Mercurial > libervia-backend
annotate sat/plugins/plugin_xep_0260.py @ 3836:e183f1fbfa8d
doc (cli/pubsub): add doc for ``reference`` subcommand:
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author | Goffi <goffi@goffi.org> |
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date | Sun, 10 Jul 2022 16:15:09 +0200 (2022-07-10) |
parents | be6d91572633 |
children | 524856bd7b19 |
rev | line source |
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3028 | 1 #!/usr/bin/env python3 |
3137 | 2 |
1560 | 3 |
4 # SAT plugin for Jingle (XEP-0260) | |
3479 | 5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) |
1560 | 6 |
7 # This program is free software: you can redistribute it and/or modify | |
8 # it under the terms of the GNU Affero General Public License as published by | |
9 # the Free Software Foundation, either version 3 of the License, or | |
10 # (at your option) any later version. | |
11 | |
12 # This program is distributed in the hope that it will be useful, | |
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 # GNU Affero General Public License for more details. | |
16 | |
17 # You should have received a copy of the GNU Affero General Public License | |
18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | |
20 from sat.core.i18n import _ | |
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21 from sat.core.constants import Const as C |
1560 | 22 from sat.core.log import getLogger |
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23 |
1560 | 24 log = getLogger(__name__) |
25 from sat.core import exceptions | |
26 from wokkel import disco, iwokkel | |
3028 | 27 from zope.interface import implementer |
1560 | 28 from twisted.words.xish import domish |
29 from twisted.words.protocols.jabber import jid | |
30 from twisted.internet import defer | |
31 import uuid | |
32 | |
33 try: | |
34 from twisted.words.protocols.xmlstream import XMPPHandler | |
35 except ImportError: | |
36 from wokkel.subprotocols import XMPPHandler | |
37 | |
38 | |
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39 NS_JINGLE_S5B = "urn:xmpp:jingle:transports:s5b:1" |
1560 | 40 |
41 PLUGIN_INFO = { | |
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42 C.PI_NAME: "Jingle SOCKS5 Bytestreams", |
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43 C.PI_IMPORT_NAME: "XEP-0260", |
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44 C.PI_TYPE: "XEP", |
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45 C.PI_MODES: C.PLUG_MODE_BOTH, |
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46 C.PI_PROTOCOLS: ["XEP-0260"], |
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47 C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0065"], |
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48 C.PI_RECOMMENDATIONS: ["XEP-0261"], # needed for fallback |
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49 C.PI_MAIN: "XEP_0260", |
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50 C.PI_HANDLER: "yes", |
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51 C.PI_DESCRIPTION: _("""Implementation of Jingle SOCKS5 Bytestreams"""), |
1560 | 52 } |
53 | |
54 | |
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55 class ProxyError(Exception): |
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56 def __str__(self): |
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57 return "an error happened while trying to use the proxy" |
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58 |
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59 |
1560 | 60 class XEP_0260(object): |
61 # TODO: udp handling | |
62 | |
63 def __init__(self, host): | |
64 log.info(_("plugin Jingle SOCKS5 Bytestreams")) | |
65 self.host = host | |
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66 self._j = host.plugins["XEP-0166"] # shortcut to access jingle |
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67 self._s5b = host.plugins["XEP-0065"] # and socks5 bytestream |
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68 try: |
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69 self._jingle_ibb = host.plugins["XEP-0261"] |
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70 except KeyError: |
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71 self._jingle_ibb = None |
1560 | 72 self._j.registerTransport(NS_JINGLE_S5B, self._j.TRANSPORT_STREAMING, self, 100) |
73 | |
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74 def getHandler(self, client): |
1560 | 75 return XEP_0260_handler() |
76 | |
77 def _parseCandidates(self, transport_elt): | |
78 """Parse <candidate> elements | |
79 | |
80 @param transport_elt(domish.Element): parent <transport> element | |
81 @return (list[plugin_xep_0065.Candidate): list of parsed candidates | |
82 """ | |
83 candidates = [] | |
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84 for candidate_elt in transport_elt.elements(NS_JINGLE_S5B, "candidate"): |
1560 | 85 try: |
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86 cid = candidate_elt["cid"] |
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87 host = candidate_elt["host"] |
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88 jid_ = jid.JID(candidate_elt["jid"]) |
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89 port = int(candidate_elt.getAttribute("port", 1080)) |
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90 priority = int(candidate_elt["priority"]) |
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91 type_ = candidate_elt.getAttribute("type", self._s5b.TYPE_DIRECT) |
1560 | 92 except (KeyError, ValueError): |
93 raise exceptions.DataError() | |
94 candidate = self._s5b.Candidate(host, port, type_, priority, jid_, cid) | |
95 candidates.append(candidate) | |
96 # self._s5b.registerCandidate(candidate) | |
97 return candidates | |
98 | |
99 def _buildCandidates(self, session, candidates, sid, session_hash, client, mode=None): | |
100 """Build <transport> element with candidates | |
101 | |
102 @param session(dict): jingle session data | |
103 @param candidates(iterator[plugin_xep_0065.Candidate]): iterator of candidates to add | |
104 @param sid(unicode): transport stream id | |
105 @param client: %(doc_client)s | |
106 @param mode(str, None): 'tcp' or 'udp', or None to have no attribute | |
107 @return (domish.Element): parent <transport> element where <candidate> elements must be added | |
108 """ | |
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109 proxy = next( |
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110 ( |
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111 candidate |
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112 for candidate in candidates |
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113 if candidate.type == self._s5b.TYPE_PROXY |
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114 ), |
