root / vncauthproxy / proxy.py @ 7eb27319
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#!/usr/bin/env python
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"""
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vncauthproxy - a VNC authentication proxy
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"""
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#
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# Copyright (c) 2010-2011 Greek Research and Technology Network S.A.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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DEFAULT_CTRL_SOCKET = "/var/run/vncauthproxy/ctrl.sock"
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DEFAULT_LOG_FILE = "/var/log/vncauthproxy/vncauthproxy.log"
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DEFAULT_PID_FILE = "/var/run/vncauthproxy/vncauthproxy.pid"
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DEFAULT_CONNECT_TIMEOUT = 30
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DEFAULT_CONNECT_RETRIES = 3
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DEFAULT_RETRY_WAIT = 0.1
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# Default values per http://www.iana.org/assignments/port-numbers
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DEFAULT_MIN_PORT = 49152
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DEFAULT_MAX_PORT = 65535
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import os |
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import sys |
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import logging |
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import gevent |
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import daemon |
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import random |
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import daemon.pidlockfile |
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import rfb |
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try:
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import simplejson as json |
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except ImportError: |
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import json |
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from gevent import socket |
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from signal import SIGINT, SIGTERM |
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from gevent import signal |
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from gevent.select import select |
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from time import sleep |
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logger = None
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# Currently, gevent uses libevent-dns for asynchornous DNS resolution,
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# which opens a socket upon initialization time. Since we can't get the fd
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# reliably, We have to maintain all file descriptors open (which won't harm
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# anyway)
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class AllFilesDaemonContext(daemon.DaemonContext): |
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"""DaemonContext class keeping all file descriptors open"""
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def _get_exclude_file_descriptors(self): |
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class All: |
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def __contains__(self, value): |
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return True |
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return All()
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class VncAuthProxy(gevent.Greenlet): |
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"""
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Simple class implementing a VNC Forwarder with MITM authentication as a
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Greenlet
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VncAuthProxy forwards VNC traffic from a specified port of the local host
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to a specified remote host:port. Furthermore, it implements VNC
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Authentication, intercepting the client/server handshake and asking the
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client for authentication even if the backend requires none.
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It is primarily intended for use in virtualization environments, as a VNC
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``switch''.
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"""
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id = 1
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def __init__(self, logger, listeners, pool, daddr, dport, server, password, connect_timeout): |
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"""
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@type logger: logging.Logger
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@param logger: the logger to use
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@type listeners: list
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@param listeners: list of listening sockets to use for client connections
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@type pool: list
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@param pool: if not None, return the client port number into this port pool
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@type daddr: str
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@param daddr: destination address (IPv4, IPv6 or hostname)
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@type dport: int
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@param dport: destination port
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@type server: socket
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@param server: VNC server socket
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@type password: str
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@param password: password to request from the client
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@type connect_timeout: int
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@param connect_timeout: how long to wait for client connections
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(seconds)
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"""
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gevent.Greenlet.__init__(self)
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self.id = VncAuthProxy.id
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VncAuthProxy.id += 1
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self.log = logger
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self.listeners = listeners
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# All listening sockets are assumed to be on the same port
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self.sport = listeners[0].getsockname()[1] |
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self.pool = pool
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self.daddr = daddr
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self.dport = dport
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self.server = server
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self.password = password
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self.client = None |
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self.timeout = connect_timeout
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def _cleanup(self): |
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"""Close all active sockets and exit gracefully"""
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# Reintroduce the port number of the client socket in
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# the port pool, if applicable.
