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swarm: publish minted OIDC client secrets into the swarm store

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A hive that does not host authelia has no path to its own agent queue
client secret. The mint writes the plaintext to a host directory whose
other reader lives in a different container, so the host that mints is
the only place both trees are addressable — which is where this unit
runs.

Four pieces, in the order they depend on each other: the leaf
(glue-bao-tls.nix signs it, because the thing that owns a private key
owns issuing from it), the module declaring its own cert/key options,
the one-pairing glue file pointing them at that leaf, and the imports.

The unit is gated on holding a client identity, never on
deploy.bao.enable — that option is the co-location assumption itself,
and the publisher is the case that assumption excludes.

The secret is passed to bao as `value=@<path>`, never as an argv
element: bao is an external binary, so an argument is world-readable in
/proc for the life of the call.

Refs #3853
This commit is contained in:
atlas 2026-09-11 23:11:05 +02:00
commit eaa52ef200
4 changed files with 223 additions and 0 deletions
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42
nix/host-modules/glue-secret-publisher-bao-identity.nix Normal file
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# Glue: point the secret publisher at the bao leaf minted for it.
#
# ONE PAIRING PER FILE — publisher ← bao, and nothing else. Deleting this
# leaves a publisher that takes operator-provided certificate paths, which is
# what any deployment not minting its own already does.
#
# ⚠️ The minting is NOT here. ./glue-bao-tls.nix holds the CA and signs the
# leaf, because the thing that owns a private key owns issuing from it. What
# belongs here is the pairing: which paths this host's publisher reads.
#
# ⚠️ Gated on the leaf existing, not on the store being enabled — the same rule
# ./glue-controller-bao-identity.nix states. A publisher on the store's own
# host is one deployment; a publisher beside a remote authelia holding a leaf
# issued out of band is another, and both want this wiring.
#
# Everything is `mkDefault`. An operator naming their own paths wins.
{
lib,
config,
...
}:
let
hyperhiveCfg = config.services.hyperhive;
deployCfg = hyperhiveCfg.deploy;
baoDeploy = deployCfg.bao;
# Where ./glue-bao-tls.nix puts the leaves, derived from the reader's own
# path rather than repeating that file's directory literal: an operator who
# moves the PKI moves both, and the two cannot drift apart.
haveMintedPki = baoDeploy.clientCertFile != null;
pkiDir = if haveMintedPki then builtins.dirOf baoDeploy.clientCertFile else null;
in
{
config =
lib.mkIf (hyperhiveCfg.enable && deployCfg.swarm-secret-publisher.enable && haveMintedPki)
{
services.hyperhive.deploy.swarm-secret-publisher = {
baoClientCertFile = lib.mkDefault "${pkiDir}/secret-publisher.pem";
baoClientKeyFile = lib.mkDefault "${pkiDir}/secret-publisher-key.pem";
};
};
}