Low-severity cluster hardening from audit 0008:
- Route secret out of argv (N1-low): --cluster-pass and a nats://user:pass@host in
--routes are visible in ps/journald. New --cluster-pass-file and the
UNIBUS_CLUSTER_PASS env var (precedence file > env > flag); the resolved secret
guards the route layer and is injected into bare --routes entries
(injectRouteCreds), so peers can be listed as nats://host:6250 with no secret in
argv. The legacy --cluster-pass stays for dev/compat.
- migrate-to-kv confidentiality (N6): refuse a remote --nats-url without --ca (the
allowlist would travel cleartext); loopback targets are exempt (isLoopbackURL).
- Docs (N1 route CA, N3 DoS): deploy/README gains a Clustering section — use a
SEPARATE cluster CA for routes (not the client CA), keep the secret out of argv,
run migrate-to-kv loopback/TLS only, and R1 is a SPOF of auth (not HA); R3
quorum is real HA. The generated cert material lives in deploy/cluster/ (0006g).
Tests:
- TestResolveClusterPass (file > env > flag precedence; missing file errors),
- TestInjectRouteCreds (injects only into userinfo-less routes; preserves overrides),
- TestIsLoopbackURL (loopback vs remote vs malformed).
CGO_ENABLED=0 go build/vet/test green; govulncheck 0 reachable.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
egutierrez
b8201a82cd