php檢測圖片木馬多進制編程實踐_PHP教程

<?php
/**
+------------------------------------------------------------------------------
* Upload 文件上傳類
+------------------------------------------------------------------------------
* @package Upload
* @author Anyon <Anyon@139.com>
* @version $Id: Upload.class.php 2013-3-20 21:47:23 Anyon $
+------------------------------------------------------------------------------
*/
class Upload {
private static $image = null;
private static $status = 0;
private static $suffix = null;
private static $imageType = array('.jpg', '.bmp','.gif','.png');
private static $message = array(
'0' => '沒有錯誤發生，文件上傳成功。',
'1' => '上傳的文件超過了 php.ini 中 upload_max_filesize 選項限制的值。',
'2' => '上傳文件的大小超過了 HTML 表單中 MAX_FILE_SIZE 選項指定的值。',
'3' => '文件只有部分被上傳。',
'4' => '沒有文件上傳。',
'5' => '未能通過安全檢查的文件。',
'6' => '找不到臨時文件夾。',
'7' => '文件寫入失敗。',
'8' => '文件類型不支持',
'9' => '上傳的臨時文件丟失。',
);
//@ 開始執行文件上傳
public static function start($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::$status]);
}
}
//@ 私有 上傳開始
private static function _upload($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::$status = 9;
}
}
//@ 私有 16進制檢測
private static function checkHex() {
if (file_exists(self::$image)) {
$resource = fopen(self::$image, 'rb');
$fileSize = filesize(self::$image);
fseek($resource, 0);
if ($fileSize > 512) { // 取頭和尾
$hexCode = bin2hex(fread($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進制中的 <% ( ) %> */
/* 匹配16進制中的 <? ( ) ?> */
/* 匹配16進制中的 <script | /script> 大小寫亦可*/
if (preg_match("/(3c25.*?28.*?29.*?253e)|(3c3f.*?28.*?29.*?3f3e)|(3C534352495054)|(2F5343524950543E)|(3C736372697074)|(2F7363726970743E)/is", $hexCode))
self::$status = 5;
else
self::$status = 0;
return self::$status;
} else {
return self::$status = 9;
}
}
//@ 私有 創建目錄
private static function umkdir($dir) {
if (!file_exists($dir) && !is_dir($dir)) {
self::umkdir(dirname($dir));
@mkdir($dir);
}
}
}