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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: https://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 # Hylafax #$IPTABLES -A INPUT -p tcp -m tcp -s 192.168.0.0/16 –dport 4558:4559 -j ACCEPT # webmin #$IPTABLES -A INPUT -p tcp -m tcp -s 192.168.0.0/16 –dport 10000 -j ACCEPT # udp ports # DNS #$IPTABLES -A INPUT -p udp -m udp –dport 53 -j ACCEPT # DHCP #$IPTABLES -A INPUT -p udp -m udp –dport 67:68 -j ACCEPT # NTP #$IPTABLES -A INPUT -p udp -m udp –dport 123 -j ACCEPT # SNMP #$IPTABLES -A INPUT -p udp -m udp –dport 161:162 -j ACCEPT ## restrict some udp things ## # Samba (Netbios) #$IPTABLES -A INPUT -p udp -m udp -s 192.168.0.0/16 –dport 137:139 -j ACCEPT #$IPTABLES -A INPUT -p udp -m udp –sport 137:138 -j ACCEPT # finally – drop the rest #$IPTABLES -A INPUT -p tcp –syn -j DROP

设置权限

chmod u+x ./default_firewall.sh

运行脚本

./default_firewall.sh

查看iptables

#/sbin/iptables -nL

保存iptables

#/sbin/iptables-save > /etc/sysconfig/iptables

重启iptables

#/etc/init.d/iptables restart




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rev="post-1003" 1 comment

By C1G – 2010/06/29

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