From 4eaf3eb840b8cfa78d970216c74fc128495f08a5 Mon Sep 17 00:00:00 2001 From: Hugh Nimmo-Smith Date: Tue, 18 Oct 2022 16:52:25 +0100 Subject: [PATCH] Implementation of HTTP 307 response for MSC3886 POST endpoint (#14018) Co-authored-by: reivilibre Co-authored-by: Andrew Morgan --- changelog.d/14018.feature | 1 + synapse/config/experimental.py | 7 +- synapse/config/server.py | 4 + synapse/handlers/sso.py | 2 +- synapse/http/server.py | 48 +++++++--- synapse/http/site.py | 3 + synapse/rest/__init__.py | 2 + synapse/rest/client/rendezvous.py | 74 +++++++++++++++ synapse/rest/client/versions.py | 3 + synapse/rest/key/v2/local_key_resource.py | 4 +- .../rest/synapse/client/new_user_consent.py | 3 +- synapse/rest/well_known.py | 3 +- tests/logging/test_terse_json.py | 1 + tests/rest/client/test_rendezvous.py | 45 +++++++++ tests/server.py | 8 +- tests/test_server.py | 94 +++++++++++++------ 16 files changed, 257 insertions(+), 45 deletions(-) create mode 100644 changelog.d/14018.feature create mode 100644 synapse/rest/client/rendezvous.py create mode 100644 tests/rest/client/test_rendezvous.py diff --git a/changelog.d/14018.feature b/changelog.d/14018.feature new file mode 100644 index 0000000000..c8454607eb --- /dev/null +++ b/changelog.d/14018.feature @@ -0,0 +1 @@ +Support for redirecting to an implementation of a [MSC3886](https://github.com/matrix-org/matrix-spec-proposals/pull/3886) HTTP rendezvous service. \ No newline at end of file diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py index f9a49451d8..4009add01d 100644 --- a/synapse/config/experimental.py +++ b/synapse/config/experimental.py @@ -12,7 +12,7 @@ # See the License for the specific language governing permissions and # limitations under the License. -from typing import Any +from typing import Any, Optional import attr @@ -120,3 +120,8 @@ class ExperimentalConfig(Config): # MSC3874: Filtering /messages with rel_types / not_rel_types. self.msc3874_enabled: bool = experimental.get("msc3874_enabled", False) + + # MSC3886: Simple client rendezvous capability + self.msc3886_endpoint: Optional[str] = experimental.get( + "msc3886_endpoint", None + ) diff --git a/synapse/config/server.py b/synapse/config/server.py index f2353ce5fb..ec46ca63ad 100644 --- a/synapse/config/server.py +++ b/synapse/config/server.py @@ -207,6 +207,9 @@ class HttpListenerConfig: additional_resources: Dict[str, dict] = attr.Factory(dict) tag: Optional[str] = None request_id_header: Optional[str] = None + # If true, the listener will return CORS response headers compatible with MSC3886: + # https://github.com/matrix-org/matrix-spec-proposals/pull/3886 + experimental_cors_msc3886: bool = False @attr.s(slots=True, frozen=True, auto_attribs=True) @@ -935,6 +938,7 @@ def parse_listener_def(num: int, listener: Any) -> ListenerConfig: additional_resources=listener.get("additional_resources", {}), tag=listener.get("tag"), request_id_header=listener.get("request_id_header"), + experimental_cors_msc3886=listener.get("experimental_cors_msc3886", False), ) return ListenerConfig(port, bind_addresses, listener_type, tls, http_config) diff --git a/synapse/handlers/sso.py b/synapse/handlers/sso.py index e035677b8a..5943f08e91 100644 --- a/synapse/handlers/sso.py +++ b/synapse/handlers/sso.py @@ -874,7 +874,7 @@ class SsoHandler: ) async def handle_terms_accepted( - self, request: Request, session_id: str, terms_version: str + self, request: SynapseRequest, session_id: str, terms_version: str ) -> None: """Handle a request to the new-user 'consent' endpoint diff --git a/synapse/http/server.py b/synapse/http/server.py index bcbfac2c9f..b26e34bceb 100644 --- a/synapse/http/server.py +++ b/synapse/http/server.py @@ -19,6 +19,7 @@ import logging import types import urllib from http import HTTPStatus +from http.client import FOUND from inspect import isawaitable from typing import ( TYPE_CHECKING, @@ -339,7 +340,7 @@ class _AsyncResource(resource.Resource, metaclass=abc.ABCMeta): return callback_return - _unrecognised_request_handler(request) + return _unrecognised_request_handler(request) @abc.abstractmethod def _send_response( @@ -598,7 +599,7 @@ class RootRedirect(resource.Resource): class OptionsResource(resource.Resource): """Responds to OPTION requests for itself and all children.""" - def render_OPTIONS(self, request: Request) -> bytes: + def render_OPTIONS(self, request: SynapseRequest) -> bytes: request.setResponseCode(204) request.setHeader(b"Content-Length", b"0") @@ -763,7 +764,7 @@ def respond_with_json( def respond_with_json_bytes( - request: Request, + request: SynapseRequest, code: int, json_bytes: bytes, send_cors: bool = False, @@ -859,7 +860,7 @@ def _write_bytes_to_request(request: Request, bytes_to_write: bytes) -> None: _ByteProducer(request, bytes_generator) -def set_cors_headers(request: Request) -> None: +def set_cors_headers(request: SynapseRequest) -> None: """Set the CORS headers so that javascript running in a web browsers can use this API @@ -870,10 +871,20 @@ def set_cors_headers(request: Request) -> None: request.setHeader( b"Access-Control-Allow-Methods", b"GET, HEAD, POST, PUT, DELETE, OPTIONS" ) - request.setHeader( - b"Access-Control-Allow-Headers", - b"X-Requested-With, Content-Type, Authorization, Date", - ) + if request.experimental_cors_msc3886: + request.setHeader( + b"Access-Control-Allow-Headers", + b"X-Requested-With, Content-Type, Authorization, Date, If-Match, If-None-Match", + ) + request.setHeader( + b"Access-Control-Expose-Headers", + b"ETag, Location, X-Max-Bytes", + ) + else: + request.setHeader( + b"Access-Control-Allow-Headers", + b"X-Requested-With, Content-Type, Authorization, Date", + ) def set_corp_headers(request: Request) -> None: @@ -942,10 +953,25 @@ def set_clickjacking_protection_headers(request: Request) -> None: request.setHeader(b"Content-Security-Policy", b"frame-ancestors 'none';") -def respond_with_redirect(request: Request, url: bytes) -> None: - """Write a 302 response to the request, if it is still alive.""" +def respond_with_redirect( + request: SynapseRequest, url: bytes, statusCode: int = FOUND, cors: bool = False +) -> None: + """ + Write a 302 (or other specified status code) response to the request, if it is still alive. + + Args: + request: The http request to respond to. + url: The URL to redirect to. + statusCode: The HTTP status code to use for the redirect (defaults to 302). + cors: Whether to set CORS headers on the response. + """ logger.debug("Redirect to %s", url.decode("utf-8")) - request.redirect(url) + + if cors: + set_cors_headers(request) + + request.setResponseCode(statusCode) + request.setHeader(b"location", url) finish_request(request) diff --git a/synapse/http/site.py b/synapse/http/site.py index 55a6afce35..3dbd541fed 100644 --- a/synapse/http/site.py +++ b/synapse/http/site.py @@ -82,6 +82,7 @@ class SynapseRequest(Request): self.reactor = site.reactor self._channel = channel # this is used by the tests self.start_time = 0.0 + self.experimental_cors_msc3886 = site.experimental_cors_msc3886 # The requester, if authenticated. For federation requests this is the # server name, for client requests this is the Requester object. @@ -622,6 +623,8 @@ class SynapseSite(Site): request_id_header = config.http_options.request_id_header + self.experimental_cors_msc3886 = config.http_options.experimental_cors_msc3886 + def request_factory(channel: HTTPChannel, queued: bool) -> Request: return request_class( channel, diff --git a/synapse/rest/__init__.py b/synapse/rest/__init__.py index 9a2ab99ede..28542cd774 100644 --- a/synapse/rest/__init__.py +++ b/synapse/rest/__init__.py @@ -44,6 +44,7 @@ from synapse.rest.client import ( receipts, register, relations, + rendezvous, report_event, room, room_batch, @@ -132,3 +133,4 @@ class ClientRestResource(JsonResource): # unstable mutual_rooms.register_servlets(hs, client_resource) login_token_request.register_servlets(hs, client_resource) + rendezvous.register_servlets(hs, client_resource) diff --git a/synapse/rest/client/rendezvous.py b/synapse/rest/client/rendezvous.py new file mode 100644 index 0000000000..89176b1ffa --- /dev/null +++ b/synapse/rest/client/rendezvous.py @@ -0,0 +1,74 @@ +# Copyright 2022 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 +from http.client import TEMPORARY_REDIRECT +from typing import TYPE_CHECKING, Optional + +from synapse.http.server import HttpServer, respond_with_redirect +from synapse.http.servlet import RestServlet +from synapse.http.site import SynapseRequest +from synapse.rest.client._base import client_patterns + +if TYPE_CHECKING: + from synapse.server import HomeServer + +logger = logging.getLogger(__name__) + + +class RendezvousServlet(RestServlet): + """ + This is a placeholder implementation of [MSC3886](https://github.com/matrix-org/matrix-spec-proposals/pull/3886) + simple client rendezvous capability that is used by the "Sign in with QR" functionality. + + This implementation only serves as a 307 redirect to a configured server rather than being a full implementation. + + A module that implements the full functionality is available at: https://pypi.org/project/matrix-http-rendezvous-synapse/. + + Request: + + POST /rendezvous HTTP/1.1 + Content-Type: ... + + ... + + Response: + + HTTP/1.1 307 + Location: + """ + + PATTERNS = client_patterns( + "/org.matrix.msc3886/rendezvous$", releases=[], v1=False, unstable=True + ) + + def __init__(self, hs: "HomeServer"): + super().__init__() + redirection_target: Optional[str] = hs.config.experimental.msc3886_endpoint + assert ( + redirection_target is not None + ), "Servlet is only registered if there is a redirection target" + self.endpoint = redirection_target.encode("utf-8") + + async def on_POST(self, request: SynapseRequest) -> None: + respond_with_redirect( + request, self.endpoint, statusCode=TEMPORARY_REDIRECT, cors=True + ) + + # PUT, GET and DELETE are not implemented as they should be fulfilled by the redirect target. + + +def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None: + if hs.config.experimental.msc3886_endpoint is not None: + RendezvousServlet(hs).register(http_server) diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py index 4b87ee978a..9b1b72c68a 100644 --- a/synapse/rest/client/versions.py +++ b/synapse/rest/client/versions.py @@ -116,6 +116,9 @@ class VersionsRestServlet(RestServlet): "org.matrix.msc3881": self.config.experimental.msc3881_enabled, # Adds support for filtering /messages by event relation. "org.matrix.msc3874": self.config.experimental.msc3874_enabled, + # Adds support for simple HTTP rendezvous as per MSC3886 + "org.matrix.msc3886": self.config.experimental.msc3886_endpoint + is not None, }, }, ) diff --git a/synapse/rest/key/v2/local_key_resource.py b/synapse/rest/key/v2/local_key_resource.py index 0c9f042c84..095993415c 100644 --- a/synapse/rest/key/v2/local_key_resource.py +++ b/synapse/rest/key/v2/local_key_resource.py @@ -20,9 +20,9 @@ from signedjson.sign import sign_json from unpaddedbase64 import encode_base64 from twisted.web.resource import Resource -from twisted.web.server import Request from synapse.http.server import respond_with_json_bytes +from synapse.http.site import SynapseRequest from synapse.types import JsonDict if TYPE_CHECKING: @@ -99,7 +99,7 @@ class LocalKey(Resource): json_object = sign_json(json_object, self.config.server.server_name, key) return json_object - def render_GET(self, request: Request) -> Optional[int]: + def render_GET(self, request: SynapseRequest) -> Optional[int]: time_now = self.clock.time_msec() # Update the expiry time if less than half the interval remains. if time_now + self.config.key.key_refresh_interval / 2 > self.valid_until_ts: diff --git a/synapse/rest/synapse/client/new_user_consent.py b/synapse/rest/synapse/client/new_user_consent.py index 1c1c7b3613..22784157e6 100644 --- a/synapse/rest/synapse/client/new_user_consent.py +++ b/synapse/rest/synapse/client/new_user_consent.py @@ -20,6 +20,7 @@ from synapse.api.errors import SynapseError from synapse.handlers.sso import get_username_mapping_session_cookie_from_request from synapse.http.server import DirectServeHtmlResource, respond_with_html from synapse.http.servlet import parse_string +from synapse.http.site import SynapseRequest from synapse.types import UserID from synapse.util.templates import build_jinja_env @@ -88,7 +89,7 @@ class