var obj = {};

// Create a random hex string of a given length

obj.randomValueHex = function (len) { return crypto.randomBytes(Math.ceil(len / 2)).toString('hex').slice(0, len); };

obj.args = args;

obj.amt = { acc: '', mode: 0, count: 0, error: false }; // mode: 0:Header, 1:LengthBody, 2:ChunkedBody, 3:UntilClose

obj.ws = { acc: '', mode: 0, count: 0, error: false, authCNonce: obj.randomValueHex(10), authCNonceCount: 1 };

obj.blockAmtStorage = false;

// Private method

obj.Debug = function (msg) { console.log(msg); };

// Process data coming from Intel AMT

obj.processAmtData = function (data) {

obj.amt.acc += data.toString('binary'); // Add data to accumulator

data = '';

var datalen = 0;

do { datalen = data.length; data += obj.processAmtDataEx(); } while (datalen != data.length); // Process as much data as possible

return Buffer.from(data, 'binary');

};

// Process data coming from AMT in the accumulator

obj.processAmtDataEx = function () {

var i, r, headerend;

if (obj.amt.mode == 0) { // Header Mode

// Decode the HTTP header

headerend = obj.amt.acc.indexOf('\r\n\r\n');

if (headerend < 0) return '';

var headerlines = obj.amt.acc.substring(0, headerend).split('\r\n');

obj.amt.acc = obj.amt.acc.substring(headerend + 4);

obj.amt.directive = headerlines[0].split(' ');

var headers = headerlines.slice(1);

obj.amt.headers = {};

obj.amt.mode = 3; // UntilClose

for (i in headers) {

var j = headers[i].indexOf(':');

if (j > 0) {

var v1 = headers[i].substring(0, j).trim().toLowerCase();

var v2 = headers[i].substring(j + 1).trim();

obj.amt.headers[v1] = v2;

if (v1.toLowerCase() == 'www-authenticate') {

HttpInterceptorAuthentications[obj.args.host + ':' + obj.args.port] = v2;

} else if (v1.toLowerCase() == 'content-length') {

obj.amt.count = parseInt(v2);

if (obj.amt.count > 0) {

obj.amt.mode = 1; // LengthBody

} else {

obj.amt.mode = 0; // Header

}

} else if (v1.toLowerCase() == 'transfer-encoding' && v2.toLowerCase() == 'chunked') {

obj.amt.mode = 2; // ChunkedBody

}

}

}

// Reform the HTTP header

r = obj.amt.directive.join(' ') + '\r\n';

for (i in obj.amt.headers) { r += (i + ': ' + obj.amt.headers[i] + '\r\n'); }

r += '\r\n';

return r;

} else if (obj.amt.mode == 1) { // Length Body Mode

// Send the body of content-length size

var rl = obj.amt.count;

if (rl < obj.amt.acc.length) rl = obj.amt.acc.length;

r = obj.amt.acc.substring(0, rl);

obj.amt.acc = obj.amt.acc.substring(rl);

obj.amt.count -= rl;

if (obj.amt.count == 0) { obj.amt.mode = 0; }

return r;

} else if (obj.amt.mode == 2) { // Chunked Body Mode

// Send data one chunk at a time

headerend = obj.amt.acc.indexOf('\r\n');

if (headerend < 0) return '';

var chunksize = parseInt(obj.amt.acc.substring(0, headerend), 16);

if ((chunksize == 0) && (obj.amt.acc.length >= headerend + 4)) {

// Send the ending chunk (NOTE: We do not support trailing headers)

r = obj.amt.acc.substring(0, headerend + 4);

obj.amt.acc = obj.amt.acc.substring(headerend + 4);

obj.amt.mode = 0;

return r;

} else if ((chunksize > 0) && (obj.amt.acc.length >= (headerend + 4 + chunksize))) {

// Send a chunk

r = obj.amt.acc.substring(0, headerend + chunksize + 4);

obj.amt.acc = obj.amt.acc.substring(headerend + chunksize + 4);

return r;

}

} else if (obj.amt.mode == 3) { // Until Close Mode

r = obj.amt.acc;

obj.amt.acc = '';

return r;

}

return '';

};

