初始化簡單的IP放火牆(Script)(轉)
初始化簡單的IP放火牆(Script)(轉)[@more@]#!/bin/sh## rc.firewall - Initial SIMPLE IP Firewall test script for 2.4.x## Author: Oskar Andreasson # (c) of BoingWorld.com, use at your own risk, do whatever you please with# it as long as you don't distribute this with due credits to# BoingWorld.com############# Configuration options, these will speed you up getting this script to# work with your own setup.## your LAN's IP range and localhost IP. /24 means to only use the first 24# bits of the 32 bit IP adress. the same as netmask 255.255.255.0## STATIC_IP is used by me to allow myself to do anything to myself, might# be a security risc but sometimes I want this. If you don't have a static# IP, I suggest not using this option at all for now but it's still# enabled per default and will add some really nifty security bugs for all# those who skips reading the documentation=)LAN_IP_RANGE="192.168.0.0/24"LAN_IP="192.168.0.2/32"LAN_BCAST_ADRESS="192.168.0.255/32"LOCALHOST_IP="127.0.0.1/32"STATIC_IP="194.236.50.155/32"INET_IFACE="eth0"LAN_IFACE="eth1"IPTABLES="/usr/local/sbin/iptables"########## Load all required IPTables modules### Needed to initially load modules#/sbin/depmod -a## Adds some iptables targets like LOG, REJECT and MASQUARADE.#/sbin/modprobe ipt_LOG#/sbin/modprobe ipt_REJECT#/sbin/modprobe ipt_MASQUERADE## Support for owner matching##/sbin/modprobe ipt_owner## Support for connection tracking of FTP and IRC.##/sbin/modprobe ip_conntrack_ftp#/sbin/modprobe ip_conntrack_irc#CRITICAL: Enable IP forwarding since it is disabled by default.#echo "1" > /proc/sys/net/ipv4/ip_forward# Dynamic IP users:## If you get your IP address dynamically from SLIP, PPP, or DHCP, enable this# option. This enables dynamic-ip address hacking in IP MASQ, making the connection# with Diald and similar programs much easier.##echo "1" > /proc/sys/net/ipv4/ip_dynaddr# Enable simple IP FORWARDing and Masquerading## NOTE: The following is an example for an internal LAN, where the lan# runs on eth1, and the Internet is on eth0.## Please change the network devices to match your own configuration.#$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j MASQUERADE$IPTABLES -A FORWARD -i $LAN_IFACE -j ACCEPT$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT$IPTABLES -A FORWARD -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT FORWARD packet died: "## set default policies for the INPUT, FORWARD and OUTPUT chains#$IPTABLES -P INPUT DROP$IPTABLES -P OUTPUT DROP$IPTABLES -P FORWARD DROP## Create separate chains for ICMP, TCP and UDP to traverse#$IPTABLES -N icmp_packets$IPTABLES -N tcp_packets$IPTABLES -N udpincoming_packets## the allowed chain for TCP connections## This chain will be utilised if someone tries to connect to an allowed# port from the internet. If they are opening the connection, or if it's# already established we ACCEPT the packages, if not we fuck them. This is# where the state matching is performed also, we allow ESTABLISHED and# RELATED packets.$IPTABLES -N allowed$IPTABLES -A allowed -p TCP --syn -j ACCEPT$IPTABLES -A allowed -p TCP -m state --state ESTABLISHED,RELATED -j ACCEPT$IPTABLES -A allowed -p TCP -j DROP## ICMP rules#$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 0 -j ACCEPT$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 3 -j ACCEPT$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 5 -j ACCEPT$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT## TCP rules#$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$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 113 -j allowed## UDP ports#$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 53 -j ACCEPT$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 123 -j ACCEPT$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 2074 -j ACCEPT$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 4000 -j ACCEPT## PREROUTING chain.## Do some checks for obviously spoofed IP's#$IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 192.168.0.0/16 -j DROP$IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 10.0.0.0/8 -j DROP$IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 172.16.0.0/12 -j DROP## INPUT chain## establish the basic INPUT chain and filter the packets onto the correct# chains.#$IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets$IPTABLES -A INPUT -p TCP -i $INET_IFACE -j tcp_packets$IPTABLES -A INPUT -p UDP -i $INET_IFACE -j udpincoming_packets$IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_BCAST_ADRESS -j ACCEPT$IPTABLES -A INPUT -p ALL -d $LOCALHOST_IP -j ACCEPT$IPTABLES -A INPUT -p ALL -d $LAN_IP -j ACCEPT$IPTABLES -A INPUT -p ALL -d $STATIC_IP -m state --state ESTABLISHED,RELATED -j ACCEPT$IPTABLES -A INPUT -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT INPUT packet died: "## OUTPUT chain## establish the basic OUTPUT chain and filter them onto the correct chain#$IPTABLES -A OUTPUT -p ALL -s $LOCALHOST_IP -j ACCEPT$IPTABLES -A OUTPUT -p ALL -s $LAN_IP -j ACCEPT$IPTABLES -A OUTPUT -p ALL -s $STATIC_IP -j ACCEPT$IPTABLES -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT OUTPUT packet died:
來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/8225414/viewspace-940690/,如需轉載,請註明出處,否則將追究法律責任。
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