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@@ -1,3 +1,1529 @@ +Changes in version 0.4.4.6 - 2020-11-12 + Tor 0.4.4.6 is the second stable release in the 0.4.4.x series. It + backports fixes from later releases, including a fix for TROVE-2020- + 005, a security issue that could be used, under certain cases, by an + adversary to observe traffic patterns on a limited number of circuits + intended for a different relay. + + o Major bugfixes (security, backport from 0.4.5.1-alpha): + - When completing a channel, relays now check more thoroughly to + make sure that it matches any pending circuits before attaching + those circuits. Previously, address correctness and Ed25519 + identities were not checked in this case, but only when extending + circuits on an existing channel. Fixes bug 40080; bugfix on + 0.2.7.2-alpha. Resolves TROVE-2020-005. + + o Minor features (directory authorities, backport from 0.4.5.1-alpha): + - Authorities now list a different set of protocols as required and + recommended. These lists have been chosen so that only truly + recommended and/or required protocols are included, and so that + clients using 0.2.9 or later will continue to work (even though + they are not supported), whereas only relays running 0.3.5 or + later will meet the requirements. Closes ticket 40162. + - Make it possible to specify multiple ConsensusParams torrc lines. + Now directory authority operators can for example put the main + ConsensusParams config in one torrc file and then add to it from a + different torrc file. Closes ticket 40164. + + o Minor features (subprotocol versions, backport from 0.4.5.1-alpha): + - Tor no longer allows subprotocol versions larger than 63. + Previously version numbers up to UINT32_MAX were allowed, which + significantly complicated our code. Implements proposal 318; + closes ticket 40133. + + o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha): + - Fix a rendezvous cache unit test that was triggering an underflow + on the global rend cache allocation. Fixes bug 40125; bugfix + on 0.2.8.1-alpha. + - Fix another rendezvous cache unit test that was triggering an + underflow on the global rend cache allocation. Fixes bug 40126; + bugfix on 0.2.8.1-alpha. + + o Minor bugfixes (compilation, backport from 0.4.5.1-alpha): + - Fix compiler warnings that would occur when building with + "--enable-all-bugs-are-fatal" and "--disable-module-relay" at the + same time. Fixes bug 40129; bugfix on 0.4.4.1-alpha. + - Resolve a compilation warning that could occur in + test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha. + + o Minor bugfixes (logging, backport from 0.4.5.1-alpha): + - Remove a debug logging statement that uselessly spammed the logs. + Fixes bug 40135; bugfix on 0.3.5.0-alpha. + + o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha): + - Avoid a fatal assert() when failing to create a listener + connection for an address that was in use. Fixes bug 40073; bugfix + on 0.3.5.1-alpha. + + o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha): + - For HSFETCH commands on v2 onion services addresses, check the + length of bytes decoded, not the base32 length. Fixes bug 34400; + bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan. + + +Changes in version 0.4.3.7 - 2020-11-12 + Tor 0.4.3.7 backports several bugfixes from later releases. It + includes a fix for TROVE-2020-005, a security issue that could be + used, under certain cases, by an adversary to observe traffic patterns + on a limited number of circuits intended for a different relay. + + Please be aware that support for the 0.4.3.x series will end on 15 + February 2021. Please upgrade to 0.4.4.x or 0.4.5.x before then, or + downgrade to 0.3.5.x, which will be supported until at least 1 + February 2022. + + o Major features (fallback directory list, backport form 0.4.4.3-alpha): + - Replace the 148 fallback directories originally included in Tor + 0.4.1.4-rc (of which around 105 are still functional) with a list + of 144 fallbacks generated in July 2020. Closes ticket 40061. + + o Major bugfixes (security, backport from 0.4.5.1-alpha): + - When completing a channel, relays now check more thoroughly to + make sure that it matches any pending circuits before attaching + those circuits. Previously, address correctness and Ed25519 + identities were not checked in this case, but only when extending + circuits on an existing channel. Fixes bug 40080; bugfix on + 0.2.7.2-alpha. Resolves TROVE-2020-005. + + o Major bugfixes (NSS, backport from 0.4.4.3-alpha): + - When running with NSS enabled, make sure that NSS knows to expect + nonblocking sockets. Previously, we set our TCP sockets as + nonblocking, but did not tell NSS, which in turn could lead to + unexpected blocking behavior. Fixes bug 40035; bugfix + on 0.3.5.1-alpha. + + o Minor features (security, backport from 0.4.4.4-rc): + - Channels using obsolete versions of the Tor link protocol are no + longer allowed to circumvent address-canonicity checks. (This is + only a minor issue, since such channels have no way to set ed25519 + keys, and therefore should always be rejected for circuits that + specify ed25519 identities.) Closes ticket 40081. + + o Minor features (subprotocol versions, backport from 0.4.5.1-alpha): + - Tor no longer allows subprotocol versions larger than 63. + Previously version numbers up to UINT32_MAX were allowed, which + significantly complicated our code. Implements proposal 318; + closes ticket 40133. + + o Minor features (tests, backport from 0.4.4.5): + - Our "make check" target now runs the unit tests in 8 parallel + chunks. Doing this speeds up hardened CI builds by more than a + factor of two. Closes ticket 40098. + + o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha): + - Fix a rendezvous cache unit test that was triggering an underflow + on the global rend cache allocation. Fixes bug 40125; bugfix + on 0.2.8.1-alpha. + - Fix another rendezvous cache unit test that was triggering an + underflow on the global rend cache allocation. Fixes bug 40126; + bugfix on 0.2.8.1-alpha. + + o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc): + - Fix a correctness bug that could cause an assertion failure if we + ever tried using the buf_move_all() function with an empty input + buffer. As far as we know, no released versions of Tor do this. + Fixes bug 40076; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (logging, backport from 0.4.5.1-alpha): + - Remove a debug logging statement that uselessly spammed the logs. + Fixes bug 40135; bugfix on 0.3.5.0-alpha. + + o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc): + - On a bridge, treat all connections from an ExtORPort as remote by + default for the purposes of rate-limiting. Previously, bridges + would treat the connection as local unless they explicitly + received a "USERADDR" command. ExtORPort connections still count + as local if there is a USERADDR command with an explicit local + address. Fixes bug 33747; bugfix on 0.2.5.1-alpha. + + o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha): + - Avoid a fatal assert() when failing to create a listener + connection for an address that was in use. Fixes bug 40073; bugfix + on 0.3.5.1-alpha. + + o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha): + - Adjust the rules for when to warn about having too many + connections to other relays. Previously we'd tolerate up to 1.5 + connections per relay on average. Now we tolerate more connections + for directory authorities, and raise the number of total + connections we need to see before we warn. Fixes bug 33880; bugfix + on 0.3.1.1-alpha. + + o Minor bugfixes (tests, 0.4.4.5): + - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run + on its own. Previously, it would exit with an error. Fixes bug + 40099; bugfix on 0.2.8.1-alpha. + + o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha): + - For HSFETCH commands on v2 onion services addresses, check the + length of bytes decoded, not the base32 length. Fixes bug 34400; + bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan. + + o Minor bugfixes (windows, backport from 0.4.4.4-rc): + - Fix a bug that prevented Tor from starting if its log file grew + above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha. + + o Deprecated features (onion service v2, backport form 0.4.4.2-alpha): + - Add a deprecation warning for version 2 onion services. Closes + ticket 40003. + + o Removed features (backport