340 lines
16 KiB
PHP
Executable File
340 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 ('Struct.php');
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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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return hexdec(hash("crc32b", $data));
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}
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/**
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* Function to dump the hex version of a string.
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* :param what: What to dump
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*/
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function hex_dump($what) { var_dump(bin2hex($what)); };
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/**
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* Function slice a certain string. Works just like array_slice, only with a string.
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* :param data: data to slice
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* :param offset: If offset is non-negative, the sequence will start at that offset in the string. If offset is negative, the sequence will start that far from the end of the string.
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* :param length: If length is given and is positive, then the sequence will have up to that many chars in it. If the string is shorter than the length, then only the available string chars will be present. If length is given and is negative then the sequence will stop that many chars from the end of the string. If it is omitted, then the sequence will have everything from offset up until the end of the string.
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*/
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function file_slice($data, $offset, $length) {
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$size = strlen($data);
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if($offset < 0) $offset = $size + $offset;
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if($length < 0) $length = $size + $length;
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if($length == null) $length = $size;
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if($offset == null) $offset = 0;
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$packet_sliced = "";
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while ($length != 0) { if($offset == $size) break; $packet_sliced .= $data[$offset]; $offset++; $length--; }
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return $packet_sliced;
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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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$bs = str_split($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 * $symbols_in_one_line . ' | ' . join(' ',
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array_map(function($el) { return bin2hex($el); }, array_slice($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) * $symbols_in_one_line . ' | ' . join(' ',
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array_map(function($el) { return bin2hex($el); }, array_slice($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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* bytes_to_long(string) : long
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* Convert a byte string to a long integer.
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* This is (essentially) the inverse of long_to_bytes().
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*/
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function bytes_to_long($s) {
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$acc = 0;
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$length = strlen($s);
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if (($length % 4)) {
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$extra = (4 - ($length % 4));
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$s = (($b('') * $extra) + $s);
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$length = ($length + $extra);
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}
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foreach( pyjslib_range(0, $length, 4) as $i ) {
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$acc = ($acc << 32 + $this->struct->unpack('I', array_slice($s, $i, ($i + 4) - $i))[0]);
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}
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return $acc;
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}
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function fread_all($handle) {
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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, $data) {
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$handle = fopen($filename, $mode);
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fwrite($handle, $data);
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rewind($handle);
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return $handle;
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}
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/**
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* long_to_bytes(n:long, blocksize:int) : string
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* Convert a long integer to a byte string.
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* If optional blocksize is given and greater than zero, pad the front of the
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* byte string with binary zeros so that the length is a multiple of
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* blocksize.
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*/
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function long_to_bytes($n,$blocksize=0) {
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$s = $b('');
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$n = long($n);
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while (($n > 0)) {
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$s = ($this->struct->pack('I', $n & 4294967295) + $s);
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$n = $n >> 32;
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}
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foreach( pyjslib_range(strlen($s)) as $i ) {
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if (($s[$i] != $b('')[0])) {
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break;
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}
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}
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$s = array_slice($s, $i, null);
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if (($blocksize > 0) && (strlen($s) % $blocksize)) {
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$s = ((($blocksize - (strlen($s) % $blocksize)) * $b('')) + $s);
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}
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return $s;
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}
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function string2bin($string) {
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$res = null;
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foreach(explode('\\', $string) as $s) {
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if($s != null && $s[0] == "x") {
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$res .= hex2bin(substr($s, 1));
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}
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}
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return $res;
