NETCONF Working Group K. Watsen Internet-Draft Watsen Networks Intended status: Standards Track 16 March 2024 Expires: 17 September 2024 YANG Groupings for SSH Clients and SSH Servers draft-ietf-netconf-ssh-client-server-40 Abstract This document presents seven YANG 1.1 modules. Three IETF modules, and four supporting IANA modules. The three IETF modules are: ietf-ssh-common, ietf-ssh-client, and ietf-ssh-server. The "ietf-ssh-client" and "ietf-ssh-server" modules are the primary productions of this work, supporting the configuration and monitoring of SSH clients and servers. The four IANA modules are: iana-ssh-encryption-algs, iana-ssh-key- exchange-algs, iana-ssh-mac-algs, and iana-ssh-public-key-algs. These modules each define YANG enumerations providing support for an IANA-maintained algorithm registry. Editorial Note (To be removed by RFC Editor) This draft contains placeholder values that need to be replaced with finalized values at the time of publication. This note summarizes all of the substitutions that are needed. No other RFC Editor instructions are specified elsewhere in this document. Artwork in this document contains shorthand references to drafts in progress. Please apply the following replacements: * AAAA --> the assigned RFC value for draft-ietf-netconf-crypto- types * BBBB --> the assigned RFC value for draft-ietf-netconf-trust- anchors * CCCC --> the assigned RFC value for draft-ietf-netconf-keystore * DDDD --> the assigned RFC value for draft-ietf-netconf-tcp-client- server * EEEE --> the assigned RFC value for this draft Watsen Expires 17 September 2024 [Page 1] Internet-Draft Groupings for SSH Clients and Servers March 2024 Artwork in this document contains placeholder values for the date of publication of this draft. Please apply the following replacement: * 2024-03-16 --> the publication date of this draft The "Relation to other RFCs" section Section 1.2 contains the text "one or more YANG modules" and, later, "modules". This text is sourced from a file in a context where it is unknown how many modules a draft defines. The text is not wrong as is, but it may be improved by stating more directly how many modules are defined. The "Relation to other RFCs" section Section 1.2 contains a self- reference to this draft, along with a corresponding reference in the Appendix. Please replace the self-reference in this section with "This RFC" (or similar) and remove the self-reference in the "Normative/Informative References" section, whichever it is in. Tree-diagrams in this draft may use the '\' line-folding mode defined in RFC 8792. However, nicer-to-the-eye is when the '\\' line-folding mode is used. The AD suggested suggested putting a request here for the RFC Editor to help convert "ugly" '\' folded examples to use the '\\' folding mode. "Help convert" may be interpreted as, identify what looks ugly and ask the authors to make the adjustment. The following Appendix sections are to be removed prior to publication: * Appendix A.1. Initial Module for the "Encryption Algorithm Names" Registry * Appendix A.2. Initial Module for the "MAC Algorithm Names" Registry * Appendix A.3. Initial Module for the "Public Key Algorithm Names" Registry * Appendix A.4. Initial Module for the "Key Exchange Method Names" Registry * Appendix B. Change Log Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Watsen Expires 17 September 2024 [Page 2] Internet-Draft Groupings for SSH Clients and Servers March 2024 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/. 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 17 September 2024. Copyright Notice Copyright (c) 2024 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 . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1. Regarding the IETF Modules . . . . . . . . . . . . . . . 6 1.2. Relation to other RFCs . . . . . . . . . . . . . . . . . 6 1.3. Specification Language . . . . . . . . . . . . . . . . . 8 1.4. Adherence to the NMDA . . . . . . . . . . . . . . . . . . 8 1.5. Conventions . . . . . . . . . . . . . . . . . . . . . . . 8 2. The "ietf-ssh-common" Module . . . . . . . . . . . . . . . . 9 2.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 9 2.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 12 2.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 14 3. The "ietf-ssh-client" Module . . . . . . . . . . . . . . . . 24 3.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 24 3.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 27 3.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 31 4. The "ietf-ssh-server" Module . . . . . . . . . . . . . . . . 39 4.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 39 4.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 41 4.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 45 5. Security Considerations . . . . . . . . . . . . . . . . . . . 54 Watsen Expires 17 September 2024 [Page 3] Internet-Draft Groupings for SSH Clients and Servers March 2024 5.1. Considerations for the "iana-ssh-key-exchange-algs" Module . . . . . . . . . . . . . . . . . . . . . . . . . 54 5.2. Considerations for the "iana-ssh-encryption-algs" Module . . . . . . . . . . . . . . . . . . . . . . . . . 55 5.3. Considerations for the "iana-ssh-mac-algs" Module . . . . 56 5.4. Considerations for the "iana-ssh-public-key-algs" Module . . . . . . . . . . . . . . . . . . . . . . . . . 56 5.5. Considerations for the "ietf-ssh-common" YANG Module . . 57 5.6. Considerations for the "ietf-ssh-client" YANG Module . . 57 5.7. Considerations for the "ietf-ssh-server" YANG Module . . 58 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 59 6.1. The "IETF XML" Registry . . . . . . . . . . . . . . . . . 59 6.2. The "YANG Module Names" Registry . . . . . . . . . . . . 60 6.3. Considerations for the "iana-ssh-encryption-algs" Module . . . . . . . . . . . . . . . . . . . . . . . . . 61 6.4. Considerations for the "iana-ssh-mac-algs" Module . . . . 63 6.5. Considerations for the "iana-ssh-public-key-algs" Module . . . . . . . . . . . . . . . . . . . . . . . . . 64 6.6. Considerations for the "iana-ssh-key-exchange-algs" Module . . . . . . . . . . . . . . . . . . . . . . . . . 66 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 68 7.1. Normative References . . . . . . . . . . . . . . . . . . 68 7.2. Informative References . . . . . . . . . . . . . . . . . 70 Appendix A. Script to Generate IANA-Maintained YANG Modules . . 73 A.1. Initial Module for the "Encryption Algorithm Names" Registry . . . . . . . . . . . . . . . . . . . . . . . . 80 A.2. Initial Module for the "MAC Algorithm Names" Registry . . 88 A.3. Initial Module for the "Public Key Algorithm Names" Registry . . . . . . . . . . . . . . . . . . . . . . . . 91 A.4. Initial Module for the "Key Exchange Method Names" Registry . . . . . . . . . . . . . . . . . . . . . . . . 99 Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 143 B.1. 00 to 01 . . . . . . . . . . . . . . . . . . . . . . . . 143 B.2. 01 to 02 . . . . . . . . . . . . . . . . . . . . . . . . 143 B.3. 02 to 03 . . . . . . . . . . . . . . . . . . . . . . . . 143 B.4. 03 to 04 . . . . . . . . . . . . . . . . . . . . . . . . 143 B.5. 04 to 05 . . . . . . . . . . . . . . . . . . . . . . . . 144 B.6. 05 to 06 . . . . . . . . . . . . . . . . . . . . . . . . 144 B.7. 06 to 07 . . . . . . . . . . . . . . . . . . . . . . . . 144 B.8. 07 to 08 . . . . . . . . . . . . . . . . . . . . . . . . 144 B.9. 08 to 09 . . . . . . . . . . . . . . . . . . . . . . . . 145 B.10. 09 to 10 . . . . . . . . . . . . . . . . . . . . . . . . 145 B.11. 10 to 11 . . . . . . . . . . . . . . . . . . . . . . . . 145 B.12. 11 to 12 . . . . . . . . . . . . . . . . . . . . . . . . 145 B.13. 12 to 13 . . . . . . . . . . . . . . . . . . . . . . . . 145 B.14. 13 to 14 . . . . . . . . . . . . . . . . . . . . . . . . 146 B.15. 14 to 15 . . . . . . . . . . . . . . . . . . . . . . . . 146 B.16. 15 to 16 . . . . . . . . . . . . . . . . . . . . . . . . 146 Watsen Expires 17 September 2024 [Page 4] Internet-Draft Groupings for SSH Clients and Servers March 2024 B.17. 16 to 17 . . . . . . . . . . . . . . . . . . . . . . . . 146 B.18. 17 to 18 . . . . . . . . . . . . . . . . . . . . . . . . 146 B.19. 18 to 19 . . . . . . . . . . . . . . . . . . . . . . . . 147 B.20. 19 to 20 . . . . . . . . . . . . . . . . . . . . . . . . 147 B.21. 20 to 21 . . . . . . . . . . . . . . . . . . . . . . . . 148 B.22. 21 to 22 . . . . . . . . . . . . . . . . . . . . . . . . 148 B.23. 22 to 23 . . . . . . . . . . . . . . . . . . . . . . . . 148 B.24. 23 to 24 . . . . . . . . . . . . . . . . . . . . . . . . 148 B.25. 24 to 25 . . . . . . . . . . . . . . . . . . . . . . . . 149 B.26. 25 to 26 . . . . . . . . . . . . . . . . . . . . . . . . 149 B.27. 26 to 27 . . . . . . . . . . . . . . . . . . . . . . . . 149 B.28. 27 to 28 . . . . . . . . . . . . . . . . . . . . . . . . 149 B.29. 28 to 29 . . . . . . . . . . . . . . . . . . . . . . . . 149 B.30. 29 to 30 . . . . . . . . . . . . . . . . . . . . . . . . 149 B.31. 30 to 31 . . . . . . . . . . . . . . . . . . . . . . . . 150 B.32. 31 to 32 . . . . . . . . . . . . . . . . . . . . . . . . 150 B.33. 32 to 33 . . . . . . . . . . . . . . . . . . . . . . . . 150 B.34. 33 to 34 . . . . . . . . . . . . . . . . . . . . . . . . 150 B.35. 34 to 35 . . . . . . . . . . . . . . . . . . . . . . . . 151 B.36. 35 to 36 . . . . . . . . . . . . . . . . . . . . . . . . 151 B.37. 36 to 38 . . . . . . . . . . . . . . . . . . . . . . . . 151 B.38. 38 to 39 . . . . . . . . . . . . . . . . . . . . . . . . 151 B.39. 39 to 40 . . . . . . . . . . . . . . . . . . . . . . . . 151 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 152 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 152 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 152 1. Introduction This document presents seven YANG 1.1 [RFC7950] modules. Three "IETF" modules and four "IANA" modules. The three IETF modules are ietf-ssh-common (Section 2), ietf-ssh- client (Section 3), and ietf-ssh-server (Section 4). The "ietf-ssh- client" and "ietf-ssh-server" modules are the primary productions of this work, supporting the configuration and monitoring of SSH clients and servers. The groupings defined in this document are expected to be used in conjunction with the groupings defined in an underlying transport- level module, such as the groupings defined in [I-D.ietf-netconf-tcp-client-server]. The transport-level data model enables the configuration of transport-level values such as a remote address, a remote port, a local address, and a local port. Watsen Expires 17 September 2024 [Page 5] Internet-Draft Groupings for SSH Clients and Servers March 2024 The four IANA modules are: iana-ssh-encryption-algs (Appendix A.1), iana-ssh-key-exchange-algs (Appendix A.4), iana-ssh-mac-algs (Appendix A.2), and iana-ssh-public-key-algs (Appendix A.3). These modules each define YANG enumerations providing support for an IANA- maintained algorithm registry. This document assumes that the four IANA modules exist, and presents a script in Appendix A that IANA may use to generate the YANG modules. This document does not publish initial versions of these four modules. IANA publishes these modules. 1.1. Regarding the IETF Modules The three IETF modules define features and groupings to model "generic" SSH clients and SSH servers, where "generic" should be interpreted as "least common denominator" rather than "complete." Basic SSH protocol ([RFC4252], [RFC4253], and [RFC4254]) support is afforded by these modules, leaving configuration of advance features (e.g., multiple channels) to augmentations made by consuming modules. It is intended that the YANG groupings will be used by applications needing to configure SSH client and server protocol stacks. For instance, these groupings are used to help define the data model for NETCONF over SSH [RFC6242] based clients and servers in [I-D.ietf-netconf-netconf-client-server]. The ietf-ssh-client and ietf-ssh-server YANG modules each define one grouping, which is focused on just SSH-specific configuration, and specifically avoids any transport-level configuration, such as what ports to listen on or connect to. This affords applications the opportunity to define their own strategy for how the underlying TCP connection is established. For instance, applications supporting NETCONF Call Home [RFC8071] could use the "ssh-server-grouping" grouping for the SSH parts it provides, while adding data nodes for the TCP-level call-home configuration. The modules defined in this document optionally support [RFC6187] enabling X.509v3 certificate based host keys and public keys. 1.2. Relation to other RFCs This document presents one or more YANG modules [RFC7950] that are part of a collection of RFCs that work together to, ultimately, support the configuration of both the clients and servers of both the NETCONF [RFC6241] and RESTCONF [RFC8040] protocols. Watsen Expires 17 September 2024 [Page 6] Internet-Draft Groupings for SSH Clients and Servers March 2024 The dependency relationship between the primary YANG groupings defined in the various RFCs is presented in the below diagram. In some cases, a draft may define secondary groupings that introduce dependencies not illustrated in the diagram. The labels in the diagram are a shorthand name for the defining RFC. The citation reference for shorthand name is provided below the diagram. Please note that the arrows in the diagram point from referencer to referenced. For example, the "crypto-types" RFC does not have any dependencies, whilst the "keystore" RFC depends on the "crypto-types" RFC. crypto-types ^ ^ / \ / \ truststore keystore ^ ^ ^ ^ | +---------+ | | | | | | | +------------+ | tcp-client-server | / | | ^ ^ ssh-client-server | | | | ^ tls-client-server | | | ^ ^ http-client-server | | | | | ^ | | | +-----+ +---------+ | | | | | | | | +-----------|--------|--------------+ | | | | | | | | +-----------+ | | | | | | | | | | | | | | | | | netconf-client-server restconf-client-server Watsen Expires 17 September 2024 [Page 7] Internet-Draft Groupings for SSH Clients and Servers March 2024 +======================+===========================================+ |Label in Diagram | Originating RFC | +======================+===========================================+ |crypto-types | [I-D.ietf-netconf-crypto-types] | +----------------------+-------------------------------------------+ |truststore | [I-D.ietf-netconf-trust-anchors] | +----------------------+-------------------------------------------+ |keystore | [I-D.ietf-netconf-keystore] | +----------------------+-------------------------------------------+ |tcp-client-server | [I-D.ietf-netconf-tcp-client-server] | +----------------------+-------------------------------------------+ |ssh-client-server | [I-D.ietf-netconf-ssh-client-server] | +----------------------+-------------------------------------------+ |tls-client-server | [I-D.ietf-netconf-tls-client-server] | +----------------------+-------------------------------------------+ |http-client-server | [I-D.ietf-netconf-http-client-server] | +----------------------+-------------------------------------------+ |netconf-client-server | [I-D.ietf-netconf-netconf-client-server] | +----------------------+-------------------------------------------+ |restconf-client-server| [I-D.ietf-netconf-restconf-client-server] | +----------------------+-------------------------------------------+ Table 1: Label in Diagram to RFC Mapping 1.3. Specification Language 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. 1.4. Adherence to the NMDA This document is compliant with the Network Management Datastore Architecture (NMDA) [RFC8342]. For instance, as described in [I-D.ietf-netconf-trust-anchors] and [I-D.ietf-netconf-keystore], trust anchors and keys installed during manufacturing are expected to appear in (Section 5.3 of [RFC8342]), and [I-D.ietf-netmod-system-config], if implemented. 1.5. Conventions Various examples in this document use "BASE64VALUE=" as a placeholder value for binary data that has been base64 encoded (per Section 9.8 of [RFC7950]). This placeholder value is used because real base64 encoded structures are often many lines long and hence distracting to the example being presented. Watsen Expires 17 September 2024 [Page 8] Internet-Draft Groupings for SSH Clients and Servers March 2024 2. The "ietf-ssh-common" Module The SSH common model presented in this section contains features and groupings common to both SSH clients and SSH servers. The "transport-params-grouping" grouping can be used to configure the list of SSH transport algorithms permitted by the SSH client or SSH server. The lists of permitted algorithms are in decreasing order of usage preference. The algorithm that appears first in the client list that also appears in the server list is the one that is used for the SSH transport layer connection. The ability to restrict the algorithms allowed is provided in this grouping for SSH clients and SSH servers that are capable of doing so and may serve to make SSH clients and SSH servers compliant with security policies. 2.1. Data Model Overview This section provides an overview of the "ietf-ssh-common" module in terms of its features, identities, and groupings. 2.1.1. Features The following diagram lists all the "feature" statements defined in the "ietf-ssh-common" module: Features: +-- ssh-x509-certs +-- transport-params +-- asymmetric-key-pair-generation +-- algorithm-discovery The diagram above uses syntax that is similar to but not defined in [RFC8340]. Please refer to the YANG module for a description of each feature. 2.1.2. Groupings The "ietf-ssh-common" module defines the following "grouping" statement: * transport-params-grouping This grouping is presented in the following subsection. 2.1.2.1. The "transport-params-grouping" Grouping The following tree diagram [RFC8340] illustrates the "transport- params-grouping" grouping: Watsen Expires 17 September 2024 [Page 9] Internet-Draft Groupings for SSH Clients and Servers March 2024 grouping transport-params-grouping: +-- host-key | +-- host-key-alg* ssh-public-key-algorithm +-- key-exchange | +-- key-exchange-alg* ssh-key-exchange-algorithm +-- encryption | +-- encryption-alg* ssh-encryption-algorithm +-- mac +-- mac-alg* ssh-mac-algorithm Comments: * This grouping is used by both the "ssh-client-grouping" and the "ssh-server-grouping" groupings defined in Section 3.1.2.1 and Section 4.1.2.1, respectively. * This grouping enables client and server configurations to specify the algorithms that are to be used when establishing SSH sessions. * Each list is "ordered-by user". 2.1.3. Protocol-accessible Nodes The following tree diagram [RFC8340] lists all the protocol- accessible nodes defined in the "ietf-ssh-common" module, without expanding the "grouping" statements: Watsen Expires 17 September 2024 [Page 10] Internet-Draft Groupings for SSH Clients and Servers March 2024 module: ietf-ssh-common +--ro supported-algorithms {algorithm-discovery}? +--ro public-key-algorithms | +--ro supported-algorithm* ssh-public-key-algorithm +--ro encryption-algorithms | +--ro supported-algorithm* ssh-encryption-algorithm +--ro key-exchange-algorithms | +--ro supported-algorithm* ssh-key-exchange-algorithm +--ro mac-algorithms +--ro supported-algorithm* ssh-mac-algorithm rpcs: +---x generate-asymmetric-key-pair {asymmetric-key-pair-generation}? +---w input | +---w algorithm ssh-public-key-algorithm | +---w num-bits? uint16 | +---w private-key-encoding | +---w (private-key-encoding) | +--:(cleartext) {ct:cleartext-private-keys}? | | +---w cleartext? empty | +--:(encrypted) {ct:encrypted-private-keys}? | | +---w encrypted | | +---w ks:encrypted-by-grouping | +--:(hidden) {ct:hidden-private-keys}? | +---w hidden? empty +--ro output +--ro (key-or-hidden)? +--:(key) | +---u ct:asymmetric-key-pair-grouping +--:(hidden) +--ro location? instance-identifier Comments: * Protocol-accessible nodes are those nodes that are accessible when the module is "implemented", as described in Section 5.6.5 of [RFC7950]. * The protocol-accessible nodes for the "ietf-ssh-common" module are limited to "supported-algorithms" container, which is constrained by the "algorithm-discovery" feature, and the RPC "generate- asymmetric-key-pair", which is constrained by the "asymmetric-key- pair-generation" feature. * The "encrypted-by-grouping" grouping is discussed in Section 2.1.3.1 of [I-D.ietf-netconf-keystore]. Watsen Expires 17 September 2024 [Page 11] Internet-Draft Groupings for SSH Clients and Servers March 2024 * The "asymmetric-key-pair-grouping" grouping is discussed in Section 2.1.4.6 of [I-D.ietf-netconf-crypto-types]. 