Security Requirements of Time Synchronization Protocols in Packet Switched Networks
draft-ietf-tictoc-security-requirements-04

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Document Type Active Internet-Draft (tictoc WG)
Author Tal Mizrahi 
Last updated 2013-02-07
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TICTOC Working Group                                         Tal Mizrahi
Internet Draft                                                   Marvell
Intended status: Informational
Expires: August 2013                                    February 7, 2013

          Security Requirements of Time Synchronization Protocols
                        in Packet Switched Networks
              draft-ietf-tictoc-security-requirements-04.txt

Abstract

   As time synchronization protocols are becoming increasingly common
   and widely deployed, concern about their exposure to various security
   threats is increasing. This document defines a set of security
   requirements for time synchronization protocols, focusing on the
   Precision Time Protocol (PTP) and the Network Time Protocol (NTP).
   This document also discusses the security impacts of time
   synchronization protocol practices, the time synchronization
   performance implications of external security practices, the
   dependencies between other security services and time
   synchronization.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
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   Drafts.

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   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on August 7, 2013.

Tal Mizrahi            Expires August 7, 2013                 [Page 1]
Internet-Draft   Time Protocol Security Requirements      February 2013

Copyright Notice

   Copyright (c) 2013 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
   (http://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
   2. Conventions Used in this Document ............................ 5
      2.1. Terminology ............................................. 5
      2.2. Abbreviations ........................................... 5
      2.3. Common Terminology for PTP and NTP ...................... 5
      2.4. Terms used in this Document ............................. 5
   3. Security Threats ............................................. 6
      3.1. Threat Model ............................................ 7
         3.1.1. Internal vs. External Attackers .................... 7
         3.1.2. Man in the Middle (MITM) vs. Packet Injector ....... 7
      3.2. Threat Analysis.......................................... 8
         3.2.1. Packet Interception and Manipulation ............... 8
         3.2.2. Spoofing ........................................... 8
         3.2.3. Replay Attack ...................................... 8
         3.2.4. Rogue Master Attack ................................ 8
         3.2.5. Packet Interception and Removal .................... 9
         3.2.6. Packet Delay Manipulation .......................... 9
         3.2.7. Cryptographic Performance Attacks .................. 9
         3.2.8. L2/L3 DoS Attacks .................................. 9
         3.2.9. DoS Attacks against the Time Protocol .............. 9
         3.2.10. Grandmaster Time Source Spoofing (e.g. GPS fraud) . 9
      3.3. Threat Analysis Summary ................................ 10
   4. Requirement Levels .......................................... 11
   5. Security Requirements ....................................... 12
      5.1. Clock Identity Authentication and Authorization ........ 12
         5.1.1. Authentication and Authorization of Masters ....... 13
         5.1.2. Recursive Authentication and Authorization of Masters
         (Chain of Trust) ......................................... 14
         5.1.3. Authentication and Authorization of Slaves ........ 15

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