ReleaseNotes

      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 0.3.3.11 - 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 0.3.4.9. For a complete list of changes
  since 0.3.5.6-rc, see the ChangeLog file.

  o Major features (bootstrap):
    - Don't report directory progress until after a connection to a
      relay or bridge has succeeded. Previously, we'd report 80%
      progress based on cached directory information when we couldn't
      even connect to the network. Closes ticket 27169.

  o Major features (new code layout):
    - Nearly all of Tor's source code has been moved around into more
      logical places. The "common" directory is now divided into a set
      of libraries in "lib", and files in the "or" directory have been
      split into "core" (logic absolutely needed for onion routing),
      "feature" (independent modules in Tor), and "app" (to configure
      and invoke the rest of Tor). See doc/HACKING/CodeStructure.md for
      more information. Closes ticket 26481.

      This refactoring is not complete: although the libraries have been
      refactored to be acyclic, the main body of Tor is still too
      interconnected. We will attempt to improve this in the future.

  o Major features (onion services v3):
    - Implement onion service client authorization at the descriptor
      level: only authorized clients can decrypt a service's descriptor
      to find out how to contact it. A new torrc option was added to
      control this client side: ClientOnionAuthDir <path>. On the
      service side, if the "authorized_clients/" directory exists in the
      onion service directory path, client configurations are read from
      the files within. See the manpage for more details. Closes ticket
      27547. Patch done by Suphanat Chunhapanya (haxxpop).
    - Improve revision counter generation in next-gen onion services.
      Onion services can now scale by hosting multiple instances on
      different hosts without synchronization between them, which was
      previously impossible because descriptors would get rejected by
      HSDirs. Addresses ticket 25552.
    - Version 3 onion services can now use the per-service
      HiddenServiceExportCircuitID option to differentiate client
      circuits. It communicates with the service by using the HAProxy
      protocol to assign virtual IP addresses to inbound client
      circuits. Closes ticket 4700. Patch by Mahrud Sayrafi.

  o Major features (onion services, UI change):
    - For a newly created onion service, the default version is now 3.
      Tor still supports existing version 2 services, but the operator
      now needs to set "HiddenServiceVersion 2" in order to create a new
      version 2 service. For existing services, Tor now learns the
      version by reading the key file. Closes ticket 27215.

  o Major features (portability, cryptography, experimental, TLS):
    - Tor now has the option to compile with the NSS library instead of
      OpenSSL. This feature is experimental, and we expect that bugs may
      remain. It is mainly intended for environments where Tor's
      performance is not CPU-bound, and where NSS is already known to be
      installed. To try it out, configure Tor with the --enable-nss
      flag. Closes tickets 26631, 26815, and 26816.

      If you are experimenting with this option and using an old cached
      consensus, Tor may fail to start. To solve this, delete your
      "cached-consensus" and "cached-microdesc-consensus" files,
      (if present), and restart Tor.

  o Major features (relay, UI change):
    - Relays no longer run as exits by default. If the "ExitRelay"
      option is auto (or unset), and no exit policy is specified with
      ExitPolicy or ReducedExitPolicy, we now treat ExitRelay as 0.
      Previously in this case, we allowed exit traffic and logged a
      warning message. Closes ticket 21530. Patch by Neel Chauhan.
    - Tor now validates that the ContactInfo config option is valid UTF-
      8 when parsing torrc. Closes ticket 27428.

  o Major bugfixes (compilation):
    - Fix compilation on ARM (and other less-used CPUs) when compiling
      with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.

  o Major bugfixes (compilation, rust):
    - Rust tests can now build and run successfully with the
      --enable-fragile-hardening option enabled. Doing this currently
      requires the rust beta channel; it will be possible with stable
      rust once Rust version 1.31 is released. Patch from Alex Crichton.
      Fixes bugs 27272, 27273, and 27274. Bugfix on 0.3.1.1-alpha.

