Delegated Credentials for TLS
draft-rescorla-tls-subcerts-01

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Last updated 2017-04-12 (latest revision 2017-03-09)
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Network Working Group                                          R. Barnes
Internet-Draft                                                   Mozilla
Intended status: Standards Track                              S. Iyengar
Expires: September 9, 2017                                      Facebook
                                                             N. Sullivan
                                                              Cloudflare
                                                             E. Rescorla
                                                              RTFM, Inc.
                                                          March 08, 2017

                     Delegated Credentials for TLS
                     draft-rescorla-tls-subcerts-01

Abstract

   The organizational separation between the operator of a TLS server
   and the certificate authority that provides it credentials can cause
   problems, for example when it comes to reducing the lifetime of
   certificates or supporting new cryptographic algorithms.  This
   document describes a mechanism to allow TLS server operators to
   create their own credential delegations without breaking
   compatibility with clients that do not support this specification.

Status of This Memo

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   This Internet-Draft will expire on September 9, 2017.

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   Copyright (c) 2017 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

Barnes, et al.          Expires September 9, 2017               [Page 1]
Internet-Draft        Delegated Credentials for TLS           March 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Solution Overview . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Related Work  . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Client and Server behavior  . . . . . . . . . . . . . . . . .   5
   5.  Delegated Credentials . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Certificate Requirements  . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Typically, a TLS server uses a certificate provided by some entity
   other than the operator of the server (a "Certification Authority" or
   CA) [RFC5246] [RFC5280].  This organizational separation makes the
   TLS server operator dependent on the CA for some aspects of its
   operations, for example:

   o  Whenever the server operator wants to deploy a new certificate, it
      has to interact with the CA.

   o  The server operator can only use TLS authentication schemes for
      which the CA will issue credentials.

   These dependencies cause problems in practice.  Server operators
   often want to create short-lived certificates for servers in low-
   trust zones such as CDNs or remote data centers.  The risk inherent
   in cross-organizational transactions makes it infeasible to rely on
   an external CA for such short-lived credentials.

   To remove these dependencies, this document proposes a limited
   delegation mechanism that allows a TLS server operator to issue its
   own credentials within the scope of a certificate issued by an
   external CA.  Because the above problems do not relate to the CAs
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