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swarm-nats-auth: verify an agent's own token against the store

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An `auth_token` spelled `swarm-agent.<agent>.<secret>` is no longer sent
to introspection. The responder reads `swarm/agents/<agent>/queue` with
an identity of its own, checks that the stored object names the same
agent, compares the secret in constant time, and grants the subjects
`--agent-token-publish-subject` lists with `{agent}` expanded. Every
other outcome denies: a malformed token, no store identity, nothing
stored, a failed or slow lookup, a different secret. A token without
the prefix takes the OIDC path unchanged.

The journal's `auth request` line names such a caller `agent:<agent>`;
the hive-shared credential keeps `hive-<h>-agent`.

The new principal: a `swarm-nats-auth` cert-auth role and policy with
read on `secret/data/swarm/agents/+/queue` alone, a leaf signed by the
store's PKI glue, and `glue-nats-auth-bao-identity.nix` pairing the two.
The copy unit delivers the identity into the queue's container, and an
absent leaf is delivered empty so the responder still starts and only
agent tokens are refused.

The policy and role are written by `swarm-bao-nats-auth-policy`, logged in
as the bao granter: both names fall under its `swarm-*` globs, so the
deploy writes them with no operator step. module-eval counts it among the
granting units, so every generic granting-unit case covers it.

The secret compare uses `subtle`, already in the lock file through the
TLS stack; no workspace crate offered one directly.
This commit is contained in:
atlas 2026-09-27 20:38:34 +02:00
commit 9bad58d86d
14 changed files with 846 additions and 51 deletions
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37
nix/host-modules/glue-nats-auth-bao-identity.nix Normal file
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# Glue: point the queue's auth-callout responder at the bao leaf minted for it.
#
# ONE PAIRING PER FILE — the swarm-nats-auth principal ← bao, and nothing else.
# Deleting this leaves a responder with no store identity unless the operator
# names one: every agent token is then denied, and OIDC clients are unaffected.
#
# ⚠️ The minting is NOT here. ./glue-bao-tls.nix holds the CA and signs the
# leaf. What belongs here is the pairing: which paths the responder presents.
#
# ⚠️ Gated on the leaf existing, not on the store being enabled, for the reason
# ./glue-nats-bao-identity.nix states: the hive hosting the queue need not be
# the hive hosting the store.
#
# 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.
haveMintedPki = baoDeploy.clientCertFile != null;
pkiDir = if haveMintedPki then builtins.dirOf baoDeploy.clientCertFile else null;
in
{
config = lib.mkIf (hyperhiveCfg.enable && deployCfg.nats.enable && haveMintedPki) {
services.hyperhive.deploy.nats = {
authBaoClientCertFile = lib.mkDefault "${pkiDir}/nats-auth.pem";
authBaoClientKeyFile = lib.mkDefault "${pkiDir}/nats-auth-key.pem";
};
};
}