iptables 默认安全规则脚本

 默认脚本只开启常规web服务器的80,3306,22端口

#vi default_firewall.sh
#!/bin/bash ######################################################################### # # File:         default_firewall.sh # Description:  # Language:     GNU Bourne-Again SHell # Version: 1.0 # Date: 2010-6-23 # Corp.: c1gstudio.com # Author: c1g # WWW: http://blog.c1gstudio.com ### END INIT INFO ###############################################################################
IPTABLES=/sbin/iptables
# start by flushing the rules $IPTABLES -P INPUT DROP $IPTABLES -P FORWARD ACCEPT $IPTABLES -P OUTPUT ACCEPT $IPTABLES -t nat -P PREROUTING ACCEPT $IPTABLES -t nat -P POSTROUTING ACCEPT $IPTABLES -t nat -P OUTPUT ACCEPT $IPTABLES -t mangle -P PREROUTING ACCEPT $IPTABLES -t mangle -P OUTPUT ACCEPT
$IPTABLES -F $IPTABLES -X $IPTABLES -Z $IPTABLES -t nat -F $IPTABLES -t mangle -F $IPTABLES -t nat -X $IPTABLES -t mangle -X $IPTABLES -t nat -Z
## allow packets coming from the machine $IPTABLES -A INPUT -i lo -j ACCEPT $IPTABLES -A OUTPUT -o lo -j ACCEPT
# allow outgoing traffic $IPTABLES -A OUTPUT -o eth0 -j ACCEPT
# block spoofing $IPTABLES -A INPUT -s 127.0.0.0/8 -i ! lo -j DROP
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT $IPTABLES -A INPUT -p icmp -j ACCEPT

# stop bad packets #$IPTABLES -A INPUT -m state --state INVALID -j DROP
# NMAP FIN/URG/PSH #$IPTABLES -A INPUT -i eth0 -p tcp --tcp-flags ALL FIN,URG,PSH -j DROP # stop Xmas Tree type scanning #$IPTABLES -A INPUT -i eth0 -p tcp --tcp-flags ALL ALL -j DROP #$IPTABLES -A INPUT -i eth0 -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP # stop null scanning #$IPTABLES -A INPUT -i eth0 -p tcp --tcp-flags ALL NONE -j DROP # SYN/RST #$IPTABLES -A INPUT -i eth0 -p tcp --tcp-flags SYN,RST SYN,RST -j DROP # SYN/FIN #$IPTABLES -A INPUT -i eth0 -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP # stop sync flood #$IPTABLES -N SYNFLOOD #$IPTABLES -A SYNFLOOD -p tcp --syn -m limit --limit 1/s -j RETURN #$IPTABLES -A SYNFLOOD -p tcp -j REJECT --reject-with tcp-reset #$IPTABLES -A INPUT -p tcp -m state --state NEW -j SYNFLOOD # stop ping flood attack #$IPTABLES -N PING #$IPTABLES -A PING -p icmp --icmp-type echo-request -m limit --limit 1/second -j RETURN #$IPTABLES -A PING -p icmp -j REJECT #$IPTABLES -I INPUT -p icmp --icmp-type echo-request -m state --state NEW -j PING

################################# ## What we allow #################################
# tcp ports
# smtp #$IPTABLES -A INPUT -p tcp -m tcp --dport 25 -j ACCEPT # http $IPTABLES -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT # pop3 #$IPTABLES -A INPUT -p tcp -m tcp --dport 110 -j ACCEPT # imap #$IPTABLES -A INPUT -p tcp -m tcp --dport 143 -j ACCEPT # ldap #$IPTABLES -A INPUT -p tcp -m tcp --dport 389 -j ACCEPT # https #$IPTABLES -A INPUT -p tcp -m tcp --dport 443 -j ACCEPT # smtp over SSL #$IPTABLES -A INPUT -p tcp -m tcp --dport 465 -j ACCEPT # line printer spooler #$IPTABLES -A INPUT -p tcp -m tcp --dport 515 -j ACCEPT # cups #$IPTABLES -A INPUT -p tcp -m tcp --dport 631 -j ACCEPT # mysql $IPTABLES -A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT # tomcat #$IPTABLES -A INPUT -p tcp -m tcp --dport 8080 -j ACCEPT # squid #$IPTABLES -A INPUT -p tcp -m tcp --dport 81 -j ACCEPT # nrpe #$IPTABLES -A INPUT -p tcp -m tcp --dport 15666 -j ACCEPT
## restrict some tcp things ##
# ssh $IPTABLES -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT #$IPTABLES -A INPUT -p tcp -m tcp --dport 6022 -j ACCEPT # samba (netbios) #$IPTABLES -A INPUT -p tcp -m tcp -s 192.168.0.0/16 --dport 137:139 -j ACCEPT # ntop #$IPTABLES -A INPUT -p tcp -m tcp -s 192.168.0.0/16 --dport 3000  -j ACCEPT