diff options
Diffstat (limited to 'tests/crypto/test_keyring.py')
| -rw-r--r-- | tests/crypto/test_keyring.py | 334 |
1 files changed, 288 insertions, 46 deletions
diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py index 3c79d4afe7..5a355f00cc 100644 --- a/tests/crypto/test_keyring.py +++ b/tests/crypto/test_keyring.py @@ -19,12 +19,18 @@ from mock import Mock import canonicaljson import signedjson.key import signedjson.sign +from signedjson.key import encode_verify_key_base64, get_verify_key from twisted.internet import defer from synapse.api.errors import SynapseError from synapse.crypto import keyring -from synapse.crypto.keyring import KeyLookupError +from synapse.crypto.keyring import ( + PerspectivesKeyFetcher, + ServerKeyFetcher, + StoreKeyFetcher, +) +from synapse.storage.keys import FetchKeyResult from synapse.util import logcontext from synapse.util.logcontext import LoggingContext @@ -38,7 +44,7 @@ class MockPerspectiveServer(object): def get_verify_keys(self): vk = signedjson.key.get_verify_key(self.key) - return {"%s:%s" % (vk.alg, vk.version): vk} + return {"%s:%s" % (vk.alg, vk.version): encode_verify_key_base64(vk)} def get_signed_key(self, server_name, verify_key): key_id = "%s:%s" % (verify_key.alg, verify_key.version) @@ -46,25 +52,31 @@ class MockPerspectiveServer(object): "server_name": server_name, "old_verify_keys": {}, "valid_until_ts": time.time() * 1000 + 3600, - "verify_keys": { - key_id: {"key": signedjson.key.encode_verify_key_base64(verify_key)} - }, + "verify_keys": {key_id: {"key": encode_verify_key_base64(verify_key)}}, } - return self.get_signed_response(res) + self.sign_response(res) + return res - def get_signed_response(self, res): + def sign_response(self, res): signedjson.sign.sign_json(res, self.server_name, self.key) - return res class KeyringTestCase(unittest.HomeserverTestCase): def make_homeserver(self, reactor, clock): self.mock_perspective_server = MockPerspectiveServer() self.http_client = Mock() - hs = self.setup_test_homeserver(handlers=None, http_client=self.http_client) - keys = self.mock_perspective_server.get_verify_keys() - hs.config.perspectives = {self.mock_perspective_server.server_name: keys} - return hs + + config = self.default_config() + config["trusted_key_servers"] = [ + { + "server_name": self.mock_perspective_server.server_name, + "verify_keys": self.mock_perspective_server.get_verify_keys(), + } + ] + + return self.setup_test_homeserver( + handlers=None, http_client=self.http_client, config=config + ) def check_context(self, _, expected): self.assertEquals( @@ -80,7 +92,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): # we run the lookup in a logcontext so that the patched inlineCallbacks can check # it is doing the right thing with logcontexts. wait_1_deferred = run_in_context( - kr.wait_for_previous_lookups, ["server1"], {"server1": lookup_1_deferred} + kr.wait_for_previous_lookups, {"server1": lookup_1_deferred} ) # there were no previous lookups, so the deferred should be ready @@ -89,7 +101,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): # set off another wait. It should block because the first lookup # hasn't yet completed. wait_2_deferred = run_in_context( - kr.wait_for_previous_lookups, ["server1"], {"server1": lookup_2_deferred} + kr.wait_for_previous_lookups, {"server1": lookup_2_deferred} ) self.assertFalse(wait_2_deferred.called) @@ -132,7 +144,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): context_11.request = "11" res_deferreds = kr.verify_json_objects_for_server( - [("server10", json1), ("server11", {})] + [("server10", json1, 0, "test10"), ("server11", {}, 0, "test11")] ) # the unsigned json should be rejected pretty quickly @@ -169,7 +181,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): self.http_client.post_json.return_value = defer.Deferred() res_deferreds_2 = kr.verify_json_objects_for_server( - [("server10", json1)] + [("server10", json1, 0, "test")] ) res_deferreds_2[0].addBoth(self.check_context, None) yield logcontext.make_deferred_yieldable(res_deferreds_2[0]) @@ -192,31 +204,169 @@ class KeyringTestCase(unittest.HomeserverTestCase): kr = keyring.Keyring(self.hs) key1 = signedjson.key.generate_signing_key(1) - r = self.hs.datastore.store_server_verify_key( - "server9", "", time.time() * 1000, signedjson.key.get_verify_key(key1) + r = self.hs.datastore.store_server_verify_keys( + "server9", + time.time() * 