v0.7.2
- Rename project - Add GPL3 License (RETROACTIVE) - Fill out package.json - Switch crc16 module to hopefully improve Windows end-user experience - Update README
This commit is contained in:
zefie
310
zefie_wtvp_minisrv/wtvsec.js
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310
zefie_wtvp_minisrv/wtvsec.js
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const CryptoJS = require('crypto-js');
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const endianness = require('endianness');
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var crypto = require('crypto');
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class WTVSec {
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//initial_shared_key = CryptoJS.lib.WordArray.random(8);
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initial_shared_key_b64 = "CC5rWmRUE0o="; // You can change this but it doesn't mean much for security. Just make sure its static. 8 bytes base64 encoded.
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initial_shared_key = null;
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current_shared_key = null;
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challenge_key = null;
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challenge_signed_key = null;
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challenge_raw = null;
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challenge_response = null;
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ticket_b64 = null;
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incarnation = 0;
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session_key1 = null;
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session_key2 = null;
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hRC4_Key1 = null;
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hRC4_Key2 = null;
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RC4Session = new Array();
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zdebug = false;
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constructor(wtv_incarnation = 1) {
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this.zdebug = true;
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this.initial_shared_key = CryptoJS.enc.Base64.parse(this.initial_shared_key_b64);
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if (this.initial_shared_key.sigBytes === 8) {
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this.incarnation = wtv_incarnation;
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this.current_shared_key = this.initial_shared_key;
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} else {
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throw ("Invalid initial key length");
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}
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}
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set_incarnation(wtv_incarnation) {
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if (this.incarnation != wtv_incarnation) {
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this.incarnation = wtv_incarnation;
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this.SecureOn();
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}
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}
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increment_incarnation() {
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this.set_incarnation(parseInt(this.incarnation) + 1);
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}
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DuplicateWordArray(wa) {
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return CryptoJS.lib.WordArray.create(this.wordArrayToUint8Array(wa).buffer);
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}
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PrepareTicket() {
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// store last challenge response in ticket
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var ticket_data = this.challenge_raw;
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try {
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var ticket_data_enc = CryptoJS.DES.encrypt(ticket_data, this.current_shared_key, {
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.NoPadding
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});
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// create a copy of WordArray since concat modifies the original
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var current_shared_key = this.DuplicateWordArray(this.current_shared_key);
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var challenge_signed_key = this.DuplicateWordArray(this.challenge_signed_key);
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this.ticket_b64 = current_shared_key.concat(challenge_signed_key.concat(ticket_data_enc.ciphertext)).toString(CryptoJS.enc.Base64);
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} catch (e) {
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console.log("Error encrypting ticket: " + e.toString());
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return null;
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}
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return this.ticket_b64;
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}
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DecodeTicket(ticket_b64) {
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var ticket_hex = CryptoJS.enc.Base64.parse(ticket_b64).toString(CryptoJS.enc.Hex);
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var ticket_key = CryptoJS.enc.Hex.parse(ticket_hex.substring(0,16));
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var challenge_key = CryptoJS.enc.Hex.parse(ticket_hex.substring(16, 32));
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var challenge_enc = CryptoJS.enc.Hex.parse(ticket_hex.substring(32));
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var ticket_dec = CryptoJS.DES.decrypt(
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{
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ciphertext: challenge_enc
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},
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ticket_key,
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{
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.NoPadding
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}
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);
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this.ProcessChallenge(ticket_dec.toString(CryptoJS.enc.Base64), challenge_key);
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console.log(" * Decoded session from wtv-ticket");
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}
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ProcessChallenge(wtv_challenge, key = this.current_shared_key) {
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var challenge_raw = CryptoJS.enc.Base64.parse(wtv_challenge);
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if (challenge_raw.sigBytes > 8) {
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var challenge_raw_hex = challenge_raw.toString(CryptoJS.enc.Hex);
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var challenge_id_hex = challenge_raw_hex.substring(0, (8 * 2));
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var challenge_enc_hex = challenge_raw_hex.substring((8*2));
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var challenge_enc = CryptoJS.enc.Hex.parse(challenge_enc_hex);
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var challenge_decrypted = CryptoJS.DES.decrypt(
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{
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ciphertext: challenge_enc
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},
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key,
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{
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.NoPadding
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}
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);
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var challenge_dec_hex = challenge_decrypted.toString(CryptoJS.enc.Hex);
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var challenge_md5_challenge = CryptoJS.MD5(CryptoJS.enc.Hex.parse(challenge_dec_hex.substring(0, (80 * 2))));
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var test = challenge_dec_hex.substring((80 * 2), (96 * 2));
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var test2 = challenge_md5_challenge.toString(CryptoJS.enc.Hex);
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if (test == test2) {
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this.current_shared_key = CryptoJS.enc.Hex.parse(challenge_dec_hex.substring((72*2), (80*2)));
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var challenge_echo = CryptoJS.enc.Hex.parse(challenge_dec_hex.substr(0, (40*2)));
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// RC4 encryption keys.Stored in the wtv-ticket on the server side.
