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proxy-server.js
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233
proxy-server.js
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#!/usr/bin/env node
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/**
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* PSK Proxy Out-Node (Server)
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*
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* Listens for a single TLS-PSK tunnel connection from the proxy client.
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* Receives OPEN(host,port) to create outbound TCP connections to remote servers,
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* then forwards DATA/CLOSE frames bidirectionally.
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*
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* Protocol (over a single TLS socket):
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* Header: [1 byte type][4 bytes connection id][4 bytes data length][data...]
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*
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* Message Types:
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* DATA (2): Carry stream data
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* CLOSE (3): Close a stream
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* OPEN (4): Open stream to host:port, payload = [2B hostLen][host][2B port]
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* OPEN_RESULT (5): Result for OPEN, payload = [1B status] (1 = success, 0 = failure)
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*/
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const net = require('net');
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const tls = require('tls');
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const fs = require('fs');
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const { program } = require('commander');
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program
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.requiredOption('--tunnel-port <port>', 'Port for proxy client TLS-PSK tunnel connections')
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.requiredOption('--host <host>', 'Host to bind to (e.g., 0.0.0.0)')
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.requiredOption('--psk-file <path>', 'Path to PSK key file')
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.option('--connect-timeout <ms>', 'Timeout for outbound TCP connect (ms)', '10000')
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.parse();
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const options = program.opts();
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let pskKey;
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try {
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pskKey = fs.readFileSync(options.pskFile, 'utf8').trim();
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} catch (error) {
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console.error(`Error reading PSK file: ${error.message}`);
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process.exit(1);
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}
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const OUT_CONNECT_TIMEOUT = parseInt(options.connectTimeout, 10) || 10000;
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// Message Types
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const MSG_TYPES = {
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DATA: 2,
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CLOSE: 3,
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OPEN: 4,
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OPEN_RESULT: 5,
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};
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function writeMessage(socket, type, connectionId, data = Buffer.alloc(0)) {
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if (!socket || socket.destroyed) return;
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const header = Buffer.allocUnsafe(9);
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header.writeUInt8(type, 0);
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header.writeUInt32BE(connectionId >>> 0, 1);
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header.writeUInt32BE(data.length >>> 0, 5);
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socket.write(header);
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if (data.length > 0) socket.write(data);
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}
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function createMessageReader() {
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let buffer = Buffer.alloc(0);
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let expectedLength = 9;
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let currentMessage = null;
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return function onData(data, callback) {
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buffer = Buffer.concat([buffer, data]);
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// Parse as many complete frames as possible
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while (buffer.length >= expectedLength) {
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if (!currentMessage) {
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const type = buffer.readUInt8(0);
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const connectionId = buffer.readUInt32BE(1);
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const dataLength = buffer.readUInt32BE(5);
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currentMessage = { type, connectionId, dataLength };
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expectedLength = 9 + dataLength;
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if (dataLength === 0) {
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callback(currentMessage.type, currentMessage.connectionId, Buffer.alloc(0));
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buffer = buffer.subarray(9);
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currentMessage = null;
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expectedLength = 9;
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}
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} else {
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const messageData = buffer.subarray(9, expectedLength);
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callback(currentMessage.type, currentMessage.connectionId, messageData);
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buffer = buffer.subarray(expectedLength);
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currentMessage = null;
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expectedLength = 9;
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}
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}
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};
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}
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function parseOpenPayload(buf) {
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if (buf.length < 4) return null;
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let offset = 0;
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const hostLen = buf.readUInt16BE(offset); offset += 2;
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if (buf.length < 2 + hostLen + 2) return null;
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const host = buf.subarray(offset, offset + hostLen).toString('utf8'); offset += hostLen;
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const port = buf.readUInt16BE(offset); offset += 2;
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return { host, port };
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}
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function buildOpenResultPayload(success) {
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const b = Buffer.allocUnsafe(1);
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b.writeUInt8(success ? 1 : 0, 0);
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return b;
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}
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function pskCallback(socket, identity) {
