Merge pull request #1591 from matrix-org/erikj/fixup_auth_rules

Fix up auth rules
pull/977/head
Erik Johnston 6 years ago committed by GitHub
commit 0adfd1ebb0
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@ -372,103 +372,129 @@ the state of the room.
The rules are as follows:
1. If type is ``m.room.create``, allow if and only if it has no
previous events - *i.e.* it is the first event in the room.
1. If type is ``m.room.create``:
2. If type is ``m.room.member``:
a. If it has any previous events, reject.
b. If the domain of the ``room_id`` does not match the domain of the
``sender``, reject.
c. If ``content.room_version`` is present and is not a recognised version,
reject.
d. If ``content`` has no ``creator`` field, reject.
e. Otherwise, allow.
a. If ``membership`` is ``join``:
#. If event does not have a ``m.room.create`` in its ``auth_events``, reject.
i. If the only previous event is an ``m.room.create``
and the ``state_key`` is the creator, allow.
#. If type is ``m.room.aliases``:
#. If the ``sender`` does not match ``state_key``, reject.
a. If event has no ``state_key``, reject.
b. If sender's domain doesn't matches ``state_key``, reject.
c. Otherwise, allow.
#. If the user's current membership state is ``invite`` or ``join``,
allow.
#. If type is ``m.room.member``:
#. If the ``join_rule`` is ``public``, allow.
a. If no ``state_key`` key or ``membership`` key in ``content``, reject.
#. Otherwise, reject.
#. If ``membership`` is ``join``:
b. If ``membership`` is ``invite``:
i. If the only previous event is an ``m.room.create``
and the ``state_key`` is the creator, allow.
i. If the ``sender``'s current membership state is not ``join``, reject.
#. If the ``sender`` does not match ``state_key``, reject.
#. If *target user*'s current membership state is ``join`` or ``ban``,
reject.
#. If the ``sender`` is banned, reject.
#. If the ``sender``'s power level is greater than or equal to the *invite
level*, allow.
#. If the ``join_rule`` is ``invite`` then allow if membership state
is ``invite`` or ``join``.
#. Otherwise, reject.
#. If the ``join_rule`` is ``public``, allow.
c. If ``membership`` is ``leave``:
#. Otherwise, reject.
i. If the ``sender`` matches ``state_key``, allow if and only if that user's
current membership state is ``invite`` or ``join``.
#. If ``membership`` is ``invite``:
#. If the ``sender``'s current membership state is not ``join``, reject.
i. If the ``sender``'s current membership state is not ``join``, reject.
#. If the *target user*'s current membership state is ``ban``, and the
``sender``'s power level is less than the *ban level*, reject.
#. If *target user*'s current membership state is ``join`` or ``ban``,
reject.
#. If the ``sender``'s power level is greater than or equal to the *kick
level*, and the *target user*'s power level is less than the
``sender``'s power level, allow.
#. If the ``sender``'s power level is greater than or equal to the *invite
level*, allow.
#. Otherwise, reject.
#. Otherwise, reject.
d. If ``membership`` is ``ban``:
#. If ``membership`` is ``leave``:
i. If the ``sender``'s current membership state is not ``join``, reject.
i. If the ``sender`` matches ``state_key``, allow if and only if that user's
current membership state is ``invite`` or ``join``.
#. If the ``sender``'s power level is greater than or equal to the *ban
level*, and the *target user*'s power level is less than the
``sender``'s power level, allow.
#. If the ``sender``'s current membership state is not ``join``, reject.
#. Otherwise, reject.
#. If the *target user*'s current membership state is ``ban``, and the
``sender``'s power level is less than the *ban level*, reject.
e. Otherwise, the membership is unknown. Reject.
#. If the ``sender``'s power level is greater than or equal to the *kick
level*, and the *target user*'s power level is less than the
``sender``'s power level, allow.
3. If the ``sender``'s current membership state is not ``join``, reject.
#. Otherwise, reject.
4. If the event type's *required power level* is greater than the ``sender``'s power
#. If ``membership`` is ``ban``:
i. If the ``sender``'s current membership state is not ``join``, reject.
#. If the ``sender``'s power level is greater than or equal to the *ban
level*, and the *target user*'s power level is less than the
``sender``'s power level, allow.
#. Otherwise, reject.
#. Otherwise, the membership is unknown. Reject.
#. If the ``sender``'s current membership state is not ``join``, reject.
#. If the event type's *required power level* is greater than the ``sender``'s power
level, reject.
5. If type is ``m.room.power_levels``:
#. If the event has a ``state_key`` that starts with an ``@`` and does not match
the ``sender``, reject.
#. If type is ``m.room.power_levels``:
a. If ``users`` key in ``content`` is not a dictionary with keys that are
valid user IDs with values that are integers (or a string that is an
integer), reject.
a. If there is no previous ``m.room.power_levels`` event in the room, allow.
#. If there is no previous ``m.room.power_levels`` event in the room, allow.
b. For each of the keys ``users_default``, ``events_default``,
``state_default``, ``ban``, ``redact``, ``kick``, ``invite``, as well as
each entry being changed under the ``events`` or ``users`` keys:
#. For each of the keys ``users_default``, ``events_default``,
``state_default``, ``ban``, ``redact``, ``kick``, ``invite``, as well as
each entry being changed under the ``events`` or ``users`` keys:
i. If the current value is higher than the ``sender``'s current power level,
reject.
i. If the current value is higher than the ``sender``'s current power level,
reject.
#. If the new value is higher than the ``sender``'s current power level,
reject.
#. If the new value is higher than the ``sender``'s current power level,
reject.
c. For each entry being changed under the ``users`` key, other than the
``sender``'s own entry:
#. For each entry being changed under the ``users`` key, other than the
``sender``'s own entry:
i. If the current value is equal to the ``sender``'s current power level,
reject.
i. If the current value is equal to the ``sender``'s current power level,
reject.
d. Otherwise, allow.
#. Otherwise, allow.
6. If type is ``m.room.redaction``:
#. If type is ``m.room.redaction``:
a. If the ``sender``'s power level is greater than or equal to the *redact
level*, allow.
a. If the ``sender``'s power level is greater than or equal to the *redact
level*, allow.
#. If the ``sender`` of the event being redacted is the same as the
``sender`` of the ``m.room.redaction``, allow.
#. If the domain of the ``event_id`` of the event being redacted is the same
as the domain of the ``event_id`` of the ``m.room.redaction``, allow.
#. Otherwise, reject.
#. Otherwise, reject.
7. Otherwise, allow.
#. Otherwise, allow.
.. NOTE::

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