You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
175 lines
8.5 KiB
Markdown
175 lines
8.5 KiB
Markdown
---
|
|
toc_hide: true
|
|
---
|
|
|
|
Events must be signed by the server denoted by the `sender` property.
|
|
|
|
`m.room.redaction` events are not explicitly part of the auth rules.
|
|
They are still subject to the minimum power level rules, but should always
|
|
fall into "10. Otherwise, allow". Instead of being authorized at the time
|
|
of receipt, they are authorized at a later stage: see the
|
|
[Redactions](#redactions) section below for more information.
|
|
|
|
The types of state events that affect authorization are:
|
|
|
|
- [`m.room.create`](/client-server-api#mroomcreate)
|
|
- [`m.room.member`](/client-server-api#mroommember)
|
|
- [`m.room.join_rules`](/client-server-api#mroom)
|
|
- [`m.room.power_levels`](/client-server-api#mroompower_levels)
|
|
- [`m.room.third_party_invite`](/client-server-api#mroomthird_party_invite)
|
|
|
|
{{% boxes/note %}}
|
|
Power levels are inferred from defaults when not explicitly supplied.
|
|
For example, mentions of the `sender`'s power level can also refer to
|
|
the default power level for users in the room.
|
|
{{% /boxes/note %}}
|
|
|
|
The rules are as follows:
|
|
|
|
1. If type is `m.room.create`:
|
|
1. If it has any `prev_events`, reject.
|
|
2. If the domain of the `room_id` does not match the domain of the
|
|
`sender`, reject.
|
|
3. If `content.room_version` is present and is not a recognised
|
|
version, reject.
|
|
4. If `content` has no `creator` property, reject.
|
|
5. Otherwise, allow.
|
|
2. Considering the event's `auth_events`:
|
|
1. If there are duplicate entries for a given `type` and `state_key` pair,
|
|
reject.
|
|
2. If there are entries whose `type` and `state_key` don't match those
|
|
specified by the [auth events
|
|
selection](/server-server-api#auth-events-selection)
|
|
algorithm described in the server specification, reject.
|
|
3. If there are entries which were themselves rejected under the [checks
|
|
performed on receipt of a
|
|
PDU](server-server-api/#checks-performed-on-receipt-of-a-pdu), reject.
|
|
4. If there is no `m.room.create` event among the entries, reject.
|
|
3. If the `content` of the `m.room.create` event in the room state has the
|
|
property `m.federate` set to `false`, and the `sender` domain of the event
|
|
does not match the `sender` domain of the create event, reject.
|
|
4. If type is `m.room.member`:
|
|
1. If there is no `state_key` property, or no `membership` property in
|
|
`content`, reject.
|
|
2. {{< added-in this=true >}}
|
|
If `content` has a `join_authorised_via_users_server` property:
|
|
1. If the event is not validly signed by the homeserver of the user ID denoted
|
|
by the key, reject.
|
|
3. If `membership` is `join`:
|
|
1. If the only previous event is an `m.room.create` and the
|
|
`state_key` is the creator, allow.
|
|
2. If the `sender` does not match `state_key`, reject.
|
|
3. If the `sender` is banned, reject.
|
|
4. If the `join_rule` is `invite` or `knock` then allow if
|
|
membership state is `invite` or `join`.
|
|
5. {{< added-in this=true >}}
|
|
If the `join_rule` is `restricted`:
|
|
1. If membership state is `join` or `invite`, allow.
|
|
2. If the `join_authorised_via_users_server` key in `content`
|
|
is not a user with sufficient permission to invite other
|
|
users, reject.
|
|
3. Otherwise, allow.
|
|
6. If the `join_rule` is `public`, allow.
|
|
7. Otherwise, reject.
|
|
4. If `membership` is `invite`:
|
|
1. If `content` has a `third_party_invite` property:
|
|
1. If *target user* is banned, reject.
|
|
2. If `content.third_party_invite` does not have a `signed`
|
|
property, reject.
|
|
3. If `signed` does not have `mxid` and `token` properties,
|
|
reject.
|
|
4. If `mxid` does not match `state_key`, reject.
|
|
5. If there is no `m.room.third_party_invite` event in the
|
|
current room state with `state_key` matching `token`,
|
|
reject.
