GSS-TSIG update-policy clarification

[Mark Andrews]

This was noted in the release notes and in CHANGES.

4885.   [security]      update-policy rules that otherwise ignore the name
                        field now require that it be set to "." to ensure
                        that any type list present is properly interpreted.
                        [RT #47126]

krb5-subdomain gets the permitted names from the Kerberos credential name
(host/machine at REALM).

> On 23 Mar 2018, at 2:50 am, Nicholas Miller <Nicholas.Miller at Colorado.EDU> wrote:
> 
> With the latest update to bind our named.conf started reporting errors. I have figured it out but wanted to get clarification about the syntax.
> 
> We had been using:
> 
> 	deny DOMAIN.EDU krb5-subdomain DOMAIN.EDU CNAME MX SRV TXT;
> 
> We are now using:
> 
> 	deny DOMAIN.EDU krb5-subdomain . CNAME MX SRV TXT;
> 
> Am I to assume that the ‘.’ in the config statement behaves similarly to the ‘.’ in a zone file? It refers back to the zone the update-policy is defining?
> 
> Also, what is the difference between using a ‘.’ and a ‘*’? They both refer to all records within the zone.:
> 
> 	deny DOMAIN.EDU krb5-subdomain * MX SRV TXT;
> 
> _________________________________________________________
> Nicholas Miller, OIT, University of Colorado at Boulder
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org