I manage and host a website for a local take-out store and they got a 3rd party to implement online ordering as it handles all the CC stuff etc and they need access to the account. So I gave them SSH credentials to use SSH FTP and I am able to login fine myself.
They are asking for a "master password" and sent me this screenshot. I've never seen this before.

What exactly is this password and why would it be prompting them for it? The server is a fairly standard CentOS/Apache setup.
They are asking for a "master password" and sent me this screenshot. I've never seen this before.

What exactly is this password and why would it be prompting them for it? The server is a fairly standard CentOS/Apache setup.