ntp R. Salz Internet-Draft Akamai Technologies Updates: 5905, 5906, 8573, 7822, 7821 (if 17 August 2022 approved) Intended status: Standards Track Expires: 18 February 2023 Updating the NTP Registries draft-ietf-ntp-update-registries-06 Abstract The Network Time Protocol (NTP) and Network Time Security (NTS) documents define a number of assigned number registries, collectively called the NTP registries. Some registries have wrong values, some registries do not follow current common practice, and some are just right. For the sake of completeness, this document reviews all NTP and NTS registries. This document updates RFC 5905, RFC 5906, RFC 8573, RFC 7822, and RFC 7821. Notes This note is to be removed before publishing as an RFC. This document is a product of the NTP Working Group (https://dt.ietf.org/wg/ntp). Source for this draft and an issue tracker can be found at https://github.com/richsalz/draft-rsalz- update-registries. RFC Editor: Please update 'this RFC' to refer to this document, once its RFC number is known, through the document. 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- Drafts is at https://datatracker.ietf.org/drafts/current/. Salz Expires 18 February 2023 [Page 1] Internet-Draft Updating the NTP Registries August 2022 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." This Internet-Draft will expire on 18 February 2023. Copyright Notice Copyright (c) 2022 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 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Existing Registries . . . . . . . . . . . . . . . . . . . . . 3 2.1. Reference ID, Kiss-o'-Death . . . . . . . . . . . . . . . 3 2.2. Extension Field Types . . . . . . . . . . . . . . . . . . 3 2.3. Network Time Security Registries . . . . . . . . . . . . 4 3. Updated Registries . . . . . . . . . . . . . . . . . . . . . 4 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5 4.1. NTP Reference Identifier Codes . . . . . . . . . . . . . 5 4.2. NTP Kiss-o'-Death Codes . . . . . . . . . . . . . . . . . 5 4.3. NTP Extension Field Types . . . . . . . . . . . . . . . . 6 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9 6. Normative References . . . . . . . . . . . . . . . . . . . . 9 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 10 1. Introduction The Network Time Protocol (NTP) and Network Time Security (NTS) documents define a number of assigned number registries, collectively called the NTP registries. Some registries have wrong values, some registries do not follow current common practice, and some are just right. For the sake of completeness, this document reviews all NTP and NTS registries. The bulk of this document can be divided into two parts: Salz Expires 18 February 2023 [Page 2] Internet-Draft Updating the NTP Registries August 2022 * First, each registry, its defining document, and a summary of its syntax is defined. * Second, the revised format and entries for each registry that is being modified is specified. 2. Existing Registries This section describes the registries and the rules for them. It is intended to be a short summary of the syntax and registration requirements for each registry. The semantics and protocol processing rules for each registry -- that is, how an implementation acts when sending or receiving any of the fields -- are not described here. 2.1. Reference ID, Kiss-o'-Death [RFC5905] defined two registries; the Reference ID in Section 7.3, and the Kiss-o'-Death in Section 7.4. Both of these are allowed to be four ASCII characters; padded on the right with all-bits-zero if necessary. Entries that start with 0x58, the ASCII letter uppercase X, are reserved for Private or Experimental Use. Both registries are first-come first-served. The formal request to define the registries is in Section 16. [RFC5905], Section 7.5 defined the on-the-wire format of extension fields but did not create a registry for it. 2.2. Extension Field Types [RFC5906], Section 13 mentioned the Extension Field Types registry, and defined it indirectly by defining 30 extensions (10 each for request, response, and error response). It did not provide a formal definition of the columns in the registry. [RFC5906], Section 10 splits the Field Type into four subfields, only for use within the Autokey extensions. [RFC7821] added a new entry, Checksum Complement, to the Extension Field Types registry. [RFC7822] clarified the processing rules for Extension Field Types, particularly around the interaction with the Message Authentication Code (MAC) field. [RFC8573] changed the cryptography used in the MAC field. The following problems exists with the current registry: Salz Expires 18 February 2023 [Page 3] Internet-Draft Updating the NTP Registries August 2022 * Many of the entries in the Extension Field Types registry have swapped some of the nibbles; 0x1234 is listed as 0x1432 for example. This was due to documentation errors with the original implementation of Autokey. This document marks the erroneous values as reserved, in case there is an implementation that used the registered values instead of what the original implementation used. * Some values were mistakenly re-used. 2.3. Network Time Security Registries [RFC8915] defines the NTS protocol. Its registries are listed here for completeness, but no changes to them are