Is there a tool for Permissions?

I want a mechanism that I want to remove specific permission like if the permission matched the condition then remove this. For example:

1. I want to remove user a to have permission to read this document.
2. I want to remove this team d to have permission to write this document.

I want help? I need this because I want to create a secured cloud storage.

Maybe I want help on how to parse the each permission string. Because I do not know the format for every permission string