Room versions 8 and 9: Restricted rooms (#3387)
* Room versions 8 and 9: Restricted rooms MSCs: * https://github.com/matrix-org/matrix-doc/pull/3083 * https://github.com/matrix-org/matrix-doc/pull/3289 * https://github.com/matrix-org/matrix-doc/pull/3375 * Changelogs * Capitalization Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com> * Remove verbiage for spaces because they don't exist * Iterations on text * Another clarification * Make error code descriptions consistent * Apply suggestions from code review Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com> * Incorporate from merge * Misc language update per review * Update accuracy before splitting auth rules * fix wtf moment * Fix up v8 and v9 to match "fully specify room versions" * Scope auth events selection to room version * Apply consistency * Add changelogs * Review part 1 * Apply suggestions from code review Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com> * Split out redaction sections * Clarify general case of join conditions Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com> Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>pull/977/head
Travis Ralston
3 years ago
committed by
GitHub
parent
3475ef62ab
commit
6c4aabd053
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Add support for `restricted` rooms as per [MSC3083](https://github.com/matrix-org/matrix-doc/pull/3083), [MSC3289](https://github.com/matrix-org/matrix-doc/pull/3289), and [MSC3375](https://github.com/matrix-org/matrix-doc/pull/3375).
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Add Room Version 8 as per [MSC3289](https://github.com/matrix-org/matrix-doc/pull/3289).
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Add Room Version 9 as per [MSC3375](https://github.com/matrix-org/matrix-doc/pull/3375).
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Add support for `restricted` rooms as per [MSC3083](https://github.com/matrix-org/matrix-doc/pull/3083), [MSC3289](https://github.com/matrix-org/matrix-doc/pull/3289), and [MSC3375](https://github.com/matrix-org/matrix-doc/pull/3375).
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---
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toc_hide: true
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---
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Events must be signed by the server denoted by the `sender` key.
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`m.room.redaction` events are not explicitly part of the auth rules.
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They are still subject to the minimum power level rules, but should always
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fall into "10. Otherwise, allow". Instead of being authorized at the time
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of receipt, they are authorized at a later stage: see the
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[Redactions](#redactions) section below for more information.
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The types of state events that affect authorization are:
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- `m.room.create`
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- `m.room.member`
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- `m.room.join_rules`
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- `m.room.power_levels`
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- `m.room.third_party_invite`
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{{% boxes/note %}}
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Power levels are inferred from defaults when not explicitly supplied.
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For example, mentions of the `sender`'s power level can also refer to
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the default power level for users in the room.
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{{% /boxes/note %}}
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The rules are as follows:
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1. If type is `m.room.create`:
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1. If it has any previous events, reject.
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2. If the domain of the `room_id` does not match the domain of the
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`sender`, reject.
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3. If `content.room_version` is present and is not a recognised
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version, reject.
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4. If `content` has no `creator` field, reject.
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5. Otherwise, allow.
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2. Reject if event has `auth_events` that:
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1. have duplicate entries for a given `type` and `state_key` pair
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2. have entries whose `type` and `state_key` don't match those
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specified by the [auth events
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selection](/server-server-api#auth-events-selection)
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algorithm described in the server specification.
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3. If event does not have a `m.room.create` in its `auth_events`,
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reject.
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4. If type is `m.room.member`:
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1. If no `state_key` key or `membership` key in `content`, reject.
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2. If `content` has a `join_authorised_via_users_server`
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key:
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1. If the event is not validly signed by the user ID denoted
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by the key, reject.
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3. If `membership` is `join`:
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1. If the only previous event is an `m.room.create` and the
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`state_key` is the creator, allow.
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2. If the `sender` does not match `state_key`, reject.
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3. If the `sender` is banned, reject.
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4. If the `join_rule` is `invite` then allow if membership
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state is `invite` or `join`.
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5. If the `join_rule` is `restricted`:
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1. If membership state is `join` or `invite`, allow.
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2. If the `join_authorised_via_users_server` key in `content`
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is not a user with sufficient permission to invite other
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users, reject.
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3. Otherwise, allow.
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6. If the `join_rule` is `public`, allow.
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7. Otherwise, reject.
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4. If `membership` is `invite`:
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1. If `content` has `third_party_invite` key:
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1. If *target user* is banned, reject.
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2. If `content.third_party_invite` does not have a `signed`
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key, reject.
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3. If `signed` does not have `mxid` and `token` keys,
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reject.
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4. If `mxid` does not match `state_key`, reject.
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5. If there is no `m.room.third_party_invite` event in the
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current room state with `state_key` matching `token`,
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reject.
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6. If `sender` does not match `sender` of the
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`m.room.third_party_invite`, reject.
