Annotation of embedaddon/php/ext/phar/tests/tar/files/make.dangerous.tar.php.inc, revision 1.1
1.1 ! misho 1: <?php
! 2: // stolen from PEAR2_Pyrus_Developer_Creator_Tar by Greg Beaver, the original author, for use in unit tests
! 3: // this tarmaker makes a malicious tar with a header designed to overflow the buffer
! 4: class danger_tarmaker
! 5: {
! 6: /**
! 7: * Path to archive file
! 8: *
! 9: * @var string
! 10: */
! 11: protected $archive;
! 12: /**
! 13: * Temporary stream used for creating the archive
! 14: *
! 15: * @var stream
! 16: */
! 17: protected $tmp;
! 18: protected $path;
! 19: protected $compress;
! 20: function __construct($path, $compress = 'zlib')
! 21: {
! 22: $this->compress = $compress;
! 23: if ($compress === 'bz2' && !function_exists('bzopen')) {
! 24: throw new PEAR2_Pyrus_Developer_Creator_Exception(
! 25: 'bzip2 extension not available');
! 26: }
! 27: if ($compress === 'zlib' && !function_exists('gzopen')) {
! 28: throw new PEAR2_Pyrus_Developer_Creator_Exception(
! 29: 'zlib extension not available');
! 30: }
! 31: $this->path = $path;
! 32: }
! 33:
! 34: /**
! 35: * save a file inside this package
! 36: *
! 37: * This code is modified from Vincent Lascaux's File_Archive
! 38: * package, which is licensed under the LGPL license.
! 39: * @param string relative path within the package
! 40: * @param string|resource file contents or open file handle
! 41: */
! 42: function addFile($path, $fileOrStream, $stat = null)
! 43: {
! 44: clearstatcache();
! 45: if ($stat === null) {
! 46: if (is_resource($fileOrStream)) {
! 47: $stat = fstat($fileOrStream);
! 48: } else {
! 49: $stat = array(
! 50: 'mode' => 0x8000 + 0644,
! 51: 'uid' => 0,
! 52: 'gid' => 0,
! 53: 'size' => strlen($fileOrStream),
! 54: 'mtime' => time(),
! 55: );
! 56: }
! 57: }
! 58:
! 59: $link = null;
! 60: if ($stat['mode'] & 0x4000) {
! 61: $type = 5; // Directory
! 62: } else if ($stat['mode'] & 0x8000) {
! 63: $type = 0; // Regular
! 64: } else if ($stat['mode'] & 0xA000) {
! 65: $type = 1; // Link
! 66: $link = @readlink($current);
! 67: } else {
! 68: $type = 9; // Unknown
! 69: }
! 70:
! 71: $filePrefix = '';
! 72: if (strlen($path) > 255) {
! 73: throw new Exception(
! 74: "$path is too long, must be 255 characters or less"
! 75: );
! 76: } else if (strlen($path) > 100) {
! 77: $filePrefix = substr($path, 0, strlen($path)-100);
! 78: $path = substr($path, -100);
! 79: }
! 80:
! 81: $block = pack('a100a8a8a8a12A12',
! 82: $path,
! 83: '12345678', // have a mode that allows the name to overflow
! 84: sprintf('%6s ',decoct($stat['uid'])),
! 85: sprintf('%6s ',decoct($stat['gid'])),
! 86: sprintf('%11s ',decoct($stat['size'])),
! 87: sprintf('%11s ',decoct($stat['mtime']))
! 88: );
! 89:
! 90: $blockend = pack('a1a100a6a2a32a32a8a8a155a12',
! 91: $type,
! 92: $link,
! 93: 'ustar',
! 94: '00',
! 95: 'Pyrus',
! 96: 'Pyrus',
! 97: '',
! 98: '',
! 99: $filePrefix,
! 100: '123456789abc'); // malicious block
! 101:
! 102: $checkheader = array_merge(str_split($block), str_split($blockend));
! 103: if (!function_exists('_pear2tarchecksum')) {
! 104: function _pear2tarchecksum($a, $b) {return $a + ord($b);}
! 105: }
! 106: $checksum = 256; // 8 * ord(' ');
! 107: $checksum += array_reduce($checkheader, '_pear2tarchecksum');
! 108:
! 109: $checksum = pack('a8', sprintf('%6s ', decoct($checksum)));
! 110:
! 111: fwrite($this->tmp, (binary)$block . $checksum . $blockend, 512);
! 112: if (is_resource($fileOrStream)) {
! 113: stream_copy_to_stream($fileOrStream, $this->tmp);
! 114: if ($stat['size'] % 512) {
! 115: fwrite($this->tmp, (binary)str_repeat("\0", 512 - $stat['size'] % 512));
! 116: }
! 117: } else {
! 118: fwrite($this->tmp, (binary)$fileOrStream);
! 119: if (strlen($fileOrStream) % 512) {
! 120: fwrite($this->tmp, (binary)str_repeat("\0", 512 - strlen($fileOrStream) % 512));
! 121: }
! 122: }
! 123: }
! 124:
! 125: /**
! 126: * Initialize the package creator
! 127: */
! 128: function init()
! 129: {
! 130: switch ($this->compress) {
! 131: case 'zlib' :
! 132: $this->tmp = gzopen($this->path, 'wb');
! 133: break;
! 134: case 'bz2' :
! 135: $this->tmp = bzopen($this->path, 'w');
! 136: break;
! 137: case 'none' :
! 138: $this->tmp = fopen($this->path, 'wb');
! 139: break;
! 140: default :
! 141: throw new Exception(
! 142: 'unknown compression type ' . $this->compress);
! 143: }
! 144: }
! 145:
! 146: /**
! 147: * Create an internal directory, creating parent directories as needed
! 148: *
! 149: * @param string $dir
! 150: */
! 151: function mkdir($dir)
! 152: {
! 153: $this->addFile($dir, "", array(
! 154: 'mode' => 0x4000 + 0644,
! 155: 'uid' => 0,
! 156: 'gid' => 0,
! 157: 'size' => 0,
! 158: 'mtime' => time(),
! 159: ));
! 160: }
! 161:
! 162: /**
! 163: * Finish saving the package
! 164: */
! 165: function close()
! 166: {
! 167: fwrite($this->tmp, pack('a1024', ''));
! 168: fclose($this->tmp);
! 169: }
! 170: }
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