Network Time Security for the Network Time Protocol
draft-ietf-ntp-using-nts-for-ntp-09

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Last updated 2017-06-26
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NTP Working Group                                              D. Franke
Internet-Draft                                                    Akamai
Intended status: Standards Track                               D. Sibold
Expires: December 28, 2017                                    K. Teichel
                                                                     PTB
                                                           June 26, 2017

          Network Time Security for the Network Time Protocol
                  draft-ietf-ntp-using-nts-for-ntp-09

Abstract

   This memo specifies Network Time Security (NTS), a mechanism for
   using Transport Layer Security (TLS) and Authenticated Encryption
   with Associated Data (AEAD) to provide cryptographic security for the
   Network Time Protocol.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 28, 2017.

Copyright Notice

   Copyright (c) 2017 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of

Franke, et al.          Expires December 28, 2017               [Page 1]
Internet-Draft                   NTS4NTP                       June 2017

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Objectives  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Protocol overview . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  TLS profile for Network Time Security . . . . . . . . . . . .   5
   4.  The NTS-encapsulated NTPv4 protocol . . . . . . . . . . . . .   6
   5.  The NTS Key Establishment protocol  . . . . . . . . . . . . .   8
     5.1.  NTS-KE record types . . . . . . . . . . . . . . . . . . .   9
       5.1.1.  End of Message  . . . . . . . . . . . . . . . . . . .   9
       5.1.2.  NTS Next Protocol Negotiation . . . . . . . . . . . .   9
       5.1.3.  Error . . . . . . . . . . . . . . . . . . . . . . . .   9
       5.1.4.  Warning . . . . . . . . . . . . . . . . . . . . . . .  10
       5.1.5.  AEAD Algorithm Negotiation  . . . . . . . . . . . . .  10
       5.1.6.  New Cookie for NTPv4  . . . . . . . . . . . . . . . .  11
     5.2.  Key Extraction (generally)  . . . . . . . . . . . . . . .  11
   6.  NTS Extensions for NTPv4  . . . . . . . . . . . . . . . . . .  11
     6.1.  Key Extraction (for NTPv4)  . . . . . . . . . . . . . . .  11
     6.2.  Packet structure overview . . . . . . . . . . . . . . . .  12
     6.3.  The Unique Identifier extension . . . . . . . . . . . . .  13
     6.4.  The NTS Cookie extension  . . . . . . . . . . . . . . . .  13
     6.5.  The NTS Cookie Placeholder extension  . . . . . . . . . .  13
     6.6.  The NTS Authenticator and Encrypted Extensions extension   14
     6.7.  Protocol details  . . . . . . . . . . . . . . . . . . . .  15
   7.  Recommended format for NTS cookies  . . . . . . . . . . . . .  17
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   9.  Security considerations . . . . . . . . . . . . . . . . . . .  22
     9.1.  Avoiding DDoS amplification . . . . . . . . . . . . . . .  22
     9.2.  Initial verification of server certificates . . . . . . .  22
     9.3.  Usage of NTP pools  . . . . . . . . . . . . . . . . . . .  23
     9.4.  Delay attacks . . . . . . . . . . . . . . . . . . . . . .  24
     9.5.  Random number generation  . . . . . . . . . . . . . . . .  24
   10. Privacy Considerations  . . . . . . . . . . . . . . . . . . .  24
     10.1.  Unlinkability  . . . . . . . . . . . . . . . . . . . . .  24
     10.2.  Confidentiality  . . . . . . . . . . . . . . . . . . . .  25
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