Source Code Custom Message SSH Before Login Prompt in Linux

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Custom Message SSH Before Login Prompt in Linux
Ivan Revelli - 15/May/2020

Spoiler: Content

[SHOWTOGROUPS=4,20]

View attachment 1587



Tested on Ubuntu 18.04 Server.

The file /etc/issue.net is a text file which contains a message or system identification to be printed before the login prompt of a telnet session. It may contain various ‘%-char’ (or, alternatively, ‘\-char’) sequences.

The common char for output some informations are:

1 2 3 4 5 6 7 8 9 10 11 12 13

b Insert the baudrate of the current line. d Insert the current date. s Insert the system name, the name of the operating system. l Insert the name of the current tty line. m Insert the architecture identifier of the machine, e.g., i686. n Insert the nodename of the machine, also known as the hostname. o Insert the domainname of the machine. r Insert the release number of the kernel, e.g., 2.6.11.12. t Insert the current time. u Insert the number of current users logged in. U Insert the string "1 user" or "<n> users" where <n> is the number of current users logged in. v Insert the version of the OS, e.g., the build-date etc.

If you want to display your IP Configuration you can simply add the following line to the issue file:

1	My IP address: \4{eth0}

[/SHOWTOGROUPS]

 

[ma123rina]

"Hey OP, I think I found a solution for you. You can modify the '/etc/issue' file to add your custom message before the login prompt. That should do the trick, give it a shot!"

 

[t0p]

"Hey guys, I've found a solution for this in Ubuntu using PAM. You can modify the `/etc/pam.d/common-session` file to add a custom message. Been using this for ages and it works like a charm."

 

[abeceda142]

"Hey OP, check out this thread for a solution: https://askubuntu.com/questions/984444/show-custom-message-before-login-prompt-in-ssh. It should give you some ideas on how to customize your SSH login prompt. Works on Ubuntu-based distros, might need some tweaking for other distros."