使用DenyHosts防止ssh暴力破解

DenyHosts是用python2.3編寫的一個程序，會分析/var/log/secure等文件，當發現同一個ip進行屢次ssh登陸失敗時會將其寫入/etc/hosts.dengy文件，達到屏蔽該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

下載DenyHosts包
[root@localhost ~]# wget http://jaist.dl.sourceforge.n...
安裝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
製做配置文件
[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
將daemon-control中的#DENYHOSTS_CFG = "/usr/share/denyhosts/denyhosts.cfg"改成 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

啓動
[root@localhost DenyHosts-2.6]# ./daemon-control start（注意相對路徑）
測試另一臺服務器遠程鏈接172.16.1.16
默認容許五次，測試發現登錄失敗五次以後不容許登錄

[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
登錄連續失敗以後就會把ip地址寫在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已經被限制，到此功能實現。