Dan Milne 84ed462f40 Require CLINCH_HOST in deployed environments; drop request-host fallback ...

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>

2026-06-11 08:04:42 +10:00

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