292 lines
10 KiB
Python
292 lines
10 KiB
Python
import logging
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import threading
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import socket
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from hashlib import sha1
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from uuid import uuid4
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from sleekxmpp.thirdparty.socks import socksocket, PROXY_TYPE_SOCKS5
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from sleekxmpp.stanza import Iq
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from sleekxmpp.exceptions import XMPPError
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from sleekxmpp.xmlstream import register_stanza_plugin
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from sleekxmpp.xmlstream.handler import Callback
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from sleekxmpp.xmlstream.matcher import StanzaPath
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from sleekxmpp.plugins.base import base_plugin
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from sleekxmpp.plugins.xep_0065 import stanza, Socks5
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log = logging.getLogger(__name__)
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class XEP_0065(base_plugin):
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name = 'xep_0065'
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description = "Socks5 Bytestreams"
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dependencies = set(['xep_0030'])
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default_config = {
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'auto_accept': False
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}
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def plugin_init(self):
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register_stanza_plugin(Iq, Socks5)
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self._proxies = {}
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self._sessions = {}
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self._sessions_lock = threading.Lock()
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self._preauthed_sids_lock = threading.Lock()
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self._preauthed_sids = {}
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self.xmpp.register_handler(
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Callback('Socks5 Bytestreams',
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StanzaPath('iq@type=set/socks/streamhost'),
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self._handle_streamhost))
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self.api.register(self._authorized, 'authorized', default=True)
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self.api.register(self._authorized_sid, 'authorized_sid', default=True)
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self.api.register(self._preauthorize_sid, 'preauthorize_sid', default=True)
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def session_bind(self, jid):
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self.xmpp['xep_0030'].add_feature(Socks5.namespace)
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def plugin_end(self):
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self.xmpp.remove_handler('Socks5 Bytestreams')
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self.xmpp.remove_handler('Socks5 Streamhost Used')
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self.xmpp['xep_0030'].del_feature(feature=Socks5.namespace)
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def get_socket(self, sid):
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"""Returns the socket associated to the SID."""
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return self._sessions.get(sid, None)
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def handshake(self, to, ifrom=None, sid=None, timeout=None):
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""" Starts the handshake to establish the socks5 bytestreams
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connection.
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"""
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if not self._proxies:
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self._proxies = self.discover_proxies()
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if sid is None:
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sid = uuid4().hex
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used = self.request_stream(to, sid=sid, ifrom=ifrom, timeout=timeout)
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proxy = used['socks']['streamhost_used']['jid']
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if proxy not in self._proxies:
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log.warning('Received unknown SOCKS5 proxy: %s', proxy)
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return
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with self._sessions_lock:
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self._sessions[sid] = self._connect_proxy(
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sid,
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self.xmpp.boundjid,
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to,
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self._proxies[proxy][0],
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self._proxies[proxy][1],
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peer=to)
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# Request that the proxy activate the session with the target.
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self.activate(proxy, sid, to, timeout=timeout)
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socket = self.get_socket(sid)
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self.xmpp.event('stream:%s:%s' % (sid, to), socket)
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return socket
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def request_stream(self, to, sid=None, ifrom=None, block=True, timeout=None, callback=None):
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if sid is None:
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sid = uuid4().hex
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# Requester initiates S5B negotiation with Target by sending
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# IQ-set that includes the JabberID and network address of
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# StreamHost as well as the StreamID (SID) of the proposed
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# bytestream.
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iq = self.xmpp.Iq()
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iq['to'] = to
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iq['from'] = ifrom
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iq['type'] = 'set'
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iq['socks']['sid'] = sid
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for proxy, (host, port) in self._proxies.items():
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iq['socks'].add_streamhost(proxy, host, port)
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return iq.send(block=block, timeout=timeout, callback=callback)
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def discover_proxies(self, jid=None, ifrom=None, timeout=None):
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"""Auto-discover the JIDs of SOCKS5 proxies on an XMPP server."""
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if jid is None:
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if self.xmpp.is_component:
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jid = self.xmpp.server
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else:
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jid = self.xmpp.boundjid.server
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discovered = set()
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disco_items = self.xmpp['xep_0030'].get_items(jid, timeout=timeout)
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for item in disco_items['disco_items']['items']:
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try:
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disco_info = self.xmpp['xep_0030'].get_info(item[0], timeout=timeout)
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except XMPPError:
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continue
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else:
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# Verify that the identity is a bytestream proxy.
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identities = disco_info['disco_info']['identities']
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for identity in identities:
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if identity[0] == 'proxy' and identity[1] == 'bytestreams':
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discovered.add(disco_info['from'])
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for jid in discovered:
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try:
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addr = self.get_network_address(jid, ifrom=ifrom, timeout=timeout)
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self._proxies[jid] = (addr['socks']['streamhost']['host'],
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addr['socks']['streamhost']['port'])
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except XMPPError:
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continue
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return self._proxies
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def get_network_address(self, proxy, ifrom=None, block=True, timeout=None, callback=None):
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"""Get the network information of a proxy."""
