Workaround for error when fetching notary's own key (#6620)

* Kill off redundant SynapseRequestFactory

We already get the Site via the Channel, so there's no need for a dedicated
RequestFactory: we can just use the right constructor.

* Workaround for error when fetching notary's own key

As a notary server, when we return our own keys, include all of our signing
keys in verify_keys.

This is a workaround for #6596.
This commit is contained in:
Richard van der Hoff 2020-01-06 12:28:58 +00:00 committed by GitHub
parent 01c3c6c929
commit 18674eebb1
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 163 additions and 9 deletions

1
changelog.d/6620.misc Normal file
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@ -0,0 +1 @@
Add a workaround for synapse raising exceptions when fetching the notary's own key from the notary.

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@ -15,6 +15,7 @@
import logging
from canonicaljson import encode_canonical_json, json
from signedjson.key import encode_verify_key_base64
from signedjson.sign import sign_json
from twisted.internet import defer
@ -216,15 +217,28 @@ class RemoteKey(DirectServeResource):
if cache_misses and query_remote_on_cache_miss:
yield self.fetcher.get_keys(cache_misses)
yield self.query_keys(request, query, query_remote_on_cache_miss=False)
else:
signed_keys = []
for key_json in json_results:
key_json = json.loads(key_json)
return
signed_keys = []
for key_json in json_results:
key_json = json.loads(key_json)
# backwards-compatibility hack for #6596: if the requested key belongs
# to us, make sure that all of the signing keys appear in the
# "verify_keys" section.
if key_json["server_name"] == self.config.server_name:
verify_keys = key_json["verify_keys"]
for signing_key in self.config.key_server_signing_keys:
key_json = sign_json(key_json, self.config.server_name, signing_key)
key_id = "%s:%s" % (signing_key.alg, signing_key.version)
verify_keys[key_id] = {
"key": encode_verify_key_base64(signing_key.verify_key)
}
signed_keys.append(key_json)
for signing_key in self.config.key_server_signing_keys:
key_json = sign_json(key_json, self.config.server_name, signing_key)
results = {"server_keys": signed_keys}
signed_keys.append(key_json)
respond_with_json_bytes(request, 200, encode_canonical_json(results))
results = {"server_keys": signed_keys}
respond_with_json_bytes(request, 200, encode_canonical_json(results))

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@ -0,0 +1,130 @@
# -*- coding: utf-8 -*-
# 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.
import urllib.parse
from io import BytesIO
from mock import Mock
import signedjson.key
from nacl.signing import SigningKey
from signedjson.sign import sign_json
from twisted.web.resource import NoResource
from synapse.http.site import SynapseRequest
from synapse.rest.key.v2 import KeyApiV2Resource
from synapse.util.httpresourcetree import create_resource_tree
from tests import unittest
from tests.server import FakeChannel, wait_until_result
class RemoteKeyResourceTestCase(unittest.HomeserverTestCase):
def make_homeserver(self, reactor, clock):
self.http_client = Mock()
return self.setup_test_homeserver(http_client=self.http_client)
def create_test_json_resource(self):
return create_resource_tree(
{"/_matrix/key/v2": KeyApiV2Resource(self.hs)}, root_resource=NoResource()
)
def expect_outgoing_key_request(
self, server_name: str, signing_key: SigningKey
) -> None:
"""
Tell the mock http client to expect an outgoing GET request for the given key
"""
def get_json(destination, path, ignore_backoff=False, **kwargs):
self.assertTrue(ignore_backoff)
self.assertEqual(destination, server_name)
key_id = "%s:%s" % (signing_key.alg, signing_key.version)
self.assertEqual(
path, "/_matrix/key/v2/server/%s" % (urllib.parse.quote(key_id),)
)
response = {
"server_name": server_name,
"old_verify_keys": {},
"valid_until_ts": 200 * 1000,
"verify_keys": {
key_id: {
"key": signedjson.key.encode_verify_key_base64(
signing_key.verify_key
)
}
},
}
sign_json(response, server_name, signing_key)
return response
self.http_client.get_json.side_effect = get_json
def make_notary_request(self, server_name: str, key_id: str) -> dict:
"""Send a GET request to the test server requesting the given key.
Checks that the response is a 200 and returns the decoded json body.
"""
channel = FakeChannel(self.site, self.reactor)
req = SynapseRequest(channel)
req.content = BytesIO(b"")
req.requestReceived(
b"GET",
b"/_matrix/key/v2/query/%s/%s"
% (server_name.encode("utf-8"), key_id.encode("utf-8")),
b"1.1",
)
wait_until_result(self.reactor, req)
self.assertEqual(channel.code, 200)
resp = channel.json_body
return resp
def test_get_key(self):
"""Fetch a remote key"""
SERVER_NAME = "remote.server"
testkey = signedjson.key.generate_signing_key("ver1")
self.expect_outgoing_key_request(SERVER_NAME, testkey)
resp = self.make_notary_request(SERVER_NAME, "ed25519:ver1")
keys = resp["server_keys"]
self.assertEqual(len(keys), 1)
self.assertIn("ed25519:ver1", keys[0]["verify_keys"])
self.assertEqual(len(keys[0]["verify_keys"]), 1)
# it should be signed by both the origin server and the notary
self.assertIn(SERVER_NAME, keys[0]["signatures"])
self.assertIn(self.hs.hostname, keys[0]["signatures"])
def test_get_own_key(self):
"""Fetch our own key"""
testkey = signedjson.key.generate_signing_key("ver1")
self.expect_outgoing_key_request(self.hs.hostname, testkey)
resp = self.make_notary_request(self.hs.hostname, "ed25519:ver1")
keys = resp["server_keys"]
self.assertEqual(len(keys), 1)
# it should be signed by both itself, and the notary signing key
sigs = keys[0]["signatures"]
self.assertEqual(len(sigs), 1)
self.assertIn(self.hs.hostname, sigs)
oursigs = sigs[self.hs.hostname]
self.assertEqual(len(oursigs), 2)
# and both keys should be present in the verify_keys section
self.assertIn("ed25519:ver1", keys[0]["verify_keys"])
self.assertIn("ed25519:a_lPym", keys[0]["verify_keys"])

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@ -36,7 +36,7 @@ from synapse.config.homeserver import HomeServerConfig
from synapse.config.ratelimiting import FederationRateLimitConfig
from synapse.federation.transport import server as federation_server
from synapse.http.server import JsonResource
from synapse.http.site import SynapseRequest
from synapse.http.site import SynapseRequest, SynapseSite
from synapse.logging.context import LoggingContext
from synapse.server import HomeServer
from synapse.types import Requester, UserID, create_requester
@ -210,6 +210,15 @@ class HomeserverTestCase(TestCase):
# Register the resources
self.resource = self.create_test_json_resource()
# create a site to wrap the resource.
self.site = SynapseSite(
logger_name="synapse.access.http.fake",
site_tag="test",
config={},
resource=self.resource,
server_version_string="1",
)
from tests.rest.client.v1.utils import RestHelper
self.helper = RestHelper(self.hs, self.resource, getattr(self, "user_id", None))