[tor-bugs] #13587 [Pluggable transport]: Bug found while running ooniprobe in Iran

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#13587: Bug found while running ooniprobe in Iran
---------------------------------+---------------------
 Reporter:  hellais              |          Owner:  asn
     Type:  defect               |         Status:  new
 Priority:  normal               |      Milestone:
Component:  Pluggable transport  |        Version:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
---------------------------------+---------------------
 We got an ooniprobe that indicates that this error is thrown in some cases
 when running scramble suit.
 See the report here:
 http://reports.ooni.nu/IR/bridge_reachability-2014-10-24T213005Z-
 AS21341-probe.yamloo


 Relevant obfsproxy log:

 {{{

 2014-10-25 04:44:43,342 [WARNING] Obfsproxy (version: 0.2.12) starting up.
 2014-10-25 04:44:43,342 [INFO] Entering client managed-mode.
 2014-10-25 04:44:43,343 [ERROR]

 ################################################
 Do NOT rely on ScrambleSuit for strong security!
 ################################################

 2014-10-25 04:44:43,343 [INFO] Creating directory path
 `/tmp/tortmpXcfTNH/pt_state/scramblesuit/'.
 2014-10-25 04:44:43,344 [INFO] OBFSSOCKSv5Factory starting on 57513
 2014-10-25 04:44:43,344 [INFO] Starting factory
 <obfsproxy.network.socks.OBFSSOCKSv5Factory instance at 0x32bcea8>
 2014-10-25 04:44:43,344 [INFO] Starting up the event loop.
 2014-10-25 04:44:44,561 [ERROR] Unhandled Error
 Traceback (most recent call last):
   File "/usr/local/lib/python2.7/dist-packages/twisted/python/log.py",
 line 88, in callWithLogger
     return callWithContext({"system": lp}, func, *args, **kw)
   File "/usr/local/lib/python2.7/dist-packages/twisted/python/log.py",
 line 73, in callWithContext
     return context.call({ILogContext: newCtx}, func, *args, **kw)
   File "/usr/local/lib/python2.7/dist-packages/twisted/python/context.py",
 line 118, in callWithContext
     return self.currentContext().callWithContext(ctx, func, *args, **kw)
   File "/usr/local/lib/python2.7/dist-packages/twisted/python/context.py",
 line 81, in callWithContext
     return func(*args,**kw)
 --- <exception caught here> ---
   File "/usr/local/lib/python2.7/dist-
 packages/twisted/internet/posixbase.py", line 619, in _doReadOrWrite
     why = selectable.doWrite()
   File "/usr/local/lib/python2.7/dist-packages/twisted/internet/tcp.py",
 line 592, in doConnect
     self._connectDone()
   File "/usr/local/lib/python2.7/dist-packages/twisted/internet/tcp.py",
 line 611, in _connectDone
     self.protocol.makeConnection(self)
   File "/usr/local/lib/python2.7/dist-
 packages/twisted/internet/protocol.py", line 481, in makeConnection
     self.connectionMade()
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy/network/socks.py", line 54, in connectionMade
     self.socks.set_up_circuit(self)
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy/network/socks.py", line 162, in set_up_circuit
     self.circuit.setUpstreamConnection(self)
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy/network/network.py", line 109, in setUpstreamConnection
     self.circuitCompleted(self.downstream)
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy/network/network.py", line 134, in circuitCompleted
     self.transport.circuitConnected()
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy/transports/scramblesuit/scramblesuit.py", line 242, in
 circuitConnected
     self.circuit.downstream.write(self.uniformdh.createHandshake())
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy/transports/scramblesuit/uniformdh.py", line 168, in
 createHandshake
     assert self.sharedSecret is not None
 exceptions.AssertionError:

 2014-10-25 04:51:21,990 [INFO] Received SIGTERM, shutting down.
 2014-10-25 04:51:21,990 [INFO] (TCP Port 57513 Closed)
 2014-10-25 04:51:21,991 [INFO] Stopping factory
 <obfsproxy.network.socks.OBFSSOCKSv5Factory instance at 0x32bcea8>
 2014-10-25 04:51:21,991 [INFO] Main loop terminated.

 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13587>
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