Mercurial > libervia-backend
annotate libervia/backend/memory/encryption.py @ 4201:6a8cc6d668a4
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| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Thu, 14 Dec 2023 09:19:32 +0100 |
| parents | 4b842c1fb686 |
| children | 0d7bb4df2343 |
| rev | line source |
|---|---|
| 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 typing import Optional |
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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 libervia.backend.core.core_types import EncryptionPlugin, EncryptionSession, MessageData |
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27 from libervia.backend.core.i18n import D_, _ |
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28 from libervia.backend.core.constants import Const as C |
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29 from libervia.backend.core import exceptions |
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30 from libervia.backend.core.log import getLogger |
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31 from libervia.backend.tools.common import data_format |
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32 from libervia.backend.tools import utils |
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33 from libervia.backend.memory import persistent |
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34 |
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35 |
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36 log = getLogger(__name__) |
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37 |
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38 |
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39 class EncryptionHandler: |
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40 """Class to handle encryption sessions for a client""" |
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41 plugins = [] # plugin able to encrypt messages |
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42 |
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43 def __init__(self, client): |
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44 self.client = client |
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45 self._sessions = {} # bare_jid ==> encryption_data |
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46 self._stored_session = persistent.PersistentDict( |
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47 "core:encryption", profile=client.profile) |
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48 |
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49 @property |
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50 def host(self): |
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51 return self.client.host_app |
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52 |
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53 async def load_sessions(self): |
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54 """Load persistent sessions""" |
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55 await self._stored_session.load() |
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56 start_d_list = [] |
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57 for entity_jid_s, namespace in self._stored_session.items(): |
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58 entity = jid.JID(entity_jid_s) |
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59 start_d_list.append(defer.ensureDeferred(self.start(entity, namespace))) |
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60 |
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61 if start_d_list: |
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62 result = await defer.DeferredList(start_d_list) |
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63 for idx, (success, err) in enumerate(result): |
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64 if not success: |
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65 entity_jid_s, namespace = list(self._stored_session.items())[idx] |
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66 log.warning(_( |
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67 "Could not restart {namespace!r} encryption with {entity}: {err}" |
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68 ).format(namespace=namespace, entity=entity_jid_s, err=err)) |
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69 log.info(_("encryption sessions restored")) |
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70 |
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71 @classmethod |
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72 def register_plugin(cls, plg_instance, name, namespace, priority=0, directed=False): |
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73 """Register a plugin handling an encryption algorithm |
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74 |
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75 @param plg_instance(object): instance of the plugin |
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76 it must have the following methods: |
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77 - get_trust_ui(entity): return a XMLUI for trust management |
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78 entity(jid.JID): entity to manage |
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79 The returned XMLUI must be a form |
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80 if may have the following methods: |
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81 - start_encryption(entity): start encrypted session |
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82 entity(jid.JID): entity to start encrypted session with |
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83 - stop_encryption(entity): start encrypted session |
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84 entity(jid.JID): entity to stop encrypted session with |
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85 if they don't exists, those 2 methods will be ignored. |
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86 |
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87 @param name(unicode): human readable name of the encryption algorithm |
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88 @param namespace(unicode): namespace of the encryption algorithm |
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89 @param priority(int): priority of this plugin to encrypt an message when not |
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90 selected manually |
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91 @param directed(bool): True if this plugin is directed (if it works with one |
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92 device only at a time) |
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93 """ |
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94 existing_ns = set() |
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95 existing_names = set() |
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96 for p in cls.plugins: |
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97 existing_ns.add(p.namespace.lower()) |
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98 existing_names.add(p.name.lower()) |
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99 if namespace.lower() in existing_ns: |
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100 raise exceptions.ConflictError("A plugin with this namespace already exists!") |
