Mercurial > libervia-pubsub
annotate sat_pubsub/delegation.py @ 460:607616f9ef5b
backend: new `server_jid` option:
Server domain must be known to validate requests, this can be done explicitely by using the
`server_jid` option. If this option is not set, the server domain is found:
- by using the `from` name of the initial delegation advertising message
- or it fallbacks to using the part after initial `.` (`pubsub.example.org` would give
`example.org`)
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Fri, 15 Oct 2021 09:32:07 +0200 |
| parents | cebcb7f56889 |
| children | b544109ab4c4 |
| rev | line source |
|---|---|
| 414 | 1 #!/usr/bin/env python3 |
| 242 | 2 # |
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3 # Copyright (c) 2015-2021 Jérôme Poisson |
| 242 | 4 |
| 5 | |
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6 # This program is free software: you can redistribute it and/or modify |
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7 # it under the terms of the GNU Affero General Public License as published by |
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8 # the Free Software Foundation, either version 3 of the License, or |
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9 # (at your option) any later version. |
| 242 | 10 |
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11 # This program is distributed in the hope that it will be useful, |
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 # GNU Affero General Public License for more details. |
| 242 | 15 |
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16 # You should have received a copy of the GNU Affero General Public License |
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 242 | 18 |
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19 # --- |
| 242 | 20 |
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21 # This module implements XEP-0355 (Namespace delegation) to use SàT Pubsub as PEP service |
| 242 | 22 |
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23 from wokkel.subprotocols import XMPPHandler |
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24 from wokkel import pubsub |
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25 from wokkel import data_form |
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26 from wokkel import disco, iwokkel, generic |
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27 from wokkel.iwokkel import IPubSubService |
| 322 | 28 from wokkel import mam |
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29 from twisted.python import log |
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30 from twisted.words.protocols.jabber import ijabber, jid, error |
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31 from twisted.words.protocols.jabber.xmlstream import toResponse |
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32 from twisted.words.xish import domish |
| 414 | 33 from zope.interface import implementer |
| 242 | 34 |
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35 DELEGATION_NS = 'urn:xmpp:delegation:2' |
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36 FORWARDED_NS = 'urn:xmpp:forward:0' |
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37 DELEGATION_ADV_XPATH = '/message/delegation[@xmlns="{}"]'.format(DELEGATION_NS) |
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38 DELEGATION_FWD_XPATH = '/iq[@type="set"]/delegation[@xmlns="{}"]/forwarded[@xmlns="{}"]'.format(DELEGATION_NS, FORWARDED_NS) |
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39 |
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40 DELEGATION_MAIN_SEP = "::" |
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41 DELEGATION_BARE_SEP = ":bare:" |
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42 |
| 322 | 43 TO_HACK = ((IPubSubService, pubsub, "PubSubRequest"), |
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44 (mam.IMAMService, mam, "MAMRequest"), |
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45 (None, disco, "_DiscoRequest")) |
| 322 | 46 |
| 47 | |
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48 class InvalidStanza(Exception): |
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49 pass |
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50 |
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51 |
| 414 | 52 @implementer(iwokkel.IDisco) |
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53 class DelegationsHandler(XMPPHandler): |
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54 _service_hacked = False |
| 242 | 55 |
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56 def __init__(self): |
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57 super(DelegationsHandler, self).__init__() |
| 460 | 58 self.backend = None |
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59 |
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60 def _service_hack(self): |
| 322 | 61 """Patch the request classes of services to track delegated stanzas""" |
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62 # XXX: we need to monkey patch to track origin of the stanza in PubSubRequest. |
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63 # As PubSubRequest from sat.tmp.wokkel.pubsub use _request_class while |
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64 # original wokkel.pubsub use directly pubsub.PubSubRequest, we need to |
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65 # check which version is used before monkeypatching |
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66 for service, module, default_base_cls in TO_HACK: |
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67 module_patched = False |
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68 for handler in self.parent.handlers: |
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69 if not service or service.providedBy(handler): |
| 322 | 70 if hasattr(handler, '_request_class'): |
