/** * @description MeshCentral connection relay module * @author Ylian Saint-Hilaire * @copyright Intel Corporation 2018-2021 * @license Apache-2.0 * @version v0.0.1 */ /*jslint node: true */ /*jshint node: true */ /*jshint strict:false */ /*jshint -W097 */ /*jshint esversion: 6 */ "use strict"; // Mesh Rights const MESHRIGHT_EDITMESH = 0x00000001; const MESHRIGHT_MANAGEUSERS = 0x00000002; const MESHRIGHT_MANAGECOMPUTERS = 0x00000004; const MESHRIGHT_REMOTECONTROL = 0x00000008; const MESHRIGHT_AGENTCONSOLE = 0x00000010; const MESHRIGHT_SERVERFILES = 0x00000020; const MESHRIGHT_WAKEDEVICE = 0x00000040; const MESHRIGHT_SETNOTES = 0x00000080; const MESHRIGHT_REMOTEVIEWONLY = 0x00000100; const MESHRIGHT_NOTERMINAL = 0x00000200; const MESHRIGHT_NOFILES = 0x00000400; const MESHRIGHT_NOAMT = 0x00000800; const MESHRIGHT_DESKLIMITEDINPUT = 0x00001000; const MESHRIGHT_LIMITEVENTS = 0x00002000; const MESHRIGHT_CHATNOTIFY = 0x00004000; const MESHRIGHT_UNINSTALL = 0x00008000; const MESHRIGHT_NODESKTOP = 0x00010000; const MESHRIGHT_REMOTECOMMAND = 0x00020000; const MESHRIGHT_RESETOFF = 0x00040000; const MESHRIGHT_GUESTSHARING = 0x00080000; const MESHRIGHT_ADMIN = 0xFFFFFFFF; function checkDeviceSharePublicIdentifier(parent, domain, nodeid, pid, func) { // Check the public id parent.db.GetAllTypeNodeFiltered([nodeid], domain.id, 'deviceshare', null, function (err, docs) { if ((err != null) || (docs.length == 0)) { func(false); return; } // Search for the device share public identifier var found = false; for (var i = 0; i < docs.length; i++) { if (docs[i].publicid == pid) { found = true; } } func(found); }); } module.exports.CreateMeshRelay = function (parent, ws, req, domain, user, cookie) { if ((cookie != null) && (typeof cookie.nid == 'string') && (typeof cookie.pid == 'string')) { checkDeviceSharePublicIdentifier(parent, domain, cookie.nid, cookie.pid, function (result) { // If the identifier if not found, close the connection if (result == false) { try { ws.close(); } catch (e) { } return; } // Public device sharing identifier found, continue as normal. CreateMeshRelayEx(parent, ws, req, domain, user, cookie); }); } else { CreateMeshRelayEx(parent, ws, req, domain, user, cookie); } } function CreateMeshRelayEx(parent, ws, req, domain, user, cookie) { const currentTime = Date.now(); if (cookie) { if ((typeof cookie.expire == 'number') && (cookie.expire <= currentTime)) { try { ws.close(); parent.parent.debug('relay', 'Relay: Expires cookie (' + req.clientIp + ')'); } catch (e) { console.log(e); } return; } if (typeof cookie.nid == 'string') { req.query.nodeid = cookie.nid; } } var obj = {}; obj.ws = ws; obj.id = req.query.id; obj.user = user; obj.ruserid = null; obj.req = req; // Used in multi-server.js // Setup subscription for desktop sharing public identifier // If the identifier is removed, drop the connection if ((cookie != null) && (typeof cookie.pid == 'string')) { obj.pid = cookie.pid; parent.parent.AddEventDispatch([cookie.nid], obj); obj.HandleEvent = function (source, event, ids, id) { if ((event.action == 'removedDeviceShare') && (obj.pid == event.publicid)) { closeBothSides(); } } } // Check relay authentication if ((user == null) && (obj.req.query != null) && (obj.req.query.rauth != null)) { const rcookie = parent.parent.decodeCookie(obj.req.query.rauth, parent.parent.loginCookieEncryptionKey, 240); // Cookie with 4 hour timeout if (rcookie.ruserid != null) { obj.ruserid = rcookie.ruserid; } } // If there is no authentication, drop this connection if ((obj.id != null) && (obj.id.startsWith('meshmessenger/') == false) && (obj.user == null) && (obj.ruserid == null)) { try { ws.close(); parent.parent.debug('relay', 'Relay: Connection with no authentication (' + obj.req.clientIp + ')'); } catch (e) { console.log(e); } return; } // Relay session count (we may remove this in the future) obj.relaySessionCounted = true; parent.relaySessionCount++; // Setup slow relay is requested. This will show down sending any data to this peer. if ((req.query.slowrelay != null)) { var sr = null; try { sr = parseInt(req.query.slowrelay); } catch (ex) { } if ((typeof sr == 'number') && (sr > 0) && (sr < 1000)) { obj.ws.slowRelay = sr; } } // Mesh Rights const MESHRIGHT_EDITMESH = 1; const MESHRIGHT_MANAGEUSERS = 2; const MESHRIGHT_MANAGECOMPUTERS = 4; const MESHRIGHT_REMOTECONTROL = 8; const MESHRIGHT_AGENTCONSOLE = 16; const MESHRIGHT_SERVERFILES = 32; const MESHRIGHT_WAKEDEVICE = 64; const MESHRIGHT_SETNOTES = 128; const MESHRIGHT_REMOTEVIEW = 256; // Site rights const SITERIGHT_SERVERBACKUP = 1; const SITERIGHT_MANAGEUSERS = 2; const SITERIGHT_SERVERRESTORE = 4; const SITERIGHT_FILEACCESS = 8; const SITERIGHT_SERVERUPDATE = 16; const SITERIGHT_LOCKED = 32; // Clean a IPv6 address that encodes a IPv4 address function cleanRemoteAddr(addr) { if (addr.startsWith('::ffff:')) { return addr.substring(7); } else { return addr; } } // Disconnect this agent obj.close = function (arg) { if ((arg == 1) || (arg == null)) { try { ws.close(); parent.parent.debug('relay', 'Relay: Soft disconnect (' + obj.req.clientIp + ')'); } catch (e) { console.log(e); } } // Soft close, close the websocket if (arg == 2) { try { ws._socket._parent.end(); parent.parent.debug('relay', 'Relay: Hard disconnect (' + obj.req.clientIp + ')'); } catch (e) { console.log(e); } } // Hard close, close the TCP socket // Aggressive cleanup delete obj.id; delete obj.ws; delete obj.peer; delete obj.expireTimer; // Unsubscribe if (obj.pid != null) { parent.parent.RemoveAllEventDispatch(obj); } }; obj.sendAgentMessage = function (command, userid, domainid) { var rights, mesh; if (command.nodeid == null) return false; var user = parent.users[userid]; if (user == null) return false; var splitnodeid = command.nodeid.split('/'); // Check that we are in the same domain and the user has rights over this node. if ((splitnodeid[0] == 'node') && (splitnodeid[1] == domainid)) { // Get the user object // See if the node is connected var agent = parent.wsagents[command.nodeid]; if (agent != null) { // Check if we have permission to send a message to that node rights = parent.GetNodeRights(user, agent.dbMeshKey, agent.dbNodeKey); mesh = parent.meshes[agent.dbMeshKey]; if ((rights != null) && (mesh != null) || ((rights & MESHRIGHT_REMOTECONTROL) != 0)) { if (ws.sessionId) { command.sessionid = ws.sessionId; } // Set the session id, required for responses. command.rights = rights; // Add user rights flags to the message if (typeof command.consent == 'number') { command.consent = command.consent | mesh.consent; } else { command.consent = mesh.consent; } // Add user consent if (typeof domain.userconsentflags == 'number') { command.consent |= domain.userconsentflags; } // Add server required consent