用iptables屏蔽一些端口,来保护你的公用shadowsocks代理

2015/10/17
若作为一个公共的代理,必须对服务有所限制,不然就成了公交车了。linux下可以对端口进行限制来保护自己变成发垃圾邮件等其他运营商讨厌的替罪羊。
只留SSH,SQL,DNS,HTTP,HTTPS端口
环回网络
iptables -A OUTPUT -o lo -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
DNS
iptables -A OUTPUT -p udp –sport 53 -j ACCEPT
iptables -A INPUT -p udp –dport 53 -j ACCEPT
网页-SQL
iptables -A OUTPUT -p tcp -m multiport –dport 80,443,3306 -j ACCEPT
iptables -A INPUT -p tcp -m multiport –sport 80,443,3306 -j ACCEPT
代理-SSH
iptables -A OUTPUT -p tcp -m multiport –sport 1080,22 -j ACCEPT
iptables -A INPUT -p tcp -m multiport –dport 1080,22 -j ACCEPT
用户
iptables -A OUTPUT -p tcp –sport50000:60000 -j ACCEPT
iptables -A OUTPUT -p udp –sport50000:60000 -j ACCEPT
iptables -A INPUT -p tcp –dport50000:60000 -j ACCEPT
iptables -A INPUT -p udp –dport50000:60000 -j ACCEPT
连接数
iptables -A OUTPUT -p tcp –sport50000:60000 -m connlimit –connlimit-above 20 -j REJECT –reject-with tcp-reset
iptables -A INPUT -p tcp –dport50000:60000 -m connlimit –connlimit-above 20 -j REJECT –reject-with tcp-reset
其他
iptables -A OUTPUT -p icmp -j ACCEPT
iptables -A INPUT -p icmp -j ACCEPT
禁止
iptables -P OUTPUT DROP
iptables -P INPUT DROP
iptables -P FORWARD DROP
请把你的SSH22端口改了
=====================================
屏蔽其他端口
iptables -A OUTPUT -p tcp -m multiport –dport 21,22,23 -j REJECT –reject-with tcp-reset
iptables -A OUTPUT -p udp -m multiport –dport 21,22,23 -j DROP
=======================================
屏蔽邮箱端口
iptables -A OUTPUT -p tcp -m multiport –dport 24,25,50,57,105,106,109,110,143,158,209,218,220,465,587 -j REJECT –reject-with tcp-reset
iptables -A OUTPUT -p tcp -m multiport –dport 993,995,1109,24554,60177,60179 -j REJECT –reject-with tcp-reset
iptables -A OUTPUT -p udp -m multiport –dport 24,25,50,57,105,106,109,110,143,158,209,218,220,465,587 -j DROP
iptables -A OUTPUT -p udp -m multiport –dport 993,995,1109,24554,60177,60179 -j DROP
======================================

至于限制用户的带宽,用TC控制!
还有个防止被用来CC和敏感词的,可以安装nginx添加个其他端口的规则,用iptables nat把80端口转发到你所设置端口处理内容,然后安装云锁(对nginx检测),就有所提防了

来源:http://briteming.blogspot.com/2015/10/iptablesshadowsocksshadowsocks.html

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