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

Mark Andrews <marka@isc.org> Thu, 20 May 2021 02:14 UTC

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From: Mark Andrews <marka@isc.org>
In-Reply-To: <a1ab90af-91b6-92ac-b4e-dda859fc7de0@nohats.ca>
Date: Thu, 20 May 2021 12:14:47 +1000
Cc: Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>, dnsop <dnsop@ietf.org>
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To: Paul Wouters <paul@nohats.ca>
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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> On 20 May 2021, at 11:52, Paul Wouters <paul@nohats.ca> wrote:
> 
> On Wed, 19 May 2021, Ben Schwartz wrote:
> 
>> So long as there are no registered protocol identifiers containing "," or "\\", zone file implementations MAY
>> disallow these characters instead of implementing the `value-list` escaping procedure.
> 
> Sorry, an implementor cannot predict the future of the IANA registry. They
> can't write code to confirm to this requirement other than NOT allowing
> the MAY.
> 
> Even if they were silly enough to _first_ check the IANA registry before
> parsing SVCB records, they would still have to write all the the parsing
> code without CVE's for both cases, just in case the IANA registry would
> gain these characters in the future.

Or detect them and switch to key1=“…” instead of alpn=“…” when displaying
entry would need to be using keyXXXX format until the software was upgraded.

alpn=“h1\\,h2,h3” (or alpn=“h1\,h2,h3” I’m not sure where the consensus lies)
vs key1=“\005h1,h2\002h3"

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