annotate sat/plugins/plugin_xep_0047.py @ 3913:944f51f9c2b4

core (xmpp): make `send` a blocking method, fix `sendMessageData` calls: original `send` method is blocking, and it is used as such by Wokkel and thus can't be changed to an async method easily. However, an Async method is necessary to have an async trigger at the very end of the send workflow for end-to-end encryption. To workaround that, `send` is an async method which call `a_send`, an async method which actually does the sending. This way legacy method can still call `send` while `a_send` can be await otherwise. Fix calls to `sendMessageData`: the method now being an `async` one, `ensureDeferred` had to be used in some calls.
author Goffi <goffi@goffi.org>
date Sat, 24 Sep 2022 16:31:39 +0200
parents be6d91572633
children 524856bd7b19
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1 #!/usr/bin/env python3
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2
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4 # SAT plugin for managing gateways (xep-0047)
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 from sat.core.i18n import _
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21 from sat.core.log import getLogger
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23 log = getLogger(__name__)
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24 from sat.core.constants import Const as C
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25 from sat.core import exceptions
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26 from twisted.words.protocols.jabber import jid
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27 from twisted.words.protocols.jabber import xmlstream
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28 from twisted.words.protocols.jabber import error
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29 from twisted.internet import reactor
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30 from twisted.internet import defer
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31 from twisted.python import failure
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33 from wokkel import disco, iwokkel
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34
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35 from zope.interface import implementer
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37 import base64
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39 try:
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40 from twisted.words.protocols.xmlstream import XMPPHandler
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41 except ImportError:
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42 from wokkel.subprotocols import XMPPHandler
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43
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44 MESSAGE = "/message"
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45 IQ_SET = '/iq[@type="set"]'
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46 NS_IBB = "http://jabber.org/protocol/ibb"
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47 IBB_OPEN = IQ_SET + '/open[@xmlns="' + NS_IBB + '"]'
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48 IBB_CLOSE = IQ_SET + '/close[@xmlns="' + NS_IBB + '" and @sid="{}"]'
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49 IBB_IQ_DATA = IQ_SET + '/data[@xmlns="' + NS_IBB + '" and @sid="{}"]'
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50 IBB_MESSAGE_DATA = MESSAGE + '/data[@xmlns="' + NS_IBB + '" and @sid="{}"]'
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51 TIMEOUT = 120 # timeout for workflow
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52 DEFER_KEY = "finished" # key of the deferred used to track session end
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54 PLUGIN_INFO = {
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55 C.PI_NAME: "In-Band Bytestream Plugin",
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56 C.PI_IMPORT_NAME: "XEP-0047",
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57 C.PI_TYPE: "XEP",
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58 C.PI_MODES: C.PLUG_MODE_BOTH,
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59 C.PI_PROTOCOLS: ["XEP-0047"],
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60 C.PI_MAIN: "XEP_0047",
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61 C.PI_HANDLER: "yes",
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62 C.PI_DESCRIPTION: _("""Implementation of In-Band Bytestreams"""),
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63 }
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65
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66 class XEP_0047(object):
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67 NAMESPACE = NS_IBB
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68 BLOCK_SIZE = 4096
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70 def __init__(self, host):
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71 log.info(_("In-Band Bytestreams plugin initialization"))
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72 self.host = host
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73
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74 def getHandler(self, client):
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75 return XEP_0047_handler(self)
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76
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77 def profileConnected(self, client):
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78 client.xep_0047_current_stream = {} # key: stream_id, value: data(dict)
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79
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80 def _timeOut(self, sid, client):
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81 """Delete current_stream id, called after timeout
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82
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83 @param sid(unicode): session id of client.xep_0047_current_stream
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84 @param client: %(doc_client)s
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85 """
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86 log.info(
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87 "In-Band Bytestream: TimeOut reached for id {sid} [{profile}]".format(
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88 sid=sid, profile=client.profile
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89 )
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90 )
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91 self._killSession(sid, client, "TIMEOUT")
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92
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93 def _killSession(self, sid, client, failure_reason=None):
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94 """Delete a current_stream id, clean up associated observers
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95
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96 @param sid(unicode): session id
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97 @param client: %(doc_client)s
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98 @param failure_reason(None, unicode): if None the session is successful
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99 else, will be used to call failure_cb
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100 """
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101 try:
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102 session = client.xep_0047_current_stream[sid]
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103 except KeyError:
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104 log.warning("kill id called on a non existant id")
