synapse/tests/handlers/test_saml.py
Richard van der Hoff 7eb6e39a8f
Record the SSO Auth Provider in the login token (#9510)
This great big stack of commits is a a whole load of hoop-jumping to make it easier to store additional values in login tokens, and then to actually store the SSO Identity Provider in the login token. (Making use of that data will follow in a subsequent PR.)
2021-03-04 14:44:22 +00:00

319 lines
11 KiB
Python

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