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if not self.pool is None: |
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self.pool.append(self.sport) |
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self.log.debug("Returned port %d to port pool, contains %d ports", |
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self.sport, len(self.pool)) |
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while self.listeners: |
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self.listeners.pop().close()
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if self.server: |
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self.server.close()
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if self.client: |
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self.client.close()
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raise gevent.GreenletExit
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def info(self, msg): |
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self.log.info("[C%d] %s" % (self.id, msg)) |
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def debug(self, msg): |
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self.log.debug("[C%d] %s" % (self.id, msg)) |
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def warn(self, msg): |
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self.log.warn("[C%d] %s" % (self.id, msg)) |
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def error(self, msg): |
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self.log.error("[C%d] %s" % (self.id, msg)) |
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def critical(self, msg): |
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self.log.critical("[C%d] %s" % (self.id, msg)) |
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def __str__(self): |
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return "VncAuthProxy: %d -> %s:%d" % (self.sport, self.daddr, self.dport) |
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def _forward(self, source, dest): |
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"""
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Forward traffic from source to dest
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@type source: socket
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@param source: source socket
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@type dest: socket
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@param dest: destination socket
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"""
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while True: |
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d = source.recv(16384)
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if d == '': |
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if source == self.client: |
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self.info("Client connection closed") |
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else:
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self.info("Server connection closed") |
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break
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dest.sendall(d) |
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# No need to close the source and dest sockets here.
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# They are owned by and will be closed by the original greenlet.
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def _client_handshake(self): |
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"""
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Perform handshake/authentication with a connecting client
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Outline:
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1. Client connects
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2. We fake RFB 3.8 protocol and require VNC authentication [also supports RFB 3.3]
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3. Client accepts authentication method
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4. We send an authentication challenge
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5. Client sends the authentication response
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6. We check the authentication
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Upon return, self.client socket is connected to the client.
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"""
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self.client.send(rfb.RFB_VERSION_3_8 + "\n") |
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client_version_str = self.client.recv(1024) |
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client_version = rfb.check_version(client_version_str) |
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if not client_version: |
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self.error("Invalid version: %s" % client_version_str) |
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raise gevent.GreenletExit
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# Both for RFB 3.3 and 3.8
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self.debug("Requesting authentication") |
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auth_request = rfb.make_auth_request(rfb.RFB_AUTHTYPE_VNC, |
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version=client_version) |
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self.client.send(auth_request)
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# The client gets to propose an authtype only for RFB 3.8
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if client_version == rfb.RFB_VERSION_3_8:
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res = self.client.recv(1024) |
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type = rfb.parse_client_authtype(res) |
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if type == rfb.RFB_AUTHTYPE_ERROR:
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self.warn("Client refused authentication: %s" % res[1:]) |
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else:
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self.debug("Client requested authtype %x" % type) |
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if type != rfb.RFB_AUTHTYPE_VNC: |
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self.error("Wrong auth type: %d" % type) |
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self.client.send(rfb.to_u32(rfb.RFB_AUTH_ERROR))
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raise gevent.GreenletExit
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# Generate the challenge
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challenge = os.urandom(16)
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self.client.send(challenge)
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response = self.client.recv(1024) |
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if len(response) != 16: |
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self.error("Wrong response length %d, should be 16" % len(response)) |
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raise gevent.GreenletExit
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if rfb.check_password(challenge, response, self.password): |
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self.debug("Authentication successful!") |
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else:
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self.warn("Authentication failed") |
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self.client.send(rfb.to_u32(rfb.RFB_AUTH_ERROR))
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raise gevent.GreenletExit
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# Accept the authentication
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self.client.send(rfb.to_u32(rfb.RFB_AUTH_SUCCESS))
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def _run(self): |
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try:
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self.log.debug("Waiting for client to connect") |
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rlist, _, _ = select(self.listeners, [], [], timeout=self.timeout) |
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if not rlist: |
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self.info("Timed out, no connection after %d sec" % self.timeout) |
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raise gevent.GreenletExit
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for sock in rlist: |
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self.client, addrinfo = sock.accept()
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self.info("Connection from %s:%d" % addrinfo[:2]) |
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# Close all listening sockets, we only want a one-shot connection
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# from a single client.
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while self.listeners: |
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self.listeners.pop().close()
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break
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# Perform RFB handshake with the client.
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self._client_handshake()
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# Bridge both connections through two "forwarder" greenlets.
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self.workers = [gevent.spawn(self._forward, self.client, self.server), |
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gevent.spawn(self._forward, self.server, self.client)] |
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# If one greenlet goes, the other has to go too.
