diff options
Diffstat (limited to 'synapse/federation/federation_server.py')
| -rw-r--r-- | synapse/federation/federation_server.py | 115 |
1 files changed, 90 insertions, 25 deletions
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py index 0f9302a6a8..569eb277a9 100644 --- a/synapse/federation/federation_server.py +++ b/synapse/federation/federation_server.py @@ -25,15 +25,17 @@ from twisted.internet import defer from twisted.internet.abstract import isIPAddress from twisted.python import failure -from synapse.api.constants import EventTypes +from synapse.api.constants import KNOWN_ROOM_VERSIONS, EventTypes, Membership from synapse.api.errors import ( AuthError, + Codes, FederationError, IncompatibleRoomVersionError, NotFoundError, SynapseError, ) from synapse.crypto.event_signing import compute_event_signature +from synapse.events import room_version_to_event_format from synapse.federation.federation_base import FederationBase, event_from_pdu_json from synapse.federation.persistence import TransactionActions from synapse.federation.units import Edu, Transaction @@ -147,6 +149,22 @@ class FederationServer(FederationBase): logger.debug("[%s] Transaction is new", transaction.transaction_id) + # Reject if PDU count > 50 and EDU count > 100 + if (len(transaction.pdus) > 50 + or (hasattr(transaction, "edus") and len(transaction.edus) > 100)): + + logger.info( + "Transaction PDU or EDU count too large. Returning 400", + ) + + response = {} + yield self.transaction_actions.set_response( + origin, + transaction, + 400, response + ) + defer.returnValue((400, response)) + received_pdus_counter.inc(len(transaction.pdus)) origin_host, _ = parse_server_name(origin) @@ -162,8 +180,29 @@ class FederationServer(FederationBase): p["age_ts"] = request_time - int(p["age"]) del p["age"] - event = event_from_pdu_json(p) - room_id = event.room_id + # We try and pull out an event ID so that if later checks fail we + # can log something sensible. We don't mandate an event ID here in + # case future event formats get rid of the key. + possible_event_id = p.get("event_id", "<Unknown>") + + # Now we get the room ID so that we can check that we know the + # version of the room. + room_id = p.get("room_id") + if not room_id: + logger.info( + "Ignoring PDU as does not have a room_id. Event ID: %s", + possible_event_id, + ) + continue + + try: + room_version = yield self.store.get_room_version(room_id) + format_ver = room_version_to_event_format(room_version) + except NotFoundError: + logger.info("Ignoring PDU for unknown room_id: %s", room_id) + continue + + event = event_from_pdu_json(p, format_ver) pdus_by_room.setdefault(room_id, []).append(event) pdu_results = {} @@ -201,8 +240,9 @@ class FederationServer(FederationBase): f = failure.Failure() pdu_results[event_id] = {"error": str(e)} logger.error( - "Failed to handle PDU %s: %s", - event_id, f.getTraceback().rstrip(), + "Failed to handle PDU %s", + event_id, + exc_info=(f.type, f.value, f.getTracebackObject()), ) yield concurrently_execute( @@ -300,7 +340,7 @@ class FederationServer(FederationBase): if self.hs.is_mine_id(event.event_id): event.signatures.update( compute_event_signature( - event, + event.get_pdu_json(), self.hs.hostname, self.hs.config.signing_key[0] ) @@ -324,11 +364,6 @@ class FederationServer(FederationBase): defer.returnValue((404, "")) @defer.inlineCallbacks - @log_function - def on_pull_request(self, origin, versions): - raise NotImplementedError("Pull transactions not implemented") - - @defer.inlineCallbacks def on_query_request(self, query_type, args): received_queries_counter.labels(query_type).inc() resp = yield self.registry.on_query(query_type, args) @@ -352,18 +387,30 @@ class FederationServer(FederationBase): }) @defer.inlineCallbacks - def on_invite_request(self, origin, content): - pdu = event_from_pdu_json(content) + def on_invite_request(self, origin, content, room_version): + if room_version not in