Internet DRAFT - draft-mandel-lamps-rfc5274bis
draft-mandel-lamps-rfc5274bis
LAMPS Working Group J. Mandel, Ed
Internet-Draft AKAYLA, Inc.
Obsoletes: 5274, 6402 (if approved) S. Turner, Ed
Intended status: Standards Track sn3rd
Expires: 5 September 2024 4 March 2024
Certificate Management Messages over CMS (CMC): Compliance Requirements
draft-mandel-lamps-rfc5274bis-02
Abstract
This document provides a set of compliance statements about the CMC
(Certificate Management over CMS) enrollment protocol. The ASN.1
structures and the transport mechanisms for the CMC enrollment
protocol are covered in other documents. This document provides the
information needed to make a compliant version of CMC.
This document obsoletes RFCs 5274 and 6402.
About This Document
This note is to be removed before publishing as an RFC.
Status information for this document may be found at
https://datatracker.ietf.org/doc/draft-mandel-lamps-rfc5274bis/.
Discussion of this document takes place on the WG LAMPS mailing list
(mailto:spasm@ietf.org), which is archived at
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https://www.ietf.org/mailman/listinfo/spasm/.
Source for this draft and an issue tracker can be found at
https://github.com/TBD.
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-
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This Internet-Draft will expire on 5 September 2024.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Requirements Terminology . . . . . . . . . . . . . . . . . . 4
4. Changes since RFC 5274 and 6402 . . . . . . . . . . . . . . . 5
5. Requirements for All Entities . . . . . . . . . . . . . . . . 5
5.1. Cryptographic Algorithm Requirements . . . . . . . . . . 6
5.2. Controls . . . . . . . . . . . . . . . . . . . . . . . . 7
5.3. CRMF Feature Requirements . . . . . . . . . . . . . . . . 9
6. Requirements for Clients . . . . . . . . . . . . . . . . . . 10
7. Requirements for Servers . . . . . . . . . . . . . . . . . . 10
8. Requirements for EEs . . . . . . . . . . . . . . . . . . . . 10
9. Requirements for RAs . . . . . . . . . . . . . . . . . . . . 10
10. Requirements for CAs . . . . . . . . . . . . . . . . . . . . 10
11. Security Considerations . . . . . . . . . . . . . . . . . . . 11
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
12.1. Normative References . . . . . . . . . . . . . . . . . . 11
12.2. Informative References . . . . . . . . . . . . . . . . . 13
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 14
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
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1. Introduction
The CMC (Certificate Management over CMS) protocol is designed in
terms of a client/server relationship. In the simplest case, the
client is the requestor of the certificate (i.e., the End Entity
(EE)) and the server is the issuer of the certificate (i.e., the
Certification Authority (CA)). The introduction of a Registration
Authority (RA) into the set of agents complicates the picture only
slightly. The RA becomes the server with respect to the certificate
requestor, and it becomes the client with respect to the certificate
issuer. Any number of RAs can be inserted into the picture in this
manner.
The RAs may serve specialized purposes that are not currently covered
by this document. One such purpose would be a Key Escrow agent. As
such, all certificate requests for encryption keys would be directed
through this RA and it would take appropriate action to do the key
archival. Key recovery requests could be defined in the CMC
methodology allowing for the Key Escrow agent to perform that
operation acting as the final server in the chain of agents.
If there are multiple RAs in the system, it is considered normal that
not all RAs will see all certificate requests. The routing between
the RAs may be dependent on the content of the certificate requests
involved.
This document is divided into six sections, each section specifying
the requirements that are specific to a class of agents in the CMC
model. These are 1) all Entities, 2) all Servers, 3) all Clients, 4)
all End-Entities, 5) all Registration Authorities, 6) all
Certification Authorities.
This document obsoletes [CMC-COMPv1] and [CMC-Updates].
2. 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.
Registration Authority (RA) or Local RA (LRA): Refers to an entity
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that acts as an intermediary between the EE and the CA. Multiple
RAs can exist between the End-Entity and the Certification
Authority. RAs may perform additional services such as key
generation or key archival. This document uses the term RA for
both RA and LRA.
Certification Authority (CA): Refers to the entity that issues
certificates.
Client: Refers to an entity that creates a PKI Request. In this
document, both RAs and EEs can be clients.
Server: Refers to the entities that process PKI Requests and create
PKI Responses. In this document both CAs and RAs can be servers.
PKCS #10: Refers to the Public Key Cryptography Standard #10
[PKCS10], which defines a certification request syntax.
CRMF: Refers to the Certificate Request Message Format RFC [CRMF].
