Endpoint guards (defense-in-depth over hidden UI):
- POST /api/auth/change-password: 400 with SSO-aware message if
the caller's stored password is not a real bcrypt/argon2 hash.
Prior behaviour was to fail at passwords.verify() with an
ambiguous "current password is incorrect".
- POST /api/auth/setup-2fa: 400 with same SSO-aware message for
SSO-only accounts. Prior behaviour allowed TOTP setup on an
account where it could never actually trigger (user never logs
in locally).
OIDC account-link safety (src/routes/oidc.js):
- Auto-link to an existing local account now requires the IdP to
assert email_verified=true in the ID token (or userinfo). If
absent/false, the callback redirects with ?error=email_unverified.
Prevents an attacker at a misconfigured IdP from taking over a
local account by claiming an email they don't own.
- If an existing user already has oidc_sub set and the incoming
sub is different, refuse with ?error=sub_mismatch. Prior
behaviour silently did nothing, hiding a potential attack.
- Audit 'oidc_linked' written on first successful link.
Frontend:
- Added user-facing messages for the two new SSO error codes.
fc17032649