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Authelia is popular, as is Keycloak. I believe Red Hat develops Keycloak or at least has a hand in it.
I'm on this journey as well, figuring out what I'm going to use. Currently most of my services just use LDAP back to AD but I'm looking to do something more modern like SAML, oAuth or OpenID Connect so that I can simplify the number of MFA tokens I have.
Just as an anecdote you may find useful - Personally I used to run an Active Directory for Windows and FreeIPA for my Linux machines and have managed to simplify this to just AD. Linux machines can be joined, you can still use sudo and all the other good stuff while only having one source of truth for identity.
I am aware that linux devices can join the AD domain. The reasons i setup up FreeIPA/IDM is the linux specific rules I can make. Like the Sudo rules for example. As far as i am aware you can not do this with a windows domain controller.
Depends on your use case, but you can use some Group Policy Objects on Linux (at least with sssd). See: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/windows_integration_guide/sssd-gpo
You can also grant sudo to AD group members in the sudoers file, which is how I've done it in a corporate setting.
I believe there are 3rd party ADMX templates you can add to your domain controllers to get more granular as well as additions to the AD schema, but I haven't gone that deep with it since between sssd and the sudoers file I can achieve what I need to.
Arnt GPOs on Linux very limited? Anyway to get some form of "policys" working I was thinking of using Ansible and playbooks to manage that portion anyway. (Next project).
Keycloak = XML pain.
Haven't come across any xml during my deployment so far
Looking for a good guide on getting this setup via docker and AD LDAP, any pointers?