Roughtime
draft-roughtime-aanchal-00
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Internet Engineering Task Force A. Malhotra
Internet-Draft Boston University
Intended status: Informational A. Langly
Expires: August 12, 2019 Google
W. Ladd
Cloudflare
February 8, 2019
Roughtime
draft-roughtime-aanchal-00
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
working documents as Internet-Drafts. The list of current Internet-
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 August 12, 2019.
Copyright Notice
Copyright (c) 2019 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 August 12, 2019 [Page 1]
Internet-Draft Roughtime February 2019
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
1. Motivation
Time synchronization is essential to Internet security as many
security protocols and other applications require synchronization
[RFC7384][MCBG]. Unfortunately widely deployed protocols such as the
Network Time Protocol (NTP) [RFC5905] lack essential security
features, and even newer protocols like Network Time Security (NTS)
[I-D.ietf-ntp-using-nts-for-ntp] fail to ensure that the servers
behave correctly. Authenticating time servers prevents network
adversaries from modifying time packets. An authenticated time
server still has full control over the contents of time packet and
may go rogue. Roughtime protocol provides cryptographic proof of
malfeasance, enabling clients to detect and prove to a third party
server's attempts to influence the time a client computes.
+--------------+----------------------+-----------------------------+
| Protocol | Authenticated Server | Server Malfeasance Evidence |
+--------------+----------------------+-----------------------------+
| NTP, Chronos | N | N |
| NTP-MD5 | Y* | N |
| NTP-Autokey | Y** | N |
| NTS | Y | N |
| Roughtime | Y | Y |
+--------------+----------------------+-----------------------------+
Security Properties of current protocols
Table 1
Y* For security issues with symmetric-key based NTP-MD5
authentication, please refer to Message Authentication Code for the
Network Time Protocol draft [I-D.ietf-ntp-mac]
Y** For security issues with Autokey Public Key Authentication, refer
to [Autokey]
2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Malhotra, et al. Expires August 12, 2019 [Page 2]
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3. Protocol Overview
Roughtime is a protocol for rough time synchronization that enables
clients to provide cryptographic proof of server malfeasance. It
does so by having responses from servers include a signature with a
certificate rooted in long term public/private key pair over a
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