diff options
Diffstat (limited to 'synapse/crypto/keyring.py')
| -rw-r--r-- | synapse/crypto/keyring.py | 105 |
1 files changed, 77 insertions, 28 deletions
diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index a64ba0752a..65af2fb671 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -17,6 +17,7 @@ import logging from collections import namedtuple +import six from six import raise_from from six.moves import urllib @@ -349,6 +350,7 @@ class KeyFetcher(object): Args: server_name_and_key_ids (iterable[Tuple[str, iterable[str]]]): list of (server_name, iterable[key_id]) tuples to fetch keys for + Note that the iterables may be iterated more than once. Returns: Deferred[dict[str, dict[str, synapse.storage.keys.FetchKeyResult|None]]]: @@ -557,7 +559,16 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): Returns: Deferred[dict[str, dict[str, synapse.storage.keys.FetchKeyResult]]]: map from server_name -> key_id -> FetchKeyResult + + Raises: + KeyLookupError if there was an error processing the entire response from + the server """ + logger.info( + "Requesting keys %s from notary server %s", + server_names_and_key_ids, + perspective_name, + ) # TODO(mark): Set the minimum_valid_until_ts to that needed by # the events being validated or the current time if validating # an incoming request. @@ -586,40 +597,31 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): time_now_ms = self.clock.time_msec() for response in query_response["server_keys"]: - if ( - u"signatures" not in response - or perspective_name not in response[u"signatures"] - ): + # do this first, so that we can give useful errors thereafter + server_name = response.get("server_name") + if not isinstance(server_name, six.string_types): raise KeyLookupError( - "Key response not signed by perspective server" - " %r" % (perspective_name,) + "Malformed response from key notary server %s: invalid server_name" + % (perspective_name,) ) - verified = False - for key_id in response[u"signatures"][perspective_name]: - if key_id in perspective_keys: - verify_signed_json( - response, perspective_name, perspective_keys[key_id] - ) - verified = True - - if not verified: - logging.info( - "Response from perspective server %r not signed with a" - " known key, signed with: %r, known keys: %r", + try: + processed_response = yield self._process_perspectives_response( perspective_name, - list(response[u"signatures"][perspective_name]), - list(perspective_keys), + perspective_keys, + response, + time_added_ms=time_now_ms, ) - raise KeyLookupError( - "Response not signed with a known key for perspective" - " server %r" % (perspective_name,) + except KeyLookupError as e: + logger.warning( + "Error processing response from key notary server %s for origin " + "server %s: %s", + perspective_name, + server_name, + e, ) - - processed_response = yield self.process_v2_response( - perspective_name, response, time_added_ms=time_now_ms - ) - server_name = response["server_name"] + # we continue to process the rest of the response + continue added_keys.extend( (server_name, key_id, key) for key_id, key in processed_response.items() @@ -632,6 +634,53 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): defer.returnValue(keys) + def _process_perspectives_response( + self, perspective_name, perspective_keys, response, time_added_ms + ): + """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 + + 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 + + response (dict): the json-decoded Server Keys response object + + time_added_ms (int): the timestamp to record in server_keys_json + + 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"] + ): + raise KeyLookupError("Response not signed by the notary server") + + verified = False + for key_id in response[u"signatures"][perspective_name]: + if key_id in perspective_keys: + verify_signed_json(response, perspective_name, perspective_keys[key_id]) + verified = True + + if not verified: + raise KeyLookupError( + "Response not signed with a known key: signed with: %r, known keys: %r" + % ( + list(response[u"signatures"][perspective_name].keys()), + list(perspective_keys.keys()), + ) + ) + + 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""" |