I want to secure some git repositories and using only users and groups is not sufficient.
I'm thinking about using ACLs to control the access.
The access to the repositories is local, the users have shell access.
Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up.Sign up to join this community
You should check out AIX acls.
Reflecting the comment on the previous, ACLs might indeed be the way to go. It's fairly easy either to grant users access individually, or to give the group access and block certain users. The tutorial here may be useful.