Mercurial > libervia-backend
annotate sat/memory/encryption.py @ 2944:efb915a20d5d
jp (blog/set): fixed missing current_syntax
author | Goffi <goffi@goffi.org> |
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date | Sun, 05 May 2019 18:50:35 +0200 |
parents | c161a294fffd |
children | ab2696e34d29 |
rev | line source |
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1 #!/usr/bin/env python2 |
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2 # -*- coding: utf-8 -*- |
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3 |
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4 # SAT: a jabber client |
2771 | 5 # Copyright (C) 2009-2019 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 from functools import partial |
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21 from sat.core.i18n import D_, _ |
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22 from sat.core.constants import Const as C |
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23 from sat.core import exceptions |
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24 from collections import namedtuple |
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25 from sat.core.log import getLogger |
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26 from sat.tools.common import data_format |
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27 from twisted.words.protocols.jabber import jid |
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28 from twisted.internet import defer |
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29 from twisted.python import failure |
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30 import copy |
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31 log = getLogger(__name__) |
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32 |
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33 log = getLogger(__name__) |
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34 |
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35 EncryptionPlugin = namedtuple("EncryptionPlugin", ("instance", |
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36 "name", |
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37 "namespace", |
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38 "priority", |
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39 "directed")) |
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40 |
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41 |
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42 class EncryptionHandler(object): |
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43 """Class to handle encryption sessions for a client""" |
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44 plugins = [] # plugin able to encrypt messages |
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45 |
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46 def __init__(self, client): |
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47 self.client = client |
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48 self._sessions = {} # bare_jid ==> encryption_data |
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49 |
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50 @property |
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51 def host(self): |
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52 return self.client.host_app |
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53 |
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54 @classmethod |
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55 def registerPlugin(cls, plg_instance, name, namespace, priority=0, directed=False): |
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56 """Register a plugin handling an encryption algorithm |
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57 |
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58 @param plg_instance(object): instance of the plugin |
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59 it must have the following methods: |
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60 - getTrustUI(entity): return a XMLUI for trust management |
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61 entity(jid.JID): entity to manage |
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62 The returned XMLUI must be a form |
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63 if may have the following methods: |
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64 - startEncryption(entity): start encrypted session |
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65 entity(jid.JID): entity to start encrypted session with |
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66 - stopEncryption(entity): start encrypted session |
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67 entity(jid.JID): entity to stop encrypted session with |
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68 if they don't exists, those 2 methods will be ignored. |
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69 |
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70 @param name(unicode): human readable name of the encryption algorithm |
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71 @param namespace(unicode): namespace of the encryption algorithm |
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72 @param priority(int): priority of this plugin to encrypt an message when not |
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73 selected manually |
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74 @param directed(bool): True if this plugin is directed (if it works with one |
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75 device only at a time) |
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76 """ |
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77 existing_ns = set() |
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78 existing_names = set() |
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79 for p in cls.plugins: |
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80 existing_ns.add(p.namespace.lower()) |
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81 existing_names.add(p.name.lower()) |
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82 if namespace.lower() in existing_ns: |
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83 raise exceptions.ConflictError("A plugin with this namespace already exists!") |
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84 if name.lower() in existing_names: |
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85 raise exceptions.ConflictError("A plugin with this name already exists!") |
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86 plugin = EncryptionPlugin( |
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87 instance=plg_instance, |
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88 name=name, |
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89 namespace=namespace, |
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90 priority=priority, |
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91 directed=directed) |
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92 cls.plugins.append(plugin) |
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93 cls.plugins.sort(key=lambda p: p.priority) |
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94 log.info(_(u"Encryption plugin registered: {name}").format(name=name)) |
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95 |
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96 @classmethod |
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97 def getPlugins(cls): |
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98 return cls.plugins |
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99 |
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100 @classmethod |
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101 def getPlugin(cls, namespace): |
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102 try: |
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103 return next(p for p in cls.plugins if p.namespace == namespace) |
