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#/bin/sh
# v0.9.4
# By Brielle Bruns <bruns@2mbit.com>
# URL: http://www.sosdg.org/freestuff/firewall
# License: GPLv3
#
# Copyright (C) 2009 - 2010 Brielle Bruns
# Copyright (C) 2009 - 2010 The Summit Open Source Development Group
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
FW_VERSION="0.9.4 BETA"
BASEDIR=/etc/firewall-sosdg
#BASEDIR=`pwd`
TWEAKS=$BASEDIR/tweaks
. $BASEDIR/include/static
. $BASEDIR/options
. $BASEDIR/include/functions
while [ $# -gt 0 ]; do
case "$1" in
-f|--flush)
iptables_policy_reset ipv4 ACCEPT
iptables_policy_reset ipv6 ACCEPT
iptables_rules_flush ipv4
iptables_rules_flush ipv6
exit 0
;;
-h|--help)
show_help
exit 0
;;
esac
shift
done
echo "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Firewall/SOSDG ${FW_VERSION}
Brielle Bruns <bruns@2mbit.com>
http://www.sosdg.org/freestuff/firewall
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to
redistribute it under certain conditions.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-="
iptables_rules_flush ipv4
if [ -s "$BASEDIR/include/ipv4_custom_flush" ]; then
display_c YELLOW "Loading custom flush rules..."
. "$BASEDIR/include/ipv4_custom_flush"
fi
$BASEDIR/prerun
$IPTABLES -A INPUT -i lo -j ACCEPT
$IPTABLES -A OUTPUT -o lo -j ACCEPT
if [ -s "$BASEDIR/include/ipv4_custom_trust" ]; then
display_c YELLOW "Loading custom trust rules..."
. "$BASEDIR/include/ipv4_custom_trust"
fi
if [ "$TRUSTEDIP" ]; then
display_c YELLOW "Adding trusted IP: " N
for i in $TRUSTEDIP; do
echo -n "$i "
$IPTABLES -A INPUT -s $i -j ACCEPT
$IPTABLES -A OUTPUT -d $i -j ACCEPT
done
echo -ne "\n"
fi
if [ -s "$BASEDIR/include/ipv4_custom_blockip" ]; then
display_c YELLOW "Loading custom ip block rules..."
. "$BASEDIR/include/ipv6_custom_blockip"
fi
if [ $BLOCKEDIP ]; then
display_c YELLOW "Adding blocked IPs: " N
for i in `grep -v "\#" $BLOCKEDIP`; do
echo -n "$i "
$IPTABLES -A INPUT -s $i -j DROP
$IPTABLES -A OUTPUT -d $i -j DROP
done
echo -ne "\n"
fi
if [ "$STRIPECN" ]; then
display_c YELLOW "Stripping ECN off of TCP packets to " N
for i in $STRIPECN; do
echo -en "$i "
$IPTABLES -A PREROUTING -t mangle -p tcp -d $i -j ECN \
--ecn-tcp-remove
done
echo -ne "\n"
fi
if [ -s "$BASEDIR/include/ipv4_custom_mssclamp" ]; then
display_c YELLOW "Loading custom MSS Clamp rules..."
. "$BASEDIR/include/ipv4_custom_mssclamp"
fi
if [ "$CLAMPMSS" ]; then
display_c YELLOW "Clamping MSS to PMTU..."
for i in $CLAMPMSS; do
$IPTABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
--clamp-mss-to-pmtu -o $i -m tcpmss --mss 1400:1536
$IPTABLES -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
$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
echo -en "\n"
fi
$IPTABLES -A INPUT -j DROP -p udp --dport domain -m u32 --u32 \
"0>>22&0x3C@12>>16=1&&0>>22&0x3C@20>>24=0&&0>>22&0x3C@21=0x00020001"
if [ -s "$BASEDIR/include/ipv4_custom_conntrack" ]; then
display_c YELLOW "Loading custom conntrack rules..."
