/** * @description MeshCentral Multi-Server Support * @author Ylian Saint-Hilaire * @copyright Intel Corporation 2018-2022 * @license Apache-2.0 * @version v0.0.1 */ /*jslint node: true */ /*jshint node: true */ /*jshint strict:false */ /*jshint -W097 */ /*jshint esversion: 6 */ 'use strict'; // Construct a Mesh Multi-Server object. This is used for MeshCentral-to-MeshCentral communication. module.exports.CreateMultiServer = function (parent, args) { var obj = {}; const WebSocket = require('ws'); obj.parent = parent; obj.crypto = require('crypto'); obj.peerConfig = parent.config.peers; obj.forge = require('node-forge'); obj.outPeerServers = {}; // Outgoing peer servers obj.peerServers = {}; // All connected servers (in & out). Only present in this list if the connection is setup obj.serverid = null; // Create a mesh server module that will connect to other servers obj.CreatePeerOutServer = function (parent, serverid, url) { var obj = {}; obj.parent = parent; obj.serverid = serverid; obj.url = url; obj.ws = null; obj.certificates = parent.parent.certificates; obj.common = require('./common.js'); obj.forge = require('node-forge'); obj.crypto = require('crypto'); obj.connectionState = 0; obj.retryTimer = null; obj.retryBackoff = 0; obj.connectHandler = null; obj.webCertificateHash = obj.parent.parent.webserver.webCertificateHash; obj.agentCertificateHashBase64 = obj.parent.parent.webserver.agentCertificateHashBase64; obj.agentCertificateAsn1 = obj.parent.parent.webserver.agentCertificateAsn1; obj.peerServerId = null; obj.authenticated = 0; obj.serverCertHash = null; obj.pendingData = []; // Disconnect from the server and/or stop trying obj.stop = function () { obj.connectionState = 0; disconnect(); }; // Make one attempt at connecting to the server function connect() { obj.retryTimer = null; obj.connectionState = 1; // Get the web socket setup obj.ws = new WebSocket(obj.url + 'meshserver.ashx', { rejectUnauthorized: false, servername: obj.certificates.CommonName, cert: obj.certificates.agent.cert, key: obj.certificates.agent.key }); obj.parent.parent.debug('peer', 'OutPeer ' + obj.serverid + ': Connecting to: ' + url + 'meshserver.ashx'); // Register the connection failed event obj.ws.on('error', function (error) { obj.parent.parent.debug('peer', 'OutPeer ' + obj.serverid + ': Error: ' + error); disconnect(); }); obj.ws.on('close', function () { obj.parent.parent.debug('peer', 'OutPeer ' + obj.serverid + ': Disconnected'); disconnect(); }); // Register the connection event obj.ws.on('open', function () { obj.parent.parent.debug('peer', 'OutPeer ' + obj.serverid + ': Connected'); obj.connectionState |= 2; obj.nonce = obj.crypto.randomBytes(48).toString('binary'); // Get the peer server's certificate and compute the server public key hash if (obj.ws._socket == null) return; if (obj.url.toLowerCase().startsWith('wss://')) { // We are using TLS, use the certificate hash var serverCert = obj.forge.pki.certificateFromAsn1(obj.forge.asn1.fromDer(obj.ws._socket.getPeerCertificate().raw.toString('binary'))); obj.serverCertHash = obj.forge.pki.getPublicKeyFingerprint(serverCert.publicKey, { encoding: 'binary', md: obj.forge.md.sha384.create() }); } else { // We are not using TLS, blank out the TLS certificate hash obj.serverCertHash = Buffer.alloc(48).toString('binary'); } // Start authenticate the peer server by sending a auth nonce & server TLS cert hash. // Send 384 bits SHA384 hash of TLS cert public key + 384 bits nonce obj.ws.send(Buffer.from(obj.common.ShortToStr(1) + obj.serverCertHash + obj.nonce, 'binary')); // Command 1, hash + nonce }); // If a message is received obj.ws.on('message', function (msg) { if (typeof msg != 'string') { msg = msg.toString('binary'); } if (msg.length < 2) return; if (msg.charCodeAt(0) == 123) { if ((obj.connectionState & 4) != 0) { processServerData(msg); } else { obj.pendingData.push(msg); } } else { var cmd = obj.common.ReadShort(msg, 0); switch (cmd) { case 1: { // Server authentication request if (msg.length != 98) { obj.parent.parent.debug('peer', 'OutPeer: Bad server authentication message, length = ' + msg.length + ', should be 98. HEX: ' + Buffer.from(msg.substring(0, 4096), 'binary').toString('hex')); return; } // Check that the