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New Alpha Release: Tor

时间:2021-09-19  来源:torproject  作者:ahf 条评论

There's a new alpha release available for download. If you build Tor from source, you can download the source code for from the download page on the website. Packages should be available over the coming weeks, with a new alpha Tor Browser release likely some time next week.Gv1免费翻墙网

Remember, this is an alpha release: you should only run this if you'd like to find and report more bugs than usual.Gv1免费翻墙网

This version is the first alpha release of the 0.4.7.x series. One major feature is Vanguards Lite, from proposal 333, to help mitigate guard discovery attacks against onion services. It also includes numerous bugfixes.Gv1免费翻墙网

Changes in version - 2021-09-17

  • Major features (Proposal 332, onion services, guard selection algorithm):
    • Clients and onion services now choose four long-lived "layer 2" guard relays for use as the middle hop in all onion circuits. These relays are kept in place for a randomized duration averaging 1 week. This mitigates guard discovery attacks against clients and short-lived onion services such as OnionShare. Long-lived onion services that need high security should still use the Vanguards addon ( Closes ticket 40363; implements proposal 333.
  • Minor features (bridge testing support):
    • Let external bridge reachability testing tools discard cached bridge descriptors when setting new bridges, so they can be sure to get a clean reachability test. Implements ticket 40209.


  • Minor features (fuzzing):
    • When building with --enable-libfuzzer, use a set of compiler flags that works with more recent versions of the library. Previously we were using a set of flags from 2017. Closes ticket 40407.
  • Minor features (testing configuration):
    • When TestingTorNetwork is enabled, skip the permissions check on hidden service directories. Closes ticket 40338.
    • On a testing network, relays can now use the TestingMinTimeToReportBandwidth option to change the smallest amount of time over which they're willing to report their observed maximum bandwidth. Previously, this was fixed at 1 day. For safety, values under 2 hours are only supported on testing networks. Part of a fix for ticket 40337.
    • Relays on testing networks no longer rate-limit how frequently they are willing to report new bandwidth measurements. Part of a fix for ticket 40337.
    • Relays on testing networks now report their observed bandwidths immediately from startup. Previously, they waited until they had been running for a full day. Closes ticket 40337.
  • Minor bugfixes (circuit padding):
    • Don't send STOP circuit padding cells when the other side has already shut down the corresponding padding machine. Fixes bug 40435; bugfix on
  • Minor bugfixes (compatibility):
    • Fix compatibility with the most recent Libevent versions, which no longer have an evdns_set_random_bytes() function. Because this function has been a no-op since Libevent 2.0.4-alpha, it is safe for us to just stop calling it. Fixes bug 40371; bugfix on
  • Minor bugfixes (control, sandbox):
    • Allows the control command SAVECONF to succeed when the seccomp sandbox is enabled. Makes SAVECONF keep only one backup file, to simplify implementation. Fixes bug 40317; bugfix on Patch by Daniel Pinto.
  • Minor bugfixes (heartbeat):
    • Adjust the heartbeat log message about distinct clients to consider the HeartbeatPeriod rather than a flat 6-hour delay. Fixes bug 40330; bugfix on
  • Minor bugfixes (logging, relay):
    • Add spaces between the "and" when logging the "Your server has not managed to confirm reachability for its" on dual-stack relays. Fixes bug 40453; bugfix on Patch by Neel Chauhan.
  • Minor bugfixes (onion service):
    • Do not flag an HSDir as non-running in case the descriptor upload or fetch fails. An onion service closes pending directory connections before uploading a new descriptor which leads to wrongly flagging many relays and thus affecting circuit path selection. Fixes bug 40434; bugfix on
  • Minor bugfixes (statistics):
    • Fix a fencepost issue when we check stability_last_downrated where we called rep_hist_downrate_old_runs() twice. Fixes bug 40394; bugfix on Patch by Neel Chauhan.
  • Minor bugfixes (tests):
    • Fix a bug that prevented some tests from running with the correct names. Fixes bug 40365; bugfix on
  • Documentation:
    • Add links to original tor design paper and anonbib to docs/HACKING/ Closes ticket 33742. Patch from Emily Bones.
    • Describe the "fingerprint-ed25519" file in the tor.1 man page. Fixes bug 40467; bugfix on Patch by Neel Chauhan.
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