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https://github.com/Ylianst/MeshCentral.git
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Added SSH support in terminal tab for local devices.
This commit is contained in:
Ylian Saint-Hilaire
parent
e44ed5be4f
commit
9b85a51f67
6 changed files with 273 additions and 19 deletions
202
apprelays.js
202
apprelays.js
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@ -229,6 +229,7 @@ module.exports.CreateSshRelay = function (parent, db, ws, req, args, domain) {
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// Decode the authentication cookie
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obj.cookie = parent.parent.decodeCookie(req.query.auth, parent.parent.loginCookieEncryptionKey);
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if (obj.cookie == null) { obj.ws.send(JSON.stringify({ action: 'sessionerror' })); obj.close(); return; }
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console.log(obj.cookie);
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// Start the looppback server
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function startRelayConnection() {
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@ -258,7 +259,7 @@ module.exports.CreateSshRelay = function (parent, db, ws, req, args, domain) {
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obj.sshShell = stream;
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obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width);
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obj.sshShell.on('close', function () { obj.close(); });
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obj.sshShell.on('data', function (data) { obj.ws.send('~' + data); });
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obj.sshShell.on('data', function (data) { obj.ws.send('~' + data.toString()); });
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});
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obj.ws.send(JSON.stringify({ action: 'connected' }));
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});
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@ -301,6 +302,7 @@ module.exports.CreateSshRelay = function (parent, db, ws, req, args, domain) {
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if (typeof msg.action != 'string') return;
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switch (msg.action) {
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case 'connect': {
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// TODO: Verify inputs
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obj.termSize = msg;
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obj.username = msg.username;
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obj.password = msg.password;
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@ -327,4 +329,200 @@ module.exports.CreateSshRelay = function (parent, db, ws, req, args, domain) {
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ws.on('close', function (req) { parent.parent.debug('relay', 'SSH: Browser websocket closed'); obj.close(); });
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return obj;
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};
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};
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// Construct a SSH Terminal Relay object, called upon connection
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module.exports.CreateSshTerminalRelay = function (parent, db, ws, req, domain, user, cookie, args) {
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const Net = require('net');
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const WebSocket = require('ws');
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// SerialTunnel object is used to embed SSH within another connection.
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function SerialTunnel(options) {
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var obj = new require('stream').Duplex(options);
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obj.forwardwrite = null;
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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;
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}
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const obj = {};
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obj.ws = ws;
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obj.relayActive = false;
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parent.parent.debug('relay', 'SSH: Request for SSH relay (' + req.clientIp + ')');
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// Disconnect
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obj.close = function (arg) {
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if (obj.ws == null) return;
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// Collect how many raw bytes where received and sent.
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// We sum both the websocket and TCP client in this case.
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//var inTraffc = obj.ws._socket.bytesRead, outTraffc = obj.ws._socket.bytesWritten;
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//if (obj.wsClient != null) { inTraffc += obj.wsClient._socket.bytesRead; outTraffc += obj.wsClient._socket.bytesWritten; }
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//console.log('WinSSH - in', inTraffc, 'out', outTraffc);
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if (obj.sshShell) {
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obj.sshShell.destroy();
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obj.sshShell.removeAllListeners('data');
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obj.sshShell.removeAllListeners('close');
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try { obj.sshShell.end(); } catch (ex) { console.log(ex); }
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delete obj.sshShell;
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}
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if (obj.sshClient) {
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obj.sshClient.destroy();
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obj.sshClient.removeAllListeners('ready');
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try { obj.sshClient.end(); } catch (ex) { console.log(ex); }
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delete obj.sshClient;
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}
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if (obj.wsClient) {
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obj.wsClient.removeAllListeners('open');
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obj.wsClient.removeAllListeners('message');
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obj.wsClient.removeAllListeners('close');
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try { obj.wsClient.close(); } catch (ex) { console.log(ex); }
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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
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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();
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obj.relayActive = false;
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delete obj.termSize;
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delete obj.cookie;
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delete obj.ws;
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};
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// Start the looppback server
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function startRelayConnection(authCookie) {
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try {
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// Setup the correct URL with domain and use TLS only if needed.
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var options = { rejectUnauthorized: false };
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if (domain.dns != null) { options.servername = domain.dns; }
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var protocol = 'wss';
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if (args.tlsoffload) { protocol = 'ws'; }
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var domainadd = '';
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if ((domain.dns == null) && (domain.id != '')) { domainadd = domain.id + '/' }
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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
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parent.parent.debug('relay', 'SSH: Connection websocket to ' + url);
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obj.wsClient = new WebSocket(url, options);
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obj.wsClient.on('open', function () { parent.parent.debug('relay', 'SSH: Relay websocket open'); });
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obj.wsClient.on('message', function (data) { // Make sure to handle flow control.
