231 lines
13 KiB
JavaScript
231 lines
13 KiB
JavaScript
/**
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* @description Meshcentral web relay server
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* @author Ylian Saint-Hilaire
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* @copyright Intel Corporation 2018-2022
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* @license Apache-2.0
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* @version v0.0.1
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*/
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/*jslint node: true */
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/*jshint node: true */
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/*jshint strict:false */
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/*jshint -W097 */
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/*jshint esversion: 6 */
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"use strict";
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// Construct a HTTP redirection web server object
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module.exports.CreateWebRelayServer = function (parent, db, args, certificates, func) {
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var obj = {};
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obj.parent = parent;
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obj.db = db;
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obj.express = require('express');
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obj.session = require('cookie-session');
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obj.expressWs = null;
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obj.tlsServer = null;
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obj.net = require('net');
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obj.app = obj.express();
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obj.webRelayServer = null;
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obj.port = 0;
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var nextMultiTunnelId = 1;
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var relayMultiTunnels = {} // RelayID --> Web Mutli-Tunnel
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const constants = (require('crypto').constants ? require('crypto').constants : require('constants')); // require('constants') is deprecated in Node 11.10, use require('crypto').constants instead.
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var tlsSessionStore = {}; // Store TLS session information for quick resume.
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var tlsSessionStoreCount = 0; // Number of cached TLS session information in store.
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function serverStart() {
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if (args.trustedproxy) {
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// Reverse proxy should add the "X-Forwarded-*" headers
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try {
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obj.app.set('trust proxy', args.trustedproxy);
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} catch (ex) {
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// If there is an error, try to resolve the string
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if ((args.trustedproxy.length == 1) && (typeof args.trustedproxy[0] == 'string')) {
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require('dns').lookup(args.trustedproxy[0], function (err, address, family) { if (err == null) { obj.app.set('trust proxy', address); args.trustedproxy = [address]; } });
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}
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}
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}
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else if (typeof args.tlsoffload == 'object') {
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// Reverse proxy should add the "X-Forwarded-*" headers
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try {
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obj.app.set('trust proxy', args.tlsoffload);
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} catch (ex) {
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// If there is an error, try to resolve the string
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if ((Array.isArray(args.tlsoffload)) && (args.tlsoffload.length == 1) && (typeof args.tlsoffload[0] == 'string')) {
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require('dns').lookup(args.tlsoffload[0], function (err, address, family) { if (err == null) { obj.app.set('trust proxy', address); args.tlsoffload = [address]; } });
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}
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}
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}
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// Setup cookie session
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var sessionOptions = {
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name: 'xid', // Recommended security practice to not use the default cookie name
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httpOnly: true,
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keys: [args.sessionkey], // If multiple instances of this server are behind a load-balancer, this secret must be the same for all instances
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secure: (args.tlsoffload == null), // Use this cookie only over TLS (Check this: https://expressjs.com/en/guide/behind-proxies.html)
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sameSite: args.sessionsamesite
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}
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if (args.sessiontime != null) { sessionOptions.maxAge = (args.sessiontime * 60 * 1000); }
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obj.app.use(obj.session(sessionOptions));
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// Add HTTP security headers to all responses
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obj.app.use(function (req, res, next) {
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parent.debug('webrequest', req.url + ' (RelayServer)');
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res.removeHeader('X-Powered-By');
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res.set({
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'strict-transport-security': 'max-age=60000; includeSubDomains',
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'Referrer-Policy': 'no-referrer',
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'x-frame-options': 'SAMEORIGIN',
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'X-XSS-Protection': '1; mode=block',
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'X-Content-Type-Options': 'nosniff',
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'Content-Security-Policy': "default-src 'none'; style-src 'self' 'unsafe-inline';"
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});
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// Set the real IP address of the request
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// If a trusted reverse-proxy is sending us the remote IP address, use it.
