Internet-Draft | (D)TLS IANA Registry Updates | February 2023 |
Salowey & Turner | Expires 6 August 2023 | [Page] |
This document updates the changes to TLS and DTLS IANA registries made in RFC 8447. It adds a new value "D" for discouraged to the recommended column of the selected TLS registries.¶
This document updates the following RFCs: 3749, 5077, 4680, 5246, 5705, 5878, 6520, 7301, and 8447.¶
This note is to be removed before publishing as an RFC.¶
Status information for this document may be found at https://datatracker.ietf.org/doc/draft-ietf-tls-rfc8447bis/.¶
Discussion of this document takes place on the Transport Layer Security Working Group mailing list (mailto:tls@ietf.org), which is archived at https://mailarchive.ietf.org/arch/browse/tls/. Subscribe at https://www.ietf.org/mailman/listinfo/tls/.¶
Source for this draft and an issue tracker can be found at https://github.com/tlswg/rfc8447bis.¶
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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This Internet-Draft will expire on 6 August 2023.¶
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This document instructs IANA to make changes to a number of the IANA registries related to Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS). These changes update the changes made in [RFC8447].¶
This specification updates the "Recommended" column in TLS registries to define a third value "D" for items that are discouraged.¶
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶
The instructions in this document update the Recommended column, originally added in [RFC8447] to add a third value, "D", indicating that a value is "Discouraged". The permitted values are:¶
Setting a value to "Y" or "D" in the "Recommended" column requires IETF Standards Action [RFC8126]. Any state transition to or from a "Y" or "D" value requires IESG Apporval. Not all items defined in Standards Track RFCs need to be set to "Y" or "D". Any item not otherwise specified is set to "N". The column is blank for values that are unassigned or reserved unless specifically set.¶
Existing registries have a note on the meaning of the recommended column. For the registries discussed in the subsequent sections this note is updated with a sentence describing the 'D' vaue as follows:¶
If "Recommended" column is set to "N", it does not necessarily mean that it is flawed; rather, it indicates that the item either has not been through the IETF consensus process, has limited applicability, or is intended only for specific use cases. If the "Recommended" column is set to "D" the item is discouraged and SHOULD NOT or MUST NOT be used.¶
In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS ExtensionType Values registry as follows:¶
Values with the first byte in the range 0-254 (decimal) are assigned via Specification Required [RFC8126]. Values with the first byte 255 (decimal) are reserved for Private Use [RFC8126]. Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
Value | Extension | Recommended |
---|---|---|
4 | truncated_hmac | D |
53 | connection_id (deprecated) | D |
40 | Reserved | D |
46 | Reserved | D |
In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS ExtensionType Values registry as follows:¶
Values with the first byte in the range 0-254 (decimal) are assigned via Specification Required [RFC8126]. Values with the first byte 255 (decimal) are reserved for Private Use [RFC8126]. Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
Value | Cipher Suite Name | Recommeded |
---|---|---|
0x00,0x01 | TLS_RSA_WITH_NULL_MD5 | D |
0x00,0x02 | TLS_RSA_WITH_NULL_SHA | D |
0x00,0x03 | TLS_RSA_EXPORT_WITH_RC4_40_MD5 | D |
0x00,0x04 | TLS_RSA_WITH_RC4_128_MD5 | D |
0x00,0x05 | TLS_RSA_WITH_RC4_128_SHA | D |
0x00,0x06 | TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 | D |
0x00,0x07 | TLS_RSA_WITH_IDEA_CBC_SHA | D |
0x00,0x08 | TLS_RSA_EXPORT_WITH_DES40_CBC_SHA | D |
0x00,0x09 | TLS_RSA_WITH_DES_CBC_SHA | D |
0x00,0x0B | TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA | D |
0x00,0x0C | TLS_DH_DSS_WITH_DES_CBC_SHA | D |
0x00,0x0D | TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA | D |
0x00,0x0E | TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA | D |
0x00,0x0F | TLS_DH_RSA_WITH_DES_CBC_SHA | D |
0x00,0x11 | TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA | D |
0x00,0x12 | TLS_DHE_DSS_WITH_DES_CBC_SHA | D |
0x00,0x13 | TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA | D |
0x00,0x14 | TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA | D |
0x00,0x15 | TLS_DHE_RSA_WITH_DES_CBC_SHA | D |
0x00,0x17 | TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 | D |
0x00,0x18 | TLS_DH_anon_WITH_RC4_128_MD5 | D |
0x00,0x19 | TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA | D |
0x00,0x1A | TLS_DH_anon_WITH_DES_CBC_SHA | D |
0x00,0x1B | TLS_DH_anon_WITH_3DES_EDE_CBC_SHA | D |
0x00,0x19 | TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA | D |
0x00,0x1E | TLS_KRB5_WITH_DES_CBC_SHA | D |
0x00,0x20 | TLS_KRB5_WITH_RC4_128_SHA | D |
0x00,0x21 | TLS_KRB5_WITH_IDEA_CBC_SHA | D |
0x00,0x22 | TLS_KRB5_WITH_DES_CBC_MD5 | D |
0x00,0x23 | TLS_KRB5_WITH_3DES_EDE_CBC_MD5 | D |