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115 None, |
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116 ) |
1560 | 117 transport_elt = domish.Element((NS_JINGLE_S5B, "transport")) |
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118 transport_elt["sid"] = sid |
1560 | 119 if proxy is not None: |
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120 transport_elt["dstaddr"] = session_hash |
1560 | 121 if mode is not None: |
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122 transport_elt["mode"] = "tcp" # XXX: we only manage tcp for now |
1560 | 123 |
124 for candidate in candidates: | |
3028 | 125 log.debug("Adding candidate: {}".format(candidate)) |
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126 candidate_elt = transport_elt.addElement("candidate", NS_JINGLE_S5B) |
1560 | 127 if candidate.id is None: |
3028 | 128 candidate.id = str(uuid.uuid4()) |
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129 candidate_elt["cid"] = candidate.id |
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130 candidate_elt["host"] = candidate.host |
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131 candidate_elt["jid"] = candidate.jid.full() |
3028 | 132 candidate_elt["port"] = str(candidate.port) |
133 candidate_elt["priority"] = str(candidate.priority) | |
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134 candidate_elt["type"] = candidate.type |
1560 | 135 return transport_elt |
136 | |
137 @defer.inlineCallbacks | |
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138 def jingleSessionInit(self, client, session, content_name): |
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139 content_data = session["contents"][content_name] |
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140 transport_data = content_data["transport_data"] |
3028 | 141 sid = transport_data["sid"] = str(uuid.uuid4()) |
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142 session_hash = transport_data["session_hash"] = self._s5b.getSessionHash( |
3028 | 143 session["local_jid"], session["peer_jid"], sid |
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144 ) |
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145 transport_data["peer_session_hash"] = self._s5b.getSessionHash( |
3028 | 146 session["peer_jid"], session["local_jid"], sid |
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147 ) # requester and target are inversed for peer candidates |
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148 transport_data["stream_d"] = self._s5b.registerHash(client, session_hash, None) |
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149 candidates = transport_data["candidates"] = yield self._s5b.getCandidates( |
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150 client, session["local_jid"]) |
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151 mode = "tcp" # XXX: we only manage tcp for now |
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152 transport_elt = self._buildCandidates( |
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153 session, candidates, sid, session_hash, client, mode |
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154 ) |
1560 | 155 |
156 defer.returnValue(transport_elt) | |
157 | |
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158 def _proxyActivatedCb(self, iq_result_elt, client, candidate, session, content_name): |
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159 """Called when activation confirmation has been received from proxy |
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160 |
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161 cf XEP-0260 § 2.4 |
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162 """ |
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163 # now that the proxy is activated, we have to inform other peer |
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164 iq_elt, transport_elt = self._j.buildAction( |
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165 client, self._j.A_TRANSPORT_INFO, session, content_name |
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166 ) |
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167 activated_elt = transport_elt.addElement("activated") |
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168 activated_elt["cid"] = candidate.id |
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169 iq_elt.send() |
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170 |
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171 def _proxyActivatedEb(self, stanza_error, client, candidate, session, content_name): |
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172 """Called when activation error has been received from proxy |
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173 |
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174 cf XEP-0260 § 2.4 |
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175 """ |
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176 # TODO: fallback to IBB |
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177 # now that the proxy is activated, we have to inform other peer |
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178 iq_elt, transport_elt = self._j.buildAction( |
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179 client, self._j.A_TRANSPORT_INFO, session, content_name |
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180 ) |
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181 transport_elt.addElement("proxy-error") |
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182 iq_elt.send() |
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183 log.warning( |
3028 | 184 "Can't activate proxy, we need to fallback to IBB: {reason}".format( |
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185 reason=stanza_error.value.condition |
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186 ) |
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187 ) |
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188 self.doFallback(session, content_name, client) |
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189 |
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190 def _foundPeerCandidate( |
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191 self, candidate, session, transport_data, content_name, client |
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192 ): |
1560 | 193 """Called when the best candidate from other peer is found |
194 | |
195 @param candidate(XEP_0065.Candidate, None): selected candidate, | |
196 or None if no candidate is accessible | |
197 @param session(dict): session data | |
198 @param transport_data(dict): transport data | |
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199 @param content_name(unicode): name of the current content |
1560 | 200 @param client(unicode): %(doc_client)s |
201 """ | |
202 | |
