Considerations For Using Short Term Certificates
draft-nir-saag-star-01

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SecDispatch                                                       Y. Nir
Internet-Draft                                                  Dell EMC
Intended status: Informational                                T. Fossati
Expires: September 6, 2018                                         Nokia
                                                              Y. Sheffer
                                                                  Intuit
                                                               T. Eckert
                                                                  Huawei
                                                           March 5, 2018

            Considerations For Using Short Term Certificates
                         draft-nir-saag-star-01

Abstract

   Recently there has been renewed interest in an old idea: Issue
   certificates with short validity periods and forego revocation
   processing, reasoning that expiration is a sufficient replacement for
   revocation as long as that expiration is not too far off.

   This document covers considerations, both security and operational,
   for using such Short Term Auto Renewed (STAR) certificates for
   various scenarios where Using a revocation protocol is considered
   inappropriate.

Status of This Memo

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

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   This Internet-Draft will expire on September 6, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Nir, et al.             Expires September 6, 2018               [Page 1]
Internet-Draft              STAR Certificates                 March 2018

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
   2.  Short Term Auto Renewed Certificates  . . . . . . . . . . . .   4
     2.1.  Alternative Design: OCSP Stapling . . . . . . . . . . . .   5
     2.2.  The Case For Foregoing Revocation . . . . . . . . . . . .   5
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Data Center Network Hosts . . . . . . . . . . . . . . . .   6
     3.2.  Distributed System Installed in One Or More Data Centers    6
       3.2.1.  Distributed Network Security Functions  . . . . . . .   6
     3.3.  Certificate Delegation for Content Delivery Networks  . .   6
     3.4.  Autonomic Networking Infrastructure . . . . . . . . . . .   6
   4.  Operational Considerations  . . . . . . . . . . . . . . . . .   7
     4.1.  Certificate Lifetime and Renewal Schedule . . . . . . . .   7
     4.2.  Availability of the Certificate Authority . . . . . . . .   8
     4.3.  Clock Skew and the notBefore Field  . . . . . . . . . . .   9
     4.4.  Automatic Renewal . . . . . . . . . . . . . . . . . . . .  10
     4.5.  Secure (Re-)Enrollments . . . . . . . . . . . . . . . . .  10
     4.6.  Future enhancements for renewal/re-enrollment . . . . . .  11
     4.7.  Certificate Transparency  . . . . . . . . . . . . . . . .  12
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
     5.1.  Reasons for Revocation  . . . . . . . . . . . . . . . . .  13
     5.2.  Longevity and Revocation  . . . . . . . . . . . . . . . .  14
     5.3.  Clock Skew and Security . . . . . . . . . . . . . . . . .  14
     5.4.  CA availability . . . . . . . . . . . . . . . . . . . . .  15
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction
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