368 lines
16 KiB
PHP
Executable File
368 lines
16 KiB
PHP
Executable File
<?php
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set_include_path(get_include_path().PATH_SEPARATOR.dirname(__FILE__).DIRECTORY_SEPARATOR.'libpy2php');
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require_once 'libpy2php.php';
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require_once 'os_path.php';
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require_once 'crypt.php';
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require_once 'prime.php';
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require_once 'TL.php';
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require_once 'vendor/autoload.php';
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$struct = new \danog\PHP\StructClass();
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/**
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* Function to get hex crc32
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* :param data: Data to encode.
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*/
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function newcrc32($data)
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{
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return hexdec(hash('crc32b', $data));
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}
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/**
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* Function to dump the hex version of a string.
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*
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* @param $what What to dump.
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*/
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function hex_dump(...$what)
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{
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foreach ($what as $w) {
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var_dump(bin2hex($w));
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}
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}
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/**
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* len.
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*
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* Get the length of a string or of an array
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*
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* @param $input String or array to parse
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*
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* @return int with the length
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**/
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function len($input)
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{
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if (is_array($input)) {
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return count($input);
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}
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return strlen($input);
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}
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/**
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* Function to visualize byte streams. Split into bytes, print to console.
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* :param bs: BYTE STRING.
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*/
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function vis($bs)
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{
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$bs = str_split($bs);
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$symbols_in_one_line = 8;
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$n = floor(len($bs) / $symbols_in_one_line);
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$i = 0;
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foreach (pyjslib_range($n) as $i) {
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echo $i * $symbols_in_one_line.' | '.implode(' ',
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array_map(function ($el) {
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return bin2hex($el);
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}, array_slice($bs, $i * $symbols_in_one_line, ($i + 1) * $symbols_in_one_line))
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).PHP_EOL;
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}
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if (len($bs) % $symbols_in_one_line != 0) {
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echo($i + 1) * $symbols_in_one_line.' | '.implode(' ',
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array_map(function ($el) {
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return bin2hex($el);
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}, array_slice($bs, ($i + 1) * $symbols_in_one_line))
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).PHP_EOL;
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}
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}
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/**
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* posmod(numeric,numeric) : numeric
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* Works just like the % (modulus) operator, only returns always a postive number.
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*/
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function posmod($a, $b)
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{
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$resto = $a % $b;
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if ($resto < 0) {
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$resto += abs($b);
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}
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return $resto;
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}
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function fread_all($handle)
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{
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$pos = ftell($handle);
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fseek($handle, 0);
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$content = fread($handle, fstat($handle)['size']);
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fseek($handle, $pos);
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return $content;
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}
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function fopen_and_write($filename, $mode, $data)
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{
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$handle = fopen($filename, $mode);
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fwrite($handle, $data);
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rewind($handle);
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return $handle;
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}
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function string2bin($string)
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{
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$res = null;
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foreach (explode('\\', $string) as $s) {
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if ($s != null && strlen($s) == 3) {
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$res .= hex2bin(substr($s, 1));
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}
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}
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return $res;
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}
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/**
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* Manages TCP Transport. encryption and message frames.
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*/
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class Session
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{
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public function __construct($ip, $port, $auth_key = null, $server_salt = null)
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{
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$this->sock = fsockopen('tcp://'.$ip.':'.$port);
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if (!(get_resource_type($this->sock) == 'file' || get_resource_type($this->sock) == 'stream')) {
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throw new Exception("Couldn't connect to socket.");
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}
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$this->number = 0;
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$this->timedelta = 0;
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$this->session_id = \phpseclib\Crypt\Random::string(8);
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$this->auth_key = $auth_key;
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$this->auth_key_id = $this->auth_key ? substr(sha1($this->auth_key, true), -8) : null;
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stream_set_timeout($this->sock, 5);
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$this->MAX_RETRY = 5;
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$this->AUTH_MAX_RETRY = 5;
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$this->struct = new \danog\PHP\Struct();
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$this->PrimeModule = new PrimeModule();
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try {
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$this->tl = new TL('https://core.telegram.org/schema/mtproto-json');
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} catch (Exception $e) {
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$this->tl = new TL(__DIR__.'/TL_schema.JSON');
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}
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}
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public function __destruct()
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{
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fclose($this->sock);
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}
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/**
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* Forming the message frame and sending message to server
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* :param message: byte string to send.