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203 transport_data["best_candidate"] = candidate |
1560 | 204 # we need to disconnect all non selected candidates before removing them |
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205 for c in transport_data["peer_candidates"]: |
1560 | 206 if c is None or c is candidate: |
207 continue | |
208 c.discard() | |
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209 del transport_data["peer_candidates"] |
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210 iq_elt, transport_elt = self._j.buildAction( |
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211 client, self._j.A_TRANSPORT_INFO, session, content_name |
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212 ) |
1560 | 213 if candidate is None: |
3028 | 214 log.warning("Can't connect to any peer candidate") |
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215 candidate_elt = transport_elt.addElement("candidate-error") |
1560 | 216 else: |
3028 | 217 log.info("Found best peer candidate: {}".format(str(candidate))) |
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218 candidate_elt = transport_elt.addElement("candidate-used") |
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219 candidate_elt["cid"] = candidate.id |
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220 iq_elt.send() # TODO: check result stanza |
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221 self._checkCandidates(session, content_name, transport_data, client) |
1560 | 222 |
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223 def _checkCandidates(self, session, content_name, transport_data, client): |
1560 | 224 """Called when a candidate has been choosed |
225 | |
226 if we have both candidates, we select one, or fallback to an other transport | |
227 @param session(dict): session data | |
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228 @param content_name(unicode): name of the current content |
1560 | 229 @param transport_data(dict): transport data |
230 @param client(unicode): %(doc_client)s | |
231 """ | |
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232 content_data = session["contents"][content_name] |
1560 | 233 try: |
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234 best_candidate = transport_data["best_candidate"] |
1560 | 235 except KeyError: |
236 # we have not our best candidate yet | |
237 return | |
238 try: | |
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239 peer_best_candidate = transport_data["peer_best_candidate"] |
1560 | 240 except KeyError: |
241 # we have not peer best candidate yet | |
242 return | |
243 | |
244 # at this point we have both candidates, it's time to choose one | |
245 if best_candidate is None or peer_best_candidate is None: | |
246 choosed_candidate = best_candidate or peer_best_candidate | |
247 else: | |
248 if best_candidate.priority == peer_best_candidate.priority: | |
249 # same priority, we choose initiator one according to XEP-0260 §2.4 #4 | |
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250 log.debug( |
3028 | 251 "Candidates have same priority, we select the one choosed by initiator" |
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252 ) |
3028 | 253 if session["initiator"] == session["local_jid"]: |
1560 | 254 choosed_candidate = best_candidate |
255 else: | |
256 choosed_candidate = peer_best_candidate | |
257 else: | |
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258 choosed_candidate = max( |
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259 best_candidate, peer_best_candidate, key=lambda c: c.priority |
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260 ) |
1560 | 261 |
262 if choosed_candidate is None: | |
3028 | 263 log.warning("Socks5 negociation failed, we need to fallback to IBB") |
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264 self.doFallback(session, content_name, client) |
1560 | 265 else: |
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266 if choosed_candidate == peer_best_candidate: |
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267 # peer_best_candidate was choosed from the candidates we have sent |
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268 # so our_candidate is true if choosed_candidate is peer_best_candidate |
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269 our_candidate = True |
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270 # than also mean that best_candidate must be discarded ! |
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271 try: |
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272 best_candidate.discard() |
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273 except AttributeError: # but it can be None |
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274 pass |
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275 else: |
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276 our_candidate = False |
1560 | 277 |
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278 log.info( |
3028 | 279 "Socks5 negociation successful, {who} candidate will be used: {candidate}".format( |
280 who="our" if our_candidate else "other peer", | |
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281 candidate=choosed_candidate, |
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282 ) |
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283 ) |
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284 del transport_data["best_candidate"] |
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285 del transport_data["peer_best_candidate"] |
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286 |
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287 if choosed_candidate.type == self._s5b.TYPE_PROXY: |
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288 # the stream transfer need to wait for proxy activation |
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289 # (see XEP-0260 § 2.4) |
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290 if our_candidate: |
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291 d = self._s5b.connectCandidate( |
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292 client, choosed_candidate, transport_data["session_hash"] |
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293 ) |
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294 d.addCallback( |
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295 lambda __: choosed_candidate.activate( |
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296 transport_data["sid"], session["peer_jid"], client |
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297 ) |
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298 ) |
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299 args = [client, choosed_candidate, session, content_name] |
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300 d.addCallbacks( |
