Mercurial > libervia-backend
view sat/plugins/plugin_xep_0380.py @ 3219:2ba602aef90e
plugin attach, aesgcm: attachments refactoring:
attachment handling has been simplified, and now use a "register" method similar as the
ones used for download or upload.
A default method (for unencrypted messages) will try a simple upload and will copy the
links to body.
AESGCM plugin has been adapted to be used for encrypted files. If more than one file is
sent with AESGCM plugin, they will be split in several messages as current de-facto
standard (OMEMO media sharing) doesn't support several files per message.
author | Goffi <goffi@goffi.org> |
---|---|
date | Wed, 18 Mar 2020 20:25:02 +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