Mercurial > libervia-backend
annotate libervia/backend/plugins/plugin_xep_0391.py @ 4232:0fbe5c605eb6
tests (unit/webrtc,XEP-0176, XEP-0234): Fix tests and add webrtc file transfer tests:
fix 441
author | Goffi <goffi@goffi.org> |
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date | Sat, 06 Apr 2024 12:59:50 +0200 (8 months ago) |
parents | e11b13418ba6 |
children | 0d7bb4df2343 |
rev | line source |
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plugin XEP-0391: implement XEP-0391 (Jingle Encrypted Transports) + XEP-0396 (JET-OMEMO):
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1 #!/usr/bin/env python3 |
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2 |
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3 # Libervia plugin for Jingle Encrypted Transports |
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4 # Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org) |
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5 |
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6 # This program is free software: you can redistribute it and/or modify |
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7 # it under the terms of the GNU Affero General Public License as published by |
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8 # the Free Software Foundation, either version 3 of the License, or |
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9 # (at your option) any later version. |
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10 |
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11 # This program is distributed in the hope that it will be useful, |
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 # GNU Affero General Public License for more details. |
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15 |
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16 # You should have received a copy of the GNU Affero General Public License |
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 |
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19 from base64 import b64encode |
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20 from functools import partial |
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21 import io |
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22 from typing import Any, Callable, Dict, List, Optional, Tuple, Union |
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23 |
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24 from twisted.words.protocols.jabber import error, jid, xmlstream |
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25 from twisted.words.xish import domish |
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26 from wokkel import disco, iwokkel |
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27 from zope.interface import implementer |
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28 from cryptography.exceptions import AlreadyFinalized |
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29 from cryptography.hazmat import backends |
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30 from cryptography.hazmat.primitives import ciphers |
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31 from cryptography.hazmat.primitives.ciphers import Cipher, CipherContext, modes |
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32 from cryptography.hazmat.primitives.padding import PKCS7, PaddingContext |
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33 |
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34 from libervia.backend.core import exceptions |
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35 from libervia.backend.core.constants import Const as C |
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36 from libervia.backend.core.core_types import SatXMPPEntity |
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37 from libervia.backend.core.i18n import _ |
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38 from libervia.backend.core.log import getLogger |
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39 from libervia.backend.tools import xml_tools |
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40 |
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41 try: |
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42 import oldmemo |
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43 import oldmemo.etree |
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44 except ImportError as import_error: |
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45 raise exceptions.MissingModule( |
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46 "You are missing one or more package required by the OMEMO plugin. Please" |
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47 " download/install the pip packages 'oldmemo'." |
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48 ) from import_error |
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49 |
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50 |
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51 log = getLogger(__name__) |
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52 |
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53 IMPORT_NAME = "XEP-0391" |
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54 |
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55 PLUGIN_INFO = { |
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56 C.PI_NAME: "Jingle Encrypted Transports", |
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57 C.PI_IMPORT_NAME: IMPORT_NAME, |
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58 C.PI_TYPE: C.PLUG_TYPE_XEP, |
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59 C.PI_MODES: C.PLUG_MODE_BOTH, |
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60 C.PI_PROTOCOLS: ["XEP-0391", "XEP-0396"], |
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61 C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0384"], |
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62 C.PI_MAIN: "JET", |
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63 C.PI_HANDLER: "yes", |
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64 C.PI_DESCRIPTION: _("""End-to-end encryption of Jingle transports"""), |
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65 } |
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66 |
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67 NS_JET = "urn:xmpp:jingle:jet:0" |
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68 NS_JET_OMEMO = "urn:xmpp:jingle:jet-omemo:0" |
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69 |
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70 |
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71 class JET: |
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72 namespace = NS_JET |
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73 |
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74 def __init__(self, host): |
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75 log.info(_("XEP-0391 (Pubsub Attachments) plugin initialization")) |
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76 host.register_namespace("jet", NS_JET) |
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77 self.host = host |
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78 self._o = host.plugins["XEP-0384"] |
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79 self._j = host.plugins["XEP-0166"] |
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80 host.trigger.add( |
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81 "XEP-0166_initiate_elt_built", |
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82 self._on_initiate_elt_build |
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83 ) |
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84 host.trigger.add( |
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85 "XEP-0166_on_session_initiate", |
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86 self._on_session_initiate |
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87 ) |
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88 host.trigger.add( |
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89 "XEP-0234_jingle_handler", |
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90 self._add_encryption_filter |
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91 ) |
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92 host.trigger.add( |
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93 "XEP-0234_file_receiving_request_conf", |
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94 self._add_encryption_filter |
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95 ) |
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96 |
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97 def get_handler(self, client): |