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self.workers[0].link(self.workers[1]) |
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self.workers[1].link(self.workers[0]) |
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gevent.joinall(self.workers)
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del self.workers |
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raise gevent.GreenletExit
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except Exception, e: |
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# Any unhandled exception in the previous block
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# is an error and must be logged accordingly
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if not isinstance(e, gevent.GreenletExit): |
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self.log.exception(e)
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raise e
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finally:
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self._cleanup()
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def fatal_signal_handler(signame): |
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logger.info("Caught %s, will raise SystemExit" % signame)
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raise SystemExit |
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def get_listening_sockets(sport): |
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sockets = [] |
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# Use two sockets, one for IPv4, one for IPv6. IPv4-to-IPv6 mapped
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# addresses do not work reliably everywhere (under linux it may have
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# been disabled in /proc/sys/net/ipv6/bind_ipv6_only).
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for res in socket.getaddrinfo(None, sport, socket.AF_UNSPEC, |
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socket.SOCK_STREAM, 0, socket.AI_PASSIVE):
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af, socktype, proto, canonname, sa = res |
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try:
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s = None
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s = socket.socket(af, socktype, proto) |
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if af == socket.AF_INET6:
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# Bind v6 only when AF_INET6, otherwise either v4 or v6 bind
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# will fail.
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s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 1)
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s.bind(sa) |
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s.listen(1)
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sockets.append(s) |
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logger.debug("Listening on %s:%d" % sa[:2]) |
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except socket.error, msg:
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logger.error("Error binding to %s:%d: %s" %
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(sa[0], sa[1], msg[1])) |
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if s:
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s.close() |
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while sockets:
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sockets.pop().close() |
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# Make sure we fail immediately if we cannot get a socket
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raise msg
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return sockets
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def perform_server_handshake(daddr, dport, tries, retry_wait): |
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"""
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Initiate a connection with the backend server and perform basic
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RFB 3.8 handshake with it.
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Returns a socket connected to the backend server.
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"""
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server = None
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while tries:
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tries -= 1
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# Initiate server connection
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for res in socket.getaddrinfo(daddr, dport, socket.AF_UNSPEC, |
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socket.SOCK_STREAM, 0, socket.AI_PASSIVE):
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af, socktype, proto, canonname, sa = res |
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try:
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server = socket.socket(af, socktype, proto) |
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except socket.error, msg:
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server = None
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continue
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try:
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logger.debug("Connecting to %s:%s" % sa[:2]) |
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server.connect(sa) |
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logger.debug("Connection to %s:%s successful" % sa[:2]) |
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except socket.error, msg:
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server.close() |
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server = None
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continue
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# We succesfully connected to the server
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tries = 0
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break
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# Wait and retry
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sleep(retry_wait) |
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if server is None: |
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raise Exception("Failed to connect to server") |
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version = server.recv(1024)
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if not rfb.check_version(version): |
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raise Exception("Unsupported RFB version: %s" % version.strip()) |
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server.send(rfb.RFB_VERSION_3_8 + "\n")
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res = server.recv(1024)
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types = rfb.parse_auth_request(res) |
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if not types: |
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raise Exception("Error handshaking with the server") |
372 |
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else:
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logger.debug("Supported authentication types: %s" %
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" ".join([str(x) for x in types])) |