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301 self._proxyActivatedCb, self._proxyActivatedEb, args, None, args |
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302 ) |
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303 else: |
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304 # this Deferred will be called when we'll receive activation confirmation from other peer |
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305 d = transport_data["activation_d"] = defer.Deferred() |
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306 else: |
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307 d = defer.succeed(None) |
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308 |
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309 if content_data["senders"] == session["role"]: |
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310 # we can now start the stream transfer (or start it after proxy activation) |
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311 d.addCallback( |
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312 lambda __: choosed_candidate.startTransfer( |
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313 transport_data["session_hash"] |
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314 ) |
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315 ) |
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316 d.addErrback(self._startEb, session, content_name, client) |
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317 |
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318 def _startEb(self, fail, session, content_name, client): |
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319 """Called when it's not possible to start the transfer |
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320 |
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321 Will try to fallback to IBB |
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322 """ |
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323 try: |
3028 | 324 reason = str(fail.value) |
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325 except AttributeError: |
3028 | 326 reason = str(fail) |
327 log.warning("Cant start transfert, we'll try fallback method: {}".format(reason)) | |
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328 self.doFallback(session, content_name, client) |
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329 |
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330 def _candidateInfo( |
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331 self, candidate_elt, session, content_name, transport_data, client |
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332 ): |
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333 """Called when best candidate has been received from peer (or if none is working) |
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334 |
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335 @param candidate_elt(domish.Element): candidate-used or candidate-error element |
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336 (see XEP-0260 §2.3) |
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337 @param session(dict): session data |
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338 @param content_name(unicode): name of the current content |
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339 @param transport_data(dict): transport data |
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340 @param client(unicode): %(doc_client)s |
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341 """ |
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342 if candidate_elt.name == "candidate-error": |
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343 # candidate-error, no candidate worked |
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344 transport_data["peer_best_candidate"] = None |
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345 else: |
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346 # candidate-used, one candidate was choosed |
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347 try: |
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348 cid = candidate_elt.attributes["cid"] |
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349 except KeyError: |
3028 | 350 log.warning("No cid found in <candidate-used>") |
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351 raise exceptions.DataError |
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352 try: |
3028 | 353 candidate = next(( |
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354 c for c in transport_data["candidates"] if c.id == cid |
3028 | 355 )) |
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356 except StopIteration: |
3028 | 357 log.warning("Given cid doesn't correspond to any known candidate !") |
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358 raise exceptions.DataError # TODO: send an error to other peer, and use better exception |
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359 except KeyError: |
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360 # a transport-info can also be intentionaly sent too early by other peer |
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361 # but there is little probability |
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362 log.error( |
3028 | 363 '"candidates" key doesn\'t exists in transport_data, it should at this point' |
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364 ) |
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365 raise exceptions.InternalError |
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366 # at this point we have the candidate choosed by other peer |
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367 transport_data["peer_best_candidate"] = candidate |
3028 | 368 log.info("Other peer best candidate: {}".format(candidate)) |
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369 |
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370 del transport_data["candidates"] |
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371 self._checkCandidates(session, content_name, transport_data, client) |
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372 |
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373 def _proxyActivationInfo( |
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374 self, proxy_elt, session, content_name, transport_data, client |
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375 ): |
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376 """Called when proxy has been activated (or has sent an error) |
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377 |
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378 @param proxy_elt(domish.Element): <activated/> or <proxy-error/> element |