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98 return JET_Handler() |
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99 |
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100 async def _on_initiate_elt_build( |
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101 self, |
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102 client: SatXMPPEntity, |
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103 session: Dict[str, Any], |
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104 iq_elt: domish.Element, |
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105 jingle_elt: domish.Element |
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106 ) -> bool: |
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107 if client.encryption.get_namespace( |
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108 session["peer_jid"].userhostJID() |
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109 ) != self._o.NS_OLDMEMO: |
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110 return True |
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111 for content_elt in jingle_elt.elements(self._j.namespace, "content"): |
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112 content_data = session["contents"][content_elt["name"]] |
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113 transport_data = content_data["transport_data"] |
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114 if transport_data.get("webrtc"): |
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115 # webRTC is already e2e encrypted, we skip this content to avoid double |
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116 # encryption |
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117 continue |
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118 security_elt = content_elt.addElement((NS_JET, "security")) |
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119 security_elt["name"] = content_elt["name"] |
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120 # XXX: for now only OLDMEMO is supported, thus we do it directly here. If some |
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121 # other are supported in the future, a plugin registering mechanism will be |
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122 # implemented. |
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123 cipher = "urn:xmpp:ciphers:aes-128-gcm-nopadding" |
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124 enc_type = "eu.siacs.conversations.axolotl" |
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125 security_elt["cipher"] = cipher |
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126 security_elt["type"] = enc_type |
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127 encryption_data = content_data["encryption"] = { |
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128 "cipher": cipher, |
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129 "type": enc_type |
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130 } |
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131 session_manager = await self._o.get_session_manager(client.profile) |
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132 await self._o.download_missing_device_lists( |
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133 client, self._o.NS_OLDMEMO, {session["peer_jid"]}, session_manager |
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134 ) |
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135 try: |
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136 messages, encryption_errors = await session_manager.encrypt( |
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137 frozenset({session["peer_jid"].userhost()}), |
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138 # the value seems to be the commonly used value |
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139 { self._o.NS_OLDMEMO: b" " }, |
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140 backend_priority_order=[ self._o.NS_OLDMEMO ], |
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141 identifier = client.jid.userhost() |
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142 ) |
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143 except Exception as e: |
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144 log.exception("Can't generate IV and keys") |
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145 raise e |
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146 message, plain_key_material = next(iter(messages.items())) |
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147 iv, key = message.content.initialization_vector, plain_key_material.key |
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148 content_data["encryption"].update({ |
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149 "iv": iv, |
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150 "key": key |
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151 }) |
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152 encrypted_elt = xml_tools.et_elt_2_domish_elt( |
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153 oldmemo.etree.serialize_message(message) |
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154 ) |
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155 security_elt.addChild(encrypted_elt) |
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156 return True |
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157 |
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158 async def _on_session_initiate( |
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159 self, |
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160 client: SatXMPPEntity, |
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161 session: Dict[str, Any], |
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162 iq_elt: domish.Element, |
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163 jingle_elt: domish.Element |
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164 ) -> bool: |
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165 for content_elt in jingle_elt.elements(self._j.namespace, "content"): |
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166 content_data = session["contents"][content_elt["name"]] |
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167 security_elt = next(content_elt.elements(NS_JET, "security"), None) |
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168 if security_elt is None: |
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169 continue |
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170 encrypted_elt = next( |
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171 security_elt.elements(self._o.NS_OLDMEMO, "encrypted"), None |
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172 ) |
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173 if encrypted_elt is None: |
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174 log.warning( |
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175 "missing <encrypted> element, can't decrypt: {security_elt.toXml()}" |
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176 ) |
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177 continue |
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178 session_manager = await self._o.get_session_manager(client.profile) |
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179 try: |
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180 message = await oldmemo.etree.parse_message( |
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181 xml_tools.domish_elt_2_et_elt(encrypted_elt, False), |
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182 session["peer_jid"].userhost(), |
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183 client.jid.userhost(), |
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184 session_manager |
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185 ) |
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186 __, __, plain_key_material = await session_manager.decrypt(message) |
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187 except Exception as e: |
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188 log.warning(f"Can't get IV and key: {e}\n{security_elt.toXml()}") |
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189 continue |
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190 try: |
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191 content_data["encryption"] = { |
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192 "cipher": security_elt["cipher"], |
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193 "type": security_elt["type"], |
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194 "iv": message.content.initialization_vector, |
