#!/bin/bash

cat /var/log/secure|awk '/Failed/{print $(NF-3)}'|sort|uniq -c|awk '{print $2"="$1;}' > /root/satools/black.txt
DEFINE="4"
for i in `cat /root/satools/black.txt`
do
 
IP=`echo $i |awk -F= '{print $1}'`
NUM=`echo $i|awk -F= '{print $2}'`
 
if [ "$NUM" -gt "$DEFINE" ]; then
grep "$IP" /etc/hosts.deny > /dev/null
 
if [ $? -gt 0 ]; then
echo "sshd:$IP" >> /etc/hosts.deny
fi
fi
done