server hash matches the TLS server certificate public key hash if (obj.url.toLowerCase().startsWith('wss://') && (obj.serverCertHash != msg.substring(2, 50))) { obj.parent.parent.debug('peer', 'OutPeer: Server hash mismatch.'); disconnect(); return; } obj.servernonce = msg.substring(50); // Perform the hash signature using the server agent certificate obj.parent.parent.certificateOperations.acceleratorPerformSignature(0, msg.substring(2) + obj.nonce, null, function (tag, signature) { // Send back our certificate + signature if (obj.ws != null) { obj.ws.send(Buffer.from(obj.common.ShortToStr(2) + obj.common.ShortToStr(obj.agentCertificateAsn1.length) + obj.agentCertificateAsn1 + signature, 'binary')); } // Command 2, certificate + signature }); break; } case 2: { // Server certificate var certlen = obj.common.ReadShort(msg, 2), serverCert = null; var serverCertPem = '-----BEGIN CERTIFICATE-----\r\n' + Buffer.from(msg.substring(4, 4 + certlen), 'binary').toString('base64') + '\r\n-----END CERTIFICATE-----'; try { serverCert = obj.forge.pki.certificateFromAsn1(obj.forge.asn1.fromDer(msg.substring(4, 4 + certlen))); } catch (e) { } if (serverCert == null) { obj.parent.parent.debug('peer', 'OutPeer: Invalid server certificate.'); disconnect(); return; } var serverid = Buffer.from(obj.forge.pki.getPublicKeyFingerprint(serverCert.publicKey, { encoding: 'binary', md: obj.forge.md.sha384.create() }), 'binary').toString('base64').replace(/\+/g, '@').replace(/\//g, '$'); if (serverid !== obj.agentCertificateHashBase64) { obj.parent.parent.debug('peer', 'OutPeer: Server hash mismatch.'); disconnect(); return; } // Server signature, verify it. This is the fast way, without using forge. (TODO: Use accelerator for this?) const verify = obj.parent.crypto.createVerify('SHA384'); verify.end(Buffer.from(obj.serverCertHash + obj.nonce + obj.servernonce, 'binary')); if (verify.verify(serverCertPem, Buffer.from(msg.substring(4 + certlen), 'binary')) !== true) { obj.parent.parent.debug('peer', 'OutPeer: Server sign check failed.'); disconnect(); return; } // Connection is a success, clean up delete obj.nonce; delete obj.servernonce; obj.serverCertHash = Buffer.from(obj.serverCertHash, 'binary').toString('base64').replace(/\+/g, '@').replace(/\//g, '$'); // Change this value to base64 obj.connectionState |= 4; obj.retryBackoff = 0; // Set backoff connection timer back to fast. obj.parent.parent.debug('peer', 'OutPeer ' + obj.serverid + ': Verified peer connection to ' + obj.url); // Send information about our server to the peer if (obj.connectionState == 15) { obj.send({ action: 'info', serverid: obj.parent.serverid, dbid: obj.parent.parent.db.identifier, key: obj.parent.parent.serverKey.toString('hex'), serverCertHash: obj.parent.parent.webserver.webCertificateHashBase64 }); for (var i in obj.pendingData) { processServerData(obj.pendingData[i]); } // Process any pending data obj.pendingData = []; } //if ((obj.connectionState == 15) && (obj.connectHandler != null)) { obj.connectHandler(1); } break; } case 4: { // Peer server confirmed authentication, we are allowed to send commands to the server obj.connectionState |= 8; if (obj.connectionState == 15) { obj.send({ action: 'info', serverid: obj.parent.serverid, dbid: obj.parent.parent.db.identifier, key: obj.parent.parent.serverKey.toString('hex'), serverCertHash: obj.parent.parent.webserver.webCertificateHashBase64 }); for (var i in obj.pendingData) { processServerData(obj.pendingData[i]); } // Process any pending data obj.pendingData = []; } //if ((obj.connectionState == 15) && (obj.connectHandler != null)) { obj.connectHandler(1); } break; } default: { obj.parent.parent.debug('peer', 'OutPeer ' + obj.serverid + ': Un-handled command: ' + cmd); break; } } } }); } // Disconnect from the server, if we need to, try again with a delay. function disconnect() { if (obj.authenticated == 3) { obj.parent.ClearPeerServer(obj, obj.peerServerId); obj.authenticated = 0; } if ((obj.connectionState == 15) && (obj.connectHandler != null)) { obj.connectHandler(0); } if (obj.ws != null) { obj.ws.close(); obj.ws = null; } if (obj.retryTimer != null) { clearTimeout(obj.retryTimer); obj.retryTimer = null; } // Re-try connection if (obj.connectionState >= 