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379 (see XEP-0260 §2.4) |
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380 @param session(dict): session data |
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381 @param content_name(unicode): name of the current content |
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382 @param transport_data(dict): transport data |
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383 @param client(unicode): %(doc_client)s |
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384 """ |
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385 try: |
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386 activation_d = transport_data.pop("activation_d") |
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387 except KeyError: |
3028 | 388 log.warning("Received unexpected transport-info for proxy activation") |
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389 |
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390 if proxy_elt.name == "activated": |
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391 activation_d.callback(None) |
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392 else: |
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393 activation_d.errback(ProxyError()) |
1560 | 394 |
395 @defer.inlineCallbacks | |
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396 def jingleHandler(self, client, action, session, content_name, transport_elt): |
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397 content_data = session["contents"][content_name] |
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398 transport_data = content_data["transport_data"] |
1560 | 399 |
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400 if action in (self._j.A_ACCEPTED_ACK, self._j.A_PREPARE_RESPONDER): |
1560 | 401 pass |
402 | |
403 elif action == self._j.A_SESSION_ACCEPT: | |
404 # initiator side, we select a candidate in the ones sent by responder | |
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405 assert "peer_candidates" not in transport_data |
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406 transport_data["peer_candidates"] = self._parseCandidates(transport_elt) |
1560 | 407 |
408 elif action == self._j.A_START: | |
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409 session_hash = transport_data["session_hash"] |
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410 peer_candidates = transport_data["peer_candidates"] |
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411 stream_object = content_data["stream_object"] |
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412 self._s5b.associateStreamObject(client, session_hash, stream_object) |
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413 stream_d = transport_data.pop("stream_d") |
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414 stream_d.chainDeferred(content_data["finished_d"]) |
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415 peer_session_hash = transport_data["peer_session_hash"] |
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416 d = self._s5b.getBestCandidate( |
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417 client, peer_candidates, session_hash, peer_session_hash |
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418 ) |
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419 d.addCallback( |
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420 self._foundPeerCandidate, session, transport_data, content_name, client |
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421 ) |
1560 | 422 |
423 elif action == self._j.A_SESSION_INITIATE: | |
424 # responder side, we select a candidate in the ones sent by initiator | |
425 # and we give our candidates | |
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426 assert "peer_candidates" not in transport_data |
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427 sid = transport_data["sid"] = transport_elt["sid"] |
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428 session_hash = transport_data["session_hash"] = self._s5b.getSessionHash( |
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429 session["local_jid"], session["peer_jid"], sid |
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430 ) |
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431 peer_session_hash = transport_data[ |
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432 "peer_session_hash" |
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433 ] = self._s5b.getSessionHash( |
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434 session["peer_jid"], session["local_jid"], sid |
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435 ) # requester and target are inversed for peer candidates |
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436 peer_candidates = transport_data["peer_candidates"] = self._parseCandidates( |
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437 transport_elt |
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438 ) |
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439 stream_object = content_data["stream_object"] |
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440 stream_d = self._s5b.registerHash(client, session_hash, stream_object) |
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441 stream_d.chainDeferred(content_data["finished_d"]) |
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442 d = self._s5b.getBestCandidate( |
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443 client, peer_candidates, session_hash, peer_session_hash |
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444 ) |
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445 d.addCallback( |
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446 self._foundPeerCandidate, session, transport_data, content_name, client |
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447 ) |
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448 candidates = yield self._s5b.getCandidates(client, session["local_jid"]) |
1560 | 449 # we remove duplicate candidates |
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450 candidates = [ |
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451 candidate for candidate in candidates if candidate not in peer_candidates |
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452 ] |
1560 | 453 |
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454 transport_data["candidates"] = candidates |
1560 | 455 # we can now build a new <transport> element with our candidates |
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456 transport_elt = self._buildCandidates( |
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457 session, candidates, sid, session_hash, client |
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458 ) |
1560 | 459 |
460 elif action == self._j.A_TRANSPORT_INFO: | |
