Internet Engineering Task Force (IETF) R. Housley
Request for Comments: 9169 Vigil Security
Category: Informational C. Wallace
ISSN: 2070-1721 Red Hound Software
December 2021
New ASN.1 Modules for the Evidence Record Syntax (ERS)
Abstract
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The Evidence Record Syntax (ERS) and the conventions for including these evidence records in the Server-based Certificate Validation Protocol (SCVP) are expressed using ASN.1. This document offers alternative ASN.1 modules that conform to the 2002 version of ASN.1 and employ the conventions adopted in RFCs 5911, 5912, and 6268. There are no bits-on-the-wire changes to any of the formats; this is simply a change to the ASN.1 syntax.
Status of This Memo
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This document is not an Internet Standards Track specification; it is published for informational purposes.
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). Not all documents approved by the IESG are candidates for any level of Internet Standard; see 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/rfc9169.
Copyright Notice
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Copyright © 2021 IETF Trust and the persons identified as the document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.
Table of Contents
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1. Introduction 2. ASN.1 Module for RFC 4998 3. ASN.1 Module for RFC 5276 4. IANA Considerations 5. Security Considerations 6. References 6.1. Normative References 6.2. Informative References Authors' Addresses
1. Introduction
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Some developers would like the IETF to use the latest version of ASN.1 in its standards. This document provides alternative ASN.1 modules to assist in that goal.
The Evidence Record Syntax (ERS) [RFC4998] provides two ASN.1 modules: one using the 1988 syntax [OLD-ASN1], which has been deprecated by the ITU-T, and another one using the newer syntax [NEW-ASN1], which continues to be maintained and enhanced. This document provides an alternative ASN.1 module that follows the conventions established in [RFC5911], [RFC5912], and [RFC6268].
In addition, [RFC5276] specifies the mechanism for conveying evidence records in the Server-based Certificate Validation Protocol (SCVP) [RFC5055]. There is only one ASN.1 module in [RFC5276], and it uses the 1988 syntax [OLD-ASN1]. This document provides an alternative ASN.1 module using the newer syntax [NEW-ASN1] and follows the conventions established in [RFC5911], [RFC5912], and [RFC6268]. Note that [RFC5912] already includes an alternative ASN.1 module for SCVP [RFC5055].
The original ASN.1 modules get some of their definitions from places outside the RFC series. Some of the referenced definitions are somewhat difficult to find. The alternative ASN.1 modules offered in this document stand on their own when combined with the modules in [RFC5911], [RFC5912], and [RFC6268].
The alternative ASN.1 modules produce the same bits on the wire as the original ones.
The alternative ASN.1 modules are informative; the original ones are normative.
2. ASN.1 Module for RFC 4998
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<CODE BEGINS>
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ERS-2021
{ iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) ltans(11) id-mod(0) id-mod-ers(1) id-mod-ers-v2(2) } DEFINITIONS IMPLICIT TAGS ::= BEGIN EXPORTS ALL; IMPORTS-
ContentInfo
FROM CryptographicMessageSyntax-2010 -- in [RFC6268]
{ iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1)
pkcs-9(9) smime(16) modules(0) id-mod-cms-2009(58) }
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AlgorithmIdentifier{}, DIGEST-ALGORITHM FROM AlgorithmInformation-2009 -- in [RFC5912] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-algorithmInformation-02(58) } AttributeSet{}, ATTRIBUTE FROM PKIX-CommonTypes-2009 -- in [RFC5912] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-pkixCommon-02(57) } ; ltans OBJECT IDENTIFIER ::= { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) ltans(11) }-
