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Re: [dns-privacy] Registry framework for draft-ietf-dprive-early-data

Ben Schwartz <bemasc@google.com> Thu, 30 July 2020 02:14 UTC

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From: Ben Schwartz <bemasc@google.com>
Date: Wed, 29 Jul 2020 22:13:59 -0400
Message-ID: <CAHbrMsCr3yEvK6SJUvOtoLGiWxjNn4EwzoEYjNSku=8KC4-HGg@mail.gmail.com>
To: Tony Finch <dot@dotat.at>
Cc: Ilari Liusvaara <ilariliusvaara@welho.com>, "dns-privacy@ietf.org" <dns-privacy@ietf.org>, Alessandro Ghedini <alessandro@ghedini.me>
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Subject: Re: [dns-privacy] Registry framework for draft-ietf-dprive-early-data
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On Wed, Jul 29, 2020 at 9:58 PM Tony Finch <dot@dotat.at> wrote:

> Ilari Liusvaara <ilariliusvaara@welho.com> wrote:
> >
> > Then there is RRSIG, which seems bit alarming. While direct queries
> > should not do anything special, I noticed two troublesome properties:
> >
> > 1) The answers can be pretty large (amplification hazard with UDP).
> > 2) The queries can be really slow compared to other types.
>
> Yes. From an implementation perspective, RRSIG queries work in a very
> similar way to ANY queries. They have the advantage that no-one is likely
> to think an RRSIG query is useful, so it's reasonable to NOTIMP them.
> If QTYPE=ANY is forbidden for early data then QTYPE=RRSIG should be too.
>

I don't see the connection with early data.  TLS 1.3 early data is
address-validated (no amplification-reflection), and slowness seems
entirely orthogonal.

Tony.
> --
> f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
> Plymouth: Variable 4 or less, becoming east 3 to 5 for a time. Smooth or
> slight becoming slight or moderate. Fair. Good.
>
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