| 71 request_base_class = handler._request_class | |
| 72 else: | |
| 73 request_base_class = getattr(module, default_base_cls) | |
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74 |
| 322 | 75 class RequestWithDelegation(request_base_class): |
| 76 """A XxxRequest which put an indicator if the stanza comme from delegation""" | |
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77 |
| 322 | 78 @classmethod |
| 79 def fromElement(cls, element): | |
| 80 """Check if element comme from delegation, and set a delegated flags | |
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81 |
| 322 | 82 delegated flag is either False, or it's a jid of the delegating server |
| 83 the delegated flag must be set on element before use | |
| 84 """ | |
| 85 try: | |
| 86 # __getattr__ is overriden in domish.Element, so we use __getattribute__ | |
| 87 delegated = element.__getattribute__('delegated') | |
| 88 except AttributeError: | |
| 89 delegated = False | |
| 90 instance = cls.__base__.fromElement(element) | |
| 91 instance.delegated = delegated | |
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92 try: |
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93 instance.recipient.delegated = delegated |
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94 except (AttributeError, TypeError): |
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95 pass |
| 322 | 96 return instance |
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97 |
| 322 | 98 if hasattr(handler, '_request_class'): |
| 99 handler._request_class = RequestWithDelegation | |
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100 elif not module_patched: |
| 322 | 101 setattr(module, default_base_cls, RequestWithDelegation) |
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102 module_patched = True |
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103 DelegationsHandler._service_hacked = True |
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104 |
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105 def connectionInitialized(self): |
| 460 | 106 self.backend = self.parent.parent.getServiceNamed('backend') |
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107 if not self._service_hacked: |
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108 self._service_hack() |
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109 self.xmlstream.addObserver(DELEGATION_ADV_XPATH, self.onAdvertise) |
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110 self.xmlstream.addObserver(DELEGATION_FWD_XPATH, self._obsWrapper, 0, self.onForward) |
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111 self._current_iqs = {} # dict of iq being handler by delegation |
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112 self._xs_send = self.xmlstream.send |
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113 self.xmlstream.send = self._sendHack |
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114 |
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115 def _sendHack(self, elt): |
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116 """This method is called instead of xmlstream to control sending |
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117 |
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118 @param obj(domsish.Element, unicode, str): obj sent to real xmlstream |
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119 """ |
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120 if isinstance(elt, domish.Element) and elt.name=='iq': |
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121 try: |
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122 id_ = elt.getAttribute('id') |
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123 ori_iq, managed_entity = self._current_iqs[id_] |
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124 if jid.JID(elt['to']) != managed_entity: |
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125 log.msg("IQ id conflict: the managed entity doesn't match (got {got} was expecting {expected})" |
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126 .format(got=jid.JID(elt['to']), expected=managed_entity)) |
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127 raise KeyError |
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128 except KeyError: |
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129 # the iq is not a delegated one |
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130 self._xs_send(elt) |
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131 else: |
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132 del self._current_iqs[id_] |
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133 iq_result_elt = toResponse(ori_iq, 'result') |
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134 fwd_elt = iq_result_elt.addElement('delegation', DELEGATION_NS).addElement('forwarded', FORWARDED_NS) |
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135 fwd_elt.addChild(elt) |
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136 elt.uri = elt.defaultUri = 'jabber:client' |
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137 self._xs_send(iq_result_elt) |
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138 else: |
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139 self._xs_send(elt) |
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140 |
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141 def _obsWrapper(self, observer, stanza): |
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142 """Wrapper to observer which catch StanzaError |
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143 |
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144 @param observer(callable): method to wrap |
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145 """ |
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146 try: |
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147 observer(stanza) |
