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9fbb20a531
There are a few changes going on here: * We make checking the signature on a key server response optional: if no verify_keys are specified, we trust to TLS to validate the connection. * We change the default config so that it does not require responses to be signed by the old key. * We replace the old 'perspectives' config with 'trusted_key_servers', which is also formatted slightly differently. * We emit a warning to the logs every time we trust a key server response signed by the old key.
549 lines
20 KiB
Python
549 lines
20 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 New Vector Ltd
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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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import time
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from mock import Mock
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import canonicaljson
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import signedjson.key
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import signedjson.sign
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from signedjson.key import encode_verify_key_base64, get_verify_key
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from twisted.internet import defer
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from synapse.api.errors import SynapseError
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from synapse.crypto import keyring
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from synapse.crypto.keyring import PerspectivesKeyFetcher, ServerKeyFetcher
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from synapse.storage.keys import FetchKeyResult
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from synapse.util import logcontext
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from synapse.util.logcontext import LoggingContext
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from tests import unittest
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class MockPerspectiveServer(object):
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def __init__(self):
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self.server_name = "mock_server"
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self.key = signedjson.key.generate_signing_key(0)
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def get_verify_keys(self):
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vk = signedjson.key.get_verify_key(self.key)
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return {"%s:%s" % (vk.alg, vk.version): encode_verify_key_base64(vk)}
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def get_signed_key(self, server_name, verify_key):
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key_id = "%s:%s" % (verify_key.alg, verify_key.version)
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res = {
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"server_name": server_name,
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"old_verify_keys": {},
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"valid_until_ts": time.time() * 1000 + 3600,
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"verify_keys": {key_id: {"key": encode_verify_key_base64(verify_key)}},
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}
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self.sign_response(res)
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return res
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def sign_response(self, res):
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signedjson.sign.sign_json(res, self.server_name, self.key)
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class KeyringTestCase(unittest.HomeserverTestCase):
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def make_homeserver(self, reactor, clock):
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self.mock_perspective_server = MockPerspectiveServer()
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self.http_client = Mock()
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config = self.default_config()
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config["trusted_key_servers"] = [
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{
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"server_name": self.mock_perspective_server.server_name,
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"verify_keys": self.mock_perspective_server.get_verify_keys(),
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}
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]
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return self.setup_test_homeserver(
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handlers=None, http_client=self.http_client, config=config
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)
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def check_context(self, _, expected):
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self.assertEquals(
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getattr(LoggingContext.current_context(), "request", None), expected
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)
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def test_wait_for_previous_lookups(self):
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kr = keyring.Keyring(self.hs)
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lookup_1_deferred = defer.Deferred()
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lookup_2_deferred = defer.Deferred()
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# we run the lookup in a logcontext so that the patched inlineCallbacks can check
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# it is doing the right thing with logcontexts.
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wait_1_deferred = run_in_context(
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kr.wait_for_previous_lookups, {"server1": lookup_1_deferred}
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)
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# there were no previous lookups, so the deferred should be ready
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self.successResultOf(wait_1_deferred)
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# set off another wait. It should block because the first lookup
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# hasn't yet completed.
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wait_2_deferred = run_in_context(
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kr.wait_for_previous_lookups, {"server1": lookup_2_deferred}
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)
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self.assertFalse(wait_2_deferred.called)
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# let the first lookup complete (in the sentinel context)
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lookup_1_deferred.callback(None)
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# now the second wait should complete.
