Service Registration Protocol for DNS-Based Service Discovery
draft-ietf-dnssd-srp-09

Document Type Active Internet-Draft (dnssd WG)
Authors Ted Lemon  , Stuart Cheshire 
Last updated 2021-01-11
Replaces draft-sctl-service-registration
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Internet Engineering Task Force                                 T. Lemon
Internet-Draft                                               S. Cheshire
Intended status: Standards Track                              Apple Inc.
Expires: 15 July 2021                                    11 January 2021

     Service Registration Protocol for DNS-Based Service Discovery
                        draft-ietf-dnssd-srp-09

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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   This Internet-Draft will expire on 15 July 2021.

Copyright Notice

   Copyright (c) 2021 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 to this document.  Code Components

Lemon & Cheshire          Expires 15 July 2021                  [Page 1]
Internet-Draft        Service Registration Protocol         January 2021

   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 . . . . . . . . . . . . . . . .   5
     2.1.  Protocol Variants . . . . . . . . . . . . . . . . . . . .   5
       2.1.1.  Full-featured Hosts . . . . . . . . . . . . . . . . .   5
       2.1.2.  Constrained Hosts . . . . . . . . . . . . . . . . . .   6
       2.1.3.  Why two variants? . . . . . . . . . . . . . . . . . .   6
     2.2.  Protocol Details  . . . . . . . . . . . . . . . . . . . .   6
       2.2.1.  What to publish . . . . . . . . . . . . . . . . . . .   7
       2.2.2.  Where to publish it . . . . . . . . . . . . . . . . .   7
       2.2.3.  How to publish it . . . . . . . . . . . . . . . . . .   8
       2.2.4.  How to secure it  . . . . . . . . . . . . . . . . . .   9
       2.2.5.  Service Behavior  . . . . . . . . . . . . . . . . . .   9
     2.3.  SRP Server Behavior . . . . . . . . . . . . . . . . . . .  12
       2.3.1.  Validation of Adds and Deletes  . . . . . . . . . . .  12
       2.3.2.  Valid SRP Update Requirements . . . . . . . . . . . .  14
       2.3.3.  FCFS Name And Signature Validation  . . . . . . . . .  15
       2.3.4.  SRP Update response . . . . . . . . . . . . . . . . .  16
       2.3.5.  Optional Behavior . . . . . . . . . . . . . . . . . .  16
   3.  TTL Consistency . . . . . . . . . . . . . . . . . . . . . . .  17
   4.  Maintenance . . . . . . . . . . . . . . . . . . . . . . . . .  17
     4.1.  Cleaning up stale data  . . . . . . . . . . . . . . . . .  17
   5.  Sleep Proxy . . . . . . . . . . . . . . . . . . . . . . . . .  19
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  20
     6.1.  Source Validation . . . . . . . . . . . . . . . . . . . .  20
     6.2.  SRP Server Authentication . . . . . . . . . . . . . . . .  21
     6.3.  Required Signature Algorithm  . . . . . . . . . . . . . .  21
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  21
   8.  Delegation of 'service.arpa.' . . . . . . . . . . . . . . . .  21
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
     9.1.  Registration and Delegation of 'service.arpa' as a
           Special-Use Domain Name . . . . . . . . . . . . . . . . .  22
     9.2.  'dnssd-srp' Service Name  . . . . . . . . . . . . . . . .  22
     9.3.  'dnssd-srp-tls' Service Name  . . . . . . . . . . . . . .  22
     9.4.  Anycast Address . . . . . . . . . . . . . . . . . . . . .  23
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