[Twisted-Python] twisted.conch.ssh.session.SSHSession.request_subsystem

Hi all, I've managed to come up with a minimal sftp server implementation which able to auth users using rsa_key the code is available at: http://gist.github.com/37446 The point is that I am missing the knowledge needed in order to add path control. That is, controlling which path(s) a user can access. at http://twisted.conch.ssh.session.SSHSession.html#request_subsystem it appears to be undocumented Would love to get some references, samples, etc. Thanks in advance, Tzury