  o Major bugfixes (directory authority):
    - Actually check that the address we get from DirAuthority
      configuration line is valid IPv4. Explicitly disallow DirAuthority
      address to be a DNS hostname. Fixes bug 26488; bugfix
      on 0.1.2.10-rc.

  o Major bugfixes (embedding, main loop):
    - When DisableNetwork becomes set, actually disable periodic events
      that are already enabled. (Previously, we would refrain from
      enabling new ones, but we would leave the old ones turned on.)
      Fixes bug 28348; bugfix on 0.3.4.1-alpha.

  o Major bugfixes (main loop, bootstrap):
    - Make sure Tor bootstraps and works properly if only the
      ControlPort is set. Prior to this fix, Tor would only bootstrap
      when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
      port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.

  o Major bugfixes (onion service v3):
    - On an intro point for a version 3 onion service, stop closing
      introduction circuits on a 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.

  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 Major bugfixes (relay bandwidth statistics):
    - When we close relayed circuits, report the data in the circuit
      queues as being written in our relay bandwidth stats. This
      mitigates guard discovery and other attacks that close circuits
      for the explicit purpose of noticing this discrepancy in
      statistics. Fixes bug 23512; bugfix on 0.0.8pre3.

  o Major bugfixes (relay):
    - When our write bandwidth limit is exhausted, stop writing on the
      connection. Previously, we had a typo in the code that would make
      us stop reading instead, leading to relay connections being stuck
      indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
      on 0.3.4.1-alpha.
    - 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 Major bugfixes (restart-in-process):
    - 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 (admin tools):
    - Add a new --key-expiration option to print the expiration date of
      the signing cert in an ed25519_signing_cert file. Resolves
      issue 19506.

  o Minor features (build):
    - If you pass the "--enable-pic" option to configure, Tor will try
      to tell the compiler to build position-independent code suitable
      to link into a dynamic library. (The default remains -fPIE, for
      code suitable for a relocatable executable.) Closes ticket 23846.

  o Minor features (code correctness, testing):
    - Tor's build process now includes a "check-includes" make target to
      verify that no module of Tor relies on any headers from a higher-
      level module. We hope to use this feature over time to help
      refactor our codebase. Closes ticket 26447.

  o Minor features (code layout):
    - We have a new "lowest-level" error-handling API for use by code
      invoked from within the logging module. With this interface, the
      logging code is no longer at risk of calling into itself if a
      failure occurs while it is trying to log something. Closes
      ticket 26427.

  o Minor features (compilation):
    - When possible, place our warning flags in a separate file, to
      avoid flooding verbose build logs. Closes ticket 28924.
    - Tor's configure script now supports a --with-malloc= option to
      select your malloc implementation. Supported options are
      "tcmalloc", "jemalloc", "openbsd" (deprecated), and "system" (the
      default). Addresses part of ticket 20424. Based on a patch from
      Alex Xu.

  o Minor features (config):
    - The "auto" keyword in torrc is now case-insensitive. Closes
      ticket 26663.

  o Minor features (continuous integration):
    - Add a Travis CI build for --enable-nss on Linux gcc. Closes
      ticket 27751.
    - Add new CI job to Travis configuration to run stem-based
      integration tests. Closes ticket 27913.
    - 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.
    - Report what program produced the mysterious core file that we
      occasionally see on Travis CI during make distcheck. Closes
      ticket 28024.
    - Don't do a distcheck with --disable-module-dirauth in Travis.
      Implements ticket 27252.
    - Install libcap-dev and libseccomp2-dev so these optional
      dependencies get tested on Travis CI. Closes ticket 26560.
    - 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, Windows):
    - Always show the configure and test logs, and upload them as build
      artifacts, when building for Windows using Appveyor CI.
      Implements 28459.
    - Build tor on Windows Server 2012 R2 and Windows Server 2016 using
      Appveyor's CI. Closes ticket 28318.

