Re: [DNSOP] [dns-privacy] New: draft-bertola-bcp-doh-clients

Stephen Farrell <stephen.farrell@cs.tcd.ie> Tue, 12 March 2019 00:00 UTC

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To: Paul Vixie <paul@redbarn.org>, "doh@ietf.org" <doh@ietf.org>
Cc: nalini elkins <nalini.elkins@e-dco.com>, "Konda, Tirumaleswar Reddy" <TirumaleswarReddy_Konda@mcafee.com>, "dnsop@ietf.org" <dnsop@ietf.org>, "Ackermann, Michael" <mackermann@bcbsm.com>, Christian Huitema <huitema@huitema.net>, "dns-privacy@ietf.org" <dns-privacy@ietf.org>, Vittorio Bertola <vittorio.bertola=40open-xchange.com@dmarc.ietf.org>
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Date: Tue, 12 Mar 2019 00:00:13 +0000
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Subject: Re: [DNSOP] [dns-privacy] New: draft-bertola-bcp-doh-clients
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(This distribution list is too scattered and diverse. Be
great if some AD or someone just picked one list for this.
In the meantime...)

On 11/03/2019 20:43, nalini elkins wrote:
>  impact assessment that certain changes such as
> DoH and TLS1.3 will have on enterprises,

TLS1.3 will, I expect, noticeably improve security for an awful
lot of enterprises in time.

As for DoH, I wonder has anyone done studies on how split-horizon
names and access patterns leak today?

I don't recall having read that kind of study. I can imagine
many ways in which that kind of stuff would leak. I'd be very
surprised if it never happens. I don't know how often it does.

For names, leaking once is kinda fatal. For access patterns,
I guess one leak exposes an IP address that's interested in a
name (e.g. secret-project.example.com) but more would be
needed for broader access patterns to be exposed to "foreign"
recursives and/or in-band networks.

ISTM that it is quite possible that enterprises that deploy their
own DoH services could potentially reduce such leakage and gain
overall. (I'm assuming here that sensible browser-makers will
end up providing something that works for browsers running in
networks with split-horizon setups before those browsers turn
on DoH as a default at scale.)

Cheers,
S.