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Versions: 00 RFC 2872

                                                    Y.Bernet, Microsoft
                                                  R. Pabbati, Microsoft
Internet Draft                                            October, 1999
Document: draft-ietf-rap-rsvp-appid-00.txt          expires April, 2000


  Application and Sub Application Identity Policy Element for Use with
                                  RSVP


Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups. Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   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."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-
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   http://www.ietf.org/shadow.html.

   Distribution of this memo is unlimited.

   Copyright Notice

   Copyright (C) The Internet Society (1998). All Rights Reserved.


1. Abstract

   RSVP [RFC 2205] signaling messages typically include policy data
   objects, which in turn contain policy elements. Policy elements may
   describe user and/or application information, which may be used by
   RSVP aware network elements to apply appropriate policy decisions to
   a traffic flow. This informational draft details the usage of policy
   elements that provide application information.

2. Overview

   RSVP aware network elements may act as policy enforcement points
   (PEPs). These work together with policy decision points (PDPs) to
   enforce QoS policy. Briefly, PEPs extract policy information from
   RSVP signaling requests and compare the information against
   information stored in a policy database or directory. A policy
   decision is made based on the results of the comparison.


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   One type of policy information describes the application on behalf
   of which an RSVP signaling request is generated. When application
   policy information is available, network administrators are able to
   manage QoS based on application type. So for example, a network
   administrator may establish a policy that prioritizes known mission
   critical applications over games.

   We propose a hierarchical structure for application policy elements.
   Specifically, the highest level of the hierarchy specifies an
   application name. The next level specifies a version. At the next
   level, an arbitrary number of sub-applications may be specified. An
   example of a sub-application is 'print data'.

   In this draft, we show the structure of the application policy
   element. We also propose keywords for the various levels of the
   hierarchy. However, we do not enumerate values for applications,
   version numbers or sub-applications. Such an enumeration is beyond
   the scope of this draft.

3. Application Policy Element Structure

   General application policy elements are defined in [identity]. These
   are policy elements with a P-type of AUTH_APP (value 3). Following
   the policy element header is a list of authentication attributes.

   The first authentication attribute should be of the A-type
   POLICY_LOCATOR (value 1). The sub-type of the POLICY_LOCATOR
   attribute should be of type ASCII_DN (value 1) [RFC 1779]. The
   actual attribute data is formatted as an X.500 distinguished name
   (DN), representing the application, version number and sub-
   application.

   The second authentication attribute should be of the A-type
   CREDENTIAL (value 2). The sub-type of the CREDENTIAL attribute is of
   type ASCII_ID. The actual attribute data is an ASCII string
   representing the application name.

   This structure is illustrated in the following diagram:
















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               0              1               2               3

      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      |    PE Length (8)              |   P-type = 3 (AUTH_APP)       |

      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      |    Attribute Length           |   A-type = 1  | Sub-type = 1  |

      |                               | POLICY_LOCATOR|   ASCII_DN    |

      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      | Application policy locator attribute data in X.500 DN format  |

      |                         (see below)                           |

      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      |    Attribute Length           |   A-type = 2  | Sub-type = 1  |

      |                               |   CREDENTIAL  |   ASCII_ID    |

      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      |                 Application name as ASCII string              |

      |                         (e.g. SAP.EXE)                        |

      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   The policy locator attribute for an application policy element is
   conformant with the X.500 DN format[RFC 1779]. We propose the
   following keywords:

   Key  Attribute
   --------------
   APP  Application Name
   VER  Application Version Number
   SAPP Sub Application

   The following is an example of a conformant policy locator:

   APP=SAP, VER=1.1, SAPP=Print

4. Security Considerations

   The proposed simple policy element does not guarantee that element
   is indeed associated with the application it claims to be associated
   with. In order to provide such guarantees, it is necessary to sign
   applications. Signed application policy elements may be proposed at
   a future date. Note that typically, the application policy element
   will be included in an RSVP message with an encrypted and
   authenticated user policy element. A level of security is provided
   by trusting the application policy element only if the user policy
   element is trusted.

   All RSVP integrity considerations apply to the message containing
   the application policy element.

5. References

   [RFC2205] Braden, B., et al., "Resource Reservation Protocol (RSVP)
   - Version 1 Functional Specification", RFC 2205, September 1997.


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   [RFC-1779], Kille, S., A String Representation of Distinguished
   Names, March 1995

   [identity] Yadav, S., Yavatkar, R., Pabbati, R., Ford, P., Moore,
   T., Herzog, S., "Identity Representation for RSVP", Internet Draft,
   February 1999.

6.  Acknowledgments

   Thanks to Tim Moore and Shai Mohaban for their input.

7. Author's Addresses

   Bernet, Yoram
   Microsoft
   One Microsoft Way,
   Redmond, WA 98052
   Phone: (425) 936-9568
   Email: yoramb@microsoft.com

   Pabbati, Ramesh
   One Microsoft Way,
   Redmond, WA 98052
   Email: rameshpa@microsoft.co

   This draft expires April, 2000



























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