1) { obj.connectionState = 1; if (obj.retryTimer == null) { obj.retryTimer = setTimeout(connect, getConnectRetryTime()); } } } // Get the next retry time in milliseconds function getConnectRetryTime() { // The (random & 0x1FFF) creates a random number between 0 and 4096. if (obj.retryBackoff < 30000) { obj.retryBackoff += ((require('crypto').randomBytes(4).readUInt32BE(0) & 0x1FFF) + 1000); } return obj.retryBackoff; } // Send a JSON message to the peer server obj.send = function (msg) { try { if (obj.ws == null || obj.connectionState != 15) { return; } if (typeof msg == 'string') { obj.ws.send(msg); return; } if (typeof msg == 'object') { obj.ws.send(JSON.stringify(msg)); return; } } catch (ex) { } }; // Process incoming peer server JSON data function processServerData(msg) { var str = msg.toString('utf8'), command = null; if (str[0] == '{') { try { command = JSON.parse(str); } catch (e) { obj.parent.parent.debug('peer', 'Unable to parse server JSON (' + obj.remoteaddr + ').'); return; } // If the command can't be parsed, ignore it. if (command.action == 'info') { if (obj.authenticated != 3) { // We get the peer's serverid and database identifier. if ((command.serverid != null) && (command.dbid != null)) { if (command.serverid == obj.parent.serverid) { console.log('ERROR: Same server ID, trying to peer with self. (' + obj.url + ', ' + command.serverid + ').'); return; } if (command.dbid != obj.parent.parent.db.identifier) { console.log('ERROR: Database ID mismatch. Trying to peer to a server with the wrong database. (' + obj.url + ', ' + command.serverid + ').'); return; } if (obj.url.toLowerCase().startsWith('wss://') && (obj.serverCertHash != command.serverCertHash)) { console.log('ERROR: Outer certificate hash mismatch (2). (' + obj.url + ', ' + command.serverid + ').'); return; } obj.peerServerId = command.serverid; obj.peerServerKey = Buffer.from(command.key, 'hex'); obj.authenticated = 3; obj.parent.SetupPeerServer(obj, obj.peerServerId); } } } else if (obj.authenticated == 3) { // Pass the message to the parent object for processing. obj.parent.ProcessPeerServerMessage(obj, obj.peerServerId, command); } } } connect(); return obj; }; // Create a mesh server module that received a connection to another server obj.CreatePeerInServer = function (parent, ws, req, tls) { var obj = {}; obj.ws = ws; obj.tls = tls; obj.parent = parent; obj.common = require('./common.js'); obj.forge = require('node-forge'); obj.crypto = require('crypto'); obj.authenticated = 0; obj.remoteaddr = obj.ws._socket.remoteAddress; obj.receivedCommands = 0; obj.webCertificateHash = obj.parent.parent.webserver.webCertificateHash; obj.agentCertificateHashBase64 = obj.parent.parent.webserver.agentCertificateHashBase64; obj.agentCertificateAsn1 = obj.parent.parent.webserver.agentCertificateAsn1; obj.infoSent = 0; obj.peerServerId = null; obj.serverCertHash = null; obj.pendingData = []; if (obj.remoteaddr.startsWith('::ffff:')) { obj.remoteaddr = obj.remoteaddr.substring(7); } obj.parent.parent.debug('peer', 'InPeer: Connected (' + obj.remoteaddr + ')'); // Send a message to the peer server obj.send = function (msg) { try { if (typeof msg == 'string') { obj.ws.send(msg); return; } if (typeof msg == 'object') { obj.ws.send(JSON.stringify(msg)); return; } } catch (ex) { } }; // Disconnect this server obj.close = function (arg) { if ((arg == 1) || (arg == null)) { try { obj.ws.close(); obj.parent.parent.debug('peer', 'InPeer: Soft disconnect ' + obj.peerServerId + ' (' + obj.remoteaddr + ')'); } catch (e) { console.log(e); } } // Soft close, close the websocket if (arg == 2) { try { obj.ws._socket._parent.end(); obj.parent.parent.debug('peer', 'InPeer: Hard disconnect ' + obj.peerServerId + ' (' + obj.remoteaddr + ')'); } catch (e) { console.log(e); } } // Hard close, close the TCP socket if (obj.authenticated == 3) { obj.parent.ClearPeerServer(obj, obj.peerServerId); obj.authenticated = 0; } }; // When data is received from the peer server web socket ws.on('message', function (msg) { if (typeof msg != 'string') { msg = msg.toString('binary'); } if (msg.length < 2) return; if (msg.charCodeAt(0) == 123) { if (msg.length < 2) return; if (obj.authenticated >= 2) { processServerData(msg); } else { obj.pendingData.push(msg); } } else if (obj.authenticated < 2) { // We are not authenticated var cmd = obj.common.ReadShort(msg, 0); if (cmd == 1) { // Peer server authentication request if ((msg.length != 98) || ((obj.receivedCommands & 1) != 0)) return; obj.receivedCommands += 1; // Peer server can't send the same command twice on the same connection ever. Block DOS attack path. // Check that the server hash matches out own web certificate hash if ((obj.tls == true) && (obj.webCertificateHash != msg.substring(2, 50))) { obj.close(); return; } obj.peernonce = msg.substring(50); // Perform the hash signature using the server agent certificate obj.parent.parent.certificateOperations.acceleratorPerformSignature(0, msg.substring(2) + obj.nonce, null, function (tag, signature) { // Send back our certificate + signature obj.ws.send(Buffer.from(obj.common.ShortToStr(2) + obj.common.ShortToStr(obj.agentCertificateAsn1.length) + obj.agentCertificateAsn1 + signature, 'binary')); // Command 2, certificate + signature }); // Check the peer server signature if we can if (obj.unauthsign != null) { if (processPeerSignature(obj.unauthsign) == false) { obj.close(); return; } else { completePeerServerConnection(); } } } else if (cmd == 2) { // Peer server certificate if ((msg.length < 4) || ((obj.receivedCommands & 2) != 0)) { obj.parent.parent.debug('peer', 'InPeer: Invalid command 2.'); return; } obj.receivedCommands += 2; // Peer server can't send the same command twice on the same connection ever. Block DOS attack path. // Decode the certificate var certlen = obj.common.ReadShort(msg, 2); obj.unauth = {}; try { obj.unauth.nodeid = Buffer.from(obj.forge.pki.getPublicKeyFingerprint(obj.forge.pki.certificateFromAsn1(obj.forge.asn1.fromDer(msg.substring(4, 4 + certlen))).publicKey, { encoding: 'binary', md: obj.forge.md.sha384.create() }), 'binary').toString('base64').replace(/\+/g, '@').replace(/\//g, '$'); } catch (e) { console.log(e); return; } obj.unauth.nodeCertPem = '-----BEGIN CERTIFICATE-----\r\n' + Buffer.from(msg.substring(4, 4 + certlen), 'binary').toString('base64') + '\r\n-----END CERTIFICATE-----'; // Check the peer server signature if we can if (obj.peernonce == null) { obj.unauthsign = msg.substring(4 + certlen); } else { if (processPeerSignature(msg.substring(4 + certlen)) == false) { obj.parent.parent.debug('peer', 'InPeer: Invalid signature.'); obj.close(); return; } } completePeerServerConnection(); } else if (cmd == 3) { if ((msg.length < 56) || ((obj.receivedCommands & 4) != 0)) { obj.parent.parent.debug('peer', 'InPeer: Invalid command 3.'); return; } obj.receivedCommands += 4; // Peer server can't send the same command twice on the same connection ever. Block DOS attack path. completePeerServerConnection(); } } }); // If error, do nothing ws.on('error', function (err) { obj.parent.parent.debug('peer', 'InPeer: Connection Error: ' + err); }); // If the peer server web socket is closed, clean up. ws.on('close', function (req) { obj.parent.parent.debug('peer', 'InPeer disconnect ' + obj.nodeid + ' (' + obj.remoteaddr + ')'); obj.close(0); }); // obj.ws._socket._parent.on('close', function (req) { obj.parent.parent.debug('peer', 'Peer server TCP disconnect ' + obj.nodeid + ' (' + obj.remoteaddr + ')'); }); // Start authenticate the peer server by sending a auth nonce & server TLS cert hash. // Send 384 bits SHA382 hash of TLS cert public key + 384 bits nonce obj.nonce = obj.crypto.randomBytes(48).toString('binary'); obj.ws.send(Buffer.from(obj.common.ShortToStr(1) + obj.webCertificateHash + obj.nonce, 'binary')); // Command 1, hash + nonce // Once we get all the information about an peer server, run this to hook everything up to the server function completePeerServerConnection() { if (obj.authenticated != 1) return; obj.ws.send(Buffer.from(obj.common.ShortToStr(4), 'binary')); obj.send({ action: 'info', serverid: obj.parent.serverid, dbid: obj.parent.parent.db.identifier, key: obj.parent.parent.serverKey.toString('hex'), serverCertHash: obj.parent.parent.webserver.webCertificateHashBase64 }); obj.authenticated = 2; // Process any pending data that was received before peer authentication for (var i in obj.pendingData) { processServerData(obj.pendingData[i]); } obj.pendingData = null; } // Verify the peer server signature function processPeerSignature(msg) { // Verify the signature. This is the fast way, without using forge. const verify = obj.parent.crypto.createVerify('SHA384'); verify.end(Buffer.from(obj.parent.parent.webserver.webCertificateHash + obj.nonce + obj.peernonce, 'binary')); if (verify.verify(obj.unauth.nodeCertPem, Buffer.from(msg, 'binary')) !