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101 if name.lower() in existing_names: |
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102 raise exceptions.ConflictError("A plugin with this name already exists!") |
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103 plugin = EncryptionPlugin( |
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104 instance=plg_instance, |
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105 name=name, |
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106 namespace=namespace, |
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107 priority=priority, |
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108 directed=directed) |
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109 cls.plugins.append(plugin) |
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110 cls.plugins.sort(key=lambda p: p.priority) |
| 3028 | 111 log.info(_("Encryption plugin registered: {name}").format(name=name)) |
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112 |
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113 @classmethod |
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114 def getPlugins(cls): |
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115 return cls.plugins |
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116 |
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117 @classmethod |
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118 def get_plugin(cls, namespace): |
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119 try: |
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120 return next(p for p in cls.plugins if p.namespace == namespace) |
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121 except StopIteration: |
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122 raise exceptions.NotFound(_( |
| 3028 | 123 "Can't find requested encryption plugin: {namespace}").format( |
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124 namespace=namespace)) |
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125 |
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126 @classmethod |
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127 def get_namespaces(cls): |
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128 """Get available plugin namespaces""" |
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129 return {p.namespace for p in cls.getPlugins()} |
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130 |
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131 @classmethod |
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132 def get_ns_from_name(cls, name): |
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133 """Retrieve plugin namespace from its name |
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134 |
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135 @param name(unicode): name of the plugin (case insensitive) |
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136 @return (unicode): namespace of the plugin |
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137 @raise exceptions.NotFound: there is not encryption plugin of this name |
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138 """ |
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139 for p in cls.plugins: |
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140 if p.name.lower() == name.lower(): |
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141 return p.namespace |
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142 raise exceptions.NotFound(_( |
| 3028 | 143 "Can't find a plugin with the name \"{name}\".".format( |
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144 name=name))) |
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145 |
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146 def get_bridge_data(self, session): |
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147 """Retrieve session data serialized for bridge. |
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148 |
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149 @param session(dict): encryption session |
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150 @return (unicode): serialized data for bridge |
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151 """ |
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152 if session is None: |
| 3028 | 153 return '' |
| 154 plugin = session['plugin'] | |
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155 bridge_data = {'name': plugin.name, |
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156 'namespace': plugin.namespace} |
| 3028 | 157 if 'directed_devices' in session: |
| 158 bridge_data['directed_devices'] = session['directed_devices'] | |
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159 |
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160 return data_format.serialise(bridge_data) |
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161 |
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162 async def _start_encryption(self, plugin, entity): |
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163 """Start encryption with a plugin |
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164 |
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165 This method must be called just before adding a plugin session. |
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166 StartEncryptionn method of plugin will be called if it exists. |
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167 """ |
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168 if not plugin.directed: |
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169 await self._stored_session.aset(entity.userhost(), plugin.namespace) |
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170 try: |
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171 start_encryption = plugin.instance.start_encryption |
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172 except AttributeError: |
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173 log.debug(f"No start_encryption method found for {plugin.namespace}") |
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174 else: |
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175 # we copy entity to avoid having the resource changed by stop_encryption |
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176 await utils.as_deferred(start_encryption, self.client, copy.copy(entity)) |
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177 |
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178 async def _stop_encryption(self, plugin, entity): |
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179 """Stop encryption with a plugin |
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180 |
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181 This method must be called just before removing a plugin session. |
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182 StopEncryptionn method of plugin will be called if it exists. |
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183 """ |
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184 try: |
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185 await self._stored_session.adel(entity.userhost()) |
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186 except KeyError: |
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187 pass |
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188 try: |