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104 except StopIteration: |
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105 raise exceptions.NotFound(_( |
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106 u"Can't find requested encryption plugin: {namespace}").format( |
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107 namespace=namespace)) |
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108 |
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109 @classmethod |
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110 def getNamespaces(cls): |
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111 """Get available plugin namespaces""" |
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112 return {p.namespace for p in cls.getPlugins()} |
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113 |
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114 @classmethod |
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115 def getNSFromName(cls, name): |
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116 """Retrieve plugin namespace from its name |
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117 |
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118 @param name(unicode): name of the plugin (case insensitive) |
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119 @return (unicode): namespace of the plugin |
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120 @raise exceptions.NotFound: there is not encryption plugin of this name |
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121 """ |
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122 for p in cls.plugins: |
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123 if p.name.lower() == name.lower(): |
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124 return p.namespace |
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125 raise exceptions.NotFound(_( |
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126 u"Can't find a plugin with the name \"{name}\".".format( |
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127 name=name))) |
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128 |
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129 def getBridgeData(self, session): |
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130 """Retrieve session data serialized for bridge. |
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131 |
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132 @param session(dict): encryption session |
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133 @return (unicode): serialized data for bridge |
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134 """ |
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135 if session is None: |
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136 return u'' |
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137 plugin = session[u'plugin'] |
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138 bridge_data = {'name': plugin.name, |
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139 'namespace': plugin.namespace} |
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140 if u'directed_devices' in session: |
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141 bridge_data[u'directed_devices'] = session[u'directed_devices'] |
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142 |
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143 return data_format.serialise(bridge_data) |
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144 |
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145 def _startEncryption(self, plugin, entity): |
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146 """Start encryption with a plugin |
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147 |
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148 This method must be called just before adding a plugin session. |
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149 StartEncryptionn method of plugin will be called if it exists. |
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150 """ |
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151 try: |
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152 start_encryption = plugin.instance.startEncryption |
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153 except AttributeError: |
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154 log.debug(u"No startEncryption method found for {plugin}".format( |
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155 plugin = plugin.namespace)) |
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156 return defer.succeed(None) |
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157 else: |
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158 # we copy entity to avoid having the resource changed by stop_encryption |
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159 return defer.maybeDeferred(start_encryption, self.client, copy.copy(entity)) |
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160 |
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161 def _stopEncryption(self, plugin, entity): |
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162 """Stop encryption with a plugin |
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163 |
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164 This method must be called just before removing a plugin session. |
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165 StopEncryptionn method of plugin will be called if it exists. |
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166 """ |
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167 try: |
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168 stop_encryption = plugin.instance.stopEncryption |
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169 except AttributeError: |
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170 log.debug(u"No stopEncryption method found for {plugin}".format( |
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171 plugin = plugin.namespace)) |
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172 return defer.succeed(None) |
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173 else: |
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174 # we copy entity to avoid having the resource changed by stop_encryption |
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175 return defer.maybeDeferred(stop_encryption, self.client, copy.copy(entity)) |
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176 |
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177 @defer.inlineCallbacks |
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178 def start(self, entity, namespace=None, replace=False): |
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179 """Start an encryption session with an entity |
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180 |
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181 @param entity(jid.JID): entity to start an encryption session with |
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182 must be bare jid is the algorithm encrypt for all devices |
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183 @param namespace(unicode, None): namespace of the encryption algorithm |
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184 to use. |
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185 None to select automatically an algorithm |
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186 @param replace(bool): if True and an encrypted session already exists, |
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187 it will be replaced by the new one |
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188 """ |
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189 if not self.plugins: |
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190 raise exceptions.NotFound(_(u"No encryption plugin is registered, " |
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191 u"an encryption session can't be started")) |
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192 |
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193 if namespace is None: |