  o Minor features (controller):
    - Emit CIRC_BW events as soon as we detect that we processed an
      invalid or otherwise dropped cell on a circuit. This allows
      vanguards and other controllers to react more quickly to dropped
      cells. Closes ticket 27678.
    - 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.
    - Implement a 'GETINFO md/all' controller command to enable getting
      all known microdescriptors. Closes ticket 8323.
    - The GETINFO command now support an "uptime" argument, to return
      Tor's uptime in seconds. Closes ticket 25132.

  o Minor features (denial-of-service avoidance):
    - Make our OOM handler aware of the DNS cache so that it doesn't
      fill up the memory. This check is important for our DoS mitigation
      subsystem. Closes ticket 18642. Patch by Neel Chauhan.

  o Minor features (development):
    - Tor's makefile now supports running the "clippy" Rust style tool
      on our Rust code. Closes ticket 22156.

  o Minor features (directory authority):
    - There is no longer an artificial upper limit on the length of
      bandwidth lines. Closes ticket 26223.
    - When a bandwidth file is used to obtain the bandwidth measurements,
      include this bandwidth file headers in the votes. Closes
      ticket 3723.
    - Improved support for networks with only a single authority or a
      single fallback directory. Patch from Gabriel Somlo. Closes
      ticket 25928.

  o Minor features (embedding API):
    - The Tor controller API now supports a function to launch Tor with
      a preconstructed owning controller FD, so that embedding
      applications don't need to manage controller ports and
      authentication. Closes ticket 24204.
    - The Tor controller API now has a function that returns the name
      and version of the backend implementing the API. Closes
      ticket 26947.

  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 January 3 2019 Maxmind GeoLite2
      Country database. Closes ticket 29012.

  o Minor features (memory management):
    - Get Libevent to use the same memory allocator as Tor, by calling
      event_set_mem_functions() during initialization. Resolves
      ticket 8415.

  o Minor features (memory usage):
    - When not using them, store legacy TAP public onion keys in DER-
      encoded format, rather than as expanded public keys. This should
      save several megabytes on typical clients. Closes ticket 27246.

  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 (OpenSSL):
    - When possible, use RFC5869 HKDF implementation from OpenSSL rather
      than our own. Resolves ticket 19979.

  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 features (Rust, code quality):
    - Improve rust code quality in the rust protover implementation by
      making it more idiomatic. Includes changing an internal API to
      take &str instead of &String. Closes ticket 26492.

  o Minor features (testing):
    - Add scripts/test/chutney-git-bisect.sh, for bisecting using
      chutney. Implements ticket 27211.

  o Minor features (tor-resolve):
    - The tor-resolve utility can now be used with IPv6 SOCKS proxies.
      Side-effect of the refactoring for ticket 26526.

  o Minor features (UI):
    - Log each included configuration file or directory as we read it,
      to provide more visibility about where Tor is reading from. Patch
      from Unto Sten; closes ticket 27186.
    - Lower log level of "Scheduler type KIST has been enabled" to INFO.
      Closes ticket 26703.

  o Minor bugfixes (32-bit OSX and iOS, timing):
    - Fix an integer overflow bug in our optimized 32-bit millisecond-
      difference algorithm for 32-bit Apple platforms. Previously, it
      would overflow when calculating the difference between two times
      more than 47 days apart. Fixes part of bug 27139; bugfix
      on 0.3.4.1-alpha.
    - Improve the precision of our 32-bit millisecond difference
      algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
      bugfix on 0.3.4.1-alpha.
    - Relax the tolerance on the mainloop/update_time_jumps test when
      running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
      on 0.3.4.1-alpha.

  o Minor bugfixes (bootstrap):
    - Try harder to get descriptors in non-exit test networks, by using
      the mid weight for the third hop when there are no exits. Fixes
      bug 27237; bugfix on 0.2.6.2-alpha.

  o Minor bugfixes (C correctness):
    - Avoid casting smartlist index to int implicitly, as it may trigger
      a warning (-Wshorten-64-to-32). Fixes bug 26282; bugfix on
      0.2.3.13-alpha, 0.2.7.1-alpha and 0.2.1.1-alpha.
    - Use time_t for all values in
      predicted_ports_prediction_time_remaining(). Rework the code that
      computes difference between durations/timestamps. Fixes bug 27165;
      bugfix on 0.3.1.1-alpha.

