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Re: [Doh] Mozilla's plans re: DoH

<N.Leymann@telekom.de> Thu, 28 March 2019 09:04 UTC

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From: <N.Leymann@telekom.de>
To: <neil.cook@noware.co.uk>, <doh@ietf.org>
Thread-Topic: [Doh] Mozilla's plans re: DoH
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Date: Thu, 28 Mar 2019 09:03:41 +0000
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Subject: Re: [Doh] Mozilla's plans re: DoH
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Hi,

-----Ursprüngliche Nachricht-----
Von: Doh <doh-bounces@ietf.org> Im Auftrag von Neil Cook
Gesendet: Mittwoch, 27. März 2019 17:15
An: DoH WG <doh@ietf.org>
Betreff: Re: [Doh] Mozilla's plans re: DoH



>> On 27 Mar 2019, at 09:24, Eric Rescorla <ekr@rtfm.com> wrote:
>> 
>>Now with the numbered lists correctly formatted:
>>
>> I’ve heard a number of questions about Mozilla’s plans around DoH. 
>> We’ve made a number of public statements, but it might be useful to 
>> try to put this all in one place.
>> 
>> In context, the problem we are attempting to solve here is attack on 
>> the user’s name resolution from an attacker with full or partial 
>> control of the network, as contemplated by Section 3 of BCP 72 as well 
>> as BCP 188. There’s ample evidence of monitoring/manipulation of user 
>> traffic via this vector [0][1][2]. Importantly, this includes cases 
>> where the entity which owns the network infrastructure monitors and/or 
>> modifies DNS requests and responses without the user’s consent.
>> 
>
> But Mozilla doesn’t know whether the modification is with or without the user’s consent. As the various drafts that have been presented this week attempt to 
> make clear, there are a large number of use cases where users actively want the modification of their DNS (parental control, enterprise networks, 
> malware/phishing detection, botnet C&C communication disruption etc.), indeed they may even be paying for such a service.
That is a very valid assumption. And if they pay for the service they also expect that the service will work and does not break if they install a new client (browser/app/...) on their end systems. In most of the cases they even do not know were a functionality is implemented and they do not change default settings (which is fine, because "default" usually means that nothing will break). From my experience a new default disabling an existing feature (malware/phishing protection, DNS64, Load Balancing, ...) will lead to problems.

Regards

Nic

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