a BUG() stacktrace if the circuit was previously closed. + Fixes bug 31958; bugfix on 0.4.2.1-alpha. + + o Minor bugfixes (shellcheck): + - Fix minor shellcheck errors in the git-*.sh scripts. Fixes bug + 32402; bugfix on 0.4.2.1-alpha. + - Start checking most scripts for shellcheck errors again. Fixes bug + 32402; bugfix on 0.4.2.1-alpha. + + o Testing (continuous integration): + - Use Ubuntu Bionic images for our Travis CI builds, so we can get a + recent version of coccinelle. But leave chutney on Ubuntu Trusty, + until we can fix some Bionic permissions issues (see ticket + 32240). Related to ticket 31919. + - Install the mingw OpenSSL package in Appveyor. This makes sure + that the OpenSSL headers and libraries match in Tor's Appveyor + builds. (This bug was triggered by an Appveyor image update.) + Fixes bug 32449; bugfix on 0.3.5.6-rc. + - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241. + + +Changes in version 0.4.2.3-alpha - 2019-10-24 + This release fixes several bugs from the previous alpha release, and + from earlier versions of Tor. + + o Major bugfixes (relay): + - Relays now respect their AccountingMax bandwidth again. When + relays entered "soft" hibernation (which typically starts when + we've hit 90% of our AccountingMax), we had stopped checking + whether we should enter hard hibernation. Soft hibernation refuses + new connections and new circuits, but the existing circuits can + continue, meaning that relays could have exceeded their configured + AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha. + + o Major bugfixes (v3 onion services): + - Onion services now always use the exact number of intro points + configured with the HiddenServiceNumIntroductionPoints option (or + fewer if nodes are excluded). Before, a service could sometimes + pick more intro points than configured. Fixes bug 31548; bugfix + on 0.3.2.1-alpha. + + o Minor feature (onion services, control port): + - The ADD_ONION command's keyword "BEST" now defaults to ED25519-V3 + (v3) onion services. Previously it defaulted to RSA1024 (v2). + Closes ticket 29669. + + o Minor features (testing): + - When running tests that attempt to look up hostnames, replace the + libc name lookup functions with ones that do not actually touch + the network. This way, the tests complete more quickly in the + presence of a slow or missing DNS resolver. Closes ticket 31841. + + o Minor features (testing, continuous integration): + - Disable all but one Travis CI macOS build, to mitigate slow + scheduling of Travis macOS jobs. Closes ticket 32177. + - Run the chutney IPv6 networks as part of Travis CI. Closes + ticket 30860. + - Simplify the Travis CI build matrix, and optimise for build time. + Closes ticket 31859. + - Use Windows Server 2019 instead of Windows Server 2016 in our + Appveyor builds. Closes ticket 32086. + + o Minor bugfixes (build system): + - Interpret "--disable-module-dirauth=no" correctly. Fixes bug + 32124; bugfix on 0.3.4.1-alpha. + - Interpret "--with-tcmalloc=no" correctly. Fixes bug 32124; bugfix + on 0.2.0.20-rc. + - Stop failing when jemalloc is requested, but tcmalloc is not + found. Fixes bug 32124; bugfix on 0.3.5.1-alpha. + - When pkg-config is not installed, or a library that depends on + pkg-config is not found, tell the user what to do to fix the + problem. Fixes bug 31922; bugfix on 0.3.1.1-alpha. + + o Minor bugfixes (connections): + - Avoid trying to read data from closed connections, which can cause + needless loops in Libevent and infinite loops in Shadow. Fixes bug + 30344; bugfix on 0.1.1.1-alpha. + + o Minor bugfixes (error handling): + - Always lock the backtrace buffer before it is used. Fixes bug + 31734; bugfix on 0.2.5.3-alpha. + + o Minor bugfixes (mainloop, periodic events, in-process API): + - Reset the periodic events' "enabled" flag when Tor is shut down + cleanly. Previously, this flag was left on, which caused periodic + events not to be re-enabled when Tor was relaunched in-process + with tor_api.h after a shutdown. Fixes bug 32058; bugfix + on 0.3.3.1-alpha. + + o Minor bugfixes (process management): + - Remove overly strict assertions that triggered when a pluggable + transport failed to launch. Fixes bug 31091; bugfix + on 0.4.0.1-alpha. + - Remove an assertion in the Unix process backend. This assertion + would trigger when we failed to find the executable for a child + process. Fixes bug 31810; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (testing): + - Avoid intermittent test failures due to a test that had relied on + inconsistent timing sources. Fixes bug 31995; bugfix + on 0.3.1.3-alpha. + - When testing port rebinding, don't busy-wait for tor to log. + Instead, actually sleep for a short time before polling again. + Also improve the formatting of control commands and log messages. + Fixes bug 31837; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (tls, logging): + - Log bugs about the TLS read buffer's length only once, rather than + filling the logs with similar warnings. Fixes bug 31939; bugfix + on 0.3.0.4-rc. + + o Minor bugfixes (v3 onion services): + - Fix an implicit conversion from ssize_t to size_t discovered by + Coverity. Fixes bug 31682; bugfix on 0.4.2.1-alpha. + - Fix a memory leak in an unlikely error code path when encoding HS + DoS establish intro extension cell. Fixes bug 32063; bugfix + on 0.4.2.1-alpha. + - When cleaning up intro circuits for a v3 onion service, don't + remove circuits that have an established or pending circuit, even + if they ran out of retries. This way, we don't remove a circuit on + its last retry. Fixes bug 31652; bugfix on 0.3.2.1-alpha. + + o Documentation: + - Correct the description of "GuardLifetime". Fixes bug 31189; + bugfix on 0.3.0.1-alpha. + - Make clear in the man page, in both the bandwidth section and the + AccountingMax section, that Tor counts in powers of two, not + powers of ten: 1 GByte is 1024*1024*1024 bytes, not one billion + bytes. Resolves ticket 32106. + + +Changes in version 0.4.2.2-alpha - 2019-10-07 + This release fixes several bugs from the previous alpha release, and + from earlier versions. It also includes a change in authorities, so + that they begin to reject the currently unsupported release series. + + o Major features (directory authorities): + - Directory authorities now reject relays running all currently + deprecated release series. The currently supported release series + are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549. + + o Major bugfixes (embedded Tor): + - Avoid a possible crash when restarting Tor in embedded mode and + enabling a different set of publish/subscribe messages. Fixes bug + 31898; bugfix on 0.4.1.1-alpha. + + o Major bugfixes (torrc parsing): + - Stop ignoring torrc options after an %include directive, when the + included directory ends with a file that does not contain any + config options (but does contain comments or whitespace). Fixes + bug 31408; bugfix on 0.3.1.1-alpha. + + o Minor features (auto-formatting scripts): + - When annotating C macros, never generate a line that our check- + spaces script would reject. Closes ticket 31759. + - When annotating C macros, try to remove cases of double-negation. + Closes ticket 31779. + + o Minor features (continuous integration): + - When building on Appveyor and Travis, pass the "-k" flag to make, + so that we are informed of all compilation failures, not just the + first one or two. Closes ticket 31372. + + o Minor features (geoip): + - Update geoip and geoip6 to the October 1 2019 Maxmind GeoLite2 + Country database. Closes ticket 31931. + + o Minor features (maintenance scripts): + - Add a Coccinelle script to detect bugs caused by incrementing or + decrementing a variable inside a call to log_debug(). Since + log_debug() is a macro whose arguments are conditionally + evaluated, it is usually an error to do this. One such bug was + 30628, in which SENDME cells were miscounted by a decrement + operator inside a log_debug() call. Closes ticket 30743. + + o Minor features (onion services v3): + - Assist users who try to setup v2 client authorization in v3 onion + services by pointing them to the right documentation. Closes + ticket 28966. + + o Minor bugfixes (Appveyor continuous integration): + - Avoid spurious errors when Appveyor CI fails before the install + step. Fixes bug 31884; bugfix on 0.3.4.2-alpha. + + o Minor bugfixes (best practices tracker): + - When listing overbroad exceptions, do not also list problems, and + do not list insufficiently broad exceptions. Fixes bug 31338; + bugfix on 0.4.2.1-alpha. + + o Minor bugfixes (controller protocol): + - Fix the MAPADDRESS controller command to accept one or more + arguments. Previously, it required two or more arguments, and + ignored the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (logging): + - Add a missing check for HAVE_PTHREAD_H, because the backtrace code + uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha. + - Disable backtrace signal handlers when shutting down tor. Fixes + bug 31614; bugfix on 0.2.5.2-alpha. + - Rate-limit our the logging message about the obsolete .exit + notation. Previously, there was no limit on this warning, which + could potentially be triggered many times by a hostile website. + Fixes bug 31466; bugfix on 0.2.2.1-alpha. + - When initialising log domain masks, only set known log domains. + Fixes bug 31854; bugfix on 0.2.1.1-alpha. + + o Minor bugfixes (logging, protocol violations): + - Do not log a nonfatal assertion failure when receiving a VERSIONS + cell on a connection using the obsolete v1 link protocol. Log a + protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (modules): + - Explain what the optional Directory Authority module is, and what + happens when it is disabled. Fixes bug 31825; bugfix + on 0.3.4.1-alpha. + + o Minor bugfixes (multithreading): + - Avoid some undefined behaviour when freeing mutexes. Fixes bug + 31736; bugfix on 0.0.7. + + o Minor bugfixes (relay): + - Avoid crashing when starting with a corrupt keys directory where + the old ntor key and the new ntor key are identical. Fixes bug + 30916; bugfix on 0.2.4.8-alpha. + + o Minor bugfixes (tests, SunOS): + - Avoid a map_anon_nofork test failure due to a signed/unsigned + integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha. + + o Code simplification and refactoring: + - Refactor connection_control_process_inbuf() to reduce the size of + a practracker exception. Closes ticket 31840. + - Refactor the microdescs_parse_from_string() function into smaller + pieces, for better comprehensibility. Closes ticket 31675. + - Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes in the unit + tests and fuzzers, rather than using hard-coded values. Closes + ticket 31334. + - Interface for function `decrypt_desc_layer` cleaned up. Closes + ticket 31589. + + o Documentation: + - Document the signal-safe logging behaviour in the tor man page. + Also add some comments to the relevant functions. Closes + ticket 31839. + - Explain why we can't destroy the backtrace buffer mutex. Explain + why we don't need to destroy the log mutex. Closes ticket 31736. + - The Tor source code repository now includes a (somewhat dated) + description of Tor's modular architecture, in doc/HACKING/design. + This is based on the old "tor-guts.git" repository, which we are + adopting and superseding. Closes