IPTABLES 1.4.x [SOLVED]

#!/bin/sh
#
# rc.firewall - Initial SIMPLE IP Firewall script for Linux 2.4.x and iptables
#
# Copyright (C) 2001  Oskar Andreasson <bluefluxATkoffeinDOTnet>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program or from the site that you downloaded it
# from; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA  02111-1307   USA
#

###########################################################################
#
# 1. Configuration options.
#

#
# 1.1 Internet Configuration.
#

INET_IP="xx.xx.xx.xx"
INET_IFACE="eth0"
INET_BROADCAST="xx.xx.xx.xx"

#
# 1.1.1 DHCP
#

#
# 1.1.2 PPPoE
#

#
# 1.2 Local Area Network configuration.
#
#
# your LAN's IP range and localhost IP. /24 means to only use the first 24
# bits of the 32 bit IP address. the same as netmask 255.255.255.0
#

LAN_IP="192.168.xx.xx"
LAN_IP_RANGE="192.168.0.0/16"
LAN_IFACE="eth1"

#
# 1.3 DMZ Configuration.
#

#
# 1.4 Localhost Configuration.
#

LO_IFACE="lo"
LO_IP="127.0.0.1"

#
# 1.5 IPTables Configuration.
#

IPTABLES="/sbin/iptables"

#
# 1.6 Other Configuration.
#

###########################################################################
#
# 2. Module loading.
#

#
# Needed to initially load modules
#

/sbin/depmod -a

#
# 2.1 Required modules
#
#/sbin/modprobe ip_tables
#/sbin/modprobe ip_conntrack
#/sbin/modprobe iptable_filter
#/sbin/modprobe iptable_mangle
/sbin/modprobe iptable_nat
#/sbin/modprobe ipt_LOG
/sbin/modprobe ipt_limit
#/sbin/modprobe ipt_state

#
# 2.2 Non-Required modules
#

#/sbin/modprobe ipt_owner
#/sbin/modprobe ipt_REJECT
#/sbin/modprobe ipt_MASQUERADE
#/sbin/modprobe ip_conntrack_ftp
#/sbin/modprobe ip_conntrack_irc
#/sbin/modprobe ip_nat_ftp
#/sbin/modprobe ip_nat_irc

###########################################################################
#
# 3. /proc set up.
#

#
# 3.1 Required proc configuration
#
# Мы используем NAT

echo "1" > /proc/sys/net/ipv4/ip_forward

#
# 3.2 Non-Required proc configuration
#

#echo "1" > /proc/sys/net/ipv4/conf/all/rp_filter
#echo "1" > /proc/sys/net/ipv4/conf/all/proxy_arp
#echo "1" > /proc/sys/net/ipv4/ip_dynaddr

###########################################################################
#
# 4. rules set up.
#

# Cleaning iptables
$IPTABLES -F
$IPTABLES -X
$IPTABLES -t nat -F
$IPTABLES -t nat -X

######
# 4.1 Filter table
#

#
# 4.1.1 Set policies
#

$IPTABLES -P INPUT DROP
$IPTABLES -P OUTPUT DROP
$IPTABLES -P FORWARD DROP

#
# 4.1.2 Create userspecified chains
#

#
# Create chain for bad tcp packets
#

$IPTABLES -N bad_tcp_packets

#
# Create separate chains for ICMP, TCP and UDP to traverse
#

$IPTABLES -N allowed
$IPTABLES -N tcp_packets_in
$IPTABLES -N tcp_packets_in_lan
$IPTABLES -N udp_packets
$IPTABLES -N icmp_packets

# 4.1.3 Create content in userspecified chains
#

#
# bad_tcp_packets chain
#
$IPTABLES -A bad_tcp_packets -p tcp --tcp-flags SYN,ACK SYN,ACK -m state --state NEW -m limit --limit 10/minute --limit-burst 3 -j LOG --log-prefix "IPT SPO$
$IPTABLES -A bad_tcp_packets -p tcp --tcp-flags SYN,ACK SYN,ACK -m state --state NEW -j REJECT --reject-with tcp-reset
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j LOG --log-prefix "IPT New not syn:"
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j DROP

