Re: [DNSOP] Working Group Last Call for draft-ietf-dnsop-rfc7816bis

Viktor Dukhovni <ietf-dane@dukhovni.org> Wed, 28 October 2020 19:16 UTC

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Date: Wed, 28 Oct 2020 15:16:19 -0400
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
To: dnsop <dnsop@ietf.org>
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Subject: Re: [DNSOP] Working Group Last Call for draft-ietf-dnsop-rfc7816bis
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On Tue, Oct 27, 2020 at 08:31:29PM -0400, Tim Wicinski wrote:

> This starts a Working Group Last Call for draft-ietf-dnsop-rfc7816bis
> 
> Current versions of the draft is available here:
> https://datatracker.ietf.org/doc/draft-ietf-dnsop-rfc7816bis/
> 
> The Current Intended Status of this document is: "Standards Track"

A potential improvement to the algorithm that's not mentioned in the
draft is avoiding probing for zone cuts at non-LDH A-labels, e.g.
labels starting with "_" used in SRV records, DANE, ...

Such labels should rarely represent privacy-relevant administrative
boundaries, and e.g. with DANE and sometimes flawed support for
denial of existence, probes for "_tcp.example.com" sometimes return
invalid NXDomain proofs (poor handling of ENTs, missing wildcards
from NSEC chains, ...).

Therefore, it is best to avoid breaking the queue name below special-use
labels (_tcp, ...).  After asking for "smtp.example.com", ask for
"_25._tcp.smtp.example.com" and not "_tcp.smtp.example.com" followed
by "_25._tcp.smtp.example.com".

-- 
    Viktor.