On (22/02/20 09:52), Spike White wrote:

All,

When I was first crafting my sssd.conf file, I very much attempted to make all my sssd domains upper-case. Because in my (naive) view, an AD domain is just a Kerberos realm (+ LDAP + nice admin screens).

As you know, Kerberos is very much case-sensitive. (Technically, AD is not. but the convention in the /etc/krb5.conf file is to always put Kerberos realms in upper case).

Back to sssd.

When sssd auto-discovered the other parent and child domains, it discovered them in lower case. I was left with a mix of upper and lower-case sssd domains. Even worse, the one local AD domain showed up twice. Once in upper-case (explicitly defined in sssd.conf) and once in lower-case (auto-discovered).

Eventually, I gave up and went with the (apparently recommended sssd) convention of lower-case sssd domain names. In the domain definition, I list the krb5_realm in upper case:

[domain/amer.example.com] ... krb5_realm = AMER.EXAMPLE.COM

This is extremely unimportant (lower case works). But is there an option to auto-discover sssd domains in upper case?

SSSD domain is not the same as kerberos realm name. Usually, tools like ipa-client-install and realmd generate lower-case version of krb5 realm because it is simpler :-) But you could use any name for sssd.

e.g.

[domain/at_work] ... krb5_realm = AMER.EXAMPLE.COM

[domain/at_fedora] ... krb5_realm = FEDORAPROJECT.ORG

[domain/home] ... krb5_realm = MYAD.TEST.NET

User "johny@at_work" will get a krb5 ticket with principal johny@AMER.EXAMPLE.COM

Some domains (usually AD) have enabled option "case_sensitive = true" in domain section (by default with id_provider ad)

Therefore getent passwd johny@at_work and johny@AT_WORK will return the same ID. But getent passwd johny@AMER.EXAMPLE.COM will not return anything because such sssd domain does not exist :-)

And vice versa, kinit johny@AMER.EXAMPLE.COM will work but kinit johny@AT_WORK will not work.

HTH

LS