From fec2dcb1a538ab8ab447f724af1a94d5b3517197 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff <1389908+richvdh@users.noreply.github.com> Date: Mon, 3 Jun 2019 22:59:51 +0100 Subject: Enforce validity period on server_keys for fed requests. (#5321) When handling incoming federation requests, make sure that we have an up-to-date copy of the signing key. We do not yet enforce the validity period for event signatures. --- tests/crypto/test_keyring.py | 135 ++++++++++++++++++++++++++++++++++--------- 1 file changed, 108 insertions(+), 27 deletions(-) (limited to 'tests/crypto/test_keyring.py') diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py index 3933ad4347..096401938d 100644 --- a/tests/crypto/test_keyring.py +++ b/tests/crypto/test_keyring.py @@ -19,6 +19,7 @@ from mock import Mock import canonicaljson import signedjson.key import signedjson.sign +from signedjson.key import get_verify_key from twisted.internet import defer @@ -137,7 +138,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): context_11.request = "11" res_deferreds = kr.verify_json_objects_for_server( - [("server10", json1), ("server11", {})] + [("server10", json1, 0), ("server11", {}, 0)] ) # the unsigned json should be rejected pretty quickly @@ -174,7 +175,7 @@ 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)] ) res_deferreds_2[0].addBoth(self.check_context, None) yield logcontext.make_deferred_yieldable(res_deferreds_2[0]) @@ -197,31 +198,108 @@ class KeyringTestCase(unittest.HomeserverTestCase): kr = keyring.Keyring(self.hs) key1 = signedjson.key.generate_signing_key(1) - key1_id = "%s:%s" % (key1.alg, key1.version) - r = self.hs.datastore.store_server_verify_keys( "server9", time.time() * 1000, - [ - ( - "server9", - key1_id, - FetchKeyResult(signedjson.key.get_verify_key(key1), 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", {}) + d = _verify_json_for_server(kr, "server9", {}, 0) self.failureResultOf(d, SynapseError) - d = _verify_json_for_server(kr, "server9", json1) - self.assertFalse(d.called) + # should suceed on a signed object + d = _verify_json_for_server(kr, "server9", json1, 500) + # self.assertFalse(d.called) 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), ("server1", json1, 1500)] + ) + 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), ("server1", json1, 1500)] + ) + 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): @@ -260,8 +338,8 @@ class ServerKeyFetcherTestCase(unittest.HomeserverTestCase): self.http_client.get_json.side_effect = get_json - server_name_and_key_ids = [(SERVER_NAME, ("key1",))] - keys = self.get_success(fetcher.get_keys(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.valid_until_ts, VALID_UNTIL_TS) self.assertEqual(k.verify_key, testverifykey) @@ -288,9 +366,7 @@ class ServerKeyFetcherTestCase(unittest.HomeserverTestCase): # change the server name: it should cause a rejection response["server_name"] = "OTHER_SERVER" - self.get_failure( - fetcher.get_keys(server_name_and_key_ids), KeyLookupError - ) + self.get_failure(fetcher.get_keys(keys_to_fetch), KeyLookupError) class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): @@ -342,8 +418,8 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): self.http_client.post_json.side_effect = post_json - server_name_and_key_ids = [(SERVER_NAME, ("key1",))] - keys = self.get_success(fetcher.get_keys(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.valid_until_ts, VALID_UNTIL_TS) @@ -401,7 +477,7 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): def get_key_from_perspectives(response): fetcher = PerspectivesKeyFetcher(self.hs) - server_name_and_key_ids = [(SERVER_NAME, ("key1",))] + keys_to_fetch = {SERVER_NAME: {"key1": 0}} def post_json(destination, path, data, **kwargs): self.assertEqual(destination, self.mock_perspective_server.server_name) @@ -410,9 +486,7 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): self.http_client.post_json.side_effect = post_json - return self.get_success( - fetcher.get_keys(server_name_and_key_ids) - ) + 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() @@ -435,6 +509,11 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): 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: @@ -445,14 +524,16 @@ def run_in_context(f, *args, **kwargs): defer.returnValue(rv) -def _verify_json_for_server(keyring, server_name, json_object): +def _verify_json_for_server(keyring, server_name, json_object, validity_time): """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 keyring.verify_json_for_server( + server_name, json_object, validity_time + ) defer.returnValue(rv1) return run_in_context(v) -- cgit 1.5.1 From def5ea4062295759d7c28d9c2302187871a1bc72 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff Date: Mon, 3 Jun 2019 15:36:41 +0100 Subject: Don't bomb out on direct key fetches as soon as one fails --- synapse/crypto/keyring.py | 58 +++++++++++++++++++++++++++----------------- tests/crypto/test_keyring.py | 12 ++++----- 2 files changed, 41 insertions(+), 29 deletions(-) (limited to 'tests/crypto/test_keyring.py') diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index bef6498f4b..5660c96023 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -46,6 +46,7 @@ from synapse.api.errors import ( ) from synapse.storage.keys import FetchKeyResult from synapse.util import