#
# allowed chain
#

$IPTABLES -A allowed -p TCP --syn -j ACCEPT
$IPTABLES -A allowed -p TCP -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A allowed -p TCP -j DROP

#
# TCP rules
#

#            =I= Подключения из интернет

# 1) FTP
$IPTABLES -A tcp_packets_in -p TCP -s 0/0 --dport 21 -j allowed

# 2) WEB-сервер
$IPTABLES -A tcp_packets_in -p TCP -s 0/0 --dport 80 -j allowed

# 3) DNS-сервер
$IPTABLES -I INPUT 1 -p tcp --dport 53 -j ACCEPT
$IPTABLES -I INPUT 1 -p udp --dport 53 -j ACCEPT
$IPTABLES -I INPUT 1 -p tcp --dport 1027 -j ACCEPT
$IPTABLES -I INPUT 1 -p udp --dport 1027 -j ACCEPT
$IPTABLES -I INPUT 1 -p tcp --dport 62918 -j ACCEPT
$IPTABLES -I INPUT 1 -p udp --dport 62918 -j ACCEPT
$IPTABLES -I INPUT 1 -p tcp --dport 62921 -j ACCEPT
$IPTABLES -I INPUT 1 -p udp --dport 62921 -j ACCEPT

# 3) почтовик
$IPTABLES -A tcp_packets_in -p TCP -s 0/0 --dport 25 -j allowed
$IPTABLES -A tcp_packets_in -p TCP -s 0/0 --dport 110 -j allowed

# 1) SSH
$IPTABLES -A tcp_packets_in -p TCP --dport 22 -j allowed
#            =II= Подключения из локалки

# 2) Прокси
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 3128 -j allowed

# 3) MySQL
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 3306 -j allowed

# 3) Самба
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 139 -j allowed
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 445 -j allowed

# 5) Webmin
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 10000 -j allowed

# 1) FTP
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 21 -j allowed

# 3) Postgres
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 5432 -j allowed

# 5) почтовик
# SMTP port
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 25 -j allowed

# Pop port
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 110 -j allowed

# Imap port
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 143 -j allowed

# pop-ssl port
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 995 -j allowed

# imap-ssl port
$IPTABLES -A tcp_packets_in_lan -p TCP --dport 993 -j allowed

# лог аномальных запросов из локальной сети
$IPTABLES -A tcp_packets_in_lan -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT LAN_ANOMALYES: "


#
# UDP ports
#
# Из UDP нам понадобится только ДНС

$IPTABLES -A udp_packets -p UDP -s 0/0 --destination-port 53 -j ACCEPT

#
# In Microsoft Networks you will be swamped by broadcasts. These lines
# will prevent them from showing up in the logs.
#

$IPTABLES -A udp_packets -p UDP -i $INET_IFACE -d $INET_BROADCAST --destination-port 135:139 -j DROP

#
# If we get DHCP requests from the Outside of our network, our logs will
# be swamped as well. This rule will block them from getting logged.
#

#$IPTABLES -A udp_packets -p UDP -i $INET_IFACE -d 255.255.255.255 --destination-port 67:68 -j DROP

#
# ICMP rules
#
# ПИНГИ eth0
#$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 8 -j ACCEPT
#$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT

# ПИНГИ eth1
#$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 8 -j ACCEPT
#$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT

#
# 4.1.4 INPUT chain
#

$IPTABLES -A INPUT -p ALL -i $LO_IFACE -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LAN_IFACE -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -p ALL -d $INET_IP -m state --state ESTABLISHED,RELATED -j ACCEPT

