DNS Server Privacy Statement and Filtering Policy with Assertion Token
draft-reddy-dprive-dprive-privacy-policy-02

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Last updated 2020-01-17
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DPRIVE WG                                                       T. Reddy
Internet-Draft                                                    McAfee
Intended status: Standards Track                                 D. Wing
Expires: July 20, 2020                                            Citrix
                                                           M. Richardson
                                                Sandelman Software Works
                                                        January 17, 2020

 DNS Server Privacy Statement and Filtering Policy with Assertion Token
              draft-reddy-dprive-dprive-privacy-policy-02

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 and DNS filtering expectations.

   This document defines a mechanism for a DNS server to communicate its
   privacy statement URL and filtering policy to a DNS client.  This
   communication is cryptographically signed to attest to its
   authenticity.  By evaluating the DNS privacy statement, filtering
   policy and the signatory, the user can choose a DNS server that best
   supports their desired privacy and filtering policy.  This token is
   particularly useful for DNS-over-TLS and DNS-over-HTTPS servers that
   are either public resolvers or are 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.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on July 20, 2020.

Reddy, et al.             Expires July 20, 2020                 [Page 1]
Internet-Draft         DNS Server Filtering Policy          January 2020

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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Use Cases Overview  . . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Policy assertion token (PAT) overview . . . . . . . . . . . .   5
   5.  PAT Header  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  'typ' (Type) Header Parameter . . . . . . . . . . . . . .   6
     5.2.  'alg' (Algorithm) Header Parameter  . . . . . . . . . . .   6
     5.3.  'x5u' (X.509 URL) Header Parameter  . . . . . . . . . . .   6
     5.4.  Example PAT header  . . . . . . . . . . . . . . . . . . .   7
   6.  PAT Payload . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  JWT defined claims  . . . . . . . . . . . . . . . . . . .   7
       6.1.1.  'iat' - Issued At claim . . . . . . . . . . . . . . .   7
       6.1.2.  'exp' - Expiration Time claim . . . . . . . . . . . .   7
     6.2.  PAT specific claims . . . . . . . . . . . . . . . . . . .   8
       6.2.1.  DNS server Identity Claims  . . . . . . . . . . . . .   8
       6.2.2.  'policyinfo' (Policy Information) Claim . . . . . . .   8
       6.2.3.  Example . . . . . . . . . . . . . . . . . . . . . . .   9
   7.  PAT Signature . . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  Extending PAT . . . . . . . . . . . . . . . . . . . . . . . .  10
   9.  Deterministic JSON Serialization  . . . . . . . . . . . . . .  10
     9.1.  Example PAT deterministic JSON form . . . . . . . . . . .  11
   10. Privacy Considerations  . . . . . . . . . . . . . . . . . . .  12
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  12
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     12.1.  Media Type Registration  . . . . . . . . . . . . . . . .  12
       12.1.1.  Media Type Registry Contents Additions Requested . .  13
     12.2.  JSON Web Token Claims Registration . . . . . . . . . . .  14
       12.2.1.  Registry Contents Additions Requested  . . . . . . .  14
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