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self.successResultOf(wait_2_deferred)
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def test_verify_json_objects_for_server_awaits_previous_requests(self):
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key1 = signedjson.key.generate_signing_key(1)
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kr = keyring.Keyring(self.hs)
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json1 = {}
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signedjson.sign.sign_json(json1, "server10", key1)
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persp_resp = {
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"server_keys": [
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self.mock_perspective_server.get_signed_key(
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"server10", signedjson.key.get_verify_key(key1)
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)
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]
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}
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persp_deferred = defer.Deferred()
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@defer.inlineCallbacks
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def get_perspectives(**kwargs):
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self.assertEquals(LoggingContext.current_context().request, "11")
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with logcontext.PreserveLoggingContext():
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yield persp_deferred
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defer.returnValue(persp_resp)
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self.http_client.post_json.side_effect = get_perspectives
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# start off a first set of lookups
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@defer.inlineCallbacks
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def first_lookup():
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with LoggingContext("11") as context_11:
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context_11.request = "11"
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res_deferreds = kr.verify_json_objects_for_server(
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[("server10", json1, 0, "test10"), ("server11", {}, 0, "test11")]
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)
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# the unsigned json should be rejected pretty quickly
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self.assertTrue(res_deferreds[1].called)
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try:
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yield res_deferreds[1]
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self.assertFalse("unsigned json didn't cause a failure")
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except SynapseError:
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pass
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self.assertFalse(res_deferreds[0].called)
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res_deferreds[0].addBoth(self.check_context, None)
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yield logcontext.make_deferred_yieldable(res_deferreds[0])
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# let verify_json_objects_for_server finish its work before we kill the
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# logcontext
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yield self.clock.sleep(0)
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d0 = first_lookup()
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# wait a tick for it to send the request to the perspectives server
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# (it first tries the datastore)
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self.pump()
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self.http_client.post_json.assert_called_once()
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# a second request for a server with outstanding requests
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# should block rather than start a second call
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@defer.inlineCallbacks
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def second_lookup():
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with LoggingContext("12") as context_12:
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context_12.request = "12"
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self.http_client.post_json.reset_mock()
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self.http_client.post_json.return_value = defer.Deferred()
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res_deferreds_2 = kr.verify_json_objects_for_server(
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[("server10", json1, 0, "test")]
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)
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res_deferreds_2[0].addBoth(self.check_context, None)
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yield logcontext.make_deferred_yieldable(res_deferreds_2[0])
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# let verify_json_objects_for_server finish its work before we kill the
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# logcontext
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yield self.clock.sleep(0)
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d2 = second_lookup()
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self.pump()
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self.http_client.post_json.assert_not_called()
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# complete the first request
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persp_deferred.callback(persp_resp)
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self.get_success(d0)
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self.get_success(d2)
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def test_verify_json_for_server(self):
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kr = keyring.Keyring(self.hs)
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key1 = signedjson.key.generate_signing_key(1)
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r = self.hs.datastore.store_server_verify_keys(
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"server9",
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time.time() * 1000,
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[("server9", get_key_id(key1), FetchKeyResult(get_verify_key(key1), 1000))],
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)
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self.get_success(r)
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json1 = {}
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signedjson.sign.sign_json(json1, "server9", key1)
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# should fail immediately on an unsigned object
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d = _verify_json_for_server(kr, "server9", {}, 0, "test unsigned")
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self.failureResultOf(d, SynapseError)
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# should suceed on a signed object
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d = _verify_json_for_server(kr, "server9", json1, 500, "test signed")
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# self.assertFalse(d.called)
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self.get_success(d)
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def test_verify_json_dedupes_key_requests(self):
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"""Two requests for the same key should be deduped."""