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*/
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public function send_message($message_data)
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{
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$message_id = $this->struct->pack('<Q', (int) ((time() + $this->timedelta) * pow(2, 30)) * 4);
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if (($this->auth_key == null) || ($this->server_salt == null)) {
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$message = string2bin('\x00\x00\x00\x00\x00\x00\x00\x00').$message_id.$this->struct->pack('<I', strlen($message_data)).$message_data;
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} else {
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$encrypted_data =
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$this->server_salt.$this->session_id.$message_id.$this->struct->pack('<II', $this->number, strlen($message_data)).$message_data;
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$message_key = substr(sha1($encrypted_data, true), -16);
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$padding = \phpseclib\Crypt\Random::string(posmod(-strlen($encrypted_data), 16));
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echo strlen($encrypted_data.$padding).PHP_EOL;
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list($aes_key, $aes_iv) = $this->aes_calculate($message_key);
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$message = $this->auth_key_id.$message_key.crypt::ige_encrypt($encrypted_data.$padding, $aes_key, $aes_iv);
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}
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$step1 = $this->struct->pack('<II', (strlen($message) + 12), $this->number).$message;
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$step2 = $step1.$this->struct->pack('<I', newcrc32($step1));
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fwrite($this->sock, $step2);
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$this->number += 1;
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}
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/**
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* Reading socket and receiving message from server. Check the CRC32.
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*/
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public function recv_message()
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{
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$packet_length_data = fread($this->sock, 4);
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if (len($packet_length_data) < 4) {
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throw new Exception('Nothing in the socket!');
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}
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$packet_length = $this->struct->unpack('<I', $packet_length_data)[0];
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var_dump($packet_length);
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$packet = fread($this->sock, ($packet_length - 4));
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if (!(newcrc32($packet_length_data.substr($packet, 0, -4)) == $this->struct->unpack('<I', substr($packet, -4))[0])) {
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throw new Exception('CRC32 was not correct!');
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}
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$x = $this->struct->unpack('<I', substr($packet, 0, 4));
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$auth_key_id = substr($packet, 4, 8);
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if ($auth_key_id == string2bin('\x00\x00\x00\x00\x00\x00\x00\x00')) {
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list($message_id, $message_length) = $this->struct->unpack('<8sI', substr($packet, 12, 12));
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$data = substr($packet, 24, (24 + $message_length) - 24);
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} elseif ($auth_key_id == $this->auth_key_id) {
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$message_key = substr($packet, 12, 28 - 12);
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$encrypted_data = substr($packet, 28, -4 - 28);
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list($aes_key, $aes_iv) = $this->aes_calculate($message_key, 'from server');
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$decrypted_data = crypt::ige_decrypt($encrypted_data, $aes_key, $aes_iv);
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if (substr($decrypted_data, 0, 8) != $this->server_salt) {
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throw new Exception('Server salt does not match.');
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}
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if (substr($decrypted_data, 8, 8) != $this->session_id) {
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throw new Exception('Session id does not match.');
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}
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$message_id = substr($decrypted_data, 16, 24 - 16);
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$seq_no = $this->struct->unpack('<I', substr($decrypted_data, 24, 28 - 24)) [0];
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$message_data_length = $this->struct->unpack('<I', substr($decrypted_data, 28, 32 - 28)) [0];
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$data = substr($decrypted_data, 32, (32 + $message_data_length) - 32);
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} else {
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throw new Exception('Got unknown auth_key id');
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}
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return $data;
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}
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public function method_call($method, $kwargs)
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{
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//var_dump($kwargs);
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foreach (range(1, $this->MAX_RETRY) as $i) {
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try {
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$this->send_message($this->tl->serialize_method($method, $kwargs));
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$server_answer = $this->recv_message();
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} catch (Exception $e) {
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echo 'An error occurred while calling method '.$method.': '.$e->getMessage().PHP_EOL.'Stack trace:'.$e->getTraceAsString().PHP_EOL.'Retrying to call method...'.PHP_EOL.PHP_EOL;
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continue;
