"Paul M." <paul.marquardt@mortgagefamily.com> wrote in message
news:f2137556.0306240412.131d53b3@posting.google.com...
> Hi,
> I'm setting up a RedHat 8.0 box on the network with a static
> address. It is a relatively uncustomized box other than running some
> security updates and turning off unwanted services. I need to run
> portmap, which is why I need to filter network access. I've created a
> set of iptables rules, loaded them and saved them into
> /etc/sysconfig/iptables using iptables-save. It's a simple setup-- no
> NAT/masq, etc, just a simple port filter. I've tested it and it does
> what I want. I go home and come back in the morning and run iptables
> -L. All my rules are gone. I can reload the rules from
> /etc/sysconfig/iptables, but its hard to convince my boss that a port
> filter that deletes its own rules is a good thing. Is RedHat trying to
> "help" me ala Windows? Is there some daemon that doesn't like my rule
> set? I did not have this problem in RedHat 7.2. Thanks for any ideas.
>
> Paul M.
Put this script in your /etc/init.d directory under the name iptables (as
root)
then run
chmod u=rwx,g=rwx,o=x /etc/init.d/iptables
chkconfig --add iptables
and it will load everytime the system is booted
The only thing I have changed from the original is the addition of the -n
option to the status section
You will also find the linux firewall module of webmin makes
creating/editing/deleting/ordering rules using iptables-save and
iptables-restore VERY easy.
#!/bin/sh
#
# Startup script to implement /etc/sysconfig/iptables pre-defined rules.
#
# chkconfig: 2345 08 92
#
# description: Automates a packet filtering firewall with iptables.
#
# by bero@redhat.com, based on the ipchains script:
# Script Author: Joshua Jensen <joshua@redhat.com>
# -- hacked up by gafton with help from notting
# modified by Anton Altaparmakov <aia21@cam.ac.uk>:
# modified by Nils Philippsen <nils@redhat.de>
#
# config: /etc/sysconfig/iptables
# Source 'em up
.. /etc/init.d/functions
IPTABLES_CONFIG=/etc/sysconfig/iptables
if [ ! -x /sbin/iptables ]; then
exit 0
fi
KERNELMAJ=`uname -r | sed -e 's,\..*,,'`
KERNELMIN=`uname -r | sed -e 's,[^\.]*\.,,' -e 's,\..*,,'`
if [ "$KERNELMAJ" -lt 2 ] ; then
exit 0
fi
if [ "$KERNELMAJ" -eq 2 -a "$KERNELMIN" -lt 3 ] ; then
exit 0
fi
if /sbin/lsmod 2>/dev/null |grep -q ipchains ; then
# Don't do both
exit 0
fi
iftable() {
if fgrep -qsx $1 /proc/net/ip_tables_names; then
iptables -t "$@"
fi
}
start() {
# don't do squat if we don't have the config file
if [ -f $IPTABLES_CONFIG ]; then
# If we don't clear these first, we might be adding to
# pre-existing rules.
action $"Flushing all current rules and user defined chains:"
iptables -F
action $"Clearing all current rules and user defined chains:"
iptables -X
chains=`cat /proc/net/ip_tables_names 2>/dev/null`
for i in $chains; do iptables -t $i -F; done && \
success $"Flushing all current rules and user defined chains:"
|| \
failure $"Flushing all current rules and user defined chains:"
for i in $chains; do iptables -t $i -X; done && \
success $"Clearing all current rules and user defined chains:"
|| \
failure $"Clearing all current rules and user defined chains:"
for i in $chains; do iptables -t $i -Z; done
echo $"Applying iptables firewall rules: "
grep -v "^[[:space:]]*#" $IPTABLES_CONFIG | grep -v '^[[:space:]]*$' |
/sbin/iptables-restore -c && \
success $"Applying iptables firewall rules" || \
failure $"Applying iptables firewall rules"
echo
touch /var/lock/subsys/iptables
fi
}
stop() {
chains=`cat /proc/net/ip_tables_names 2>/dev/null`
for i in $chains; do iptables -t $i -F; done && \
success $"Flushing all chains:" || \
failure $"Flushing all chains:"
for i in $chains; do iptables -t $i -X; done && \
success $"Removing user defined chains:" || \
failure $"Removing user defined chains:"
echo -n $"Resetting built-in chains to the default ACCEPT policy:"
iftable filter -P INPUT ACCEPT && \
iftable filter -P OUTPUT ACCEPT && \
iftable filter -P FORWARD ACCEPT && \
iftable nat -P PREROUTING ACCEPT && \
iftable nat -P POSTROUTING ACCEPT && \
iftable nat -P OUTPUT ACCEPT && \
iftable mangle -P PREROUTING ACCEPT && \
iftable mangle -P OUTPUT ACCEPT && \
success $"Resetting built-in chains to the default ACCEPT policy" || \
failure $"Resetting built-in chains to the default ACCEPT policy"
echo
rm -f /var/lock/subsys/iptables
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
# "restart" is really just "start" as this isn't a daemon,
# and "start" clears any pre-defined rules anyway.
# This is really only here to make those who expect it happy
start
;;
condrestart)
[ -e /var/lock/subsys/iptables ] && start
;;
status)
tables=`cat /proc/net/ip_tables_names 2>/dev/null`
for table in $tables; do
echo $"Table: $table"
iptables -n -t $table --list
done
;;
panic)
echo -n $"Changing target policies to DROP: "
iftable filter -P INPUT DROP && \
iftable filter -P FORWARD DROP && \
iftable filter -P OUTPUT DROP && \
iftable nat -P PREROUTING DROP && \
iftable nat -P POSTROUTING DROP && \
iftable nat -P OUTPUT DROP && \
iftable mangle -P PREROUTING DROP && \
iftable mangle -P OUTPUT DROP && \
success $"Changing target policies to DROP" || \
failure $"Changing target policies to DROP"
echo
iftable filter -F INPUT && \
iftable filter -F FORWARD && \
iftable filter -F OUTPUT && \
iftable nat -F PREROUTING && \
iftable nat -F POSTROUTING && \
iftable nat -F OUTPUT && \
iftable mangle -F PREROUTING && \
iftable mangle -F OUTPUT && \
success $"Flushing all chains:" || \
failure $"Flushing all chains:"
iftable filter -X INPUT && \
iftable filter -X FORWARD && \
iftable filter -X OUTPUT && \
iftable nat -X PREROUTING && \
iftable nat -X POSTROUTING && \
iftable nat -X OUTPUT && \
iftable mangle -X PREROUTING && \
iftable mangle -X OUTPUT && \
success $"Removing user defined chains:" || \
failure $"Removing user defined chains:"
;;
save)
echo -n $"Saving current rules to $IPTABLES_CONFIG: "
touch $IPTABLES_CONFIG
chmod 600 $IPTABLES_CONFIG
/sbin/iptables-save -c > $IPTABLES_CONFIG 2>/dev/null && \
success $"Saving current rules to $IPTABLES_CONFIG" || \
failure $"Saving current rules to $IPTABLES_CONFIG"
echo
;;
*)
echo $"Usage: $0 {start|stop|restart|condrestart|status|panic|save}"
exit 1
esac
exit 0