2.2. Example Usage The following example illustrates the "transport-params-grouping' grouping when populated with some data. =============== NOTE: '\' line wrapping per RFC 8792 ================ x509v3-rsa2048-sha256 ssh-rsa ssh-rsa@openssh.com diffie-hellman-group-exchange-sha256 aes256-ctr aes192-ctr aes128-ctr aes256-gcm@openssh.com hmac-sha2-256 hmac-sha2-512 The following example illustrates operational state data indicating the SSH algorithms supported by the server. Watsen Expires 17 September 2024 [Page 12] Internet-Draft Groupings for SSH Clients and Servers March 2024 =============== NOTE: '\' line wrapping per RFC 8792 ================ aes256-ctr arcfour256 serpent256-ctr AEAD_AES_128_GCM AEAD_AES_256_GCM aes256-gcm@openssh.com ecdh-sha2-nistp256 rsa2048-sha256 gss-group14-sha1-nistp256 gss-gex-sha1-nistp256 gss-group14-sha256-1.2.840.10045.3.1.1 curve25519-sha256 hmac-sha2-256 hmac-sha2-512 AEAD_AES_256_GCM rsa-sha2-256 rsa-sha2-512 spki-sign-rsa pgp-sign-dss x509v3-rsa2048-sha256 ecdsa-sha2-nistp256 ecdsa-sha2-1.3.132.0.37 ssh-ed25519 ssh-rsa@openssh.com The following example illustrates the "generate-asymmetric-key-pair" RPC. REQUEST Watsen Expires 17 September 2024 [Page 13] Internet-Draft Groupings for SSH Clients and Servers March 2024 =============== NOTE: '\' line wrapping per RFC 8792 ================ ecdsa-sha2-nistp256 521 hidden-asymmetric-key RESPONSE =============== NOTE: '\' line wrapping per RFC 8792 ================ ct:subject-public-key-info-format BASE64VALUE= ct:ec-private-key-format BASE64VALUE= 2.3. YANG Module This YANG module has normative references to [RFC4253], [RFC4344], [RFC4419], [RFC5656], [RFC6187], [RFC6668], and [FIPS_186-6]. file "ietf-ssh-common@2024-03-16.yang" module ietf-ssh-common { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-ssh-common"; prefix sshcmn; import iana-ssh-encryption-algs { prefix sshea; Watsen Expires 17 September 2024 [Page 14] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } import iana-ssh-key-exchange-algs { prefix sshkea; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } import iana-ssh-mac-algs { prefix sshma; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } import iana-ssh-public-key-algs { prefix sshpka; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } import ietf-crypto-types { prefix ct; reference "RFC AAAA: YANG Data Types and Groupings for Cryptography"; } import ietf-keystore { prefix ks; reference "RFC CCCC: A YANG Data Model for a Keystore"; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: https://datatracker.ietf.org/wg/netconf WG List: NETCONF WG list Author: Kent Watsen Author: Gary Wu "; description "This module defines a common features and groupings for Secure Shell (SSH). Copyright (c) 2024 IETF Trust and the persons identified Watsen Expires 17 September 2024 [Page 15] Internet-Draft Groupings for SSH Clients and Servers March 2024 as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC EEEE (https://www.rfc-editor.org/info/rfcEEEE); see the RFC itself for full legal notices. 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 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; revision 2024-03-16 { description "Initial version"; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } // Features feature ssh-x509-certs { description "X.509v3 certificates are supported for SSH."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } feature transport-params { description "SSH transport layer parameters are configurable."; } feature asymmetric-key-pair-generation { description "Indicates that the server implements the 'generate-asymmetric-key-pair' RPC."; } Watsen Expires 17 September 2024 [Page 16] Internet-Draft Groupings for SSH Clients and Servers March 2024 feature algorithm-discovery { description "Indicates that the server implements the 'supported-algorithms' container."; } // Typedefs typedef ssh-public-key-algorithm { type union { type sshpka:ssh-public-key-algorithm; type string { length "1..64" { description "Non IANA-maintained algorithms must include the 'at-sign' (@) in them, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers"; } pattern ".*@.*" { description "Non IANA-maintained algorithms must include the 'at-sign' (@) in them, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers"; } } } description "A type that enables the public key algorithm to be either an IANA-maintained public key algorithm in the 'iana-ssh-public-key-algs' YANG module (RFC EEEE), or a locally-defined algorithm, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } typedef ssh-key-exchange-algorithm { type union { type sshkea:ssh-key-exchange-algorithm; type string { length "1..64" { description "Non IANA-maintained algorithms must include the Watsen Expires 17 September 2024 [Page 17] Internet-Draft Groupings for SSH Clients and Servers March 2024 'at-sign' (@) in them, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers"; } pattern ".*@.*" { description "Non IANA-maintained algorithms must include the 'at-sign' (@) in them, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers"; } } } description "A type that enables the key exchange algorithm to be either an IANA-maintained key exchange algorithm in the 'iana-ssh-key-exchange-algs' YANG module (RFC EEEE), or a locally-defined algorithm, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } typedef ssh-encryption-algorithm { type union { type sshea:ssh-encryption-algorithm; type string { length "1..64" { description "Non IANA-maintained algorithms must include the 'at-sign' (@) in them, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers"; } pattern ".*@.*" { description "Non IANA-maintained algorithms must include the 'at-sign' (@) in them, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers"; } } } Watsen Expires 17 September 2024 [Page 18] Internet-Draft Groupings for SSH Clients and Servers March 2024 description "A type that enables the encryption algorithm to be either an IANA-maintained encryption algorithm in the 'iana-ssh-encryption-algs' YANG module (RFC EEEE), or a locally-defined algorithm, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } typedef ssh-mac-algorithm { type union { type sshma:ssh-mac-algorithm; type string { length "1..64" { description "Non IANA-maintained algorithms must include the 'at-sign' (@) in them, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers"; } pattern ".*@.*" { description "Non IANA-maintained algorithms must include the 'at-sign' (@) in them, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers"; } } } description "A type that enables the MAC algorithm to be either an IANA-maintained MAC algorithm in the 'iana-ssh-mac-algs' YANG module (RFC EEEE), or a locally-defined algorithm, per Section 4.6.1 of RFC 4250."; reference "RFC 4250: SSH Protocol Assigned Numbers RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } // Groupings grouping transport-params-grouping { description Watsen Expires 17 September 2024 [Page 19] Internet-Draft Groupings for SSH Clients and Servers March 2024 "A reusable grouping for SSH transport parameters."; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; container host-key { description "Parameters regarding host key."; leaf-list host-key-alg { type ssh-public-key-algorithm; ordered-by user; description "Acceptable host key algorithms in order of decreasing preference. If this leaf-list is not configured (has zero elements) the acceptable host key algorithms are implementation- defined."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } } container key-exchange { description "Parameters regarding key exchange."; leaf-list key-exchange-alg { type ssh-key-exchange-algorithm; ordered-by user; description "Acceptable key exchange algorithms in order of decreasing preference. If this leaf-list is not configured (has zero elements) the acceptable key exchange algorithms are implementation defined."; } } container encryption { description "Parameters regarding encryption."; leaf-list encryption-alg { type ssh-encryption-algorithm; ordered-by user; description "Acceptable encryption algorithms in order of decreasing preference. If this leaf-list is not configured (has zero elements) the acceptable encryption algorithms are implementation defined."; Watsen Expires 17 September 2024 [Page 20] Internet-Draft Groupings for SSH Clients and Servers March 2024 } } container mac { description "Parameters regarding message authentication code (MAC)."; leaf-list mac-alg { type ssh-mac-algorithm; ordered-by user; description "Acceptable MAC algorithms in order of decreasing preference. If this leaf-list is not configured (has zero elements) the acceptable MAC algorithms are implementation- defined."; } } } // Protocol-accessible Nodes container supported-algorithms { if-feature "algorithm-discovery"; config false; description "Identifies all of the supported algorithms."; container public-key-algorithms { description "A container for a list of public key algorithms supported by the server."; leaf-list supported-algorithm { type ssh-public-key-algorithm; description "A public key algorithm supported by the server."; } } container encryption-algorithms { description "A container for a list of encryption algorithms supported by the server."; leaf-list supported-algorithm { type ssh-encryption-algorithm; description "An encryption algorithm supported by the server."; } } container key-exchange-algorithms { config false; Watsen Expires 17 September 2024 [Page 21] Internet-Draft Groupings for SSH Clients and Servers March 2024 description "A container for a list of key exchange algorithms supported by the server."; leaf-list supported-algorithm { type ssh-key-exchange-algorithm; description "A key exchange algorithm supported by the server."; } } container mac-algorithms { config false; description "A container for a list of MAC algorithms supported by the server."; leaf-list supported-algorithm { type ssh-mac-algorithm; description "A MAC algorithm supported by the server."; } } } rpc generate-asymmetric-key-pair { if-feature "asymmetric-key-pair-generation"; description "Requests the device to generate a public key using the specified key algorithm."; input { leaf algorithm { type ssh-public-key-algorithm; mandatory true; description "The algorithm to be used when generating the key."; } leaf num-bits { type uint16; description "Specifies the number of bits in the key to create. For RSA keys, the minimum size is 1024 bits and the default is 3072 bits. Generally, 3072 bits is considered sufficient. DSA keys must be exactly 1024 bits as specified by FIPS 186-6. For ECDSA keys, the 'num-bits' value determines the key length by selecting from one of three elliptic curve sizes: 256, 384 or 521 bits. Attempting to use bit lengths other than these three values for ECDSA keys will fail. ECDSA-SK, Ed25519 and Ed25519-SK keys have a fixed length and thus the 'num-bits' value is not specified."; Watsen Expires 17 September 2024 [Page 22] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "FIPS 186-6: Digital Signature Standard (DSS)"; } container private-key-encoding { description "Indicates how the private key is to be encoded."; choice private-key-encoding { mandatory true; description "A choice amongst optional private key handling."; case cleartext { if-feature "ct:cleartext-private-keys"; leaf cleartext { type empty; description "Indicates that the private key is to be returned as a cleartext value."; } } case encrypted { if-feature "ct:encrypted-private-keys"; container encrypted { description "Indicates that the private key is to be encrypted using the specified symmetric or asymmetric key."; uses ks:encrypted-by-grouping; } } case hidden { if-feature "ct:hidden-private-keys"; leaf hidden { type empty; description "Indicates that the private key is to be hidden. Unlike the 'cleartext' and 'encrypt' options, the key returned is a placeholder for an internally stored key. See the 'Support for Built-in Keys' section in RFC CCCC for information about hidden keys. It is expected that the server will instantiate the hidden key in the same location where built-in keys are located. Rather than return the key, just the key's location is returned in the output."; } } } Watsen Expires 17 September 2024 [Page 23] Internet-Draft Groupings for SSH Clients and Servers March 2024 } } output { choice key-or-hidden { case key { uses ct:asymmetric-key-pair-grouping; } case hidden { leaf location { type instance-identifier; description "The location to where a hidden key was created."; } } description "The output can be either a key (for cleartext and encrypted keys) or the location to where the key was created (for hidden keys)."; } } } // end generate-asymmetric-key-pair } 3. The "ietf-ssh-client" Module This section defines a YANG 1.1 [RFC7950] module called "ietf-ssh- client". A high-level overview of the module is provided in Section 3.1. Examples illustrating the module's use are provided in Examples (Section 3.2). The YANG module itself is defined in Section 3.3. 3.1. Data Model Overview This section provides an overview of the "ietf-ssh-client" module in terms of its features and groupings. 3.1.1. Features The following diagram lists all the "feature" statements defined in the "ietf-ssh-client" module: Watsen Expires 17 September 2024 [Page 24] Internet-Draft Groupings for SSH Clients and Servers March 2024 Features: +-- ssh-client-keepalives +-- client-ident-password +-- client-ident-publickey +-- client-ident-hostbased +-- client-ident-none The diagram above uses syntax that is similar to but not defined in [RFC8340]. Please refer to the YANG module for a description of each feature. 3.1.2. Groupings The "ietf-ssh-client" module defines the following "grouping" statement: * ssh-client-grouping This grouping is presented in the following subsection. 3.1.2.1. The "ssh-client-grouping" Grouping The following tree diagram [RFC8340] illustrates the "ssh-client- grouping" grouping: Watsen Expires 17 September 2024 [Page 25] Internet-Draft Groupings for SSH Clients and Servers March 2024 =============== NOTE: '\' line wrapping per RFC 8792 ================ grouping ssh-client-grouping: +-- client-identity | +-- username? string | +-- public-key! {client-ident-publickey}? | | +---u ks:inline-or-keystore-asymmetric-key-grouping | +-- password! {client-ident-password}? | | +---u ct:password-grouping | +-- hostbased! {client-ident-hostbased}? | | +---u ks:inline-or-keystore-asymmetric-key-grouping | +-- none? empty {client-ident-none}? | +-- certificate! {sshcmn:ssh-x509-certs}? | +---u ks:inline-or-keystore-end-entity-cert-with-key-group\ ing +-- server-authentication | +-- ssh-host-keys! | | +---u ts:inline-or-truststore-public-keys-grouping | +-- ca-certs! {sshcmn:ssh-x509-certs}? | | +---u ts:inline-or-truststore-certs-grouping | +-- ee-certs! {sshcmn:ssh-x509-certs}? | +---u ts:inline-or-truststore-certs-grouping +-- transport-params {sshcmn:transport-params}? | +---u sshcmn:transport-params-grouping +-- keepalives! {ssh-client-keepalives}? +-- max-wait? uint16 +-- max-attempts? uint8 Comments: * The "client-identity" node configures a "username" and authentication methods, each enabled by a "feature" statement defined in Section 3.1.1. * The "server-authentication" node configures trust anchors for authenticating the SSH server, with each option enabled by a "feature" statement. * The "transport-params" node, which must be enabled by a feature, configures parameters for the SSH sessions established by this configuration. * The "keepalives" node, which must be enabled by a feature, configures a "presence" container for testing the aliveness of the SSH server. The aliveness-test occurs at the SSH protocol layer. * For the referenced grouping statement(s): Watsen Expires 17 September 2024 [Page 26] Internet-Draft Groupings for SSH Clients and Servers March 2024 - The "inline-or-keystore-asymmetric-key-grouping" grouping is discussed in Section 2.1.3.4 of [I-D.ietf-netconf-keystore]. - The "inline-or-keystore-end-entity-cert-with-key-grouping" grouping is discussed in Section 2.1.3.6 of [I-D.ietf-netconf-keystore]. - The "inline-or-truststore-public-keys-grouping" grouping is discussed in Section 2.1.3.4 of [I-D.ietf-netconf-trust-anchors]. - The "inline-or-truststore-certs-grouping" grouping is discussed in Section 2.1.3.3 of [I-D.ietf-netconf-trust-anchors]. - The "transport-params-grouping" grouping is discussed in Section 2.1.2.1 in this document. 3.1.3. Protocol-accessible Nodes The "ietf-ssh-client" module defines only "grouping" statements that are used by other modules to instantiate protocol-accessible nodes. Thus this module, when implemented, does not itself define any protocol-accessible nodes. 3.2. Example Usage This section presents two examples showing the "ssh-client-grouping" grouping populated with some data. These examples are effectively the same except the first configures the client identity using a inlined key while the second uses a key configured in a keystore. Both examples are consistent with the examples presented in Section 2.2.1 of [I-D.ietf-netconf-trust-anchors] and Section 2.2.1 of [I-D.ietf-netconf-keystore]. The following configuration example uses inline-definitions for the client identity and server authentication: =============== NOTE: '\' line wrapping per RFC 8792 ================ foobar ct:rsa-private-key-format BASE64VALUE= corp-fw1 ct:ssh-public-key-format BASE64VALUE= corp-fw2 ct:ssh-public-key-format BASE64VALUE= Server Cert Issuer #1 BASE64VALUE= Server Cert Issuer #2 BASE64VALUE= My Application #1 BASE64VALUE= My Application #2 BASE64VALUE= Watsen Expires 17 September 2024 [Page 28] Internet-Draft Groupings for SSH Clients and Servers March 2024 30 3 The following configuration example uses central-keystore-references for the client identity and central-truststore-references for server authentication: from the keystore: Watsen Expires 17 September 2024 [Page 29] Internet-Draft Groupings for SSH Clients and Servers March 2024 =============== NOTE: '\' line wrapping per RFC 8792 ================ foobar ssh-rsa-key ssh-rsa-key-with-cert ex-rsa-cert2 trusted-ssh-public-keys trusted-server-ca-certs trusted-server-ee-certs 30 3 Watsen Expires 17 September 2024 [Page 30] Internet-Draft Groupings for SSH Clients and Servers March 2024 3.3. YANG Module This YANG module has normative references to [RFC4252], [RFC4254], [RFC8341], [I-D.ietf-netconf-crypto-types], [I-D.ietf-netconf-trust-anchors], and [I-D.ietf-netconf-keystore]. file "ietf-ssh-client@2024-03-16.yang" module ietf-ssh-client { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-ssh-client"; prefix sshc; import ietf-netconf-acm { prefix nacm; reference "RFC 8341: Network Configuration Access Control Model"; } import ietf-crypto-types { prefix ct; reference "RFC AAAA: YANG Data Types and Groupings for Cryptography"; } import ietf-truststore { prefix ts; reference "RFC BBBB: A YANG Data Model for a Truststore"; } import ietf-keystore { prefix ks; reference "RFC CCCC: A YANG Data Model for a Keystore"; } import ietf-ssh-common { prefix sshcmn; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: https://datatracker.ietf.org/wg/netconf Watsen Expires 17 September 2024 [Page 31] Internet-Draft Groupings for SSH Clients and Servers March 2024 WG List: NETCONF WG list Author: Kent Watsen "; description "This module defines a reusable grouping for SSH clients that can be used as a basis for specific SSH client instances. Copyright (c) 2024 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC EEEE (https://www.rfc-editor.org/info/rfcEEEE); see the RFC itself for full legal notices. 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 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; revision 2024-03-16 { description "Initial version"; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } // Features feature ssh-client-keepalives { description "Per socket SSH keepalive parameters are configurable for SSH clients on the server implementing this feature."; } feature client-ident-publickey { description "Indicates that the 'publickey' authentication type, per RFC 4252, is supported for client identification. The 'publickey' authentication type is required by Watsen Expires 17 September 2024 [Page 32] Internet-Draft Groupings for SSH Clients and Servers March 2024 RFC 4252, but common implementations allow it to be disabled."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol"; } feature client-ident-password { description "Indicates that the 'password' authentication type, per RFC 4252, is supported for client identification."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol"; } feature client-ident-hostbased { description "Indicates that the 'hostbased' authentication type, per RFC 4252, is supported for client identification."