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Merge pull request #5805 from matrix-org/erikj/validate_state

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Validate well known state events are state events.
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Erik Johnston 2019-08-01 13:45:48 +01:00 committed by GitHub
commit 55a0c98d16
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2 changed files with 10 additions and 2 deletions
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1
changelog.d/5805.misc Normal file
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@ -0,0 +1 @@
Deny sending well known state types as non-state events.

11
synapse/events/validator.py
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@ -95,10 +95,10 @@ class EventValidator(object):
elif event.type == EventTypes.Topic:
self._ensure_strings(event.content, ["topic"])
self._ensure_state_event(event)
elif event.type == EventTypes.Name:
self._ensure_strings(event.content, ["name"])
self._ensure_state_event(event)
elif event.type == EventTypes.Member:
if "membership" not in event.content:
raise SynapseError(400, "Content has not membership key")
@ -106,6 +106,7 @@ class EventValidator(object):
if event.content["membership"] not in Membership.LIST:
raise SynapseError(400, "Invalid membership key")
self._ensure_state_event(event)
elif event.type == EventTypes.Tombstone:
if "replacement_room" not in event.content:
raise SynapseError(400, "Content has no replacement_room key")
@ -115,9 +116,15 @@ class EventValidator(object):
400, "Tombstone cannot reference the room it was sent in"
)
self._ensure_state_event(event)
def _ensure_strings(self, d, keys):
for s in keys:
if s not in d:
raise SynapseError(400, "'%s' not in content" % (s,))
if not isinstance(d[s], string_types):
raise SynapseError(400, "'%s' not a string type" % (s,))
def _ensure_state_event(self, event):
if not event.is_state():
raise SynapseError(400, "'%s' must be state events" % (event.type,))