Related Domains By DNS
draft-brotman-rdbd-03

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Network Working Group                                         A. Brotman
Internet-Draft                                              Comcast, Inc
Intended status: Standards Track                              S. Farrell
Expires: March 21, 2020                           Trinity College Dublin
                                                      September 18, 2019

                         Related Domains By DNS
                         draft-brotman-rdbd-03

Abstract

   This document describes a mechanism by which a DNS domain can
   publicly document the existence or absence of a relationship with a
   different domain, called "Related Domains By DNS", or "RDBD."

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on March 21, 2020.

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
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Brotman & Farrell        Expires March 21, 2020                 [Page 1]
Internet-Draft                    RDBD                    September 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Use-Cases . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  New Resource Record Types . . . . . . . . . . . . . . . . . .   4
     2.1.  RDBDKEY Resource Record Definition  . . . . . . . . . . .   4
     2.2.  RDBD Resource Record Definition . . . . . . . . . . . . .   5
   3.  RDBD processing . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Use-cases for Signatures  . . . . . . . . . . . . . . . . . .   8
     4.1.  Many-to-one Use-Case  . . . . . . . . . . . . . . . . . .   8
     4.2.  Extending DNSSEC  . . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
     5.1.  Efficiacy of signatures . . . . . . . . . . . . . . . . .   9
     5.2.  DNSSEC  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.3.  Lookup Loops  . . . . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  Implementation (and Toy Deployment:-) Status . . . .  11
   Appendix B.  Examples . . . . . . . . . . . . . . . . . . . . . .  11
   Appendix C.  Possible dig output... . . . . . . . . . . . . . . .  14
   Appendix D.  Changes and Open Issues  . . . . . . . . . . . . . .  15
     D.1.  Changes from -02 to -03 . . . . . . . . . . . . . . . . .  15
     D.2.  Changes from -01 to -02 . . . . . . . . . . . . . . . . .  16
     D.3.  Changes from -00 to -01 . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   Determining relationships between DNS domains can be one of the more
   difficult investigations on the Internet.  It is typical to see
   something such as "example.com" and "dept-example.com" and be unsure
   if there is an actual relationship between those two domains, or if
   one might be an attacker attempting to impersonate the other.  In
   some cases, anecdotal evidence from the DNS or WHOIS/RDAP may be
   sufficient.  However, service providers of various kinds may err on
   the side of caution and treat one of the domains as untrustworthy or
   abusive if it is not clear that the two domains are in fact related.
   This specification provides a way for one domain to explicitly
   document, or disavow, relationships with other domains, utilizing DNS
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