106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
#!/usr/bin/env python3
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# Libervia plugin
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# Copyright (C) 2009-2023 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 twisted.words.protocols.jabber.xmlstream import XMPPHandler
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from twisted.words.xish import domish
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from wokkel import disco, iwokkel
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from zope.interface import implementer
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from sat.core.constants import Const as C
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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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NS_JINGLE_DTLS = "urn:xmpp:jingle:apps:dtls:0"
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PLUGIN_INFO = {
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C.PI_NAME: "Use of DTLS-SRTP in Jingle Sessions",
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C.PI_IMPORT_NAME: "XEP-0320",
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C.PI_TYPE: "XEP",
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C.PI_MODES: C.PLUG_MODE_BOTH,
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C.PI_PROTOCOLS: ["XEP-0320"],
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C.PI_DEPENDENCIES: ["XEP-0176"],
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C.PI_RECOMMENDATIONS: [],
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C.PI_MAIN: "XEP_0320",
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C.PI_HANDLER: "yes",
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C.PI_DESCRIPTION: _("""Use of DTLS-SRTP with RTP (for e2ee of A/V calls)"""),
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}
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class XEP_0320:
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def __init__(self, host):
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log.info(f"plugin {PLUGIN_INFO[C.PI_NAME]!r} initialization")
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host.trigger.add("XEP-0176_parse_transport", self._parse_transport_trigger)
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host.trigger.add("XEP-0176_build_transport", self._build_transport_trigger)
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def get_handler(self, client):
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return XEP_0320_handler()
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def _parse_transport_trigger(
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self, transport_elt: domish.Element, ice_data: dict
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) -> bool:
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"""Parse the <fingerprint> element"""
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fingerprint_elt = next(
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transport_elt.elements(NS_JINGLE_DTLS, "fingerprint"), None
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)
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if fingerprint_elt is not None:
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try:
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ice_data["fingerprint"] = {
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"hash": fingerprint_elt["hash"],
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"setup": fingerprint_elt["setup"],
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"fingerprint": str(fingerprint_elt),
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}
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except KeyError as e:
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log.warning(
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f"invalid <fingerprint> (attribue {e} is missing): "
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f"{fingerprint_elt.toXml()})"
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)
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return True
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def _build_transport_trigger(
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self, tranport_elt: domish.Element, ice_data: dict
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) -> bool:
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"""Build the <fingerprint> element if possible"""
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try:
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fingerprint_data = ice_data["fingerprint"]
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hash_ = fingerprint_data["hash"]
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setup = fingerprint_data["setup"]
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fingerprint = fingerprint_data["fingerprint"]
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except KeyError:
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pass
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else:
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fingerprint_elt = tranport_elt.addElement(
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(NS_JINGLE_DTLS, "fingerprint"), content=fingerprint
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)
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fingerprint_elt["hash"] = hash_
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fingerprint_elt["setup"] = setup
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return True
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@implementer(iwokkel.IDisco)
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class XEP_0320_handler(XMPPHandler):
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def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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return [disco.DiscoFeature(NS_JINGLE_DTLS)]
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def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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return []
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