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New Release: Tor 0.4.4.5

时间:2020-09-23  来源:torproject  作者:nickm 条评论

After months of work, we have a new stable release series!6WE免费翻墙网
If you build Tor from source, you can download the source6WE免费翻墙网
code for 0.4.4.5 on the6WE免费翻墙网
download page.6WE免费翻墙网
Packages should be available within the next several weeks, with a new Tor Browser by some time next week.6WE免费翻墙网

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.6WE免费翻墙网

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.6WE免费翻墙网

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 2022.6WE免费翻墙网

Below are the changes since 0.4.3.6-rc. For a complete list of changes since 0.4.4.4-rc, see the ChangeLog file.6WE免费翻墙网

Changes in version 0.4.4.5 - 2020-09-15

  • 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.)
  • 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.

 6WE免费翻墙网

  • 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.
  • Major features (v3 onion services):
    • Allow v3 onion services to act as OnionBalance backend instances, by using the HiddenServiceOnionBalanceInstance torrc option. Closes ticket 32709.
  • 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.
  • 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.
  • 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.
  • Minor features (security):
    • 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.
  • 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.
  • 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.
    • Most server-side DNS code is now disabled when building without support for relay mode. Closes ticket 33366.
  • 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.
  • 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.
  • 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.
    • 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.
  • Minor features (defense in depth):
    • Wipe more data from connection address fields before returning them to the memory heap. Closes ticket 6198.
  • 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.
  • Minor features (developer tooling):
    • Add a script to help check the alphabetical ordering of option names in the manual page. Closes ticket 33339.
    • 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.
  • 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.
  • 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.
  • 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.
  • Minor features (entry guards):
    • Reinstate support for GUARD NEW/UP/DOWN control port events. Closes ticket 40001.
  • 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.
  • 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.
  • Minor features (logging):
    • When trying to find our own address, add debug-level logging to report the sources of candidate addresses. Closes ticket 32888.
  • Minor features (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.
  • Minor features (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.
  • Minor features (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.
  • 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.
    • 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.
  • 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.
  • Minor features (windows):
    • Add support for console control signals like Ctrl+C in Windows. Closes ticket 34211. Patch from Damon Harris (TheDcoder).
  • 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.
  • Minor bugfixes (correctness, buffers):
    • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
    • Remove surprising empty line in the INFO-level log about circuit build timeout. Fixes bug 33531; bugfix on 0.3.3.1-alpha.
  • 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.
  • Minor bugfixes (onion service v3 client):
    • Remove a BUG() warning that could occur naturally. Fixes bug 34087; bugfix on 0.3.2.1-alpha.
  • 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.
  • 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.
  • 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.
  • Minor bugfixes (rate limiting, bridges, pluggable transports):
    • 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.
  • Minor bugfixes (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.
  • Minor bugfixes (relay, self-testing):
    • When starting up as a relay, if we haven't been able to verify that we're reachable, only launch reachability tests at most once a minute. Previously, we had been launching tests up to once a second, which was needlessly noisy. Fixes bug 40083; bugfix on 0.2.8.1-alpha.
  • 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.
  • Minor bugfixes (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.
  • 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.
  • Minor bugfixes (v3 onion services):
    • Remove a BUG() warning that could trigger in certain unlikely edge-cases. Fixes bug 34086; bugfix on 0.3.2.1-alpha.
    • 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.
  • Minor bugfixes (windows):
    • 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.
  • 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.
    • Refactor configuration parsing to use the new config subsystem code. Closes ticket 33014.
    • Move a series of functions related to address resolving into their own files. Closes ticket 33789.
  • 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.
    • 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.
  • 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.
    • 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.
  • 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.
  • Deprecated features (onion service v2):
    • Add a deprecation warning for version 2 onion services. Closes ticket 40003.
  • 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.
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