1000, + [("server9", get_key_id(key1), FetchKeyResult(get_verify_key(key1), 1000))], + ) + self.get_success(r) + + json1 = {} + signedjson.sign.sign_json(json1, "server9", key1) + + # should fail immediately on an unsigned object + d = _verify_json_for_server(kr, "server9", {}, 0, "test unsigned") + self.failureResultOf(d, SynapseError) + + # should suceed on a signed object + d = _verify_json_for_server(kr, "server9", json1, 500, "test signed") + # self.assertFalse(d.called) + self.get_success(d) + + def test_verify_json_for_server_with_null_valid_until_ms(self): + """Tests that we correctly handle key requests for keys we've stored + with a null `ts_valid_until_ms` + """ + mock_fetcher = keyring.KeyFetcher() + mock_fetcher.get_keys = Mock(return_value=defer.succeed({})) + + kr = keyring.Keyring( + self.hs, key_fetchers=(StoreKeyFetcher(self.hs), mock_fetcher) + ) + + key1 = signedjson.key.generate_signing_key(1) + r = self.hs.datastore.store_server_verify_keys( + "server9", + time.time() * 1000, + [("server9", get_key_id(key1), FetchKeyResult(get_verify_key(key1), None))], ) self.get_success(r) + json1 = {} signedjson.sign.sign_json(json1, "server9", key1) # should fail immediately on an unsigned object - d = _verify_json_for_server(kr, "server9", {}) + d = _verify_json_for_server(kr, "server9", {}, 0, "test unsigned") self.failureResultOf(d, SynapseError) - d = _verify_json_for_server(kr, "server9", json1) - self.assertFalse(d.called) + # should fail on a signed object with a non-zero minimum_valid_until_ms, + # as it tries to refetch the keys and fails. + d = _verify_json_for_server( + kr, "server9", json1, 500, "test signed non-zero min" + ) + self.get_failure(d, SynapseError) + + # We expect the keyring tried to refetch the key once. + mock_fetcher.get_keys.assert_called_once_with( + {"server9": {get_key_id(key1): 500}} + ) + + # should succeed on a signed object with a 0 minimum_valid_until_ms + d = _verify_json_for_server( + kr, "server9", json1, 0, "test signed with zero min" + ) self.get_success(d) + def test_verify_json_dedupes_key_requests(self): + """Two requests for the same key should be deduped.""" + key1 = signedjson.key.generate_signing_key(1) + + def get_keys(keys_to_fetch): + # there should only be one request object (with the max validity) + self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}}) + + return defer.succeed( + { + "server1": { + get_key_id(key1): FetchKeyResult(get_verify_key(key1), 1200) + } + } + ) + + mock_fetcher = keyring.KeyFetcher() + mock_fetcher.get_keys = Mock(side_effect=get_keys) + kr = keyring.Keyring(self.hs, key_fetchers=(mock_fetcher,)) + + json1 = {} + signedjson.sign.sign_json(json1, "server1", key1) + + # the first request should succeed; the second should fail because the key + # has expired + results = kr.verify_json_objects_for_server( + [("server1", json1, 500, "test1"), ("server1", json1, 1500, "test2")] + ) + self.assertEqual(len(results), 2) + self.get_success(results[0]) + e = self.get_failure(results[1], SynapseError).value + self.assertEqual(e.errcode, "M_UNAUTHORIZED") + self.assertEqual(e.code, 401) + + # there should have been a single call to the fetcher + mock_fetcher.get_keys.assert_called_once() + + def test_verify_json_falls_back_to_other_fetchers(self): + """If the first fetcher cannot provide a recent enough key, we fall back""" + key1 = signedjson.key.generate_signing_key(1) + + def get_keys1(keys_to_fetch): + self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}}) + return defer.succeed( + { + "server1": { + get_key_id(key1): FetchKeyResult(get_verify_key(key1), 800) + } + } + ) + + def get_keys2(keys_to_fetch): + self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}}) + return defer.succeed( + { + "server1": { + get_key_id(key1): FetchKeyResult(get_verify_key(key1), 1200) + } + } + ) + + mock_fetcher1 = keyring.KeyFetcher() + mock_fetcher1.get_keys = Mock(side_effect=get_keys1) + mock_fetcher2 = keyring.KeyFetcher() + mock_fetcher2.get_keys = Mock(side_effect=get_keys2) + kr = keyring.Keyring(self.hs, key_fetchers=(mock_fetcher1, mock_fetcher2)) + + json1 = {} + signedjson.sign.sign_json(json1, "server1", key1) + + results = kr.verify_json_objects_for_server( + [("server1", json1, 1200, "test1"), ("server1", json1, 1500, "test2")] + ) + self.assertEqual(len(results), 2) + self.get_success(results[0]) + e = self.get_failure(results[1], SynapseError).value + self.assertEqual(e.errcode, "M_UNAUTHORIZED") + self.assertEqual(e.code, 