mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-10-01 08:25:44 -04:00
a8ac40445c
We want to assign unique mxids to saml users based on an incrementing suffix. For that to work, we need to record the allocated mxid in a separate table.
211 lines
8.1 KiB
Python
211 lines
8.1 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2019 The Matrix.org Foundation C.I.C.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
import logging
|
|
|
|
import attr
|
|
import saml2
|
|
from saml2.client import Saml2Client
|
|
|
|
from synapse.api.errors import SynapseError
|
|
from synapse.http.servlet import parse_string
|
|
from synapse.rest.client.v1.login import SSOAuthHandler
|
|
from synapse.types import UserID, map_username_to_mxid_localpart
|
|
from synapse.util.async_helpers import Linearizer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class SamlHandler:
|
|
def __init__(self, hs):
|
|
self._saml_client = Saml2Client(hs.config.saml2_sp_config)
|
|
self._sso_auth_handler = SSOAuthHandler(hs)
|
|
self._registration_handler = hs.get_registration_handler()
|
|
|
|
self._clock = hs.get_clock()
|
|
self._datastore = hs.get_datastore()
|
|
self._hostname = hs.hostname
|
|
self._saml2_session_lifetime = hs.config.saml2_session_lifetime
|
|
self._mxid_source_attribute = hs.config.saml2_mxid_source_attribute
|
|
self._grandfathered_mxid_source_attribute = (
|
|
hs.config.saml2_grandfathered_mxid_source_attribute
|
|
)
|
|
self._mxid_mapper = hs.config.saml2_mxid_mapper
|
|
|
|
# identifier for the external_ids table
|
|
self._auth_provider_id = "saml"
|
|
|
|
# a map from saml session id to Saml2SessionData object
|
|
self._outstanding_requests_dict = {}
|
|
|
|
# a lock on the mappings
|
|
self._mapping_lock = Linearizer(name="saml_mapping", clock=self._clock)
|
|
|
|
def handle_redirect_request(self, client_redirect_url):
|
|
"""Handle an incoming request to /login/sso/redirect
|
|
|
|
Args:
|
|
client_redirect_url (bytes): the URL that we should redirect the
|
|
client to when everything is done
|
|
|
|
Returns:
|
|
bytes: URL to redirect to
|
|
"""
|
|
reqid, info = self._saml_client.prepare_for_authenticate(
|
|
relay_state=client_redirect_url
|
|
)
|
|
|
|
now = self._clock.time_msec()
|
|
self._outstanding_requests_dict[reqid] = Saml2SessionData(creation_time=now)
|
|
|
|
for key, value in info["headers"]:
|
|
if key == "Location":
|
|
return value
|
|
|
|
# this shouldn't happen!
|
|
raise Exception("prepare_for_authenticate didn't return a Location header")
|
|
|
|
async def handle_saml_response(self, request):
|
|
"""Handle an incoming request to /_matrix/saml2/authn_response
|
|
|
|
Args:
|
|
request (SynapseRequest): the incoming request from the browser. We'll
|
|
respond to it with a redirect.
|
|
|
|
Returns:
|
|
Deferred[none]: Completes once we have handled the request.
|
|
"""
|
|
resp_bytes = parse_string(request, "SAMLResponse", required=True)
|
|
relay_state = parse_string(request, "RelayState", required=True)
