Mercurial > libervia-backend
annotate libervia/backend/plugins/plugin_xep_0260.py @ 4340:ea72364131d5 default tip @
doc (components): Update Email Gateway documentation:
A section has been added to explain how attachments are handled.
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author | Goffi <goffi@goffi.org> |
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date | Tue, 03 Dec 2024 00:53:18 +0100 |
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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 | |
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20 from libervia.backend.core.i18n import _ |
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21 from libervia.backend.core.constants import Const as C |
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22 from libervia.backend.core.log import getLogger |
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23 from libervia.backend.plugins.plugin_xep_0166.models import BaseTransportHandler |
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24 |
1560 | 25 log = getLogger(__name__) |
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26 from libervia.backend.core import exceptions |
1560 | 27 from wokkel import disco, iwokkel |
3028 | 28 from zope.interface import implementer |
1560 | 29 from twisted.words.xish import domish |
30 from twisted.words.protocols.jabber import jid | |
31 from twisted.internet import defer | |
32 import uuid | |
33 | |
34 try: | |
35 from twisted.words.protocols.xmlstream import XMPPHandler | |
36 except ImportError: | |
37 from wokkel.subprotocols import XMPPHandler | |
38 | |
39 | |
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40 NS_JINGLE_S5B = "urn:xmpp:jingle:transports:s5b:1" |
1560 | 41 |
42 PLUGIN_INFO = { | |
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43 C.PI_NAME: "Jingle SOCKS5 Bytestreams", |
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44 C.PI_IMPORT_NAME: "XEP-0260", |
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45 C.PI_TYPE: "XEP", |
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46 C.PI_MODES: C.PLUG_MODE_BOTH, |
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47 C.PI_PROTOCOLS: ["XEP-0260"], |
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48 C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0065"], |
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49 C.PI_RECOMMENDATIONS: ["XEP-0261"], # needed for fallback |
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50 C.PI_MAIN: "XEP_0260", |
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51 C.PI_HANDLER: "yes", |
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52 C.PI_DESCRIPTION: _("""Implementation of Jingle SOCKS5 Bytestreams"""), |
1560 | 53 } |
54 | |
55 | |
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56 class ProxyError(Exception): |
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57 def __str__(self): |
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58 return "an error happened while trying to use the proxy" |
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59 |
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60 |
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61 class XEP_0260(BaseTransportHandler): |
1560 | 62 # TODO: udp handling |
63 | |
64 def __init__(self, host): | |
65 log.info(_("plugin Jingle SOCKS5 Bytestreams")) | |
66 self.host = host | |
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67 self._j = host.plugins["XEP-0166"] # shortcut to access jingle |
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68 self._s5b = host.plugins["XEP-0065"] # and socks5 bytestream |
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69 try: |
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70 self._jingle_ibb = host.plugins["XEP-0261"] |
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71 except KeyError: |
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72 self._jingle_ibb = None |
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73 self._j.register_transport(NS_JINGLE_S5B, self._j.TRANSPORT_STREAMING, self, 100) |
1560 | 74 |
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75 def get_handler(self, client): |
1560 | 76 return XEP_0260_handler() |
77 | |
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78 def _parse_candidates(self, transport_elt): |
1560 | 79 """Parse <candidate> elements |
80 | |
81 @param transport_elt(domish.Element): parent <transport> element | |
82 @return (list[plugin_xep_0065.Candidate): list of parsed candidates | |
83 """ | |
84 candidates = [] | |
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85 for candidate_elt in transport_elt.elements(NS_JINGLE_S5B, "candidate"): |
1560 | 86 try: |
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87 cid = candidate_elt["cid"] |
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88 host = candidate_elt["host"] |
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89 jid_ = jid.JID(candidate_elt["jid"]) |
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90 port = int(candidate_elt.getAttribute("port", 1080)) |
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91 priority = int(candidate_elt["priority"]) |
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92 type_ = candidate_elt.getAttribute("type", self._s5b.TYPE_DIRECT) |
1560 | 93 except (KeyError, ValueError): |
94 raise exceptions.DataError() | |
95 candidate = self._s5b.Candidate(host, port, type_, priority, jid_, cid) | |
96 candidates.append(candidate) | |
97 # self._s5b.registerCandidate(candidate) | |
98 return candidates | |
99 | |
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100 def _build_candidates( |
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101 self, session, candidates, sid, session_hash, client, mode=None |
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102 ): |
1560 | 103 """Build <transport> element with candidates |
104 | |
105 @param session(dict): jingle session data | |
106 @param candidates(iterator[plugin_xep_0065.Candidate]): iterator of candidates to add | |
107 @param sid(unicode): transport stream id | |
108 @param client: %(doc_client)s | |
109 @param mode(str, None): 'tcp' or 'udp', or None to have no attribute | |
110 @return (domish.Element): parent <transport> element where <candidate> elements must be added | |
111 """ | |
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112 proxy = next( |
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113 ( |
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114 candidate |
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115 for candidate in candidates |
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116 if candidate.type == self._s5b.TYPE_PROXY |
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117 ), |
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118 None, |
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119 ) |
1560 | 120 transport_elt = domish.Element((NS_JINGLE_S5B, "transport")) |
