PacketCable Security Ticket Control Sub-Option for the DHCP CableLabs Client Configuration (CCC) Option
RFC 3594

Document Type RFC - Proposed Standard (September 2003; No errata)
Author Paul Duffy 
Last updated 2013-03-02
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IESG IESG state RFC 3594 (Proposed Standard)
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Responsible AD Thomas Narten
IESG note 2003-09-10: RFC 3594 appears
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Network Working Group                                           P. Duffy
Request for Comments: 3594                                 Cisco Systems
Category: Standards Track                                 September 2003

            PacketCable Security Ticket Control Sub-Option
       for the DHCP CableLabs Client Configuration (CCC) Option

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.


   This document defines a new sub-option for the DHCP CableLabs Client
   Configuration (CCC) Option.  This new sub-option will be used to
   direct CableLabs Client Devices (CCDs) to invalidate security tickets
   stored in CCD non volatile memory (i.e., locally persisted security

1.   Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in BCP 14, RFC 2119 [2].

2.   Terminology

   Definitions of terms/acronyms used throughout this document:

   CCC - CableLabs Client Configuration option, described in [1].

   CCD - CableLabs Client Device.  A PacketCable MTA is an example of a

   STC - Security Ticket Control.  The CCC sub-option described in this

Duffy                       Standards Track                     [Page 1]
RFC 3594                Security Ticket Control           September 2003

   MTA - Media Terminal Adapter.  The CCD specific to the PacketCable

   PacketCable - multimedia architecture developed by CableLabs.  See
         [8] for full details.

3.   Introduction

   The CableLabs Client Configuration Option [1] defines several
   sub-options used to configure devices deployed into CableLabs
   architectures.  These architectures implement the PacketCable
   Security Specification [4] (based on Kerberos V5 [5]), to support CCD
   authentication and establishment of security associations between
   CCDs and application servers.

   CCDs are permitted to retain security tickets in local persistent
   storage.  Thus a power-cycled CCD is enabled to avoid expensive
   ticket acquisition for locally persisted, non-expired tickets.  This
   feature greatly reduces the security overhead of a deployment.

   This sub-option allows the service provider to control the lifetime
   of tickets persisted locally on a CCD.  The service provider requires
   this capability to support operational functions such as forcing re-
   establishment of security associations, remote testing, and remote
   diagnostic of CCDs.

   It should be noted that, although based on the Kerberos V5 RFC [5],
   the PacketCable Security Specification is not a strict implementation
   of this RFC.  See [4] for details of the PacketCable Security

4.   Security Ticket Control Sub-option

   This sub-option defines a Ticket Control Mask (TCM) that instructs
   the CCD to validate/invalidate specific application server tickets.
   The sub-option is encoded as follows:

    Code   Len      TCM
   |  9  |  2  | m1  | m2  |

   The length MUST be 2.  The TCM field is encoded as an unsigned 16 bit
   quantity per network byte order.  Each bit of the TCM is assigned to
   a specific server or server group.  A bit value of 0 means the CCD
   MUST apply normal invalidation rules (defined in [4]) to the locally

Duffy                       Standards Track                     [Page 2]
RFC 3594                Security Ticket Control           September 2003

   persisted ticket for the server/server group. A bit value of 1 means
   the CCD MUST immediately invalidate the locally persisted ticket for
   the server/server group.

   Bit #0 is the least significant bit of the field.  The bit positions
   are assigned as follows:

      Bit #0 - the PacketCable Provisioning Server used by the CCD.

      Bit #1 - the group of all PacketCable Call Management Servers used
      by the CCD.

      Bit #2 - #15.  Reserved and MUST be set to 0.

   If a CCD does not locally store tickets, it MUST ignore this
   sub-option.  Bit values not known to the CCD MUST be ignored.

5.   IANA Considerations

   IANA has assigned a sub-option code to this sub-option from the
   "CableLabs Client Configuration" sub-option number space (maintained
   within the BOOTP-DHCP Parameters Registry).

   IANA has also set-up a new registry and will maintain a new number
   space of "CableLabs Client Configuration Option Ticket Control Mask
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