Security Requirements of Time Protocols in Packet Switched Networks
draft-ietf-tictoc-security-requirements-05

TICTOC Working Group                                         Tal Mizrahi
Internet Draft                                                   Marvell
Intended status: Informational
Expires: October 2013                                     April 25, 2013

                  Security Requirements of Time Protocols
                        in Packet Switched Networks
              draft-ietf-tictoc-security-requirements-05.txt

Abstract

   As time and frequency distribution 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 protocols, focusing on the
   Precision Time Protocol (PTP) and the Network Time Protocol (NTP).
   This document also discusses the security impacts of time protocol
   practices, the performance implications of external security
   practices on time protocols and 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
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   This Internet-Draft will expire on October 25, 2013.

Tal Mizrahi           Expires October 25, 2013                [Page 1]
Internet-Draft   Time Protocol Security Requirements        April 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
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   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 ............................. 6
   3. Security Threats ............................................. 7
      3.1. Threat Model ............................................ 7
         3.1.1. Internal vs. External Attackers .................... 7
         3.1.2. Man in the Middle (MITM) vs. Packet Injector ....... 8
      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. L2/L3 DoS Attacks .................................. 9
         3.2.8. Cryptographic Performance Attacks .................. 9
         3.2.9. DoS Attacks against the Time Protocol ............. 10
         3.2.10. Grandmaster Time Source Attack (e.g., GPS fraud) . 10
      3.3. Threat Analysis Summary ................................ 10
   4. Requirement Levels .......................................... 12
   5. Security Requirements ....................................... 12
      5.1. Clock Identity Authentication and Authorization ........ 13
         5.1.1. Authentication and Authorization of Masters ....... 14
         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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