ticket 31849. + + +Changes in version 0.4.1.6 - 2019-09-19 + This release backports several bugfixes to improve stability and + correctness. Anyone experiencing build problems or crashes with 0.4.1.5, + or experiencing reliability issues with single onion services, should + upgrade. + + o Major bugfixes (crash, Linux, Android, backport from 0.4.2.1-alpha): + - Tolerate systems (including some Android installations) where + madvise and MADV_DONTDUMP are available at build-time, but not at + run time. Previously, these systems would notice a failed syscall + and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha. + - Tolerate systems (including some Linux installations) where + madvise and/or MADV_DONTFORK are available at build-time, but not + at run time. Previously, these systems would notice a failed + syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha. + + o Minor features (stem tests, backport from 0.4.2.1-alpha): + - Change "make test-stem" so it only runs the stem tests that use + tor. This change makes test-stem faster and more reliable. Closes + ticket 31554. + + o Minor bugfixes (build system, backport form 0.4.2.1-alpha): + - Do not include the deprecated <sys/sysctl.h> on Linux or Windows + systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha. + + o Minor bugfixes (compilation, backport from 0.4.2.1-alpha): + - Add more stub functions to fix compilation on Android with link- + time optimization when --disable-module-dirauth is used. + Previously, these compilation settings would make the compiler + look for functions that didn't exist. Fixes bug 31552; bugfix + on 0.4.1.1-alpha. + - Suppress spurious float-conversion warnings from GCC when calling + floating-point classifier functions on FreeBSD. Fixes part of bug + 31687; bugfix on 0.3.1.5-alpha. + + o Minor bugfixes (controller protocol): + - Fix the MAPADDRESS controller command to accept one or more + arguments. Previously, it required two or more arguments, and ignored + the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha): + - When extracting an IPv6 address from a PF-based proxy, verify that + we are actually configured to receive an IPv6 address, and log an + internal error if not. Fixes part of bug 31687; bugfix + on 0.2.3.4-alpha. + + o Minor bugfixes (guards, backport from 0.4.2.1-alpha): + - When tor is missing descriptors for some primary entry guards, + make the log message less alarming. It's normal for descriptors to + expire, as long as tor fetches new ones soon after. Fixes bug + 31657; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (logging, backport from 0.4.2.1-alpha): + - Change log level of message "Hash of session info was not as + expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix + on 0.1.1.10-alpha. + + o Minor bugfixes (rust, backport from 0.4.2.1-alpha): + - Correctly exclude a redundant rust build job in Travis. Fixes bug + 31463; bugfix on 0.3.5.4-alpha. + + o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha): + - Always retry v2 single onion service intro and rend circuits with + a 3-hop path. Previously, v2 single onion services used a 3-hop + path when rendezvous circuits were retried after a remote or + delayed failure, but a 1-hop path for immediate retries. Fixes bug + 23818; bugfix on 0.2.9.3-alpha. + + o Minor bugfixes (v3 single onion services, backport from 0.4.2.1-alpha): + - Always retry v3 single onion service intro and rend circuits with + a 3-hop path. Previously, v3 single onion services used a 3-hop + path when rend circuits were retried after a remote or delayed + failure, but a 1-hop path for immediate retries. Fixes bug 23818; + bugfix on 0.3.2.1-alpha. + - Make v3 single onion services fall back to a 3-hop intro, when all + intro points are unreachable via a 1-hop path. Previously, v3 + single onion services failed when all intro nodes were unreachable + via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha. + + o Documentation (backport from 0.4.2.1-alpha): + - Use RFC 2397 data URL scheme to embed an image into tor-exit- + notice.html so that operators no longer have to host it + themselves. Closes ticket 31089. + + +Changes in version 0.4.2.1-alpha - 2019-09-17 + This is the first alpha release in the 0.4.2.x series. It adds new + defenses for denial-of-service attacks against onion services. It also + includes numerous kinds of bugfixes and refactoring to help improve + Tor's stability and ease of development. + + o Major features (onion service v3, denial of service): + - Add onion service introduction denial of service defenses. Intro + points can now rate-limit client introduction requests, using + parameters that can be sent by the service within the + ESTABLISH_INTRO cell. If the cell extension for this is not used, + the intro point will honor the consensus parameters. Closes + ticket 30924. + + o Major bugfixes (circuit build, guard): + - When considering upgrading circuits from "waiting for guard" to + "open", always ignore circuits that are marked for close. + Previously we could end up in the situation where a subsystem is + notified of a circuit opening, but the circuit is still marked for + close, leading to undesirable behavior. Fixes bug 30871; bugfix + on 0.3.0.1-alpha. + + o Major bugfixes (crash, Linux, Android): + - Tolerate systems (including some Android installations) where + madvise and MADV_DONTDUMP are available at build-time, but not at + run time. Previously, these systems would notice a failed syscall + and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha. + - Tolerate systems (including some Linux installations) where + madvise and/or MADV_DONTFORK are available at build-time, but