from 0.4.4.3-alpha): + - Our "check-local" test target no longer tries to use the + Coccinelle semantic patching tool parse all the C files. While it + is a good idea to try to make sure Coccinelle works on our C + before we run a Coccinelle patch, doing so on every test run has + proven to be disruptive. You can still run this tool manually with + "make check-cocci". Closes ticket 40030. ticket 40030. + + +Changes in version 0.3.5.12 - 2020-11-12 + Tor 0.4.3.7 backports several bugfixes from later releases. It + includes a fix for TROVE-2020-005, a security issue that could be + used, under certain cases, by an adversary to observe traffic patterns + on a limited number of circuits intended for a different relay. + + o Major features (fallback directory list, backport form 0.4.4.3-alpha): + - Replace the 148 fallback directories originally included in Tor + 0.4.1.4-rc (of which around 105 are still functional) with a list + of 144 fallbacks generated in July 2020. Closes ticket 40061. + + o Major bugfixes (security, backport from 0.4.5.1-alpha): + - When completing a channel, relays now check more thoroughly to + make sure that it matches any pending circuits before attaching + those circuits. Previously, address correctness and Ed25519 + identities were not checked in this case, but only when extending + circuits on an existing channel. Fixes bug 40080; bugfix on + 0.2.7.2-alpha. Resolves TROVE-2020-005. + + o Major bugfixes (NSS, backport from 0.4.4.3-alpha): + - When running with NSS enabled, make sure that NSS knows to expect + nonblocking sockets. Previously, we set our TCP sockets as + nonblocking, but did not tell NSS, which in turn could lead to + unexpected blocking behavior. Fixes bug 40035; bugfix + on 0.3.5.1-alpha. + + o Minor features (security, backport from 0.4.4.4-rc): + - Channels using obsolete versions of the Tor link protocol are no + longer allowed to circumvent address-canonicity checks. (This is + only a minor issue, since such channels have no way to set ed25519 + keys, and therefore should always be rejected for circuits that + specify ed25519 identities.) Closes ticket 40081. + + 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 (subprotocol versions, backport from 0.4.5.1-alpha): + - Tor no longer allows subprotocol versions larger than 63. + Previously version numbers up to UINT32_MAX were allowed, which + significantly complicated our code. Implements proposal 318; + closes ticket 40133. + + o Minor features (tests, backport from 0.4.4.5): + - Our "make check" target now runs the unit tests in 8 parallel + chunks. Doing this speeds up hardened CI builds by more than a + factor of two. Closes ticket 40098. + + o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha): + - Fix a rendezvous cache unit test that was triggering an underflow + on the global rend cache allocation. Fixes bug 40125; bugfix + on 0.2.8.1-alpha. + - Fix another rendezvous cache unit test that was triggering an + underflow on the global rend cache allocation. Fixes bug 40126; + bugfix on 0.2.8.1-alpha. + + o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc): + - Fix a correctness bug that could cause an assertion failure if we + ever tried using the buf_move_all() function with an empty input + buffer. As far as we know, no released versions of Tor do this. + Fixes bug 40076; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (logging, backport from 0.4.5.1-alpha): + - Remove a debug logging statement that uselessly spammed the logs. + Fixes bug 40135; bugfix on 0.3.5.0-alpha. + + o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc): + - On a bridge, treat all connections from an ExtORPort as remote by + default for the purposes of rate-limiting. Previously, bridges + would treat the connection as local unless they explicitly + received a "USERADDR" command. ExtORPort connections still count + as local if there is a USERADDR command with an explicit local + address. Fixes bug 33747; bugfix on 0.2.5.1-alpha. + + o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha): + - Avoid a fatal assert() when failing to create a listener + connection for an address that was in use. Fixes bug 40073; bugfix + on 0.3.5.1-alpha. + + o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha): + - Adjust the rules for when to warn about having too many + connections to other relays. Previously we'd tolerate up to 1.5 + connections per relay on average. Now we tolerate more connections + for directory authorities, and raise the number of total + connections we need to see before we warn. Fixes bug 33880; bugfix + on 0.3.1.1-alpha. + + o Minor bugfixes (relays, backport from 0.4.4.1-alpha): + - Stop advertising incorrect IPv6 ORPorts in relay and bridge + descriptors, when the IPv6 port was configured as "auto". Fixes + bug 32588; bugfix on 0.2.3.9-alpha. + + o Minor bugfixes (tests, 0.4.4.5): + - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run + on its own. Previously, it would exit with an error. Fixes bug + 40099; bugfix on 0.2.8.1-alpha. + + o Minor bugfixes (windows, backport from 0.4.4.4-rc): + - Fix a bug that prevented Tor from starting if its log file grew + above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha. + + o Deprecated features (onion service v2, backport form 0.4.4.2-alpha): + - Add a deprecation warning for version 2 onion services. Closes + ticket 40003. + + +Changes in version 0.4.5.1-alpha - 2020-11-01 + Tor 0.4.5.1-alpha is the first alpha release in the 0.4.5.x series. It + improves support for IPv6, address discovery and self-testing, code + metrics and tracing. + + This release also fixes TROVE-2020-005, a security issue that could be + used, under certain cases, by an adversary to observe traffic patterns + on a limited number of circuits intended for a different relay. To + mount this attack, the adversary would need to actively extend + circuits to an incorrect address, as well as compromise a relay's + legacy RSA-1024 key. We'll be backporting this fix to other release + series soon, after it has had some testing. + + Here are the changes since 0.4.4.5. + + o Major features (build): + - When building Tor, first link all object files into a single + static library. This may help with embedding Tor in other + programs. Note that most Tor functions do not constitute a part of + a stable or supported API: only those functions in tor_api.h + should be used if embedding Tor. Closes ticket 40127. + + o Major features (metrics): + - Introduce a new MetricsPort which exposes, through an HTTP + interface, a series of metrics that tor collects at runtime. At + the moment, the only supported output format is Prometheus data + model. Closes ticket 40063. See the manual page for more + information and security considerations. + o Major features (relay, IPv6): + - The torrc option Address now supports IPv6. This unifies our + address discovery interface to support IPv4, IPv6, and hostnames. + Closes ticket 33233. + - Launch IPv4 and IPv6 ORPort self-test circuits on relays and + bridges. Closes ticket 33222. + - Relays now automatically bind on IPv6 for their ORPort, unless + specified otherwise with the IPv4Only flag. Closes ticket 33246. + - When a relay with IPv6 support is told to open a connection to + another relay, and the extend cell lists both IPv4 and IPv6 + addresses, the first relay now picks randomly which address to + use. Closes ticket 33220. + - Relays now track their IPv6 ORPort reachability separately from + the reachability of their IPv4 ORPort. They will not publish a + descriptor unless _both_ ports appear to be externally reachable. + Closes ticket 34067. + + o Major features (tracing): + - Add event-tracing library support for USDT and LTTng-UST, and a + few tracepoints in the circuit subsystem. More will come + incrementally. This feature is compiled out by default: it needs + to be enabled at configure time. See documentation in + doc/HACKING/Tracing.md. Closes ticket 32910. + + o Major bugfixes (security): + - When completing a channel, relays now check more thoroughly to + make sure that it matches any pending circuits before attaching + those circuits. Previously, address correctness and Ed25519 + identities were not checked in this case, but only when extending + circuits on an existing channel. Fixes bug 40080; bugfix on + 0.2.7.2-alpha. Resolves TROVE-2020-005. + + o Major bugfixes (TLS, buffer): + - When attempting to read N bytes on a TLS connection, really