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7. If any signature in `signed` matches any public key in
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the `m.room.third_party_invite` event, allow. The public
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keys are in `content` of `m.room.third_party_invite` as:
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1. A single public key in the `public_key` field.
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2. A list of public keys in the `public_keys` field.
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8. Otherwise, reject.
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2. If the `sender`'s current membership state is not `join`,
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reject.
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3. If *target user*'s current membership state is `join` or
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`ban`, reject.
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4. If the `sender`'s power level is greater than or equal to
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the *invite level*, allow.
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5. Otherwise, reject.
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5. If `membership` is `leave`:
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1. If the `sender` matches `state_key`, allow if and only if
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that user's current membership state is `invite` or `join`.
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2. If the `sender`'s current membership state is not `join`,
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reject.
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3. If the *target user*'s current membership state is `ban`,
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and the `sender`'s power level is less than the *ban level*,
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reject.
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4. If the `sender`'s power level is greater than or equal to
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the *kick level*, and the *target user*'s power level is
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less than the `sender`'s power level, allow.
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5. Otherwise, reject.
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6. If `membership` is `ban`:
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1. If the `sender`'s current membership state is not `join`,
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reject.
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2. If the `sender`'s power level is greater than or equal to
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the *ban level*, and the *target user*'s power level is less
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than the `sender`'s power level, allow.
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3. Otherwise, reject.
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7. If `membership` is `knock`:
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1. If the `join_rule` is anything other than `knock`, reject.
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2. If `sender` does not match `state_key`, reject.
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3. If the `sender`'s current membership is not `ban`, `invite`,
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or `join`, allow.
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8. Otherwise, the membership is unknown. Reject.
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5. If the `sender`'s current membership state is not `join`, reject.
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6. If type is `m.room.third_party_invite`:
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1. Allow if and only if `sender`'s current power level is greater
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than or equal to the *invite level*.
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7. If the event type's *required power level* is greater than the
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`sender`'s power level, reject.
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8. If the event has a `state_key` that starts with an `@` and does not
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match the `sender`, reject.
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9. If type is `m.room.power_levels`:
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1. If `users` key in `content` is not a dictionary with keys that
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are valid user IDs with values that are integers (or a string
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that is an integer), reject.
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2. If there is no previous `m.room.power_levels` event in the room,
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allow.
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3. For the keys `users_default`, `events_default`, `state_default`,
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`ban`, `redact`, `kick`, `invite` check if they were added,
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changed or removed. For each found alteration:
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1. If the current value is higher than the `sender`'s current
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power level, reject.
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2. If the new value is higher than the `sender`'s current power
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level, reject.
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4. For each entry being added, changed or removed in both the
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`events`, `users`, and `notifications` keys:
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1. If the current value is higher than the `sender`'s current
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power level, reject.
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2. If the new value is higher than the `sender`'s current power
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level, reject.
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5. For each entry being changed under the `users` key, other than
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the `sender`'s own entry:
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1. If the current value is equal to the `sender`'s current
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power level, reject.
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6. Otherwise, allow.
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10. Otherwise, allow.
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{{% boxes/note %}}
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Some consequences of these rules:
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- Unless you are a member of the room, the only permitted operations
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(apart from the initial create/join) are: joining a public room;
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accepting or rejecting an invitation to a room.
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- To unban somebody, you must have power level greater than or equal
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to both the kick *and* ban levels, *and* greater than the target
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user's power level.
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{{% /boxes/note %}}
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@ -0,0 +1,123 @@
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---
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title: Room Version 8
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type: docs
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weight: 60
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---
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This room version builds on [version 7](/rooms/v7) to introduce a new
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join rule that allows members to join the room based on membership in
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another room.
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{{% boxes/warning %}}
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This room version is known to have issues relating to redactions of member
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join events. [Room version 9](/rooms/v9) should be preferred over v8 when
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creating rooms.
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{{% /boxes/warning %}}
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## Client considerations
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Clients are encouraged to expose the option for the join rule in their
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user interface for supported room versions.
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The new join rule, `restricted`, is described in the
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[Client-Server API](/client-server-api/#restricted-rooms).
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Clients which implement the redaction algorithm locally should refer to the
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[redactions](#redactions) section below for a full overview.
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### Redactions
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{{% added-in this=true %}} `m.room.join_rules` events now keep `allow` in addition to other
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keys in `content` when being redacted.
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{{% boxes/warning %}}
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[Room version 9](/rooms/v9) adds additional cases of protected properties for behaviour
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related to restricted rooms (the functionality introduced in v8). v9 is preferred over
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v8 when creating new rooms.
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{{% /boxes/warning %}}
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The full redaction algorithm follows.