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148 except error.StanzaError as e: |
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149 error_elt = e.toResponse(stanza) |
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150 self._xs_send(error_elt) |
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151 stanza.handled = True |
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152 |
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153 def onAdvertise(self, message): |
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154 """Manage the <message/> advertising delegations""" |
| 460 | 155 if self.backend.config["server_jid"] is None: |
| 156 # if server_jid is not specified in config, we use the advertising message | |
| 157 # to get it (and replace the one found from this component jid) | |
| 158 self.backend.server_jid = self.backend.config["server_jid"] = jid.JID( | |
| 159 message["from"] | |
| 160 ) | |
| 161 else: | |
| 162 if jid.JID(message["from"]) != self.backend.server_jid: | |
| 163 log.err( | |
| 164 f"Delagation advertising message received from {message['from']}, " | |
| 165 f"while expected server jid is {self.backend.server_jid}, this may " | |
| 166 "be a security threat, please check your configuration and network." | |
| 167 ) | |
| 168 raise error.StanzaError("not-allowed") | |
| 414 | 169 delegation_elt = next(message.elements(DELEGATION_NS, 'delegation')) |
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170 delegated = {} |
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171 for delegated_elt in delegation_elt.elements(DELEGATION_NS): |
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172 try: |
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173 if delegated_elt.name != 'delegated': |
| 414 | 174 raise InvalidStanza('unexpected element {}'.format(delegated_elt.name)) |
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175 try: |
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176 namespace = delegated_elt['namespace'] |
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177 except KeyError: |
| 414 | 178 raise InvalidStanza('was expecting a "namespace" attribute in delegated element') |
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179 delegated[namespace] = [] |
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180 for attribute_elt in delegated_elt.elements(DELEGATION_NS, 'attribute'): |
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181 try: |
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182 delegated[namespace].append(attribute_elt["name"]) |
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183 except KeyError: |
| 414 | 184 raise InvalidStanza('was expecting a "name" attribute in attribute element') |
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185 except InvalidStanza as e: |
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186 log.msg("Invalid stanza received ({})".format(e)) |
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187 |
| 414 | 188 log.msg('delegations updated:\n{}'.format( |
| 189 '\n'.join([" - namespace {}{}".format(ns, | |
| 190 "" if not attributes else " with filtering on {} attribute(s)".format( | |
| 191 ", ".join(attributes))) for ns, attributes in list(delegated.items())]))) | |
| 242 | 192 |
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193 if not pubsub.NS_PUBSUB in delegated: |
| 414 | 194 log.msg("Didn't got pubsub delegation from server, can't act as a PEP service") |
| 242 | 195 |
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196 def onForward(self, iq): |
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197 """Manage forwarded iq |
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198 |
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199 @param iq(domish.Element): full delegation stanza |
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200 """ |
| 460 | 201 if jid.JID(iq['from']) != self.backend.server_jid: |
| 202 log.err("SECURITY WARNING: forwarded stanza doesn't come from our server: " | |
| 203 f"{iq.toXml()}") | |
|
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204 raise error.StanzaError('not-allowed') |
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205 |
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206 try: |
| 414 | 207 delegation_elt = next(iq.elements(DELEGATION_NS, 'delegation')) |
| 208 forwarded_elt = next(delegation_elt.elements(FORWARDED_NS, 'forwarded')) | |
| 209 fwd_iq = next(forwarded_elt.elements('jabber:client', 'iq')) | |
|
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210 except StopIteration: |
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211 raise error.StanzaError('not-acceptable') |
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212 |
|
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213 managed_entity = jid.JID(fwd_iq['from']) |
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214 |
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215 self._current_iqs[fwd_iq['id']] = (iq, managed_entity) |
|
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216 fwd_iq.delegated = True |
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217 |
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218 # we need a recipient in pubsub request for PEP |
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219 # so we set "to" attribute if it doesn't exist |
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220 if not fwd_iq.hasAttribute('to'): |
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221 fwd_iq["to"] = jid.JID(fwd_iq["from"]).userhost() |
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222 |
|
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223 # we now inject the element in the stream |
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224 self.xmlstream.dispatch(fwd_iq) |
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225 |
|
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226 def getDiscoInfo(self, requestor, target, nodeIdentifier=''): |