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var ipex = '0.0.0.0', xforwardedhost = req.headers.host;
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if (typeof req.connection.remoteAddress == 'string') { ipex = (req.connection.remoteAddress.startsWith('::ffff:')) ? req.connection.remoteAddress.substring(7) : req.connection.remoteAddress; }
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if (
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(args.trustedproxy === true) || (args.tlsoffload === true) ||
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((typeof args.trustedproxy == 'object') && (isIPMatch(ipex, args.trustedproxy))) ||
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((typeof args.tlsoffload == 'object') && (isIPMatch(ipex, args.tlsoffload)))
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) {
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// Get client IP
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if (req.headers['cf-connecting-ip']) { // Use CloudFlare IP address if present
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req.clientIp = req.headers['cf-connecting-ip'].split(',')[0].trim();
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} else if (req.headers['x-forwarded-for']) {
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req.clientIp = req.headers['x-forwarded-for'].split(',')[0].trim();
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} else if (req.headers['x-real-ip']) {
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req.clientIp = req.headers['x-real-ip'].split(',')[0].trim();
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} else {
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req.clientIp = ipex;
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}
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// If there is a port number, remove it. This will only work for IPv4, but nice for people that have a bad reverse proxy config.
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const clientIpSplit = req.clientIp.split(':');
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if (clientIpSplit.length == 2) { req.clientIp = clientIpSplit[0]; }
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// Get server host
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if (req.headers['x-forwarded-host']) { xforwardedhost = req.headers['x-forwarded-host'].split(',')[0]; } // If multiple hosts are specified with a comma, take the first one.
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} else {
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req.clientIp = ipex;
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}
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// Check if this there is a multi-tunnel for this request
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if (req.url.startsWith('/control-redirect.ashx?n=')) {
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return next();
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} else {
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if ((req.session.userid != null) && (req.session.rid != null)) {
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var relayMultiTunnel = relayMultiTunnels[req.session.userid + '/' + req.session.rid];
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if (relayMultiTunnel != null) {
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// The multi-tunnel session is valid, use it
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relayMultiTunnel.handleRequest(req, res);
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} else {
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// No multi-tunnel session with this relay identifier, close the HTTP request.
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res.end();
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}
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} else {
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// The user is not logged in or does not have a relay identifier, close the HTTP request.
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res.end();
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}
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}
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});
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// This is the magic URL that will setup the relay session
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obj.app.get('/control-redirect.ashx', function (req, res) {
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if ((req.session == null) || (req.session.userid == null)) { res.redirect('/'); return; }
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res.set({ 'Cache-Control': 'no-store' });
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parent.debug('web', 'webRelaySetup');
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// Check that all the required arguments are present
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if ((req.session.userid == null) || (req.query.n == null) || (req.query.p == null) || ((req.query.appid != 1) && (req.query.appid != 2))) { res.redirect('/'); return; }
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// Get the user and domain information
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const userid = req.session.userid;
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const domainid = userid.split('/')[1];
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const domain = parent.config.domains[domainid];
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const nodeid = ((req.query.relayid != null) ? req.query.relayid : req.query.n);
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const addr = (req.query.addr != null) ? req.query.addr : '127.0.0.1';
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const port = parseInt(req.query.p);
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// Check to see if we already have a multi-relay session that matches exactly this device and port for this user
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var relayMultiTunnel = null;
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for (var i in relayMultiTunnels) {
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const xrelayMultiTunnel = relayMultiTunnels[i];
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if ((xrelayMultiTunnel.domain.id == domain.id) && (xrelayMultiTunnel.userid == userid) && (xrelayMultiTunnel.nodeid == nodeid) && (xrelayMultiTunnel.addr == addr) && (xrelayMultiTunnel.port == port)) {
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relayMultiTunnel = xrelayMultiTunnel; // We found an exact match
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}
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}
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if (relayMultiTunnel != null) {
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// Since we found a match, use it
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req.session.rid = relayMultiTunnel.multiTunnelId;
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} else {
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// Create the multi-tunnel
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relayMultiTunnel = require('./apprelays.js').CreateMultiWebRelay(parent, db, req, args, domain, userid, nodeid, addr, port);
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relayMultiTunnel.onclose = function (multiTunnelId) { delete obj.relayTunnels[multiTunnelId]; }
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relayMultiTunnel.multiTunnelId = nextMultiTunnelId++;
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// Set the tunnel
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relayMultiTunnels[userid + '/' + relayMultiTunnel.multiTunnelId] = relayMultiTunnel;
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req.session.rid = relayMultiTunnel.multiTunnelId;
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}
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// Redirect to root
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res.redirect('/');
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});
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// Start the server, only after users and meshes are loaded from the database.
