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Fix event size checks #13710

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Oct 21, 2022
Merged

Fix event size checks #13710

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b8a0039
Fix event size checks
deepbluev7 Aug 30, 2022
4b7f5bd
Add changelog
deepbluev7 Sep 4, 2022
47942d7
Update changelog.d/13710.bugfix
reivilibre Sep 9, 2022
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1 change: 1 addition & 0 deletions changelog.d/13710.bugfix
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix a long-standing bug where Synapse would count codepoints instead of bytes when validating the size of some fields.
10 changes: 5 additions & 5 deletions synapse/event_auth.py
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Expand Up @@ -325,15 +325,15 @@ def check_state_dependent_auth_rules(


def _check_size_limits(event: "EventBase") -> None:
if len(event.user_id) > 255:
if len(event.user_id.encode("utf-8")) > 255:
raise EventSizeError("'user_id' too large")
if len(event.room_id) > 255:
if len(event.room_id.encode("utf-8")) > 255:
raise EventSizeError("'room_id' too large")
if event.is_state() and len(event.state_key) > 255:
if event.is_state() and len(event.state_key.encode("utf-8")) > 255:
raise EventSizeError("'state_key' too large")
if len(event.type) > 255:
if len(event.type.encode("utf-8")) > 255:
raise EventSizeError("'type' too large")
if len(event.event_id) > 255:
if len(event.event_id.encode("utf-8")) > 255:
raise EventSizeError("'event_id' too large")
if len(encode_canonical_json(event.get_pdu_json())) > MAX_PDU_SIZE:
raise EventSizeError("event too large")
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