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Re: [DNSOP] Comments on draft-wessels-dns-zone-digest-02

Paul Wouters <paul@nohats.ca> Mon, 20 August 2018 14:57 UTC

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Date: Mon, 20 Aug 2018 10:57:36 -0400
From: Paul Wouters <paul@nohats.ca>
To: Shumon Huque <shuque@gmail.com>
cc: Bob Harold <rharolde@umich.edu>, "dnsop@ietf.org WG" <dnsop@ietf.org>, Brian Dickson <brian.peter.dickson@gmail.com>
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Subject: Re: [DNSOP] Comments on draft-wessels-dns-zone-digest-02
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On Mon, 20 Aug 2018, Shumon Huque wrote:

> On Sun, Aug 19, 2018 at 3:29 PM Paul Wouters <paul@nohats.ca> wrote:
>
>       When using DNSSEC, the resolver should follow the glue and then perform
>       a query at the child zone to confirm the glue data. In unbound.conf
>       terms this is called harden-glue: yes
> 
> 
> I had not thought of this, thanks for mentioning it.  So if I transfer a copy of the root (or other zone), I can verify the signed parts with DNSSEC, and
> the glue by resolving them and verifying from the child zone.  Does that leave any unverified records (are glue the only unsigned records)?
> Note that the child might have different records than the parent glue, so my copy of the zone might end up different in that regard - is that ok?
> 
> This scheme won't work because in the general case glue records for signed zones may live in unsigned zones and thus may not be validatable at all. See glue
> for .COM, .NET, .ORG etc for prominent examples.

Those zones would have a signed ZONEMD but no DS record leading to a
validated path anyway, so those are lost without an external (from
DNSSEC) PKI which falls very far outside the scope of ZONEMD.

Paul

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