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194 plugin = self.plugins[0] |
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195 else: |
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196 plugin = self.getPlugin(namespace) |
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197 |
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198 bare_jid = entity.userhostJID() |
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199 if bare_jid in self._sessions: |
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200 # we have already an encryption session with this contact |
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201 former_plugin = self._sessions[bare_jid][u"plugin"] |
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202 if former_plugin.namespace == namespace: |
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203 log.info(_(u"Session with {bare_jid} is already encrypted with {name}. " |
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204 u"Nothing to do.").format( |
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205 bare_jid=bare_jid, name=former_plugin.name)) |
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206 return |
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207 |
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208 if replace: |
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209 # there is a conflict, but replacement is requested |
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210 # so we stop previous encryption to use new one |
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211 del self._sessions[bare_jid] |
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212 yield self._stopEncryption(former_plugin, entity) |
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213 else: |
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214 msg = (_(u"Session with {bare_jid} is already encrypted with {name}. " |
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215 u"Please stop encryption session before changing algorithm.") |
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216 .format(bare_jid=bare_jid, name=plugin.name)) |
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217 log.warning(msg) |
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218 raise exceptions.ConflictError(msg) |
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219 |
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220 data = {"plugin": plugin} |
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221 if plugin.directed: |
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222 if not entity.resource: |
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223 entity.resource = self.host.memory.getMainResource(self.client, entity) |
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224 if not entity.resource: |
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225 raise exceptions.NotFound( |
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226 _(u"No resource found for {destinee}, can't encrypt with {name}") |
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227 .format(destinee=entity.full(), name=plugin.name)) |
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228 log.info(_(u"No resource specified to encrypt with {name}, using " |
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229 u"{destinee}.").format(destinee=entity.full(), |
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230 name=plugin.name)) |
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231 # indicate that we encrypt only for some devices |
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232 directed_devices = data[u'directed_devices'] = [entity.resource] |
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233 elif entity.resource: |
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234 raise ValueError(_(u"{name} encryption must be used with bare jids.")) |
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235 |
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236 yield self._startEncryption(plugin, entity) |
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237 self._sessions[entity.userhostJID()] = data |
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238 log.info(_(u"Encryption session has been set for {entity_jid} with " |
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239 u"{encryption_name}").format( |
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240 entity_jid=entity.full(), encryption_name=plugin.name)) |
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241 self.host.bridge.messageEncryptionStarted( |
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242 entity.full(), |
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243 self.getBridgeData(data), |
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244 self.client.profile) |
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245 msg = D_(u"Encryption session started: your messages with {destinee} are " |
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246 u"now end to end encrypted using {name} algorithm.").format( |
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247 destinee=entity.full(), name=plugin.name) |
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248 directed_devices = data.get(u'directed_devices') |
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249 if directed_devices: |
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250 msg += u"\n" + D_(u"Message are encrypted only for {nb_devices} device(s): " |
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251 u"{devices_list}.").format( |
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252 nb_devices=len(directed_devices), |
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253 devices_list = u', '.join(directed_devices)) |
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254 |
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255 self.client.feedback(bare_jid, msg) |
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256 |
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257 @defer.inlineCallbacks |
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258 def stop(self, entity, namespace=None): |
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259 """Stop an encryption session with an entity |
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260 |
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261 @param entity(jid.JID): entity with who the encryption session must be stopped |
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262 must be bare jid if the algorithm encrypt for all devices |
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263 @param namespace(unicode): namespace of the session to stop |
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264 when specified, used to check we stop the right encryption session |
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265 """ |
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266 session = self.getSession(entity.userhostJID()) |
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267 if not session: |
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268 raise failure.Failure( |
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269 exceptions.NotFound(_(u"There is no encryption session with this " |
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270 u"entity."))) |
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271 plugin = session['plugin'] |
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272 if namespace is not None and plugin.namespace != namespace: |
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273 raise exceptions.InternalError(_( |
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274 u"The encryption session is not run with the expected plugin: encrypted " |
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275 u"with {current_name} and was expecting {expected_name}").format( |
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276 current_name=session[u'plugin'].namespace, |
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277 expected_name=namespace)) |
