IPT="/usr/sbin/iptables"
MOD="/sbin/modprobe"
status="0"
startFirewall() {
echo
echo "Starting firewall..."
echo -n "Loading needed modules...          "
$MOD ip_tables 
$MOD ip_conntrack 
$MOD ipt_LOG 
$MOD ipt_limit 
$MOD ipt_state 
$MOD ip_conntrack_ftp
$MOD ip_conntrack_irc
$MOD iptable_filter
echo "Done."
#  Define all custom chains
echo -n "Create custom chains...                "
  echo "Done."
#  Rules:
echo "Settup Rules in Table FILTER:
"
#  Define Rules for Chain: INPUT
echo -n "Create Rules for Chain: INPUT                    "
$IPT -t filter -A INPUT --protocol tcp  --destination-port 80 -j ACCEPT  || { status="1"; echo "Setting up Rule: WWW_SERVER FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol tcp  --destination-port 8080 -j ACCEPT  || { status="1"; echo "Setting up Rule: WWW-PROXY_SERVER FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol tcp  --destination-port 443 -j ACCEPT  || { status="1"; echo "Setting up Rule: SEC_WWW_SERVER FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol tcp  --destination-port 110 -j ACCEPT  || { status="1"; echo "Setting up Rule: POP3_SERVER FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol tcp  --destination-port 25 -j ACCEPT  || { status="1"; echo "Setting up Rule: SMTP_SERVER FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol tcp  --destination-port 143 -j ACCEPT  || { status="1"; echo "Setting up Rule: IMAP_SERVER FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol tcp  --destination-port 585 -j ACCEPT  || { status="1"; echo "Setting up Rule: SEC_IMAP_SERVER FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol tcp  --destination-port 21 -j ACCEPT  || { status="1"; echo "Setting up Rule: FTP_SERVER FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol tcp  --destination-port 6667 -j ACCEPT  || { status="1"; echo "Setting up Rule: Custom_irc_TCP FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --protocol icmp   --icmp-type echo-request --match limit --limit 5/minute -j ACCEPT  || { status="1"; echo "Setting up Rule: PING_INPUT FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --match state --state RELATED,ESTABLISHED -j ACCEPT  || { status="1"; echo "Setting up Rule: CONNRACK_INPUT FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT --destination 127.0.0.1 --in-interface lo -j ACCEPT  || { status="1"; echo "Setting up Rule: LOOPBACK_INPUT FAILED !!!"; exit 1; }
$IPT -t filter -A INPUT -m limit --limit 1/second --limit-burst 5 -j LOG --log-prefix "KMF: " || { status="1"; echo "Setting up Rule: Chain: INPUT Drop Logging FAILED !!!"; exit 1; }
$IPT -t filter -P INPUT DROP || { status="1"; echo "Setting up Rule: Chain: INPUT Default Target FAILED !!!"; exit 1; }
echo "Done."
#  Define Rules for Chain: OUTPUT
echo -n "Create Rules for Chain: OUTPUT                    "
$IPT -t filter -A OUTPUT --protocol icmp  -j ACCEPT  || { status="1"; echo "Setting up Rule: PING_OUTPUT FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --source 127.0.0.1 --out-interface lo -j ACCEPT  || { status="1"; echo "Setting up Rule: LOOPBACK_OUTPUT FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol udp  --destination-port 389 -j ACCEPT  || { status="1"; echo "Setting up Rule: LDAP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol udp  --destination-port 636 -j ACCEPT  || { status="1"; echo "Setting up Rule: SEC_LDAP_UDP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 636 -j ACCEPT  || { status="1"; echo "Setting up Rule: SEC_LDAP_TCP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol udp  --destination-port 53 -j ACCEPT  || { status="1"; echo "Setting up Rule: DNS_UDP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 53 -j ACCEPT  || { status="1"; echo "Setting up Rule: DNS_TCP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 80 -j ACCEPT  || { status="1"; echo "Setting up Rule: WWW FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 8080 -j ACCEPT  || { status="1"; echo "Setting up Rule: WWW-PROXY FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 443 -j ACCEPT  || { status="1"; echo "Setting up Rule: SEC_WWW FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 25 -j ACCEPT  || { status="1"; echo "Setting up Rule: SMTP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 110 -j ACCEPT  || { status="1"; echo "Setting up Rule: POP3 FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 995 -j ACCEPT  || { status="1"; echo "Setting up Rule: SEC_POP3 FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 143 -j ACCEPT  || { status="1"; echo "Setting up Rule: IMAP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 585 -j ACCEPT  || { status="1"; echo "Setting up Rule: SEC_IMAP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 21 -j ACCEPT  || { status="1"; echo "Setting up Rule: FTP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 23 -j ACCEPT  || { status="1"; echo "Setting up Rule: TELNET FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 22 -j ACCEPT  || { status="1"; echo "Setting up Rule: SSH FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --protocol tcp  --destination-port 6667 -j ACCEPT  || { status="1"; echo "Setting up Rule: Custom_irc_TCP FAILED !!!"; exit 1; }
$IPT -t filter -A OUTPUT --match state --state RELATED,ESTABLISHED -j ACCEPT  || { status="1"; echo "Setting up Rule: CONNRACK_OUTPUT FAILED !!!"; exit 1; }
$IPT -t filter -P OUTPUT DROP || { status="1"; echo "Setting up Rule: Chain: OUTPUT Default Target FAILED !!!"; exit 1; }
echo "Done."
#  Define Rules for Chain: FORWARD
echo -n "Create Rules for Chain: FORWARD                    "
$IPT -t filter -P FORWARD DROP || { status="1"; echo "Setting up Rule: Chain: FORWARD Default Target FAILED !!!"; exit 1; }
echo "Done."
echo -n "Disable IP Forwarding.		"
echo 0 > /proc/sys/net/ipv4/ip_forward
echo "Done.
"
 echo -n "Enable Reverse Path Filtering      "
for i in /proc/sys/net/ipv4/conf/*/rp_filter ; do
echo 2 > $i 
done
echo "Done."
echo -n "Disable log_martians (logging).           "
for i in /proc/sys/net/ipv4/conf/*/log_martians ; do
echo 0 > $i 
done
echo "Done.
"
 echo -n "Enable Syn Cookies.          "
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
echo "Done."
}
stopFirewall() {
  echo -n "Shutdown KMyFirewall...       "
  $IPT -t filter -F || status="1"
  $IPT -t filter -X || status="1"
  $IPT -t filter -P INPUT ACCEPT || status="1"
  $IPT -t filter -P OUTPUT ACCEPT || status="1"
  $IPT -t filter -P FORWARD ACCEPT || status="1"
	echo "Done."
}
case $1 in
  start)
  stopFirewall
  startFirewall
  ;;
  stop)
  stopFirewall
  ;;
  restart)
  stopFirewall
  startFirewall
  ;;
  *)
  echo "Usage: sh kmyfirewall.sh { start | stop | restart } "
  ;;
  esac
if [ "$status" = "1" ]; then
  exit 1
else
  exit 0
fi