55 lines
1.8 KiB
Bash
Executable File
55 lines
1.8 KiB
Bash
Executable File
#!/bin/sh
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#
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# mitchs iptables skeleton config
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# -------------------------------------------
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# -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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# variables
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# -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUBNET=192.168.100
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PIHOLE=$SUBNET.200
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# =/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=
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# flush
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iptables -F
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# deny all default
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iptables -P OUTPUT DROP
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iptables -P INPUT DROP
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iptables -P FORWARD DROP
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# dns to pihole
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iptables -A OUTPUT -j ACCEPT -d $PIHOLE/24 -p tcp --dport 53 -m state --state NEW
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iptables -A OUTPUT -j ACCEPT -d $PIHOLE/24 -p udp --dport 53 -m state --state NEW
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# permit local ssh
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iptables -A INPUT -s $SUBNET.0/24 -j ACCEPT -p tcp --dport ssh -m state --state NEW
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iptables -A INPUT -s $SUBNET.0/24 -j ACCEPT -p tcp --sport ssh -m state --state NEW
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iptables -A OUTPUT -d $SUBNET.0/24 -j ACCEPT -p tcp --sport ssh -m state --state ESTABLISHED
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iptables -A OUTPUT -d $SUBNET.0/24 -j ACCEPT -p tcp --dport ssh -m state --state ESTABLISHED
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# permit outgoing http,https,ftp as well for updates and things
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iptables -A OUTPUT -j ACCEPT -p tcp --dport 80 -m state --state NEW,ESTABLISHED
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iptables -A OUTPUT -j ACCEPT -p tcp --dport 443 -m state --state NEW,ESTABLISHED
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iptables -A OUTPUT -j ACCEPT -p tcp --dport 21 -m state --state NEW,ESTABLISHED
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# permit loopback
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iptables -A OUTPUT -j ACCEPT -o lo
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# permit established
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iptables -A INPUT -j ACCEPT -m state --state ESTABLISHED,RELATED
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# save
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if command -v systemctl >/dev/null 2>&1 ; then
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# redhat
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if [ -f /etc/sysconfig/iptables ] ; then
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iptables-save -f /etc/sysconfig/iptables
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# arch
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elif [ -f /etc/iptables/iptables.rules ] ; then
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iptables-save -f /etc/iptables/iptables.rules
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fi
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# alpine
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elif command -v rc-service >/dev/null 2>&1 ; then
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/etc/init.d/iptables save
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fi
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