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Re: [Add] [EXTERNAL] My single use case

Andrew Campling <andrew.campling@419.consulting> Mon, 14 September 2020 17:06 UTC

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From: Andrew Campling <andrew.campling@419.consulting>
To: Vittorio Bertola <vittorio.bertola@open-xchange.com>, Daniel Migault <mglt.ietf@gmail.com>
CC: "add@ietf.org" <add@ietf.org>
Thread-Topic: [Add] [EXTERNAL] My single use case
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Date: Mon, 14 Sep 2020 17:06:08 +0000
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Subject: Re: [Add] [EXTERNAL] My single use case
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On 14/09/2020 17:56 Vittorio Bertola <vittorio.bertola@open-xchange.com> wrote:

> For the use case of "same-provider auto-upgrade" as currently implemented, being sure that a given
> DoH resolver really corresponds to the currently active Do53 system resolver would suffice, even if
> you were not able to authenticate who is actually operating those two resolvers. (This is different
> from "same-provider auto-upgrade only for selected trusted providers", which requires a hardcoded
> list of trusted providers in the client, but as far as I understand the objective is to get rid of
> hardcoded lists altogether.)
>
> For this purpose, we could simply use a TLSA record. The Do53 resolver would provide a TLSA record
> together with the RESINFO/TXT/whatever response to the discovery query, and when establishing
> the DoH connection, the client would validate the certificate against the TLSA record. If you add
> DNSSEC to the Do53 communication, this should be a secure process. Could this work?

This seems like a reasonable proposal, especially with the addition of DNSSEC.

Andrew

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