/** * @description Meshcentral web server * @author Ylian Saint-Hilaire * @copyright Intel Corporation 2018-2022 * @license Apache-2.0 * @version v0.0.2 */ /*jslint node: true */ /*jshint node: true */ /*jshint strict:false */ /*jshint -W097 */ /*jshint esversion: 6 */ "use strict"; // ExpressJS login sample // https://github.com/expressjs/express/blob/master/examples/auth/index.js // Construct a HTTP redirection web server object module.exports.CreateRedirServer = function (parent, db, args, func) { var obj = {}; obj.parent = parent; obj.db = db; obj.args = args; obj.certificates = null; obj.express = require('express'); obj.net = require('net'); obj.app = obj.express(); obj.tcpServer = null; obj.port = null; const leChallengePrefix = '/.well-known/acme-challenge/'; // Perform an HTTP to HTTPS redirection function performRedirection(req, res) { var host = req.headers.host; if (typeof host == 'string') { host = host.split(':')[0]; } if ((host == null) && (obj.certificates != null)) { host = obj.certificates.CommonName; if (obj.certificates.CommonName.indexOf('.') == -1) { host = req.headers.host; } } var httpsPort = ((obj.args.aliasport == null) ? obj.args.port : obj.args.aliasport); // Use HTTPS alias port is specified res.redirect('https://' + host + ':' + httpsPort + req.url); } /* // Return the current domain of the request function getDomain(req) { var x = req.url.split("/"); if (x.length < 2) { return parent.config.domains[""]; } if (parent.config.domains[x[1].toLowerCase()]) { return parent.config.domains[x[1].toLowerCase()]; } return parent.config.domains[""]; } */ // Renter the terms of service. obj.app.get('/MeshServerRootCert.cer', function (req, res) { // The redirection server starts before certificates are loaded, make sure to handle the case where no certificate is loaded now. if (obj.certificates != null) { res.set({ 'Cache-Control': 'no-store', 'Content-Type': 'application/octet-stream', 'Content-Disposition': 'attachment; filename*="' + encodeURIComponent(obj.certificates.RootName) + '.cer"' }); var rootcert = obj.certificates.root.cert; var i = rootcert.indexOf('-----BEGIN CERTIFICATE-----\r\n'); if (i >= 0) { rootcert = rootcert.substring(i + 29); } i = rootcert.indexOf('-----END CERTIFICATE-----'); if (i >= 0) { rootcert = rootcert.substring(i, 0); } res.send(Buffer.from(rootcert, 'base64')); } else { res.sendStatus(404); } }); // Add HTTP security headers to all responses obj.app.use(function (req, res, next) { parent.debug('webrequest', req.url + ' (RedirServer)'); res.removeHeader('X-Powered-By'); if ((parent.letsencrypt != null) && (req.url.startsWith(leChallengePrefix))) { // Let's Encrypt Support parent.letsencrypt.challenge(req.url.slice(leChallengePrefix.length), getCleanHostname(req), function (response) { if (response == null) { res.sendStatus(404); } else { res.send(response); } }); } else { // Everything else var selfurl = (' wss://' + req.headers.host); res.set({ 'strict-transport-security': 'max-age=60000; includeSubDomains', 'Referrer-Policy': 'no-referrer', 'x-frame-options': 'SAMEORIGIN', 'X-XSS-Protection': '1; mode=block', 'X-Content-Type-Options': 'nosniff', 'Content-Security-Policy': "default-src 'none'; style-src 'self' 'unsafe-inline';" }); return next(); } }); // Once the main web server is started, call this to hookup additional handlers obj.hookMainWebServer = function (certs) { obj.certificates = certs; for (var i in parent.config.domains) { if (parent.config.domains[i].dns != null) { continue; } var url = parent.config.domains[i].url; obj.app.post(url + 'amtevents.ashx', obj.parent.webserver.handleAmtEventRequest); obj.app.get(url + 'meshsettings', obj.parent.webserver.handleMeshSettingsRequest); obj.app.get(url + 'meshagents', obj.parent.webserver.handleMeshAgentRequest); // Server redirects if (parent.config.domains[i].redirects) { for (var j in parent.config.domains[i].redirects) { if (j[0] != '_') { obj.app.get(url + j, obj.parent.webserver.handleDomainRedirect); } } } } } // Setup all HTTP redirection handlers //obj.app.set("etag", false); for (var i in parent.config.domains) { if (parent.config.domains[i].dns != null) { continue; } var url = parent.config.domains[i].url; obj.app.get(url, performRedirection); // Root redirection // Setup any .well-known folders var p = obj.parent.path.join(obj.parent.datapath, '.well-known' + ((parent.config.domains[i].id == '') ? '' : ('-' + parent.config.domains[i].id))); if (obj.parent.fs.existsSync(p)) { obj.app.use(url + '.well-known', obj.express.static(p)); } // Setup all of the redirections to HTTPS const redirections = ['player.htm', 'terms', 'logout', 'MeshServerRootCert.cer', 'mescript.ashx', 'checkmail', 'agentinvite', 'messenger', 'meshosxagent', 'devicepowerevents.ashx', 'downloadfile.ashx', 'userfiles/*', 'webrelay.ashx', 'health.ashx', 'logo.png', 'welcome.jpg']; for (i in redirections) { obj.app.get(url + redirections[i], performRedirection); } } // Find a free port starting with the specified one and going up. function CheckListenPort(port, addr, func) { var s = obj.net.createServer(function (socket) { }); obj.tcpServer = s.listen(port, addr, function () { s.close(function () { if (func) { func(port, addr); } }); }).on("error", function (err) { if (args.exactports) { console.error("ERROR: MeshCentral HTTP server port " + port + " not available."); process.exit(); } else { if (port < 65535) { CheckListenPort(port + 1, addr, func); } else { if (func) { func(0); } } } }); } // Start the ExpressJS web server, if the port is busy try the next one. function StartRedirServer(port, addr) { if (port == 0 || port == 65535) { return; } obj.tcpServer = obj.app.listen(port, addr, function () { obj.port = port; console.log("MeshCentral HTTP redirection server running on port " + port + "."); obj.parent.authLog('http', 'Server listening on ' + ((addr != null)?addr:'0.0.0.0') + ' port ' + port + '.'); obj.parent.updateServerState('redirect-port', port); func(obj.port); }).on('error', function (err) { if ((err.code == 'EACCES') && (port < 65535)) { StartRedirServer(port + 1); } else { console.log(err); func(obj.port); } }); } // Get the remote hostname correctly const servernameRe = /^[a-z0-9\.\-]+$/i; function getHostname(req) { return req.hostname || req.headers['x-forwarded-host'] || (req.headers.host || ''); }; function getCleanHostname(req) { var servername = getHostname(req).toLowerCase().replace(/:.*/, ''); try { req.hostname = servername; } catch (e) { } // read-only express property if (req.headers['x-forwarded-host']) { req.headers['x-forwarded-host'] = servername; } try { req.headers.host = servername; } catch (e) { } return (servernameRe.test(servername) && -1 === servername.indexOf('..') && servername) || ''; }; CheckListenPort(args.redirport, args.redirportbind, StartRedirServer); return obj; };