Manila driver issues kerberos-config-info API against SVM management LIF

[Jonathan Williams]

We've found an additional issue that is not addressed in https://bugs.launchpad.net/manila/+bug/2069125

In this issue, when creating access for a share, the following behavior is seen with a SVM scoped user.

1. A net-interface-get-iter call is issued to ONTAP. This fetches both data LIFs and the management LIF

2. If the SVM management LIF is at the top of the returned net-interface-get-iter list, Manila will select that management LIF and run kerberos-config-get-iter against it. From that, Manila will deduce that Kerberos is *not* enabled which could be incorrect.

A management LIF will not have a Kerberos configuration. A Data LIF might have Kerberos enabled.

An example of the kerberos-config-get-iter response when issued against a data LIF...versus when issued against a management LIF (which returns a null response):

data lif:

<?xml version='1.0' encoding='UTF-8' ?>
<netapp version='1.221' xmlns='http://www.netapp.com/filer/admin'>

    <!-- Output of kerberos-config-get-iter [Execution Time: 56 ms] -->
     <results status='passed'>
          <attributes-list>
               <kerberos-config-info>
                    <interface-name>manila-nfs-data-01</interface-name>
                    <is-kerberos-enabled>true</is-kerberos-enabled>
                    <vserver>demo-manila-svm</vserver>
               </kerberos-config-info>
          </attributes-list>
          <num-records>1</num-records>
     </results>
</netapp>

mgmt lif:

<?xml version='1.0' encoding='UTF-8' ?>
<netapp version='1.221' xmlns='http://www.netapp.com/filer/admin'>

    <!-- Output of kerberos-config-get-iter [Execution Time: 48 ms] -->
     <results status='passed'>
          <num-records>0</num-records>
     </results>
</netapp>

There needs to be some logic in place so that the kerberos-config-get-iter check is only issued against data LIFS. Never against SVM management LIFs.

[Vida Haririan (vhariria)]

See additional triage information at https://meetings.opendev.org/meetings/manila/2024/manila.2024-07-25-15.00.log.html