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https://github.com/bulwarkmail/webmail.git
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Linus Rath
32280b9cc1
The admin login limit keys on the client IP taken from X-Forwarded-For. With no reverse proxy in front, that header is whatever the client sends (Next only fills it from the socket when the request carries none), so each forged address got a fresh bucket of five guesses. Route handlers cannot see the socket address, so the limiter now also stops at 50 attempts per 15 minutes across all clients. `.env.example` says why a proxy that appends the header is still needed for trustworthy per-IP limits and audit addresses.
67 lines
2.0 KiB
TypeScript
67 lines
2.0 KiB
TypeScript
/**
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* In-memory rate limiter for admin login.
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* Max 5 attempts per IP per 15 minutes, and 50 across all clients.
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*/
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const MAX_ATTEMPTS = 5;
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const WINDOW_MS = 15 * 60 * 1000; // 15 minutes
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/**
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* Ceiling across all clients. The per-IP key comes from X-Forwarded-For
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* (getClientIP), which a client can write itself when the app is reachable
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* without a reverse proxy in front: Next fills the header from the socket
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* only when the request carries none. Rotating forged addresses would
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* otherwise buy unlimited guesses. 50 per window still leaves room for a
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* few admins mistyping at once.
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*/
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const GLOBAL_MAX_ATTEMPTS = 50;
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interface RateLimitEntry {
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count: number;
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resetAt: number;
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}
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const attempts = new Map<string, RateLimitEntry>();
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let globalAttempts: RateLimitEntry | null = null;
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// Clean up expired entries periodically
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setInterval(() => {
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const now = Date.now();
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for (const [key, entry] of attempts) {
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if (entry.resetAt <= now) {
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attempts.delete(key);
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}
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}
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}, 60_000).unref();
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/**
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* Check if the IP is rate limited. Returns remaining attempts, or 0 if blocked.
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*/
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export function checkRateLimit(ip: string): { allowed: boolean; remaining: number; retryAfterMs: number } {
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const now = Date.now();
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if (!globalAttempts || globalAttempts.resetAt <= now) {
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globalAttempts = { count: 0, resetAt: now + WINDOW_MS };
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}
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if (globalAttempts.count >= GLOBAL_MAX_ATTEMPTS) {
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return { allowed: false, remaining: 0, retryAfterMs: globalAttempts.resetAt - now };
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}
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const entry = attempts.get(ip);
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if (!entry || entry.resetAt <= now) {
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// New window
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attempts.set(ip, { count: 1, resetAt: now + WINDOW_MS });
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globalAttempts.count++;
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return { allowed: true, remaining: MAX_ATTEMPTS - 1, retryAfterMs: 0 };
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}
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if (entry.count >= MAX_ATTEMPTS) {
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return { allowed: false, remaining: 0, retryAfterMs: entry.resetAt - now };
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}
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entry.count++;
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globalAttempts.count++;
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return { allowed: true, remaining: MAX_ATTEMPTS - entry.count, retryAfterMs: 0 };
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}
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