6dae7adc77
Adds rate limiting to /api/auth/login and /api/auth/register and removes
their wide-open CORS allowlist.
Rate limiting (@upstash/ratelimit + @upstash/redis):
- 5 attempts per 15-minute sliding window per IP, prefix "tcgvault:auth"
- new lib/rate-limit.js, lazy singleton, single source of truth
- reads KV_REST_API_URL / KV_REST_API_TOKEN (Vercel Upstash Marketplace
convention — auto-provisioned, no manual env-var setup needed)
- fail-closed in production if env vars are missing (better to error
one login than silently disable brute-force protection on live)
- fail-open in dev/test if env vars are missing (single console.warn)
- fail-open on Upstash backend outage (defense-in-depth — don't lock
the entire userbase out if Upstash is down)
- IP extracted from x-forwarded-for first hop, with socket fallback;
NOT req.body.email (rotates) or Authorization header (absent on
unauthenticated login)
CORS:
- Removed Access-Control-Allow-Origin: * + companion headers + OPTIONS
preflight from login.js and register.js
- These are first-party endpoints called from the same-origin SPA; the
"*" allowlist was a development convenience that shipped to prod
- verify.js is OUT OF SCOPE per architect's "cors-tighten" deferral
(see convoy plan § Architect's calls)
Other handler ordering preserved verbatim per brief: method gate first,
then rate-limit check (returns 429 with Retry-After header), then the
existing try/catch + body parsing + DB work.
Pre-merge requirements: KV_REST_API_URL + KV_REST_API_TOKEN must be set
in Vercel Production (already done — Upstash marketplace integration
auto-provisioned both, confirmed by maintainer 2026-05-23).
Convoy: fix-auth-bypass / Brief 4
Co-authored-by: Cursor <cursoragent@cursor.com>
69 lines
2.5 KiB
JavaScript
69 lines
2.5 KiB
JavaScript
import { Ratelimit } from '@upstash/ratelimit';
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import { Redis } from '@upstash/redis';
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// Lazy singleton. Module-load init would throw in environments without
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// Upstash env vars (local dev pre-onboarding, tests that transitively
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// import the auth handlers, Vercel build-time bundling). Defer construction
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// until the first request actually arrives.
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let cached = null;
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function init() {
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// Env-var names match Vercel's Upstash Marketplace integration, which
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// auto-provisions KV_REST_API_URL and KV_REST_API_TOKEN. See
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// https://upstash.com/docs/redis/howto/vercelintegration. Single-source-
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// of-truth — do NOT alias to UPSTASH_REDIS_REST_*.
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const url = process.env.KV_REST_API_URL;
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const token = process.env.KV_REST_API_TOKEN;
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if (url && token) {
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const redis = new Redis({ url, token });
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const ratelimit = new Ratelimit({
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redis,
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limiter: Ratelimit.slidingWindow(5, '15 m'),
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prefix: 'tcgvault:auth',
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});
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return { mode: 'live', ratelimit };
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}
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if (process.env.NODE_ENV === 'production') {
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// Fail-closed in production. A single failed login is a better outcome
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// than silently disabling brute-force protection on the live site.
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throw new Error(
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'[rate-limit] Upstash not configured. Set KV_REST_API_URL and KV_REST_API_TOKEN in the deployment environment (auto-provisioned by the Vercel Upstash Marketplace integration) before serving auth traffic.'
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);
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}
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console.warn(
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'[rate-limit] KV_REST_API_URL / KV_REST_API_TOKEN not set — rate limiting disabled (dev/test only)'
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);
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return { mode: 'noop' };
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}
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function extractIdentifier(req) {
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const xff = req.headers?.['x-forwarded-for'];
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const firstHop = Array.isArray(xff) ? xff[0] : xff?.split(',')[0]?.trim();
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return firstHop || req.socket?.remoteAddress || 'anonymous';
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}
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export async function checkAuthRateLimit(req) {
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if (!cached) {
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cached = init();
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}
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if (cached.mode === 'noop') {
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return { allowed: true, remaining: Infinity, reset: 0 };
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}
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const identifier = extractIdentifier(req);
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try {
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const { success, remaining, reset } = await cached.ratelimit.limit(identifier);
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return { allowed: success, remaining, reset };
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} catch (err) {
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// Fail-open on Upstash outage. A hard outage at the rate-limit backend
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// should not lock the entire user base out of login. Brute-force
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// protection lives behind defense-in-depth (Vercel firewall, etc.).
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console.error('[rate-limit]', err);
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return { allowed: true, remaining: Infinity, reset: 0 };
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}
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}
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