refactoring: renamed sat package to libervia.backend
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Goffi
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1 changed files with 1293 additions and 1293 deletions
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#!/usr/bin/env python3
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# Libervia plugin for Pubsub Targeted Encryption
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# Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from typing import Any, Dict, List, Optional
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from twisted.internet import defer
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from twisted.words.protocols.jabber import jid, xmlstream
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from twisted.words.xish import domish
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from wokkel import disco, iwokkel
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from wokkel import rsm
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from zope.interface import implementer
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from sat.core import exceptions
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from sat.core.constants import Const as C
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from sat.core.core_types import SatXMPPEntity
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from sat.core.i18n import _
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from sat.core.log import getLogger
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log = getLogger(__name__)
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IMPORT_NAME = "PTE"
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PLUGIN_INFO = {
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C.PI_NAME: "Pubsub Targeted Encryption",
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C.PI_IMPORT_NAME: IMPORT_NAME,
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C.PI_TYPE: C.PLUG_TYPE_XEP,
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C.PI_MODES: C.PLUG_MODE_BOTH,
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C.PI_PROTOCOLS: [],
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C.PI_DEPENDENCIES: ["XEP-0060", "XEP-0384"],
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C.PI_MAIN: "PTE",
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C.PI_HANDLER: "yes",
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C.PI_DESCRIPTION: _("""Encrypt some items to specific entities"""),
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}
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NS_PTE = "urn:xmpp:pte:0"
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class PTE:
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namespace = NS_PTE
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def __init__(self, host):
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log.info(_("Pubsub Targeted Encryption plugin initialization"))
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host.register_namespace("pte", NS_PTE)
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self.host = host
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self._o = host.plugins["XEP-0384"]
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host.trigger.add("XEP-0060_publish", self._publish_trigger)
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host.trigger.add("XEP-0060_items", self._items_trigger)
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def get_handler(self, client):
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return PTE_Handler()
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async def _publish_trigger(
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self,
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client: SatXMPPEntity,
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service: jid.JID,
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node: str,
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items: Optional[List[domish.Element]],
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options: Optional[dict],
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sender: jid.JID,
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extra: Dict[str, Any]
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) -> bool:
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if not items or extra.get("encrypted_for") is None:
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return True
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encrypt_data = extra["encrypted_for"]
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try:
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targets = {jid.JID(t) for t in encrypt_data["targets"]}
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except (KeyError, RuntimeError):
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raise exceptions.DataError(f"Invalid encryption data: {encrypt_data}")
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for item in items:
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log.debug(
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f"encrypting item {item.getAttribute('id', '')} for "
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f"{', '.join(t.full() for t in targets)}"
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)
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encryption_type = encrypt_data.get("type", self._o.NS_TWOMEMO)
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if encryption_type != self._o.NS_TWOMEMO:
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raise NotImplementedError("only TWOMEMO is supported for now")
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await self._o.encrypt(
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client,
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self._o.NS_TWOMEMO,
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item,
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targets,
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is_muc_message=False,
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stanza_id=None
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)
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item_elts = list(item.elements())
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if len(item_elts) != 1:
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raise ValueError(
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f"there should be exactly one item payload: {item.toXml()}"
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)
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encrypted_payload = item_elts[0]
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item.children.clear()
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encrypted_elt = item.addElement((NS_PTE, "encrypted"))
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encrypted_elt["by"] = sender.userhost()
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encrypted_elt["type"] = encryption_type
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encrypted_elt.addChild(encrypted_payload)
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return True
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async def _items_trigger(
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self,
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client: SatXMPPEntity,
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service: Optional[jid.JID],
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node: str,
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items: List[domish.Element],
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rsm_response: rsm.RSMResponse,
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extra: Dict[str, Any],
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) -> bool:
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if not extra.get(C.KEY_DECRYPT, True):
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return True
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if service is None:
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service = client.jid.userhostJID()
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for item in items:
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payload = item.firstChildElement()
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if (payload is not None
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and payload.name == "encrypted"
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and payload.uri == NS_PTE):
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encrypted_elt = payload
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item.children.clear()
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try:
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encryption_type = encrypted_elt.getAttribute("type")
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encrypted_by = jid.JID(encrypted_elt["by"])
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except (KeyError, RuntimeError):
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raise exceptions.DataError(
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f"invalid <encrypted> element: {encrypted_elt.toXml()}"
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)
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if encryption_type!= self._o.NS_TWOMEMO:
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raise NotImplementedError("only TWOMEMO is supported for now")
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log.debug(f"decrypting item {item.getAttribute('id', '')}")
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# FIXME: we do use _message_received_trigger now to decrypt the stanza, a
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# cleaner separated decrypt method should be used
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encrypted_elt["from"] = encrypted_by.full()
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if not await self._o._message_received_trigger(
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client,
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encrypted_elt,
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defer.Deferred()
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) or not encrypted_elt.children:
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raise exceptions.EncryptionError("can't decrypt the message")
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item.addChild(encrypted_elt.firstChildElement())
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extra.setdefault("encrypted", {})[item["id"]] = {
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"type": NS_PTE,
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"algorithm": encryption_type
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}
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return True
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@implementer(iwokkel.IDisco)
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class PTE_Handler(xmlstream.XMPPHandler):
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def getDiscoInfo(self, requestor, service, nodeIdentifier=""):
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return [disco.DiscoFeature(NS_PTE)]
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def getDiscoItems(self, requestor, service, nodeIdentifier=""):
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return []
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