CentOS7防ssh爆破脚本

touch /etc/black.txt

cat << \EOF > /etc/secure_ssh.sh
#!/bin/bash
#Author：院长
#QQ群：645072509
    cat /var/log/secure|awk '/Failed/{print $(NF-3)}'|sort|uniq -c|awk '{print $2"="$1;}' > /etc/black.txt
    for i in `cat  /etc/black.txt`
    do
      IP=`echo $i |awk -F= '{print $1}'`
      NUM=`echo $i|awk -F= '{print $2}'`
       if [ $NUM -gt 3 ];then
          grep $IP /etc/hosts.deny > /dev/null
        if [ $? -gt 0 ];then
          echo "sshd:$IP:deny" >> /etc/hosts.deny
        fi
      fi
    done
    EOF

echo  "* * * * *  sh /etc/secure_ssh.sh" >> /etc/crontab

chmod +x /etc/secure_ssh.sh

crontab /etc/crontab