Service Registration Protocol for DNS-Based Service Discovery
draft-ietf-dnssd-srp-04

Document Type Active Internet-Draft (dnssd WG)
Authors Ted Lemon  , Stuart Cheshire 
Last updated 2020-07-13
Replaces draft-sctl-service-registration
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Internet Engineering Task Force                                 T. Lemon
Internet-Draft                                               S. Cheshire
Intended status: Informational                                Apple Inc.
Expires: January 14, 2021                                  July 13, 2020

     Service Registration Protocol for DNS-Based Service Discovery
                        draft-ietf-dnssd-srp-04

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 makes it possible to
   deploy DNS Service Discovery without multicast, 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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on January 14, 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

Lemon & Cheshire        Expires January 14, 2021                [Page 1]
Internet-Draft        Service Registration Protocol            July 2020

   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   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
     2.4.  How to secure it  . . . . . . . . . . . . . . . . . . . .   7
       2.4.1.  First-Come First-Served Naming  . . . . . . . . . . .   8
       2.4.2.  Removing published services . . . . . . . . . . . . .   9
       2.4.3.  SRP Server Behavior . . . . . . . . . . . . . . . . .   9
     2.5.  TTL Consistency . . . . . . . . . . . . . . . . . . . . .  12
     2.6.  Maintenance . . . . . . . . . . . . . . . . . . . . . . .  13
       2.6.1.  Cleaning up stale data  . . . . . . . . . . . . . . .  13
       2.6.2.  Sleep Proxy . . . . . . . . . . . . . . . . . . . . .  14
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
     3.1.  Source Validation . . . . . . . . . . . . . . . . . . . .  15
     3.2.  SIG(0) signature validation . . . . . . . . . . . . . . .  16
     3.3.  Required Signature Algorithm  . . . . . . . . . . . . . .  16
   4.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  16
   5.  Delegation of 'service.arpa.' . . . . . . . . . . . . . . . .  16
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
     6.1.  Registration and Delegation of 'service.arpa' as a
           Special-Use Domain Name . . . . . . . . . . . . . . . . .  17
     6.2.  'dnssd-srp' Service Name  . . . . . . . . . . . . . . . .  17
     6.3.  'dnssd-srp-tls' Service Name  . . . . . . . . . . . . . .  17
     6.4.  Anycast Address . . . . . . . . . . . . . . . . . . . . .  17
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  18
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  18
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  19
   Appendix A.  Testing using standard RFC2136-compliant servers . .  20
   Appendix B.  How to allow services to update standard
                RFC2136-compliant servers  . . . . . . . . . . . . .  21
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