DNS Extensions Working Group S. Rose Internet-Draft NIST Updates: 4034 (if approved) May 17, 2010 Intended status: Standards Track Expires: November 18, 2010 DNS Security (DNSSEC) DNSKEY IANA Registry Algorithm Status Addition draft-ietf-dnsext-dnssec-registry-fixes-04 Abstract The DNS Security Extensions (DNSSEC) has an IANA registry to allocate cryptographic algorithm suites for use in generating digital signatures over DNS data. Newly introduced cryptographic algorithms to DNSSEC mean implementors need to know which algorithms need to be implemented, which are optional, and which are obsolete. This document adds a column to the IANA registry table for Domain Name System Security (DNSSEC) Algorithm Numbers which lists their current status for use. Status of This Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on November 18, 2010. Copyright Notice Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved. Rose Expires November 18, 2010 [Page 1] Internet-Draft IANA Registry Fixes May 2010 This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://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 Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Requirements Language . . . . . . . . . . . . . . . . . . . 3 2. DNS Security Algorithm Number Subregistry Fixes . . . . . . . . 3 2.1. Individual Fixes . . . . . . . . . . . . . . . . . . . . . 4 2.2. Updated Registry Snapshot . . . . . . . . . . . . . . . . . 5 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 6 5. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.1. Normative References . . . . . . . . . . . . . . . . . . . 6 5.2. Informative References . . . . . . . . . . . . . . . . . . 7 Rose Expires November 18, 2010 [Page 2] Internet-Draft IANA Registry Fixes May 2010 1. Introduction The Domain Name System (DNS) Security Extensions (DNSSEC) [RFC4033], [RFC4034], and [RFC4035] uses digital signatures over DNS data to provide source authentication and integrity protection. DNSSEC uses an IANA registry to allocate codes for digital signature algorithms (consisting of a cryptographic algorithm and one-way hash function). Certain digital signature algorithms are considered MANDATORY to implement for interoperability while others listed in this registry are listed as OPTIONAL or OBSOLETE. The original list of algorithm status is found in [RFC4034]. Other DNSSEC documents have added new algorithms or changed the status of algorithms in the registry. However, implementors must read through all the documents in order to discover which algorithms are mandatory to implement and which are optional or no longer used. This document requests a column to be added to the IANA registry for Domain Name System Security (DNSSEC) Algorithm Numbers. This column will list the current status of each digital signature algorithm in the registry. The key words "MANDATORY", "DISCRETIONARY", "OBSOLETE", "DISCOURAGED", "ENCOURAGED" and "RESERVED" in this document are to be interpreted as described in [I-D.ogud-iana-protocol-maintenance-words] 1.1. Requirements Language 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 [RFC2119]. 2. DNS Security Algorithm Number Subregistry Fixes The DNS Security Algorithm Number subregistry (part of the Domain Name System (DNS) Security Number registry) will be modified to include a new column. This column will contain the current implementation requirements of the given algorithm. This document does not make any changes to any other column in the registry table. There are additional fixes to entries that are described in sub- section 2.1. The overall new registry table is in sub-section 2.2. The values for the status were obtained from [RFC4034] with updates for algorithms specified after the original DNSSEC specification. The status of algorithms marked OPTIONAL in [RFC4034] are changed to DISCRETIONARY as defined in [I-D.ogud-iana-protocol-maintenance-words]. The status of algorithms Rose Expires November 18, 2010 [Page 3] Internet-Draft IANA Registry Fixes May 2010 marked NOT RECOMMENDED in [RFC4034] are changed to OBSOLETE as defined in [I-D.ogud-iana-protocol-maintenance-words]. 2.1. Individual Fixes This document changes three entries in the Domain Name System Security (DNSSEC) Algorithm Registry. They are: The description for assignment number 4 is changed to "Reserved until 2020". The description for assignment number 9 is changed to "Reserved until 2020". The description for assignment number 11 is changed to "Reserved until 2020". Registry entries 13-251 remains Unassigned. The status of RSASHA1-NSEC3-SHA1 and DSA-NSEC3-SHA1 are both set to DISCRETIONARY. The status of RSA/SHA-256 and RSA/SHA-512 are set to ENCOURAGED as it is believed that these algorithms will replace older algorithms (e.g. RSA/SHA-1) that have a perceived weakness in their hash algorithm (SHA-1). Rose Expires November 18, 2010 [Page 4] Internet-Draft IANA Registry Fixes May 2010 2.2. Updated Registry Snapshot As of the current