262 lines
6.9 KiB
Plaintext
Executable File
262 lines
6.9 KiB
Plaintext
Executable File
#/bin/bash
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# v0.7
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# By Brielle Bruns <bruns@2mbit.com>
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# URL: http://www.sosdg.org/freestuff/firewall
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# License: GPLv3
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BASEDIR=/etc/firewall-sosdg
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TWEAKS=$BASEDIR/tweaks
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#BASEDIR=`pwd`
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. $BASEDIR/options
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$IPTABLES --flush &>/dev/null
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$IPTABLES -F OUTPUT &>/dev/null
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$IPTABLES -F PREROUTING &>/dev/null
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$IPTABLES -F POSTROUTING &>/dev/null
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if [ $NAT ]; then
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$IPTABLES -F -t nat &>/dev/null
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fi
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$IPTABLES -F -t raw &>/dev/null
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$BASEDIR/prerun
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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 -n "Adding trusted IP: "
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for i in $TRUSTEDIP; do
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echo -n "$i "
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$IPTABLES -A INPUT -s $i -j ACCEPT
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$IPTABLES -A OUTPUT -d $i -j ACCEPT
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done
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echo -ne "\n"
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if [ $BLOCKEDIP ]; then
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echo -n "Adding blocked IPs: "
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for i in `grep -v "\#" $BLOCKEDIP`; do
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echo -n "$i "
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$IPTABLES -A INPUT -s $i -j DROP
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$IPTABLES -A OUTPUT -d $i -j DROP
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done
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echo -ne "\n"
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fi
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if [ $CLAMPMSS ]; then
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echo "Clamping MSS to PMTU..."
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for i in $CLAMPMSS; do
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$IPTABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
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--clamp-mss-to-pmtu -o $i --mss 1400:1536
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$IPTABLES -A OUTPUT -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
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--clamp-mss-to-pmtu -o $i --mss 1400:1536
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# This is necessary to make sure that PMTU works
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$IPTABLES -A OUTPUT -p icmp --icmp-type time-exceeded \
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-o $i -j ACCEPT
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$IPTABLES -A INPUT -p icmp --icmp-type time-exceeded \
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-i $i -j ACCEPT
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$IPTABLES -A OUTPUT -p icmp --icmp-type fragmentation-needed \
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-o $i -j ACCEPT
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$IPTABLES -A INPUT -p icmp --icmp-type fragmentation-needed \
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-i $i -j ACCEPT
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done
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#$IPTABLES -t mangle -o $CLAMPMSS -A FORWARD -p tcp \
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# --tcp-flags SYN,RST SYN -m tcpmss --mss 1400:1536 \
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# -j TCPMSS --clamp-mss-to-pmtu
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#$IPTABLES -t mangle -o $CLAMPMSS -A OUTPUT -p tcp \
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# --tcp-flags SYN,RST SYN -m tcpmss --mss 1400:1536 \
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# -j TCPMSS --clamp-mss-to-pmtu
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fi
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echo -en "\n"
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$IPTABLES -A INPUT -j DROP -p udp --dport domain -m u32 --u32 \
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"0>>22&0x3C@12>>16=1&&0>>22&0x3C@20>>24=0&&0>>22&0x3C@21=0x00020001"
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if [ $CONNTRACK ]; then
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$IPTABLES -A INPUT -i lo -m state --state NEW -j ACCEPT
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$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A INPUT -m state --state INVALID -j DROP
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$IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A OUTPUT -m state --state NEW -j ACCEPT
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fi
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echo -n "Adding allowed port: "
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for i in $TCPPORTS; do
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echo -n "TCP/$i "
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$IPTABLES -A INPUT -p tcp --dport $i -j ACCEPT
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done
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for i in $UDPPORTS; do
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echo -n "UDP/$i "
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#$IPTABLES -A INPUT -p udp --dport $i -j ACCEPT
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$IPTABLES -A OUTPUT -p udp --sport 1:65535 --dport $i -j ACCEPT
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$IPTABLES -A INPUT -p udp --dport $i --sport 1:65535 -j ACCEPT
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$IPTABLES -A INPUT -p udp --sport $i --dport 1:65535 -j ACCEPT
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done
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echo -en "\n"
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echo -n "Adding allowed protocols: "
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for i in $ALLOWEDPROTO; do
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echo -n "$i "
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$IPTABLES -A INPUT -p $i -j ACCEPT
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$IPTABLES -A OUTPUT -p $i -j ACCEPT
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done
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echo -en "\n"
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if [ $CONNTRACK ]; then
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for i in $DONTTRACK; do
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$IPTABLES -t raw -I PREROUTING -s $i -j NOTRACK
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$IPTABLES -t raw -I PREROUTING -d $i -j NOTRACK
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$IPTABLES -t raw -I OUTPUT -s $i -j NOTRACK
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$IPTABLES -t raw -I OUTPUT -d $i -j NOTRACK
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done
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fi
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echo -n "Adding route: "
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if [ $ROUTING ]; then
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for i in `grep -v "\#" $ROUTING`; do
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ROUTE=( ${i//:/ } )
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FWINT1=${ROUTE[0]}
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FWINT2=${ROUTE[2]}
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FWIP1=${ROUTE[1]}
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FWIP2=${ROUTE[3]}
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echo 1 > /proc/sys/net/ipv4/conf/$FWINT1/forwarding
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echo 1 > /proc/sys/net/ipv4/conf/$FWINT2/forwarding
