mirror of
https://github.com/Ylianst/MeshCentral.git
synced 2025-03-09 15:40:18 +00:00
309 lines
No EOL
16 KiB
JavaScript
309 lines
No EOL
16 KiB
JavaScript
/**
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* @description Intel AMT Redirection Transport Module - using Node
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* @author Ylian Saint-Hilaire
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* @version v0.0.1f
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*/
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// Construct a MeshServer object
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module.exports = function CreateAmtRedirect(module) {
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var obj = {};
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obj.m = module; // This is the inner module (Terminal or Desktop)
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module.parent = obj;
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obj.State = 0;
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obj.net = require('net');
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obj.tls = require('tls');
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obj.socket = null;
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obj.host = null;
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obj.port = 0;
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obj.user = null;
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obj.pass = null;
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obj.connectstate = 0;
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obj.protocol = module.protocol; // 1 = SOL, 2 = KVM, 3 = IDER
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obj.xtlsoptions = null;
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obj.amtaccumulator = Buffer.alloc(0);
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obj.amtsequence = 1;
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obj.amtkeepalivetimer = null;
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obj.authuri = '/RedirectionService';
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obj.digestRealmMatch = null;
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obj.onStateChanged = null;
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// Private method
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obj.Debug = function (msg) { console.log(msg); }
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var urlvars = null;
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obj.Start = function (host, port, user, pass, tls, tlsFingerprint, tlsoptions) {
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obj.host = host;
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obj.port = port;
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obj.user = user;
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obj.pass = pass;
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obj.xtls = tls;
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obj.xtlsoptions = tlsoptions;
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obj.xtlsFingerprint = tlsFingerprint;
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obj.connectstate = 0;
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if (tls == true) {
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obj.socket = obj.tls.connect({ host: host, port: port, rejectUnauthorized: false, checkServerIdentity: obj.onCheckServerIdentity }, obj.xxOnSocketConnected);
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} else {
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obj.socket = obj.net.createConnection({ host: host, port: port }, obj.xxOnSocketConnected);
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}
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obj.socket.on('data', obj.xxOnSocketData);
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obj.socket.on('close', obj.xxOnSocketClosed);
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obj.socket.on('error', obj.xxOnSocketClosed);
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obj.xxStateChange(1);
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}
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// Get the certificate of Intel AMT
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//obj.getPeerCertificate = function () { if (obj.xtls == true) { return obj.socket.getPeerCertificate(); } return null; }
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obj.onCheckServerIdentity = function (cert) {
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var f = cert[0].fingerprint.split(':').join('').toLowerCase();
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if ((obj.xtlsFingerprint != null) && (obj.xtlsFingerprint != f)) {
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console.log('Invalid TLS Cert, SHA384: ' + f);
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process.exit(2);
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return;
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} else {
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if (obj.xtlsFingerprint == null) {
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obj.xtlsFingerprint = f;
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console.log('TLS Cert SHA384: ' + f);
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}
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}
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}
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obj.xxOnSocketConnected = function () {
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if (obj.socket == null) return;
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/*
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if (obj.xtls == true) {
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obj.xtlsCertificate = obj.socket.getPeerCertificate();
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if ((obj.xtlsFingerprint != 0) && (obj.xtlsCertificate.fingerprint.split(':').join('').toLowerCase() != obj.xtlsFingerprint)) { obj.Stop(); return; }
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}
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*/
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if (urlvars && urlvars['redirtrace']) { console.log('REDIR-CONNECTED'); }
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//obj.Debug("Socket Connected");
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obj.xxStateChange(2);
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if (obj.protocol == 1) obj.xxSend(obj.RedirectStartSol); // TODO: Put these strings in higher level module to tighten code
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else if (obj.protocol == 2) obj.xxSend(obj.RedirectStartKvm); // Don't need these is the feature if not compiled-in.
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else if (obj.protocol == 3) obj.xxSend(obj.RedirectStartIder);
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}
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obj.xxOnSocketData = function (data) {
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if (!data || obj.connectstate == -1) return;
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if (urlvars && urlvars['redirtrace']) { console.log('REDIR-RECV(' + data.length + '): ' + data.toString('hex')); }
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//obj.Debug("Recv(" + data.length + "): " + rstr2hex(data));
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if ((obj.protocol == 2 || obj.protocol == 3) && obj.connectstate == 1) { return obj.m.ProcessData(data); } // KVM or IDER traffic, forward it directly.