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this.session_key1 = CryptoJS.enc.Hex.parse(challenge_dec_hex.substring((40*2), (56*2)));
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this.session_key2 = CryptoJS.enc.Hex.parse(challenge_dec_hex.substring((56*2), (72*2)));
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var echo_encrypted = CryptoJS.DES.encrypt(CryptoJS.MD5(challenge_echo).concat(challenge_echo).concat(CryptoJS.enc.Utf8.parse("\x08".repeat(8))), this.current_shared_key, {
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.NoPadding
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});
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// Last bytes is just extra padding
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this.challenge_raw = challenge_raw;
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this.challenge_key = this.current_shared_key;
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var challenge_response = CryptoJS.enc.Hex.parse(challenge_raw_hex.substr(0, (8 * 2))).concat(echo_encrypted.ciphertext);
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return challenge_response;
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} else {
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throw ("Couldn't solve challenge");
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return "";
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}
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} else {
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throw ("Invalid challenge length");
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}
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}
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IssueChallenge() {
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/*
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* bytes 0-8: Random id? Just echoed in the response
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* bytes 8 - XX: DES encrypted block.Encrypted with the initial key or subsequent keys from the challenge.
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* bytes 8 - 48: hidden random data we echo back in the response
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* bytes 48 - 64: session key 1 used in RC4 encryption triggered by SECURE ON
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* bytes 64 - 80: session key 2 used in RC4 encryption triggered by SECURE ON
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* bytes 80 - 88: new key for future challenges
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* bytes 88 - 104: MD5 of 8 - 88
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* bytes 104 - 112: padding.not important
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*/
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var challenge_id = CryptoJS.lib.WordArray.random(8);
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var echo_me = CryptoJS.lib.WordArray.random(40);
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this.session_key1 = CryptoJS.lib.WordArray.random(16);
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this.session_key2 = CryptoJS.lib.WordArray.random(16);
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var new_shared_key = CryptoJS.lib.WordArray.random(8);
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var session_key1 = this.DuplicateWordArray(this.session_key1);
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var session_key2 = this.DuplicateWordArray(this.session_key2);
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var challenge_puzzle = echo_me.concat(session_key1.concat(session_key2.concat(new_shared_key)));
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var challenge_secret = challenge_puzzle.concat(CryptoJS.MD5(challenge_puzzle).concat(CryptoJS.enc.Hex.parse("\x08".repeat(8))));
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// Shhhh!!
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var challenge_secreted = CryptoJS.DES.encrypt(challenge_secret, this.current_shared_key, {
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.NoPadding
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});
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var challenge = challenge_id.concat(challenge_secreted.ciphertext);
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var challenge_b64 = challenge.toString(CryptoJS.enc.Base64);
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// get the expected response for when client sends it
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this.challenge_signed_key = this.current_shared_key;
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this.challenge_response = this.ProcessChallenge(challenge_b64);
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return challenge_b64;
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}
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wordToByteArray(word, length) {
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var ba = [],
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i,
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xFF = 0xFF;
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if (length > 0)
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ba.push(word >>> 24);
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if (length > 1)
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ba.push((word >>> 16) & xFF);
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if (length > 2)
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ba.push((word >>> 8) & xFF);
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if (length > 3)
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ba.push(word & xFF);
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return ba;
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}
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wordArrayToUint8Array(wordArray, length = 0) {
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if (wordArray.hasOwnProperty("sigBytes") && wordArray.hasOwnProperty("words")) {
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length = wordArray.sigBytes;
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wordArray = wordArray.words;
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}
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var result = [],
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bytes,
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i = 0;
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while (length > 0) {
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bytes = this.wordToByteArray(wordArray[i], Math.min(4, length));
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length -= bytes.length;
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result.push(bytes);
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i++;
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}
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return new Uint8Array([].concat.apply([], result));
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}
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SecureOn(rc4session = null) {
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if (this.zdebug) console.log(" # Generating RC4 sessions with wtv-incarnation: " + this.incarnation);
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var buf = new Uint8Array([0xff & this.incarnation, 0xff & (this.incarnation >> 8), 0xff & (this.incarnation >> 16), 0xff & (this.incarnation >> 24)]);
