Re: [DNSOP] Robert Wilton's No Objection on draft-ietf-dnsop-dns-zone-digest-12: (with COMMENT)

"Rob Wilton (rwilton)" <rwilton@cisco.com> Thu, 15 October 2020 10:38 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: "Wessels, Duane" <dwessels=40verisign.com@dmarc.ietf.org>
CC: "draft-ietf-dnsop-dns-zone-digest@ietf.org" <draft-ietf-dnsop-dns-zone-digest@ietf.org>, Tim Wicinski <tjw.ietf@gmail.com>, "dnsop@ietf.org" <dnsop@ietf.org>, "dnsop-chairs@ietf.org" <dnsop-chairs@ietf.org>, The IESG <iesg@ietf.org>
Thread-Topic: Robert Wilton's No Objection on draft-ietf-dnsop-dns-zone-digest-12: (with COMMENT)
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Date: Thu, 15 Oct 2020 10:38:50 +0000
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Subject: Re: [DNSOP] Robert Wilton's No Objection on draft-ietf-dnsop-dns-zone-digest-12: (with COMMENT)
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Hi Duane,

That looks good.  Thanks for accommodating.

Regards,
Rob

> -----Original Message-----
> From: iesg <iesg-bounces@ietf.org> On Behalf Of Wessels, Duane
> Sent: 14 October 2020 13:35
> To: Rob Wilton (rwilton) <rwilton=40cisco.com@dmarc.ietf.org>
> Cc: draft-ietf-dnsop-dns-zone-digest@ietf.org; Tim Wicinski
> <tjw.ietf@gmail.com>om>; dnsop@ietf.org; dnsop-chairs@ietf.org; The IESG
> <iesg@ietf.org>
> Subject: Re: Robert Wilton's No Objection on draft-ietf-dnsop-dns-zone-
> digest-12: (with COMMENT)
> 
> 
> 
> > On Oct 12, 2020, at 8:56 AM, Rob Wilton (rwilton)
> <rwilton=40cisco.com@dmarc.ietf.org> wrote:
> >
> >
> >
> >>
> >>>
> >>>   2.  The ZONEMD Resource Record
> >>>
> >>>      It is
> >>>      RECOMMENDED that a zone include only one ZONEMD RR, unless the
> >> zone
> >>>      publisher is in the process of transitioning to a new Scheme or
> >> Hash
> >>>      Algorithm.
> >>>
> >>> I'm not quite sure how well this fits with sections 2.2.3 restriction
> >> that
> >>> SHA384 MUST be implemented, and SHA512 SHOULD be implemented.   As a
> >> recipient
> >>> of the zone info I understand that I would need to implement both, but
> >> as a
> >>> sender am I allowed to only send SHA512, or both, or must I always
> send
> >> SHA384?
> >>
> >> As sender (publisher) you are allowed to publish whatever you want.
> > [RW]
> >
> > Okay, taken in conjunction with 2.2.3 that didn't seem clear to me.  My
> reading is that the sender SHOULD only send one, and [everyone] MUST
> support SHA384, effectively implying that is SHA384 that MUST be sent ...
> Perhaps the RFC 2119 language in section 2.2.3 needs to be restricted to
> receivers processing ZONEMD records?  ... or some other way to convey the
> difference in requirements on algorithm implementation between senders and
> receivers.
> >
> 
> 
> Hi Rob,
> 
> To address this, here is what we suggest:
> 
> In sections 2.2.2 and 2.2.3, rather than saying "MUST/SHOULD be
> implemented" we'll say "MUST/SHOULD be supported by implementations."
> 
> The paragraph about multiple digests at the start of section 2 will be
> moved to this new section 2.5:
> 
> 2.5.  Including ZONEMD RRs in a Zone
> 
>    The zone operator chooses an appropriate hash algorithm and scheme,
>    and includes the calculated zone digest in the apex ZONEMD RRset.
>    The zone operator MAY choose any of the defined hash algorithms and
>    schemes, including the private use code points.
> 
>    The ZONEMD RRSet MAY contain multiple records to support algorithm
>    agility [RFC7696].  [RFC Editor: change that to BCP 201] When
>    multiple ZONEMD RRs are present, each MUST specify a unique Scheme
>    and Hash Algorithm tuple.  It is RECOMMENDED that a zone include only
>    one ZONEMD RR, unless the zone operator is in the process of
>    transitioning to a new scheme or hash algorithm.
> 
> 
> DW
> 
>