I understand that what I want is really strange.
We have something like shared build server (mac mini, yosemite), which is located in public place in office; basically everybody have physical access to it.
We have special user account created for our project needs, and all necessary tools / passwords etc are configured under this user account.
We have a rather big group of people, who should have physical access to this user account from time to time.
As a (predicted) result we have simple "password" which is known to everybody, even to people outside of this group.
Is there any way / third-party tool to use phone applications like Google Authenticator, which will allow access to this specific user account to a predefined group of people, without relying on just password?
In general I'm looking for any solution which might solve my problem - login to account with "public password" to specific people only.