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HomeBackend DevelopmentPHP Tutorial防止本地用户用fsockopen DDOS攻击对策_php技巧

原因
php脚本部分源码:

复制代码 代码如下:

$fp = fsockopen("udp://$ip", $rand, $errno, $errstr, 5);
if($fp){
fwrite($fp, $out);
fclose($fp);

php脚本中的 fsockopen 函数,对外部地址,通过UDP发送大量的数据包,攻击对方。

应对
可通过 php.ini ,禁用 fsockopen 函数,及使用Windows 2003的 安全策略 屏蔽本机的UDP端口。

禁用函数
查找到 disable_functions ,添加需禁用的函数名,如下例:

passthru,exec,system,chroot,scandir,chgrp,chown,shell_exec,proc_open,proc_get_status,ini_alter,ini_alter,ini_restore,dl,pfsockopen,openlog,syslog,readlink,symlink,popepassthru,stream_socket_server,fsocket,fsockopen

重启IIS后生效。

屏蔽UDP端口
将以下着色文本复制到记事本,另存为 banudp.bat 或任意名,双击运行即可。

REM 添加安全策略,名称
netsh ipsec static add policy name=我的安全策略

REM 添加 IP筛选器列表
netsh ipsec static add filterlist name=允许列表
netsh ipsec static add filterlist name=拒绝列表

REM 添加筛选器到IP筛选器列表(允许上网)
netsh ipsec static add filter filterlist=允许列表 srcaddr=me dstaddr=any description=dns访问 protocol=udp mirrored=yes dstport=53

REM 添加筛选器到IP筛选器列表(不让别人访问)
netsh ipsec static add filter filterlist=拒绝列表 srcaddr=any dstaddr=me description=别人到我任何访问 protocol=udp mirrored=yes

REM 添加筛选器操作
netsh ipsec static add filteraction name=可以 action=permit
netsh ipsec static add filteraction name=不可以 action=block

REM 创建一个链接指定 IPSec 策略、筛选器列表和筛选器操作的规则(加入规则到我的安全策略)
netsh ipsec static add rule name=允许规则 policy=我的安全策略 filterlist=允许列表 filteraction=可以
netsh ipsec static add rule name=拒绝规则 policy=我的安全策略 filterlist=拒绝列表 filteraction=不可以

REM 激活我的安全策略
netsh ipsec static set policy name=我的安全策略 assign=y
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