CMC uses this certification request syntax defined in this
document as part of the 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.
PKI Request/Response: Refers to the requests/responses described in
this document. PKI Requests include certification requests,
revocation requests, etc. PKI Responses include certs-only
messages, failure messages, etc.
Proof-of-Identity: Refers to the client proving they are who they
say that they are to the server.
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.
3. Requirements Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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4. Changes since RFC 5274 and 6402
| Note: For now, this section will be list of the changes
| introduced by each version. After WGLC, this section will be
| finalized.
TODO for -03:
* Update cryptographic algorithm requirements
-02 version changes:
* Updated text in intro
* Changed "all agents" to "all entities" in overview
* Updated section header numbering
-01 version changes:
* Changed RFC 5272 references to draft-mandel-lamps-rfc5272bis
* Changed RFC 5273 references to draft-mandel-lamps-rfc5273bis
-00 version changes:
* Added "Changes Since 5274 and 6402" section
* Updated references
* Merged [CMC-Updates] text
* Updated and moved Acknowledgments
5. Requirements for All Entities
All [CMC-STRUCT] and [CMC-TRANS] compliance statements MUST be
adhered to unless specifically stated otherwise in this document.
All entities MUST support Full PKI Requests, Simple PKI Responses,
and Full PKI Responses. Servers SHOULD support Simple PKI Requests.
All entities MUST support the use of the CRMF syntax for
certification requests. Support for the PKCS #10 syntax for
certification requests SHOULD be implemented by servers.
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The extendedFailInfo field SHOULD NOT be populated in the
CMCStatusInfoV2 object; the failInfo field SHOULD be used to relay
this information. If the extendedFailInfo field is used, it is
suggested that an additional CMCStatusInfoV2 item exist for the same
body part with a failInfo field.
All entities MUST implement the HTTP transport mechanism as defined
in [CMC-TRANS]. Other transport mechanisms MAY be implemented.
5.1. Cryptographic Algorithm Requirements
All entities MUST verify DSA-SHA1 and RSA-SHA1 signatures in
SignedData (see [CMS-ALG]). Entities MAY verify other signature
algorithms. It is strongly suggested that RSA-PSS with SHA-1 be
verified (see [CMS-RSA-PSS]). It is strongly suggested that SHA-256
using RSA and RSA-PSS be verified (see [RSA-256]).
All entities MUST generate either DSA-SHA1 or RSA-SHA1 signatures for
SignedData (see [CMS-ALG]). Other signatures algorithms MAY be used
for generation.
All entities MUST support Advanced Encryption Standard (AES) as the
content encryption algorithm for EnvelopedData (see [CMS-AES]).
Other content encryption algorithms MAY be implemented.
All entities MUST support RSA as a key transport algorithm for
EnvelopedData (see [CMS-ALG]). All entities SHOULD support RSA-OAEP
(see [CMS-RSA-OAEP]) as a key transport algorithm. Other key
transport algorithms MAY be implemented.
If an entity supports key agreement for EnvelopedData, it MUST
support Diffie-Hellman (see [CMS-DH]).
If an entity supports PasswordRecipientInfo for EnvelopedData or
AuthenticatedData, it MUST support PBKDF2 [PBKDF2] for key derivation
algorithms. It MUST support AES key wrap (see [AES-WRAP] as the key
encryption algorithm.
If AuthenticatedData is supported, PasswordRecipientInfo MUST be
supported.
Algorithm requirements for the Identity Proof Version 2 control
Section 6.2.1 of [CMC-STRUCT] are: SHA-1 MUST be implemented for
hashAlgId. SHA-256 SHOULD be implemented for hashAlgId. HMAC-SHA1
MUST be implemented for macAlgId. HMAC-SHA256 SHOULD be implemented
for macAlgId.
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Algorithm requirements for the Pop Link Witness Version 2 control
Section 6.3.1 of [CMC-STRUCT] are: SHA-1 MUST be implemented for
keyGenAlgorithm. SHA-256 SHOULD be implemented for keyGenAlgorithm.
PBKDF2 [PBKDF2] MAY be implemented for keyGenAlgorithm. HMAC-SHA1
MUST be implemented for macAlgorithm. HMAC-SHA256 SHOULD be
implemented for macAlgorithm.
Algorithm requirements for the Encrypted POP and Decrypted POP
controls Section 6.7 of [CMC-STRUCT] are: SHA-1 MUST be implemented
for witnessAlgID. SHA-256 SHOULD be implemented for witnessAlgID.