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$IPTABLES -A FORWARD -i $FWINT1 -o $FWINT2 \
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-s $FWIP1 -d $FWIP2 -j ACCEPT
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if [ ${ROUTE[4]} == "1" ]; then
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echo -n "$FWINT1:$FWIP1<->$FWINT2:$FWIP2 "
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$IPTABLES -A FORWARD -o $FWINT1 -i $FWINT2 \
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-d $FWIP1 -s $FWIP2 -j ACCEPT
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else
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echo -n "$FWINT1:$FWIP1->$FWINT2:$FWIP2 "
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fi
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done
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fi
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echo -ne "\n"
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if [ $PORTFW ] && [ $NAT ]; then
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for i in `grep -v "\#" $PORTFW`; do
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PORTADD=( ${i//:/ } )
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echo "Adding port forward for ext port ${PORTADD[0]}/${PORTADD[1]} to ${PORTADD[2]}:${PORTADD[3]}"
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$IPTABLES -A PREROUTING -t nat -i $NATEXTIF -p ${PORTADD[1]} \
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--dport ${PORTADD[0]} -j DNAT --to \
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${PORTADD[2]}:${PORTADD[3]}
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$IPTABLES -A INPUT -p ${PORTADD[1]} -m state --state NEW \
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--dport ${PORTADD[0]} -i $NATEXTIF -j ACCEPT
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done
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fi
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if [ $LANDHCPSERVER ]; then
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$IPTABLES -A INPUT -i $INTIF -s 0.0.0.0 -j ACCEPT
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fi
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if [ $NAT ]; then
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for i in $NATRANGE; do
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$IPTABLES -A POSTROUTING -t nat -s $i -o $NATEXTIF -j SNAT --to-source $NATEXTIP
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done
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# This is necessary to make sure that PMTU works
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$IPTABLES -A OUTPUT -p icmp --icmp-type time-exceeded -o $NATEXTIF \
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-j ACCEPT
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$IPTABLES -A OUTPUT -p icmp --icmp-type fragmentation-needed \
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-o $NATEXTIF -j ACCEPT
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fi
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$IPTABLES --policy INPUT ACCEPT
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$IPTABLES --policy OUTPUT ACCEPT
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$IPTABLES --policy FORWARD DROP
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if [ $BLOCKINCOMING ]; then
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$IPTABLES -A INPUT -p tcp --syn -j DROP
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$IPTABLES -A INPUT -p udp -j DROP
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fi
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#================[IPv6]================
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if [ $IPV6 ]; then
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$IP6TABLES --flush &>/dev/null
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$IP6TABLES -F OUTPUT &>/dev/null
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$IP6TABLES -F PREROUTING &>/dev/null
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$IP6TABLES -F POSTROUTING &>/dev/null
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echo -n "Adding trusted IPv6: "
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$IP6TABLES -A INPUT -i lo -j ACCEPT
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$IP6TABLES -A OUTPUT -o lo -j ACCEPT
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for i in $IPV6TRUSTED; do
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echo -n "$i "
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$IP6TABLES -A INPUT -s $i -j ACCEPT
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$IP6TABLES -A OUTPUT -d $i -j ACCEPT
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done
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echo -ne "\n"
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if [ $CLAMPMSSIPV6 ]; then
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echo "Clamping IPv6 MSS to PMTU..."
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ip6tables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
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--clamp-mss-to-pmtu
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ip6tables -A OUTPUT -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
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--clamp-mss-to-pmtu
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fi
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echo -n "Adding allowed IPv6 port: "
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for i in $IPV6TCP; do
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echo -n "TCP/$i "
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$IP6TABLES -A INPUT -p tcp --dport $i -j ACCEPT
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done
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for i in $IPV6UDP; do
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echo -n "UDP/$i "
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$IP6TABLES -A OUTPUT -p udp --sport 1:65535 --dport $i -j ACCEPT
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$IP6TABLES -A INPUT -p udp --dport $i --sport 1:65535 -j ACCEPT
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$IP6TABLES -A INPUT -p udp --sport $i --dport 1:65535 -j ACCEPT
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done
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echo -en "\n"
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if [ $IPV6ROUTEDCLIENTBLOCK ]; then
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$IP6TABLES -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
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$IP6TABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
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$IP6TABLES -A FORWARD -i $IPV6INT -o $IPV6LAN -p tcp --syn -j DROP
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$IP6TABLES -A INPUT -i $IPV6INT -p tcp --syn -j DROP
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$IP6TABLES -A INPUT -i $IPV6INT -p udp ! --dport 32768:65535 -j DROP
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$IP6TABLES -A FORWARD -i $IPV6INT -o $IPV6LAN -p udp ! --dport 32768:65535 -j DROP
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fi
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if [ $IPV6FORWARDRANGE ]; then
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for i in $IPV6FORWARDRANGE; do
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$IP6TABLES -A FORWARD -s $i -j ACCEPT
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$IP6TABLES -A FORWARD -d $i -j ACCEPT
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done
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fi
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if [ $IPV6BLOCKINCOMING ]; then
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$IP6TABLES -A INPUT -p tcp --syn -j DROP
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$IP6TABLES -A INPUT -p udp -j DROP
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fi
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fi
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if [ $TWEAKS ]; then
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for i in `grep -v "\#" $TWEAKS`; do
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PROCOPT=( ${i//=/ } )
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echo ${PROCOPT[1]} > /proc/sys/net/${PROCOPT[0]} &>/dev/null
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done
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fi
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$BASEDIR/postrun
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