Home > php教程 > php手册 > linux防止php 伪造本地文件解决方法

linux防止php 伪造本地文件解决方法

WBOY
Release: 2016-06-13 10:12:05
Original
1096 people have browsed it

我们举例只讲linux的系统,但是防止方法在任何系统都是有效的,下面我们先来看看等操作


你可以这样使用

 代码如下 复制代码

http://www.xxx.com/index.php?page=../etc/passwd
http://www.xxx.com/index.php?page=../../../etc/passwd
http://www.xxx.com/index.php?page=..../../etc/passwd

获取更多数据:
etc/profile
etc/services
/etc/passwd
/etc/shadow
/etc/group
/etc/security/group
/etc/security/passwd
/etc/security/user
/etc/security/environ
/etc/security/limits
/usr/lib/security/mkuser.default


像上面代码,如果你是

?page=$_GET的话这样就完了,分析原因,因为我们分页只有数字,那么我们这样操作

 代码如下 复制代码

?page=intval($_GET);

这样就无法把字符提交了,我们利用了intval函数进行了过滤,那么对于提交字符怎么处理呢。

在处理字符时我们利用php自带函数的函数 addslashes和htmlspecialchars进行过滤,

 代码如下 复制代码

$body = htmlspecialchars(isset($_GET[$str])?$_GET[$str]:'');

这样就基本过滤了各种安全注入,当然如果你服务器有漏洞在php上是解决不了的。

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template