HMAC-SHA1 MUST be implemented for thePOPAlgID. HMAC-SHA256 SHOULD be
implemented for thePOPAlgID.
Algorithm requirements for Publish Trust Anchors control Section 6.15
of [CMC-STRUCT] are: SHA-1 MUST be implemented for hashAlgorithm.
SHA-256 SHOULD be implemented for hashAlgorithm.
If an EE generates DH keys for certification, it MUST support
Section 4 of [DH-POP]. EEs MAY support Section 3 of [DH-POP]. CAs
and RAs that do POP verification MUST support Section 4 of [DH-POP]
and SHOULD support Section 3 of [DH-POP].
EEs that need to use a signature algorithm for keys that cannot
produce a signature MUST support Appendix C of [CMC-STRUCT] and MUST
support the Encrypted/Decrypted POP controls. CAs and RAs that do
POP verification MUST support this signature algorithm and MUST
support the Encrypted/Decrypted POP controls.
5.2. Controls
The following table lists the name and level of support required for
each control.
+============================+==========+==========+==========+
| Control | EE | RA | CA |
+============================+==========+==========+==========+
| Extended CMC Status Info | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| CMC Status Info | SHOULD | SHOULD | SHOULD |
+----------------------------+----------+----------+----------+
| Identity Proof Version 2 | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| Identity Proof | SHOULD | SHOULD | SHOULD |
+----------------------------+----------+----------+----------+
| Identification | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| POP Link Random | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
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| POP Link Witness Version 2 | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| POP Link Witness | SHOULD | MUST | MUST |
+----------------------------+----------+----------+----------+
| Data Return | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| Modify Cert Request | N/A | MUST | (2) |
+----------------------------+----------+----------+----------+
| Add Extensions | N/A | MAY | (1) |
+----------------------------+----------+----------+----------+
| Transaction ID | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| Sender Nonce | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| Recipient Nonce | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| Encrypted POP | (4) | (5) | SHOULD |
+----------------------------+----------+----------+----------+
| Decrypted POP | (4) | (5) | SHOULD |
+----------------------------+----------+----------+----------+
| RA POP Witness | N/A | SHOULD | (1) |
+----------------------------+----------+----------+----------+
| Get Certificate | optional | optional | optional |
+----------------------------+----------+----------+----------+
| Get CRL | optional | optional | optional |
+----------------------------+----------+----------+----------+
| Revocation Request | SHOULD | SHOULD | MUST |
+----------------------------+----------+----------+----------+
| Registration Info | SHOULD | SHOULD | SHOULD |
+----------------------------+----------+----------+----------+
| Response Information | SHOULD | SHOULD | SHOULD |
+----------------------------+----------+----------+----------+
| Query Pending | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| Confirm Cert. Acceptance | MUST | MUST | MUST |
+----------------------------+----------+----------+----------+
| Publish Trust Anchors | (3) | (3) | (3) |
+----------------------------+----------+----------+----------+
| Authenticate Data | (3) | (3) | (3) |
+----------------------------+----------+----------+----------+
| Batch Request | N/A | MUST | (2) |
+----------------------------+----------+----------+----------+
| Batch Responses | N/A | MUST | (2) |
+----------------------------+----------+----------+----------+
| Publication Information | optional | optional | optional |
+----------------------------+----------+----------+----------+
| Control Processed | N/A | MUST | (2) |
+----------------------------+----------+----------+----------+
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| RA Identity Proof Witness | N/A | MUST | (2) |
+----------------------------+----------+----------+----------+
| Response Body | (6) | (6) | N/A. |
+----------------------------+----------+----------+----------+
Table 1: CMC Control Attributes
Notes:
1. CAs SHOULD implement this control if designed to work with RAs.
2. CAs MUST implement this control if designed to work with RAs.
3. Implementation is optional for these controls. We strongly
suggest that they be implemented in order to populate client
trust anchors.
4. EEs only need to implement this if (a) they support key agreement
algorithms or (b) they need to operate in environments where the
hardware keys cannot provide POP.
5. RAs SHOULD implement this if they implement RA POP Witness.
6. EE's SHOULD implement if designed to work with RAs and MUST
implement if intended to be used in environments where RAs are
used for identity validation or key generation. RAs SHOULD
implement and validate responses for consistency.
Strong consideration should be given to implementing the Authenticate
Data and Publish Trust Anchors controls as this gives a simple method
for distributing trust anchors into clients without user
intervention.
