Firewall-SOSDG/rc.firewall

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