Problem With script firewall, Please Checkh , thx

[hermansyah]

i have script which write rc.local
but client's can't conected internet

i hope friend's can check my script, what wrong wtih me
internet=ip statis

INternet ------ Proxy+Firewall ----- Local LAN

view http://indowebsiter.com/rc.local

or bellow

#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.
touch /var/lock/subsys/local
# 1.1 Internet Configuration.
#--------------------------------------------------------------------------------------------------------------
INET_IP="111.22.33.444"
INET_IFACE="eth0"
INET_BROADCAST="111.22.33.444"

# 1.2 Local Area Network configuration.
#--------------------------------------------------------------------------------------------------------------
LAN_IP="192.168.2.4"
NETMASK_PPE="192.168.2.0/24"
LAN_IFACE="eth1"

# 1.4 Localhost Configuration.
#--------------------------------------------------------------------------------------------------------------
LO_IFACE="lo"
LO_IP="127.0.0.1"

# 1.5 IPTables Configuration
#--------------------------------------------------------------------------------------------------------------
IPTABLES="/sbin/iptables"

# 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

# 3. /proc set up.
#--------------------------------------------------------------------------------------------------------------
echo "1" > /proc/sys/net/ipv4/ip_forward
echo "1" > /proc/sys/net/ipv4/ip_dynaddr

# clear $IPTABLES
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -F
$IPTABLES -t nat -F
$IPTABLES -t mangle -F

# erase all chains that's not default in filter and nat table.
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -X
$IPTABLES -t nat -X
$IPTABLES -t mangle -X

# 4.1.1 Set policies
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -P INPUT DROP
$IPTABLES -P OUTPUT DROP
$IPTABLES -P FORWARD DROP

# 4.1.2 Create userspecified chains
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -N bad_tcp_packets

# Create separate chains for ICMP, TCP and UDP to traverse
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -N allowed
$IPTABLES -N tcp_packets
$IPTABLES -N udp_packets
$IPTABLES -N icmp_packets

# bad_tcp_packets chain
#--------------------------------------------------------------------------------------------------------------
$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 "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
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 21 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 22 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 80 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 113 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 443 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 3128 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 10000 -j allowed

# UDP ports
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A udp_packets -p UDP -s 0/0 --source-port 53 -j ACCEPT
$IPTABLES -A udp_packets -p UDP -s 0/0 --source-port 123 -j ACCEPT
#$IPTABLES -A udp_packets -p UDP -s 0/0 --source-port 2074 -j ACCEPT
#$IPTABLES -A udp_packets -p UDP -s 0/0 --source-port 4000 -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
#--------------------------------------------------------------------------------------------------------------
$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

# Bad TCP packets we don't want.
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A INPUT -p tcp -j bad_tcp_packets

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

# Rules for special networks not part of the Internet
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $LO_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $LAN_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $INET_IP -j ACCEPT

# Rules for incoming packets from anywhere.
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A INPUT -p ALL -d $INET_IP -m state --state ESTABLISHED,RELATED \
-j ACCEPT
$IPTABLES -A INPUT -p TCP -j tcp_packets
$IPTABLES -A INPUT -p UDP -j udp_packets
$IPTABLES -A INPUT -p ICMP -j icmp_packets

# 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: "

# Bad TCP packets we don't want
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A FORWARD -p tcp -j bad_tcp_packets

# Accept the TCP packets we actually want to forward
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A FORWARD -p tcp --dport 21 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 22 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 25 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 26 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 80 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 110 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 443 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 3306 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 5432 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 5050 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 10000 -i $LAN_IFACE -j ACCEPT

# Accept the UDP packets we actually want to forward
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A FORWARD -p udp --dport 5050 -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -p udp --dport 5060 -i $LAN_IFACE -j ACCEPT

# FOWARD yang statusnya udah konek
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -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: "

# Bad TCP packets we don't want.
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A OUTPUT -p tcp -j bad_tcp_packets

# Mo keluar silahkan kan udah di filter seblumya, jadi port2 tertentu aja yg boleh
#--------------------------------------------------------------------------------------------------------------
$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

# Special OUTPUT rules to decide which IP's to allow.
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG \
--log-level DEBUG --log-prefix "IPT OUTPUT packet died: "

# Enable simple IP Forwarding and Network Address Translation
#--------------------------------------------------------------------------------------------------------------
#$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -d 0/0 -j MASQUERADE
$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_IP
#$IPTABLES -t nat -A POSTROUTING -s NETMASK_PPE -o $INET_IFACE -d 0/0 -j MASQUERADE
#$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_IP

#PREROUTING chain
#--------------------------------------------------------------------------------------------------------------
$IPTABLES -t nat -A PREROUTING -i $LAN_IFACE -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
#$IPTABLES -t nat -A PREROUTING -i $LAN_IFACE -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.2.3:3128

service iptables save



Terimakasih/Thankyou

SIGN

Hermansyah - Jakarta (Indonesia)

[Lazydog]

What linux version are you running?
Would it be possible to post that 'service iptables save' file?

[hermansyah]

@Robert
tahnk you for your attention

I used Centos 5.1
my problem is client can't acces port 80 which direct to port 3128 via squid service, but port 22,25,110 n other port in my rule OK.

i'm confuse because basicly 'i'm web developer, i'm studying networking.

i hope Mr. RObert n other friend's can help me

Thank you / Terimakasih

SIGN

HErmansyah - Jakarta Indonesia

ym : syah_ajah

[Lazydog]

Is your proxy and the firewall on the same box?