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Re: [tor-bugs] #11769 [Obfsproxy]: Unexpected `NoneType` in obfs3

Subject: Re: [tor-bugs] #11769 [Obfsproxy]: Unexpected `NoneType` in obfs3
From: "Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>
Date: Thu, 08 May 2014 14:15:49 -0000
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#11769: Unexpected `NoneType` in obfs3
---------------------------+-----------------
     Reporter:  asn        |      Owner:  asn
         Type:  defect     |     Status:  new
     Priority:  normal     |  Milestone:
    Component:  Obfsproxy  |    Version:
   Resolution:             |   Keywords:
Actual Points:             |  Parent ID:
       Points:             |
---------------------------+-----------------
Description changed by asn:

Old description:

> Since my obfs3 bridge has gotten more popular, I decided to enable
> logging and I noticed that I've been getting these errors:
>
> {{{
> 2014-05-06 15:49:51,869 [ERROR] Unhandled error in Deferred:
> 2014-05-06 15:49:51,870 [ERROR] Unhandled Error
> Traceback (most recent call last):
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/internet/base.py", line 1201, in mainLoop
>     self.runUntilCurrent()
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/internet/base.py", line 797, in runUntilCurrent
>     f(*a, **kw)
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/internet/defer.py", line 382, in callback
>     self._startRunCallbacks(result)
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/internet/defer.py", line 490, in
> _startRunCallbacks
>     self._runCallbacks()
> --- <exception caught here> ---
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/internet/defer.py", line 577, in _runCallbacks
>     current.result = callback(current.result, *args, **kw)
>   File "/usr/local/lib/python2.7/dist-
> packages/obfsproxy-0.2.9_1_g4c41868-py2.7.egg/obfsproxy/transports/obfs3.py",
> line 154, in _uniform_dh_errback
>     self.circuit.close()
> exceptions.AttributeError: 'NoneType' object has no attribute 'close'
> }}}
> {{{
> 2014-05-06 14:47:51,643 [ERROR] Unhandled Error
> Traceback (most recent call last):
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/python/log.py", line 88, in callWithLogger
>     return callWithContext({"system": lp}, func, *args, **kw)
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/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-13.2.0-py2.7
> -linux-x86_64.egg/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-13.2.0-py2.7
> -linux-x86_64.egg/twisted/python/context.py", line 81, in callWithContext
>     return func(*args,**kw)
> --- <exception caught here> ---
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/internet/posixbase.py", line 614, in
> _doReadOrWrite
>     why = selectable.doRead()
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/internet/tcp.py", line 215, in doRead
>     return self._dataReceived(data)
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7
> -linux-x86_64.egg/twisted/internet/tcp.py", line 221, in _dataReceived
>     rval = self.protocol.dataReceived(data)
>   File "/usr/local/lib/python2.7/dist-
> packages/obfsproxy-0.2.9_1_g4c41868-py2.7.egg/obfsproxy/network/extended_orport.py",
> line 189, in dataReceived
>     self.circuit.dataReceived(self.buffer, self)
>   File "/usr/local/lib/python2.7/dist-
> packages/obfsproxy-0.2.9_1_g4c41868-py2.7.egg/obfsproxy/network/network.py",
> line 157, in dataReceived
>     self.transport.receivedUpstream(data)
>   File "/usr/local/lib/python2.7/dist-
> packages/obfsproxy-0.2.9_1_g4c41868-py2.7.egg/obfsproxy/transports/obfs3.py",
> line 102, in receivedUpstream
>     self.circuit.downstream.write(message)
> exceptions.AttributeError: 'NoneType' object has no attribute
> 'downstream'
> }}}
>
> I get around 2-3 of them per day which means that it's not a very usual
> bug.

New description:

 Since my obfs3 bridge has gotten more popular, I decided to enable logging
 and I noticed that I've been getting these errors:

 {{{
 2014-05-06 14:47:51,643 [ERROR] Unhandled Error
 Traceback (most recent call last):
   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7-linux-
 x86_64.egg/twisted/python/log.py", line 88, in callWithLogger
     return callWithContext({"system": lp}, func, *args, **kw)
   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7-linux-
 x86_64.egg/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-13.2.0-py2.7-linux-
 x86_64.egg/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-13.2.0-py2.7-linux-
 x86_64.egg/twisted/python/context.py", line 81, in callWithContext
     return func(*args,**kw)
 --- <exception caught here> ---
   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7-linux-
 x86_64.egg/twisted/internet/posixbase.py", line 614, in _doReadOrWrite
     why = selectable.doRead()
   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7-linux-
 x86_64.egg/twisted/internet/tcp.py", line 215, in doRead
     return self._dataReceived(data)
   File "/usr/local/lib/python2.7/dist-packages/Twisted-13.2.0-py2.7-linux-
 x86_64.egg/twisted/internet/tcp.py", line 221, in _dataReceived
     rval = self.protocol.dataReceived(data)
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy-0.2.9_1_g4c41868-py2.7.egg/obfsproxy/network/extended_orport.py",
 line 189, in dataReceived
     self.circuit.dataReceived(self.buffer, self)
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy-0.2.9_1_g4c41868-py2.7.egg/obfsproxy/network/network.py",
 line 157, in dataReceived
     self.transport.receivedUpstream(data)
   File "/usr/local/lib/python2.7/dist-
 packages/obfsproxy-0.2.9_1_g4c41868-py2.7.egg/obfsproxy/transports/obfs3.py",
 line 102, in receivedUpstream
     self.circuit.downstream.write(message)
 exceptions.AttributeError: 'NoneType' object has no attribute 'downstream'
 }}}

 I get around 2-3 of them per day which means that it's not a very usual
 bug.

--

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11769#comment:2>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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References:
- [tor-bugs] #11769 [Obfsproxy]: Unexpected `NoneType` in obfs3
  - From: Tor Bug Tracker & Wiki

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