iptables settings

firewall

#!/bin/sh
# firewall settings
 
### BEGIN INIT INFO
# Provides: firewall
# Required-Start: $remote_fs $syslog $network
# Required-Stop: $remote_fs $syslog $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: iptables firewall
# Description: iptables initialization script
### END INIT INFO
 
# purge tables
iptables -t filter -F
 
# purge rules
iptables -t filter -X
 
# deny any in and out
iptables -t filter -P INPUT DROP
iptables -t filter -P FORWARD DROP
iptables -t filter -P OUTPUT DROP
 
# keep alive connections
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
 
# Loopback
iptables -t filter -A INPUT -i lo -j ACCEPT
iptables -t filter -A OUTPUT -o lo -j ACCEPT
 
# ICMP
iptables -t filter -A INPUT -p icmp -j ACCEPT
iptables -t filter -A OUTPUT -p icmp -j ACCEPT
 
# SSH
iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 22 -j ACCEPT
 
# DNS
iptables -t filter -A OUTPUT -p tcp --dport 53 -j ACCEPT
iptables -t filter -A OUTPUT -p udp --dport 53 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 53 -j ACCEPT
iptables -t filter -A INPUT -p udp --dport 53 -j ACCEPT
 
# DNS 2
iptables -A INPUT -p tcp -s xxx.xxx.xxx.xxx --sport 1024:65535 -d my.ip.address.xxx --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp -s my.ip.address.xxx --sport 53 -d xxx.xxx.xxx.xxx --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT
 
# NTP
iptables -t filter -A OUTPUT -p udp --dport 123 -j ACCEPT
 
# Mail SMTP:25
iptables -t filter -A INPUT -p tcp --dport 25 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 25 -j ACCEPT
 
# Mail IMAPS:993
iptables -t filter -A INPUT -p tcp --dport 993 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 993 -j ACCEPT
 
# HTTP
iptables -t filter -A OUTPUT -p tcp --dport 80 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 443 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 8443 -j ACCEPT
 
# FTP
iptables -t filter -A OUTPUT -p tcp --dport 20:21 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 20:21 -j ACCEPT
iptables -t filter -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
 
# SVN
#iptables -A INPUT -p tcp -i eht0 --dport 3690 -j ACCEPT
 
# GIT
#iptables -A OUTPUT -o eth0 -p tcp --dport 9418 -m state --state NEW,ESTABLISHED -j ACCEPT
#iptables -A INPUT -i eth0 -p tcp --sport 9418 -m state --state ESTABLISHED -j ACCEPT
 
# WEBMIN
iptables -A INPUT -p tcp -m tcp --dport 10000 -j ACCEPT