Network Time Security for the Network Time Protocol
draft-ietf-ntp-using-nts-for-ntp-14

Document Type Active Internet-Draft (ntp WG)
Last updated 2018-11-06 (latest revision 2018-10-22)
Stream IETF
Intended RFC status (None)
Formats plain text xml pdf html bibtex
Stream WG state In WG Last Call (wg milestone: Feb 2016 - WGLC for Using the N... )
Document shepherd Karen O'Donoghue
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to Karen O'Donoghue <odonoghue@isoc.org>
NTP Working Group                                              D. Franke
Internet-Draft                                                    Akamai
Intended status: Standards Track                               D. Sibold
Expires: April 25, 2019                                       K. Teichel
                                                                     PTB
                                                             M. Dansarie

                                                             R. Sundblad
                                                                  Netnod
                                                        October 22, 2018

          Network Time Security for the Network Time Protocol
                  draft-ietf-ntp-using-nts-for-ntp-14

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
   client-server mode of the Network Time Protocol (NTP).

   NTS is structured as a suite of two loosely coupled sub-protocols.
   The first (NTS-KE) handles initial authentication and key
   establishment over TLS.  The second handles encryption and
   authentication during NTP time via extension fields in the NTP
   packets, and holds all required state only on the client via opaque
   cookies.

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 https://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 April 25, 2019.

Franke, et al.           Expires April 25, 2019                 [Page 1]
Internet-Draft                   NTS4NTP                    October 2018

Copyright Notice

   Copyright (c) 2018 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
   (https://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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Objectives  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Protocol Overview . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   6
   3.  TLS profile for Network Time Security . . . . . . . . . . . .   7
   4.  The NTS Key Establishment Protocol  . . . . . . . . . . . . .   7
     4.1.  NTS-KE Record Types . . . . . . . . . . . . . . . . . . .   9
       4.1.1.  End of Message  . . . . . . . . . . . . . . . . . . .   9
       4.1.2.  NTS Next Protocol Negotiation . . . . . . . . . . . .  10
       4.1.3.  Error . . . . . . . . . . . . . . . . . . . . . . . .  10
       4.1.4.  Warning . . . . . . . . . . . . . . . . . . . . . . .  10
       4.1.5.  AEAD Algorithm Negotiation  . . . . . . . . . . . . .  11
       4.1.6.  New Cookie for NTPv4  . . . . . . . . . . . . . . . .  11
       4.1.7.  NTPv4 Server Negotiation  . . . . . . . . . . . . . .  12
       4.1.8.  NTPv4 Port Negotiation  . . . . . . . . . . . . . . .  12
     4.2.  Key Extraction (generally)  . . . . . . . . . . . . . . .  13
   5.  NTS Extension Fields for NTPv4  . . . . . . . . . . . . . . .  13
     5.1.  Key Extraction (for NTPv4)  . . . . . . . . . . . . . . .  13
     5.2.  Packet Structure Overview . . . . . . . . . . . . . . . .  14
     5.3.  The Unique Identifier Extension Field . . . . . . . . . .  14
     5.4.  The NTS Cookie Extension Field  . . . . . . . . . . . . .  15
     5.5.  The NTS Cookie Placeholder Extension Field  . . . . . . .  15
     5.6.  The NTS Authenticator and Encrypted Extension Fields
           Extension Field . . . . . . . . . . . . . . . . . . . . .  15
     5.7.  Protocol Details  . . . . . . . . . . . . . . . . . . . .  17
   6.  Suggested Format for NTS Cookies  . . . . . . . . . . . . . .  22
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  23
     7.1.  Service Name and Transport Protocol Port Number Registry   23
Show full document text