Re: [pkix] [Technical Errata Reported] RFC3029 (6444)
Russ Housley <housley@vigilsec.com> Sun, 28 February 2021 22:26 UTC
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From: Russ Housley <housley@vigilsec.com>
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Date: Sun, 28 Feb 2021 17:26:00 -0500
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Cc: "Roman D. Danyliw" <rdd@cert.org>, Ben Kaduk <kaduk@mit.edu>, Stefan Santesson <stefan@aaa-sec.com>, IETF PKIX <pkix@ietf.org>, Carlisle Adams <cadams@site.uottawa.ca>
To: Erwann Abalea <eabalea@gmail.com>
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Subject: Re: [pkix] [Technical Errata Reported] RFC3029 (6444)
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Erwann: > > Le sam. 27 févr. 2021 à 08:45, Russ Housley <housley@vigilsec.com <mailto:housley@vigilsec.com>> a écrit : > I guess I should have held off on reporting this ASN.1 error. Once I corrected it, I discovered two errors that I do not know how to fix. > > There is an implementation somewhere because Appendix F contains examples. I do not know how the implementer got around these two problems. > > > PROBLEM 1: > > CertEtcToken ::= CHOICE { > certificate [0] IMPLICIT Certificate , > esscertid [1] ESSCertId , > pkistatus [2] IMPLICIT PKIStatusInfo , > assertion [3] ContentInfo , > crl [4] IMPLICIT CertificateList, > ocspcertstatus [5] IMPLICIT CertStatus, > oscpcertid [6] IMPLICIT CertId , > oscpresponse [7] IMPLICIT OCSPResponse, > capabilities [8] SMIMECapabilities, > extension Extension{{ExtensionSet}} > } > > CertEtcToken is a CHOICE with tags 0 through 8, but CertStatus CHOICE with tags 0 through 2. You cannot nest a CHOICE in another CHOICE is the IMPLICIT tags overlap. > > The use of EXPLICIT tagging would have solved the problem, but the authors clearly preferred IMPLICIT tags. > > Here, it's easy. The outermost IMPLICIT tag is transformed into an EXPLICIT one by the ASN.1 compiler (it will probably emit a warning, though). Yes, I am aware of that possibility of fixing the specification, but it is unclear what an implementer would do with a ASN.1 module with compilation errors, or a warning that inserts a EXPLICIT. > > PROBLEM 2 > > DigestInfo ::= SEQUENCE { > digestAlgorithm DigestAlgorithmIdentifier, > digest Digest > } > > Data ::= CHOICE { > message OCTET STRING , > messageImprint DigestInfo, > certs SEQUENCE SIZE (1..MAX) OF > TargetEtcChain > } > > DigestInfo is a SEQUENCE, and certs is a SEQUENCE, so the two have the same tag. A recipient cannot tell which one the sender intended. > > For this one, there's clearly no solution. Tagging would have solved it (any kind of tagging mode), but it's missing. Indeed, at lease one of the SEQUENCE needs a tag. Russ
- [pkix] [Technical Errata Reported] RFC3029 (6444) RFC Errata System
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Russ Housley
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Erwann Abalea
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Stefan Santesson
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Russ Housley
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Carlisle Adams
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Russ Housley
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Stefan Santesson
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Russ Housley
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Stefan Santesson
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Carl Wallace
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Carl Wallace
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Peter Gutmann
- Re: [pkix] [Technical Errata Reported] RFC3029 (6… Russ Housley