flags command.username = user.name; // Add user name command.realname = user.realname; // Add real name if (typeof domain.desktopprivacybartext == 'string') { command.privacybartext = domain.desktopprivacybartext; } // Privacy bar text delete command.nodeid; // Remove the nodeid since it's implyed. agent.send(JSON.stringify(command)); return true; } } else { // Check if a peer server is connected to this agent var routing = parent.parent.GetRoutingServerIdNotSelf(command.nodeid, 1); // 1 = MeshAgent routing type if (routing != null) { // Check if we have permission to send a message to that node rights = parent.GetNodeRights(user, routing.meshid, command.nodeid); mesh = parent.meshes[routing.meshid]; if (rights != null || ((rights & MESHRIGHT_REMOTECONTROL) != 0)) { if (ws.sessionId) { command.fromSessionid = ws.sessionId; } // Set the session id, required for responses. command.rights = rights; // Add user rights flags to the message if (typeof command.consent == 'number') { command.consent = command.consent | mesh.consent; } else { command.consent = mesh.consent; } // Add user consent if (typeof domain.userconsentflags == 'number') { command.consent |= domain.userconsentflags; } // Add server required consent flags command.username = user.name; // Add user name command.realname = user.realname; // Add real name if (typeof domain.desktopprivacybartext == 'string') { command.privacybartext = domain.desktopprivacybartext; } // Privacy bar text parent.parent.multiServer.DispatchMessageSingleServer(command, routing.serverid); return true; } } } } return false; } // Push any stored message to the peer obj.pushStoredMessages = function () { if ((obj.storedPushedMessages != null) && (obj.peer != null)) { for (var i in obj.storedPushedMessages) { try { obj.peer.ws.send(JSON.stringify({ action: 'chat', msg: obj.storedPushedMessages[i] })); } catch (ex) { console.log(ex); } } } } // Push any stored message to the peer obj.sendPeerImage = function () { if ((typeof obj.id == 'string') && obj.id.startsWith('meshmessenger/') && (obj.peer != null) && (obj.user != null) && (typeof obj.user.flags == 'number') && (obj.user.flags & 1)) { parent.db.Get('im' + obj.user._id, function (err, docs) { if ((err == null) && (docs != null) && (docs.length == 1) && (typeof docs[0].image == 'string')) { try { obj.peer.ws.send(JSON.stringify({ ctrlChannel: '102938', type: 'image', image: docs[0].image })); } catch (ex) { } } }); } } // Send a PING/PONG message function sendPing() { try { obj.ws.send('{"ctrlChannel":"102938","type":"ping"}'); } catch (ex) { } try { if (obj.peer != null) { obj.peer.ws.send('{"ctrlChannel":"102938","type":"ping"}'); } } catch (ex) { } } function sendPong() { try { obj.ws.send('{"ctrlChannel":"102938","type":"pong"}'); } catch (ex) { } try { if (obj.peer != null) { obj.peer.ws.send('{"ctrlChannel":"102938","type":"pong"}'); } } catch (ex) { } } function performRelay() { if (obj.id == null) { try { obj.close(); } catch (e) { } return null; } // Attempt to connect without id, drop this. ws._socket.setKeepAlive(true, 240000); // Set TCP keep alive // If this is a MeshMessenger session, the ID is the two userid's and authentication must match one of them. if (obj.id.startsWith('meshmessenger/')) { if ((obj.id.startsWith('meshmessenger/user/') == true) && (user == null)) { try { obj.close(); } catch (e) { } return null; } // If user-to-user, both sides need to be authenticated. var x = obj.id.split('/'), user1 = x[1] + '/' + x[2] + '/' + x[3], user2 = x[4] + '/' + x[5] + '/' + x[6]; if ((x[1] != 'user') && (x[4] != 'user')) { try { obj.close(); } catch (e) { } return null; } // MeshMessenger session must have at least one authenticated user if ((x[1] == 'user') && (x[4] == 'user')) { // If this is a user-to-user session, you must be authenticated to join. if ((user._id != user1) && (user._id != user2)) { try { obj.close(); } catch (e) { } return null; } } else { // If only one side of the session is a user // !!!!! TODO: Need to make sure that one of the two sides is the correct user. !!!!! } } // Validate that the id is valid, we only need to do this on non-authenticated sessions. // TODO: Figure out when this needs to be done. /* if (!parent.args.notls) { // Check the identifier, if running without TLS, skip this. var ids = obj.id.split(':'); if (ids.length != 3) { ws.close(); delete obj.id; return null; } // Invalid ID, drop this. if (parent.crypto.createHmac('SHA384', parent.relayRandom).update(ids[0] + ':' + ids[1]).digest('hex') != ids[2]) { ws.close(); delete obj.id; return null; } // Invalid HMAC, drop this. if ((Date.now() - parseInt(ids[1])) > 120000) { ws.close(); delete obj.id; return null; } // Expired time, drop this. obj.id = ids[0]; } */ // Check the peer connection status { var relayinfo = parent.wsrelays[obj.id]; if (relayinfo) { if (relayinfo.state == 1) { // Check that at least one connection is authenticated if ((obj.authenticated != true) && (relayinfo.peer1.authenticated != true)) { ws.close(); parent.parent.debug('relay', 'Relay without-auth: ' + obj.id + ' (' + obj.req.clientIp + ')'); delete obj.id; delete obj.ws; delete obj.peer; return null; } // Check that both connection are for the same user if (!obj.id.startsWith('meshmessenger/')) { var u1 = obj.user ? obj.user._id : obj.ruserid; var u2 = relayinfo.peer1.user ? relayinfo.peer1.user._id : relayinfo.peer1.ruserid; if (parent.args.user != null) { // If the server is setup with a default user, correct the userid now. if (u1 != null) { u1 = 'user/' + domain.id + '/' + parent.args.user.toLowerCase(); } if (u2 != null) { u2 = 'user/' + domain.id + '/' + parent.args.user.toLowerCase(); } } if (u1 != u2) { ws.close(); parent.parent.debug('relay', 'Relay auth mismatch (' + u1 + ' != ' + u2 + '): ' + obj.id + ' (' + obj.req.clientIp + ')'); delete obj.id; delete obj.ws; delete obj.peer; return null; } } // Connect to peer obj.peer = relayinfo.peer1; obj.peer.peer = obj; relayinfo.peer2 = obj; relayinfo.state = 2; relayinfo.peer1.ws._socket.resume(); // Release the traffic relayinfo.peer2.ws._socket.resume(); // Release the traffic ws.time = relayinfo.peer1.ws.time = Date.now(); relayinfo.peer1.ws.peer = relayinfo.peer2.ws; relayinfo.peer2.ws.peer = relayinfo.peer1.ws; // Remove the timeout if (relayinfo.timeout) { clearTimeout(relayinfo.timeout); delete relayinfo.timeout; } // Setup the agent PING/PONG timers unless requested not to if ((obj.req.query.noping != 1) && (obj.peer.req != null) && (obj.peer.req.query != null) && (obj.peer.req.query.noping != 1)) { if ((typeof parent.parent.args.agentping == 'number') && (obj.pingtimer == null)) { obj.pingtimer = setInterval(sendPing, parent.parent.args.agentping * 1000); } else if ((typeof parent.parent.args.agentpong == 'number') && (obj.pongtimer == null)) { obj.pongtimer = setInterval(sendPong, parent.parent.args.agentpong * 1000); } } // Setup session recording var sessionUser = obj.user; if (sessionUser == null) { sessionUser = obj.peer.user; } // If this is a MeshMessenger session, set the protocol to 200. var xtextSession = 0; var recordSession = false; if ((obj.id.startsWith('meshmessenger/node/') == true) && (sessionUser != null) && (domain.sessionrecording == true || ((typeof domain.sessionrecording == 'object') && ((domain.sessionrecording.protocols == null) || (domain.sessionrecording.protocols.indexOf(parseInt(200)) >= 0))))) { var split = obj.id.split('/'); obj.req.query.nodeid = split[1] + '/' + split[2] + '/' + split[3]; recordSession = true; xtextSession = 2; // 1 = Raw recording of all strings, 2 = Record chat session messages only. } if ((obj.req.query.p != null) && (obj.req.query.nodeid != null) && (sessionUser != null) && (domain.sessionrecording == true || ((typeof domain.sessionrecording == 'object') && ((domain.sessionrecording.protocols == null) || (domain.sessionrecording.protocols.indexOf(parseInt(obj.req.query.p)) >= 0))))) { recordSession = true; } if (recordSession) { // Get the computer name parent.db.Get(obj.req.query.nodeid, function (err, nodes) { var xusername = '', xdevicename = '', xdevicename2 = null, node = null; if ((nodes != null) && (nodes.length == 1)) { node = nodes[0]; xdevicename2 = node.name; xdevicename = '-' + parent.common.makeFilename(node.name); } // Check again if we need to do recording if ((node == null) || (domain.sessionrecording.onlyselecteddevicegroups === true)) { var mesh = null; if (node != null) { mesh = parent.meshes[node.meshid]; } if ((node == null) || (mesh == null) || (mesh.flags == null) || ((mesh.flags & 4) == 0)) { // Do not record the session, just send session start try { ws.send('c'); } catch (ex) { } // Send connect to both peers try { relayinfo.peer1.ws.send('c'); } catch (ex) { } // Send any stored push messages obj.pushStoredMessages(); relayinfo.peer1.pushStoredMessages(); // Send other peer's image obj.sendPeerImage(); relayinfo.peer1.sendPeerImage(); return; } } // Get the username and make it acceptable as a filename if (sessionUser._id) { xusername = '-' + parent.common.makeFilename(sessionUser._id.split('/')[2]); } var now = new Date(Date.now()); var xsessionid = obj.id; if ((typeof xsessionid == 'string') && (xsessionid.startsWith('meshmessenger/node/') == true)) { xsessionid = 'Messenger' } var recFilename = 'relaysession' + ((domain.id == '') ? '' : '-') + domain.id + '-' + now.getUTCFullYear() + '-' + parent.common.zeroPad(now.getUTCMonth(), 2) + '-' + parent.common.zeroPad(now.getUTCDate(), 2) + '-' + parent.common.zeroPad(now.getUTCHours(), 2) + '-' + parent.common.zeroPad(now.getUTCMinutes(), 2) + '-' + parent.common.zeroPad(now.getUTCSeconds(), 2) + xusername + xdevicename + '-' + xsessionid + (xtextSession ? '.txt' : '.mcrec'); var recFullFilename = null; if (domain.sessionrecording.filepath) { try { parent.parent.fs.mkdirSync(domain.sessionrecording.filepath); } catch (e) { } recFullFilename = parent.parent.path.join(domain.sessionrecording.filepath, recFilename); } else { try { parent.parent.fs.mkdirSync(parent.parent.recordpath); } catch (e) { } recFullFilename = parent.parent.path.join(parent.parent.recordpath, recFilename); } parent.parent.fs.open(recFullFilename, 'w', function (err, fd) { if (err != null) { // Unable to record parent.parent.debug('relay', 'Relay: Unable to record to file: ' + recFullFilename); try { ws.send('c'); } catch (ex) { } // Send connect to both peers try { relayinfo.peer1.ws.send('c'); } catch (ex) { } // Send any stored push messages obj.pushStoredMessages(); relayinfo.peer1.pushStoredMessages(); // Send other peer's image obj.sendPeerImage(); relayinfo.peer1.sendPeerImage(); } else { // Write the recording file header parent.parent.debug('relay', 'Relay: Started recoding to file: ' + recFullFilename); var metadata = { magic: 'MeshCentralRelaySession', ver: 1, userid: sessionUser._id, username: sessionUser.name, sessionid: obj.id, ipaddr1: (obj.req == null) ? null : obj.req.clientIp, ipaddr2: ((obj.peer == null) || (obj.peer.req == null)) ? null : obj.peer.req.clientIp, time: new Date().toLocaleString(), protocol: (((obj.req == null) || (obj.req.query == null)) ? null : obj.req.query.p), nodeid: (((obj.req == null) || (obj.req.query == null)) ? null : obj.req.query.nodeid) }; if (xdevicename2 != null) { metadata.devicename = xdevicename2; } var firstBlock = JSON.stringify(metadata); var logfile = { fd: fd, lock: false, filename: recFullFilename, startTime: Date.now(), size: 0, text: xtextSession }; if (node != null) { logfile.nodeid = node._id; logfile.meshid = node.meshid; logfile.name = node.name; logfile.icon = node.icon; } recordingEntry(logfile, 1, 0, firstBlock, function () { try { relayinfo.peer1.ws.logfile = ws.logfile = logfile; } catch (ex) { try { ws.send('c'); } catch (ex) { } // Send connect to both peers, 'cr' indicates the session is being recorded. try { relayinfo.peer1.ws.send('c'); } catch (ex) { } // Send any stored push messages obj.pushStoredMessages(); relayinfo.peer1.pushStoredMessages(); // Send other peer's image obj.sendPeerImage(); relayinfo.peer1.sendPeerImage(); return; } try { ws.send('cr'); } catch (ex) { } // Send connect to both peers, 'cr' indicates the session is being recorded. try { relayinfo.peer1.ws.send('cr'); } catch (ex) { } // Send any stored push messages obj.pushStoredMessages(); relayinfo.peer1.pushStoredMessages(); // Send other peer's image obj.sendPeerImage(); relayinfo.peer1.sendPeerImage(); }); } }); }); } else { // Send session start try { ws.send('c'); } catch (ex) { } // Send connect to both peers try { relayinfo.peer1.ws.send('c'); } catch (ex) { } // Send any stored push messages obj.pushStoredMessages(); relayinfo.peer1.pushStoredMessages(); // Send other peer's image obj.sendPeerImage(); relayinfo.peer1.sendPeerImage(); } parent.parent.debug('relay', 'Relay connected: ' + obj.id + ' (' + obj.req.clientIp + ' --> ' + obj.peer.req.clientIp + ')'); // Log the connection if (sessionUser != null) { var msg = 'Started relay session', msgid = 13; if (obj.req.query.p == 1) { msg = 'Started terminal session'; msgid = 14; } else if (obj.req.query.p == 2) { msg = 'Started desktop session'; msgid = 15; } else if (obj.req.query.p == 5) { msg = 'Started file management session'; msgid = 16; } var event = { etype: 'relay', action: 'relaylog', domain: domain.id, userid: sessionUser._id, username: sessionUser.name, msgid: msgid, msgArgs: [obj.id, obj.peer.req.clientIp, req.clientIp], msg: msg + ' \"' + obj.id + '\" from ' + obj.peer.req.clientIp + ' to ' + req.clientIp, protocol: req.query.p, nodeid: req.query.nodeid }; parent.parent.DispatchEvent(['*', sessionUser._id], obj, event); } } else { // Connected already, drop (TODO: maybe we should re-connect?) ws.close(); parent.parent.debug('relay', 'Relay duplicate: ' + obj.id + ' (' + obj.req.clientIp + ')'); delete obj.id; delete obj.ws; delete obj.peer; return null; } } else { // Set authenticated side as browser side for messenger sessions if ((obj.id.startsWith('meshmessenger/node/') == true) && obj.authenticated) { obj.req.query.browser = 1; } // Wait for other relay connection if ((obj.id.startsWith('meshmessenger/node/') == true) && obj.authenticated && (parent.parent.firebase != null)) { // This is an authenticated messenger session, push messaging may be allowed. Don't hold traffic. ws._socket.resume(); // Don't hold traffic, process push messages parent.parent.debug('relay', 'Relay messenger waiting: ' + obj.id + ' (' + obj.req.clientIp + ') ' + (obj.authenticated ? 