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

Ben Schwartz <bemasc@google.com> Thu, 20 May 2021 01:35 UTC

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From: Ben Schwartz <bemasc@google.com>
Date: Wed, 19 May 2021 18:35:04 -0700
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To: Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org>
Cc: Erik Nygren <erik+ietf@nygren.org>, dnsop <dnsop@ietf.org>, John Levine <johnl@taugh.com>, Brian Dickson <brian.peter.dickson@gmail.com>, Eric Orth <ericorth@google.com>, Joe Abley <jabley@hopcount.ca>
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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On Wed, May 19, 2021 at 7:49 AM Tommy Pauly <tpauly=
40apple.com@dmarc.ietf.org> wrote:

> I like Erik’s suggestion that we solve the issues with parsing by putting
> more rules and constraints of the set of available characters, etc.
>

I don't get the impression that the TLS working group is likely to reach a
consensus to formally restrict the allowed characters in ALPN values.
However, there are currently no "problematic characters" in any of the
registered ALPN values, and it seems very likely to me that there never
will be.  With that gray area in mind, I have attempted to thread the
needle with the following proposed change:
https://github.com/MikeBishop/dns-alt-svc/pull/325/files.  The key sentence
is:

> 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.

I'm sure this is no one's favorite option, but perhaps it is good enough to
enable us to move forward.