* feat(auth): OIDC logout-to-IdP — phase 3 (#798)
RP-initiated logout behind a new oidc_logout_from_idp setting: logging
out of PicPeak also ends the IdP session. The SSO callback stores the
raw ID token in an HttpOnly cookie (also the marker that the session
came in via SSO — local-password sessions never bounce to the IdP);
/logout builds the end_session URL from discovery metadata with
id_token_hint + post_logout_redirect_uri + client_id and returns it as
ssoLogoutUrl for the frontend to navigate to. Any failure (no
end_session_endpoint, IdP unreachable, feature off) degrades to the
plain local logout.
Settings surface exposes the toggle plus the computed post-logout
redirect URI to register at the IdP. Session timeouts deliberately stay
local-only.
6 integration tests over the mock IdP; live-verified against
Keycloak 26 (logout ends the Keycloak session, no confirmation prompt).
* fix(auth): harden the SSO logout marker cookie (#798 phase 3)
Codex review round 1:
- Derive the oidc_id_token cookie options from the shared cookie policy
(COOKIE_SAMESITE / COOKIE_DOMAIN / secure resolution) — hardcoded Lax
meant split-origin deployments running on SameSite=None never sent the
marker to the cross-site /logout XHR, silently disabling logout-to-IdP.
- Oversized ID tokens (>3.9KB) now store a bare 'sso' marker instead of
no cookie, so the claimed client_id-only end-session fallback actually
happens; /logout only passes the value as id_token_hint when it is a
real JWT.
- establishAdminSession clears any stale marker on every fresh login —
sessions can die without /logout (deactivation, expiry, restore), and
a surviving marker would bounce a later local-password session to the
IdP. The SSO callback re-sets the marker for its own session.
Tests: oversized-token marker + hint-less end-session URL, stale-marker
cleared on local login; helper updated for the clear+set cookie pair.
* fix(auth): validate the logout hint against the current OIDC config (#798 phase 3)
Codex review round 2: an ID token stored at login can outlive an
issuer/client config change; sending it to the newly configured IdP as
id_token_hint strands the user on the IdP's error page (providers
validate iss/aud on the hint). buildEndSessionUrl now decodes the hint
(no verification — routing only): different issuer → skip the round-trip
entirely (the session belongs to another IdP); same issuer but changed
client → keep the round-trip, drop the unusable hint. Two tests pin both
paths.
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Co-authored-by: Paul Nothaft <paul@MacStudio-von-Paul.local>
Paul Nothaft
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