Mercurial > libervia-backend
annotate sat/memory/encryption.py @ 3678:ba4ef64a6938
doc: components documentation:
rel 362
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sun, 26 Sep 2021 16:38:00 +0200 |
| parents | be6d91572633 |
| children | 8289ac1b34f4 |
| rev | line source |
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| 3028 | 1 #!/usr/bin/env python3 |
| 3137 | 2 |
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3 |
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4 # SAT: a jabber client |
| 3479 | 5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) |
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6 |
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7 # This program is free software: you can redistribute it and/or modify |
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8 # it under the terms of the GNU Affero General Public License as published by |
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9 # the Free Software Foundation, either version 3 of the License, or |
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10 # (at your option) any later version. |
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11 |
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12 # This program is distributed in the hope that it will be useful, |
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 # GNU Affero General Public License for more details. |
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16 |
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17 # You should have received a copy of the GNU Affero General Public License |
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 |
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20 import copy |
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21 from functools import partial |
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22 from collections import namedtuple |
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23 from twisted.words.protocols.jabber import jid |
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24 from twisted.internet import defer |
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25 from twisted.python import failure |
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26 from sat.core.i18n import D_, _ |
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27 from sat.core.constants import Const as C |
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28 from sat.core import exceptions |
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29 from sat.core.log import getLogger |
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30 from sat.tools.common import data_format |
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31 from sat.tools import utils |
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32 from sat.memory import persistent |
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33 |
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34 |
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35 log = getLogger(__name__) |
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36 |
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37 EncryptionPlugin = namedtuple("EncryptionPlugin", ("instance", |
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38 "name", |
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39 "namespace", |
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40 "priority", |
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41 "directed")) |
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42 |
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43 |
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44 class EncryptionHandler: |
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45 """Class to handle encryption sessions for a client""" |
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46 plugins = [] # plugin able to encrypt messages |
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47 |
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48 def __init__(self, client): |
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49 self.client = client |
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50 self._sessions = {} # bare_jid ==> encryption_data |
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51 self._stored_session = persistent.PersistentDict( |
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52 "core:encryption", profile=client.profile) |
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53 |
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54 @property |
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55 def host(self): |
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56 return self.client.host_app |
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57 |
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58 async def loadSessions(self): |
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59 """Load persistent sessions""" |
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60 await self._stored_session.load() |
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61 start_d_list = [] |
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62 for entity_jid_s, namespace in self._stored_session.items(): |
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63 entity = jid.JID(entity_jid_s) |
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64 start_d_list.append(defer.ensureDeferred(self.start(entity, namespace))) |
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65 |
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66 if start_d_list: |
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67 result = await defer.DeferredList(start_d_list) |
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68 for idx, (success, err) in enumerate(result): |
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69 if not success: |
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70 entity_jid_s, namespace = list(self._stored_session.items())[idx] |
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71 log.warning(_( |
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72 "Could not restart {namespace!r} encryption with {entity}: {err}" |
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73 ).format(namespace=namespace, entity=entity_jid_s, err=err)) |
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74 log.info(_("encryption sessions restored")) |
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75 |
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76 @classmethod |
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77 def registerPlugin(cls, plg_instance, name, namespace, priority=0, directed=False): |
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78 """Register a plugin handling an encryption algorithm |
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79 |
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80 @param plg_instance(object): instance of the plugin |
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81 it must have the following methods: |
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82 - getTrustUI(entity): return a XMLUI for trust management |
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83 entity(jid.JID): entity to manage |
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84 The returned XMLUI must be a form |
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85 if may have the following methods: |
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86 - startEncryption(entity): start encrypted session |
