Delegated Credentials for TLS
draft-ietf-tls-subcerts-04
Network Working Group R. Barnes
Internet-Draft Cisco
Intended status: Standards Track S. Iyengar
Expires: January 9, 2020 Facebook
N. Sullivan
Cloudflare
E. Rescorla
RTFM, Inc.
July 08, 2019
Delegated Credentials for TLS
draft-ietf-tls-subcerts-04
Abstract
The organizational separation between the operator of a TLS endpoint
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 peers that do not support this
specification.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on January 9, 2020.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
Barnes, et al. Expires January 9, 2020 [Page 1]
Internet-Draft Delegated Credentials for TLS July 2019
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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
3.1.1. Server authentication . . . . . . . . . . . . . . . . 8
3.1.2. Client authentication . . . . . . . . . . . . . . . . 9
3.1.3. Validating a Delegated Credential . . . . . . . . . . 9
3.2. Certificate Requirements . . . . . . . . . . . . . . . . 10
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
5. Security Considerations . . . . . . . . . . . . . . . . . . . 10
5.1. Security of delegated private key . . . . . . . . . . . . 10
5.2. Re-use of delegated credentials in multiple contexts . . 11
5.3. Revocation of delegated credentials . . . . . . . . . . . 11
5.4. Privacy considerations . . . . . . . . . . . . . . . . . 11
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 11
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1. Normative References . . . . . . . . . . . . . . . . . . 11
7.2. Informative References . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13
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.
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