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PHP脚本木马的高级防范

Jun 21, 2016 am 09:07 AM
apache exec php unlink

高级|脚本|木马

【摘 要】 介绍PHP脚本木马的高级防范,防止php木马执行webshell,防止php木马读写文件目录文章专题
1、防止跳出web目录


首先修改httpd.conf,如果你只允许你的php脚本程序在web目录里操作,还可以修改httpd.conf文件限制php的操作路径。比如你的web目录是/usr/local/apache/htdocs,那么在httpd.conf里加上这么几行:


php_admin_value open_basedir /usr/local/apache/htdocs


这样,如果脚本要读取/usr/local/apache/htdocs以外的文件将不会被允许,如果错误显示打开的话会提示这样的错误:


Warning: open_basedir restriction in effect. File is in wrong directory in /usr/local/apache/htdocs/open.php on line 4 等等。


2、防止php木马执行webshell


打开safe_mode,


在,php.ini中设置


disable_functions= passthru,exec,shell_exec,system


二者选一即可,也可都选


3、防止php木马读写文件目录


在php.ini中的


disable_functions= passthru,exec,shell_exec,system


后面加上php处理文件的函数


主要有


fopen,mkdir,rmdir,chmod,unlink,dir


fopen,fread,fclose,fwrite,file_exists

closedir,is_dir,readdir.opendir


fileperms.copy,unlink,delfile


即成为


disable_functions= passthru,exec,shell_exec,system,fopen,mkdir,rmdir,chmod,unlink,dir


,fopen,fread,fclose,fwrite,file_exists


,closedir,is_dir,readdir.opendir


,fileperms.copy,unlink,delfile


ok,大功告成,php木马拿我们没辙了,遗憾的是这样的话,利用文本数据库的那些东西就都不能用了。


如果是在windos平台下搭建的apache我们还需要注意一点,apache默认运行是system权限,这很恐怖,这让人感觉很不爽.那我们就给apache降降权限吧。


net user apache fuckmicrosoft /add


net localgroup users apache /del


ok.我们建立了一个不属于任何组的用户apche。


我们打开计算机管理器,选服务,点apache服务的属性,我们选择log on,选择this account,我们填入上面所建立的账户和密码,重启apache服务,ok,apache运行在低权限下了。

实际上我们还可以通过设置各个文件夹的权限,来让apache用户只能执行我们想让它能干的事情,给每一个目录建立一个单独能读写的用户。这也是当前很多虚拟主机提供商的流行配置方法哦,不过这种方法用于防止这里就显的有点大材小用了。



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