Oblivious DNS Over HTTPS
draft-pauly-dprive-oblivious-doh-02

Document Type Active Internet-Draft (individual)
Authors Eric Kinnear  , Patrick McManus  , Tommy Pauly  , Christopher Wood 
Last updated 2020-10-09
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Network Working Group                                         E. Kinnear
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                              P. McManus
Expires: 12 April 2021                                            Fastly
                                                                T. Pauly
                                                              Apple Inc.
                                                               C.A. Wood
                                                              Cloudflare
                                                          9 October 2020

                        Oblivious DNS Over HTTPS
                  draft-pauly-dprive-oblivious-doh-02

Abstract

   This document describes an extension to DNS Over HTTPS (DoH) that
   allows hiding client IP addresses via proxying encrypted DNS
   transactions.  This improves privacy of DNS operations by not
   allowing any one server entity to be aware of both the client IP
   address and the content of DNS queries and answers.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 12 April 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights

Kinnear, et al.           Expires 12 April 2021                 [Page 1]
Internet-Draft                Oblivious DoH                 October 2020

   and restrictions with respect to this document.  Code Components
   extracted from this document must include Simplified BSD License text
   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Specification of Requirements . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Deployment Requirements . . . . . . . . . . . . . . . . . . .   3
   4.  HTTP Exchange . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  HTTP Request  . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  HTTP Request Example  . . . . . . . . . . . . . . . . . .   5
     4.3.  HTTP Response . . . . . . . . . . . . . . . . . . . . . .   6
     4.4.  HTTP Response Example . . . . . . . . . . . . . . . . . .   6
   5.  Configuration and Public Key Discovery  . . . . . . . . . . .   6
   6.  Configuration and Public Key Format . . . . . . . . . . . . .   7
   7.  Protocol Encoding . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Message Format  . . . . . . . . . . . . . . . . . . . . .   8
     7.2.  Encryption and Decryption Routines  . . . . . . . . . . .   9
   8.  Oblivious Client Behavior . . . . . . . . . . . . . . . . . .  11
   9.  Oblivious Target Behavior . . . . . . . . . . . . . . . . . .  11
   10. Compliance Requirements . . . . . . . . . . . . . . . . . . .  12
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  12
     11.1.  Denial of Service  . . . . . . . . . . . . . . . . . . .  14
     11.2.  General Proxy Services . . . . . . . . . . . . . . . . .  14
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
     12.1.  Oblivious DoH Message Media Type . . . . . . . . . . . .  14
     12.2.  Oblivious DoH Public Key DNS Parameter . . . . . . . . .  15
   13. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  16
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     14.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     14.2.  Informative References . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   DNS Over HTTPS (DoH) [RFC8484] defines a mechanism to allow DNS
   messages to be transmitted in encrypted HTTP messages.  This provides
   improved confidentiality and authentication for DNS interactions in
   various circumstances.

   While DoH can prevent eavesdroppers from directly reading the
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