Delegated Credentials for TLS
draft-ietf-tls-subcerts-10
Network Working Group R. Barnes
Internet-Draft Cisco
Intended status: Standards Track S. Iyengar
Expires: 28 July 2021 Facebook
N. Sullivan
Cloudflare
E. Rescorla
Mozilla
24 January 2021
Delegated Credentials for TLS
draft-ietf-tls-subcerts-10
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.
Discussion Venues
This note is to be removed before publishing as an RFC.
Source for this draft and an issue tracker can be found at
https://github.com/tlswg/tls-subcerts (https://github.com/tlswg/tls-
subcerts).
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."
Barnes, et al. Expires 28 July 2021 [Page 1]
Internet-Draft Delegated Credentials for TLS January 2021
This Internet-Draft will expire on 28 July 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 3
2.1. Change Log . . . . . . . . . . . . . . . . . . . . . . . 4
3. Solution Overview . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Rationale . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2. Related Work . . . . . . . . . . . . . . . . . . . . . . 7
4. Delegated Credentials . . . . . . . . . . . . . . . . . . . . 8
4.1. Client and Server Behavior . . . . . . . . . . . . . . . 10
4.1.1. Server Authentication . . . . . . . . . . . . . . . . 10
4.1.2. Client Authentication . . . . . . . . . . . . . . . . 10
4.1.3. Validating a Delegated Credential . . . . . . . . . . 11
4.2. Certificate Requirements . . . . . . . . . . . . . . . . 12
5. Operational Considerations . . . . . . . . . . . . . . . . . 12
5.1. Client Clock Skew . . . . . . . . . . . . . . . . . . . . 13
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13
7.1. Security of Delegated Credential's Private Key . . . . . 13
7.2. Re-use of Delegated Credentials in Multiple
Contexts . . . . . . . . . . . . . . . . . . . . . . . . 14
7.3. Revocation of Delegated Credentials . . . . . . . . . . . 14
7.4. Interactions with Session Resumption . . . . . . . . . . 14
7.5. Privacy Considerations . . . . . . . . . . . . . . . . . 14
7.6. The Impact of Signature Forgery Attacks . . . . . . . . . 14
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 15
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 15
9.1. Normative References . . . . . . . . . . . . . . . . . . 15
9.2. Informative References . . . . . . . . . . . . . . . . . 16
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