ADR-003 locked the auth substrate; ADR-006 ratifies the operator
playbook + adds two implementation pieces needed for Sprint 4
deployment: env-resolved tokens and dual-token rotation.
Six decisions locked in docs/DECISIONS.md:
- 6.1: Non-loopback bind requires auth.token (mechanical gate at
shared.Run, already implemented; this ratifies it).
- 6.2: Token from env, not TOML. /etc/lakehouse/auth.env (mode 0600)
loaded by systemd EnvironmentFile=. New TokenEnv field on
AuthConfig defaults to "AUTH_TOKEN".
- 6.3: AllowedIPs for inter-service same-trust-domain; Token for
cross-trust-boundary (gateway ↔ external).
- 6.4: /health stays unauthenticated; everything else under
shared.Run is gated. Already implemented; ratified here.
- 6.5: Token rotation is dual-token. New SecondaryTokens []string
on AuthConfig — both primary and any secondary pass auth
during the rotation window. Implemented in this commit.
- 6.6: TLS terminates at the network edge (nginx/Caddy), not
in-process. Daemons stay HTTP-only; internal traffic stays
on private subnets per Decision 6.3.
Implementation:
- internal/shared/config.go: AuthConfig gains TokenEnv +
SecondaryTokens fields. New resolveAuthFromEnv() called by
LoadConfig fills Token from os.Getenv(TokenEnv) when Token is
empty. TokenEnv defaults to "AUTH_TOKEN" so the happy path needs
no TOML config.
- internal/shared/auth.go: RequireAuth pre-encodes Bearer headers
for primary + every secondary token; per-request constant-time
compare walks the slice. Fast path is 1 compare (primary).
Tests:
- TestLoadConfig_AuthTokenFromEnv (3 sub-tests): default env name,
custom token_env, explicit Token wins over env.
- TestRequireAuth_SecondaryTokenAccepted: both primary + secondary
tokens pass during rotation window.
- TestRequireAuth_SecondaryTokensOnly: only-secondary path works
for the case where primary was just promoted-to-empty mid-rotation.
go test ./internal/shared all green; existing auth_test.go
unchanged (constant-time compare path preserved).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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