Using the Network Time Security Specification to Secure the Network Time Protocol
draft-ietf-ntp-using-nts-for-ntp-00

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NTP Working Group                                              D. Sibold
Internet-Draft                                                       PTB
Intended status: Standards Track                             S. Roettger
Expires: September 7, 2015                                    Google Inc
                                                              K. Teichel
                                                                     PTB
                                                          March 06, 2015

Using the Network Time Security Specification to Secure the Network Time
                                Protocol
                draft-ietf-ntp-using-nts-for-ntp-00.txt

Abstract

   This document describes how to use the measures described in the
   Network Time Security (NTS) specification to secure time
   synchronization with servers using the Network Time Protocol (NTP).

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
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   This Internet-Draft will expire on September 7, 2015.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Sibold, et al.          Expires September 7, 2015               [Page 1]
Internet-Draft                   NTS4NTP                      March 2015

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Objectives  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terms and Abbreviations . . . . . . . . . . . . . . . . . . .   4
   4.  Overview of NTS-Secured NTP . . . . . . . . . . . . . . . . .   4
     4.1.  Symmetric and Client/Server Mode  . . . . . . . . . . . .   4
     4.2.  Broadcast Mode  . . . . . . . . . . . . . . . . . . . . .   4
   5.  Protocol Sequence . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  The Client  . . . . . . . . . . . . . . . . . . . . . . .   4
       5.1.1.  The Client in Unicast Mode  . . . . . . . . . . . . .   4
       5.1.2.  The Client in Broadcast Mode  . . . . . . . . . . . .   6
     5.2.  The Server  . . . . . . . . . . . . . . . . . . . . . . .   8
       5.2.1.  The Server in Unicast Mode  . . . . . . . . . . . . .   8
       5.2.2.  The Server in Broadcast Mode  . . . . . . . . . . . .   9
   6.  Implementation Notes: ASN.1 Structures and Use of the CMS . .   9
     6.1.  Unicast Messages  . . . . . . . . . . . . . . . . . . . .   9
       6.1.1.  Association Messages  . . . . . . . . . . . . . . . .   9
       6.1.2.  Cookie Messages . . . . . . . . . . . . . . . . . . .  10
       6.1.3.  Time Synchronization Messages . . . . . . . . . . . .  10
     6.2.  Broadcast Messages  . . . . . . . . . . . . . . . . . . .  11
       6.2.1.  Broadcast Parameter Messages  . . . . . . . . . . . .  11
       6.2.2.  Broadcast Time Synchronization Message  . . . . . . .  11
       6.2.3.  Broadcast Keycheck  . . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
     7.1.  Usage of NTP Pools  . . . . . . . . . . . . . . . . . . .  12
     7.2.  Server Seed Lifetime  . . . . . . . . . . . . . . . . . .  12
     7.3.  Supported Hash Algorithms . . . . . . . . . . . . . . . .  12
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Appendix A.  Flow Diagrams of Client Behaviour  . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16
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