A method for mitigating namespace collisions
draft-wkumari-dnsop-defense-collision-mitigate-02

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Network Working Group                                          W. Kumari
Internet-Draft                                                    Google
Intended status: Experimental                         September 17, 2013
Expires: March 21, 2014

              A method for mitigating namespace collisions
           draft-wkumari-dnsop-defense-collision-mitigate-02

Abstract

   This document outlines a possible, but not recommended, method to
   mitigate the effect of collisions in the DNS namespace by providing a
   means for end users to disambiguate the conflict.

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 March 21, 2014.

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

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Table of Contents

   1.  Introduction / Background . . . . . . . . . . . . . . . . . .   2
   2.  Mitigation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Implementation / Disclaimers  . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   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 an employee of the organization enters
   'www.foo', is the goal 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 to explain some of the pitfalls with approaches like
   these.

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.

   The mitigation would lookup the name in multiple namespaces.  When 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 mitigation to cache the user's
   choice, and / or provide a means to set priorities.

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

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

      Replacing the resolver library entirelyT

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

      Proxying the request to a server that provides an interstitial
      page that allows the user to indicate the intended name (for
      applications such as HTTP requests)

   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
      (unattended machines, mail servers, etc.)

   o  The human / user may have no idea which is the correct choice,
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