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}
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if ($server_answer == null) {
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throw new Exception('An error occurred while calling method '.$method.'.');
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}
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return $this->tl->deserialize(fopen_and_write('php://memory', 'rw+b', $server_answer));
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}
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throw new Exception('An error occurred while calling method '.$method.'.');
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}
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public function create_auth_key()
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{
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$f = file_get_contents(__DIR__.'/rsa.pub');
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$key = new \phpseclib\Crypt\RSA();
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$key->load($f);
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$nonce = \phpseclib\Crypt\Random::string(16);
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pyjslib_printnl('Requesting pq');
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$ResPQ = $this->method_call('req_pq', ['nonce' => $nonce]);
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if ($ResPQ['nonce'] !== $nonce) {
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throw new Exception('Handshake: wrong nonce');
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}
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$server_nonce = $ResPQ['server_nonce'];
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$public_key_fingerprint = (int) $ResPQ['server_public_key_fingerprints'][0];
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$pq_bytes = $ResPQ['pq'];
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$pq = new \phpseclib\Math\BigInteger($pq_bytes, 256);
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list($p, $q) = $this->PrimeModule->primefactors($pq);
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$p = new \phpseclib\Math\BigInteger($p);
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$q = new \phpseclib\Math\BigInteger($q);
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if ($p->compare($q) > 0) {
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list($p, $q) = [$q, $p];
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}
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if (!(($pq->equals($p->multiply($q))) && ($p < $q))) {
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throw new Exception("Handshake: couldn't compute p or q.");
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}
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pyjslib_printnl(sprintf('Factorization %s = %s * %s', $pq, $p, $q));
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$p_bytes = $this->struct->pack('>Q', (string) $p);
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$q_bytes = $this->struct->pack('>Q', (string) $q);
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$new_nonce = \phpseclib\Crypt\Random::string(32);
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$data = $this->tl->serialize_obj('p_q_inner_data', ['pq' => $pq_bytes, 'p' => $p_bytes, 'q' => $q_bytes, 'nonce' => $nonce, 'server_nonce' => $server_nonce, 'new_nonce' => $new_nonce]);
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$sha_digest = sha1($data, true);
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$random_bytes = \phpseclib\Crypt\Random::string(255 - strlen($data) - strlen($sha_digest));
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$to_encrypt = $sha_digest.$data.$random_bytes;
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$encrypted_data = $key->_raw_encrypt($to_encrypt);
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pyjslib_printnl('Starting Diffie Hellman key exchange');
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$server_dh_params = $this->method_call('req_DH_params', ['nonce' => $nonce, 'server_nonce' => $server_nonce, 'p' => $p_bytes, 'q' => $q_bytes, 'public_key_fingerprint' => $public_key_fingerprint, 'encrypted_data' => $encrypted_data]);
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if ($nonce != $server_dh_params['nonce']) {
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throw new Exception('Handshake: wrong nonce.');
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}
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if ($server_nonce != $server_dh_params['server_nonce']) {
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throw new Exception('Handshake: wrong server nonce.');
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}
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$encrypted_answer = $server_dh_params['encrypted_answer'];
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$tmp_aes_key = sha1($new_nonce.$server_nonce, true).substr(sha1($server_nonce.$new_nonce, true), 0, 12);
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$tmp_aes_iv = substr(sha1($server_nonce.$new_nonce, true), 12, 8).sha1($new_nonce.$new_nonce, true).substr($new_nonce, 0, 4);
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$answer_with_hash = crypt::ige_decrypt($encrypted_answer, $tmp_aes_key, $tmp_aes_iv);
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$answer_hash = substr($answer_with_hash, 0, 20);
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$answer = substr($answer_with_hash, 20);
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$server_DH_inner_data = deserialize(fopen_and_write('php://memory', 'rw+b', $answer));
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if ($nonce != $server_DH_inner_data['nonce']) {
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throw new Exception('Handshake: wrong nonce');
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}
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if ($server_nonce != $server_DH_inner_data['server_nonce']) {
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throw new Exception('Handshake: wrong server nonce');
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}
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$dh_prime_str = $server_DH_inner_data['dh_prime'];
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$g = $server_DH_inner_data['g'];
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$g_a_str = $server_DH_inner_data['g_a'];
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$server_time = $server_DH_inner_data['server_time'];
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$this->timedelta = ($server_time - time());
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pyjslib_printnl(sprintf('Server-client time delta = %.1f s', $this->timedelta));
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$dh_prime = $this->struct->unpack('>Q', $dh_prime_str);
