440 lines
22 KiB
JavaScript
440 lines
22 KiB
JavaScript
/**
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* @description MeshCentral Intel(R) AMT Interceptor
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* @author Ylian Saint-Hilaire
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* @copyright Intel Corporation 2018
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* @license Apache-2.0
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* @version v0.0.3
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*/
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const crypto = require('crypto');
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const common = require('./common.js');
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var HttpInterceptorAuthentications = {};
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var RedirInterceptorAuthentications = {};
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// Construct a HTTP interceptor object
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module.exports.CreateHttpInterceptor = function (args) {
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var obj = {};
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// Create a random hex string of a given length
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obj.randomValueHex = function (len) { return crypto.randomBytes(Math.ceil(len / 2)).toString('hex').slice(0, len); }
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obj.args = args;
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obj.amt = { acc: "", mode: 0, count: 0, error: false }; // mode: 0:Header, 1:LengthBody, 2:ChunkedBody, 3:UntilClose
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obj.ws = { acc: "", mode: 0, count: 0, error: false, authCNonce: obj.randomValueHex(10), authCNonceCount: 1 };
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obj.blockAmtStorage = false;
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// Private method
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obj.Debug = function (msg) { console.log(msg); }
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// Process data coming from Intel AMT
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obj.processAmtData = function (data) {
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obj.amt.acc += data; // Add data to accumulator
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data = "";
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var datalen = 0;
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do {
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datalen = data.length;
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data += obj.processAmtDataEx();
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} while (datalen != data.length); // Process as much data as possible
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return data;
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}
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// Process data coming from AMT in the accumulator
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obj.processAmtDataEx = function () {
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if (obj.amt.mode == 0) { // Header Mode
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// Decode the HTTP header
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var headerend = obj.amt.acc.indexOf('\r\n\r\n');
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if (headerend < 0) return "";
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var headerlines = obj.amt.acc.substring(0, headerend).split('\r\n');
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obj.amt.acc = obj.amt.acc.substring(headerend + 4);
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obj.amt.directive = headerlines[0].split(' ');
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var headers = headerlines.slice(1);
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obj.amt.headers = {};
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obj.amt.mode = 3; // UntilClose
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for (var i in headers) {
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var j = headers[i].indexOf(':');
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if (j > 0) {
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var v1 = headers[i].substring(0, j).trim().toLowerCase();
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var v2 = headers[i].substring(j + 1).trim();
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obj.amt.headers[v1] = v2;
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if (v1.toLowerCase() == 'www-authenticate') {
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HttpInterceptorAuthentications[obj.args.host + ':' + obj.args.port] = v2;
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} else if (v1.toLowerCase() == 'content-length') {
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obj.amt.count = parseInt(v2);
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if (obj.amt.count > 0) {
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obj.amt.mode = 1; // LengthBody
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} else {
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obj.amt.mode = 0; // Header
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}
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} else if (v1.toLowerCase() == 'transfer-encoding' && v2.toLowerCase() == 'chunked') {
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obj.amt.mode = 2; // ChunkedBody
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}
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}
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}
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// Reform the HTTP header
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var r = obj.amt.directive.join(' ') + '\r\n';
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for (var i in obj.amt.headers) { r += (i + ': ' + obj.amt.headers[i] + '\r\n'); }
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r += '\r\n';
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return r;
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} else if (obj.amt.mode == 1) { // Length Body Mode
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// Send the body of content-length size
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var rl = obj.amt.count;
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if (rl < obj.amt.acc.length) rl = obj.amt.acc.length;
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var r = obj.amt.acc.substring(0, rl);
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obj.amt.acc = obj.amt.acc.substring(rl);
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obj.amt.count -= rl;
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if (obj.amt.count == 0) { obj.amt.mode = 0; }
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return r;
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} else if (obj.amt.mode == 2) { // Chunked Body Mode
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// Send data one chunk at a time
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var headerend = obj.amt.acc.indexOf('\r\n');
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if (headerend < 0) return "";