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if (args.tlsoffload) {
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// Setup the HTTP server without TLS
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obj.expressWs = require('express-ws')(obj.app, null, { wsOptions: { perMessageDeflate: (args.wscompression === true) } });
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} else {
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// Setup the HTTP server with TLS, use only TLS 1.2 and higher with perfect forward secrecy (PFS).
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const tlsOptions = { cert: certificates.web.cert, key: certificates.web.key, ca: certificates.web.ca, rejectUnauthorized: true, ciphers: "HIGH:TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256:TLS_AES_128_CCM_8_SHA256:TLS_AES_128_CCM_SHA256:TLS_CHACHA20_POLY1305_SHA256", secureOptions: constants.SSL_OP_NO_SSLv2 | constants.SSL_OP_NO_SSLv3 | constants.SSL_OP_NO_COMPRESSION | constants.SSL_OP_CIPHER_SERVER_PREFERENCE | constants.SSL_OP_NO_TLSv1 | constants.SSL_OP_NO_TLSv1_1 };
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obj.tlsServer = require('https').createServer(tlsOptions, obj.app);
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obj.tlsServer.on('secureConnection', function () { /*console.log('tlsServer secureConnection');*/ });
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obj.tlsServer.on('error', function (err) { console.log('tlsServer error', err); });
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obj.tlsServer.on('newSession', function (id, data, cb) { if (tlsSessionStoreCount > 1000) { tlsSessionStoreCount = 0; tlsSessionStore = {}; } tlsSessionStore[id.toString('hex')] = data; tlsSessionStoreCount++; cb(); });
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obj.tlsServer.on('resumeSession', function (id, cb) { cb(null, tlsSessionStore[id.toString('hex')] || null); });
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obj.expressWs = require('express-ws')(obj.app, obj.tlsServer, { wsOptions: { perMessageDeflate: (args.wscompression === true) } });
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}
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}
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// Find a free port starting with the specified one and going up.
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function CheckListenPort(port, addr, func) {
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var s = obj.net.createServer(function (socket) { });
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obj.webRelayServer = s.listen(port, addr, function () { s.close(function () { if (func) { func(port, addr); } }); }).on("error", function (err) {
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if (args.exactports) { console.error("ERROR: MeshCentral HTTP relay server port " + port + " not available."); process.exit(); }
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else { if (port < 65535) { CheckListenPort(port + 1, addr, func); } else { if (func) { func(0); } } }
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});
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}
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// Start the ExpressJS web server, if the port is busy try the next one.
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function StartWebRelayServer(port, addr) {
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if (port == 0 || port == 65535) { return; }
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if (obj.tlsServer != null) {
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if (args.lanonly == true) {
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obj.tcpServer = obj.tlsServer.listen(port, addr, function () { console.log('MeshCentral HTTPS relay server running on port ' + port + ((args.aliasport != null) ? (', alias port ' + args.aliasport) : '') + '.'); });
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} else {
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obj.tcpServer = obj.tlsServer.listen(port, addr, function () { console.log('MeshCentral HTTPS relay server running on ' + certificates.CommonName + ':' + port + ((args.aliasport != null) ? (', alias port ' + args.aliasport) : '') + '.'); });
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obj.parent.updateServerState('servername', certificates.CommonName);
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}
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if (obj.parent.authlog) { obj.parent.authLog('https', 'Web relay server listening on ' + ((addr != null) ? addr : '0.0.0.0') + ' port ' + port + '.'); }
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obj.parent.updateServerState('https-relay-port', port);
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if (args.aliasport != null) { obj.parent.updateServerState('https-relay-aliasport', args.aliasport); }
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} else {
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obj.tcpServer = obj.app.listen(port, addr, function () { console.log('MeshCentral HTTP relay server running on port ' + port + ((args.aliasport != null) ? (', alias port ' + args.aliasport) : '') + '.'); });
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obj.parent.updateServerState('http-relay-port', port);
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if (args.aliasport != null) { obj.parent.updateServerState('http-relay-aliasport', args.aliasport); }
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}
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obj.port = port;
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}
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function getRandomPassword() { return Buffer.from(require('crypto').randomBytes(9), 'binary').toString('base64').split('/').join('@'); }
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// Start up the web relay server
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serverStart();
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CheckListenPort(args.relayport, args.relayportbind, StartWebRelayServer);
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return obj;
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};
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