iptables/iptables-initscript

#!/bin/bash
#
# iptables -- Startup script to implement /etc/sysconfig/iptables pre-defined rules
#
# chkconfig: 2345 25 92
# description: Automates a packet filtering firewall with iptables.
# config: /etc/sysconfig/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>

. /etc/sysconfig/rc
. $rc_functions

NAME=iptables
IPTABLES=/sbin/$NAME
IPTABLES_RESTORE=/sbin/iptables-restore
IPTABLES_SAVE=/sbin/iptables-save
IPTABLES_CONFIG=/etc/sysconfig/$NAME

[ -x $IPTABLES ] || exit 0

case "$1" in
   start)
      # don't do squat if we don't have the config file
      if [ -f $IPTABLES_CONFIG ]; then
         # we do _not_ need to flush/clear anything when using 	iptables-restore
         echo -n $"Applying iptables firewall rules: "
         grep -v "^[[:space:]]*#" $IPTABLES_CONFIG | \
         grep -v '^[[:space:]]*$' | \
         $IPTABLES_RESTORE -c
         evaluate_retval; echo
      fi
      touch /var/lock/subsys/$NAME
   ;;
   stop)
      echo -n $"Setting up default policies to ACCEPT: "
      $IPTABLES --table mangle --policy PREROUTING ACCEPT &&
      $IPTABLES --table mangle --policy INPUT ACCEPT &&
      $IPTABLES --table mangle --policy FORWARD ACCEPT &&
      $IPTABLES --table mangle --policy OUTPUT ACCEPT &&
      $IPTABLES --table mangle --policy POSTROUTING ACCEPT &&
      $IPTABLES --table filter --policy INPUT ACCEPT &&
      $IPTABLES --table filter --policy OUTPUT ACCEPT &&
      $IPTABLES --table filter --policy FORWARD ACCEPT &&
      $IPTABLES --table nat --policy PREROUTING ACCEPT &&
      $IPTABLES --table nat --policy POSTROUTING ACCEPT &&
      $IPTABLES --table nat --policy OUTPUT ACCEPT
      evaluate_retval; echo

      echo -n $"Flushing all chains and deleting all user ones: "
      for table in filter nat mangle; do
         $IPTABLES --table $table --flush &&
         $IPTABLES --table $table --delete-chain &&
         $IPTABLES --table $table --zero
      done
      evaluate_retval; echo

      rm -f /var/lock/subsys/$NAME
   ;;
   restart|reload)
      # "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
      $0 start
   ;;
   condrestart)
      [ -e /var/lock/subsys/$NAME ] && $0 restart || :
   ;;
   status)
      for table in $(cat /proc/net/ip_tables_names 2>/dev/null); do
         echo "["$"TABLE:"" $table]"
         $IPTABLES -t $table --list
         echo
      done
   ;;
   panic)
      echo -n $"Setting up default policies to DROP: "
      $IPTABLES --table mangle --policy PREROUTING DROP &&
      $IPTABLES --table mangle --policy INPUT DROP &&
      $IPTABLES --table mangle --policy FORWARD DROP &&
      $IPTABLES --table mangle --policy OUTPUT DROP &&
      $IPTABLES --table mangle --policy POSTROUTING DROP &&
      $IPTABLES --table filter --policy INPUT DROP &&
      $IPTABLES --table filter --policy OUTPUT DROP &&
      $IPTABLES --table filter --policy FORWARD DROP &&
      $IPTABLES --table nat --policy PREROUTING DROP &&
      $IPTABLES --table nat --policy POSTROUTING DROP &&
      $IPTABLES --table nat --policy OUTPUT DROP
      evaluate_retval; echo

      echo -n $"Flushing all chains and deleting all user ones: "
      for table in filter nat mangle; do
         $IPTABLES --table $table --flush &&
         $IPTABLES --table $table --delete-chain &&
         $IPTABLES --table $table --zero
      done
      evaluate_retval; echo
   ;;
   save)
      echo -n $"Saving current rules to"" \`$IPTABLES_CONFIG': "
      touch $IPTABLES_CONFIG && chmod 600 $IPTABLES_CONFIG &&
      $IPTABLES_SAVE -c > $IPTABLES_CONFIG 2>/dev/null
      evaluate_retval; echo
   ;;
   *)
      echo "Usage: ""$0 {start|stop|restart|condrestart|status|panic|save}"
      exit 1
   ;;
esac

exit 0