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121 transport_elt["sid"] = sid |
1560 | 122 if proxy is not None: |
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123 transport_elt["dstaddr"] = session_hash |
1560 | 124 if mode is not None: |
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125 transport_elt["mode"] = "tcp" # XXX: we only manage tcp for now |
1560 | 126 |
127 for candidate in candidates: | |
3028 | 128 log.debug("Adding candidate: {}".format(candidate)) |
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129 candidate_elt = transport_elt.addElement("candidate", NS_JINGLE_S5B) |
1560 | 130 if candidate.id is None: |
3028 | 131 candidate.id = str(uuid.uuid4()) |
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132 candidate_elt["cid"] = candidate.id |
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133 candidate_elt["host"] = candidate.host |
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134 candidate_elt["jid"] = candidate.jid.full() |
3028 | 135 candidate_elt["port"] = str(candidate.port) |
136 candidate_elt["priority"] = str(candidate.priority) | |
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137 candidate_elt["type"] = candidate.type |
1560 | 138 return transport_elt |
139 | |
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140 async def jingle_session_init(self, client, session, content_name): |
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141 content_data = session["contents"][content_name] |
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142 transport_data = content_data["transport_data"] |
3028 | 143 sid = transport_data["sid"] = str(uuid.uuid4()) |
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144 session_hash = transport_data["session_hash"] = self._s5b.get_session_hash( |
3028 | 145 session["local_jid"], session["peer_jid"], sid |
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146 ) |
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147 transport_data["peer_session_hash"] = self._s5b.get_session_hash( |
3028 | 148 session["peer_jid"], session["local_jid"], sid |
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149 ) # requester and target are inversed for peer candidates |
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150 transport_data["stream_d"] = self._s5b.register_hash(client, session_hash, None) |
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151 candidates = transport_data["candidates"] = await self._s5b.get_candidates( |
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152 client, session["local_jid"] |
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153 ) |
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154 mode = "tcp" # XXX: we only manage tcp for now |
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155 transport_elt = self._build_candidates( |
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156 session, candidates, sid, session_hash, client, mode |
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157 ) |
1560 | 158 |
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159 return transport_elt |
1560 | 160 |
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161 def _proxy_activated_cb( |
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162 self, iq_result_elt, client, candidate, session, content_name |
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163 ): |
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164 """Called when activation confirmation has been received from proxy |
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165 |
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166 cf XEP-0260 § 2.4 |
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167 """ |
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168 # now that the proxy is activated, we have to inform other peer |
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169 content_data = session["contents"][content_name] |
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170 iq_elt, transport_elt = self._j.build_action( |
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171 client, self._j.A_TRANSPORT_INFO, session, content_name |
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172 ) |
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173 transport_elt["sid"] = content_data["transport_data"]["sid"] |
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174 activated_elt = transport_elt.addElement("activated") |
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175 activated_elt["cid"] = candidate.id |
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176 iq_elt.send() |
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177 |
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178 def _proxy_activated_eb(self, stanza_error, client, candidate, session, content_name): |
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179 """Called when activation error has been received from proxy |
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180 |
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181 cf XEP-0260 § 2.4 |
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182 """ |
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183 # TODO: fallback to IBB |
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184 # now that the proxy is activated, we have to inform other peer |
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185 content_data = session["contents"][content_name] |
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186 iq_elt, transport_elt = self._j.build_action( |
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187 client, self._j.A_TRANSPORT_INFO, session, content_name |
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188 ) |
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189 transport_elt["sid"] = content_data["transport_data"]["sid"] |
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190 transport_elt.addElement("proxy-error") |
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191 iq_elt.send() |
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192 log.warning( |
3028 | 193 "Can't activate proxy, we need to fallback to IBB: {reason}".format( |
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194 reason=stanza_error.value.condition |
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195 ) |
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196 ) |
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197 self.do_fallback(session, content_name, client) |
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198 |
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199 def _found_peer_candidate( |
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200 self, candidate, session, transport_data, content_name, client |
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201 ): |
1560 | 202 """Called when the best candidate from other peer is found |
203 | |
204 @param candidate(XEP_0065.Candidate, None): selected candidate, | |
205 or None if no candidate is accessible | |
