Re: [Add] Fwd: New Version Notification for draft-reddy-add-server-policy-selection-02.txt

tirumal reddy <> Mon, 01 June 2020 10:22 UTC

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From: tirumal reddy <>
Date: Mon, 1 Jun 2020 15:52:36 +0530
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To: Vittorio Bertola <>
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Subject: Re: [Add] Fwd: New Version Notification for draft-reddy-add-server-policy-selection-02.txt
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Please see inline

On Thu, 28 May 2020 at 20:02, Vittorio Bertola <> wrote:

> Il 28/05/2020 12:19 tirumal reddy <> ha scritto:
> Hi all,
> We prepared an updated version of
> to
> address comments from Neil. It discusses how a DNS client can authenticate
> it is connecting to a DoH/DoT server hosted by a specific organization
> (e.g., ISP). We now rely on I-D.pp-add-resinfo to retrieve the Policy
> Assertion Token (PAT).
> Comments are welcome.
> Thanks for this work. I think we need feedback by client developers that
> would consume this information. You might need something more detailed or
> specific to express the server's policies; for example, machine-readable
> indication of authentication support, logging policies, or fine-grained
> description of filtering policies could be used by clients that want to
> standardize their analysis and presentation of server features. It's good
> to have an extension mechanism, but there would still be the need for
> agreement on what the new claims mean.

The attributes defined in the draft do not convey any “privacy claims” like
logging policies. We don’t want to compete/replace the privacy statements
written by an attorney and create any ambiguity or under-represent the
legal statements. The attributes identify the capabilities of the DoH
server (e.g., malware filtering) and the attribute privacyurl provides a
URL that points to the human readable privacy policy statement.

The main purpose of this draft is to discuss how a DNS client can
cryptographically identify it is connecting to a DoT/DoH server hosted by a
specific organization (e.g., ISP).  It is particularly useful when the
DoH/DoT server is insecurely discovered and prevents the client from
connecting to a attackers server.

Can you please provide more details on what you mean by machine-readable
authentication support and what kind of fine-grained description of
filtering policies should be conveyed to the client ?


> --
> Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
> Office @ Via Treviso 12, 10144 Torino, Italy