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swarm-logs-auth: check agent tokens on the log store's query route

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A new `auth_request` responder on the log store's host. nginx sends it
every `/select/logsql/` request whose `Authorization` is
`Bearer swarm-agent.<agent>.<secret>`; it answers 200 when the secret is
the one stored at `swarm/agents/<agent>/queue` (`swarm-agent-verify`),
401 otherwise. Every other bearer still goes to authelia, so agents
still presenting the hive's shared OIDC client keep working.

`auth_request` takes a fixed URI, so the split is a `map` on
`$http_authorization` plus an internal location that rewrites to the
map's pick. Checked against nginx 1.30.5 with stub upstreams: an agent
token only the stub validator accepts gets 200, a token only the stub
authelia accepts gets 200, every wrong one 401, and the internal
locations 404 from outside.

The responder serves a unix socket in its own traverse-only runtime
directory and reads the store under its own leaf
(`swarm-logs-auth`), whose policy is `swarm/agents/+/queue`, read-only.
glue-bao-tls mints the leaf where the store runs; elsewhere the
operator places it, and eval refuses a log store host without one.

Part of #4459.
This commit is contained in:
atlas 2026-10-12 22:48:19 +02:00 • committed by mara
commit 1f4736e79b
1 changed files with 515 additions and 9 deletions
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31
nix/host-modules/glue-logs-auth-bao-identity.nix Normal file
View file

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# Glue: point the log store's agent auth responder at the bao leaf minted for it.
#
# ONE PAIRING PER FILE — the swarm-logs-auth principal ← bao, and nothing else.
# Deleting this leaves a log store with no responder identity unless the
# operator names one, which ./swarm-victorialogs.nix refuses at eval.
#
# ⚠️ 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 store running on this host, the only place the leaf is
# minted. A log-store host without the store gets no default here; the
# operator places the responder's leaf and names it.
#
# Everything is `mkDefault`. An operator naming their own paths wins.
{
lib,
config,
...
}:
let
deployCfg = config.services.hyperhive.deploy;
pkiDir = import ./lib/bao-pki-dir.nix;
in
{
config = lib.mkIf (deployCfg.victorialogs.enable && deployCfg.bao.enable) {
services.hyperhive.deploy.victorialogs = {
authBaoClientCertFile = lib.mkDefault "${pkiDir}/logs-auth.pem";
authBaoClientKeyFile = lib.mkDefault "${pkiDir}/logs-auth-key.pem";
};
};
}