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Re: [Add] [Ext] Draft Posting: CNAME Discovery of Local DoH Resolvers

Eric Rescorla <ekr@rtfm.com> Tue, 30 June 2020 03:08 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Mon, 29 Jun 2020 20:08:02 -0700
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To: Daniel Migault <mglt.ietf@gmail.com>
Cc: Paul Vixie <paul@redbarn.org>, Michael Richardson <mcr+ietf@sandelman.ca>, ADD Mailing list <add@ietf.org>, John R Levine <johnl@taugh.com>
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Subject: Re: [Add] [Ext] Draft Posting: CNAME Discovery of Local DoH Resolvers
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On Mon, Jun 29, 2020 at 8:05 PM Daniel Migault <mglt.ietf@gmail.com> wrote:

> If the lookup takes as input the IP addresses or something provided by the
> ISP (like the local resolver IP address), the resulting chain is likely to
> be from the ISP. DNSSEC is needed to assert it.
>

Why do you assume that the IP is delivered securely?


Another way would be to be able to display example.com. The user should be
> able to see how the domain is associated to the ISP it has subscribed to or
> if it is being redirected to a cloud provider.  DNSSEC would make sur
> the corresponding IP address - as well as other information - are bound to
> the displayed domain.
>

At this point, why would I need DNSSEC? I could just use the WebPKI.

-Ekr


>> I could of course be wrong about this. If you believe I am, I would
>> encourage you to describe the entire discovery chain and where you believe
>> DNSSEC acts to prevent attack.
>>
>> -Ekr
>>
>>
>
> --
> Daniel Migault
> Ericsson
>

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