206 @param session(dict): session data | |
207 @param transport_data(dict): transport data | |
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208 @param content_name(unicode): name of the current content |
1560 | 209 @param client(unicode): %(doc_client)s |
210 """ | |
211 | |
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212 content_data = session["contents"][content_name] |
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213 transport_data["best_candidate"] = candidate |
1560 | 214 # we need to disconnect all non selected candidates before removing them |
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215 for c in transport_data["peer_candidates"]: |
1560 | 216 if c is None or c is candidate: |
217 continue | |
218 c.discard() | |
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219 del transport_data["peer_candidates"] |
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220 iq_elt, transport_elt = self._j.build_action( |
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221 client, self._j.A_TRANSPORT_INFO, session, content_name |
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222 ) |
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223 transport_elt["sid"] = content_data["transport_data"]["sid"] |
1560 | 224 if candidate is None: |
3028 | 225 log.warning("Can't connect to any peer candidate") |
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226 candidate_elt = transport_elt.addElement("candidate-error") |
1560 | 227 else: |
3028 | 228 log.info("Found best peer candidate: {}".format(str(candidate))) |
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229 candidate_elt = transport_elt.addElement("candidate-used") |
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230 candidate_elt["cid"] = candidate.id |
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231 iq_elt.send() # TODO: check result stanza |
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232 self._check_candidates(session, content_name, transport_data, client) |
1560 | 233 |
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234 def _check_candidates(self, session, content_name, transport_data, client): |
1560 | 235 """Called when a candidate has been choosed |
236 | |
237 if we have both candidates, we select one, or fallback to an other transport | |
238 @param session(dict): session data | |
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239 @param content_name(unicode): name of the current content |
1560 | 240 @param transport_data(dict): transport data |
241 @param client(unicode): %(doc_client)s | |
242 """ | |
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243 content_data = session["contents"][content_name] |
1560 | 244 try: |
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245 best_candidate = transport_data["best_candidate"] |
1560 | 246 except KeyError: |
247 # we have not our best candidate yet | |
248 return | |
249 try: | |
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250 peer_best_candidate = transport_data["peer_best_candidate"] |
1560 | 251 except KeyError: |
252 # we have not peer best candidate yet | |
253 return | |
254 | |
255 # at this point we have both candidates, it's time to choose one | |
256 if best_candidate is None or peer_best_candidate is None: | |
257 choosed_candidate = best_candidate or peer_best_candidate | |
258 else: | |
259 if best_candidate.priority == peer_best_candidate.priority: | |
260 # same priority, we choose initiator one according to XEP-0260 §2.4 #4 | |
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261 log.debug( |
3028 | 262 "Candidates have same priority, we select the one choosed by initiator" |
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263 ) |
3028 | 264 if session["initiator"] == session["local_jid"]: |
1560 | 265 choosed_candidate = best_candidate |
266 else: | |
267 choosed_candidate = peer_best_candidate | |
268 else: | |
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269 choosed_candidate = max( |
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270 best_candidate, peer_best_candidate, key=lambda c: c.priority |
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271 ) |
1560 | 272 |
273 if choosed_candidate is None: | |
3028 | 274 log.warning("Socks5 negociation failed, we need to fallback to IBB") |
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275 self.do_fallback(session, content_name, client) |
1560 | 276 else: |
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277 if choosed_candidate == peer_best_candidate: |
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278 # peer_best_candidate was choosed from the candidates we have sent |
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279 # so our_candidate is true if choosed_candidate is peer_best_candidate |
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280 our_candidate = True |
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281 # than also mean that best_candidate must be discarded ! |
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282 try: |
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283 best_candidate.discard() |
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284 except AttributeError: # but it can be None |
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285 pass |
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286 else: |
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287 our_candidate = False |
1560 | 288 |
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289 log.info( |
3028 | 290 "Socks5 negociation successful, {who} candidate will be used: {candidate}".format( |
291 who="our" if our_candidate else "other peer", | |
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292 candidate=choosed_candidate, |
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293 ) |
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294 ) |
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295 del transport_data["best_candidate"] |
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296 del transport_data["peer_best_candidate"] |
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297 |
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298 if choosed_candidate.type == self._s5b.TYPE_PROXY: |
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299 # the stream transfer need to wait for proxy activation |
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300 # (see XEP-0260 § 2.4) |
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301 if our_candidate: |
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302 d = self._s5b.connect_candidate( |
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303 client, choosed_candidate, transport_data["session_hash"] |
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304 ) |
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305 d.addCallback( |
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306 lambda __: choosed_candidate.activate( |