|
|
|
|
# expire outstanding sessions before parse_authn_request_response checks
|
|
# the dict.
|
|
self.expire_sessions()
|
|
|
|
user_id = await self._map_saml_response_to_user(resp_bytes)
|
|
self._sso_auth_handler.complete_sso_login(user_id, request, relay_state)
|
|
|
|
async def _map_saml_response_to_user(self, resp_bytes):
|
|
try:
|
|
saml2_auth = self._saml_client.parse_authn_request_response(
|
|
resp_bytes,
|
|
saml2.BINDING_HTTP_POST,
|
|
outstanding=self._outstanding_requests_dict,
|
|
)
|
|
except Exception as e:
|
|
logger.warning("Exception parsing SAML2 response: %s", e)
|
|
raise SynapseError(400, "Unable to parse SAML2 response: %s" % (e,))
|
|
|
|
if saml2_auth.not_signed:
|
|
logger.warning("SAML2 response was not signed")
|
|
raise SynapseError(400, "SAML2 response was not signed")
|
|
|
|
try:
|
|
remote_user_id = saml2_auth.ava["uid"][0]
|
|
except KeyError:
|
|
logger.warning("SAML2 response lacks a 'uid' attestation")
|
|
raise SynapseError(400, "uid not in SAML2 response")
|
|
|
|
try:
|
|
mxid_source = saml2_auth.ava[self._mxid_source_attribute][0]
|
|
except KeyError:
|
|
logger.warning(
|
|
"SAML2 response lacks a '%s' attestation", self._mxid_source_attribute
|
|
)
|
|
raise SynapseError(
|
|
400, "%s not in SAML2 response" % (self._mxid_source_attribute,)
|
|
)
|
|
|
|
self._outstanding_requests_dict.pop(saml2_auth.in_response_to, None)
|
|
|
|
displayName = saml2_auth.ava.get("displayName", [None])[0]
|
|
|
|
with (await self._mapping_lock.queue(self._auth_provider_id)):
|
|
# first of all, check if we already have a mapping for this user
|
|
logger.info(
|
|
"Looking for existing mapping for user %s:%s",
|
|
self._auth_provider_id,
|
|
remote_user_id,
|
|
)
|
|
registered_user_id = await self._datastore.get_user_by_external_id(
|
|
self._auth_provider_id, remote_user_id
|
|
)
|
|
if registered_user_id is not None:
|
|
logger.info("Found existing mapping %s", registered_user_id)
|
|
return registered_user_id
|
|
|
|
# backwards-compatibility hack: see if there is an existing user with a
|
|
# suitable mapping from the uid
|
|
if (
|
|
self._grandfathered_mxid_source_attribute
|
|
and self._grandfathered_mxid_source_attribute in saml2_auth.ava
|
|
):
|
|
attrval = saml2_auth.ava[self._grandfathered_mxid_source_attribute][0]
|
|
user_id = UserID(
|
|
map_username_to_mxid_localpart(attrval), self._hostname
|
|
).to_string()
|
|
logger.info(
|
|
"Looking for existing account based on mapped %s %s",
|
|
self._grandfathered_mxid_source_attribute,
|
|
user_id,
|
|
)
|
|
|
|
users = await self._datastore.get_users_by_id_case_insensitive(user_id)
|
|
if users:
|
|
registered_user_id = list(users.keys())[0]
|
|
logger.info("Grandfathering mapping to %s", registered_user_id)
|
|
await self._datastore.record_user_external_id(
|
|
self._auth_provider_id, remote_user_id, registered_user_id
|
|
)
|
|
return registered_user_id
|
|
|
|
# figure out a new mxid for this user
|
|
base_mxid_localpart = self._mxid_mapper(mxid_source)
|
|
|
|
suffix = 0
|
|
while True:
|
|
localpart = base_mxid_localpart + (str(suffix) if suffix else "")
|
|
if not await self._datastore.get_users_by_id_case_insensitive(
|
|
UserID(localpart, self._hostname).to_string()
|
|
):
|
|
break
|
|
suffix += 1
|
|
logger.info("Allocating mxid for new user with localpart %s", localpart)
|
|
|
|
registered_user_id = await self._registration_handler.register_user(
|
|
localpart=localpart, default_display_name=displayName
|
|
)
|
|
await self._datastore.record_user_external_id(
|
|
self._auth_provider_id, remote_user_id, registered_user_id
|
|
)
|
|
return registered_user_id
|
|
|
|
def expire_sessions(self):
|
|
expire_before = self._clock.time_msec() - self._saml2_session_lifetime
|
|
to_expire = set()
|
|
for reqid, data in self._outstanding_requests_dict.items():
|
|
if data.creation_time < expire_before:
|
|
to_expire.add(reqid)
|
|
for reqid in to_expire:
|
|
logger.debug("Expiring session id %s", reqid)
|
|
del self._outstanding_requests_dict[reqid]
|
|
|
|
|
|
@attr.s
|
|
class Saml2SessionData:
|
|
"""Data we track about SAML2 sessions"""
|
|
|
|
# time the session was created, in milliseconds
|
|
creation_time = attr.ib()
|