specified in this document. Sections 7.1 through 7.5 (inclusive) added entries to existing registries. Section 7.6 created a new registry, NTS Key Establishment Record Types, that partitions the assigned numbers into three different registration policies: IETF Review, Specification Required, and Private or Experimental Use. Section 7.7 created a new registry, NTS Next Protocols, that similarly partitions the assigned numbers. Section 7.8 created two new registries, NTS Error Codes and NTS Warning Codes. Both registries are also partitioned the same way. 3. Updated Registries The following general guidelines apply to all registries updated here: * Every entry reserves a partition for Private or Experimentatal Use. * Registries with ASCII fields are now limited to uppercase letters; fields starting with 0x2D, the ASCII minus sign, are reserved for Private or Experimental Use. * The policy for every registry is now Specification Required, as defined in [RFC8126], Section 4.6. The IESG is requested to choose three designated experts, with two being required to approve a registry change. Salz Expires 18 February 2023 [Page 4] Internet-Draft Updating the NTP Registries August 2022 Each entry described in the sub-sections below is intended to completely replace the existing entry with the same name. 4. IANA Considerations 4.1. NTP Reference Identifier Codes The registration procedure is changed to Specification Required. The Note is changed to read as follows: * Codes beginning with the character "-" are reserved for experimentation and development. IANA cannot assign them. The columns are defined as follows: * ID (required): a four-byte value padded on the right with zeros. Each value must be an ASCII uppercase letter or minus sign * Clock source (required): A brief text description of the ID * Reference (required): the publication defining the ID. The existing entries are left unchanged. 4.2. NTP Kiss-o'-Death Codes The registration procedure is changed to Specification Required. The Note is changed to read as follows: * Codes beginning with the character "-" are reserved for experimentation and development. IANA cannot assign them. The columns are defined as follows: * ID (required): a four-byte value padded on the right with zeros. Each value must be an ASCII uppercase letter or minus sign. * Meaning source (required): A brief text description of the ID. * Reference (required): the publication defining the ID. The existing entries are left unchanged. Salz Expires 18 February 2023 [Page 5] Internet-Draft Updating the NTP Registries August 2022 4.3. NTP Extension Field Types The registration procedure is changed to Specification Required. The reference [RFC5906] should be added, if possible. The following two Notes should be added: * Field Types in the range 0xF000 through 0xFFFF, inclusive, are reserved for experimentation and development. IANA cannot assign them. Both NTS Cookie and Autokey Message Request have the same Field Type; in practice this is not a problem as the field semantics will be determined by other parts of the message. * The "Reserved for historic reasons" is for differences between the original documentation and implementation of Autokey and marks the erroneous values as reserved, in case there is an implementation that used the registered values instead of what the original implementation used. The columns are defined as follows: * Field Type (required): A two-byte value in hexadecimal. * Meaning (required): A brief text description of the field type. * Reference (required): the publication defining the field type. The table is replaced with the following entries. +============+===============================+=============+ | Field Type | Meaning | Reference | +============+===============================+=============+ | 0x0002 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x0102 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x0104 | Unique Identifier | RFC 8915, | | | | Section 5.3 | +------------+-------------------------------+-------------+ | 0x0200 | No-Operation Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0201 | Association Message Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0202 | Certificate Message Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0203 | Cookie Message Request | RFC 5906 | +------------+-------------------------------+-------------+ Salz Expires 18 February 2023 [Page 6] Internet-Draft Updating the NTP Registries August 2022 | 0x0204 | NTS Cookie | RFC 8915, | | | | Section 5.4 | +------------+-------------------------------+-------------+ | 0x0204 | Autokey Message Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0205 | Leapseconds Message Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0206 | Sign Message Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0207 | IFF Identity Message Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0208 | GQ Identity Message Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0209 | MV Identity Message Request | RFC 5906 | +------------+-------------------------------+-------------+ | 0x0302 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x0304 | NTS Cookie Placeholder | RFC 8915, | | | | Section 5.5 | +------------+-------------------------------+-------------+ | 0x0402 