防止ssh暴力破解

 #!/bin/bsah
/sbin/iptables -F
badip=`cat /var/log/secure |grep "Failed"|grep -Eo '([0-9]+\.){3}[0-9]+'|sort -n|uniq -c|awk ' $1>=10 {print $2}'` #錯誤登錄超過10次的ip
for i in $badip
do 
/sbin/iptables -I INPUT -s $i -j DROP 
done