5.3. CRMF Feature Requirements
The following additional restrictions are placed on CRMF features:
The registration control tokens id-regCtrl-regToken and id-regCtrl-
authToken MUST NOT be used. No specific CMC feature is used to
replace these items, but generally the CMC controls identification
and identityProof will perform the same service and are more
specifically defined.
The control token id-regCtrl-pkiArchiveOptions SHOULD NOT be
supported. An alternative method is under development to provide
this functionality.
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The behavior of id-regCtrl-oldCertID is not presently used. It is
replaced by issuing the new certificate and using the id-cmc-
publishCert to remove the old certificate from publication. This
operation would not normally be accompanied by an immediate
revocation of the old certificate; however, that can be accomplished
by the id-cmc-revokeRequest control.
The id-regCtrl-protocolEncrKey is not used.
6. Requirements for Clients
There are no additional requirements.
7. Requirements for Servers
There are no additional requirements.
8. Requirements for EEs
If an entity implements Diffie-Hellman, it MUST implement either the
DH-POP Proof-of-Possession as defined in Section 4 of [DH-POP] or the
challenge-response POP controls id-cmc-encryptedPOP and id-cmc-
decryptedPOP.
9. Requirements for RAs
RAs SHOULD be able to do delegated POP. RAs implementing this
feature MUST implement the id-cmc-lraPOPWitness control.
All RAs MUST implement the promotion of the id-aa-cmc-unsignedData as
covered in Section 3.2.3 of [CMC-STRUCT].
10. Requirements for CAs
Providing for CAs to work in an environment with RAs is strongly
suggested. Implementation of such support is strongly suggested as
this permits the delegation of substantial administrative interaction
onto an RA rather than at the CA.
CAs MUST perform at least minimal checks on all public keys before
issuing a certificate. At a minimum, a check for syntax would occur
with the POP operation. Additionally, CAs SHOULD perform simple
checks for known bad keys such as small subgroups for DSA-SHA1 and DH
keys [SMALL-SUB-GROUP] or known bad exponents for RSA keys.
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CAs MUST enforce POP checking before issuing any certificate. CAs
MAY delegate the POP operation to an RA for those cases where 1) a
challenge/response message pair must be used, 2) an RA performs
escrow of a key and checks for POP in that manner, or 3) an unusual
algorithm is used and that validation is done at the RA.
CAs SHOULD implement both the DH-POP Proof-of-Possession as defined
in Section 4 of [DH-POP] and the challenge-response POP controls id-
cmc-encryptedPOP and id-cmc-decryptedPOP.
11. Security Considerations
This document uses [CMC-STRUCT] and [CMC-TRANS] as building blocks to
this document. The security sections of those two documents are
included by reference.
Knowledge of how an entity is expected to operate is vital in
determining which sections of requirements are applicable to that
entity. Care needs to be taken in determining which sections apply
and fully implementing the necessary code.
Cryptographic algorithms have and will be broken or weakened.
Implementers and users need to check that the cryptographic
algorithms listed in this document make sense from a security level.
The IETF from time to time may issue documents dealing with the
current state of the art. Two examples of such documents are
[SMALL-SUB-GROUP] and [HASH-ATTACKS].
12. References
12.1. Normative References
[AES-WRAP] Schaad, J. and R. Housley, "Advanced Encryption Standard
(AES) Key Wrap Algorithm", RFC 3394, DOI 10.17487/RFC3394,
September 2002, <https://www.rfc-editor.org/rfc/rfc3394>.
[CMC-STRUCT]
Mandel, J. and S. Turner, "Certificate Management over CMS
(CMC)", Work in Progress, Internet-Draft, draft-mandel-
lamps-rfc5272bis-01, 8 January 2024,
<https://datatracker.ietf.org/doc/html/draft-mandel-lamps-
rfc5272bis-01>.
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[CMC-TRANS]
Mandel, J. and S. Turner, "Certificate Management over CMS
(CMC): Transport Protocols", Work in Progress, Internet-
Draft, draft-mandel-lamps-rfc5273bis-01, 8 January 2024,
<https://datatracker.ietf.org/doc/html/draft-mandel-lamps-
rfc5273bis-01>.
[CMS] Housley, R., "Cryptographic Message Syntax (CMS)", STD 70,
RFC 5652, DOI 10.17487/RFC5652, September 2009,
<https://www.rfc-editor.org/rfc/rfc5652>.
[CMS-AES] Schaad, J., "Use of the Advanced Encryption Standard (AES)
Encryption Algorithm in Cryptographic Message Syntax
(CMS)", RFC 3565, DOI 10.17487/RFC3565, July 2003,
<https://www.rfc-editor.org/rfc/rfc3565>.
