Tuesday, 5 September 2017

How to Setup Linux SSH Login Banner on Centos/RHEL 7



Most of the system administrator whenever configure Linux Servers always use login banner for sending a message before authentication. The banner contains some security warning information or general information. This option is only available for protocol version 2. By default, no banner is configured in SSH.

Steps to configure SSH pre login banner:

Step 1: Open /etc/issue.net file and append the below message in this file:

Welcome to LinuxCNF Server SSH Login!’

Step 2: Search “Banner none” /etc/ssh/sshd_config and replace with the parameter“Banner /etc/issue.net”

[root@linuxcnf ~]# vi /etc/ssh/sshd_config
Banner /etc/issue.net

Save and close the file.

Step 3: Restart sshd service to take effect as configured in file:

[root@linuxcnf ~]# service sshd restart
Redirecting to /bin/systemctl restart  sshd.service
[root@linuxcnf ~]#

Step 4: verify the above configuration:

login as: linuxcnf
'Welcome to LinuxCNF Server SSH Login!'
linuxcnf@192.168.43.106's password:
Last login: Sun Aug 27 09:48:15 2017 from 192.168.43.103
[linuxcnf@linuxcnf ~]$

You have done, banner is appearing before login.

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