Unit-test the handoff library (mint stores only the hash + binds the
challenge + 90s TTL; consume covers not-found / replay-with-revoke /
expiry-burn / PKCE-burn / atomic consume / lost-race), the
token-exchange route (rate limit, transport gate, one identical generic
401 across every invalid-code class, success with issued-hash stamp +
audit, and OIDC_ONLY does not block it), the callback native branches
(handoff mint + scheme redirect with no session, MFA ticket on the
scheme with no session/cookie, post-identity + IdP errors to the
scheme, CSRF web-fallback), the login native-param handling, and the
by-hash refresh-token revoke used for replay containment.
The web OIDC flow ends in a session cookie the Bearer-transport native
client cannot consume, so on an OIDC_ONLY instance the iOS app had no
sign-in. Add a native leg: the app opens the login URL with
client=native and its own PKCE S256 challenge inside an in-app browser;
the callback resolves identity exactly as before, then mints a one-time
handoff code and 302s to the fixed compiled-in scheme
healthlog://oidc-callback (or hands back the existing MFA ticket when
the account has a second factor). The app exchanges the code plus its
PKCE verifier at POST /api/auth/oidc/native/token for the standard
native token bundle.
The return address is a compile-time constant — no redirect_uri
parameter and no env allowlist, so the open-redirect / scheme-hijack
class is removed by construction. The native flag and app challenge
travel only inside the AES-256-GCM state blob, so a network attacker or
the IdP cannot flip a web login into a native one. The handoff code is
256-bit CSPRNG, HMAC-hashed at rest, 90-second TTL, single-use via a
guarded consume; a failed PKCE check burns it. A replay of a consumed
code revokes exactly the pair the first exchange issued. The token pair
never rides a URL; only the opaque code or the MFA ticket do. The SSO
login can never satisfy requireFreshMfa step-up — the transport is
Bearer and step-up is cookie-only.
Adds the OidcNativeHandoff model (migration 0252), the token-exchange
route, a daily cleanup sweep, and the OpenAPI entry.
Every browser-facing redirect in the OIDC login/callback routes was built
from req.url. Behind a reverse proxy that doesn't forward the original
host, that reflects the address the app process was addressed as inside
the container rather than the public domain, sending users to an
unreachable internal URL after login. Route every redirect through the
trusted, operator-set NEXT_PUBLIC_APP_URL instead, matching the
convention the Withings integration already uses.
From the campaign's security re-verification pass (posture otherwise held
across the 10-release week — no Critical/High):
- MEDIUM: the OIDC auto-provision branch re-introduced the first-admin race
the password-register route fixed in v1.28.42 — count-then-create with no
lock, so two concurrent OIDC first-logins (or an OIDC first-login racing a
password first-registration) in the empty-DB window could both mint ADMIN.
Now wraps count+role+create in a $transaction taking the SAME advisory lock
key ('register:first-admin') and re-counts inside, so the two paths
serialise; every provisioned field preserved.
- LOW: the nutrients batch catch echoed the raw exception message into the
client-facing reason (violating its closed reason-set). Now returns the
fixed 'upsert_failed' member and logs the detail server-side only.
No migration (advisory lock is runtime).
Token verification: jwtVerify now carries a closed asymmetric algorithm
allowlist (RS256/PS256/ES256/EdDSA — an HMAC alg would let anyone with
the client secret forge identities) and a 60 s clock tolerance for the
usual self-host drift between IdP and app box. The JWKS fetch — jose's
own, outside safeFetch by design — is disciplined instead by pinning
the jwks_uri host to the configured issuer's host byte-exact and
passing the same 15 s timeout safeFetch defaults to. requirePublicHost
stays deliberately unused on this surface: LAN/Tailscale-only IdPs are
a legitimate topology and the issuer is operator config, not user
input.
Discovery: the issuer comparison now tolerates exactly one trailing
slash on either side (a recurring IdP/operator mismatch); token
verification still matches the provider-sent issuer byte-exact.
State cookie: the cookie is set under Path=/api/auth/oidc but was
deleted without a path — RFC 6265 keys cookies by (name, domain,
path), so the deletion never matched and the single-use blob survived
its whole TTL. Every delete now repeats the exact path, via a shared
constant.
Also: the IdP error code recorded in the wide event is whitelisted
against the closed OAuth error-code set (unknown values collapse to
"other"); the status route drops an unreachable try/catch and a
duplicated annotate; the passkey conditional-UI autofill stays unarmed
under OIDC_ONLY (passkey login is a server-enforced dead end there);
env-manifest gains the three optional OIDC_* tuning vars; the env
example notes why the issuer should be HTTPS.
Two second-factor gaps in the OIDC callback:
The session was minted with mfaVerifiedAt stamped to the login instant,
letting a bare SSO login satisfy requireFreshMfa step-up (MFA disable,
encryption-key rotation, encrypted export, account deletion). OIDC is a
delegated factor — whatever the IdP checked, this app did not see a
second factor — so the stamp is now null, the same treatment a
trusted-device login gets.
An account with a confirmed TOTP secret or a registered security key
was logged straight in, silently downgrading its native 2FA to
IdP-only. The callback now mints the same single-use MFA ticket
password login uses and hands it to the login page through a
short-lived, login-page-scoped cookie (the callback ends on a browser
redirect, so the ticket cannot ride an envelope meta like the password
flow). The login page picks it up once, clears it, and renders the
same challenge step; the login completes at /api/auth/mfa/verify with
identical continuation semantics. The cookie is deliberately not
httpOnly — the login page script must read the ticket, exactly the
exposure the password flow already has — and the ticket alone carries
no session authority (single-use, hashed at rest, 5-minute TTL,
attempt-capped).
Direct (factor-less) OIDC logins now also sync the admin-enforced-MFA
enrollment hint cookie, matching password login.
An OIDC login now resolves the account by the durable (issuer, sub)
pair instead of the email claim. First contact stamps the pair — by
auto-provision or a one-time link against an existing account matched
by verified email — and every later login matches on it alone, so an
IdP-side email change refreshes the display email but can never
re-point the login at a different account. An email that matches an
account already bound to a different identity is rejected and audited
(auth.oidc.link_conflict), never silently re-bound.
The email gate tightens with it: linking and provisioning now require
an explicit email_verified: true — an absent claim is a reject
(oidc_email_unverified) rather than a benefit of the doubt, since an
IdP that does not assert verification cannot anchor the account match.
Provisioned accounts get a lowercased email and the same server-default
timezone resolution the register route uses.
Migration 0240 adds the nullable users.oidc_issuer / users.oidc_sub
columns with a composite unique index.
Adds an OpenID Connect relying-party login path (PKCE authorization-code
flow) against a single env-configured identity provider — additive to
password/passkey login by default, with an operator opt-in (OIDC_ONLY,
enforced server-side on every auth route) to disable them entirely.
First-time sign-in auto-provisions or links an account by verified email.
Closes an open redirect in the post-login `next` parameter (both the new
OIDC path and the pre-existing password/passkey flow shared the same
backslash-normalization bypass) by resolving the target through a real
URL parse and comparing origins instead of a prefix check.
Marc-André Bombeck