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87 entity(jid.JID): entity to start encrypted session with |
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88 - stopEncryption(entity): start encrypted session |
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89 entity(jid.JID): entity to stop encrypted session with |
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90 if they don't exists, those 2 methods will be ignored. |
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91 |
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92 @param name(unicode): human readable name of the encryption algorithm |
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93 @param namespace(unicode): namespace of the encryption algorithm |
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94 @param priority(int): priority of this plugin to encrypt an message when not |
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95 selected manually |
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96 @param directed(bool): True if this plugin is directed (if it works with one |
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97 device only at a time) |
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98 """ |
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99 existing_ns = set() |
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100 existing_names = set() |
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101 for p in cls.plugins: |
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102 existing_ns.add(p.namespace.lower()) |
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103 existing_names.add(p.name.lower()) |
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104 if namespace.lower() in existing_ns: |
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105 raise exceptions.ConflictError("A plugin with this namespace already exists!") |
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106 if name.lower() in existing_names: |
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107 raise exceptions.ConflictError("A plugin with this name already exists!") |
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108 plugin = EncryptionPlugin( |
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109 instance=plg_instance, |
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110 name=name, |
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111 namespace=namespace, |
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112 priority=priority, |
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113 directed=directed) |
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114 cls.plugins.append(plugin) |
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115 cls.plugins.sort(key=lambda p: p.priority) |
| 3028 | 116 log.info(_("Encryption plugin registered: {name}").format(name=name)) |
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117 |
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118 @classmethod |
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119 def getPlugins(cls): |
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120 return cls.plugins |
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121 |
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122 @classmethod |
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123 def getPlugin(cls, namespace): |
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124 try: |
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125 return next(p for p in cls.plugins if p.namespace == namespace) |
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126 except StopIteration: |
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127 raise exceptions.NotFound(_( |
| 3028 | 128 "Can't find requested encryption plugin: {namespace}").format( |
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129 namespace=namespace)) |
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130 |
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131 @classmethod |
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132 def getNamespaces(cls): |
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133 """Get available plugin namespaces""" |
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134 return {p.namespace for p in cls.getPlugins()} |
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135 |
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136 @classmethod |
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137 def getNSFromName(cls, name): |
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138 """Retrieve plugin namespace from its name |
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139 |
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140 @param name(unicode): name of the plugin (case insensitive) |
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141 @return (unicode): namespace of the plugin |
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142 @raise exceptions.NotFound: there is not encryption plugin of this name |
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143 """ |
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144 for p in cls.plugins: |
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145 if p.name.lower() == name.lower(): |
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146 return p.namespace |
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147 raise exceptions.NotFound(_( |
| 3028 | 148 "Can't find a plugin with the name \"{name}\".".format( |
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149 name=name))) |
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150 |
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151 def getBridgeData(self, session): |
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152 """Retrieve session data serialized for bridge. |
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153 |
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154 @param session(dict): encryption session |
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155 @return (unicode): serialized data for bridge |
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156 """ |
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157 if session is None: |
| 3028 | 158 return '' |
| 159 plugin = session['plugin'] | |
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160 bridge_data = {'name': plugin.name, |
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161 'namespace': plugin.namespace} |
| 3028 | 162 if 'directed_devices' in session: |
| 163 bridge_data['directed_devices'] = session['directed_devices'] | |
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164 |
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165 return data_format.serialise(bridge_data) |
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166 |
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167 async def _startEncryption(self, plugin, entity): |
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168 """Start encryption with a plugin |
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169 |
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170 This method must be called just before adding a plugin session. |
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171 StartEncryptionn method of plugin will be called if it exists. |
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172 """ |
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173 if not plugin.directed: |
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174 await self._stored_session.aset(entity.userhost(), plugin.namespace) |