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var chunksize = parseInt(obj.amt.acc.substring(0, headerend), 16);
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if ((chunksize == 0) && (obj.amt.acc.length >= headerend + 4)) {
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// Send the ending chunk (NOTE: We do not support trailing headers)
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var r = obj.amt.acc.substring(0, headerend + 4);
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obj.amt.acc = obj.amt.acc.substring(headerend + 4);
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obj.amt.mode = 0;
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return r;
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} else if ((chunksize > 0) && (obj.amt.acc.length >= (headerend + 4 + chunksize))) {
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// Send a chunk
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var r = obj.amt.acc.substring(0, headerend + chunksize + 4);
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obj.amt.acc = obj.amt.acc.substring(headerend + chunksize + 4);
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return r;
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}
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} else if (obj.amt.mode == 3) { // Until Close Mode
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var r = obj.amt.acc;
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obj.amt.acc = "";
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return r;
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}
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return "";
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}
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// Process data coming from the Browser
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obj.processBrowserData = function (data) {
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obj.ws.acc += data; // Add data to accumulator
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data = "";
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var datalen = 0;
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do {
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datalen = data.length;
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data += obj.processBrowserDataEx();
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} while (datalen != data.length); // Process as much data as possible
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return data;
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}
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// Process data coming from the Browser in the accumulator
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obj.processBrowserDataEx = function () {
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if (obj.ws.mode == 0) { // Header Mode
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// Decode the HTTP header
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var headerend = obj.ws.acc.indexOf('\r\n\r\n');
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if (headerend < 0) return "";
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var headerlines = obj.ws.acc.substring(0, headerend).split('\r\n');
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obj.ws.acc = obj.ws.acc.substring(headerend + 4);
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obj.ws.directive = headerlines[0].split(' ');
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// If required, block access to amt-storage. This is needed when web storage is not supported on CIRA.
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if ((obj.blockAmtStorage == true) && (obj.ws.directive.length > 1) && (obj.ws.directive[1].indexOf('/amt-storage') == 0)) { obj.ws.directive[1] = obj.ws.directive[1].replace('/amt-storage', '/amt-dummy-storage'); }
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var headers = headerlines.slice(1);
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obj.ws.headers = {};
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obj.ws.mode = 3; // UntilClose
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for (var i in headers) {
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var j = headers[i].indexOf(':');
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if (j > 0) {
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var v1 = headers[i].substring(0, j).trim().toLowerCase();
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var v2 = headers[i].substring(j + 1).trim();
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obj.ws.headers[v1] = v2;
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if (v1.toLowerCase() == 'www-authenticate') {
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HttpInterceptorAuthentications[obj.args.host + ':' + obj.args.port] = v2;
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} else if (v1.toLowerCase() == 'content-length') {
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obj.ws.count = parseInt(v2);
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if (obj.ws.count > 0) {
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obj.ws.mode = 1; // LengthBody
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} else {
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obj.ws.mode = 0; // Header
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}
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} else if (v1.toLowerCase() == 'transfer-encoding' && v2.toLowerCase() == 'chunked') {
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obj.ws.mode = 2; // ChunkedBody
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}
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}
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}
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// Insert authentication
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if (obj.args.user && obj.args.pass && HttpInterceptorAuthentications[obj.args.host + ':' + obj.args.port]) {
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// We have authentication data, lets use it.
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var AuthArgs = obj.GetAuthArgs(HttpInterceptorAuthentications[obj.args.host + ':' + obj.args.port]);
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var hash = obj.ComputeDigesthash(obj.args.user, obj.args.pass, AuthArgs.realm, obj.ws.directive[0], obj.ws.directive[1], AuthArgs.qop, AuthArgs.nonce, obj.ws.authCNonceCount, obj.ws.authCNonce);
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var authstr = 'Digest username="' + obj.args.user + '",realm="' + AuthArgs.realm + '",nonce="' + AuthArgs.nonce + '",uri="' + obj.ws.directive[1] + '",qop=' + AuthArgs.qop + ',nc=' + obj.ws.authCNonceCount + ',cnonce="' + obj.ws.authCNonce + '",response="' + hash + '"';
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if (AuthArgs.opaque) { authstr += ',opaque="' + AuthArgs.opaque + '"'}
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obj.ws.headers.authorization = authstr;
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obj.ws.authCNonceCount++;
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} else {
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// We don't have authentication, clear it out of the header if needed.
