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Improve validation of field size limits in events. (#14664)

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reivilibre 2022-12-13 13:19:19 +00:00 • committed by GitHub
parent e2a1adbf5d
commit 62ed877433
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8 changed files with 123 additions and 34 deletions
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20
synapse/handlers/federation_event.py
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@ -43,6 +43,7 @@ from synapse.api.constants import (
from synapse.api.errors import (
AuthError,
Codes,
EventSizeError,
FederationError,
FederationPullAttemptBackoffError,
HttpResponseException,
@ -1736,6 +1737,15 @@ class FederationEventHandler:
except AuthError as e:
logger.warning("Rejecting %r because %s", event, e)
context.rejected = RejectedReason.AUTH_ERROR
except EventSizeError as e:
if e.unpersistable:
# This event is completely unpersistable.
raise e
# Otherwise, we are somewhat lenient and just persist the event
# as rejected, for moderate compatibility with older Synapse
# versions.
logger.warning("While validating received event %r: %s", event, e)
context.rejected = RejectedReason.OVERSIZED_EVENT
events_and_contexts_to_persist.append((event, context))
@ -1781,6 +1791,16 @@ class FederationEventHandler:
# TODO: use a different rejected reason here?
context.rejected = RejectedReason.AUTH_ERROR
return
except EventSizeError as e:
if e.unpersistable:
# This event is completely unpersistable.
raise e
# Otherwise, we are somewhat lenient and just persist the event
# as rejected, for moderate compatibility with older Synapse
# versions.
logger.warning("While validating received event %r: %s", event, e)
context.rejected = RejectedReason.OVERSIZED_EVENT
return
# next, check that we have all of the event's auth events.
#