Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_sec_pte.py @ 4188:5a835b320726

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docker (backend-dev): update Debian version + getting OMEMO related packages from git is not necessary anymore
author Goffi <goffi@goffi.org>
date Mon, 11 Dec 2023 00:53:59 +0100
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
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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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Goffi <goffi@goffi.org>
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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
5fbdf986670c plugin pte: Pubsub Target Encryption implementation:
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163
5fbdf986670c plugin pte: Pubsub Target Encryption implementation:
Goffi <goffi@goffi.org>
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164 @implementer(iwokkel.IDisco)
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165 class PTE_Handler(xmlstream.XMPPHandler):
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166
5fbdf986670c plugin pte: Pubsub Target Encryption implementation:
Goffi <goffi@goffi.org>
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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
5fbdf986670c plugin pte: Pubsub Target Encryption implementation:
Goffi <goffi@goffi.org>
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170 def getDiscoItems(self, requestor, service, nodeIdentifier=""):
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171 return []