如何用shell防止郵件暴力破解

郵箱伺服器是放在內網映射的公司IP，開放連接埠後，一直被不停的暴力破解，鬱悶死了。其中有個IP 有6W多次啊；從而利用指令碼屏蔽IP訪問。

1、指令碼如下：

#! /bin/bash
# author: kuangl
# mial: kuangl@orient-media.com
# date: 2013-05-04
source  /etc/profile
awk -F"[" '/disconnect from unknown/ {print $NF}' /var/log/maillog |grep -v "189.154.4.22" |sed "s/]//g"|sort -nr|uniq -c|sort|awk '{print $1"="$2}' >/root/bad_ip_tmp.txt
awk -F":" '/verification failed/ {print $5}' /var/log/maillog |grep -v "189.154.4.22" |grep -v "SASL"|sort -nr|uniq -c|awk '{print $1"="$2}' >>/root/bad_ip_tmp.txt
awk -F"-" '/\/phpmyadmin\/scripts\/setup\.php/  {print $1}' /var/log/httpd/access_log |grep -v "189.154.4.22" |sort -nr|uniq -c |sort  -n |awk '{print $1"="$2}' >>/root/bad_ip_tmp.txt
awk -F"-" '/ZmEu/ {print $1}' /var/log/httpd/access_log |grep -v "189.154.4.22" |sort -nr|uniq -c |sort  -n |awk '{print $1"="$2}' >>/root/bad_ip_tmp.txt
sort /root/bad_ip_tmp.txt|uniq >/root/bad_ip.txt
DEFINE="2"
for i in $(cat  /root/bad_ip.txt)
do
NUM=`echo $i |awk -F"=" '{print $1}'`
IP=`echo $i|awk  -F"=" '{print $2}'`
if [ $NUM -ge $DEFINE ];
then
iptables -L -n|grep $IP > /dev/null
if [ $? -gt 0 ];
then
iptables -I RH-Firewall-1-INPUT 4 -s $IP -j DROP
fi
fi
done

2、假如任務計劃5分鐘運行一次
*/5 * * * *  /home/kuangl/deny_bad_ip_for_smtp.sh
0 1 * * *   /etc/init.d/iptables restart

3、查看防火牆

DROP       all  --  192.241.206.14       0.0.0.0/0           DROP       all  --  198.50.251.242       0.0.0.0/0           DROP       all  --  198.23.245.154       0.0.0.0/0           DROP       all  --  217.139.66.140       0.0.0.0/0           DROP       all  --  134.0.27.102         0.0.0.0/0           DROP       all  --  222.73.115.102       0.0.0.0/0           DROP       all  --  218.22.226.6         0.0.0.0/0           DROP       all  --  218.22.226.5         0.0.0.0/0           DROP       all  --  202.158.163.158      0.0.0.0/0           DROP       all  --  109.169.86.193       0.0.0.0/0

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