Domain Name System (DNS) Resource Record types for transferring covert information from primary to secondaries
draft-krecicki-dns-covert-00

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Last updated 2019-07-06
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DNSOP Working Group                                          W. Krecicki
Internet-Draft                                                   E. Hunt
Updates: 6195 (if approved)                                   D. Mahoney
Intended status: Standards Track                                     ISC
Expires: January 7, 2020                                    July 6, 2019

 Domain Name System (DNS) Resource Record types for transferring covert
                information from primary to secondaries
                      draft-krecicki-dns-covert-00

Abstract

   The Domain Name System (DNS) Resource Record TYPEs IANA registry
   reserves the range 128-255 for Q-TYPEs and Meta-TYPEs [RFC6895] -
   Resource Records that can only be queried for or contain transient
   data associated with a particular DNS message.

   This document reserves a range of RR TYPE numbers for Covert-TYPEs -
   types that are an integral part of the zone but cannot be accessed
   via a normal QUERY operation.

   Uses for such records could include zone comments that are
   transferrable with the zone, expiry times for dynamically updated
   records, or Zone Signing Keys for inline signing.  This document,
   however, does not define any specific Covert RR types.

Status of This Memo

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   This Internet-Draft will expire on January 7, 2020.

Krecicki, et al.         Expires January 7, 2020                [Page 1]
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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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Definitions . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Handling of Covert Resource Records . . . . . . . . . . . . .   3
     2.1.  The COVERT-OK option  . . . . . . . . . . . . . . . . . .   3
     2.2.  Protection of Zone Transfers  . . . . . . . . . . . . . .   3
     2.3.  Authoritative server behaviour  . . . . . . . . . . . . .   4
     2.4.  Recursive server behaviour  . . . . . . . . . . . . . . .   4
     2.5.  Interaction with DNSSEC . . . . . . . . . . . . . . . . .   4
     2.6.  Interaction with ZONEMD . . . . . . . . . . . . . . . . .   4
     2.7.  UPDATE behaviour  . . . . . . . . . . . . . . . . . . . .   4
   3.  Update to RRTYPE Allocation Template  . . . . . . . . . . . .   5
   4.  Security considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The Domain Name System (DNS) has no mechanism for sending control
   information in-band when transferring zone data from primary to
   secondary servers.  This document specifies a range of Resource
   Record TYPEs that can be used for this purpose.  Covert Resource
   Records can be transferred with the zone during zone transfer, but
   are not accessible by a normal QUERY operation.  It also specifies a
   method for informing the primary server that the secondary
   understands Covert semantics, and can be relied upon not to disclose
   contents of Covert RRs to querying clients.

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1.1.  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
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