/** * @description MeshCentral remote desktop multiplexor * @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"; /* --- KVM Commands --- MNG_KVM_NOP = 0, MNG_KVM_KEY = 1, MNG_KVM_MOUSE = 2, MNG_KVM_MOUSE_CURSOR = 88, MNG_KVM_MOUSE_MOVE = 89, MNG_KVM_PICTURE = 3, MNG_KVM_COPY = 4, MNG_KVM_COMPRESSION = 5, MNG_KVM_REFRESH = 6, MNG_KVM_SCREEN = 7, MNG_KVM_PAUSE = 8, MNG_TERMTEXT = 9, MNG_CTRLALTDEL = 10, MNG_KVM_GET_DISPLAYS = 11, MNG_KVM_SET_DISPLAY = 12, MNG_KVM_FRAME_RATE_TIMER = 13, MNG_KVM_INIT_TOUCH = 14, MNG_KVM_TOUCH = 15, MNG_KVM_CONNECTCOUNT = 16, MNG_KVM_MESSAGE = 17, MNG_ECHO = 21, MNG_JUMBO = 27, MNG_GETDIR = 50, MNG_FILEMOVE = 51, MNG_FILEDELETE = 52, MNG_FILECOPY = 53, MNG_FILECREATEDIR = 54, MNG_FILETRANSFER = 55, MNG_FILEUPLOAD = 56, MNG_FILESEARCH = 57, MNG_FILETRANSFER2 = 58, MNG_KVM_DISCONNECT = 59, MNG_GETDIR2 = 60, // Same as MNG_GETDIR but with date/time. MNG_FILEUPLOAD2 = 61, // Used for slot based fast upload. MNG_FILEDELETEREC = 62, // Same as MNG_FILEDELETE but recursive MNG_USERCONSENT = 63, // Used to notify management console of user consent state MNG_DEBUG = 64, // Debug/Logging Message for ILibRemoteLogging MNG_ERROR = 65, MNG_ENCAPSULATE_AGENT_COMMAND = 70, MNG_KVM_DISPLAY_INFO = 82 */ function CreateDesktopMultiplexor(parent, domain, nodeid, func) { var obj = {}; obj.nodeid = nodeid; obj.parent = parent; obj.agent = null; // Reference to the connection object that is the agent. obj.viewers = []; // Array of references to all viewers. obj.viewersOverflowCount = 0; // Number of viewers currently in overflow state. obj.width = 0; // Current width of the display in pixels. obj.height = 0; // Current height of the display in pixels. obj.swidth = 0; // Current width of the display in tiles. obj.sheight = 0; // Current height of the display in tiles. obj.screen = null; // The main screen, (x * y) --> tile index. Indicates this image is covering each tile on the screen. obj.counter = 1; // The main counter, used as index for the obj.images table when now images come in. obj.imagesCount = 0; // Total number of images in the obj.images table. obj.imagesCounters = {}; // Main table of indexes --> tile count, the number of tiles still using this image. obj.images = {}; // Main table of indexes --> image data object. obj.lastScreenSizeCmd = null; // Pointer to the last screen size command from the agent. obj.lastScreenSizeCounter = 0; // Index into the image table of the screen size command, this is generally also the first command. obj.lastConsoleMessage = null; // Last agent console message. obj.firstData = null; // Index in the image table of the first image in the table, generally this points to the display resolution command. obj.lastData = null; // Index in the images table of the last image in the table. obj.lastDisplayInfoData = null; // Pointer to the last display information command from the agent (Number of displays). obj.lastDisplayLocationData = null; // Pointer to the last display location and size command from the agent. obj.desktopPaused = true; // Current desktop pause state, it's true if all viewers are paused. obj.imageType = 1; // Current image type, 1 = JPEG, 2 = PNG, 3 = TIFF, 4 = WebP obj.imageCompression = 50; // Current image compression, this is the highest value of all viewers. obj.imageScaling = 1024; // Current image scaling, this is the highest value of all viewers. obj.imageFrameRate = 50; // Current framerate setting, this is the lowest values of all viewers. obj.protocolOptions = null; // Set to the protocol options of the first viewer that connected. obj.viewerConnected = false; // Set to true if one viewer attempted to connect to the agent. obj.recordingFile = null; // Present if we are recording to file. obj.recordingFileSize = 0; // Current size of the recording file. obj.recordingFileWriting = false; // Set to true is we are in the process if writing to the recording file. obj.startTime = null; // Starting time of the multiplex session. obj.userIds = []; // List of userid's that have intertracted with this session. //obj.autoLock = false; // Automatically lock the remote device once disconnected // Accounting parent.trafficStats.desktopMultiplex.sessions++; // Add an agent or viewer obj.addPeer = function (peer) { if (obj.viewers == null) { parent.parent.debug('relay', 'DesktopRelay: Error, addingPeer on disposed session'); return; } if (peer.req == null) return; // This peer is already disposed, don't add it. if (peer.req.query.browser) { //console.log('addPeer-viewer', obj.nodeid); // Setup the viewer if (obj.viewers.indexOf(peer) >= 0) return true; obj.viewers.push(peer); peer.desktopPaused = true; peer.imageType = 1; peer.imageCompression = 30; peer.imageScaling = 1024; peer.imageFrameRate = 100; peer.lastImageNumberSent = null; peer.dataPtr = obj.firstData; peer.sending = false; peer.overflow = false; peer.sendQueue = []; peer.paused = false; peer.startTime = Date.now(); // Add the user to the userids list if needed if ((peer.user != null) && (obj.userIds.indexOf(peer.user._id) == -1)) { obj.userIds.push(peer.user._id); } // Setup slow relay is requested. This will show down sending any data to this viewer. if ((peer.req.query.slowrelay != null)) { var sr = null; try { sr = parseInt(peer.req.query.slowrelay); } catch (ex) { } if ((typeof sr == 'number') && (sr > 0) && (sr < 1000)) { peer.slowRelay = sr; } } // Check session recording var startRecord = false; if (typeof domain.sessionrecording == 'object') { // Check if this user is set to record all sessions if ((domain.sessionrecording.onlyselectedusers === true) && (peer.user != null) && (peer.user.flags != null) && ((peer.user.flags & 2) != 0)) { startRecord = true; } else if (domain.sessionrecording.onlyselectedusergroups === true) { // Check if there is a usergroup that requires recording of the session var user = null; if (peer.user != null) { user = parent.users[peer.user._id]; } if ((user != null) && (user.links != null) && (user.links[obj.meshid] == null) && (user.links[obj.nodeid] == null)) { // This user does not have a direct link to the device group or device. Find all user groups the would cause the link. for (var i in user.links) { var ugrp = parent.userGroups[i]; if ((ugrp != null) && (typeof ugrp.flags == 'number') && ((ugrp.flags & 2) != 0) && (ugrp.links != null) && ((ugrp.links[obj.meshid] != null) || (ugrp.links[obj.nodeid] != null))) { startRecord = true; } } } } } startRecording(domain, startRecord, function () { // Indicated we are connected obj.sendToViewer(peer, obj.recordingFile ? 