• The hostname of your virtual machine must be your login ending with 42 (e.g., wil42). You will have to modify this hostname during your evaluation. • You have to implement a strong password policy. • You have to install and configure sudo following strict rules. • In addition to the root user, a user with your login as username has to be present. • This user has to belong to the user42 and sudo groups.

• Your password has to expire every 30 days. • The minimum number of days allowed before the modification of a password will be set to 2. • The user has to receive a warning message 7 days before their password expires. • Your password must be at least 10 characters long. It must contain an uppercase letter, a lowercase letter, and a number. Also, it must not contain more than 3 consecutive identical characters. • The password must not include the name of the user. • The following rule does not apply to the root password: The password must have at least 7 characters that are not part of the former password. • Of course, your root password has to comply with this policy.

• Authentication using sudo has to be limited to 3 attempts in the event of an incor- rect password. • A custom message of your choice has to be displayed if an error due to a wrong password occurs when using sudo. • Each action using sudo has to be archived, both inputs and outputs. The log file has to be saved in the /var/log/sudo/ folder. • The TTY mode has to be enabled for security reasons. • For security reasons too, the paths that can be used by sudo must be restricted. Example: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin

At server startup, the script will display some information (listed below) on all ter- minals every 10 minutes (take a look at wall). The banner is optional. No error must be visible. Your script must always be able to display the following information: • The architecture of your operating system and its kernel version. • The number of physical processors. • The number of virtual processors. • The current available RAM on your server and its utilization rate as a percentage. • The current available memory on your server and its utilization rate as a percentage. • The current utilization rate of your processors as a percentage. • The date and time of the last reboot. • Whether LVM is active or not. • The number of active connections. • The number of users using the server. • The IPv4 address of your server and its MAC (Media Access Control) address. • The number of commands executed with the sudo program.