Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_sec_pte.py @ 4351:6a0a081485b8

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plugin autocrypt: Autocrypt protocol implementation: Implementation of autocrypt: `autocrypt` header is checked, and if present and no public key is known for the peer, the key is imported. `autocrypt` header is also added to outgoing message (only if an email gateway is detected). For the moment, the JID is use as identifier, but the real email used by gateway should be used in the future. rel 456
author Goffi <goffi@goffi.org>
date Fri, 28 Feb 2025 09:23:35 +0100
parents 0d7bb4df2343
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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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 []