实践php检测图片木马

实践php检测图片木马

<?php 
/**
  +------------------------------------------------------------------------------
* Upload 文件上传类
  +------------------------------------------------------------------------------
* @package   Upload
* @author    nicegy 
* @version   $Id: Upload.class.php 2014-4-11 19:00:23 nicegy $
  +------------------------------------------------------------------------------
*/
class Upload {
 
      private static $image = null;
      private static $status = 0;
      private static $suffix = null;
      private static $imageType = array(‘.jpg‘, ‘.bmp‘,‘.gif‘,‘.png‘);
      private static $message = array(
            ‘0‘ => ‘没有错误发生，文件上传成功。‘,
            ‘1‘ => ‘上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。‘,
            ‘2‘ => ‘上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。‘,
            ‘3‘ => ‘文件只有部分被上传。‘,
            ‘4‘ => ‘没有文件上传。‘,
            ‘5‘ => ‘未能通过安全检查的文件。‘,
            ‘6‘ => ‘找不到临时文件夹。‘,
            ‘7‘ => ‘文件写入失败。‘,
            ‘8‘ => ‘文件类型不支持‘,
            ‘9‘ => ‘上传的临时文件丢失。‘,
      );
 
      //@ 开始执行文件上传
      public static function start($feild = ‘file‘) {
            if (!empty($_FILES)) {
                self::$status = $_FILES[$feild][‘error‘];
               if (self::$status > 0)
                      return array(‘status‘ => self::$status, ‘msg‘ => self::$message[self::$status]);
                  self::$image = $_FILES[$feild][‘tmp_name‘];
                  self::$suffix = strtolower(strrchr($_FILES[$feild][‘name‘], ‘.‘));
                  return array(‘status‘ => self::_upload(), ‘path‘ => self::$image, ‘msg‘ => self::$message[self::$status]);
           } else {
                  return array(‘status‘ => self::$status, ‘msg‘ => self::$message[self::$status]);
           }
}
 
    //@ 私有 上传开始
    private static function _upload($path = ‘./upload/‘) {
        date_default_timezone_set(‘PRC‘);
        $newFile = $path . date(‘Y/m/d/His‘) . rand(100, 999) . self::$suffix;
        self::umkdir(dirname($newFile));
        if (is_uploaded_file(self::$image) && move_uploaded_file(self::$image, $newFile)) {
            self::$image = $newFile;
            if (in_array(self::$suffix, self::$imageType))
                return self::checkHex();
            else
                return self::$status = 0;
        } else {
            return self::$status = 9;
        }
    }
 
    //@ 私有 16进制检测 黑客
    private static function checkHex() {
        if (file_exists(self::$image)) {
            $resource = fopen(self::$image, ‘rb‘);
            $fileSize = filesize(self::$image);
            fseek($resource, 0);
            if ($fileSize > 512) { // 取头和尾
                $hexCode = bin2hex(fread($resource, 512));
                fseek($resource, $fileSize - 512);
                $hexCode .= bin2hex(fread($resource, 512));
            } else { // 取全部
                $hexCode = bin2hex(fread($resource, $fileSize));
            }
            fclose($resource);
            /* 匹配16进制中的 */
            /* 匹配16进制中的 */
            /* 匹配16进制中的

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