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MeshCentral/apprelays.js

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/**
* @description MeshCentral MSTSC & SSH relay
* @author Ylian Saint-Hilaire & Bryan Roe
* @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";
// Construct a MSTSC Relay object, called upon connection
// This is a bit of a hack as we are going to run the RDP connection thru a loopback connection.
// If the "node-rdpjs-2" module supported passing a socket, we would do something different.
module.exports.CreateMstscRelay = function (parent, db, ws, req, args, domain) {
const Net = require('net');
const WebSocket = require('ws');
var obj = {};
obj.ws = ws;
obj.tcpServerPort = 0;
obj.relayActive = false;
var rdpClient = null;
parent.parent.debug('relay', 'RDP: Request for RDP relay (' + req.clientIp + ')');
// Disconnect
obj.close = function (arg) {
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if (obj.ws == null) return;
// Collect how many raw bytes where received and sent.
// We sum both the websocket and TCP client in this case.
//var inTraffc = obj.ws._socket.bytesRead, outTraffc = obj.ws._socket.bytesWritten;
//if (obj.wsClient != null) { inTraffc += obj.wsClient._socket.bytesRead; outTraffc += obj.wsClient._socket.bytesWritten; }
//console.log('WinRDP - in', inTraffc, 'out', outTraffc);
if (obj.wsClient) { obj.wsClient.close(); delete obj.wsClient; }
if (obj.tcpServer) { obj.tcpServer.close(); obj.tcpServer.destroy(); delete obj.tcpServer; }
if (rdpClient) { rdpClient.close(); rdpClient = null; }
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if ((arg == 1) || (arg == null)) { try { ws.close(); } catch (e) { console.log(e); } } // Soft close, close the websocket
if (arg == 2) { try { ws._socket._parent.end(); } catch (e) { console.log(e); } } // Hard close, close the TCP socket
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obj.ws.removeAllListeners();
obj.relayActive = false;
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delete obj.ws;
};
// Start the looppback server
function startTcpServer() {
obj.tcpServer = new Net.Server();
obj.tcpServer.listen(0, '127.0.0.1', function () { obj.tcpServerPort = obj.tcpServer.address().port; startRdp(obj.tcpServerPort); });
obj.tcpServer.on('connection', function (socket) {
if (obj.relaySocket != null) {
socket.close();
} else {
obj.relaySocket = socket;
obj.relaySocket.pause();
obj.relaySocket.on('data', function (chunk) { // Make sure to handle flow control.
if (obj.relayActive == true) { obj.relaySocket.pause(); obj.wsClient.send(chunk, function () { obj.relaySocket.resume(); }); }
});
obj.relaySocket.on('end', function () { obj.close(); });
obj.relaySocket.on('error', function (err) { obj.close(); });
// Decode the authentication cookie
var cookie = parent.parent.decodeCookie(obj.infos.ip, parent.parent.loginCookieEncryptionKey);
if (cookie == null) return;
// Setup the correct URL with domain and use TLS only if needed.
var options = { rejectUnauthorized: false };
if (domain.dns != null) { options.servername = domain.dns; }
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var protocol = (args.tlsoffload) ? 'ws' : 'wss';
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var domainadd = '';
if ((domain.dns == null) && (domain.id != '')) { domainadd = domain.id + '/' }
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var url = protocol + '://127.0.0.1:' + args.port + '/' + domainadd + ((cookie.lc == 1) ? 'local' : 'mesh') + 'relay.ashx?noping=1&p=10&auth=' + obj.infos.ip; // Protocol 10 is Web-RDP
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parent.parent.debug('relay', 'RDP: Connection websocket to ' + url);
obj.wsClient = new WebSocket(url, options);
obj.wsClient.on('open', function () { parent.parent.debug('relay', 'RDP: Relay websocket open'); });
obj.wsClient.on('message', function (data) { // Make sure to handle flow control.