'cr' : 'c'); // If the agent sent display information or console message, send it to the viewer if (obj.lastDisplayInfoData != null) { obj.sendToViewer(peer, obj.lastDisplayInfoData); } if (obj.lastDisplayLocationData != null) { obj.sendToViewer(peer, obj.lastDisplayLocationData); } if (obj.lastConsoleMessage != null) { obj.sendToViewer(peer, obj.lastConsoleMessage); } // Log joining the multiplex session if (obj.startTime != null) { var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, userid: peer.user ? peer.user._id : null, username: peer.user.name, msgid: 4, msg: "Joined desktop multiplex session", protocol: 2 }; parent.parent.DispatchEvent(['*', obj.nodeid, peer.user._id, obj.meshid], obj, event); } // Send an updated list of all peers to all viewers obj.sendSessionMetadata(); }); } else { //console.log('addPeer-agent', obj.nodeid); if (obj.agent != null) { parent.parent.debug('relay', 'DesktopRelay: Error, duplicate agent connection'); return false; } // Setup the agent obj.agent = peer; peer.sending = false; peer.overflow = false; peer.sendQueue = []; peer.paused = false; // Indicated we are connected and send connection options and protocol if needed obj.sendToAgent(obj.recordingFile?'cr':'c'); if (obj.viewerConnected == true) { if (obj.protocolOptions != null) { obj.sendToAgent(JSON.stringify(obj.protocolOptions)); } // Send connection options obj.sendToAgent('2'); // Send remote desktop connect } } // Log multiplex session start if ((obj.agent != null) && (obj.viewers.length > 0) && (obj.startTime == null)) { var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, msgid: 6, msg: "Started desktop multiplex session", protocol: 2 }; if (obj.viewers[0].user != null) { event.userid = obj.viewers[0].user._id; event.username = obj.viewers[0].user.name; } const targets = ['*', obj.nodeid, obj.meshid]; if (obj.viewers[0].user != null) { targets.push(obj.viewers[0].user._id); } parent.parent.DispatchEvent(targets, obj, event); obj.startTime = Date.now(); } return true; } // Remove an agent or viewer // Return true if this multiplexor is no longer needed. obj.removePeer = function (peer) { if (obj.viewers == null) return; if (peer == obj.agent) { //console.log('removePeer-agent', obj.nodeid); // Agent has disconnected, disconnect everyone. if (obj.viewers != null) { for (var i in obj.viewers) { obj.viewers[i].close(); } } // Clean up the agent obj.agent = null; dispose(); return true; } else { //console.log('removePeer-viewer', obj.nodeid); // Remove a viewer if (obj.viewers != null) { var i = obj.viewers.indexOf(peer); if (i == -1) return false; obj.viewers.splice(i, 1); } // Resume flow control if this was the peer that was limiting traffic (because it was the fastest one). if (peer.overflow == true) { obj.viewersOverflowCount--; peer.overflow = false; if ((obj.viewersOverflowCount < obj.viewers.length) && (obj.recordingFileWriting == false) && obj.agent && (obj.agent.paused == true)) { obj.agent.paused = false; obj.agent.ws._socket.resume(); } } // Log leaving the multiplex session if (obj.startTime != null) { // Used to check if the agent has connected. If not, don't log this event since the session never really started. // In this code, we want to compute the share of in/out traffic that belongs to this viewer. It includes all of the viewers in/out traffic + all or a portion of the agents in/out traffic. // The agent traffic needs to get divided out between the viewers fairly. For the time that multiple viewers are present, the agent traffic is divided between the viewers. // Compute traffic to and from the browser var inTraffc, outTraffc; try { inTraffc = peer.ws._socket.bytesRead; } catch (ex) { } try { outTraffc = peer.ws._socket.bytesWritten; } catch (ex) { } // Add any previous agent traffic accounting if (peer.agentInTraffic) { inTraffc += peer.agentInTraffic; } if (peer.outTraffc) { inTraffc += peer.agentOutTraffic; } // Compute traffic to and from the agent if (obj.agent != null) { // Get unaccounted bytes from/to the agent var agentInTraffc, agentOutTraffc, agentInTraffc2, agentOutTraffc2; try { agentInTraffc = agentInTraffc2 = obj.agent.ws._socket.bytesRead; } catch (ex) { } try { agentOutTraffc = agentOutTraffc2 = obj.agent.ws._socket.bytesWritten; } catch (ex) { } if (obj.agent.accountedBytesRead) { agentInTraffc -= obj.agent.accountedBytesRead; } if (obj.agent.accountedBytesWritten) { agentOutTraffc -= obj.agent.accountedBytesWritten; } obj.agent.accountedBytesRead = agentInTraffc2; obj.agent.accountedBytesWritten = agentOutTraffc2; // Devide up the agent traffic amoung the viewers var viewerPartIn = Math.floor(agentInTraffc / (obj.viewers.length + 1)); var viewerPartOut = Math.floor(agentOutTraffc / (obj.viewers.length + 1)); // Add the portion to this viewer and all other viewer inTraffc += viewerPartIn; outTraffc += viewerPartOut; for (var i in obj.viewers) { if (obj.viewers[i].agentInTraffic) { obj.viewers[i].agentInTraffic += viewerPartIn; } else { obj.viewers[i].agentInTraffic = viewerPartIn; } if (obj.viewers[i].agentOutTraffic) { obj.viewers[i].agentOutTraffic += viewerPartOut; } else { obj.viewers[i].agentOutTraffic = viewerPartOut; } } } //var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, userid: peer.user._id, username: peer.user.name, msgid: 5, msg: "Left the desktop multiplex session", protocol: 2 }; const sessionSeconds = Math.floor((Date.now() - peer.startTime) / 1000); var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, msgid: 122, msgArgs: [sessionSeconds], msg: "Left the desktop multiplex session after " + sessionSeconds + " second(s).", protocol: 2, bytesin: inTraffc, bytesout: outTraffc }; if (peer.user != null) { event.userid = peer.user._id; event.username = peer.user.name; } if (peer.guestName) { event.guestname = peer.guestName; } const targets = ['*', obj.nodeid, obj.meshid]; if (peer.user != null) { targets.push(peer.user._id); } parent.parent.DispatchEvent(targets, obj, event); } // Aggressive clean up of the viewer delete peer.desktopPaused; delete peer.imageType; delete peer.imageCompression; delete peer.imageScaling; delete