[DNSOP] ZONEMD was Re: [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt

Mark Andrews <marka@isc.org> Tue, 11 May 2021 00:45 UTC

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From: Mark Andrews <marka@isc.org>
In-Reply-To: <554EF35D-E06B-4F7B-9DDA-90DA8470F6F3@icann.org>
Date: Tue, 11 May 2021 10:44:57 +1000
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References: <F4CE48A1-7AB0-45D0-97FF-158CE3A04EE1@icann.org> <3EE971EE-0777-44D6-9CD2-771B92FFE938@hopcount.ca> <1d822219-8ab9-2cb7-d0a4-9b8afc39058d@powerdns.com> <2952D408-117B-40D0-B859-7A8E4111629E@hopcount.ca> <CAHbrMsD+uiaYQ8i58VRjF=3AtW9uAoAtgbKzNzrPZC3QCmD2pQ@mail.gmail.com> <25971B7D-718C-42E3-8F04-2D235776C66B@icann.org> <4312DB4B-A9E0-48E8-BD79-7358080065F4@isc.org> <554EF35D-E06B-4F7B-9DDA-90DA8470F6F3@icann.org>
To: Paul Hoffman <paul.hoffman@icann.org>
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Subject: [DNSOP] ZONEMD was Re: [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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> On 11 May 2021, at 09:20, Paul Hoffman <paul.hoffman@icann.org> wrote:
> On May 10, 2021, at 4:14 PM, Mark Andrews <marka@isc.org> wrote:
>> Actually, the process problem is that record format keeps changing AFTER the code point has been assigned and the record format THEORETICALLY been FIXED.
> Mark makes an excellent point, one that people in the DNS world routinely forget.

Just for reference ZONEMD switched two fields between draft-wessels-dns-zone-digest-05.txt and
RFC 8976.  "Digest Type | Reserved” -> "Scheme | Hash Algorithm”.  This resulted in BIND rejecting
zones with ZONEMD records using SHA-512 digests (digest field has the wrong length for Digest Type 1).
Renaming fields is fine.  Reordering/repurposing non reserved isn’t as it breaks stuff.  Now we are
making BIND compatible with RFC 8976 but we should never have been put in this position.

> --Paul Hoffman_______________________________________________
> DNSOP mailing list
> DNSOP@ietf.org
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka@isc.org