if ((obj.relayActive == false) && (data == 'c')) {
obj.relayActive = true; obj.relaySocket.resume();
} else {
obj.wsClient._socket.pause();
obj.relaySocket.write(data, function () { obj.wsClient._socket.resume(); });
}
});
obj.wsClient.on('close', function () { parent.parent.debug('relay', 'RDP: Relay websocket closed'); obj.close(); });
obj.wsClient.on('error', function (err) { parent.parent.debug('relay', 'RDP: Relay websocket error: ' + err); obj.close(); });
obj.tcpServer.close();
obj.tcpServer = null;
}
});
}
// Start the RDP client
function startRdp(port) {
parent.parent.debug('relay', 'RDP: Starting RDP client on loopback port ' + port);
try {
rdpClient = require('node-rdpjs-2').createClient({
logLevel: 'ERROR',
domain: obj.infos.domain,
userName: obj.infos.username,
password: obj.infos.password,
enablePerf: true,
autoLogin: true,
screen: obj.infos.screen,
locale: obj.infos.locale
}).on('connect', function () {
send(['rdp-connect']);
}).on('bitmap', function (bitmap) {
try { ws.send(bitmap.data); } catch (ex) { } // Send the bitmap data as binary
delete bitmap.data;
send(['rdp-bitmap', bitmap]); // Send the bitmap metadata seperately, without bitmap data.
}).on('close', function () {
send(['rdp-close']);
}).on('error', function (err) {
send(['rdp-error', err]);
}).connect('127.0.0.1', obj.tcpServerPort);
} catch (ex) {
console.log('startRdpException', ex);
obj.close();
}
}
// When data is received from the web socket
// RDP default port is 3389
ws.on('message', function (msg) {
try {
msg = JSON.parse(msg);
switch (msg[0]) {
case 'infos': { obj.infos = msg[1]; startTcpServer(); break; }
case 'mouse': { if (rdpClient) { rdpClient.sendPointerEvent(msg[1], msg[2], msg[3], msg[4]); } break; }
case 'wheel': { if (rdpClient) { rdpClient.sendWheelEvent(msg[1], msg[2], msg[3], msg[4]); } break; }
case 'scancode': { if (rdpClient) { rdpClient.sendKeyEventScancode(msg[1], msg[2]); } break; }
case 'unicode': { if (rdpClient) { rdpClient.sendKeyEventUnicode(msg[1], msg[2]); } break; }
case 'disconnect': { obj.close(); break; }
}
} catch (ex) {
console.log('RdpMessageException', msg, ex);
obj.close();
}
});
// If error, do nothing
ws.on('error', function (err) { parent.parent.debug('relay', 'RDP: Browser websocket error: ' + err); obj.close(); });
// If the web socket is closed
ws.on('close', function (req) { parent.parent.debug('relay', 'RDP: Browser websocket closed'); obj.close(); });
// Send an object with flow control
function send(obj) {
try { rdpClient.bufferLayer.socket.pause(); } catch (ex) { }
try { ws.send(JSON.stringify(obj), function () { try { rdpClient.bufferLayer.socket.resume(); } catch (ex) { } }); } catch (ex) { }
}
// We are all set, start receiving data
ws._socket.resume();
return obj;
};
// Construct a SSH Relay object, called upon connection
module.exports.CreateSshRelay = function (parent, db, ws, req, args, domain) {
const Net = require('net');
const WebSocket = require('ws');
// SerialTunnel object is used to embed SSH within another connection.
function SerialTunnel(options) {
var obj = new require('stream').Duplex(options);
obj.forwardwrite = null;
obj.updateBuffer = function (chunk) { this.push(chunk); };
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obj._write = function (chunk, encoding, callback) { if (obj.forwardwrite != null) { obj.forwardwrite(chunk); } if (callback) callback(); }; // Pass data written to forward
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obj._read = function (size) { }; // Push nothing, anything to read should be pushed from updateBuffer()
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obj.destroy = function () { delete obj.forwardwrite; }
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return obj;
}
const obj = {};
obj.ws = ws;
obj.relayActive = false;
parent.parent.debug('relay', 'SSH: Request for SSH relay (' + req.clientIp + ')');
// Disconnect
obj.close = function (arg) {
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if (obj.ws == null) return;
// Collect how many raw bytes where received and sent.
// We sum both the websocket and TCP client in this case.
