Network Time Security
draft-ietf-ntp-network-time-security-00

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Document Type Active Internet-Draft (ntp WG)
Authors Dieter Sibold  , Stephen Roettger 
Last updated 2013-07-07
Stream IETF
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NTP Working Group                                              D. Sibold
Internet-Draft                                                       PTB
Intended status: Standards Track                             S. Roettger
Expires: December 29, 2013                                         TU-BS
                                                           June 27, 2013

                         Network Time Security
              draft-ietf-ntp-network-time-security-00.txt

Abstract

   This document describes the Network Time Security (NTS) protocol that
   enables secure authentication of time servers using Network Time
   Protocol (NTP) or Precision Time Protocol (PTP).  Its design
   considers the special requirements of precise timekeeping, which are
   described in Security Requirements of Time Protocols in Packet
   Switched Network [I-D.ietf-tictoc-security-requirements].

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 December 29, 2013.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Sibold & Roettger      Expires December 29, 2013                [Page 1]
Internet-Draft                    NTS                          June 2013

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Security Threats  . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Objectives  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Terms and Abbreviations . . . . . . . . . . . . . . . . . . .   4
   5.  NTS Overview  . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Symmetric and Client/Server Mode  . . . . . . . . . . . .   4
     5.2.  Broadcast Mode  . . . . . . . . . . . . . . . . . . . . .   4
   6.  Protocol Sequence . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Association Message . . . . . . . . . . . . . . . . . . .   5
     6.2.  Certificate Message . . . . . . . . . . . . . . . . . . .   5
     6.3.  Cookie Message  . . . . . . . . . . . . . . . . . . . . .   6
     6.4.  Broadcast Parameter Message . . . . . . . . . . . . . . .   6
     6.5.  Time Request Message  . . . . . . . . . . . . . . . . . .   6
     6.6.  Broadcast Message . . . . . . . . . . . . . . . . . . . .   6
     6.7.  Restart of the Protocol Sequence  . . . . . . . . . . . .   7
   7.  Hash Algorithms and MAC Generation  . . . . . . . . . . . . .   7
     7.1.  Hash Algorithms . . . . . . . . . . . . . . . . . . . . .   7
     7.2.  MAC Calculation . . . . . . . . . . . . . . . . . . . . .   8
   8.  Server Seed Considerations  . . . . . . . . . . . . . . . . .   8
     8.1.  Server Seed Algorithm . . . . . . . . . . . . . . . . . .   8
     8.2.  Server Seed Live Time . . . . . . . . . . . . . . . . . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   8
     10.1.  Initial Verification of the Server Certificates  . . . .   8
     10.2.  Revocation of Server Certificates  . . . . . . . . . . .   9
     10.3.  Denial-of-Service in Broadcast Mode  . . . . . . . . . .   9
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     12.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Appendix A.  TICTOC Security Requirements . . . . . . . . . . . .  10
   Appendix B.  Broadcast Mode . . . . . . . . . . . . . . . . . . .  11
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