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key1 = signedjson.key.generate_signing_key(1)
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def get_keys(keys_to_fetch):
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# there should only be one request object (with the max validity)
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self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}})
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return defer.succeed(
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{
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"server1": {
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get_key_id(key1): FetchKeyResult(get_verify_key(key1), 1200)
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}
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}
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)
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mock_fetcher = keyring.KeyFetcher()
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mock_fetcher.get_keys = Mock(side_effect=get_keys)
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kr = keyring.Keyring(self.hs, key_fetchers=(mock_fetcher,))
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json1 = {}
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signedjson.sign.sign_json(json1, "server1", key1)
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# the first request should succeed; the second should fail because the key
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# has expired
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results = kr.verify_json_objects_for_server(
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[("server1", json1, 500, "test1"), ("server1", json1, 1500, "test2")]
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)
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self.assertEqual(len(results), 2)
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self.get_success(results[0])
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e = self.get_failure(results[1], SynapseError).value
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self.assertEqual(e.errcode, "M_UNAUTHORIZED")
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self.assertEqual(e.code, 401)
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# there should have been a single call to the fetcher
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mock_fetcher.get_keys.assert_called_once()
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def test_verify_json_falls_back_to_other_fetchers(self):
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"""If the first fetcher cannot provide a recent enough key, we fall back"""
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key1 = signedjson.key.generate_signing_key(1)
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def get_keys1(keys_to_fetch):
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self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}})
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return defer.succeed(
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{
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"server1": {
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get_key_id(key1): FetchKeyResult(get_verify_key(key1), 800)
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}
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}
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)
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def get_keys2(keys_to_fetch):
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self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}})
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return defer.succeed(
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{
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"server1": {
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get_key_id(key1): FetchKeyResult(get_verify_key(key1), 1200)
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}
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}
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)
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mock_fetcher1 = keyring.KeyFetcher()
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mock_fetcher1.get_keys = Mock(side_effect=get_keys1)
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mock_fetcher2 = keyring.KeyFetcher()
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mock_fetcher2.get_keys = Mock(side_effect=get_keys2)
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kr = keyring.Keyring(self.hs, key_fetchers=(mock_fetcher1, mock_fetcher2))
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json1 = {}
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signedjson.sign.sign_json(json1, "server1", key1)
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results = kr.verify_json_objects_for_server(
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[("server1", json1, 1200, "test1"), ("server1", json1, 1500, "test2")]
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)
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self.assertEqual(len(results), 2)
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self.get_success(results[0])
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e = self.get_failure(results[1], SynapseError).value
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self.assertEqual(e.errcode, "M_UNAUTHORIZED")
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self.assertEqual(e.code, 401)
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# there should have been a single call to each fetcher
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mock_fetcher1.get_keys.assert_called_once()
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mock_fetcher2.get_keys.assert_called_once()
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class ServerKeyFetcherTestCase(unittest.HomeserverTestCase):
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def make_homeserver(self, reactor, clock):
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self.http_client = Mock()
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hs = self.setup_test_homeserver(handlers=None, http_client=self.http_client)
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return hs
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def test_get_keys_from_server(self):
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# arbitrarily advance the clock a bit
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self.reactor.advance(100)
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SERVER_NAME = "server2"
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fetcher = ServerKeyFetcher(self.hs)
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testkey = signedjson.key.generate_signing_key("ver1")
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testverifykey = signedjson.key.get_verify_key(testkey)
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testverifykey_id = "ed25519:ver1"
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VALID_UNTIL_TS = 200 * 1000
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# valid response
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response = {
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"server_name": SERVER_NAME,
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"old_verify_keys": {},
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"valid_until_ts": VALID_UNTIL_TS,
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"verify_keys": {
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testverifykey_id: {
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"key": signedjson.key.encode_verify_key_base64(testverifykey)
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}
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},
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}
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signedjson.sign.sign_json(response, SERVER_NAME, testkey)
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def get_json(destination, path, **kwargs):
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self.assertEqual(destination, SERVER_NAME)
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self.assertEqual(path, "/_matrix/key/v2/server/key1")
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return response
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self.http_client.get_json.side_effect = get_json
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keys_to_fetch = {SERVER_NAME: {"key1": 0}}
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keys = self.get_success(fetcher.get_keys(keys_to_fetch))
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k = keys[SERVER_NAME][testverifykey_id]
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self.assertEqual(k.valid_until_ts, VALID_UNTIL_TS)
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self.assertEqual(k.verify_key, testverifykey)
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self.assertEqual(k.verify_key.alg, "ed25519")
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self.assertEqual(k.verify_key.version, "ver1")
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# check that the perspectives store is correctly updated
