Internet DRAFT - draft-ietf-ntp-update-registries
draft-ietf-ntp-update-registries
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/.
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Internet-Drafts are draft documents valid for a maximum of six months
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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/
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Please review these documents carefully, as they describe your rights
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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:
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* 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:
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* 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.
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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.
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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 |
+------------+-------------------------------+-------------+
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| 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 |
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+------------+-------------------------------+-------------+
| 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 | |
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+------------+-------------------------------+-------------+
| 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,
<https://www.rfc-editor.org/rfc/rfc5905>.
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[RFC5906] Haberman, B., Ed. and D. Mills, "Network Time Protocol
Version 4: Autokey Specification", RFC 5906,
DOI 10.17487/RFC5906, June 2010,
<https://www.rfc-editor.org/rfc/rfc5906>.
[RFC7821] Mizrahi, T., "UDP Checksum Complement in the Network Time
Protocol (NTP)", RFC 7821, DOI 10.17487/RFC7821, March
2016, <https://www.rfc-editor.org/rfc/rfc7821>.
[RFC7822] Mizrahi, T. and D. Mayer, "Network Time Protocol Version 4
(NTPv4) Extension Fields", RFC 7822, DOI 10.17487/RFC7822,
March 2016, <https://www.rfc-editor.org/rfc/rfc7822>.
[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,
<https://www.rfc-editor.org/rfc/rfc8126>.
[RFC8573] Malhotra, A. and S. Goldberg, "Message Authentication Code
for the Network Time Protocol", RFC 8573,
DOI 10.17487/RFC8573, June 2019,
<https://www.rfc-editor.org/rfc/rfc8573>.
[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,
<https://www.rfc-editor.org/rfc/rfc8915>.
Author's Address
Rich Salz
Akamai Technologies
Email: rsalz@akamai.com
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