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endianness(buf, 4);
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this.hRC4_Key1 = CryptoJS.MD5(this.DuplicateWordArray(this.session_key1).concat(CryptoJS.lib.WordArray.create(buf).concat(this.DuplicateWordArray(this.session_key1))));
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this.hRC4_Key2 = CryptoJS.MD5(this.DuplicateWordArray(this.session_key2).concat(CryptoJS.lib.WordArray.create(buf).concat(this.DuplicateWordArray(this.session_key2))));
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switch (rc4session) {
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case 0:
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this.RC4Session[0] = crypto.createCipheriv('rc4', Buffer.from(this.wordArrayToUint8Array(this.hRC4_Key1)),'');
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break;
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case 1:
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this.RC4Session[1] = crypto.createDecipheriv('rc4', Buffer.from(this.wordArrayToUint8Array(this.hRC4_Key1)),'');
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break;
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case 2:
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this.RC4Session[2] = crypto.createCipheriv('rc4', Buffer.from(this.wordArrayToUint8Array(this.hRC4_Key2)),'');
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break;
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case 3:
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this.RC4Session[3] = crypto.createDecipheriv('rc4', Buffer.from(this.wordArrayToUint8Array(this.hRC4_Key2)),'');
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break;
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default:
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this.RC4Session[0] = crypto.createCipheriv('rc4', Buffer.from(this.wordArrayToUint8Array(this.hRC4_Key1)), '');
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this.RC4Session[1] = crypto.createDecipheriv('rc4', Buffer.from(this.wordArrayToUint8Array(this.hRC4_Key1)), '');
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this.RC4Session[2] = crypto.createCipheriv('rc4', Buffer.from(this.wordArrayToUint8Array(this.hRC4_Key2)), '');
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this.RC4Session[3] = crypto.createDecipheriv('rc4', Buffer.from(this.wordArrayToUint8Array(this.hRC4_Key2)), '');
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break;
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}
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}
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NewRC4Session(num) {
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this.SecureOn(num);
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}
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Encrypt(keynum, data) {
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var session_id;
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switch (keynum) {
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case 0:
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session_id = 0;
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break;
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case 1:
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session_id = 2
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break;
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default:
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throw ("Invalid key option (0 or 1 only)");
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break;
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}
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if (!this.RC4Session[session_id]) {
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this.NewRC4Session(session_id);
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}
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if (data.words) {
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data = new Buffer.from(this.wordArrayToUint8Array(data));
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} else if (data.constructor === ArrayBuffer) {
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data = new Buffer.from(data);
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}
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return this.RC4Session[session_id].update(data);
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}
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Decrypt(keynum, data) {
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var session_id;
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switch (keynum) {
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case 0:
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session_id = 1;
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break;
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case 1:
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session_id = 3;
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break;
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default:
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throw ("Invalid key option (0 or 1 only)");
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break;
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}
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if (!this.RC4Session[session_id]) {
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this.NewRC4Session(session_id);
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}
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if (data.words) {
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data = new Buffer.from(this.wordArrayToUint8Array(data));
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} else if (data.constructor === ArrayBuffer) {
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data = new Buffer.from(data);
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}
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return this.RC4Session[session_id].update(data);
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}
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Test() {
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console.log("TEST RUN");
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console.log("Test python challenge");
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this.current_shared_key = CryptoJS.enc.Base64.parse("CC5rWmRUE0o=");
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var current_challenge = "0kjyqIYAu0ziFBbSERN6DGaZ6S0fT+DBUCtpHCJ4lpuM7CbXdAm+x83BIDoJYztd1Z+5KFZ7ghmb3LJCT/6mhWUYkqqKOyfPRW8ZIdbICK/CV+Kxm8EUjRXZSk/97tsmFpH3hcCJ7C2TBw+TX38uQQ==";
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var expected_result = "0kjyqIYAu0zI5QrLhSuEUFgKkoVSxI3zBlUMfhnIYoMy0ExfIX4s/mHvILseDFx+17trk7YO+xG9D2qSY6v9XVUS1OP1m8ee";
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console.log("Expected: " + expected_result);
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console.log("Got: " + this.ProcessChallenge(current_challenge));
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}
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}
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module.exports = WTVSec;
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