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lookup_triplet = (SERVER_NAME, testverifykey_id, None)
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key_json = self.get_success(
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self.hs.get_datastore().get_server_keys_json([lookup_triplet])
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)
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res = key_json[lookup_triplet]
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self.assertEqual(len(res), 1)
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res = res[0]
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self.assertEqual(res["key_id"], testverifykey_id)
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self.assertEqual(res["from_server"], SERVER_NAME)
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self.assertEqual(res["ts_added_ms"], self.reactor.seconds() * 1000)
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self.assertEqual(res["ts_valid_until_ms"], VALID_UNTIL_TS)
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# we expect it to be encoded as canonical json *before* it hits the db
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self.assertEqual(
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bytes(res["key_json"]), canonicaljson.encode_canonical_json(response)
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)
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# change the server name: the result should be ignored
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response["server_name"] = "OTHER_SERVER"
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keys = self.get_success(fetcher.get_keys(keys_to_fetch))
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self.assertEqual(keys, {})
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class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase):
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def make_homeserver(self, reactor, clock):
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self.mock_perspective_server = MockPerspectiveServer()
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self.http_client = Mock()
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config = self.default_config()
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config["trusted_key_servers"] = [
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{
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"server_name": self.mock_perspective_server.server_name,
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"verify_keys": self.mock_perspective_server.get_verify_keys(),
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}
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]
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return self.setup_test_homeserver(
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handlers=None, http_client=self.http_client, config=config
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)
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def test_get_keys_from_perspectives(self):
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# arbitrarily advance the clock a bit
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self.reactor.advance(100)
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fetcher = PerspectivesKeyFetcher(self.hs)
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SERVER_NAME = "server2"
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testkey = signedjson.key.generate_signing_key("ver1")
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testverifykey = signedjson.key.get_verify_key(testkey)
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testverifykey_id = "ed25519:ver1"
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VALID_UNTIL_TS = 200 * 1000
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# valid response
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response = {
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"server_name": SERVER_NAME,
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"old_verify_keys": {},
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"valid_until_ts": VALID_UNTIL_TS,
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"verify_keys": {
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testverifykey_id: {
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"key": signedjson.key.encode_verify_key_base64(testverifykey)
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}
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},
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}
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# the response must be signed by both the origin server and the perspectives
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# server.
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signedjson.sign.sign_json(response, SERVER_NAME, testkey)
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self.mock_perspective_server.sign_response(response)
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def post_json(destination, path, data, **kwargs):
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self.assertEqual(destination, self.mock_perspective_server.server_name)
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self.assertEqual(path, "/_matrix/key/v2/query")
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# check that the request is for the expected key
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q = data["server_keys"]
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self.assertEqual(list(q[SERVER_NAME].keys()), ["key1"])
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return {"server_keys": [response]}
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self.http_client.post_json.side_effect = post_json
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keys_to_fetch = {SERVER_NAME: {"key1": 0}}
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keys = self.get_success(fetcher.get_keys(keys_to_fetch))
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self.assertIn(SERVER_NAME, keys)
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k = keys[SERVER_NAME][testverifykey_id]
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self.assertEqual(k.valid_until_ts, VALID_UNTIL_TS)
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self.assertEqual(k.verify_key, testverifykey)
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self.assertEqual(k.verify_key.alg, "ed25519")
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self.assertEqual(k.verify_key.version, "ver1")
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# check that the perspectives store is correctly updated
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lookup_triplet = (SERVER_NAME, testverifykey_id, None)
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key_json = self.get_success(
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self.hs.get_datastore().get_server_keys_json([lookup_triplet])
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)
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res = key_json[lookup_triplet]
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self.assertEqual(len(res), 1)
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res = res[0]
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self.assertEqual(res["key_id"], testverifykey_id)
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self.assertEqual(res["from_server"], self.mock_perspective_server.server_name)
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self.assertEqual(res["ts_added_ms"], self.reactor.seconds() * 1000)
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self.assertEqual(res["ts_valid_until_ms"], VALID_UNTIL_TS)
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self.assertEqual(
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bytes(res["key_json"]), canonicaljson.encode_canonical_json(response)
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)
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def test_invalid_perspectives_responses(self):
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"""Check that invalid responses from the perspectives server are rejected"""
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# arbitrarily advance the clock a bit
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self.reactor.advance(100)
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SERVER_NAME = "server2"
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testkey = signedjson.key.generate_signing_key("ver1")
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testverifykey = signedjson.key.get_verify_key(testkey)
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testverifykey_id = "ed25519:ver1"
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VALID_UNTIL_TS = 200 * 1000
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def build_response():
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# valid response
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response = {
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"server_name": SERVER_NAME,
|
|
"old_verify_keys": {},
|
|
"valid_until_ts": VALID_UNTIL_TS,
|
|
"verify_keys": {
|
|
testverifykey_id: {
|
|
"key": signedjson.key.encode_verify_key_base64(testverifykey)