//var inTraffc = obj.ws._socket.bytesRead, outTraffc = obj.ws._socket.bytesWritten;
//if (obj.wsClient != null) { inTraffc += obj.wsClient._socket.bytesRead; outTraffc += obj.wsClient._socket.bytesWritten; }
//console.log('WinSSH - in', inTraffc, 'out', outTraffc);
if (obj.sshShell) {
obj.sshShell.destroy();
obj.sshShell.removeAllListeners('data');
obj.sshShell.removeAllListeners('close');
try { obj.sshShell.end(); } catch (ex) { console.log(ex); }
delete obj.sshShell;
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}
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if (obj.sshClient) {
obj.sshClient.destroy();
obj.sshClient.removeAllListeners('ready');
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try { obj.sshClient.end(); } catch (ex) { console.log(ex); }
delete obj.sshClient;
}
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if (obj.wsClient) {
obj.wsClient.removeAllListeners('open');
obj.wsClient.removeAllListeners('message');
obj.wsClient.removeAllListeners('close');
try { obj.wsClient.close(); } catch (ex) { console.log(ex); }
delete obj.wsClient;
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}
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if ((arg == 1) || (arg == null)) { try { ws.close(); } catch (e) { console.log(e); } } // Soft close, close the websocket
if (arg == 2) { try { ws._socket._parent.end(); } catch (e) { console.log(e); } } // Hard close, close the TCP socket
obj.ws.removeAllListeners();
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obj.relayActive = false;
delete obj.termSize;
delete obj.cookie;
delete obj.ws;
};
// Decode the authentication cookie
obj.cookie = parent.parent.decodeCookie(req.query.auth, parent.parent.loginCookieEncryptionKey);
if (obj.cookie == null) { obj.ws.send(JSON.stringify({ action: 'sessionerror' })); obj.close(); return; }
Added SSH support in terminal tab for local devices.
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console.log(obj.cookie);
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// Start the looppback server
function startRelayConnection() {
try {
// Setup the correct URL with domain and use TLS only if needed.
var options = { rejectUnauthorized: false };
if (domain.dns != null) { options.servername = domain.dns; }
var protocol = 'wss';
if (args.tlsoffload) { protocol = 'ws'; }
var domainadd = '';
if ((domain.dns == null) && (domain.id != '')) { domainadd = domain.id + '/' }
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var url = protocol + '://127.0.0.1:' + args.port + '/' + domainadd + ((obj.cookie.lc == 1) ? 'local' : 'mesh') + 'relay.ashx?noping=1&p=11&auth=' + req.query.auth; // Protocol 11 is Web-SSH
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parent.parent.debug('relay', 'SSH: Connection websocket to ' + url);
obj.wsClient = new WebSocket(url, options);
obj.wsClient.on('open', function () { parent.parent.debug('relay', 'SSH: Relay websocket open'); });
obj.wsClient.on('message', function (data) { // Make sure to handle flow control.
if ((obj.relayActive == false) && (data == 'c')) {
obj.relayActive = true;
// Create a serial tunnel && SSH module
obj.ser = new SerialTunnel();
const Client = require('ssh2').Client;
obj.sshClient = new Client();
obj.sshClient.on('ready', function () { // Authentication was successful.
obj.sshClient.shell(function (err, stream) { // Start a remote shell
if (err) { obj.close(); return; }
obj.sshShell = stream;
obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width);
obj.sshShell.on('close', function () { obj.close(); });
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obj.sshShell.on('data', function (data) { obj.ws.send('~' + data.toString()); });
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});
obj.ws.send(JSON.stringify({ action: 'connected' }));
});
obj.sshClient.on('error', function (err) {
if (err.level == 'client-authentication') { obj.ws.send(JSON.stringify({ action: 'autherror' })); }
obj.close();
});
// Setup the serial tunnel, SSH ---> Relay WS
obj.ser.forwardwrite = function (data) { if ((data.length > 0) && (obj.wsClient != null)) { try { obj.wsClient.send(data); } catch (ex) { } } };
// Connect the SSH module to the serial tunnel
var connectionOptions = { sock: obj.ser }
if (typeof obj.username == 'string') { connectionOptions.username = obj.username; delete obj.username; }
if (typeof obj.password == 'string') { connectionOptions.password = obj.password; delete obj.password; }
obj.sshClient.connect(connectionOptions);
// We are all set, start receiving data
ws._socket.resume();
} else {
// Relay WS --> SSH
if ((data.length > 0) && (obj.ser != null)) { try { obj.ser.updateBuffer(data); } catch (ex) { console.log(ex); } }
}
});
obj.wsClient.on('close', function () { parent.parent.debug('relay', 'SSH: Relay websocket closed'); obj.close(); });
obj.wsClient.on('error', function (err) { parent.parent.debug('relay', 'SSH: Relay websocket error: ' + err); obj.close(); });
} catch (ex) {
console.log(ex);
}
}
// When data is received from the web socket
// SSH default port is 22
ws.on('message', function (msg) {
try {
if (typeof msg != 'string') return;
if (msg[0] == '{') {
// Control data
msg = JSON.parse(msg);
if (typeof msg.action != 'string') return;
switch (msg.action) {
case 'connect': {
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// TODO: Verify inputs
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obj.termSize = msg;
obj.username = msg.username;
obj.password = msg.password;
startRelayConnection();
break;
}
case 'resize': {
obj.termSize = msg;
if (obj.sshShell != null) { obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width); }
break;
}
}
} else if (msg[0] == '~') {
// Terminal data
if (obj.sshShell != null) { obj.sshShell.write(msg.substring(1)); }
}
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} catch (ex) { obj.close(); }
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});
// If error, do nothing
ws.on('error', function (err) { parent.parent.debug('relay', 'SSH: Browser websocket error: ' + err); obj.close(); });
// If the web socket is closed
ws.on('close', function (req) { parent.parent.debug('relay', 'SSH: Browser websocket closed'); obj.close(); });
return obj;
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};
// Construct a SSH Terminal Relay object, called upon connection
module.exports.CreateSshTerminalRelay = function (parent, db, ws, req, domain, user, cookie, args) {
const Net = require('net');
const WebSocket = require('ws');
// SerialTunnel object is used to embed SSH within another connection.
