DenyHosts 是用 python2.3 编写的一个程序，会剖析 /var/log/secure 等文件，当发现同一个 ip 进行屡次 ssh 登录失败时会将其写入 /etc/hosts.dengy 文件，达到屏蔽该 ip 的目标。
Centos7 应用 DenyHosts 避免 ssh 暴力破解 Centos7 应用 DenyHosts 避免 ssh 暴力破解
下载 DenyHosts 包
[root@localhost ~]# wget http://jaist.dl.sourceforge.n…
装置 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
批改配置文件
将 daemon-control 中的 #DENYHOSTS_CFG = “/usr/share/denyhosts/denyhosts.cfg” 改为 DENYHOSTS_CFG = “/etc/denyhosts.cfg”
Centos7 应用 DenyHosts 避免 ssh 暴力破解 Centos7 应用 DenyHosts 避免 ssh 暴力破解
启动
[root@localhost DenyHosts-2.6]# ./daemon-control start（留神相对路径）
测试另外一台服务器近程连贯 172.16.1.16
默认容许五次，测试发现登陆失败五次之后不容许登陆
[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
登陆间断失败之后就会把 ip 地址写在 hosts.deny 文件
Centos7 应用 DenyHosts 避免 ssh 暴力破解 Centos7 应用 DenyHosts 避免 ssh 暴力破解
172.16.1.112 的 ip 曾经被限度，到此性能实现。