External authentication (ADR 0021) built on jose (#188's vetted library)
plus fetch — no new dependency enters the supply chain for a security
base function. Discovery-configured; ID tokens validate against the
IdP's JWKS under an explicit RS256/ES256 allowlist with issuer,
audience, expiry and nonce binding. State, nonce and the PKCE verifier
travel in a signed HttpOnly Lax cookie keyed by a dedicated HKDF
purpose (oidc-state, ADR 0020).
Deploy-level configuration (OIDC_ISSUER/CLIENT_ID/CLIENT_SECRET/SCOPES/
PROVIDER_LABEL): who authenticates users is a platform decision. The
login page discovers the provider via GET /auth/methods and renders the
SSO button (i18n de+en).
Identities use the existing slot (provider oidc:<issuer>, subject from
the token). First login creates the account just-in-time — ACTIVE and
mail-verified only when the IdP asserts a verified address. An existing
local account is NEVER adopted silently by e-mail (account-takeover
path): login refuses with oidc_link_required and the owner links
explicitly via GET /auth/oidc/link (audited auth.identity_linked,
catalogue v1.3). Sessions come from the one existing session service.
Tests run the full flow against a protocol-faithful fake IdP: PKCE
verifier at the token endpoint, JIT creation incl. personal pond,
invalid state/nonce/signature/issuer/audience/expiry each rejected, the
linking refusal and the explicit link flow. Verified end-to-end against
a real Keycloak 26.0 (repeatable procedure documented in security.md
§External authentication).
Refs #214.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AUtYMxwTCMHG9mVHnwbFg8
The web app grows its account surface: login (with next-redirect,
unverified-hint + resend), signup (react-hook-form + shared Zod
schemas, field-level api errors, closed-registration state fed by the
new public GET /auth/registration), e-mail verification, forgot/reset
password; a settings page with profile (locale applies immediately),
password change, and active-session management; a Site-Admin page for
instance name, default locale, and registration mode. AuthProvider
holds /auth/me, applies the profile locale, and backs route guards
(RequireAuth/RequireAnonymous/RequireSiteAdmin); the top bar gains a
user menu. All strings ship in the new auth/settings namespaces (de+
en); the exception filter now preserves handler-specific error codes.
Verified live: signup → Mailpit → verify → login → profile through
the Vite proxy.
Closes#16Closes#17Closes#18Closes#19
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