|
|
6. If `sender` does not match `sender` of the
|
|
`m.room.third_party_invite`, reject.
|
|
7. If any signature in `signed` matches any public key in
|
|
the `m.room.third_party_invite` event, allow. The public
|
|
keys are in `content` of `m.room.third_party_invite` as:
|
|
1. A single public key in the `public_key` property.
|
|
2. A list of public keys in the `public_keys` property.
|
|
8. Otherwise, reject.
|
|
2. If the `sender`'s current membership state is not `join`,
|
|
reject.
|
|
3. If *target user*'s current membership state is `join` or
|
|
`ban`, reject.
|
|
4. If the `sender`'s power level is greater than or equal to
|
|
the *invite level*, allow.
|
|
5. Otherwise, reject.
|
|
5. If `membership` is `leave`:
|
|
1. If the `sender` matches `state_key`, allow if and only if
|
|
that user's current membership state is `invite`, `join`,
|
|
or `knock`.
|
|
2. If the `sender`'s current membership state is not `join`,
|
|
reject.
|
|
3. If the *target user*'s current membership state is `ban`,
|
|
and the `sender`'s power level is less than the *ban level*,
|
|
reject.
|
|
4. 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.
|
|
5. Otherwise, reject.
|
|
6. If `membership` is `ban`:
|
|
1. If the `sender`'s current membership state is not `join`,
|
|
reject.
|
|
2. 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.
|
|
3. Otherwise, reject.
|
|
7. If `membership` is `knock`:
|
|
1. If the `join_rule` is anything other than `knock`, reject.
|
|
2. If `sender` does not match `state_key`, reject.
|
|
3. If the `sender`'s current membership is not `ban` or `join`, allow.
|
|
4. Otherwise, reject.
|
|
8. Otherwise, the membership is unknown. Reject.
|
|
5. If the `sender`'s current membership state is not `join`, reject.
|
|
6. If type is `m.room.third_party_invite`:
|
|
1. Allow if and only if `sender`'s current power level is greater
|
|
than or equal to the *invite level*.
|
|
7. If the event type's *required power level* is greater than the
|
|
`sender`'s power level, reject.
|
|
8. If the event has a `state_key` that starts with an `@` and does not
|
|
match the `sender`, reject.
|
|
9. If type is `m.room.power_levels`:
|
|
1. If the `users` property in `content` is not an object with keys that
|
|
are valid user IDs with values that are integers (or a string
|
|
that is an integer), reject.
|
|
2. If there is no previous `m.room.power_levels` event in the room,
|
|
allow.
|
|
3. For the properties `users_default`, `events_default`, `state_default`,
|
|
`ban`, `redact`, `kick`, `invite` check if they were added,
|
|
changed or removed. For each found alteration:
|
|
1. If the current value is higher than the `sender`'s current
|
|
power level, reject.
|
|
2. If the new value is higher than the `sender`'s current power
|
|
level, reject.
|
|
4. For each entry being changed in, or removed from, the `events` or
|
|
`notifications` properties:
|
|
1. If the current value is greater than the `sender`'s current
|
|
power level, reject.
|
|
5. For each entry being added to, or changed in the `events` or
|
|
`notifications` properties:
|
|
1. If the new value is greater than the `sender`'s current power
|
|
level, reject.
|
|
6. For each entry being changed in, or removed from, the `users` property,
|
|
other than the `sender`'s own entry:
|
|
1. If the current value is greater than or equal to the `sender`'s
|
|
current power level, reject.
|
|
7. For each entry being added to, or changed in, the `users` property:
|
|
1. If the new value is greater than the `sender`'s current power
|
|
level, reject.
|
|
8. Otherwise, allow.
|
|
10. Otherwise, allow.
|
|
|
|
{{% boxes/note %}}
|
|
Some consequences of these rules:
|
|
|
|
- Unless you are a member of the room, the only permitted operations
|
|
(apart from the initial create/join) are: joining a public room;
|
|
accepting or rejecting an invitation to a room.
|
|
- To unban somebody, you must have power level greater than or equal
|
|
to both the kick *and* ban levels, *and* greater than the target
|
|
user's power level.
|
|
{{% /boxes/note %}}
|