Protecting Network Time Security Messages with the Cryptographic Message Syntax (CMS)
draft-ietf-ntp-cms-for-nts-message-03

The information below is for an old version of the document
Document Type Active Internet-Draft (ntp WG)
Last updated 2015-04-01
Stream IETF
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream WG state WG Document (wg milestone: Feb 2016 - WGLC Protecting Netw... )
Document shepherd No shepherd assigned
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
NTP Working Group                                              D. Sibold
Internet-Draft                                                K. Teichel
Intended status: Standards Track                                     PTB
Expires: October 3, 2015                                     S. Roettger
                                                             Google Inc.
                                                              R. Housley
                                                          Vigil Security
                                                          April 01, 2015

Protecting Network Time Security Messages with the Cryptographic Message
                              Syntax (CMS)
               draft-ietf-ntp-cms-for-nts-message-03.txt

Abstract

   This document describes a convention for using the Cryptographic
   Message Syntax (CMS) to protect the messages in the Network Time
   Security (NTS) protocol.  NTS provides authentication of time servers
   as well as integrity protection of time synchronization messages
   using Network Time Protocol (NTP) or Precision Time Protocol (PTP).

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on October 3, 2015.

Sibold, et al.           Expires October 3, 2015                [Page 1]
Internet-Draft                   CMS4NTS                      April 2015

Copyright Notice

   Copyright (c) 2015 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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  CMS Conventions for NTS Message Protection  . . . . . . . . .   3
     2.1.  Fields of the employed CMS Content Types  . . . . . . . .   5
       2.1.1.  ContentInfo . . . . . . . . . . . . . . . . . . . . .   5
       2.1.2.  SignedData  . . . . . . . . . . . . . . . . . . . . .   6
       2.1.3.  EnvelopedData . . . . . . . . . . . . . . . . . . . .   8
   3.  Implementation Notes: ASN.1 Structures and Use of the CMS . .   9
     3.1.  Preliminaries . . . . . . . . . . . . . . . . . . . . . .   9
     3.2.  Unicast Messages  . . . . . . . . . . . . . . . . . . . .   9
       3.2.1.  Association Messages  . . . . . . . . . . . . . . . .   9
       3.2.2.  Cookie Messages . . . . . . . . . . . . . . . . . . .  10
       3.2.3.  Time Synchronization Messages . . . . . . . . . . . .  11
     3.3.  Broadcast Messages  . . . . . . . . . . . . . . . . . . .  11
       3.3.1.  Broadcast Parameter Messages  . . . . . . . . . . . .  11
       3.3.2.  Broadcast Time Synchronization Message  . . . . . . .  12
       3.3.3.  Broadcast Keycheck  . . . . . . . . . . . . . . . . .  13
   4.  Certificate Conventions . . . . . . . . . . . . . . . . . . .  13
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  ASN.1 Module . . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   This document provides details on how to construct NTS messages in
   practice.  NTS provides secure time synchronization with time servers
   using Network Time Protocol (NTP) [RFC5905] or Precision Time
Show full document text