#26060: Invalid [Length] field when receiving RELAY cells via stem.client.Circuit ---------------------------+------------------------ Reporter: plcp | Owner: atagar Type: defect | Status: new Priority: Medium | Milestone: Component: Core Tor/Stem | Version: Severity: Normal | Resolution: Keywords: client | Actual Points: Parent ID: | Points: Reviewer: | Sponsor: ---------------------------+------------------------
Comment (by plcp): Here is a little demo: {{{ git clone "https://git.torproject.org/stem.git" stem-client ln -s stem-client/stem virtualenv venv source venv/bin/activate pip install -r ./stem-client/requirements.txt tor PublishServerDescriptor 0 AssumeReachable 1 ExitRelay 0 ProtocolWarnings 1 SafeLogging 0 LogTimeGranularity 1 PidFile "$(mktemp)" SOCKSPort 0 ContactInfo n...@example.com DataDirectory "$(mktemp -d)" ORPort 9050 DirPort 9051 Log "err stderr" & wget https://raw.githubusercontent.com/plcp/tor- scripts/master/stem_26060_issue.py python stem_26060_issue.py }}} You should obtain something like that: {{{ Before repacking: Cell headers: - circ_id: 80000000 - command: 03 RELAY headers: - command: 6e - recognized: eab1 - stream_id: c650 - digest: 7e0f68b7 - length: 68e4 After repacking: Cell headers: - circ_id: 80000000 - command: 03 RELAY headers: - command: 6e - recognized: eab1 - stream_id: c650 - digest: 7e0f68b7 - length: 01f2 !! corrupted !! After decryption: Cell headers: - circ_id: 80000000 - command: 03 RELAY headers: - command: 04 RELAY_CONNECTED - recognized: 0000 - stream_id: 0001 - digest: a0b49e85 - length: 6916 !! corrupted !! Digest (from the RELAY cell): a0b49e85 Digest (computed length): db7932a8 Digest (expected length): a0b49e85 }}} I've managed to fix this issue as follows: https://github.com/plcp/stem- client/commit/0e2ec2627df05ffcbd2d93be52b862e111bb400b (note that I'm only using `stem.client.cell` and thus haven't modified `stem.client.Circuit` accordingly) -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26060#comment:3> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
_______________________________________________ tor-bugs mailing list tor-bugs@lists.torproject.org https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-bugs