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Upon receipt of a redaction event, the server must strip off any keys
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not in the following list:
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- `event_id`
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- `type`
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- `room_id`
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- `sender`
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- `state_key`
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- `content`
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- `hashes`
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- `signatures`
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- `depth`
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- `prev_events`
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- `prev_state`
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- `auth_events`
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- `origin`
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- `origin_server_ts`
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- `membership`
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The content object must also be stripped of all keys, unless it is one
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of one of the following event types:
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- `m.room.member` allows key `membership`.
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- `m.room.create` allows key `creator`.
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- `m.room.join_rules` allows keys `join_rule`, `allow`.
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- `m.room.power_levels` allows keys `ban`, `events`, `events_default`,
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`kick`, `redact`, `state_default`, `users`, `users_default`.
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- `m.room.history_visibility` allows key `history_visibility`.
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## Server implementation components
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{{% boxes/warning %}}
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The information contained in this section is strictly for server
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implementors. Applications which use the Client-Server API are generally
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unaffected by the intricacies contained here. The section above
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regarding client considerations is the resource that Client-Server API
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use cases should reference.
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{{% /boxes/warning %}}
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Room version 8 adds a new join rule to allow members of a room to join another
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room without invite. Otherwise, the room version inherits all properties of
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[Room version 7](/rooms/v7).
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### Authorization rules
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{{% added-in this=true %}} For checks performed upon `m.room.member` events, new
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points for handling `content.join_authorised_via_users_server` are added (Rule 4.2
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and 4.3.5).
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{{% rver-fragment name="v8-auth-rules" %}}
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### Redactions
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[See above](#redactions).
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## Unchanged from v7
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The following sections have not been modified since v7, but are included for
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completeness.
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### State resolution
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{{% rver-fragment name="v2-state-res" %}}
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### Event IDs
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{{% rver-fragment name="v4-event-ids" %}}
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### Event format
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{{% rver-fragment name="v4-event-format" %}}
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### Handling redactions
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{{% rver-fragment name="v3-handling-redactions" %}}
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### Canonical JSON
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{{% rver-fragment name="v6-canonical-json" %}}
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### Signing key validity period
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{{% rver-fragment name="v5-signing-requirements" %}}
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@ -0,0 +1,119 @@
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---
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title: Room Version 9
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type: docs
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weight: 60
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---
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This room version builds on [version 8](/rooms/v8) to add additional redaction
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rules that were unintentionally missed when incorporating v8.
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## Client considerations
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See [room version 8](/rooms/v8) for specific details regarding the addition of
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restricted rooms.
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Clients which implement the redaction algorithm locally should refer to the
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[redactions](#redactions) section below for a full overview.
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### Redactions
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{{% added-in this=true %}} `m.room.member` now keep `join_authorised_via_users_server`
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in addition to other keys in `content` when being redacted.
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{{% boxes/rationale %}}
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Without the `join_authorised_via_users_server` property, redacted join events
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can become invalid when verifying the auth chain of a given event, thus creating
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a split-brain scenario where the user is able to speak from one server's
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perspective but most others will continually reject their events.
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This can theoretically be worked around with a rejoin to the room, being careful
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not to use the faulty events as `prev_events`, though instead it is encouraged
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to use v9 rooms over v8 rooms to outright avoid the situation.
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[Issue #3373](https://github.com/matrix-org/matrix-doc/issues/3373) has further
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information.
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{{% /boxes/rationale %}}
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The full redaction algorithm follows.
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{{% rver-fragment name="v3-handling-redactions" %}}
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Upon receipt of a redaction event, the server must strip off any keys
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not in the following list:
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- `event_id`
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- `type`
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- `room_id`
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- `sender`
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- `state_key`
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- `content`
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- `hashes`
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- `signatures`
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- `depth`
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- `prev_events`
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- `prev_state`
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||||||
|
- `auth_events`
|
||||||
|
- `origin`
|
||||||
|
- `origin_server_ts`
|
||||||
|
- `membership`
|
||||||
|
|
||||||
|
The content object must also be stripped of all keys, unless it is one
|
||||||
|
of one of the following event types:
|
||||||
|
|
||||||
|
- `m.room.member` allows keys `membership`, `join_authorised_via_users_server`.
|
||||||
|
- `m.room.create` allows key `creator`.
|
||||||
|
- `m.room.join_rules` allows keys `join_rule`, `allow`.
|
||||||
|
- `m.room.power_levels` allows keys `ban`, `events`, `events_default`,
|
||||||
|
`kick`, `redact`, `state_default`, `users`, `users_default`.
|
||||||
|
- `m.room.history_visibility` allows key `history_visibility`.
