Publishing Organization Boundaries in the DNS
draft-levine-dbound-dns-03

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Network Working Group                                          J. Levine
Internet-Draft                                      Taughannock Networks
Intended status: Informational                            April 27, 2019
Expires: October 29, 2019

             Publishing Organization Boundaries in the DNS
                       draft-levine-dbound-dns-03

Abstract

   The organization that manages a subtree in the DNS is often different
   from the one that manages the tree above it.  We describe an
   architecture to publish in the DNS the boundaries between
   organizations that can be adapted to various policy models and can be
   queried with a small number of DNS lookups.

Status of This Memo

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   This Internet-Draft will expire on October 29, 2019.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Levine                  Expires October 29, 2019                [Page 1]
Internet-Draft               Org Boundaries                   April 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Design Issues . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  TXT record format . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Lookup Process  . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  DNS Records . . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Application scenarios . . . . . . . . . . . . . . . . . . . .   7
     6.1.  DMARC . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.2.  Cookies . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.3.  SSL Certificates  . . . . . . . . . . . . . . . . . . . .   7
   7.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   8.  ABNF syntax of bound records  . . . . . . . . . . . . . . . .   8
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   10. Variations  . . . . . . . . . . . . . . . . . . . . . . . . .   8
   11. IANA considerations . . . . . . . . . . . . . . . . . . . . .   9
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     12.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Appendix A.  Change Log . . . . . . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   Often, the organization that manages a subtree in the DNS is
   different from the one that manages the tree above it.  Many
   applications use information about such boundaries to implement
   security policies.  For example, web browsers use them to limit the
   names where web cookies can be set, and Secure Socket Layer (SSL)
   certificate services use them to determine the party responsible for
   the domain in a signing request.  Mail security applications such as
   Domain-based Messaging Authentication, Reporting and Conformance
   (DMARC) use them to locate an organization's policy records in the
   DNS.  This specification is intended to provide boundaries usable for
   DMARC, and possibly for other applications.

   [[Please direct discussion of this draft to the dbound working group
   at dbound@ietf.org.]]

2.  Design Issues

   Organization boundaries can be assigned on what one could call an
   opt-in or opt-out basis.  "Opt-in" means that two names are only
   managed by the same organization if both actively assert that they
   are related.  "Opt-out" means that if there is any boundary
   information at all for a DNS subtree, each name is assumed to be
   under the same management as its parent unless there is a boundary
   assertion to the contrary.  This design describes an opt-out model.