606 lines
22 KiB
Python
606 lines
22 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 nacl.signing import SigningKey
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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 twisted.internet.defer import Deferred, ensureDeferred
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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 (
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PerspectivesKeyFetcher,
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ServerKeyFetcher,
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StoreKeyFetcher,
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)
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from synapse.logging.context import (
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LoggingContext,
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current_context,
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make_deferred_yieldable,
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)
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from synapse.storage.keys import FetchKeyResult
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from tests import unittest
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from tests.test_utils import make_awaitable
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from tests.unittest import logcontext_clean
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class MockPerspectiveServer:
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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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@logcontext_clean
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class KeyringTestCase(unittest.HomeserverTestCase):
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def check_context(self, val, expected):
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self.assertEquals(getattr(current_context(), "request", None), expected)
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return val
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def test_verify_json_objects_for_server_awaits_previous_requests(self):
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mock_fetcher = keyring.KeyFetcher()
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mock_fetcher.get_keys = Mock()
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kr = keyring.Keyring(self.hs, key_fetchers=(mock_fetcher,))
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# a signed object that we are going to try to validate
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key1 = signedjson.key.generate_signing_key(1)
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json1 = {}
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signedjson.sign.sign_json(json1, "server10", key1)
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# start off a first set of lookups. We make the mock fetcher block until this
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# deferred completes.
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first_lookup_deferred = Deferred()
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async def first_lookup_fetch(keys_to_fetch):
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self.assertEquals(current_context().request, "context_11")
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self.assertEqual(keys_to_fetch, {"server10": {get_key_id(key1): 0}})
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await make_deferred_yieldable(first_lookup_deferred)
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return {
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"server10": {
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get_key_id(key1): FetchKeyResult(get_verify_key(key1), 100)
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}
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}
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mock_fetcher.get_keys.side_effect = first_lookup_fetch
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async def first_lookup():
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with LoggingContext("context_11") as context_11:
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context_11.request = "context_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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await 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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await make_deferred_yieldable(res_deferreds[0])
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d0 = ensureDeferred(first_lookup())
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mock_fetcher.get_keys.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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async def second_lookup_fetch(keys_to_fetch):
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self.assertEquals(current_context().request, "context_12")
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return {
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"server10": {
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get_key_id(key1): FetchKeyResult(get_verify_key(key1), 100)
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}
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}
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mock_fetcher.get_keys.reset_mock()
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mock_fetcher.get_keys.side_effect = second_lookup_fetch
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second_lookup_state = [0]
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async def second_lookup():
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with LoggingContext("context_12") as context_12:
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context_12.request = "context_12"
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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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second_lookup_state[0] = 1
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await make_deferred_yieldable(res_deferreds_2[0])
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second_lookup_state[0] = 2
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d2 = ensureDeferred(second_lookup())
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self.pump()
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# the second request should be pending, but the fetcher should not yet have been
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# called
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self.assertEqual(second_lookup_state[0], 1)
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mock_fetcher.get_keys.assert_not_called()
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# complete the first request
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first_lookup_deferred.callback(None)
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# and now both verifications should succeed.
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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.get_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.get_failure(d, SynapseError)
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# should succeed 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_for_server_with_null_valid_until_ms(self):
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"""Tests that we correctly handle key requests for keys we've stored
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with a null `ts_valid_until_ms`
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"""
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mock_fetcher = keyring.KeyFetcher()
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mock_fetcher.get_keys = Mock(return_value=make_awaitable({}))
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kr = keyring.Keyring(
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self.hs, key_fetchers=(StoreKeyFetcher(self.hs), mock_fetcher)
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)
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key1 = signedjson.key.generate_signing_key(1)
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r = self.hs.get_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), None))],
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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.get_failure(d, SynapseError)
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# should fail on a signed object with a non-zero minimum_valid_until_ms,
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# as it tries to refetch the keys and fails.
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d = _verify_json_for_server(
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kr, "server9", json1, 500, "test signed non-zero min"
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)
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self.get_failure(d, SynapseError)
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# We expect the keyring tried to refetch the key once.