|
||||||
|
|
||||||
|
## Server implementation components
|
||||||
|
|
||||||
|
{{% boxes/warning %}}
|
||||||
|
The information contained in this section is strictly for server
|
||||||
|
implementors. Applications which use the Client-Server API are generally
|
||||||
|
unaffected by the intricacies contained here. The section above
|
||||||
|
regarding client considerations is the resource that Client-Server API
|
||||||
|
use cases should reference.
|
||||||
|
{{% /boxes/warning %}}
|
||||||
|
|
||||||
|
Room version 8 added a new `restricted` join rule to allow members of a room
|
||||||
|
to join another room without invite. Room version 9 is based upon v8 with the
|
||||||
|
following considerations.
|
||||||
|
|
||||||
|
### Redactions
|
||||||
|
|
||||||
|
[See above](#redactions).
|
||||||
|
|
||||||
|
## Unchanged from v8
|
||||||
|
|
||||||
|
The following sections have not been modified since v8, but are included for
|
||||||
|
completeness.
|
||||||
|
|
||||||
|
### State resolution
|
||||||
|
|
||||||
|
{{% rver-fragment name="v2-state-res" %}}
|
||||||
|
|
||||||
|
### Authorization rules
|
||||||
|
|
||||||
|
{{% rver-fragment name="v8-auth-rules" %}}
|
||||||
|
|
||||||
|
### Event IDs
|
||||||
|
|
||||||
|
{{% rver-fragment name="v4-event-ids" %}}
|
||||||
|
|
||||||
|
### Event format
|
||||||
|
|
||||||
|
{{% rver-fragment name="v4-event-format" %}}
|
||||||
|
|
||||||
|
### Handling redactions
|
||||||
|
|
||||||
|
{{% rver-fragment name="v3-handling-redactions" %}}
|
||||||
|
|
||||||
|
### Canonical JSON
|
||||||
|
|
||||||
|
{{% rver-fragment name="v6-canonical-json" %}}
|
||||||
|
|
||||||
|
### Signing key validity period
|
||||||
|
|
||||||
|
{{% rver-fragment name="v5-signing-requirements" %}}
|
||||||
@ -0,0 +1,28 @@
|
|||||||
|
{
|
||||||
|
"$ref": "unsigned_pdu_base.json",
|
||||||
|
"hashes": {
|
||||||
|
"sha256": "thishashcoversallfieldsincasethisisredacted"
|
||||||
|
},
|
||||||
|
"signatures": {
|
||||||
|
"example.com": {
|
||||||
|
"ed25519:key_version": "these86bytesofbase64signaturecoveressentialfieldsincludinghashessocancheckredactedpdus"
|
||||||
|
},
|
||||||
|
"resident.example.com": {
|
||||||
|
"ed25519:other_key_version": "a different signature"
|
||||||
|
}
|
||||||
|
},
|
||||||
|
"auth_events": [
|
||||||
|
"$urlsafe_base64_encoded_eventid",
|
||||||
|
"$a-different-event-id"
|
||||||
|
],
|
||||||
|
"prev_events": [
|
||||||
|
"$urlsafe_base64_encoded_eventid",
|
||||||
|
"$a-different-event-id"
|
||||||
|
],
|
||||||
|
"type": "m.room.member",
|
||||||
|
"state_key": "@alice:example.com",
|
||||||
|
"content": {
|
||||||
|
"membership": "join",
|
||||||
|
"join_authorised_via_users_server": "@arbitrary:resident.example.com"
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,18 @@
|
|||||||
|
{
|
||||||
|
"$ref": "core/state_event.json",
|
||||||
|
"type": "m.room.join_rules",
|
||||||
|
"state_key": "",
|
||||||
|
"content": {
|
||||||
|
"join_rule": "restricted",
|
||||||
|
"allow": [
|
||||||
|
{
|
||||||
|
"type": "m.room_membership",
|
||||||
|
"room_id": "!other:example.org"
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"type": "m.room_membership",
|
||||||
|
"room_id": "!elsewhere:example.org"
|
||||||
|
}
|
||||||
|
]
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,12 @@
|
|||||||
|
{
|
||||||
|
"$ref": "m.room.member.yaml",
|
||||||
|
"content": {
|
||||||
|
"membership": "join",
|
||||||
|
"avatar_url": "mxc://example.org/SEsfnsuifSDFSSEF",
|
||||||
|
"displayname": "Alice Margatroid",
|
||||||
|
"join_authorised_via_users_server": "@bob:other.example.org"
|
||||||
|
},
|
||||||
|
"unsigned": {
|
||||||
|
"age": 1234
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -1 +1 @@
|
|||||||
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|
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|
||||||
Binary file not shown.
|
Before Width: | Height: | Size: 28 KiB After Width: | Height: | Size: 31 KiB |
Loading…
Reference in New Issue