try to + read all N bytes. Previously, Tor would stop reading after the + first TLS record, which can be smaller than the N bytes requested, + and not check for more data until the next mainloop event. Fixes + bug 40006; bugfix on 0.1.0.5-rc. + + o Minor features (address discovery): + - If no Address statements are found, relays now prioritize guessing + their address by looking at the local interface instead of the + local hostname. If the interface address can't be found, the local + hostname is used. Closes ticket 33238. + + o Minor features (admin tools): + - Add a new --format argument to -key-expiration option to allow + specifying the time format of the expiration date. Adds Unix + timestamp format support. Patch by Daniel Pinto. Closes + ticket 30045. + + o Minor features (bootstrap reporting): + - When reporting bootstrapping status on a relay, do not consider + connections that have never been the target of an origin circuit. + Previously, all connection failures were treated as potential + bootstrapping failures, including connections that had been opened + because of client requests. Closes ticket 25061. + + o Minor features (build): + - When running the configure script, try to detect version + mismatches between the OpenSSL headers and libraries, and suggest + that the user should try "--with-openssl-dir". Closes 40138. + - If the configure script has given any warnings, remind the user + about them at the end of the script. Related to 40138. + + o Minor features (configuration): + - Allow using wildcards (* and ?) with the %include option on + configuration files. Closes ticket 25140. Patch by Daniel Pinto. + - Allow the configuration options EntryNodes, ExcludeNodes, + ExcludeExitNodes, ExitNodes, MiddleNodes, HSLayer2Nodes and + HSLayer3Nodes to be specified multiple times. Closes ticket 28361. + Patch by Daniel Pinto. + + o Minor features (control port): + - Add a DROPTIMEOUTS command to drop circuit build timeout history + and reset the current timeout. Closes ticket 40002. + - When a stream enters the AP_CONN_STATE_CONTROLLER_WAIT status, + send a control port event. Closes ticket 32190. Patch by + Neel Chauhan. + - Introduce GETINFO "stats/ntor/{assigned/requested}" and + "stats/tap/{assigned/requested}" to get the NTor and TAP circuit + onion handshake counts respectively. Closes ticket 28279. Patch by + Neel Chauhan. + + o Minor features (control port, IPv6): + - Tor relays now try to report to the controller when they are + launching an IPv6 self-test. Closes ticket 34068. + - Introduce "GETINFO address/v4" and "GETINFO address/v6" in the + control port to fetch the Tor host's respective IPv4 or IPv6 + address. We keep "GETINFO address" for backwards-compatibility. + Closes ticket 40039. Patch by Neel Chauhan. + + o Minor features (directory authorities): + - Authorities now list a different set of protocols as required and + recommended. These lists have been chosen so that only truly + recommended and/or required protocols are included, and so that + clients using 0.2.9 or later will continue to work (even though + they are not supported), whereas only relays running 0.3.5 or + later will meet the requirements. Closes ticket 40162. + - Add a new consensus method 30 that removes the unnecessary "=" + padding from ntor-onion-key. Closes ticket 7869. Patch by + Daniel Pinto. + - Directory authorities now reject descriptors from relays running + Tor versions from the obsolete 0.4.1 series. Resolves ticket + 34357. Patch by Neel Chauhan. + - Make it possible to specify multiple ConsensusParams torrc lines. + Now directory authority operators can for example put the main + ConsensusParams config in one torrc file and then add to it from a + different torrc file. Closes ticket 40164. + - The AssumeReachable option no longer stops directory authorities + from checking whether other relays are running. A new + AuthDirTestReachability option can be used to disable these + checks. Closes ticket 34445. + - When looking for possible Sybil attacks, also consider IPv6 + addresses. Two routers are considered to have "the same" address + by this metric if they are in the same /64 network. Patch from + Maurice Pibouin. Closes ticket 7193. + + o Minor features (directory authorities, IPv6): + - Make authorities add their IPv6 ORPort (if any) to the trusted + servers list. Authorities previously added only their IPv4 + addresses. Closes ticket 32822. + + o Minor features (ed25519, relay): + - Save a relay's base64-encoded ed25519 identity key to the data + directory in a file named fingerprint-ed25519. Closes ticket + 30642. Patch by Neel Chauhan. + + o Minor features (heartbeat): + - Include the total number of inbound and outbound IPv4 and IPv6 + connections in the heartbeat message. Closes ticket 29113. + + o Minor features (IPv6, ExcludeNodes): + - Handle IPv6 addresses in ExcludeNodes; previously they were + ignored. Closes ticket 34065. Patch by Neel Chauhan. + + o Minor features (logging): + - Add the running glibc version to the log, and the compiled glibc + version to the library list returned when using --library-versions. + Patch from Daniel Pinto. Closes ticket 40047. + - Consider an HTTP 301 response to be an error (like a 404) when + processing a directory response. Closes ticket 40053. + - Log directory fetch statistics as a single line. Closes + ticket 40159. + - Provide more complete descriptions of our connections when logging + about them. Closes ticket 40041. + - When describing a relay in the logs, we now include its ed25519 + identity. Closes ticket 22668. + + o Minor features (onion services): + - Only overwrite an onion service's existing hostname file if its + contents are wrong. This enables read-only onion-service + directories. Resolves ticket 40062. Patch by Neel Chauhan. + + o Minor features (pluggable transports): + - Add an OutboundBindAddressPT option to allow users to specify + which IPv4 and IPv6 address pluggable transports should use for + outgoing IP packets. Tor does not have a way to enforce that the + pluggable transport honors this option, so each pluggable transport + needs to implement support on its own. Closes ticket 5304. + + o Minor features (relay address tracking): + - We now store relay addresses for OR connections in a more logical + way. Previously we would sometimes overwrite the actual address of + a connection with a "canonical address", and then store the "real + address" elsewhere to remember it. We now track the "canonical + address" elsewhere for the cases where we need it, and leave the + connection's address alone. Closes ticket 33898. + + o Minor features (relay): + - If a relay is unable to discover its address, attempt to learn it + from the NETINFO cell. Closes ticket 40022. + - Log immediately when launching a relay self-check. Previously we + would try to log before launching checks, or approximately when we + intended to launch checks, but this tended to be error-prone. + Closes ticket 34137. + + o Minor features (relay, address discovery): + - If Address option is not found in torrc, attempt to learn our + address with the configured ORPort address if any. Closes + ticket 33236. + + o Minor features (relay, IPv6): + - Add an AssumeReachableIPv6 option to disable self-checking IPv6 + reachability. Closes part of ticket 33224. + - Add new "assume-reachable" and "assume-reachable-ipv6" consensus + parameters to be used in an emergency to tell relays that they + should publish even if they cannot complete their ORPort self- + checks. Closes ticket 34064 and part of 33224. + - Allow relays to send IPv6-only extend cells. Closes ticket 33222. + - Declare support for the Relay=3 subprotocol version. Closes + ticket 33226. + - When launching IPv6 ORPort self-test circuits, make sure that the + second-last hop can initiate an IPv6 extend. Closes ticket 33222. + + o Minor features (specification update): + - Several fields in microdescriptors, router descriptors, and + consensus documents that were formerly optional are now required. + Implements proposal 315; closes ticket 40132. + + o Minor features (state management): + - When loading the state file, remove entries from the statefile + that have been obsolete for a long time. Ordinarily Tor preserves + unrecognized entries in order to keep forward-compatibility, but + these entries have not actually been used in any release since + before 0.3.5.x. Closes ticket 40137. + + o Minor features (statistics, ipv6): + - Relays now publish IPv6-specific counts of single-direction versus + bidirectional relay connections. Closes ticket 33264. + - Relays now publish their IPv6 read and write statistics over time, + if statistics are enabled. Closes ticket 33263. + + o Minor features (subprotocol versions): + - Tor no longer allows subprotocol versions larger than 63. + Previously version numbers up to UINT32_MAX were allowed, which + significantly complicated our code. Implements proposal 318; + closes ticket 40133. + - Use the new limitations on subprotocol versions due to proposal + 318 to simplify our implementation. Part of ticket 40133. + + o Minor features (testing configuration): + - The TestingTorNetwork option no longer implicitly sets + AssumeReachable to 1. This change allows us to test relays' self- + testing mechanisms, and to test authorities' relay-testing + functionality. Closes ticket 34446. + + o Minor features (testing): + - Added unit tests for channel_matches_target_addr_for_extend(). + Closes Ticket 33919. Patch by MrSquanchee. + + o Minor features (tests, v2 onion services): + - Fix a rendezvous cache unit test that was triggering an underflow + on the global rend cache allocation. Fixes bug 40125; bugfix + on 0.2.8.1-alpha. + - Fix another rendezvous cache unit test that was triggering an + underflow on the global rend cache allocation. Fixes bug 40126; + bugfix on 0.2.8.1-alpha. + + o Minor bugfixes (circuit padding): + - When circpad_send_padding_cell_for_callback is called, + `is_padding_timer_scheduled` flag was not reset. Now it is set to + 0 at the top of that function. Fixes bug 32671; bugfix + on 0.4.0.1-alpha. + - Add a per-circuit padding machine instance counter, so we can + differentiate between shutdown requests for old machines on a + circuit. Fixes bug 30992; bugfix on 0.4.1.1-alpha. + - Add the ability to keep circuit padding machines if they match a + set of circuit states or purposes. This allows us to have machines + that start up under some conditions but don't shut down under + others. We now use this mask to avoid starting up introduction + circuit padding again after the machines have already completed. + Fixes bug 32040; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (compatibility): + - Strip '\r' characters when reading text files on Unix platforms. + This should resolve an issue where a relay operator migrates a + relay from Windows to Unix, but does not change the line ending of + Tor's various state files to match the platform, and the CRLF line + endings from Windows end up leaking into other files such as the + extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5. + + o Minor bugfixes (compilation): + - Fix compiler warnings that would occur when building with + "--enable-all-bugs-are-fatal" and "--disable-module-relay" at the + same time. Fixes bug 40129; bugfix on 0.4.4.1-alpha. + - Resolve a compilation warning that could occur in + test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha. + + o Minor bugfixes (configuration): + - Fix bug where %including a pattern ending with */ would include + files and folders (instead of folders only) in versions of glibc < + 2.19. Fixes bug 40141; bugfix on 0.4.5.0-alpha-dev. Patch by + Daniel Pinto. + + o Minor bugfixes (control port): + - Make sure we send the SOCKS request address in relay begin cells + when a stream is attached with the purpose + CIRCUIT_PURPOSE_CONTROLLER. Fixes bug 33124; bugfix on 0.0.5. + Patch by Neel Chauhan. + + o Minor bugfixes (logging): + - Remove a debug logging statement that uselessly spammed the logs. + Fixes bug 40135; bugfix on 0.3.5.0-alpha. + - When logging a rate-limited message about how many messages have + been suppressed in the last N seconds, give an accurate value for + N, rounded up to the nearest minute. Previously we would report + the size of the rate-limiting interval, regardless of when the + messages started to occur. Fixes bug 19431; bugfix + on 0.2.2.16-alpha. + + o Minor bugfixes (relay configuration, crash): + - Avoid a fatal assert() when failing to create a listener + connection for an address that was in use. Fixes bug 40073; bugfix + on 0.3.5.1-alpha. + + o Minor bugfixes (rust, protocol versions): + - Declare support for the onion service introduction point denial of + service extensions when building with Rust. Fixes bug 34248; + bugfix on 0.4.2.1-alpha. + - Make Rust protocol version support checks consistent with the + undocumented error behavior of the corresponding C code. Fixes bug + 34251; bugfix on 0.3.3.5-rc. + + o Minor bugfixes (self-testing): + - When receiving an incoming circuit, only accept it as evidence + that we are reachable if the declared address of its channel is + the same address we think that we have. Otherwise, it could be + evidence that we're reachable on some other address. Fixes bug + 20165; bugfix on 0.1.0.1-rc. + + o Minor bugfixes (spec conformance): + - Use the correct key type when generating signing->link + certificates. Fixes bug 40124; bugfix on 0.2.7.2-alpha. + + o Minor bugfixes (subprotocol versions): + - Consistently reject extra commas, instead of only rejecting + leading commas. Fixes bug 27194; bugfix on 0.2.9.4-alpha. + - In summarize_protover_flags(), treat empty strings the same as + NULL. This prevents protocols_known from being set. Previously, we + treated empty strings as normal strings, which led to + protocols_known being set. Fixes bug 34232; bugfix on + 0.3.3.2-alpha. Patch by Neel Chauhan. + + o Minor bugfixes (v2 onion services): + - For HSFETCH commands on v2 onion services addresses, check the + length of bytes decoded, not the base32 length. Fixes bug 34400; + bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan. + + o Code simplification and refactoring: + - Add and use a set of functions to perform down-casts on constant + connection and channel pointers. Closes ticket 40046. + - Refactor our code that logs descriptions of connections, channels, + and the peers on them, to use a single call path. This change + enables us to refactor the data types that they use, and eliminates + many confusing usages of those types. Closes ticket 40041. + - Refactor some common node selection code into a single function. + Closes ticket 34200. + - Remove the now-redundant 'outbuf_flushlen' field from our + connection type. It was previously used for an older version of + our rate-limiting logic. Closes ticket 33097. + - Rename "fascist_firewall_*" identifiers to "reachable_addr_*" + instead, for consistency with other code. Closes ticket 18106. + - Rename functions about "advertised" ports which are not in fact + guaranteed to return the ports that have been advertised. Closes + ticket 40055. + - Split implementation of several command line options from + options_init_from_torrc into smaller isolated functions. Patch by + Daniel Pinto. Closes ticket 40102. + - When an extend cell is missing an IPv4 or IPv6 address, fill in + the address from the extend info. This is similar to what was done + in ticket 33633 for ed25519 keys. Closes ticket 33816. Patch by + Neel Chauhan. + + o Deprecated features: + - The "non-builtin" argument to the "--dump-config" command is now + deprecated. When it works, it behaves the same as "short", which + you should use instead. Closes ticket 33398. + + o Documentation: + - Replace URLs from our old bugtracker so that they refer to the new + bugtracker and wiki. Closes ticket 40101. + + o Removed features: + - We no longer ship or build a "tor.service" file for use with + systemd. No distribution included this script unmodified, and we + don't have the expertise ourselves to maintain this in a way that + all the various systemd-based distributions can use. Closes + ticket 30797. + - We no longer ship support for the Android logging API. Modern + versions of Android can use the syslog API instead. Closes + ticket 32181. + - The "optimistic data" feature is now always on; there is no longer + an option to disable it from the torrc file or from the consensus + directory. Closes part of 40139. + - The "usecreatefast" network parameter is now removed; there is no + longer an option for authorities to turn it off. Closes part + of 40139. + + o Testing: + - Add unit tests for bandwidth statistics manipulation functions. + Closes ticket 33812. Patch by MrSquanchee. + + o Code simplification and refactoring (autoconf): + - Remove autoconf checks for unused funcs and