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if rfb.RFB_AUTHTYPE_NONE not in types: |
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raise Exception("Error, server demands authentication") |
379 |
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server.send(rfb.to_u8(rfb.RFB_AUTHTYPE_NONE)) |
381 |
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# Check authentication response
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res = server.recv(4)
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res = rfb.from_u32(res) |
385 |
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if res != 0: |
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raise Exception("Authentication error") |
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return server
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def parse_arguments(args): |
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from optparse import OptionParser |
393 |
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parser = OptionParser() |
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parser.add_option("-s", "--socket", dest="ctrl_socket", |
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default=DEFAULT_CTRL_SOCKET, |
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metavar="PATH",
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help="UNIX socket path for control connections (default: %s" %
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DEFAULT_CTRL_SOCKET) |
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parser.add_option("-d", "--debug", action="store_true", dest="debug", |
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help="Enable debugging information")
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parser.add_option("-l", "--log", dest="log_file", |
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default=DEFAULT_LOG_FILE, |
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metavar="FILE",
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help="Write log to FILE instead of %s" % DEFAULT_LOG_FILE),
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parser.add_option('--pid-file', dest="pid_file", |
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default=DEFAULT_PID_FILE, |
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metavar='PIDFILE',
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help="Save PID to file (default: %s)" %
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DEFAULT_PID_FILE) |
411 |
parser.add_option("-t", "--connect-timeout", dest="connect_timeout", |
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default=DEFAULT_CONNECT_TIMEOUT, type="int", metavar="SECONDS", |
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help="How long to listen for clients to forward")
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parser.add_option("-r", "--connect-retries", dest="connect_retries", |
415 |
default=DEFAULT_CONNECT_RETRIES, type="int",
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metavar="RETRIES",
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help="How many times to try to connect to the server")
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parser.add_option("-w", "--retry-wait", dest="retry_wait", |
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default=DEFAULT_RETRY_WAIT, type="float", metavar="SECONDS", |
420 |
help="How long to wait between retrying to connect to the server")
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parser.add_option("-p", "--min-port", dest="min_port", |
422 |
default=DEFAULT_MIN_PORT, type="int", metavar="MIN_PORT", |
423 |
help="The minimum port to use for automatically-allocated ephemeral ports")
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parser.add_option("-P", "--max-port", dest="max_port", |
425 |
default=DEFAULT_MAX_PORT, type="int", metavar="MAX_PORT", |
426 |
help="The minimum port to use for automatically-allocated ephemeral ports")
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427 |
|
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return parser.parse_args(args)
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429 |
|
430 |
|
431 |
def main(): |
432 |
"""Run the daemon from the command line."""
|
433 |
|
434 |
(opts, args) = parse_arguments(sys.argv[1:])
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435 |
|
436 |
# Create pidfile
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437 |
pidf = daemon.pidlockfile.TimeoutPIDLockFile( |
438 |
opts.pid_file, 10)
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439 |
|
440 |
# Initialize logger
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441 |
lvl = logging.DEBUG if opts.debug else logging.INFO |
442 |
|
443 |
global logger
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444 |
logger = logging.getLogger("vncauthproxy")
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445 |
logger.setLevel(lvl) |
446 |
formatter = logging.Formatter("%(asctime)s %(module)s[%(process)d] %(levelname)s: %(message)s",
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447 |
"%Y-%m-%d %H:%M:%S")
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448 |
handler = logging.FileHandler(opts.log_file) |
449 |
handler.setFormatter(formatter) |
450 |
logger.addHandler(handler) |
451 |
|
452 |
# Become a daemon:
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453 |
# Redirect stdout and stderr to handler.stream to catch
|
454 |
# early errors in the daemonization process [e.g., pidfile creation]
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# which will otherwise go to /dev/null.
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daemon_context = AllFilesDaemonContext( |
457 |
pidfile=pidf, |
458 |
umask=0022,
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stdout=handler.stream, |
460 |
stderr=handler.stream, |
461 |
files_preserve=[handler.stream]) |
462 |
daemon_context.open() |
463 |
logger.info("Became a daemon")
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464 |
|
465 |
# A fork() has occured while daemonizing,
|
466 |
# we *must* reinit gevent
|
467 |
gevent.reinit() |
468 |
|
469 |
if os.path.exists(opts.ctrl_socket):
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470 |
logger.critical("Socket '%s' already exists" % opts.ctrl_socket)
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sys.exit(1)
|
472 |
|
473 |
# TODO: make this tunable? chgrp as well?
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old_umask = os.umask(0007)
|
475 |
|
476 |
ctrl = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) |
477 |
ctrl.bind(opts.ctrl_socket) |
478 |
|
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os.umask(old_umask) |
480 |
|
481 |
ctrl.listen(1)
|
482 |
logger.info("Initialized, waiting for control connections at %s" %
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483 |
opts.ctrl_socket) |
484 |
|
485 |
# Catch signals to ensure graceful shutdown,
|
486 |
# e.g., to make sure the control socket gets unlink()ed.
|
487 |
#
|
488 |
# Uses gevent.signal so the handler fires even during
|
489 |
# gevent.socket.accept()
|
490 |
gevent.signal(SIGINT, fatal_signal_handler, "SIGINT")
|
491 |
gevent.signal(SIGTERM, fatal_signal_handler, "SIGTERM")
|
492 |
|
493 |
# Init ephemeral port pool
|
494 |
ports = range(opts.min_port, opts.max_port + 1) |
495 |
|
496 |
while True: |
497 |
try:
|
498 |
client, addr = ctrl.accept() |
499 |
logger.info("New control connection")
