Network Time Security
draft-ietf-ntp-network-time-security-08
NTP Working Group D. Sibold
Internet-Draft PTB
Intended status: Standards Track S. Roettger
Expires: September 6, 2015 Google Inc.
K. Teichel
PTB
March 5, 2015
Network Time Security
draft-ietf-ntp-network-time-security-08.txt
Abstract
This document describes Network Time Security (NTS), a collection of
measures that enable secure time synchronization with time servers
using protocols like the Network Time Protocol (NTP) or the 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 Networks [RFC7384].
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 September 6, 2015.
Sibold, et al. Expires September 6, 2015 [Page 1]
Internet-Draft NTS March 2015
Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Terms and Abbreviations . . . . . . . . . . . . . . . . . 4
2.2. Common Terminology for PTP and NTP . . . . . . . . . . . 4
3. Security Threats . . . . . . . . . . . . . . . . . . . . . . 4
4. Objectives . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. NTS Overview . . . . . . . . . . . . . . . . . . . . . . . . 5
6. Protocol Messages . . . . . . . . . . . . . . . . . . . . . . 6
6.1. Association Message Exchange . . . . . . . . . . . . . . 7
6.1.1. Goals of the Association Exchange . . . . . . . . . . 7
6.1.2. Message Type: "client_assoc" . . . . . . . . . . . . 7
6.1.3. Message Type: "server_assoc" . . . . . . . . . . . . 8
6.1.4. Procedure Overview of the Association Exchange . . . 8
6.2. Cookie Messages . . . . . . . . . . . . . . . . . . . . . 9
6.2.1. Goals of the Cookie Exchange . . . . . . . . . . . . 10
6.2.2. Message Type: "client_cook" . . . . . . . . . . . . . 10
6.2.3. Message Type: "server_cook" . . . . . . . . . . . . . 10
6.2.4. Procedure Overview of the Cookie Exchange . . . . . . 11
6.3. Unicast Time Synchronisation Messages . . . . . . . . . . 12
6.3.1. Goals of the Unicast Time Synchronization Exchange . 12
6.3.2. Message Type: "time_request" . . . . . . . . . . . . 12
6.3.3. Message Type: "time_response" . . . . . . . . . . . . 13
6.3.4. Procedure Overview of the Unicast Time
Synchronization Exchange . . . . . . . . . . . . . . 13
6.4. Broadcast Parameter Messages . . . . . . . . . . . . . . 14
6.4.1. Goals of the Broadcast Parameter Exchange . . . . . . 15
6.4.2. Message Type: "client_bpar" . . . . . . . . . . . . . 15
6.4.3. Message Type: "server_bpar" . . . . . . . . . . . . . 15
6.4.4. Procedure Overview of the Broadcast Parameter
Exchange . . . . . . . . . . . . . . . . . . . . . . 16
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