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307 transport_data["sid"], session["peer_jid"], client |
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308 ) |
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309 ) |
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310 args = [client, choosed_candidate, session, content_name] |
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311 d.addCallbacks( |
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312 self._proxy_activated_cb, |
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313 self._proxy_activated_eb, |
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314 args, |
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315 None, |
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316 args, |
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317 ) |
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318 else: |
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319 # this Deferred will be called when we'll receive activation confirmation from other peer |
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320 d = transport_data["activation_d"] = defer.Deferred() |
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321 else: |
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322 d = defer.succeed(None) |
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323 |
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324 if content_data["senders"] == session["role"]: |
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325 # we can now start the stream transfer (or start it after proxy activation) |
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326 d.addCallback( |
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327 lambda __: choosed_candidate.start_transfer( |
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328 transport_data["session_hash"] |
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329 ) |
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330 ) |
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331 d.addErrback(self._start_eb, session, content_name, client) |
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332 |
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333 def _start_eb(self, fail, session, content_name, client): |
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334 """Called when it's not possible to start the transfer |
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335 |
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336 Will try to fallback to IBB |
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337 """ |
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338 try: |
3028 | 339 reason = str(fail.value) |
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340 except AttributeError: |
3028 | 341 reason = str(fail) |
342 log.warning("Cant start transfert, we'll try fallback method: {}".format(reason)) | |
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343 self.do_fallback(session, content_name, client) |
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344 |
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345 def _candidate_info( |
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346 self, candidate_elt, session, content_name, transport_data, client |
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347 ): |
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348 """Called when best candidate has been received from peer (or if none is working) |
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349 |
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350 @param candidate_elt(domish.Element): candidate-used or candidate-error element |
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351 (see XEP-0260 §2.3) |
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352 @param session(dict): session data |
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353 @param content_name(unicode): name of the current content |
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354 @param transport_data(dict): transport data |
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355 @param client(unicode): %(doc_client)s |
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356 """ |
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357 if candidate_elt.name == "candidate-error": |
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358 # candidate-error, no candidate worked |
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359 transport_data["peer_best_candidate"] = None |
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360 else: |
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361 # candidate-used, one candidate was choosed |
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362 try: |
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363 cid = candidate_elt.attributes["cid"] |
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364 except KeyError: |
3028 | 365 log.warning("No cid found in <candidate-used>") |
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366 raise exceptions.DataError |
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367 try: |
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368 candidate = next((c for c in transport_data["candidates"] if c.id == cid)) |
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369 except StopIteration: |
3028 | 370 log.warning("Given cid doesn't correspond to any known candidate !") |
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371 raise exceptions.DataError # TODO: send an error to other peer, and use better exception |
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372 except KeyError: |
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373 # a transport-info can also be intentionaly sent too early by other peer |
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374 # but there is little probability |
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375 log.error( |
3028 | 376 '"candidates" key doesn\'t exists in transport_data, it should at this point' |
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377 ) |
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378 raise exceptions.InternalError |
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379 # at this point we have the candidate choosed by other peer |
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380 transport_data["peer_best_candidate"] = candidate |
3028 | 381 log.info("Other peer best candidate: {}".format(candidate)) |
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382 |
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383 del transport_data["candidates"] |
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384 self._check_candidates(session, content_name, transport_data, client) |
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385 |
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386 def _proxy_activation_info( |
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387 self, proxy_elt, session, content_name, transport_data, client |
