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annotate sat/plugins/plugin_xep_0380.py @ 2750:ae495f27b316

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plugin XEP-0380: Explicit Message Encryption implementation
author Goffi <goffi@goffi.org>
date Fri, 04 Jan 2019 11:14:53 +0100
parents
children 3bea6b5ae972
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2750
ae495f27b316 plugin XEP-0380: Explicit Message Encryption implementation
Goffi <goffi@goffi.org>
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1 #!/usr/bin/env python2
ae495f27b316 plugin XEP-0380: Explicit Message Encryption implementation
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for Explicit Message Encryption
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5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)
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6
ae495f27b316 plugin XEP-0380: Explicit Message Encryption implementation
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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
ae495f27b316 plugin XEP-0380: Explicit Message Encryption implementation
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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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16
ae495f27b316 plugin XEP-0380: Explicit Message Encryption implementation
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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
ae495f27b316 plugin XEP-0380: Explicit Message Encryption implementation
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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: u"Explicit Message Encryption",
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29 C.PI_IMPORT_NAME: u"XEP-0380",
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30 C.PI_TYPE: u"SEC",
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31 C.PI_PROTOCOLS: [u"XEP-0380"],
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32 C.PI_DEPENDENCIES: [],
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33 C.PI_MAIN: u"XEP_0380",
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34 C.PI_HANDLER: u"no",
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35 C.PI_DESCRIPTION: _(u"""Implementation of Explicit Message Encryption"""),
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36 }
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37
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38 NS_EME = u"urn:xmpp:eme:0"
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39 KNOWN_NAMESPACES = {
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40 u"urn:xmpp:otr:0": u"OTR",
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41 u"jabber:x:encrypted": u"Legacy OpenPGP",
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42 u"urn:xmpp:openpgp:0": u"OpenPGP for XMPP",
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43 }
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44
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45
ae495f27b316 plugin XEP-0380: Explicit Message Encryption implementation
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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
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53 def _addEMEElement(self, mess_data, namespace, name):
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54 message_elt = mess_data[u'xml']
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55 encryption_elt = message_elt.addElement((NS_EME, u'encryption'))
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56 encryption_elt[u'namespace'] = namespace
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57 if name is not None:
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58 encryption_elt[u'name'] = name
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59 return mess_data
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60
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61 def _sendMessageTrigger(self, client, mess_data, __, post_xml_treatments):
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62 encryption = mess_data.get(C.MESS_KEY_ENCRYPTION)
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63 if encryption is not None:
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64 namespace = encryption['plugin'].namespace
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65 if namespace not in KNOWN_NAMESPACES:
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66 name = encryption[u'plugin'].name
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67 else:
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68 name = None
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69 post_xml_treatments.addCallback(
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70 self._addEMEElement, namespace=namespace, name=name)
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71 return True
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72
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73 def _MessageReceivedTrigger(self, client, message_elt, post_treat):
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74 try:
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75 encryption_elt = next(message_elt.elements(NS_EME, u'encryption'))
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76 except StopIteration:
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77 return True
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78
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79 namespace = encryption_elt['namespace']
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80 if namespace in client.encryption.getNamespaces():
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81 # message is encrypted and we can decrypt it
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82 return True
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83
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84 name = KNOWN_NAMESPACES.get(namespace, encryption_elt.getAttribute(u"name"))
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85
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86 # at this point, message is encrypted but we know that we can't decrypt it,
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87 # we need to notify the user
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88 sender_s = message_elt[u'from']
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89 to_jid = jid.JID(message_elt[u'from'])
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90 algorithm = u"{} [{}]".format(name, namespace) if name else namespace
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91 log.warning(
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92 _(u"Message from {sender} is encrypted with {algorithm} and we can't "
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93 u"decrypt it.".format(sender=message_elt['from'], algorithm=algorithm)))
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94
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95 user_msg = D_(
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96 u"User {sender} sent you an encrypted message (encrypted with {algorithm}), "
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97 u"and we can't decrypt it.").format(sender=sender_s, algorithm=algorithm)
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98
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99 extra = {C.MESS_EXTRA_INFO: u"UNKNOWN_ENCRYPTION"}
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100 client.feedback(to_jid, user_msg, extra)
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101 return False