本文主要是介绍Linux防止暴力破解密码脚本，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
1.认识记录linux记录安全的日志
[root@testpm ~]# cd /var/log/
[root@testpm log]# ls | grep secure
secure
2.该日志的内容查看
[root@testpm log]# tail -f secure
#表示ssh身份验证失败
Aug 29 23:35:03 testpm sshd[111245]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.43.199 user=root
Aug 29 23:35:03 testpm sshd[111245]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
#表示root用户密码输出失败
Aug 29 23:35:04 testpm sshd[111245]: Failed password for root from 192.168.43.199 port 50602 ssh2
#表示root用户密码输入正确
Aug 29 23:35:44 testpm sshd[111245]: Accepted password for root from 192.168.43.199 port 50602 ssh2
#表示给root用户打开了一个终端
Aug 29 23:35:44 testpm sshd[111245]: pam_unix(sshd:session): session opened for user root by (uid=0)
#从192.168.43.199端口50602:11接收到断开连接：用户已断开连接
Aug 29 23:36:26 testpm sshd[111245]: Received disconnect from 192.168.43.199 port 50602:11: disconnected by user
#表示断开连接
Aug 29 23:36:26 testpm sshd[111245]: Disconnected from 192.168.43.199 port 50602
#表示root用户关闭了会话也就是退出了终端
Aug 29 23:36:26 testpm sshd[111245]: pam_unix(sshd:session): session closed for user root
如果传了公钥通过密钥登陆提示如下：
#表示接受root用户的密钥
Aug 29 23:50:31 testpm sshd[13123]: Accepted publickey for root from 192.168.43.199 port 50610 ssh2: RSA SHA256:HiUg8OQ5Zydu7e2vEPHAdM3TiLiQMCXX8m0mLdFgpqA
#表示为root用户打开会话
Aug 29 23:50:31 testpm sshd[13123]: pam_unix(sshd:session): session opened for user root by (uid=0)
2.编写密码输入错误三次将该ip禁止连接的脚本
[root@testpm script]# vim ssh.sh
#!/usr/bin/bash
#这是一个防止破解密码的脚本，当用户输入密码错误次数大于3次时，将禁止连接服务器
ip=`cat /var/log/secure | awk '/Failed password/ {print $11}' | sort | uniq`
num=`awk '/Failed password/ {print $11}' /var/log/secure | awk '{ips[i]++} END{print $i, ips[i]}' | awk '{print $2}'`
if [ $num -ge 3 ];then
echo "sshd:$ip" >> /etc/hosts.deny
fi
添加到计划任务中
[root@testpm script]# crontab -l
* * * * * /usr/bin/bash /opt/script/ssh.sh
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