|
500 |
|
501 |
# Receive and parse a client request.
|
502 |
response = { |
503 |
"source_port": 0, |
504 |
"status": "FAILED" |
505 |
} |
506 |
try:
|
507 |
# TODO: support multiple forwardings in the same message?
|
508 |
#
|
509 |
# Control request, in JSON:
|
510 |
#
|
511 |
# {
|
512 |
# "source_port": <source port or 0 for automatic allocation>,
|
513 |
# "destination_address": <destination address of backend server>,
|
514 |
# "destination_port": <destination port>
|
515 |
# "password": <the password to use for MITM authentication of clients>
|
516 |
# }
|
517 |
#
|
518 |
# The <password> is used for MITM authentication of clients
|
519 |
# connecting to <source_port>, who will subsequently be forwarded
|
520 |
# to a VNC server at <destination_address>:<destination_port>
|
521 |
#
|
522 |
# Control reply, in JSON:
|
523 |
# {
|
524 |
# "source_port": <the allocated source port>
|
525 |
# "status": <one of "OK" or "FAILED">
|
526 |
# }
|
527 |
buf = client.recv(1024)
|
528 |
req = json.loads(buf) |
529 |
|
530 |
sport_orig = int(req['source_port']) |
531 |
daddr = req['destination_address']
|
532 |
dport = int(req['destination_port']) |
533 |
password = req['password']
|
534 |
except Exception, e: |
535 |
logger.warn("Malformed request: %s" % buf)
|
536 |
client.send(json.dumps(response)) |
537 |
client.close() |
538 |
continue
|
539 |
|
540 |
# Spawn a new Greenlet to service the request.
|
541 |
server = None
|
542 |
try:
|
543 |
# If the client has so indicated, pick an ephemeral source port
|
544 |
# randomly, and remove it from the port pool.
|
545 |
if sport_orig == 0: |
546 |
sport = random.choice(ports) |
547 |
ports.remove(sport) |
548 |
logger.debug("Got port %d from port pool, contains %d ports",
|
549 |
sport, len(ports))
|
550 |
pool = ports |
551 |
else:
|
552 |
sport = sport_orig |
553 |
pool = None
|
554 |
|
555 |
listeners = get_listening_sockets(sport) |
556 |
server = perform_server_handshake(daddr, dport, |
557 |
opts.connect_retries, opts.retry_wait) |
558 |
|
559 |
VncAuthProxy.spawn(logger, listeners, pool, daddr, dport, |
560 |
server, password, opts.connect_timeout) |
561 |
|
562 |
logger.info("New forwarding [%d (req'd by client: %d) -> %s:%d]" %
|
563 |
(sport, sport_orig, daddr, dport)) |
564 |
response = { |
565 |
"source_port": sport,
|
566 |
"status": "OK" |
567 |
} |
568 |
except IndexError: |
569 |
logger.error("FAILED forwarding, out of ports for [req'd by "
|
570 |
"client: %d -> %s:%d]" % (sport_orig, daddr, dport))
|
571 |
except Exception, msg: |
572 |
logger.error(msg) |
573 |
logger.error("FAILED forwarding [%d (req'd by client: %d) -> %s:%d]" %
|
574 |
(sport, sport_orig, daddr, dport)) |
575 |
if not pool is None: |
576 |
pool.append(sport) |
577 |
logger.debug("Returned port %d to port pool, contains %d ports",
|
578 |
sport, len(pool))
|
579 |
if not server is None: |
580 |
server.close() |
581 |
finally:
|
582 |
client.send(json.dumps(response)) |
583 |
client.close() |
584 |
except Exception, e: |
585 |
logger.exception(e) |
586 |
continue
|
587 |
except SystemExit: |
588 |
break
|
589 |
|
590 |
logger.info("Unlinking control socket at %s" %
|
591 |
opts.ctrl_socket) |
592 |
os.unlink(opts.ctrl_socket) |
593 |
daemon_context.close() |
594 |
sys.exit(0)
|