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Authorization for NSIS Signaling Layer Protocols
RFC 5981

Internet Engineering Task Force (IETF)                         J. Manner
Request for Comments: 5981                              Aalto University
Category: Experimental                                    M. Stiemerling
ISSN: 2070-1721                                                      NEC
                                                           H. Tschofenig
                                                  Nokia Siemens Networks
                                                           R. Bless, Ed.
                                                                     KIT
                                                           February 2011

            Authorization for NSIS Signaling Layer Protocols

Abstract

   Signaling layer protocols specified within the Next Steps in
   Signaling (NSIS) framework may rely on the General Internet Signaling
   Transport (GIST) protocol to handle authorization.  Still, the
   signaling layer protocol above GIST itself may require separate
   authorization to be performed when a node receives a request for a
   certain kind of service or resources.  This document presents a
   generic model and object formats for session authorization within the
   NSIS signaling layer protocols.  The goal of session authorization is
   to allow the exchange of information between network elements in
   order to authorize the use of resources for a service and to
   coordinate actions between the signaling and transport planes.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see 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/rfc5981.

Manner, et al.                Experimental                      [Page 1]
RFC 5981                        NSLP AUTH                  February 2011

Copyright Notice

   Copyright (c) 2011 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
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  4
   3.  Session Authorization Object . . . . . . . . . . . . . . . . .  4
     3.1.  Session Authorization Object format  . . . . . . . . . . .  5
     3.2.  Session Authorization Attributes . . . . . . . . . . . . .  6
       3.2.1.  Authorizing Entity Identifier  . . . . . . . . . . . .  7
       3.2.2.  Session Identifier . . . . . . . . . . . . . . . . . .  9
       3.2.3.  Source Address . . . . . . . . . . . . . . . . . . . .  9
       3.2.4.  Destination Address  . . . . . . . . . . . . . . . . . 11
       3.2.5.  Start Time . . . . . . . . . . . . . . . . . . . . . . 12
       3.2.6.  End Time . . . . . . . . . . . . . . . . . . . . . . . 13
       3.2.7.  NSLP Object List . . . . . . . . . . . . . . . . . . . 13
       3.2.8.  Authentication Data  . . . . . . . . . . . . . . . . . 15
   4.  Integrity of the SESSION_AUTH Object . . . . . . . . . . . . . 15
     4.1.  Shared Symmetric Keys  . . . . . . . . . . . . . . . . . . 15
       4.1.1.  Operational Setting Using Shared Symmetric Keys  . . . 16
     4.2.  Kerberos . . . . . . . . . . . . . . . . . . . . . . . . . 17
     4.3.  Public Key . . . . . . . . . . . . . . . . . . . . . . . . 18
       4.3.1.  Operational Setting for Public-Key-Based
               Authentication . . . . . . . . . . . . . . . . . . . . 19
     4.4.  HMAC Signed  . . . . . . . . . . . . . . . . . . . . . . . 21
   5.  Framework  . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     5.1.  The Coupled Model  . . . . . . . . . . . . . . . . . . . . 23
     5.2.  The Associated Model with One Policy Server  . . . . . . . 23

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