Service binding and parameter specification via the DNS (DNS SVCB and HTTPS RRs)
draft-ietf-dnsop-svcb-https-01

Document Type Active Internet-Draft (dnsop WG)
Last updated 2020-09-06 (latest revision 2020-07-13)
Replaces draft-ietf-dnsop-svcb-httpssvc
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DNSOP Working Group                                          B. Schwartz
Internet-Draft                                                    Google
Intended status: Standards Track                               M. Bishop
Expires: January 14, 2021                                      E. Nygren
                                                     Akamai Technologies
                                                           July 13, 2020

 Service binding and parameter specification via the DNS (DNS SVCB and
                               HTTPS RRs)
                     draft-ietf-dnsop-svcb-https-01

Abstract

   This document specifies the "SVCB" and "HTTPS" DNS resource record
   (RR) types to facilitate the lookup of information needed to make
   connections to network services, such as for HTTPS origins.  SVCB
   records allow a service to be provided from multiple alternative
   endpoints, each with associated parameters (such as transport
   protocol configuration and keys for encrypting the TLS ClientHello).
   They also enable aliasing of apex domains, which is not possible with
   CNAME.  The HTTPS RR is a variation of SVCB for HTTPS and HTTP
   origins.  By providing more information to the client before it
   attempts to establish a connection, these records offer potential
   benefits to both performance and privacy.

   TO BE REMOVED: This proposal is inspired by and based on recent DNS
   usage proposals such as ALTSVC, ANAME, and ESNIKEYS (as well as long
   standing desires to have SRV or a functional equivalent implemented
   for HTTP).  These proposals each provide an important function but
   are potentially incompatible with each other, such as when an origin
   is load-balanced across multiple hosting providers (multi-CDN).
   Furthermore, these each add potential cases for adding additional
   record lookups in addition to AAAA/A lookups.  This design attempts
   to provide a unified framework that encompasses the key functionality
   of these proposals, as well as providing some extensibility for
   addressing similar future challenges.

   TO BE REMOVED: This document is being collaborated on in Github at:
   https://github.com/MikeBishop/dns-alt-svc [1].  The most recent
   working version of the document, open issues, etc. should all be
   available there.  The authors (gratefully) accept pull requests.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

Schwartz, et al.        Expires January 14, 2021                [Page 1]
Internet-Draft         SVCB and HTTPS RRs for DNS              July 2020

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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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Goals of the SVCB RR  . . . . . . . . . . . . . . . . . .   5
     1.2.  Overview of the SVCB RR . . . . . . . . . . . . . . . . .   6
     1.3.  Parameter for Encrypted ClientHello . . . . . . . . . . .   7
     1.4.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   7
   2.  The SVCB record type  . . . . . . . . . . . . . . . . . . . .   7
     2.1.  Zone file presentation format . . . . . . . . . . . . . .   8
     2.2.  RDATA wire format . . . . . . . . . . . . . . . . . . . .   9
     2.3.  SVCB owner names  . . . . . . . . . . . . . . . . . . . .  10
     2.4.  Modes . . . . . . . . . . . . . . . . . . . . . . . . . .  11
       2.4.1.  AliasMode . . . . . . . . . . . . . . . . . . . . . .  11
       2.4.2.  ServiceMode . . . . . . . . . . . . . . . . . . . . .  12
       2.4.3.  SvcPriority . . . . . . . . . . . . . . . . . . . . .  12
     2.5.  Special handling of "." in TargetName . . . . . . . . . .  12
       2.5.1.  AliasMode . . . . . . . . . . . . . . . . . . . . . .  13
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