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A Posture Transport Protocol over TLS (PT-TLS)
RFC 6876

Internet Engineering Task Force (IETF)                       P. Sangster
Request for Comments: 6876                          Symantec Corporation
Category: Standards Track                                  N. Cam-Winget
ISSN: 2070-1721                                               J. Salowey
                                                           Cisco Systems
                                                           February 2013

             A Posture Transport Protocol over TLS (PT-TLS)

Abstract

   This document specifies PT-TLS, a TLS-based Posture Transport (PT)
   protocol.  The PT-TLS protocol carries the Network Endpoint
   Assessment (NEA) message exchange under the protection of a Transport
   Layer Security (TLS) secured tunnel.

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/rfc6876.

Copyright Notice

   Copyright (c) 2013 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, et al.             Standards Track                    [Page 1]
RFC 6876                         PT-TLS                    February 2013

Table of Contents

   1. Introduction ....................................................3
      1.1. Prerequisites ..............................................4
      1.2. Message Diagram Conventions ................................4
      1.3. Conventions Used in This Document ..........................4
      1.4. Compatibility with Other Specifications ....................4
   2. Design Considerations ...........................................5
      2.1. Benefits of TCP/IP Connectivity ............................5
      2.2. Leveraging Proven TLS Security .............................6
      2.3. TLV-Based Message Encapsulation ............................6
      2.4. No Change to Base TLS Protocol .............................6
   3. PT-TLS Protocol .................................................7
      3.1. Initiating a PT-TLS Session ................................8
           3.1.1. Issues with Server-Initiated PT-TLS Sessions ........8
           3.1.2. Establish or Re-Use Existing PT-TLS Session .........9
      3.2. TCP Port Usage .............................................9
      3.3. Preventing MITM Attacks with Channel Bindings ..............9
      3.4. PT-TLS Message Flow .......................................10
           3.4.1. Assessment Triggers ................................10
           3.4.2. PT-TLS Message Exchange Phases .....................11
                  3.4.2.1. TLS Setup Phase ...........................12
                  3.4.2.2. PT-TLS Negotiation Phase ..................13
                  3.4.2.3. PT-TLS Data Transport Phase ...............14
           3.4.3. TLS Requirements ...................................14
      3.5. PT-TLS Message Format .....................................15
      3.6. IETF Namespace PT-TLS Message Types .......................18
      3.7. PT-TLS Version Negotiation ................................20
           3.7.1. Version Request Message ............................21
           3.7.2. Version Response Message ...........................22
      3.8. Client Authentication Using SASL ..........................22
           3.8.1. SASL Client Authentication Requirements ............23
           3.8.2. SASL in PT-TLS Overview ............................24
           3.8.3. SASL Authentication Flow ...........................24
           3.8.4. Aborting SASL Authentication .......................25
           3.8.5. Linkages to SASL Framework .........................25
                  3.8.5.1. SASL Service Name .........................25
                  3.8.5.2. SASL Authorization Identity ...............25
                  3.8.5.3. SASL Security Layer .......................25

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