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if (obj.ws.headers.authorization) { delete obj.ws.headers.authorization; }
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}
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// Reform the HTTP header
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var r = obj.ws.directive.join(' ') + '\r\n';
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for (var i in obj.ws.headers) { r += (i + ': ' + obj.ws.headers[i] + '\r\n'); }
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r += '\r\n';
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return r;
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} else if (obj.ws.mode == 1) { // Length Body Mode
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// Send the body of content-length size
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var rl = obj.ws.count;
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if (rl < obj.ws.acc.length) rl = obj.ws.acc.length;
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var r = obj.ws.acc.substring(0, rl);
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obj.ws.acc = obj.ws.acc.substring(rl);
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obj.ws.count -= rl;
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if (obj.ws.count == 0) { obj.ws.mode = 0; }
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return r;
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} else if (obj.amt.mode == 2) { // Chunked Body Mode
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// Send data one chunk at a time
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var headerend = obj.amt.acc.indexOf('\r\n');
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if (headerend < 0) return "";
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var chunksize = parseInt(obj.amt.acc.substring(0, headerend), 16);
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if (isNaN(chunksize)) { // TODO: Check this path
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// Chunk is not in this batch, move one
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var r = obj.amt.acc.substring(0, headerend + 2);
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obj.amt.acc = obj.amt.acc.substring(headerend + 2);
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// Peek if we next is the end of chunked transfer
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headerend = obj.amt.acc.indexOf('\r\n');
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if (headerend > 0) {
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chunksize = parseInt(obj.amt.acc.substring(0, headerend), 16);
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if (chunksize == 0) { obj.amt.mode = 0; }
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}
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return r;
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} else if (chunksize == 0 && obj.amt.acc.length >= headerend + 4) {
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// Send the ending chunk (NOTE: We do not support trailing headers)
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var r = obj.amt.acc.substring(0, headerend + 4);
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obj.amt.acc = obj.amt.acc.substring(headerend + 4);
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obj.amt.mode = 0;
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return r;
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} else if (chunksize > 0 && obj.amt.acc.length >= headerend + 4) {
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// Send a chunk
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var r = obj.amt.acc.substring(0, headerend + chunksize + 4);
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obj.amt.acc = obj.amt.acc.substring(headerend + chunksize + 4);
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return r;
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}
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} else if (obj.ws.mode == 3) { // Until Close Mode
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var r = obj.ws.acc;
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obj.ws.acc = "";
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return r;
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}
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return "";
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}
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// Parse authentication values from the HTTP header
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obj.GetAuthArgs = function (authheader) {
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var authargs = {};
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var authargsstr = authheader.substring(7).split(',');
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for (var j in authargsstr) {
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var argstr = authargsstr[j];
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var i = argstr.indexOf('=');
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var k = argstr.substring(0, i).trim().toLowerCase();
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var v = argstr.substring(i + 1).trim();
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if (v.substring(0,1) == '\"') { v = v.substring(1, v.length - 1); }
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if (i > 0) authargs[k] = v;
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}
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return authargs;
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}
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// Compute the MD5 digest hash for a set of values
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obj.ComputeDigesthash = function (username, password, realm, method, path, qop, nonce, nc, cnonce) {
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var ha1 = crypto.createHash('md5').update(username + ":" + realm + ":" + password).digest("hex");
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var ha2 = crypto.createHash('md5').update(method + ":" + path).digest("hex");
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return crypto.createHash('md5').update(ha1 + ":" + nonce + ":" + nc + ":" + cnonce + ":" + qop + ":" + ha2).digest("hex");
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}
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return obj;
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}
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// Construct a redirection interceptor object
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module.exports.CreateRedirInterceptor = function (args) {
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var obj = {};
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// Create a random hex string of a given length