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278 if entity.resource: |
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279 try: |
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280 directed_devices = session[u'directed_devices'] |
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281 except KeyError: |
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282 raise exceptions.NotFound(_( |
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283 u"There is a session for the whole entity (i.e. all devices of the " |
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284 u"entity), not a directed one. Please use bare jid if you want to " |
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285 u"stop the whole encryption with this entity.")) |
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286 |
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287 try: |
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288 directed_devices.remove(entity.resource) |
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289 except ValueError: |
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290 raise exceptions.NotFound(_(u"There is no directed session with this " |
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291 u"entity.")) |
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292 else: |
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293 if not directed_devices: |
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294 # if we have no more directed device sessions, |
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295 # we stop the whole session |
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296 # see comment below for deleting session before stopping encryption |
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297 del self._sessions[entity.userhostJID()] |
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298 yield self._stopEncryption(plugin, entity) |
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299 else: |
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300 # plugin's stopEncryption may call stop again (that's the case with OTR) |
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301 # so we need to remove plugin from session before calling self._stopEncryption |
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302 del self._sessions[entity.userhostJID()] |
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303 yield self._stopEncryption(plugin, entity) |
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304 |
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305 log.info(_(u"encryption session stopped with entity {entity}").format( |
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306 entity=entity.full())) |
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307 self.host.bridge.messageEncryptionStopped( |
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308 entity.full(), |
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309 {'name': plugin.name, |
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310 'namespace': plugin.namespace, |
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311 }, |
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312 self.client.profile) |
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313 msg = D_(u"Encryption session finished: your messages with {destinee} are " |
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314 u"NOT end to end encrypted anymore.\nYour server administrators or " |
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315 u"{destinee} server administrators will be able to read them.").format( |
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316 destinee=entity.full()) |
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317 |
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318 self.client.feedback(entity, msg) |
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319 |
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320 def getSession(self, entity): |
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321 """Get encryption session for this contact |
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322 |
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323 @param entity(jid.JID): get the session for this entity |
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324 must be a bare jid |
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325 @return (dict, None): encryption session data |
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326 None if there is not encryption for this session with this jid |
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327 """ |
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328 if entity.resource: |
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329 raise ValueError(u"Full jid given when expecting bare jid") |
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330 return self._sessions.get(entity) |
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331 |
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332 def getTrustUI(self, entity_jid, namespace=None): |
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333 """Retrieve encryption UI |
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334 |
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335 @param entity_jid(jid.JID): get the UI for this entity |
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336 must be a bare jid |
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337 @param namespace(unicode): namespace of the algorithm to manage |
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338 if None use current algorithm |
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339 @return D(xmlui): XMLUI for trust management |
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340 the xmlui is a form |
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341 None if there is not encryption for this session with this jid |
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342 @raise exceptions.NotFound: no algorithm/plugin found |
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343 @raise NotImplementedError: plugin doesn't handle UI management |
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344 """ |
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345 if namespace is None: |
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346 session = self.getSession(entity_jid) |
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347 if not session: |
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348 raise exceptions.NotFound( |
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349 u"No encryption session currently active for {entity_jid}" |
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350 .format(entity_jid=entity_jid.full())) |
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351 plugin = session['plugin'] |
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352 else: |
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353 plugin = self.getPlugin(namespace) |
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354 try: |
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355 get_trust_ui = plugin.instance.getTrustUI |
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356 except AttributeError: |
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357 raise NotImplementedError( |
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358 u"Encryption plugin doesn't handle trust management UI") |
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359 else: |
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360 return defer.maybeDeferred(get_trust_ui, self.client, entity_jid) |
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361 |
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362 ## Menus ## |
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363 |
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364 @classmethod |
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365 def _importMenus(cls, host): |
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366 host.importMenu( |
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367 (D_(u"Encryption"), D_(u"unencrypted (plain text)")), |