'Authenticated' : '')); // Fetch the Push Messaging Token const idsplit = obj.id.split('/'); const nodeid = idsplit[1] + '/' + idsplit[2] + '/' + idsplit[3]; parent.db.Get(nodeid, function (err, nodes) { if ((err == null) && (nodes != null) && (nodes.length == 1) && (typeof nodes[0].pmt == 'string')) { if ((parent.GetNodeRights(obj.user, nodes[0].meshid, nodes[0]._id) & MESHRIGHT_CHATNOTIFY) != 0) { obj.node = nodes[0]; // Create the peer connection URL, we will include that in push messages obj.msgurl = req.headers.origin + (req.url.split('/.websocket')[0].split('/meshrelay.ashx').join('/messenger')) + '?id=' + req.query.id } } }); parent.wsrelays[obj.id] = { peer1: obj, state: 1 }; // No timeout on connections with push notification. } else { ws._socket.pause(); // Hold traffic until the other connection parent.parent.debug('relay', 'Relay holding: ' + obj.id + ' (' + obj.req.clientIp + ') ' + (obj.authenticated ? 'Authenticated' : '')); parent.wsrelays[obj.id] = { peer1: obj, state: 1, timeout: setTimeout(closeBothSides, 60000) }; } // Check if a peer server has this connection if (parent.parent.multiServer != null) { var rsession = parent.wsPeerRelays[obj.id]; if ((rsession != null) && (rsession.serverId > parent.parent.serverId)) { // We must initiate the connection to the peer parent.parent.multiServer.createPeerRelay(ws, req, rsession.serverId, obj.req.session.userid); delete parent.wsrelays[obj.id]; } else { // Send message to other peers that we have this connection parent.parent.multiServer.DispatchMessage(JSON.stringify({ action: 'relay', id: obj.id })); } } } } } ws.flushSink = function () { try { ws._socket.resume(); } catch (ex) { console.log(ex); } }; // When data is received from the mesh relay web socket ws.on('message', function (data) { if (this.peer != null) { //if (typeof data == 'string') { console.log('Relay: ' + data); } else { console.log('Relay:' + data.length + ' byte(s)'); } if (this.peer.slowRelay == null) { try { this._socket.pause(); if (this.logfile != null) { // Write data to log file then perform relay var xthis = this; recordingEntry(this.logfile, 2, ((obj.req.query.browser) ? 2 : 0), data, function () { xthis.peer.send(data, ws.flushSink); }); } else { // Perform relay this.peer.send(data, ws.flushSink); } } catch (ex) { console.log(ex); } } else { try { this._socket.pause(); if (this.logfile != null) { // Write data to log file then perform slow relay var xthis = this; recordingEntry(this.logfile, 2, ((obj.req.query.browser) ? 2 : 0), data, function () { setTimeout(function () { xthis.peer.send(data, ws.flushSink); }, xthis.peer.slowRelay); }); } else { // Perform slow relay var xthis = this; setTimeout(function () { xthis.peer.send(data, ws.flushSink); }, xthis.peer.slowRelay); } } catch (ex) { console.log(ex); } } } else { if ((typeof data == 'string') && (obj.node != null) && (obj.node.pmt != null)) { var command = null; try { command = JSON.parse(data); } catch (ex) { return; } if ((typeof command != 'object') || (command.action != 'chat') || (typeof command.msg != 'string') || (command.msg == '')) return; // Store pushed messages if (obj.storedPushedMessages == null) { obj.storedPushedMessages = []; } obj.storedPushedMessages.push(command.msg); while (obj.storedPushedMessages.length > 50) { obj.storedPushedMessages.shift(); } // Only keep last 50 notifications // Send out a push message to the device command.title = (domain.title ? domain.title : 'MeshCentral'); var payload = { notification: { title: command.title, body: command.msg }, data: { url: obj.msgurl } }; var options = { priority: 'High', timeToLive: 5 * 60 }; // TTL: 5 minutes, priority 'Normal' or 'High' parent.parent.firebase.sendToDevice(obj.node, payload, options, function (id, err, errdesc) { if (err == null) { parent.parent.debug('email', 'Successfully send push message to device ' + obj.node.name + ', title: ' + command.title + ', msg: ' + command.msg); try { ws.send(JSON.stringify({ action: 'ctrl', value: 1 })); } catch (ex) { } // Push notification success } else { parent.parent.debug('email', 'Failed to send push message to device ' + obj.node.name + ', title: ' + command.title + ', msg: ' + command.msg + ', error: ' + errdesc); try { ws.send(JSON.stringify({ action: 'ctrl', value: 2 })); } catch (ex) { } // Push notification failed } }); } } }); // If error, close both sides of the relay. ws.on('error', function (err) { parent.relaySessionErrorCount++; if (obj.relaySessionCounted) { parent.relaySessionCount--; delete obj.relaySessionCounted; } console.log('Relay error from ' + obj.req.clientIp + ', ' + err.toString().split('\r')[0] + '.'); closeBothSides(); }); // If the relay web socket is closed, close both sides. ws.on('close', function (req) { if (obj.relaySessionCounted) { parent.relaySessionCount--; delete obj.relaySessionCounted; } closeBothSides(); }); // Close both our side and the peer side. function closeBothSides() { if (obj.id != null) { var relayinfo = parent.wsrelays[obj.id]; if (relayinfo != null) { if (relayinfo.state == 2) { var peer = (relayinfo.peer1 == obj) ? relayinfo.peer2 : relayinfo.peer1; // Disconnect the peer try { if (peer.relaySessionCounted) { parent.relaySessionCount--; delete peer.relaySessionCounted; } } catch (ex) { console.log(ex); } parent.parent.debug('relay', 'Relay disconnect: ' + obj.id + ' (' + obj.req.clientIp + ' --> ' + peer.req.clientIp + ')'); try { peer.ws.close(); } catch (e) { } // Soft disconnect try { peer.ws._socket._parent.end(); } catch (e) { } // Hard disconnect // Log the disconnection if (ws.time) { var msg = 'Ended relay session', msgid = 9; if (obj.req.query.p == 1) { msg = 'Ended terminal session', msgid = 10; } else if (obj.req.query.p == 2) { msg = 'Ended desktop session', msgid = 11; } else if (obj.req.query.p == 5) { msg = 'Ended file management session', msgid = 12; } else if (obj.req.query.p == 200) { msg = 'Ended messenger session', msgid = 112; } if (user) { var event = { etype: 'relay', action: 'relaylog', domain: domain.id, userid: user._id, username: user.name, msgid: msgid, msgArgs: [obj.id, obj.req.clientIp, obj.peer.req.clientIp, Math.floor((Date.now() - ws.time) / 1000)], msg: msg + ' \"' + obj.id + '\" from ' + obj.req.clientIp + ' to ' + obj.peer.req.clientIp + ', ' + Math.floor((Date.now() - ws.time) / 1000) + ' second(s)', protocol: obj.req.query.p, nodeid: obj.req.query.nodeid }; parent.parent.DispatchEvent(['*', user._id], obj, event); } else if (peer.user) { var event = { etype: 'relay', action: 'relaylog', domain: domain.id, userid: peer.user._id, username: peer.user.name, msgid: msgid, msgArgs: [obj.id, obj.req.clientIp, obj.peer.req.clientIp, Math.floor((Date.now() - ws.time) / 1000)], msg: msg + ' \"' + obj.id + '\" from ' + obj.req.clientIp + ' to ' + obj.peer.req.clientIp + ', ' + Math.floor((Date.now() - ws.time) / 1000) + ' second(s)', protocol: obj.req.query.p, nodeid: obj.req.query.nodeid }; parent.parent.DispatchEvent(['*', peer.user._id], obj, event); } } // Aggressive peer cleanup delete peer.id; delete peer.ws; delete peer.peer; if (peer.pingtimer != null) { clearInterval(peer.pingtimer); delete peer.pingtimer; } if (peer.pongtimer != null) { clearInterval(peer.pongtimer); delete peer.pongtimer; } } else { parent.parent.debug('relay', 'Relay disconnect: ' + obj.id + ' (' + obj.req.clientIp + ')'); } // Close the recording file if needed if (ws.logfile != null) { var logfile = ws.logfile; delete ws.logfile; if (peer.ws) { delete peer.ws.logfile; } recordingEntry(logfile, 3, 0, 'MeshCentralMCREC', function (logfile, tag) { parent.parent.fs.close(logfile.fd); // Now that the recording file is closed, check if we need to index this file. if (domain.sessionrecording.index !== false) { parent.parent.certificateOperations.acceleratorPerformOperation('indexMcRec', tag.logfile.filename); } // Compute session length var sessionLength = null; if (tag.logfile.startTime != null) { sessionLength = Math.round((Date.now() - tag.logfile.startTime) / 1000); } // Add a event entry about this recording var basefile = parent.parent.path.basename(tag.logfile.filename); var event = { etype: 'relay', action: 'recording', domain: domain.id, nodeid: tag.logfile.nodeid, msg: "Finished recording session" + (sessionLength ? (', ' + sessionLength + ' second(s)') : ''), filename: basefile, size: tag.logfile.size }; if (user) { event.userids = [user._id]; } else if (peer.user) { event.userids = [peer.user._id]; } var xprotocol = (((obj.req == null) || (obj.req.query == null)) ? null : obj.req.query.p); if ((xprotocol == null) && (logfile.text == 2)) { xprotocol = 200; } if (xprotocol != null) { event.protocol = parseInt(xprotocol); } var mesh = parent.meshes[tag.logfile.meshid]; if (mesh != null) { event.meshname = mesh.name; event.meshid = mesh._id; } if (tag.logfile.startTime) { event.startTime = tag.logfile.startTime; event.lengthTime = sessionLength; } if (tag.logfile.name) { event.name = tag.logfile.name; } if (tag.logfile.icon) { event.icon = tag.logfile.icon; } parent.parent.DispatchEvent(['*', 'recording', obj.nodeid, obj.meshid], obj, event); cleanUpRecordings(); }, { ws: ws, pws: peer.ws, logfile: logfile }); } try { ws.close(); } catch (ex) { } delete parent.wsrelays[obj.id]; } } // Aggressive cleanup delete obj.id; delete obj.ws; delete obj.peer; if (obj.pingtimer != null) { clearInterval(obj.pingtimer); delete obj.pingtimer; } if (obj.pongtimer != null) { clearInterval(obj.pongtimer); delete obj.pongtimer; } // Unsubscribe if (obj.pid != null) { parent.parent.RemoveAllEventDispatch(obj); } } // Record a new entry in a recording log function recordingEntry(logfile, type, flags, data, func, tag) { try { if (logfile.text) { // Text recording format var out = ''; const utcDate = new Date(Date.now()); if (type == 1) { // End of start out = data + '\r\n' + utcDate.toUTCString() + ', ' + "<<>>" + '\r\n'; } else if (type == 3) { // End of log out = utcDate.toUTCString() + ', ' + "<<>>" + '\r\n'; } else if (typeof data == 'string') { // Log message if (logfile.text == 1) { out = utcDate.toUTCString() + ', ' + data + '\r\n'; } else if (logfile.text == 2) { try { var x = JSON.parse(data); if (typeof x.action == 'string') { if ((x.action == 'chat') && (typeof x.msg == 'string')) { out = utcDate.toUTCString() + ', ' + (((flags & 2) ? '--> ' : '<-- ') + x.msg + '\r\n'); } else if ((x.action == 'file') && (typeof x.name == 'string') && (typeof x.size == 'number')) { out = utcDate.toUTCString() + ', ' + (((flags & 2) ? '--> ' : '<-- ') + "File Transfer" + ', \"' + x.name + '\" (' + x.size + ' ' + "bytes" + ')\r\n'); } } else if (x.ctrlChannel == null) { out = utcDate.toUTCString() + ', ' + data + '\r\n'; } } catch (ex) { out = utcDate.toUTCString() + ', ' + data + '\r\n'; } } } if (out != null) { // Log this event const block = Buffer.from(out); parent.parent.fs.write(logfile.fd, block, 0, block.length, function () { func(logfile, tag); }); logfile.size += block.length; } else { // Skip logging this. func(logfile, tag); } } else { // Binary recording format if (typeof data == 'string') { // String write var blockData = Buffer.from(data), header = Buffer.alloc(16); // Header: Type (2) + Flags (2) + Size(4) + Time(8) header.writeInt16BE(type, 0); // Type (1 = Header, 2 = Network Data) header.writeInt16BE(flags, 2); // Flags (1 = Binary, 2 = User) header.writeInt32BE(blockData.length, 4); // Size header.writeIntBE(new Date(), 10, 6); // Time var block = Buffer.concat([header, blockData]); parent.parent.fs.write(logfile.fd, block, 0, block.length, function () { func(logfile, tag); }); logfile.size += block.length; } else { // Binary write var header = Buffer.alloc(16); // Header: Type (2) + Flags (2) + Size(4) + Time(8) header.writeInt16BE(type, 0); // Type (1 = Header, 2 = Network Data) header.writeInt16BE(flags | 1, 2); // Flags (1 = Binary, 2 = User) header.writeInt32BE(data.length, 4); // Size header.writeIntBE(new Date(), 10, 6); // Time var block = Buffer.concat([header, data]); parent.parent.fs.write(logfile.fd, block, 0, block.length, function () { func(logfile, tag); }); logfile.size += block.length; } } } catch (ex) { console.log(ex); func(logfile, tag); } } // If this session has a expire time, setup the expire timer now. if (cookie && (typeof cookie.expire == 'number')) { obj.expireTimer = setTimeout(closeBothSides, cookie.expire - currentTime); } // Mark this relay session as authenticated if this is the user end. obj.authenticated = (user != null); if (obj.authenticated) { // Kick