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Domain Name Associations (DNA) in the Extensible Messaging and Presence Protocol (XMPP)
draft-ietf-xmpp-dna-09

Document type: Active Internet-Draft (xmpp WG)
Document stream: IETF
Last updated: 2015-02-17
Intended RFC status: Unknown
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IETF State: In WG Last Call
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Network Working Group                                     P. Saint-Andre
Internet-Draft                                                      &yet
Intended status: Standards Track                               M. Miller
Expires: August 20, 2015                             Cisco Systems, Inc.
                                                               P. Hancke
                                                                    &yet
                                                       February 16, 2015

Domain Name Associations (DNA) in the Extensible Messaging and Presence
                            Protocol (XMPP)
                         draft-ietf-xmpp-dna-09

Abstract

   This document improves the security of the Extensible Messaging and
   Presence Protocol (XMPP) in two ways.  First, it specifies how to
   establish a strong association between a domain name and an XML
   stream, using the concept of "prooftypes".  Second, it describes how
   to securely delegate a service domain name (e.g., example.com) to a
   target server host name (e.g., hosting.example.net), which is
   especially important in multi-tenanted environments where the same
   target server hosts a large number of domains.

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
   Task Force (IETF).  Note that other groups may also distribute
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   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 20, 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

Saint-Andre, et al.      Expires August 20, 2015                [Page 1]
Internet-Draft                  XMPP DNA                   February 2015

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Client-to-Server (C2S) DNA  . . . . . . . . . . . . . . . . .   3
     3.1.  C2S Flow  . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  C2S Description . . . . . . . . . . . . . . . . . . . . .   4
   4.  Server-to-Server (S2S) DNA  . . . . . . . . . . . . . . . . .   5
     4.1.  S2S Flow  . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  A Simple S2S Scenario . . . . . . . . . . . . . . . . . .   8
     4.3.  One-Way Authentication  . . . . . . . . . . . . . . . . .   9
     4.4.  Piggybacking  . . . . . . . . . . . . . . . . . . . . . .  11
       4.4.1.  Assertion . . . . . . . . . . . . . . . . . . . . . .  11
       4.4.2.  Supposition . . . . . . . . . . . . . . . . . . . . .  12
   5.  Alternative Prooftypes  . . . . . . . . . . . . . . . . . . .  13
     5.1.  DANE  . . . . . . . . . . . . . . . . . . . . . . . . . .  14
     5.2.  POSH  . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   6.  Secure Delegation and Multi-Tenancy . . . . . . . . . . . . .  15
   7.  Prooftype Model . . . . . . . . . . . . . . . . . . . . . . .  16
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
     8.1.  Well-Known URI for xmpp-client Service  . . . . . . . . .  17
     8.2.  Well-Known URI for xmpp-server Service  . . . . . . . . .  17
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  18
     10.2.  Informative References . . . . . . . . . . . . . . . . .  19
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   In systems that use the Extensible Messaging and Presence Protocol

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