112 lines
4.3 KiB
Bash
112 lines
4.3 KiB
Bash
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#!/bin/bash
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echo Flush existing rules
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iptables -F
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iptables -F -t nat
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iptables -F -t mangle
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iptables -F -t filter
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echo Delete all
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iptables -X
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if [ "$1" == "-d" ]; then
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echo Input -d open all traffic
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iptables -P INPUT ACCEPT
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iptables -P FORWARD ACCEPT
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exit 0
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else
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echo "Standard Firewall, -d to open all"
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fi
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ifx=( $(/sbin/ifconfig -s -a | tail -n +2 | cut -f1 -d' ' | grep -v lo) )
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for i in ${!ifx[@]}; do
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ipx[$i]="$(/sbin/ifconfig ${ifx[$i]} | grep -m1 -o -P '(?<=inet ).*(?= netmask)')"
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if [ "${ipx[$i]}" == "" ]; then
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ipx[$i]="----------"
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fi
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printf "%s:\t%s\n" "${ifx[$i]}" "${ipx[$i]}"
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done
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echo Set Variables
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HOST=$(hostname)
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SSHPORT=$(cat /etc/ssh/sshd_config | grep Port | grep -v "#" | cut -f2 -d' ')
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printf "Local IP: $LOCALIP\nInterface: $NETIF\n"
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echo Make Rules
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echo Allen verkehr blockieren
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iptables -P INPUT DROP
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iptables -P FORWARD DROP
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iptables -P OUTPUT ACCEPT
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for i in ${!ifx[@]}; do
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LOCALIP="${ipx[$i]}"
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NETIF="${ifx[$i]}"
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echo "Established Connections for $NETIF"
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iptables -A INPUT -i $NETIF -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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iptables -A OUTPUT -o $NETIF -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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echo "DHCP for $NETIF"
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iptables -A OUTPUT -o $NETIF -p udp --dport 67 --sport 68 -m state --state NEW,ESTABLISHED -j ACCEPT
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iptables -A INPUT -i $NETIF -p udp --sport 67 --dport 68 -m state --state RELATED,ESTABLISHED -j ACCEPT
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echo "reject connections from predator IP going over $NETIF"
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iptables -A OUTPUT ! --src $LOCALIP -o $NETIF -j REJECT
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if [ "${HOST}" == "serverhost" ]; then
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echo Incoming https
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iptables -A INPUT -i $NETIF -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
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iptables -A OUTPUT -o $NETIF -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT
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fi
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echo "Incoming SSH P3032 for $NETIF"
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iptables -A INPUT -i $NETIF -p tcp -m state --state NEW -m tcp --dport $SSHPORT -j ACCEPT
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iptables -A OUTPUT -o $NETIF -p tcp --sport $SSHPORT -m state --state ESTABLISHED -j ACCEPT
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echo "Ping Reply for $NETIF"
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iptables -A INPUT -i $NETIF -p icmp --icmp-type echo-request -j ACCEPT
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iptables -A OUTPUT -o $NETIF -p icmp --icmp-type echo-reply -j ACCEPT
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done
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echo loopback
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iptables -A INPUT -i lo -j ACCEPT
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iptables -A OUTPUT -o lo -j ACCEPT
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echo Logging
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iptables -N LOGGING
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iptables -A INPUT -j LOGGING
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iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables Packet Dropped: " --log-level 7
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iptables -A LOGGING -j DROP
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#echo Outgoing https
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#iptables -A OUTPUT -o $NETIF -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
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#iptables -A INPUT -i $NETIF -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT
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#echo torrents
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#iptables -A OUTPUT -o $NETIF -p udp -m state --state NEW,ESTABLISHED -j ACCEPT
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#iptables -A INPUT -i $NETIF -p tcp --sport 6890:6999 -m state --state NEW,ESTABLISHED -j ACCEPT
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#iptables -A INPUT -i $NETIF -p udp --sport 6890:6999 -m state --state NEW,ESTABLISHED -j ACCEPT
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#echo Outgoing SSH p1160
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#iptables -A INPUT -i $NETIF -p tcp --sport 1160 -m state --state ESTABLISHED -j ACCEPT
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#iptables -A OUTPUT -o $NETIF -p tcp --dport 1160 -m state --state NEW,ESTABLISHED -j ACCEPT
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#echo Ping Request
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#iptables -A OUTPUT -o $NETIF -p icmp --icmp-type echo-request -j ACCEPT
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#iptables -A INPUT -i $NETIF -p icmp --icmp-type echo-reply -j ACCEPT
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#echo Incoming SSH p22
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#iptables -A INPUT -i $NETIF -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
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#iptables -A OUTPUT -o $NETIF -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT
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#echo Outgoing SSH p22
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#iptables -A INPUT -i $NETIF -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT
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#iptables -A OUTPUT -o $NETIF -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
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#echo outgouing http
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#iptables -A OUTPUT -o $NETIF -p tcp --dport 80 -m state --state NEW -j ACCEPT
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#iptables -A INPUT -i $NETIF -p tcp --sport 80 -m state --state RELATED,ESTABLISHED -j ACCEPT
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#echo incoming http
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#iptables -A INPUT -i $NETIF -p tcp --dport 80 -m state --state RELATED,ESTABLISHED -j DROP
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#iptables -A OUTPUT -o $NETIF -p tcp --sport 80 -m state --state NEW -j DROP
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#echo DNS
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#iptables -A OUTPUT -o $NETIF -p tcp --dport 53 -m state --state NEW -j ACCEPT
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#iptables -A OUTPUT -o $NETIF -p udp --dport 53 -m state --state NEW -j ACCEPT
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#iptables -A INPUT -i $NETIF -p tcp --sport 53 -m state --state NEW -j ACCEPT
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#iptables -A INPUT -i $NETIF -p udp --sport 53 -m state --state NEW -j ACCEPT
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