logcontext, unwrapFirstError +from synapse.util.async_helpers import yieldable_gather_results from synapse.util.logcontext import ( LoggingContext, PreserveLoggingContext, @@ -169,7 +170,12 @@ class Keyring(object): ) ) - logger.debug("Verifying for %s with key_ids %s", server_name, key_ids) + logger.debug( + "Verifying for %s with key_ids %s, min_validity %i", + server_name, + key_ids, + validity_time, + ) # add the key request to the queue, but don't start it off yet. verify_request = VerifyKeyRequest( @@ -744,34 +750,42 @@ class ServerKeyFetcher(BaseV2KeyFetcher): self.clock = hs.get_clock() self.client = hs.get_http_client() - @defer.inlineCallbacks def get_keys(self, keys_to_fetch): """see KeyFetcher.get_keys""" - # TODO make this more resilient - results = yield logcontext.make_deferred_yieldable( - defer.gatherResults( - [ - run_in_background( - self.get_server_verify_key_v2_direct, - server_name, - server_keys.keys(), - ) - for server_name, server_keys in keys_to_fetch.items() - ], - consumeErrors=True, - ).addErrback(unwrapFirstError) - ) - merged = {} - for result in results: - merged.update(result) + results = {} + + @defer.inlineCallbacks + def get_key(key_to_fetch_item): + server_name, key_ids = key_to_fetch_item + try: + keys = yield self.get_server_verify_key_v2_direct(server_name, key_ids) + results[server_name] = keys + except KeyLookupError as e: + logger.warning( + "Error looking up keys %s from %s: %s", key_ids, server_name, e + ) + except Exception: + logger.exception("Error getting keys %s from %s", key_ids, server_name) - defer.returnValue( - {server_name: keys for server_name, keys in merged.items() if keys} + return yieldable_gather_results(get_key, keys_to_fetch.items()).addCallback( + lambda _: results ) @defer.inlineCallbacks def get_server_verify_key_v2_direct(self, server_name, key_ids): + """ + + Args: + server_name (str): + key_ids (iterable[str]): + + Returns: + Deferred[dict[str, FetchKeyResult]]: map from key ID to lookup result + + Raises: + KeyLookupError if there was a problem making the lookup + """ keys = {} # type: dict[str, FetchKeyResult] for requested_key_id in key_ids: @@ -823,7 +837,7 @@ class ServerKeyFetcher(BaseV2KeyFetcher): ) keys.update(response_keys) - defer.returnValue({server_name: keys}) + defer.returnValue(keys) @defer.inlineCallbacks diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py index 096401938d..4cff7e36c8 100644 --- a/tests/crypto/test_keyring.py +++ b/tests/crypto/test_keyring.py @@ -25,11 +25,7 @@ from twisted.internet import defer from synapse.api.errors import SynapseError from synapse.crypto import keyring -from synapse.crypto.keyring import ( - KeyLookupError, - PerspectivesKeyFetcher, - ServerKeyFetcher, -) +from synapse.crypto.keyring import PerspectivesKeyFetcher, ServerKeyFetcher from synapse.storage.keys import FetchKeyResult from synapse.util import logcontext from synapse.util.logcontext import LoggingContext @@ -364,9 +360,11 @@ class ServerKeyFetcherTestCase(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(fetcher.get_keys(keys_to_fetch), KeyLookupError) + + keys = self.get_success(fetcher.get_keys(keys_to_fetch)) + self.assertEqual(keys, {}) class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): -- cgit 1.5.1 From cea9750d112cf74790fb8c16482a0068717954d5 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff Date: Tue, 4 Jun 2019 16:12:57 +0100 Subject: Associate a request_name with each verify request, for logging Also: * rename VerifyKeyRequest->VerifyJsonRequest * calculate key_ids on VerifyJsonRequest construction * refactor things to pass around VerifyJsonRequests instead of 4-tuples --- changelog.d/5353.misc | 2 + synapse/crypto/keyring.py | 112 ++++++++++++++++++++------------- synapse/federation/federation_base.py | 2 + synapse/federation/transport/server.py | 4 +- synapse/groups/attestations.py | 4 +- tests/crypto/test_keyring.py | 18 +++--- 6 files changed, 86 insertions(+), 56 deletions(-) create mode 100644 changelog.d/5353.misc (limited to 'tests/crypto/test_keyring.py') diff --git a/changelog.d/5353.misc b/changelog.d/5353.misc new file mode 100644 index 0000000000..436245fb11 --- /dev/null +++ b/changelog.d/5353.misc @@ -0,0 +1,2 @@ +Various improvements to debug logging. + diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index e94e71bdad..2b6b5913bc 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -60,9 +60,9 @@ logger = logging.getLogger(__name__) @attr.s(slots=True, cmp=False) -class VerifyKeyRequest(object): +class VerifyJsonRequest(object): """ - A request for a verify key to verify a JSON object. + A request to verify a JSON object. Attributes: server_name(str): The name of the server to verify against. @@ -85,11 +85,15 @@ class VerifyKeyRequest(object): """ server_name = attr.ib() - key_ids = attr.ib() json_object = attr.ib() minimum_valid_until_ts = attr.ib() + request_name = attr.ib() + key_ids = attr.ib(init=False) key_ready = attr.ib(default=attr.Factory(defer.Deferred)) + def __attrs_post_init__(self): + self.key_ids = signature_ids(self.json_object, self.server_name) + class KeyLookupError(ValueError): pass @@ -114,7 +118,9 @@ class Keyring(object): # These are regular, logcontext-agnostic Deferreds. self.key_downloads = {} - def verify_json_for_server(self, server_name, json_object, validity_time): + def