peer.imageFrameRate; delete peer.lastImageNumberSent; delete peer.dataPtr; delete peer.sending; delete peer.overflow; delete peer.sendQueue; delete peer.startTime; // If this is the last viewer, disconnect the agent if ((obj.viewers != null) && (obj.viewers.length == 0) && (obj.agent != null)) { obj.agent.close(); dispose(); return true; } // Send an updated list of all peers to all viewers obj.sendSessionMetadata(); } return false; } // Clean up ourselves function dispose() { if (obj.viewers == null) return; //console.log('dispose', obj.nodeid); delete obj.viewers; delete obj.imagesCounters; delete obj.images; // Close the recording file if needed if (obj.recordingFile != null) { // Compute session length if (obj.startTime != null) { obj.sessionStart = obj.startTime; obj.sessionLength = Math.round((Date.now() - obj.startTime) / 1000); } // Write the last record of the recording file var rf = obj.recordingFile; delete obj.recordingFile; recordingEntry(rf.fd, 3, 0, 'MeshCentralMCREC', function (fd, filename) { parent.parent.fs.close(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', filename); } // Add a event entry about this recording var basefile = parent.parent.path.basename(filename); var event = { etype: 'relay', action: 'recording', domain: domain.id, nodeid: obj.nodeid, msgid: 7, msgArgs: [obj.sessionLength], msg: "Finished recording session" + (obj.sessionLength ? (', ' + obj.sessionLength + ' second(s)') : ''), filename: basefile, size: obj.recordingFileSize, protocol: 2, icon: obj.icon, name: obj.name, meshid: obj.meshid, userids: obj.userIds, multiplex: true }; var mesh = parent.meshes[obj.meshid]; if (mesh != null) { event.meshname = mesh.name; } if (obj.sessionStart) { event.startTime = obj.sessionStart; event.lengthTime = obj.sessionLength; } parent.parent.DispatchEvent(['*', 'recording', obj.nodeid, obj.meshid], obj, event); cleanUpRecordings(); }, rf.filename); } // Log end of multiplex session if (obj.startTime != null) { var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, msgid: 8, msgArgs: [Math.floor((Date.now() - obj.startTime) / 1000)], msg: "Closed desktop multiplex session" + ', ' + Math.floor((Date.now() - obj.startTime) / 1000) + ' second(s)', protocol: 2 }; parent.parent.DispatchEvent(['*', obj.nodeid, obj.meshid], obj, event); obj.startTime = null; } // Send an updated list of all peers to all viewers obj.sendSessionMetadata(); parent.parent.debug('relay', 'DesktopRelay: Disposing desktop multiplexor'); } // Send data to the agent or queue it up for sending obj.sendToAgent = function (data) { if ((obj.viewers == null) || (obj.agent == null)) return; //console.log('SendToAgent', data.length); if (obj.agent.sending) { obj.agent.sendQueue.push(data); // Flow control, pause all viewers is the queue is backing up if (obj.agent.sendQueue > 10) { obj.agent.overflow = true; for (var i in obj.viewers) { var v = obj.viewers[i]; if (v.paused == false) { v.paused = true; v.ws._socket.pause(); } } } } else { obj.agent.ws.send(data, sendAgentNext); } } // Send more data to the agent function sendAgentNext() { if ((obj.viewers == null) || (obj.agent == null)) return; if (obj.agent.sendQueue.length > 0) { // Send from the pending send queue obj.agent.ws.send(obj.agent.sendQueue.shift(), sendAgentNext); } else { // Nothing to send obj.agent.sending = false; // Flow control, resume all viewers if (obj.agent.overflow == true) { obj.agent.overflow = false; for (var i in obj.viewers) { var v = obj.viewers[i]; if (v.paused == true) { v.paused = false; v.ws._socket.resume(); } } } } } // Send the list of all users currently vieweing this session to all viewers and servers obj.sendSessionMetadata = function () { var allUsers = {}; if (obj.viewers != null) { for (var i in obj.viewers) { var v = obj.viewers[i]; if ((v.user != null) && (v.user._id != null)) { var id = v.user._id; if (v.guestName) { id += '/guest:' + Buffer.from(v.guestName).toString('base64'); } // If this is a guest connect, add the Base64 guest name. if (allUsers[id] == null) { allUsers[id] = 1; } else { allUsers[id]++; } } } obj.sendToAllViewers(JSON.stringify({ type: 'metadata', 'ctrlChannel': '102938', users: allUsers, startTime: obj.startTime })); } // Update the sessions attached the to agent if (obj.nodeid != null) { const xagent = parent.wsagents[obj.nodeid]; if (xagent != null) { if (xagent.sessions == null) { xagent.sessions = {}; } xagent.sessions.multidesk = allUsers; xagent.updateSessions(); } } } // Send this command to all viewers obj.sendToAllViewers = function (data) { if (obj.viewers == null) return; for (var i in obj.viewers) { obj.sendToViewer(obj.viewers[i], data); } } // Send this command to all viewers obj.sendToAllInputViewers = function (data) { if (obj.viewers == null) return; for (var i in obj.viewers) { if (obj.viewers[i].viewOnly != true) { obj.sendToViewer(obj.viewers[i], data); } } } // Send data to the viewer or queue it up for sending obj.sendToViewer = function (viewer, data) { if ((viewer == null) || (obj.viewers == null)) return; //console.log('SendToViewer', data.length); if (viewer.sending) { viewer.sendQueue.push(data); } else { viewer.sending = true; if (viewer.slowRelay) { setTimeout(function () { try { viewer.ws.send(data, function () { sendViewerNext(viewer); }); } catch (ex) { } }, viewer.slowRelay); } else { try { viewer.ws.send(data, function () { sendViewerNext(viewer); }); } catch (ex) { } } // Flow control, pause the agent if needed checkViewerOverflow(viewer); } } // Check if a viewer is in overflow situation function checkViewerOverflow(viewer) { if ((viewer.overflow == true) || (obj.viewers == null)) return; if ((viewer.sendQueue.length > 5) || ((viewer.dataPtr != null) && (viewer.dataPtr != obj.lastData))) { viewer.overflow = true; obj.viewersOverflowCount++; if ((obj.viewersOverflowCount >= obj.viewers.length) && obj.agent && (obj.agent.paused == false)) { obj.agent.paused = true; obj.agent.ws._socket.pause(); } } } // Check if a viewer is in underflow situation function checkViewerUnderflow(viewer) { if ((viewer.overflow == false) || (obj.viewers == null)) return; if ((viewer.sendQueue.length <= 5) && ((viewer.dataPtr == null) || (viewer.dataPtr == obj.lastData))) { viewer.overflow = false; obj.viewersOverflowCount--; if ((obj.viewersOverflowCount < obj.viewers.length) && (obj.recordingFileWriting == false) && obj.agent && (obj.agent.paused == true)) { obj.agent.paused = false; obj.agent.ws._socket.resume(); } } } // Send more data to the viewer function sendViewerNext(viewer) { if ((viewer.sendQueue == null) || (obj.viewers == null)) return; if (viewer.sendQueue.length > 0) { // Send from the pending send queue if (viewer.sending == false) { viewer.sending = true; } if (viewer.slowRelay) { setTimeout(function () { try { viewer.ws.send(viewer.sendQueue.shift(), function () { sendViewerNext(viewer); }); } catch (ex) { } }, viewer.slowRelay); } else { try { viewer.ws.send(viewer.sendQueue.shift(), function () { sendViewerNext(viewer); }); } catch (ex) { } } checkViewerOverflow(viewer); } else { if (viewer.dataPtr != null) { // Send the next image //if ((viewer.lastImageNumberSent != null) && ((viewer.lastImageNumberSent + 1) != (viewer.dataPtr))) { console.log('SVIEW-S1', viewer.lastImageNumberSent, viewer.dataPtr); } // DEBUG var image = obj.images[viewer.dataPtr]; viewer.lastImageNumberSent = viewer.dataPtr; //if ((image.next != null) && ((viewer.dataPtr + 1) != image.next)) { console.log('SVIEW-S2', viewer.dataPtr, image.next); } // DEBUG viewer.dataPtr = image.next; if (viewer.slowRelay) { setTimeout(function () { try { viewer.ws.send(image.data, function () { sendViewerNext(viewer); }); } catch (ex) { } }, viewer.slowRelay); } else { try { viewer.ws.send(image.data, function () { sendViewerNext(viewer); }); } catch (ex) { } } // Flow control, pause the agent if needed if (viewer.sending == false) { viewer.sending = true; } checkViewerOverflow(viewer); } else { // Nothing to send viewer.sending = false; // Flow control, resume agent if needed checkViewerUnderflow(viewer); } } } // Process data coming from the agent or any viewers obj.processData = function (peer, data) { if (obj.viewers == null) return; if (peer == obj.agent) { obj.recordingFileWriting = true; recordData(true, data, function () { if (obj.viewers == null) return; obj.recordingFileWriting = false; if ((obj.viewersOverflowCount < obj.viewers.length) && obj.agent && (obj.agent.paused == true)) { obj.agent.paused = false; obj.agent.ws._socket.resume(); } obj.processAgentData(data); }); } else { obj.processViewerData(peer, data); } } // Process incoming viewer data obj.processViewerData = function (viewer, data) { if (typeof data == 'string') { if (data == '2') { if (obj.viewerConnected == false) { if (obj.agent != null) { if (obj.protocolOptions != null) { obj.sendToAgent(JSON.stringify(obj.protocolOptions)); } // Send connection options obj.sendToAgent('2'); // Send remote desktop connect } obj.viewerConnected = true; } return; } var json = null; try { json = JSON.parse(data); } catch (ex) { } if (json == null) return; if ((json.type == 'options') && (obj.protocolOptions == null)) { obj.protocolOptions = json; } if (json.ctrlChannel == '102938') { if ((json.type == 'lock') && (viewer.viewOnly == false)) { obj.sendToAgent('{"ctrlChannel":"102938","type":"lock"}'); } // Account lock support if ((json.type == 'autolock') && (viewer.viewOnly == false) && (typeof json.value == 'boolean')) { obj.sendToAgent('{"ctrlChannel":"102938","type":"autolock","value":' + json.value + '}'); } // Lock on disconnect } return; } //console.log('ViewerData', data.length, typeof data, data); if ((typeof data != 'object') || (data.length < 4)) return; // Ignore all control traffic for now (WebRTC) var command = data.readUInt16BE(0); var cmdsize = data.readUInt16BE(2); if (data.length != cmdsize) return; // Invalid command length //console.log('ViewerData', data.length, command, cmdsize); switch (command) { case 1: // Key Events, forward to agent if (viewer.viewOnly == false) { obj.sendToAgent(data); } break; case 2: // Mouse events, forward to agent if (viewer.viewOnly == false) { obj.sendToAgent(data); } break; case 5: // Compression if (data.length < 10) return; viewer.imageType = data[4]; // Image type: 1 = JPEG, 2 = PNG, 3 = TIFF, 4 = WebP viewer.imageCompression = data[5]; viewer.imageScaling = data.readUInt16BE(6); viewer.imageFrameRate = data.readUInt16BE(8); //console.log('Viewer-Compression', viewer.imageType, viewer.imageCompression, viewer.imageScaling, viewer.imageFrameRate); // See if this changes anything var viewersimageType = null; var viewersimageCompression = null; var viewersimageScaling = null; var viewersimageFrameRate = null; for (var i in obj.viewers) { if (viewersimageType == null) { viewersimageType = obj.viewers[i].imageType; } else if (obj.viewers[i].imageType != viewersimageType) { viewersimageType = 1; }; // Default to JPEG if viewers has different image formats if ((viewersimageCompression == null) || (obj.viewers[i].imageCompression > viewersimageCompression)) { viewersimageCompression = obj.viewers[i].imageCompression; }; if ((viewersimageScaling == null) || (obj.viewers[i].imageScaling > viewersimageScaling)) { viewersimageScaling = obj.viewers[i].imageScaling; }; if ((viewersimageFrameRate == null) || (obj.viewers[i].imageFrameRate < viewersimageFrameRate)) { viewersimageFrameRate = obj.viewers[i].imageFrameRate; }; } if ((obj.imageCompression != viewersimageCompression) || (obj.imageScaling != viewersimageScaling) || (obj.imageFrameRate != viewersimageFrameRate)) { // Update and send to agent new compression settings obj.imageType = viewersimageType; obj.imageCompression = viewersimageCompression; obj.imageScaling = viewersimageScaling; obj.imageFrameRate = viewersimageFrameRate //console.log('Send-Agent-Compression', obj.imageType, obj.imageCompression, obj.imageScaling, obj.imageFrameRate); var cmd = Buffer.alloc(10); cmd.writeUInt16BE(5, 0); // Command 5, compression cmd.writeUInt16BE(10, 2); // Command size, 10 bytes long cmd[4] = obj.imageType; // Image type: 1 = JPEG, 2 = PNG, 3 = TIFF, 4 = WebP cmd[5] = obj.imageCompression; // Image compression level cmd.writeUInt16BE(obj.imageScaling, 6); // Scaling level cmd.writeUInt16BE(obj.imageFrameRate, 8); // Frame rate timer obj.sendToAgent(cmd); } break; case 6: // Refresh, handle this on the server //console.log('Viewer-Refresh'); viewer.dataPtr = obj.firstData; // Start over if (viewer.sending == false) { sendViewerNext(viewer); } break; case 8: // Pause and unpause if (data.length != 5) break; var pause = data[4]; // 0 = Unpause, 1 = Pause if (viewer.desktopPaused == (pause == 1)) break; viewer.desktopPaused = (pause == 1); //console.log('Viewer-' + ((pause == 1)?'Pause':'UnPause')); var viewersPaused = true; for (var i in obj.viewers) { if (obj.viewers[i].desktopPaused == false) { viewersPaused = false; }; } if (viewersPaused != obj.desktopPaused) { obj.desktopPaused = viewersPaused; //console.log('Send-Agent-' + ((viewersPaused == true) ? 