headers. Closes ticket + 31699; Patch by @bduszel + + o Code simplification and refactoring (maintainer scripts): + - Disable by default the pre-commit hook. Use the environment + variable TOR_EXTRA_PRE_COMMIT_CHECKS in order to run it. + Furthermore, stop running practracker in the pre-commit hook and + make check-local. Closes ticket 40019. + + o Code simplification and refactoring (relay address): + - Most of IPv4 representation was using "uint32_t". It has now been + moved to use the internal "tor_addr_t" interface instead. This is + so we can properly integrate IPv6 along IPv4 with common + interfaces. Closes ticket 40043. + + o Documentation (manual page): + - Move them from doc/ to doc/man/. Closes ticket 40044. + - Describe the status of the "Sandbox" option more accurately. It is + no longer "experimental", but it _is_ dependent on kernel and libc + versions. Closes ticket 23378. + + o Documentation (tracing): + - Document in depth the circuit subsystem trace events in the new + doc/tracing/EventsCircuit.md. Closes ticket 40036. + + +Changes in version 0.4.4.5 - 2020-09-15 + Tor 0.4.4.5 is the first stable release in the 0.4.4.x series. This + series improves our guard selection algorithms, adds v3 onion balance + support, improves the amount of code that can be disabled when running + without relay support, and includes numerous small bugfixes and + enhancements. It also lays the ground for some IPv6 features that + we'll be developing more in the next (0.4.5) series. + + 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 0.4.4.x will be supported until around June 2021--or later, if + 0.4.5.x is later than anticipated. + + Note also that support for 0.4.2.x has just ended; support for 0.4.3 + will continue until Feb 15, 2021. We still plan to continue supporting + 0.3.5.x, our long-term stable series, until Feb 2022. + + Below are the changes since 0.4.4.4-rc. For a complete list of changes + since 0.4.3.6, see the ReleaseNotes file. + + o Major bugfixes (onion services, DoS): + - Correct handling of parameters for the onion service DoS defense. + Previously, the consensus parameters for the onion service DoS + defenses were overwriting the parameters set by the service + operator using HiddenServiceEnableIntroDoSDefense. Fixes bug + 40109; bugfix on 0.4.2.1-alpha. + + o Major bugfixes (stats, onion services): + - Fix a bug where we were undercounting the Tor network's total + onion service traffic, by ignoring any traffic originating from + clients. Now we count traffic from both clients and services. + Fixes bug 40117; bugfix on 0.2.6.2-alpha. + + o Minor features (control port): + - If a ClientName was specified in ONION_CLIENT_AUTH_ADD for an + onion service, display it when we use ONION_CLIENT_AUTH_VIEW. + Closes ticket 40089. Patch by Neel Chauhan. + + o Minor features (denial-of-service memory limiter): + - Allow the user to configure even lower values for the + MaxMemInQueues parameter. Relays now enforce a minimum of 64 MB, + when previously the minimum was 256 MB. On clients, there is no + minimum. Relays and clients will both warn if the value is set so + low that Tor is likely to stop working. Closes ticket 24308. + + o Minor features (tests): + - Our "make check" target now runs the unit tests in 8 parallel + chunks. Doing this speeds up hardened CI builds by more than a + factor of two. Closes ticket 40098. + + o Minor bugfixes (guard selection algorithm): + - Avoid needless guard-related warning when upgrading from 0.4.3 to + 0.4.4. Fixes bug 40105; bugfix on 0.4.4.1-alpha. + + o Minor bugfixes (tests): + - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run + on its own. Previously, it would exit with an error. Fixes bug + 40099; bugfix on 0.2.8.1-alpha. + + +Changes in version 0.4.4.3-alpha - 2020-07-27 + Tor 0.4.4.3-alpha fixes several annoyances in previous versions, + including one affecting NSS users, and several affecting the Linux + seccomp2 sandbox. + + o Major features (fallback directory list): + - Replace the 148 fallback directories originally included in Tor + 0.4.1.4-rc (of which around 105 are still functional) with a list + of 144 fallbacks generated in July 2020. Closes ticket 40061. + + o Major bugfixes (NSS): + - When running with NSS enabled, make sure that NSS knows to expect + nonblocking sockets. Previously, we set our TCP sockets as + nonblocking, but did not tell NSS, which in turn could lead to + unexpected blocking behavior. Fixes bug 40035; bugfix + on 0.3.5.1-alpha. + + o Minor bugfixes (linux seccomp2 sandbox): + - Fix a regression on sandboxing rules for the openat() syscall. The + fix for bug 25440 fixed the problem on systems with glibc >= 2.27 + but broke with versions of glibc. We now choose a rule based on + the glibc version. Patch from Daniel Pinto. Fixes bug 27315; + bugfix on 0.3.5.11. + - Makes the seccomp sandbox allow the correct syscall for opendir + according to the running glibc version. This fixes crashes when + reloading torrc with sandbox enabled when running on glibc 2.15 to + 2.21 and 2.26. Patch from Daniel Pinto. Fixes bug 40020; bugfix + on 0.3.5.11. + + o Minor bugfixes (relay, usability): + - Adjust the rules for when to warn about having too many + connections to other relays. Previously we'd tolerate up to 1.5 + connections per relay on average. Now we tolerate more connections + for directory authorities, and raise the number of total + connections we need to see before we warn. Fixes bug 33880; bugfix + on 0.3.1.1-alpha. + + o Documentation: + - Replace most http:// URLs in our code and documentation with + https:// URLs. (We have left unchanged the code in src/ext/, and + the text in LICENSE.) Closes ticket 31812. Patch from Jeremy Rand. + + o Removed features: + - Our "check-local" test target no longer tries to use the + Coccinelle semantic patching tool parse all the C files. While it + is a good idea to try to make sure Coccinelle works on our C + before we run a Coccinelle patch, doing so on every test run has + proven to be disruptive. You can still run this tool manually with + "make check-cocci". Closes ticket 40030. + + +Changes in version 0.3.5.11 - 2020-07-09 + Tor 0.3.5.11 backports fixes from later tor releases, including several + usability, portability, and reliability fixes. + + This release also fixes TROVE-2020-001, a medium-severity denial of + service vulnerability affecting all versions of Tor when compiled with + the NSS encryption library. (This is not the default configuration.) + Using this vulnerability, an attacker could cause an affected Tor + instance to crash remotely. This issue is also tracked as CVE-2020- + 15572. Anybody running a version of Tor built with the NSS library + should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha + or later. + + o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha): + - Fix a crash due to an out-of-bound memory access when Tor is + compiled with NSS support. Fixes bug 33119; bugfix on + 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001 + and CVE-2020-15572. + + o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc): + - 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 features (testing, backport from 0.4.3.4-rc): + - 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 bugfix (CI, Windows, backport from 0.4.4.2-alpha): + - Use the correct 64-bit printf format when compiling with MINGW on + Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha. + + o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha): + - 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 (client performance, backport from 0.4.4.1-alpha): + - Resume use of preemptively-built circuits when UseEntryGuards is set + to 0. We accidentally disabled this feature with that config + setting, leading to slower load times. Fixes bug 34303; bugfix + on 0.3.3.2-alpha. + + o Minor bugfixes (compiler compatibility, backport from 0.4.3.5): + - 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. + + o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha): + - Fix a compiler warning on platforms with 32-bit time_t values. + Fixes bug 40028; bugfix on 0.3.2.8-rc. + + o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha): + - 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 (key portability, backport from 0.4.3.4-rc): + - 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, backport from 0.4.4.2-alpha): + - Downgrade a noisy log message that could occur