EAP-MSCHAPv2 and AD Authentication w/o ntlm_auth

[BOUILLOUD Corentin]

Hi everyone, nice to meet you,

I would like to use Kerberos instead of ntlm_auth to authenticate AD users with FreeRADIUS.
I configured 'mschap' module to directly use winbind daemon directly and, If I understood samba documentation properly,
winbindd can't authenticate users himself. It uses 'pam_winbind' module that we can configure to use Kerberos.
Could you confirm me that it is correct and/or possible in another way ?

mods-enabled/mschap
        #
        #  An alternative to using ntlm_auth is to connect to the
        #  winbind daemon directly for authentication. This option
        #  is likely to be faster and may be useful on busy systems,
        #  but is less well tested.
        #
        #  Using this option requires libwbclient from Samba 4.2.1
        #  or later to be installed. Make sure that ntlm_auth above is
        #  commented out.
        #
         winbind_username = "%{mschap:User-Name}"
         winbind_domain = "%{mschap:NT-Domain}"

https://www.samba.org/samba/docs/current/man-html/winbindd.8.html
The service provided by winbindd is called `winbind' and can be used to resolve user and group information from a Windows NT server.
The service can also provide authentication services via an associated PAM module.

https://www.samba.org/samba/docs/current/man-html/pam_winbind.8.html
krb5_auth
    pam_winbind can authenticate using Kerberos when winbindd is talking to an Active Directory domain controller.
    Kerberos authentication must be enabled with this parameter.


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