== true) { console.log('Peer sign fail 1'); return false; } if (obj.unauth.nodeid !== obj.agentCertificateHashBase64) { console.log('Peer sign fail 2'); return false; } // Connection is a success, clean up obj.nodeid = obj.unauth.nodeid; delete obj.nonce; delete obj.peernonce; delete obj.unauth; if (obj.unauthsign) delete obj.unauthsign; obj.authenticated = 1; return true; } // Process incoming peer server JSON data function processServerData(msg) { var str = msg.toString('utf8'), command = null; if (str[0] == '{') { try { command = JSON.parse(str); } catch (e) { obj.parent.parent.debug('peer', 'Unable to parse server JSON (' + obj.remoteaddr + ').'); return; } // If the command can't be parsed, ignore it. if (command.action == 'info') { if (obj.authenticated != 3) { // We get the peer's serverid and database identifier. if ((command.serverid != null) && (command.dbid != null)) { if (command.serverid == obj.parent.serverid) { console.log('ERROR: Same server ID, trying to peer with self. (' + obj.remoteaddr + ', ' + command.serverid + ').'); return; } if (command.dbid != obj.parent.parent.db.identifier) { console.log('ERROR: Database ID mismatch. Trying to peer to a server with the wrong database. (' + obj.remoteaddr + ', ' + command.serverid + ').'); return; } if (obj.parent.peerConfig.servers[command.serverid] == null) { console.log('ERROR: Unknown peer serverid: ' + command.serverid + ' (' + obj.remoteaddr + ').'); return; } obj.peerServerId = command.serverid; obj.peerServerKey = Buffer.from(command.key, 'hex'); obj.serverCertHash = command.serverCertHash; obj.authenticated = 3; obj.parent.SetupPeerServer(obj, obj.peerServerId); } } } else if (obj.authenticated == 3) { // Pass the message to the parent object for processing. obj.parent.ProcessPeerServerMessage(obj, obj.peerServerId, command); } } } return obj; }; // If we have no peering configuration, don't setup this object if (obj.peerConfig == null) { return null; } obj.serverid = obj.parent.config.peers.serverid; if (obj.serverid == null) { obj.serverid = require("os").hostname().toLowerCase(); } else { obj.serverid = obj.serverid.toLowerCase(); } if (args.serverid != null) { obj.serverid = args.serverid.toLowerCase(); } if (obj.parent.config.peers.servers[obj.serverid] == null) { console.log("Error: Unable to peer with other servers, \"" + obj.serverid + "\" not present in peer servers list."); return null; } //console.log('Server peering ID: ' + obj.serverid); // Return the private key of a peer server obj.getServerCookieKey = function (serverid) { var server = obj.peerServers[serverid]; if (server && server.peerServerKey) return server.peerServerKey; return null; }; // Dispatch an event to all other MeshCentral2 peer servers obj.DispatchEvent = function (ids, source, event) { for (var serverid in obj.peerServers) { obj.peerServers[serverid].send({ action: 'bus', ids: ids, event: event }); } }; // Dispatch a message to other MeshCentral2 peer servers obj.DispatchMessage = function (msg) { for (var serverid in obj.peerServers) { obj.peerServers[serverid].send(msg); } }; // Dispatch a message to other MeshCentral2 peer servers obj.DispatchMessageSingleServer = function (msg, serverid) { var server = obj.peerServers[serverid]; if (server != null) { server.send(msg); } }; // Attempt to connect to all peers obj.ConnectToPeers = function () { for (var serverId in obj.peerConfig.servers) { // We will only connect to names that are larger then ours. This way, eveyone has one connection to everyone else (no cross-connections). if ((serverId > obj.serverid) && (obj.peerConfig.servers[serverId].url != null) && (obj.outPeerServers[serverId] == null)) { obj.outPeerServers[serverId] = obj.CreatePeerOutServer(obj, serverId, obj.peerConfig.servers[serverId].url); } } }; // We connected to a peer server, setup everything obj.SetupPeerServer = function (server, peerServerId) { obj.parent.debug('peer', 'Connected to peer server ' + peerServerId + '.'); //console.log('Connected to peer server ' + peerServerId + '.'); obj.peerServers[peerServerId] = server; // Send the list of connections to the peer server.send({ action: 'connectivityTable', connectivityTable: obj.parent.peerConnectivityByNode[obj.parent.serverId] }); // Send a list of user sessions to the peer server.send({ action: 'sessionsTable', sessionsTable: Object.keys(obj.parent.webserver.wssessions2) }); }; // We disconnected to a peer server, clean up everything obj.ClearPeerServer = function (server, peerServerId) { obj.parent.debug('peer', 'Disconnected from peer server ' + peerServerId + '.'); //console.log('Disconnected from peer server ' + peerServerId + '.'); // Clean up the connectivity state delete obj.peerServers[peerServerId]; var oldList = obj.parent.peerConnectivityByNode[peerServerId]; obj.parent.peerConnectivityByNode[peerServerId] = {}; obj.parent.UpdateConnectivityState(oldList); // Clean up the sessions list for (var i in obj.parent.webserver.wsPeerSessions[peerServerId]) { delete obj.parent.webserver.wsPeerSessions2[obj.parent.webserver.wsPeerSessions[peerServerId][i]]; } delete obj.parent.webserver.wsPeerSessions[peerServerId]; delete obj.parent.webserver.wsPeerSessions3[peerServerId]; obj.parent.webserver.recountSessions(); // Recount all sessions }; // Process a message coming from a peer server obj.ProcessPeerServerMessage = function (server, peerServerId, msg) { var userid, i; //console.log('ProcessPeerServerMessage', peerServerId, msg.action); switch (msg.action) { case 'mqtt': { if ((obj.parent.mqttbroker != null) && (msg.nodeid != null)) { obj.parent.mqttbroker.publishNoPeers(msg.nodeid, msg.topic, msg.message); } // Dispatch in the MQTT broker break; } case 'bus': { obj.parent.DispatchEvent(msg.ids, null, msg.event, true); // Dispatch the peer event break; } case 'connectivityTable': { obj.parent.peerConnectivityByNode[peerServerId] = msg.connectivityTable; obj.parent.UpdateConnectivityState(msg.connectivityTable); break; } case 'sessionsTable': { obj.parent.webserver.wsPeerSessions[peerServerId] = msg.sessionsTable; var userToSession = {}; for (i in msg.sessionsTable) { var sessionid = msg.sessionsTable[i]; obj.parent.webserver.wsPeerSessions2[sessionid] = peerServerId; userid = sessionid.split('/').slice(0, 3).join('/'); // Take the sessionid and keep only the userid partion if (userToSession[userid] == null) { userToSession[userid] = [sessionid]; } else { userToSession[userid].push(sessionid); } // UserId -> [ SessionId ] } obj.parent.webserver.wsPeerSessions3[peerServerId] = userToSession; // ServerId --> UserId --> SessionId obj.parent.webserver.recountSessions(); // Recount all sessions break; } case 'sessionStart': { obj.parent.webserver.wsPeerSessions[peerServerId].push(msg.sessionid); obj.parent.webserver.wsPeerSessions2[msg.sessionid] = peerServerId; userid = msg.sessionid.split('/').slice(0, 3).join('/'); if (obj.parent.webserver.wsPeerSessions3[peerServerId] == null) { obj.parent.webserver.wsPeerSessions3[peerServerId] = {}; } if (obj.parent.webserver.wsPeerSessions3[peerServerId][userid] == null) { obj.parent.webserver.wsPeerSessions3[peerServerId][userid] = [msg.sessionid]; } else { obj.parent.webserver.wsPeerSessions3[peerServerId][userid].push(msg.sessionid); } obj.parent.webserver.recountSessions(msg.sessionid); // Recount a specific user break; } case 'sessionEnd': { i = obj.parent.webserver.wsPeerSessions[peerServerId].indexOf(msg.sessionid); if (i >= 0) { obj.parent.webserver.wsPeerSessions[peerServerId].splice(i, 1); } delete obj.parent.webserver.wsPeerSessions2[msg.sessionid]; userid = msg.sessionid.split('/').slice(0, 3).join('/'); if (obj.parent.webserver.wsPeerSessions3[peerServerId][userid] != null) { i = obj.parent.webserver.wsPeerSessions3[peerServerId][userid].indexOf(msg.sessionid); if (i >= 0) { obj.parent.webserver.wsPeerSessions3[peerServerId][userid].splice(i, 1); if (obj.parent.webserver.wsPeerSessions3[peerServerId][userid].length == 0) { delete obj.parent.webserver.wsPeerSessions3[peerServerId][userid]; } } } obj.parent.webserver.recountSessions(msg.sessionid); // Recount a