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol"; } feature client-ident-none { description "Indicates that the 'none' authentication type, per RFC 4252, is supported for client identification. It is NOT RECOMMENDED to enable this feature."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol"; } // Groupings grouping ssh-client-grouping { description "A reusable grouping for configuring a SSH client without any consideration for how an underlying TCP session is established. Note that this grouping uses fairly typical descendant node names such that a nesting of 'uses' statements will have name conflicts. It is intended that the consuming data model will resolve the issue (e.g., by wrapping the 'uses' statement in a container called Watsen Expires 17 September 2024 [Page 33] Internet-Draft Groupings for SSH Clients and Servers March 2024 'ssh-client-parameters'). This model purposely does not do this itself so as to provide maximum flexibility to consuming models."; container client-identity { nacm:default-deny-write; description "The username and authentication methods for the client. The authentication methods are unordered. Clients may initially send any configured method or, per RFC 4252, Section 5.2, send the 'none' method to prompt the server to provide a list of productive methods. Whenever a choice amongst methods arises, implementations SHOULD use a default ordering that prioritizes automation over human-interaction."; leaf username { type string; description "The username of this user. This will be the username used, for instance, to log into an SSH server."; } container public-key { if-feature "client-ident-publickey"; presence "Indicates that publickey-based authentication has been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "A locally-defined or referenced asymmetric key pair to be used for client identification."; reference "RFC CCCC: A YANG Data Model for a Keystore"; uses ks:inline-or-keystore-asymmetric-key-grouping { refine "inline-or-keystore/inline/inline-definition" { must 'not(public-key-format) or derived-from-or-self' + '(public-key-format, "ct:ssh-public-key-format")'; } refine "inline-or-keystore/central-keystore/" + "central-keystore-reference" { must 'not(deref(.)/../ks:public-key-format) or derived-' + 'from-or-self(deref(.)/../ks:public-key-format, ' + '"ct:ssh-public-key-format")'; } } } container password { if-feature "client-ident-password"; Watsen Expires 17 September 2024 [Page 34] Internet-Draft Groupings for SSH Clients and Servers March 2024 presence "Indicates that password-based authentication has been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "A password to be used to authenticate the client's identity."; uses ct:password-grouping; } container hostbased { if-feature "client-ident-hostbased"; presence "Indicates that hostbased authentication is configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "A locally-defined or referenced asymmetric key pair to be used for host identification."; reference "RFC CCCC: A YANG Data Model for a Keystore"; uses ks:inline-or-keystore-asymmetric-key-grouping { refine "inline-or-keystore/inline/inline-definition" { must 'not(public-key-format) or derived-from-or-self(' + 'public-key-format, "ct:ssh-public-key-format")'; } refine "inline-or-keystore/central-keystore/" + "central-keystore-reference" { must 'not(deref(.)/../ks:public-key-format) or derived-' + 'from-or-self(deref(.)/../ks:public-key-format, ' + '"ct:ssh-public-key-format")'; } } } leaf none { if-feature "client-ident-none"; type empty; description "Indicates that 'none' algorithm is used for client identification."; } container certificate { if-feature "sshcmn:ssh-x509-certs"; presence "Indicates that certificate-based authentication has been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; Watsen Expires 17 September 2024 [Page 35] Internet-Draft Groupings for SSH Clients and Servers March 2024 description "A locally-defined or referenced certificate to be used for client identification."; reference "RFC CCCC: A YANG Data Model for a Keystore"; uses ks:inline-or-keystore-end-entity-cert-with-key-grouping { refine "inline-or-keystore/inline/inline-definition" { must 'not(public-key-format) or derived-from-or-self(' + 'public-key-format, "ct:subject-public-key-info-' + 'format")'; } refine "inline-or-keystore/central-keystore/" + "central-keystore-reference/asymmetric-key" { must 'not(deref(.)/../ks:public-key-format) or derived-' + 'from-or-self(deref(.)/../ks:public-key-format, ' + '"ct:subject-public-key-info-format")'; } } } } // container client-identity container server-authentication { nacm:default-deny-write; must 'ssh-host-keys or ca-certs or ee-certs'; description "Specifies how the SSH client can authenticate SSH servers. Any combination of authentication methods is additive and unordered."; container ssh-host-keys { presence "Indicates that the SSH host key have been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "A bag of SSH host keys used by the SSH client to authenticate SSH server host keys. A server host key is authenticated if it is an exact match to a configured SSH host key."; reference "RFC BBBB: A YANG Data Model for a Truststore"; uses ts:inline-or-truststore-public-keys-grouping { refine "inline-or-truststore/inline/inline-definition/public" + "-key" { must 'derived-from-or-self(public-key-format,' + ' "ct:ssh-public-key-format")'; } Watsen Expires 17 September 2024 [Page 36] Internet-Draft Groupings for SSH Clients and Servers March 2024 refine "inline-or-truststore/central-truststore/" + "central-truststore-reference" { must 'not(deref(.)/../ts:public-key/ts:public-key-' + 'format[not(derived-from-or-self(., "ct:ssh-' + 'public-key-format"))])'; } } } container ca-certs { if-feature "sshcmn:ssh-x509-certs"; presence "Indicates that the CA certificates have been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "A set of certificate authority (CA) certificates used by the SSH client to authenticate SSH servers. A server is authenticated if its certificate has a valid chain of trust to a configured CA certificate."; reference "RFC BBBB: A YANG Data Model for a Truststore"; uses ts:inline-or-truststore-certs-grouping; } container ee-certs { if-feature "sshcmn:ssh-x509-certs"; presence "Indicates that the EE certificates have been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "A set of end-entity certificates used by the SSH client to authenticate SSH servers. A server is authenticated if its certificate is an exact match to a configured end-entity certificate."; reference "RFC BBBB: A YANG Data Model for a Truststore"; uses ts:inline-or-truststore-certs-grouping; } } // container server-authentication container transport-params { nacm:default-deny-write; if-feature "sshcmn:transport-params"; description "Configurable parameters of the SSH transport layer."; uses sshcmn:transport-params-grouping; } // container transport-parameters Watsen Expires 17 September 2024 [Page 37] Internet-Draft Groupings for SSH Clients and Servers March 2024 container keepalives { nacm:default-deny-write; if-feature "ssh-client-keepalives"; presence "Indicates that the SSH client proactively tests the aliveness of the remote SSH server."; description "Configures the keep-alive policy, to proactively test the aliveness of the SSH server. An unresponsive SSH server is dropped after approximately max-wait * max-attempts seconds. Per Section 4 of RFC 4254, the SSH client SHOULD send an SSH_MSG_GLOBAL_REQUEST message with a purposely nonexistent 'request name' value (e.g., keepalive@ietf.org) and the 'want reply' value set to '1'."; reference "RFC 4254: The Secure Shell (SSH) Connection Protocol"; leaf max-wait { type uint16 { range "1..max"; } units "seconds"; default "30"; description "Sets the amount of time in seconds after which if no data has been received from the SSH server, a SSH-level message will be sent to test the aliveness of the SSH server."; } leaf max-attempts { type uint8; default "3"; description "Sets the maximum number of sequential keep-alive messages that can fail to obtain a response from the SSH server before assuming the SSH server is no longer alive."; } } // container keepalives } // grouping ssh-client-grouping } Watsen Expires 17 September 2024 [Page 38] Internet-Draft Groupings for SSH Clients and Servers March 2024 4. The "ietf-ssh-server" Module This section defines a YANG 1.1 module called "ietf-ssh-server". A high-level overview of the module is provided in Section 4.1. Examples illustrating the module's use are provided in Examples (Section 4.2). The YANG module itself is defined in Section 4.3. 4.1. Data Model Overview This section provides an overview of the "ietf-ssh-server" module in terms of its features and groupings. 4.1.1. Features The following diagram lists all the "feature" statements defined in the "ietf-ssh-server" module: Features: +-- ssh-server-keepalives +-- local-users-supported +-- local-user-auth-publickey {local-users-supported}? +-- local-user-auth-password {local-users-supported}? +-- local-user-auth-hostbased {local-users-supported}? +-- local-user-auth-none {local-users-supported}? The diagram above uses syntax that is similar to but not defined in [RFC8340]. Please refer to the YANG module for a description of each feature. 4.1.2. Groupings The "ietf-ssh-server" module defines the following "grouping" statement: * ssh-server-grouping This grouping is presented in the following subsection. 4.1.2.1. The "ssh-server-grouping" Grouping The following tree diagram [RFC8340] illustrates the "ssh-server- grouping" grouping: Watsen Expires 17 September 2024 [Page 39] Internet-Draft Groupings for SSH Clients and Servers March 2024 =============== NOTE: '\' line wrapping per RFC 8792 ================ grouping ssh-server-grouping: +-- server-identity | +-- host-key* [name] | +-- name? string | +-- (host-key-type) | +--:(public-key) | | +-- public-key | | +---u ks:inline-or-keystore-asymmetric-key-groupi\ ng | +--:(certificate) | +-- certificate {sshcmn:ssh-x509-certs}? | +---u ks:inline-or-keystore-end-entity-cert-with-\ key-grouping +-- client-authentication | +-- users {local-users-supported}? | | +-- user* [name] | | +-- name? string | | +-- public-keys! {local-user-auth-publickey}? | | | +---u ts:inline-or-truststore-public-keys-grouping | | +-- password | | | +-- hashed-password? ianach:crypt-hash | | | | {local-user-auth-password}? | | | +--ro last-modified? yang:date-and-time | | +-- hostbased! {local-user-auth-hostbased}? | | | +---u ts:inline-or-truststore-public-keys-grouping | | +-- none? empty {local-user-auth-none}? | +-- ca-certs! {sshcmn:ssh-x509-certs}? | | +---u ts:inline-or-truststore-certs-grouping | +-- ee-certs! {sshcmn:ssh-x509-certs}? | +---u ts:inline-or-truststore-certs-grouping +-- transport-params {sshcmn:transport-params}? | +---u sshcmn:transport-params-grouping +-- keepalives! {ssh-server-keepalives}? +-- max-wait? uint16 +-- max-attempts? uint8 Comments: * The "server-identity" node configures the authentication methods the server can use to identify itself to clients. The ability to use a certificate is enabled by a "feature". * The "client-authentication" node configures trust anchors for authenticating the SSH client, with each option enabled by a "feature" statement. Watsen Expires 17 September 2024 [Page 40] Internet-Draft Groupings for SSH Clients and Servers March 2024 * The "transport-params" node, which must be enabled by a feature, configures parameters for the SSH sessions established by this configuration. * The "keepalives" node, which must be enabled by a feature, configures a "presence" container for testing the aliveness of the SSH client. The aliveness-test occurs at the SSH protocol layer. * For the referenced grouping statement(s): - The "inline-or-keystore-asymmetric-key-grouping" grouping is discussed in Section 2.1.3.4 of [I-D.ietf-netconf-keystore]. - The "inline-or-keystore-end-entity-cert-with-key-grouping" grouping is discussed in Section 2.1.3.6 of [I-D.ietf-netconf-keystore]. - The "inline-or-truststore-public-keys-grouping" grouping is discussed in Section 2.1.3.4 of [I-D.ietf-netconf-trust-anchors]. - The "inline-or-truststore-certs-grouping" grouping is discussed in Section 2.1.3.3 of [I-D.ietf-netconf-trust-anchors]. - The "transport-params-grouping" grouping is discussed in Section 2.1.2.1 in this document. 4.1.3. Protocol-accessible Nodes The "ietf-ssh-server" module defines only "grouping" statements that are used by other modules to instantiate protocol-accessible nodes. Thus this module, when implemented, does not itself define any protocol-accessible nodes. 4.2. Example Usage This section presents two examples showing the "ssh-server-grouping" grouping populated with some data. These examples are effectively the same except the first configures the server identity using a inlined key while the second uses a key configured in a keystore. Both examples are consistent with the examples presented in Section 2.2.1 of [I-D.ietf-netconf-trust-anchors] and Section 2.2.1 of [I-D.ietf-netconf-keystore]. The following configuration example uses inline-definitions for the server identity and client authentication: Watsen Expires 17 September 2024 [Page 41] Internet-Draft Groupings for SSH Clients and Servers March 2024 =============== NOTE: '\' line wrapping per RFC 8792 ================ my-pubkey-based-host-key ct:rsa-private-key-format BASE64VALUE= my-cert-based-host-key ct:rsa-private-key-format BASE64VALUE= BASE64VALUE= mary $0$example-secret Mary-Key-1 ct:ssh-public-key-format Watsen Expires 17 September 2024 [Page 42] Internet-Draft Groupings for SSH Clients and Servers March 2024 BASE64VALUE= Mary-Key-2 ct:ssh-public-key-format BASE64VALUE= Identity Cert Issuer #1 BASE64VALUE= Identity Cert Issuer #2 BASE64VALUE= Application #1 BASE64VALUE= Application #2 BASE64VALUE= 30 3 The following configuration example uses central-keystore-references for the server identity and central-truststore-references for client authentication: from the keystore: Watsen Expires 17 September 2024 [Page 43] Internet-Draft Groupings for SSH Clients and Servers March 2024 =============== NOTE: '\' line wrapping per RFC 8792 ================ my-pubkey-based-host-key ssh-rsa-key my-cert-based-host-key ssh-rsa-key-with-cert ex-rsa-cert2 mary $0$example-secret SSH Public Keys for Applicat\ ion A trusted-client-ca-certs trusted-client-ee-certs 30 3 4.3. YANG Module This YANG module has references to [RFC4251], [RFC4252], [RFC4253], [RFC4254], [RFC7317], [RFC8341], [I-D.ietf-netconf-crypto-types], [I-D.ietf-netconf-trust-anchors], and [I-D.ietf-netconf-keystore]. file "ietf-ssh-server@2024-03-16.yang" module ietf-ssh-server { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-ssh-server"; prefix sshs; import ietf-yang-types { prefix yang; reference "RFC 6991: Common YANG Data Types"; } import iana-crypt-hash { prefix ianach; reference "RFC 7317: A YANG Data Model for System Management"; } import ietf-netconf-acm { prefix nacm; reference "RFC 8341: Network Configuration Access Control Model"; } import ietf-crypto-types { prefix ct; reference "RFC AAAA: YANG Data Types and Groupings for Cryptography"; } Watsen Expires 17 September 2024 [Page 45] Internet-Draft Groupings for SSH Clients and Servers March 2024 import ietf-truststore { prefix ts; reference "RFC BBBB: A YANG Data Model for a Truststore"; } import ietf-keystore { prefix ks; reference "RFC CCCC: A YANG Data Model for a Keystore"; } import ietf-ssh-common { prefix sshcmn; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: https://datatracker.ietf.org/wg/netconf WG List: NETCONF WG list Author: Kent Watsen "; description "This module defines a reusable grouping for SSH servers that can be used as a basis for specific SSH server instances. Copyright (c) 2024 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC EEEE (https://www.rfc-editor.org/info/rfcEEEE); see the RFC itself for full legal notices. 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 (RFC 2119) Watsen Expires 17 September 2024 [Page 46] Internet-Draft Groupings for SSH Clients and Servers March 2024 (RFC 8174) when, and only when, they appear in all capitals, as shown here."; revision 2024-03-16 { description "Initial version"; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } // Features feature ssh-server-keepalives { description "Per socket SSH keepalive parameters are configurable for SSH servers on the server implementing this feature."; } feature local-users-supported { description "Indicates that the configuration for users can be configured herein, as opposed to in an application specific location."; } feature local-user-auth-publickey { if-feature "local-users-supported"; description "Indicates that the 'publickey' authentication type, per RFC 4252, is supported for locally-defined users. The 'publickey' authentication type is required by RFC 4252, but common implementations allow it to be disabled."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol"; } feature local-user-auth-password { if-feature "local-users-supported"; description "Indicates that the 'password' authentication type, per RFC 4252, is supported for locally-defined users."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol"; } Watsen Expires 17 September 2024 [Page 47] Internet-Draft Groupings for SSH Clients and Servers March 2024 feature local-user-auth-hostbased { if-feature "local-users-supported"; description "Indicates that the 'hostbased' authentication type, per RFC 4252, is supported for locally-defined users."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol"; } feature local-user-auth-none { if-feature "local-users-supported"; description "Indicates that the 'none' authentication type, per RFC 4252, is supported. It is NOT RECOMMENDED to enable this feature."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol"; } // Groupings grouping ssh-server-grouping { description "A reusable grouping for configuring a SSH server without any consideration for how underlying TCP sessions are established. Note that this grouping uses fairly typical descendant node names such that a nesting of 'uses' statements will have name conflicts. It is intended that the consuming data model will resolve the issue (e.g., by wrapping the 'uses' statement in a container called 'ssh-server-parameters'). This model purposely does not do this itself so as to provide maximum flexibility to consuming models."; container server-identity { nacm:default-deny-write; description "The list of host keys the SSH server will present when establishing a SSH connection."; list host-key { key "name"; min-elements 1; ordered-by user; description Watsen Expires 17 September 2024 [Page 48] Internet-Draft Groupings for SSH Clients and Servers March 2024 "An ordered list of host keys (see RFC 4251) the SSH server will use to construct its ordered list of algorithms, when sending its SSH_MSG_KEXINIT message, as defined in Section 7.1 of RFC 4253."; reference "RFC 4251: The Secure Shell (SSH) Protocol Architecture RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; leaf name { type string; description "An arbitrary name for this host key"; } choice host-key-type { mandatory true; description "The type of host key being specified"; container public-key { description "A locally-defined or referenced asymmetric key pair to be used for the SSH server's host key."; reference "RFC CCCC: A YANG Data Model for a Keystore"; uses ks:inline-or-keystore-asymmetric-key-grouping { refine "inline-or-keystore/inline/inline-definition" { must 'not(public-key-format) or derived-from-or-self' + '(public-key-format, "ct:ssh-public-key-format")'; } refine "inline-or-keystore/central-keystore/" + "central-keystore-reference" { must 'not(deref(.)/../ks:public-key-format) or ' + 'derived-from-or-self(deref(.)/../ks:public-' + 'key-format, "ct:ssh-public-key-format")'; } } } container certificate { if-feature "sshcmn:ssh-x509-certs"; description "A locally-defined or referenced end-entity certificate to be used for the SSH server's host key."; reference "RFC CCCC: A YANG Data Model for a Keystore"; uses ks:inline-or-keystore-end-entity-cert-with-key-grouping{ refine "inline-or-keystore/inline/inline-definition" { Watsen Expires 17 September 2024 [Page 49] Internet-Draft Groupings for SSH Clients and Servers March 2024 must 'not(public-key-format) or derived-from-or-self' + '(public-key-format, "ct:subject-public-key-' + 'info-format")'; } refine "inline-or-keystore/central-keystore/" + "central-keystore-reference/asymmetric-key" { must 'not(deref(.)/../ks:public-key-format) or ' + 'derived-from-or-self(deref(.)