NewUserConsentResource(DirectServeHtmlResource): html = template.render(template_params) respond_with_html(request, 200, html) - async def _async_render_POST(self, request: Request) -> None: + async def _async_render_POST(self, request: SynapseRequest) -> None: try: session_id = get_username_mapping_session_cookie_from_request(request) except SynapseError as e: diff --git a/synapse/rest/well_known.py b/synapse/rest/well_known.py index 6f7ac54c65..e2174fdfea 100644 --- a/synapse/rest/well_known.py +++ b/synapse/rest/well_known.py @@ -18,6 +18,7 @@ from twisted.web.resource import Resource from twisted.web.server import Request from synapse.http.server import set_cors_headers +from synapse.http.site import SynapseRequest from synapse.types import JsonDict from synapse.util import json_encoder from synapse.util.stringutils import parse_server_name @@ -63,7 +64,7 @@ class ClientWellKnownResource(Resource): Resource.__init__(self) self._well_known_builder = WellKnownBuilder(hs) - def render_GET(self, request: Request) -> bytes: + def render_GET(self, request: SynapseRequest) -> bytes: set_cors_headers(request) r = self._well_known_builder.get_well_known() if not r: diff --git a/tests/logging/test_terse_json.py b/tests/logging/test_terse_json.py index 96f399b7ab..0b0d8737c1 100644 --- a/tests/logging/test_terse_json.py +++ b/tests/logging/test_terse_json.py @@ -153,6 +153,7 @@ class TerseJsonTestCase(LoggerCleanupMixin, TestCase): site.site_tag = "test-site" site.server_version_string = "Server v1" site.reactor = Mock() + site.experimental_cors_msc3886 = False request = SynapseRequest(FakeChannel(site, None), site) # Call requestReceived to finish instantiating the object. request.content = BytesIO() diff --git a/tests/rest/client/test_rendezvous.py b/tests/rest/client/test_rendezvous.py new file mode 100644 index 0000000000..ad00a476e1 --- /dev/null +++ b/tests/rest/client/test_rendezvous.py @@ -0,0 +1,45 @@ +# Copyright 2022 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 twisted.test.proto_helpers import MemoryReactor + +from synapse.rest.client import rendezvous +from synapse.server import HomeServer +from synapse.util import Clock + +from tests import unittest +from tests.unittest import override_config + +endpoint = "/_matrix/client/unstable/org.matrix.msc3886/rendezvous" + + +class RendezvousServletTestCase(unittest.HomeserverTestCase): + + servlets = [ + rendezvous.register_servlets, + ] + + def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer: + self.hs = self.setup_test_homeserver() + return self.hs + + def test_disabled(self) -> None: + channel = self.make_request("POST", endpoint, {}, access_token=None) + self.assertEqual(channel.code, 400) + + @override_config({"experimental_features": {"msc3886_endpoint": "/asd"}}) + def test_redirect(self) -> None: + channel = self.make_request("POST", endpoint, {}, access_token=None) + self.assertEqual(channel.code, 307) + self.assertEqual(channel.headers.getRawHeaders("Location"), ["/asd"]) diff --git a/tests/server.py b/tests/server.py index c447d5e4c4..8b1d186219 100644 --- a/tests/server.py +++ b/tests/server.py @@ -266,7 +266,12 @@ class FakeSite: site_tag = "test" access_logger = logging.getLogger("synapse.access.http.fake") - def __init__(self, resource: IResource, reactor: IReactorTime): + def __init__( + self, + resource: IResource, + reactor: IReactorTime, + experimental_cors_msc3886: bool = False, + ): """ Args: @@ -274,6 +279,7 @@ class FakeSite: """ self._resource = resource self.reactor = reactor + self.experimental_cors_msc3886 = experimental_cors_msc3886 def getResourceFor(self, request): return self._resource diff --git a/tests/test_server.py b/tests/test_server.py index 7c66448245..2d9a0257d4 100644 --- a/tests/test_server.py +++ b/tests/test_server.py @@ -222,13 +222,22 @@ class OptionsResourceTests(unittest.TestCase): self.resource = OptionsResource() self.resource.putChild(b"res", DummyResource()) - def _make_request(self, method: bytes, path: bytes) -> FakeChannel: + def _make_request( + self, method: bytes, path: bytes, experimental_cors_msc3886: bool = False + ) -> FakeChannel: """Create a request from the method/path and return a channel with the response.""" # Create a site and query for the resource. site = SynapseSite( "test", "site_tag", - parse_listener_def(0, {"type": "http", "port": 0}), + parse_listener_def( + 0, + { + "type": "http", + "port": 0, + "experimental_cors_msc3886": experimental_cors_msc3886, + }, + ), self.resource, "1.0", max_request_body_size=4096, @@ -239,25 +248,58 @@ class OptionsResourceTests(unittest.TestCase): channel = make_request(self.reactor, site, method, path, shorthand=False) return channel + def _check_cors_standard_headers(self, channel: FakeChannel) -> None: + # Ensure the correct CORS headers have been added + # as per https://spec.matrix.org/v1.4/client-server-api/#web-browser-clients + self.assertEqual( + channel.headers.getRawHeaders(b"Access-Control-Allow-Origin"), + [b"*"], + "has correct CORS Origin header", + ) + self.assertEqual( + channel.headers.getRawHeaders(b"Access-Control-Allow-Methods"), + [b"GET, HEAD, POST, PUT, DELETE, OPTIONS"], # HEAD isn't in the spec + "has correct CORS Methods header", + ) + self.assertEqual( + channel.headers.getRawHeaders(b"Access-Control-Allow-Headers"), + [b"X-Requested-With, Content-Type, Authorization, Date"], + "has correct CORS Headers header", + ) + + def _check_cors_msc3886_headers(self, channel: FakeChannel) -> None: + # Ensure the correct CORS headers have been added + # as per https://github.com/matrix-org/matrix-spec-proposals/blob/hughns/simple-rendezvous-capability/proposals/3886-simple-rendezvous-capability.md#cors + self.assertEqual( + channel.headers.getRawHeaders(b"Access-Control-Allow-Origin"), + [b"*"], + "has correct CORS Origin header", + ) + self.assertEqual( + channel.headers.getRawHeaders(b"Access-Control-Allow-Methods"), + [b"GET, HEAD, POST, PUT, DELETE, OPTIONS"], # HEAD isn't in the spec + "has correct CORS Methods header", + ) + self.assertEqual( + channel.headers.getRawHeaders(b"Access-Control-Allow-Headers"), + [ + b"X-Requested-With, Content-Type, Authorization, Date, If-Match, If-None-Match" + ], + "has correct CORS Headers header", + ) + self.assertEqual( + channel.headers.getRawHeaders(b"Access-Control-Expose-Headers"), + [b"ETag, Location, X-Max-Bytes"], + "has correct CORS Expose Headers header", + ) + def test_unknown_options_request(self) -> None: """An OPTIONS requests to an unknown URL still returns 204 No Content.""" channel = self._make_request(b"OPTIONS", b"/foo/") self.assertEqual(channel.code, 204) self.assertNotIn("body", channel.result) - # Ensure the correct CORS headers have been added - self.assertTrue( - channel.headers.hasHeader(b"Access-Control-Allow-Origin"), - "has CORS Origin header", - ) - self.assertTrue( - channel.headers.hasHeader(b"Access-Control-Allow-Methods"), - "has CORS Methods header", - ) - self.assertTrue( - channel.headers.hasHeader(b"Access-Control-Allow-Headers"), - "has CORS Headers header", - ) + self._check_cors_standard_headers(channel) def test_known_options_request(self) -> None: """An OPTIONS requests to an known URL still returns 204 No Content.""" @@ -265,19 +307,17 @@ class OptionsResourceTests(unittest.TestCase): self.assertEqual(channel.code, 204) self.assertNotIn("body", channel.result) - # Ensure the correct CORS headers have been added - self.assertTrue( - channel.headers.hasHeader(b"Access-Control-Allow-Origin"), - "has CORS Origin header", - ) - self.assertTrue( - channel.headers.hasHeader(b"Access-Control-Allow-Methods"), - "has CORS Methods header", - ) - self.assertTrue( - channel.headers.hasHeader(b"Access-Control-Allow-Headers"), - "has CORS Headers header", + self._check_cors_standard_headers(channel) + + def test_known_options_request_msc3886(self) -> None: + """An OPTIONS requests to an known URL still returns 204 No Content.""" + channel = self._make_request( + b"OPTIONS", b"/res/", experimental_cors_msc3886=True ) + self.assertEqual(channel.code, 204) + self.assertNotIn("body", channel.result) + + self._check_cors_msc3886_headers(channel) def test_unknown_request(self) -> None: """A non-OPTIONS request to an unknown URL should 404."""