我已经好久没有写点东西了,主要是因为最近实在是太忙了,有个白痴天天用webbench攻击公司的服务器.
俗话说得好,久病成医,今天我这个蒙古大夫就分享一下自动防攻击的部分.
首先我来说一下这个被攻击的网站的大概部署状况.这个网站主要是nginx+mysql+php,有两台服务器分别放了web和数据库,web只对外开启了80端口操作系统是centos,而数据库服务器则在内网,攻击者的手段其实很简单,用webbench网站压力测试工具发送大量的请求到服务器,之前的时候发送每一个请求之后数据库就会相应,然后读取内容最终显示,造成数据库和web之间大量的交换数据,甚至导致mysql达到连接数上限,请求被拒绝,而且攻击者时间挺多的,他不停地换浮动ip,因此直接用防火墙封锁ip没意义.
刚开始我的做法是,用php取得攻击者的agent头,判断是不是webbench来访,如果是就die掉,不在请求数据库,确实挺有效,数据库不会再超出限制了,但是对方频繁的发送请求过来,导致网络带宽被严重消耗,看来得想想其他办法,最终想到了一个解决方法且实际测试发现可行,因此分享给大家,其实我的做法原理很简单:用php取得用户agent头判断是否是webbench来源,如果是的话就在服务器上写一个shell档案,这个档案的内容就是封锁IP的规则,然后再用chmod函数修改一下这个档案让其可执行,再用cron服务读取这个档案执行,把ip封锁掉,整个过程全部自动化完成不需要人为干预,另外在封锁的时候给我发一封email通知我有个倒霉蛋被干掉了,这样就行了.
具体实现代码如下:
IF(isSet($_SERVER['HTTP_USER_AGENT']) And Trim($_SERVER['HTTP_USER_AGENT'])!='') { $_SERVER['HTTP_USER_AGENT']=StrToLower($_SERVER['HTTP_USER_AGENT']); IF(StriStr($_SERVER['HTTP_USER_AGENT'],'webbench')!==False) { $p='/home/www/webbench.sh'; $_SERVER['REMOTE_ADDR']=isSet($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknow'; File_Put_Contents($p,"#!/bin/bash\niptables -I INPUT -s {$_SERVER['REMOTE_ADDR']} -j DROP;\n",LOCK_EX); Chmod($p,0755); chown($p,'www'); Function sMail($to,$tit,$msg) { IF(Filter_var($to,FILTER_VALIDATE_EMAIL)==''){ throw new Exception('??地址??!'); } $tit='=?UTF-8?B?'.Base64_Encode($tit).'?='; $msg = str_replace("\n.","\n..",$msg); //Windows如果在一行开头发现一个句号则会被删掉,要避免此问题将单个句号替换成两个句号 Return Mail($to,$tit,$msg,'From:No-reply@adm.bossadm.com.tw'."\n".'Content-Type:text/html;charset=utf-8'); } sMail('see7di@gmail.com','【WebBench又?始了-by http://www.7di.net】!',date('Y-m-d H:i:s',time())." {$_SERVER['REMOTE_ADDR']}"); Header('Location:http://127.0.0.1'); Die(); }}
後?我又做了一次?整,把?email的部份?入了shell文件?,不再用php?email,因?那?灌爆你的信箱,把上?的代?修改成:
IF(isSet($_SERVER['HTTP_USER_AGENT']) And Trim($_SERVER['HTTP_USER_AGENT'])!='') { $_SERVER['HTTP_USER_AGENT']=StrToLower($_SERVER['HTTP_USER_AGENT']); IF(StriStr($_SERVER['HTTP_USER_AGENT'],'webbench')!==False) { $p='/home/www/webbench.sh'; $_SERVER['REMOTE_ADDR']=isSet($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknow'; File_Put_Contents($p,"#!/bin/bash\niptables -I INPUT -s {$_SERVER['REMOTE_ADDR']} -j DROP;\necho \"{$_SERVER['REMOTE_ADDR']} - `date`\" | mail -s \"WebBench-www.7di.net\" see7di@gmail.com\n",LOCK_EX); Chmod($p,0755); chown($p,'www'); Header('Location:http://127.0.0.1'); Die(); }}

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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