限定user_agent

当服务器被攻击，并且查看到攻击的user_agent有规律，这时就需要限制user_agent

user_agent配置如下

[root@chy 111.com]# vim /usr/local/apache2.4/conf/extra/httpd-vhosts.conf 
 <IfModule mod_rewrite.c>
        RewriteEngine on
        RewriteCond %{HTTP_USER_AGENT}  .*curl.* [NC,OR]
        RewriteCond %{HTTP_USER_AGENT}  .*baidu.com.* [NC]
        RewriteRule  .*  -  [F]
    </IfModule>
(增加如上配置，配置详解如下： <IfModule mod_rewrite.c> （这里需要用到rewrite模块）
        RewriteEngine on
        RewriteCond %{HTTP_USER_AGENT}  .*curl.* [NC,OR] （OR是或者的意思，或者匹配curl,或者匹配baidu.com)(NC忽略大小写)
        RewriteCond %{HTTP_USER_AGENT}  .*baidu.com.* [NC]
        RewriteRule  .*  -  [F]（F的含义‘forbidden  F’ (force URL to be forbidden)重写为禁止访问
    </IfModule>

测试user_agent

# curl -A "chylinux chylinux" -x192.168.212.10:80 'http://www.111.com/123.php' -IDate: Thu, 03 Aug 2017 22:43:50 GMTServer: Apache/2.4.27 (Unix) PHP/5.6.30X-Powered-By: PHP/5.6.30Content-Type: text/html; charset=UTF-8# curl  -x192.168.212.10:80 'http://www.111.com/123.php' -IDate: Thu, 03 Aug 2017 22:53:09 GMTServer: Apache/2.4.27 (Unix) PHP/5.6.30Content-Type: text/html; charset=iso-8859-1"http//"，如需转载请自行联系原作者