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swarm-nats-auth: read its own OIDC client secret from the store

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The responder reads its OIDC client secret at
`swarm/services/<client-id>/oidc/client` with the store login it already
opens for the callout keys, and holds it in memory. `--client-secret-file`
is removed.

When introspection answers non-2xx, the responder re-reads the secret from
the store once and, if it changed, retries the introspection once. Both fit
inside the request's 1.5s introspection budget, under the server's 2s
callout timeout: the budget is now one deadline for the whole request. A
re-read that does not finish by then keeps running in the background, the
request is denied, and the next request introspects with what it read. One
re-read runs at a time; a refusal while one runs waits on it.

In swarm-nats.nix the `swarm-bao-nats-auth-oidc` fetch unit, the flag and
the `oidc-client.secret` LoadCredential entry are gone, along with the
unit's policy ordering in glue-bao-readers-policy-order.nix. A tmpfiles `r`
rule removes the copy a container still holds at
/var/lib/nixos-containers/swarm-nats/var/lib/swarm-nats-auth/oidc-client.secret;
nothing reads it.

No policy change: the `swarm-nats-auth` role already reads this path
(`natsAuthReaders` in swarm-bao.nix), which is the role the removed fetch
unit logged in as.

Deploy order: none, and no operator step. The store's grant already exists,
so the queue host can be deployed before, after or without the store's host
and authelia's. Rolling back re-creates the fetch unit and the file; the
store leaf is untouched.
This commit is contained in:
atlas 2026-10-06 13:43:14 +02:00
commit 6646329da5
12 changed files with 557 additions and 253 deletions
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2
nix/host-modules/swarm-bao.nix
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@ -866,7 +866,7 @@ let
# presents against the one stored for it. One leaf under every agent: `+` is
# one path segment, where `*` globs only at the end and would reach every
# other credential an agent holds. Plus the responder's own OIDC client
# secret, which `swarm-bao-nats-auth-oidc` reads under this same leaf.
# secret, which it reads as it starts and again when the IdP refuses it.
#
# And the two leaves of each callout key, which `ensure-callout-keys`
# creates when the store holds no seed. `create` without `update`, so a