IPtables-Persistent Script for Firewall


#!/bin/bash

. /lib/lsb/init-functions
rc=0

load_rules()
{
log_action_begin_msg “Loading iptables rules”

Load IPv4 Rules
if [ ! -f /etc/iptables/rules.v4 ]; then
log_action_cont_msg ” skipping IPv4 (no rules to load)”
else
log_action_cont_msg ” IPv4″
iptables-restore < /etc/iptables/rules.v4 2> /dev/null
if [ $? -ne 0 ]; then
rc=1
fi
fi

Load IPv6 Rules    
if [ ! -f /etc/iptables/rules.v6 ]; then
log_action_cont_msg ” skipping IPv6 (no rules to load)”
else
log_action_cont_msg ” IPv6″
ip6tables-restore < /etc/iptables/rules.v6 2> /dev/null
if [ $? -ne 0 ]; then
rc=1
fi
fi
log_action_end_msg $rc
}

save_rules()
{
log_action_begin_msg “Saving rules”

Save IPv4 Rules
/sbin/modprobe -q iptable_filter
if [ ! -f /proc/net/ip_tables_names ]; then
log_action_cont_msg ” skipping IPv4 (no modules loaded)”
elif [ -x /sbin/iptables-save ]; then
log_action_cont_msg ” IPv4″
iptables-save > /etc/iptables/rules.v4
if [ $? -ne 0 ]; then
rc=1
fi
fi

Save IPv6 Rules
/sbin/modprobe -q ip6table_filter
if [ ! -f /proc/net/ip6_tables_names ]; then
log_action_cont_msg ” skipping IPv6 (no modules loaded)”
elif [ -x /sbin/ip6tables-save ]; then
log_action_cont_msg ” IPv6″
ip6tables-save > /etc/iptables/rules.v6
if [ $? -ne 0 ]; then
rc=1
fi
fi
log_action_end_msg $rc
}

flush_rules()
{
log_action_begin_msg “Flushing rules”
if [ ! -f /proc/net/ip_tables_names ]; then
log_action_cont_msg ” skipping IPv4 (no module loaded)”
elif [ -x /sbin/iptables ]; then
log_action_cont_msg ” IPv4″
for param in F Z X; do /sbin/iptables -$param; done
for table in $(cat /proc/net/ip_tables_names)
do
/sbin/iptables -t $table -F
/sbin/iptables -t $table -Z
/sbin/iptables -t $table -X
done
for chain in INPUT FORWARD OUTPUT
do
/sbin/iptables -P $chain ACCEPT
done
fi

if [ ! -f /proc/net/ip6_tables_names ]; then
log_action_cont_msg ” skipping IPv6 (no module loaded)”
elif [ -x /sbin/ip6tables ]; then
log_action_cont_msg ” IPv6″
for param in F Z X; do /sbin/ip6tables -$param; done
for table in $(cat /proc/net/ip6_tables_names)
do
/sbin/ip6tables -t $table -F
/sbin/ip6tables -t $table -Z
/sbin/ip6tables -t $table -X
done
for chain in INPUT FORWARD OUTPUT
do
/sbin/ip6tables -P $chain ACCEPT
done
fi
log_action_end_msg 0
}

case “$1” in
start|restart|reload|force-reload)
load_rules
;;
save)
save_rules
;;
stop)
echo “Automatic flushing disabled, use \”flush\” instead of \”stop\””
;;
flush)
flush_rules
;;
*)
echo “Usage: $0 {start|restart|reload|force-reload|save|flush}” >&2
exit 1
;;
esac

exit $rc

Advertisements

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s