OCSP Nonce Extension
draft-msahni-lamps-ocsp-nonce-02

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LAMPS                                                      M. Sahni, Ed.
Internet-Draft                                        Palo Alto Networks
Intended status: Standards Track                          March 18, 2020
Expires: September 19, 2020

                          OCSP Nonce Extension
                    draft-msahni-lamps-ocsp-nonce-02

Abstract

   This document specifies the updated format of the Nonce extension in
   Online Certificate Status Protocol (OCSP) request and response
   messages.  OCSP is used to check the status of a certificate and the
   Nonce extension is used in the OCSP request and response messages to
   avoid replay attacks.  This document updates the RFC 6960

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on September 19, 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  OCSP Extensions . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Nonce Extension . . . . . . . . . . . . . . . . . . . . .   3
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
     3.1.  Replay Attack . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Nonce Collision . . . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Changes to Appendix B. of RFC 6960  . . . . . . . . . . . . .   4
     5.1.  Changes to Appendix B.1. OCSP in ASN.1 - 1998 Syntax  . .   4
     5.2.  Changes to Appendix B.2 OCSP in ASN.1 - 2008 Syntax . . .   5
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   6
     6.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   This document updates the usage and format of the Nonce extension
   used in OCSP request and response messages.  This extension was
   previously defined in the section 4.1.1 of [RFC6960].  The [RFC6960]
   does not mention any minimum and maximum length of the nonce
   extension.  Due to not having an upper or lower limit of the length
   of the Nonce extension, the OCSP responders that follow [RFC6960] may
   be vulnerable to various attacks like Denial of Service attacks
   [RFC4732], chosen prefix attacks to get a desired signature from the
   OCSP responder and possible evasions that can use the Nonce extension
   data for evasion.  This document specifies a lower limit of 1 and
   upper limit of 32 to the length of the Nonce extension.  This
   document updates the [RFC6960].

1.1.  Terminology

   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.

2.  OCSP Extensions

   The message format for the OCSP request and response is defined in
   the [RFC6960].  It also defines the standard extensions for OCSP
   messages based on the extension model employed in X.509 version 3
   certificates (see [RFC5280]).  Following is the list of standard

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