Merge pull request #72 from ss-o/patch1.2
Nick Sweeting
3 years ago
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GitHub
commit
49cd431df4
@ -0,0 +1,80 @@
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#!/bin/bash
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IPT="/sbin/iptables"
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# Server IP
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SERVER_IP="$(ip addr show eth0 | grep 'inet ' | cut -f2 | awk '{ print $2}')"
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# Your DNS servers you use: cat /etc/resolv.conf
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DNS_SERVER="8.8.4.4 8.8.8.8"
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# Allow connections to this package servers
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PACKAGE_SERVER="ftp.us.debian.org security.debian.org"
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echo "flush iptable rules"
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$IPT -F
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$IPT -X
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$IPT -t nat -F
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$IPT -t nat -X
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$IPT -t mangle -F
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$IPT -t mangle -X
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echo "Set default policy to 'DROP'"
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$IPT -P INPUT DROP
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$IPT -P FORWARD DROP
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$IPT -P OUTPUT DROP
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## This should be one of the first rules.
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## so dns lookups are already allowed for your other rules
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for ip in $DNS_SERVER; do
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echo "Allowing DNS lookups (tcp, udp port 53) to server '$ip'"
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$IPT -A OUTPUT -p udp -d $ip --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPT -A INPUT -p udp -s $ip --sport 53 -m state --state ESTABLISHED -j ACCEPT
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$IPT -A OUTPUT -p tcp -d $ip --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPT -A INPUT -p tcp -s $ip --sport 53 -m state --state ESTABLISHED -j ACCEPT
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done
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echo "allow all and everything on localhost"
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$IPT -A INPUT -i lo -j ACCEPT
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$IPT -A OUTPUT -o lo -j ACCEPT
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for ip in $PACKAGE_SERVER; do
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echo "Allow connection to '$ip' on port 21"
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$IPT -A OUTPUT -p tcp -d "$ip" --dport 21 -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPT -A INPUT -p tcp -s "$ip" --sport 21 -m state --state ESTABLISHED -j ACCEPT
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echo "Allow connection to '$ip' on port 80"
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$IPT -A OUTPUT -p tcp -d "$ip" --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPT -A INPUT -p tcp -s "$ip" --sport 80 -m state --state ESTABLISHED -j ACCEPT
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echo "Allow connection to '$ip' on port 443"
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$IPT -A OUTPUT -p tcp -d "$ip" --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPT -A INPUT -p tcp -s "$ip" --sport 443 -m state --state ESTABLISHED -j ACCEPT
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done
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#######################################################################################################
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## Global iptable rules. Not IP specific
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echo "Allowing new and established incoming connections to port 21, 80, 443"
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$IPT -A INPUT -p tcp -m multiport --dports 21,80,443 -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPT -A OUTPUT -p tcp -m multiport --sports 21,80,443 -m state --state ESTABLISHED -j ACCEPT
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echo "Allow all outgoing connections to port 22"
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$IPT -A OUTPUT -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPT -A INPUT -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT
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echo "Allow outgoing icmp connections (pings,...)"
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$IPT -A OUTPUT -p icmp -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
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$IPT -A INPUT -p icmp -m state --state ESTABLISHED,RELATED -j ACCEPT
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echo "Allow outgoing connections to port 123 (ntp syncs)"
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$IPT -A OUTPUT -p udp --dport 123 -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPT -A INPUT -p udp --sport 123 -m state --state ESTABLISHED -j ACCEPT
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# Log before dropping
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$IPT -A INPUT -j LOG -m limit --limit 12/min --log-level 4 --log-prefix 'IP INPUT drop: '
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$IPT -A INPUT -j DROP
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$IPT -A OUTPUT -j LOG -m limit --limit 12/min --log-level 4 --log-prefix 'IP OUTPUT drop: '
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$IPT -A OUTPUT -j DROP
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exit 0
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