naturally when + receiving an extrainfo document that we no longer want. Fixes bug + 16016; bugfix on 0.2.6.3-alpha. + + o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha): + - 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 Testing (CI, backport from 0.4.3.4-rc): + - 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 0.4.2.8 - 2020-07-09 + Tor 0.4.2.8 backports various fixes from later releases, including + several that affect usability and portability. + + This release also fixes TROVE-2020-001, a medium-severity denial of + service vulnerability affecting all versions of Tor when compiled with + the NSS encryption library. (This is not the default configuration.) + Using this vulnerability, an attacker could cause an affected Tor + instance to crash remotely. This issue is also tracked as CVE-2020- + 15572. Anybody running a version of Tor built with the NSS library + should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha + or later. + + o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha): + - Fix a crash due to an out-of-bound memory access when Tor is + compiled with NSS support. Fixes bug 33119; bugfix on + 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001 + and CVE-2020-15572. + + o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc): + - 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, backport form 0.4.3.4-rc): + - 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 (diagnostic, backport from 0.4.3.3-alpha): + - 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 (testing, backport from 0.4.3.4-rc): + - 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 bugfix (CI, Windows, backport from 0.4.4.2-alpha): + - Use the correct 64-bit printf format when compiling with MINGW on + Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha. + + o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha): + - 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 (client performance, backport from 0.4.4.1-alpha): + - Resume use of preemptively-built circuits when UseEntryGuards is set + to 0. We accidentally disabled this feature with that config + setting, leading to slower load times. Fixes bug 34303; bugfix + on 0.3.3.2-alpha. + + o Minor bugfixes (compiler compatibility, backport from 0.4.3.5): + - 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 (compiler warnings, backport from 0.4.4.2-alpha): + - Fix a compiler warning on platforms with 32-bit time_t values. + Fixes bug 40028; bugfix on 0.3.2.8-rc. + + o Minor bugfixes (controller protocol, backport from 0.4.3.2-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 (embedded Tor, backport from 0.4.3.1-alpha): + - 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 (key portability, backport from 0.4.3.4-rc): + - 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, backport from 0.4.3.2-rc): + - 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 (logging, backport from 0.4.3.4-rc): + - 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. + + o Minor bugfixes (logging, backport from 0.4.4.2-alpha): + - Downgrade a noisy log message that could occur naturally when + receiving an extrainfo document that we no longer want. Fixes bug + 16016; bugfix on 0.2.6.3-alpha. + + o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha): + - 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 Testing (CI, backport from 0.4.3.4-rc): + - 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 0.4.3.6 - 2020-07-09 + Tor 0.4.3.6 backports several bugfixes from later releases, including + some affecting usability. + + This release also fixes TROVE-2020-001, a medium-severity denial of + service vulnerability affecting all versions of Tor when compiled with + the NSS encryption library. (This is not the default configuration.) + Using this vulnerability, an attacker could cause an affected Tor + instance to crash remotely. This issue is also tracked as CVE-2020- + 15572. Anybody running a version of Tor built with the NSS library + should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha + or later. + + o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha): + - Fix a crash due to an out-of-bound memory access when Tor is + compiled with NSS support. Fixes bug 33119; bugfix on + 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001 + and CVE-2020-15572. + + o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha): + - Use the correct 64-bit printf format when compiling with MINGW on + Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha. + + o Minor bugfixes (client performance, backport from 0.4.4.1-alpha): + - Resume use of preemptively-built circuits when UseEntryGuards is set + to 0. We accidentally disabled this feature with that config + setting, leading to slower load times. Fixes bug 34303; bugfix + on 0.3.3.2-alpha. + + o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha): + - Fix a compiler warning on platforms with 32-bit time_t values. + Fixes bug 40028; bugfix on 0.3.2.8-rc. + + o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha): + - Fix a startup crash when tor is compiled with --enable-nss and + sandbox support is enabled. Fixes bug 34130; bugfix on + 0.3.5.1-alpha. Patch by Daniel Pinto. + + o Minor bugfixes (logging, backport from 0.4.4.2-alpha): + - Downgrade a noisy log message that could occur naturally when + receiving an extrainfo document that we no longer want. Fixes bug + 16016; bugfix on 0.2.6.3-alpha. + + o Minor bugfixes (manual page, backport from 0.4.4.1-alpha): + - Update the man page to reflect that MinUptimeHidServDirectoryV2 + defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha. + + o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha): + - Prevent an assert() that would occur when cleaning the client + descriptor cache, and attempting to close circuits for a non- + decrypted descriptor (lacking client authorization). Fixes bug + 33458; bugfix on 0.4.2.1-alpha. + + o Minor bugfixes (portability, backport from 0.4.4.1-alpha): + - Fix a portability error in the configure script, where we were + using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5. + + o Minor bugfixes (relays, backport from 0.4.4.1-alpha): + - Stop advertising incorrect IPv6 ORPorts in relay and bridge + descriptors, when the IPv6 port was configured as "auto". Fixes + bug 32588; bugfix on 0.2.3.9-alpha. + + o Documentation (backport from 0.4.4.1-alpha): + - Fix several doxygen warnings related to imbalanced groups. Closes + ticket 34255. + + +Changes in version 0.4.4.2-alpha - 2020-07-09 + This is the second alpha release in the 0.4.4.x series. It fixes a few + bugs in the previous release, and solves a few usability, + compatibility, and portability issues. + + This release also fixes TROVE-2020-001, a medium-severity denial of + service vulnerability affecting all versions of Tor when compiled with + the NSS encryption library. (This is not the default configuration.) + Using this vulnerability, an attacker could cause an affected Tor + instance to crash remotely. This issue is also tracked as CVE-2020- + 15572. Anybody running a version of Tor built with the NSS library + should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha + or later. + + o Major bugfixes (NSS, security): + - Fix a crash due to an out-of-bound memory access when Tor is + compiled with NSS support. Fixes bug 33119; bugfix on + 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001 + and CVE-2020-15572. + + o Minor features (bootstrap reporting): + - Report more detailed reasons for bootstrap failure when the + failure happens due to a TLS error. Previously we would just call + these errors "MISC" when they happened during read, and "DONE" + when they happened during any other TLS operation. Closes + ticket 32622. + + o Minor features (directory authority): + - Authorities now recommend the protocol versions that are supported + by Tor 0.3.5 and later. (Earlier versions of Tor have been + deprecated since January of this year.) This recommendation will + cause older clients and relays to give a warning on startup, or + when they download a consensus directory. Closes ticket 32696. + + o Minor features (entry guards): + - Reinstate support for GUARD NEW/UP/DOWN control port events. + Closes ticket 40001. + + o Minor features (linux seccomp2 sandbox, portability): + - Allow Tor to build on platforms where it doesn't know how to + report which syscall caused the linux seccomp2 sandbox to fail. + This