Implements the ratified #295 design (PR1, server-only, backward compatible). The
/api surface now accepts a valid X-Api-Key (machine) OR an authenticated session
(browser cookie, local login or OIDC), gated by the evolved ApiAuthorizationFilter
(renamed from ApiKeyAuthorizationFilter; same fail-closed EndpointRequiresKey
predicate). Machine/key behavior is byte-identical and the SPA keeps working via
its stored key — the SPA login flow lands in PR2.
- ApiAuthorizationFilter: key-first (CSRF-immune) then session; session-authed
mutations require the X-CSRF header (403 otherwise). Attributes renamed
[RequiresApiKey]->[RequiresAuthentication], [SkipApiKeyAuthorization]->[SkipApiAuthorization].
- Cookie scheme ctv-session always registered (Lax/SameAsRequest/14d sliding, 401 not
redirect for /api); OIDC handler revived when configured (profile scope, userinfo,
auth-method claim); UseAuthentication/UseAuthorization/UseRateLimiter revived in the
legacy MapWhen branch.
- Local admin = single credential in ConfigElement rows (username / PBKDF2 hash via
Microsoft.Extensions.Identity.Core / rotating security stamp) — NO DB migration.
Password change rotates the stamp; CookieSecurityStampValidator revokes stale local
sessions. Env-seed recovery (Auth:LocalAdmin:*) via LocalAdminSeedService.
- AuthController /api/auth/{config,session,setup,login,logout,password} + browser-nav
GET /auth/oidc/login; excluded from OpenAPI (machine-audience spec). Per-IP rate limit
on login/setup/password; dummy-hash verify (no user enumeration).
- ForwardedHeaders now strict opt-in: X-Forwarded-* ignored unless KnownProxies/Networks
configured (rate-limiter IP + cookie-Secure integrity). Deployment: operators behind a
proxy must set ForwardedHeaders:KnownProxies.
- Tests: session/CSRF filter cases + 17 Application/Auth handler tests; full ErsatzTV.Tests
green (1499). No OpenAPI/generated-artifact drift.
- Docs: api-conventions section 9 rewritten; decisions.md entry (supersedes #206 inert-OIDC note).
Refs #295#197#206#58
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
