mirror of
https://github.com/Ylianst/MeshCentral.git
synced 2024-11-23 06:34:54 +03:00
346 lines
20 KiB
JavaScript
346 lines
20 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.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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if (args.compression !== false) { obj.app.use(require('compression')()); }
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obj.app.disable('x-powered-by');
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obj.webRelayServer = null;
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obj.port = 0;
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obj.cleanupTimer = null;
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var relaySessions = {} // 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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// Setup CrowdSec bouncer middleware if needed
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if (parent.crowdsecMiddleware != null) { obj.app.use(parent.crowdsecMiddleware); }
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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 a keygrip instance with higher default security, default hash is SHA1, we want to bump that up with SHA384
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// If multiple instances of this server are behind a load-balancer, this secret must be the same for all instances
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// If args.sessionkey is a string, use it as a single key, but args.sessionkey can also be used as an array of keys.
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const keygrip = require('keygrip')((typeof args.sessionkey == 'string') ? [args.sessionkey] : args.sessionkey, 'sha384', 'base64');
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// Watch for device share removal
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parent.AddEventDispatch(['server-shareremove'], obj);
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obj.HandleEvent = function (source, event, ids, id) {
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if (event.action == 'removedDeviceShare') {
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for (var relaySessionId in relaySessions) {
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// A share was removed that matches an active session, close the session.
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if (relaySessions[relaySessionId].xpublicid === event.publicid) { relaySessions[relaySessionId].close(); }
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}
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}
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}
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// Setup cookie session
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const 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: keygrip,
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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 ? args.sessionsamesite : 'lax')
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}
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if (args.sessiontime != null) { sessionOptions.maxAge = (args.sessiontime * 60000); } // sessiontime is minutes
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obj.app.use(require('cookie-session')(sessionOptions));
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obj.app.use(function(request, response, next) { // Patch for passport 0.6.0 - https://github.com/jaredhanson/passport/issues/904
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if (request.session && !request.session.regenerate) {
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request.session.regenerate = function (cb) {
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cb()
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}
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}
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if (request.session && !request.session.save) {
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request.session.save = function (cb) {
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cb()
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}
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}
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next()
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});
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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('webrelay', req.url);
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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 'self'; 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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// If this is a session start or a websocket, have the application handle this
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if ((req.headers.upgrade == 'websocket') || (req.url.startsWith('/control-redirect.ashx?n='))) {
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return next();
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} else {
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// If this is a normal request (GET, POST, etc) handle it here
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var webSessionId = null;
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if ((req.session.userid != null) && (req.session.x != null)) { webSessionId = req.session.userid + '/' + req.session.x; }
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else if (req.session.z != null) { webSessionId = req.session.z; }
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if ((webSessionId != null) && (parent.webserver.destroyedSessions[webSessionId] == null)) {
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var relaySession = relaySessions[webSessionId];
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if (relaySession != null) {
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// The web relay session is valid, use it
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relaySession.handleRequest(req, res);
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} else {
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// No web relay ession 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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// 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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// Handle incoming web socket calls
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obj.app.ws('/*', function (ws, req) {
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var webSessionId = null;
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if ((req.session.userid != null) && (req.session.x != null)) { webSessionId = req.session.userid + '/' + req.session.x; }
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else if (req.session.z != null) { webSessionId = req.session.z; }
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if ((webSessionId != null) && (parent.webserver.destroyedSessions[webSessionId] == null)) {
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var relaySession = relaySessions[webSessionId];
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if (relaySession != null) {
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// The multi-tunnel session is valid, use it
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relaySession.handleWebSocket(ws, req);
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} else {
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// No multi-tunnel session with this relay identifier, close the websocket.
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ws.close();
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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 websocket.
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ws.close();
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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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res.set({ 'Cache-Control': 'no-store' });
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parent.debug('webrelay', 'webRelaySetup');
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// Decode the relay cookie
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if (req.query.c == null) { res.sendStatus(404); return; }
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// Decode and check if this relay cookie is valid
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var userid, domainid, domain, nodeid, addr, port, appid, webSessionId, expire, publicid;
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const urlCookie = obj.parent.decodeCookie(req.query.c, parent.loginCookieEncryptionKey, 32); // Allow cookies up to 32 minutes old. The web page will renew this cookie every 30 minutes.
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if (urlCookie == null) { res.sendStatus(404); return; }
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// Decode the incoming cookie
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if ((urlCookie.ruserid != null) && (urlCookie.x != null)) {
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if (parent.webserver.destroyedSessions[urlCookie.ruserid + '/' + urlCookie.x] != null) { res.sendStatus(404); return; }
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// This is a standard user, figure out what our web relay will be.