  o Minor bugfixes (client, memory usage):
    - When not running as a directory cache, there is no need to store
      the text of the current consensus networkstatus in RAM.
      Previously, however, clients would store it anyway, at a cost of
      over 5 MB. Now, they do not. Fixes bug 27247; bugfix
      on 0.3.0.1-alpha.

  o Minor bugfixes (client, ReachableAddresses):
    - Instead of adding a "reject *:*" line to ReachableAddresses when
      loading the configuration, add one to the policy after parsing it
      in parse_reachable_addresses(). This prevents extra "reject *.*"
      lines from accumulating on reloads. Fixes bug 20874; bugfix on
      0.1.1.5-alpha. Patch by Neel Chauhan.

  o Minor bugfixes (code quality):
    - Rename sandbox_getaddrinfo() and other functions to no longer
      misleadingly suggest that they are sandbox-only. Fixes bug 26525;
      bugfix on 0.2.7.1-alpha.

  o Minor bugfixes (code safety):
    - Rewrite our assertion macros so that they no longer suppress the
      compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
      on 0.0.6.

  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 (configuration):
    - Refuse to start with relative file paths and RunAsDaemon set
      (regression from the fix for bug 22731). Fixes bug 28298; bugfix
      on 0.3.3.1-alpha.

  o Minor bugfixes (configuration, Onion Services):
    - In rend_service_parse_port_config(), disallow any input to remain
      after address-port pair was parsed. This will catch address and
      port being whitespace-separated by mistake of the user. Fixes bug
      27044; bugfix on 0.2.9.10.

  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):
    - Stop reinstalling identical packages in our Windows CI. Fixes bug
      27464; bugfix on 0.3.4.1-alpha.
    - Install only the necessary mingw packages during our appveyor
      builds. This change makes the build a little faster, and prevents
      a conflict with a preinstalled mingw openssl that appveyor now
      ships. Fixes bugs 27765 and 27943; bugfix on 0.3.4.2-alpha.
    - 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.
    - 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 (controller):
    - Consider all routerinfo errors other than "not a server" to be
      transient for the purpose of "GETINFO exit-policy/*" controller
      request. Print stacktrace in the unlikely case of failing to
      recompute routerinfo digest. Fixes bug 27034; bugfix
      on 0.3.4.1-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 (directory connection shutdown):
    - Avoid a double-close when shutting down a stalled directory
      connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.

  o Minor bugfixes (directory permissions):
    - 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 (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 (ipv6):
    - In addrs_in_same_network_family(), we choose the subnet size based
      on the IP version (IPv4 or IPv6). Previously, we chose a fixed
      subnet size of /16 for both IPv4 and IPv6 addresses. Fixes bug
      15518; bugfix on 0.2.3.1-alpha. Patch by Neel Chauhan.

  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.
    - As a precaution, do an early return from log_addr_has_changed() if
      Tor is running as client. Also, log a stack trace for debugging as
      this function should only be called when Tor runs as server. Fixes
      bug 26892; bugfix on 0.1.1.9-alpha.
    - Refrain from mentioning bug 21018 in the logs, as it is already
      fixed. Fixes bug 25477; bugfix on 0.2.9.8.

  o Minor bugfixes (logging, documentation):
    - When SafeLogging is enabled, scrub IP address in
      channel_tls_process_netinfo_cell(). Also, add a note to manpage
      that scrubbing is not guaranteed on loglevels below Notice. Fixes
      bug 26882; bugfix on 0.2.4.10-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.
    - Fix a small memory leak when calling Tor with --dump-config. Fixes
      bug 27893; bugfix on 0.3.2.1-alpha.

  o Minor bugfixes (netflow padding):
    - Ensure circuitmux queues are empty before scheduling or sending
      padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.

  o Minor bugfixes (onion service v2):
    - Log at level "info", not "warning", in the case that we do not
      have a consensus when a .onion request comes in. This can happen
      normally while bootstrapping. Fixes bug 27040; bugfix
      on 0.2.8.2-alpha.