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105 return
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106
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107 try:
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108 observer_cb = session["observer_cb"]
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109 except KeyError:
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110 pass
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111 else:
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112 client.xmlstream.removeObserver(session["event_data"], observer_cb)
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113
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114 if session["timer"].active():
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115 session["timer"].cancel()
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116
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117 del client.xep_0047_current_stream[sid]
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118
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119 success = failure_reason is None
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120 stream_d = session[DEFER_KEY]
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121
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122 if success:
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123 stream_d.callback(None)
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124 else:
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125 stream_d.errback(failure.Failure(exceptions.DataError(failure_reason)))
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126
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127 def createSession(self, *args, **kwargs):
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128 """like [_createSession] but return the session deferred instead of the whole session
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129
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130 session deferred is fired when transfer is finished
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131 """
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132 return self._createSession(*args, **kwargs)[DEFER_KEY]
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133
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134 def _createSession(self, client, stream_object, local_jid, to_jid, sid):
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135 """Called when a bytestream is imminent
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136
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137 @param stream_object(IConsumer): stream object where data will be written
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138 @param local_jid(jid.JID): same as [startStream]
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139 @param to_jid(jid.JId): jid of the other peer
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140 @param sid(unicode): session id
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141 @return (dict): session data
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142 """
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143 if sid in client.xep_0047_current_stream:
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144 raise exceptions.ConflictError("A session with this id already exists !")
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145 session_data = client.xep_0047_current_stream[sid] = {
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146 "id": sid,
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147 DEFER_KEY: defer.Deferred(),
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148 "local_jid": local_jid,
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149 "to": to_jid,
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150 "stream_object": stream_object,
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151 "seq": -1,
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152 "timer": reactor.callLater(TIMEOUT, self._timeOut, sid, client),
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153 }
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154
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155 return session_data
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156
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157 def _onIBBOpen(self, iq_elt, client):
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158 """"Called when an IBB <open> element is received
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159
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160 @param iq_elt(domish.Element): the whole <iq> stanza
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161 """
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162 log.debug(_("IBB stream opening"))
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163 iq_elt.handled = True
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164 open_elt = next(iq_elt.elements(NS_IBB, "open"))
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165 block_size = open_elt.getAttribute("block-size")
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166 sid = open_elt.getAttribute("sid")
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167 stanza = open_elt.getAttribute("stanza", "iq")
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168 if not sid or not block_size or int(block_size) > 65535:
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169 return self._sendError("not-acceptable", sid or None, iq_elt, client)
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170 if not sid in client.xep_0047_current_stream:
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171 log.warning(_("Ignoring unexpected IBB transfer: %s" % sid))
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172 return self._sendError("not-acceptable", sid or None, iq_elt, client)
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173 session_data = client.xep_0047_current_stream[sid]
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174 if session_data["to"] != jid.JID(iq_elt["from"]):
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175 log.warning(
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176 _("sended jid inconsistency (man in the middle attack attempt ?)")
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177 )
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178 return self._sendError("not-acceptable", sid, iq_elt, client)
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179
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180 # at this stage, the session looks ok and will be accepted
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181
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182 # we reset the timeout:
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183 session_data["timer"].reset(TIMEOUT)
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184
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185 # we save the xmlstream, events and observer data to allow observer removal
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186 session_data["event_data"] = event_data = (
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187 IBB_MESSAGE_DATA if stanza == "message" else IBB_IQ_DATA
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188 ).format(sid)
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189 session_data["observer_cb"] = observer_cb = self._onIBBData
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190 event_close = IBB_CLOSE.format(sid)
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191 # we now set the stream observer to look after data packet
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192 # FIXME: if we never get the events, the observers stay.