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175 try: |
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176 start_encryption = plugin.instance.startEncryption |
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177 except AttributeError: |
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178 log.debug(f"No startEncryption method found for {plugin.namespace}") |
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179 else: |
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180 # we copy entity to avoid having the resource changed by stop_encryption |
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181 await utils.asDeferred(start_encryption, self.client, copy.copy(entity)) |
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182 |
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183 async def _stopEncryption(self, plugin, entity): |
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184 """Stop encryption with a plugin |
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185 |
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186 This method must be called just before removing a plugin session. |
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187 StopEncryptionn method of plugin will be called if it exists. |
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188 """ |
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189 try: |
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190 await self._stored_session.adel(entity.userhost()) |
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191 except KeyError: |
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192 pass |
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193 try: |
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194 stop_encryption = plugin.instance.stopEncryption |
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195 except AttributeError: |
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196 log.debug(f"No stopEncryption method found for {plugin.namespace}") |
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197 else: |
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198 # we copy entity to avoid having the resource changed by stop_encryption |
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199 return utils.asDeferred(stop_encryption, self.client, copy.copy(entity)) |
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200 |
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201 async def start(self, entity, namespace=None, replace=False): |
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202 """Start an encryption session with an entity |
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203 |
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204 @param entity(jid.JID): entity to start an encryption session with |
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205 must be bare jid is the algorithm encrypt for all devices |
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206 @param namespace(unicode, None): namespace of the encryption algorithm |
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207 to use. |
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208 None to select automatically an algorithm |
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209 @param replace(bool): if True and an encrypted session already exists, |
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210 it will be replaced by the new one |
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211 """ |
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212 if not self.plugins: |
| 3028 | 213 raise exceptions.NotFound(_("No encryption plugin is registered, " |
| 214 "an encryption session can't be started")) | |
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215 |
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216 if namespace is None: |
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217 plugin = self.plugins[0] |
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218 else: |
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219 plugin = self.getPlugin(namespace) |
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220 |
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221 bare_jid = entity.userhostJID() |
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222 if bare_jid in self._sessions: |
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223 # we have already an encryption session with this contact |
| 3028 | 224 former_plugin = self._sessions[bare_jid]["plugin"] |
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225 if former_plugin.namespace == namespace: |
| 3028 | 226 log.info(_("Session with {bare_jid} is already encrypted with {name}. " |
| 227 "Nothing to do.").format( | |
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228 bare_jid=bare_jid, name=former_plugin.name)) |
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229 return |
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230 |
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231 if replace: |
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232 # there is a conflict, but replacement is requested |
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233 # so we stop previous encryption to use new one |
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234 del self._sessions[bare_jid] |
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235 await self._stopEncryption(former_plugin, entity) |
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236 else: |
| 3028 | 237 msg = (_("Session with {bare_jid} is already encrypted with {name}. " |
| 238 "Please stop encryption session before changing algorithm.") | |
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239 .format(bare_jid=bare_jid, name=plugin.name)) |
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240 log.warning(msg) |
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241 raise exceptions.ConflictError(msg) |
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242 |
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243 data = {"plugin": plugin} |
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244 if plugin.directed: |
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245 if not entity.resource: |
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246 entity.resource = self.host.memory.getMainResource(self.client, entity) |
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247 if not entity.resource: |
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248 raise exceptions.NotFound( |
| 3028 | 249 _("No resource found for {destinee}, can't encrypt with {name}") |
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250 .format(destinee=entity.full(), name=plugin.name)) |
| 3028 | 251 log.info(_("No resource specified to encrypt with {name}, using " |
| 252 "{destinee}.").format(destinee=entity.full(), | |
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253 name=plugin.name)) |
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254 # indicate that we encrypt only for some devices |
| 3028 | 255 directed_devices = data['directed_devices'] = [entity.resource] |
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256 elif entity.resource: |
| 3028 | 257 raise ValueError(_("{name} encryption must be used with bare jids.")) |
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258 |
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259 await self._startEncryption(plugin, entity) |
