#28293: Corrupted obfs4proxy executable after restarts when bridges were offline -------------------------------------------------+-------------------- Reporter: traumschule | Owner: asn Type: defect | Status: new Priority: Medium | Milestone: Component: Obfuscation/Pluggable transport | Version: Severity: Normal | Keywords: Actual Points: | Parent ID: #25502 Points: | Reviewer: Sponsor: | -------------------------------------------------+-------------------- Testing bridges in TB 8.0.3 (with tor 0.3.4.8) two of the requested bridges were offline (see #28291) and bootstrapping was stuck at 71% (This is a known issue tor prior 0.3.5, see #25502).
Going back and changing from requested to built in obfs4 bridges didn't have any effect, bootstrapping still hung. After restarting the browser it hung at 20%. Restarted the browser again and requested new bridges the UI told > Connecting to a relay directory failed (missing pluggable transport... (took debug and info logs, will attach them later) After a hint by dcf1 on IRC i turned on logging: > To enable obfs4proxy logging, edit Browser/TorBrowser/Data/Tor/torrc- defaults and add "--enableLogging --logLevel=INFO --unsafeLogging" to the "ClientTransportPlugin obfs2,obfs3,obfs4,scramblesuit" line. > Then the log will be written to Browser/TorBrowser/Data/Tor/pt_state/obfs4proxy.log {{{ 11/3/18, 05:44:15.821 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 11/3/18, 05:44:15.821 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 11/3/18, 05:44:15.821 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 11/3/18, 05:44:15.822 [NOTICE] Opening Socks listener on 127.0.0.1:9150 11/3/18, 05:44:16.722 [WARN] The communication stream of managed proxy './TorBrowser/Tor/PluggableTransports/obfs4proxy' is 'closed'. Most probably the managed proxy stopped running. This might be a bug of the managed proxy, a bug of Tor, or a misconfiguration. Please enable logging on your managed proxy and check the logs for errors. 11/3/18, 05:44:16.722 [NOTICE] Ignoring directory request, since no bridge nodes are available yet. 11/3/18, 05:44:17.788 [NOTICE] Bridge 'Unnamed' has both an IPv4 and an IPv6 address. Will prefer using its IPv4 address (146.196.65.18:443) based on the configured Bridge address. 11/3/18, 05:44:17.788 [NOTICE] Bootstrapped 5%: Connecting to directory server 11/3/18, 05:44:17.790 [WARN] We were supposed to connect to bridge '102.253.68.166:43775' using pluggable transport 'obfs4', but we can't find a pluggable transport proxy supporting 'obfs4'. This can happen if you haven't provided a ClientTransportPlugin line, or if your pluggable transport proxy stopped running. 11/3/18, 05:44:17.791 [WARN] Problem bootstrapping. Stuck at 5%: Connecting to directory server. (Can't connect to bridge; PT_MISSING; count 1; recommendation warn; host 8D5F75269D5E0D2B9A1B0FA3D5A3BCA0EFC7F313 at 102.253.68.166:43775) 11/3/18, 05:44:17.809 [WARN] We were supposed to connect to bridge '146.196.65.18:443' using pluggable transport 'obfs4', but we can't find a pluggable transport proxy supporting 'obfs4'. This can happen if you haven't provided a ClientTransportPlugin line, or if your pluggable transport proxy stopped running. 11/3/18, 05:44:17.809 [WARN] Problem bootstrapping. Stuck at 5%: Connecting to directory server. (Can't connect to bridge; PT_MISSING; count 2; recommendation warn; host 642201EDF4BF5E3898E4F34B930032B00E3BA27C at 146.196.65.18:443) 11/3/18, 05:44:17.810 [WARN] We were supposed to connect to bridge '24.154.179.248:44673' using pluggable transport 'obfs4', but we can't find a pluggable transport proxy supporting 'obfs4'. This can happen if you haven't provided a ClientTransportPlugin line, or if your pluggable transport proxy stopped running. 11/3/18, 05:44:17.810 [WARN] Problem bootstrapping. Stuck at 5%: Connecting to directory server. (Can't connect to bridge; PT_MISSING; count 3; recommendation warn; host 1AAEE6A3B52C69A3D74E9EDEEDE9F15BE3182C3F at 24.154.179.248:44673) 11/3/18, 05:44:17.812 [NOTICE] Closing no-longer-configured Socks listener on 127.0.0.1:9150 11/3/18, 05:44:17.812 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 11/3/18, 05:44:17.812 [NOTICE] Closing old Socks listener on 127.0.0.1:9150 }}} Run manually: {{{ ./Browser/TorBrowser/Tor/PluggableTransports/obfs4proxy --enableLogging --logLevel=INFO --unsafeLogging Segmentation fault }}} With gdb: {{{ $ gdb --args ./Browser/TorBrowser/Tor/PluggableTransports/obfs4proxy --enableLogging --logLevel=INFO --unsafeLogging GNU gdb (Debian 8.1-4+b1) 8.1 Copyright (C) 2018 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... "/home/tbb/tor-browser_en- US/./Browser/TorBrowser/Tor/PluggableTransports/obfs4proxy": not in executable format: File truncated (gdb) run Starting program: --enableLogging --logLevel=INFO --unsafeLogging No executable file specified. }}} I have no clue how it got corrupted, will attach it and a screenshot of the UI that maybe should also tell something like: > Failed to start bridge executable. Please try again with a fresh Tor Browser. -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28293> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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