annotate sat/plugins/plugin_xep_0047.py @ 3153:2c7b42f53e9a

core (xmpp): avoid starting several clients at the same time: a check is done to avoid running startConnection several times at once, which would lead to the creation of several SatXMPPEntity instances at the same time, resulting in many issues. If startConnection is called while a previous one is not finished yet, a CancelError is now raised.
author Goffi <goffi@goffi.org>
date Mon, 03 Feb 2020 13:46:24 +0100
parents 559a625a236b
children 0957ea9137b8
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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) 2009-2020 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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16
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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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19
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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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22
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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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53
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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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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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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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243
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diff changeset
244 session_data["seq"] = (session_data["seq"] + 1) % 65535
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parents: 1409
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245 if int(data_elt.getAttribute("seq", -1)) != session_data["seq"]:
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diff changeset
246 log.warning(_("Sequence error"))
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diff changeset
247 if element.name == "iq":
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diff changeset
248 reason = "not-acceptable"
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diff changeset
249 self._sendError(reason, sid, element, client)
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diff changeset
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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252
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253 # we reset the timeout:
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diff changeset
254 session_data["timer"].reset(TIMEOUT)
384
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parents:
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255
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diff changeset
256 # we can now decode the data
384
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parents:
diff changeset
257 try:
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e2a7bb875957 plugin pipe/stream, file transfert: refactoring and improvments:
Goffi <goffi@goffi.org>
parents: 2483
diff changeset
258 stream_object.write(base64.b64decode(str(data_elt)))
384
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parents:
diff changeset
259 except TypeError:
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diff changeset
260 # The base64 data is invalid
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diff changeset
261 log.warning(_("Invalid base64 data"))
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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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Goffi <goffi@goffi.org>
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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diff changeset
267 # we can now ack success
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diff changeset
268 if element.name == "iq":
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diff changeset
269 iq_result_elt = xmlstream.toResponse(element, "result")
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Goffi <goffi@goffi.org>
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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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diff changeset
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(
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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>
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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
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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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297 client.jid would be file.example.net)
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diff changeset
298 @param to_jid(jid.JID): JID of the recipient
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diff changeset
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 """
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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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diff changeset
304 if block_size is None:
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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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diff changeset
309 iq_elt = client.IQ()
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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 ?
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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)
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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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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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diff changeset
326 @param client: %(doc_client)s
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327 """
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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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diff changeset
330 buffer_ = session_data["stream_object"].read(session_data["block_size"])
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diff changeset
331 if buffer_:
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Goffi <goffi@goffi.org>
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diff changeset
332 next_iq_elt = client.IQ()
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Goffi <goffi@goffi.org>
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diff changeset
333 next_iq_elt["from"] = session_data["local_jid"].full()
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diff changeset
334 next_iq_elt["to"] = session_data["to"].full()
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diff changeset
335 data_elt = next_iq_elt.addElement((NS_IBB, "data"))
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diff changeset
336 seq = session_data["seq"] = (session_data["seq"] + 1) % 65535
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diff changeset
337 data_elt["seq"] = str(seq)
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diff changeset
338 data_elt["sid"] = session_data["id"]
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diff changeset
339 data_elt.addContent(base64.b64encode(buffer_))
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diff changeset
340 args = [session_data, client]
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diff changeset
341 d = next_iq_elt.send()
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diff changeset
342 d.addCallbacks(self._IQDataStreamCb, self._IQDataStreamEb, args, None, args)
384
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diff changeset
343 else:
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diff changeset
344 self.terminateStream(session_data, client)
384
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diff changeset
345
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diff changeset
346 def _IQDataStreamEb(self, failure, session_data, client):
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diff changeset
347 if failure.check(error.StanzaError):
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diff changeset
348 log.warning("IBB transfer failed: {}".format(failure.value))
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diff changeset
349 else:
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diff changeset
350 log.error("IBB transfer failed: {}".format(failure.value))
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diff changeset
351 self.terminateStream(session_data, client, "IQ_ERROR")
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diff changeset
352
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diff changeset
353 def terminateStream(self, session_data, client, failure_reason=None):
384
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diff changeset
354 """Terminate the stream session
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diff changeset
355
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diff changeset
356 @param session_data(dict): data of this streaming session
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diff changeset
357 @param client: %(doc_client)s
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diff changeset
358 @param failure_reason(unicode, None): reason of the failure, or None if steam was successful
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diff changeset
359 """
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diff changeset
360 iq_elt = client.IQ()
2927
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Goffi <goffi@goffi.org>
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diff changeset
361 iq_elt["from"] = session_data["local_jid"].full()
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362 iq_elt["to"] = session_data["to"].full()
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363 close_elt = iq_elt.addElement((NS_IBB, "close"))
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364 close_elt["sid"] = session_data["id"]
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365 iq_elt.send()
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366 self._killSession(session_data["id"], client, failure_reason)
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367
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368
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369 @implementer(iwokkel.IDisco)
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370 class XEP_0047_handler(XMPPHandler):
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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371
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372 def __init__(self, parent):
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373 self.plugin_parent = parent
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parents: 585
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374
384
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375 def connectionInitialized(self):
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376 self.xmlstream.addObserver(
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377 IBB_OPEN, self.plugin_parent._onIBBOpen, client=self.parent
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parents: 2562
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378 )
384
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379
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380 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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381 return [disco.DiscoFeature(NS_IBB)]
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382
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383 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
384
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Goffi <goffi@goffi.org>
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384 return []