not + at run time. Previously, these systems would notice a failed + syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha. + + o Minor features (best practices tracker): + - Our best-practices tracker now integrates with our include-checker + tool to keep track of how many layering violations we have not yet + fixed. We hope to reduce this number over time to improve Tor's + modularity. Closes ticket 31176. + - Add a TOR_PRACTRACKER_OPTIONS variable for passing arguments to + practracker from the environment. We may want this for continuous + integration. Closes ticket 31309. + - Give a warning rather than an error when a practracker exception + is violated by a small amount, add a --list-overbroad option to + practracker that lists exceptions that are stricter than they need + to be, and provide an environment variable for disabling + practracker. Closes ticket 30752. + - Our best-practices tracker now looks at headers as well as C + files. Closes ticket 31175. + + o Minor features (build system): + - Add --disable-manpage and --disable-html-manual options to + configure script. This will enable shortening build times by not + building documentation. Resolves issue 19381. + + o Minor features (compilation): + - Log a more useful error message when we are compiling and one of + the compile-time hardening options we have selected can be linked + but not executed. Closes ticket 27530. + + o Minor features (configuration): + - The configuration code has been extended to allow splitting + configuration data across multiple objects. Previously, all + configuration data needed to be kept in a single object, which + tended to become bloated. Closes ticket 31240. + + o Minor features (continuous integration): + - When running CI builds on Travis, put some random data in + ~/.torrc, to make sure no tests are reading the Tor configuration + file from its default location. Resolves issue 30102. + + o Minor features (debugging): + - Log a nonfatal assertion failure if we encounter a configuration + line whose command is "CLEAR" but which has a nonempty value. This + should be impossible, according to the rules of our configuration + line parsing. Closes ticket 31529. + + o Minor features (git hooks): + - Our pre-commit git hook now checks for a special file before + running practracker, so that practracker only runs on branches + that are based on master. Since the pre-push hook calls the pre- + commit hook, practracker will also only run before pushes of + branches based on master. Closes ticket 30979. + + o Minor features (git scripts): + - Add a "--" command-line argument, to separate git-push-all.sh + script arguments from arguments that are passed through to git + push. Closes ticket 31314. + - Add a -r <remote-name> argument to git-push-all.sh, so the script + can push test branches to a personal remote. Closes ticket 31314. + - Add a -t <test-branch-prefix> argument to git-merge-forward.sh and + git-push-all.sh, which makes these scripts create, merge forward, + and push test branches. Closes ticket 31314. + - Add a -u argument to git-merge-forward.sh, so that the script can + re-use existing test branches after a merge failure and fix. + Closes ticket 31314. + - Add a TOR_GIT_PUSH env var, which sets the default git push + command and arguments for git-push-all.sh. Closes ticket 31314. + - Add a TOR_PUSH_DELAY variable to git-push-all.sh, which makes the + script push master and maint branches with a delay between each + branch. These delays trigger the CI jobs in a set order, which + should show the most likely failures first. Also make pushes + atomic by default, and make the script pass any command-line + arguments to git push. Closes ticket 29879. + - Call the shellcheck script from the pre-commit hook. Closes + ticket 30967. + - Skip pushing test branches that are the same as a remote + maint/release/master branch in git-push-all.sh by default. Add a + -s argument, so git-push-all.sh can push all test branches. Closes + ticket 31314. + + o Minor features (IPv6, logging): + - Log IPv6 addresses as well as IPv4 addresses when describing + routerinfos, routerstatuses, and nodes. Closes ticket 21003. + + o Minor features (onion service v3): + - Do not allow single hop clients to fetch or post an HS descriptor + from an HSDir. Closes ticket 24964. + + o Minor features (onion service): + - Disallow single-hop clients at the introduction point. We've + removed Tor2web support a while back and single-hop rendezvous + attempts are blocked at the relays. This change should remove load + off the network from spammy clients. Close ticket 24963. + + o Minor features (stem tests): + - Change "make test-stem" so it only runs the stem tests that use + tor. This change makes test-stem faster and more reliable. Closes + ticket 31554. + + o Minor features (testing): + - Add a script to invoke "tor --dump-config" and "tor + --verify-config" with various configuration options, and see + whether tor's resulting configuration or error messages are what + we expect. Use it for integration testing of our +Option and + /Option flags. Closes ticket 31637. + - Improve test coverage for our existing configuration parsing and + management API. Closes ticket 30893. + - Add integration tests to make sure that practracker gives the + outputs we expect. Closes ticket 31477. + - The practracker self-tests are now run as part of the Tor test + suite. Closes ticket 31304. + + o Minor features (token bucket): + - Implement a generic token bucket that uses a single counter, for + use in anti-DoS onion service work. Closes ticket 30687. + + o Minor bugfixes (best practices tracker): + - Fix a few issues in the best-practices