EvidenceRecord ::= SEQUENCE {
version INTEGER { v1(1) }, digestAlgorithms SEQUENCE OF AlgorithmIdentifier {DIGEST-ALGORITHM, {...}}, cryptoInfos [0] CryptoInfos OPTIONAL, encryptionInfo [1] EncryptionInfo OPTIONAL, archiveTimeStampSequence ArchiveTimeStampSequence } CryptoInfos ::= SEQUENCE SIZE (1..MAX) OF Attribute-
ArchiveTimeStamp ::= SEQUENCE {
digestAlgorithm [0] AlgorithmIdentifier {DIGEST-ALGORITHM, {...}} OPTIONAL, attributes [1] Attributes OPTIONAL, reducedHashtree [2] SEQUENCE OF PartialHashtree OPTIONAL, timeStamp ContentInfo }-
PartialHashtree ::= SEQUENCE OF OCTET STRING
Attributes ::= SET SIZE (1..MAX) OF Attribute ArchiveTimeStampChain ::= SEQUENCE OF ArchiveTimeStamp ArchiveTimeStampSequence ::= SEQUENCE OF ArchiveTimeStampChain-
EncryptionInfo ::= SEQUENCE {
encryptionInfoType ENCINFO-TYPE.&id ({SupportedEncryptionAlgorithms}), encryptionInfoValue ENCINFO-TYPE.&Type ({SupportedEncryptionAlgorithms}{@encryptionInfoType}) } ENCINFO-TYPE ::= TYPE-IDENTIFIER SupportedEncryptionAlgorithms ENCINFO-TYPE ::= { ... } aa-er-internal ATTRIBUTE ::= { TYPE EvidenceRecord IDENTIFIED BY id-aa-er-internal } id-aa-er-internal OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9) smime(16) id-aa(2) 49 } aa-er-external ATTRIBUTE ::= { TYPE EvidenceRecord IDENTIFIED BY id-aa-er-external } id-aa-er-external OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9) smime(16) id-aa(2) 50 } ERSAttrSet ATTRIBUTE ::= { aa-er-internal | aa-er-external, ... } Attribute ::= AttributeSet {{ERSAttrSet}} END <CODE ENDS> -
3. ASN.1 Module for RFC 5276
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<CODE BEGINS>
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LTANS-SCVP-EXTENSION-2021
{ iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) ltans(11) id-mod(0) id-mod-ers-scvp(5) id-mod-ers-scvp-v2(2) } DEFINITIONS IMPLICIT TAGS ::= BEGIN EXPORTS ALL; IMPORTS id-swb, CertBundle, WANT-BACK, AllWantBacks FROM SCVP-2009 -- in [RFC5912] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-scvp-02(52) } EvidenceRecord FROM ERS-2021 -- in [RFC9169] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) ltans(11) id-mod(0) id-mod-ers(1) id-mod-ers-v2(2) } ;-
EvidenceRecordWantBack ::= SEQUENCE {
targetWantBack WANT-BACK.&id ({ExpandedWantBacks}), evidenceRecord EvidenceRecord OPTIONAL } EvidenceRecordWantBacks ::= SEQUENCE SIZE (1..MAX) OF EvidenceRecordWantBack EvidenceRecords ::= SEQUENCE SIZE (1..MAX) OF EvidenceRecord ExpandedWantBacks WANT-BACK ::= { AllWantBacks | NewWantBacks | ERSWantBacks, ... } NewWantBacks WANT-BACK ::= { swb-partial-cert-path, ... } swb-partial-cert-path WANT-BACK ::= { CertBundle IDENTIFIED BY id-swb-partial-cert-path } id-swb-partial-cert-path OBJECT IDENTIFIER ::= { id-swb 15 } ERSWantBacks WANT-BACK ::= { swb-ers-pkc-cert | swb-ers-best-cert-path | swb-ers-partial-cert-path | swb-ers-revocation-info | swb-ers-all, ... } swb-ers-pkc-cert WANT-BACK ::= { EvidenceRecord IDENTIFIED BY id-swb-ers-pkc-cert } id-swb-ers-pkc-cert OBJECT IDENTIFIER ::= { id-swb 16 } swb-ers-best-cert-path WANT-BACK ::= { EvidenceRecord IDENTIFIED BY id-swb-ers-best-cert-path } id-swb-ers-best-cert-path OBJECT IDENTIFIER ::= { id-swb 17 } swb-ers-partial-cert-path WANT-BACK ::= { EvidenceRecord IDENTIFIED BY id-swb-ers-partial-cert-path } id-swb-ers-partial-cert-path OBJECT IDENTIFIER ::= { id-swb 18 } swb-ers-revocation-info WANT-BACK ::= { EvidenceRecords IDENTIFIED BY id-swb-ers-revocation-info } id-swb-ers-revocation-info OBJECT IDENTIFIER ::= { id-swb 19 } swb-ers-all WANT-BACK ::= { EvidenceRecordWantBacks IDENTIFIED BY id-swb-ers-all } id-swb-ers-all OBJECT IDENTIFIER ::= { id-swb 20 } END <CODE ENDS>
4. IANA Considerations
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IANA has assigned two object identifiers from the "SMI Security for LTANS Module Identifier" registry to identify the two ASN.1 modules in this document.
