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annotate libervia/backend/plugins/plugin_xep_0380.py @ 4340:ea72364131d5 default tip @

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doc (components): Update Email Gateway documentation: A section has been added to explain how attachments are handled. fix 453
author Goffi <goffi@goffi.org>
date Tue, 03 Dec 2024 00:53:18 +0100
parents 0d7bb4df2343
children
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT plugin for Explicit Message Encryption
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from libervia.backend.core.i18n import _, D_
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21 from libervia.backend.core.constants import Const as C
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22 from libervia.backend.core.log import getLogger
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23 from twisted.words.protocols.jabber import jid
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24
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25 log = getLogger(__name__)
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26
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27 PLUGIN_INFO = {
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28 C.PI_NAME: "Explicit Message Encryption",
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29 C.PI_IMPORT_NAME: "XEP-0380",
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30 C.PI_TYPE: "SEC",
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31 C.PI_PROTOCOLS: ["XEP-0380"],
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32 C.PI_DEPENDENCIES: [],
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33 C.PI_MAIN: "XEP_0380",
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34 C.PI_HANDLER: "no",
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35 C.PI_DESCRIPTION: _("""Implementation of Explicit Message Encryption"""),
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36 }
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37
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38 NS_EME = "urn:xmpp:eme:0"
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39 KNOWN_NAMESPACES = {
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40 "urn:xmpp:otr:0": "OTR",
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41 "jabber:x:encrypted": "Legacy OpenPGP",
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42 "urn:xmpp:openpgp:0": "OpenPGP for XMPP",
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43 }
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46 class XEP_0380(object):
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47
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48 def __init__(self, host):
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49 self.host = host
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50 host.trigger.add("sendMessage", self._send_message_trigger)
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51 host.trigger.add("message_received", self._message_received_trigger, priority=100)
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52 host.register_namespace("eme", NS_EME)
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53
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54 def _add_eme_element(self, mess_data, namespace, name):
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55 message_elt = mess_data["xml"]
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56 encryption_elt = message_elt.addElement((NS_EME, "encryption"))
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57 encryption_elt["namespace"] = namespace
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58 if name is not None:
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59 encryption_elt["name"] = name
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60 return mess_data
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61
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62 def _send_message_trigger(self, client, mess_data, __, post_xml_treatments):
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63 encryption = mess_data.get(C.MESS_KEY_ENCRYPTION)
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64 if encryption is not None:
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65 namespace = encryption["plugin"].namespace
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66 if namespace not in KNOWN_NAMESPACES:
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67 name = encryption["plugin"].name
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68 else:
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69 name = None
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70 post_xml_treatments.addCallback(
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71 self._add_eme_element, namespace=namespace, name=name
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72 )
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73 return True
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74
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75 def _message_received_trigger(self, client, message_elt, post_treat):
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76 try:
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77 encryption_elt = next(message_elt.elements(NS_EME, "encryption"))
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78 except StopIteration:
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79 return True
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80
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81 namespace = encryption_elt["namespace"]
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82 if namespace in client.encryption.get_namespaces():
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83 # message is encrypted and we can decrypt it
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84 return True
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85
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86 name = KNOWN_NAMESPACES.get(namespace, encryption_elt.getAttribute("name"))
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87
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88 # at this point, message is encrypted but we know that we can't decrypt it,
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89 # we need to notify the user
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90 sender_s = message_elt["from"]
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91 to_jid = jid.JID(message_elt["from"])
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92 algorithm = "{} [{}]".format(name, namespace) if name else namespace
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93 log.warning(
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94 _(
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95 "Message from {sender} is encrypted with {algorithm} and we can't "
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96 "decrypt it.".format(sender=message_elt["from"], algorithm=algorithm)
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97 )
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98 )
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99
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100 user_msg = D_(
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101 "User {sender} sent you an encrypted message (encrypted with {algorithm}), "
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102 "and we can't decrypt it."
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103 ).format(sender=sender_s, algorithm=algorithm)
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104
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105 extra = {C.MESS_EXTRA_INFO: C.EXTRA_INFO_DECR_ERR}
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106 client.feedback(to_jid, user_msg, extra)
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107 return False