synapse/changelog.d/15695.bugfix
Grant McLean 5c24d7b9eb
Check required power levels earlier in createRoom handler. (#15695)
* Check required power levels earlier in createRoom handler.

- If a server was configured to reject the creation of rooms with E2EE
  enabled (by specifying an unattainably high power level for
  "m.room.encryption" in default_power_level_content_override), the 403
  error was not being triggered until after the room was created and
  before the "m.room.power_levels" was sent.  This allowed a user to
  access the partially-configured room and complete the setup of E2EE
  and power levels manually.

- This change causes the power level overrides to be checked earlier and
  the request to be rejected before the user gains access to the room.

- A new `_validate_room_config` method is added to contain checks that
  should be run before a room is created.

- The new test case confirms that a user request is rejected by the new
  validation method.

Signed-off-by: Grant McLean <grant@catalyst.net.nz>

* Add a changelog file.

* Formatting fix for black.

* Remove unneeded line from test.

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Signed-off-by: Grant McLean <grant@catalyst.net.nz>
2023-06-07 16:21:25 +01:00

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Check permissions for enabling encryption earlier during room creation to avoid creating broken rooms.