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193 # would be better to have generic observer and check id once triggered
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194 client.xmlstream.addObserver(event_data, observer_cb, client=client)
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195 client.xmlstream.addOnetimeObserver(event_close, self._onIBBClose, client=client)
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196 # finally, we send the accept stanza
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197 iq_result_elt = xmlstream.toResponse(iq_elt, "result")
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diff changeset
198 client.send(iq_result_elt)
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199
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200 def _onIBBClose(self, iq_elt, client):
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201 """"Called when an IBB <close> element is received
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202
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203 @param iq_elt(domish.Element): the whole <iq> stanza
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204 """
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205 iq_elt.handled = True
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206 log.debug(_("IBB stream closing"))
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207 close_elt = next(iq_elt.elements(NS_IBB, "close"))
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208 # XXX: this observer is only triggered on valid sid, so we don't need to check it
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209 sid = close_elt["sid"]
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210
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211 iq_result_elt = xmlstream.toResponse(iq_elt, "result")
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diff changeset
212 client.send(iq_result_elt)
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213 self._killSession(sid, client)
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214
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215 def _onIBBData(self, element, client):
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216 """Observer called on <iq> or <message> stanzas with data element
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217
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218 Manage the data elelement (check validity and write to the stream_object)
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219 @param element(domish.Element): <iq> or <message> stanza
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220 """
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221 element.handled = True
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222 data_elt = next(element.elements(NS_IBB, "data"))
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223 sid = data_elt["sid"]
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224
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225 try:
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226 session_data = client.xep_0047_current_stream[sid]
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227 except KeyError:
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228 log.warning(_("Received data for an unknown session id"))
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229 return self._sendError("item-not-found", None, element, client)
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230
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231 from_jid = session_data["to"]
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232 stream_object = session_data["stream_object"]
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233
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234 if from_jid.full() != element["from"]:
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235 log.warning(
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236 _(
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237 "sended jid inconsistency (man in the middle attack attempt ?)\ninitial={initial}\ngiven={given}"
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238 ).format(initial=from_jid, given=element["from"])
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239 )
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240 if element.name == "iq":
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241 self._sendError("not-acceptable", sid, element, client)
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242 return
384
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parents:
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243
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244 session_data["seq"] = (session_data["seq"] + 1) % 65535
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245 if int(data_elt.getAttribute("seq", -1)) != session_data["seq"]:
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246 log.warning(_("Sequence error"))
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247 if element.name == "iq":
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Goffi <goffi@goffi.org>
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248 reason = "not-acceptable"
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diff changeset
249 self._sendError(reason, sid, element, client)
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250 self.terminateStream(session_data, client, reason)
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Goffi <goffi@goffi.org>
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diff changeset
251 return
384
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parents:
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252
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253 # we reset the timeout:
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254 session_data["timer"].reset(TIMEOUT)
384
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parents:
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255
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256 # we can now decode the data
384
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Goffi <goffi@goffi.org>
parents:
diff changeset
257 try:
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Goffi <goffi@goffi.org>
parents: 2483
diff changeset
258 stream_object.write(base64.b64decode(str(data_elt)))
384
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parents:
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259 except TypeError:
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260 # The base64 data is invalid
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261 log.warning(_("Invalid base64 data"))
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Goffi <goffi@goffi.org>
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diff changeset
262 if element.name == "iq":
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263 self._sendError("not-acceptable", sid, element, client)
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parents: 1409
diff changeset
264 self.terminateStream(session_data, client, reason)
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Goffi <goffi@goffi.org>
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diff changeset
265 return
384
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266
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267 # we can now ack success
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268 if element.name == "iq":
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Goffi <goffi@goffi.org>
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diff changeset
269 iq_result_elt = xmlstream.toResponse(element, "result")
2129
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Goffi <goffi@goffi.org>
parents: 1934
diff changeset
270 client.send(iq_result_elt)
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271
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272 def _sendError(self, error_condition, sid, iq_elt, client):
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273 """Send error stanza
384
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274
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275 @param error_condition: one of twisted.words.protocols.jabber.error.STANZA_CONDITIONS keys
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276 @param sid(unicode,None): jingle session id, or None, if session must not be destroyed
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277 @param iq_elt(domish.Element): full <iq> stanza
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278 @param client: %(doc_client)s
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279 """
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280 iq_elt = error.StanzaError(error_condition).toResponse(iq_elt)
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281 log.warning(
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282 "Error while managing in-band bytestream session, cancelling: {}".format(
2624
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diff changeset
283 error_condition
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diff changeset
284 )
56f94936df1e code style reformatting using black
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diff changeset
285 )
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diff changeset
286 if sid is not None:
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diff changeset
287 self._killSession(sid, client, error_condition)
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Goffi <goffi@goffi.org>
parents: 1934
diff changeset
288 client.send(iq_elt)
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289
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diff changeset
290 def startStream(self, client, stream_object, local_jid, to_jid, sid, block_size=None):
384
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291 """Launch the stream workflow
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292
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293 @param stream_object(ifaces.IStreamProducer): stream object to send
2927
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Goffi <goffi@goffi.org>
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294 @param local_jid(jid.JID): jid to use as local jid
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diff changeset
295 This is needed for client which can be addressed with a different jid than
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diff changeset
296 client.jid if a local part is used (e.g. piotr@file.example.net where
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diff changeset
297 client.jid would be file.example.net)
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298 @param to_jid(jid.JID): JID of the recipient
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299 @param sid(unicode): Stream session id
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diff changeset
300 @param block_size(int, None): size of the block (or None for default)
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diff changeset
301 """
2927
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diff changeset
302 session_data = self._createSession(client, stream_object, local_jid, to_jid, sid)
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diff changeset
303
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Goffi <goffi@goffi.org>
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diff changeset
304 if block_size is None:
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parents: 1409
diff changeset
305 block_size = XEP_0047.BLOCK_SIZE
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diff changeset
306 assert block_size <= 65535
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diff changeset
307 session_data["block_size"] = block_size
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diff changeset
308
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Goffi <goffi@goffi.org>
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diff changeset
309 iq_elt = client.IQ()
2927
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Goffi <goffi@goffi.org>
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diff changeset
310 iq_elt["from"] = local_jid.full()
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diff changeset
311 iq_elt["to"] = to_jid.full()
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diff changeset
312 open_elt = iq_elt.addElement((NS_IBB, "open"))
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Goffi <goffi@goffi.org>
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diff changeset
313 open_elt["block-size"] = str(block_size)
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Goffi <goffi@goffi.org>
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diff changeset
314 open_elt["sid"] = sid
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Goffi <goffi@goffi.org>
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diff changeset
315 open_elt["stanza"] = "iq" # TODO: manage <message> stanza ?
