An ACME Profile for Generating Delegated STAR Certificates
draft-ietf-acme-star-delegation-03

Document Type Active Internet-Draft (acme WG)
Last updated 2020-03-08
Replaces draft-sheffer-acme-star-delegation
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ACME                                                          Y. Sheffer
Internet-Draft                                                    Intuit
Intended status: Standards Track                                D. Lopez
Expires: 9 September 2020                              A. Pastor Perales
                                                          Telefonica I+D
                                                              T. Fossati
                                                                     ARM
                                                            8 March 2020

       An ACME Profile for Generating Delegated STAR Certificates
                   draft-ietf-acme-star-delegation-03

Abstract

   This memo proposes a profile of the ACME protocol that allows the
   owner of an identifier (e.g., a domain name) to delegate to a third
   party access to a certificate associated with said identifier.  A
   primary use case is that of a CDN (the third party) terminating TLS
   sessions on behalf of a content provider (the owner of a domain
   name).  The presented mechanism allows the owner of the identifier to
   retain control over the delegation and revoke it at any time by
   cancelling the associated STAR certificate renewal with the ACME CA.
   Another key property of this mechanism is it does not require any
   modification to the deployed TLS ecosystem.

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
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   This Internet-Draft will expire on 9 September 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Sheffer, et al.         Expires 9 September 2020                [Page 1]
Internet-Draft            ACME STAR Delegation                March 2020

   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
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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Conventions used in this document . . . . . . . . . . . .   4
   2.  Protocol Flow . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Preconditions . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Delegated Identity Profile  . . . . . . . . . . . . . . .   6
       2.3.1.  Order Object on the NDC-IdO side  . . . . . . . . . .   7
       2.3.2.  Order Object on the IdO-CA side . . . . . . . . . . .   9
       2.3.3.  Capability Discovery  . . . . . . . . . . . . . . . .   9
       2.3.4.  On Cancellation . . . . . . . . . . . . . . . . . . .  10
     2.4.  Proxy Behavior  . . . . . . . . . . . . . . . . . . . . .  10
   3.  CSR Template  . . . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Template Syntax . . . . . . . . . . . . . . . . . . . . .  11
     3.2.  Example . . . . . . . . . . . . . . . . . . . . . . . . .  12
   4.  Further Use Cases . . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  CDNI  . . . . . . . . . . . . . . . . . . . . . . . . . .  13
       4.1.1.  Multiple Parallel Delegates . . . . . . . . . . . . .  13
       4.1.2.  Chained Delegation  . . . . . . . . . . . . . . . . .  13
     4.2.  STIR  . . . . . . . . . . . . . . . . . . . . . . . . . .  16
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
     5.1.  New Fields in the "auto-renewal" Object within a
           Directory Metadata Object . . . . . . . . . . . . . . . .  17
     5.2.  New Fields for Identifiers  . . . . . . . . . . . . . . .  18
     5.3.  CSR Template Registry . . . . . . . . . . . . . . . . . .  18
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
     6.1.  Restricting CDNs to the Delegation Mechanism  . . . . . .  18
     6.2.  TBC . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
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