0x00,0x24 | TLS_KRB5_WITH_RC4_128_MD5 | D |
0x00,0x25 | TLS_KRB5_WITH_IDEA_CBC_MD5 | D |
0x00,0x26 | TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA | D |
0x00,0x27 | TLS_KRB5_EXPORT_WITH_RC2_CBC_40_SHA | D |
0x00,0x28 | TLS_KRB5_EXPORT_WITH_RC4_40_SHA | D |
0x00,0x29 | TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5 | D |
0x00,0x2A | TLS_KRB5_EXPORT_WITH_RC2_CBC_40_MD5 | D |
0x00,0x2B | TLS_KRB5_EXPORT_WITH_RC4_40_MD5 | D |
0x00,0x8A | TLS_PSK_WITH_RC4_128_SHA | D |
0x00,0x8E | TLS_DHE_PSK_WITH_RC4_128_SHA | D |
0x00,0x92 | TLS_RSA_PSK_WITH_RC4_128_SHA | D |
0xC0,0x02 | TLS_ECDH_ECDSA_WITH_RC4_128_SHA | D |
0xC0,0x07 | TLS_ECDHE_ECDSA_WITH_RC4_128_SHA | D |
0xC0,0x0C | TLS_ECDH_RSA_WITH_RC4_128_SHA | D |
0xC0,0x11 | TLS_ECDHE_RSA_WITH_RC4_128_SHA | D |
0xC0,0x16 | TLS_ECDH_anon_WITH_RC4_128_SHA | D |
0xC0,0x33 | TLS_ECDHE_PSK_WITH_RC4_128_SHA | D |
In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS Supported Groups registry as follows:¶
Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
This document updates the registration procedure for the TLS Exporter registry and updates the Recommended column allocation. IANA SHALL update the TLS Exporter Labels Registry as follows:¶
Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
The role of the designated expert is described in [RFC8447]. Even though this registry does not require a specification, the designated expert [RFC8126] will highly encourage registrants to provide a link to a publicly available specification. An Internet-Draft (that is posted and never published as an RFC) or a document from another standards body, industry consortium, university site, etc. are suitable for these purposes. The expert may provide more in-depth reviews, but their approval should not be taken as an endorsement of the exporter label. The expert also verifies that the label is a string consisting of printable ASCII characters beginning with "EXPORTER". IANA MUST also verify that one label is not a prefix of any other label. For example, labels "key" or "master secretary" are forbidden.¶
In order to refect the changes in the Recommended column allocation, IANA SHALL update the the TLS Certificate Types registry as follows:¶
Values in the range 0-223 (decimal) are assigned via Specification Required [RFC8126]. Values in the range 224-255 (decimal) are reserved for Private Use [RFC8126]. Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
Though TLS 1.0 and TLS 1.1 were deprecated [RFC8996], TLS 1.2 will be in use for some time. In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS HashAlgorithm Registry registry as follows:¶
Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
Value | Descsription | Recommended |
---|---|---|
0 | none | Y |
1 | md5 | D |
2 | sha1 | D |
3 | sha224 | D |
4 | sha256 | Y |
5 | sha384 | Y |
6 | sha512 | Y |
8 | Intrinsic | Y |
Though TLS 1.0 and TLS 1.1 were deprecated [RFC8996], TLS 1.2 will be in use for some time. In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS SignatureAlgorithm registry registry as follows:¶
Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
Value | Descsription | Recommended |
---|---|---|
0 | anonymous | N |
1 | rsa | Y |
2 | dsa | N |
3 | ecdsa | Y |
7 | ed25519 | Y |
8 | ed448 | Y |
64 | gostr34102012_256 | N |
65 | gostr34102012_512 | N |
Though TLS 1.0 and TLS 1.1 were deprecated [RFC8996], TLS 1.2 will be in use for some time. In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS ClientCertificateTypes registry as follows:¶
Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
Value | Descsription | Recommended |
---|---|---|
1 | rsa_sign | Y |
2 | dss_sign | N |
3 | rsa_fixed_dh | N |
4 | dss_fixed_dh | N |
5 | rsa_ephemeral_dh_RESERVED | D |
6 | dss_ephemeral_dh_RESERVED | D |
20 | fortezza_dms_RESERVED | D |
64 | ecdsa_sign | Y |
65 | rsa_fixed_ecdh | N |
66 | ecdsa_fixed_ecdh | N |
67 | gost_sign256 | N |
68 | gost_sign512 | N |
In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS PskKeyExchangeMode registry as follows:¶
Setting a "Recommended" column value to Y or D requires Standards Action {{RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Apporval.¶
The change to Specification Required from IETF Review lowers the amount of review provided by the WG for cipher suites and supported groups. This change reflects reality in that the WG essentially provided no cryptographic review of the cipher suites or supported groups. This was especially true of national cipher suites.¶
Recommended algorithms are regarded as secure for general use at the time of registration; however, cryptographic algorithms and parameters will be broken or weakened over time. It is possible that the "Recommended" status in the registry lags behind the most recent advances in cryptanalysis. Implementers and users need to check that the cryptographic algorithms listed continue to provide the expected level of security.¶
Designated experts ensure the specification is publicly available. They may provide more in-depth reviews. Their review should not be taken as an endorsement of the cipher suite, extension, supported group, etc.¶
This document is entirely about changes to TLS-related IANA registries.¶