[tor-bugs] #28293 [Obfuscation/Pluggable transport]: Corrupted obfs4proxy executable after restarts when bridges were offline
Tor Bug Tracker & Wiki
blackhole at torproject.org
Sat Nov 3 06:18:49 UTC 2018
#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
More information about the tor-bugs
mailing list