A questionable method for mitigating namespace collisions
draft-wkumari-dnsop-defense-collision-mitigate-01

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Network Working Group                                          W. Kumari
Internet-Draft                                                    Google
Intended status: Experimental                              July 15, 2013
Expires: January 16, 2014

       A questionable method for mitigating namespace collisions
           draft-wkumari-dnsop-defense-collision-mitigate-01

Abstract

   This document outlines a method to mitigate the effect of collisions
   in the DNS namespace by providing a means for end users to
   disambiguate the conflict.

   I am publishing this to maybe establish prior art, but not to have
   anyone implement it.

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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   This Internet-Draft will expire on January 16, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   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
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Table of Contents

   1.  Introduction / Background . . . . . . . . . . . . . . . . . .   2
   2.  Mitigation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Implementation / Disclaimers  . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   Appendix A.  Changes / Author Notes.  . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction / Background

   Collisions in the DNS occur in multiple ways; one common case is that
   an organization has used an sub-domain (foo) of their primary domain
   (example.com) for corporate infrastructure, and then the string "foo"
   is delegated as a TLD.  When a employee of the organization enters
   'www.foo', are they trying to reach a machine in the internal
   namespace (www.foo.example.com) or the hostname 'www' in the 'foo'
   TLD?

   This document describes a means of disambiguating these, and similar
   cases.

   Implementation of these methods are not recommended; they are
   documented here for defensive purposes / to ensure that if one
   organization decides to implement it, others can as well.

2.  Mitigation

   The mitigation described in this document involves presenting the
   multiple options to the user, and allowing them to indicate which of
   the names is the one they were trying to reach, and then connecting
   to that.

   This could be accomplished in a number of ways, including:

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      Intercepting the resolution requests from the application in a
      "shim" type library

      Replacing the resolver library entirely

      Integrating this type of mitigation into applications (some web
      browsers already do something similar to this)

      Running a resolver locally on the workstation / host that return
      the address of a proxy.

   The mitigation would lookup the name in multiple namespaces, and if a
   conflict is detected, it would then provide a means for the user to
   indicate which one of the colliding names they wish to connect to,
   and return the disambiguated answer to the application.  An
   additional feature could be for the described mitigation to cache the
   user's choice, and / or provide a means to set priorities.

   There are a number of issues with this solution, including but not
   limited to:

   o  There may not be a human available to disambiguate the answer
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