365 lines
12 KiB
Python
365 lines
12 KiB
Python
# Copyright 2020 The Matrix.org Foundation C.I.C.
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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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from typing import Any, Dict, Optional
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from unittest.mock import Mock
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import attr
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from twisted.test.proto_helpers import MemoryReactor
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from synapse.api.errors import RedirectException
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from synapse.server import HomeServer
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from synapse.util import Clock
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from tests.test_utils import simple_async_mock
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from tests.unittest import HomeserverTestCase, override_config
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# Check if we have the dependencies to run the tests.
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try:
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import saml2.config
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from saml2.sigver import SigverError
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has_saml2 = True
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# pysaml2 can be installed and imported, but might not be able to find xmlsec1.
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config = saml2.config.SPConfig()
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try:
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config.load({"metadata": {}})
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has_xmlsec1 = True
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except SigverError:
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has_xmlsec1 = False
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except ImportError:
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has_saml2 = False
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has_xmlsec1 = False
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# These are a few constants that are used as config parameters in the tests.
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BASE_URL = "https://synapse/"
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@attr.s
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class FakeAuthnResponse:
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ava = attr.ib(type=dict)
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assertions = attr.ib(type=list, factory=list)
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in_response_to = attr.ib(type=Optional[str], default=None)
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class TestMappingProvider:
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def __init__(self, config, module):
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pass
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@staticmethod
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def parse_config(config):
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return
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@staticmethod
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def get_saml_attributes(config):
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return {"uid"}, {"displayName"}
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def get_remote_user_id(self, saml_response, client_redirect_url):
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return saml_response.ava["uid"]
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def saml_response_to_user_attributes(
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self, saml_response, failures, client_redirect_url
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):
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localpart = saml_response.ava["username"] + (str(failures) if failures else "")
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return {"mxid_localpart": localpart, "displayname": None}
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class TestRedirectMappingProvider(TestMappingProvider):
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def saml_response_to_user_attributes(
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self, saml_response, failures, client_redirect_url
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):
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raise RedirectException(b"https://custom-saml-redirect/")
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class SamlHandlerTestCase(HomeserverTestCase):
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def default_config(self) -> Dict[str, Any]:
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config = super().default_config()
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config["public_baseurl"] = BASE_URL
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saml_config: Dict[str, Any] = {
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"sp_config": {"metadata": {}},
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# Disable grandfathering.
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"grandfathered_mxid_source_attribute": None,
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"user_mapping_provider": {"module": __name__ + ".TestMappingProvider"},
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}
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# Update this config with what's in the default config so that
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# override_config works as expected.
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saml_config.update(config.get("saml2_config", {}))
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config["saml2_config"] = saml_config
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return config
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def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
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hs = self.setup_test_homeserver()
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self.handler = hs.get_saml_handler()
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# Reduce the number of attempts when generating MXIDs.
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sso_handler = hs.get_sso_handler()
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sso_handler._MAP_USERNAME_RETRIES = 3
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return hs
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if not has_saml2:
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skip = "Requires pysaml2"
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elif not has_xmlsec1:
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skip = "Requires xmlsec1"
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def test_map_saml_response_to_user(self) -> None:
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"""Ensure that mapping the SAML response returned from a provider to an MXID works properly."""
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# stub out the auth handler
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auth_handler = self.hs.get_auth_handler()
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auth_handler.complete_sso_login = simple_async_mock()
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# send a mocked-up SAML response to the callback
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saml_response = FakeAuthnResponse({"uid": "test_user", "username": "test_user"})
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request = _mock_request()
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, "redirect_uri")
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)
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# check that the auth handler got called as expected
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auth_handler.complete_sso_login.assert_called_once_with(
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"@test_user:test",
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"saml",
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request,
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"redirect_uri",
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None,
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new_user=True,
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auth_provider_session_id=None,
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)
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@override_config({"saml2_config": {"grandfathered_mxid_source_attribute": "mxid"}})
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def test_map_saml_response_to_existing_user(self) -> None:
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"""Existing users can log in with SAML account."""
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store = self.hs.get_datastores().main
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self.get_success(
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store.register_user(user_id="@test_user:test", password_hash=None)
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)
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# stub out the auth handler
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auth_handler = self.hs.get_auth_handler()
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auth_handler.complete_sso_login = simple_async_mock()
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# Map a user via SSO.
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saml_response = FakeAuthnResponse(
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{"uid": "tester", "mxid": ["test_user"], "username": "test_user"}
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)
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request = _mock_request()
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, "")
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)
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# check that the auth handler got called as expected
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auth_handler.complete_sso_login.assert_called_once_with(
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"@test_user:test",
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"saml",
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request,
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"",
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None,
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new_user=False,
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auth_provider_session_id=None,
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)
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# Subsequent calls should map to the same mxid.
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auth_handler.complete_sso_login.reset_mock()
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, "")
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)
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auth_handler.complete_sso_login.assert_called_once_with(
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"@test_user:test",
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"saml",
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request,
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"",
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None,
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new_user=False,
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auth_provider_session_id=None,
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)
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def test_map_saml_response_to_invalid_localpart(self) -> None:
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"""If the mapping provider generates an invalid localpart it should be rejected."""
