[Docs] [txt|pdf|xml|html] [Tracker] [Email] [Nits]

Versions: 00

dnsop                                                        P. van Dijk
Internet-Draft                                                  PowerDNS
Intended status: Standards Track                       25 September 2020
Expires: 29 March 2021


              The VERBATIM Digest Algorithm for DS records
               draft-vandijk-dnsop-ds-digest-verbatim-00

Abstract

   The VERBATIM DS Digest is defined as a direct copy of the input data
   without any hashing.

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 29 March 2021.

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 (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Simplified BSD License text
   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.







van Dijk                  Expires 29 March 2021                 [Page 1]


Internet-Draft             ds-digest-verbatim             September 2020


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Document work . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Conventions and Definitions . . . . . . . . . . . . . . . . .   3
   4.  Implementation  . . . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Authoritative server changes  . . . . . . . . . . . . . .   3
     4.2.  Validating resolver changes . . . . . . . . . . . . . . .   3
     4.3.  Stub resolver changes . . . . . . . . . . . . . . . . . .   3
     4.4.  Zone validator changes  . . . . . . . . . . . . . . . . .   3
     4.5.  Domain registry changes . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   6.  Implementation Status . . . . . . . . . . . . . . . . . . . .   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   10. Informative References  . . . . . . . . . . . . . . . . . . .   4
   Appendix A.  Document history . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   The currently defined DS Digest Algorithms take the input data and
   hash it into a fixed-length form using well defined hashing
   algorithms (several SHA variants, and one mostly unused GOST
   algorithm).  That hashing operation makes any data inside the
   (C)DNSKEY record unreachable until that data is retrieved from the
   child zone.  Thus, DS records do not actually convey information;
   they merely verify information that can be retrieved elsewhere.

   A DS record set can only answer the question 'this data that I have
   here, do you recognise it?'.  For several imagined use cases for
   signed data at the parent, this might not be sufficient.

   This document introduces a new Digest Algorithm, proposed name
   VERBATIM (alternative suggestion: NULL).  The VERBATIM Digest
   Algorithm takes the input data (DNSKEY owner name | DNSKEY RDATA per
   section 5.1.4 of [RFC4034]) and copies it unmodified into the DS
   Digest field.

2.  Document work

   This document lives on GitHub (https://github.com/PowerDNS/draft-
   dnsop-ds-digest-verbatim); proposed text and editorial changes are
   very much welcomed there, but any functional changes should always
   first be discussed on the IETF DNSOP WG mailing list.





van Dijk                  Expires 29 March 2021                 [Page 2]


Internet-Draft             ds-digest-verbatim             September 2020


3.  Conventions and Definitions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

4.  Implementation

   The subsection titles in this section attempt to follow the
   terminology from [RFC8499] in as far as it has suitable terms.
   'Implementation' is understood to mean both 'code changes' and
   'operational changes' here.

4.1.  Authoritative server changes

   None, except where related tooling emits DS records to the
   administrator.

4.2.  Validating resolver changes

   Validating resolvers are encouraged to implement the VERBATIM Digest
   Algorithm.

4.3.  Stub resolver changes

   This specification defines no changes to query processing in stub
   resolvers.

4.4.  Zone validator changes

   Zone validators are encouraged to recognise the VERBATIM Digest
   Algorithm and, where possible, verify it against the child zone's
   DNSKEY, if it has any for the given algorithm.

4.5.  Domain registry changes

   Domain registries are encouraged to allow VERBATIM digests at their
   user's request.  However, a likely outcome is that domain registries
   will only allow the VERBATIM digest for DNSSEC algorithms whose
   specifications call for use of the VERBATIM digest.

5.  Security Considerations

   FIXME





van Dijk                  Expires 29 March 2021                 [Page 3]


Internet-Draft             ds-digest-verbatim             September 2020


6.  Implementation Status

   [RFC Editor: please remove this section before publication]

7.  IANA Considerations

   This document updates the IANA registry "Delegation Signer (DS)
   Resource Record (RR) Type Digest Algorithms" at
   https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml
   (https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml)

   The following entry is added to the registry:

   +--------------+----------------+
   | Value        | TBD            |
   | Description  | VERBATIM       |
   | Status       | OPTIONAL       |
   | Reference    | RFC TBD2       |
   +--------------+----------------+

8.  Acknowledgements

9.  Normative References

   [RFC4034]  Arends, R., Austein, R., Larson, M., Massey, D., and S.
              Rose, "Resource Records for the DNS Security Extensions",
              RFC 4034, DOI 10.17487/RFC4034, March 2005,
              <https://www.rfc-editor.org/info/rfc4034>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

10.  Informative References

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8499]  Hoffman, P., Sullivan, A., and K. Fujiwara, "DNS
              Terminology", BCP 219, RFC 8499, DOI 10.17487/RFC8499,
              January 2019, <https://www.rfc-editor.org/info/rfc8499>.

Appendix A.  Document history

Author's Address




van Dijk                  Expires 29 March 2021                 [Page 4]


Internet-Draft             ds-digest-verbatim             September 2020


   Peter van Dijk
   PowerDNS
   Den Haag
   Netherlands

   Email: peter.van.dijk@powerdns.com













































van Dijk                  Expires 29 March 2021                 [Page 5]


Html markup produced by rfcmarkup 1.129d, available from https://tools.ietf.org/tools/rfcmarkup/