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189 stop_encryption = plugin.instance.stop_encryption |
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190 except AttributeError: |
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191 log.debug(f"No stop_encryption method found for {plugin.namespace}") |
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192 else: |
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193 # we copy entity to avoid having the resource changed by stop_encryption |
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194 return utils.as_deferred(stop_encryption, self.client, copy.copy(entity)) |
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195 |
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196 async def start(self, entity, namespace=None, replace=False): |
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197 """Start an encryption session with an entity |
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198 |
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199 @param entity(jid.JID): entity to start an encryption session with |
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200 must be bare jid is the algorithm encrypt for all devices |
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201 @param namespace(unicode, None): namespace of the encryption algorithm |
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202 to use. |
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203 None to select automatically an algorithm |
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204 @param replace(bool): if True and an encrypted session already exists, |
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205 it will be replaced by the new one |
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206 """ |
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207 if not self.plugins: |
| 3028 | 208 raise exceptions.NotFound(_("No encryption plugin is registered, " |
| 209 "an encryption session can't be started")) | |
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210 |
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211 if namespace is None: |
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212 plugin = self.plugins[0] |
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213 else: |
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214 plugin = self.get_plugin(namespace) |
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215 |
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216 bare_jid = entity.userhostJID() |
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217 if bare_jid in self._sessions: |
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218 # we have already an encryption session with this contact |
| 3028 | 219 former_plugin = self._sessions[bare_jid]["plugin"] |
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220 if former_plugin.namespace == namespace: |
| 3028 | 221 log.info(_("Session with {bare_jid} is already encrypted with {name}. " |
| 222 "Nothing to do.").format( | |
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223 bare_jid=bare_jid, name=former_plugin.name)) |
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224 return |
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225 |
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226 if replace: |
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227 # there is a conflict, but replacement is requested |
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228 # so we stop previous encryption to use new one |
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229 del self._sessions[bare_jid] |
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230 await self._stop_encryption(former_plugin, entity) |
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231 else: |
| 3028 | 232 msg = (_("Session with {bare_jid} is already encrypted with {name}. " |
| 233 "Please stop encryption session before changing algorithm.") | |
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234 .format(bare_jid=bare_jid, name=plugin.name)) |
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235 log.warning(msg) |
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236 raise exceptions.ConflictError(msg) |
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237 |
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238 data = {"plugin": plugin} |
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239 if plugin.directed: |
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240 if not entity.resource: |
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241 entity.resource = self.host.memory.main_resource_get(self.client, entity) |
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242 if not entity.resource: |
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243 raise exceptions.NotFound( |
| 3028 | 244 _("No resource found for {destinee}, can't encrypt with {name}") |
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245 .format(destinee=entity.full(), name=plugin.name)) |
| 3028 | 246 log.info(_("No resource specified to encrypt with {name}, using " |
| 247 "{destinee}.").format(destinee=entity.full(), | |
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248 name=plugin.name)) |
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249 # indicate that we encrypt only for some devices |
| 3028 | 250 directed_devices = data['directed_devices'] = [entity.resource] |
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251 elif entity.resource: |
| 3028 | 252 raise ValueError(_("{name} encryption must be used with bare jids.")) |
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253 |
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254 await self._start_encryption(plugin, entity) |
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255 self._sessions[entity.userhostJID()] = data |
| 3028 | 256 log.info(_("Encryption session has been set for {entity_jid} with " |
| 257 "{encryption_name}").format( | |
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258 entity_jid=entity.full(), encryption_name=plugin.name)) |
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259 self.host.bridge.message_encryption_started( |
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260 entity.full(), |
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261 self.get_bridge_data(data), |
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262 self.client.profile) |
| 3028 | 263 msg = D_("Encryption session started: your messages with {destinee} are " |
| 264 "now end to end encrypted using {name} algorithm.").format( | |
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265 destinee=entity.full(), name=plugin.name) |
| 3028 | 266 directed_devices = data.get('directed_devices') |
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267 if directed_devices: |
| 3028 | 268 msg += "\n" + D_("Message are encrypted only for {nb_devices} device(s): " |
| 269 "{devices_list}.").format( | |
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270 nb_devices=len(directed_devices), |
| 3028 | 271 devices_list = ', '.join(directed_devices)) |
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272 |
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273 self.client.feedback(bare_jid, msg) |
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274 |
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275 async def stop(self, entity, namespace=None): |
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276 """Stop an encryption session with an entity |