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if ((obj.relayActive == false) && (data == 'c')) {
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obj.relayActive = true;
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// Create a serial tunnel && SSH module
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obj.ser = new SerialTunnel();
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const Client = require('ssh2').Client;
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obj.sshClient = new Client();
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obj.sshClient.on('ready', function () { // Authentication was successful.
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obj.sshClient.shell(function (err, stream) { // Start a remote shell
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if (err) { obj.close(); return; }
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obj.sshShell = stream;
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obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width);
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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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});
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obj.ws.send('c');
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});
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obj.sshClient.on('error', function (err) {
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if (err.level == 'client-authentication') { obj.ws.send(JSON.stringify({ action: 'autherror' })); }
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obj.close();
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});
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// Setup the serial tunnel, SSH ---> Relay WS
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obj.ser.forwardwrite = function (data) { if ((data.length > 0) && (obj.wsClient != null)) { try { obj.wsClient.send(data); } catch (ex) { } } };
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// Connect the SSH module to the serial tunnel
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var connectionOptions = { sock: obj.ser }
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if (typeof obj.username == 'string') { connectionOptions.username = obj.username; delete obj.username; }
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if (typeof obj.password == 'string') { connectionOptions.password = obj.password; delete obj.password; }
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obj.sshClient.connect(connectionOptions);
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// We are all set, start receiving data
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ws._socket.resume();
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} else {
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// Relay WS --> SSH
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if ((data.length > 0) && (obj.ser != null)) { try { obj.ser.updateBuffer(data); } catch (ex) { console.log(ex); } }
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}
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});
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obj.wsClient.on('close', function () { parent.parent.debug('relay', 'SSH: Relay websocket closed'); obj.close(); });
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obj.wsClient.on('error', function (err) { parent.parent.debug('relay', 'SSH: Relay websocket error: ' + err); obj.close(); });
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} catch (ex) {
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console.log(ex);
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}
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}
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// When data is received from the web socket
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// SSH default port is 22
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ws.on('message', function (msg) {
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try {
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if (typeof msg != 'string') return;
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if (msg[0] == '{') {
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// Control data
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msg = JSON.parse(msg);
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if (typeof msg.action != 'string') return;
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switch (msg.action) {
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case 'sshauth': {
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// TODO: Verify inputs
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obj.termSize = msg;
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obj.username = msg.username;
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obj.password = msg.password;
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// Create a mesh relay authentication cookie
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var cookieContent = { userid: user._id, domainid: user.domain, nodeid: obj.nodeid, tcpport: obj.tcpport };
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if (obj.mtype == 3) { cookieContent.lc = 1; } // This is a local device
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startRelayConnection(parent.parent.encodeCookie(cookieContent, parent.parent.loginCookieEncryptionKey));
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break;
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}
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case 'resize': {
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obj.termSize = msg;
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if (obj.sshShell != null) { obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width); }
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break;
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}
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}
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} else if (msg[0] == '~') {
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// Terminal data
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if (obj.sshShell != null) { obj.sshShell.write(msg.substring(1)); }
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}
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} catch (ex) { obj.close(); }
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});
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// If error, do nothing
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ws.on('error', function (err) { parent.parent.debug('relay', 'SSH: Browser websocket error: ' + err); obj.close(); });
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// If the web socket is closed
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ws.on('close', function (req) { parent.parent.debug('relay', 'SSH: Browser websocket closed'); obj.close(); });
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// Decode the authentication cookie
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var userCookie = parent.parent.decodeCookie(req.query.auth, parent.parent.loginCookieEncryptionKey);
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if ((userCookie == null) || (userCookie.a != null)) { obj.close(); return; } // Invalid cookie
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// Fetch the user
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var user = parent.users[userCookie.userid]
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if (user == null) { obj.close(); return; } // Invalid userid
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// Check that we have a nodeid
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if (req.query.nodeid == null) { obj.close(); return; } // Invalid nodeid
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parent.GetNodeWithRights(domain, user, req.query.nodeid, function (node, rights, visible) {
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// Check permissions
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if ((rights & 8) == 0) { obj.close(); return; } // No MESHRIGHT_REMOTECONTROL rights
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if ((rights != 0xFFFFFFFF) && (rights & 0x00000200)) { obj.close(); return; } // MESHRIGHT_NOTERMINAL is set
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obj.mtype = node.mtype; // Store the device group type
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obj.nodeid = node._id; // Store the NodeID
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// Check the SSH port
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obj.tcpport = 22;
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if (typeof node.sshport == 'number') { obj.tcpport = node.sshport; }
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// We are all set, start receiving data
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ws._socket.resume();
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// Send a request for SSH authentication
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try { ws.send(JSON.stringify({ action:'sshauth' })) } catch (ex) { }
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});
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return obj;
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};
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