Secret Key Transaction Authentication for DNS (TSIG)
draft-dupont-dnsop-rfc2845bis-00

Document Type Active Internet-Draft (dnsop WG)
Last updated 2017-11-13 (latest revision 2017-10-30)
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Internet Engineering Task Force                           F. Dupont, Ed.
Internet-Draft                                                 S. Morris
Obsoletes: 2845, 4635 (if approved)                                  ISC
Intended status: Standards Track                        October 30, 2017
Expires: May 3, 2018

          Secret Key Transaction Authentication for DNS (TSIG)
                    draft-dupont-dnsop-rfc2845bis-00

Abstract

   This protocol allows for transaction level authentication using
   shared secrets and one way hashing.  It can be used to authenticate
   dynamic updates as coming from an approved client, or to authenticate
   responses as coming from an approved recursive name server.

   No provision has been made here for distributing the shared secrets:
   it is expected that a network administrator will statically configure
   name servers and clients using some out of band mechanism such as
   sneaker-net until a secure automated mechanism for key distribution
   is available.

   This document includes revised original TSIG specifications (RFC2845)
   and the extension for HMAC-SHA (RFC4635).

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on May 3, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Dupont & Morris            Expires May 3, 2018                  [Page 1]
Internet-Draft                  DNS TSIG                    October 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Key words . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  New Assigned Numbers  . . . . . . . . . . . . . . . . . . . .   4
   4.  TSIG RR Format  . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  TSIG RR Type  . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  TSIG Calculation  . . . . . . . . . . . . . . . . . . . .   5
     4.3.  TSIG Record Format  . . . . . . . . . . . . . . . . . . .   5
       4.3.1.  TSIG RDATA Wire Format  . . . . . . . . . . . . . . .   6
     4.4.  Example . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Protocol Operation  . . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Effects of adding TSIG to outgoing message  . . . . . . .   8
     5.2.  TSIG processing on incoming messages  . . . . . . . . . .   8
     5.3.  Time values used in TSIG calculations . . . . . . . . . .   8
     5.4.  TSIG Variables and Coverage . . . . . . . . . . . . . . .   9
       5.4.1.  DNS Message . . . . . . . . . . . . . . . . . . . . .   9
       5.4.2.  TSIG Variables  . . . . . . . . . . . . . . . . . . .   9
       5.4.3.  Request MAC . . . . . . . . . . . . . . . . . . . . .  10
     5.5.  Padding . . . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Protocol Details  . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  TSIG generation on requests . . . . . . . . . . . . . . .  10
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