'Pause' : 'UnPause')); data[4] = (viewersPaused == true) ? 1 : 0; obj.sendToAgent(data); } break; case 10: // CTRL-ALT-DEL, forward to agent if (viewer.viewOnly == false) { obj.sendToAgent(data); } break; case 12: // SET DISPLAY, forward to agent if (viewer.viewOnly == false) { obj.sendToAgent(data); } break; case 14: // Touch setup break; case 82: // Request display information if (obj.lastDisplayLocationData != null) { obj.sendToAgent(obj.lastDisplayLocationData); } break; case 85: // Unicode Key Events, forward to agent if (viewer.viewOnly == false) { obj.sendToAgent(data); } break; case 87: // Remote input lock, forward to agent if (viewer.viewOnly == false) { obj.sendToAgent(data); } break; default: console.log('Un-handled viewer command: ' + command); break; } } // Process incoming agent data obj.processAgentData = function (data) { if ((typeof data != 'object') || (data.length < 4)) { if (typeof data == 'string') { var json = null; try { json = JSON.parse(data); } catch (ex) { } if (json == null) return; if (json.type == 'console') { // This is a console message, store it and forward this to all viewers if (json.msg != null) { obj.lastConsoleMessage = data; } else { obj.lastConsoleMessage = null; } obj.sendToAllViewers(data); } // All other control messages (notably WebRTC), are ignored for now. } return; // Ignore all other traffic } const jumboData = data; var command = data.readUInt16BE(0); var cmdsize = data.readUInt16BE(2); //console.log('AgentData', data.length, command, cmdsize); if ((command == 27) && (cmdsize == 8)) { // Jumbo packet if (data.length >= 12) { command = data.readUInt16BE(8); cmdsize = data.readUInt32BE(4); if (data.length == (cmdsize + 8)) { data = data.slice(8, data.length); } else { console.log('TODO-PARTIAL-JUMBO', command, cmdsize, data.length); return; // TODO } } } switch (command) { case 3: // Tile, check dimentions and store if ((data.length < 10) || (obj.lastData == null)) break; var x = data.readUInt16BE(4), y = data.readUInt16BE(6); var dimensions = require('image-size')(data.slice(8)); var sx = (x / 16), sy = (y / 16), sw = (dimensions.width / 16), sh = (dimensions.height / 16); obj.counter++; // Keep a reference to this image & how many tiles it covers obj.images[obj.counter] = { next: null, prev: obj.lastData, data: jumboData }; obj.images[obj.lastData].next = obj.counter; obj.lastData = obj.counter; obj.imagesCounters[obj.counter] = (sw * sh); obj.imagesCount++; if (obj.imagesCount == 2000000000) { obj.imagesCount = 1; } // Loop the counter if needed //console.log('Adding Image ' + obj.counter, x, y, dimensions.width, dimensions.height); // Update the screen with the correct pointers. for (var i = 0; i < sw; i++) { for (var j = 0; j < sh; j++) { var k = ((obj.swidth * (j + sy)) + (i + sx)); const oi = obj.screen[k]; obj.screen[k] = obj.counter; if ((oi != null) && (--obj.imagesCounters[oi] == 0)) { // Remove data from the link list obj.imagesCount--; var d = obj.images[oi]; //console.log('Removing Image', oi, obj.images[oi].prev, obj.images[oi].next); obj.images[d.prev].next = d.next; obj.images[d.next].prev = d.prev; delete obj.images[oi]; delete obj.imagesCounters[oi]; // If any viewers are currently on image "oi" must be moved to "d.next" for (var l in obj.viewers) { const v = obj.viewers[l]; if (v.dataPtr == oi) { v.dataPtr = d.next; } } } } } // Any viewer on dataPtr null, change to this image for (var i in obj.viewers) { const v = obj.viewers[i]; if (v.dataPtr == null) { v.dataPtr = obj.counter; if (v.sending == false) { sendViewerNext(v); } } } // Debug, display the link list //var xx = '', xptr = obj.firstData; //while (xptr != null) { xx += '>' + xptr; xptr = obj.images[xptr].next; } //console.log('list', xx); //console.log('images', obj.imagesCount); break; case 4: // Tile Copy, do nothing. break; case 7: // Screen Size, clear the screen state and compute the tile count if (data.length < 8) break; if ((obj.width === data.readUInt16BE(4)) && (obj.height === data.readUInt16BE(6))) break; // Same screen size as before, skip this. obj.counter++; obj.lastScreenSizeCmd = data; obj.lastScreenSizeCounter = obj.counter; obj.width = data.readUInt16BE(4); obj.height = data.readUInt16BE(6); obj.swidth = obj.width / 16; obj.sheight = obj.height / 16; if (Math.floor(obj.swidth) != obj.swidth) { obj.swidth = Math.floor(obj.swidth) + 1; } if (Math.floor(obj.sheight) != obj.sheight) { obj.sheight = Math.floor(obj.sheight) + 1; } // Reset the display obj.screen = new Array(obj.swidth * obj.sheight); obj.imagesCount = 0; obj.imagesCounters = {}; obj.images = {}; obj.images[obj.counter] = { next: null, prev: null, data: data }; obj.firstData = obj.counter; obj.lastData = obj.counter; // Add viewers must be set to start at "obj.counter" for (var i in obj.viewers) { const v = obj.viewers[i]; v.dataPtr = obj.counter; if (v.sending == false) { sendViewerNext(v); } } //console.log("ScreenSize", obj.width, obj.height, obj.swidth, obj.sheight, obj.swidth * obj.sheight); break; case 11: // GetDisplays // Store and send this to all viewers right away obj.lastDisplayInfoData = data; obj.sendToAllInputViewers(data); break; case 12: // SetDisplay obj.sendToAllInputViewers(data); break; case 14: // KVM_INIT_TOUCH break; case 15: // KVM_TOUCH break; case 16: // MNG_KVM_CONNECTCOUNT break; case 17: // MNG_KVM_MESSAGE // Send this to all viewers right away obj.sendToAllViewers(data); break; case 65: // Alert // Send this to all viewers right away obj.sendToAllViewers(data); break; case 82: // Display information if ((data.length < 14) || (((data.length - 4) % 10) != 0)) break; // Command must be 14 bytes and have header + 10 byte for each display. obj.lastDisplayLocationData = data; obj.sendToAllInputViewers(data); break; case 87: // MNG_KVM_INPUT_LOCK // Send this to all viewers right away // This will update all views on the current state of the input lock obj.sendToAllInputViewers(data); break; case 88: // MNG_KVM_MOUSE_CURSOR // Send this to all viewers right away obj.sendToAllInputViewers(data); break; default: console.log('Un-handled agent command: ' + command + ', length: ' + cmdsize); break; } } function startRecording(domain, start, func) { if ((obj.pendingRecording == 1) || (obj.recordingFile != null)) { func(true); return; } // Check if already recording if (start == false) { func(false); return; } // Just skip this obj.pendingRecording = 1; var now = new Date(Date.now()); var recFilename = 'desktopSession' + ((domain.id == '') ? '' : '-') + domain.id + '-' + now.getUTCFullYear() + '-' + parent.common.zeroPad(now.getUTCMonth() + 1, 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) + '-' + obj.nodeid.split('/')[2] + '.