time, the DNS Security Algorithm Number subregistry would look like the following: Zone Trans Number Description Mnem. Sign Sign Status Reference ------ ----------- ------ ---- ----- ------------ --------- 0 Reserved [RFC4398] 1 RSA/MD5 RSAMD5 N Y OBSOLETE [RFC4034], [RFC3110] 2 Diffie-Hellman DH N Y DISCRETIONARY [RFC2539] 3 DSA/SHA-1 DSASHA1 Y Y DISCRETIONARY [RFC2536], [RFC4034], FIPS 186-3, FIPS 180-3 4 Reserved until ECC 2020 5 RSA/SHA-1 RSASHA1 Y Y MANDATORY [RFC4034] 6 DSA-NSEC3-SHA1 DSA-NSEC3 Y Y DISCRETIONARY [RFC5155] -SHA1 7 RSASHA1-NSEC3 RSASHA1- Y Y DISCRETIONARY [RFC5155] -SHA1 NSEC3- SHA1 8 RSA/SHA-256 RSASHA256 Y * ENCOURAGED [RFC5702] 9 Reserved until 2020 10 RSA/SHA-512 RSASHA512 Y * ENCOURAGED [RFC5702] 11 Reserved until 2020 12 GOST R GOST-ECC Y * DISCRETIONARY [RFCTBD] 34.10-2001 13-251 Unassigned 252 Reserved for INDIRECT N N DISCRETIONARY [RFC4034] Indirect keys 253 private PRIVATE Y Y DISCRETIONARY [RFC4034] algorithm 254 private PRIVATEOID Y Y DISCRETIONARY [RFC4034] algorithm OID 255 Reserved The requirement status for all new algorithms will be DISCRETIONARY unless a Standards Track document indicates otherwise (possibly including the Standards Track document defining the algorithm). Only a Standards Track document may make an algorithm ENCOURAGED or MANDATORY or remove the MANDATORY or ENCOURAGED designation (to DISCOURAGED or OBSOLETE for example). Rose Expires November 18, 2010 [Page 5] Internet-Draft IANA Registry Fixes May 2010 3. IANA Considerations This document consists entirely of DNS IANA Considerations and includes the following changes detailed in Section 2.1: The description of assignment 4 is changed from "Reserved for ECC" to "Reserved until 2020". The description of assignment 9 is changed from "Unassigned" to "Reserved until 2020". The description for assignment number 11 is changed from "Unassigned" to "Reserved until 2020". Registiry entries 13-251 remains Unassigned. The references for current algorithms in the table in Section 2.2 have been updated to remove obsolete RFC's and replaced with the current reference. The references to FIPS 180 and FIPS 186 have been updated (to FIPS 180-3 and FIPS 186-3 respectively) to reflect the latest versions. These revisions are maintenance updates and the relevant content of the FIPS documents have not changed. The new table is in Section 2.2. The Domain Name System (DNS) Security Algorithm Number registry is available at http:// www.iana.org/assignments/dns-sec-alg-numbers/ dns-sec-alg-numbers.xhtml. 4. Security Considerations This document seeks to add a status column to an existing IANA registry. It is not meant to be a discussion on algorithm superiority. No new security considerations are raised in this document. 5. References 5.1. Normative References [I-D.ogud-iana-protocol-maintenance-words] Gudmundsson, O. and S. Rose, "Definitions for expressing standards requirements in IANA registries.", draft-ogud- iana-protocol- maintenance-words-01 Rose Expires November 18, 2010 [Page 6] Internet-Draft IANA Registry Fixes May 2010 (work in progress), November 2009. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC4033] Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose, "DNS Security Introduction and Requirements", RFC 4033, March 2005. [RFC4034] Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose, "Resource Records for the DNS Security Extensions", RFC 4034, March 2005. [RFC4035] Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose, "Protocol Modifications for the DNS Security Extensions", RFC 4035, March 2005. 5.2. Informative References [FIPS.180-3.2008] National Institute of Standards and Technology, "Secure Hash Standard", FIPS PUB 180-3, October 2008, . [FIPS.186-3.2009] National Institute of Standards and Technology, "Digital Signature Standard", FIPS PUB 186-3, June 2009, . [RFC.TBD] Dolmatov, V., "Use of GOST signature algorithms in DNSKEY and RRSIG Resource Records for DNSSEC", draft-ietf- dnsext-dnssec-gost-07 (work in progress), March 2010. [RFC2536] Eastlake, D., "DSA KEYs and SIGs in the Domain Name System (DNS)", RFC 2536, March 1999. [RFC2539] Eastlake, D., "Storage of Diffie-Hellman Keys in the Domain Name System (DNS)", RFC 2539, March 1999. [RFC3110] Eastlake, D., "RSA/SHA-1 SIGs and RSA KEYs in the Domain Name System (DNS)", RFC 3110, May 2001. [RFC4398] Josefsson, S., "Storing Certificates in the Domain Name System (DNS)", RFC 4398, March 2006. [RFC5155] Laurie, B., Sisson, G., Arends, R., and D. Blacka, "DNS Security (DNSSEC) Hashed Authenticated Denial of Existence", RFC 5155, March 2008. [RFC5702] Jansen, J., "Use of SHA-2 Algorithms with RSA in DNSKEY and RRSIG Resource Records for DNSSEC", RFC 5702, October 2009. Rose Expires November 18, 2010 [Page 8] Internet-Draft IANA Registry Fixes May 2010 Author's Address Scott Rose NIST 100 Bureau Dr. Gaithersburg, MD 20899 USA Phone: +1-301-975-8439 EMail: scottr.nist@gmail.com Rose Expires November 18, 2010 [Page 9]