verify_json_for_server( + self, server_name, json_object, validity_time, request_name + ): """Verify that a JSON object has been signed by a given server Args: @@ -125,24 +131,31 @@ class Keyring(object): validity_time (int): timestamp at which we require the signing key to be valid. (0 implies we don't care) + request_name (str): an identifier for this json object (eg, an event id) + for logging. + Returns: Deferred[None]: completes if the the object was correctly signed, otherwise errbacks with an error """ - req = server_name, json_object, validity_time - - return logcontext.make_deferred_yieldable( - self.verify_json_objects_for_server((req,))[0] - ) + req = VerifyJsonRequest(server_name, json_object, validity_time, request_name) + requests = (req,) + return logcontext.make_deferred_yieldable(self._verify_objects(requests)[0]) def verify_json_objects_for_server(self, server_and_json): """Bulk verifies signatures of json objects, bulk fetching keys as necessary. Args: - server_and_json (iterable[Tuple[str, dict, int]): - Iterable of triplets of (server_name, json_object, validity_time) - validity_time is a timestamp at which the signing key must be valid. + server_and_json (iterable[Tuple[str, dict, int, str]): + Iterable of (server_name, json_object, validity_time, request_name) + tuples. + + validity_time is a timestamp at which the signing key must be + valid. + + request_name is an identifier for this json object (eg, an event id) + for logging. Returns: List: for each input triplet, a deferred indicating success @@ -150,38 +163,54 @@ class Keyring(object): server_name. The deferreds run their callbacks in the sentinel logcontext. """ - # a list of VerifyKeyRequests - verify_requests = [] + return self._verify_objects( + VerifyJsonRequest(server_name, json_object, validity_time, request_name) + for server_name, json_object, validity_time, request_name in server_and_json + ) + + def _verify_objects(self, verify_requests): + """Does the work of verify_json_[objects_]for_server + + + Args: + verify_requests (iterable[VerifyJsonRequest]): + Iterable of verification requests. + + Returns: + List: for each input item, a deferred indicating success + or failure to verify each json object's signature for the given + server_name. The deferreds run their callbacks in the sentinel + logcontext. + """ + # a list of VerifyJsonRequests which are awaiting a key lookup + key_lookups = [] handle = preserve_fn(_handle_key_deferred) - def process(server_name, json_object, validity_time): + def process(verify_request): """Process an entry in the request list - Given a (server_name, json_object, validity_time) triplet from the request - list, adds a key request to verify_requests, and returns a deferred which + Adds a key request to key_lookups, and returns a deferred which will complete or fail (in the sentinel context) when verification completes. """ - key_ids = signature_ids(json_object, server_name) - - if not key_ids: + if not verify_request.key_ids: return defer.fail( SynapseError( - 400, "Not signed by %s" % (server_name,), Codes.UNAUTHORIZED + 400, + "Not signed by %s" % (verify_request.server_name,), + Codes.UNAUTHORIZED, ) ) logger.debug( - "Verifying for %s with key_ids %s, min_validity %i", - server_name, - key_ids, - validity_time, + "Verifying %s for %s with key_ids %s, min_validity %i", + verify_request.request_name, + verify_request.server_name, + verify_request.key_ids, + verify_request.minimum_valid_until_ts, ) # add the key request to the queue, but don't start it off yet. - verify_request = VerifyKeyRequest( - server_name, key_ids, json_object, validity_time - ) - verify_requests.append(verify_request) + key_lookups.append(verify_request) # now run _handle_key_deferred, which will wait for the key request # to complete and then do the verification. @@ -190,13 +219,10 @@ class Keyring(object): # wrap it with preserve_fn (aka run_in_background) return handle(verify_request) - results = [ - process(server_name, json_object, validity_time) - for server_name, json_object, validity_time in server_and_json - ] + results = [process(r) for r in verify_requests] - if verify_requests: - run_in_background(self._start_key_lookups, verify_requests) + if key_lookups: + run_in_background(self._start_key_lookups, key_lookups) return results @@ -207,7 +233,7 @@ class Keyring(object): Once each fetch completes, verify_request.key_ready will be resolved. Args: - verify_requests (List[VerifyKeyRequest]): + verify_requests (List[VerifyJsonRequest]): """ try: @@ -308,7 +334,7 @@ class Keyring(object): with a SynapseError if none of the keys are found. Args: - verify_requests (list[VerifyKeyRequest]): list of verify requests + verify_requests (list[VerifyJsonRequest]): list of verify requests """ remaining_requests = set( @@ -357,7 +383,7 @@ class Keyring(object): Args: fetcher (KeyFetcher): fetcher to use to fetch the keys - remaining_requests (set[VerifyKeyRequest]): outstanding key requests. + remaining_requests (set[VerifyJsonRequest]): outstanding key requests. Any successfully-completed requests will be removed from the list. """ # dict[str, dict[str, int]]: keys to fetch. @@ -376,7 +402,7 @@ class Keyring(object): # the requests. keys_for_server[key_id] = max( keys_for_server.get(key_id, -1), - verify_request.minimum_valid_until_ts + verify_request.minimum_valid_until_ts, ) results = yield fetcher.get_keys(missing_keys) @@ -386,7 +412,7 @@ class Keyring(object): server_name = verify_request.server_name # see if any of the keys we got this time are sufficient to - # complete this VerifyKeyRequest. + # complete this VerifyJsonRequest. result_keys = results.get(server_name, {}) for key_id in verify_request.key_ids: fetch_key_result = result_keys.get(key_id) @@ -454,9 +480,7 @@ class BaseV2KeyFetcher(object): self.config = hs.get_config() @defer.inlineCallbacks - def process_v2_response( - self, from_server, response_json, time_added_ms - ): + def process_v2_response(self, from_server, response_json, time_added_ms): """Parse a 'Server Keys' structure from the result of a /key request This is used to parse either the entirety of the response from @@ -852,7 +876,7 @@ def _handle_key_deferred(verify_request): """Waits for the key to become available, and then performs a verification Args: - verify_request (VerifyKeyRequest): + verify_request (VerifyJsonRequest): Returns: Deferred[None] diff --git a/synapse/federation/federation_base.py b/synapse/federation/federation_base.py index b541913d82..fc5cfb7d83 100644 --- a/synapse/federation/federation_base.py +++ b/synapse/federation/federation_base.py @@ -271,6 +271,7 @@ def _check_sigs_on_pdus(keyring, room_version, pdus): p.sender_domain, p.redacted_pdu_json, p.pdu.origin_server_ts if v.enforce_key_validity else 0, + p.pdu.event_id, ) for p in pdus_to_check_sender ] @@ -306,6 +307,7 @@ def _check_sigs_on_pdus(keyring, room_version, pdus): get_domain_from_id(p.pdu.event_id), p.redacted_pdu_json, p.pdu.origin_server_ts if v.enforce_key_validity else 0, + p.pdu.event_id, ) for p in pdus_to_check_event_id ] diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py index 0db8858cf1..949a5fb2aa 100644 --- a/synapse/federation/transport/server.py +++ b/synapse/federation/transport/server.py @@ -140,7 +140,9 @@ class Authenticator(object): 401, "Missing Authorization headers", Codes.UNAUTHORIZED, ) - yield self.keyring.verify_json_for_server(origin, json_request, now) + yield self.keyring.verify_json_for_server( + origin, json_request, now, "Incoming request" + ) logger.info("Request from %s", origin) request.authenticated_entity = origin diff --git a/synapse/groups/attestations.py b/synapse/groups/attestations.py index fa6b641ee1..e5dda1975f 100644 --- a/synapse/groups/attestations.py +++ b/synapse/groups/attestations.py @@ -101,7 +101,9 @@ class GroupAttestationSigning(object): if valid_until_ms < now: raise SynapseError(400, "Attestation expired") - yield self.keyring.verify_json_for_server(server_name, attestation, now) + yield self.keyring.verify_json_for_server( + server_name, attestation, now, "Group attestation" + ) def create_attestation(self, group_id, user_id): """Create an attestation for the group_id and user_id with default diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py index 4cff7e36c8..18121f4f6c 100644 --- a/tests/crypto/test_keyring.py +++ b/tests/crypto/test_keyring.py @@ -134,7 +134,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): context_11.request = "11" res_deferreds = kr.verify_json_objects_for_server( - [("server10", json1, 0), ("server11", {}, 0)] + [("server10", json1, 0, "test10"), ("server11", {}, 0, "test11")] ) # the unsigned json should be rejected pretty quickly @@ -171,7 +171,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): self.http_client.post_json.return_value = defer.Deferred() res_deferreds_2 = kr.verify_json_objects_for_server( - [("server10", json1, 0)] + [("server10", json1, 0, "test")] ) res_deferreds_2[0].addBoth(self.check_context, None) yield logcontext.make_deferred_yieldable(res_deferreds_2[0]) @@ -205,11 +205,11 @@ class KeyringTestCase(unittest.HomeserverTestCase): signedjson.sign.sign_json(json1, "server9", key1) # should fail immediately on an unsigned object - d = _verify_json_for_server(kr, "server9", {}, 0) + 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) + d = _verify_json_for_server(kr, "server9", json1, 500, "test signed") # self.assertFalse(d.called) self.get_success(d) @@ -239,7 +239,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): # the first request should succeed; the second should fail because the key # has expired results = kr.verify_json_objects_for_server( - [("server1", json1, 500), ("server1", json1, 1500)] + [("server1", json1, 500, "test1"), ("server1", json1, 1500, "test2")] ) self.assertEqual(len(results), 2) self.get_success(results[0]) @@ -284,7 +284,7 @@ class KeyringTestCase(unittest.HomeserverTestCase): signedjson.sign.sign_json(json1, "server1", key1) results = kr.verify_json_objects_for_server( - [("server1", json1, 1200), ("server1", json1, 1500)] + [("server1", json1, 1200, "test1"), ("server1", json1, 1500, "test2")] ) self.assertEqual(len(results), 2) self.get_success(results[0]) @@ -522,16 +522,14 @@ def run_in_context(f, *args, **kwargs): defer.returnValue(rv) -def _verify_json_for_server(keyring, server_name, json_object, validity_time): +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, validity_time - ) + rv1 = yield kr.verify_json_for_server(*args) defer.returnValue(rv1) return run_in_context(v) -- cgit 1.5.1 From 9fbb20a531161652143028cde333429fe03b0343 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff <1389908+richvdh@users.noreply.github.com> Date: Thu, 6 Jun 2019 17:33:11 +0100 Subject: Stop hardcoding trust of old matrix.org key (#5374) 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. --- changelog.d/5374.feature | 1 + docs/sample_config.yaml | 43 +++- synapse/config/key.py | 228 +++++++++++++++++---- synapse/crypto/keyring.py | 72 +++---- tests/crypto/test_keyring.py | 43 ++-- .../federation/test_matrix_federation_agent.py | 1 + 6 files changed, 293 insertions(+), 95 deletions(-) create mode 100644 changelog.d/5374.feature (limited to 'tests/crypto/test_keyring.py') diff --git a/changelog.d/5374.feature b/changelog.d/5374.feature new file mode 100644 index 0000000000..17937637ab --- /dev/null +++ b/changelog.d/5374.feature @@ -0,0 +1 @@ +Replace the `perspectives` configuration section with `trusted_key_servers`, and make validating the signatures on responses optional (since TLS will do this job for us). diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml index 2f37e71601..a2e815ea52 100644 --- a/docs/sample_config.yaml +++ b/docs/sample_config.yaml @@ -952,12 +952,43 @@ signing_key_path: "CONFDIR/SERVERNAME.signing.key" # The trusted servers to download signing keys from. # -#perspectives: -# servers: -# "matrix.org": -# verify_keys: -# "ed25519:auto": -# key: "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw" +# When we need to fetch a signing key, each server is tried in parallel. +# +# Normally, the connection to the key server is validated via TLS certificates. +# Additional security can be provided by configuring a `verify key`, which +# will make synapse check that the response is signed by that key. +# +# This setting supercedes an older setting named `perspectives`. The old format +# is still supported for backwards-compatibility, but it is deprecated. +# +# Options for each entry in the list include: +# +# server_name: the name of the server. required. +# +# verify_keys: an optional map from key id to base64-encoded public key. +# If specified, we will check that the response is signed by at least +# one of the given keys. +# +# accept_keys_insecurely: a boolean. Normally, if `verify_keys` is unset, +# and federation_verify_certificates is not `true`, synapse will refuse +# to start, because this would allow anyone who can spoof DNS responses +# to masquerade as the trusted key server. If you know what you are doing +# and are sure that your network environment provides a secure connection +# to the key server, you can set this to `true` to override this +# behaviour. +# +# An example configuration might look like: +# +#trusted_key_servers: +# - server_name: "my_trusted_server.example.com" +# verify_keys: +# "ed25519:auto": "abcdefghijklmnopqrstuvwxyzabcdefghijklmopqr" +# - server_name: "my_other_trusted_server.example.com" +# +# The default configuration is: +# +#trusted_key_servers: +# - server_name: "matrix.org" # Enable SAML2 for registration and login. Uses pysaml2. diff --git a/synapse/config/key.py b/synapse/config/key.py index eb10259818..aba7092ccd 100644 --- a/synapse/config/key.py +++ b/synapse/config/key.py @@ -1,5 +1,6 @@ # -*- coding: utf-8 -*- # Copyright 2015, 2016 OpenMarket Ltd +# Copyright 2019 The Matrix.org Foundation C.I.C. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -17,6 +18,8 @@ import hashlib import logging import os +import attr +import jsonschema from signedjson.key import ( NACL_ED25519, decode_signing_key_base64, @@ -32,11 +35,27 @@ from synapse.util.stringutils import random_string, random_string_with_symbols from ._base import Config, ConfigError +INSECURE_NOTARY_ERROR = """\ +Your server is configured to accept key server responses without signature +validation or TLS certificate validation. This is likely to be very insecure. If +you are *sure* you want to do this, set 'accept_keys_insecurely' on the +keyserver configuration.""" + + logger = logging.getLogger(__name__) -class KeyConfig(Config): +@attr.s +class TrustedKeyServer(object): + # string: name of the server. + server_name = attr.ib() + # dict[str,VerifyKey]|None: map from key id to key object, or None to disable + # signature verification. + verify_keys = attr.ib(default=None) + + +class KeyConfig(Config): def read_config(self, config): # the signing key can be specified inline or in a separate file if "signing_key" in config: @@ -49,16 +68,27 @@ class KeyConfig(Config): config.get("old_signing_keys", {}) ) self.key_refresh_interval = self.parse_duration( - config.get("key_refresh_interval", "1d"), + config.get("key_refresh_interval", "1d") ) - self.perspectives = self.read_perspectives( - config.get("perspectives", {}).get("servers", { - "matrix.org": {"verify_keys": { - "ed25519:auto": { - "key": "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw", - } - }} - }) + + # if neither trusted_key_servers nor perspectives are given, use the default. + if "perspectives" not in config and "trusted_key_servers" not in config: + key_servers = [{"server_name": "matrix.org"}] + else: + key_servers = config.get("trusted_key_servers", []) + + if not isinstance(key_servers, list): + raise ConfigError( + "trusted_key_servers, if given, must be a list, not a %s" + % (type(key_servers).