SSO login minted a full session immediately, ignoring the account's
totp_enabled flag — so a 2FA admin with a linked Google/Discord/OIDC
identity could sign in without their authenticator code, silently
downgrading the account to single-factor (the strength of the IdP login).
The local password flow already gates on needsTotp(); SSO did not.
Wire SSO through the same staged-TOTP gate:
- ssoState: createTotpPending/verifyTotpPending + a short-lived httpOnly
sso_totp cookie. The pending token carries stage:'totp' (session
validation rejects it) + kind:'sso_totp' (scoped to the SSO endpoint)
plus the resolved context (userId, provider, authMethod, returnTo).
- sso.controller: finishLogin now stages the challenge and redirects to
/admin/login?sso_totp=1 instead of creating a session when the account
has TOTP on. New finishSsoTotp verifies the code (backoff + bot-scoring
on failure, mirroring loginTotp) and only then mints the session.
- sso.routes: POST /auth/sso/totp behind the same backoff/slow/limiter
stack and code validation as the local TOTP endpoint.
- client: AdminLogin detects ?sso_totp=1 and completes over fetch via
api.ssoLoginTotp; the challenge never touches the URL or JS.
Keeps the second factor httpOnly throughout, consistent with the SSO tx
cookie. 12 new tests; full suite 106/106.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019rao86n5cXpwAyjdBFEshV
Claude
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