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iptables firewall script 0.5

iptables firewall script is an Linux firewall based on the iptables software. more>>

iptables firewall script is an Linux firewall based on the iptables software.

Sample:

######## START FUNCTIONS #########
scripthelp () {
cat /dev/null 2>&1

Every 5 minutes
*/5 * * * * /path/to/this/script restart > /dev/null 2>&1

refresh
-------

Dumps current rules and reloads them.

stop
----

Dumps current rules and halts firewall.
---------------------------------------------------------

Usage: $0 [start|restart|refresh|stop]

SCRIPTHELP
}

fireme () {
if [ -z "`lsmod|grep iptable_filter`" ];
then
modprobe iptable_filter
fi

#######################################
#---------- Start predefined target rulesets ----------#
#######################################

# On the fly
$PROG -N ONTHEFLY
$PROG -A ONTHEFLY -j LOG --log-level 5 --log-prefix "TL0G_ONTHEFLY: "
$PROG -A ONTHEFLY -j DROP

# DENIED PORTS Privileged (1-1023) Target Ruleset
$PROG -N DENIED_PORT_PRIV
$PROG -A DENIED_PORT_PRIV -m state --state RELATED,ESTABLISHED -j ACCEPT
$PROG -A DENIED_PORT_PRIV -j LOG --log-level 5 --log-prefix "TL0G_DENIED_PORT_PRIV: "
$PROG -A DENIED_PORT_PRIV -j DROP

# DENIED PORTS Unprivileged TCP (1024+) Target Ruleset
$PROG -N DENIED_PORT_UNPRIV_TCP
$PROG -A DENIED_PORT_UNPRIV_TCP -m state --state RELATED,ESTABLISHED -j ACCEPT
$PROG -A DENIED_PORT_UNPRIV_TCP -j LOG --log-level 5 --log-prefix "TL0G_DENIED_PORT_T-UNPRIV: "
$PROG -A DENIED_PORT_UNPRIV_TCP -m state --state NEW,INVALID -j DROP

# DENIED PORTS Unprivileged UDP (1024+) Target Ruleset
$PROG -N DENIED_PORT_UNPRIV_UDP
$PROG -A DENIED_PORT_UNPRIV_UDP -j LOG --log-level 5 --log-prefix "TL0G_DENIED_PORT_U-UNPRIV: "
$PROG -A DENIED_PORT_UNPRIV_UDP -j DROP

#######################################
#---------- End predefined target rulesets ----------#
######################################

# Services
$PROG -A INPUT -p tcp --dport 0:112 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_PRIV
$PROG -A INPUT -p udp --dport 0:112 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_PRIV

$PROG -A INPUT -p tcp --dport 114:1023 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_PRIV
$PROG -A INPUT -p udp --dport 114:1023 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_PRIV

# NFS
$PROG -A INPUT -p tcp --dport 2049 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_UNPRIV_TCP
$PROG -A INPUT -p udp --dport 2049 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_UNPRIV_UDP

# X11
$PROG -A INPUT -p tcp --dport 6000:6005 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_UNPRIV_TCP
$PROG -A INPUT -p udp --dport 6000:6005 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_UNPRIV_UDP

# Netbus
$PROG -A INPUT -p tcp --dport 12345:12346 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_UNPRIV_TCP
$PROG -A INPUT -p udp --dport 12345:12346 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_UNPRIV_UDP

# Deny all else on TCP unless initiated from local machine/network.
# This rule covers NFS, X11, and Netbus listed above, its a catch-all for any TCP
# ports you may have services running on, but dont know what ports they use.
# Prevents an accidental crack attempt via TCP services.
# If you wish to allow any services, or alter the existing rules, they must be
# added BEFORE the rule below.

$PROG -A INPUT -p tcp --dport 1024:65535 -s 0/0 -d $IP -i $IFACE -j DENIED_PORT_UNPRIV_TCP

echo "[ [32;01mOK [0m]"
echo "rc.firewall loaded with IP: $IP and interface: $IFACE."
}

########################### END FUNCTIONS ##########################

##############################################
#----------------- START CONFIGURATION SECTION --------------------#
##############################################
# Set path to iptables program

PROG=/path/to/iptables

# Set interface type, ie; eth0, ppp0

IFACE=""

###############################################
#------------------ END CONFIGURATION SECTION ---------------------#
##############################################

# Test to make sure configuration variables are set, die if not.

if [ ! -x "$PROG" ] || [ -z "$IFACE" ];
then
echo "$PROG is not executable, or interface is not set, exiting."
exit 0
else

# Get current IP address

IP=`ifconfig $IFACE| grep inet| cut -f2 -d:| cut -f1 -d" "`

# Get old IP from last firewall load (if any).
# The purpose of getting OLDIP is so you can use this script in a cron
# job to update the firewall with the current IP, great for dialups
# and other dynamic connections.
# Examples:
# Check every 15 minutes:
# */15 * * * * /path/to/this/script restart > /dev/null 2>&1
# Check every 5 minutes:
# */5 * * * * /path/to/this/script restart > /dev/null 2>&1

OLDIP=`$PROG -n -L INPUT| grep 6005|grep udp| cut -b55-|cut -f1 -d u`

case $1 in

start)
if [ -z "$OLDIP" ];
then
echo -n "Starting firewall..."
fireme
elif [ $IP = $OLDIP ];
then
echo "FIREWALL IS UPDATED."
fi
;;
restart)
echo -n "Restarting firewall..."
if [ -z "`$PROG -n -L INPUT| grep 6005`" ];
then
fireme
elif [ $IP = $OLDIP ];
then
echo "FIREWALL IS UPDATED."
else
for i in DENIED_PORT_PRIV DENIED_PORT_UNPRIV_TCP DENIED_PORT_UNPRIV_UDP ONTHEFLY
do
$PROG -F $i
$PROG -F INPUT
$PROG -F FORWARD
$PROG -X $i
done
fireme
fi
;;
refresh)
echo -n "Resetting firewall..."
if [ -z "`$PROG -n -L INPUT| grep 6005`" ];
then
fireme
else
for i in DENIED_PORT_PRIV DENIED_PORT_UNPRIV_TCP DENIED_PORT_UNPRIV_UDP ONTHEFLY
do
$PROG -F $i
$PROG -F INPUT
$PROG -F FORWARD
$PROG -X $i
done
fireme
fi
;;
stop)
for i in DENIED_PORT_PRIV DENIED_PORT_UNPRIV_TCP DENIED_PORT_UNPRIV_UDP ONTHEFLY
do
$PROG -F $i
$PROG -F INPUT
$PROG -F FORWARD
$PROG -X $i
done
echo "Firewall stopped...[ [32;01mOK [0m]"
;;
*)
echo
scripthelp
;;
esac
fi

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