specific user break; } case 'SetConnectivityState': { obj.parent.SetConnectivityState(msg.meshid, msg.nodeid, msg.connectTime, msg.connectType, msg.powerState, peerServerId, msg.extraInfo); break; } case 'ClearConnectivityState': { obj.parent.ClearConnectivityState(msg.meshid, msg.nodeid, msg.connectType, peerServerId, msg.extraInfo); break; } case 'relay': { // Check if there is a waiting session var rsession = obj.parent.webserver.wsrelays[msg.id]; if (rsession != null) { // Yes, there is a waiting session, see if we must initiate. if (peerServerId > obj.parent.serverId) { // We must initiate the connection to the peer userid = null; if (rsession.peer1.user != null) { userid = rsession.peer1.user._id; } obj.createPeerRelay(rsession.peer1.ws, rsession.peer1.req, peerServerId, userid); delete obj.parent.webserver.wsrelays[msg.id]; } } else { // Add this relay session to the peer relay list obj.parent.webserver.wsPeerRelays[msg.id] = { serverId: peerServerId, time: Date.now() }; // Clear all relay sessions that are more than 1 minute var oneMinuteAgo = Date.now() - 60000; for (i in obj.parent.webserver.wsPeerRelays) { if (obj.parent.webserver.wsPeerRelays[i].time < oneMinuteAgo) { delete obj.parent.webserver.wsPeerRelays[i]; } } } break; } case 'msg': { if (msg.sessionid != null) { // Route this message to a connected user session if (msg.fromNodeid != null) { msg.nodeid = msg.fromNodeid; delete msg.fromNodeid; } var ws = obj.parent.webserver.wssessions2[msg.sessionid]; if (ws != null) { ws.send(JSON.stringify(msg)); } } else if (msg.nodeid != null) { // Route this message to a connected agent if (msg.fromSessionid != null) { msg.sessionid = msg.fromSessionid; delete msg.fromSessionid; } var agent = obj.parent.webserver.wsagents[msg.nodeid]; if (agent != null) { delete msg.nodeid; agent.send(JSON.stringify(msg)); } // Remove the nodeid since it's implyed and send the message to the agent } else if (msg.meshid != null) { // Route this message to all users of this mesh if (msg.fromNodeid != null) { msg.nodeid = msg.fromNodeid; delete msg.fromNodeid; } var cmdstr = JSON.stringify(msg); for (userid in obj.parent.webserver.wssessions) { // Find all connected users for this mesh and send the message if (parent.webserver.GetMeshRights(userid, msg.meshid) != 0) { // TODO: Look at what rights are needed for message routing var sessions = obj.parent.webserver.wssessions[userid]; // Send the message to all users on this server for (i in sessions) { sessions[i].send(cmdstr); } } } } break; } case 'newIntelAmtPolicy': { // See if any agents for the affected device group is connected, if so, update the Intel AMT policy for (var nodeid in obj.parent.webserver.wsagents) { const agent = obj.parent.webserver.wsagents[nodeid]; if (agent.dbMeshKey == msg.meshid) { agent.sendUpdatedIntelAmtPolicy(msg.amtpolicy); } } break; } case 'agentMsgByMeshId': { // See if any agents for the target device group is connected, if so, send the message const jsonCmd = JSON.stringify(msg.command); for (var nodeid in obj.parent.webserver.wsagents) { var agent = obj.parent.webserver.wsagents[nodeid]; if (agent.dbMeshKey == msg.meshid) { try { agent.send(jsonCmd); } catch (ex) { } } } break; } default: { // Unknown peer server command console.log('Unknown action from peer server ' + peerServerId + ': ' + msg.action + '.'); break; } } }; // Create a tunnel connection to a peer server obj.createPeerRelay = function (ws, req, serverid, user) { var server = obj.peerServers[serverid]; if ((server == null) || (server.peerServerKey == null)) { return null; } var cookieKey = server.peerServerKey; // Parse the user if needed if (typeof user == 'string') { user = { _id: user, domain: user.split('/')[1] }; } // Build the connection URL var path = req.path; if (path[0] == '/') path = path.substring(1); if (path.substring(path.length - 11) == '/.websocket') { path = path.substring(0, path.length - 11); } var queryStr = ''; for (var i in req.query) { if (i.toLowerCase() != 'auth') { queryStr += ((queryStr == '') ? '?' : '&') + i + '=' + req.query[i]; } } if (user != null) { queryStr += ((queryStr == '') ? '?' : '&') + 'auth=' + obj.parent.encodeCookie({ userid: user._id, domainid: user.domain, ps: 1 }, cookieKey); } var