82 lines
2.3 KiB
JavaScript
82 lines
2.3 KiB
JavaScript
// 13 b4 37 XX XX XX XX > (pk) - Authenticated
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// 13 37 > (pk) - I am <...>
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// e7 5a 3d ed > (gk) - Authenticate yourself
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// 55 44 e9 37 < (pk) - Forget me
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// e7 5a 3d ea > (pk) - Forget me. OK
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const dgram = require('dgram');
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const net = require('net');
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const { Tun } = require('tuntap2');
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const { encrypt, decrypt } = require('../encryption');
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const IP = require('ip-packet');
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const sock = dgram.createSocket('udp4');
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const tun = new Tun();
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var established = false;
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sock.on('message', (msg, info) => {
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const pd = decrypt(msg, config.privateKey, config.iv, config.algorithm);
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const gd = decrypt(msg, config.globalKey, config.iv, config.algorithm);
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const dec = pd.length == 0 ? gd : pd;
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if (dec.length == 4 && dec[0] == 0xe7 && dec[1] == 0x5a && dec[2] == 0x3d && dec[3] == 0xed) {
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console.log(`Server asks to authenticate. Authenticating...`);
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authenticateAndCheck();
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return;
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}
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if (dec.length == 7 && dec[0] == 0x13 && dec[1] == 0xb4 && dec[2] == 0x37) {
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const ip = dec.slice(3);
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const strIp = ip.map(s => s.toString()).join('.');
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console.log(`My IP: ${strIp}`);
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tun.mtu = config.mtu;
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tun.ipv4 = `${strIp}/${config.len}`;
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tun.isUp = true;
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tun.on('data', (d) => {
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sock.send(
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encrypt(
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d,
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config.privateKey,
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config.iv,
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config.algorithm
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),
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config.port,
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config.endpoint
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);
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});
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established = true;
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}
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if (established && (dec[0] >> 4 == 4)) {
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tun.write(dec);
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}
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});
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function authenticate() {
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sock.send(
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encrypt(
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Buffer.from([
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0x13, 0x37
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]),
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config.privateKey,
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config.iv,
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config.algorithm
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),
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config.port,
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config.endpoint
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);
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}
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function authenticateAndCheck() {
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authenticate();
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var i = setInterval(() => {
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if (!established) {
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console.log(`Connection not established. Authenticating again...`);
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authenticate();
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} else {
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clearInterval(i);
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console.log(`Authenticated.`);
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}
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}, 5000);
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}
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authenticateAndCheck(); |