Mercurial > libervia-backend
view libervia/backend/plugins/plugin_sec_pte.py @ 4306:94e0968987cd
plugin XEP-0033: code modernisation, improve delivery, data validation:
- Code has been rewritten using Pydantic models and `async` coroutines for data validation
and cleaner element parsing/generation.
- Delivery has been completely rewritten. It now works even if server doesn't support
multicast, and send to local multicast service first. Delivering to local multicast
service first is due to bad support of XEP-0033 in server (notably Prosody which has an
incomplete implementation), and the current impossibility to detect if a sub-domain
service handles fully multicast or only for local domains. This is a workaround to have
a good balance between backward compatilibity and use of bandwith, and to make it work
with the incoming email gateway implementation (the gateway will only deliver to
entities of its own domain).
- disco feature checking now uses `async` corountines. `host` implementation still use
Deferred return values for compatibility with legacy code.
rel 450
author | Goffi <goffi@goffi.org> |
---|---|
date | Thu, 26 Sep 2024 16:12:01 +0200 |
parents | 0d7bb4df2343 |
children |
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#!/usr/bin/env python3 # Libervia plugin for Pubsub Targeted Encryption # Copyright (C) 2009-2022 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 typing import Any, Dict, List, Optional from twisted.internet import defer from twisted.words.protocols.jabber import jid, xmlstream from twisted.words.xish import domish from wokkel import disco, iwokkel from wokkel import rsm from zope.interface import implementer from libervia.backend.core import exceptions from libervia.backend.core.constants import Const as C from libervia.backend.core.core_types import SatXMPPEntity from libervia.backend.core.i18n import _ from libervia.backend.core.log import getLogger log = getLogger(__name__) IMPORT_NAME = "PTE" PLUGIN_INFO = { C.PI_NAME: "Pubsub Targeted Encryption", C.PI_IMPORT_NAME: IMPORT_NAME, C.PI_TYPE: C.PLUG_TYPE_XEP, C.PI_MODES: C.PLUG_MODE_BOTH, C.PI_PROTOCOLS: [], C.PI_DEPENDENCIES: ["XEP-0060", "XEP-0384"], C.PI_MAIN: "PTE", C.PI_HANDLER: "yes", C.PI_DESCRIPTION: _("""Encrypt some items to specific entities"""), } NS_PTE = "urn:xmpp:pte:0" class PTE: namespace = NS_PTE def __init__(self, host): log.info(_("Pubsub Targeted Encryption plugin initialization")) host.register_namespace("pte", NS_PTE) self.host = host self._o = host.plugins["XEP-0384"] host.trigger.add("XEP-0060_publish", self._publish_trigger) host.trigger.add("XEP-0060_items", self._items_trigger) def get_handler(self, client): return PTE_Handler() async def _publish_trigger( self, client: SatXMPPEntity, service: jid.JID, node: str, items: Optional[List[domish.Element]], options: Optional[dict], sender: jid.JID, extra: Dict[str, Any], ) -> bool: if not items or extra.get("encrypted_for") is None: return True encrypt_data = extra["encrypted_for"] try: targets = {jid.JID(t) for t in encrypt_data["targets"]} except (KeyError, RuntimeError): raise exceptions.DataError(f"Invalid encryption data: {encrypt_data}") for item in items: log.debug( f"encrypting item {item.getAttribute('id', '')} for " f"{', '.join(t.full() for t in targets)}" ) encryption_type = encrypt_data.get("type", self._o.NS_TWOMEMO) if encryption_type != self._o.NS_TWOMEMO: raise NotImplementedError("only TWOMEMO is supported for now") await self._o.encrypt( client, self._o.NS_TWOMEMO, item, targets, is_muc_message=False, stanza_id=None, ) item_elts = list(item.elements()) if len(item_elts) != 1: raise ValueError( f"there should be exactly one item payload: {item.toXml()}" ) encrypted_payload = item_elts[0] item.children.clear() encrypted_elt = item.addElement((NS_PTE, "encrypted")) encrypted_elt["by"] = sender.userhost() encrypted_elt["type"] = encryption_type encrypted_elt.addChild(encrypted_payload) return True async def _items_trigger( self, client: SatXMPPEntity, service: Optional[jid.JID], node: str, items: List[domish.Element], rsm_response: rsm.RSMResponse, extra: Dict[str, Any], ) -> bool: if not extra.get(C.KEY_DECRYPT, True): return True if service is None: service = client.jid.userhostJID() for item in items: payload = item.firstChildElement() if ( payload is not None and payload.name == "encrypted" and payload.uri == NS_PTE ): encrypted_elt = payload item.children.clear() try: encryption_type = encrypted_elt.getAttribute("type") encrypted_by = jid.JID(encrypted_elt["by"]) except (KeyError, RuntimeError): raise exceptions.DataError( f"invalid <encrypted> element: {encrypted_elt.toXml()}" ) if encryption_type != self._o.NS_TWOMEMO: raise NotImplementedError("only TWOMEMO is supported for now") log.debug(f"decrypting item {item.getAttribute('id', '')}") # FIXME: we do use _message_received_trigger now to decrypt the stanza, a # cleaner separated decrypt method should be used encrypted_elt["from"] = encrypted_by.full() if ( not await self._o._message_received_trigger( client, encrypted_elt, defer.Deferred() ) or not encrypted_elt.children ): raise exceptions.EncryptionError("can't decrypt the message") item.addChild(encrypted_elt.firstChildElement()) extra.setdefault("encrypted", {})[item["id"]] = { "type": NS_PTE, "algorithm": encryption_type, } return True @implementer(iwokkel.IDisco) class PTE_Handler(xmlstream.XMPPHandler): def getDiscoInfo(self, requestor, service, nodeIdentifier=""): return [disco.DiscoFeature(NS_PTE)] def getDiscoItems(self, requestor, service, nodeIdentifier=""): return []