KNOWN_ROOM_VERSIONS: + raise SynapseError( + 400, + "Homeserver does not support this room version", + Codes.UNSUPPORTED_ROOM_VERSION, + ) + + format_ver = room_version_to_event_format(room_version) + + pdu = event_from_pdu_json(content, format_ver) origin_host, _ = parse_server_name(origin) yield self.check_server_matches_acl(origin_host, pdu.room_id) ret_pdu = yield self.handler.on_invite_request(origin, pdu) time_now = self._clock.time_msec() - defer.returnValue((200, {"event": ret_pdu.get_pdu_json(time_now)})) + defer.returnValue({"event": ret_pdu.get_pdu_json(time_now)}) @defer.inlineCallbacks - def on_send_join_request(self, origin, content): + def on_send_join_request(self, origin, content, room_id): logger.debug("on_send_join_request: content: %s", content) - pdu = event_from_pdu_json(content) + + room_version = yield self.store.get_room_version(room_id) + format_ver = room_version_to_event_format(room_version) + pdu = event_from_pdu_json(content, format_ver) origin_host, _ = parse_server_name(origin) yield self.check_server_matches_acl(origin_host, pdu.room_id) @@ -383,13 +430,22 @@ class FederationServer(FederationBase): origin_host, _ = parse_server_name(origin) yield self.check_server_matches_acl(origin_host, room_id) pdu = yield self.handler.on_make_leave_request(room_id, user_id) + + room_version = yield self.store.get_room_version(room_id) + time_now = self._clock.time_msec() - defer.returnValue({"event": pdu.get_pdu_json(time_now)}) + defer.returnValue({ + "event": pdu.get_pdu_json(time_now), + "room_version": room_version, + }) @defer.inlineCallbacks - def on_send_leave_request(self, origin, content): + def on_send_leave_request(self, origin, content, room_id): logger.debug("on_send_leave_request: content: %s", content) - pdu = event_from_pdu_json(content) + + room_version = yield self.store.get_room_version(room_id) + format_ver = room_version_to_event_format(room_version) + pdu = event_from_pdu_json(content, format_ver) origin_host, _ = parse_server_name(origin) yield self.check_server_matches_acl(origin_host, pdu.room_id) @@ -435,13 +491,16 @@ class FederationServer(FederationBase): origin_host, _ = parse_server_name(origin) yield self.check_server_matches_acl(origin_host, room_id) + room_version = yield self.store.get_room_version(room_id) + format_ver = room_version_to_event_format(room_version) + auth_chain = [ - event_from_pdu_json(e) + event_from_pdu_json(e, format_ver) for e in content["auth_chain"] ] signed_auth = yield self._check_sigs_and_hash_and_fetch( - origin, auth_chain, outlier=True + origin, auth_chain, outlier=True, room_version=room_version, ) ret = yield self.handler.on_query_auth( @@ -586,16 +645,19 @@ class FederationServer(FederationBase): """ # check that it's actually being sent from a valid destination to # workaround bug #1753 in 0.18.5 and 0.18.6 - if origin != get_domain_from_id(pdu.event_id): + if origin != get_domain_from_id(pdu.sender): # We continue to accept join events from any server; this is # necessary for the federation join dance to work correctly. # (When we join over federation, the "helper" server is # responsible for sending out the join event, rather than the - # origin. See bug #1893). + # origin. See bug #1893. This is also true for some third party + # invites). if not ( pdu.type == 'm.room.member' and pdu.content and - pdu.content.get("membership", None) == 'join' + pdu.content.get("membership", None) in ( + Membership.JOIN, Membership.INVITE, + ) ): logger.info( "Discarding PDU %s from invalid origin %s", @@ -608,9 +670,12 @@ class FederationServer(FederationBase): pdu.event_id, origin ) + # We've already checked that we know the room version by this point + room_version = yield self.store.get_room_version(pdu.room_id) + # Check signature. try: - pdu = yield self._check_sigs_and_hash(pdu) + pdu = yield self._check_sigs_and_hash(room_version, pdu) except SynapseError as e: raise FederationError( "ERROR", |