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

Neil Cook <neil.cook@noware.co.uk> Tue, 12 March 2019 16:13 UTC

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From: Neil Cook <neil.cook@noware.co.uk>
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Date: Tue, 12 Mar 2019 17:13:23 +0100
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Cc: nalini elkins <nalini.elkins@e-dco.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>, doh@ietf.org, dnsop@ietf.org, Christian Huitema <huitema@huitema.net>, dns-privacy@ietf.org, Vittorio Bertola <vittorio.bertola=40open-xchange.com@dmarc.ietf.org>, "Ackermann, Michael" <mackermann@bcbsm.com>
To: Stephane Bortzmeyer <bortzmeyer@nic.fr>
References: <1700920918.12557.1552229700654@appsuite.open-xchange.com> <7667c4d7-2e78-0a27-84af-cf1c00fd4897@cs.tcd.ie> <1991054337.12802.1552259263075@appsuite.open-xchange.com> <eea64b30-aad0-a030-5360-1b1484f1d0e3@huitema.net> <CAPsNn2WhjHSEHJUEL8GB6X0d24fkajgPnY4YgkOQbXjyxb5q8Q@mail.gmail.com> <20190312153636.qdsdne24vmi4xdoe@nic.fr> <50BAF399-B95D-438B-B3FC-05A0159439E2@noware.co.uk> <20190312160141.ibnjtdt5myntwiwk@nic.fr>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dns-privacy/khzhJyTxRpzf-Li41I6UB1j0cEE>
Subject: Re: [dns-privacy] [Doh] New: draft-bertola-bcp-doh-clients
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> On 12 Mar 2019, at 17:01, Stephane Bortzmeyer <bortzmeyer@nic.fr> wrote:
> 
> On Tue, Mar 12, 2019 at 04:55:11PM +0100,
> Neil Cook <neil.cook@noware.co.uk> wrote 
> a message of 22 lines which said:
> 
>> Actually many enterprises (particularly banks etc.) do not allow DNS resolution directly from employee endpoints.
> 
> They block UDP/53, which is not the same thing. Malware or
> non-cooperating applications can do name resolution by other means. I
> still do not understand why people have a problem with DoH whch did
> not already exist before with
> my-own-name-resolution-protocol-over-HTTPS.

Sure, but the malware has to go to a specific server which can be identified and blocked. For any companies implementing a “whitelist-only” security-policy, this is straightforward. Even without, these kinds of requests can be spotted as anomalies etc.

This is a different scenario then a DoH server co-located with e.g. youtube.com <http://youtube.com/> or whatever, which is a little harder to block (by design as P. Vixie has pointed out).

Neil

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