Interoperable Domain Name System (DNS) Server Cookies
draft-ietf-dnsop-server-cookies-05

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DNSOP Working Group                                              O. Sury
Internet-Draft                               Internet Systems Consortium
Updates: 7873 (if approved)                                    W. Toorop
Intended status: Standards Track                              NLnet Labs
Expires: 17 July 2021                                    D. Eastlake 3rd
                                                  Futurewei Technologies
                                                              M. Andrews
                                             Internet Systems Consortium
                                                         13 January 2021

         Interoperable Domain Name System (DNS) Server Cookies
                   draft-ietf-dnsop-server-cookies-05

Abstract

   DNS Cookies, as specified in [RFC7873], are a lightweight DNS
   transaction security mechanism that provide limited protection to DNS
   servers and clients against a variety of amplification denial of
   service, forgery, or cache poisoning attacks by off-path attackers.

   This document updates [RFC7873] with precise directions for creating
   Server Cookies so that an anycast server set including diverse
   implementations will interoperate with standard clients, suggestions
   for constructing Client Cookies in a privacy preserving fashion, and
   suggestions on how to update a Server Secret.  An IANA registry
   listing the methods and associated pseudo random function suitable
   for creating DNS Server Cookies is created, with the method described
   in this document as the first and as of yet only entry.

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 17 July 2021.

Sury, et al.              Expires 17 July 2021                  [Page 1]
Internet-Draft               server-cookies                 January 2021

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology and Definitions . . . . . . . . . . . . . . .   3
   2.  Changes to [RFC7873]  . . . . . . . . . . . . . . . . . . . .   4
   3.  Constructing a Client Cookie  . . . . . . . . . . . . . . . .   4
   4.  Constructing a Server Cookie  . . . . . . . . . . . . . . . .   5
     4.1.  The Version Sub-Field . . . . . . . . . . . . . . . . . .   6
     4.2.  The Reserved Sub-Field  . . . . . . . . . . . . . . . . .   6
     4.3.  The Timestamp Sub-Field . . . . . . . . . . . . . . . . .   6
     4.4.  The Hash Sub-Field  . . . . . . . . . . . . . . . . . . .   7
   5.  Updating the Server Secret  . . . . . . . . . . . . . . . . .   8
   6.  Cookie Algorithms . . . . . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Security and Privacy Considerations . . . . . . . . . . . . .  10
     8.1.  Client Cookie construction  . . . . . . . . . . . . . . .  10
     8.2.  Server Cookie construction  . . . . . . . . . . . . . . .  11
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  12
   11. Informative References  . . . . . . . . . . . . . . . . . . .  13
   Appendix A.  Test vectors . . . . . . . . . . . . . . . . . . . .  13
     A.1.  Learning a new Server Cookie  . . . . . . . . . . . . . .  13
     A.2.  The same client learning a renewed (fresh) Server
           Cookie  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     A.3.  Another client learning a renewed Server Cookie . . . . .  15
     A.4.  IPv6 query with rolled over secret  . . . . . . . . . . .  16
   Appendix B.  Implementation status  . . . . . . . . . . . . . . .  17