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}
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/**
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* Manages TCP Transport. encryption and message frames
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*/
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class Session {
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function __construct($ip, $port, $auth_key = null, $server_salt = null) {
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$this->sock = fsockopen("tcp://".$ip.":".$port);
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$this->number = 0;
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$this->timedelta = 0;
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$this->session_id = random_bytes(8);
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$this->auth_key = $auth_key;
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$this->auth_key_id = $this->auth_key ? substr(sha1($this->auth_key, true), -8, null) : 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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}
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function __destruct() {
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fclose($this->sock);
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}
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/**
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* Forming the message frame and sending message to server
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* :param message: byte string to send
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*/
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function send_message($message_data) {
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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($encrypted_data, true), -16, null);
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$padding = random_bytes((-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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function recv_message() {
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$packet_length_data = fread($this->sock, 4);
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if (strlen($packet_length_data) < 4) {
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throw new Exception('Nothing in the socket!');
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}
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$packet_length = $this->struct->pack('<I', $packet_length_data)[1];
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$packet = fread($this->sock, ($packet_length - 4));
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if (!(newcrc32($packet_length_data . file_slice($packet, 0, -4 - 0)) == unpack_le('I', file_slice($packet, -4, null))[1])) {
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throw new Exception('CRC32 was not correct!');
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}
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$x = [unpack('I', file_slice($packet, null, 4))[1]];
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$auth_key_id = file_slice($packet, 4, 12 - 4);
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if (($auth_key_id == ' ')) {
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$unpacked = unpack('c8/Iint', file_slice($packet, 12, 24 - 12));
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$message_length = $unpacked["int"];
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unset($unpacked["int"]);
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$message_id = "";
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foreach ($unpacked as $chr) {
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$message_id .= chr($chr);
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}
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$data = file_slice($packet, 24, (24 + $message_length) - 24);
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} else if (($auth_key_id == $this->auth_key_id)) {
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$message_key = array_slice($packet, 12, 28 - 12);
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$encrypted_data = array_slice($packet, 28, -4 - 28);
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list($aes_key, $aes_iv) = py2php_kwargs_method_call($this, 'aes_calculate', [$message_key], ["direction" => 'from server']);
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$decrypted_data = crypt::ige_decrypt($encrypted_data, $aes_key, $aes_iv);
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assert((array_slice($decrypted_data, 0, 8 - 0) == $this->server_salt));
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assert((array_slice($decrypted_data, 8, 16 - 8) == $this->session_id));
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$message_id = array_slice($decrypted_data, 16, 24 - 16);
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$seq_no = unpack('I', array_slice($decrypted_data, 24, 28 - 24)) [0];
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$message_data_length = unpack('I', array_slice($decrypted_data, 28, 32 - 28)) [0];
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$data = array_slice($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 $data;
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}
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function method_call($method, $kwargs) {
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foreach (pyjslib_range(1, $this->MAX_RETRY) as $i) {
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try {
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//var_dump(py2php_kwargs_function_call('serialize_method', [$method], $kwargs));
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$this->send_message(serialize_method($method, $kwargs));
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$server_answer = $this->recv_message();
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}
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catch(Exception $e) {
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echo $e->getMessage() . PHP_EOL;
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pyjslib_printnl('Retry call method');
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continue;
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}
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return deserialize(fopen_and_write("php://memory", "w+b", $server_answer));
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}
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}
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function create_auth_key() {
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$nonce = random_bytes(16);
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pyjslib_printnl('Requesting pq');
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$ResPQ = $this->method_call('req_pq', ["nonce" => $nonce]);
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$server_nonce = $ResPQ['server_nonce'];
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$public_key_fingerprint = $ResPQ['server_public_key_fingerprints'][0];
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$pq_bytes = $ResPQ['pq'];
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$pq = bytes_to_long($pq_bytes);
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list($p, $q) = primefactors($pq);
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if (($p > $q)) {
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list($p, $q) = [$q, $p];
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}
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assert((($p * $q) == $pq) && ($p < $q));