off the routing, if we have agent routing instructions, process them here. // Routing instructions can only be given by a authenticated user if ((cookie != null) && (cookie.nodeid != null) && (cookie.tcpport != null) && (cookie.domainid != null)) { // We have routing instructions in the cookie, but first, check user access for this node. parent.db.Get(cookie.nodeid, function (err, docs) { if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket const node = docs[0]; // Check if this user has permission to manage this computer if ((parent.GetNodeRights(user, node.meshid, node._id) & MESHRIGHT_REMOTECONTROL) == 0) { console.log('ERR: Access denied (1)'); try { obj.close(); } catch (e) { } return; } // Send connection request to agent const rcookie = parent.parent.encodeCookie({ ruserid: user._id }, parent.parent.loginCookieEncryptionKey); if (obj.id == null) { obj.id = ('' + Math.random()).substring(2); } // If there is no connection id, generate one. const command = { nodeid: cookie.nodeid, action: 'msg', type: 'tunnel', userid: user._id, value: '*/meshrelay.ashx?id=' + obj.id + '&rauth=' + rcookie, tcpport: cookie.tcpport, tcpaddr: cookie.tcpaddr, soptions: {} }; if (typeof domain.consentmessages == 'object') { if (typeof domain.consentmessages.title == 'string') { command.soptions.consentTitle = domain.consentmessages.title; } if (typeof domain.consentmessages.desktop == 'string') { command.soptions.consentMsgDesktop = domain.consentmessages.desktop; } if (typeof domain.consentmessages.terminal == 'string') { command.soptions.consentMsgTerminal = domain.consentmessages.terminal; } if (typeof domain.consentmessages.files == 'string') { command.soptions.consentMsgFiles = domain.consentmessages.files; } } if (typeof domain.notificationmessages == 'object') { if (typeof domain.notificationmessages.title == 'string') { command.soptions.notifyTitle = domain.notificationmessages.title; } if (typeof domain.notificationmessages.desktop == 'string') { command.soptions.notifyMsgDesktop = domain.notificationmessages.desktop; } if (typeof domain.notificationmessages.terminal == 'string') { command.soptions.notifyMsgTerminal = domain.notificationmessages.terminal; } if (typeof domain.notificationmessages.files == 'string') { command.soptions.notifyMsgFiles = domain.notificationmessages.files; } } parent.parent.debug('relay', 'Relay: Sending agent tunnel command: ' + JSON.stringify(command)); if (obj.sendAgentMessage(command, user._id, cookie.domainid) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); } performRelay(); }); return obj; } else if ((obj.req.query.nodeid != null) && ((obj.req.query.tcpport != null) || (obj.req.query.udpport != null))) { // We have routing instructions in the URL arguments, but first, check user access for this node. parent.db.Get(obj.req.query.nodeid, function (err, docs) { if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket const node = docs[0]; // Check if this user has permission to manage this computer if ((parent.GetNodeRights(user, node.meshid, node._id) & MESHRIGHT_REMOTECONTROL) == 0) { console.log('ERR: Access denied (2)'); try { obj.close(); } catch (e) { } return; } // Send connection request to agent if (obj.id == null) { obj.id = ('' + Math.random()).substring(2); } // If there is no connection id, generate one. const rcookie = parent.parent.encodeCookie({ ruserid: user._id }, parent.parent.loginCookieEncryptionKey); if (obj.req.query.tcpport != null) { const command = { nodeid: obj.req.query.nodeid, action: 'msg', type: 'tunnel', userid: user._id, value: '*/meshrelay.ashx?id=' + obj.id + '&rauth=' + rcookie, tcpport: obj.req.query.tcpport, tcpaddr: ((obj.req.query.tcpaddr == null) ? '127.0.0.1' : obj.req.query.tcpaddr), soptions: {} }; if (typeof domain.consentmessages == 'object') { if (typeof domain.consentmessages.title == 'string') { command.soptions.consentTitle = domain.consentmessages.title; } if (typeof domain.consentmessages.desktop == 'string') { command.soptions.consentMsgDesktop = domain.consentmessages.desktop; } if (typeof domain.consentmessages.terminal == 'string') { command.soptions.consentMsgTerminal = domain.consentmessages.terminal; } if (typeof domain.consentmessages.files == 'string') { command.soptions.consentMsgFiles = domain.consentmessages.files; } } if (typeof domain.notificationmessages == 'object') { if (typeof domain.notificationmessages.title == 'string') { command.soptions.notifyTitle = domain.notificationmessages.title; } if (typeof domain.notificationmessages.desktop == 'string') { command.soptions.notifyMsgDesktop = domain.notificationmessages.desktop; } if (typeof domain.notificationmessages.terminal == 'string') { command.soptions.notifyMsgTerminal = domain.notificationmessages.terminal; } if (typeof domain.notificationmessages.files == 'string') { command.soptions.notifyMsgFiles = domain.notificationmessages.files; } } parent.parent.debug('relay', 'Relay: Sending agent TCP tunnel command: ' + JSON.stringify(command)); if (obj.sendAgentMessage(command, user._id, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); } } else if (obj.req.query.udpport != null) { const command = { nodeid: obj.req.query.nodeid, action: 'msg', type: 'tunnel', userid: user._id, value: '*/meshrelay.ashx?id=' + obj.id + '&rauth=' + rcookie, udpport: obj.req.query.udpport, udpaddr: ((obj.req.query.udpaddr == null) ? '127.0.0.1' : obj.req.query.udpaddr), soptions: {} }; if (typeof domain.consentmessages == 'object') { if (typeof domain.consentmessages.title == 'string') { command.soptions.consentTitle = domain.consentmessages.title; } if (typeof domain.consentmessages.desktop == 'string') { command.soptions.consentMsgDesktop = domain.consentmessages.desktop; } if (typeof domain.consentmessages.terminal == 'string') { command.soptions.consentMsgTerminal = domain.consentmessages.terminal; } if (typeof domain.consentmessages.files == 'string') { command.soptions.consentMsgFiles = domain.consentmessages.files; } } if (typeof domain.notificationmessages == 'object') { if (typeof domain.notificationmessages.title == 'string') { command.soptions.notifyTitle = domain.notificationmessages.title; } if (typeof domain.notificationmessages.desktop == 'string') { command.soptions.notifyMsgDesktop = domain.notificationmessages.desktop; } if (typeof domain.notificationmessages.terminal == 'string') { command.soptions.notifyMsgTerminal = domain.notificationmessages.terminal; } if (typeof domain.notificationmessages.files == 'string') { command.soptions.notifyMsgFiles = domain.notificationmessages.files; } } parent.parent.debug('relay', 'Relay: Sending agent UDP tunnel command: ' + JSON.stringify(command)); if (obj.sendAgentMessage(command, user._id, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); } } performRelay(); }); return