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配置Nginx 拒绝代理访问

Jun 07, 2016 pm 04:39 PM
nginx acting reject Simple structure access Talk about it Configuration

先大概说说简单的结构前端一个Nginx反向代理,后端一个Nginx instance app for PHP实际上就是个Discuz,之前面对CC攻击都是预警脚本或者走CDN,但是这次攻击者不再打流量,而是针对数据库请求页面进行攻击,如search操作帖子ID F5等..从日志分析来看是从3个U

先大概说说简单的结构…前端一个Nginx反向代理,后端一个Nginx instance app for PHP…实际上就是个Discuz,之前面对CC攻击都是预警脚本或者走CDN,但是这次攻击者不再打流量,而是针对数据库请求页面进行攻击,如search操作…帖子ID F5等..从日志分析来看是从3个URL着手攻击的,当时使用Nginx 匹配$query_string 来return 503…不过会导致页面不能访问,所以想到这么一个折中的办法。

首先你看一段代理请求的日志:

##通过分析,在后端发现其代理访问过来的数据都是两个IP的,默认情况下直接访问获取真实IP,其IP只有一个,而通过手机 3G\4G上网则是2个IP,不过有匿名IP的话,到服务器则只有一个IP,这种就不太好判断了...
[root@ipython conf]# tail -f /var/log/nginx/logs/access.log  | grep ahtax
120.193.47.34 - - [26/Sep/2014:23:34:44 +0800] "GET /ahtax/index.html HTTP/1.0" 503 1290 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36" "10.129.1.254, 120.193.47.34"
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使用PHP分析下访问时的_SERVER变量

[root@ipython conf]# cat /%path%/self_.php
<!--?php 
if ($_SERVER["HTTP_X_FORWARDED_FOR"]!="")
{
    $user_ip=$_SERVER["HTTP_X_FORWARDED_FOR"];
}elseif($_SERVER["HTTP_X_REAL_IP"]!=""){
    $user_ip=$_SERVER["HTTP_X_REAL_IP"];
}else{
        $user_ip=$_SERVER["REMOTE_ADDR"];
}
echo $user_ip."
<?php
if ($_SERVER["HTTP_X_FORWARDED_FOR"]!="")
{
??? $user_ip=$_SERVER["HTTP_X_FORWARDED_FOR"];
}elseif($_SERVER["HTTP_X_REAL_IP"]!=""){
??? $user_ip=$_SERVER["HTTP_X_REAL_IP"];
}else{
??????? $user_ip=$_SERVER["REMOTE_ADDR"];
}
echo $user_ip."";
??????? foreach($_SERVER as $key=>$value)
??????????????? echo $key."\t"."$value"."";
?>
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通过浏览器访问确认相关参数

nginx-reject-proxy

nginx-reject-proxy

有了这个特征就很好判断了….

首先需要有一个正则来匹配日志里的两个IP,Nginx正则依赖pcre库...
[root@ipython conf]# pcretest 
PCRE version 7.8 2008-09-05
  re> '^\d+.\d+.\d+.\d+\W\s\d+.\d+.\d+.\d+$'
data> 192.168.1.1, 1.1.1.1
 0: 192.168.1.1, 1.1.1.1
Nginx配置文件在location $dir 中加入条件来匹配http_x_forwarded_for:
#proxy
if ($http_x_forwarded_for ~ '^\d+.\d+.\d+.\d+\W\s\d+.\d+.\d+.\d+$'){
    return 503;
}
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重载配置后就可以限制使用代理IP来访问的网站用户了

nginx-reject-proxy1

nginx-reject-proxy1

 

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