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annotate sat/plugins/plugin_xep_0380.py @ 2846:58ea675d0f05

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quick frontend (app): added AUTO_RESYNC attribute in QuickApp, when set (default) the resync method is called on all widgets automatically: if AUTO_RESYNC is False, frontend must call itself the resync method. This is useful to improve performance, resynchronising all widgets at once may be resource intensive, and it may be more efficient to resync a widget only when it is visible.
author Goffi <goffi@goffi.org>
date Sun, 10 Mar 2019 18:02:42 +0100
parents 607cfc79e40f
children ab2696e34d29
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ae495f27b316 plugin XEP-0380: Explicit Message Encryption implementation
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1 #!/usr/bin/env python2
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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
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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
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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: 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
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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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607cfc79e40f plugin XEP-0380: register namespace
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52 host.registerNamespace(u"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[u'xml']
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56 encryption_elt = message_elt.addElement((NS_EME, u'encryption'))
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57 encryption_elt[u'namespace'] = namespace
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58 if name is not None:
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59 encryption_elt[u'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[u'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, u'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(u"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[u'from']
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90 to_jid = jid.JID(message_elt[u'from'])
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91 algorithm = u"{} [{}]".format(name, namespace) if name else namespace
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92 log.warning(
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93 _(u"Message from {sender} is encrypted with {algorithm} and we can't "
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94 u"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 u"User {sender} sent you an encrypted message (encrypted with {algorithm}), "
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98 u"and we can't decrypt it.").format(sender=sender_s, algorithm=algorithm)
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99
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3bea6b5ae972 plugin XEP-0380, XEP-0384: use C.EXTRA_INFO_DECR_ERR as info sub-type when a message can't be decrypted.
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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