Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_sec_pte.py @ 4118:07370d2a9bde

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plugin XEP-0167: keep media order when starting a call: media content order is relevant when building Jingle contents/SDP notably for bundling. This patch fixes the previous behaviour of always using the same order by keeping the order of the data (i.e. order of original SDP offer). Previous behaviour could lead to call failure. rel 424
author Goffi <goffi@goffi.org>
date Tue, 03 Oct 2023 15:15:24 +0200
parents 4b842c1fb686
children 0d7bb4df2343
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3972
5fbdf986670c plugin pte: Pubsub Target Encryption implementation:
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parents:
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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
4071
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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 (payload is not None
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130 and payload.name == "encrypted"
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131 and payload.uri == NS_PTE):
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132 encrypted_elt = payload
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133 item.children.clear()
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134 try:
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135 encryption_type = encrypted_elt.getAttribute("type")
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136 encrypted_by = jid.JID(encrypted_elt["by"])
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137 except (KeyError, RuntimeError):
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138 raise exceptions.DataError(
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139 f"invalid <encrypted> element: {encrypted_elt.toXml()}"
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140 )
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141 if encryption_type!= self._o.NS_TWOMEMO:
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142 raise NotImplementedError("only TWOMEMO is supported for now")
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143 log.debug(f"decrypting item {item.getAttribute('id', '')}")
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144
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145 # FIXME: we do use _message_received_trigger now to decrypt the stanza, a
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146 # cleaner separated decrypt method should be used
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147 encrypted_elt["from"] = encrypted_by.full()
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148 if not await self._o._message_received_trigger(
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149 client,
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150 encrypted_elt,
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151 defer.Deferred()
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152 ) or not encrypted_elt.children:
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153 raise exceptions.EncryptionError("can't decrypt the message")
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154
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155 item.addChild(encrypted_elt.firstChildElement())
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156
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157 extra.setdefault("encrypted", {})[item["id"]] = {
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158 "type": NS_PTE,
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159 "algorithm": encryption_type
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160 }
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161 return True
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162
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163
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164 @implementer(iwokkel.IDisco)
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165 class PTE_Handler(xmlstream.XMPPHandler):
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166
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167 def getDiscoInfo(self, requestor, service, nodeIdentifier=""):
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168 return [disco.DiscoFeature(NS_PTE)]
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169
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170 def getDiscoItems(self, requestor, service, nodeIdentifier=""):
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171 return []