Commit message: Fix bug #74782: remove file name from output to avoid XSS

(cherry picked from commit 73ca9b37731dd9690ffd9706333b17eaf90ea091)
CVE: CVE-2018-5712
CWE: CWE-79
Vulnerability description: An issue was discovered in PHP before 5.6.33, 7.0.x before 7.0.27, 7.1.x before 7.1.13, and 7.2.x before 7.2.1. There is Reflected XSS on the PHAR 404 error page via the URI of a request for a .phar file.

Project: php-src
File: stub.h

static inline zend_string* phar_get_stub(const char *index_php, const char *web, const int name_len, const int web_len)
{
	static const char newstub0[] = "<?php\n\n$web = '";
	static const char newstub1_0[] = "';\n\nif (in_array('phar', stream_get_wrappers()) && class_exists('Phar', 0)) {\nPhar::interceptFileFuncs();\nset_include_path('phar://' . __FILE__ . PATH_SEPARATOR . get_include_path());\nPhar::webPhar(null, $web);\ninclude 'phar://' . __FILE__ . '/' . Extract_Phar::START;\nreturn;\n}\n\nif (@(isset($_SERVER['REQUEST_URI']) && isset($_SERVER['REQUEST_METHOD']) && ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SERVER['REQUEST_METHOD'] == 'POST'))) {\nExtract_Phar::go(true);\n$mimes = array(\n'phps' => 2,\n'c' => 'text/plain',\n'cc' => 'text/plain',\n'cpp' => 'text/plain',\n'c++' => 'text/plain',\n'dtd' => 'text/plain',\n'h' => 'text/plain',\n'log' => 'text/plain',\n'rng' => 'text/plain',\n'txt' => 'text/plain',\n'xsd' => 'text/plain',\n'php' => 1,\n'inc' => 1,\n'avi' => 'video/avi',\n'bmp' => 'image/bmp',\n'css' => 'text/css',\n'gif' => 'image/gif',\n'htm' => 'text/html',\n'html' => 'text/html',\n'htmls' => 'text/html',\n'ico' => 'image/x-ico',\n'jpe' => 'image/jpeg',\n'jpg' => 'image/jpeg',\n'jpeg' => 'image/jpeg',\n'js' => 'application/x-javascript',\n'midi' => 'audio/midi',\n'mid' => 'audio/midi',\n'mod' => 'audio/mod',\n'mov' => 'movie/quicktime',\n'mp3' => 'audio/mp3',\n'mpg' => 'video/mpeg',\n'mpeg' => 'video/mpeg',\n'pdf' => 'application/pdf',\n'png' => 'image/png',\n'swf' => 'application/shockwave-flash',\n'tif' => 'image/tiff',\n'tiff' => 'image/tiff',\n'wav' => 'audio/wav',\n'xbm' => 'image/xbm',\n'xml' => 'text/xml',\n);\n\nheader(\"Cache-Control: no-cache, must-revalidate\");\nheader(\"Pragma: no-cache\");\n\n$basename = basename(__FILE__);\nif (!strpos($_SERVER['REQUEST_URI'], $basename)) {\nchdir(Extract_Phar::$temp);\ninclude $web;\nreturn;\n}\n$pt = substr($_SERVER['REQUEST_URI'], strpos($_SERVER['REQUEST_URI'], $basename) + strlen($basename));\nif (!$pt || $pt == '/') {\n$pt = $web;\nheader('HTTP/1.1 301 Moved Permanently');\nheader('Location: ' . $_SERVER['REQUEST_URI'] . '/' . $pt);\nexit;\n}\n$a = realpath(Extract_Phar::$temp . DIRECTORY_SEPARATOR . $pt);\nif (!$a || strlen(dirname($a)) < strlen(";
	static const char newstub1_1[] = "Extract_Phar::$temp)) {\nheader('HTTP/1.0 404 Not Found');\necho \"<html>\\n <head>\\n  <title>File Not Found<title>\\n </head>\\n <body>\\n  <h1>404 - File Not Found</h1>\\n </body>\\n</html>\";\nexit;\n}\n$b = pathinfo($a);\nif (!isset($b['extension'])) {\nheader('Content-Type: text/plain');\nheader('Content-Length: ' . filesize($a));\nreadfile($a);\nexit;\n}\nif (isset($mimes[$b['extension']])) {\nif ($mimes[$b['extension']] === 1) {\ninclude $a;\nexit;\n}\nif ($mimes[$b['extension']] === 2) {\nhighlight_file($a);\nexit;\n}\nheader('Content-Type: ' .$mimes[$b['extension']]);\nheader('Content-Length: ' . filesize($a));\nreadfile($a);\nexit;\n}\n}\n\nclass Extract_Phar\n{\nstatic $temp;\nstatic $origdir;\nconst GZ = 0x1000;\nconst BZ2 = 0x2000;\nconst MASK = 0x3000;\nconst START = '";
	static const char newstub2[] = "';\nconst LEN = ";