function SerialTunnel(options) {
var obj = new require('stream').Duplex(options);
obj.forwardwrite = null;
obj.updateBuffer = function (chunk) { this.push(chunk); };
obj._write = function (chunk, encoding, callback) { if (obj.forwardwrite != null) { obj.forwardwrite(chunk); } if (callback) callback(); }; // Pass data written to forward
obj._read = function (size) { }; // Push nothing, anything to read should be pushed from updateBuffer()
obj.destroy = function () { delete obj.forwardwrite; }
return obj;
}
const obj = {};
obj.ws = ws;
obj.relayActive = false;
parent.parent.debug('relay', 'SSH: Request for SSH relay (' + req.clientIp + ')');
// Disconnect
obj.close = function (arg) {
if (obj.ws == null) return;
// Collect how many raw bytes where received and sent.
// We sum both the websocket and TCP client in this case.
//var inTraffc = obj.ws._socket.bytesRead, outTraffc = obj.ws._socket.bytesWritten;
//if (obj.wsClient != null) { inTraffc += obj.wsClient._socket.bytesRead; outTraffc += obj.wsClient._socket.bytesWritten; }
//console.log('WinSSH - in', inTraffc, 'out', outTraffc);
if (obj.sshShell) {
obj.sshShell.destroy();
obj.sshShell.removeAllListeners('data');
obj.sshShell.removeAllListeners('close');
try { obj.sshShell.end(); } catch (ex) { console.log(ex); }
delete obj.sshShell;
}
if (obj.sshClient) {
obj.sshClient.destroy();
obj.sshClient.removeAllListeners('ready');
try { obj.sshClient.end(); } catch (ex) { console.log(ex); }
delete obj.sshClient;
}
if (obj.wsClient) {
obj.wsClient.removeAllListeners('open');
obj.wsClient.removeAllListeners('message');
obj.wsClient.removeAllListeners('close');
try { obj.wsClient.close(); } catch (ex) { console.log(ex); }
delete obj.wsClient;
}
if ((arg == 1) || (arg == null)) { try { ws.close(); } catch (e) { console.log(e); } } // Soft close, close the websocket
if (arg == 2) { try { ws._socket._parent.end(); } catch (e) { console.log(e); } } // Hard close, close the TCP socket
obj.ws.removeAllListeners();
obj.relayActive = false;
delete obj.termSize;
delete obj.cookie;
delete obj.ws;
};
// Start the looppback server
function startRelayConnection(authCookie) {
try {
// Setup the correct URL with domain and use TLS only if needed.
var options = { rejectUnauthorized: false };
if (domain.dns != null) { options.servername = domain.dns; }
var protocol = 'wss';
if (args.tlsoffload) { protocol = 'ws'; }
var domainadd = '';
if ((domain.dns == null) && (domain.id != '')) { domainadd = domain.id + '/' }
var url = protocol + '://127.0.0.1:' + args.port + '/' + domainadd + ((obj.mtype == 3) ? 'local' : 'mesh') + 'relay.ashx?noping=1&p=11&auth=' + authCookie // Protocol 11 is Web-SSH
parent.parent.debug('relay', 'SSH: Connection websocket to ' + url);
obj.wsClient = new WebSocket(url, options);
obj.wsClient.on('open', function () { parent.parent.debug('relay', 'SSH: Relay websocket open'); });
obj.wsClient.on('message', function (data) { // Make sure to handle flow control.
if ((obj.relayActive == false) && (data == 'c')) {
obj.relayActive = true;
// Create a serial tunnel && SSH module
obj.ser = new SerialTunnel();
const Client = require('ssh2').Client;
obj.sshClient = new Client();
obj.sshClient.on('ready', function () { // Authentication was successful.