__name__,) + ) + + # merge the 'perspectives' config into the 'trusted_key_servers' config. + key_servers.extend(_perspectives_to_key_servers(config)) + + # list of TrustedKeyServer objects + self.key_servers = list( + _parse_key_servers(key_servers, self.federation_verify_certificates) ) self.macaroon_secret_key = config.get( @@ -78,8 +108,9 @@ class KeyConfig(Config): # falsification of values self.form_secret = config.get("form_secret", None) - def default_config(self, config_dir_path, server_name, generate_secrets=False, - **kwargs): + def default_config( + self, config_dir_path, server_name, generate_secrets=False, **kwargs + ): base_key_name = os.path.join(config_dir_path, server_name) if generate_secrets: @@ -91,7 +122,8 @@ class KeyConfig(Config): macaroon_secret_key = "# macaroon_secret_key: " form_secret = "# form_secret: " - return """\ + return ( + """\ # a secret which is used to sign access tokens. If none is specified, # the registration_shared_secret is used, if one is given; otherwise, # a secret key is derived from the signing key. @@ -133,33 +165,53 @@ class KeyConfig(Config): # The trusted servers to download signing keys from. # - #perspectives: - # servers: - # "matrix.org": - # verify_keys: - # "ed25519:auto": - # key: "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw" - """ % locals() - - def read_perspectives(self, perspectives_servers): - servers = {} - for server_name, server_config in perspectives_servers.items(): - for key_id, key_data in server_config["verify_keys"].items(): - if is_signing_algorithm_supported(key_id): - key_base64 = key_data["key"] - key_bytes = decode_base64(key_base64) - verify_key = decode_verify_key_bytes(key_id, key_bytes) - servers.setdefault(server_name, {})[key_id] = verify_key - return servers + # When we need to fetch a signing key, each server is tried in parallel. + # + # Normally, the connection to the key server is validated via TLS certificates. + # Additional security can be provided by configuring a `verify key`, which + # will make synapse check that the response is signed by that key. + # + # This setting supercedes an older setting named `perspectives`. The old format + # is still supported for backwards-compatibility, but it is deprecated. + # + # Options for each entry in the list include: + # + # server_name: the name of the server. required. + # + # verify_keys: an optional map from key id to base64-encoded public key. + # If specified, we will check that the response is signed by at least + # one of the given keys. + # + # accept_keys_insecurely: a boolean. Normally, if `verify_keys` is unset, + # and federation_verify_certificates is not `true`, synapse will refuse + # to start, because this would allow anyone who can spoof DNS responses + # to masquerade as the trusted key server. If you know what you are doing + # and are sure that your network environment provides a secure connection + # to the key server, you can set this to `true` to override this + # behaviour. + # + # An example configuration might look like: + # + #trusted_key_servers: + # - server_name: "my_trusted_server.example.com" + # verify_keys: + # "ed25519:auto": "abcdefghijklmnopqrstuvwxyzabcdefghijklmopqr" + # - server_name: "my_other_trusted_server.example.com" + # + # The default configuration is: + # + #trusted_key_servers: + # - server_name: "matrix.org" + """ + % locals() + ) def read_signing_key(self, signing_key_path): signing_keys = self.read_file(signing_key_path, "signing_key") try: return read_signing_keys(signing_keys.splitlines(True)) except Exception as e: - raise ConfigError( - "Error reading signing_key: %s" % (str(e)) - ) + raise ConfigError("Error reading signing_key: %s" % (str(e))) def read_old_signing_keys(self, old_signing_keys): keys = {} @@ -182,9 +234,7 @@ class KeyConfig(Config): if not self.path_exists(signing_key_path): with open(signing_key_path, "w") as signing_key_file: key_id = "a_" + random_string(4) - write_signing_keys( - signing_key_file, (generate_signing_key(key_id),), - ) + write_signing_keys(signing_key_file, (generate_signing_key(key_id),)) else: signing_keys = self.read_file(signing_key_path, "signing_key") if len(signing_keys.split("\n")[0].split()) == 1: @@ -194,6 +244,106 @@ class KeyConfig(Config): NACL_ED25519, key_id, signing_keys.split("\n")[0] ) with open(signing_key_path, "w") as signing_key_file: - write_signing_keys( - signing_key_file, (key,), + write_signing_keys(signing_key_file, (key,)) + + +def _perspectives_to_key_servers(config): + """Convert old-style 'perspectives' configs into new-style 'trusted_key_servers' + + Returns an iterable of entries to add to trusted_key_servers. + """ + + # 'perspectives' looks like: + # + # { + # "servers": { + # "matrix.org": { + # "verify_keys": { + # "ed25519:auto": { + # "key": "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw" + # } + # } + # } + # } + # } + # + # 'trusted_keys' looks like: + # + # [ + # { + # "server_name": "matrix.org", + # "verify_keys": { + # "ed25519:auto": "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw", + # } + # } + # ] + + perspectives_servers = config.get("perspectives", {}).get("servers", {}) + + for server_name, server_opts in perspectives_servers.items(): + trusted_key_server_entry = {"server_name": server_name} + verify_keys = server_opts.get("verify_keys") + if verify_keys is not None: + trusted_key_server_entry["verify_keys"] = { + key_id: key_data["key"] for