Roughtime
draft-roughtime-aanchal-04

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Internet Engineering Task Force                              A. Malhotra
Internet-Draft                                         Boston University
Intended status: Informational                                A. Langley
Expires: July 23, 2020                                            Google
                                                                 W. Ladd
                                                              Cloudflare
                                                        January 20, 2020

                               Roughtime
                       draft-roughtime-aanchal-04

Abstract

   This document specifies Roughtime - a protocol that aims to achieve
   rough time synchronization while detecting servers that provide
   inaccurate time and providing cryptographic proof of their
   malfeasance.

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
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   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 July 23, 2020.

Copyright Notice

   Copyright (c) 2020 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

Malhotra, et al.          Expires July 23, 2020                 [Page 1]
Internet-Draft                  Roughtime                   January 2020

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
   4.  The guarantee . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Message Format  . . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Data Types  . . . . . . . . . . . . . . . . . . . . . . .   6
       5.1.1.  uint32  . . . . . . . . . . . . . . . . . . . . . . .   6
       5.1.2.  uint64  . . . . . . . . . . . . . . . . . . . . . . .   6
       5.1.3.  Tag . . . . . . . . . . . . . . . . . . . . . . . . .   6
       5.1.4.  Timestamp . . . . . . . . . . . . . . . . . . . . . .   7
     5.2.  Header  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Protocol  . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Requests  . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.2.  Responses . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.3.  The Merkle Tree . . . . . . . . . . . . . . . . . . . . .   9
       6.3.1.  Root value validity check algorithm . . . . . . . . .  10
     6.4.  Validity of response  . . . . . . . . . . . . . . . . . .  10
   7.  Integration into ntp  . . . . . . . . . . . . . . . . . . . .  10
   8.  Cheater Detection . . . . . . . . . . . . . . . . . . . . . .  11
   9.  Grease  . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   10. Roughtime Servers . . . . . . . . . . . . . . . . . . . . . .  12
   11. Trust anchors and policies  . . . . . . . . . . . . . . . . .  12
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   13. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
     13.1.  Service Name and Transport Protocol Port Number Registry  13
     13.2.  Roughtime Tag Registry . . . . . . . . . . . . . . . . .  13
   14. Security Considerations . . . . . . . . . . . . . . . . . . .  14
   15. Privacy Considerations  . . . . . . . . . . . . . . . . . . .  15
   16. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     16.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     16.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Appendix A.  Terms and Abbreviations  . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   Time synchronization is essential to Internet security as many
   security protocols and other applications require synchronization
   [RFC7384] [MCBG].  Unfortunately widely deployed protocols such as