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195 "key": plain_key_material.key |
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196 } |
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197 except KeyError as e: |
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198 log.warning(f"missing data, can't decrypt: {e}") |
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199 continue |
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200 |
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201 return True |
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202 |
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203 def __encrypt( |
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204 self, |
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205 data: bytes, |
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206 encryptor: CipherContext, |
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207 data_cb: Callable |
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208 ) -> bytes: |
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209 data_cb(data) |
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210 if data: |
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211 return encryptor.update(data) |
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212 else: |
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213 try: |
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214 return encryptor.finalize() + encryptor.tag |
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215 except AlreadyFinalized: |
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216 return b'' |
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217 |
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218 def __decrypt( |
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219 self, |
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220 data: bytes, |
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221 buffer: list[bytes], |
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222 decryptor: CipherContext, |
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223 data_cb: Callable |
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224 ) -> bytes: |
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225 buffer.append(data) |
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226 data = b''.join(buffer) |
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227 buffer.clear() |
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228 if len(data) > 16: |
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229 decrypted = decryptor.update(data[:-16]) |
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230 data_cb(decrypted) |
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231 else: |
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232 decrypted = b'' |
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233 buffer.append(data[-16:]) |
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234 return decrypted |
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235 |
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236 def __decrypt_finalize( |
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237 self, |
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238 file_obj: io.BytesIO, |
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239 buffer: list[bytes], |
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240 decryptor: CipherContext, |
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241 ) -> None: |
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242 tag = b''.join(buffer) |
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243 file_obj.write(decryptor.finalize_with_tag(tag)) |
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244 |
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245 async def _add_encryption_filter( |
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246 self, |
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247 client: SatXMPPEntity, |
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248 session: Dict[str, Any], |
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249 content_data: Dict[str, Any], |
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250 elt: domish.Element |
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251 ) -> bool: |
4231
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252 try: |
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253 file_obj = content_data["stream_object"].file_obj |
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254 except KeyError: |
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255 transport_data = content_data["transport_data"] |
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256 if transport_data.get("webrtc"): |
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257 # we skip JET to avoid double encryption |
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258 log.debug("JET skipped due to webrtc transport.") |
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259 return True |
3969
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260 try: |
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261 encryption_data=content_data["encryption"] |
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262 except KeyError: |
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263 return True |
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264 cipher = ciphers.Cipher( |
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265 ciphers.algorithms.AES(encryption_data["key"]), |
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266 modes.GCM(encryption_data["iv"]), |
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267 backend=backends.default_backend(), |
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268 ) |
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269 if file_obj.mode == "wb": |
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270 # we are receiving a file |
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271 buffer = [] |
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272 decryptor = cipher.decryptor() |
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273 file_obj.pre_close_cb = partial( |
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274 self.__decrypt_finalize, |
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275 file_obj=file_obj, |
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276 buffer=buffer, |
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277 decryptor=decryptor |
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278 ) |
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279 file_obj.data_cb = partial( |
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280 self.__decrypt, |
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281 buffer=buffer, |
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282 decryptor=decryptor, |
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283 data_cb=file_obj.data_cb |
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284 ) |
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285 else: |
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286 # we are sending a file |
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287 file_obj.data_cb = partial( |
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288 self.__encrypt, |
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289 encryptor=cipher.encryptor(), |
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290 data_cb=file_obj.data_cb |
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291 ) |
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292 |
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293 return True |
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294 |
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295 |
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296 @implementer(iwokkel.IDisco) |
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297 class JET_Handler(xmlstream.XMPPHandler): |
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298 |
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299 def getDiscoInfo(self, requestor, service, nodeIdentifier=""): |
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300 return [ |
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301 disco.DiscoFeature(NS_JET), |
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302 disco.DiscoFeature(NS_JET_OMEMO), |
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303 ] |
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304 |
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305 def getDiscoItems(self, requestor, service, nodeIdentifier=""): |
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306 return [] |