[Twisted-Python] twisted python conch SSH shell?

[Eli Criffield]

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http://twistedmatrix.com/pipermail/twisted-python/2007-July/015793.html

Eli Criffield

On Tue, Aug 12, 2008 at 3:40 PM, Bill Zeller <wzeller at cs.princeton.edu> wrote:
> Hi,
>
> I've been playing around with Twisted's Conch client (which looks extremely
> well done, thanks!). I've been able to connect to a conch server and also
> connect to other ssh servers and execuate various commands. I'd like to be
> able to connect to an arbitrary SSH server and run /bin/bash.
>
> I'm able to execute a command like so:
>
> ---------------------
> class CommandChannel(channel.SSHChannel):
>     ....
>     def channelOpen(self, data):
>         self.conn.sendRequest(
>             self, 'exec', common.NS(self.command),
> wantReply=True).addCallback(
>             self._gotResponse)
> ---------------------
>
> Looking through the SSH spec (connect protocol, rfc4254), it looks like
> shells are opened with this command.
>
> ---------------------
>
>       byte      SSH_MSG_CHANNEL_REQUEST
>
>       uint32    recipient channel
>       string    "shell"
>       boolean   want reply
>
> ---------------------
>
> It doesn't look like Conch supports these requests (here's how
> CHANNEL_REQUESTs are currently sent out)
>
> ---------------------
> (Twisted-8.1.0)
> twisted/conch/ssh/connection.py (413):
>         self.transport.sendPacket(MSG_CHANNEL_REQUEST, struct.pack('>L',
>                                     self.channelsToRemoteChannel[channel])
>                                   + common.NS(requestType)+chr(wantReply)
>                                   + data)
> ---------------------
>
> I may be misunderstanding how remote shells are started, so any help would
> be appreciated.
>
> Again, I'm trying to launch an interactive /bin/bash shell from a Conch SSH
> client on an arbitrary remote SSH server.
>
> Thanks for your time.
>
> Best Regards,
> Bill Zeller
>
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