script, including tests, + tab tolerance, error reporting, and directory-exclusion logic. + Fixes bug 29746; bugfix on 0.4.1.1-alpha. + - When running check-best-practices, only consider files in the src + subdirectory. Previously we had recursively considered all + subdirectories, which made us get confused by the temporary + directories made by "make distcheck". Fixes bug 31578; bugfix + on 0.4.1.1-alpha. + + o Minor bugfixes (build system): + - Do not include the deprecated <sys/sysctl.h> on Linux or Windows + systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha. + + o Minor bugfixes (chutney, makefiles, documentation): + - "make test-network-all" now shows the warnings from each test- + network.sh run on the console, so developers see new warnings + early. We've also improved the documentation for this feature, and + renamed a Makefile variable so the code is self-documenting. Fixes + bug 30455; bugfix on 0.3.0.4-rc. + + o Minor bugfixes (compilation): + - Add more stub functions to fix compilation on Android with link- + time optimization when --disable-module-dirauth is used. + Previously, these compilation settings would make the compiler + look for functions that didn't exist. Fixes bug 31552; bugfix + on 0.4.1.1-alpha. + - Suppress spurious float-conversion warnings from GCC when calling + floating-point classifier functions on FreeBSD. Fixes part of bug + 31687; bugfix on 0.3.1.5-alpha. + + o Minor bugfixes (configuration): + - Invalid floating-point values in the configuration file are now + treated as errors in the configuration. Previously, they were + ignored and treated as zero. Fixes bug 31475; bugfix on 0.0.1. + + o Minor bugfixes (coverity): + - Add an assertion when parsing a BEGIN cell so that coverity can be + sure that we are not about to dereference a NULL address. Fixes + bug 31026; bugfix on 0.2.4.7-alpha. This is CID 1447296. + - In our siphash implementation, when building for coverity, use + memcpy in place of a switch statement, so that coverity can tell + we are not accessing out-of-bounds memory. Fixes bug 31025; bugfix + on 0.2.8.1-alpha. This is tracked as CID 1447293 and 1447295. + - Fix several coverity warnings from our unit tests. Fixes bug + 31030; bugfix on 0.2.4.1-alpha, 0.3.2.1-alpha, and 0.4.0.1-alpha. + + o Minor bugfixes (developer tooling): + - Only log git script changes in the post-merge script when the + merge was to the master branch. Fixes bug 31040; bugfix + on 0.4.1.1-alpha. + + o Minor bugfixes (directory authorities): + - Return a distinct status when formatting annotations fails. Fixes + bug 30780; bugfix on 0.2.0.8-alpha. + + o Minor bugfixes (error handling): + - On abort, try harder to flush the output buffers of log messages. + On some platforms (macOS), log messages could be discarded when + the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha. + - Report the tor version whenever an assertion fails. Previously, we + only reported the Tor version on some crashes, and some non-fatal + assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha. + - When tor aborts due to an error, close log file descriptors before + aborting. Closing the logs makes some OSes flush log file buffers, + rather than deleting buffered log lines. Fixes bug 31594; bugfix + on 0.2.5.2-alpha. + + o Minor bugfixes (FreeBSD, PF-based proxy, IPv6): + - When extracting an IPv6 address from a PF-based proxy, verify that + we are actually configured to receive an IPv6 address, and log an + internal error if not. Fixes part of bug 31687; bugfix + on 0.2.3.4-alpha. + + o Minor bugfixes (git hooks): + - Remove a duplicate call to practracker from the pre-push hook. The + pre-push hook already calls the pre-commit hook, which calls + practracker. Fixes bug 31462; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (git scripts): + - Stop hard-coding the bash path in the git scripts. Some OSes don't + have bash in /usr/bin, others have an ancient bash at this path. + Fixes bug 30840; bugfix on 0.4.0.1-alpha. + - Stop hard-coding the tor master branch name and worktree path in + the git scripts. Fixes bug 30841; bugfix on 0.4.0.1-alpha. + - Allow git-push-all.sh to be run from any directory. Previously, + the script only worked if run from an upstream worktree directory. + Closes ticket 31678. + + o Minor bugfixes (guards): + - When tor is missing descriptors for some primary entry guards, + make the log message less alarming. It's normal for descriptors to + expire, as long as tor fetches new ones soon after. Fixes bug + 31657; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (ipv6): + - Check for private IPv6 addresses alongside their IPv4 equivalents + when authorities check descriptors. Previously, we only checked + for private IPv4 addresses. Fixes bug 31088; bugfix on + 0.2.3.21-rc. Patch by Neel Chauhan. + - When parsing microdescriptors, we should check the IPv6 exit + policy alongside IPv4. Previously, we checked both exit policies + for only router info structures, while microdescriptors were + IPv4-only. Fixes bug 27284; bugfix on 0.2.3.1-alpha. Patch by + Neel Chauhan. + + o Minor bugfixes (logging): + - Change log level of message "Hash of session info was not as + expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix + on 0.1.1.10-alpha. + - Fix a code issue that would have broken our parsing of log domains + as soon as we had 33 of them. Fortunately, we still only have 29. + Fixes bug 31451; bugfix on 0.4.1.4-rc. + + o Minor bugfixes (memory management): + - Stop leaking a small amount of memory in nt_service_install(), in + unreachable code. Fixes bug 30799; bugfix on 0.2.0.7-alpha. Patch + by Xiaoyin Liu. + + o Minor bugfixes (networking, IP addresses): + - When parsing addresses via Tor's internal DNS lookup API, reject + IPv4 addresses in square brackets, and accept IPv6 addresses in + square brackets. This change completes the work started in 23082, + making address parsing consistent between tor's internal DNS + lookup and address parsing APIs. Fixes bug 30721; bugfix + on 0.2.1.5-alpha. + - When parsing addresses via Tor's internal address:port parsing and + DNS lookup APIs, require IPv6 addresses with ports to have square + brackets. But allow IPv6 addresses without ports, whether or not + they have square brackets. Fixes bug 30721; bugfix + on 0.2.1.5-alpha. + + o Minor bugfixes (onion service v3): + - When purging the client descriptor cache, close any introduction + point circuits associated with purged cache entries. This avoids + picking those circuits later when connecting to the same + introduction points. Fixes bug 30921; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (onion services): + - In the hs_ident_circuit_t data structure, remove the unused field + circuit_type and the respective argument in hs_ident_circuit_new(). + This field was set by clients (for introduction) and services (for + introduction and rendezvous) but was never used afterwards. Fixes + bug 31490; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan. + + o Minor bugfixes (operator tools): + - Make tor-print-ed-signing-cert(1) print certificate expiration + date in RFC 1123 and UNIX timestamp formats, to make output + machine readable. Fixes bug 31012; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (rust): + - Correctly exclude a redundant rust build job in Travis. Fixes bug + 31463; bugfix on 0.3.5.4-alpha. + - Raise the minimum rustc version to 1.31.0, as checked by configure + and CI. Fixes bug 31442; bugfix on 0.3.5.4-alpha. + + o Minor bugfixes (sendme, code structure): + - Rename the trunnel SENDME file definition from sendme.trunnel to + sendme_cell.trunnel to avoid having twice sendme.{c|h} in the + repository. Fixes bug 30769; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (statistics): + - Stop removing the ed25519 signature if the extra info file is too + big. If the signature data was removed, but the keyword was kept, + this could result in an unparseable extra info file. Fixes bug + 30958; bugfix on 0.2.7.2-alpha. + + o Minor bugfixes (subsystems): + - Make the subsystem init order match the subsystem module + dependencies. Call windows process security APIs as early as + possible. Initialize logging before network and time, so that + network and time can use logging. Fixes bug 31615; bugfix + on 0.4.0.1-alpha. + + o Minor bugfixes (testing): + - Teach the util/socketpair_ersatz test to work correctly when we + have no network stack configured. Fixes bug 30804; bugfix + on 0.2.5.1-alpha. + + o Minor bugfixes (v2 single onion services): + - Always retry v2 single onion service intro and rend circuits with + a 3-hop path. Previously, v2 single onion services used a 3-hop + path when rendezvous circuits were retried after a remote or + delayed failure, but a 1-hop path for immediate retries. Fixes bug + 23818; bugfix on 0.2.9.3-alpha. + + o Minor bugfixes (v3 single onion services): + - Always retry v3 single onion service intro and rend circuits with + a 3-hop path. Previously, v3 single onion services used a 3-hop + path when rend circuits were retried after a remote or delayed + failure, but a 1-hop path for immediate retries. Fixes bug 23818; + bugfix on 0.3.2.1-alpha. + - Make v3 single onion services fall back to a 3-hop intro, when all + intro points are unreachable via a 1-hop path. Previously, v3 + single onion services failed when all intro nodes were unreachable + via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha. + + o Documentation: + - Improve documentation in circuit padding subsystem. Patch by + Tobias Pulls. Closes ticket 31113. + - Include an example usage for IPv6 ORPort in our sample torrc. + Closes ticket 31320; patch from Ali Raheem. + - Use RFC 2397 data URL scheme to embed an image into tor-exit- + notice.html so that operators no longer have to host it + themselves. Closes ticket 31089. + + o Removed features: + - No longer include recommended package digests in votes as detailed + in proposal 301. The RecommendedPackages torrc option is + deprecated and will no longer have any effect. "package" lines + will still be considered when computing consensuses for consensus + methods that include them. (This change has no effect on the list + of recommended Tor versions, which is still in use.) Closes + ticket 29738. + - Remove torctl.in from contrib/dist directory. Resolves + ticket 30550. + + o Testing: + - Run shellcheck for all non-third-party shell scripts that are + shipped with Tor. Closes ticket 29533. + - When checking shell scripts, ignore any user-created directories. + Closes ticket 30967. + + o Code simplification and refactoring (config handling): + - Extract our variable manipulation code from confparse.c to a new + lower-level typedvar.h module. Closes ticket 30864. + - Lower another layer of object management from confparse.c to a + more general tool. Now typed structure members are accessible via + an abstract type. Implements ticket 30914. + - Move our backend logic for working with configuration and state + files into a lower-level library, since it no longer depends on + any tor-specific functionality. Closes ticket 31626. + - Numerous simplifications in configuration-handling logic: remove + duplicated macro definitions, replace magical names with flags, + and refactor "TestingTorNetwork" to use the same default-option + logic as the rest of