[BangPypers] Multilevel SSH in Python (davidsnt)

[davidsnt]

Great post, really a wonderful tip.

Thank you.
Davidsanthosh L


On Wed, Oct 17, 2012 at 7:08 PM, Philippe May <phil.nabble at hanjinet.org>wrote:

> Noufal's suggestion is great (as usual).
>
> Twisted might be a valid alternative as it give access to the full
> protocol stacks and lets you plug in what you need in pure python (see the
> connection object below).
>
> This recent talk seems also to be related to this topic (long video):
> http://www.youtube.com/watch?**v=DUm-ZBEmVUE<http://www.youtube.com/watch?v=DUm-ZBEmVUE>
>
> Philippe
>
>
> import sys
> import os
> from twisted.conch import error
> from twisted.internet import defer
> from twisted.conch.ssh import transport, connection
> from twisted.conch.ssh import keys, userauth
> from twisted.conch.ssh import channel, common
> from twisted.internet import protocol, reactor
> from twisted.python import log
>
> class ClientTransport(transport.**SSHClientTransport):
>     def verifyHostKey(self, pubKey, fingerprint):
>         ## If you want to verify the host key:
>         #if fingerprint != "e8:68:7a:7a:a2:5e:fd:fa:94:**
> f5:c8:2a:c1:10:80:5b":
>         #    return defer.fail(error.ConchError('**bad key'))
>         #else:
>         #    return defer.succeed(1)
>         return defer.succeed(True)
>
>     def connectionSecure(self):
>         self.requestService(**ClientUserAuth(os.getlogin(),
> ClientConnection()))
>
>
>
> class ClientUserAuth(userauth.**SSHUserAuthClient):
>     publicKey = keys.Key.fromFile(os.path.**join(os.path.expanduser("~"),
> ".ssh", "id_dsa.pub"))
>     privateKey = keys.Key.fromFile(os.path.**join(os.path.expanduser("~"),
> ".ssh", "id_dsa"))
>
>     def getPassword(self, prompt = None):
>         return
>         # this says we won't do password authentication
>
>     def getPublicKey(self):
>         return self.publicKey
>
>     def getPrivateKey(self):
>         return defer.succeed(self.privateKey)
>
>
> class ClientConnection(connection.**SSHConnection):
>
>     def serviceStarted(self):
>         self.openChannel(CatChannel(**conn = self))
>
>
>
> class CatChannel(channel.SSHChannel)**:
>
>     name = 'session'
>
>     def channelOpen(self, data):
>         d = self.conn.sendRequest(self, 'exec', common.NS('cat'),
> wantReply = 1)
>         d.addCallback(self._**cbSendRequest)
>         self.catData = ''
>
>     def _cbSendRequest(self, ignored):
>         self.write('This data will be echoed back to us by "cat."')
>
>     def dataReceived(self, data):
>         self.catData += data
>         self.loseConnection()
>
>     def closed(self):
>         print 'We got this from "cat":', self.catData
>         reactor.stop()
>
>
>
> def main():
>     factory = protocol.ClientFactory()
>     factory.protocol = ClientTransport
>     reactor.connectTCP('localhost'**, 22, factory)
>     ## Log all to stdout
>     log.startLogging(sys.stdout, setStdout=0)
>     reactor.run()
>
> if __name__ == "__main__":
>     main()
>
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