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swarm-controller: revoke matrix admin from former operators

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The operator admin sync now also takes homeserver admin away. It records
each user id it sends `make-user-admin` for in
`operator-matrix-admins.json` under the controller's state directory
(written to a temporary file and renamed over it; a missing file is an
empty set). On each pass, a recorded account that is no longer in
authelia's `admins` group but is still joined to `#admins:<server>` is
sent `!admin users force-leave-room <user> <admin room id>` as `@swarm`,
over the same `/_matrix` path the grant uses. Leaving that room is what
ends tuwunel admin.

It never revokes an admin it didn't grant, `@swarm`, tuwunel's server
user (`@conduit:<server>`), an agent's account (the store's
`hive-agent-*` cert roles, the same roster the agent account mint uses),
or anyone in the new `services.hyperhive.swarm.matrix.adminSync.ignoreUsers`
list. That list reaches the daemon as
`SWARM_CONTROLLER_MATRIX_ADMIN_SYNC_IGNORE_USERS`. It also never sends a
revoke that would leave `#admins` with no member besides `@swarm` and the
server user.

A revoke is sent at most once per account per controller process, like a
grant. A recorded account that is out of both the group and the room is
dropped from the file.

Closes #4799
This commit is contained in:
atlas 2026-10-05 10:27:57 +02:00 • committed by mara
commit 962c1548eb
8 changed files with 515 additions and 41 deletions
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7
swarm-controller/src/main.rs
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@ -8,9 +8,10 @@
//! `load_hives`. A config change means a redeploy, same as every other
//! option this process reads.
//!
//! The one thing it does persist is `webhook-secret` under its
//! `StateDirectory` (see `webhook`), because that key is handed to Forgejo
//! at registration and so cannot be regenerated per boot.
//! It persists `webhook-secret` under its `StateDirectory` (see `webhook`),
//! because that key is handed to Forgejo at registration and so cannot be
//! regenerated per boot, and the operator admin sync's granted set beside it
//! (see `matrix_account::operator_admin`).
//!
//! Distinct from `hive-c0re`, which is per-hive: c0re owns the agents on
//! one host, this owns what is true across hives.