[CMS-ALG] Housley, R., "Cryptographic Message Syntax (CMS)
Algorithms", RFC 3370, DOI 10.17487/RFC3370, August 2002,
<https://www.rfc-editor.org/rfc/rfc3370>.
[CMS-DH] Rescorla, E., "Diffie-Hellman Key Agreement Method",
RFC 2631, DOI 10.17487/RFC2631, June 1999,
<https://www.rfc-editor.org/rfc/rfc2631>.
[CMS-RSA-OAEP]
Housley, R., "Use of the RSAES-OAEP Key Transport
Algorithm in Cryptographic Message Syntax (CMS)",
RFC 3560, DOI 10.17487/RFC3560, July 2003,
<https://www.rfc-editor.org/rfc/rfc3560>.
[CMS-RSA-PSS]
Schaad, J., "Use of the RSASSA-PSS Signature Algorithm in
Cryptographic Message Syntax (CMS)", RFC 4056,
DOI 10.17487/RFC4056, June 2005,
<https://www.rfc-editor.org/rfc/rfc4056>.
[CRMF] Schaad, J., "Internet X.509 Public Key Infrastructure
Certificate Request Message Format (CRMF)", RFC 4211,
DOI 10.17487/RFC4211, September 2005,
<https://www.rfc-editor.org/rfc/rfc4211>.
[DH-POP] Schaad, J. and H. Prafullchandra, "Diffie-Hellman Proof-
of-Possession Algorithms", RFC 6955, DOI 10.17487/RFC6955,
May 2013, <https://www.rfc-editor.org/rfc/rfc6955>.
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[PBKDF2] Kaliski, B., "PKCS #5: Password-Based Cryptography
Specification Version 2.0", RFC 2898,
DOI 10.17487/RFC2898, September 2000,
<https://www.rfc-editor.org/rfc/rfc2898>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.
[RSA-256] Schaad, J., Kaliski, B., and R. Housley, "Additional
Algorithms and Identifiers for RSA Cryptography for use in
the Internet X.509 Public Key Infrastructure Certificate
and Certificate Revocation List (CRL) Profile", RFC 4055,
DOI 10.17487/RFC4055, June 2005,
<https://www.rfc-editor.org/rfc/rfc4055>.
12.2. Informative References
[CMC-COMPv1]
Mandel, J. and S. Turner, "Certificate Management Messages
over CMS (CMC): Compliance Requirements", Work in
Progress, Internet-Draft, draft-mandel-lamps-rfc5274bis-
01, 8 January 2024,
<https://datatracker.ietf.org/doc/html/draft-mandel-lamps-
rfc5274bis-01>.
[CMC-Updates]
Schaad, J., "Certificate Management over CMS (CMC)
Updates", RFC 6402, DOI 10.17487/RFC6402, November 2011,
<https://www.rfc-editor.org/rfc/rfc6402>.
[HASH-ATTACKS]
Hoffman, P. and B. Schneier, "Attacks on Cryptographic
Hashes in Internet Protocols", RFC 4270,
DOI 10.17487/RFC4270, November 2005,
<https://www.rfc-editor.org/rfc/rfc4270>.
[PKCS10] Nystrom, M. and B. Kaliski, "PKCS #10: Certification
Request Syntax Specification Version 1.7", RFC 2986,
DOI 10.17487/RFC2986, November 2000,
<https://www.rfc-editor.org/rfc/rfc2986>.
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[SMALL-SUB-GROUP]
Zuccherato, R., "Methods for Avoiding the "Small-Subgroup"
Attacks on the Diffie-Hellman Key Agreement Method for S/
MIME", RFC 2785, DOI 10.17487/RFC2785, March 2000,
<https://www.rfc-editor.org/rfc/rfc2785>.
Acknowledgements
Obviously, the authors of this version of the document would like to
thank Jim Schaad and Michael Myers for their work on the previous
version of this document.
The acknowledgment from the previous version of this document
follows:
The authors and the PKIX Working Group are grateful for the
participation of Xiaoyi Liu and Jeff Weinstein in helping to author
the original versions of this document.
The authors would like to thank Brian LaMacchia for his work in
developing and writing up many of the concepts presented in this
document. The authors would also like to thank Alex Deacon and Barb
Fox for their contributions.
Contributors
Jim Schaad
August Cellars
Michael Myers
TraceRoute Security, Inc.
Authors' Addresses
Joseph Mandel
AKAYLA, Inc.
Email: joe@akyala.com
Sean Turner
sn3rd
Email: sean@sn3rd.com
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