Private Discovery
draft-bradley-dnssd-private-discovery-02

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Last updated 2019-10-18
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Internet Engineering Task Force                               B. Bradley
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                        October 18, 2019
Expires: April 20, 2020

                           Private Discovery
                draft-bradley-dnssd-private-discovery-02

Abstract

   This document specifies a mechanism for advertising and discovering
   in a private manner.

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
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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
   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 20, 2020.

Copyright Notice

   Copyright (c) 2019 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
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   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.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   3
   3.  Protocol  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Probe . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Response  . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.3.  Announcement  . . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  Query . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.5.  Answer  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Timestamps  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Implicit Nonces . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Re-keying and Limits  . . . . . . . . . . . . . . . . . . . .   7
   7.  Message Formats . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  TLV Structure . . . . . . . . . . . . . . . . . . . . . .   8
     7.2.  TLV Items . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.3.  Message Types . . . . . . . . . . . . . . . . . . . . . .   9
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   10. To Do . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   11. Normative References  . . . . . . . . . . . . . . . . . . . .  11
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   Advertising and discovering devices and services on the network can
   leak a lot of information about a device or person, such as their
   name, the types of services they provide or use, and persistent
   identifiers.  This information can be used to identify and track a
   person's location and daily routine (e.g. buys coffee every morning
   at 8 AM at Starbucks on Main Street).  It can also reveal intimate
   details about a person's behavior and medical conditions, such as
   discovery requests for a glucose monitor, possibly indicating
   diabetes.

   This document specifies a system for advertising and discovery of
   devices and services while preserving privacy and confidentiality.

   This document does not specify how keys are provisioned.
   Provisioning keys is complex enough to justify its own document(s).
   This document assumes each peer has a long-term asymmetric key pair
   (LTPK and LTSK) and communicating peers have each other's long-term
   asymmetric public key (LTPK).

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2.  Conventions and Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   "Friend"
      A peer you have a cryptographic relationship with.  Specifically,
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