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PA-TNC: A Posture Attribute (PA) Protocol Compatible with Trusted Network Connect (TNC)
RFC 5792

Internet Engineering Task Force (IETF)                       P. Sangster
Request for Comments: 5792                          Symantec Corporation
Category: Standards Track                                     K. Narayan
ISSN: 2070-1721                                            Cisco Systems
                                                              March 2010

          PA-TNC: A Posture Attribute (PA) Protocol Compatible
                   with Trusted Network Connect (TNC)

Abstract

   This document specifies PA-TNC, a Posture Attribute protocol
   identical to the Trusted Computing Group's IF-M 1.0 protocol.  The
   document then evaluates PA-TNC against the requirements defined in
   the NEA Requirements specification.

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/rfc5792.

Copyright Notice

   Copyright (c) 2010 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.

Sangster & Narayan           Standards Track                    [Page 1]
RFC 5792                         PA-TNC                       March 2010

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................4
      1.1. Prerequisites ..............................................4
      1.2. Message Diagram Conventions ................................4
      1.3. Conventions Used in This Document ..........................4
   2. Design Considerations ...........................................4
      2.1. Standard Attribute Namespace for Interoperability ..........4
      2.2. Vendor-Defined Namespace for Differentiation and Agility ...5
      2.3. Use of TLV-Based Encoding for Efficiency ...................6
   3. PA-TNC Message Protocol .........................................7
      3.1. PA-TNC Messaging Model .....................................7
      3.2. PA-TNC Relationship to PB-TNC ..............................8
      3.3. PB-PA Posture Collector and Posture Validator
           Identifiers ...............................................10
      3.4. PA-TNC Messages in PB-TNC .................................10
      3.5. IETF Standard PA Subtypes .................................11
      3.6. PA-TNC Message Header Format ..............................12
   4. PA-TNC Attributes ..............................................13
      4.1.  PA-TNC Attribute Header ..................................13
      4.2.  IETF Standard PA-TNC Attribute Types .....................17
           4.2.1. Attribute Request ..................................18
           4.2.2. Product Information ................................20
           4.2.3. Numeric Version ....................................22
           4.2.4. String Version .....................................24
           4.2.5. Operational Status .................................26
           4.2.6. Port Filter ........................................29
           4.2.7. Installed Packages .................................31
           4.2.8. PA-TNC Error .......................................34

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