. "$BASEDIR/include/ipv4_custom_conntrack"
fi
if [ $CONNTRACK ]; then
$IPTABLES -A INPUT -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 FORWARD -m state --state NEW -j ACCEPT
$IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
$IPTABLES -A OUTPUT -m state --state NEW -j ACCEPT
$IPTABLES -A INPUT -m state --state INVALID -j DROP
$IPTABLES -A OUTPUT -m state --state INVALID -j DROP
$IPTABLES -A FORWARD -m state --state INVALID -j DROP
fi
if [ -s "$BASEDIR/include/ipv4_custom_blockoutports" ]; then
display_c YELLOW "Loading custom blocked outbound port rules..."
. "$BASEDIR/include/ipv4_custom_blockoutports"
fi
if [ "$BLOCKTCPPORTS" ] || [ "$BLOCKUDPPORTS" ]; then
display_c YELLOW "Blocking outbound port: " N
if [ "$BLOCKTCPPORTS" ]; then
for i in $BLOCKTCPPORTS; do
echo -en "${PURPLE}TCP${DEFAULT_COLOR}/${GREEN}$i "
$IPTABLES -A OUTPUT -p tcp --dport $i --syn -j DROP
if [ "$NATRANGE" ]; then
for src in $NATRANGE; do
$IPTABLES -A FORWARD -p tcp -s $src --dport $i --syn -j DROP
done
fi
done
fi
if [ "$BLOCKUDPPORTS" ]; then
for i in $BLOCKUDPPORTS; do
echo -en "${BLUE}UDP${DEFAULT_COLOR}/${GREEN}$i "
$IPTABLES -A OUTPUT -p udp --dport $i -j DROP
if [ "$NATRANGE" ]; then
for src in $NATRANGE; do
$IPTABLES -A FORWARD -p udp -s $src --dport $i -j DROP
done
fi
done
fi
reset_color
fi
if [ -s "$BASEDIR/include/ipv4_custom_allowedports" ]; then
display_c YELLOW "Loading custom allowed port rules..."
. "$BASEDIR/include/ipv4_custom_allowedports"
fi
if [ "$TCPPORTS" ] || [ "$UDPPORTS" ]; then
display_c YELLOW "Adding allowed port: " N
if [ "$TCPPORTS" ]; then
for i in $TCPPORTS; do
echo -en "${PURPLE}TCP${DEFAULT_COLOR}/${GREEN}$i "
$IPTABLES -A INPUT -p tcp --dport $i -j ACCEPT
done
fi
if [ "$UDPPORTS" ]; then
for i in $UDPPORTS; do
echo -en "${BLUE}UDP${DEFAULT_COLOR}/${GREEN}$i "
#$IPTABLES -A INPUT -p udp --dport $i -j ACCEPT
$IPTABLES -A OUTPUT -p udp --sport 1:65535 --dport $i -j ACCEPT
$IPTABLES -A INPUT -p udp --dport $i --sport 1:65535 -j ACCEPT
$IPTABLES -A INPUT -p udp --sport $i --dport 1:65535 -j ACCEPT
done
fi
reset_color
fi
if [ -s "$BASEDIR/include/ipv4_custom_proto" ]; then
display_c YELLOW "Loading custom protocol rules..."
. "$BASEDIR/include/ipv4_custom_proto"
fi
if [ "$ALLOWEDPROTO" ]; then
display_c YELLOW "Adding allowed protocols: " N
for i in $ALLOWEDPROTO; do
echo -n "$i "
$IPTABLES -A INPUT -p $i -j ACCEPT
$IPTABLES -A OUTPUT -p $i -j ACCEPT
done
reset_color
fi
if [ -s "$BASEDIR/include/ipv4_custom_notrack" ]; then
display_c YELLOW "Loading custom NOTRACK rules..."
. "$BASEDIR/include/ipv4_custom_notrack"
fi
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 $i -j NOTRACK
done
fi
if [ -s "$BASEDIR/include/ipv4_custom_routing" ]; then
display_c YELLOW "Loading custom routing rules..."