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iq = self.xmpp.Iq(sto=proxy, stype='get', sfrom=ifrom)
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iq.enable('socks')
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return iq.send(block=block, timeout=timeout, callback=callback)
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def _handle_streamhost(self, iq):
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"""Handle incoming SOCKS5 session request."""
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sid = iq['socks']['sid']
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if not sid:
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raise XMPPError(etype='modify', condition='bad-request')
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if not self._accept_stream(iq):
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raise XMPPError(etype='modify', condition='not-acceptable')
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streamhosts = iq['socks']['streamhosts']
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conn = None
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used_streamhost = None
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sender = iq['from']
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for streamhost in streamhosts:
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try:
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conn = self._connect_proxy(sid,
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sender,
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self.xmpp.boundjid,
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streamhost['host'],
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streamhost['port'],
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peer=sender)
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used_streamhost = streamhost['jid']
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break
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except socket.error:
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continue
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else:
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raise XMPPError(etype='cancel', condition='item-not-found')
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iq.reply()
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with self._sessions_lock:
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self._sessions[sid] = conn
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iq['socks']['sid'] = sid
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iq['socks']['streamhost_used']['jid'] = used_streamhost
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iq.send()
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self.xmpp.event('socks5_stream', conn)
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self.xmpp.event('stream:%s:%s' % (sid, conn.peer_jid), conn)
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def activate(self, proxy, sid, target, ifrom=None, block=True, timeout=None, callback=None):
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"""Activate the socks5 session that has been negotiated."""
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iq = self.xmpp.Iq(sto=proxy, stype='set', sfrom=ifrom)
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iq['socks']['sid'] = sid
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iq['socks']['activate'] = target
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iq.send(block=block, timeout=timeout, callback=callback)
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def deactivate(self, sid):
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"""Closes the proxy socket associated with this SID."""
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sock = self._sessions.get(sid)
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if sock:
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try:
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# sock.close() will also delete sid from self._sessions (see _connect_proxy)
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sock.close()
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except socket.error:
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pass
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# Though this should not be neccessary remove the closed session anyway
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with self._sessions_lock:
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if sid in self._sessions:
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log.warn(('SOCKS5 session with sid = "%s" was not ' +
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'removed from _sessions by sock.close()') % sid)
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del self._sessions[sid]
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def close(self):
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"""Closes all proxy sockets."""
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for sid, sock in self._sessions.items():
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sock.close()
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with self._sessions_lock:
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self._sessions = {}
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def _connect_proxy(self, sid, requester, target, proxy, proxy_port, peer=None):
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""" Establishes a connection between the client and the server-side
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Socks5 proxy.
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sid : The StreamID. <str>
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requester : The JID of the requester. <str>
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target : The JID of the target. <str>
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proxy_host : The hostname or the IP of the proxy. <str>
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proxy_port : The port of the proxy. <str> or <int>
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peer : The JID for the other side of the stream, regardless
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of target or requester status.
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"""
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# Because the xep_0065 plugin uses the proxy_port as string,
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# the Proxy class accepts the proxy_port argument as a string
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# or an integer. Here, we force to use the port as an integer.
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proxy_port = int(proxy_port)
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sock = socksocket()
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sock.setproxy(PROXY_TYPE_SOCKS5, proxy, port=proxy_port)
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# The hostname MUST be SHA1(SID + Requester JID + Target JID)
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# where the output is hexadecimal-encoded (not binary).
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digest = sha1()
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digest.update(sid)
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digest.update(str(requester))
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digest.update(str(target))
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dest = digest.hexdigest()
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# The port MUST be 0.
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sock.connect((dest, 0))
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log.info('Socket connected.')
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_close = sock.close
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def close(*args, **kwargs):
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with self._sessions_lock:
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if sid in self._sessions:
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del self._sessions[sid]
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_close()
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log.info('Socket closed.')
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sock.close = close
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sock.peer_jid = peer
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sock.self_jid = target if requester == peer else requester
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self.xmpp.event('socks_connected', sid)
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return sock
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def _accept_stream(self, iq):
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receiver = iq['to']
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sender = iq['from']
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sid = iq['socks']['sid']
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if self.api['authorized_sid'](receiver, sid, sender, iq):
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return True
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return self.api['authorized'](receiver, sid, sender, iq)
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def _authorized(self, jid, sid, ifrom, iq):
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return self.auto_accept
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def _authorized_sid(self, jid, sid, ifrom, iq):
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with self._preauthed_sids_lock:
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log.debug('>>> authed sids: %s', self._preauthed_sids)
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log.debug('>>> lookup: %s %s %s', jid, sid, ifrom)
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if (jid, sid, ifrom) in self._preauthed_sids:
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del self._preauthed_sids[(jid, sid, ifrom)]
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return True
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return False
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def _preauthorize_sid(self, jid, sid, ifrom, data):
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log.debug('>>>> %s %s %s %s', jid, sid, ifrom, data)
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with self._preauthed_sids_lock:
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self._preauthed_sids[(jid, sid, ifrom)] = True
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