您的位置 首页 php

php预防sql注入和xss攻击

function xss_clean($data)
{
 // Fix &entity\n;
 $data=str_replace(array('&','<','>'),array('&','<','>'),$data);
 $data=preg_replace('/(&#*\w+)[\x00-\x20]+;/u','$1;',$data);
 $data=preg_replace('/(&#x*[0-9A-F]+);*/iu','$1;',$data);
 $data=html_entity_decode($data,ENT_COMPAT,'UTF-8');
 // Remove any attribute starting with "on" or xmlns
 $data=preg_replace('#(<[^>]+?[\x00-\x20"\'])(?:on|xmlns)[^>]*+>#iu','$1>',$data);
 // Remove javascript: and vbscript: protocols
 $data=preg_replace('#([a-z]*)[\x00-\x20]*=[\x00-\x20]*([`\'"]*)[\x00-\x20]*j[\x00-\x20]*a[\x00-\x20]*v[\x00-\x20]*a[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu','$1=$2nojavascript...',$data);
 $data=preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*v[\x00-\x20]*b[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu','$1=$2novbscript...',$data);
 $data=preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*-moz-binding[\x00-\x20]*:#u','$1=$2nomozbinding...',$data);
 // Only works in IE: <span style="width: expression(alert('Ping!'));"></span>
 $data=preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?expression[\x00-\x20]*\([^>]*+>#i','$1>',$data);
 $data=preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?behaviour[\x00-\x20]*\([^>]*+>#i','$1>',$data);
 $data=preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:*[^>]*+>#iu','$1>',$data);
 // Remove namespaced elements (we do not need them)
 $data=preg_replace('#</*\w+:\w[^>]*+>#i','',$data);
 do
 {
 // Remove really unwanted tags
 	 $old_data=$data;
 $data=preg_replace('#</*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^>]*+>#i','',$data);
 }while($old_data!==$data);
 // we are done...
 return $data;
} 

//php防注入和XSS攻击通用过滤. 
 
function SafeFilter (&$arr) 
{
 
 $ra=Array('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/','/script/','/javascript/','/vbscript/','/expression/','/applet/','/meta/','/xml/','/blink/','/link/','/style/','/embed/','/object/','/frame/','/layer/','/title/','/bgsound/','/base/','/onload/','/onunload/','/onchange/','/onsubmit/','/onreset/','/onselect/','/onblur/','/onfocus/','/onabort/','/onkeydown/','/onkeypress/','/onkeyup/','/onclick/','/ondblclick/','/onmousedown/','/onmousemove/','/onmouseout/','/onmouseover/','/onmouseup/','/onunload/');
 
 if (is_array($arr))
 {
  foreach  ($arr as $key => $value) 
 {
 if (!is_array($value))
 {
 if (!get_magic_quotes_gpc()) //不对magic_quotes_gpc转义过的字符使用addslashes(),避免双重转义。
 {
 $value = addslashes($value); //给 单引号 (')、 双引号 (")、反斜线(\)与 NUL(NULL 字符)加上反斜线转义
 }
 $value = preg_replace($ra,'',$value); //删除非打印字符,粗暴式过滤xss可疑字符串
 $arr[$key] = htmlentities(strip_tags($value)); //去除 HTML 和 PHP 标记并转换为 HTML 实体
 }
 else
 {
 SafeFilter($arr[$key]);
 }
 }
 }
} 

文章来源:智云一二三科技

文章标题:php预防sql注入和xss攻击

文章地址:https://www.zhihuclub.com/80445.shtml

关于作者: 智云科技

热门文章

发表评论

您的电子邮箱地址不会被公开。

网站地图