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388 ): |
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389 """Called when proxy has been activated (or has sent an error) |
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390 |
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391 @param proxy_elt(domish.Element): <activated/> or <proxy-error/> element |
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392 (see XEP-0260 §2.4) |
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393 @param session(dict): session data |
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394 @param content_name(unicode): name of the current content |
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395 @param transport_data(dict): transport data |
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396 @param client(unicode): %(doc_client)s |
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397 """ |
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398 try: |
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399 activation_d = transport_data.pop("activation_d") |
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400 except KeyError: |
3028 | 401 log.warning("Received unexpected transport-info for proxy activation") |
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402 |
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403 if proxy_elt.name == "activated": |
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404 activation_d.callback(None) |
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405 else: |
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406 activation_d.errback(ProxyError()) |
1560 | 407 |
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408 async def jingle_handler(self, client, action, session, content_name, transport_elt): |
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409 content_data = session["contents"][content_name] |
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410 transport_data = content_data["transport_data"] |
1560 | 411 |
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412 if action in (self._j.A_ACCEPTED_ACK, self._j.A_PREPARE_RESPONDER): |
1560 | 413 pass |
414 | |
415 elif action == self._j.A_SESSION_ACCEPT: | |
416 # initiator side, we select a candidate in the ones sent by responder | |
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417 assert "peer_candidates" not in transport_data |
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418 transport_data["peer_candidates"] = self._parse_candidates(transport_elt) |
1560 | 419 |
420 elif action == self._j.A_START: | |
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421 session_hash = transport_data["session_hash"] |
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422 peer_candidates = transport_data["peer_candidates"] |
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423 stream_object = content_data["stream_object"] |
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424 self._s5b.associate_stream_object(client, session_hash, stream_object) |
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425 stream_d = transport_data.pop("stream_d") |
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426 stream_d.chainDeferred(content_data["finished_d"]) |
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427 peer_session_hash = transport_data["peer_session_hash"] |
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428 d = self._s5b.get_best_candidate( |
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429 client, peer_candidates, session_hash, peer_session_hash |
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430 ) |
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431 d.addCallback( |
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432 self._found_peer_candidate, session, transport_data, content_name, client |
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433 ) |
1560 | 434 |
435 elif action == self._j.A_SESSION_INITIATE: | |
436 # responder side, we select a candidate in the ones sent by initiator | |
437 # and we give our candidates | |
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438 assert "peer_candidates" not in transport_data |
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439 sid = transport_data["sid"] = transport_elt["sid"] |
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440 session_hash = transport_data["session_hash"] = self._s5b.get_session_hash( |
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441 session["local_jid"], session["peer_jid"], sid |
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442 ) |
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443 peer_session_hash = transport_data["peer_session_hash"] = ( |
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444 self._s5b.get_session_hash(session["peer_jid"], session["local_jid"], sid) |
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445 ) # requester and target are inversed for peer candidates |
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446 peer_candidates = transport_data["peer_candidates"] = self._parse_candidates( |
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447 transport_elt |
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448 ) |
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449 stream_object = content_data["stream_object"] |
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450 stream_d = self._s5b.register_hash(client, session_hash, stream_object) |
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451 stream_d.chainDeferred(content_data["finished_d"]) |
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452 d = self._s5b.get_best_candidate( |
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453 client, peer_candidates, session_hash, peer_session_hash |
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454 ) |
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455 d.addCallback( |
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456 self._found_peer_candidate, session, transport_data, content_name, client |
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457 ) |
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458 candidates = await self._s5b.get_candidates(client, session["local_jid"]) |
1560 | 459 # we remove duplicate candidates |
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460 candidates = [ |
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461 candidate for candidate in candidates if candidate not in peer_candidates |
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462 ] |
1560 | 463 |
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464 transport_data["candidates"] = candidates |
1560 | 465 # we can now build a new <transport> element with our candidates |
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466 transport_elt = self._build_candidates( |
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467 session, candidates, sid, session_hash, client |
