我正在尝试创建允许传入和传出 ssh 连接的 iptable 规则,然后允许到特定端口的出站连接,然后最终删除任何不匹配的内容。
这些是我提出的规则,SSH 规则有效,但是当我通过隧道进入盒子时,即使我允许它,我似乎也无法访问 http(端口 80)。任何人都可以发现错误吗?
#!/bin/bash
#clear iptables
iptables -F
iptables -X
#set default policy to drop
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP
#accept everything no matter port on localhost
iptables -A INPUT -i lo -j ACCEPT
#allow established connections
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
#allow input on port 22, (established connections auto accepted)
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
#allow traffic going to specific outbound ports
iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 6667 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 6697 -j ACCEPT
#...
#drop anything that doesnt match the rules above
iptables -A INPUT -j DROP
iptables -A OUTPUT -j DROP
谢谢你的时间。