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
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
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
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
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in the Revised BSD License.
Table of Contents
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
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
<CODE BEGINS>
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) }
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
<CODE BEGINS>
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
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
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
[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
[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
Russ Housley
Vigil Security, LLC
516 Dranesville Road
Herndon, VA 20170
United States of America
Email: housley@vigilsec.com
Carl Wallace
Red Hound Software, Inc.
5112 27th St. N
Arlington, VA 22207
United States of America
Email: carl@redhoundsoftware.com