// Process data coming from the Browser

obj.processBrowserData = function (data) {

obj.ws.acc += data.toString('binary'); // Add data to accumulator

data = '';

var datalen = 0;

do { datalen = data.length; data += obj.processBrowserDataEx(); } while (datalen != data.length); // Process as much data as possible

return Buffer.from(data, 'binary');

};

// Process data coming from the Browser in the accumulator

obj.processBrowserDataEx = function () {

var i, r, headerend;

if (obj.ws.mode == 0) { // Header Mode

// Decode the HTTP header

headerend = obj.ws.acc.indexOf('\r\n\r\n');

if (headerend < 0) return '';

var headerlines = obj.ws.acc.substring(0, headerend).split('\r\n');

obj.ws.acc = obj.ws.acc.substring(headerend + 4);

obj.ws.directive = headerlines[0].split(' ');

// If required, block access to amt-storage. This is needed when web storage is not supported on CIRA.

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'); }

var headers = headerlines.slice(1);

obj.ws.headers = {};

obj.ws.mode = 3; // UntilClose

for (i in headers) {

var j = headers[i].indexOf(':');

if (j > 0) {

var v1 = headers[i].substring(0, j).trim().toLowerCase();

var v2 = headers[i].substring(j + 1).trim();

obj.ws.headers[v1] = v2;

if (v1.toLowerCase() == 'www-authenticate') {

HttpInterceptorAuthentications[obj.args.host + ':' + obj.args.port] = v2;

} else if (v1.toLowerCase() == 'content-length') {

obj.ws.count = parseInt(v2);

if (obj.ws.count > 0) {

obj.ws.mode = 1; // LengthBody

} else {

obj.ws.mode = 0; // Header

}

} else if (v1.toLowerCase() == 'transfer-encoding' && v2.toLowerCase() == 'chunked') {

obj.ws.mode = 2; // ChunkedBody

}

}

}

// Insert authentication

if (obj.args.user && obj.args.pass && HttpInterceptorAuthentications[obj.args.host + ':' + obj.args.port]) {

// We have authentication data, lets use it.

var AuthArgs = obj.GetAuthArgs(HttpInterceptorAuthentications[obj.args.host + ':' + obj.args.port]);

// If different QOP options are proposed, always use 'auth' for now.

AuthArgs.qop = 'auth';

// In the future, we should support auth-int, but that will required the body of the request to be accumulated and hashed.

/*

if (AuthArgs.qop != null) { // If Intel AMT supports auth-int, use it.

var qopList = AuthArgs.qop.split(',');

for (var i in qopList) { qopList[i] = qopList[i].trim(); }

if (qopList.indexOf('auth-int') >= 0) { AuthArgs.qop = 'auth-int'; } else { AuthArgs.qop = 'auth'; }

}

*/

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);

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 + '"';

if (AuthArgs.opaque) { authstr += (',opaque="' + AuthArgs.opaque + '"'); }

obj.ws.headers.authorization = authstr;

obj.ws.authCNonceCount++;

} else {

// We don't have authentication, clear it out of the header if needed.

if (obj.ws.headers.authorization) { delete obj.ws.headers.authorization; }

}

// Reform the HTTP header

r = obj.ws.directive.join(' ') + '\r\n';

for (i in obj.ws.headers) { r += (i + ': ' + obj.ws.headers[i] + '\r\n'); }

r += '\r\n';

return r;

} else if (obj.ws.mode == 1) { // Length Body Mode

// Send the body of content-length size

var rl = obj.ws.count;

if (rl < obj.ws.acc.length) rl = obj.ws.acc.length;

r = obj.ws.acc.substring(0, rl);

obj.ws.acc = obj.ws.acc.substring(rl);

obj.ws.count -= rl;

if (obj.ws.count == 0) { obj.ws.mode = 0; }

return r;

} else if (obj.amt.mode == 2) { // Chunked Body Mode

// Send data one chunk at a time

headerend = obj.amt.acc.indexOf('\r\n');

if (headerend < 0) return '';

var chunksize = parseInt(obj.amt.acc.substring(0, headerend), 16);

if (isNaN(chunksize)) { // TODO: Check this path

// Chunk is not in this batch, move one

r = obj.amt.acc.substring(0, headerend + 2);

obj.amt.acc = obj.amt.acc.substring(headerend + 2);