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) { delete obj.pendingRecording; if (err != null) { parent.parent.debug('relay', 'Relay: Unable to record to file: ' + recFullFilename); func(false); return; } // Write the recording file header parent.parent.debug('relay', 'Relay: Started recoding to file: ' + recFullFilename); var metadata = { magic: 'MeshCentralRelaySession', ver: 1, nodeid: obj.nodeid, meshid: obj.meshid, time: new Date().toLocaleString(), protocol: 2, devicename: obj.name, devicegroup: obj.meshname }; var firstBlock = JSON.stringify(metadata); recordingEntry(fd, 1, 0, firstBlock, function () { obj.recordingFile = { fd: fd, filename: recFullFilename }; obj.recordingFileWriting = false; func(true); }); }); } // Here, we check if we have to record the device, regardless of what user is looking at it. function recordingSetup(domain, func) { var record = false; // Setup session recording if (((domain.sessionrecording == true) || ((typeof domain.sessionrecording == 'object') && ((domain.sessionrecording.protocols == null) || (domain.sessionrecording.protocols.indexOf(2) >= 0))))) { record = true; // Check again to make sure we need to start recording if ((typeof domain.sessionrecording == 'object') && ((domain.sessionrecording.onlyselecteddevicegroups === true) || (domain.sessionrecording.onlyselectedusergroups === true) || (domain.sessionrecording.onlyselectedusers === true))) { record = false; // Check device group recording if (domain.sessionrecording.onlyselecteddevicegroups === true) { var mesh = parent.meshes[obj.meshid]; if ((mesh.flags != null) && ((mesh.flags & 4) != 0)) { record = true; } } } } startRecording(domain, record, func); } // Record data to the recording file function recordData(isAgent, data, func) { try { if (obj.recordingFile != null) { // Write data to recording file recordingEntry(obj.recordingFile.fd, 2, (isAgent ? 0 : 2), data, function () { func(data); }); } else { func(data); } } catch (ex) { console.log(ex); } } // Record a new entry in a recording log function recordingEntry(fd, type, flags, data, func, tag) { try { 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(fd, block, 0, block.length, function () { func(fd, tag); }); obj.recordingFileSize += 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(fd, block, 0, block.length, function () { func(fd, tag); }); obj.recordingFileSize += block.length; } } catch (ex) { console.log(ex); func(fd, tag); } } // 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') || (typeof domain.sessionrecording.maxrecordingdays == 'number'))) { parent.cleanUpRecordingsActive = true; setTimeout(function () { var recPath = null, fs = require('fs'), now = Date.now(); 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 stats = null; try { stats = fs.statSync(parent.parent.path.join(recPath, files[i])); } catch (ex) { } if (stats != null) { recfiles.push({ n: files[i], r: files[i].substring(j + 1), s: stats.size, t: stats.mtimeMs }); } } } } 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') && (domain.sessionrecording.maxrecordings > 0) && (totalFiles >= domain.sessionrecording.maxrecordings)) { overQuota = true; } else if ((typeof domain.sessionrecording.maxrecordingsizemegabytes == 'number') && (domain.sessionrecording.maxrecordingsizemegabytes > 0) && (totalSize >= (domain.sessionrecording.maxrecordingsizemegabytes * 1048576))) { overQuota = true; } else if ((typeof domain.sessionrecording.maxrecordingdays == 'number') && (domain.sessionrecording.maxrecordingdays > 0) && (((now - recfiles[i].t) / 1000 / 60 / 60 / 24) >= domain.sessionrecording.maxrecordingdays)) { overQuota = true; } if (overQuota) { fs.unlinkSync(parent.parent.path.join(recPath, recfiles[i].n)); } totalFiles++; totalSize += recfiles[i].s; } delete parent.cleanUpRecordingsActive; }); }, 500); } } // Get node information parent.db.Get(nodeid, function (err, nodes) { if ((err != null) || (nodes.length != 1)) { func(null); return; } obj.meshid = nodes[0].meshid; obj.icon = nodes[0].icon; obj.name = nodes[0].name; recordingSetup(domain, function () { func(obj); }); }); return obj; } function checkDeviceSharePublicIdentifier(parent, domain, nodeid, pid, extraKey, 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) && ((docs[i].extrakey == null) || (docs[i].extrakey === extraKey))) { 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, cookie.k, 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); } } // If we are in multi-server mode, the desktop multiplexor needs to be created on the server with the agent connected to it. // So, if the agent is connected to a different server, just relay the connection to that server function CreateMeshRelayEx(parent, ws, req, domain, user, cookie) { // Do validation work if (cookie) { if ((typeof cookie.expire == 'number') && (cookie.expire <= Date.now())) { delete req.query.nodeid; } else if (typeof cookie.nid == 'string') { req.query.nodeid = cookie.nid; } } if ((req.query.nodeid == null) || (req.query.p != '2') || (req.query.id == null) || (domain == null)) { try { ws.close(); } catch (e) { } return; } // Not is not a valid remote desktop connection. // Check routing if in multi-server mode var nodeid = req.query.nodeid; if (parent.parent.multiServer != null) { const routing = parent.parent.GetRoutingServerIdNotSelf(nodeid, 1); // 1 = MeshAgent routing type if (routing == null) { // No need to relay the connection to a different server return CreateMeshRelayEx2(parent, ws, req, domain, user, cookie); } else { // We must relay the connection to a different