	static const char newstub3_0[] = ";\n\nstatic function go($return = false)\n{\n$fp = fopen(__FILE__, 'rb');\nfseek($fp, self::LEN);\n$L = unpack('V', $a = fread($fp, 4));\n$m = '';\n\ndo {\n$read = 8192;\nif ($L[1] - strlen($m) < 8192) {\n$read = $L[1] - strlen($m);\n}\n$last = fread($fp, $read);\n$m .= $last;\n} while (strlen($last) && strlen($m) < $L[1]);\n\nif (strlen($m) < $L[1]) {\ndie('ERROR: manifest length read was \"' .\nstrlen($m) .'\" should be \"' .\n$L[1] . '\"');\n}\n\n$info = self::_unpack($m);\n$f = $info['c'];\n\nif ($f & self::GZ) {\nif (!function_exists('gzinflate')) {\ndie('Error: zlib extension is not enabled -' .\n' gzinflate() function needed for zlib-compressed .phars');\n}\n}\n\nif ($f & self::BZ2) {\nif (!function_exists('bzdecompress')) {\ndie('Error: bzip2 extension is not enabled -' .\n' bzdecompress() function needed for bz2-compressed .phars');\n}\n}\n\n$temp = self::tmpdir();\n\nif (!$temp || !is_writable($temp)) {\n$sessionpath = session_save_path();\nif (strpos ($sessionpath, \";\") !== false)\n$sessionpath = substr ($sessionpath, strpos ($sessionpath, \";\")+1);\nif (!file_exists($sessionpath) || !is_dir($sessionpath)) {\ndie('Could not locate temporary directory to extract phar');\n}\n$temp = $sessionpath;\n}\n\n$temp .= '/pharextract/'.basename(__FILE__, '.phar');\nself::$temp = $temp;\nself::$origdir = getcwd();\n@mkdir($temp, 0777, true);\n$temp = realpath($temp);\n\nif (!file_exists($temp . DIRECTORY_SEPARATOR . md5_file(__FILE__))) {\nself::_removeTmpFiles($temp, getcwd());\n@mkdir($temp, 0777, true);\n@file_put_contents($temp . '/' . md5_file(__FILE__), '');\n\nforeach ($info['m'] as $path => $file) {\n$a = !file_exists(dirname($temp . '/' . $path));\n@mkdir(dirname($temp . '/' . $path), 0777, true);\nclearstatcache();\n\nif ($path[strlen($path) - 1] == '/') {\n@mkdir($temp . '/' . $path, 0777);\n} else {\nfile_put_contents($temp . '/' . $path, self::extractFile($path, $file, $fp));\n@chmod($temp . '/' . $path, 0666);\n}\n}\n}\n\nchdir($temp);\n\nif (!$return) {\ninclude self::START;\n}\n}\n\nstatic fun";
	static const char newstub3_1[] = "ction tmpdir()\n{\nif (strpos(PHP_OS, 'WIN') !== false) {\nif ($var = getenv('TMP') ? getenv('TMP') : getenv('TEMP')) {\nreturn $var;\n}\nif (is_dir('/temp') || mkdir('/temp')) {\nreturn realpath('/temp');\n}\nreturn false;\n}\nif ($var = getenv('TMPDIR')) {\nreturn $var;\n}\nreturn realpath('/tmp');\n}\n\nstatic function _unpack($m)\n{\n$info = unpack('V', substr($m, 0, 4));\n $l = unpack('V', substr($m, 10, 4));\n$m = substr($m, 14 + $l[1]);\n$s = unpack('V', substr($m, 0, 4));\n$o = 0;\n$start = 4 + $s[1];\n$ret['c'] = 0;\n\nfor ($i = 0; $i < $info[1]; $i++) {\n $len = unpack('V', substr($m, $start, 4));\n$start += 4;\n $savepath = substr($m, $start, $len[1]);\n$start += $len[1];\n   $ret['m'][$savepath] = array_values(unpack('Va/Vb/Vc/Vd/Ve/Vf', substr($m, $start, 24)));\n$ret['m'][$savepath][3] = sprintf('%u', $ret['m'][$savepath][3]\n& 0xffffffff);\n$ret['m'][$savepath][7] = $o;\n$o += $ret['m'][$savepath][2];\n$start += 24 + $ret['m'][$savepath][5];\n$ret['c'] |= $ret['m'][$savepath][4] & self::MASK;\n}\nreturn $ret;\n}\n\nstatic function extractFile($path, $entry, $fp)\n{\n$data = '';\n$c = $entry[2];\n\nwhile ($c) {\nif ($c < 8192) {\n$data .= @fread($fp, $c);\n$c = 0;\n} else {\n$c -= 8192;\n$data .= @fread($fp, 8192);\n}\n}\n\nif ($entry[4] & self::GZ) {\n$data = gzinflate($data);\n} elseif ($entry[4] & self::BZ2) {\n$data = bzdecompress($data);\n}\n\nif (strlen($data) != $entry[0]) {\ndie(\"Invalid internal .phar file (size error \" . strlen($data) . \" != \" .\n$stat[7] . \")\");\n}\n\nif ($entry[3] != sprintf(\"%u\", crc32($data) & 0xffffffff)) {\ndie(\"Invalid internal .phar file (checksum error)\");\n}\n\nreturn $data;\n}\n\nstatic function _removeTmpFiles($temp, $origdir)\n{\nchdir($temp);\n\nforeach (glob('*') as $f) {\nif (file_exists($f)) {\nis_dir($f) ? @rmdir($f) : @unlink($f);\nif (file_exists($f) && is_dir($f)) {\nself::_removeTmpFiles($f, getcwd());\n}\n}\n}\n\n@rmdir($temp);\nclearstatcache();\nchdir($origdir);\n}\n}\n\nExtract_Phar::go();\n__HALT_COMPILER(); ?>";

	static const int newstub_len = 6623;

	return strpprintf(name_len + web_len + newstub_len, "%s%s%s%s%s%s%d%s%s", newstub0, web, newstub1_0, newstub1_1, index_php, newstub2, name_len + web_len + newstub_len, newstub3_0, newstub3_1);
}