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obj.randomValueHex = function (len) { return crypto.randomBytes(Math.ceil(len / 2)).toString('hex').slice(0, len); }
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obj.args = args;
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obj.amt = { acc: "", mode: 0, count: 0, error: false, direct: false};
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obj.ws = { acc: "", mode: 0, count: 0, error: false, direct: false, authCNonce: obj.randomValueHex(10), authCNonceCount: 1 };
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obj.RedirectCommands = { StartRedirectionSession: 0x10, StartRedirectionSessionReply: 0x11, EndRedirectionSession: 0x12, AuthenticateSession: 0x13, AuthenticateSessionReply: 0x14 };
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obj.StartRedirectionSessionReplyStatus = { SUCCESS: 0, TYPE_UNKNOWN: 1, BUSY: 2, UNSUPPORTED: 3, ERROR: 0xFF };
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obj.AuthenticationStatus = { SUCCESS: 0, FALIURE: 1, NOTSUPPORTED: 2 };
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obj.AuthenticationType = { QUERY: 0, USERPASS: 1, KERBEROS: 2, BADDIGEST: 3, DIGEST: 4 };
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// Private method
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obj.Debug = function (msg) { console.log(msg); }
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// Process data coming from Intel AMT
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obj.processAmtData = function (data) {
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obj.amt.acc += data; // Add data to accumulator
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data = "";
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var datalen = 0;
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do { datalen = data.length; data += obj.processAmtDataEx(); } while (datalen != data.length); // Process as much data as possible
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return data;
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}
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// Process data coming from AMT in the accumulator
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obj.processAmtDataEx = function () {
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if (obj.amt.acc.length == 0) return "";
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if (obj.amt.direct == true) {
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var data = obj.amt.acc;
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obj.amt.acc = "";
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return data;
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} else {
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//console.log(obj.amt.acc.charCodeAt(0));
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switch (obj.amt.acc.charCodeAt(0)) {
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case obj.RedirectCommands.StartRedirectionSessionReply: {
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if (obj.amt.acc.length < 4) return "";
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if (obj.amt.acc.charCodeAt(1) == obj.StartRedirectionSessionReplyStatus.SUCCESS) {
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if (obj.amt.acc.length < 13) return "";
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var oemlen = obj.amt.acc.charCodeAt(12);
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if (obj.amt.acc.length < 13 + oemlen) return "";
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var r = obj.amt.acc.substring(0, 13 + oemlen);
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obj.amt.acc = obj.amt.acc.substring(13 + oemlen);
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return r;
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}
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break;
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}
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case obj.RedirectCommands.AuthenticateSessionReply: {
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if (obj.amt.acc.length < 9) return "";
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var l = common.ReadIntX(obj.amt.acc, 5);
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if (obj.amt.acc.length < 9 + l) return "";
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var authstatus = obj.amt.acc.charCodeAt(1);
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var authType = obj.amt.acc.charCodeAt(4);
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if (authType == obj.AuthenticationType.DIGEST && authstatus == obj.AuthenticationStatus.FALIURE) {
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// Grab and keep all authentication parameters
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var realmlen = obj.amt.acc.charCodeAt(9);
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obj.amt.digestRealm = obj.amt.acc.substring(10, 10 + realmlen);
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var noncelen = obj.amt.acc.charCodeAt(10 + realmlen);
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obj.amt.digestNonce = obj.amt.acc.substring(11 + realmlen, 11 + realmlen + noncelen);
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var qoplen = obj.amt.acc.charCodeAt(11 + realmlen + noncelen);
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obj.amt.digestQOP = obj.amt.acc.substring(12 + realmlen + noncelen, 12 + realmlen + noncelen + qoplen);
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}
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else if (authType != obj.AuthenticationType.QUERY && authstatus == obj.AuthenticationStatus.SUCCESS) {
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// Intel AMT relayed that authentication was succesful, go to direct relay mode in both directions.
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obj.ws.direct = true;
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obj.amt.direct = true;
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}
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var r = obj.amt.acc.substring(0, 9 + l);
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obj.amt.acc = obj.amt.acc.substring(9 + l);
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return r;
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}
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default: {
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obj.amt.error = true;
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return "";
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}
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}
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}
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return "";
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}
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// Process data coming from the Browser
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obj.processBrowserData = function (data) {