obj.sshClient.shell(function (err, stream) { // Start a remote shell
if (err) { obj.close(); return; }
obj.sshShell = stream;
obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width);
obj.sshShell.on('close', function () { obj.close(); });
obj.sshShell.on('data', function (data) { obj.ws.send('~' + data.toString()); });
});
obj.ws.send('c');
});
obj.sshClient.on('error', function (err) {
if (err.level == 'client-authentication') { obj.ws.send(JSON.stringify({ action: 'autherror' })); }
obj.close();
});
// Setup the serial tunnel, SSH ---> Relay WS
obj.ser.forwardwrite = function (data) { if ((data.length > 0) && (obj.wsClient != null)) { try { obj.wsClient.send(data); } catch (ex) { } } };
// Connect the SSH module to the serial tunnel
var connectionOptions = { sock: obj.ser }
if (typeof obj.username == 'string') { connectionOptions.username = obj.username; delete obj.username; }
if (typeof obj.password == 'string') { connectionOptions.password = obj.password; delete obj.password; }
obj.sshClient.connect(connectionOptions);
// We are all set, start receiving data
ws._socket.resume();
} else {
// Relay WS --> SSH
if ((data.length > 0) && (obj.ser != null)) { try { obj.ser.updateBuffer(data); } catch (ex) { console.log(ex); } }
}
});
obj.wsClient.on('close', function () { parent.parent.debug('relay', 'SSH: Relay websocket closed'); obj.close(); });
obj.wsClient.on('error', function (err) { parent.parent.debug('relay', 'SSH: Relay websocket error: ' + err); obj.close(); });
} catch (ex) {
console.log(ex);
}
}
// When data is received from the web socket
// SSH default port is 22
ws.on('message', function (msg) {
try {
if (typeof msg != 'string') return;
if (msg[0] == '{') {
// Control data
msg = JSON.parse(msg);
if (typeof msg.action != 'string') return;
switch (msg.action) {
case 'sshauth': {
// TODO: Verify inputs
obj.termSize = msg;
obj.username = msg.username;
obj.password = msg.password;
// Create a mesh relay authentication cookie
var cookieContent = { userid: user._id, domainid: user.domain, nodeid: obj.nodeid, tcpport: obj.tcpport };
if (obj.mtype == 3) { cookieContent.lc = 1; } // This is a local device
startRelayConnection(parent.parent.encodeCookie(cookieContent, parent.parent.loginCookieEncryptionKey));
break;
}
case 'resize': {
obj.termSize = msg;
if (obj.sshShell != null) { obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width); }
break;
}
}
} else if (msg[0] == '~') {
// Terminal data
if (obj.sshShell != null) { obj.sshShell.write(msg.substring(1)); }
}
} catch (ex) { obj.close(); }
});
// If error, do nothing
ws.on('error', function (err) { parent.parent.debug('relay', 'SSH: Browser websocket error: ' + err); obj.close(); });
// If the web socket is closed
ws.on('close', function (req) { parent.parent.debug('relay', 'SSH: Browser websocket closed'); obj.close(); });
// Decode the authentication cookie
var userCookie = parent.parent.decodeCookie(req.query.auth, parent.parent.loginCookieEncryptionKey);
if ((userCookie == null) || (userCookie.a != null)) { obj.close(); return; } // Invalid cookie
// Fetch the user
var user = parent.users[userCookie.userid]
if (user == null) { obj.close(); return; } // Invalid userid
// Check that we have a nodeid
if (req.query.nodeid == null) { obj.close(); return; } // Invalid nodeid
parent.GetNodeWithRights(domain, user, req.query.nodeid, function (node, rights, visible) {
// Check permissions
if ((rights & 8) == 0) { obj.close(); return; } // No MESHRIGHT_REMOTECONTROL rights
if ((rights != 0xFFFFFFFF) && (rights & 0x00000200)) { obj.close(); return; } // MESHRIGHT_NOTERMINAL is set
obj.mtype = node.mtype; // Store the device group type
obj.nodeid = node._id; // Store the NodeID
// Check the SSH port
obj.tcpport = 22;
if (typeof node.sshport == 'number') { obj.tcpport = node.sshport; }
// We are all set, start receiving data
ws._socket.resume();
// Send a request for SSH authentication
try { ws.send(JSON.stringify({ action:'sshauth' })) } catch (ex) { }
});
return obj;
};