Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Certificate Handling
RFC 8550
| Document | Type |
RFC - Proposed Standard
(April 2019; No errata)
Obsoletes RFC 5750
|
|
|---|---|---|---|
| Last updated | 2019-04-30 | ||
| Replaces | draft-schaad-lamps-rfc5750-bis | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Russ Housley | ||
| Shepherd write-up | Show (last changed 2017-04-14) | ||
| IESG | IESG state | RFC 8550 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Eric Rescorla | ||
| Send notices to | Russ Housley <housley@vigilsec.com> | ||
| IANA | IANA review state | IANA OK - No Actions Needed | |
| IANA action state | No IANA Actions | ||
Internet Engineering Task Force (IETF) J. Schaad
Request for Comments: 8550 August Cellars
Obsoletes: 5750 B. Ramsdell
Category: Standards Track Brute Squad Labs, Inc.
ISSN: 2070-1721 S. Turner
sn3rd
April 2019
Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0
Certificate Handling
Abstract
This document specifies conventions for X.509 certificate usage by
Secure/Multipurpose Internet Mail Extensions (S/MIME) v4.0 agents.
S/MIME provides a method to send and receive secure MIME messages,
and certificates are an integral part of S/MIME agent processing.
S/MIME agents validate certificates as described in RFC 5280
("Internet X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile"). S/MIME agents must meet
the certificate-processing requirements in this document as well as
those in RFC 5280. This document obsoletes RFC 5750.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8550.
Schaad, et al. Standards Track [Page 1]
RFC 8550 S/MIME 4.0 Certificate Handling April 2019
Copyright Notice
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Schaad, et al. Standards Track [Page 2]
RFC 8550 S/MIME 4.0 Certificate Handling April 2019
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. Conventions Used in This Document . . . . . . . . . . . . 5
1.3. Compatibility with Prior Practice of S/MIME . . . . . . . 6
1.4. Changes from S/MIME v3 to S/MIME v3.1 . . . . . . . . . . 6
1.5. Changes from S/MIME v3.1 to S/MIME v3.2 . . . . . . . . . 7
1.6. Changes since S/MIME 3.2 . . . . . . . . . . . . . . . . 8
2. CMS Options . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1. Certificate Revocation Lists . . . . . . . . . . . . . . 9
2.2. Certificate Choices . . . . . . . . . . . . . . . . . . . 9
2.2.1. Historical Note about CMS Certificates . . . . . . . 9
2.3. Included Certificates . . . . . . . . . . . . . . . . . . 10
3. Using Distinguished Names for Internet Mail . . . . . . . . . 11
4. Certificate Processing . . . . . . . . . . . . . . . . . . . 12
4.1. Certificate Revocation Lists . . . . . . . . . . . . . . 13
4.2. Certificate Path Validation . . . . . . . . . . . . . . . 13
4.3. Certificate and CRL Signing Algorithms, and Key Sizes . . 14
4.4. PKIX Certificate Extensions . . . . . . . . . . . . . . . 15
4.4.1. Basic Constraints . . . . . . . . . . . . . . . . . . 16
4.4.2. Key Usage Extension . . . . . . . . . . . . . . . . . 16
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