From 5a084994144704a6c146b94f8a22cf57ce08deab Mon Sep 17 00:00:00 2001
From: Alexander Bokovoy <ab@samba.org>
Date: Mon, 7 Oct 2019 18:24:28 +0300
Subject: [PATCH] samba-tool: create working private krb5.conf

DNS update tool uses private krb5.conf which should have enough details
to authenticate with GSS-TSIG when running nsupdate.

Unfortunately, the configuration we provide is not enough. We set
defaults to not lookup REALM via DNS but at the same time we don't
provide any realm definition. As result, MIT Kerberos cannot actually
find a working realm for Samba AD deployment because it cannot query DNS
for a realm discovery or pick it up from the configuration.

Extend private krb5.conf with a realm definition that will allow MIT
Kerberos to look up KDC over DNS.

Signed-off-by: Alexander Bokovoy <ab@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
---
 source4/setup/krb5.conf | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/source4/setup/krb5.conf b/source4/setup/krb5.conf
index b1bf6cf907d..ad6f2818fb5 100644
--- a/source4/setup/krb5.conf
+++ b/source4/setup/krb5.conf
@@ -2,3 +2,11 @@
 	default_realm = ${REALM}
 	dns_lookup_realm = false
 	dns_lookup_kdc = true
+
+[realms]
+${REALM} = {
+	default_domain = ${DNSDOMAIN}
+}
+
+[domain_realm]
+	${HOSTNAME} = ${REALM}
-- 
2.21.0