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matrix: the agent's daemon pulls its linked accounts from bao itself

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hive-matrix-daemon now learns which external matrix accounts it has from
the swarm secret store, under the agent's own certificate, and the hive
push chain for matrix is gone.

The daemon lists swarm/agents/<agent>/matrix/ (the `list` its policy
grants on its own metadata subtree), reads each account's homeserver
from its credential, and brings the accounts up with their tokens from
the store. Every two minutes it lists again and exits with 75 when the
set of linked accounts changed; the unit restarts on 75 without counting
a failure. A listed name whose credential reads as absent is skipped and
logged once. At start it removes the matrix-token-<a> /
matrix-account-<a>.json pairs a hive delivered (a sidecar marks a pair
as delivered; a declared tokenFile keeps its token).

Removed: CredentialNotice and the $SWARM.credential.* subject and NATS
grant, the controller's publish and its queue precondition on the PUT
route, hive-c0re's credential subscription arm and workers/credential.rs,
priv_client::write_agent_matrix_token, hive-priv's WriteAgentMatrixToken
and its helpers, and the daemon's state-dir account discovery.

Kept: WriteAgentGithubToken and the external-forge path
(WriteAgentExtraForgeAccount, extra_forges.rs) are untouched, and a
declared matrixAccounts tokenFile is still read when the store has no
token for that account.

Refs #4348
This commit is contained in:
atlas 2026-10-01 17:41:20 +02:00
commit 97fb76ce99
22 changed files with 553 additions and 813 deletions
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3
docs/trust-boundary/security.md
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@ -295,11 +295,10 @@ known operations; there is no arbitrary command pass-through:
| `RemoveServiceDropin` | remove `container@<name>.service.d/` drop-in on destroy |
| `DaemonReload` | `systemctl daemon-reload` |
| `RunForgeAdmin` | `nixos-container run hive-forge -- runuser -u forgejo -- forgejo admin <args>` |
| `WriteAgentMatrixToken` | write `0600` credential file into agent state dir |
| `ControlInfraContainer` | `systemctl <action> container@<container>.service` — the `InfraContainer` enum is the allowlist, and serde rejects unknown names at the wire boundary (`hive-c0re` has no variant, so no request can name it) |
| `SyncAgentTmpfiles` | legacy: unlink `/etc/tmpfiles.d/hyperhive-agents.conf` and return `Ok`; kept one release for an older hive-c0re |
| `SetAgentPaused` | create / remove the `<state>/<name>/harness/paused` marker that parks an agent's turn loop |
| `WriteAgentGithubToken` | write `0600` `github-token` into agent state dir (same semantics as the forge/matrix token writes) |
| `WriteAgentGithubToken` | write `0600` `github-token` into agent state dir (same semantics as the extra-forge account writes) |
| `WriteAgentExtraForgeAccount` / `DeleteAgentExtraForgeAccount` | write / remove `forge-<label>-token` + a `forge-<label>.json` base-URL sidecar, both `0600`. hive-priv validates `label` as a plain identifier before it reaches the filename — an unchecked one traverses out of the state dir |
| `RegisterCiRunner` | write `/run/hive-ci/runner-token` (host path, root-owned) then `systemctl --machine=hive-ci restart gitea-runner-hive.service`. Only the registration token crosses; the forge admin token never enters the container |
| `EnsureAgentSubvolume` | `btrfs subvolume create <state>/<name>` for a new agent — no-op when the path exists or the filesystem isn't btrfs |