Tor. Closes ticket 30935. + - Replace our ad-hoc set of flags for configuration variables and + configuration variable types with fine-grained orthogonal flags + corresponding to the actual behavior we want. Closes ticket 31625. + + o Code simplification and refactoring (misc): + - Eliminate some uses of lower-level control reply abstractions, + primarily in the onion_helper functions. Closes ticket 30889. + - Rework bootstrap tracking to use the new publish-subscribe + subsystem. Closes ticket 29976. + - Rewrite format_node_description() and router_get_verbose_nickname() + to use strlcpy() and strlcat(). The previous implementation used + memcpy() and pointer arithmetic, which was error-prone. Closes + ticket 31545. This is CID 1452819. + - Split extrainfo_dump_to_string() into smaller functions. Closes + ticket 30956. + - Use the ptrdiff_t type consistently for expressing variable + offsets and pointer differences. Previously we incorrectly (but + harmlessly) used int and sometimes off_t for these cases. Closes + ticket 31532. + - Use the subsystems mechanism to manage the main event loop code. + Closes ticket 30806. + - Various simplifications and minor improvements to the circuit + padding machines. Patch by Tobias Pulls. Closes tickets 31112 + and 31098. + + o Documentation (hard-coded directories): + - Improve the documentation for the DirAuthority and FallbackDir + torrc options. Closes ticket 30955. + + o Documentation (tor.1 man page): + - Fix typo in tor.1 man page: the option is "--help", not "-help". + Fixes bug 31008; bugfix on 0.2.2.9-alpha. + + +Changes in version 0.4.1.5 - 2019-08-20 + This is the first stable release in the 0.4.1.x series. This series + adds experimental circuit-level padding, authenticated SENDME cells to + defend against certain attacks, and several performance improvements + to save on CPU consumption. It fixes bugs in bootstrapping and v3 + onion services. It also includes numerous smaller features and + bugfixes on earlier versions. + + Per our support policy, we will support the 0.4.1.x series for nine + months, or until three months after the release of a stable 0.4.2.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 0.4.1.4-rc. For a complete list of changes + since 0.4.0.5, see the ReleaseNotes file. + + o Directory authority changes: + - The directory authority "dizum" has a new IP address. Closes + ticket 31406. + + o Minor features (circuit padding logging): + - Demote noisy client-side warn logs about circuit padding to + protocol warnings. Add additional log messages and circuit ID + fields to help with bug 30992 and any other future issues. + + o Minor bugfixes (circuit padding negotiation): + - Bump the circuit padding protocol version to explicitly signify + that the HS setup machine support is finalized in 0.4.1.x-stable. + This also means that 0.4.1.x-alpha clients will not negotiate + padding with 0.4.1.x-stable relays, and 0.4.1.x-stable clients + will not negotiate padding with 0.4.1.x-alpha relays (or 0.4.0.x + relays). Fixes bug 31356; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (circuit padding): + - Ignore non-padding cells on padding circuits. This addresses + various warning messages from subsystems that were not expecting + padding circuits. Fixes bug 30942; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (clock skew detection): + - Don't believe clock skew results from NETINFO cells that appear to + arrive before we sent the VERSIONS cells they are responding to. + Previously, we would accept them up to 3 minutes "in the past". + Fixes bug 31343; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (compatibility, standards compliance): + - Fix a bug that would invoke undefined behavior on certain + operating systems when trying to asprintf() a string exactly + INT_MAX bytes long. We don't believe this is exploitable, but it's + better to fix it anyway. Fixes bug 31001; bugfix on 0.2.2.11-alpha. + Found and fixed by Tobias Stoeckmann. + + o Minor bugfixes (compilation warning): + - Fix a compilation warning on Windows about casting a function + pointer for GetTickCount64(). Fixes bug 31374; bugfix + on 0.2.9.1-alpha. + + o Minor bugfixes (compilation): + - Avoid using labs() on time_t, which can cause compilation warnings + on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha. + + o Minor bugfixes (distribution): + - Do not ship any temporary files found in the + scripts/maint/practracker directory. Fixes bug 31311; bugfix + on 0.4.1.1-alpha. + + o Testing (continuous integration): + - In Travis, make stem log a controller trace to the console, and + tail stem's tor log after failure. Closes ticket 30591. + - In Travis, only run the stem tests that use a tor binary. Closes + ticket 30694. + + +Changes in version 0.4.1.4-rc - 2019-07-25 + Tor 0.4.1.4-rc fixes a few bugs from previous versions of Tor, and + updates to a new list of fallback directories. If no new bugs are + found, the next release in the 0.4.1.x serious should be stable. + + o Major bugfixes (circuit build, guard): + - When considering upgrading circuits from "waiting for guard" to + "open", always ignore circuits that are marked for close. Otherwise, + we can end up in the situation where a subsystem is notified that + a closing circuit has just opened, leading to undesirable + behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha. + + o Minor features (continuous integration): + - Our Travis configuration now uses Chutney to run some network + integration tests automatically. Closes ticket 29280. + + o Minor features (fallback directory list): + - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc + in December 2018 (of which ~122 