/../ks:public-key' + '-format, "ct:subject-public-key-info-format")'; } } } } } } // container server-identity container client-authentication { nacm:default-deny-write; description "Specifies how the SSH server can be configured to authenticate SSH clients. See RFC 4252 for a general discussion about SSH authentication."; reference "RFC 4252: The Secure Shell (SSH) Transport Layer"; container users { if-feature "local-users-supported"; description "A list of locally configured users."; list user { key "name"; description "A locally configured user. The server SHOULD derive the list of authentication 'method names' returned to the SSH client from the descendant nodes configured herein, per Sections 5.1 and 5.2 in RFC 4252. The authentication methods are unordered. Clients must authenticate to all configured methods. Whenever a choice amongst methods arises, implementations SHOULD use a default ordering that prioritizes automation over human-interaction."; leaf name { type string; description "The 'user name' for the SSH client, as defined in the SSH_MSG_USERAUTH_REQUEST message in RFC 4253."; Watsen Expires 17 September 2024 [Page 50] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } container public-keys { if-feature "local-user-auth-publickey"; presence "Indicates that public keys have been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "A set of SSH public keys may be used by the SSH server to authenticate this user. A user is authenticated if its public key is an exact match to a configured public key."; reference "RFC BBBB: A YANG Data Model for a Truststore"; uses ts:inline-or-truststore-public-keys-grouping { refine "inline-or-truststore/inline/inline-definition/" + "public-key" { must 'derived-from-or-self(public-key-format,' + ' "ct:ssh-public-key-format")'; } refine "inline-or-truststore/central-truststore/" + "central-truststore-reference" { must 'not(deref(.)/../ts:public-key/ts:public-key-' + 'format[not(derived-from-or-self(., "ct:ssh-' + 'public-key-format"))])'; } } } container password { description "A password the SSH server may use to authenticate this user. A user is authenticated if the hash of the supplied password matches this value."; leaf hashed-password { if-feature "local-user-auth-password"; type ianach:crypt-hash; description "The password for this user."; } leaf last-modified { type yang:date-and-time; config false; description "Identifies when the password was last set."; Watsen Expires 17 September 2024 [Page 51] Internet-Draft Groupings for SSH Clients and Servers March 2024 } } container hostbased { if-feature "local-user-auth-hostbased"; presence "Indicates that hostbased [RFC4252] keys have been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "A set of SSH host keys used by the SSH server to authenticate this user's host. A user's host is authenticated if its host key is an exact match to a configured host key."; reference "RFC 4252: The Secure Shell (SSH) Transport Layer RFC BBBB: A YANG Data Model for a Truststore"; uses ts:inline-or-truststore-public-keys-grouping { refine "inline-or-truststore/inline/inline-definition/" + "public-key" { must 'derived-from-or-self(public-key-format,' + ' "ct:ssh-public-key-format")'; } refine "inline-or-truststore/central-truststore/" + "central-truststore-reference" { must 'not(deref(.)/../ts:public-key/ts:public-key-' + 'format[not(derived-from-or-self(., "ct:ssh-' + 'public-key-format"))])'; } } } leaf none { if-feature "local-user-auth-none"; type empty; description "Indicates that the 'none' method is configured for this user."; reference "RFC 4252: The Secure Shell (SSH) Authentication Protocol."; } } } // users container ca-certs { if-feature "sshcmn:ssh-x509-certs"; presence "Indicates that CA certificates have been configured. This statement is present so the mandatory descendant Watsen Expires 17 September 2024 [Page 52] Internet-Draft Groupings for SSH Clients and Servers March 2024 nodes do not imply this node must be configured."; description "A set of certificate authority (CA) certificates used by the SSH server to authenticate SSH client certificates. A client certificate is authenticated if it has a valid chain of trust to a configured CA certificate."; reference "RFC BBBB: A YANG Data Model for a Truststore"; uses ts:inline-or-truststore-certs-grouping; } container ee-certs { if-feature "sshcmn:ssh-x509-certs"; presence "Indicates that EE certificates have been configured. This statement is present so the mandatory descendant nodes do not imply this node must be configured."; description "A set of client certificates (i.e., end entity certificates) used by the SSH server to authenticate the certificates presented by SSH clients. A client certificate is authenticated if it is an exact match to a configured end-entity certificate."; reference "RFC BBBB: A YANG Data Model for a Truststore"; uses ts:inline-or-truststore-certs-grouping; } } // container client-authentication container transport-params { nacm:default-deny-write; if-feature "sshcmn:transport-params"; description "Configurable parameters of the SSH transport layer."; uses sshcmn:transport-params-grouping; } // container transport-params container keepalives { nacm:default-deny-write; if-feature "ssh-server-keepalives"; presence "Indicates that the SSH server proactively tests the aliveness of the remote SSH client."; description "Configures the keep-alive policy, to proactively test the aliveness of the SSH client. An unresponsive SSH client is dropped after approximately max-wait * max-attempts seconds. Per Section 4 of RFC 4254, the SSH server SHOULD send an SSH_MSG_GLOBAL_REQUEST Watsen Expires 17 September 2024 [Page 53] Internet-Draft Groupings for SSH Clients and Servers March 2024 message with a purposely nonexistent 'request name' value (e.g., keepalive@ietf.org) and the 'want reply' value set to '1'."; reference "RFC 4254: The Secure Shell (SSH) Connection Protocol"; leaf max-wait { type uint16 { range "1..max"; } units "seconds"; default "30"; description "Sets the amount of time in seconds after which if no data has been received from the SSH client, a SSH-level message will be sent to test the aliveness of the SSH client."; } leaf max-attempts { type uint8; default "3"; description "Sets the maximum number of sequential keep-alive messages that can fail to obtain a response from the SSH client before assuming the SSH client is no longer alive."; } } } // grouping ssh-server-grouping } 5. Security Considerations The three IETF YANG modules in this document define groupings and will not be deployed as standalone modules. Their security implications may be context dependent based on their use in other modules. The designers of modules which import these grouping must conduct their own analysis of the security considerations. 5.1. Considerations for the "iana-ssh-key-exchange-algs" Module This section follows the template defined in Section 3.7.1 of [RFC8407]. Watsen Expires 17 September 2024 [Page 54] Internet-Draft Groupings for SSH Clients and Servers March 2024 The "iana-ssh-key-exchange-algs" YANG module defines a data model that is designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication. The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content. This YANG module defines YANG enumerations, for a public IANA- maintained registry. YANG enumerations are not security-sensitive, as they are statically defined in the publicly-accessible YANG module. IANA MAY deprecate and/or obsolete enumerations over time as needed to address security issues found in the algorithms. This module does not define any writable-nodes, RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 5.2. Considerations for the "iana-ssh-encryption-algs" Module This section follows the template defined in Section 3.7.1 of [RFC8407]. The "iana-ssh-encryption-algs" YANG module defines a data model that is designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication. The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content. This YANG module defines YANG enumerations, for a public IANA- maintained registry. YANG enumerations are not security-sensitive, as they are statically defined in the publicly-accessible YANG module. This module does not define any writable-nodes, RPCs, actions, or notifications, and thus the security consideration for such is not provided here. Watsen Expires 17 September 2024 [Page 55] Internet-Draft Groupings for SSH Clients and Servers March 2024 5.3. Considerations for the "iana-ssh-mac-algs" Module This section follows the template defined in Section 3.7.1 of [RFC8407]. The "iana-ssh-mac-algs" YANG module defines a data model that is designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication. The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content. This YANG module defines YANG enumerations, for a public IANA- maintained registry. YANG enumerations are not security-sensitive, as they are statically defined in the publicly-accessible YANG module. This module does not define any writable-nodes, RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 5.4. Considerations for the "iana-ssh-public-key-algs" Module This section follows the template defined in Section 3.7.1 of [RFC8407]. The "iana-ssh-public-key-algs" YANG module defines a data model that is designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication. The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content. This YANG module defines YANG enumerations, for a public IANA- maintained registry. YANG enumerations are not security-sensitive, as they are statically defined in the publicly-accessible YANG module. Watsen Expires 17 September 2024 [Page 56] Internet-Draft Groupings for SSH Clients and Servers March 2024 This module does not define any writable-nodes, RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 5.5. Considerations for the "ietf-ssh-common" YANG Module This section follows the template defined in Section 3.7.1 of [RFC8407]. The "ietf-ssh-common" YANG module defines "grouping" statements that are designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication. The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content. Please be aware that this YANG module uses groupings from other YANG modules that define nodes that may be considered sensitive or vulnerable in network environments. Please review the Security Considerations for dependent YANG modules for information as to which nodes may be considered sensitive or vulnerable in network environments. None of the readable data nodes defined in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-all" extension has not been set for any data nodes defined in this module. None of the writable data nodes defined in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-write" extension has not been set for any data nodes defined in this module. This module defines the RPC "generate-asymmetric-key-pair" that may, if the "ct:cleartext-private-keys" feature is enabled, and the client requests it, return the private clear in cleartext form. It is NOT RECOMMENDED for private keys to pass the server's security perimeter. This module does not define any actions or notifications, and thus the security consideration for such is not provided here. 5.6. Considerations for the "ietf-ssh-client" YANG Module This section follows the template defined in Section 3.7.1 of [RFC8407]. Watsen Expires 17 September 2024 [Page 57] Internet-Draft Groupings for SSH Clients and Servers March 2024 The "ietf-ssh-client" YANG module defines "grouping" statements that are designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication. The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content. Please be aware that this YANG module uses groupings from other YANG modules that define nodes that may be considered sensitive or vulnerable in network environments. Please review the Security Considerations for dependent YANG modules for information as to which nodes may be considered sensitive or vulnerable in network environments. One readable data node defined in this YANG module may be considered sensitive or vulnerable in some network environments. This node is as follows: * The "client-identity/password" node: The cleartext "password" node defined in the "ssh-client- grouping" grouping is additionally sensitive to read operations such that, in normal use cases, it should never be returned to a client. For this reason, the NACM extension "default-deny- all" has been applied to it. All the writable data nodes defined by this module may be considered sensitive or vulnerable in some network environments. For instance, any modification to a key or reference to a key may dramatically alter the implemented security policy. For this reason, the NACM extension "default-deny-write" has been set for all data nodes defined in this module. This module does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 5.7. Considerations for the "ietf-ssh-server" YANG Module This section follows the template defined in Section 3.7.1 of [RFC8407]. Watsen Expires 17 September 2024 [Page 58] Internet-Draft Groupings for SSH Clients and Servers March 2024 The "ietf-ssh-server" YANG module defines "grouping" statements that are designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication. The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content. Please be aware that this YANG module uses groupings from other YANG modules that define nodes that may be considered sensitive or vulnerable in network environments. Please review the Security Considerations for dependent YANG modules for information as to which nodes may be considered sensitive or vulnerable in network environments. None of the readable data nodes defined in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-all" extension has not been set for any data nodes defined in this module. All the writable data nodes defined by this module may be considered sensitive or vulnerable in some network environments. For instance, the addition or removal of references to keys, certificates, trusted anchors, etc., or even the modification of transport or keepalive parameters can dramatically alter the implemented security policy. For this reason, the NACM extension "default-deny-write" has been set for all data nodes defined in this module. This module does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 6. IANA Considerations 6.1. The "IETF XML" Registry This document registers seven URIs in the "ns" subregistry of the IETF XML Registry [RFC3688]. Following the format in [RFC3688], the following registrations are requested: Watsen Expires 17 September 2024 [Page 59] Internet-Draft Groupings for SSH Clients and Servers March 2024 URI: urn:ietf:params:xml:ns:yang:iana-ssh-key-exchange-algs Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:iana-ssh-encryption-algs Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:iana-ssh-mac-algs Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:iana-ssh-public-key-algs Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-ssh-common Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-ssh-client Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-ssh-server Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. 6.2. The "YANG Module Names" Registry This document registers seven YANG modules in the YANG Module Names registry [RFC6020]. Following the format in [RFC6020], the following registrations are requested: Watsen Expires 17 September 2024 [Page 60] Internet-Draft Groupings for SSH Clients and Servers March 2024 name: iana-ssh-key-exchange-algs namespace: urn:ietf:params:xml:ns:yang:iana-ssh-key-exchange-algs prefix: sshkea reference: RFC EEEE name: iana-ssh-encryption-algs namespace: urn:ietf:params:xml:ns:yang:iana-ssh-encryption-algs prefix: sshea reference: RFC EEEE name: iana-ssh-mac-algs namespace: urn:ietf:params:xml:ns:yang:iana-ssh-mac-algs prefix: sshma reference: RFC EEEE name: iana-ssh-public-key-algs namespace: urn:ietf:params:xml:ns:yang:iana-ssh-public-key-algs prefix: sshpka reference: RFC EEEE name: ietf-ssh-common namespace: urn:ietf:params:xml:ns:yang:ietf-ssh-common prefix: sshcmn reference: RFC EEEE name: ietf-ssh-client namespace: urn:ietf:params:xml:ns:yang:ietf-ssh-client prefix: sshc reference: RFC EEEE name: ietf-ssh-server namespace: urn:ietf:params:xml:ns:yang:ietf-ssh-server prefix: sshs reference: RFC EEEE 6.3. Considerations for the "iana-ssh-encryption-algs" Module This section follows the template defined in Section 4.30.3.1 of [I-D.ietf-netmod-rfc8407bis]. This document presents a script (see Appendix A) for IANA to use to generate the IANA-maintained "iana-ssh-encryption-algs" YANG module. The most recent version of the YANG module is available from the "YANG Parameters" registry [IANA-YANG-PARAMETERS]. IANA is requested to add the following note to the registry: Watsen Expires 17 September 2024 [Page 61] Internet-Draft Groupings for SSH Clients and Servers March 2024 | New values must not be directly added to the "iana-ssh-encryption- | algs" YANG module. They must instead be added to the "Encryption | Algorithm Names" sub-registry of the "Secure Shell (SSH) Protocol | Parameters" registry [IANA-ENC-ALGS]. When a value is added to the "Encryption Algorithm Names" sub- registry, a new "enum" statement must be added to the "iana-ssh- encryption-algs" YANG module. The "enum" statement, and sub- statements thereof, should be defined as follows: enum Replicates a name from the registry. value Contains the decimal value of the IANA-assigned value. status Include only if a registration has been deprecated or obsoleted. An IANA "Note" containing the word "HISTORIC" maps to YANG status "obsolete". Since the registry is unable to express a "SHOULD NOT" recommendation, there is no mapping to YANG status "deprecated". description Contains "Enumeration for the 'foo-bar' algorithm.", where "foo- bar" is a placeholder for the algorithm's name (e.g., "3des-cbc"). reference Replicates the reference(s) from the registry with the title of the document(s) added. Unassigned or reserved values are not present in the module. When the "iana-ssh-encryption-algs" YANG module is updated, a new "revision" statement with a unique revision date must be added in front of the existing revision statements. The "revision" must have a "description" statement explaining why the the update occurred, and must have a "reference" substatement that points to the document defining the registry update that resulted in this change. For instance: Watsen Expires 17 September 2024 [Page 62] Internet-Draft Groupings for SSH Clients and Servers March 2024 revision 2024-02-02 { description "This update reflect the update made to the underlying Foo Bar registry per RFC XXXX."; reference "RFC XXXX: Extend the Foo Bars Registry to Support Something Important"; } IANA is requested to add the following note to the "Encryption Algorithm Names" sub-registry. | When this registry is modified, the YANG module "iana-ssh- | encryption-algs" [IANA-YANG-PARAMETERS] must be updated as defined | in RFC EEEE. 6.4. Considerations for the "iana-ssh-mac-algs" Module This section follows the template defined in Section 4.30.3.1 of [I-D.ietf-netmod-rfc8407bis]. This document presents a script (see Appendix A) for IANA to use to generate the IANA-maintained "iana-ssh-mac-algs" YANG module. The most recent version of the YANG module is available from the "YANG Parameters" registry [IANA-YANG-PARAMETERS]. IANA is requested to add the following note to the registry: | New values must not be directly added to the "iana-ssh-mac-algs" | YANG module. They must instead be added to the "MAC Algorithm | Names" sub-registry of the "Secure Shell (SSH) Protocol | Parameters" registry [IANA-MAC-ALGS]. When a value is added to the "MAC Algorithm Names" sub-registry, a new "enum" statement must be added to the "iana-ssh-mac-algs" YANG module. The "enum" statement, and sub-statements thereof, should be defined as follows: enum Replicates a name from the registry. value Contains the decimal value of the IANA-assigned value. status Include only if a registration has been deprecated or obsoleted. Watsen Expires 17 September 2024 [Page 63] Internet-Draft Groupings for SSH Clients and Servers March 2024 description Contains "Enumeration for the 'foo-bar' algorithm.", where "foo- bar" is a placeholder for the algorithm's name (e.g., "3des-cbc"). reference Replicates the reference(s) from the registry with the title of the document(s) added. Unassigned or reserved values are not present in the module. When the "iana-ssh-mac-algs" YANG module is updated, a new "revision" statement with a unique revision date must be added in front of the existing revision statements. The "revision" must have a "description" statement explaining why the the update occurred, and must have a "reference" substatement that points to the document defining the registry