The CLINCH_HOST initializer raised during `assets:precompile` in the
Docker build, where no real host is set. Skip the check when
SECRET_KEY_BASE_DUMMY is present (the build-time precompile step);
deployed boots still require CLINCH_HOST.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
determine_base_url fell back to request.host when CLINCH_HOST was unset. Rails
resolves request.host from X-Forwarded-Host behind a trusted proxy, so a spoofed
header could make the forward-auth login redirect point at an attacker origin
(host-header phishing).
- Add config/initializers/clinch_host.rb: fail fast at boot in any non-local
environment when CLINCH_HOST is blank. It anchors the OIDC issuer, WebAuthn
RP ID, and login redirect, so it must be explicit, never inferred.
- determine_base_url now uses CLINCH_HOST (guaranteed in production) with a safe
localhost default for dev/test, and never reads the request host.
- Simplify the spoofed-host regression test now that the fallback is safe.
Verified: production boot aborts with a clear message when CLINCH_HOST is blank,
and boots normally when set.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