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260 self._sessions[entity.userhostJID()] = data |
| 3028 | 261 log.info(_("Encryption session has been set for {entity_jid} with " |
| 262 "{encryption_name}").format( | |
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263 entity_jid=entity.full(), encryption_name=plugin.name)) |
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264 self.host.bridge.messageEncryptionStarted( |
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265 entity.full(), |
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266 self.getBridgeData(data), |
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267 self.client.profile) |
| 3028 | 268 msg = D_("Encryption session started: your messages with {destinee} are " |
| 269 "now end to end encrypted using {name} algorithm.").format( | |
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270 destinee=entity.full(), name=plugin.name) |
| 3028 | 271 directed_devices = data.get('directed_devices') |
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272 if directed_devices: |
| 3028 | 273 msg += "\n" + D_("Message are encrypted only for {nb_devices} device(s): " |
| 274 "{devices_list}.").format( | |
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275 nb_devices=len(directed_devices), |
| 3028 | 276 devices_list = ', '.join(directed_devices)) |
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277 |
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278 self.client.feedback(bare_jid, msg) |
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279 |
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280 async def stop(self, entity, namespace=None): |
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281 """Stop an encryption session with an entity |
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282 |
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283 @param entity(jid.JID): entity with who the encryption session must be stopped |
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284 must be bare jid if the algorithm encrypt for all devices |
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285 @param namespace(unicode): namespace of the session to stop |
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286 when specified, used to check that we stop the right encryption session |
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287 """ |
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288 session = self.getSession(entity.userhostJID()) |
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289 if not session: |
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290 raise failure.Failure( |
| 3028 | 291 exceptions.NotFound(_("There is no encryption session with this " |
| 292 "entity."))) | |
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293 plugin = session['plugin'] |
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294 if namespace is not None and plugin.namespace != namespace: |
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295 raise exceptions.InternalError(_( |
| 3028 | 296 "The encryption session is not run with the expected plugin: encrypted " |
| 297 "with {current_name} and was expecting {expected_name}").format( | |
| 298 current_name=session['plugin'].namespace, | |
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299 expected_name=namespace)) |
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300 if entity.resource: |
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301 try: |
| 3028 | 302 directed_devices = session['directed_devices'] |
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303 except KeyError: |
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304 raise exceptions.NotFound(_( |
| 3028 | 305 "There is a session for the whole entity (i.e. all devices of the " |
| 306 "entity), not a directed one. Please use bare jid if you want to " | |
| 307 "stop the whole encryption with this entity.")) | |
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308 |
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309 try: |
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310 directed_devices.remove(entity.resource) |
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311 except ValueError: |
| 3028 | 312 raise exceptions.NotFound(_("There is no directed session with this " |
| 313 "entity.")) | |
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314 else: |
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315 if not directed_devices: |
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316 # if we have no more directed device sessions, |
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317 # we stop the whole session |
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318 # see comment below for deleting session before stopping encryption |
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319 del self._sessions[entity.userhostJID()] |
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320 await self._stopEncryption(plugin, entity) |
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321 else: |
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322 # plugin's stopEncryption may call stop again (that's the case with OTR) |
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323 # so we need to remove plugin from session before calling self._stopEncryption |
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324 del self._sessions[entity.userhostJID()] |
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325 await self._stopEncryption(plugin, entity) |
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326 |
| 3028 | 327 log.info(_("encryption session stopped with entity {entity}").format( |
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328 entity=entity.full())) |
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329 self.host.bridge.messageEncryptionStopped( |
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330 entity.full(), |
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331 {'name': plugin.name, |
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332 'namespace': plugin.namespace, |
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333 }, |
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334 self.client.profile) |
| 3028 | 335 msg = D_("Encryption session finished: your messages with {destinee} are " |
| 336 "NOT end to end encrypted anymore.\nYour server administrators or " | |
| 337 "{destinee} server administrators will be able to read them.").format( | |
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338 destinee=entity.full()) |
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339 |
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340 self.client.feedback(entity, msg) |
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341 |
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342 def getSession(self, entity): |
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343 """Get encryption session for this contact |
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344 |
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345 @param entity(jid.JID): get the session for this entity |
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346 must be a bare jid |
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347 @return (dict, None): encryption session data |
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348 None if there is not encryption for this session with this jid |
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349 """ |
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350 if entity.resource: |
