DNS-SD Privacy and Security Requirements
draft-ietf-dnssd-prireq-05

Document Type Active Internet-Draft (dnssd WG)
Last updated 2020-02-21
Replaces draft-huitema-dnssd-prireq
Stream IETF
Intended RFC status Informational
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd David Schinazi
Shepherd write-up Show (last changed 2020-01-16)
IESG IESG state IESG Evaluation
Consensus Boilerplate Yes
Telechat date On agenda of 2020-03-05 IESG telechat
Has enough positions to pass.
Responsible AD √Čric Vyncke
Send notices to David Schinazi <dschinazi.ietf@gmail.com>
IANA IANA review state IANA OK - No Actions Needed
Network Working Group                                         C. Huitema
Internet-Draft                                      Private Octopus Inc.
Intended status: Informational                                 D. Kaiser
Expires: August 24, 2020                        University of Luxembourg
                                                       February 21, 2020

                DNS-SD Privacy and Security Requirements
                       draft-ietf-dnssd-prireq-05

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 at a public hotspot, serious privacy
   problems arise.  We analyze the requirements of a privacy-respecting
   discovery service.

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
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 24, 2020.

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
   to this document.  Code Components extracted from this document must

Huitema & Kaiser         Expires August 24, 2020                [Page 1]
Internet-Draft         DNS-SD Privacy Requirements         February 2020

   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
   2.  Threat Model  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Threat Analysis . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Service Discovery Scenarios . . . . . . . . . . . . . . .   4
       3.1.1.  Private Client and Public Server  . . . . . . . . . .   4
       3.1.2.  Private Client and Private Server . . . . . . . . . .   5
       3.1.3.  Wearable Client and Server  . . . . . . . . . . . . .   6
     3.2.  DNS-SD Privacy Considerations . . . . . . . . . . . . . .   8
       3.2.1.  Information made available via DNS-SD Resource
               Records . . . . . . . . . . . . . . . . . . . . . . .   9
       3.2.2.  Privacy Implication of Publishing Service Instance
               Names . . . . . . . . . . . . . . . . . . . . . . . .   9
       3.2.3.  Privacy Implication of Publishing Node Names  . . . .  10
       3.2.4.  Privacy Implication of Publishing Service Attributes   10
       3.2.5.  Device Fingerprinting . . . . . . . . . . . . . . . .  11
       3.2.6.  Privacy Implication of Discovering Services . . . . .  12
     3.3.  Security Considerations . . . . . . . . . . . . . . . . .  12
       3.3.1.  Authenticity, Integrity & Freshness . . . . . . . . .  12
       3.3.2.  Confidentiality . . . . . . . . . . . . . . . . . . .  12
       3.3.3.  Resistance to Dictionary Attacks  . . . . . . . . . .  13
       3.3.4.  Resistance to Denial-of-Service Attacks . . . . . . .  13
       3.3.5.  Resistance to Sender Impersonation  . . . . . . . . .  13
       3.3.6.  Sender Deniability  . . . . . . . . . . . . . . . . .  13
     3.4.  Operational Considerations  . . . . . . . . . . . . . . .  13
       3.4.1.  Power Management  . . . . . . . . . . . . . . . . . .  13
       3.4.2.  Protocol Efficiency . . . . . . . . . . . . . . . . .  14
       3.4.3.  Secure Initialization and Trust Models  . . . . . . .  14
       3.4.4.  External Dependencies . . . . . . . . . . . . . . . .  15
   4.  Requirements for a DNS-SD Privacy Extension . . . . . . . . .  15
     4.1.  Private Client Requirements . . . . . . . . . . . . . . .  15
     4.2.  Private Server Requirements . . . . . . . . . . . . . . .  16
     4.3.  Security and Operation  . . . . . . . . . . . . . . . . .  16
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  17
   7.  Informative References  . . . . . . . . . . . . . . . . . . .  17
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