Domain Name Associations (DNA) in the Extensible Messaging and Presence Protocol (XMPP)
draft-ietf-xmpp-dna-03

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Document Type Active Internet-Draft (xmpp WG)
Last updated 2013-09-06
Replaces draft-saintandre-xmpp-dna
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Network Working Group                                     P. Saint-Andre
Internet-Draft                                                 M. Miller
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: March 10, 2014                                September 6, 2013

Domain Name Associations (DNA) in the Extensible Messaging and Presence
                            Protocol (XMPP)
                         draft-ietf-xmpp-dna-03

Abstract

   This document improves the security of the Extensible Messaging and
   Presence Protocol (XMPP) in two ways.  First, it specifies how
   "prooftypes" can establish a strong association between a domain name
   and an XML stream.  Second, it describes how to securely delegate a
   source domain to a derived domain, which is especially important in
   virtual hosting environments.

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 http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on March 10, 2014.

Copyright Notice

   Copyright (c) 2013 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
   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

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  A Simple Scenario  . . . . . . . . . . . . . . . . . . . . . .  6
   5.  One-Way Authentication . . . . . . . . . . . . . . . . . . . .  7
   6.  Piggybacking . . . . . . . . . . . . . . . . . . . . . . . . .  8
     6.1.  Assertion  . . . . . . . . . . . . . . . . . . . . . . . .  8
     6.2.  Supposition  . . . . . . . . . . . . . . . . . . . . . . .  9
   7.  Alternative Prooftypes . . . . . . . . . . . . . . . . . . . . 10
     7.1.  DANE . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     7.2.  POSH . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
   8.  Secure Delegation and Multi-Tenancy  . . . . . . . . . . . . . 11
   9.  Prooftype Model  . . . . . . . . . . . . . . . . . . . . . . . 12
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
     10.1. Well-Known URI for xmpp-client Service . . . . . . . . . . 12
     10.2. Well-Known URI for xmpp-server Service . . . . . . . . . . 13
   11. Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     12.1. Normative References . . . . . . . . . . . . . . . . . . . 13
     12.2. Informative References . . . . . . . . . . . . . . . . . . 14
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14

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1.  Introduction

   The need to establish a strong association between a domain name and
   an XML stream arises in both client-to-server and server-to-server
   communication using the Extensible Messaging and Presence Protocol
   (XMPP), because XMPP servers are typically identified by DNS domain
   names.  However, a client or peer server needs to verify the identity
   of a server to which it connects.  To date, such verification has
   been established based on information obtained from the Domain Name
   System (DNS), the Public Key Infrastructure (PKI), or similar
   sources.  This document (1) generalizes the model currently in use so
   that additional prooftypes can be defined, (2) provides a basis for
   modernizing some prooftypes to reflect progress in underlying
   technologies such as DNS Security [RFC4033], and (3) describes the
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