Recently Acmes IT Security group published a new password policy, listed below, for strengthening the passwords on Linux servers. Your job is to provide good instructions for operations to install and configure PAM, Pluggable Authentication Modules, on all of the Ubuntu servers to meet the new policy.

Provide instructions that the operation staff can use to deploy PAM on all of the Ubuntu servers.

IT Security Policy 2-15

All Linux servers must adhere to the following standard:

All passwords must be a minimum of 8 characters

All passwords must include at least one number.

All passwords must include at least one lowercase letter.

All passwords must include at least one special character.

All accounts must permit only 4 retries after entering improper passwords.