| 3028 | 351 raise ValueError("Full jid given when expecting bare jid") |
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352 return self._sessions.get(entity) |
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353 |
|
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354 def getTrustUI(self, entity_jid, namespace=None): |
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355 """Retrieve encryption UI |
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356 |
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357 @param entity_jid(jid.JID): get the UI for this entity |
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358 must be a bare jid |
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359 @param namespace(unicode): namespace of the algorithm to manage |
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360 if None use current algorithm |
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361 @return D(xmlui): XMLUI for trust management |
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362 the xmlui is a form |
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363 None if there is not encryption for this session with this jid |
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364 @raise exceptions.NotFound: no algorithm/plugin found |
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365 @raise NotImplementedError: plugin doesn't handle UI management |
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366 """ |
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367 if namespace is None: |
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368 session = self.getSession(entity_jid) |
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369 if not session: |
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370 raise exceptions.NotFound( |
| 3028 | 371 "No encryption session currently active for {entity_jid}" |
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372 .format(entity_jid=entity_jid.full())) |
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373 plugin = session['plugin'] |
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374 else: |
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375 plugin = self.getPlugin(namespace) |
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376 try: |
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377 get_trust_ui = plugin.instance.getTrustUI |
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378 except AttributeError: |
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379 raise NotImplementedError( |
| 3028 | 380 "Encryption plugin doesn't handle trust management UI") |
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381 else: |
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382 return utils.asDeferred(get_trust_ui, self.client, entity_jid) |
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383 |
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384 ## Menus ## |
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385 |
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386 @classmethod |
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387 def _importMenus(cls, host): |
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388 host.importMenu( |
| 3028 | 389 (D_("Encryption"), D_("unencrypted (plain text)")), |
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390 partial(cls._onMenuUnencrypted, host=host), |
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391 security_limit=0, |
| 3028 | 392 help_string=D_("End encrypted session"), |
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393 type_=C.MENU_SINGLE, |
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394 ) |
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395 for plg in cls.getPlugins(): |
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396 host.importMenu( |
| 3028 | 397 (D_("Encryption"), plg.name), |
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398 partial(cls._onMenuName, host=host, plg=plg), |
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399 security_limit=0, |
| 3028 | 400 help_string=D_("Start {name} session").format(name=plg.name), |
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401 type_=C.MENU_SINGLE, |
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402 ) |
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403 host.importMenu( |
| 3028 | 404 (D_("Encryption"), D_("⛨ {name} trust").format(name=plg.name)), |
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405 partial(cls._onMenuTrust, host=host, plg=plg), |
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406 security_limit=0, |
| 3028 | 407 help_string=D_("Manage {name} trust").format(name=plg.name), |
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408 type_=C.MENU_SINGLE, |
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409 ) |
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410 |
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411 @classmethod |
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412 def _onMenuUnencrypted(cls, data, host, profile): |
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413 client = host.getClient(profile) |
| 3028 | 414 peer_jid = jid.JID(data['jid']).userhostJID() |
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415 d = defer.ensureDeferred(client.encryption.stop(peer_jid)) |
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416 d.addCallback(lambda __: {}) |
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417 return d |
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418 |
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419 @classmethod |
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420 def _onMenuName(cls, data, host, plg, profile): |
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421 client = host.getClient(profile) |
| 3028 | 422 peer_jid = jid.JID(data['jid']) |
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423 if not plg.directed: |
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424 peer_jid = peer_jid.userhostJID() |
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425 d = defer.ensureDeferred( |
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426 client.encryption.start(peer_jid, plg.namespace, replace=True)) |
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427 d.addCallback(lambda __: {}) |
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428 return d |
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429 |
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430 @classmethod |
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431 @defer.inlineCallbacks |
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432 def _onMenuTrust(cls, data, host, plg, profile): |
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433 client = host.getClient(profile) |
| 3028 | 434 peer_jid = jid.JID(data['jid']).userhostJID() |
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435 ui = yield client.encryption.getTrustUI(peer_jid, plg.namespace) |
| 3028 | 436 defer.returnValue({'xmlui': ui.toXml()}) |
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437 |
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438 ## Triggers ## |
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439 |
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440 def setEncryptionFlag(self, mess_data): |
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441 """Set "encryption" key in mess_data if session with destinee is encrypted""" |
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442 to_jid = mess_data['to'] |