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obj.amtaccumulator = Buffer.concat([obj.amtaccumulator, data]);
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//obj.Debug("Recv(" + obj.amtaccumulator.length + "): " + obj.amtaccumulator.toString('hex'));
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while (obj.amtaccumulator.length > 0) {
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var cmdsize = 0;
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//console.log('CMD: ' + obj.amtaccumulator[0]);
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switch (obj.amtaccumulator[0]) {
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case 0x11: // StartRedirectionSessionReply (17)
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if (obj.amtaccumulator.length < 4) return;
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var statuscode = obj.amtaccumulator[1];
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switch (statuscode) {
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case 0: // STATUS_SUCCESS
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if (obj.amtaccumulator.length < 13) return;
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var oemlen = obj.amtaccumulator[12];
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if (obj.amtaccumulator.length < 13 + oemlen) return;
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obj.xxSend(String.fromCharCode(0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)); // Query authentication support
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cmdsize = (13 + oemlen);
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break;
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default:
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obj.Stop();
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break;
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}
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break;
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case 0x14: // AuthenticateSessionReply (20)
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if (obj.amtaccumulator.length < 9) return;
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var authDataLen = obj.amtaccumulator.readInt32LE(5);
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if (obj.amtaccumulator.length < 9 + authDataLen) return;
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var status = obj.amtaccumulator[1];
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var authType = obj.amtaccumulator[4];
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var authData = [];
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for (i = 0; i < authDataLen; i++) { authData.push(obj.amtaccumulator[9 + i]); }
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var authDataBuf = obj.amtaccumulator.slice(9, 9 + authDataLen);
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cmdsize = 9 + authDataLen;
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if (authType == 0) {
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// Query
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if (authData.indexOf(4) >= 0) {
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// Good Digest Auth (With cnonce and all)
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obj.xxSend(String.fromCharCode(0x13, 0x00, 0x00, 0x00, 0x04) + IntToStrX(obj.user.length + obj.authuri.length + 8) + String.fromCharCode(obj.user.length) + obj.user + String.fromCharCode(0x00, 0x00) + String.fromCharCode(obj.authuri.length) + obj.authuri + String.fromCharCode(0x00, 0x00, 0x00, 0x00));
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}
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/*
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else if (authData.indexOf(3) >= 0) {
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// Bad Digest Auth (Not sure why this is supported, cnonce is not used!)
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obj.xxSend(String.fromCharCode(0x13, 0x00, 0x00, 0x00, 0x03) + IntToStrX(obj.user.length + obj.authuri.length + 7) + String.fromCharCode(obj.user.length) + obj.user + String.fromCharCode(0x00, 0x00) + String.fromCharCode(obj.authuri.length) + obj.authuri + String.fromCharCode(0x00, 0x00, 0x00));
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}
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else if (authData.indexOf(1) >= 0) {
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// Basic Auth (Probably a good idea to not support this unless this is an old version of Intel AMT)
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obj.xxSend(String.fromCharCode(0x13, 0x00, 0x00, 0x00, 0x01) + IntToStrX(obj.user.length + obj.pass.length + 2) + String.fromCharCode(obj.user.length) + obj.user + String.fromCharCode(obj.pass.length) + obj.pass);
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}
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*/
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else obj.Stop();
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}
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else if ((authType == 3 || authType == 4) && status == 1) {
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var curptr = 0;
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// Realm
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var realmlen = authDataBuf[curptr];
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var realm = authDataBuf.slice(curptr + 1, curptr + 1 + realmlen).toString();
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curptr += (realmlen + 1);
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// Check the digest realm. If it does not match, close the connection.
