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Correct way to setup linux company share folder with usable permissions

I've just started working for a small company that has a globally shared folder run from an Ubuntu file server (Raid 5, etc) shared by Samba.
The workstations (Centos) are all fstab setup to mount this samba share in their root file system -> /Data/.



The client fstab configs :



//10.1.1.3/DATA01 /DATA01 cifs  username=username,password=password 0 0



The samba configuration for the share :



[DATA01]
path = /DATA01
writeable = yes


Before I started the boss had decided he'd had enough of unix permissions and user mismatch "problems", so every workstation and server has the same user and group name (the current project name) - we'll call this project. He'd also made sure that the User UID on every machine was identical - i'm not sure how important this is at a practical level.



So in short, a ls -l /Data results in items that are chowned by project : project.




This is what I've just walked into. My job here is to administer all of this, but i'll add i'm a windows programmer by experience so my Linux sysadmin knowledge is more theoretical than practical (I took the job to learn their industry as i'm attempting a career pivot).



So the setup works to an extent, as Bob and Mary can add/edit files etc under /Data and no "you do not have permission" errors happen, which I believe was the Boss' main boggle. So it seems weird to me as security is totally out the window, but it practically works.



But this makes me terrified of when project finishes and project2 starts. This is 3 months away and i'm not sure how to handle this. I know he'll say "just chown -R project2:project2 /Data, reimage all machines to have that user, and move on", but i'm sure there's a better solution.



So i'm wondering from this setup how can I have unique users manage /Data without causing "you do not have permission" errors?



Additionally I'm wondering is there a kind of linux equivalent of "Active Directory" that can be setup to administrate users and groups (for projects) in the company? I've no idea how this problem is usually managed in the linux world.




And anything else I should consider?



Sorry if this is Linux 101 stuff but i'm not sure how it's typically managed and practically pulled off.

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