DNS Server Selection: DNS Server Information with Assertion Token
draft-reddy-add-server-policy-selection-05

Document Type Active Internet-Draft (individual)
Authors Tirumaleswar Reddy.K  , Dan Wing  , Michael Richardson  , Mohamed Boucadair 
Last updated 2020-08-31
Replaces draft-reddy-dprive-dprive-privacy-policy
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ADD WG                                                          T. Reddy
Internet-Draft                                                    McAfee
Intended status: Standards Track                                 D. Wing
Expires: March 4, 2021                                            Citrix
                                                           M. Richardson
                                                Sandelman Software Works
                                                            M. Boucadair
                                                                  Orange
                                                         August 31, 2020

   DNS Server Selection: DNS Server Information with Assertion Token
               draft-reddy-add-server-policy-selection-05

Abstract

   The document defines a mechanism that allows communication of DNS
   resolver information to DNS clients for use in server selection
   decisions.  In particular, the document defines a mechanism for a DNS
   server to communicate its filtering policy and privacy statement URL
   to DNS clients.  This information is cryptographically signed to
   attest its authenticity.  Such information is used for the selection
   of DNS resolvers.  Typically, evaluating the DNS privacy statement,
   filtering policy, and the signatory, DNS clients with minimum human
   intervention can select the DNS server that best supports the user's
   desired privacy and filtering policy.

   This assertion is useful for encrypted DNS (e.g., DNS-over-TLS, DNS-
   over-HTTPS, DNS-over-QUIC) servers that are either public resolvers
   or discovered in a 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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 4, 2021.

Reddy, et al.             Expires March 4, 2021                 [Page 1]
Internet-Draft    DNS Server Info with Assertion Token       August 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Sample Use Cases  . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Policy Assertion Token (PAT): Overview  . . . . . . . . . . .   6
   5.  PAT Header  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  'typ' (Type) Header Parameter . . . . . . . . . . . . . .   7
     5.2.  'alg' (Algorithm) Header Parameter  . . . . . . . . . . .   8
     5.3.  'x5u' (X.509 URL) Header Parameter  . . . . . . . . . . .   8
     5.4.  An Example of PAT Header  . . . . . . . . . . . . . . . .   8
   6.  PAT Payload . . . . . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  JWT Defined Claims  . . . . . . . . . . . . . . . . . . .   9
       6.1.1.  'iat' - Issued At Claim . . . . . . . . . . . . . . .   9
       6.1.2.  'exp' - Expiration Time Claim . . . . . . . . . . . .   9
     6.2.  PAT Specific Claims . . . . . . . . . . . . . . . . . . .   9
       6.2.1.  DNS Server Identity Claims  . . . . . . . . . . . . .  10
       6.2.2.  'policyinfo' (Policy Information) Claim . . . . . . .  10
       6.2.3.  Example . . . . . . . . . . . . . . . . . . . . . . .  12
   7.  PAT Signature . . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  Extending PAT . . . . . . . . . . . . . . . . . . . . . . . .  13
   9.  Deterministic JSON Serialization  . . . . . . . . . . . . . .  13
     9.1.  Example PAT Deterministic JSON Form . . . . . . . . . . .  14
   10. Using RESINFO responses . . . . . . . . . . . . . . . . . . .  14
   11. Privacy Considerations  . . . . . . . . . . . . . . . . . . .  15
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  16
   13. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
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