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if (obj.digestRealmMatch && (obj.digestRealmMatch != realm)) { obj.Stop(); return; }
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// Nonce
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var noncelen = authDataBuf[curptr];
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var nonce = authDataBuf.slice(curptr + 1, curptr + 1 + noncelen).toString();
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curptr += (noncelen + 1);
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// QOP
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var qoplen = 0;
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var qop = null;
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var cnonce = obj.xxRandomValueHex(32);
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var snc = '00000002';
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var extra = '';
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if (authType == 4) {
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qoplen = authDataBuf[curptr];
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qop = authDataBuf.slice(curptr + 1, curptr + 1 + qoplen).toString();
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curptr += (qoplen + 1);
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extra = snc + ':' + cnonce + ':' + qop + ':';
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}
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var digest = hex_md5(hex_md5(obj.user + ':' + realm + ':' + obj.pass) + ':' + nonce + ':' + extra + hex_md5('POST:' + obj.authuri));
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var totallen = obj.user.length + realm.length + nonce.length + obj.authuri.length + cnonce.length + snc.length + digest.length + 7;
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if (authType == 4) totallen += (qop.length + 1);
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var buf = Buffer.concat([new Buffer([0x13, 0x00, 0x00, 0x00, authType]), new Buffer([totallen & 0xFF, (totallen >> 8) & 0xFF, 0x00, 0x00]), new Buffer([obj.user.length]), new Buffer(obj.user), new Buffer([realm.length]), new Buffer(realm), new Buffer([nonce.length]), new Buffer(nonce), new Buffer([obj.authuri.length]), new Buffer(obj.authuri), new Buffer([cnonce.length]), new Buffer(cnonce), new Buffer([snc.length]), new Buffer(snc), new Buffer([digest.length]), new Buffer(digest)]);
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if (authType == 4) buf = Buffer.concat([buf, new Buffer([qop.length]), new Buffer(qop) ]);
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obj.xxSend(buf);
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}
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else if (status == 0) { // Success
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if (obj.protocol == 1) {
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// Serial-over-LAN: Send Intel AMT serial settings...
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var MaxTxBuffer = 10000;
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var TxTimeout = 100;
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var TxOverflowTimeout = 0;
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var RxTimeout = 10000;
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var RxFlushTimeout = 100;
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var Heartbeat = 0;//5000;
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obj.xxSend(String.fromCharCode(0x20, 0x00, 0x00, 0x00) + ToIntStr(obj.amtsequence++) + ToShortStr(MaxTxBuffer) + ToShortStr(TxTimeout) + ToShortStr(TxOverflowTimeout) + ToShortStr(RxTimeout) + ToShortStr(RxFlushTimeout) + ToShortStr(Heartbeat) + ToIntStr(0));
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}
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if (obj.protocol == 2) {
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// Remote Desktop: Send traffic directly...
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obj.xxSend(new Buffer([0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]));
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}
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if (obj.protocol == 3) {
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// Remote IDER: Send traffic directly...
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obj.connectstate = 1;
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obj.xxStateChange(3);
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}
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} else obj.Stop();
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break;
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case 0x21: // Response to settings (33)
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if (obj.amtaccumulator.length < 23) break;
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cmdsize = 23;
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obj.xxSend(String.fromCharCode(0x27, 0x00, 0x00, 0x00) + ToIntStr(obj.amtsequence++) + String.fromCharCode(0x00, 0x00, 0x1B, 0x00, 0x00, 0x00));
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if (obj.protocol == 1) { obj.amtkeepalivetimer = setInterval(obj.xxSendAmtKeepAlive, 2000); }
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obj.connectstate = 1;
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obj.xxStateChange(3);
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break;
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case 0x29: // Serial Settings (41)
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if (obj.amtaccumulator.length < 10) break;
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cmdsize = 10;
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break;
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case 0x2A: // Incoming display data (42)
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if (obj.amtaccumulator.length < 10) break;
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var cs = (10 + ((obj.amtaccumulator[9] & 0xFF) << 8) + (obj.amtaccumulator[8] & 0xFF));
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if (obj.amtaccumulator.length < cs) break;
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obj.m.ProcessData(obj.amtaccumulator.slice(10, cs));
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cmdsize = cs;
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break;
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case 0x2B: // Keep alive message (43)
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if (obj.amtaccumulator.length < 8) break;
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cmdsize = 8;
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break;
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case 0x41:
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if (obj.amtaccumulator.length < 8) break;
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obj.connectstate = 1;
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obj.m.Start();
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// KVM traffic, forward rest of accumulator directly.