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mock_fetcher.get_keys.assert_called_once_with(
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{"server9": {get_key_id(key1): 500}}
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)
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# should succeed on a signed object with a 0 minimum_valid_until_ms
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d = _verify_json_for_server(
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kr, "server9", json1, 0, "test signed with zero min"
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)
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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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async 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 {
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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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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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async 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 {
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"server1": {get_key_id(key1): FetchKeyResult(get_verify_key(key1), 800)}
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}
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async 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 {
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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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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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@logcontext_clean
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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(federation_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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async 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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federation_http_client=self.http_client, config=config
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)
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def build_perspectives_response(
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self, server_name: str, signing_key: SigningKey, valid_until_ts: int,
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) -> dict:
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"""
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Build a valid perspectives server response to a request for the given key
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"""
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verify_key = signedjson.key.get_verify_key(signing_key)
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verifykey_id = "%s:%s" % (verify_key.alg, verify_key.version)
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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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verifykey_id: {
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"key": signedjson.key.encode_verify_key_base64(verify_key)
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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, signing_key)
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self.mock_perspective_server.sign_response(response)
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return response
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def expect_outgoing_key_query(
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self, expected_server_name: str, expected_key_id: str, response: dict
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) -> None:
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"""
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Tell the mock http client to expect a perspectives-server key query
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"""
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async 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[expected_server_name].keys()), [expected_key_id])
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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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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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response = self.build_perspectives_response(
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SERVER_NAME, testkey, VALID_UNTIL_TS,
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)
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self.expect_outgoing_key_query(SERVER_NAME, "key1", response)
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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])
|
|
)
|
|
res = key_json[lookup_triplet]
|
|
self.assertEqual(len(res), 1)
|
|
res = res[0]
|
|
self.assertEqual(res["key_id"], testverifykey_id)
|
|
self.assertEqual(res["from_server"], self.mock_perspective_server.server_name)
|
|
self.assertEqual(res["ts_added_ms"], self.reactor.seconds() * 1000)
|
|
self.assertEqual(res["ts_valid_until_ms"], VALID_UNTIL_TS)
|
|
|
|
self.assertEqual(
|
|
bytes(res["key_json"]), canonicaljson.encode_canonical_json(response)
|
|
)
|
|
|
|
def test_get_perspectives_own_key(self):
|
|
"""Check that we can get the perspectives server's own keys
|
|
|
|
This is slightly complicated by the fact that the perspectives server may
|
|
use different keys for signing notary responses.
|
|
"""
|
|
|
|
# arbitrarily advance the clock a bit
|
|
self.reactor.advance(100)
|
|
|
|
fetcher = PerspectivesKeyFetcher(self.hs)
|
|
|
|
SERVER_NAME = self.mock_perspective_server.server_name
|
|
testkey = signedjson.key.generate_signing_key("ver1")
|
|
testverifykey = signedjson.key.get_verify_key(testkey)
|
|
testverifykey_id = "ed25519:ver1"
|
|
VALID_UNTIL_TS = 200 * 1000
|
|
|
|
response = self.build_perspectives_response(
|
|
SERVER_NAME, testkey, VALID_UNTIL_TS
|
|
)
|
|
|
|
self.expect_outgoing_key_query(SERVER_NAME, "key1", response)
|
|
|
|
keys_to_fetch = {SERVER_NAME: {"key1": 0}}
|
|
keys = self.get_success(fetcher.get_keys(keys_to_fetch))
|
|
self.assertIn(SERVER_NAME, keys)
|
|
k = keys[SERVER_NAME][testverifykey_id]
|
|
self.assertEqual(k.valid_until_ts, VALID_UNTIL_TS)
|
|
self.assertEqual(k.verify_key, testverifykey)
|
|
self.assertEqual(k.verify_key.alg, "ed25519")
|
|
self.assertEqual(k.verify_key.version, "ver1")
|
|
|
|
# check that the perspectives store is correctly updated
|
|
lookup_triplet = (SERVER_NAME, testverifykey_id, None)
|
|
key_json = self.get_success(
|
|
self.hs.get_datastore().get_server_keys_json([lookup_triplet])
|
|
)
|
|
res = key_json[lookup_triplet]
|
|
self.assertEqual(len(res), 1)
|
|
res = res[0]
|
|
self.assertEqual(res["key_id"], testverifykey_id)
|
|
self.assertEqual(res["from_server"], self.mock_perspective_server.server_name)
|
|
self.assertEqual(res["ts_added_ms"], self.reactor.seconds() * 1000)
|
|
self.assertEqual(res["ts_valid_until_ms"], VALID_UNTIL_TS)
|
|
|
|
self.assertEqual(
|
|
bytes(res["key_json"]), canonicaljson.encode_canonical_json(response)
|
|
)
|
|
|
|
def test_invalid_perspectives_responses(self):
|
|
"""Check that invalid responses from the perspectives server are rejected"""
|
|
# arbitrarily advance the clock a bit
|
|
self.reactor.advance(100)
|
|
|
|
SERVER_NAME = "server2"
|
|
testkey = signedjson.key.generate_signing_key("ver1")
|
|
testverifykey = signedjson.key.get_verify_key(testkey)
|
|
testverifykey_id = "ed25519:ver1"
|
|
VALID_UNTIL_TS = 200 * 1000
|
|
|
|
def build_response():
|
|
return self.build_perspectives_response(
|
|
SERVER_NAME, testkey, VALID_UNTIL_TS
|
|
)
|
|
|
|
def get_key_from_perspectives(response):
|
|
fetcher = PerspectivesKeyFetcher(self.hs)
|
|
keys_to_fetch = {SERVER_NAME: {"key1": 0}}
|
|
self.expect_outgoing_key_query(SERVER_NAME, "key1", response)
|
|
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]
|
|
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]
|
|
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)
|
|
return 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)
|
|
return rv1
|
|
|
|
return run_in_context(v)
|