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# stub out the auth handler
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auth_handler = self.hs.get_auth_handler()
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auth_handler.complete_sso_login = simple_async_mock()
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# mock out the error renderer too
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sso_handler = self.hs.get_sso_handler()
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sso_handler.render_error = Mock(return_value=None)
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saml_response = FakeAuthnResponse({"uid": "test", "username": "föö"})
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request = _mock_request()
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, ""),
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)
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sso_handler.render_error.assert_called_once_with(
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request, "mapping_error", "localpart is invalid: föö"
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)
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auth_handler.complete_sso_login.assert_not_called()
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def test_map_saml_response_to_user_retries(self) -> None:
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"""The mapping provider can retry generating an MXID if the MXID is already in use."""
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# stub out the auth handler and error renderer
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auth_handler = self.hs.get_auth_handler()
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auth_handler.complete_sso_login = simple_async_mock()
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sso_handler = self.hs.get_sso_handler()
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sso_handler.render_error = Mock(return_value=None)
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# register a user to occupy the first-choice MXID
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store = self.hs.get_datastores().main
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self.get_success(
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store.register_user(user_id="@test_user:test", password_hash=None)
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)
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# send the fake SAML response
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saml_response = FakeAuthnResponse({"uid": "test", "username": "test_user"})
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request = _mock_request()
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, ""),
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)
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# test_user is already taken, so test_user1 gets registered instead.
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auth_handler.complete_sso_login.assert_called_once_with(
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"@test_user1:test",
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"saml",
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request,
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"",
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None,
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new_user=True,
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auth_provider_session_id=None,
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)
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auth_handler.complete_sso_login.reset_mock()
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# Register all of the potential mxids for a particular SAML username.
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self.get_success(
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store.register_user(user_id="@tester:test", password_hash=None)
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)
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for i in range(1, 3):
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self.get_success(
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store.register_user(user_id="@tester%d:test" % i, password_hash=None)
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)
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# Now attempt to map to a username, this will fail since all potential usernames are taken.
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saml_response = FakeAuthnResponse({"uid": "tester", "username": "tester"})
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, ""),
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)
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sso_handler.render_error.assert_called_once_with(
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request,
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"mapping_error",
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"Unable to generate a Matrix ID from the SSO response",
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)
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auth_handler.complete_sso_login.assert_not_called()
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@override_config(
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{
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"saml2_config": {
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"user_mapping_provider": {
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"module": __name__ + ".TestRedirectMappingProvider"
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},
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}
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}
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)
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def test_map_saml_response_redirect(self) -> None:
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"""Test a mapping provider that raises a RedirectException"""
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saml_response = FakeAuthnResponse({"uid": "test", "username": "test_user"})
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request = _mock_request()
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e = self.get_failure(
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self.handler._handle_authn_response(request, saml_response, ""),
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RedirectException,
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)
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self.assertEqual(e.value.location, b"https://custom-saml-redirect/")
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@override_config(
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{
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"saml2_config": {
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"attribute_requirements": [
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{"attribute": "userGroup", "value": "staff"},
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{"attribute": "department", "value": "sales"},
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],
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},
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}
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)
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def test_attribute_requirements(self) -> None:
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"""The required attributes must be met from the SAML response."""
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# stub out the auth handler
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auth_handler = self.hs.get_auth_handler()
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auth_handler.complete_sso_login = simple_async_mock()
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# The response doesn't have the proper userGroup or department.
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saml_response = FakeAuthnResponse({"uid": "test_user", "username": "test_user"})
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request = _mock_request()
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, "redirect_uri")
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)
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auth_handler.complete_sso_login.assert_not_called()
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# The response doesn't have the proper department.
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saml_response = FakeAuthnResponse(
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{"uid": "test_user", "username": "test_user", "userGroup": ["staff"]}
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)
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request = _mock_request()
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, "redirect_uri")
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)
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auth_handler.complete_sso_login.assert_not_called()
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# Add the proper attributes and it should succeed.
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saml_response = FakeAuthnResponse(
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{
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"uid": "test_user",
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"username": "test_user",
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"userGroup": ["staff", "admin"],
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"department": ["sales"],
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}
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)
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request.reset_mock()
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self.get_success(
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self.handler._handle_authn_response(request, saml_response, "redirect_uri")
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)
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# check that the auth handler got called as expected
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auth_handler.complete_sso_login.assert_called_once_with(
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"@test_user:test",
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"saml",
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request,
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"redirect_uri",
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None,
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new_user=True,
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auth_provider_session_id=None,
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)
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def _mock_request():
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"""Returns a mock which will stand in as a SynapseRequest"""
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mock = Mock(
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spec=[
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"finish",
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"getClientIP",
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"getHeader",
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"setHeader",
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"setResponseCode",
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"write",
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]
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)
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# `_disconnected` musn't be another `Mock`, otherwise it will be truthy.
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mock._disconnected = False
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return mock
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