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if (obj.amtaccumulator.length > 8) { obj.m.ProcessData(obj.amtaccumulator.substring(8)); }
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cmdsize = obj.amtaccumulator.length;
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break;
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default:
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console.log('Unknown Intel AMT command: ' + obj.amtaccumulator[0] + ' acclen=' + obj.amtaccumulator.length);
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obj.Stop();
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return;
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}
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if (cmdsize == 0) return;
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obj.amtaccumulator = obj.amtaccumulator.slice(cmdsize);
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}
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}
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obj.xxSend = function (x) {
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if (urlvars && urlvars['redirtrace']) { console.log('REDIR-SEND(' + x.length + '): ' + rstr2hex(x)); }
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//obj.Debug('Send(' + x.length + '): ' + Buffer.from(x, 'binary').toString('hex'));
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if (typeof x == 'string') { obj.socket.write(Buffer.from(x, 'binary')); } else { obj.socket.write(x); }
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}
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// Send Serial-over-LAN ASCII characters
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obj.Send = function (x) {
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if (obj.socket == null || obj.connectstate != 1) return;
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if (obj.protocol == 1) { obj.xxSend(String.fromCharCode(0x28, 0x00, 0x00, 0x00) + ToIntStr(obj.amtsequence++) + ToShortStr(x.length) + x); } else { obj.xxSend(x); }
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}
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obj.xxSendAmtKeepAlive = function () {
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if (obj.socket == null) return;
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obj.xxSend(String.fromCharCode(0x2B, 0x00, 0x00, 0x00) + ToIntStr(obj.amtsequence++));
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}
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// Uses OpenSSL random to generate a hex string
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obj.xxRandomValueHex = function (len) {
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var t = [], l = Math.floor(len / 2);
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for (var i = 0; i < l; i++) { t.push(obj.tls.generateRandomInteger('0', '255')); }
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return new Buffer(t).toString('hex');
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}
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obj.xxOnSocketClosed = function () {
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obj.socket = null;
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if (urlvars && urlvars['redirtrace']) { console.log('REDIR-CLOSED'); }
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//obj.Debug('Socket Closed');
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obj.Stop();
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}
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obj.xxStateChange = function(newstate) {
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if (obj.State == newstate) return;
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obj.State = newstate;
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obj.m.xxStateChange(obj.State);
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if (obj.onStateChanged != null) obj.onStateChanged(obj, obj.State);
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}
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obj.Stop = function () {
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if (urlvars && urlvars['redirtrace']) { console.log('REDIR-CLOSED'); }
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//obj.Debug('Socket Stopped');
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obj.xxStateChange(0);
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obj.connectstate = -1;
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obj.amtaccumulator = Buffer.alloc(0);
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if (obj.socket != null) { obj.socket.destroy(); obj.socket = null; }
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if (obj.amtkeepalivetimer != null) { clearInterval(obj.amtkeepalivetimer); obj.amtkeepalivetimer = null; }
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}
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obj.RedirectStartSol = new Buffer([0x10, 0x00, 0x00, 0x00, 0x53, 0x4F, 0x4C, 0x20]);
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obj.RedirectStartKvm = new Buffer([0x10, 0x01, 0x00, 0x00, 0x4b, 0x56, 0x4d, 0x52]);
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obj.RedirectStartIder = new Buffer([0x10, 0x00, 0x00, 0x00, 0x49, 0x44, 0x45, 0x52]);
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return obj;
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}
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function ToIntStr(v) { return String.fromCharCode((v & 0xFF), ((v >> 8) & 0xFF), ((v >> 16) & 0xFF), ((v >> 24) & 0xFF)); }
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function ToShortStr(v) { return String.fromCharCode((v & 0xFF), ((v >> 8) & 0xFF)); }
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function ShortToStr(v) { return String.fromCharCode((v >> 8) & 0xFF, v & 0xFF); }
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function ShortToStrX(v) { return String.fromCharCode(v & 0xFF, (v >> 8) & 0xFF); }
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function IntToStr(v) { return String.fromCharCode((v >> 24) & 0xFF, (v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF); }
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function IntToStrX(v) { return String.fromCharCode(v & 0xFF, (v >> 8) & 0xFF, (v >> 16) & 0xFF, (v >> 24) & 0xFF); }
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var md5hasher = require('MD5Stream').create();
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function hex_md5(a) { return md5hasher.syncHash(a).toString('hex').toLowerCase(); } |