Mastering Linux Security and Hardening

Hands-on lab for disabling the sudo timer

For this lab, you'll disable the sudo timer on your CentOS VM.

1. Log in to the same CentOS virtual machine that you used for the previous lab. We'll be using the user accounts that you've already created.
2. At your own user account command-prompt, enter the following commands:

        sudo fdisk -l        sudo systemctl status sshd        sudo iptables -L

You'll see that you only needed to enter the password once to do all three commands.

3. Open visudo with:

        sudo visudo

In the Defaults specification section of the file, add the following line:

        Defaults     timestamp_timeout = 0

Save the file and exit visudo.

4. Perform the commands that you performed in Step 2. This time, you should see that you have to enter a password every ...