. "$BASEDIR/include/ipv4_custom_routing"
fi
if [ $ROUTING ]; then
display_c YELLOW "Adding route: " N
for i in `grep -v "\#" $ROUTING`; do
ROUTE=( ${i//:/ } )
FWINT1=${ROUTE[0]}
FWINT2=${ROUTE[2]}
FWIP1=${ROUTE[1]}
FWIP2=${ROUTE[3]}
if [ -e "/proc/sys/net/ipv4/conf/$FWINT1/forwarding" ]; then
echo 1 > /proc/sys/net/ipv4/conf/$FWINT1/forwarding
fi
if [ -e "/proc/sys/net/ipv4/conf/$FWINT2/forwarding" ]; then
echo 1 > /proc/sys/net/ipv4/conf/$FWINT2/forwarding
fi
$IPTABLES -A FORWARD -i $FWINT1 -o $FWINT2 \
-s $FWIP1 -d $FWIP2 -j ACCEPT
if [ ${ROUTE[4]} == "1" ]; then
#echo -en "\E[35m$FWINT1\E[37m:$FWIP1<->\E[34m$FWINT2\E[37m:$FWIP2 "
echo -en "${PURPLE}$FWINT1:$FWIP1${AQUA}<->${BLUE}$FWINT2:$FWIP2 "
$IPTABLES -A FORWARD -o $FWINT1 -i $FWINT2 \
-d $FWIP1 -s $FWIP2 -j ACCEPT
else
echo -en "${PURPLE}$FWINT1:$FWIP1${AQUA}->${BLUE}$FWINT2:$FWIP2 "
fi
done
echo -ne "\n"
fi
if [ -s "$BASEDIR/include/ipv4_custom_portforward" ]; then
display_c YELLOW "Loading custom port forwarding rules..."
. "$BASEDIR/include/ipv4_custom_portforward"
fi
if [ $PORTFW ] && [ $NAT ]; then
display_c YELLOW "Adding port forward for: " N
for i in `grep -v "\#" $PORTFW`; do
PORTADD=( ${i//:/ } )
$IPTABLES -A PREROUTING -t nat -i ${PORTADD[0]} -p ${PORTADD[2]} \
--dport ${PORTADD[1]} -j DNAT --to \
${PORTADD[3]}:${PORTADD[4]}
$IPTABLES -A INPUT -p ${PORTADD[2]} -m state --state NEW \
--dport ${PORTADD[1]} -i ${PORTADD[0]} -j ACCEPT
echo -en "${GREEN}${PORTADD[0]}:${PURPLE}${PORTADD[1]}:${PORTADD[2]}${AQUA}->${BLUE}${PORTADD[3]}:${PORTADD[4]} "
done
reset_color
fi
if [ $LANDHCPSERVER ]; then
#$IPTABLES -A INPUT -i $INTIF -s 0.0.0.0 -j ACCEPT
$IPTABLES -I INPUT -i $INTIF -p udp --dport 67:68 --sport \
67:68 -j ACCEPT
fi
if [ -s "$BASEDIR/include/ipv4_custom_nat" ]; then
display_c YELLOW "Loading custom nat rules..."
. "$BASEDIR/include/ipv4_custom_nat"
fi
if [ $NAT ]; then
if [ "$NAT_RANGE" ]; then
display_c YELLOW "Adding NAT rule: " N
for i in $NAT_RANGE; do
NAT_RULE=( ${i//:/ } )
case ${NAT_RULE[0]} in
SNAT)
$IPTABLES -A POSTROUTING -t nat -s ${NAT_RULE[2]} -j SNAT \
-o ${NAT_RULE[3]} --to-source ${NAT_RULE[4]}
echo -en "${GREEN}SNAT:${PURPLE}${NAT_RULE[1]}:${NAT_RULE[2]}${AQUA}->${BLUE}${NAT_RULE[3]}:${NAT_RULE[4]} "
$IPTABLES -A OUTPUT -p icmp --icmp-type time-exceeded -o ${NAT_RULE[3]} -j ACCEPT
$IPTABLES -A OUTPUT -p icmp --icmp-type fragmentation-needed -o ${NAT_RULE[3]} -j ACCEPT
;;
MASQ)
$IPTABLES -A POSTROUTING -t nat -s ${NAT_RULE[2]} -j MASQUERADE -o ${NAT_RULE[3]}
echo -en "${GREEN}MASQ:${PURPLE}${NAT_RULE[2]}${AQUA}->${BLUE}${NAT_RULE[3]} "
$IPTABLES -A OUTPUT -p icmp --icmp-type time-exceeded -o ${NAT_RULE[3]} -j ACCEPT
$IPTABLES -A OUTPUT -p icmp --icmp-type fragmentation-needed -o ${NAT_RULE[3]} -j ACCEPT
;;
*) display_c RED "Invalid NAT rule in NAT_RANGE" ;;
esac
done
reset_color
fi
#=================
# This section is going away in 1.0
if [ "$NATRANGE" ]; then
echo -e "${RED} **** WARNING ****"
echo -e "${RED} NATRANGE option detected. Please switch to using"
echo -e "${RED} NAT_RANGE which uses the newer style NAT mappings."
