There are probably many scenario’s where you’d like to identify which Entra groups contain ‘all users’, ‘all guests’ or a combination (all members+all guests).
In my case, I want to use this in M365Permissions, but also needed it for a Maester test to be more precise. It had to be language and implementation agnostic.
M365Permissions uses this mainly for reports that look at oversharing (e.g. when securing a tenant or implementing copilot). But this could also be useful for red/blue teams or any other tenant analysis tooling.
In M365Permissions, I initially looked at the dynamic rule itself, but this is unreliable. Dynamic rules can contain many additional components and can be ordered or written in many ways or the group may have been created without a dynamic rule through e.g. automation.
So I decided to use another approach!
Just get all tenant users from Graph (counts per type).
Then for a given group, look if it matches one of those counts and return a type. Of course, casting members to users to avoid counting devices and looking up membership recursively 🙂
Function: https://github.com/jflieben/assortedFunctionsV2/blob/main/Get-EntraDynamicGroupType.ps1