update that resulted in this change. For instance: revision 2024-02-02 { description "This update reflect the update made to the underlying Foo Bar registry per RFC XXXX."; reference "RFC XXXX: Extend the Foo Bars Registry to Support Something Important"; } IANA is requested to add the following note to the "MAC Algorithm Names" sub-registry. | When this registry is modified, the YANG module "iana-ssh-mac- | algs" [IANA-YANG-PARAMETERS] must be updated as defined in RFC | EEEE. 6.5. Considerations for the "iana-ssh-public-key-algs" Module This section follows the template defined in Section 4.30.3.1 of [I-D.ietf-netmod-rfc8407bis]. This document presents a script (see Appendix A) for IANA to use to generate the IANA-maintained "iana-ssh-public-key-algs" YANG module. The most recent version of the YANG module is available from the "YANG Parameters" registry [IANA-YANG-PARAMETERS]. IANA is requested to add the following note to the registry: Watsen Expires 17 September 2024 [Page 64] Internet-Draft Groupings for SSH Clients and Servers March 2024 | New values must not be directly added to the "iana-ssh-public-key- | algs" YANG module. They must instead be added to the "Public Key | Algorithm Names" sub-registry of the "Secure Shell (SSH) Protocol | Parameters" registry [IANA-PUBKEY-ALGS]. When a value is added to the "Public Key Algorithm Names" sub- registry, a new "enum" statement must be added to the "iana-ssh- public-key-algs" YANG module. The "enum" statement, and sub- statements thereof, should be defined as follows: enum Replicates a name from the registry. value Contains the decimal value of the IANA-assigned value. status Include only if a registration has been deprecated or obsoleted. description Contains "Enumeration for the 'foo-bar' algorithm.", where "foo- bar" is a placeholder for the algorithm's name (e.g., "3des-cbc"). reference Replicates the reference(s) from the registry with the title of the document(s) added. In the case that the algorithm name ends with "-*", the familiy of enumerations must be added. The familiy of enum algorithm names are generated by replacing the '*' character with these strings: "nistp256", "nistp384", "nistp521", "1.3.132.0.1", "1.2.840.10045.3.1.1", "1.3.132.0.33", "1.3.132.0.26", "1.3.132.0.27", "1.3.132.0.16", "1.3.132.0.36", "1.3.132.0.37", and "1.3.132.0.38". Unassigned or reserved values are not present in the module. When the "iana-ssh-public-key-algs" YANG module is updated, a new "revision" statement with a unique revision date must be added in front of the existing revision statements. The "revision" must have a "description" statement explaining why the the update occurred, and must have a "reference" substatement that points to the document defining the registry update that resulted in this change. For instance: Watsen Expires 17 September 2024 [Page 65] Internet-Draft Groupings for SSH Clients and Servers March 2024 revision 2024-02-02 { description "This update reflect the update made to the underlying Foo Bar registry per RFC XXXX."; reference "RFC XXXX: Extend the Foo Bars Registry to Support Something Important"; } IANA is requested to add the following note to the "Public Key Algorithm Names" sub-registry. | When this registry is modified, the YANG module "iana-ssh-public- | key-algs" [IANA-YANG-PARAMETERS] must be updated as defined in RFC | EEEE. 6.6. Considerations for the "iana-ssh-key-exchange-algs" Module This section follows the template defined in Section 4.30.3.1 of [I-D.ietf-netmod-rfc8407bis]. This document presents a script (see Appendix A) for IANA to use to generate the IANA-maintained "iana-ssh-key-exchange-algs" YANG module. The most recent version of the YANG module is available from the "YANG Parameters" registry [IANA-YANG-PARAMETERS]. IANA is requested to add the following note to the registry: | New values must not be directly added to the "iana-ssh-key- | exchange-algs" YANG module. They must instead be added to the | "Key Exchange Method Names" sub-registry of the "Secure Shell | (SSH) Protocol Parameters" registry [IANA-KEYEX-ALGS]. When a value is added to the "Key Exchange Method Names" sub- registry, a new "enum" statement must be added to the "iana-ssh-key- exchange-algs" YANG module. The "enum" statement, and sub-statements thereof, should be defined as follows: enum Replicates a name from the registry. value Contains the decimal value of the IANA-assigned value. Watsen Expires 17 September 2024 [Page 66] Internet-Draft Groupings for SSH Clients and Servers March 2024 status Include only if a registration has been deprecated or obsoleted. An IANA "OK to Implement" containing "SHOULD NOT" maps to YANG status "deprecated". An IANA "OK to Implement" containing "MUST NOT" maps to YANG status "obsolete". description Contains "Enumeration for the 'foo-bar' algorithm.", where "foo- bar" is a placeholder for the algorithm's name (e.g., "3des-cbc"). reference Replicates the reference(s) from the registry with the title of the document(s) added. In the case that the algorithm name ends with "-*", the familiy of enumerations must be added. The familiy of enum algorithm names are generated by replacing the '*' character with these strings: "nistp256", "nistp384", "nistp521", "1.3.132.0.1", "1.2.840.10045.3.1.1", "1.3.132.0.33", "1.3.132.0.26", "1.3.132.0.27", "1.3.132.0.16", "1.3.132.0.36", "1.3.132.0.37", and "1.3.132.0.38". Unassigned or reserved values are not present in the module. When the "iana-ssh-key-exchange-algs" YANG module is updated, a new "revision" statement with a unique revision date must be added in front of the existing revision statements. The "revision" must have a "description" statement explaining why the the update occurred, and must have a "reference" substatement that points to the document defining the registry update that resulted in this change. For instance: revision 2024-02-02 { description "This update reflect the update made to the underlying Foo Bar registry per RFC XXXX."; reference "RFC XXXX: Extend the Foo Bars Registry to Support Something Important"; } IANA is requested to add the following note to the "Key Exchange Method Names" sub-registry. | When this registry is modified, the YANG module "iana-ssh-key- | exchange-algs" [IANA-YANG-PARAMETERS] must be updated as defined | in RFC EEEE. Watsen Expires 17 September 2024 [Page 67] Internet-Draft Groupings for SSH Clients and Servers March 2024 7. References 7.1. Normative References [I-D.ietf-netconf-crypto-types] Watsen, K., "YANG Data Types and Groupings for Cryptography", Work in Progress, Internet-Draft, draft- ietf-netconf-crypto-types-33, 1 March 2024, . [I-D.ietf-netconf-keystore] Watsen, K., "A YANG Data Model for a Keystore and Keystore Operations", Work in Progress, Internet-Draft, draft-ietf- netconf-keystore-34, 1 March 2024, . [I-D.ietf-netconf-trust-anchors] Watsen, K., "A YANG Data Model for a Truststore", Work in Progress, Internet-Draft, draft-ietf-netconf-trust- anchors-27, 1 March 2024, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC4251] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH) Protocol Architecture", RFC 4251, DOI 10.17487/RFC4251, January 2006, . [RFC4252] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH) Authentication Protocol", RFC 4252, DOI 10.17487/RFC4252, January 2006, . [RFC4253] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH) Transport Layer Protocol", RFC 4253, DOI 10.17487/RFC4253, January 2006, . [RFC4254] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH) Connection Protocol", RFC 4254, DOI 10.17487/RFC4254, January 2006, . Watsen Expires 17 September 2024 [Page 68] Internet-Draft Groupings for SSH Clients and Servers March 2024 [RFC4344] Bellare, M., Kohno, T., and C. Namprempre, "The Secure Shell (SSH) Transport Layer Encryption Modes", RFC 4344, DOI 10.17487/RFC4344, January 2006, . [RFC4419] Friedl, M., Provos, N., and W. Simpson, "Diffie-Hellman Group Exchange for the Secure Shell (SSH) Transport Layer Protocol", RFC 4419, DOI 10.17487/RFC4419, March 2006, . [RFC4432] Harris, B., "RSA Key Exchange for the Secure Shell (SSH) Transport Layer Protocol", RFC 4432, DOI 10.17487/RFC4432, March 2006, . [RFC4462] Hutzelman, J., Salowey, J., Galbraith, J., and V. Welch, "Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol", RFC 4462, DOI 10.17487/RFC4462, May 2006, . [RFC5647] Igoe, K. and J. Solinas, "AES Galois Counter Mode for the Secure Shell Transport Layer Protocol", RFC 5647, DOI 10.17487/RFC5647, August 2009, . [RFC5656] Stebila, D. and J. Green, "Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer", RFC 5656, DOI 10.17487/RFC5656, December 2009, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [RFC6187] Igoe, K. and D. Stebila, "X.509v3 Certificates for Secure Shell Authentication", RFC 6187, DOI 10.17487/RFC6187, March 2011, . [RFC6668] Bider, D. and M. Baushke, "SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport Layer Protocol", RFC 6668, DOI 10.17487/RFC6668, July 2012, . [RFC7317] Bierman, A. and M. Bjorklund, "A YANG Data Model for System Management", RFC 7317, DOI 10.17487/RFC7317, August 2014, . Watsen Expires 17 September 2024 [Page 69] Internet-Draft Groupings for SSH Clients and Servers March 2024 [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8268] Baushke, M., "More Modular Exponentiation (MODP) Diffie- Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)", RFC 8268, DOI 10.17487/RFC8268, December 2017, . [RFC8308] Bider, D., "Extension Negotiation in the Secure Shell (SSH) Protocol", RFC 8308, DOI 10.17487/RFC8308, March 2018, . [RFC8332] Bider, D., "Use of RSA Keys with SHA-256 and SHA-512 in the Secure Shell (SSH) Protocol", RFC 8332, DOI 10.17487/RFC8332, March 2018, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . [RFC8709] Harris, B. and L. Velvindron, "Ed25519 and Ed448 Public Key Algorithms for the Secure Shell (SSH) Protocol", RFC 8709, DOI 10.17487/RFC8709, February 2020, . [RFC8731] Adamantiadis, A., Josefsson, S., and M. Baushke, "Secure Shell (SSH) Key Exchange Method Using Curve25519 and Curve448", RFC 8731, DOI 10.17487/RFC8731, February 2020, . [RFC8732] Sorce, S. and H. Kario, "Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2", RFC 8732, DOI 10.17487/RFC8732, February 2020, . [RFC8758] Velvindron, L., "Deprecating RC4 in Secure Shell (SSH)", BCP 227, RFC 8758, DOI 10.17487/RFC8758, April 2020, . 7.2. Informative References Watsen Expires 17 September 2024 [Page 70] Internet-Draft Groupings for SSH Clients and Servers March 2024 [FIPS_186-6] (NIST), T. N. I. F. S. A. T., "Digital Signature Standard (DSS)", . [I-D.ietf-netconf-http-client-server] Watsen, K., "YANG Groupings for HTTP Clients and HTTP Servers", Work in Progress, Internet-Draft, draft-ietf- netconf-http-client-server-19, 1 March 2024, . [I-D.ietf-netconf-netconf-client-server] Watsen, K., "NETCONF Client and Server Models", Work in Progress, Internet-Draft, draft-ietf-netconf-netconf- client-server-35, 1 March 2024, . [I-D.ietf-netconf-restconf-client-server] Watsen, K., "RESTCONF Client and Server Models", Work in Progress, Internet-Draft, draft-ietf-netconf-restconf- client-server-35, 1 March 2024, . [I-D.ietf-netconf-ssh-client-server] Watsen, K., "YANG Groupings for SSH Clients and SSH Servers", Work in Progress, Internet-Draft, draft-ietf- netconf-ssh-client-server-39, 1 March 2024, . [I-D.ietf-netconf-tcp-client-server] Watsen, K. and M. Scharf, "YANG Groupings for TCP Clients and TCP Servers", Work in Progress, Internet-Draft, draft- ietf-netconf-tcp-client-server-23, 1 March 2024, . [I-D.ietf-netconf-tls-client-server] Watsen, K., "YANG Groupings for TLS Clients and TLS Servers", Work in Progress, Internet-Draft, draft-ietf- netconf-tls-client-server-40, 1 March 2024, . Watsen Expires 17 September 2024 [Page 71] Internet-Draft Groupings for SSH Clients and Servers March 2024 [I-D.ietf-netmod-rfc8407bis] Bierman, A., Boucadair, M., and Q. Wu, "Guidelines for Authors and Reviewers of Documents Containing YANG Data Models", Work in Progress, Internet-Draft, draft-ietf- netmod-rfc8407bis-09, 28 February 2024, . [I-D.ietf-netmod-system-config] Ma, Q., Wu, Q., and C. Feng, "System-defined Configuration", Work in Progress, Internet-Draft, draft- ietf-netmod-system-config-05, 21 February 2024, . [IANA-ENC-ALGS] (IANA), I. A. N. A., "IANA "Encryption Algorithm Names" Sub-registry of the "Secure Shell (SSH) Protocol Parameters" Registry", . [IANA-KEYEX-ALGS] (IANA), I. A. N. A., "IANA "Key Exchange Method Names" Sub-registry of the "Secure Shell (SSH) Protocol Parameters" Registry", . [IANA-MAC-ALGS] (IANA), I. A. N. A., "IANA "MAC Algorithm Names" Sub- registry of the "Secure Shell (SSH) Protocol Parameters" Registry", . [IANA-PUBKEY-ALGS] (IANA), I. A. N. A., "IANA "Public Key Algorithm Names" Sub-registry of the "Secure Shell (SSH) Protocol Parameters" Registry", . [IANA-YANG-PARAMETERS] "YANG Parameters", n.d., . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . Watsen Expires 17 September 2024 [Page 72] Internet-Draft Groupings for SSH Clients and Servers March 2024 [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, . [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, . [RFC8071] Watsen, K., "NETCONF Call Home and RESTCONF Call Home", RFC 8071, DOI 10.17487/RFC8071, February 2017, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018, . [RFC8407] Bierman, A., "Guidelines for Authors and Reviewers of Documents Containing YANG Data Models", BCP 216, RFC 8407, DOI 10.17487/RFC8407, October 2018, . Appendix A. Script to Generate IANA-Maintained YANG Modules This section is not Normative. The Python https://www.python.org script contained in this section will create the four IANA-maintained modules described in this document. Run the script using the command `python gen-yang-modules.py`, to produce four YANG module files in the current directory. Be aware that the script does not attempt to copy the "revision" statements from the previous/current YANG module. Copying the revision statements must be done manually. Watsen Expires 17 September 2024 [Page 73] Internet-Draft Groupings for SSH Clients and Servers March 2024 =============== NOTE: '\' line wrapping per RFC 8792 ================ import re import csv import textwrap import requests import requests_cache from io import StringIO from datetime import datetime # Metadata for the four YANG modules produced by this script MODULES = [ { "csv_url": "https://www.iana.org/assignments/ssh-parameters/\ ssh-parameters-17.csv", "spaced_name": "encryption", "hypenated_name": "encryption", "prefix": "sshea", "description": """ "This module defines enumerations for \ the encryption algorithms defined in the 'Encryption Algorithm Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained by IANA.""", }, { "csv_url": "https://www.iana.org/assignments/ssh-parameters/\ ssh-parameters-19.csv", "spaced_name": "public key", "hypenated_name": "public-key", "prefix": "sshpka", "description": """ "This module defines enumerations for \ the public key algorithms defined in the 'Public Key Algorithm Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained by IANA.""" }, { "csv_url": "https://www.iana.org/assignments/ssh-parameters/\ ssh-parameters-18.csv", "spaced_name": "mac", "hypenated_name": "mac", "prefix": "sshma", "description": """ "This module defines enumerations for \ the MAC algorithms defined in the 'MAC Algorithm Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained by IANA.""" Watsen Expires 17 September 2024 [Page 74] Internet-Draft Groupings for SSH Clients and Servers March 2024 }, { "csv_url": "https://www.iana.org/assignments/ssh-parameters/\ ssh-parameters-16.csv", "spaced_name": "key exchange", "hypenated_name": "key-exchange", "prefix": "sshkea", "description": """ "This module defines enumerations for \ the key exchange algorithms defined in the 'Key Exchange Method Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained by IANA.""" }, ] def create_module_begin(module, f): # Define template for all four modules PREAMBLE_TEMPLATE=""" module iana-ssh-HNAME-algs { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:iana-ssh-HNAME-algs"; prefix PREFIX; organization "Internet Assigned Numbers Authority (IANA)"; contact "Postal: ICANN 12025 Waterfront Drive, Suite 300 Los Angeles, CA 90094-2536 United States of America Tel: +1 310 301 5800 Email: iana@iana.org"; description DESCRIPTION Copyright (c) YEAR IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Watsen Expires 17 September 2024 [Page 75] Internet-Draft Groupings for SSH Clients and Servers March 2024 Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). The initial version of this YANG module is part of RFC EEEE (https://www.rfc-editor.org/info/rfcEEEE); see the RFC itself for full legal notices. All versions of this module are published by IANA at https://www.iana.org/assignments/yang-parameters."; revision DATE { description "This initial version of the module was created using the script defined in RFC EEEE to reflect the contents of the SNAME algorithms registry maintained by IANA."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } typedef ssh-HNAME-algorithm { type enumeration { """ # Replacements rep = { "DATE": datetime.today().strftime('%Y-%m-%d'), "YEAR": datetime.today().strftime('%Y'), "SNAME": module["spaced_name"], "HNAME": module["hypenated_name"], "PREFIX": module["prefix"], "DESCRIPTION": module["description"] } # Do the replacement rep = dict((re.escape(k), v) for k, v in rep.items()) pattern = re.compile("|".join(rep.keys())) text = pattern.sub(lambda m: rep[re.escape(m.group(0))], PREAMBL\ E_TEMPLATE) # Write preamble into the file f.write(text) def create_module_body(module, f): # Fetch the current CSV file from IANA r = requests.get(module["csv_url"]) assert(r.status_code == 200) Watsen Expires 17 September 2024 [Page 76] Internet-Draft Groupings for SSH Clients and Servers March 2024 # Ascertain the first CSV column's name with StringIO(r.text) as csv_file: csv_reader = csv.reader(csv_file) for row in csv_reader: first_colname = row[0] break # Parse each CSV line with StringIO(r.text) as csv_file: csv_reader = csv.DictReader(csv_file) for row in csv_reader: # Extract just the ref refs = row["Reference"][1:-1] # remove the '[' and ']' \ chars refs = refs.split("][") # There may be more than one ref titles = [] for ref in refs: # Ascertain the ref's title if ref.startswith("RFC"): # Fetch the current BIBTEX entry bibtex_url="https://datatracker.ietf.org/doc/"+ \ ref.lower() + "/bibtex/" r = requests.get(bibtex_url) assert r.status_code == 200, "Could not GET " + \ bibtex_url # Append to 'titles' value from the "title" line for item in r.text.split("\n"): if "title =" in item: titles.append(re.sub('.*{{(.*)}}.