echo -e "${RED} NATRANGE will be removed in v1.0"
for i in $NATRANGE; do
$IPTABLES -A POSTROUTING -t nat -s $i -o $NATEXTIF -j SNAT --to-source $NATEXTIP
done
#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
#=================
fi
fi
$IPTABLES --policy INPUT ACCEPT
$IPTABLES --policy OUTPUT ACCEPT
$IPTABLES --policy FORWARD DROP
if [ -s "$BASEDIR/include/ipv4_custom_blockincoming" ]; then
display_c YELLOW "Loading custom incoming blocked rules..."
. "$BASEDIR/include/ipv4_custom_blockincoming"
fi
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
$IP6TABLES -F POSTROUTING &>/dev/null
if [ -s "$BASEDIR/include/ipv6_custom_flush" ]; then
display_c YELLOW "Loading custom IPv6 flush rules..."
. "$BASEDIR/include/ipv6_custom_flush"
fi
display_c YELLOW "Adding trusted IPv6: " N
$IP6TABLES -A INPUT -i lo -j ACCEPT
$IP6TABLES -A OUTPUT -o lo -j ACCEPT
if [ -s "$BASEDIR/include/ipv6_custom_trust" ]; then
display_c YELLOW "Loading custom IPv6 trust rules..."
. "$BASEDIR/include/ipv6_custom_trust"
fi
for i in $IPV6TRUSTED; do
echo -n "$i "
$IP6TABLES -A INPUT -s $i -j ACCEPT
$IP6TABLES -A OUTPUT -d $i -j ACCEPT
done
reset_color
if [ -s "$BASEDIR/include/ipv6_custom_mssclamp" ]; then
display_c YELLOW "Loading custom IPv6 MSS Clamp rules..."
. "$BASEDIR/include/ipv6_custom_mssclamp"
fi
if [ "$CLAMPMSSIPV6" ]; then
display_c YELLOW "Clamping IPV6 MSS to PMTU..."
for i in $CLAMPMSSIPV6; do
$IP6TABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
-j TCPMSS --clamp-mss-to-pmtu -o $i -m tcpmss \
--mss 1280:1536
$IP6TABLES -A OUTPUT -p tcp --tcp-flags SYN,RST SYN \
-j TCPMSS --clamp-mss-to-pmtu -o $i -m tcpmss \
--mss 1280:1536
# This is necessary to make sure that PMTU works
$IP6TABLES -A OUTPUT -p icmpv6 --icmpv6-type time-exceeded \
-o $i -j ACCEPT
$IP6TABLES -A INPUT -p icmpv6 --icmpv6-type time-exceeded \
-i $i -j ACCEPT
$IP6TABLES -A OUTPUT -p icmpv6 --icmpv6-type packet-too-big \
-o $i -j ACCEPT
$IP6TABLES -A INPUT -p icmpv6 --icmpv6-type packet-too-big \
-i $i -j ACCEPT
done
fi
if [ -s "$BASEDIR/include/ipv6_custom_blockoutports" ]; then
display_c YELLOW "Loading custom IPv6 blocked outbound port rules..."