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227 """Manage disco nesting |
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228 |
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229 This method looks for DiscoHandler in sibling handlers and use it to |
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230 collect main disco infos. It then filters by delegated namespace and return it. |
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231 An identity is added for PEP if pubsub namespace is requested. |
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232 |
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233 The same features/identities are returned for main and bare nodes |
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234 """ |
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235 if not nodeIdentifier.startswith(DELEGATION_NS): |
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236 return [] |
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237 try: |
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238 _, namespace = nodeIdentifier.split(DELEGATION_MAIN_SEP, 1) |
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239 except ValueError: |
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240 try: |
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241 _, namespace = nodeIdentifier.split(DELEGATION_BARE_SEP, 1) |
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242 except ValueError: |
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243 log.msg("Unexpected disco node: {}".format(nodeIdentifier)) |
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244 raise error.StanzaError('not-acceptable') |
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245 |
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246 if not namespace: |
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247 log.msg("No namespace found in node {}".format(nodeIdentifier)) |
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248 return [] |
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249 |
|
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250 if namespace.startswith(pubsub.NS_PUBSUB): |
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251 # pubsub use several namespaces starting with NS_PUBSUB (e.g. http://jabber.org/protocol/pubsub#owner) |
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252 # we return the same disco for all of them |
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253 namespace = pubsub.NS_PUBSUB |
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254 |
|
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255 def gotInfos(infos): |
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256 ns_features = [] |
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257 for info in infos: |
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258 if isinstance(info, disco.DiscoFeature) and info.startswith(namespace): |
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259 ns_features.append(info) |
|
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260 elif (isinstance(info, data_form.Form) and info.formNamespace |
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261 and info.formNamespace.startwith(namespace)): |
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262 # extensions management (XEP-0128) |
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263 ns_features.append(info) |
|
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264 |
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265 if namespace == pubsub.NS_PUBSUB: |
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266 ns_features.append(disco.DiscoIdentity('pubsub', 'pep')) |
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267 |
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268 return ns_features |
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269 |
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270 for handler in self.parent.handlers: |
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271 if isinstance(handler, disco.DiscoHandler): |
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272 break |
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273 |
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274 if not isinstance(handler, disco.DiscoHandler): |
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275 log.err("Can't find DiscoHandler") |
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276 return [] |
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277 |
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278 d = handler.info(requestor, target, '') |
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279 d.addCallback(gotInfos) |
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280 return d |
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281 |
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282 def getDiscoItems(self, requestor, target, nodeIdentifier=''): |
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283 return [] |
| 346 | 284 |
| 285 | |
| 286 # we monkeypatch DiscoHandler to add delegation informations | |
| 287 def _onDiscoItems(self, iq): | |
| 288 request = disco._DiscoRequest.fromElement(iq) | |
| 289 # it's really ugly to attach pep data to recipient | |
| 290 # but we don't have many options | |
| 291 request.recipient.pep = iq.delegated | |
| 292 | |
| 293 def toResponse(items): | |
| 294 response = disco.DiscoItems() | |
| 295 response.nodeIdentifier = request.nodeIdentifier | |
| 296 | |
| 297 for item in items: | |
| 298 response.append(item) | |
| 299 | |
| 300 return response.toElement() | |
| 301 | |
| 302 d = self.items(request.sender, request.recipient, | |
| 303 request.nodeIdentifier) | |
| 304 d.addCallback(toResponse) | |
| 305 return d | |
| 306 | |
| 307 | |
| 308 disco.DiscoHandler._onDiscoItems = _onDiscoItems |