*', r'\\ g<1>', item)) break else: raise Exception("RFC title not found") # Insert a space: "RFCXXXX" --> "RFC XXXX" index = refs.index(ref) refs[index] = "RFC " + ref[3:] elif ref.startswith("FIPS"): # Special case for FIPS, since no bibtex to fetch if ref == "FIPS 46-3" or ref == "FIPS-46-3": Watsen Expires 17 September 2024 [Page 77] Internet-Draft Groupings for SSH Clients and Servers March 2024 titles.append("Data Encryption Standard (DES\ )") else: raise Exception("FIPS ref not found") else: raise Exception("ref not found") # Function used below def write_enumeration(alg): f.write('\n') f.write(f' enum {alg} {{\n') if "HISTORIC" in row["Note"]: f.write(f' status obsolete;\n') elif "OK to Implement" in row: if "MUST NOT" in row["OK to Implement"]: f.write(f' status obsolete;\n') elif "SHOULD NOT" in row["OK to Implement"]: f.write(f' status deprecated;\n') f.write(f' description\n') description = f' "Enumeration for the \'{al\ g}\' algorithm.' if "Section" in row["Note"]: description += " " + row["Note"] description += '";' description = textwrap.fill(description, width=69, s\ ubsequent_indent=" ") f.write(f'{description}\n') f.write(' reference\n') f.write(' "') if row["Reference"] == "": f.write(' Missing in IANA registry.') else: ref_len = len(refs) for i in range(ref_len): ref = refs[i] f.write(f'{ref}:\n') title = " " + titles[i] if i == ref_len - 1: title += '";' title = textwrap.fill(title, width=67, subse\ quent_indent=" ") f.write(f'{title}') if i != ref_len - 1: f.write('\n ') f.write('\n') f.write(' }\n') Watsen Expires 17 September 2024 [Page 78] Internet-Draft Groupings for SSH Clients and Servers March 2024 # Write one or more "enumeration" statements if not row[first_colname].endswith("-*"): # just one enu\ meration # Avoid duplicate entries caused by the "ecdh-sha2-*\ " family expansion if not row[first_colname].startswith("ecdh-sha2-nist\ p"): write_enumeration(row[first_colname]) else: # a family of enumerations curve_ids = [ "nistp256", "nistp384", "nistp521", "1.3.132.0.1", "1.2.840.10045.3.1.1", "1.3.132.0.33", "1.3.132.0.26", "1.3.132.0.27", "1.3.132.0.16", "1.3.132.0.36", "1.3.132.0.37", "1.3.132.0.38", ] for curve_id in curve_ids: write_enumeration(row[first_colname][:-1] + curv\ e_id) def create_module_end(module, f): # Close out the enumeration, typedef, and module f.write(" }\n") f.write(" description\n") f.write(f' "An enumeration for SSH {module["spaced_name"]} \ algorithms.";\n') f.write(" }\n") f.write('\n') f.write('}\n') def create_module(module): # Install cache for 8x speedup requests_cache.install_cache() # ascertain yang module's name yang_module_name = "iana-ssh-" + module["hypenated_name"] + "-al\ gs.yang" Watsen Expires 17 September 2024 [Page 79] Internet-Draft Groupings for SSH Clients and Servers March 2024 # create yang module file with open(yang_module_name, "w") as f: create_module_begin(module, f) create_module_body(module, f) create_module_end(module, f) def main(): for module in MODULES: create_module(module) if __name__ == "__main__": main() A.1. Initial Module for the "Encryption Algorithm Names" Registry Following are the complete contents to the initial IANA-maintained YANG module. Please note that the date "2024-03-16" reflects the day on which the extraction occurred. Applications SHOULD use the IANA- maintained module, not the module defined in this draft. This YANG module has normative references to [FIPS 46-3], [RFC4253], [RFC4344], [RFC5647], and [RFC8758]. file "iana-ssh-encryption-algs@2024-03-16.yang" module iana-ssh-encryption-algs { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:iana-ssh-encryption-algs"; prefix sshea; organization "Internet Assigned Numbers Authority (IANA)"; contact "Postal: ICANN 12025 Waterfront Drive, Suite 300 Los Angeles, CA 90094-2536 United States of America Tel: +1 310 301 5800 Email: iana@iana.org"; description "This module defines enumerations for the encryption algorithms defined in the 'Encryption Algorithm Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained Watsen Expires 17 September 2024 [Page 80] Internet-Draft Groupings for SSH Clients and Servers March 2024 by IANA. Copyright (c) 2024 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). The initial version of this YANG module is part of RFC EEEE (https://www.rfc-editor.org/info/rfcEEEE); see the RFC itself for full legal notices. All versions of this module are published by IANA at https://www.iana.org/assignments/yang-parameters."; revision 2024-03-16 { description "This initial version of the module was created using the script defined in RFC EEEE to reflect the contents of the encryption algorithms registry maintained by IANA."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } typedef ssh-encryption-algorithm { type enumeration { enum 3des-cbc { description "Enumeration for the '3des-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum blowfish-cbc { description "Enumeration for the 'blowfish-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } Watsen Expires 17 September 2024 [Page 81] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum twofish256-cbc { description "Enumeration for the 'twofish256-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum twofish-cbc { description "Enumeration for the 'twofish-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum twofish192-cbc { description "Enumeration for the 'twofish192-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum twofish128-cbc { description "Enumeration for the 'twofish128-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum aes256-cbc { description "Enumeration for the 'aes256-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum aes192-cbc { description "Enumeration for the 'aes192-cbc' algorithm. Section 6.3"; reference "RFC 4253: Watsen Expires 17 September 2024 [Page 82] Internet-Draft Groupings for SSH Clients and Servers March 2024 The Secure Shell (SSH) Transport Layer Protocol"; } enum aes128-cbc { description "Enumeration for the 'aes128-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum serpent256-cbc { description "Enumeration for the 'serpent256-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum serpent192-cbc { description "Enumeration for the 'serpent192-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum serpent128-cbc { description "Enumeration for the 'serpent128-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum arcfour { status obsolete; description "Enumeration for the 'arcfour' algorithm."; reference "RFC 8758: Deprecating RC4 in Secure Shell (SSH)"; } enum idea-cbc { Watsen Expires 17 September 2024 [Page 83] Internet-Draft Groupings for SSH Clients and Servers March 2024 description "Enumeration for the 'idea-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum cast128-cbc { description "Enumeration for the 'cast128-cbc' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum none { description "Enumeration for the 'none' algorithm. Section 6.3"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum des-cbc { status obsolete; description "Enumeration for the 'des-cbc' algorithm."; reference "FIPS-46-3: Data Encryption Standard (DES)"; } enum arcfour128 { status obsolete; description "Enumeration for the 'arcfour128' algorithm."; reference "RFC 8758: Deprecating RC4 in Secure Shell (SSH)"; } enum arcfour256 { status obsolete; description "Enumeration for the 'arcfour256' algorithm."; reference "RFC 8758: Deprecating RC4 in Secure Shell (SSH)"; Watsen Expires 17 September 2024 [Page 84] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum aes128-ctr { description "Enumeration for the 'aes128-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum aes192-ctr { description "Enumeration for the 'aes192-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum aes256-ctr { description "Enumeration for the 'aes256-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum 3des-ctr { description "Enumeration for the '3des-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum blowfish-ctr { description "Enumeration for the 'blowfish-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum twofish128-ctr { Watsen Expires 17 September 2024 [Page 85] Internet-Draft Groupings for SSH Clients and Servers March 2024 description "Enumeration for the 'twofish128-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum twofish192-ctr { description "Enumeration for the 'twofish192-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum twofish256-ctr { description "Enumeration for the 'twofish256-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum serpent128-ctr { description "Enumeration for the 'serpent128-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum serpent192-ctr { description "Enumeration for the 'serpent192-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum serpent256-ctr { description "Enumeration for the 'serpent256-ctr' algorithm."; reference Watsen Expires 17 September 2024 [Page 86] Internet-Draft Groupings for SSH Clients and Servers March 2024 "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum idea-ctr { description "Enumeration for the 'idea-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum cast128-ctr { description "Enumeration for the 'cast128-ctr' algorithm."; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } enum AEAD_AES_128_GCM { description "Enumeration for the 'AEAD_AES_128_GCM' algorithm. Section 6.1"; reference "RFC 5647: AES Galois Counter Mode for the Secure Shell Transport Layer Protocol"; } enum AEAD_AES_256_GCM { description "Enumeration for the 'AEAD_AES_256_GCM' algorithm. Section 6.2"; reference "RFC 5647: AES Galois Counter Mode for the Secure Shell Transport Layer Protocol"; } } description "An enumeration for SSH encryption algorithms."; } } Watsen Expires 17 September 2024 [Page 87] Internet-Draft Groupings for SSH Clients and Servers March 2024 A.2. Initial Module for the "MAC Algorithm Names" Registry Following are the complete contents to the initial IANA-maintained YANG module. Please note that the date "2024-03-16" reflects the day on which the extraction occurred. Applications SHOULD use the IANA- maintained module, not the module defined in this draft. This YANG module has normative references [RFC4253], [RFC5647], and [RFC6668]. file "iana-ssh-mac-algs@2024-03-16.yang" module iana-ssh-mac-algs { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:iana-ssh-mac-algs"; prefix sshma; organization "Internet Assigned Numbers Authority (IANA)"; contact "Postal: ICANN 12025 Waterfront Drive, Suite 300 Los Angeles, CA 90094-2536 United States of America Tel: +1 310 301 5800 Email: iana@iana.org"; description "This module defines enumerations for the MAC algorithms defined in the 'MAC Algorithm Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained by IANA. Copyright (c) 2024 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). The initial version of this YANG module is part of RFC EEEE (https://www.rfc-editor.org/info/rfcEEEE); see the RFC Watsen Expires 17 September 2024 [Page 88] Internet-Draft Groupings for SSH Clients and Servers March 2024 itself for full legal notices. All versions of this module are published by IANA at https://www.iana.org/assignments/yang-parameters."; revision 2024-03-16 { description "This initial version of the module was created using the script defined in RFC EEEE to reflect the contents of the mac algorithms registry maintained by IANA."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } typedef ssh-mac-algorithm { type enumeration { enum hmac-sha1 { description "Enumeration for the 'hmac-sha1' algorithm. Section 6.4"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum hmac-sha1-96 { description "Enumeration for the 'hmac-sha1-96' algorithm. Section 6.4"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum hmac-md5 { description "Enumeration for the 'hmac-md5' algorithm. Section 6.4"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum hmac-md5-96 { description "Enumeration for the 'hmac-md5-96' algorithm. Section 6.4"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; Watsen Expires 17 September 2024 [Page 89] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum none { description "Enumeration for the 'none' algorithm. Section 6.4"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum AEAD_AES_128_GCM { description "Enumeration for the 'AEAD_AES_128_GCM' algorithm. Section 6.1"; reference "RFC 5647: AES Galois Counter Mode for the Secure Shell Transport Layer Protocol"; } enum AEAD_AES_256_GCM { description "Enumeration for the 'AEAD_AES_256_GCM' algorithm. Section 6.2"; reference "RFC 5647: AES Galois Counter Mode for the Secure Shell Transport Layer Protocol"; } enum hmac-sha2-256 { description "Enumeration for the 'hmac-sha2-256' algorithm. Section 2"; reference "RFC 6668: SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport Layer Protocol"; } enum hmac-sha2-512 { description "Enumeration for the 'hmac-sha2-512' algorithm. Section 2"; reference "RFC 6668: SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport Layer Protocol"; } } Watsen Expires 17 September 2024 [Page 90] Internet-Draft Groupings for SSH Clients and Servers March 2024 description "An enumeration for SSH mac algorithms."; } } A.3. Initial Module for the "Public Key Algorithm Names" Registry Following are the complete contents to the initial IANA-maintained YANG module. Please note that the date "2024-03-16" reflects the day on which the extraction occurred. Applications SHOULD use the IANA- maintained module, not the module defined in this draft. This YANG module has normative references [RFC4253], [RFC4462], [RFC5656], [RFC6187], [RFC8332], and [RFC8709]. file "iana-ssh-public-key-algs@2024-03-16.yang" module iana-ssh-public-key-algs { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:iana-ssh-public-key-algs"; prefix sshpka; organization "Internet Assigned Numbers Authority (IANA)"; contact "Postal: ICANN 12025 Waterfront Drive, Suite 300 Los Angeles, CA 90094-2536 United States of America Tel: +1 310 301 5800 Email: iana@iana.org"; description "This module defines enumerations for the public key algorithms defined in the 'Public Key Algorithm Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained by IANA. Copyright (c) 2024 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised Watsen Expires 17 September 2024 [Page 91] Internet-Draft Groupings for SSH Clients and Servers March 2024 BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). The initial version of this YANG module is part of RFC EEEE (https://www.rfc-editor.org/info/rfcEEEE); see the RFC itself for full legal notices. All versions of this module are published by IANA at https://www.iana.org/assignments/yang-parameters."; revision 2024-03-16 { description "This initial version of the module was created using the script defined in RFC EEEE to reflect the contents of the public key algorithms registry maintained by IANA."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } typedef ssh-public-key-algorithm { type enumeration { enum ssh-dss { description "Enumeration for the 'ssh-dss' algorithm. Section 6.6"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum ssh-rsa { description "Enumeration for the 'ssh-rsa' algorithm. Section 6.6"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum rsa-sha2-256 { description "Enumeration for the 'rsa-sha2-256' algorithm. Section 3"; reference "RFC 8332: Use of RSA Keys with SHA-256 and SHA-512 in the Secure Shell (SSH) Protocol"; } Watsen Expires 17 September 2024 [Page 92] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum rsa-sha2-512 { description "Enumeration for the 'rsa-sha2-512' algorithm. Section 3"; reference "RFC 8332: Use of RSA Keys with SHA-256 and SHA-512 in the Secure Shell (SSH) Protocol"; } enum spki-sign-rsa { description "Enumeration for the 'spki-sign-rsa' algorithm. Section 6.6"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum spki-sign-dss { description "Enumeration for the 'spki-sign-dss' algorithm. Section 6.6"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum pgp-sign-rsa { description "Enumeration for the 'pgp-sign-rsa' algorithm. Section 6.6"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum pgp-sign-dss { description "Enumeration for the 'pgp-sign-dss' algorithm. Section 6.6"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum null { description "Enumeration for the 'null' algorithm. Section 5"; Watsen Expires 17 September 2024 [Page 93] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol"; } enum ecdsa-sha2-nistp256 { description "Enumeration for the 'ecdsa-sha2-nistp256' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-nistp384 { description "Enumeration for the 'ecdsa-sha2-nistp384' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-nistp521 { description "Enumeration for the 'ecdsa-sha2-nistp521' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-1.3.132.0.1 { description "Enumeration for the 'ecdsa-sha2-1.3.132.0.1' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-1.2.840.10045.3.1.1 { description "Enumeration for the 'ecdsa-sha2-1.2.840.10045.3.1.1' algorithm."; reference Watsen Expires 17 September 2024 [Page 94] Internet-Draft Groupings for SSH Clients and Servers March 2024 "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-1.3.132.0.33 { description "Enumeration for the 'ecdsa-sha2-1.3.132.0.33' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-1.3.132.0.26 { description "Enumeration for the 'ecdsa-sha2-1.3.132.0.26' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-1.3.132.0.27 { description "Enumeration for the 'ecdsa-sha2-1.3.132.0.27' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-1.3.132.0.16 { description "Enumeration for the 'ecdsa-sha2-1.3.132.0.16' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-1.3.132.0.36 { description "Enumeration for the 'ecdsa-sha2-1.3.132.0.36' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; Watsen Expires 17 September 2024 [Page 95] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum ecdsa-sha2-1.3.132.0.37 { description "Enumeration for the 'ecdsa-sha2-1.3.132.0.37' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdsa-sha2-1.3.132.0.38 { description "Enumeration for the 'ecdsa-sha2-1.3.132.0.38' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum x509v3-ssh-dss { description "Enumeration for the 'x509v3-ssh-dss' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ssh-rsa { description "Enumeration for the 'x509v3-ssh-rsa' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-rsa2048-sha256 { description "Enumeration for the 'x509v3-rsa2048-sha256' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-nistp256 { description "Enumeration for the 'x509v3-ecdsa-sha2-nistp256' algorithm."; Watsen Expires 17 September 2024 [Page 96] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-nistp384 { description "Enumeration for the 'x509v3-ecdsa-sha2-nistp384' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-nistp521 { description "Enumeration for the 'x509v3-ecdsa-sha2-nistp521' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-1.3.132.0.1 { description "Enumeration for the 'x509v3-ecdsa-sha2-1.3.132.0.1' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-1.2.840.10045.3.1.1 { description "Enumeration for the 'x509v3-ecdsa- sha2-1.2.840.10045.3.1.1' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-1.3.132.0.33 { description "Enumeration for the 'x509v3-ecdsa-sha2-1.3.132.0.33' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; Watsen Expires 17 September 2024 [Page 97] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum x509v3-ecdsa-sha2-1.3.132.0.26 { description "Enumeration for the 'x509v3-ecdsa-sha2-1.3.132.0.26' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-1.3.132.0.27 { description "Enumeration for the 'x509v3-ecdsa-sha2-1.3.132.0.27' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-1.3.132.0.16 { description "Enumeration for the 'x509v3-ecdsa-sha2-1.3.132.0.16' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-1.3.132.0.36 { description "Enumeration for the 'x509v3-ecdsa-sha2-1.3.132.0.36' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-1.3.132.0.37 { description "Enumeration for the 'x509v3-ecdsa-sha2-1.3.132.0.37' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum x509v3-ecdsa-sha2-1.3.132.0.38 { Watsen Expires 17 September 2024 [Page 98] Internet-Draft Groupings for SSH Clients and Servers March 2024 description "Enumeration for the 'x509v3-ecdsa-sha2-1.3.132.0.38' algorithm."; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } enum ssh-ed25519 { description "Enumeration for the 'ssh-ed25519' algorithm."; reference "RFC 8709: Ed25519 and Ed448 Public Key Algorithms for the Secure Shell (SSH) Protocol"; } enum ssh-ed448 { description "Enumeration for the 'ssh-ed448' algorithm."; reference "RFC 8709: Ed25519 and Ed448 Public Key Algorithms for the Secure Shell (SSH) Protocol"; } } description "An enumeration for SSH public key algorithms."; } } A.4. Initial Module for the "Key Exchange Method Names" Registry Following are the complete contents to the initial IANA-maintained YANG module. Please note that the date "2024-03-16" reflects the day on which the extraction occurred. Applications SHOULD use the IANA- maintained module, not the module defined in this draft. This YANG module has normative references to [RFC4419], [RFC4432], [RFC5656], [RFC8268], [RFC8308], [RFC8731], [RFC8732]. file "iana-ssh-key-exchange-algs@2024-03-16.yang" Watsen Expires 17 September 2024 [Page 99] Internet-Draft Groupings for SSH Clients and Servers March 2024 module iana-ssh-key-exchange-algs { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:iana-ssh-key-exchange-algs"; prefix sshkea; organization "Internet Assigned Numbers Authority (IANA)"; contact "Postal: ICANN 12025 Waterfront Drive, Suite 300 Los Angeles, CA 90094-2536 United States of America Tel: +1 310 301 5800 Email: iana@iana.org"; description "This module defines enumerations for the key exchange algorithms defined in the 'Key Exchange Method Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained by IANA. Copyright (c) 2024 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). The initial version of this YANG module is part of RFC EEEE (https://www.rfc-editor.org/info/rfcEEEE); see the RFC itself for full legal notices. All versions of this module are published by IANA at https://www.iana.org/assignments/yang-parameters."; revision 2024-03-16 { description "This initial version of the module was created using the script defined in RFC EEEE to reflect the contents of the key exchange algorithms registry maintained by IANA."