url = obj.peerConfig.servers[serverid].url + path + queryStr; // Setup an connect the web socket var tunnel = obj.createPeerRelayEx(ws, url, serverid); tunnel.connect(); }; // Create a tunnel connection to a peer server // We assume that "ws" is paused already. obj.createPeerRelayEx = function (ws, url, serverid) { var peerTunnel = { parent: obj, ws1: ws, ws2: null, url: url, serverid: serverid }; peerTunnel.connect = function () { // Get the web socket setup peerTunnel.parent.parent.debug('peer', 'FTunnel ' + peerTunnel.serverid + ': Start connect to ' + peerTunnel.url); peerTunnel.ws2 = new WebSocket(peerTunnel.url, { rejectUnauthorized: false, servername: this.parent.parent.certificates.CommonName, cert: this.parent.parent.certificates.agent.cert, key: this.parent.parent.certificates.agent.key }); // Register the connection failed event peerTunnel.ws2.on('error', function (error) { peerTunnel.parent.parent.debug('peer', 'FTunnel ' + obj.serverid + ': Connection error'); peerTunnel.close(); }); // If the peer server web socket is closed, clean up. peerTunnel.ws2.on('close', function (req) { peerTunnel.parent.parent.debug('peer', 'FTunnel disconnect ' + peerTunnel.serverid); peerTunnel.close(); }); // If a message is received from the peer, Peer ---> Browser (TODO: Pipe this?) peerTunnel.ws2.on('message', function (msg) { try { peerTunnel.ws2._socket.pause(); peerTunnel.ws1.send(msg, function () { peerTunnel.ws2._socket.resume(); }); } catch (e) { } }); // Register the connection event peerTunnel.ws2.on('open', function () { peerTunnel.parent.parent.debug('peer', 'FTunnel ' + peerTunnel.serverid + ': Connected'); if (peerTunnel.ws2._socket.getPeerCertificate != null) { // Get the peer server's certificate and compute the server public key hash var serverCert = obj.forge.pki.certificateFromAsn1(obj.forge.asn1.fromDer(peerTunnel.ws2._socket.getPeerCertificate().raw.toString('binary'))); var serverCertHashHex = Buffer.from(obj.forge.pki.getPublicKeyFingerprint(serverCert.publicKey, { encoding: 'binary', md: obj.forge.md.sha384.create() }), 'binary').toString('base64').replace(/\+/g, '@').replace(/\//g, '$'); // Check if the peer certificate is the expected one for this serverid if ((obj.peerServers[serverid] == null) || (obj.peerServers[serverid].serverCertHash != serverCertHashHex)) { console.log('ERROR: Outer certificate hash mismatch (1). (' + peerTunnel.url + ', ' + peerTunnel.serverid + ').'); peerTunnel.close(); return; } } // Connection accepted, resume the web socket to start the data flow peerTunnel.ws1._socket.resume(); }); // If a message is received from the browser, Browser ---> Peer peerTunnel.ws1.on('message', function (msg) { try { peerTunnel.ws1._socket.pause(); peerTunnel.ws2.send(msg, function () { peerTunnel.ws1._socket.resume(); }); } catch (e) { } }); // If error, do nothing peerTunnel.ws1.on('error', function (err) { peerTunnel.close(); }); // If the web socket is closed, close the associated TCP connection. peerTunnel.ws1.on('close', function (req) { peerTunnel.parent.parent.debug('peer', 'FTunnel disconnect ' + peerTunnel.serverid); peerTunnel.close(); }); }; // Disconnect both sides of the tunnel peerTunnel.close = function (arg) { if (arg == 2) { // Hard close, close the TCP socket if (peerTunnel.ws1 != null) { try { peerTunnel.ws1._socket._parent.end(); peerTunnel.parent.parent.debug('peer', 'FTunnel1: Hard disconnect'); } catch (e) { console.log(e); } delete peerTunnel.ws1; } if (peerTunnel.ws2 != null) { try { peerTunnel.ws2._socket._parent.end(); peerTunnel.parent.parent.debug('peer', 'FTunnel2: Hard disconnect'); } catch (e) { console.log(e); } delete peerTunnel.ws2; } } else { // Soft close, close the websocket if (peerTunnel.ws1 != null) { try { peerTunnel.ws1.close(); peerTunnel.parent.parent.debug('peer', 'FTunnel1: Soft disconnect '); } catch (e) { console.log(e); } delete peerTunnel.ws1; } if (peerTunnel.ws2 != null) { try { peerTunnel.ws2.close(); peerTunnel.parent.parent.debug('peer', 'FTunnel2: Soft disconnect '); } catch (e) { console.log(e); } delete peerTunnel.ws2; } } }; return peerTunnel; }; setTimeout(function () { obj.ConnectToPeers(); }, 1000); // Delay this a little to make sure we are ready on our side. return obj; };