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obj.ws.acc += data; // Add data to accumulator
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data = "";
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var datalen = 0;
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do { datalen = data.length; data += obj.processBrowserDataEx(); } while (datalen != data.length); // Process as much data as possible
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return data;
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}
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// Process data coming from the Browser in the accumulator
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obj.processBrowserDataEx = function () {
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if (obj.ws.acc.length == 0) return "";
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if (obj.ws.direct == true) {
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var data = obj.ws.acc;
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obj.ws.acc = "";
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return data;
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} else {
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switch (obj.ws.acc.charCodeAt(0)) {
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case obj.RedirectCommands.StartRedirectionSession: {
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if (obj.ws.acc.length < 8) return "";
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var r = obj.ws.acc.substring(0, 8);
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obj.ws.acc = obj.ws.acc.substring(8);
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return r;
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}
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case obj.RedirectCommands.EndRedirectionSession: {
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if (obj.ws.acc.length < 4) return "";
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var r = obj.ws.acc.substring(0, 4);
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obj.ws.acc = obj.ws.acc.substring(4);
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return r;
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}
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case obj.RedirectCommands.AuthenticateSession: {
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if (obj.ws.acc.length < 9) return "";
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var l = common.ReadIntX(obj.ws.acc, 5);
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if (obj.ws.acc.length < 9 + l) return "";
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var authType = obj.ws.acc.charCodeAt(4);
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if (authType == obj.AuthenticationType.DIGEST && obj.args.user && obj.args.pass) {
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var authurl = "/RedirectionService";
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if (obj.amt.digestRealm) {
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// Replace this authentication digest with a server created one
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// We have everything we need to authenticate
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var nc = obj.ws.authCNonceCount;
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obj.ws.authCNonceCount++;
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var digest = obj.ComputeDigesthash(obj.args.user, obj.args.pass, obj.amt.digestRealm, "POST", authurl, obj.amt.digestQOP, obj.amt.digestNonce, nc, obj.ws.authCNonce);
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// Replace this authentication digest with a server created one
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// We have everything we need to authenticate
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var r = String.fromCharCode(0x13, 0x00, 0x00, 0x00, 0x04);
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r += common.IntToStrX(obj.args.user.length + obj.amt.digestRealm.length + obj.amt.digestNonce.length + authurl.length + obj.ws.authCNonce.length + nc.toString().length + digest.length + obj.amt.digestQOP.length + 8);
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r += String.fromCharCode(obj.args.user.length); // Username Length
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r += obj.args.user; // Username
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r += String.fromCharCode(obj.amt.digestRealm.length); // Realm Length
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r += obj.amt.digestRealm; // Realm
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r += String.fromCharCode(obj.amt.digestNonce.length); // Nonce Length
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r += obj.amt.digestNonce; // Nonce
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r += String.fromCharCode(authurl.length); // Authentication URL "/RedirectionService" Length
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r += authurl; // Authentication URL
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r += String.fromCharCode(obj.ws.authCNonce.length); // CNonce Length
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r += obj.ws.authCNonce; // CNonce
|
|
r += String.fromCharCode(nc.toString().length); // NonceCount Length
|
|
r += nc.toString(); // NonceCount
|
|
r += String.fromCharCode(digest.length); // Response Length
|
|
r += digest; // Response
|
|
r += String.fromCharCode(obj.amt.digestQOP.length); // QOP Length
|
|
r += obj.amt.digestQOP; // QOP
|
|
|
|
obj.ws.acc = obj.ws.acc.substring(9 + l); // Don't relay the original message
|
|
return r;
|
|
} else {
|
|
// Replace this authentication digest with a server created one
|
|
// Since we don't have authentication parameters, fill them in with blanks to get an error back what that info.
|
|
var r = String.fromCharCode(0x13, 0x00, 0x00, 0x00, 0x04);
|
|
r += common.IntToStrX(obj.args.user.length + authurl.length + 8);
|
|
r += String.fromCharCode(obj.args.user.length);
|
|
r += obj.args.user;
|
|
r += String.fromCharCode(0x00, 0x00, authurl.length);
|
|
r += authurl;
|
|
r += String.fromCharCode(0x00, 0x00, 0x00, 0x00);
|
|
obj.ws.acc = obj.ws.acc.substring(9 + l); // Don't relay the original message
|
|
return r;
|
|
}
|
|
}
|
|
|
|
var r = obj.ws.acc.substring(0, 9 + l);
|
|
obj.ws.acc = obj.ws.acc.substring(9 + l);
|
|
return r;
|
|
}
|
|
default: {
|
|
obj.ws.error = true;
|
|
return "";
|
|
}
|
|
}
|
|
}
|
|
return "";
|
|
}
|
|
|
|
// Compute the MD5 digest hash for a set of values
|
|
obj.ComputeDigesthash = function (username, password, realm, method, path, qop, nonce, nc, cnonce) {
|
|
var ha1 = crypto.createHash('md5').update(username + ":" + realm + ":" + password).digest("hex");
|
|
var ha2 = crypto.createHash('md5').update(method + ":" + path).digest("hex");
|
|
return crypto.createHash('md5').update(ha1 + ":" + nonce + ":" + nc + ":" + cnonce + ":" + qop + ":" + ha2).digest("hex");
|
|
}
|
|
|
|
return obj;
|
|
} |