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if (req.session.x != urlCookie.x) { req.session.x = urlCookie.x; } // Set the sessionid if missing
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if (req.session.userid != urlCookie.ruserid) { req.session.userid = urlCookie.ruserid; } // Set the session userid if missing
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if (req.session.z) { delete req.session.z; } // Clear the web relay guest session
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userid = req.session.userid;
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domainid = userid.split('/')[1];
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domain = parent.config.domains[domainid];
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nodeid = ((req.query.relayid != null) ? req.query.relayid : req.query.n);
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addr = (req.query.addr != null) ? req.query.addr : '127.0.0.1';
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port = parseInt(req.query.p);
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appid = parseInt(req.query.appid);
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webSessionId = req.session.userid + '/' + req.session.x;
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// Check that all the required arguments are present
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if ((req.session.userid == null) || (req.session.x == null) || (req.query.n == null) || (req.query.p == null) || (parent.webserver.destroyedSessions[webSessionId] != null) || ((req.query.appid != 1) && (req.query.appid != 2))) { res.redirect('/'); return; }
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} else if (urlCookie.r == 8) {
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// This is a guest user, figure out what our web relay will be.
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userid = urlCookie.userid;
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domainid = userid.split('/')[1];
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domain = parent.config.domains[domainid];
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nodeid = urlCookie.nid;
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addr = (urlCookie.addr != null) ? urlCookie.addr : '127.0.0.1';
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port = urlCookie.port;
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appid = (urlCookie.p == 16) ? 2 : 1; // appid: 1 = HTTP, 2 = HTTPS
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webSessionId = userid + '/' + urlCookie.pid;
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publicid = urlCookie.pid;
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if (req.session.x) { delete req.session.x; } // Clear the web relay sessionid
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if (req.session.userid) { delete req.session.userid; } // Clear the web relay userid
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if (req.session.z != webSessionId) { req.session.z = webSessionId; } // Set the web relay guest session
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expire = urlCookie.expire;
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if ((expire != null) && (expire <= Date.now())) { parent.debug('webrelay', 'expired link'); res.sendStatus(404); return; }
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}
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// No session identifier was setup, exit now
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if (webSessionId == null) { res.sendStatus(404); return; }
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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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const xrelaySession = relaySessions[webSessionId];
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if ((xrelaySession != null) && (xrelaySession.domain.id == domain.id) && (xrelaySession.userid == userid) && (xrelaySession.nodeid == nodeid) && (xrelaySession.addr == addr) && (xrelaySession.port == port) && (xrelaySession.appid == appid)) {
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// We found an exact match, we are all setup already, redirect to root
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res.redirect('/');
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return;
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}
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// Check that the user has rights to access this device
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parent.webserver.GetNodeWithRights(domain, userid, nodeid, function (node, rights, visible) {
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// If there is no remote control or relay rights, reject this web relay
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if ((rights & 0x00200008) == 0) { res.sendStatus(404); return; } // MESHRIGHT_REMOTECONTROL or MESHRIGHT_RELAY
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// There is a relay session, but it's not correct, close it.
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if (xrelaySession != null) { xrelaySession.close(); delete relaySessions[webSessionId]; }
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// Create a web relay session
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const relaySession = require('./apprelays.js').CreateWebRelaySession(obj, db, req, args, domain, userid, nodeid, addr, port, appid, webSessionId, expire, node.mtype);
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relaySession.xpublicid = publicid;
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relaySession.onclose = function (sessionId) {
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// Remove the relay session
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delete relaySessions[sessionId];
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// If there are not more relay sessions, clear the cleanup timer
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if ((Object.keys(relaySessions).length == 0) && (obj.cleanupTimer != null)) { clearInterval(obj.cleanupTimer); obj.cleanupTimer = null; }
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}
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// Set the multi-tunnel session
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relaySessions[webSessionId] = relaySession;
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// Setup the cleanup timer if needed
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if (obj.cleanupTimer == null) { obj.cleanupTimer = setInterval(checkTimeout, 10000); }
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// Redirect to root
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res.redirect('/');
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});
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});
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}
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// Check that everything is cleaned up
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function checkTimeout() {
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for (var i in relaySessions) { relaySessions[i].checkTimeout(); }
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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 + ((typeof args.relayaliasport == 'number') ? (', alias port ' + args.relayaliasport) : '') + '.'); });
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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 + ((typeof args.relayaliasport == 'number') ? (', alias port ' + args.relayaliasport) : '') + '.'); });
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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 (typeof args.relayaliasport == 'number') { obj.parent.updateServerState('https-relay-aliasport', args.relayaliasport); }
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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 + ((typeof args.relayaliasport == 'number') ? (', alias port ' + args.relayaliasport) : '') + '.'); });
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obj.parent.updateServerState('http-relay-port', port);
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if (typeof args.relayaliasport == 'number') { obj.parent.updateServerState('http-relay-aliasport', args.relayaliasport); }
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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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// Perform a IP match against a list
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function isIPMatch(ip, matchList) {
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const ipcheck = require('ipcheck');
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for (var i in matchList) { if (ipcheck.match(ip, matchList[i]) == true) return true; }
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return false;
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}
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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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