1578
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diff changeset
316 args = [session_data, client]
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diff changeset
317 d = iq_elt.send()
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diff changeset
318 d.addCallbacks(self._IQDataStreamCb, self._IQDataStreamEb, args, None, args)
1558
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Goffi <goffi@goffi.org>
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diff changeset
319 return session_data[DEFER_KEY]
384
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parents:
diff changeset
320
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diff changeset
321 def _IQDataStreamCb(self, iq_elt, session_data, client):
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diff changeset
322 """Called during the whole data streaming
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diff changeset
323
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diff changeset
324 @param iq_elt(domish.Element): iq result
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325 @param session_data(dict): data of this streaming session
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326 @param client: %(doc_client)s
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diff changeset
327 """
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Goffi <goffi@goffi.org>
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diff changeset
328 session_data["timer"].reset(TIMEOUT)
587
952322b1d490 Remove trailing whitespaces.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 585
diff changeset
329
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Goffi <goffi@goffi.org>
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diff changeset
330 # FIXME: producer/consumer mechanism is not used properly here
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diff changeset
331 buffer_ = session_data["stream_object"].file_obj.read(session_data["block_size"])
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diff changeset
332 if buffer_:
1578
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Goffi <goffi@goffi.org>
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diff changeset
333 next_iq_elt = client.IQ()
2927
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diff changeset
334 next_iq_elt["from"] = session_data["local_jid"].full()
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diff changeset
335 next_iq_elt["to"] = session_data["to"].full()
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Goffi <goffi@goffi.org>
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diff changeset
336 data_elt = next_iq_elt.addElement((NS_IBB, "data"))
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diff changeset
337 seq = session_data["seq"] = (session_data["seq"] + 1) % 65535
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diff changeset
338 data_elt["seq"] = str(seq)
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diff changeset
339 data_elt["sid"] = session_data["id"]
3392
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Goffi <goffi@goffi.org>
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diff changeset
340 data_elt.addContent(base64.b64encode(buffer_).decode())
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Goffi <goffi@goffi.org>
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diff changeset
341 args = [session_data, client]
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Goffi <goffi@goffi.org>
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diff changeset
342 d = next_iq_elt.send()
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Goffi <goffi@goffi.org>
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diff changeset
343 d.addCallbacks(self._IQDataStreamCb, self._IQDataStreamEb, args, None, args)
384
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diff changeset
344 else:
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diff changeset
345 self.terminateStream(session_data, client)
384
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diff changeset
346
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diff changeset
347 def _IQDataStreamEb(self, failure, session_data, client):
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diff changeset
348 if failure.check(error.StanzaError):
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diff changeset
349 log.warning("IBB transfer failed: {}".format(failure.value))
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diff changeset
350 else:
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diff changeset
351 log.error("IBB transfer failed: {}".format(failure.value))
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diff changeset
352 self.terminateStream(session_data, client, "IQ_ERROR")
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diff changeset
353
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diff changeset
354 def terminateStream(self, session_data, client, failure_reason=None):
384
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diff changeset
355 """Terminate the stream session
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diff changeset
356
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diff changeset
357 @param session_data(dict): data of this streaming session
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diff changeset
358 @param client: %(doc_client)s
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diff changeset
359 @param failure_reason(unicode, None): reason of the failure, or None if steam was successful
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diff changeset
360 """
1578
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Goffi <goffi@goffi.org>
parents: 1558
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361 iq_elt = client.IQ()
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Goffi <goffi@goffi.org>
parents: 2771
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362 iq_elt["from"] = session_data["local_jid"].full()
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363 iq_elt["to"] = session_data["to"].full()
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364 close_elt = iq_elt.addElement((NS_IBB, "close"))
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365 close_elt["sid"] = session_data["id"]
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366 iq_elt.send()
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367 self._killSession(session_data["id"], client, failure_reason)
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368
594
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
369
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Goffi <goffi@goffi.org>
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370 @implementer(iwokkel.IDisco)
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371 class XEP_0047_handler(XMPPHandler):
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 585
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372
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parents: 588
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373 def __init__(self, parent):
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374 self.plugin_parent = parent
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 585
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375
384
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376 def connectionInitialized(self):
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377 self.xmlstream.addObserver(
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378 IBB_OPEN, self.plugin_parent._onIBBOpen, client=self.parent
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parents: 2562
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379 )
384
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parents:
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380
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381 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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382 return [disco.DiscoFeature(NS_IBB)]
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Goffi <goffi@goffi.org>
parents:
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383
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parents: 2562
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384 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
384
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Goffi <goffi@goffi.org>
parents:
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385 return []