DNS server privacy policy with assertion token
draft-reddy-dprive-dprive-privacy-policy-00

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Last updated 2019-10-03
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DPRIVE WG                                                       T. Reddy
Internet-Draft                                                    McAfee
Intended status: Standards Track                                 D. Wing
Expires: April 5, 2020                                            Citrix
                                                           M. Richardson
                                                Sandelman Software Works
                                                         October 3, 2019

             DNS server privacy policy with assertion token
              draft-reddy-dprive-dprive-privacy-policy-00

Abstract

   Users want to control how their DNS queries are handled by DNS
   servers so they can configure their system to use DNS servers that
   comply with their privacy expectations.

   This document defines a mechanism for a DNS server to communicate its
   privacy policy to a DNS client.  This communication is
   cryptographically signed to attest to its authenticity.  By
   evaluating the DNS privacy policy and the signatory, the DNS client
   can choose a DNS server that best supports its desired privacy
   policies.  The privacy assertion token is particularly useful for
   DNS-over-TLS and DNS-over-HTTPS servers, both public resolvers and
   those discovered on the local network.

Status of This Memo

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

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

   This Internet-Draft will expire on April 5, 2020.

Reddy, et al.             Expires April 5, 2020                 [Page 1]
Internet-Draft     Asserted DNS server privacy policy       October 2019

Copyright Notice

   Copyright (c) 2019 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Privacy assertion token (PAT) overview  . . . . . . . . . . .   4
   4.  PAT Header  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  "typ" (Type) Header Parameter . . . . . . . . . . . . . .   5
     4.2.  "alg" (Algorithm) Header Parameter  . . . . . . . . . . .   5
     4.3.  "x5u" (X.509 URL) Header Parameter  . . . . . . . . . . .   6
     4.4.  Example PAT header  . . . . . . . . . . . . . . . . . . .   6
   5.  PAT Payload . . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  JWT defined claims  . . . . . . . . . . . . . . . . . . .   7
       5.1.1.  "iat" - Issued At claim . . . . . . . . . . . . . . .   7
       5.1.2.  "exp" - Expiration Time claim . . . . . . . . . . . .   7
     5.2.  PAT specific claims . . . . . . . . . . . . . . . . . . .   7
       5.2.1.  DNS server Identity Claims  . . . . . . . . . . . . .   7
       5.2.2.  "privinfo" (Privacy Information) Claim  . . . . . . .   8
       5.2.3.  Example . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  PAT Signature . . . . . . . . . . . . . . . . . . . . . . . .  11
   7.  Extending PAT . . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  Deterministic JSON Serialization  . . . . . . . . . . . . . .  12
     8.1.  Example PAT deterministic JSON form . . . . . . . . . . .  13
   9.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  13
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  14
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
     11.1.  Media Type Registration  . . . . . . . . . . . . . . . .  15
       11.1.1.  Media Type Registry Contents Additions Requested . .  15
     11.2.  JSON Web Token Claims Registration . . . . . . . . . . .  16
       11.2.1.  Registry Contents Additions Requested  . . . . . . .  16
     11.3.  DNS Resolver Information Registration  . . . . . . . . .  16
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  16
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