Re: key re-exchange problem?

Hi Sascha,
First, thanks a lot for the reply.

Unfortunately, I'm not sure if the bug I'm seeing is addressed by this 
patch.  The patch fixes a key re-exchange problem that happens when over 
1 GB of data is transfered over the stream.  In my case, the problem 
seem to happen randomly, way before 1 GB is actually transfered on the 
stream.

One thing I noticed in the debug output I attached is that it seems the 
server sends a bit of data after the client sent the inital 
SSH_MSG_KEXINIT message.  Maybe this is a scenario that does not happen 
often and might trigger a bug in the client.  (for example, maybe the 
client expects the server to send the SSH_MSG_KEXINIT reply right away, 
but in some cases the server still has some data to send before sending 
the SSH_MSG_KEXINIT reply).

 From the rfc4253 draft:

"Note, however, that during a key re-exchange, after sending a 
SSH_MSG_KEXINIT message, each party MUST be prepared to process an 
arbitrary number of messages that my be in-flight before receiving a 
SSH_MSG_KEXINIT message from the other party."

Since the problem happens very randomly, it is very difficult to 
reproduce on demand, which makes debugging of the problem difficult.  I 
will look in the code to see if i can find where it is failing...


Thanks again,
    Andre

Sascha Hunold wrote:
> Andre Charbonneau wrote:
>   
>> I have a problem with sshtools where the connection is being closed
>> and I get a protocol error.  According to the debug output, it looks
>> like this occurs during key re-exchange.
>>     
> I guess you are using version 0.2.7 or prior.
>
> The patches section contains a fix.
> I think it's this one here
> http://sourceforge.net/tracker/index.php?func=detail&aid=898106&group_id=60894&atid=495564
>
> You can find my personal patches at
> http://capivara.sourceforge.net/?SSHTools
>
> Hope this helps!
>
> Cheers
>
> Sascha
>
>
>
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-- 
Andre Charbonneau

100 Sussex Drive, Rm 2025
Research Computing Support, IMSB
National Research Council Canada
Ottawa, ON, Canada K1A 0R6
613-993-3129  Fax: 613-993-3127     



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