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368 partial(cls._onMenuUnencrypted, host=host), |
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369 security_limit=0, |
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370 help_string=D_(u"End encrypted session"), |
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371 type_=C.MENU_SINGLE, |
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372 ) |
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373 for plg in cls.getPlugins(): |
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374 host.importMenu( |
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375 (D_(u"Encryption"), plg.name), |
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376 partial(cls._onMenuName, host=host, plg=plg), |
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377 security_limit=0, |
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378 help_string=D_(u"Start {name} session").format(name=plg.name), |
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379 type_=C.MENU_SINGLE, |
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380 ) |
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381 host.importMenu( |
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382 (D_(u"Encryption"), D_(u"⛨ {name} trust").format(name=plg.name)), |
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383 partial(cls._onMenuTrust, host=host, plg=plg), |
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384 security_limit=0, |
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385 help_string=D_(u"Manage {name} trust").format(name=plg.name), |
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386 type_=C.MENU_SINGLE, |
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387 ) |
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388 |
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389 @classmethod |
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390 def _onMenuUnencrypted(cls, data, host, profile): |
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391 client = host.getClient(profile) |
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392 peer_jid = jid.JID(data[u'jid']).userhostJID() |
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393 d = client.encryption.stop(peer_jid) |
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394 d.addCallback(lambda __: {}) |
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395 return d |
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396 |
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397 @classmethod |
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398 def _onMenuName(cls, data, host, plg, profile): |
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399 client = host.getClient(profile) |
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400 peer_jid = jid.JID(data[u'jid']) |
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401 if not plg.directed: |
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402 peer_jid = peer_jid.userhostJID() |
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403 d = client.encryption.start(peer_jid, plg.namespace, replace=True) |
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404 d.addCallback(lambda __: {}) |
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405 return d |
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406 |
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407 @classmethod |
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408 @defer.inlineCallbacks |
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409 def _onMenuTrust(cls, data, host, plg, profile): |
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410 client = host.getClient(profile) |
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411 peer_jid = jid.JID(data[u'jid']).userhostJID() |
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412 ui = yield client.encryption.getTrustUI(peer_jid, plg.namespace) |
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413 defer.returnValue({u'xmlui': ui.toXml()}) |
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414 |
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415 ## Triggers ## |
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416 |
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417 def setEncryptionFlag(self, mess_data): |
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418 """Set "encryption" key in mess_data if session with destinee is encrypted""" |
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419 |
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420 if mess_data["type"] == "groupchat": |
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421 # FIXME: to change when group chat encryption will be handled |
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422 return |
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423 |
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424 to_jid = mess_data['to'] |
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425 encryption = self._sessions.get(to_jid.userhostJID()) |
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426 if encryption is not None: |
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427 mess_data[C.MESS_KEY_ENCRYPTION] = encryption |
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428 |
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429 ## Misc ## |
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430 |
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431 def markAsEncrypted(self, mess_data): |
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432 """Helper method to mark a message as having been e2e encrypted. |
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433 |
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434 This should be used in the post_treat workflow of MessageReceived trigger of |
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435 the plugin |
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436 @param mess_data(dict): message data as used in post treat workflow |
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437 """ |
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438 mess_data[C.MESS_KEY_ENCRYPTED] = True |
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439 return mess_data |
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440 |
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441 def markAsTrusted(self, mess_data): |
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442 """Helper methor to mark a message as sent from a trusted entity. |
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443 |
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444 This should be used in the post_treat workflow of MessageReceived trigger of |
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445 the plugin |
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446 @param mess_data(dict): message data as used in post treat workflow |
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447 """ |
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448 mess_data[C.MESS_KEY_TRUSTED] = True |
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449 return mess_data |
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450 |
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451 def markAsUntrusted(self, mess_data): |
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452 """Helper methor to mark a message as sent from an untrusted entity. |
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453 |
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454 This should be used in the post_treat workflow of MessageReceived trigger of |
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455 the plugin |
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456 @param mess_data(dict): message data as used in post treat workflow |
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457 """ |
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458 mess_data['trusted'] = False |
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459 return mess_data |