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

Viktor Dukhovni <ietf-dane@dukhovni.org> Fri, 10 August 2018 00:21 UTC

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Date: Thu, 09 Aug 2018 20:21:52 -0400
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Subject: Re: [DNSOP] Comments on draft-wessels-dns-zone-digest-02
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On Thu, Aug 09, 2018 at 02:19:08PM +0000, Edward Lewis wrote:

> FWIW, this message was spurred by this comic strip [yes, today as I write]: http://dilbert.com/strip/2018-08-09.

Cute.

> "Will the time taken to generate and verify this record add to the security of a zone transfer?"

Perhaps a sensible way to secure zone transfer is at the transport
layer.  Presumably DNS over TLS is comaptible with AXFR.  If desired
authentication can be via DANE.  Just publish a TLSA RRset:

	example.net. IN SOA nsa.example.net. hostmaster.example.net. ...
	example.net. IN NS nsa.example.net.
	nsa.example.net. IN A 192.0.2.1
	_853._tcp.nsa.example.net. IN TLSA 3 1 1 fbefbd9e5b54696792bab92cf329669edaca16d0b09dcfdd16fe3e1bd8ab08e9

and do the AXFR transfer over TLS.  This does not require pre-computation
of a zone checksum.  Just obtain the zone transfer from a suitably
trusted source.

-- 
	Viktor.

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