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$g_a = $this->struct->unpack('>Q', $g_a_str);
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if (!$this->PrimeModule->isprime($dh_prime)) {
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throw new Exception("Handshake: dh_prime isn't a prime.");
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}
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$retry_id = 0;
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$b_str = \phpseclib\Crypt\Random::string(256);
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$b = $this->struct->unpack('>Q', $b_str);
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$g_b = pow($g, $b, $dh_prime);
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$g_b_str = $this->struct->pack('>Q', $g_b);
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$data = serialize_obj(['client_DH_inner_data'], ['nonce' => $nonce, 'server_nonce' => $server_nonce, 'retry_id' => $retry_id, 'g_b' => $g_b_str]);
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$data_with_sha = sha1($data, true).$data;
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$data_with_sha_padded = $data_with_sha.\phpseclib\Crypt\Random::string(posmod(-strlen($data_with_sha), 16));
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$encrypted_data = crypt::ige_encrypt($data_with_sha_padded, $tmp_aes_key, $tmp_aes_iv);
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foreach (pyjslib_range(1, $this->AUTH_MAX_RETRY) as $i) {
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$Set_client_DH_params_answer = $this->method_call('set_client_DH_params', ['nonce' => $nonce, 'server_nonce' => $server_nonce, 'encrypted_data' => $encrypted_data]);
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$auth_key = pow($g_a, $b, $dh_prime);
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$auth_key_str = $this->struct->pack('>Q', $auth_key);
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$auth_key_sha = sha1($auth_key_str, true);
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$auth_key_aux_hash = substr($auth_key_sha, 0, 8);
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$new_nonce_hash1 = substr(sha1($new_nonce.''.$auth_key_aux_hash, true), -16);
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$new_nonce_hash2 = substr(sha1($new_nonce.''.$auth_key_aux_hash, true), -16);
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$new_nonce_hash3 = substr(sha1($new_nonce.''.$auth_key_aux_hash, true), -16);
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if ($Set_client_DH_params_answer['nonce'] != $nonce) {
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throw new Exception('Handshake: wrong nonce.');
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}
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if ($Set_client_DH_params_answer['server_nonce'] != $server_nonce) {
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throw new Exception('Handshake: wrong server nonce');
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}
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if ($Set_client_DH_params_answer->name == 'dh_gen_ok') {
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if ($Set_client_DH_params_answer['new_nonce_hash1'] != $new_nonce_hash1) {
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throw new Exception('Handshake: wrong new_nonce_hash1');
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}
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pyjslib_printnl('Diffie Hellman key exchange processed successfully');
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$this->server_salt = new strxor(substr($new_nonce, 0, 8 - 0), substr($server_nonce, 0, 8 - 0));
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$this->auth_key = $auth_key_str;
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$this->auth_key_id = substr($auth_key_sha, -8);
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pyjslib_printnl('Auth key generated');
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return 'Auth Ok';
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} elseif ($Set_client_DH_params_answer->name == 'dh_gen_retry') {
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if ($Set_client_DH_params_answer['new_nonce_hash2'] != $new_nonce_hash2) {
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throw new Exception('Handshake: wrong new_nonce_hash_2');
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}
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pyjslib_printnl('Retry Auth');
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} elseif ($Set_client_DH_params_answer->name == 'dh_gen_fail') {
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if ($Set_client_DH_params_answer['new_nonce_hash3'] != $new_nonce_hash3) {
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throw new Exception('Handshake: wrong new_nonce_hash_3');
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}
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pyjslib_printnl('Auth Failed');
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throw new Exception('Auth Failed');
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} else {
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throw new Exception('Response Error');
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}
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}
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}
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public function aes_calculate($msg_key, $direction = 'to server')
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{
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$x = ($direction == 'to server') ? 0 : 8;
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$sha1_a = sha1($msg_key.substr($this->auth_key, $x, ($x + 32) - $x), true);
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$sha1_b = sha1(substr($this->auth_key, ($x + 32), ($x + 48) - ($x + 32)).$msg_key.substr($this->auth_key, (48 + $x), (64 + $x) - (48 + $x)), true);
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$sha1_c = sha1(substr($this->auth_key, ($x + 64), ($x + 96) - ($x + 64)).$msg_key, true);
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$sha1_d = sha1($msg_key.substr($this->auth_key, ($x + 96), ($x + 128) - ($x + 96)), true);
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$aes_key = substr($sha1_a, 0, 8 - 0).substr($sha1_b, 8, 20 - 8).substr($sha1_c, 4, 16 - 4);
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$aes_iv = substr($sha1_a, 8, 20 - 8).substr($sha1_b, 0, 8 - 0).substr($sha1_c, 16, 20 - 16).substr($sha1_d, 0, 8 - 0);
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return [$aes_key, $aes_iv];
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}
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}
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