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277 |
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278 @param entity(jid.JID): entity with who the encryption session must be stopped |
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279 must be bare jid if the algorithm encrypt for all devices |
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280 @param namespace(unicode): namespace of the session to stop |
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281 when specified, used to check that we stop the right encryption session |
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282 """ |
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283 session = self.getSession(entity.userhostJID()) |
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284 if not session: |
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285 raise failure.Failure( |
| 3028 | 286 exceptions.NotFound(_("There is no encryption session with this " |
| 287 "entity."))) | |
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288 plugin = session['plugin'] |
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289 if namespace is not None and plugin.namespace != namespace: |
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290 raise exceptions.InternalError(_( |
| 3028 | 291 "The encryption session is not run with the expected plugin: encrypted " |
| 292 "with {current_name} and was expecting {expected_name}").format( | |
| 293 current_name=session['plugin'].namespace, | |
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294 expected_name=namespace)) |
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295 if entity.resource: |
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296 try: |
| 3028 | 297 directed_devices = session['directed_devices'] |
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298 except KeyError: |
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299 raise exceptions.NotFound(_( |
| 3028 | 300 "There is a session for the whole entity (i.e. all devices of the " |
| 301 "entity), not a directed one. Please use bare jid if you want to " | |
| 302 "stop the whole encryption with this entity.")) | |
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303 |
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304 try: |
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305 directed_devices.remove(entity.resource) |
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306 except ValueError: |
| 3028 | 307 raise exceptions.NotFound(_("There is no directed session with this " |
| 308 "entity.")) | |
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309 else: |
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310 if not directed_devices: |
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311 # if we have no more directed device sessions, |
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312 # we stop the whole session |
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313 # see comment below for deleting session before stopping encryption |
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314 del self._sessions[entity.userhostJID()] |
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315 await self._stop_encryption(plugin, entity) |
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316 else: |
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317 # plugin's stop_encryption may call stop again (that's the case with OTR) |
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318 # so we need to remove plugin from session before calling self._stop_encryption |
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319 del self._sessions[entity.userhostJID()] |
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320 await self._stop_encryption(plugin, entity) |
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321 |
| 3028 | 322 log.info(_("encryption session stopped with entity {entity}").format( |
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323 entity=entity.full())) |
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324 self.host.bridge.message_encryption_stopped( |
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325 entity.full(), |
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326 {'name': plugin.name, |
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327 'namespace': plugin.namespace, |
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328 }, |
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329 self.client.profile) |
| 3028 | 330 msg = D_("Encryption session finished: your messages with {destinee} are " |
| 331 "NOT end to end encrypted anymore.\nYour server administrators or " | |
| 332 "{destinee} server administrators will be able to read them.").format( | |
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333 destinee=entity.full()) |
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334 |
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335 self.client.feedback(entity, msg) |
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336 |
|
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337 def getSession(self, entity: jid.JID) -> Optional[EncryptionSession]: |
|
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338 """Get encryption session for this contact |
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339 |
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340 @param entity(jid.JID): get the session for this entity |
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341 must be a bare jid |
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342 @return (dict, None): encryption session data |
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343 None if there is not encryption for this session with this jid |
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344 """ |
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345 if entity.resource: |
| 3028 | 346 raise ValueError("Full jid given when expecting bare jid") |
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347 return self._sessions.get(entity) |
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348 |
|
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349 def get_namespace(self, entity: jid.JID) -> Optional[str]: |
|
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|
350 """Helper method to get the current encryption namespace used |
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351 |
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352 @param entity: get the namespace for this entity must be a bare jid |
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353 @return: the algorithm namespace currently used in this session, or None if no |
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354 e2ee is currently used. |
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355 """ |
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356 session = self.getSession(entity) |
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357 if session is None: |
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358 return None |
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359 return session["plugin"].namespace |
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360 |
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361 def get_trust_ui(self, entity_jid, namespace=None): |
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362 """Retrieve encryption UI |
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363 |
