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feat: two-factor authentication (TOTP + backup codes)

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Uses better-auth's built-in twoFactor plugin rather than hand-rolling
TOTP — adds the two_factors table and users.twoFactorEnabled, wires
the server/client plugins (allowPasswordless: true so OAuth-only
accounts aren't locked out of managing 2FA), and adds a custom rate
limit for the verify endpoints (5/min — far stricter than the default
100/10s, since a 6-digit code has a much smaller keyspace than a
password).

New Settings → Security section walks through enable (password
confirm -> QR + backup codes -> confirm a live code before it's
actually turned on, per the plugin's default flow) and disable. New
/verify-2fa page handles the post-password mid-login step, with a
backup-code fallback. Verified live end-to-end: enable, confirm,
forced re-auth on next sign-in, TOTP accepted, backup code accepted
(single-use), disable.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Arnaud
2026-07-13 23:08:15 +02:00
parent 4e5f45a7e5
commit acc93de708
17 changed files with 5500 additions and 13 deletions
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apps/web/proxy.ts
+1 -1
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@@ -2,7 +2,7 @@ import { NextRequest, NextResponse } from "next/server";
import { getSessionCookie } from "better-auth/cookies";
import { applyRateLimit } from "@/lib/rate-limit";
const PUBLIC_PATHS = ["/login", "/signup", "/verify-email", "/forgot-password", "/reset-password", "/api/auth", "/r/", "/u/", "/s/", "/docs", "/api/v1/openapi.json", "/api/webhooks", "/api/v1/invites/", "/api/internal/"];
const PUBLIC_PATHS = ["/login", "/signup", "/verify-email", "/verify-2fa", "/forgot-password", "/reset-password", "/api/auth", "/r/", "/u/", "/s/", "/docs", "/api/v1/openapi.json", "/api/webhooks", "/api/v1/invites/", "/api/internal/"];
const ADMIN_PATHS = ["/admin"];
// A public-editable shopping list's own items endpoint — no session cookie to