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Reject events which have too many auth_events or prev_events
... this should protect us from being dossed by people making silly events (deliberately or otherwise)
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@ -15,8 +15,14 @@
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# limitations under the License.
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"""Contains handlers for federation events."""
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import httplib
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import itertools
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import logging
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from signedjson.key import decode_verify_key_bytes
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from signedjson.sign import verify_signed_json
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from twisted.internet import defer
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from unpaddedbase64 import decode_base64
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from ._base import BaseHandler
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@ -43,10 +49,6 @@ from synapse.util.retryutils import NotRetryingDestination
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from synapse.util.distributor import user_joined_room
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from twisted.internet import defer
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import itertools
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import logging
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logger = logging.getLogger(__name__)
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@ -115,6 +117,28 @@ class FederationHandler(BaseHandler):
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logger.debug("Already seen pdu %s", pdu.event_id)
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return
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# do some initial sanity-checking of the event. In particular, make
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# sure it doesn't have hundreds of prev_events or auth_events, which
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# could cause a huge state resolution or cascade of event fetches
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if len(pdu.prev_events) > 20:
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logger.warn("Rejecting event %s which has %i prev_events",
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pdu.event_id, len(pdu.prev_events))
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raise FederationError(
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"ERROR",
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httplib.BAD_REQUEST,
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"Too many prev_events",
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affected=pdu.event_id,
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)
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if len(pdu.auth_events) > 10:
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logger.warn("Rejecting event %s which has %i auth_events",
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pdu.event_id, len(pdu.auth_events))
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raise FederationError(
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"ERROR",
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httplib.BAD_REQUEST,
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"Too many auth_events",
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affected=pdu.event_id,
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)
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# If we are currently in the process of joining this room, then we
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# queue up events for later processing.
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if pdu.room_id in self.room_queues:
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