were still functional), with a + list of 148 fallbacks (70 new, 78 existing, 79 removed) generated + in June 2019. Closes ticket 28795. + + o Minor bugfixes (circuit padding): + - On relays, properly check that a padding machine is absent before + logging a warning about it being absent. Fixes bug 30649; bugfix + on 0.4.0.1-alpha. + - Add two NULL checks in unreachable places to silence Coverity (CID + 144729 and 1447291) and better future-proof ourselves. Fixes bug + 31024; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (crash on exit): + - Avoid a set of possible code paths that could try to use freed + memory in routerlist_free() while Tor was exiting. Fixes bug + 31003; bugfix on 0.1.2.2-alpha. + + o Minor bugfixes (logging): + - Fix a conflict between the flag used for messaging-domain log + messages, and the LD_NO_MOCK testing flag. Fixes bug 31080; bugfix + on 0.4.1.1-alpha. + + o Minor bugfixes (memory leaks): + - Fix a trivial memory leak when parsing an invalid value from a + download schedule in the configuration. Fixes bug 30894; bugfix + on 0.3.4.1-alpha. + + o Code simplification and refactoring: + - Remove some dead code from circpad_machine_remove_token() to fix + some Coverity warnings (CID 1447298). Fixes bug 31027; bugfix + on 0.4.1.1-alpha. + + +Changes in version 0.4.1.3-alpha - 2019-06-25 + Tor 0.4.1.3-alpha resolves numerous bugs left over from the previous + alpha, most of them from earlier release series. + + o Major bugfixes (Onion service reachability): + - Properly clean up the introduction point map when circuits change + purpose from onion service circuits to pathbias, measurement, or + other circuit types. This should fix some service-side instances + of introduction point failure. Fixes bug 29034; bugfix + on 0.3.2.1-alpha. + + o Minor features (geoip): + - Update geoip and geoip6 to the June 10 2019 Maxmind GeoLite2 + Country database. Closes ticket 30852. + + o Minor features (logging): + - Give a more useful assertion failure message if we think we have + minherit() but we fail to make a region non-inheritable. Give a + compile-time warning if our support for minherit() is incomplete. + Closes ticket 30686. + + o Minor bugfixes (circuit isolation): + - Fix a logic error that prevented the SessionGroup sub-option from + being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha. + + o Minor bugfixes (continuous integration): + - Allow the test-stem job to fail in Travis, because it sometimes + hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha. + - Skip test_rebind on macOS in Travis, because it is unreliable on + macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha. + - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment + variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha. + + o Minor bugfixes (directory authorities): + - Stop crashing after parsing an unknown descriptor purpose + annotation. We think this bug can only be triggered by modifying a + local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha. + + o Minor bugfixes (pluggable transports): + - When running as a bridge with pluggable transports, always publish + pluggable transport information in our extrainfo descriptor, even + if ExtraInfoStatistics is 0. This information is needed by + BridgeDB. Fixes bug 30956; bugfix on 0.4.1.1-alpha. + + o Documentation: + - Mention URLs for Travis/Appveyor/Jenkins in ReleasingTor.md. + Closes ticket 30630. + + +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 option.) 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 0.2.4.1-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 0.1.0.1-rc. 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 + 0.2.3.1-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 @@ -2580,7 +7625,7 @@ Changes in version 0.3.4.1-alpha - 2018-05-17 - Remove duplicate code in parse_{c,s}method_line and bootstrap their functionalities into a single function. Fixes bug 6236; bugfix on 0.2.3.6-alpha. - - We remove the PortForwsrding and PortForwardingHelper options, + - We remove the PortForwarding and PortForwardingHelper options, related functions, and the port_forwarding tests. These options were used by the now-deprecated Vidalia to help ordinary users become Tor relays or bridges. Closes ticket 25409. Patch by @@ -9182,7 +14227,7 @@ Changes in version 0.2.9.3-alpha - 2016-09-23 HiddenServiceNonAnonymousMode options. When both are set to 1, every hidden service on a Tor instance becomes a non-anonymous Single Onion Service. Single Onions make one-hop (direct) - connections to their introduction and renzedvous points. One-hop + connections to their introduction and rendezvous points. One-hop circuits make Single Onion servers easily locatable, but clients remain location-anonymous. This is compatible with the existing hidden service implementation, and works on the current tor @@ -9685,13 +14730,12 @@ Changes in version 0.2.9.1-alpha - 2016-08-08 needless crash bugs. Closes ticket 18613. o Minor features (performance): - - Changer the "optimistic data" extension from "off by default" to + - Change the "optimistic data" extension from "off by default" to "on by default". The default was ordinarily overridden by a consensus option, but when clients were bootstrapping for the first time, they would not have a consensus to get the option - from. Changing this default When fetching a consensus for the - first time, use optimistic data. This saves a round-trip during - startup. Closes ticket 18815. + from. Changing this default saves a round-trip during startup. + Closes ticket 18815. o Minor features (relay, usability): - When the directory authorities refuse a bad relay's descriptor, |