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c7401a697f
This implements both a SAML2 metadata endpoint (at `/_matrix/saml2/metadata.xml`), and a SAML2 response receiver (at `/_matrix/saml2/authn_response`). If the SAML2 response matches what's been configured, we complete the SSO login flow by redirecting to the client url (aka `RelayState` in SAML2 jargon) with a login token. What we don't yet have is anything to build a SAML2 request and redirect the user to the identity provider. That is left as an exercise for the reader.
72 lines
2.3 KiB
Python
72 lines
2.3 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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import saml2
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from saml2.client import Saml2Client
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from twisted.web.resource import Resource
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from twisted.web.server import NOT_DONE_YET
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from synapse.api.errors import CodeMessageException
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from synapse.http.server import wrap_html_request_handler
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from synapse.http.servlet import parse_string
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from synapse.rest.client.v1.login import SSOAuthHandler
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logger = logging.getLogger(__name__)
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class SAML2ResponseResource(Resource):
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"""A Twisted web resource which handles the SAML response"""
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isLeaf = 1
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def __init__(self, hs):
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Resource.__init__(self)
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self._saml_client = Saml2Client(hs.config.saml2_sp_config)
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self._sso_auth_handler = SSOAuthHandler(hs)
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def render_POST(self, request):
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self._async_render_POST(request)
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return NOT_DONE_YET
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@wrap_html_request_handler
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def _async_render_POST(self, request):
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resp_bytes = parse_string(request, 'SAMLResponse', required=True)
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relay_state = parse_string(request, 'RelayState', required=True)
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try:
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saml2_auth = self._saml_client.parse_authn_request_response(
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resp_bytes, saml2.BINDING_HTTP_POST,
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)
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except Exception as e:
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logger.warning("Exception parsing SAML2 response", exc_info=1)
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raise CodeMessageException(
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400, "Unable to parse SAML2 response: %s" % (e,),
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)
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if saml2_auth.not_signed:
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raise CodeMessageException(400, "SAML2 response was not signed")
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if "uid" not in saml2_auth.ava:
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raise CodeMessageException(400, "uid not in SAML2 response")
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username = saml2_auth.ava["uid"][0]
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return self._sso_auth_handler.on_successful_auth(
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username, request, relay_state,
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)
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