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console.log(`Tunnel client identity: ${identity}`);
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return Buffer.from(pskKey, 'hex');
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}
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let tunnelSocket = null;
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const upstreamConns = new Map(); // connectionId -> net.Socket
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function closeAllUpstreams() {
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for (const [id, s] of upstreamConns) {
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try { s.destroy(); } catch (_) {}
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}
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upstreamConns.clear();
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}
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const server = tls.createServer({
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pskCallback,
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ciphers: 'PSK-AES256-GCM-SHA384:PSK-AES128-GCM-SHA256',
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}, (socket) => {
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console.log('Proxy tunnel client connected');
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tunnelSocket = socket;
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socket.setNoDelay(true);
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socket.setKeepAlive(true, 30000);
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const reader = createMessageReader();
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socket.on('data', (data) => {
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reader(data, (type, connectionId, payload) => {
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if (type === MSG_TYPES.OPEN) {
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const spec = parseOpenPayload(payload);
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if (!spec) {
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console.warn(`Invalid OPEN payload for connection ${connectionId}`);
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writeMessage(tunnelSocket, MSG_TYPES.OPEN_RESULT, connectionId, buildOpenResultPayload(false));
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return;
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}
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const { host, port } = spec;
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// Create outbound TCP connection
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const upstream = net.createConnection({ host, port });
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upstream.setNoDelay(true);
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upstream.setKeepAlive(true, 30000);
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let connected = false;
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const connectTimer = setTimeout(() => {
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if (!connected) {
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upstream.destroy(new Error('Connect timeout'));
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}
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}, OUT_CONNECT_TIMEOUT);
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upstream.once('connect', () => {
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connected = true;
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clearTimeout(connectTimer);
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upstreamConns.set(connectionId, upstream);
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// Notify open success
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writeMessage(tunnelSocket, MSG_TYPES.OPEN_RESULT, connectionId, buildOpenResultPayload(true));
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});
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upstream.on('data', (chunk) => {
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writeMessage(tunnelSocket, MSG_TYPES.DATA, connectionId, chunk);
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});
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const cleanup = () => {
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clearTimeout(connectTimer);
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if (upstreamConns.get(connectionId) === upstream) {
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upstreamConns.delete(connectionId);
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}
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writeMessage(tunnelSocket, MSG_TYPES.CLOSE, connectionId);
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};
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upstream.on('error', (err) => {
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if (!connected) {
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clearTimeout(connectTimer);
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writeMessage(tunnelSocket, MSG_TYPES.OPEN_RESULT, connectionId, buildOpenResultPayload(false));
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} else {
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// Upstream error after established
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cleanup();
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}
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});
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upstream.on('close', () => {
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cleanup();
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});
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} else if (type === MSG_TYPES.DATA) {
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const upstream = upstreamConns.get(connectionId);
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if (upstream && !upstream.destroyed) {
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upstream.write(payload);
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}
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} else if (type === MSG_TYPES.CLOSE) {
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const upstream = upstreamConns.get(connectionId);
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if (upstream) {
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upstream.destroy();
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upstreamConns.delete(connectionId);
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}
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} else {
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// ignore unknown types
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}
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});
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});
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socket.on('close', () => {
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console.log('Proxy tunnel disconnected');
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tunnelSocket = null;
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closeAllUpstreams();
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});
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socket.on('error', (err) => {
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console.error('Tunnel socket error:', err.message);
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});
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});
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server.listen(parseInt(options.tunnelPort, 10), options.host, () => {
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console.log(`PSK Proxy Out-Node listening on ${options.host}:${options.tunnelPort}`);
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});
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process.on('SIGINT', () => {
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console.log('Shutting down...');
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try { server.close(); } catch (_) {}
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closeAllUpstreams();
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process.exit(0);
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});
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