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x0404 | NTS Authenticator and | RFC 8915, | | | Encrypted Extension Fields | Section 5.6 | +------------+-------------------------------+-------------+ | 0x0502 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x0602 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x0702 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x2005 | UDP Checksum Complete | RFC 7821 | +------------+-------------------------------+-------------+ | 0x8002 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x8102 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x8200 | No-Operation Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8201 | Association Message Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8202 | Certificate Message Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8203 | Cookie Message Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8204 | Autokey Message Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8205 | Leapseconds Message Response | RFC 5906 | Salz Expires 18 February 2023 [Page 7] Internet-Draft Updating the NTP Registries August 2022 +------------+-------------------------------+-------------+ | 0x8206 | Sign Message Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8207 | IFF Identity Message Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8208 | GQ Identity Message Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8209 | MV Identity Message Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0x8302 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x8402 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x8502 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x8602 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x8702 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x8802 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC002 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC102 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC200 | No-Operation Error Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0xC201 | Association Message Error | RFC 5906 | | | Response | | +------------+-------------------------------+-------------+ | 0xC202 | Certificate Message Error | RFC 5906 | | | Response | | +------------+-------------------------------+-------------+ | 0xC203 | Cookie Message Error Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0xC204 | Autokey Message Error | RFC 5906 | | | Response | | +------------+-------------------------------+-------------+ | 0xC205 | Leapseconds Message Error | RFC 5906 | | | Response | | +------------+-------------------------------+-------------+ | 0xC206 | Sign Message Error Response | RFC 5906 | +------------+-------------------------------+-------------+ | 0xC207 | IFF Identity Message Error | RFC 5906 | | | Response | | +------------+-------------------------------+-------------+ | 0xC208 | GQ Identity Message Error | RFC 5906 | | | Response | | Salz Expires 18 February 2023 [Page 8] Internet-Draft Updating the NTP Registries August 2022 +------------+-------------------------------+-------------+ | 0xC209 | MV Identity Message Error | RFC 5906 | | | Response | | +------------+-------------------------------+-------------+ | 0xC302 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC402 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC502 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC602 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC702 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC802 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x0902 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0x8902 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ | 0xC902 | Reserved for historic reasons | This RFC | +------------+-------------------------------+-------------+ Table 1 5. Acknowledgements The members of the NTP Working Group helped a great deal. Notable contributors include: * Miroslav Lichvar, Red Hat * Daniel Franke, Akamai Technologies * Danny Mayer, Network Time Foundation * Michelle Cotton, formerly at IANA 6. Normative References [RFC5905] Mills, D., Martin, J., Ed., Burbank, J., and W. Kasch, "Network Time Protocol Version 4: Protocol and Algorithms Specification", RFC 5905, DOI 10.17487/RFC5905, June 2010, . Salz Expires 18 February 2023 [Page 9] Internet-Draft Updating the NTP Registries August 2022 [RFC5906] Haberman, B., Ed. and D. Mills, "Network Time Protocol Version 4: Autokey Specification", RFC 5906, DOI 10.17487/RFC5906, June 2010, . [RFC7821] Mizrahi, T., "UDP Checksum Complement in the Network Time Protocol (NTP)", RFC 7821, DOI 10.17487/RFC7821, March 2016, . [RFC7822] Mizrahi, T. and D. Mayer, "Network Time Protocol Version 4 (NTPv4) Extension Fields", RFC 7822, DOI 10.17487/RFC7822, March 2016, . [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 8126, DOI 10.17487/RFC8126, June 2017, . [RFC8573] Malhotra, A. and S. Goldberg, "Message Authentication Code for the Network Time Protocol", RFC 8573, DOI 10.17487/RFC8573, June 2019, . [RFC8915] Franke, D., Sibold, D., Teichel, K., Dansarie, M., and R. Sundblad, "Network Time Security for the Network Time Protocol", RFC 8915, DOI 10.17487/RFC8915, September 2020, . Author's Address Rich Salz Akamai Technologies Email: rsalz@akamai.com Salz Expires 18 February 2023 [Page 10]