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SAML Enhanced Client SASL and GSS-API Mechanisms
draft-ietf-kitten-sasl-saml-ec-11

Document type: Active Internet-Draft (kitten WG)
Document stream: IETF
Last updated: 2014-01-13
Intended RFC status: Unknown
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Network Working Group                                          S. Cantor
Internet-Draft                                     Shibboleth Consortium
Intended status: Standards Track                            S. Josefsson
Expires: July 17, 2014                                            SJD AB
                                                        January 13, 2014

            SAML Enhanced Client SASL and GSS-API Mechanisms
                 draft-ietf-kitten-sasl-saml-ec-11.txt

Abstract

   Security Assertion Markup Language (SAML) 2.0 is a generalized
   framework for the exchange of security-related information between
   asserting and relying parties.  Simple Authentication and Security
   Layer (SASL) and the Generic Security Service Application Program
   Interface (GSS-API) are application frameworks to facilitate an
   extensible authentication model.  This document specifies a SASL and
   GSS-API mechanism for SAML 2.0 that leverages the capabilities of a
   SAML-aware "enhanced client" to address significant barriers to
   federated authentication in a manner that encourages reuse of
   existing SAML bindings and profiles designed for non-browser
   scenarios.

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
   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 July 17, 2014.

Copyright Notice

   Copyright (c) 2014 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

Cantor & Josefsson        Expires July 17, 2014                 [Page 1]
Internet-Draft     SAML ECP SASL & GSS-API Mechanisms       January 2014

   (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 . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  6
   3.  Applicability for Non-HTTP Use Cases . . . . . . . . . . . . .  7
   4.  SAML SASL Mechanism Specification  . . . . . . . . . . . . . . 10
     4.1.  Advertisement  . . . . . . . . . . . . . . . . . . . . . . 10
     4.2.  Initiation . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.3.  Server Response  . . . . . . . . . . . . . . . . . . . . . 11
     4.4.  User Authentication with Identity Provider . . . . . . . . 11
     4.5.  Client Response  . . . . . . . . . . . . . . . . . . . . . 11
     4.6.  Outcome  . . . . . . . . . . . . . . . . . . . . . . . . . 11
     4.7.  Additional Notes . . . . . . . . . . . . . . . . . . . . . 11
   5.  SAML EC GSS-API Mechanism Specification  . . . . . . . . . . . 13
     5.1.  GSS-API Credential Delegation  . . . . . . . . . . . . . . 13
     5.2.  GSS-API Channel Binding  . . . . . . . . . . . . . . . . . 14
     5.3.  Session Key Derivation . . . . . . . . . . . . . . . . . . 15
       5.3.1.  Generated by Identity Provider . . . . . . . . . . . . 16
       5.3.2.  Alternate Key Derivation Mechanisms  . . . . . . . . . 16
     5.4.  Per-Message Tokens . . . . . . . . . . . . . . . . . . . . 17
     5.5.  Pseudo-Random Function (PRF) . . . . . . . . . . . . . . . 17
     5.6.  GSS-API Principal Name Types for SAML EC . . . . . . . . . 18
       5.6.1.  User Naming Considerations . . . . . . . . . . . . . . 18
       5.6.2.  Service Naming Considerations  . . . . . . . . . . . . 19
   6.  Example  . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 28
     7.1.  Risks Left Unaddressed . . . . . . . . . . . . . . . . . . 28
     7.2.  User Privacy . . . . . . . . . . . . . . . . . . . . . . . 28
     7.3.  Collusion between RPs  . . . . . . . . . . . . . . . . . . 29
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 30
     8.1.  GSS-API and SASL Mechanism Registration  . . . . . . . . . 30

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