my question is not directly related to IPA, but since IPA provides underlying 
authentication services, I think it almost fits here.
I have an Apache WebDAV server that authenticates via Kerberos to IPA server.
Related configuration in Apache is:

AuthType                Kerberos
# Essential for Windows clients to connect
KrbMethodNegotiate      Off
KrbMethodK5Passwd       On
KrbAuthRealms           REALM
Krb5KeyTab              /etc/httpd/conf/krb5.keytab
KrbServiceName          HTTP
Require                 valid-user

I can login with IPA username (i.e. user) and user@REALM
But I also need to login with e-mail, as user@domain, which does not work.
“domain" equals “REALM", but, naturally, domain is lowercase and REALM is 

I could not find any simple solution so far. I thought I could manipulate 
username supplied by user and I tried to play with /etc/krb5.conf, by adding 
auth_to_local statements, as below:

  REALM = {
    pkinit_anchors = FILE:/etc/ipa/ca.crt
    # experimenting to convert to uppercase
    auth_to_local  = RULE:[1:$1@$0](^.*@domain$)s/@domain/@REALM/
    auth_to_local  = DEFAULT

But this doesn’t work and it seems that it is not even tried by Apache/Kerberos.

Could you suggest any other solution if this is possible to achieve at all?
One other way that might work is via Apache module mod_map_user, but I could 
not compile it on Centos7.

Thanks for you time and kind regards,

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