change should make the sandbox code more portable to less + common Linux architectures. Closes ticket 34382. + - Permit the unlinkat() syscall, which some Libc implementations use + to implement unlink(). Closes ticket 33346. + + o Minor bugfix (CI, Windows): + - Use the correct 64-bit printf format when compiling with MINGW on + Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha. + + o Minor bugfix (onion service v3 client): + - Remove a BUG() warning that could occur naturally. Fixes bug + 34087; bugfix on 0.3.2.1-alpha. + + o Minor bugfix (SOCKS, onion service client): + - Detect v3 onion service addresses of the wrong length when + returning the F6 ExtendedErrors code. Fixes bug 33873; bugfix + on 0.4.3.1-alpha. + + o Minor bugfixes (compiler warnings): + - Fix a compiler warning on platforms with 32-bit time_t values. + Fixes bug 40028; bugfix on 0.3.2.8-rc. + + o Minor bugfixes (control port, onion service): + - Consistently use 'address' in "Invalid v3 address" response to + ONION_CLIENT_AUTH commands. Previously, we would sometimes say + 'addr'. Fixes bug 40005; bugfix on 0.4.3.1-alpha. + + o Minor bugfixes (logging): + - Downgrade a noisy log message that could occur naturally when + receiving an extrainfo document that we no longer want. Fixes bug + 16016; bugfix on 0.2.6.3-alpha. + + o Minor bugfixes (onion services v3): + - Avoid a non-fatal assertion failure in certain edge-cases when + opening an intro circuit as a client. Fixes bug 34084; bugfix + on 0.3.2.1-alpha. + + o Deprecated features (onion service v2): + - Add a deprecation warning for version 2 onion services. Closes + ticket 40003. + + o Removed features (IPv6, revert): + - Revert the change in the default value of ClientPreferIPv6OrPort: + it breaks the torsocks use case. The SOCKS resolve command has no + mechanism to ask for a specific address family (v4 or v6), and so + prioritizing IPv6 when an IPv4 address is requested on the SOCKS + interface resulted in a failure. Tor Browser explicitly sets + PreferIPv6, so this should not affect the majority of our users. + Closes ticket 33796; bugfix on 0.4.4.1-alpha. + + +Changes in version 0.4.4.1-alpha - 2020-06-16 + This is the first alpha release in the 0.4.4.x series. It improves + our guard selection algorithms, improves the amount of code that + can be disabled when running without relay support, and includes numerous + small bugfixes and enhancements. It also lays the ground for some IPv6 + features that we'll be developing more in the next (0.4.5) series. + + Here are the changes since 0.4.3.5. + + o Major features (Proposal 310, performance + security): + - Implements Proposal 310, "Bandaid on guard selection". Proposal + 310 solves load-balancing issues with older versions of the guard + selection algorithm, and improves its security. Under this new + algorithm, a newly selected guard never becomes Primary unless all + previously sampled guards are unreachable. Implements + recommendation from 32088. (Proposal 310 is linked to the CLAPS + project researching optimal client location-aware path selections. + This project is a collaboration between the UCLouvain Crypto Group, + the U.S. Naval Research Laboratory, and Princeton University.) + + o Major features (IPv6, relay): + - Consider IPv6-only EXTEND2 cells valid on relays. Log a protocol + warning if the IPv4 or IPv6 address is an internal address, and + internal addresses are not allowed. But continue to use the other + address, if it is valid. Closes ticket 33817. + - If a relay can extend over IPv4 and IPv6, and both addresses are + provided, it chooses between them uniformly at random. Closes + ticket 33817. + - Re-use existing IPv6 connections for circuit extends. Closes + ticket 33817. + - Relays may extend circuits over IPv6, if the relay has an IPv6 + ORPort, and the client supplies the other relay's IPv6 ORPort in + the EXTEND2 cell. IPv6 extends will be used by the relay IPv6 + ORPort self-tests in 33222. Closes ticket 33817. + + o Major features (v3 onion services): + - Allow v3 onion services to act as OnionBalance backend instances, + by using the HiddenServiceOnionBalanceInstance torrc option. + Closes ticket 32709. + + o Minor feature (developer tools): + - Add a script to help check the alphabetical ordering of option + names in the manual page. Closes ticket 33339. + + o Minor feature (onion service client, SOCKS5): + - Add 3 new SocksPort ExtendedErrors (F2, F3, F7) that reports back + new type of onion service connection failures. The semantics of + these error codes are documented in proposal 309. Closes + ticket 32542. + + o Minor feature (onion service v3): + - If a service cannot upload its descriptor(s), log why at INFO + level. Closes ticket 33400; bugfix on 0.3.2.1-alpha. + + o Minor feature (python scripts): + - Stop assuming that /usr/bin/python exists. Instead of using a + hardcoded path in scripts that still use Python 2, use + /usr/bin/env, similarly to the scripts that use Python 3. Fixes + bug 33192; bugfix on 0.4.2. + + o Minor features (client-only compilation): + - Disable more code related to the ext_orport protocol when + compiling without support for relay mode. Closes ticket 33368. + - Disable more of our self-testing code when support for relay mode + is disabled. Closes ticket 33370. + + o Minor features (code safety): + - Check for failures of tor_inet_ntop() and tor_inet_ntoa() + functions in DNS and IP address processing code, and adjust + codepaths to make them less likely to crash entire Tor instances. + Resolves issue 33788. + + o Minor features (compilation size): + - Most server-side DNS code is now disabled when building without + support for relay mode. Closes ticket 33366. + + o Minor features (continuous integration): + - Run unit-test and integration test (Stem, Chutney) jobs with + ALL_BUGS_ARE_FATAL macro being enabled on Travis and Appveyor. + Resolves ticket 32143. + + o Minor features (control port): + - Return a descriptive error message from the 'GETINFO status/fresh- + relay-descs' command on the control port. Previously, we returned + a generic error of "Error generating descriptor". Closes ticket + 32873. Patch by Neel Chauhan. + + o Minor features (developer tooling): + - Refrain from listing all .a files that are generated by the Tor + build in .gitignore. Add a single wildcard *.a entry that covers + all of them for present and future. Closes ticket 33642. + - Add a script ("git-install-tools.sh") to install git hooks and + helper scripts. Closes ticket 33451. + + o Minor features (directory authority, shared random): + - Refactor more authority-only parts of the shared-random scheduling + code to reside in the dirauth module, and to be disabled when + compiling with --disable-module-dirauth. Closes ticket 33436. + + o Minor features (directory): + - Remember the number of bytes we have downloaded for each directory + purpose while bootstrapping, and while fully bootstrapped. Log + this information as part of the heartbeat message. Closes + ticket 32720. + + o Minor features (IPv6 support): + - Adds IPv6 support to tor_addr_is_valid(). Adds tests for the above + changes and tor_addr_is_null(). Closes ticket 33679. Patch + by MrSquanchee. + - Allow clients and relays to send dual-stack and IPv6-only EXTEND2 + cells. Parse dual-stack and IPv6-only EXTEND2 cells on relays. + Closes ticket 33901. + + o Minor features (logging): + - When trying to find our own address, add debug-level logging to + report the sources of candidate addresses. Closes ticket 32888. + + o Minor features (testing, architecture): + - Our test scripts now double-check that subsystem initialization + order is consistent with the inter-module dependencies established + by our .may_include files. Implements ticket 31634. + - Initialize all subsystems at the beginning of our unit test + harness, to avoid crashes due to uninitialized subsystems. Follow- + up from ticket 33316. + + o Minor features (v3 onion services): + - Add v3 onion service status to the dumpstats() call which is + triggered by a SIGUSR1 signal. Previously, we only did v2 onion + services. Closes ticket 24844. Patch by Neel Chauhan. + + o Minor features (windows): + - Add support for console control signals like Ctrl+C in Windows. + Closes ticket 34211. Patch from Damon Harris (TheDcoder). + + o Minor bugfix (onion service v3): + - Prevent an assert() that would occur when cleaning the client + descriptor cache, and attempting