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364 @param entity_jid(jid.JID): get the UI for this entity |
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365 must be a bare jid |
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366 @param namespace(unicode): namespace of the algorithm to manage |
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367 if None use current algorithm |
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368 @return D(xmlui): XMLUI for trust management |
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369 the xmlui is a form |
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370 None if there is not encryption for this session with this jid |
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371 @raise exceptions.NotFound: no algorithm/plugin found |
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372 @raise NotImplementedError: plugin doesn't handle UI management |
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373 """ |
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374 if namespace is None: |
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375 session = self.getSession(entity_jid) |
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376 if not session: |
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377 raise exceptions.NotFound( |
| 3028 | 378 "No encryption session currently active for {entity_jid}" |
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379 .format(entity_jid=entity_jid.full())) |
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380 plugin = session['plugin'] |
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381 else: |
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382 plugin = self.get_plugin(namespace) |
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383 try: |
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384 get_trust_ui = plugin.instance.get_trust_ui |
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385 except AttributeError: |
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386 raise NotImplementedError( |
| 3028 | 387 "Encryption plugin doesn't handle trust management UI") |
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388 else: |
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389 return utils.as_deferred(get_trust_ui, self.client, entity_jid) |
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390 |
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391 ## Menus ## |
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392 |
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393 @classmethod |
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394 def _import_menus(cls, host): |
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395 host.import_menu( |
| 3028 | 396 (D_("Encryption"), D_("unencrypted (plain text)")), |
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397 partial(cls._on_menu_unencrypted, host=host), |
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398 security_limit=0, |
| 3028 | 399 help_string=D_("End encrypted session"), |
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400 type_=C.MENU_SINGLE, |
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401 ) |
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402 for plg in cls.getPlugins(): |
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403 host.import_menu( |
| 3028 | 404 (D_("Encryption"), plg.name), |
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405 partial(cls._on_menu_name, host=host, plg=plg), |
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406 security_limit=0, |
| 3028 | 407 help_string=D_("Start {name} session").format(name=plg.name), |
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408 type_=C.MENU_SINGLE, |
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409 ) |
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410 host.import_menu( |
| 3028 | 411 (D_("Encryption"), D_("⛨ {name} trust").format(name=plg.name)), |
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412 partial(cls._on_menu_trust, host=host, plg=plg), |
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413 security_limit=0, |
| 3028 | 414 help_string=D_("Manage {name} trust").format(name=plg.name), |
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415 type_=C.MENU_SINGLE, |
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416 ) |
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417 |
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418 @classmethod |
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419 def _on_menu_unencrypted(cls, data, host, profile): |
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420 client = host.get_client(profile) |
| 3028 | 421 peer_jid = jid.JID(data['jid']).userhostJID() |
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422 d = defer.ensureDeferred(client.encryption.stop(peer_jid)) |
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423 d.addCallback(lambda __: {}) |
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424 return d |
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425 |
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426 @classmethod |
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427 def _on_menu_name(cls, data, host, plg, profile): |
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428 client = host.get_client(profile) |
| 3028 | 429 peer_jid = jid.JID(data['jid']) |
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430 if not plg.directed: |
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431 peer_jid = peer_jid.userhostJID() |
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432 d = defer.ensureDeferred( |
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433 client.encryption.start(peer_jid, plg.namespace, replace=True)) |
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434 d.addCallback(lambda __: {}) |
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435 return d |
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436 |
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437 @classmethod |
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438 @defer.inlineCallbacks |
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439 def _on_menu_trust(cls, data, host, plg, profile): |
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440 client = host.get_client(profile) |
| 3028 | 441 peer_jid = jid.JID(data['jid']).userhostJID() |
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442 ui = yield client.encryption.get_trust_ui(peer_jid, plg.namespace) |
| 3028 | 443 defer.returnValue({'xmlui': ui.toXml()}) |
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444 |
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445 ## Triggers ## |
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446 |
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447 def set_encryption_flag(self, mess_data): |
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448 """Set "encryption" key in mess_data if session with destinee is encrypted""" |
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449 to_jid = mess_data['to'] |
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450 encryption = self._sessions.get(to_jid.userhostJID()) |
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451 if encryption is not None: |
|
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452 plugin = encryption['plugin'] |