server return parent.parent.multiServer.createPeerRelay(ws, req, routing.serverid, req.session.userid); } } else { // No need to relay the connection to a different server return CreateMeshRelayEx2(parent, ws, req, domain, user, cookie); } } function CreateMeshRelayEx2(parent, ws, req, domain, user, cookie) { const currentTime = Date.now(); var obj = {}; obj.ws = ws; obj.ws.me = obj; obj.id = req.query.id; obj.nodeid = req.query.nodeid; obj.user = user; obj.ruserid = null; obj.req = req; // Used in multi-server.js obj.viewOnly = ((cookie != null) && (cookie.vo == 1)); // set view only mode if ((cookie != null) && (cookie.nouser == 1)) { obj.nouser = true; } // This is a relay without user authentication // If the domain has remote desktop viewonly set, force everyone to be in viewonly mode. if ((typeof domain.desktop == 'object') && (domain.desktop.viewonly == true)) { obj.viewOnly = true; } // Setup traffic accounting if (parent.trafficStats.desktopMultiplex == null) { parent.trafficStats.desktopMultiplex = { connections: 1, sessions: 0, in: 0, out: 0 }; } else { parent.trafficStats.desktopMultiplex.connections++; } ws._socket.bytesReadEx = 0; ws._socket.bytesWrittenEx = 0; // 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; obj.guestName = cookie.gn; parent.parent.AddEventDispatch([obj.nodeid], obj); obj.HandleEvent = function (source, event, ids, id) { if ((event.action == 'removedDeviceShare') && (obj.pid == event.publicid)) { obj.close(); } } } // 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; } else if (rcookie.nouser === 1) { obj.rnouser = true; } if (rcookie.nodeid != null) { obj.nodeid = rcookie.nodeid; } } // If there is no authentication, drop this connection if ((obj.id != null) && (obj.user == null) && (obj.ruserid == null) && (obj.nouser !== true) && (obj.rnouser !== true)) { try { ws.close(); parent.parent.debug('relay', 'DesktopRelay: 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++; // 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 (obj.ws == null) return; // Already closed. // Close the connection if ((arg == 1) || (arg == null)) { try { ws.close(); parent.parent.debug('relay', 'DesktopRelay: 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', 'DesktopRelay: Hard disconnect (' + obj.req.clientIp + ')'); } catch (e) { console.log(e); } } // Hard close, close the TCP socket if (obj.relaySessionCounted) { parent.relaySessionCount--; delete obj.relaySessionCounted; } if ((obj.deskMultiplexor != null) && (typeof obj.deskMultiplexor == 'object') && (obj.deskMultiplexor.removePeer(obj) == true)) { delete parent.desktoprelays[obj.nodeid]; } // Aggressive cleanup delete obj.id; delete obj.ws; delete obj.req; delete obj.user; delete obj.nodeid; delete obj.ruserid; delete obj.expireTimer; delete obj.deskMultiplexor; // Clear timers if present 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); } }; obj.sendAgentMessage = function (command, userid, domainid) { var rights, mesh; if (command.nodeid == null) return false; var user = null; if (userid != null) { 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 if (userid == null) { rights = MESHRIGHT_REMOTECONTROL; } else { rights = parent.GetNodeRights(user, agent.dbMeshKey, agent.dbNodeKey); } mesh = parent.meshes[agent.dbMeshKey]; if ((rights != null) && (mesh != null) || ((rights & 16) != 0)) { // TODO: 16 is console permission, may need more gradular permission checking 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 ((command.rights != 0xFFFFFFFF) && ((command.rights & 0x100) != 0)) { command.rights -= 0x100; } // Since the multiplexor will enforce view-only, remove MESHRIGHT_REMOTEVIEWONLY 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 if (user != null) { 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 if (userid == null) { rights = MESHRIGHT_REMOTECONTROL; } else { rights = parent.GetNodeRights(user, routing.meshid, command.nodeid); } mesh = parent.meshes[routing.meshid]; if (rights != null || ((rights & 16) != 0)) { // TODO: 16 is console permission, may need more gradular permission checking 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 ((command.rights != 0xFFFFFFFF) && ((command.rights & 0x00000100) != 0)) { command.rights -= 0x00000100; } // Since the multiplexor will enforce view-only, remove MESHRIGHT_REMOTEVIEWONLY 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 if (user != null) { 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; }; // 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(retryCount) { if ((obj.id == null) || (retryCount > 20)) { try { obj.close(); } catch (e) { } return null; } // Attempt to connect without id, drop this. if (retryCount == 0) { ws._socket.setKeepAlive(true, 240000); } // Set TCP keep alive /* // 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 (user == null) { // 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]; } */ if (retryCount == 0) { // Setup the agent PING/PONG timers 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.parent.debug('relay', 'DesktopRelay: Connection (' + obj.req.clientIp + ')'); } // Create if needed and add this peer to the desktop multiplexor obj.deskMultiplexor = parent.desktoprelays[obj.nodeid]; if (obj.deskMultiplexor == null) { parent.desktoprelays[obj.nodeid] = 1; // Indicate that the creating of the desktop multiplexor is pending. parent.parent.debug('relay', 'DesktopRelay: Creating new desktop multiplexor'); CreateDesktopMultiplexor(parent, domain, obj.nodeid, function (deskMultiplexor) { if (deskMultiplexor != null) { // Desktop multiplexor was created, use it. obj.deskMultiplexor = deskMultiplexor; parent.desktoprelays[obj.nodeid] = obj.deskMultiplexor; obj.deskMultiplexor.addPeer(obj); ws._socket.resume(); // Release the traffic } else { // An error has occured, close this connection delete parent.desktoprelays[obj.nodeid]; ws.close(); } }); } else { if (obj.deskMultiplexor == 1) { // The multiplexor is being created, hold a little and try again. This is to prevent a possible race condition. setTimeout(function () { performRelay(++retryCount); }, 50); } else { // Hook up this peer to the multiplexor and release the traffic obj.deskMultiplexor.addPeer(obj); ws._socket.resume(); } } } // When data is received from the mesh relay web socket ws.on('message', function (data) { // Data