401) + + # there should have been a single call to each fetcher + mock_fetcher1.get_keys.assert_called_once() + mock_fetcher2.get_keys.assert_called_once() + + +class ServerKeyFetcherTestCase(unittest.HomeserverTestCase): + def make_homeserver(self, reactor, clock): + self.http_client = Mock() + hs = self.setup_test_homeserver(handlers=None, http_client=self.http_client) + return hs + def test_get_keys_from_server(self): # arbitrarily advance the clock a bit self.reactor.advance(100) SERVER_NAME = "server2" - kr = keyring.Keyring(self.hs) + fetcher = ServerKeyFetcher(self.hs) testkey = signedjson.key.generate_signing_key("ver1") testverifykey = signedjson.key.get_verify_key(testkey) testverifykey_id = "ed25519:ver1" - VALID_UNTIL_TS = 1000 + VALID_UNTIL_TS = 200 * 1000 # valid response response = { @@ -238,12 +388,13 @@ class KeyringTestCase(unittest.HomeserverTestCase): self.http_client.get_json.side_effect = get_json - server_name_and_key_ids = [(SERVER_NAME, ("key1",))] - keys = self.get_success(kr.get_keys_from_server(server_name_and_key_ids)) + keys_to_fetch = {SERVER_NAME: {"key1": 0}} + keys = self.get_success(fetcher.get_keys(keys_to_fetch)) k = keys[SERVER_NAME][testverifykey_id] - self.assertEqual(k, testverifykey) - self.assertEqual(k.alg, "ed25519") - self.assertEqual(k.version, "ver1") + 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) @@ -263,18 +414,37 @@ class KeyringTestCase(unittest.HomeserverTestCase): bytes(res["key_json"]), canonicaljson.encode_canonical_json(response) ) - # change the server name: it should cause a rejection + # change the server name: the result should be ignored response["server_name"] = "OTHER_SERVER" - self.get_failure( - kr.get_keys_from_server(server_name_and_key_ids), KeyLookupError + + keys = self.get_success(fetcher.get_keys(keys_to_fetch)) + self.assertEqual(keys, {}) + + +class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): + def make_homeserver(self, reactor, clock): + self.mock_perspective_server = MockPerspectiveServer() + self.http_client = Mock() + + config = self.default_config() + config["trusted_key_servers"] = [ + { + "server_name": self.mock_perspective_server.server_name, + "verify_keys": self.mock_perspective_server.get_verify_keys(), + } + ] + + return self.setup_test_homeserver( + handlers=None, http_client=self.http_client, config=config ) def test_get_keys_from_perspectives(self): # arbitrarily advance the clock a bit self.reactor.advance(100) + fetcher = PerspectivesKeyFetcher(self.hs) + SERVER_NAME = "server2" - kr = keyring.Keyring(self.hs) testkey = signedjson.key.generate_signing_key("ver1") testverifykey = signedjson.key.get_verify_key(testkey) testverifykey_id = "ed25519:ver1" @@ -292,9 +462,10 @@ class KeyringTestCase(unittest.HomeserverTestCase): }, } - persp_resp = { - "server_keys": [self.mock_perspective_server.get_signed_response(response)] - } + # 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) def post_json(destination, path, data, **kwargs): self.assertEqual(destination, self.mock_perspective_server.server_name) @@ -303,17 +474,18 @@ class KeyringTestCase(unittest.HomeserverTestCase): # check that the request is for the expected key q = data["server_keys"] self.assertEqual(list(q[SERVER_NAME].keys()), ["key1"]) - return persp_resp + return {"server_keys": [response]} self.http_client.post_json.side_effect = post_json - server_name_and_key_ids = [(SERVER_NAME, ("key1",))] - keys = self.get_success(kr.get_keys_from_perspectives(server_name_and_key_ids)) + 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, testverifykey) - self.assertEqual(k.alg, "ed25519") - self.assertEqual(k.version, "ver1") + 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) @@ -329,26 +501,96 @@ class KeyringTestCase(unittest.HomeserverTestCase): self.assertEqual(res["ts_valid_until_ms"], VALID_UNTIL_TS) self.assertEqual( - bytes(res["key_json"]), - canonicaljson.encode_canonical_json(persp_resp["server_keys"][0]), + 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(): + # valid response + response = { + "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"): + 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(keyring, server_name, json_object): +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 keyring.verify_json_for_server(server_name, json_object) + rv1 = yield kr.verify_json_for_server(*args) defer.returnValue(rv1) return run_in_context(v) |