Using Generic Security Service Application Program Interface (GSS-API) Mechanisms in Simple Authentication and Security Layer (SASL): The GS2 Mechanism Family
RFC 5801

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Internet Engineering Task Force (IETF)                      S. Josefsson
Request for Comments: 5801                                        SJD AB
Category: Standards Track                                    N. Williams
ISSN: 2070-1721                                                   Oracle
                                                               July 2010

 Using Generic Security Service Application Program Interface (GSS-API)
     Mechanisms in Simple Authentication and Security Layer (SASL):
                        The GS2 Mechanism Family

Abstract

   This document describes how to use a Generic Security Service
   Application Program Interface (GSS-API) mechanism in the Simple
   Authentication and Security Layer (SASL) framework.  This is done by
   defining a new SASL mechanism family, called GS2.  This mechanism
   family offers a number of improvements over the previous "SASL/
   GSSAPI" mechanism: it is more general, uses fewer messages for the
   authentication phase in some cases, and supports negotiable use of
   channel binding.  Only GSS-API mechanisms that support channel
   binding and mutual authentication are supported.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5801.

Josefsson & Williams         Standards Track                    [Page 1]
RFC 5801                       SASL GS2-*                      July 2010

Copyright Notice

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   document authors.  All rights reserved.

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Josefsson & Williams         Standards Track                    [Page 2]
RFC 5801                       SASL GS2-*                      July 2010

Table of Contents

   1. Introduction ....................................................4
   2. Conventions Used in This Document ...............................5
   3. Mechanism Name ..................................................5
      3.1. Generating SASL Mechanism Names from GSS-API OIDs ..........5
      3.2. Computing Mechanism Names Manually .........................6
      3.3. Examples ...................................................6
      3.4. Grandfathered Mechanism Names ..............................7
   4. SASL Authentication Exchange Message Format .....................8
   5. Channel Bindings ...............................................10
      5.1. Content of GSS-CHANNEL-BINDINGS Structure .................11
      5.2. Default Channel Binding ...................................12
   6. Examples .......................................................12
   7. Authentication Conditions ......................................14
   8. GSS-API Parameters .............................................15
   9. Naming .........................................................15
   10. GSS_Inquire_SASLname_for_mech Call ............................15
      10.1. gss_inquire_saslname_for_mech ............................16
   11. GSS_Inquire_mech_for_SASLname Call ............................18
      11.1. gss_inquire_mech_for_saslname ............................19
   12. Security Layers ...............................................20
   13. Interoperability with the SASL GSSAPI Mechanism ...............20