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  • 使用DenyHosts防止ssh暴力破解

    DenyHosts是用python2.3编写的一个程序,会分析/var/log/secure等文件,当发现同一个ip进行多次ssh登录失败时会将其写入/etc/hosts.dengy文件,达到屏蔽该ip的目的。

    Centos7使用DenyHosts防止ssh暴力破解Centos7使用DenyHosts防止ssh暴力破解

    下载DenyHosts包
    [root@localhost ~]# wget http://jaist.dl.sourceforge.net/project/denyhosts/denyhosts/2.6/DenyHosts-2.6.tar.gz
    安装DenyHosts
    [root@localhost ~]# tar xf DenyHosts-2.6.tar.gz
    [root@localhost ~]# cd DenyHosts-2.6
    [root@localhost DenyHosts-2.6]# python setup.py install
    制作配置文件
    [root@localhost DenyHosts-2.6]# cp denyhosts.cfg-dist /etc/denyhosts.cfg
    [root@localhost DenyHosts-2.6]# cp daemon-control-dist daemon-control
    [root@localhost DenyHosts-2.6]# chown root daemon-control
    [root@localhost DenyHosts-2.6]# chmod 700 daemon-control
    
    修改配置文件

    将daemon-control中的#DENYHOSTS_CFG = "/usr/share/denyhosts/denyhosts.cfg"改为 DENYHOSTS_CFG = "/etc/denyhosts.cfg"
    Centos7使用DenyHosts防止ssh暴力破解Centos7使用DenyHosts防止ssh暴力破解

    启动
    [root@localhost DenyHosts-2.6]# ./daemon-control start(注意相对路径)
    测试另外一台服务器远程连接172.16.1.16

    默认允许五次,测试发现登陆失败五次之后不允许登陆

    [root@localhost ~]# ssh abc@172.16.1.16
    abc@172.16.1.16's password: 
    Permission denied, please try again.
    abc@172.16.1.16's password: 
    Permission denied, please try again.
    abc@172.16.1.16's password: 
    Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
    [root@localhost ~]# 
    [root@localhost ~]# ssh abc@172.16.1.16
    abc@172.16.1.16's password: 
    Permission denied, please try again.
    abc@172.16.1.16's password: 
    Permission denied, please try again.
    abc@172.16.1.16's password: 
    Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
    [root@localhost ~]# ssh abc@172.16.1.16
    abc@172.16.1.16's password: 
    Permission denied, please try again.
    abc@172.16.1.16's password: 
    Permission denied, please try again.
    abc@172.16.1.16's password: 
    Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
    [root@localhost ~]# ssh abc@172.16.1.16
    abc@172.16.1.16's password: 
    Permission denied, please try again.
    abc@172.16.1.16's password: 
    Permission denied, please try again.
    abc@172.16.1.16's password: 
    Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
    [root@localhost ~]# ssh abc@172.16.1.16
    ssh_exchange_identification: read: Connection reset by peer
    
    查看hosts.deny文件

    登陆连续失败之后就会把ip地址写在hosts.deny文件
    Centos7使用DenyHosts防止ssh暴力破解Centos7使用DenyHosts防止ssh暴力破解
    172.16.1.112的ip已经被限制,到此功能实现。

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  • 原文地址:https://www.cnblogs.com/linuxprobe/p/14852892.html
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