add a demo for reverse port forwarding.
This commit is contained in:
Robey Pointer
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#!/usr/bin/env python
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# Copyright (C) 2008 Robey Pointer <robey@lag.net>
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#
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# This file is part of paramiko.
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#
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# Paramiko is free software; you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation; either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# Paramiko is distrubuted in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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"""
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Sample script showing how to do remote port forwarding over paramiko.
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This script connects to the requested SSH server and sets up remote port
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forwarding (the openssh -R option) from a remote port through a tunneled
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connection to a destination reachable from the local machine.
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"""
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import getpass
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import os
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import socket
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import select
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import sys
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import threading
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from optparse import OptionParser
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import paramiko
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SSH_PORT = 22
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DEFAULT_PORT = 4000
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g_verbose = True
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def handler(chan, host, port):
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sock = socket.socket()
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try:
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sock.connect((host, port))
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except Exception, e:
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verbose('Forwarding request to %s:%d failed: %r' % (host, port, e))
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return
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verbose('Connected! Tunnel open %r -> %r -> %r' % (chan.origin_addr,
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chan.getpeername(), (host, port)))
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while True:
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r, w, x = select.select([sock, chan], [], [])
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if sock in r:
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data = sock.recv(1024)
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if len(data) == 0:
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break
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chan.send(data)
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if chan in r:
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data = chan.recv(1024)
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if len(data) == 0:
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break
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sock.send(data)
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chan.close()
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sock.close()
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verbose('Tunnel closed from %r' % (chan.origin_addr,))
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def reverse_forward_tunnel(server_port, remote_host, remote_port, transport):
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transport.request_port_forward('', server_port)
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while True:
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chan = transport.accept(1000)
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if chan is None:
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continue
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thr = threading.Thread(target=handler, args=(chan, remote_host, remote_port))
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thr.setDaemon(True)
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thr.start()
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def verbose(s):
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if g_verbose:
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print s
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HELP = """\
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Set up a reverse forwarding tunnel across an SSH server, using paramiko. A
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port on the SSH server (given with -p) is forwarded across an SSH session
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back to the local machine, and out to a remote site reachable from this
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network. This is similar to the openssh -R option.
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"""
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def get_host_port(spec, default_port):
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"parse 'hostname:22' into a host and port, with the port optional"
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args = (spec.split(':', 1) + [default_port])[:2]
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args[1] = int(args[1])
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return args[0], args[1]
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def parse_options():
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global g_verbose
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parser = OptionParser(usage='usage: %prog [options] <ssh-server>[:<server-port>]',
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version='%prog 1.0', description=HELP)
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parser.add_option('-q', '--quiet', action='store_false', dest='verbose', default=True,
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help='squelch all informational output')
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parser.add_option('-p', '--remote-port', action='store', type='int', dest='port',
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default=DEFAULT_PORT,
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help='port on server to forward (default: %d)' % DEFAULT_PORT)
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parser.add_option('-u', '--user', action='store', type='string', dest='user',
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default=getpass.getuser(),
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help='username for SSH authentication (default: %s)' % getpass.getuser())
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parser.add_option('-K', '--key', action='store', type='string', dest='keyfile',
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default=None,
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help='private key file to use for SSH authentication')
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parser.add_option('', '--no-key', action='store_false', dest='look_for_keys', default=True,
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help='don\'t look for or use a private key file')
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parser.add_option('-P', '--password', action='store_true', dest='readpass', default=False,
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help='read password (for key or password auth) from stdin')
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parser.add_option('-r', '--remote', action='store', type='string', dest='remote', default=None, metavar='host:port',
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help='remote host and port to forward to')
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options, args = parser.parse_args()
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if len(args) != 1:
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parser.error('Incorrect number of arguments.')
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if options.remote is None:
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parser.error('Remote address required (-r).')
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g_verbose = options.verbose
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server_host, server_port = get_host_port(args[0], SSH_PORT)
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remote_host, remote_port = get_host_port(options.remote, SSH_PORT)
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return options, (server_host, server_port), (remote_host, remote_port)
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def main():
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options, server, remote = parse_options()
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password = None
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if options.readpass:
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password = getpass.getpass('Enter SSH password: ')
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client = paramiko.SSHClient()
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client.load_system_host_keys()
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client.set_missing_host_key_policy(paramiko.WarningPolicy())
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verbose('Connecting to ssh host %s:%d ...' % (server[0], server[1]))
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try:
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client.connect(server[0], server[1], username=options.user, key_filename=options.keyfile,
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look_for_keys=options.look_for_keys, password=password)
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except Exception, e:
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print '*** Failed to connect to %s:%d: %r' % (server[0], server[1], e)
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sys.exit(1)
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verbose('Now forwarding remote port %d to %s:%d ...' % (options.port, remote[0], remote[1]))
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try:
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reverse_forward_tunnel(options.port, remote[0], remote[1], client.get_transport())
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except KeyboardInterrupt:
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print 'C-c: Port forwarding stopped.'
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sys.exit(0)
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if __name__ == '__main__':
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main()
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