Local user accounts created in ESXi including the root user has a default password expiration of 99999 days before administrators need to change the password. Users can control the password expiry by modifying the following ESXi Advanced Setting called Security.PasswordMaxDays which is also referenced in the ESXi Security Documentation along with other advanced configurations.
Password rotation or updates are typically managed by an organizations password management solution which is responsible keeping track and notifying when local passwords are about to expire. With that said, not everyone has a password management solution and how do you quickly check how many days left before an account password expires on an ESXi host? I initially thought this should be pretty simple to figure out, especially with utilities like chage but the version that ESXi ships is a stripped down version via Busybox and it did not provide any expiry details like the typical chage version might.
This meant, that the password expiry would need to be calculated manually and luckily, this is not a new concept. The answer lies in the /etc/shadow file which contains a number of fields that can then be used to figure out the number of days left before an account expires or if has already expired. I will not bore you with the details, but you can create the following shell script which can run in the ESXi Shell to provide you with the answer.