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453 if mess_data["type"] == "groupchat" and plugin.directed: |
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454 raise exceptions.InternalError( |
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455 f"encryption flag must not be set for groupchat if encryption algorithm " |
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456 f"({encryption['plugin'].name}) is directed!") |
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457 mess_data[C.MESS_KEY_ENCRYPTION] = encryption |
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458 self.mark_as_encrypted(mess_data, plugin.namespace) |
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459 |
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460 ## Misc ## |
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461 |
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462 def mark_as_encrypted(self, mess_data, namespace): |
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463 """Helper method to mark a message as having been e2e encrypted. |
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464 |
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465 This should be used in the post_treat workflow of message_received trigger of |
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466 the plugin |
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467 @param mess_data(dict): message data as used in post treat workflow |
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468 @param namespace(str): namespace of the algorithm used for encrypting the message |
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469 """ |
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470 mess_data['extra'][C.MESS_KEY_ENCRYPTED] = True |
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471 from_bare_jid = mess_data['from'].userhostJID() |
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472 if from_bare_jid != self.client.jid.userhostJID(): |
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473 session = self.getSession(from_bare_jid) |
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474 if session is None: |
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475 # if we are currently unencrypted, we start a session automatically |
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476 # to avoid sending unencrypted messages in an encrypted context |
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477 log.info(_( |
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478 "Starting e2e session with {peer_jid} as we receive encrypted " |
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479 "messages") |
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480 .format(peer_jid=from_bare_jid) |
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481 ) |
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482 defer.ensureDeferred(self.start(from_bare_jid, namespace)) |
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483 |
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484 return mess_data |
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485 |
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486 def is_encryption_requested( |
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487 self, |
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488 mess_data: MessageData, |
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489 namespace: Optional[str] = None |
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490 ) -> bool: |
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491 """Helper method to check if encryption is requested in an outgoind message |
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492 |
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493 @param mess_data: message data for outgoing message |
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494 @param namespace: if set, check if encryption is requested for the algorithm |
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495 specified |
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496 @return: True if the encryption flag is present |
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497 """ |
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498 encryption = mess_data.get(C.MESS_KEY_ENCRYPTION) |
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499 if encryption is None: |
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500 return False |
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501 # we get plugin even if namespace is None to be sure that the key exists |
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502 plugin = encryption['plugin'] |
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503 if namespace is None: |
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504 return True |
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505 return plugin.namespace == namespace |
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506 |
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507 def isEncrypted(self, mess_data): |
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508 """Helper method to check if a message has the e2e encrypted flag |
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509 |
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510 @param mess_data(dict): message data |
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511 @return (bool): True if the encrypted flag is present |
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512 """ |
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513 return mess_data['extra'].get(C.MESS_KEY_ENCRYPTED, False) |
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514 |
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515 |
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516 def mark_as_trusted(self, mess_data): |
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517 """Helper methor to mark a message as sent from a trusted entity. |
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518 |
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519 This should be used in the post_treat workflow of message_received trigger of |
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520 the plugin |
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521 @param mess_data(dict): message data as used in post treat workflow |
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522 """ |
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523 mess_data[C.MESS_KEY_TRUSTED] = True |
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524 return mess_data |
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525 |
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526 def mark_as_untrusted(self, mess_data): |
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527 """Helper methor to mark a message as sent from an untrusted entity. |
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528 |
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529 This should be used in the post_treat workflow of message_received trigger of |
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530 the plugin |
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531 @param mess_data(dict): message data as used in post treat workflow |
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532 """ |
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533 mess_data['trusted'] = False |
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534 return mess_data |