220 lines
7.7 KiB
Python
Executable File
220 lines
7.7 KiB
Python
Executable File
#!/usr/bin/python
|
|
|
|
# Copyright (C) 2003-2005 Robey Pointer <robey@lag.net>
|
|
#
|
|
# This file is part of paramiko.
|
|
#
|
|
# Paramiko is free software; you can redistribute it and/or modify it under the
|
|
# terms of the GNU Lesser General Public License as published by the Free
|
|
# Software Foundation; either version 2.1 of the License, or (at your option)
|
|
# any later version.
|
|
#
|
|
# Paramiko is distrubuted in the hope that it will be useful, but WITHOUT ANY
|
|
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
|
|
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
|
|
# details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License
|
|
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
|
|
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
|
|
"""
|
|
Sample script showing how to do local port forwarding over paramiko.
|
|
|
|
This script connects to the requested SSH server and sets up local port
|
|
forwarding (the openssh -L option) from a local port through a tunneled
|
|
connection to a destination reachable from the SSH server machine.
|
|
"""
|
|
|
|
import sys
|
|
import os
|
|
import socket
|
|
import select
|
|
import SocketServer
|
|
import getpass
|
|
import base64
|
|
from optparse import OptionParser
|
|
|
|
import paramiko
|
|
|
|
DEFAULT_PORT = 4000
|
|
SSH_PORT = 22
|
|
VERBOSE = True
|
|
READPASS = False
|
|
|
|
|
|
class ForwardServer (SocketServer.ThreadingTCPServer):
|
|
daemon_threads = True
|
|
allow_reuse_address = True
|
|
|
|
|
|
class Handler (SocketServer.BaseRequestHandler):
|
|
|
|
def handle(self):
|
|
try:
|
|
chan = self.ssh_transport.open_channel('direct-tcpip',
|
|
(self.chain_host, self.chain_port),
|
|
self.request.getpeername())
|
|
except Exception, e:
|
|
verbose('Incoming request to %s:%d failed: %s' % (self.chain_host,
|
|
self.chain_port,
|
|
repr(e)))
|
|
return
|
|
|
|
verbose('Connected! Tunnel open.')
|
|
while True:
|
|
r, w, x = select.select([self.request, chan], [], [])
|
|
if self.request in r:
|
|
data = self.request.recv(1024)
|
|
if len(data) == 0:
|
|
break
|
|
chan.send(data)
|
|
if chan in r:
|
|
data = chan.recv(1024)
|
|
if len(data) == 0:
|
|
break
|
|
self.request.send(data)
|
|
chan.close()
|
|
self.request.close()
|
|
verbose('Tunnel closed.')
|
|
|
|
|
|
def forward_tunnel(local_port, remote_host, remote_port, transport):
|
|
# this is a little convoluted, but lets me configure things for the Handler
|
|
# object. (SocketServer doesn't give Handlers any way to access the outer
|
|
# server normally.)
|
|
class SubHander (Handler):
|
|
chain_host = remote_host
|
|
chain_port = remote_port
|
|
ssh_transport = transport
|
|
ForwardServer(('', local_port), SubHander).serve_forever()
|
|
|
|
def find_default_key_file():
|
|
filename = os.path.expanduser('~/.ssh/id_rsa')
|
|
if os.access(filename, os.R_OK):
|
|
return filename
|
|
filename = os.path.expanduser('~/ssh/id_rsa')
|
|
if os.access(filename, os.R_OK):
|
|
return filename
|
|
filename = os.path.expanduser('~/.ssh/id_dsa')
|
|
if os.access(filename, os.R_OK):
|
|
return filename
|
|
filename = os.path.expanduser('~/ssh/id_dsa')
|
|
if os.access(filename, os.R_OK):
|
|
return filename
|
|
return ''
|
|
|
|
def verbose(s):
|
|
if VERBOSE:
|
|
print s
|
|
|
|
|
|
#####
|
|
|
|
|
|
parser = OptionParser(usage='usage: %prog [options] <remote-addr>:<remote-port>',
|
|
version='%prog 1.0')
|
|
parser.add_option('-q', '--quiet', action='store_false', dest='verbose', default=VERBOSE,
|
|
help='squelch all informational output')
|
|
parser.add_option('-l', '--local-port', action='store', type='int', dest='port',
|
|
default=DEFAULT_PORT,
|
|