The following object identifiers have been assigned:
+======================+====================+===========+ | OID Value | Description | Reference | +======================+====================+===========+ | 1.3.6.1.5.5.11.0.1.2 | id-mod-ers-v2 | RFC 9169 | +----------------------+--------------------+-----------+ | 1.3.6.1.5.5.11.0.5.2 | id-mod-ers-scvp-v2 | RFC 9169 | +----------------------+--------------------+-----------+
Table 1: IANA Object Identifiers
5. Security Considerations
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Please see the security considerations in [RFC4998] and [RFC5276]. This document makes no changes to the security considerations in those documents. The ASN.1 modules in this document preserve bits on the wire as the ASN.1 modules that they replace.
6. References
6.1. Normative References
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[NEW-ASN1] ITU-T, "Information technology -- Abstract Syntax Notation One (ASN.1): Specification of basic notation", ITU-T Recommendation X.680, ISO/IEC 8824-1:2021, February 2021, <https://www.itu.int/rec/T-REC-X.680>. [RFC4998] Gondrom, T., Brandner, R., and U. Pordesch, "Evidence Record Syntax (ERS)", RFC 4998, DOI 10.17487/RFC4998, August 2007, <https://www.rfc-editor.org/info/rfc4998>. [RFC5055] Freeman, T., Housley, R., Malpani, A., Cooper, D., and W. Polk, "Server-Based Certificate Validation Protocol (SCVP)", RFC 5055, DOI 10.17487/RFC5055, December 2007, <https://www.rfc-editor.org/info/rfc5055>. [RFC5276] Wallace, C., "Using the Server-Based Certificate Validation Protocol (SCVP) to Convey Long-Term Evidence Records", RFC 5276, DOI 10.17487/RFC5276, August 2008, <https://www.rfc-editor.org/info/rfc5276>. [RFC5911] Hoffman, P. and J. Schaad, "New ASN.1 Modules for Cryptographic Message Syntax (CMS) and S/MIME", RFC 5911, DOI 10.17487/RFC5911, June 2010, <https://www.rfc-editor.org/info/rfc5911>. [RFC5912] Hoffman, P. and J. Schaad, "New ASN.1 Modules for the Public Key Infrastructure Using X.509 (PKIX)", RFC 5912, DOI 10.17487/RFC5912, June 2010, <https://www.rfc-editor.org/info/rfc5912>. [RFC6268] Schaad, J. and S. Turner, "Additional New ASN.1 Modules for the Cryptographic Message Syntax (CMS) and the Public Key Infrastructure Using X.509 (PKIX)", RFC 6268, DOI 10.17487/RFC6268, July 2011, <https://www.rfc-editor.org/info/rfc6268>.
6.2. Informative References
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[OLD-ASN1] CCITT, "Specification of Abstract Syntax Notation One (ASN.1)", CCITT Recommendation X.208, November 1988, <https://www.itu.int/rec/T-REC-X.208/en>.
Authors' Addresses
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Russ Housley
Vigil Security, LLC
516 Dranesville Road
Herndon, VA 20170
United States of AmericaEmail:
housley@vigilsec.com
Carl Wallace
Red Hound Software, Inc.
5112 27th St. N
Arlington, VA 22207
United States of AmericaEmail:
carl@redhoundsoftware.com