[tor-bugs] #15240 [Pluggable transport]: ExtORPort authentication failure

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#15240: ExtORPort authentication failure
---------------------------------+---------------------
 Reporter:  qbi                  |          Owner:  asn
     Type:  defect               |         Status:  new
 Priority:  normal               |      Milestone:
Component:  Pluggable transport  |        Version:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
---------------------------------+---------------------
 I'm using 0.2.5.10-1~d70.wheezy+1 from Debian and obfs4proxy 0.0.4-1 to
 set up a some bridges. My torrc looks like:
 {{{
 Address 192.0.2.23
 OutboundBindAddress 192.0.2.23
 OutboundBindAddress 2001:db8::94de
 ORPort 56527
 ExtORPort 55009
 ORListenAddress 192.0.2.23:56527
 ORListenAddress [2001:db8::94de]:56527
 DataDirectory /var/lib/tor
 PidFile /var/run/tor/tor.pid
 Log notice file /var/log/tor/notices.log
 ServerTransportPlugin scramblesuit exec /usr/bin/obfsproxy managed
 ServerTransportPlugin obfs3,obfs4 exec /usr/bin/obfs4proxy -enableLogging
 -logLevel=INFO
 ServerTransportListenAddr obfs3 192.0.2.23:33027
 ServerTransportListenAddr obfs3 [2001:db8::94de]:33027
 ServerTransportListenAddr obfs4 192.0.2.23:47131
 ServerTransportListenAddr obfs4 [2001:db8::94de]:47131
 ServerTransportListenAddr scramblesuit 192.0.2.23:16428
 ServerTransportListenAddr scramblesuit [2001:db8::94de]:16428
 ContactInfo me at example.org
 User debian-tor
 RunAsDaemon 1
 NumCPUs 1
 PublishServerDescriptor 1
 SocksPort 0
 BridgeRelay 1
 Exitpolicy reject *:*
 Exitpolicy reject6 *:*
 BridgeRecordUsageByCountry 1
 ConnDirectionStatistics 1
 EntryStatistics 1
 ExtraInfoStatistics 1
 DynamicDHGroups 1
 HardwareAccel 1
 }}}

 When I enter the bridge line in TBB 4.5a4, I can't get a connection.
 Looking at the obfs4proxy.log, I see the message:

 > 2015/03/11 22:19:25 [ERROR]: obfs4([scrubbed]:58915) - failed to connect
 to ORPort: mismatch in server hash

 When I comment out the {{{ExtORPort}}} line and restart Tor, I can connect
 to the bridge. If I set {{{ExtORPort auto}}} I can't get a connection.
 Later I'll provide a more detailed log.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15240>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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