s4:auth: use the correct client realm in gensec_gssapi_update_internal()
The function gensec_gssapi_client_creds() may call kinit and gets
a TGT for the user. The principal provided by the user may not
be canonicalized. The user may use 'given.last@example.com'
but that may be mapped to glast@AD.EXAMPLE.PRIVATE in the background.
It means we should use client_realm = AD.EXAMPLE.PRIVATE
instead of client_realm = EXAMPLE.COM
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14124
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>
(cherry picked from commit
db8fd3d6a315b140ebd6ccd0dcdfdcf27cd1bb38)