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pyjslib_printnl(sprintf('Factorization %d = %d * %d', [$pq, $p, $q]));
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$p_bytes = long_to_bytes($p);
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$q_bytes = long_to_bytes($q);
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$f = pyjslib_open(__DIR__ . '/rsa.pub');
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$key = RSA::importKey($f->read());
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$new_nonce = random_bytes(32);
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$data = py2php_kwargs_function_call('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 = sha($data, true);
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$random_bytes = random_bytes(((255 - strlen($data)) - strlen($sha_digest)));
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$to_encrypt = (($sha_digest + $data) + $random_bytes);
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$encrypted_data = $key->encrypt($to_encrypt, 0) [0];
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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" => $encrypted_data]);
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assert(($nonce == $server_dh_params['nonce']));
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assert(($server_nonce == $server_dh_params['server_nonce']));
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$encrypted_answer = $server_dh_params['encrypted_answer'];
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$tmp_aes_key = (sha1(($new_nonce + $server_nonce), true) + array_slice(sha1(($server_nonce + $new_nonce), true), 0, 12 - 0));
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$tmp_aes_iv = ((array_slice(sha1(($server_nonce + $new_nonce), true), 12, 20 - 12) + sha1(($new_nonce + $new_nonce), true)) + array_slice($new_nonce, 0, 4 - 0));
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$answer_with_hash = crypt::ige_decrypt($encrypted_answer, $tmp_aes_key, $tmp_aes_iv);
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$answer_hash = array_slice($answer_with_hash, null, 20);
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$answer = array_slice($answer_with_hash, 20, null);
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$server_DH_inner_data = deserialize(io::BytesIO($answer));
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assert(($nonce == $server_DH_inner_data['nonce']));
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assert(($server_nonce == $server_DH_inner_data['server_nonce']));
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$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 = new bytes_to_long($dh_prime_str);
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$g_a = new bytes_to_long($g_a_str);
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assert(prime::isprime($dh_prime));
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$retry_id = 0;
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$b_str = random_bytes(256);
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$b = new bytes_to_long($b_str);
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$g_b = pow($g, $b, $dh_prime);
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$g_b_str = new long_to_bytes($g_b);
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$data = py2php_kwargs_function_call('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 = ($data_with_sha + random_bytes((-strlen($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 = new long_to_bytes($auth_key);
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$auth_key_sha = sha1($auth_key_str, true);
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$auth_key_aux_hash = array_slice($auth_key_sha, null, 8);
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$new_nonce_hash1 = array_slice(sha1($new_nonce . '' . $auth_key_aux_hash, true), -16, null);
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$new_nonce_hash2 = array_slice(sha1($new_nonce . '' . $auth_key_aux_hash, true), -16, null);
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$new_nonce_hash3 = array_slice(sha1($new_nonce . '' . $auth_key_aux_hash, true), -16, null);
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assert(($Set_client_DH_params_answer['nonce'] == $nonce));
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assert(($Set_client_DH_params_answer['server_nonce'] == $server_nonce));
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if (($Set_client_DH_params_answer->name == 'dh_gen_ok')) {
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assert(($Set_client_DH_params_answer['new_nonce_hash1'] == $new_nonce_hash1));
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pyjslib_printnl('Diffie Hellman key exchange processed successfully');
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$this->server_salt = new strxor(array_slice($new_nonce, 0, 8 - 0), array_slice($server_nonce, 0, 8 - 0));
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$this->auth_key = $auth_key_str;
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$this->auth_key_id = array_slice($auth_key_sha, -8, null);
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pyjslib_printnl('Auth key generated');
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return 'Auth Ok';
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} else if (($Set_client_DH_params_answer->name == 'dh_gen_retry')) {
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assert(($Set_client_DH_params_answer['new_nonce_hash2'] == $new_nonce_hash2));
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pyjslib_printnl('Retry Auth');
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} else if (($Set_client_DH_params_answer->name == 'dh_gen_fail')) {
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assert(($Set_client_DH_params_answer['new_nonce_hash3'] == $new_nonce_hash3));
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pyjslib_printnl('Auth Failed');
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throw new Exception('Auth Failed');
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} else {
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throw new Exception('Response Error');
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}
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}
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}
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function aes_calculate($msg_key, $direction = 'to server') {
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$x = ($direction == 'to server') ? 0 : 8;
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$sha1_a = sha1(($msg_key + array_slice($this->auth_key, $x, ($x + 32) - $x)), true);
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$sha1_b = sha1(((array_slice($this->auth_key, ($x + 32), ($x + 48) - ($x + 32)) + $msg_key) + array_slice($this->auth_key, (48 + $x), (64 + $x) - (48 + $x))), true);
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$sha1_c = sha1((array_slice($this->auth_key, ($x + 64), ($x + 96) - ($x + 64)) + $msg_key))->digest();
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$sha1_d = sha1(($msg_key + array_slice($this->auth_key, ($x + 96), ($x + 128) - ($x + 96))))->digest();
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$aes_key = ((array_slice($sha1_a, 0, 8 - 0) + array_slice($sha1_b, 8, 20 - 8)) + array_slice($sha1_c, 4, 16 - 4));
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$aes_iv = (((array_slice($sha1_a, 8, 20 - 8) + array_slice($sha1_b, 0, 8 - 0)) + array_slice($sha1_c, 16, 20 - 16)) + array_slice($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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