rfc2797.txt
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Network Working Group M. Myers
Request for Comments: 2797 VeriSign
Category: Standards Track X. Liu
Cisco
J. Schaad
Microsoft
J. Weinstein
April 2000
Certificate Management Messages over CMS
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
This document defines a Certificate Management protocol using CMS
(CMC). This protocol addresses two immediate needs within the
Internet PKI community:
1. The need for an interface to public key certification products and
services based on [CMS] and [PKCS10], and
2. The need in [SMIMEV3] for a certificate enrollment protocol for
DSA-signed certificates with Diffie-Hellman public keys.
A small number of additional services are defined to supplement the
core certificate request service.
Throughout this specification the term CMS is used to refer to both
[CMS] and [PKCS7]. For both signedData and envelopedData, CMS is a
superset of the PKCS7. In general, the use of PKCS7 in this document
is aligned to the Cryptographic Message Syntax [CMS] that provides a
superset of the PKCS7 syntax. The term CMC refers to this
specification.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC 2119].
Myers, et al. Standards Track [Page 1]
RFC 2797 Certificate Management Messages over CMS April 2000
1. Protocol Requirements
- The protocol is to be based as much as possible on the existing
CMS, PKCS#10 and CRMF specifications.
- The protocol must support the current industry practice of a
PKCS#10 request followed by a PKCS#7 response as a subset of the
protocol.
- The protocol needs to easily support the multi-key enrollment
protocols required by S/MIME and other groups.
- The protocol must supply a way of doing all operations in a
single-round trip. When this is not possible the number of round
trips is to be minimized.
- The protocol will be designed such that all key generation can
occur on the client.
- The mandatory algorithms must superset the required algorithms for
S/MIME.
- The protocol will contain POP methods. Optional provisions for
multiple-round trip POP will be made if necessary.
- The protocol will support deferred and pending responses to
certificate request for cases where external procedures are
required to issue a certificate.
- The protocol needs to support arbitrary chains of local
registration authorities as intermediaries between certificate
requesters and issuers.
2. Protocol Overview
An enrollment transaction in this specification is generally composed
of a single round trip of messages. In the simplest case an
enrollment request is sent from the client to the server and an
enrollment response is then returned from the server to the client.
In some more complicated cases, such as delayed certificate issuance
and polling for responses, more than one round trip is required.
This specification supports two different request messages and two
different response messages.
Public key certification requests can be based on either the PKCS10
or CRMF object. The two different request messages are (a) the bare
PKCS10 (in the event that no other services are needed), and (b) the
PKCS10 or CRMF message wrapped in a CMS encapsulation as part of a
PKIData object.
Public key certification responses are based on the CMS signedData
object. The response may be either (a) a degenerate CMS signedData
object (in the event no other services are needed), or (b) a
ResponseBody object wrapped in a CMS signedData object.
Myers, et al. Standards Track [Page 2]
RFC 2797 Certificate Management Messages over CMS April 2000
No special services are provided for doing either renewal (new
certificates with the same key) or re-keying (new certificates on new
keys) of clients. Instead a renewal/re-key message looks the same as
any enrollment message, with the identity proof being supplied by
existing certificates from the CA.
A provision exists for Local Registration Authorities (LRAs) to
participate in the protocol by taking client enrollment messages,
wrapping them in a second layer of enrollment message with additional
requirements or statements from the LRA and then passing this new
expanded request on to the Certification Authority.
This specification makes no assumptions about the underlying
transport mechanism. The use of CMS is not meant to imply an email-
based transport.
Optional services available through this specification are
transaction management, replay detection (through nonces), deferred
certificate issuance, certificate revocation requests and
certificate/CRL retrieval.
2.1 Terminology
There are several different terms, abbreviations and acronyms used in
this document that we define here for convenience and consistency of
usage:
"End-Entity" (EE) refers to the entity that owns a key pair and for
whom a certificate is issued.
"LRA" or "RA" refers to a (Local) Registration Authority. A
registration authority acts as an intermediary between an End-
Entity and a Certification Authority. Multiple RAs can exist
between the End-Entity and the Certification Authority.
"CA" refers to a Certification Authority. A Certification Authority
is the entity that performs the actual issuance of a certificate.