accounting parent.trafficStats.desktopMultiplex.in += (this._socket.bytesRead - this._socket.bytesReadEx); parent.trafficStats.desktopMultiplex.out += (this._socket.bytesWritten - this._socket.bytesWrittenEx); this._socket.bytesReadEx = this._socket.bytesRead; this._socket.bytesWrittenEx = this._socket.bytesWritten; // If this data was received by the agent, decode it. if (this.me.deskMultiplexor != null) { this.me.deskMultiplexor.processData(this.me, data); } }); // If error, close both sides of the relay. ws.on('error', function (err) { //console.log('ws-error', err); parent.relaySessionErrorCount++; console.log('Relay error from ' + obj.req.clientIp + ', ' + err.toString().split('\r')[0] + '.'); obj.close(); }); // If the relay web socket is closed, close both sides. ws.on('close', function (req) { // Data accounting parent.trafficStats.desktopMultiplex.in += (this._socket.bytesRead - this._socket.bytesReadEx); parent.trafficStats.desktopMultiplex.out += (this._socket.bytesWritten - this._socket.bytesWrittenEx); this._socket.bytesReadEx = this._socket.bytesRead; this._socket.bytesWrittenEx = this._socket.bytesWritten; //console.log('ws-close', req); obj.close(); }); // If this session has a expire time, setup the expire timer now. setExpireTimer(); // Mark this relay session as authenticated if this is the user end. obj.authenticated = ((user != null) || (obj.nouser === true)); 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 (obj.req == null) return; // This connection was closed. 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 ((obj.nouser !== true) && ((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 rcookieData = { nodeid: node._id }; if (user != null) { rcookieData.ruserid = user._id; } else if (obj.nouser === true) { rcookieData.nouser = 1; } const rcookie = parent.parent.encodeCookie(rcookieData, parent.parent.loginCookieEncryptionKey); if (obj.id == undefined) { obj.id = ('' + Math.random()).substring(2); } // If there is no connection id, generate one. const command = { nodeid: node._id, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?id=' + obj.id + '&rauth=' + rcookie, tcpport: cookie.tcpport, tcpaddr: cookie.tcpaddr }; parent.parent.debug('relay', 'Relay: Sending agent tunnel command: ' + JSON.stringify(command)); if (obj.sendAgentMessage(command, user ? user._id : null, cookie.domainid) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); } performRelay(0); }); 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 (obj.req == null) return; // This connection was closed. 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 ((obj.nouser !== true) && ((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 rcookieData = { nodeid: node._id }; if (user != null) { rcookieData.ruserid = user._id; } else if (obj.nouser === true) { rcookieData.nouser = 1; } const rcookie = parent.parent.encodeCookie(rcookieData, parent.parent.loginCookieEncryptionKey); if (obj.req.query.tcpport != null) { const command = { nodeid: node._id, action: 'msg', type: 'tunnel', 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) }; parent.parent.debug('relay', 'Relay: Sending agent TCP tunnel command: ' + JSON.stringify(command)); if (obj.sendAgentMessage(command, user ? user._id : null, 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: node._id, action: 'msg', type: 'tunnel', 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) }; parent.parent.debug('relay', 'Relay: Sending agent UDP tunnel command: ' + JSON.stringify(command)); if (obj.sendAgentMessage(command, user ? user._id : null, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); } } performRelay(0); }); return obj; } else if ((cookie != null) && (cookie.nid != null) && (typeof cookie.r == '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 (obj.req == null) return; // This connection was closed. 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 ((obj.nouser !== true) && ((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 rcookieData = { nodeid: node._id }; if (user != null) { rcookieData.ruserid = user._id; } else if (obj.nouser === true) { rcookieData.nouser = 1; } const rcookie = parent.parent.encodeCookie(rcookieData, parent.parent.loginCookieEncryptionKey); const command = { nodeid: node._id, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?p=2&id=' + obj.id + '&rauth=' + rcookie + '&nodeid=' + node._id, soptions: {}, usage: 2, rights: cookie.r, guestname: cookie.gn, consent: cookie.cf, remoteaddr: cleanRemoteAddr(obj.req.clientIp) }; if (user != null) { command.userid = user._id; } 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 ? user._id : null, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); } performRelay(0); }); return obj; } } // Set the session expire timer function setExpireTimer() { if (obj.expireTimer != null) { clearTimeout(obj.expireTimer); delete obj.expireTimer; } if (cookie && (typeof cookie.expire == 'number')) { const timeToExpire = (cookie.expire - Date.now()); if (timeToExpire < 1) { obj.close(); } else if (timeToExpire >= 0x7FFFFFFF) { obj.expireTimer = setTimeout(setExpireTimer, 0x7FFFFFFF); // Since expire timer can't be larger than 0x7FFFFFFF, reset timer after that time. } else { obj.expireTimer = setTimeout(obj.close, timeToExpire); } } } // Check if this user has input access on the device if ((obj.user != null) && (obj.viewOnly == false)) { obj.viewOnly = true; // Set a view only for now until we figure out otherwise parent.db.Get(obj.nodeid, function (err, docs) { if (obj.req == null) return; // This connection was closed. 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 const rights = parent.GetNodeRights(obj.user, node.meshid, node._id); if ((rights & 0x00000008) == 0) { try { obj.close(); } catch (e) { } return; } // Check MESHRIGHT_ADMIN or MESHRIGHT_REMOTECONTROL if ((rights != 0xFFFFFFFF) && ((rights & 0x00010000) != 0)) { try { obj.close(); } catch (e) { } return; } // Check MESHRIGHT_NODESKTOP if ((rights == 0xFFFFFFFF) || ((rights & 0x00000100) == 0)) { obj.viewOnly = false; } // Check MESHRIGHT_REMOTEVIEWONLY performRelay(0); }); } else { // If this is not an authenticated session, or the session does not have routing instructions, just go ahead an connect to existing session. performRelay(0); } 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. */