// Peek if we next is the end of chunked transfer

headerend = obj.amt.acc.indexOf('\r\n');

if (headerend > 0) {

chunksize = parseInt(obj.amt.acc.substring(0, headerend), 16);

if (chunksize == 0) { obj.amt.mode = 0; }

}

return r;

} else if (chunksize == 0 && obj.amt.acc.length >= headerend + 4) {

// Send the ending chunk (NOTE: We do not support trailing headers)

r = obj.amt.acc.substring(0, headerend + 4);

obj.amt.acc = obj.amt.acc.substring(headerend + 4);

obj.amt.mode = 0;

return r;

} else if (chunksize > 0 && obj.amt.acc.length >= headerend + 4) {

// Send a chunk

r = obj.amt.acc.substring(0, headerend + chunksize + 4);

obj.amt.acc = obj.amt.acc.substring(headerend + chunksize + 4);

return r;

}

} else if (obj.ws.mode == 3) { // Until Close Mode

r = obj.ws.acc;

obj.ws.acc = '';

return r;

}

return '';

};

// Parse authentication values from the HTTP header

obj.GetAuthArgs = function (authheader) {

var authargs = {};

var authargsstr = authheader.substring(7).split(',');

for (var j in authargsstr) {

var argstr = authargsstr[j];

var i = argstr.indexOf('=');

var k = argstr.substring(0, i).trim().toLowerCase();

var v = argstr.substring(i + 1).trim();

if (v.substring(0, 1) == '\"') { v = v.substring(1, v.length - 1); }

if (i > 0) authargs[k] = v;

}

return authargs;

};

// 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;

var obj = {};

// Create a random hex string of a given length

obj.randomValueHex = function (len) { return crypto.randomBytes(Math.ceil(len / 2)).toString('hex').slice(0, len); };

obj.args = args;

obj.amt = { acc: '', mode: 0, count: 0, error: false, direct: false };

obj.ws = { acc: '', mode: 0, count: 0, error: false, direct: false, authCNonce: obj.randomValueHex(10), authCNonceCount: 1 };

obj.RedirectCommands = { StartRedirectionSession: 0x10, StartRedirectionSessionReply: 0x11, EndRedirectionSession: 0x12, AuthenticateSession: 0x13, AuthenticateSessionReply: 0x14 };

obj.StartRedirectionSessionReplyStatus = { SUCCESS: 0, TYPE_UNKNOWN: 1, BUSY: 2, UNSUPPORTED: 3, ERROR: 0xFF };

obj.AuthenticationStatus = { SUCCESS: 0, FALIURE: 1, NOTSUPPORTED: 2 };

obj.AuthenticationType = { QUERY: 0, USERPASS: 1, KERBEROS: 2, BADDIGEST: 3, DIGEST: 4 };

// Private method

obj.Debug = function (msg) { console.log(msg); };

// Process data coming from Intel AMT

obj.processAmtData = function (data) {

if ((obj.amt.direct == true) && (obj.amt.acc == '')) { return data; } // Interceptor fast path

obj.amt.acc += data.toString('binary'); // Add data to accumulator

data = '';

var datalen = 0;

do { datalen = data.length; data += obj.processAmtDataEx(); } while (datalen != data.length); // Process as much data as possible

return Buffer.from(data, 'binary');

};

// Process data coming from AMT in the accumulator

obj.processAmtDataEx = function () {

var r;

if (obj.amt.acc.length == 0) return '';

if (obj.amt.direct == true) {

var data = obj.amt.acc;

obj.amt.acc = '';

return data;

} else {

//console.log(obj.amt.acc.charCodeAt(0));

switch (obj.amt.acc.charCodeAt(0)) {

case obj.RedirectCommands.StartRedirectionSessionReply: {

if (obj.amt.acc.length < 4) return '';

if (obj.amt.acc.charCodeAt(1) == obj.StartRedirectionSessionReplyStatus.SUCCESS) {

if (obj.amt.acc.length < 13) return '';

var oemlen = obj.amt.acc.charCodeAt(12);

if (obj.amt.acc.length < 13 + oemlen) return '';

r = obj.amt.acc.substring(0, 13 + oemlen);

obj.amt.acc = obj.amt.acc.substring(13 + oemlen);

return r;

}

break;

