Delegated Credentials for TLS
draft-ietf-tls-subcerts-02

Document Type Active Internet-Draft (tls WG)
Last updated 2018-08-17
Replaces draft-rescorla-tls-subcerts
Stream IETF
Intended RFC status Proposed Standard
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Network Working Group                                          R. Barnes
Internet-Draft                                                   Mozilla
Intended status: Standards Track                              S. Iyengar
Expires: February 18, 2019                                      Facebook
                                                             N. Sullivan
                                                              Cloudflare
                                                             E. Rescorla
                                                              RTFM, Inc.
                                                         August 17, 2018

                     Delegated Credentials for TLS
                       draft-ietf-tls-subcerts-02

Abstract

   The organizational separation between the operator of a TLS server
   and the certification authority can create limitations.  For example,
   the lifetime of certificates, how they may be used, and the
   algorithms they support are ultimately determined by the
   certification authority.  This document describes a mechanism by
   which operators may delegate their own credentials for use in TLS,
   without breaking compatibility with clients that do not support this
   specification.

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 February 18, 2019.

Copyright Notice

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

Barnes, et al.          Expires February 18, 2019               [Page 1]
Internet-Draft        Delegated Credentials for TLS          August 2018

   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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Change Log  . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Solution Overview . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Rationale . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Related Work  . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Delegated Credentials . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Client and Server behavior  . . . . . . . . . . . . . . .   8
     3.2.  Certificate Requirements  . . . . . . . . . . . . . . . .   9
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
     5.1.  Security of delegated private key . . . . . . . . . . . .  10
     5.2.  Revocation of delegated credentials . . . . . . . . . . .  10
     5.3.  Privacy considerations  . . . . . . . . . . . . . . . . .  10
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

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) [RFC8446] [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.  This allows server

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