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swarm-nats-auth: limit agent subscribe to its own inbox and input

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An agent's queue credential could subscribe to every subject in the swarm
account, so any agent could read every other agent's terminal, turn state,
operator input and request replies. Agents are the least trusted clients
on the queue (mara's ruling on #4901), so their grants now carry a
subscribe allow-list:

- an agent's own credential (the harness and its subagent daemon):
  `_INBOX.agent.<agent>.>` and `$SWARM.input.<agent>`
- the hive's shared agent client: `_INBOX.client.<client-id>.>`

Hive and swarm-controller grants are unchanged (no `sub` claim, so still
every subject).

The clients connect with the matching inbox prefix, so the replies they
rely on still arrive: the icon write's JetStream ack and the schedule
DIRECT.GET. `connect_with_token` takes the agent name and sets the prefix
itself; the hive-shared fallback uses the new
`connect_with_inbox_prefix`.

The harness no longer subscribes to its input subject when it fell back
to the hive's shared client: that identity names no agent, so it cannot
be granted one agent's input without all of them. It logs that and
skips, the same as the schedule reader on that path.

Refs #4901
This commit is contained in:
atlas 2026-10-04 18:05:44 +02:00 • committed by mara
commit 52037133e2
8 changed files with 236 additions and 33 deletions
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10
docs/swarm/README.md
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@ -233,6 +233,16 @@ key. Swarm-side, `GET /api/agents/<name>/icon` serves the stored bytes, and 404
means the agent has no icon. swarm-ui's agent cards load it as an `<img>` and show the
dimmed hyperhive mark for an agent without one, as the hive dashboard does.
The queue also limits what an agent may **subscribe** to, because agents are the
least trusted clients on the queue. An agent's own queue credential, which its
subagent daemon also presents, may subscribe to its reply inbox
`_INBOX.agent.<agent>.>` and its operator-input subject `$SWARM.input.<agent>`,
and nothing else. The hive's shared agent client may subscribe to its reply
inbox `_INBOX.client.<client-id>.>` only. Each connects with its prefix as its
inbox prefix, so the replies to the icon write and the schedule read arrive.
Neither can read another agent's terminal, state, input or replies. Hives and
the swarm controller may still subscribe to any subject in the account.
</details>
### Swarm-wide forge objects