}

case obj.RedirectCommands.AuthenticateSessionReply: {

if (obj.amt.acc.length < 9) return '';

var l = common.ReadIntX(obj.amt.acc, 5);

if (obj.amt.acc.length < 9 + l) return '';

var authstatus = obj.amt.acc.charCodeAt(1);

var authType = obj.amt.acc.charCodeAt(4);

if ((authType == obj.AuthenticationType.DIGEST) && (authstatus == obj.AuthenticationStatus.FALIURE)) {

// Grab and keep all authentication parameters

var realmlen = obj.amt.acc.charCodeAt(9);

obj.amt.digestRealm = obj.amt.acc.substring(10, 10 + realmlen);

var noncelen = obj.amt.acc.charCodeAt(10 + realmlen);

obj.amt.digestNonce = obj.amt.acc.substring(11 + realmlen, 11 + realmlen + noncelen);

var qoplen = obj.amt.acc.charCodeAt(11 + realmlen + noncelen);

obj.amt.digestQOP = obj.amt.acc.substring(12 + realmlen + noncelen, 12 + realmlen + noncelen + qoplen);

}

else if (authType != obj.AuthenticationType.QUERY && authstatus == obj.AuthenticationStatus.SUCCESS) {

// Intel AMT relayed that authentication was successful, go to direct relay mode in both directions.

obj.ws.direct = true;

obj.amt.direct = true;

}

r = obj.amt.acc.substring(0, 9 + l);

obj.amt.acc = obj.amt.acc.substring(9 + l);

return r;

}

default: {

obj.amt.error = true;

return '';

}

}

}

return '';

};

// Process data coming from the Browser

obj.processBrowserData = function (data) {

if ((obj.ws.direct == true) && (obj.ws.acc == '')) { return data; } // Interceptor fast path

obj.ws.acc += data.toString('binary'); // Add data to accumulator

data = '';

var datalen = 0;

do { datalen = data.length; data += obj.processBrowserDataEx(); } while (datalen != data.length); // Process as much data as possible

return Buffer.from(data, 'binary');

};

// Process data coming from the Browser in the accumulator

obj.processBrowserDataEx = function () {

var r;

if (obj.ws.acc.length == 0) return '';

if (obj.ws.direct == true) {

var data = obj.ws.acc;

obj.ws.acc = '';

return data;

} else {

switch (obj.ws.acc.charCodeAt(0)) {

case obj.RedirectCommands.StartRedirectionSession: {

if (obj.ws.acc.length < 8) return '';

r = obj.ws.acc.substring(0, 8);

obj.ws.acc = obj.ws.acc.substring(8);

return r;

}

case obj.RedirectCommands.EndRedirectionSession: {

if (obj.ws.acc.length < 4) return '';

r = obj.ws.acc.substring(0, 4);

obj.ws.acc = obj.ws.acc.substring(4);

return r;

}

case obj.RedirectCommands.AuthenticateSession: {

if (obj.ws.acc.length < 9) return '';

var l = common.ReadIntX(obj.ws.acc, 5);

if (obj.ws.acc.length < 9 + l) return '';

var authType = obj.ws.acc.charCodeAt(4);

if (authType == obj.AuthenticationType.DIGEST && obj.args.user && obj.args.pass) {

var authurl = '/RedirectionService';

if (obj.amt.digestRealm) {

// Replace this authentication digest with a server created one

// We have everything we need to authenticate

var nc = '0'+ (10000000 + obj.ws.authCNonceCount).toString().substring(1);// set NC at least 8 bytes

obj.ws.authCNonceCount++;

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);

// Replace this authentication digest with a server created one

// We have everything we need to authenticate

r = String.fromCharCode(0x13, 0x00, 0x00, 0x00, 0x04);

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);

r += String.fromCharCode(obj.args.user.length); // Username Length

r += obj.args.user; // Username

r += String.fromCharCode(obj.amt.digestRealm.length); // Realm Length

r += obj.amt.digestRealm; // Realm

r += String.fromCharCode(obj.amt.digestNonce.length); // Nonce Length

r += obj.amt.digestNonce; // Nonce

r += String.fromCharCode(authurl.length); // Authentication URL "/RedirectionService" Length

r += authurl; // Authentication URL

r += String.fromCharCode(obj.ws.authCNonce.length); // CNonce Length

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.

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;

}

}

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 '';

};

// 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;