obj; } else if ((cookie != null) && (cookie.nid != null) && (typeof cookie.r == 'number') && (typeof cookie.p == 'number') && (typeof cookie.cf == 'number') && (typeof cookie.gn == 'string')) { // We have routing instructions in the cookie, but first, check user access for this node. parent.db.Get(cookie.nid, function (err, docs) { if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket const node = docs[0]; // Check if this user has permission to manage this computer if ((parent.GetNodeRights(user, node.meshid, node._id) & MESHRIGHT_REMOTECONTROL) == 0) { console.log('ERR: Access denied (2)'); try { obj.close(); } catch (e) { } return; } // Send connection request to agent if (obj.id == null) { obj.id = ('' + Math.random()).substring(2); } const rcookie = parent.parent.encodeCookie({ ruserid: user._id, nodeid: node._id }, parent.parent.loginCookieEncryptionKey); const command = { nodeid: node._id, action: 'msg', type: 'tunnel', userid: user._id, value: '*/meshrelay.ashx?p=' + cookie.p + '&id=' + obj.id + '&rauth=' + rcookie + '&nodeid=' + node._id, soptions: {}, rights: cookie.r, guestname: cookie.gn, consent: cookie.cf, remoteaddr: cleanRemoteAddr(obj.req.clientIp) }; // Limit what this relay connection can do if (typeof cookie.p == 'number') { var usages = []; if (cookie.p & 1) { usages.push(1); usages.push(6); usages.push(8); usages.push(9); } // Terminal if (cookie.p & 2) { usages.push(2); } // Desktop if (cookie.p & 4) { usages.push(5); usages.push(10); } // Files command.soptions.usages = usages; } if (typeof domain.consentmessages == 'object') { if (typeof domain.consentmessages.title == 'string') { command.soptions.consentTitle = domain.consentmessages.title; } if (typeof domain.consentmessages.desktop == 'string') { command.soptions.consentMsgDesktop = domain.consentmessages.desktop; } if (typeof domain.consentmessages.terminal == 'string') { command.soptions.consentMsgTerminal = domain.consentmessages.terminal; } if (typeof domain.consentmessages.files == 'string') { command.soptions.consentMsgFiles = domain.consentmessages.files; } } if (typeof domain.notificationmessages == 'object') { if (typeof domain.notificationmessages.title == 'string') { command.soptions.notifyTitle = domain.notificationmessages.title; } if (typeof domain.notificationmessages.desktop == 'string') { command.soptions.notifyMsgDesktop = domain.notificationmessages.desktop; } if (typeof domain.notificationmessages.terminal == 'string') { command.soptions.notifyMsgTerminal = domain.notificationmessages.terminal; } if (typeof domain.notificationmessages.files == 'string') { command.soptions.notifyMsgFiles = domain.notificationmessages.files; } } parent.parent.debug('relay', 'Relay: Sending agent tunnel command: ' + JSON.stringify(command)); if (obj.sendAgentMessage(command, user._id, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); } performRelay(0); }); return obj; } } // If there is a recording quota, remove any old recordings if needed function cleanUpRecordings() { if ((parent.cleanUpRecordingsActive !== true) && domain.sessionrecording && ((typeof domain.sessionrecording.maxrecordings == 'number') || (typeof domain.sessionrecording.maxrecordingsizemegabytes == 'number'))) { parent.cleanUpRecordingsActive = true; setTimeout(function () { var recPath = null, fs = require('fs'); if (domain.sessionrecording.filepath) { recPath = domain.sessionrecording.filepath; } else { recPath = parent.parent.recordpath; } fs.readdir(recPath, function (err, files) { if ((err != null) || (files == null)) { delete parent.cleanUpRecordingsActive; return; } var recfiles = []; for (var i in files) { if (files[i].endsWith('.mcrec')) { var j = files[i].indexOf('-'); if (j > 0) { var size = null; try { size = fs.statSync(parent.parent.path.join(recPath, files[i])).size } catch (ex) { } if (size != null) { recfiles.push({ n: files[i], r: files[i].substring(j + 1), s: size }); } } } } recfiles.sort(function (a, b) { if (a.r < b.r) return 1; if (a.r > b.r) return -1; return 0; }); var totalFiles = 0, totalSize = 0; for (var i in recfiles) { var overQuota = false; if ((typeof domain.sessionrecording.maxrecordings == 'number') && (totalFiles >= domain.sessionrecording.maxrecordings)) { overQuota = true; } else if ((typeof domain.sessionrecording.maxrecordingsizemegabytes == 'number') && (totalSize >= (domain.sessionrecording.maxrecordingsizemegabytes * 1048576))) { overQuota = true; } if (overQuota) { fs.unlinkSync(parent.parent.path.join(recPath, recfiles[i].n)); } totalFiles++; totalSize += recfiles[i].s; } delete parent.cleanUpRecordingsActive; }); }, 500); } } // If this is not an authenticated session, or the session does not have routing instructions, just go ahead an connect to existing session. performRelay(); return obj; }; /* Relay session recording required that "SessionRecording":true be set in the domain section of the config.json. Once done, a folder "meshcentral-recordings" will be created next to "meshcentral-data" that will contain all of the recording files with the .mcrec extension. The recording files are binary and contain a set of:
... The header is always 16 bytes long and is encoded like this: TYPE 2 bytes, 1 = Header, 2 = Network Data, 3 = EndBlock FLAGS 2 bytes, 0x0001 = Binary, 0x0002 = User SIZE 4 bytes, Size of the data following this header. TIME 8 bytes, Time this record was written, number of milliseconds since 1 January, 1970 UTC. All values are BigEndian encoded. The first data block is of TYPE 1 and contains a JSON string with information about this recording. It looks something like this: { magic: 'MeshCentralRelaySession', ver: 1, userid: "user\domain\userid", username: "username", sessionid: "RandomValue", ipaddr1: 1.2.3.4, ipaddr2: 1.2.3.5, time: new Date().toLocaleString() } The rest of the data blocks are all network traffic that was relayed thru the server. They are of TYPE 2 and have a given size and timestamp. When looking at network traffic the flags are important: - If traffic has the first (0x0001) flag set, the data is binary otherwise it's a string. - If the traffic has the second (0x0002) flag set, traffic is coming from the user's browser, if not, it's coming from the MeshAgent. */ module.exports.CreateLocalRelay = function (parent, ws, req, domain, user, cookie) { CreateLocalRelayEx(parent, ws, req, domain, user, cookie); } function CreateLocalRelayEx(parent, ws, req, domain, user, cookie) { const net = require('net'); var obj = {}; obj.id = Buffer.from(parent.crypto.randomBytes(9), 'binary').toString('base64'); obj.req = req; obj.ws = ws; obj.user = user; // If there is no authentication, drop this connection if (obj.user == null) { try { ws.close(); parent.parent.debug('relay', 'Relay: Connection with no authentication'); } catch (e) { console.log(e); } return; } // Use cookie values when present if (cookie != null) { if (cookie.nodeid) { req.query.nodeid = cookie.nodeid; } if (cookie.tcpport) { req.query.tcpport = cookie.tcpport; } } // Check for nodeid and tcpport if ((req.query == null) || (req.query.nodeid == null) || (req.query.tcpport == null)) { try { ws.close(); parent.parent.debug('relay', 'Relay: Connection with invalid arguments'); } catch (e) { console.log(e); } return; } const tcpport = parseInt(req.query.tcpport); if ((typeof tcpport != 'number') || (tcpport < 1) || (tcpport > 65535)) { try { ws.close(); parent.parent.debug('relay', 'Relay: Connection with invalid arguments'); } catch (e) { console.log(e); } return; } var nodeidsplit = req.query.nodeid.split('/'); if ((nodeidsplit.length != 3) || (nodeidsplit[0] != 'node') || (nodeidsplit[1] != domain.id) || (nodeidsplit[2].length < 10)) { try { ws.close(); parent.parent.debug('relay', 'Relay: Connection with invalid arguments'); } catch (e) { console.log(e); } return; } obj.nodeid = req.query.nodeid; obj.tcpport = tcpport; // Relay session count (we may remove this in the future) obj.relaySessionCounted = true; parent.relaySessionCount++; // Setup slow relay is requested. This will show down sending any data to this peer. if ((req.query.slowrelay != null)) { var sr = null; try { sr = parseInt(req.query.slowrelay); } catch (ex) { } if ((typeof sr == 'number') && (sr > 0) && (sr < 1000)) { obj.ws.slowRelay = sr; } } // Hold traffic until we connect to the target ws._socket.pause(); // Mesh Rights const MESHRIGHT_EDITMESH = 1; const MESHRIGHT_MANAGEUSERS = 2; const MESHRIGHT_MANAGECOMPUTERS = 4; const MESHRIGHT_REMOTECONTROL = 8; const MESHRIGHT_AGENTCONSOLE = 16; const MESHRIGHT_SERVERFILES = 32; const MESHRIGHT_WAKEDEVICE = 64; const MESHRIGHT_SETNOTES = 128; const MESHRIGHT_REMOTEVIEW = 256; // Site rights const SITERIGHT_SERVERBACKUP = 1; const SITERIGHT_MANAGEUSERS = 2; const SITERIGHT_SERVERRESTORE = 4; const SITERIGHT_FILEACCESS = 8; const SITERIGHT_SERVERUPDATE = 16; const SITERIGHT_LOCKED = 32; // Clean a IPv6 address that encodes a IPv4 address function cleanRemoteAddr(addr) { if (addr.startsWith('::ffff:')) { return addr.substring(7); } else { return addr; } } // Disconnect obj.close = function (arg) { if ((arg == 1) || (arg == null)) { try { ws.close(); parent.parent.debug('relay', 'Relay: Soft disconnect'); } catch (e) { console.log(e); } } // Soft close, close the websocket if (arg == 2) { try { ws._socket._parent.end(); parent.parent.debug('relay', 'Relay: Hard disconnect'); } catch (e) { console.log(e); } } // Hard close, close the TCP socket // Update the relay session count if (obj.relaySessionCounted) { parent.relaySessionCount--; delete obj.relaySessionCounted; } // Log the disconnection if (obj.time) { var event = { etype: 'relay', action: 'relaylog', domain: domain.id, userid: obj.user._id, username: obj.user.name, msgid: 9, msgArgs: [obj.id, obj.req.clientIp, obj.host, Math.floor((Date.now() - obj.time) / 1000)], msg: 'Ended relay session \"' + obj.id + '\" from ' + obj.req.clientIp + ' to ' + obj.host + ', ' + Math.floor((Date.now() - obj.time) / 1000) + ' second(s)', nodeid: obj.req.query.nodeid }; parent.parent.DispatchEvent(['*', user._id], obj, event); } // Aggressive cleanup delete obj.ws; delete obj.req; delete obj.time; delete obj.nodeid; delete obj.meshid; delete obj.tcpport; delete obj.expireTimer; if (obj.client != null) { obj.client.destroy(); delete obj.client; } if (obj.pingtimer != null) { clearInterval(obj.pingtimer); delete obj.pingtimer; } if (obj.pongtimer != null) { clearInterval(obj.pongtimer); delete obj.pongtimer; } // Unsubscribe if (obj.pid != null) { parent.parent.RemoveAllEventDispatch(obj); } }; // Send a PING/PONG message function sendPing() { try { obj.ws.send('{"ctrlChannel":"102938","type":"ping"}'); } catch (ex) { } } function sendPong() { try { obj.ws.send('{"ctrlChannel":"102938","type":"pong"}'); } catch (ex) { } } function performRelay() { ws._socket.setKeepAlive(true, 240000); // Set TCP keep alive // Setup the agent PING/PONG timers unless requested not to if (obj.req.query.noping != 1) { if ((typeof parent.parent.args.agentping == 'number') && (obj.pingtimer == null)) { obj.pingtimer = setInterval(sendPing, parent.parent.args.agentping * 1000); } else if ((typeof parent.parent.args.agentpong == 'number') && (obj.pongtimer == null)) { obj.pongtimer = setInterval(sendPong, parent.parent.args.agentpong * 1000); } } parent.db.Get(obj.nodeid, function (err, docs) { if ((err != null) || (docs == null) || (docs.length != 1)) { try { obj.close(); } catch (e) { } return; } // Disconnect websocket const node = docs[0]; obj.host = node.host; obj.meshid = node.meshid; // Check if this user has permission to manage this computer if ((parent.GetNodeRights(obj.user, node.meshid, node._id) & MESHRIGHT_REMOTECONTROL) == 0) { console.log('ERR: Access denied (2)'); try { obj.close(); } catch (e) { } return; } // Setup TCP client obj.client = new net.Socket(); obj.client.connect(obj.tcpport, node.host, function () { // Log the start of the connection obj.time = Date.now(); var event = { etype: 'relay', action: 'relaylog', domain: domain.id, userid: obj.user._id, username: obj.user.name, msgid: 13, msgArgs: [obj.id, obj.req.clientIp, obj.host], msg: 'Started relay session \"' + obj.id + '\" from ' + obj.req.clientIp + ' to ' + obj.host, nodeid: req.query.nodeid }; parent.parent.DispatchEvent(['*', obj.user._id, obj.meshid, obj.nodeid], obj, event); // Start the session ws.send('c'); ws._socket.resume(); }); obj.client.on('data', function (data) { try { this.pause(); ws.send(data, this.clientResume); } catch (ex) { console.log(ex); } }); // Perform relay obj.client.on('close', function () { obj.close(); }); obj.client.on('error', function (err) { obj.close(); }); obj.client.clientResume = function () { try { obj.client.resume(); } catch (ex) { console.log(ex); } }; }); } ws.flushSink = function () { try { ws._socket.resume(); } catch (ex) { console.log(ex); } }; // When data is received from the mesh relay web socket ws.on('message', function (data) { if (typeof data != 'string') { try { ws._socket.pause(); obj.client.write(data, ws.flushSink); } catch (ex) { } } }); // Perform relay // If error, close both sides of the relay. ws.on('error', function (err) { parent.relaySessionErrorCount++; obj.close(); }); // Relay web socket is closed ws.on('close', function (req) { obj.close(); }); // If this is not an authenticated session, or the session does not have routing instructions, just go ahead an connect to existing session. performRelay(); return obj; };