key_id, key_data in verify_keys.items() + } + yield trusted_key_server_entry + + +TRUSTED_KEY_SERVERS_SCHEMA = { + "$schema": "http://json-schema.org/draft-04/schema#", + "description": "schema for the trusted_key_servers setting", + "type": "array", + "items": { + "type": "object", + "properties": { + "server_name": {"type": "string"}, + "verify_keys": { + "type": "object", + # each key must be a base64 string + "additionalProperties": {"type": "string"}, + }, + }, + "required": ["server_name"], + }, +} + + +def _parse_key_servers(key_servers, federation_verify_certificates): + try: + jsonschema.validate(key_servers, TRUSTED_KEY_SERVERS_SCHEMA) + except jsonschema.ValidationError as e: + raise ConfigError("Unable to parse 'trusted_key_servers': " + e.message) + + for server in key_servers: + server_name = server["server_name"] + result = TrustedKeyServer(server_name=server_name) + + verify_keys = server.get("verify_keys") + if verify_keys is not None: + result.verify_keys = {} + for key_id, key_base64 in verify_keys.items(): + if not is_signing_algorithm_supported(key_id): + raise ConfigError( + "Unsupported signing algorithm on key %s for server %s in " + "trusted_key_servers" % (key_id, server_name) ) + try: + key_bytes = decode_base64(key_base64) + verify_key = decode_verify_key_bytes(key_id, key_bytes) + except Exception as e: + raise ConfigError( + "Unable to parse key %s for server %s in " + "trusted_key_servers: %s" % (key_id, server_name, e) + ) + + result.verify_keys[key_id] = verify_key + + if ( + not verify_keys + and not server.get("accept_keys_insecurely") + and not federation_verify_certificates + ): + raise ConfigError(INSECURE_NOTARY_ERROR) + + yield result diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index 2b6b5913bc..96964b0d50 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -585,25 +585,27 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): super(PerspectivesKeyFetcher, self).__init__(hs) self.clock = hs.get_clock() self.client = hs.get_http_client() - self.perspective_servers = self.config.perspectives + self.key_servers = self.config.key_servers @defer.inlineCallbacks def get_keys(self, keys_to_fetch): """see KeyFetcher.get_keys""" @defer.inlineCallbacks - def get_key(perspective_name, perspective_keys): + def get_key(key_server): try: result = yield self.get_server_verify_key_v2_indirect( - keys_to_fetch, perspective_name, perspective_keys + keys_to_fetch, key_server ) defer.returnValue(result) except KeyLookupError as e: - logger.warning("Key lookup failed from %r: %s", perspective_name, e) + logger.warning( + "Key lookup failed from %r: %s", key_server.server_name, e + ) except Exception as e: logger.exception( "Unable to get key from %r: %s %s", - perspective_name, + key_server.server_name, type(e).__name__, str(e), ) @@ -613,8 +615,8 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): results = yield logcontext.make_deferred_yieldable( defer.gatherResults( [ - run_in_background(get_key, p_name, p_keys) - for p_name, p_keys in self.perspective_servers.items() + run_in_background(get_key, server) + for server in self.key_servers ], consumeErrors=True, ).addErrback(unwrapFirstError) @@ -629,17 +631,15 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): @defer.inlineCallbacks def get_server_verify_key_v2_indirect( - self, keys_to_fetch, perspective_name, perspective_keys + self, keys_to_fetch, key_server ): """ Args: keys_to_fetch (dict[str, dict[str, int]]): the keys to be fetched. server_name -> key_id -> min_valid_ts - perspective_name (str): name of the notary server to query for the keys - - perspective_keys (dict[str, VerifyKey]): map of key_id->key for the - notary server + key_server (synapse.config.key.TrustedKeyServer): notary server to query for + the keys Returns: Deferred[dict[str, dict[str, synapse.storage.keys.FetchKeyResult]]]: map @@ -649,6 +649,7 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): KeyLookupError if there was an error processing the entire response from the server """ + perspective_name = key_server.server_name logger.info( "Requesting keys %s from notary server %s", keys_to_fetch.items(), @@ -689,11 +690,13 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): ) try: - processed_response = yield self._process_perspectives_response( - perspective_name, - perspective_keys, + self._validate_perspectives_response( + key_server, response, - time_added_ms=time_now_ms, + ) + + processed_response = yield self.process_v2_response( + perspective_name, response, time_added_ms=time_now_ms ) except KeyLookupError as e: logger.warning( @@ -717,28 +720,24 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): defer.returnValue(keys) - def _process_perspectives_response( - self, perspective_name, perspective_keys, response, time_added_ms + def _validate_perspectives_response( + self, key_server, response, ): - """Parse a 'Server Keys' structure from the result of a /key/query request - - Checks that the entry is correctly signed by the perspectives server, and then - passes over to process_v2_response + """Optionally check the signature on the result of a /key/query request Args: - perspective_name (str): the name of the notary server that produced this - result - - perspective_keys (dict[str, VerifyKey]): map of key_id->key for the - notary server + key_server (synapse.config.key.TrustedKeyServer): the notary server that + produced this result response (dict): the json-decoded Server Keys response object + """ + perspective_name = key_server.server_name + perspective_keys = key_server.verify_keys - time_added_ms (int): the timestamp to record in server_keys_json + if perspective_keys is None: + # signature checking is disabled on this server + return - Returns: - Deferred[dict[str, FetchKeyResult]]: map from key_id to result object - """ if ( u"signatures" not in response or perspective_name not in response[u"signatures"] @@ -751,6 +750,13 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): verify_signed_json(response, perspective_name, perspective_keys[key_id]) verified = True + if perspective_name == "matrix.org" and key_id == "ed25519:auto": + logger.warning( + "Trusting trusted_key_server responses signed by the " + "compromised matrix.org signing key 'ed25519:auto'. " + "This is a placebo." + ) + if not verified: raise KeyLookupError( "Response not signed with a known key: signed with: %r, known keys: %r" @@ -760,10 +766,6 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): ) ) - return self.process_v2_response( - perspective_name, response, time_added_ms=time_added_ms - ) - class ServerKeyFetcher(BaseV2KeyFetcher): """KeyFetcher impl which fetches keys from the origin servers""" diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py index 18121f4f6c..4b1901ce31 100644 --- a/tests/crypto/test_keyring.py +++ b/tests/crypto/test_keyring.py @@ -19,7 +19,7 @@ from mock import Mock import canonicaljson import signedjson.key import signedjson.sign -from signedjson.key import get_verify_key +from signedjson.key import encode_verify_key_base64, get_verify_key from twisted.internet import defer @@ -40,7 +40,7 @@ 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) @@ -48,9 +48,7 @@ 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)}}, } self.sign_response(res) return res @@ -63,10 +61,18 @@ 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( @@ -371,10 +377,18 @@ class PerspectivesKeyFetcherTestCase(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 test_get_keys_from_perspectives(self): # arbitrarily advance the clock a bit @@ -439,8 +453,7 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): self.assertEqual(res["ts_valid_until_ms"], VALID_UNTIL_TS) self.assertEqual( - bytes(res["key_json"]), - canonicaljson.encode_canonical_json(response), + bytes(res["key_json"]), canonicaljson.encode_canonical_json(response) ) def test_invalid_perspectives_responses(self): diff --git a/tests/http/federation/test_matrix_federation_agent.py b/tests/http/federation/test_matrix_federation_agent.py index 4153da4da7..05880a1048 100644 --- a/tests/http/federation/test_matrix_federation_agent.py +++ b/tests/http/federation/test_matrix_federation_agent.py @@ -57,6 +57,7 @@ class MatrixFederationAgentTests(TestCase): # present will not be trusted. We should do better here, though. config_dict = default_config("test", parse=False) config_dict["federation_verify_certificates"] = False + config_dict["trusted_key_servers"] = [] config = HomeServerConfig() config.parse_config_dict(config_dict) -- cgit 1.5.1 From 43badd2cd4315c3f3ed45b0092c4479a43a3eb52 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Mon, 10 Jun 2019 14:31:05 +0100 Subject: Fix key verification when key stored with null valid_until_ms Some keys are stored in the synapse database with a null valid_until_ms which caused an exception to be thrown when using that key. We fix this by treating nulls as zeroes, i.e. they keys will match verification requests with a minimum_valid_until_ms of zero (i.e. don't validate ts) but will not match requests with a non-zero minimum_valid_until_ms. Fixes #5391. --- synapse/storage/keys.py | 8 +++++++ tests/crypto/test_keyring.py | 50 +++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 57 insertions(+), 1 deletion(-) (limited to 'tests/crypto/test_keyring.py') diff --git a/synapse/storage/keys.py b/synapse/storage/keys.py index 5300720dbb..e3655ad8d7 100644 --- a/synapse/storage/keys.py +++ b/synapse/storage/keys.py @@ -80,6 +80,14 @@ class KeyStore(SQLBaseStore): for row in txn: server_name, key_id, key_bytes, ts_valid_until_ms = row + + if ts_valid_until_ms is None: + # Old keys may be stored with a ts_valid_until_ms of null, + # in which case we treat this as if it was set to `0`, i.e. + # it won't match key requests that define a minimum + # `ts_valid_until_ms`. + ts_valid_until_ms = 0 + res = FetchKeyResult( verify_key=decode_verify_key_bytes(key_id, bytes(key_bytes)), valid_until_ts=ts_valid_until_ms, diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py index 4b1901ce31..5a355f00cc 100644 --- a/tests/crypto/test_keyring.py +++ b/tests/crypto/test_keyring.py @@ -25,7 +25,11 @@ from twisted.internet import defer from synapse.api.errors import SynapseError from synapse.crypto import keyring -from synapse.crypto.keyring import PerspectivesKeyFetcher, ServerKeyFetcher +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 @@ -219,6 +223,50 @@ class KeyringTestCase(unittest.HomeserverTestCase): # 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", {}, 0, "test unsigned") + self.failureResultOf(d, SynapseError) + + # 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) -- cgit 1.5.1