"Client" refers to an entity that creates a PKI request. In this
document both RAs and End-Entities can be clients.
"Server" refers to the entities that process PKI requests and create
PKI responses. CAs and RAs can be servers in this document.
"PKCS#10" refers the Public Key Cryptography Standard #10. This is
one of a set of standards defined by RSA Laboratories in the
1980s. PKCS#10 defines a Certificate Request Message syntax.
"CRMF" refers to the Certificate Request Message Format RFC [CRMF].
We are using certificate request message format defined in this
document as part of our management protocol.
"CMS" refers to the Cryptographic Message Syntax RFC [CMS]. This
document provides for basic cryptographic services including
encryption and signing with and without key management.
Myers, et al. Standards Track [Page 3]
RFC 2797 Certificate Management Messages over CMS April 2000
"POP" is an acronym for "Proof of Possession". POP refers to a value
that can be used to prove that the private key corresponding to a
public key is in the possession and can be used by an end-entity.
"Transport wrapper" refers to the outermost CMS wrapping layer.
2.2 Protocol Flow Charts
Figure 1 shows the Simple Enrollment Request and Response messages.
The contents of these messages are detailed in Sections 4.1 and 4.3
below.
Simple PKI Request Simple PKI Response
------------------------- --------------------------
+----------+ +------------------+
| PKCS #10 | | CMS "certs-only" |
+----------+--------------+ | message |
| | +------------------+------+
| Certificate Request | | |
| | | CMS Signed Data, |
| Subject Name | | no signerInfo |
| Subject Public Key Info | | |
| (K_PUB) | | signedData contains one |
| Attributes | | or more certificates in |
| | | the "certificates" |
+-----------+-------------+ | portion of the |
| signed with | | signedData. |
| matching | | |
| K_PRIV | | encapsulatedContentInfo |
+-------------+ | is empty. |
| |
+--------------+----------+
| unsigned |
+----------+
Figure 1: Simple PKI Request and Response Messages
Myers, et al. Standards Track [Page 4]
RFC 2797 Certificate Management Messages over CMS April 2000
Full PKI Request Full PKI Response
----------------------- ------------------------
+----------------+ +----------------+
| CMS signedData | | CMS signedData |
| object | | object |
+----------------+--------+ +----------------+--------+
| | | |
| PKIData object | | ResponseBody object |
| | | |
| Sequence of: | | Sequence of: |
| <enrollment attribute>* | | <enrollment attribute>* |
| <certification request>*| | <CMS object>* |
| <CMS objects>* | | <other message>* |
| <other message>* | | |
| | | where * == zero or more |
| where * == zero or more | | |
| | | All certificates issued |
| Certificate requests | | as part of the response |
| are CRMF or PKCS#10 | | are included in the |
| objects. Attributes are | | "certificates" portion |
| (OID, ANY defined by | | of the signedData. |
| OID) pairs. | | Relevant CA certs and |
| | | CRLs can be included as |
+-------+-----------------+ | well. |
| signed (keypair | | |
| used may be pre-| +---------+---------------+
| existing or | | signed by the |
| identified in | | CA or an LRA |
| the request) | +---------------+
+-----------------+
Figure 2: Full PKI Request and Response Messages
Figure 2 shows the Full Enrollment Request and Response messages.
The contents of these messages are detailed in Sections 4.2 and 4.4
below.
3. Protocol Elements
This section covers each of the different elements that may be used
to construct enrollment request and enrollment response messages.
Section 4 will cover how to build the enrollment request and response
messages.
Myers, et al. Standards Track [Page 5]
RFC 2797 Certificate Management Messages over CMS April 2000
3.1 PKIData Object
The new content object PKIData has been defined for this protocol.
This new object is used as the body of the full PKI request message.
The new body is identified by:
id-cct-PKIData OBJECT IDENTIFIER ::= { id-cct 2 }
The ASN.1 structure corresponding to this new content type is:
PKIData ::= SEQUENCE {
controlSequence SEQUENCE SIZE(0..MAX) OF TaggedAttribute,
reqSequence SEQUENCE SIZE(0..MAX) OF TaggedRequest,
cmsSequence SEQUENCE SIZE(0..MAX) OF TaggedContentInfo,
otherMsgSequence SEQUENCE SIZE(0..MAX) OF OtherMsg
}
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