Mercurial > libervia-backend
view sat/plugins/plugin_xep_0380.py @ 3405:ecdb3728749e
plugin XEP-0353: Jingle Message Initiation implementation:
This plugin uses the new `XEP-0166_initiate` trigger to initiate a Jingle session with
messages if the peer jid has no resource specified.
On reception, if the sender is not in our roster, a confirmation is requested to user to
avoid leaking presence and IP. If user refuses the session for somebody not in roster,
nothing is sent at all (the request is just ignored).
author | Goffi <goffi@goffi.org> |
---|---|
date | Thu, 12 Nov 2020 14:53:15 +0100 |
parents | dcebc585c29f |
children | be6d91572633 |
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#!/usr/bin/env python3 # SAT plugin for Explicit Message Encryption # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. from sat.core.i18n import _, D_ from sat.core.constants import Const as C from sat.core.log import getLogger from twisted.words.protocols.jabber import jid log = getLogger(__name__) PLUGIN_INFO = { C.PI_NAME: "Explicit Message Encryption", C.PI_IMPORT_NAME: "XEP-0380", C.PI_TYPE: "SEC", C.PI_PROTOCOLS: ["XEP-0380"], C.PI_DEPENDENCIES: [], C.PI_MAIN: "XEP_0380", C.PI_HANDLER: "no", C.PI_DESCRIPTION: _("""Implementation of Explicit Message Encryption"""), } NS_EME = "urn:xmpp:eme:0" KNOWN_NAMESPACES = { "urn:xmpp:otr:0": "OTR", "jabber:x:encrypted": "Legacy OpenPGP", "urn:xmpp:openpgp:0": "OpenPGP for XMPP", } class XEP_0380(object): def __init__(self, host): self.host = host host.trigger.add("sendMessage", self._sendMessageTrigger) host.trigger.add("messageReceived", self._messageReceivedTrigger, priority=100) host.registerNamespace("eme", NS_EME) def _addEMEElement(self, mess_data, namespace, name): message_elt = mess_data['xml'] encryption_elt = message_elt.addElement((NS_EME, 'encryption')) encryption_elt['namespace'] = namespace if name is not None: encryption_elt['name'] = name return mess_data def _sendMessageTrigger(self, client, mess_data, __, post_xml_treatments): encryption = mess_data.get(C.MESS_KEY_ENCRYPTION) if encryption is not None: namespace = encryption['plugin'].namespace if namespace not in KNOWN_NAMESPACES: name = encryption['plugin'].name else: name = None post_xml_treatments.addCallback( self._addEMEElement, namespace=namespace, name=name) return True def _messageReceivedTrigger(self, client, message_elt, post_treat): try: encryption_elt = next(message_elt.elements(NS_EME, 'encryption')) except StopIteration: return True namespace = encryption_elt['namespace'] if namespace in client.encryption.getNamespaces(): # message is encrypted and we can decrypt it return True name = KNOWN_NAMESPACES.get(namespace, encryption_elt.getAttribute("name")) # at this point, message is encrypted but we know that we can't decrypt it, # we need to notify the user sender_s = message_elt['from'] to_jid = jid.JID(message_elt['from']) algorithm = "{} [{}]".format(name, namespace) if name else namespace log.warning( _("Message from {sender} is encrypted with {algorithm} and we can't " "decrypt it.".format(sender=message_elt['from'], algorithm=algorithm))) user_msg = D_( "User {sender} sent you an encrypted message (encrypted with {algorithm}), " "and we can't decrypt it.").format(sender=sender_s, algorithm=algorithm) extra = {C.MESS_EXTRA_INFO: C.EXTRA_INFO_DECR_ERR} client.feedback(to_jid, user_msg, extra) return False