Mastering Linux Security and Hardening - Second Edition

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. At your own user account command prompt, run the following:

 sudo fdisk -l sudo -k sudo fdisk -l

Note how the sudo -k command resets your timer, so you'll have to enter your password again. Open visudo with the following command:

sudo visudo

In the Defaults specification section of the ...