|
|
}
|
|
},
|
|
}
|
|
|
|
# the response must be signed by both the origin server and the perspectives
|
|
# server.
|
|
signedjson.sign.sign_json(response, SERVER_NAME, testkey)
|
|
self.mock_perspective_server.sign_response(response)
|
|
return response
|
|
|
|
def get_key_from_perspectives(response):
|
|
fetcher = PerspectivesKeyFetcher(self.hs)
|
|
keys_to_fetch = {SERVER_NAME: {"key1": 0}}
|
|
|
|
def post_json(destination, path, data, **kwargs):
|
|
self.assertEqual(destination, self.mock_perspective_server.server_name)
|
|
self.assertEqual(path, "/_matrix/key/v2/query")
|
|
return {"server_keys": [response]}
|
|
|
|
self.http_client.post_json.side_effect = post_json
|
|
|
|
return self.get_success(fetcher.get_keys(keys_to_fetch))
|
|
|
|
# start with a valid response so we can check we are testing the right thing
|
|
response = build_response()
|
|
keys = get_key_from_perspectives(response)
|
|
k = keys[SERVER_NAME][testverifykey_id]
|
|
self.assertEqual(k.verify_key, testverifykey)
|
|
|
|
# remove the perspectives server's signature
|
|
response = build_response()
|
|
del response["signatures"][self.mock_perspective_server.server_name]
|
|
self.http_client.post_json.return_value = {"server_keys": [response]}
|
|
keys = get_key_from_perspectives(response)
|
|
self.assertEqual(keys, {}, "Expected empty dict with missing persp server sig")
|
|
|
|
# remove the origin server's signature
|
|
response = build_response()
|
|
del response["signatures"][SERVER_NAME]
|
|
self.http_client.post_json.return_value = {"server_keys": [response]}
|
|
keys = get_key_from_perspectives(response)
|
|
self.assertEqual(keys, {}, "Expected empty dict with missing origin server sig")
|
|
|
|
|
|
def get_key_id(key):
|
|
"""Get the matrix ID tag for a given SigningKey or VerifyKey"""
|
|
return "%s:%s" % (key.alg, key.version)
|
|
|
|
|
|
@defer.inlineCallbacks
|
|
def run_in_context(f, *args, **kwargs):
|
|
with LoggingContext("testctx") as ctx:
|
|
# we set the "request" prop to make it easier to follow what's going on in the
|
|
# logs.
|
|
ctx.request = "testctx"
|
|
rv = yield f(*args, **kwargs)
|
|
defer.returnValue(rv)
|
|
|
|
|
|
def _verify_json_for_server(kr, *args):
|
|
"""thin wrapper around verify_json_for_server which makes sure it is wrapped
|
|
with the patched defer.inlineCallbacks.
|
|
"""
|
|
|
|
@defer.inlineCallbacks
|
|
def v():
|
|
rv1 = yield kr.verify_json_for_server(*args)
|
|
defer.returnValue(rv1)
|
|
|
|
return run_in_context(v)
|