Anonymity profile for DHCP clients
draft-ietf-dhc-anonymity-profile-00

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Document Type Active Internet-Draft (dhc WG)
Last updated 2015-05-19
Replaces draft-huitema-dhc-anonymity-profile
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Network Working Group                                         C. Huitema
Internet-Draft                                                 Microsoft
Updates: 4361 (if approved)                                 T. Mrugalski
Intended status: Standards Track                                     ISC
Expires: November 19, 2015                                   S. Krishnan
                                                                Ericsson
                                                            May 18, 2015

                   Anonymity profile for DHCP clients
                draft-ietf-dhc-anonymity-profile-00.txt

Abstract

   Some DHCP options carry unique identifiers.  These identifiers can
   enable device tracking even if the device administrator takes care of
   randomizing other potential identifications like link-layer addresses
   or IPv6 addresses.  The anonymity profile is designed for clients
   that wish to remain anonymous to the visited network.  The profile
   provides guidelines on the composition of DHCP or DHCPv6 requests,
   designed to minimize disclosure of identifying information.  This
   draft updates RFC4361.

Status of This Memo

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

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   This Internet-Draft will expire on November 19, 2015.

Copyright Notice

   Copyright (c) 2015 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
   (http://trustee.ietf.org/license-info) in effect on the date of

Huitema, et al.         Expires November 19, 2015               [Page 1]
Internet-Draft           DHCP Anonymity Profile                 May 2015

   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
   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
     1.1.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Application domain  . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  MAC Address Randomization hypotheses  . . . . . . . . . .   4
     2.2.  MAC Address Randomization and DHCP  . . . . . . . . . . .   5
     2.3.  Radio fingerprinting  . . . . . . . . . . . . . . . . . .   5
     2.4.  Operating system fingerprinting . . . . . . . . . . . . .   6
     2.5.  No anonymity profile identification . . . . . . . . . . .   6
     2.6.  Using the anonymity profiles  . . . . . . . . . . . . . .   7
     2.7.  What about privacy for DHCP servers . . . . . . . . . . .   7
   3.  Anonymity profile for DHCPv4  . . . . . . . . . . . . . . . .   8
     3.1.  Client IP address field . . . . . . . . . . . . . . . . .   8
     3.2.  Requested IP address option . . . . . . . . . . . . . . .   9
     3.3.  Client hardware address . . . . . . . . . . . . . . . . .   9
     3.4.  Client Identifier Option  . . . . . . . . . . . . . . . .   9
     3.5.  Host Name Option  . . . . . . . . . . . . . . . . . . . .  10
     3.6.  Client FQDN Option  . . . . . . . . . . . . . . . . . . .  11
     3.7.  UUID/GUID-based Client Identifier Option  . . . . . . . .  11
     3.8.  User and Vendor Class DHCP options  . . . . . . . . . . .  12
   4.  Anonymity profile for DHCPv6  . . . . . . . . . . . . . . . .  12
     4.1.  Do not send Confirm messages  . . . . . . . . . . . . . .  12
     4.2.  Client Identifier DHCPv6 Option . . . . . . . . . . . . .  13
       4.2.1.  Anonymous Information-Request . . . . . . . . . . . .  13
     4.3.  Server Identifier Option  . . . . . . . . . . . . . . . .  14
     4.4.  Address assignment options  . . . . . . . . . . . . . . .  14
       4.4.1.  Obtain temporary addresses  . . . . . . . . . . . . .  14
     4.5.  Option Request Option . . . . . . . . . . . . . . . . . .  15
       4.5.1.  Previous option values  . . . . . . . . . . . . . . .  15
     4.6.  Authentication Option . . . . . . . . . . . . . . . . . .  16
     4.7.  User and Vendor Class DHCPv6 options  . . . . . . . . . .  16
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