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3

How can I allow access to SSH only at a specific time?

rated 0 times [ 3] [ 0] / answers: 1 / hits: 746 / 1 Year ago, tue, january 10, 2023, 12:45:07

Based on Ubuntu 18.04,

I want to allow users to access only from 9 a.m. to 5 p.m.(working time) on the SSH server. (used OpenSSH-server package)

I've looked up all the materials I think will help you from user management to PAM settings on Google, but I don't think there's any information to restrict access by SSH time zone.

(But, I have not to use firewall-related services like ufw.)

If you can help me, please let me know. Thank you.

(Please understand that my English can be unnatural because I am not good at English.)

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answered 1 Year ago leadprogres · Accepted Answer

Use a cron job to stop and start the ssh server at specific times. For example create a file /etc/cron.d/start-stop-ssh with the following contents:

0 9 * * * root /usr/sbin/service ssh start

0 17 * * * root /usr/sbin/service ssh stop

This will start the ssh service everyday at 9:00 and stop it everyday at 17:00.

Please note that when the service is stopped nobody (even admin) will be able to login via ssh.