  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.
    - Build the service descriptor's signing key certificate before
      uploading, so we always have a fresh one: leaving no chances for
      it to expire service side. Fixes bug 27838; bugfix
      on 0.3.2.1-alpha.
    - Stop dumping a stack trace when trying to connect to an intro
      point without having a descriptor for it. Fixes bug 27774; bugfix
      on 0.3.2.1-alpha.
    - When selecting a v3 rendezvous point, don't only look at the
      protover, but also check whether the curve25519 onion key is
      present. This way we avoid picking a relay that supports the v3
      rendezvous but for which we don't have the microdescriptor. Fixes
      bug 27797; bugfix on 0.3.2.1-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.
    - 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.
    - 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.

  o Minor bugfixes (OS compatibility):
    - Properly handle configuration changes that move a listener to/from
      wildcard IP address. If the first attempt to bind a socket fails,
      close the old listener and try binding the socket again. Fixes bug
      17873; bugfix on 0.0.8pre-1.

  o Minor bugfixes (performance)::
    - Rework node_is_a_configured_bridge() to no longer call
      node_get_all_orports(), which was performing too many memory
      allocations. Fixes bug 27224; bugfix on 0.2.3.9.

  o Minor bugfixes (protover):
    - 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 (protover, rust):
    - Reject extra commas in version strings. Fixes bug 27197; bugfix
      on 0.3.3.3-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.
    - 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 (relay shutdown, systemd):
    - Notify systemd of ShutdownWaitLength so it can be set to longer
      than systemd's TimeoutStopSec. In Tor's systemd service file, set
      TimeoutSec to 60 seconds to allow Tor some time to shut down.
      Fixes bug 28113; bugfix on 0.2.6.2-alpha.

  o Minor bugfixes (relay statistics):
    - 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 (relay):
    - Consider the fact that we'll be making direct connections to our
      entry and guard nodes when computing the fraction of nodes that
      have their descriptors. Also, if we are using bridges and there is
      at least one bridge with a full descriptor, treat the fraction of
      guards available as 100%. Fixes bug 25886; bugfix on 0.2.4.10-alpha.
      Patch by Neel Chauhan.
    - Update the message logged on relays when DirCache is disabled.
      Since 0.3.3.5-rc, authorities require DirCache (V2Dir) for the
      Guard flag. Fixes bug 24312; bugfix on 0.3.3.5-rc.

  o Minor bugfixes (testing):
    - 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.
    - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
      bugfix on 0.3.0.1-alpha.
    - Make the hs_service tests use the same time source when creating
      the introduction point and when testing it. Now tests work better
      on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
      on 0.3.2.1-alpha.
    - Revise the "conditionvar_timeout" test so that it succeeds even on
      heavily loaded systems where the test threads are not scheduled
      within 200 msec. Fixes bug 27073; bugfix on 0.2.6.3-alpha.
    - Fix two unit tests to work when HOME environment variable is not
      set. Fixes bug 27096; bugfix on 0.2.8.1-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.
    - When logging a version mismatch in our openssl_version tests,
      report the actual offending version strings. Fixes bug 26152;
      bugfix on 0.2.9.1-alpha.
    - Fix forking tests on Windows when there is a space somewhere in
      the path. Fixes bug 26437; bugfix on 0.2.2.4-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 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.
    - Divide more large Tor source files -- especially ones that span
      multiple areas of functionality -- into smaller parts, including
      onion.c and main.c. Closes ticket 26747.
    - Divide the "routerparse.c" module into separate modules for each
      group of parsed objects. Closes ticket 27924.
    - Move protover_rust.c to the same place protover.c was moved to.
      Closes ticket 27814.
    - Split directory.c into separate pieces for client, server, and