NSEC5, DNSSEC Authenticated Denial of Existence
draft-vcelak-nsec5-03

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Network Working Group                                          J. Vcelak
Internet-Draft                                                    CZ.NIC
Intended status: Standards Track                             S. Goldberg
Expires: March 23, 2017                                  D. Papadopoulos
                                                       Boston University
                                                      September 19, 2016

            NSEC5, DNSSEC Authenticated Denial of Existence
                         draft-vcelak-nsec5-03

Abstract

   The Domain Name System Security (DNSSEC) Extensions introduced the
   NSEC resource record (RR) for authenticated denial of existence and
   the NSEC3 for hashed authenticated denial of existence.  The NSEC RR
   allows for the entire zone contents to be enumerated if a server is
   queried for carefully chosen domain names; N queries suffice to
   enumerate a zone containing N names.  The NSEC3 RR adds domain-name
   hashing, which makes the zone enumeration harder, but not impossible.
   This document introduces NSEC5, which provides an cryptographically-
   proven mechanism that prevents zone enumeration.  NSEC5 has the
   additional advantage of not requiring private zone-signing keys to be
   present on all authoritative servers for the zone.

Status of This Memo

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   This Internet-Draft will expire on March 23, 2017.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Vcelak, et al.           Expires March 23, 2017                 [Page 1]
Internet-Draft                    NSEC5                   September 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Rationale . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .   5
   3.  How NSEC5 Works . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  NSEC5 Algorithms  . . . . . . . . . . . . . . . . . . . . . .   7
   5.  The NSEC5KEY Resource Record  . . . . . . . . . . . . . . . .   8
     5.1.  NSEC5KEY RDATA Wire Format  . . . . . . . . . . . . . . .   8
     5.2.  NSEC5KEY RDATA Presentation Format  . . . . . . . . . . .   8
   6.  The NSEC5 Resource Record . . . . . . . . . . . . . . . . . .   9
     6.1.  NSEC5 RDATA Wire Format . . . . . . . . . . . . . . . . .   9
     6.2.  NSEC5 Flags Field . . . . . . . . . . . . . . . . . . . .   9
     6.3.  NSEC5 RDATA Presentation Format . . . . . . . . . . . . .  10
   7.  The NSEC5PROOF Resource Record  . . . . . . . . . . . . . . .  10
     7.1.  NSEC5PROOF RDATA Wire Format  . . . . . . . . . . . . . .  11
     7.2.  NSEC5PROOF RDATA Presentation Format  . . . . . . . . . .  11
   8.  NSEC5 Proofs  . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  Name Error Responses  . . . . . . . . . . . . . . . . . .  12
     8.2.  No Data Responses . . . . . . . . . . . . . . . . . . . .  12
       8.2.1.  No Data Response, Opt-Out Not In Effect . . . . . . .  12
       8.2.2.  No Data Response, Opt-Out In Effect . . . . . . . . .  13
     8.3.  Wildcard Responses  . . . . . . . . . . . . . . . . . . .  13
     8.4.  Wildcard No Data Responses  . . . . . . . . . . . . . . .  14
   9.  Authoritative Server Considerations . . . . . . . . . . . . .  14
     9.1.  Zone Signing  . . . . . . . . . . . . . . . . . . . . . .  14
     9.2.  Zone Serving  . . . . . . . . . . . . . . . . . . . . . .  16
     9.3.  NSEC5KEY Rollover Mechanism . . . . . . . . . . . . . . .  17
     9.4.  Secondary Servers . . . . . . . . . . . . . . . . . . . .  17
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