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461 # transport-info can be about candidate or proxy activation |
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462 candidate_elt = None |
1560 | 463 |
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464 for method, names in ( |
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465 (self._candidateInfo, ("candidate-used", "candidate-error")), |
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466 (self._proxyActivationInfo, ("activated", "proxy-error")), |
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467 ): |
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468 for name in names: |
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469 try: |
3028 | 470 candidate_elt = next(transport_elt.elements(NS_JINGLE_S5B, name)) |
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471 except StopIteration: |
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472 continue |
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473 else: |
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474 method( |
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475 candidate_elt, session, content_name, transport_data, client |
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476 ) |
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477 break |
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478 |
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479 if candidate_elt is None: |
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480 log.warning( |
3028 | 481 "Unexpected transport element: {}".format(transport_elt.toXml()) |
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482 ) |
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483 elif action == self._j.A_DESTROY: |
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484 # the transport is replaced (fallback ?), We need mainly to kill XEP-0065 session. |
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485 # note that sid argument is not necessary for sessions created by this plugin |
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486 self._s5b.killSession(None, transport_data["session_hash"], None, client) |
1560 | 487 else: |
3028 | 488 log.warning("FIXME: unmanaged action {}".format(action)) |
1560 | 489 |
490 defer.returnValue(transport_elt) | |
491 | |
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492 def jingleTerminate(self, client, action, session, content_name, reason_elt): |
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493 if reason_elt.decline: |
3028 | 494 log.debug("Session declined, deleting S5B session") |
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495 # we just need to clean the S5B session if it is declined |
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496 content_data = session["contents"][content_name] |
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497 transport_data = content_data["transport_data"] |
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498 self._s5b.killSession(None, transport_data["session_hash"], None, client) |
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499 |
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500 def _doFallback(self, feature_checked, session, content_name, client): |
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501 """Do the fallback, method called once feature is checked |
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502 |
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503 @param feature_checked(bool): True if other peer can do IBB |
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504 """ |
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505 if not feature_checked: |
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506 log.warning( |
3028 | 507 "Other peer can't manage jingle IBB, be have to terminate the session" |
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508 ) |
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509 self._j.terminate(client, self._j.REASON_CONNECTIVITY_ERROR, session) |
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510 else: |
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511 self._j.transportReplace( |
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512 client, self._jingle_ibb.NAMESPACE, session, content_name |
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513 ) |
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514 |
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515 def doFallback(self, session, content_name, client): |
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516 """Fallback to IBB transport, used in last resort |
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517 |
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518 @param session(dict): session data |
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519 @param content_name(unicode): name of the current content |
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520 @param client(unicode): %(doc_client)s |
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521 """ |
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522 if session["role"] != self._j.ROLE_INITIATOR: |
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523 # only initiator must do the fallback, see XEP-0260 §3 |
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524 return |
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525 if self._jingle_ibb is None: |
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526 log.warning( |
3028 | 527 "Jingle IBB (XEP-0261) plugin is not available, we have to close the session" |
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528 ) |
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529 self._j.terminate(client, self._j.REASON_CONNECTIVITY_ERROR, session) |
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530 else: |
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531 d = self.host.hasFeature( |
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532 client, self._jingle_ibb.NAMESPACE, session["peer_jid"] |
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533 ) |
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534 d.addCallback(self._doFallback, session, content_name, client) |
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535 return d |
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536 |
1560 | 537 |
3028 | 538 @implementer(iwokkel.IDisco) |
1560 | 539 class XEP_0260_handler(XMPPHandler): |
540 | |
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541 def getDiscoInfo(self, requestor, target, nodeIdentifier=""): |
1560 | 542 return [disco.DiscoFeature(NS_JINGLE_S5B)] |
543 | |
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544 def getDiscoItems(self, requestor, target, nodeIdentifier=""): |
1560 | 545 return [] |