#
# Bad TCP packets we don't want.
#

$IPTABLES -A INPUT -p tcp -j bad_tcp_packets

#
# Rules for special networks not part of the Internet
#

$IPTABLES -A INPUT -p TCP -i $LAN_IFACE -s $LAN_IP_RANGE -j tcp_packets_in_lan
$IPTABLES -A INPUT -p UDP -i $LAN_IFACE -j udp_packets
$IPTABLES -A INPUT -p ICMP -i $LAN_IFACE -j icmp_packets

#
# Special rule for DHCP requests from LAN, which are not caught properly
# otherwise.
#
# DHCP у нас не на этом сервере
#$IPTABLES -A INPUT -p UDP -i $LAN_IFACE --dport 67 --sport 68 -j ACCEPT

#
# Rules for incoming packets from the internet.
#
$IPTABLES -A INPUT -p TCP -i $INET_IFACE -j tcp_packets_in
$IPTABLES -A INPUT -p UDP -i $INET_IFACE -j udp_packets
$IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets

#
# If you have a Microsoft Network on the outside of your firewall, you may
# also get flooded by Multicasts. We drop them so we do not get flooded by
# logs
#
$IPTABLES -A INPUT -i $INET_IFACE -d 224.0.0.0/8 -j DROP
$IPTABLES -A INPUT -i $LAN_IFACE -d 224.0.0.0/8 -j DROP

#
# Log weird packets that don't match the above.
#

$IPTABLES -A INPUT -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT INPUT packet died: "

#
# 4.1.5 FORWARD chain
#

#
# Bad TCP packets we don't want
#

$IPTABLES -A FORWARD -p tcp -j bad_tcp_packets

#
# Accept the packets we actually want to forward
#

$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

# Для роутинга в локальной сети
$IPTABLES -A FORWARD -s 192.168.0.0/16 -d 192.168.0.0/16 -j ACCEPT

# my
$IPTABLES -A FORWARD -i $LAN_IFACE -s 192.168.xx.xx -j ACCEPT

#Для NTP Servers
$IPTABLES -A FORWARD -i $LAN_IFACE -d 213.239.201.102 -j ACCEPT

#
# Log weird packets that don't match the above.
#

$IPTABLES -A FORWARD -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT FORWARD packet died: "

#
# 4.1.6 OUTPUT chain
#

#
# Bad TCP packets we don't want.
#

$IPTABLES -A OUTPUT -p tcp -j bad_tcp_packets

#
# Special OUTPUT rules to decide which IP's to allow.
#

$IPTABLES -A OUTPUT -p ALL -s $LO_IP -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $LAN_IP -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $INET_IP -j ACCEPT

#
# Log weird packets that don't match the above.
#

$IPTABLES -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG \
--log-level DEBUG --log-prefix "IPT OUTPUT packet died: "

######
# 4.2 nat table
#

#
# 4.2.1 Set policies
#

#
# 4.2.2 Create user specified chains
#

#
# 4.2.3 Create content in user specified chains
#

#
# 4.2.4 PREROUTING chain
#

#
# 4.2.5 POSTROUTING chain
#

#my
$IPTABLES -t nat -A POSTROUTING -s 192.168.xx.xx -j SNAT --to-source $INET_IP

# for RSYNC
$IPTABLES -t nat -A POSTROUTING -p tcp -m tcp --dport 873 -j SNAT --to-source $INET_IP

#
# Enable simple IP Forwarding and Network Address Translation
#
#$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_IP

#
# 4.2.6 OUTPUT chain
#

######
# 4.3 mangle table
#

#
# 4.3.1 Set policies
#

#
# 4.3.2 Create user specified chains
#

#
# 4.3.3 Create content in user specified chains
#

#
# 4.3.4 PREROUTING chain
#

#
# 4.3.5 INPUT chain
#

#
# 4.3.6 FORWARD chain
#

#
# 4.3.7 OUTPUT chain
#

#
# 4.3.8 POSTROUTING chain
#