DNS-SD Privacy and Security Requirements
draft-ietf-dnssd-prireq-02

Document Type Active Internet-Draft (dnssd WG)
Last updated 2019-07-25
Replaces draft-huitema-dnssd-prireq
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Network Working Group                                         C. Huitema
Internet-Draft                                      Private Octopus Inc.
Intended status: Informational                                 D. Kaiser
Expires: January 26, 2020                       University of Luxembourg
                                                           July 25, 2019

                DNS-SD Privacy and Security Requirements
                       draft-ietf-dnssd-prireq-02

Abstract

   DNS-SD (DNS Service Discovery) normally discloses information about
   devices offering and requesting services.  This information includes
   host names, network parameters, and possibly a further description of
   the corresponding service instance.  Especially when mobile devices
   engage in DNS Service Discovery over Multicast DNS at a public
   hotspot, serious privacy problems arise.  We analyze the requirements
   of a privacy respecting discovery service.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 26, 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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Huitema & Kaiser        Expires January 26, 2020                [Page 1]
Internet-Draft         DNS-SD Privacy Requirements             July 2019

   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
     1.1.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Service Discovery Scenarios . . . . . . . . . . . . . . . . .   3
     2.1.  Private Client and Public Server  . . . . . . . . . . . .   3
     2.2.  Private Client and Private Server . . . . . . . . . . . .   4
     2.3.  Wearable Client and Server  . . . . . . . . . . . . . . .   5
   3.  DNS-SD Privacy Considerations . . . . . . . . . . . . . . . .   6
     3.1.  Privacy Implication of Publishing Service Instance Names    7
     3.2.  Privacy Implication of Publishing Node Names  . . . . . .   8
     3.3.  Privacy Implication of Publishing Service Attributes  . .   8
     3.4.  Device Fingerprinting . . . . . . . . . . . . . . . . . .   9
     3.5.  Privacy Implication of Discovering Services . . . . . . .  10
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
     4.1.  Authenticity, Integrity & Freshness . . . . . . . . . . .  10
     4.2.  Confidentiality . . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Resistance to Dictionary Attacks  . . . . . . . . . . . .  11
     4.4.  Resistance to Denial-of-Service Attacks . . . . . . . . .  11
     4.5.  Resistance to Sender Impersonation  . . . . . . . . . . .  11
     4.6.  Sender Deniability  . . . . . . . . . . . . . . . . . . .  11
   5.  Operational Considerations  . . . . . . . . . . . . . . . . .  11
     5.1.  Power Management  . . . . . . . . . . . . . . . . . . . .  11
     5.2.  Protocol Efficiency . . . . . . . . . . . . . . . . . . .  12
     5.3.  Secure Initialization and Trust Models  . . . . . . . . .  12
     5.4.  External Dependencies . . . . . . . . . . . . . . . . . .  13
   6.  Requirements for a DNS-SD Privacy Extension . . . . . . . . .  13
     6.1.  Private Client requirements . . . . . . . . . . . . . . .  14
     6.2.  Private Server Requirements . . . . . . . . . . . . . . .  14
     6.3.  Security and Operation  . . . . . . . . . . . . . . . . .  15
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  15
   9.  Informative References  . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   DNS-SD [RFC6763] over mDNS [RFC6762] enables zero-configuration
   service discovery in local networks.  It is very convenient for
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