Mercurial > libervia-backend
annotate libervia/backend/plugins/plugin_sec_pte.py @ 4291:39ac821ebbdb
plugin XEP-0167: handle conferences:
- SDP can now be answered by component instead of frontend. This is useful for A/V
conferences component to handle A/V call jingle sessions.
- new `call_update` and method, and `content-add` action preparation. This is not yet used
by A/V conference, but it's a preparation for a potential future use.
- Add NS_AV_CONFERENCES to features as required by the newly proposed A/V Conferences
protoXEP.
rel 447
author | Goffi <goffi@goffi.org> |
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date | Mon, 29 Jul 2024 03:31:09 +0200 |
parents | 0d7bb4df2343 |
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rev | line source |
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1 #!/usr/bin/env python3 |
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2 |
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3 # Libervia plugin for Pubsub Targeted Encryption |
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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 typing import Any, Dict, List, Optional |
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20 |
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21 from twisted.internet import defer |
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22 from twisted.words.protocols.jabber import jid, xmlstream |
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23 from twisted.words.xish import domish |
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24 from wokkel import disco, iwokkel |
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25 from wokkel import rsm |
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26 from zope.interface import implementer |
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27 |
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28 from libervia.backend.core import exceptions |
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29 from libervia.backend.core.constants import Const as C |
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30 from libervia.backend.core.core_types import SatXMPPEntity |
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31 from libervia.backend.core.i18n import _ |
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32 from libervia.backend.core.log import getLogger |
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33 |
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34 |
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35 log = getLogger(__name__) |
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36 |
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37 IMPORT_NAME = "PTE" |
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38 |
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39 PLUGIN_INFO = { |
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40 C.PI_NAME: "Pubsub Targeted Encryption", |
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41 C.PI_IMPORT_NAME: IMPORT_NAME, |
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42 C.PI_TYPE: C.PLUG_TYPE_XEP, |
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43 C.PI_MODES: C.PLUG_MODE_BOTH, |
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44 C.PI_PROTOCOLS: [], |
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45 C.PI_DEPENDENCIES: ["XEP-0060", "XEP-0384"], |
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46 C.PI_MAIN: "PTE", |
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47 C.PI_HANDLER: "yes", |
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48 C.PI_DESCRIPTION: _("""Encrypt some items to specific entities"""), |
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49 } |
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50 NS_PTE = "urn:xmpp:pte:0" |
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51 |
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52 |
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53 class PTE: |
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54 namespace = NS_PTE |
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55 |
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56 def __init__(self, host): |
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57 log.info(_("Pubsub Targeted Encryption plugin initialization")) |
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58 host.register_namespace("pte", NS_PTE) |
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59 self.host = host |
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60 self._o = host.plugins["XEP-0384"] |
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61 host.trigger.add("XEP-0060_publish", self._publish_trigger) |
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62 host.trigger.add("XEP-0060_items", self._items_trigger) |
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63 |
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64 def get_handler(self, client): |
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65 return PTE_Handler() |
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66 |
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67 async def _publish_trigger( |
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68 self, |
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69 client: SatXMPPEntity, |
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70 service: jid.JID, |
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71 node: str, |
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72 items: Optional[List[domish.Element]], |
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73 options: Optional[dict], |
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74 sender: jid.JID, |
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75 extra: Dict[str, Any], |
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76 ) -> bool: |
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77 if not items or extra.get("encrypted_for") is None: |
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78 return True |
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79 encrypt_data = extra["encrypted_for"] |
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80 try: |
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81 targets = {jid.JID(t) for t in encrypt_data["targets"]} |
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82 except (KeyError, RuntimeError): |
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83 raise exceptions.DataError(f"Invalid encryption data: {encrypt_data}") |
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84 for item in items: |
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85 log.debug( |
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86 f"encrypting item {item.getAttribute('id', '')} for " |
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87 f"{', '.join(t.full() for t in targets)}" |
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88 ) |
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89 encryption_type = encrypt_data.get("type", self._o.NS_TWOMEMO) |
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90 if encryption_type != self._o.NS_TWOMEMO: |
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91 raise NotImplementedError("only TWOMEMO is supported for now") |
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92 await self._o.encrypt( |
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93 client, |
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94 self._o.NS_TWOMEMO, |
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95 item, |
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96 targets, |
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97 is_muc_message=False, |
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98 stanza_id=None, |
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99 ) |
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100 item_elts = list(item.elements()) |
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101 if len(item_elts) != 1: |
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102 raise ValueError( |
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103 f"there should be exactly one item payload: {item.toXml()}" |
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104 ) |
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105 encrypted_payload = item_elts[0] |
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106 item.children.clear() |
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107 encrypted_elt = item.addElement((NS_PTE, "encrypted")) |
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108 encrypted_elt["by"] = sender.userhost() |
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109 encrypted_elt["type"] = encryption_type |
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110 encrypted_elt.addChild(encrypted_payload) |
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111 |
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112 return True |
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113 |
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114 async def _items_trigger( |
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115 self, |
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116 client: SatXMPPEntity, |
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117 service: Optional[jid.JID], |
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118 node: str, |
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119 items: List[domish.Element], |
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120 rsm_response: rsm.RSMResponse, |
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121 extra: Dict[str, Any], |
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122 ) -> bool: |
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123 if not extra.get(C.KEY_DECRYPT, True): |
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124 return True |
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125 if service is None: |
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126 service = client.jid.userhostJID() |
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127 for item in items: |
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128 payload = item.firstChildElement() |
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129 if ( |
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130 payload is not None |
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131 and payload.name == "encrypted" |
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132 and payload.uri == NS_PTE |
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133 ): |
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134 encrypted_elt = payload |
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135 item.children.clear() |
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136 try: |
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137 encryption_type = encrypted_elt.getAttribute("type") |
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138 encrypted_by = jid.JID(encrypted_elt["by"]) |
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139 except (KeyError, RuntimeError): |
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140 raise exceptions.DataError( |
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141 f"invalid <encrypted> element: {encrypted_elt.toXml()}" |
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142 ) |
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143 if encryption_type != self._o.NS_TWOMEMO: |
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144 raise NotImplementedError("only TWOMEMO is supported for now") |
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145 log.debug(f"decrypting item {item.getAttribute('id', '')}") |
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146 |
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147 # FIXME: we do use _message_received_trigger now to decrypt the stanza, a |
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148 # cleaner separated decrypt method should be used |
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149 encrypted_elt["from"] = encrypted_by.full() |
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150 if ( |
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151 not await self._o._message_received_trigger( |
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152 client, encrypted_elt, defer.Deferred() |
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153 ) |
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154 or not encrypted_elt.children |
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155 ): |
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156 raise exceptions.EncryptionError("can't decrypt the message") |
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157 |
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158 item.addChild(encrypted_elt.firstChildElement()) |
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159 |
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160 extra.setdefault("encrypted", {})[item["id"]] = { |
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161 "type": NS_PTE, |
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162 "algorithm": encryption_type, |
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163 } |
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164 return True |
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165 |
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166 |
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167 @implementer(iwokkel.IDisco) |
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168 class PTE_Handler(xmlstream.XMPPHandler): |
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169 |
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170 def getDiscoInfo(self, requestor, service, nodeIdentifier=""): |
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171 return [disco.DiscoFeature(NS_PTE)] |
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172 |
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173 def getDiscoItems(self, requestor, service, nodeIdentifier=""): |
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174 return [] |