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PHP 防注入安全实现程序代码

Jun 13, 2016 am 10:12 AM
php sql code but about Safety accomplish us injection of program still

以前讲述的很多关于sql防注入的代码,但是还是得从我们的服务器脚本开始了,下面就来讲述一个下php中防注入的一些常见方法大家可参考。

最常用见的可能就是

首先将magic_quotes_gpc设置为On,display_errors设置为Off,如果id型,我们利用intval()将其转换成整数类型,如代码:
$id=intval($id);

好了下面我来介绍php提交数据过滤的基本原则 

1)提交变量进数据库时,我们必须使用addslashes()进行过滤,像我们的注入问题,一个addslashes()也就搞定了。其实在涉及到变量取值时,intval()函数对字符串的过滤也是个不错的选择。

2)在php.ini中开启magic_quotes_gpc和magic_quotes_runtime。magic_quotes_gpc可以把get,post,cookie里的引号变为斜杠。magic_quotes_runtime对于进出数据库的数据可以起到格式话的作用。其实,早在以前注入很疯狂时,这个参数就很流行了。

3)在使用系统函数时,必须使用escapeshellarg(),escapeshellcmd()参数去过滤,这样你也就可以放心的使用系统函数。

4)对于跨站,strip_tags(),htmlspecialchars()两个参数都不错,对于用户提交的的带有html和php的标记都将进行转换。比如尖括号"

 代码如下 复制代码
$new = htmlspecialchars("Test", ENT_QUOTES);
strip_tags($text,);

5)对于相关函数的过滤,就像先前的include(),unlink,fopen()等等,只要你把你所要执行操作的变量指定好或者对相关字符过滤严密,我想这样也就无懈可击了。

2、PHP简单的数据过滤

1)入库:  trim($str),addslashes($str)
2)出库:  stripslashes($str)
3)显示:  htmlspecialchars(nl2br($str))

分享一个实例

具体的代码:

 代码如下 复制代码

   //security.php
/**
 * @author zhengwei
 * @copyright 2007
 */

/*
函数名称:inject_check()
函数作用:检测提交的值是不是含有SQL注射的字符,防止注射,保护服务器安全
参  数:$sql_str: 提交的变量
返 回 值:返回检测结果,ture or false
函数作者:heiyeluren
*/
function inject_check($sql_str) { 
  return eregi('select|insert|update|delete|'|/*|*|../|./|union|into|load_file|outfile', $sql_str);    // 进行过滤 

 
/*
函数名称:verify_id()
函数作用:校验提交的ID类值是否合法
参  数:$id: 提交的ID值
返 回 值:返回处理后的ID
函数作者:heiyeluren
*/
function verify_id($id=null) { 
  if (!$id) { exit('没有提交参数!'); }    // 是否为空判断 
  elseif (inject_check($id)) { exit('提交的参数非法!'); }    // 注射判断 
  elseif (!is_numeric($id)) { exit('提交的参数非法!'); }    // 数字判断 
  $id = intval($id);    // 整型化 
 
  return  $id; 

 
/*
函数名称:str_check()
函数作用:对提交的字符串进行过滤
参  数:$var: 要处理的字符串
返 回 值:返回过滤后的字符串
函数作者:heiyeluren
*/
function str_check( $str ) { 
  if (!get_magic_quotes_gpc()) {    // 判断magic_quotes_gpc是否打开 
    $str = addslashes($str);    // 进行过滤 
  } 
  $str = str_replace("_", "_", $str);    // 把 '_'过滤掉 
  $str = str_replace("%", "%", $str);    // 把 '%'过滤掉 
 
  return $str;  

 
/*
函数名称:post_check()
函数作用:对提交的编辑内容进行处理
参  数:$post: 要提交的内容
返 回 值:$post: 返回过滤后的内容
函数作者:heiyeluren
*/
function post_check($post) { 
  if (!get_magic_quotes_gpc()) {    // 判断magic_quotes_gpc是否为打开 
    $post = addslashes($post);    // 进行magic_quotes_gpc没有打开的情况对提交数据的过滤 
  } 
  $post = str_replace("_", "_", $post);    // 把 '_'过滤掉 
  $post = str_replace("%", "%", $post);    // 把 '%'过滤掉 
  $post = nl2br($post);    // 回车转换 
  $post = htmlspecialchars($post);    // html标记转换 
 
  return $post; 


foreach ($_POST as $post_key=>$post_var)
{
 if (is_numeric($post_var)) {
  $post[strtolower($post_key)] = get_int($post_var);
 } else {
  $post[strtolower($post_key)] = get_str($post_var);
 }
}

/* 过滤函数 */
//整型过滤函数
function get_int($number)
{
    return intval($number);
}
//字符串型过滤函数
function get_str($string)
{
    if (!get_magic_quotes_gpc()) {
 return addslashes($string);
    }
    return $string;
}

?>

在有些cms中我会看到

foreach($HTTP_POST_VARS as $key=>$value){
$ArrPostAndGet[]=$value;
}
foreach($HTTP_GET_VARS as $key=>$value){
$ArrPostAndGet[]=$value;
}


 

这个的代码然后在所有页面都加载这个函数,这样过滤个人发现好像上传文件时会有问题哦。

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