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annotate sat/plugins/plugin_xep_0380.py @ 3231:e756e0eb1be4

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core (memory/encryption): automatic start encryption if peer send encrypted message: If peer sends encrypted message and we have no encryption activated, we automatically start encryption to avoid sending plain text message when answering. markAsEncrypted now needs the encryption algorithm namespace as mandatory argument.
author Goffi <goffi@goffi.org>
date Mon, 23 Mar 2020 17:52:18 +0100
parents dcebc585c29f
children be6d91572633
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) 2009-2020 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 sat.core.i18n import _, D_
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21 from sat.core.constants import Const as C
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22 from sat.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._sendMessageTrigger)
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51 host.trigger.add("messageReceived", self._messageReceivedTrigger, priority=100)
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52 host.registerNamespace("eme", NS_EME)
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53
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54 def _addEMEElement(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 _sendMessageTrigger(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._addEMEElement, namespace=namespace, name=name)
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72 return True
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73
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74 def _messageReceivedTrigger(self, client, message_elt, post_treat):
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75 try:
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76 encryption_elt = next(message_elt.elements(NS_EME, 'encryption'))
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77 except StopIteration:
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78 return True
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79
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80 namespace = encryption_elt['namespace']
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81 if namespace in client.encryption.getNamespaces():
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82 # message is encrypted and we can decrypt it
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83 return True
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84
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85 name = KNOWN_NAMESPACES.get(namespace, encryption_elt.getAttribute("name"))
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86
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87 # at this point, message is encrypted but we know that we can't decrypt it,
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88 # we need to notify the user
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89 sender_s = message_elt['from']
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90 to_jid = jid.JID(message_elt['from'])
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91 algorithm = "{} [{}]".format(name, namespace) if name else namespace
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92 log.warning(
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93 _("Message from {sender} is encrypted with {algorithm} and we can't "
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94 "decrypt it.".format(sender=message_elt['from'], algorithm=algorithm)))
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95
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96 user_msg = D_(
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97 "User {sender} sent you an encrypted message (encrypted with {algorithm}), "
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98 "and we can't decrypt it.").format(sender=sender_s, algorithm=algorithm)
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99
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100 extra = {C.MESS_EXTRA_INFO: C.EXTRA_INFO_DECR_ERR}
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101 client.feedback(to_jid, user_msg, extra)
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102 return False