[Twisted-Python] failure to connect to sshsimpleserver.py

Glen Mabey glen.mabey at swri.org
Tue Sep 23 17:58:48 EDT 2008


I'm just starting to use twisted (having quickly read through the book  
"Twisted: Network Programming Essentials"), and I am unable to  
successfully use one of the example scripts:  doc/conch/examples/ 
sshsimpleserver.py .

I am using python 2.5.2 and today's svn of twisted and pycrypto on  
RedHat AS5 x84-64.  I experienced similar results with 8.1.0 .

I am able to start the server with no problem, but when I start a  
client that connects to it, I get:

2008-09-23 21:51:08+0000 [-] Log opened.
2008-09-23 21:51:08+0000 [-] __main__.ExampleFactory starting on 5022
2008-09-23 21:51:08+0000 [-] Starting factory <__main__.ExampleFactory  
instance at 0x17e60a28>
2008-09-23 21:51:10+0000 [__main__.ExampleFactory] disabling diffie- 
hellman-group-exchange because we cannot find moduli file
2008-09-23 21:51:10+0000 [SSHServerTransport,0,] kex alg, key  
alg: diffie-hellman-group1-sha1 ssh-rsa
2008-09-23 21:51:10+0000 [SSHServerTransport,0,] outgoing:  
aes256-ctr hmac-sha1 none
2008-09-23 21:51:10+0000 [SSHServerTransport,0,] incoming:  
aes256-ctr hmac-sha1 none
2008-09-23 21:51:10+0000 [SSHServerTransport,0,] Unhandled  
	Traceback (most recent call last):
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/python/log.py", line 51, in  
	    return callWithContext({"system": lp}, func, *args, **kw)
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/python/log.py", line 36, in  
	    return context.call({ILogContext: newCtx}, func, *args, **kw)
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/python/context.py", line 59, in  
	    return self.currentContext().callWithContext(ctx, func, *args,  
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/python/context.py", line 37, in  
	    return func(*args,**kw)
	--- <exception caught here> ---
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/internet/selectreactor.py", line 146,  
in _doReadOrWrite
	    why = getattr(selectable, method)()
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/internet/tcp.py", line 463, in doRead
	    return self.protocol.dataReceived(data)
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/conch/ssh/transport.py", line 314, in  
	    self.dispatchMessage(messageNum, packet[1:])
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/conch/ssh/transport.py", line 329, in  
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/conch/ssh/transport.py", line 740, in  
	  File "/usr/DiamondBack/stow/twisted-20080923_svn-py2.5/lib/ 
python2.5/site-packages/twisted/conch/ssh/keys.py", line 659, in sign
	    signature = self.keyObject.sign(digest, '')[0]
	  File "/usr/DiamondBack/stow/pycrypto-20080923_git-py2.5/lib/ 
python2.5/site-packages/Crypto/PublicKey/pubkey.py", line 76, in sign
	    return self._sign(M, K)
	exceptions.TypeError: _sign() takes exactly 2 arguments (3 given)
2008-09-23 21:51:10+0000 [SSHServerTransport,0,] connection  

I have tried starting the client both as 'ssh localhost -p 5022' as  
well as running the sshsimpleclient.py script with the same results.

I have also tried connecting from a different host into the server,  
with the same results.

Any help in resolving this issue and realizing a working example of an  
ssh server would be greatly appreciated.

Thank you,
Glen Mabey

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