. "$BASEDIR/include/ipv6_custom_blockoutports"
fi
if [ "$BLOCKIPV6TCPPORTS" ] || [ "$BLOCKIPV6UDPPORTS" ]; then
display_c YELLOW "Blocking outbound port: " N
if [ "$BLOCKIPV6TCPPORTS" ]; then
for i in $BLOCKIPV6TCPPORTS; do
echo -en "${PURPLE}TCP${DEFAULT_COLOR}/${GREEN}$i "
$IP6TABLES -A OUTPUT -p tcp --dport $i --syn -j DROP
done
fi
if [ "$BLOCKIPV6UDPPORTS" ]; then
for i in $BLOCKIPV6UDPPORTS; do
echo -en "${BLUE}UDP${DEFAULT_COLOR}/${GREEN}$i "
$IP6TABLES -A OUTPUT -p udp --dport $i -j DROP
done
fi
reset_color
fi
if [ -s "$BASEDIR/include/ipv6_custom_allowedports" ]; then
display_c YELLOW "Loading custom IPv6 allowed port rules..."
. "$BASEDIR/include/ipv6_custom_allowedports"
fi
if [ "$IPV6TCP" ] || [ "$IPV6UDP" ]; then
display_c YELLOW "Adding allowed IPv6 port: " N
if [ "$IPV6TCP" ]; then
for i in $IPV6TCP; do
echo -en "${PURPLE}TCP${DEFAULT_COLOR}/${GREEN}$i "
$IP6TABLES -A INPUT -p tcp --dport $i -j ACCEPT
done
fi
if [ "$IPV6UDP" ]; then
for i in $IPV6UDP; do
echo -en "${BLUE}UDP${DEFAULT_COLOR}/${GREEN}$i "
$IP6TABLES -A OUTPUT -p udp --sport 1:65535 --dport $i -j ACCEPT
$IP6TABLES -A INPUT -p udp --dport $i --sport 1:65535 -j ACCEPT
$IP6TABLES -A INPUT -p udp --sport $i --dport 1:65535 -j ACCEPT
done
fi
reset_color
fi
fi
if [ -s "$BASEDIR/include/ipv6_custom_conntrack" ]; then
display_c YELLOW "Loading custom IPv6 conntrack rules..."
. "$BASEDIR/include/ipv6_custom_conntrack"
fi
if [ $IPV6ROUTEDCLIENTBLOCK ]; then
$IP6TABLES -A INPUT -m state --state NEW -j ACCEPT
$IP6TABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
$IP6TABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
$IP6TABLES -A FORWARD -m state --state NEW -j ACCEPT
$IP6TABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
$IP6TABLES -A OUTPUT -m state --state NEW -j ACCEPT
$IP6TABLES -A INPUT -m state --state INVALID -j DROP
$IP6TABLES -A OUTPUT -m state --state INVALID -j DROP
$IP6TABLES -A FORWARD -m state --state INVALID -j DROP
$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 $IPV6LAN -p udp ! --dport 32768:65535 -j DROP
fi
if [ -s "$BASEDIR/include/ipv6_custom_routing" ]; then
display_c YELLOW "Loading custom IPv6 routing rules..."
. "$BASEDIR/include/ipv6_custom_routing"
fi
if [ "$IPV6FORWARDRANGE" ]; then
for i in $IPV6FORWARDRANGE; do
$IP6TABLES -A FORWARD -s $i -j ACCEPT
$IP6TABLES -A FORWARD -d $i -j ACCEPT
done
fi
if [ -s "$BASEDIR/include/ipv6_custom_blockincoming" ]; then
display_c YELLOW "Loading custom IPv6 incoming blocked port rules..."
. "$BASEDIR/include/ipv6_custom_blockincoming"
fi
if [ $IPV6BLOCKINCOMING ]; then
$IP6TABLES -A INPUT -p tcp --syn -j DROP
$IP6TABLES -A INPUT -p udp -j DROP
fi
if [ $TWEAKS ]; then
for i in `grep -v "\#" $TWEAKS`; do
PROCOPT=( ${i//=/ } )
echo ${PROCOPT[1]} > /proc/sys/net/${PROCOPT[0]} &>/dev/null
done
fi
$BASEDIR/postrun
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