to close circuits for a non- + decrypted descriptor (lacking client authorization). Fixes bug + 33458; bugfix on 0.4.2.1-alpha. + + o Minor bugfix (refactoring): + - Lift circuit_build_times_disabled() out of the + circuit_expire_building() loop, to save CPU time when there are + many circuits open. Fixes bug 33977; bugfix on 0.3.5.9. + + o Minor bugfixes (client performance): + - Resume use of preemptively-built circuits when UseEntryGuards is set + to 0. We accidentally disabled this feature with that config + setting, leading to slower load times. Fixes bug 34303; bugfix + on 0.3.3.2-alpha. + + o Minor bugfixes (directory authorities): + - Directory authorities now reject votes that arrive too late. In + particular, once an authority has started fetching missing votes, + it no longer accepts new votes posted by other authorities. This + change helps prevent a consensus split, where only some authorities + have the late vote. Fixes bug 4631; bugfix on 0.2.0.5-alpha. + + o Minor bugfixes (git scripts): + - Stop executing the checked-out pre-commit hook from the pre-push + hook. Instead, execute the copy in the user's git directory. Fixes + bug 33284; bugfix on 0.4.1.1-alpha. + + o Minor bugfixes (initialization): + - Initialize the subsystems in our code in an order more closely + corresponding to their dependencies, so that every system is + initialized before the ones that (theoretically) depend on it. + Fixes bug 33316; bugfix on 0.4.0.1-alpha. + + o Minor bugfixes (IPv4, relay): + - Check for invalid zero IPv4 addresses and ports when sending and + receiving extend cells. Fixes bug 33900; bugfix on 0.2.4.8-alpha. + + o Minor bugfixes (IPv6, relay): + - Consider IPv6 addresses when checking if a connection is + canonical. In 17604, relays assumed that a remote relay could + consider an IPv6 connection canonical, but did not set the + canonical flag on their side of the connection. Fixes bug 33899; + bugfix on 0.3.1.1-alpha. + - Log IPv6 addresses on connections where this relay is the + responder. Previously, responding relays would replace the remote + IPv6 address with the IPv4 address from the consensus. Fixes bug + 33899; bugfix on 0.3.1.1-alpha. + + o Minor bugfixes (linux seccomp sandbox nss): + - Fix a startup crash when tor is compiled with --enable-nss and + sandbox support is enabled. Fixes bug 34130; bugfix on + 0.3.5.1-alpha. Patch by Daniel Pinto. + + o Minor bugfixes (logging, testing): + - Make all of tor's assertion macros support the ALL_BUGS_ARE_FATAL + and DISABLE_ASSERTS_IN_UNIT_TESTS debugging modes. (IF_BUG_ONCE() + used to log a non-fatal warning, regardless of the debugging + mode.) Fixes bug 33917; bugfix on 0.2.9.1-alpha. + + o Minor bugfixes (logs): + - Remove surprising empty line in the INFO-level log about circuit + build timeout. Fixes bug 33531; bugfix on 0.3.3.1-alpha. + + o Minor bugfixes (mainloop): + - Better guard against growing a buffer past its maximum 2GB in + size. Fixes bug 33131; bugfix on 0.3.0.4-rc. + + o Minor bugfixes (manual page): + - Update the man page to reflect that MinUptimeHidServDirectoryV2 + defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha. + + o Minor bugfixes (onion service v3, client): + - Remove a BUG() that was causing a stacktrace when a descriptor + changed at an unexpected time. Fixes bug 28992; bugfix + on 0.3.2.1-alpha. + + o Minor bugfixes (onion service, logging): + - Fix a typo in a log message PublishHidServDescriptors is set to 0. + Fixes bug 33779; bugfix on 0.3.2.1-alpha. + + o Minor bugfixes (portability): + - Fix a portability error in the configure script, where we were + using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5. + + o Minor bugfixes (protocol versions): + - Sort tor's supported protocol version lists, as recommended by the + tor directory specification. Fixes bug 33285; bugfix + on 0.4.0.1-alpha. + + o Minor bugfixes (relays): + - Stop advertising incorrect IPv6 ORPorts in relay and bridge + descriptors, when the IPv6 port was configured as "auto". Fixes + bug 32588; bugfix on 0.2.3.9-alpha. + + o Code simplification and refactoring: + - Define and use a new constant TOR_ADDRPORT_BUF_LEN which is like + TOR_ADDR_BUF_LEN but includes enough space for an IP address, + brackets, separating colon, and port number. Closes ticket 33956. + Patch by Neel Chauhan. + - Merge the orconn and ocirc events into the "core" subsystem, which + manages or connections and origin circuits. Previously they were + isolated in subsystems of their own. + - Move LOG_PROTOCOL_WARN to app/config. Resolves a dependency + inversion. Closes ticket 33633. + - Move the circuit extend code to the relay module. Split the + circuit extend function into smaller functions. Closes + ticket 33633. + - Rewrite port_parse_config() to use the default port flags from + port_cfg_new(). Closes ticket 32994. Patch by MrSquanchee. + - Updated comments in 'scheduler.c' to reflect old code changes, and + simplified the scheduler channel state change code. Closes + ticket 33349. + + o Documentation: + - Document the limitations of using %include on config files with + seccomp sandbox enabled. Fixes documentation bug 34133; bugfix on + 0.3.1.1-alpha. Patch by Daniel Pinto. + - Fix several doxygen warnings related to imbalanced groups. Closes + ticket 34255. + + o Removed features: + - Remove the ClientAutoIPv6ORPort option. This option attempted to + randomly choose between IPv4 and IPv6 for client connections, and + wasn't a true implementation of Happy Eyeballs. Often, this option + failed on IPv4-only or IPv6-only connections. Closes ticket 32905. + Patch by Neel Chauhan. + - Stop shipping contrib/dist/rc.subr file, as it is not being used + on FreeBSD anymore. Closes issue 31576. + + o Testing: + - Add a basic IPv6 test to "make test-network". This test only runs + when the local machine has an IPv6 stack. Closes ticket 33300. + - Add test-network-ipv4 and test-network-ipv6 jobs to the Makefile. + These jobs run the IPv4-only and dual-stack chutney flavours from + test-network-all. Closes ticket 33280. + - Remove a redundant distcheck job. Closes ticket 33194. + - Run the test-network-ipv6 Makefile target in the Travis CI IPv6 + chutney job. This job runs on macOS, so it's a bit slow. Closes + ticket 33303. + - 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. + - Test v3 onion services to tor's mixed IPv4 chutney network. And + add a mixed IPv6 chutney network. These networks are used in the + test-network-all, test-network-ipv4, and test-network-ipv6 make + targets. Closes ticket 33334. + - Use the "bridges+hs-v23" chutney network flavour in "make test- + network". This test requires a recent version of chutney (mid- + February 2020). Closes ticket 28208. + - When a Travis chutney job fails, use chutney's new "diagnostics.sh" + tool to produce detailed diagnostic output. Closes ticket 32792. + + o Code simplification and refactoring (onion service): + - Refactor configuration parsing to use the new config subsystem + code. Closes ticket 33014. + + o Code simplification and refactoring (relay address): + - Move a series of functions related to address resolving into their + own files. Closes ticket 33789. + + o Documentation (manual page): + - Add cross reference links and a table of contents to the HTML tor + manual page. Closes ticket 33369. Work by Swati Thacker as part of + Google Season of Docs. + - Alphabetize the Denial of Service Mitigation Options, Directory + Authority Server Options, Hidden Service Options, and Testing + Network Options sections of the tor(1) manual page. Closes ticket + 33275. Work by Swati Thacker as part of Google Season of Docs. + - Refrain from mentioning nicknames in manpage section for MyFamily + torrc option. Resolves issue 33417. + - Updated the options set by TestingTorNetwork in the manual page. + Closes ticket 33778. + + 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 @@ -27991,7 +29517,7 @@ Changes in version 0.2.0.33 - 2009-01-21 - Implement the 0x20 hack to better resist DNS poisoning: set the case on outgoing DNS requests randomly, and reject responses that do not match the case correctly. This logic can be disabled with the - ServerDNSRamdomizeCase setting, if you are using one of the 0.3% + ServerDNSRandomizeCase setting, if you are using one of the 0.3% of servers that do not reliably preserve case in replies. See "Increased DNS Forgery Resistance through 0x20-Bit Encoding" for more info. |