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#!/usr/bin/env python
# -*- coding: ISO-8859-15 -*-
#
# Copyright (C) 2005-2007 David Guerizec <david@guerizec.net>
#
# Last modified: 2007 Dec 19, 23:21:49 by david
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import threading, socket, os.path
import paramiko
from sshproxy import get_class, log
from sshproxy.config import ConfigSection, path, get_config
class SIPCConfigSection(ConfigSection):
section_id = 'sipc'
section_defaults = {
'authorized_keys': '@authorized_keys',
'key_file': '@ipc.id_dsa',
}
types = {
'authorized_keys': path,
'key_file': path,
}
SIPCConfigSection.register()
class SSHServer(paramiko.ServerInterface):
def __init__(self, addr):
self.sock_addr = addr
paramiko.ServerInterface.__init__(self)
def check_auth_publickey(self, username, key):
pubkey = key.get_base64()
addr = self.sock_addr[0]
if username == "sshproxy-IPC":
try:
hostkey_file = get_config('sshproxy').get('hostkey_file')
hostkey = paramiko.DSSKey(filename=hostkey_file).get_base64()
auth_keys_file = get_config('sipc')['authorized_keys']
if os.path.isfile(auth_keys_file):
authorized_keys = open(auth_keys_file).readlines()
else:
authorized_keys = []
authorized_keys.append(hostkey)
if not len([ k for k in authorized_keys if pubkey in k ]):
log.error("ATTENTION: unauthorized attempt to connect "
"on IPC channel from %s@%s" % (username, addr))
return paramiko.AUTH_FAILED
except:
log.exception("SIPC: exception in check_auth_pubkey")
return paramiko.AUTH_FAILED
self.username = username
return paramiko.AUTH_SUCCESSFUL
log.error("ATTENTION: unauthorized attempt to connect "
"on IPC channel from %s@%s" % (username, addr))
return paramiko.AUTH_FAILED
def check_channel_request(self, kind, chanid):
if kind == 'sshproxy-IPC':
return paramiko.OPEN_SUCCEEDED
addr = self.sock_addr[0]
log.error("ATTENTION: unauthorized attempt to connect "
"on IPC channel type '%s' from %s@%s" %
(kind, self.username, addr))
return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED
IPCServer = get_class("IPCServer")
class SIPCServer(IPCServer):
def _sock_accept(self):
if self.sock_type == socket.AF_UNIX and self.sock_addr[0] == '\x00':
return IPCServer._sock_accept(self)
real_sock, address = self.sock.accept()
log.info("IPC: Accepting new secure client %s", address)
host_key = paramiko.DSSKey(filename="/etc/sshproxy/id_dsa")
transport = paramiko.Transport(real_sock)
transport.load_server_moduli()
transport.add_server_key(host_key)
# start the server interface
negotiation_ev = threading.Event()
transport.start_server(negotiation_ev, SSHServer(self.sock_addr))
while not negotiation_ev.isSet():
negotiation_ev.wait(0.5)
if not transport.is_active():
log.error("SIPC: SSH negotiation failed")
raise 'SSH negotiation failed'
sock = transport.accept(5)
self.real_sock = real_sock
self.transport = transport
return sock, address
def close(self):
if not (self.sock_type == socket.AF_UNIX
and self.sock_addr[0] == '\x00'):
self.transport.close()
self.real_sock.close()
IPCServer.close(self)
SIPCServer.register()
IPCClient = get_class("IPCClient")
class SIPCClient(IPCClient):
def _sock_connect(self, real_sock, sock_addr):
if self.sock_type == socket.AF_UNIX and self.sock_addr[0] == '\x00':
return IPCClient._sock_connect(self, real_sock, sock_addr)
real_sock.connect(sock_addr)
log.info("IPC: Connecting to secure server %s", sock_addr)
transport = paramiko.Transport(real_sock)
ev = threading.Event()
transport.start_client(ev)
while not ev.isSet():
ev.wait(0.5)
if not transport.is_active():
log.error("SIPC: SSH negotiation failed")
raise 'SSH negotiation failed'
ev = threading.Event()
key_file = get_config("sipc").get("key_file")
if not os.path.isfile(key_file):
key_file = get_config("sshproxy").get("hostkey_file")
key = paramiko.DSSKey(filename=key_file)
transport.auth_publickey('sshproxy-IPC', key, ev)
while not ev.isSet():
ev.wait(0.5)
if not transport.is_authenticated():
log.error("SIPC: SSH authentication failed")
raise 'SSH authentication failed'
sock = transport.open_channel('sshproxy-IPC')
self.real_sock = real_sock
self.transport = transport
return sock
def close(self):
if not (self.sock_type == socket.AF_UNIX
and self.sock_addr[0] == '\x00'):
self.transport.close()
self.real_sock.close()
IPCClient.close(self)
SIPCClient.register()
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