help='local port to forward (default: %d)' % DEFAULT_PORT)
|
|
parser.add_option('-r', '--host', action='store', type='string', dest='ssh_host',
|
|
help='SSH host to tunnel through (required)')
|
|
parser.add_option('-p', '--port', action='store', type='int', dest='ssh_port', default=SSH_PORT,
|
|
help='SSH port to tunnel through (default: %d)' % SSH_PORT)
|
|
parser.add_option('-u', '--user', action='store', type='string', dest='user',
|
|
default=getpass.getuser(),
|
|
help='username for SSH authentication (default: %s)' % getpass.getuser())
|
|
parser.add_option('-K', '--key', action='store', type='string', dest='keyfile',
|
|
default=find_default_key_file(),
|
|
help='private key file to use for SSH authentication')
|
|
parser.add_option('', '--no-key', action='store_false', dest='use_key', default=True,
|
|
help='don\'t look for or use a private key file')
|
|
parser.add_option('-P', '--password', action='store_true', dest='readpass', default=READPASS,
|
|
help='read password (for key or password auth) from stdin')
|
|
options, args = parser.parse_args()
|
|
|
|
VERBOSE = options.verbose
|
|
READPASS = options.readpass
|
|
|
|
|
|
if len(args) != 1:
|
|
parser.error('Incorrect number of arguments.')
|
|
remote_host = args[0]
|
|
if ':' not in remote_host:
|
|
parser.error('Remote port missing.')
|
|
remote_host, remote_port = remote_host.split(':', 1)
|
|
try:
|
|
remote_port = int(remote_port)
|
|
except:
|
|
parser.error('Remote port must be a number.')
|
|
|
|
if not options.ssh_host:
|
|
parser.error('SSH host is required.')
|
|
if ':' in options.ssh_host:
|
|
options.ssh_host, options.ssh_port = options.ssh_host.split(':', 1)
|
|
try:
|
|
options.ssh_port = int(options.ssh_port)
|
|
except:
|
|
parser.error('SSH port must be a number.')
|
|
|
|
try:
|
|
host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
|
|
except IOError:
|
|
try:
|
|
host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/ssh/known_hosts'))
|
|
except IOError:
|
|
print '*** Unable to open host keys file'
|
|
host_keys = {}
|
|
|
|
if not host_keys.has_key(options.ssh_host):
|
|
print '*** Warning: no host key for %s' % options.ssh_host
|
|
expected_host_key_type = None
|
|
expected_host_key = None
|
|
else:
|
|
expected_host_key_type = host_keys[options.ssh_host].keys()[0]
|
|
expected_host_key = host_keys[options.ssh_host][expected_host_key_type]
|
|
|
|
key = None
|
|
password = None
|
|
if options.use_key:
|
|
try:
|
|
key = paramiko.RSAKey.from_private_key_file(options.keyfile)
|
|
except paramiko.PasswordRequiredException:
|
|
if not READPASS:
|
|
print '*** Password needed for keyfile (use -P): %s' % options.keyfile
|
|
sys.exit(1)
|
|
key_password = getpass.getpass('Enter password for key: ')
|
|
try:
|
|
key = paramiko.RSAKey.from_private_key_file(options.keyfile, key_password)
|
|
except:
|
|
print '*** Unable to read keyfile: %s' % options.keyfile
|
|
sys.exit(1)
|
|
except:
|
|
pass
|
|
|
|
if key is None:
|
|
# try reading a password then
|
|
if not READPASS:
|
|
print '*** Either a valid private key or password is required (use -K or -P).'
|
|
sys.exit(1)
|
|
password = getpass.getpass('Enter password: ')
|
|
|
|
verbose('Connecting to ssh host %s:%d ...' % (options.ssh_host, options.ssh_port))
|
|
|
|
transport = paramiko.Transport((options.ssh_host, options.ssh_port))
|
|
transport.connect(hostkeytype=expected_host_key_type,
|
|
hostkey=expected_host_key,
|
|
username=options.user,
|
|
password=password,
|
|
pkey=key)
|
|
|
|
verbose('Now forwarding port %d to %s:%d ...' % (options.port, remote_host, remote_port))
|
|
|
|
try:
|
|
forward_tunnel(options.port, remote_host, remote_port, transport)
|
|
except KeyboardInterrupt:
|
|
print 'Port forwarding stopped.'
|
|
sys.exit(0)
|