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swarm-secret-client: hives no longer read swarm/services/*

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The hive policy rendered by policy::render granted every hive cert read
on secret/data/swarm/services/*, which holds each swarm service's OIDC
client secret. No reader of that tree authenticates with a hive cert:
grafana, the otel collector and the store forwarder each read with
their own leaf, and the bao UI's secret is read by the store's granter.

render() now emits two stanzas: swarm/agents/* and the hive's own
swarm/hives/<hive>/*. Kind::Service had no other caller and is removed.
Docs and comments that described the grant as a decision are rewritten
to the current state.

Closes #4960
This commit is contained in:
atlas 2026-10-04 22:32:28 +02:00 • committed by mara
commit 2505008b83
13 changed files with 82 additions and 136 deletions
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3
hive-c0re/src/matrix.rs
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@ -218,8 +218,7 @@ fn persist_sender_token(path: &std::path::Path, access_token: &str) -> Result<()
/// this process's environment, so the store read costs no plumbing through
/// [`ensure_all`]. That name is also the path's own hive segment, which is
/// what makes this read reach **this** hive's token and 403 on any other's:
/// the grant behind it is the hive's own `swarm/hives/<name>/*` stanza, not
/// the swarm-wide `swarm/services/*` one the shared token used to sit under.
/// the grant behind it is the hive's own `swarm/hives/<name>/*` stanza.
///
/// `None`, never an error, for every way this can come up empty — no hive
/// name, no `BAO_*` identity, an unreachable store, nothing at the path. All