Network Time Security
draft-ietf-ntp-network-time-security-02
NTP Working Group D. Sibold
Internet-Draft PTB
Intended status: Standards Track S. Roettger
Expires: August 18, 2014
K. Teichel
PTB
February 14, 2014
Network Time Security
draft-ietf-ntp-network-time-security-02.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 Networks [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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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 August 18, 2014.
Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved.
Sibold, et al. Expires August 18, 2014 [Page 1]
Internet-Draft NTS February 2014
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Security Threats . . . . . . . . . . . . . . . . . . . . . . 4
3. Objectives . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Terms and Abbreviations . . . . . . . . . . . . . . . . . . . 4
5. NTS Overview . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1. Symmetric and Client/Server Mode . . . . . . . . . . . . 5
5.2. Broadcast Mode . . . . . . . . . . . . . . . . . . . . . 5
6. Protocol Messages . . . . . . . . . . . . . . . . . . . . . . 6
6.1. Association Messages . . . . . . . . . . . . . . . . . . 6
6.1.1. Message type: "client_assoc" . . . . . . . . . . . . 6
6.1.2. Message type: "server_assoc" . . . . . . . . . . . . 6
6.2. Certificate Messages . . . . . . . . . . . . . . . . . . 7
6.2.1. Message type: "client_cert" . . . . . . . . . . . . . 7
6.2.2. Message type: "server_cert" . . . . . . . . . . . . . 7
6.3. Cookie Messages . . . . . . . . . . . . . . . . . . . . . 8
6.3.1. Message type: "client_cook" . . . . . . . . . . . . . 8
6.3.2. Message type: "server_cook" . . . . . . . . . . . . . 8
6.4. Unicast Time Synchronisation Messages . . . . . . . . . . 8
6.4.1. Message type: "time_request" . . . . . . . . . . . . 9
6.4.2. Message type: "time_response" . . . . . . . . . . . . 9
6.5. Broadcast Parameter Messages . . . . . . . . . . . . . . 9
6.5.1. Message type: "client_bpar" . . . . . . . . . . . . . 10
6.5.2. Message type: "server_bpar" . . . . . . . . . . . . . 10
6.6. Broadcast Message . . . . . . . . . . . . . . . . . . . . 10
6.6.1. Message type: "server_broad" . . . . . . . . . . . . 11
7. Protocol Sequence . . . . . . . . . . . . . . . . . . . . . . 11
7.1. The client . . . . . . . . . . . . . . . . . . . . . . . 11
7.1.1. The client in unicast mode . . . . . . . . . . . . . 11
7.1.2. The client in broadcast mode . . . . . . . . . . . . 12
7.2. The server . . . . . . . . . . . . . . . . . . . . . . . 13
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