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443 encryption = self._sessions.get(to_jid.userhostJID()) |
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444 if encryption is not None: |
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445 plugin = encryption['plugin'] |
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446 if mess_data["type"] == "groupchat" and plugin.directed: |
|
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447 raise exceptions.InternalError( |
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448 f"encryption flag must not be set for groupchat if encryption algorithm " |
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449 f"({encryption['plugin'].name}) is directed!") |
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450 mess_data[C.MESS_KEY_ENCRYPTION] = encryption |
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451 self.markAsEncrypted(mess_data, plugin.namespace) |
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452 |
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453 ## Misc ## |
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454 |
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455 def markAsEncrypted(self, mess_data, namespace): |
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456 """Helper method to mark a message as having been e2e encrypted. |
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457 |
|
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458 This should be used in the post_treat workflow of messageReceived trigger of |
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459 the plugin |
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460 @param mess_data(dict): message data as used in post treat workflow |
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461 @param namespace(str): namespace of the algorithm used for encrypting the message |
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462 """ |
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463 mess_data['extra'][C.MESS_KEY_ENCRYPTED] = True |
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464 from_bare_jid = mess_data['from'].userhostJID() |
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465 if from_bare_jid != self.client.jid.userhostJID(): |
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466 session = self.getSession(from_bare_jid) |
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467 if session is None: |
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468 # if we are currently unencrypted, we start a session automatically |
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469 # to avoid sending unencrypted messages in an encrypted context |
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470 log.info(_( |
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471 "Starting e2e session with {peer_jid} as we receive encrypted " |
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472 "messages") |
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473 .format(peer_jid=from_bare_jid) |
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474 ) |
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475 defer.ensureDeferred(self.start(from_bare_jid, namespace)) |
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476 |
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477 return mess_data |
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478 |
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479 def isEncryptionRequested(self, mess_data, namespace=None): |
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480 """Helper method to check if encryption is requested in an outgoind message |
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481 |
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482 @param mess_data(dict): message data for outgoing message |
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483 @param namespace(str, None): if set, check if encryption is requested for the |
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484 algorithm specified |
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485 @return (bool): True if the encryption flag is present |
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486 """ |
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487 encryption = mess_data.get(C.MESS_KEY_ENCRYPTION) |
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488 if encryption is None: |
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489 return False |
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490 # we get plugin even if namespace is None to be sure that the key exists |
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491 plugin = encryption['plugin'] |
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492 if namespace is None: |
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493 return True |
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494 return plugin.namespace == namespace |
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495 |
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496 def isEncrypted(self, mess_data): |
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497 """Helper method to check if a message has the e2e encrypted flag |
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498 |
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499 @param mess_data(dict): message data |
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500 @return (bool): True if the encrypted flag is present |
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501 """ |
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502 return mess_data['extra'].get(C.MESS_KEY_ENCRYPTED, False) |
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503 |
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504 |
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505 def markAsTrusted(self, mess_data): |
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506 """Helper methor to mark a message as sent from a trusted entity. |
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507 |
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508 This should be used in the post_treat workflow of messageReceived trigger of |
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509 the plugin |
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510 @param mess_data(dict): message data as used in post treat workflow |
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511 """ |
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512 mess_data[C.MESS_KEY_TRUSTED] = True |
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513 return mess_data |
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514 |
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515 def markAsUntrusted(self, mess_data): |
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516 """Helper methor to mark a message as sent from an untrusted entity. |
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517 |
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518 This should be used in the post_treat workflow of messageReceived trigger of |
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519 the plugin |
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520 @param mess_data(dict): message data as used in post treat workflow |
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521 """ |
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522 mess_data['trusted'] = False |
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523 return mess_data |