Service Registration Protocol for DNS-Based Service Discovery
draft-ietf-dnssd-srp-00

Document Type Active Internet-Draft (dnssd WG)
Last updated 2018-10-23
Replaces draft-sctl-service-registration
Stream IETF
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Internet Engineering Task Force                              S. Cheshire
Internet-Draft                                                Apple Inc.
Intended status: Informational                                  T. Lemon
Expires: April 26, 2019                              Nibbhaya Consulting
                                                        October 23, 2018

     Service Registration Protocol for DNS-Based Service Discovery
                        draft-ietf-dnssd-srp-00

Abstract

   The Service Registration Protocol for DNS-Based Service Discovery
   uses the standard DNS Update mechanism to enable DNS-Based Service
   Discovery using only unicast packets.  This eliminates the dependency
   on Multicast DNS as the foundation layer, which greatly improves
   scalability and improves performance on networks where multicast
   service is not an optimal choice, particularly 802.11 (Wi-Fi) and
   802.15.4 (IoT) networks.  DNS-SD Service registration uses public
   keys and SIG(0) to allow services to defend their registrations
   against attack.

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 April 26, 2019.

Copyright Notice

   Copyright (c) 2018 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

Cheshire & Lemon         Expires April 26, 2019                 [Page 1]
Internet-Draft        Service Registration Protocol         October 2018

   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Service Registration Protocol . . . . . . . . . . . . . . . .   4
     2.1.  What to publish . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Where to publish it . . . . . . . . . . . . . . . . . . .   6
     2.3.  How to publish it . . . . . . . . . . . . . . . . . . . .   6
       2.3.1.  How DNS-SD Service Registration differs from standard
               RFC2136 DNS Update  . . . . . . . . . . . . . . . . .   7
       2.3.2.  Testing using standard RFC2136-compliant servers  . .   7
       2.3.3.  How to allow services to update standard
               RFC2136-compliant servers . . . . . . . . . . . . . .   7
     2.4.  How to secure it  . . . . . . . . . . . . . . . . . . . .   8
       2.4.1.  First-Come First-Served Naming  . . . . . . . . . . .   8
       2.4.2.  SRP Server Behavior . . . . . . . . . . . . . . . . .   9
     2.5.  TTL Consistency . . . . . . . . . . . . . . . . . . . . .  12
     2.6.  Maintenance . . . . . . . . . . . . . . . . . . . . . . .  12
       2.6.1.  Cleaning up stale data  . . . . . . . . . . . . . . .  12
       2.6.2.  Sleep Proxy . . . . . . . . . . . . . . . . . . . . .  13
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   4.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  15
   5.  Delegation of 'services.arpa.'  . . . . . . . . . . . . . . .  15
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  16
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   DNS-Based Service Discovery [RFC6763] is a component of Zero
   Configuration Networking [RFC6760] [ZC] [I-D.cheshire-dnssd-roadmap].

   This document describes an enhancement to DNS-Based Service Discovery
   [RFC6763] that allows services to automatically register their
   services using the DNS protocol rather than using Multicast DNS
   [RFC6762] (mDNS).  There is already a large installed base of DNS-SD
   clients that can do service discovery using the DNS protocol.  This
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