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468 ) |
1560 | 469 |
470 elif action == self._j.A_TRANSPORT_INFO: | |
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471 # transport-info can be about candidate or proxy activation |
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472 candidate_elt = None |
1560 | 473 |
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474 for method, names in ( |
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475 (self._candidate_info, ("candidate-used", "candidate-error")), |
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476 (self._proxy_activation_info, ("activated", "proxy-error")), |
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477 ): |
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478 for name in names: |
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479 try: |
3028 | 480 candidate_elt = next(transport_elt.elements(NS_JINGLE_S5B, name)) |
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481 except StopIteration: |
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482 continue |
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483 else: |
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484 method( |
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485 candidate_elt, session, content_name, transport_data, client |
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486 ) |
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487 break |
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488 |
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489 if candidate_elt is None: |
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490 log.warning( |
3028 | 491 "Unexpected transport element: {}".format(transport_elt.toXml()) |
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492 ) |
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493 elif action == self._j.A_DESTROY: |
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494 # the transport is replaced (fallback ?), We need mainly to kill XEP-0065 session. |
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495 # note that sid argument is not necessary for sessions created by this plugin |
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496 self._s5b.kill_session(None, transport_data["session_hash"], None, client) |
1560 | 497 else: |
3028 | 498 log.warning("FIXME: unmanaged action {}".format(action)) |
1560 | 499 |
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500 return transport_elt |
1560 | 501 |
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502 def jingle_terminate(self, client, action, session, content_name, reason_elt): |
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503 if reason_elt.decline: |
3028 | 504 log.debug("Session declined, deleting S5B session") |
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505 # we just need to clean the S5B session if it is declined |
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506 content_data = session["contents"][content_name] |
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507 transport_data = content_data["transport_data"] |
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508 self._s5b.kill_session(None, transport_data["session_hash"], None, client) |
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509 |
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510 def _do_fallback(self, feature_checked, session, content_name, client): |
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511 """Do the fallback, method called once feature is checked |
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512 |
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513 @param feature_checked(bool): True if other peer can do IBB |
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514 """ |
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515 if not feature_checked: |
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516 log.warning( |
3028 | 517 "Other peer can't manage jingle IBB, be have to terminate the session" |
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518 ) |
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519 self._j.terminate(client, self._j.REASON_CONNECTIVITY_ERROR, session) |
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520 else: |
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521 self._j.transport_replace( |
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522 client, self._jingle_ibb.NAMESPACE, session, content_name |
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523 ) |
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524 |
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525 def do_fallback(self, session, content_name, client): |
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526 """Fallback to IBB transport, used in last resort |
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527 |
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528 @param session(dict): session data |
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529 @param content_name(unicode): name of the current content |
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530 @param client(unicode): %(doc_client)s |
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531 """ |
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532 if session["role"] != self._j.ROLE_INITIATOR: |
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533 # only initiator must do the fallback, see XEP-0260 §3 |
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534 return |
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535 if self._jingle_ibb is None: |
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536 log.warning( |
3028 | 537 "Jingle IBB (XEP-0261) plugin is not available, we have to close the session" |
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538 ) |
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539 self._j.terminate(client, self._j.REASON_CONNECTIVITY_ERROR, session) |
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540 else: |
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541 d = self.host.hasFeature( |
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542 client, self._jingle_ibb.NAMESPACE, session["peer_jid"] |
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543 ) |
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544 d.addCallback(self._do_fallback, session, content_name, client) |
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545 return d |
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546 |
1560 | 547 |
3028 | 548 @implementer(iwokkel.IDisco) |
1560 | 549 class XEP_0260_handler(XMPPHandler): |
550 | |
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551 def getDiscoInfo(self, requestor, target, nodeIdentifier=""): |
1560 | 552 return [disco.DiscoFeature(NS_JINGLE_S5B)] |
553 | |
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554 def getDiscoItems(self, requestor, target, nodeIdentifier=""): |
1560 | 555 return [] |