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relay: stricter rate limits

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Alex Gleason 2025-01-25 15:21:16 -06:00
parent 68a0ef6648
commit 43a47770f4
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1 changed files with 46 additions and 16 deletions
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62
src/controllers/nostr/relay.ts
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@ -1,6 +1,6 @@
import { Stickynotes } from '@soapbox/stickynotes';
import TTLCache from '@isaacs/ttlcache';
import {
NKinds,
NostrClientCLOSE,
NostrClientCOUNT,
NostrClientEVENT,
@ -19,14 +19,27 @@ import { RelayError } from '@/RelayError.ts';
import { Storages } from '@/storages.ts';
import { Time } from '@/utils/time.ts';
import { purifyEvent } from '@/utils/purify.ts';
import { MemoryRateLimiter } from '@/utils/ratelimiter/MemoryRateLimiter.ts';
import { MultiRateLimiter } from '@/utils/ratelimiter/MultiRateLimiter.ts';
import { RateLimiter } from '@/utils/ratelimiter/types.ts';
/** Limit of initial events returned for a subscription. */
const FILTER_LIMIT = 100;
const LIMITER_WINDOW = Time.minutes(1);
const LIMITER_LIMIT = 300;
const limiter = new TTLCache<string, number>();
const limiters = {
msg: new MemoryRateLimiter({ limit: 300, window: Time.minutes(1) }),
req: new MultiRateLimiter([
new MemoryRateLimiter({ limit: 15, window: Time.seconds(5) }),
new MemoryRateLimiter({ limit: 300, window: Time.minutes(5) }),
new MemoryRateLimiter({ limit: 1000, window: Time.hours(1) }),
]),
event: new MultiRateLimiter([
new MemoryRateLimiter({ limit: 10, window: Time.seconds(10) }),
new MemoryRateLimiter({ limit: 100, window: Time.hours(1) }),
new MemoryRateLimiter({ limit: 500, window: Time.days(1) }),
]),
ephemeral: new MemoryRateLimiter({ limit: 30, window: Time.seconds(10) }),
};
/** Connections for metrics purposes. */
const connections = new Set<WebSocket>();
@ -43,15 +56,7 @@ function connectStream(socket: WebSocket, ip: string | undefined) {
};
socket.onmessage = (e) => {
if (ip) {
const count = limiter.get(ip) ?? 0;
limiter.set(ip, count + 1, { ttl: LIMITER_WINDOW });
if (count > LIMITER_LIMIT) {
socket.close(1008, 'Rate limit exceeded');
return;
}
}
assertRateLimit(limiters.msg);
if (typeof e.data !== 'string') {
socket.close(1003, 'Invalid message');
@ -77,6 +82,18 @@ function connectStream(socket: WebSocket, ip: string | undefined) {
}
};
function assertRateLimit(limiter: Pick<RateLimiter, 'client'>): void {
if (ip) {
const client = limiter.client(ip);
try {
client.hit();
} catch (error) {
socket.close(1008, 'Rate limit exceeded');
throw error;
}
}
}
/** Handle client message. */
function handleMsg(msg: NostrClientMsg) {
switch (msg[0]) {
@ -97,6 +114,8 @@ function connectStream(socket: WebSocket, ip: string | undefined) {
/** Handle REQ. Start a subscription. */
async function handleReq([_, subId, ...filters]: NostrClientREQ): Promise<void> {
assertRateLimit(limiters.req);
const controller = new AbortController();
controllers.get(subId)?.abort();
controllers.set(subId, controller);
@ -136,6 +155,13 @@ function connectStream(socket: WebSocket, ip: string | undefined) {
/** Handle EVENT. Store the event. */
async function handleEvent([_, event]: NostrClientEVENT): Promise<void> {
relayEventsCounter.inc({ kind: event.kind.toString() });
if (NKinds.ephemeral(event.kind)) {
assertRateLimit(limiters.ephemeral);
} else {
assertRateLimit(limiters.event);
}
try {
// This will store it (if eligible) and run other side-effects.
await pipeline.handleEvent(purifyEvent(event), { source: 'relay', signal: AbortSignal.timeout(1000) });
@ -161,6 +187,7 @@ function connectStream(socket: WebSocket, ip: string | undefined) {
/** Handle COUNT. Return the number of events matching the filters. */
async function handleCount([_, subId, ...filters]: NostrClientCOUNT): Promise<void> {
assertRateLimit(limiters.req);
const store = await Storages.db();
const { count } = await store.count(filters, { timeout: Conf.db.timeouts.relay });
send(['COUNT', subId, { count, approximate: false }]);
@ -188,8 +215,11 @@ const relayController: AppController = (c, next) => {
const ip = c.req.header('x-real-ip');
if (ip) {
const count = limiter.get(ip) ?? 0;
if (count > LIMITER_LIMIT) {
const remaining = Object
.values(limiters)
.reduce((acc, limiter) => Math.min(acc, limiter.client(ip).remaining), Infinity);
if (remaining < 0) {
return c.json({ error: 'Rate limit exceeded' }, 429);
}
}