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } Watsen Expires 17 September 2024 [Page 100] Internet-Draft Groupings for SSH Clients and Servers March 2024 typedef ssh-key-exchange-algorithm { type enumeration { enum diffie-hellman-group-exchange-sha1 { status deprecated; description "Enumeration for the 'diffie-hellman-group-exchange-sha1' algorithm. Section 4.1"; reference "RFC 4419: Diffie-Hellman Group Exchange for the Secure Shell (SSH) Transport Layer Protocol RFC 8270: Increase the Secure Shell Minimum Recommended Diffie- Hellman Modulus Size to 2048 Bits"; } enum diffie-hellman-group-exchange-sha256 { description "Enumeration for the 'diffie-hellman-group-exchange-sha256' algorithm. Section 4.2"; reference "RFC 4419: Diffie-Hellman Group Exchange for the Secure Shell (SSH) Transport Layer Protocol RFC 8270: Increase the Secure Shell Minimum Recommended Diffie- Hellman Modulus Size to 2048 Bits"; } enum diffie-hellman-group1-sha1 { status deprecated; description "Enumeration for the 'diffie-hellman-group1-sha1' algorithm. Section 8.1"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } enum diffie-hellman-group14-sha1 { description "Enumeration for the 'diffie-hellman-group14-sha1' algorithm. Section 8.2"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } Watsen Expires 17 September 2024 [Page 101] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum diffie-hellman-group14-sha256 { description "Enumeration for the 'diffie-hellman-group14-sha256' algorithm."; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; } enum diffie-hellman-group15-sha512 { description "Enumeration for the 'diffie-hellman-group15-sha512' algorithm."; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; } enum diffie-hellman-group16-sha512 { description "Enumeration for the 'diffie-hellman-group16-sha512' algorithm."; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; } enum diffie-hellman-group17-sha512 { description "Enumeration for the 'diffie-hellman-group17-sha512' algorithm."; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; } enum diffie-hellman-group18-sha512 { description "Enumeration for the 'diffie-hellman-group18-sha512' algorithm."; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; Watsen Expires 17 September 2024 [Page 102] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum ecdh-sha2-nistp256 { description "Enumeration for the 'ecdh-sha2-nistp256' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-nistp384 { description "Enumeration for the 'ecdh-sha2-nistp384' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-nistp521 { description "Enumeration for the 'ecdh-sha2-nistp521' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-1.3.132.0.1 { description "Enumeration for the 'ecdh-sha2-1.3.132.0.1' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-1.2.840.10045.3.1.1 { description "Enumeration for the 'ecdh-sha2-1.2.840.10045.3.1.1' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } Watsen Expires 17 September 2024 [Page 103] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum ecdh-sha2-1.3.132.0.33 { description "Enumeration for the 'ecdh-sha2-1.3.132.0.33' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-1.3.132.0.26 { description "Enumeration for the 'ecdh-sha2-1.3.132.0.26' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-1.3.132.0.27 { description "Enumeration for the 'ecdh-sha2-1.3.132.0.27' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-1.3.132.0.16 { description "Enumeration for the 'ecdh-sha2-1.3.132.0.16' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-1.3.132.0.36 { description "Enumeration for the 'ecdh-sha2-1.3.132.0.36' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-1.3.132.0.37 { description "Enumeration for the 'ecdh-sha2-1.3.132.0.37' algorithm."; Watsen Expires 17 September 2024 [Page 104] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecdh-sha2-1.3.132.0.38 { description "Enumeration for the 'ecdh-sha2-1.3.132.0.38' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum ecmqv-sha2 { description "Enumeration for the 'ecmqv-sha2' algorithm."; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } enum gss-group1-sha1-nistp256 { status deprecated; description "Enumeration for the 'gss-group1-sha1-nistp256' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-nistp384 { status deprecated; description "Enumeration for the 'gss-group1-sha1-nistp384' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Watsen Expires 17 September 2024 [Page 105] Internet-Draft Groupings for SSH Clients and Servers March 2024 Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-nistp521 { status deprecated; description "Enumeration for the 'gss-group1-sha1-nistp521' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-1.3.132.0.1 { status deprecated; description "Enumeration for the 'gss-group1-sha1-1.3.132.0.1' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-1.2.840.10045.3.1.1 { status deprecated; description "Enumeration for the 'gss-group1-sha1-1.2.840.10045.3.1.1' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface Watsen Expires 17 September 2024 [Page 106] Internet-Draft Groupings for SSH Clients and Servers March 2024 (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-1.3.132.0.33 { status deprecated; description "Enumeration for the 'gss-group1-sha1-1.3.132.0.33' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-1.3.132.0.26 { status deprecated; description "Enumeration for the 'gss-group1-sha1-1.3.132.0.26' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-1.3.132.0.27 { status deprecated; description "Enumeration for the 'gss-group1-sha1-1.3.132.0.27' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 17 September 2024 [Page 107] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum gss-group1-sha1-1.3.132.0.16 { status deprecated; description "Enumeration for the 'gss-group1-sha1-1.3.132.0.16' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-1.3.132.0.36 { status deprecated; description "Enumeration for the 'gss-group1-sha1-1.3.132.0.36' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-1.3.132.0.37 { status deprecated; description "Enumeration for the 'gss-group1-sha1-1.3.132.0.37' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group1-sha1-1.3.132.0.38 { status deprecated; description Watsen Expires 17 September 2024 [Page 108] Internet-Draft Groupings for SSH Clients and Servers March 2024 "Enumeration for the 'gss-group1-sha1-1.3.132.0.38' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-nistp256 { status deprecated; description "Enumeration for the 'gss-group14-sha1-nistp256' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-nistp384 { status deprecated; description "Enumeration for the 'gss-group14-sha1-nistp384' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-nistp521 { status deprecated; description "Enumeration for the 'gss-group14-sha1-nistp521' algorithm."; reference Watsen Expires 17 September 2024 [Page 109] Internet-Draft Groupings for SSH Clients and Servers March 2024 "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.3.132.0.1 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.3.132.0.1' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.2.840.10045.3.1.1 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.2.840.10045.3.1.1' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.3.132.0.33 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.3.132.0.33' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Watsen Expires 17 September 2024 [Page 110] Internet-Draft Groupings for SSH Clients and Servers March 2024 Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.3.132.0.26 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.3.132.0.26' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.3.132.0.27 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.3.132.0.27' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.3.132.0.16 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.3.132.0.16' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface Watsen Expires 17 September 2024 [Page 111] Internet-Draft Groupings for SSH Clients and Servers March 2024 (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.3.132.0.36 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.3.132.0.36' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.3.132.0.37 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.3.132.0.37' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha1-1.3.132.0.38 { status deprecated; description "Enumeration for the 'gss-group14-sha1-1.3.132.0.38' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 17 September 2024 [Page 112] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum gss-gex-sha1-nistp256 { status deprecated; description "Enumeration for the 'gss-gex-sha1-nistp256' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-nistp384 { status deprecated; description "Enumeration for the 'gss-gex-sha1-nistp384' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-nistp521 { status deprecated; description "Enumeration for the 'gss-gex-sha1-nistp521' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.3.132.0.1 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.3.132.0.1' algorithm."; reference Watsen Expires 17 September 2024 [Page 113] Internet-Draft Groupings for SSH Clients and Servers March 2024 "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.2.840.10045.3.1.1 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.2.840.10045.3.1.1' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.3.132.0.33 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.3.132.0.33' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.3.132.0.26 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.3.132.0.26' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Watsen Expires 17 September 2024 [Page 114] Internet-Draft Groupings for SSH Clients and Servers March 2024 Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.3.132.0.27 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.3.132.0.27' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.3.132.0.16 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.3.132.0.16' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.3.132.0.36 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.3.132.0.36' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface Watsen Expires 17 September 2024 [Page 115] Internet-Draft Groupings for SSH Clients and Servers March 2024 (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.3.132.0.37 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.3.132.0.37' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-gex-sha1-1.3.132.0.38 { status deprecated; description "Enumeration for the 'gss-gex-sha1-1.3.132.0.38' algorithm."; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss- { description "Enumeration for the 'gss-' algorithm. Section 2.6"; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol"; } enum rsa1024-sha1 { status obsolete; description "Enumeration for the 'rsa1024-sha1' algorithm."; reference Watsen Expires 17 September 2024 [Page 116] Internet-Draft Groupings for SSH Clients and Servers March 2024 "RFC 4432: RSA Key Exchange for the Secure Shell (SSH) Transport Layer Protocol"; } enum rsa2048-sha256 { description "Enumeration for the 'rsa2048-sha256' algorithm."; reference "RFC 4432: RSA Key Exchange for the Secure Shell (SSH) Transport Layer Protocol"; } enum ext-info-s { description "Enumeration for the 'ext-info-s' algorithm. Section 2"; reference "RFC 8308: Extension Negotiation in the Secure Shell (SSH) Protocol"; } enum ext-info-c { description "Enumeration for the 'ext-info-c' algorithm. Section 2"; reference "RFC 8308: Extension Negotiation in the Secure Shell (SSH) Protocol"; } enum gss-group14-sha256-nistp256 { description "Enumeration for the 'gss-group14-sha256-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-nistp384 { description "Enumeration for the 'gss-group14-sha256-nistp384' algorithm."; reference "RFC 8732: Watsen Expires 17 September 2024 [Page 117] Internet-Draft Groupings for SSH Clients and Servers March 2024 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-nistp521 { description "Enumeration for the 'gss-group14-sha256-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.3.132.0.1 { description "Enumeration for the 'gss-group14-sha256-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- group14-sha256-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.3.132.0.33 { description "Enumeration for the 'gss-group14-sha256-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.3.132.0.26 { description "Enumeration for the 'gss-group14-sha256-1.3.132.0.26' algorithm."; Watsen Expires 17 September 2024 [Page 118] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.3.132.0.27 { description "Enumeration for the 'gss-group14-sha256-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.3.132.0.16 { description "Enumeration for the 'gss-group14-sha256-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.3.132.0.36 { description "Enumeration for the 'gss-group14-sha256-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.3.132.0.37 { description "Enumeration for the 'gss-group14-sha256-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group14-sha256-1.3.132.0.38 { description Watsen Expires 17 September 2024 [Page 119] Internet-Draft Groupings for SSH Clients and Servers March 2024 "Enumeration for the 'gss-group14-sha256-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-nistp256 { description "Enumeration for the 'gss-group15-sha512-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-nistp384 { description "Enumeration for the 'gss-group15-sha512-nistp384' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-nistp521 { description "Enumeration for the 'gss-group15-sha512-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-1.3.132.0.1 { description "Enumeration for the 'gss-group15-sha512-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 17 September 2024 [Page 120] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum gss-group15-sha512-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- group15-sha512-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-1.3.132.0.33 { description "Enumeration for the 'gss-group15-sha512-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-1.3.132.0.26 { description "Enumeration for the 'gss-group15-sha512-1.3.132.0.26' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-1.3.132.0.27 { description "Enumeration for the 'gss-group15-sha512-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-1.3.132.0.16 { description "Enumeration for the 'gss-group15-sha512-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 17 September 2024 [Page 121] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum gss-group15-sha512-1.3.132.0.36 { description "Enumeration for the 'gss-group15-sha512-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-1.3.132.0.37 { description "Enumeration for the 'gss-group15-sha512-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group15-sha512-1.3.132.0.38 { description "Enumeration for the 'gss-group15-sha512-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-nistp256 { description "Enumeration for the 'gss-group16-sha512-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-nistp384 { description "Enumeration for the 'gss-group16-sha512-nistp384' algorithm."; reference "RFC 8732: Watsen Expires 17 September 2024 [Page 122] Internet-Draft Groupings for SSH Clients and Servers March 2024 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-nistp521 { description "Enumeration for the 'gss-group16-sha512-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.3.132.0.1 { description "Enumeration for the 'gss-group16-sha512-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- group16-sha512-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.3.132.0.33 { description "Enumeration for the 'gss-group16-sha512-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.3.132.0.26 { description "Enumeration for the 'gss-group16-sha512-1.3.132.0.26' algorithm."; Watsen Expires 17 September 2024 [Page 123] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.3.132.0.27 { description "Enumeration for the 'gss-group16-sha512-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.3.132.0.16 { description "Enumeration for the 'gss-group16-sha512-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.3.132.0.36 { description "Enumeration for the 'gss-group16-sha512-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.3.132.0.37 { description "Enumeration for the 'gss-group16-sha512-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group16-sha512-1.3.132.0.38 { description Watsen Expires 17 September 2024 [Page 124] Internet-Draft Groupings for SSH Clients and Servers March 2024 "Enumeration for the 'gss-group16-sha512-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-nistp256 { description "Enumeration for the 'gss-group17-sha512-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-nistp384 { description "Enumeration for the 'gss-group17-sha512-nistp384' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-nistp521 { description "Enumeration for the 'gss-group17-sha512-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-1.3.132.0.1 { description "Enumeration for the 'gss-group17-sha512-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 17 September 2024 [Page 125] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum gss-group17-sha512-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- group17-sha512-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-1.3.132.0.33 { description "Enumeration for the 'gss-group17-sha512-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-1.3.132.0.26 { description "Enumeration for the 'gss-group17-sha512-1.3.132.0.26' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-1.3.132.0.27 { description "Enumeration for the 'gss-group17-sha512-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-1.3.132.0.16 { description "Enumeration for the 'gss-group17-sha512-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 17 September 2024 [Page 126] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum gss-group17-sha512-1.3.132.0.36 { description "Enumeration for the 'gss-group17-sha512-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-1.3.132.0.37 { description "Enumeration for the 'gss-group17-sha512-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group17-sha512-1.3.132.0.38 { description "Enumeration for the 'gss-group17-sha512-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-nistp256 { description "Enumeration for the 'gss-group18-sha512-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-nistp384 { description "Enumeration for the 'gss-group18-sha512-nistp384' algorithm."; reference "RFC 8732: Watsen Expires 17 September 2024 [Page 127] Internet-Draft Groupings for SSH Clients and Servers March 2024 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-nistp521 { description "Enumeration for the 'gss-group18-sha512-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.3.132.0.1 { description "Enumeration for the 'gss-group18-sha512-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- group18-sha512-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.3.132.0.33 { description "Enumeration for the 'gss-group18-sha512-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.3.132.0.26 { description "Enumeration for the 'gss-group18-sha512-1.3.132.0.26' algorithm."; Watsen Expires 17 September 2024 [Page 128] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.3.132.0.27 { description "Enumeration for the 'gss-group18-sha512-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.3.132.0.16 { description "Enumeration for the 'gss-group18-sha512-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.3.132.0.36 { description "Enumeration for the 'gss-group18-sha512-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.3.132.0.37 { description "Enumeration for the 'gss-group18-sha512-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-group18-sha512-1.3.132.0.38 { description Watsen Expires 17 September 2024 [Page 129] Internet-Draft Groupings for SSH Clients and Servers March 2024 "Enumeration for the 'gss-group18-sha512-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-nistp256 { description "Enumeration for the 'gss-nistp256-sha256-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-nistp384 { description "Enumeration for the 'gss-nistp256-sha256-nistp384' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-nistp521 { description "Enumeration for the 'gss-nistp256-sha256-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-1.3.132.0.1 { description "Enumeration for the 'gss-nistp256-sha256-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 17 September 2024 [Page 130] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum gss-nistp256-sha256-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- nistp256-sha256-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-1.3.132.0.33 { description "Enumeration for the 'gss-nistp256-sha256-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-1.3.132.0.26 { description "Enumeration for the 'gss-nistp256-sha256-1.3.132.0.26' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-1.3.132.0.27 { description "Enumeration for the 'gss-nistp256-sha256-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-1.3.132.0.16 { description "Enumeration for the 'gss-nistp256-sha256-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 17 September 2024 [Page 131] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum gss-nistp256-sha256-1.3.132.0.36 { description "Enumeration for the 'gss-nistp256-sha256-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-1.3.132.0.37 { description "Enumeration for the 'gss-nistp256-sha256-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp256-sha256-1.3.132.0.38 { description "Enumeration for the 'gss-nistp256-sha256-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-nistp256 { description "Enumeration for the 'gss-nistp384-sha384-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-nistp384 { description "Enumeration for the 'gss-nistp384-sha384-nistp384' algorithm."; reference "RFC 8732: Watsen Expires 17 September 2024 [Page 132] Internet-Draft Groupings for SSH Clients and Servers March 2024 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-nistp521 { description "Enumeration for the 'gss-nistp384-sha384-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.3.132.0.1 { description "Enumeration for the 'gss-nistp384-sha384-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- nistp384-sha384-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.3.132.0.33 { description "Enumeration for the 'gss-nistp384-sha384-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.3.132.0.26 { description "Enumeration for the 'gss-nistp384-sha384-1.3.132.0.26' algorithm."; Watsen Expires 17 September 2024 [Page 133] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.3.132.0.27 { description "Enumeration for the 'gss-nistp384-sha384-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.3.132.0.16 { description "Enumeration for the 'gss-nistp384-sha384-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.3.132.0.36 { description "Enumeration for the 'gss-nistp384-sha384-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.3.132.0.37 { description "Enumeration for the 'gss-nistp384-sha384-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp384-sha384-1.3.132.0.38 { description Watsen Expires 17 September 2024 [Page 134] Internet-Draft Groupings for SSH Clients and Servers March 2024 "Enumeration for the 'gss-nistp384-sha384-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-nistp256 { description "Enumeration for the 'gss-nistp521-sha512-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-nistp384 { description "Enumeration for the 'gss-nistp521-sha512-nistp384' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-nistp521 { description "Enumeration for the 'gss-nistp521-sha512-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-1.3.132.0.1 { description "Enumeration for the 'gss-nistp521-sha512-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 17 September 2024 [Page 135] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum gss-nistp521-sha512-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- nistp521-sha512-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-1.3.132.0.33 { description "Enumeration for the 'gss-nistp521-sha512-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-1.3.132.0.26 { description "Enumeration for the 'gss-nistp521-sha512-1.3.132.0.26' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-1.3.132.0.27 { description "Enumeration for the 'gss-nistp521-sha512-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-1.3.132.0.16 { description "Enumeration for the 'gss-nistp521-sha512-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 17 September 2024 [Page 136] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum gss-nistp521-sha512-1.3.132.0.36 { description "Enumeration for the 'gss-nistp521-sha512-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-1.3.132.0.37 { description "Enumeration for the 'gss-nistp521-sha512-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-nistp521-sha512-1.3.132.0.38 { description "Enumeration for the 'gss-nistp521-sha512-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-nistp256 { description "Enumeration for the 'gss-curve25519-sha256-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-nistp384 { description "Enumeration for the 'gss-curve25519-sha256-nistp384' algorithm."; reference "RFC 8732: Watsen Expires 17 September 2024 [Page 137] Internet-Draft Groupings for SSH Clients and Servers March 2024 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-nistp521 { description "Enumeration for the 'gss-curve25519-sha256-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.3.132.0.1 { description "Enumeration for the 'gss-curve25519-sha256-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- curve25519-sha256-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.3.132.0.33 { description "Enumeration for the 'gss-curve25519-sha256-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.3.132.0.26 { description "Enumeration for the 'gss-curve25519-sha256-1.3.132.0.26' algorithm."; Watsen Expires 17 September 2024 [Page 138] Internet-Draft Groupings for SSH Clients and Servers March 2024 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.3.132.0.27 { description "Enumeration for the 'gss-curve25519-sha256-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.3.132.0.16 { description "Enumeration for the 'gss-curve25519-sha256-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.3.132.0.36 { description "Enumeration for the 'gss-curve25519-sha256-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.3.132.0.37 { description "Enumeration for the 'gss-curve25519-sha256-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve25519-sha256-1.3.132.0.38 { description Watsen Expires 17 September 2024 [Page 139] Internet-Draft Groupings for SSH Clients and Servers March 2024 "Enumeration for the 'gss-curve25519-sha256-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-nistp256 { description "Enumeration for the 'gss-curve448-sha512-nistp256' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-nistp384 { description "Enumeration for the 'gss-curve448-sha512-nistp384' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-nistp521 { description "Enumeration for the 'gss-curve448-sha512-nistp521' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-1.3.132.0.1 { description "Enumeration for the 'gss-curve448-sha512-1.3.132.0.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 17 September 2024 [Page 140] Internet-Draft Groupings for SSH Clients and Servers March 2024 enum gss-curve448-sha512-1.2.840.10045.3.1.1 { description "Enumeration for the 'gss- curve448-sha512-1.2.840.10045.3.1.1' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-1.3.132.0.33 { description "Enumeration for the 'gss-curve448-sha512-1.3.132.0.33' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-1.3.132.0.26 { description "Enumeration for the 'gss-curve448-sha512-1.3.132.0.26' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-1.3.132.0.27 { description "Enumeration for the 'gss-curve448-sha512-1.3.132.0.27' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-1.3.132.0.16 { description "Enumeration for the 'gss-curve448-sha512-1.3.132.0.16' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 17 September 2024 [Page 141] Internet-Draft Groupings for SSH Clients and Servers March 2024 } enum gss-curve448-sha512-1.3.132.0.36 { description "Enumeration for the 'gss-curve448-sha512-1.3.132.0.36' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-1.3.132.0.37 { description "Enumeration for the 'gss-curve448-sha512-1.3.132.0.37' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum gss-curve448-sha512-1.3.132.0.38 { description "Enumeration for the 'gss-curve448-sha512-1.3.132.0.38' algorithm."; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } enum curve25519-sha256 { description "Enumeration for the 'curve25519-sha256' algorithm."; reference "RFC 8731: Secure Shell (SSH) Key Exchange Method Using Curve25519 and Curve448"; } enum curve448-sha512 { description "Enumeration for the 'curve448-sha512' algorithm."; reference "RFC 8731: Secure Shell (SSH) Key Exchange Method Using Curve25519 and Curve448"; Watsen Expires 17 September 2024 [Page 142] Internet-Draft Groupings for SSH Clients and Servers March 2024 } } description "An enumeration for SSH key exchange algorithms."; } } Appendix B. Change Log B.1. 00 to 01 * Noted that '0.0.0.0' and '::' might have special meanings. * Renamed "keychain" to "keystore". B.2. 01 to 02 * Removed the groupings 'listening-ssh-client-grouping' and 'listening-ssh-server-grouping'. Now modules only contain the transport-independent groupings. * Simplified the "client-auth" part in the ietf-ssh-client module. It now inlines what it used to point to keystore for. * Added cipher suites for various algorithms into new 'ietf-ssh- common' module. B.3. 02 to 03 * Removed 'RESTRICTED' enum from 'password' leaf type. * Added a 'must' statement to container 'server-auth' asserting that at least one of the various auth mechanisms must be specified. * Fixed description statement for leaf 'trusted-ca-certs'. B.4. 03 to 04 * Change title to "YANG Groupings for SSH Clients and SSH Servers" * Added reference to RFC 6668 * Added RFC 8174 to Requirements Language Section. Watsen Expires 17 September 2024 [Page 143] Internet-Draft Groupings for SSH Clients and Servers March 2024 * Enhanced description statement for ietf-ssh-server's "trusted-ca- certs" leaf. * Added mandatory true to ietf-ssh-client's "client-auth" 'choice' statement. * Changed the YANG prefix for module ietf-ssh-common from 'sshcom' to 'sshcmn'. * Removed the compression algorithms as they are not commonly configurable in vendors' implementations. * Updating descriptions in transport-params-grouping and the servers's usage of it. * Now tree diagrams reference ietf-netmod-yang-tree-diagrams * Updated YANG to use typedefs around leafrefs to common keystore paths * Now inlines key and certificates (no longer a leafref to keystore) B.5. 04 to 05 * Merged changes from co-author. B.6. 05 to 06 * Updated to use trust anchors from trust-anchors draft (was keystore draft) * Now uses new keystore grouping enabling asymmetric key to be either locally defined or a reference to the keystore. B.7. 06 to 07 * factored the ssh-[client|server]-groupings into more reusable groupings. * added if-feature statements for the new "ssh-host-keys" and "x509-certificates" features defined in draft-ietf-netconf-trust- anchors. B.8. 07 to 08 * Added a number of compatibility matrices to Section 5 (thanks Frank!) Watsen Expires 17 September 2024 [Page 144] Internet-Draft Groupings for SSH Clients and Servers March 2024 * Clarified that any configured "host-key-alg" values need to be compatible with the configured private key. B.9. 08 to 09 * Updated examples to reflect update to groupings defined in the keystore -09 draft. * Add SSH keepalives features and groupings. * Prefixed top-level SSH grouping nodes with 'ssh-' and support mashups. * Updated copyright date, boilerplate template, affiliation, and folding algorithm. B.10. 09 to 10 * Reformatted the YANG modules. B.11. 10 to 11 * Reformatted lines causing folding to occur. B.12. 11 to 12 * Collapsed all the inner groupings into the top-level grouping. * Added a top-level "demux container" inside the top-level grouping. * Added NACM statements and updated the Security Considerations section. * Added "presence" statements on the "keepalive" containers, as was needed to address a validation error that appeared after adding the "must" statements into the NETCONF/RESTCONF client/server modules. * Updated the boilerplate text in module-level "description" statement to match copyeditor convention. B.13. 12 to 13 * Removed the "demux containers", floating the nacm:default-deny- write to each descendant node, and adding a note to model designers regarding the potential need to add their own demux containers. Watsen Expires 17 September 2024 [Page 145] Internet-Draft Groupings for SSH Clients and Servers March 2024 * Fixed a couple references (section 2 --> section 3) * In the server model, replaced with and introduced 'inline-or-external' choice. B.14. 13 to 14 * Updated to reflect changes in trust-anchors drafts (e.g., s/trust- anchors/truststore/g + s/pinned.//) B.15. 14 to 15 * Updated examples to reflect ietf-crypto-types change (e.g., identities --> enumerations) * Updated "server-authentication" and "client-authentication" nodes from being a leaf of type "ts:host-keys-ref" or "ts:certificates- ref" to a container that uses "ts:inline-or-truststore-host-keys- grouping" or "ts:inline-or-truststore-certs-grouping". B.16. 15 to 16 * Removed unnecessary if-feature statements in the -client and -server modules. * Cleaned up some description statements in the -client and -server modules. * Fixed a canonical ordering issue in ietf-ssh-common detected by new pyang. B.17. 16 to 17 * Removed choice inline-or-external by removing the 'external' case and flattening the 'local' case and adding a "local-users- supported" feature. * Updated examples to include the "*-key-format" nodes. * Augmented-in "must" expressions ensuring that locally-defined public-key-format are "ct:ssh-public-key-format" (must expr for ref'ed keys are TBD). B.18. 17 to 18 * Removed leaf-list 'other' from ietf-ssh-server. * Removed unused 'external-client-auth-supported' feature. Watsen Expires 17 September 2024 [Page 146] Internet-Draft Groupings for SSH Clients and Servers March 2024 * Added features client-auth-password, client-auth-hostbased, and client-auth-none. * Renamed 'host-key' to 'public-key' for when refering to 'publickey' based auth. * Added new feature-protected 'hostbased' and 'none' to the 'user' node's config. * Added new feature-protected 'hostbased' and 'none' to the 'client- identity' node's config. * Updated examples to reflect new "bag" addition to truststore. * Refined truststore/keystore groupings to ensure the key formats "must" be particular values. * Switched to using truststore's new "public-key" bag (instead of separate "ssh-public-key" and "raw-public-key" bags. * Updated client/server examples to cover ALL cases (local/ref x cert/raw-key/psk). B.19. 18 to 19 * Updated the "keepalives" containers to address Michal Vasko's request to align with RFC 8071. * Removed algorithm-mapping tables from the "SSH Common Model" section * Removed 'algorithm' node from examples. * Added feature "userauth-publickey" * Removed "choice auth-type", as auth-types are not exclusive. * Renamed both "client-certs" and "server-certs" to "ee-certs" * Switch "must" to assert the public-key-format is "subject-public- key-info-format" when certificates are used. * Added a "Note to Reviewers" note to first page. B.20. 19 to 20 * Added a "must 'public-key or password or hostbased or none or certificate'" statement to the "user" node in ietf-ssh-client Watsen Expires 17 September 2024 [Page 147] Internet-Draft Groupings for SSH Clients and Servers March 2024 * Expanded "Data Model Overview section(s) [remove "wall" of tree diagrams]. * Moved the "ietf-ssh-common" module section to proceed the other two module sections. * Updated the Security Considerations section. B.21. 20 to 21 * Updated examples to reflect new "cleartext-" prefix in the crypto- types draft. B.22. 21 to 22 * Cleaned up the SSH-client examples (i.e., removing FIXMEs) * Fixed issues found by the SecDir review of the "keystore" draft. * Updated the "ietf-ssh-client" module to use the new "password- grouping" grouping from the "crypto-types" module. B.23. 22 to 23 * Addressed comments raised by YANG Doctor in the ct/ts/ks drafts. B.24. 23 to 24 * Removed the 'supported-authentication-methods' from {grouping ssh- server-grouping}/client-authentication. * Added XML-comment above examples explaining the reason for the unexepected top-most element's presence. * Added RFC-references to various 'feature' statements. * Renamed "credentials" to "authentication methods" * Renamed "client-auth-*" to "userauth-*" * Renamed "client-identity-*" to "userauth-*" * Fixed nits found by YANG Doctor reviews. * Aligned modules with `pyang -f` formatting. * Added a 'Contributors' section. Watsen Expires 17 September 2024 [Page 148] Internet-Draft Groupings for SSH Clients and Servers March 2024 B.25. 24 to 25 * Moved algorithms in ietf-ssh-common (plus more) to IANA-maintained modules * Added "config false" lists for algorithms supported by the server. * Renamed "{ietf-ssh-client}userauth-*" to "client-ident-*" * Renamed "{ietf-ssh-server}userauth-*" to "local-user-auth-*" * Fixed issues found during YANG Doctor review. * Fixed issues found during Secdir review. B.26. 25 to 26 * Replaced "base64encodedvalue==" with "BASE64VALUE=" in examples. * Minor editorial nits B.27. 26 to 27 * Fixed up the 'WG Web' and 'WG List' lines in YANG module(s) * Fixed up copyright (i.e., s/Simplified/Revised/) in YANG module(s) * Created identityref-based typedefs for each of the four IANA alg identity bases. * Added ietf-ssh-common:generate-asymmetric-key-pair() RPC for discussion. B.28. 27 to 28 * Fixed example to not have line-returns around "identity" values. * Fixed examples to not include "xmlns:algs". * Added an example for the "generate-asymmetric-key-pair" RPC. B.29. 28 to 29 * Updated modules to IANA-maintained modules in Appendix A to 2022-06-16. B.30. 29 to 30 Watsen Expires 17 September 2024 [Page 149] Internet-Draft Groupings for SSH Clients and Servers March 2024 * Fixed 'must' expressions. * Added missing 'revision' statement. B.31. 30 to 31 * Updated per Shepherd reviews impacting the suite of drafts. B.32. 31 to 32 * Updated per Shepherd reviews impacting the suite of drafts. B.33. 32 to 33 * Updated per Tom Petch review. * Updated Intro to clarify what "generic" means. * Added RPC-reply for 'generate-asymmetric-key-pair' example. * Added references to RFC 4251 and FIPS 186-6. * Added "if-feature ct:encrypted-private-keys" for "case cleartext". B.34. 33 to 34 * Addresses AD review comments. * Added note to Editor to fix line foldings. * Introduction now more clearly identifies the "ietf-" and "iana-" modules defined. * Clarified that the modules, when implemented, do not define any protocol-accessible nodes. * Clarified that IANA may deprecate and/or obsolete identities over time. * Added Security Consideration for the "generate-asymmetric-key- pair" RPC. * Added Security Considerations text to also look a SC-section from imported modules. * Fixed private-key "must" expressions to not require public-key nodes to be present. Watsen Expires 17 September 2024 [Page 150] Internet-Draft Groupings for SSH Clients and Servers March 2024 * Renamed leaf from "bits" to "num-bits". * Renamed leaf from "hide" to "hidden". * Added container "private-key-encoding" to wrap existing choice. * Removed "public-key-format" and "public-key" nodes from examples. B.35. 34 to 35 * Addresses AD review by Rob Wilton. B.36. 35 to 36 * Addresses 1st-round of IESG reviews. B.37. 36 to 38 * Addresses issues found in OpsDir review of the ssh-client-server draft. * Replaced identities with enums in the IANA modules. * Updated per Elwyn Davies' Gen-ART review. * Updated Introduction to read more like the Abstract * Add refs to where the 'operational' and 'system' datastores are defined. * Updated Editor-notes to NOT remove the script (just remove the initial IANA modules) * Renamed Security Considerations section s/Template for/ Considerations for/ * s/defines/presents/ in a few places. * Renamed script from 'gen-identities.py' to 'gen-yang-modules.py' * Removed the removeInRFC="true" attribute in Appendix sections B.38. 38 to 39 * Address IESG review comments. B.39. 39 to 40 Watsen Expires 17 September 2024 [Page 151] Internet-Draft Groupings for SSH Clients and Servers March 2024 * Updated to reflect comments from Paul Wouters. * Fixed the "generate-asymmetric-key-pair" RPC to return the location to where hidden keys are created. Acknowledgements The authors would like to thank the following for lively discussions on list and in the halls (ordered by first name): Alan Luchuk, Andy Bierman, Balázs Kovács, Barry Leiba, Benoit Claise, Bert Wijnen, David Lamparter, Elwyn Davies, Gary Wu, Jürgen Schönwälder, Ladislav Lhotka, Liang Xia, Martin Björklund, Martin Thomson, Mehmet Ersue, Michal Vaško, Murray Kucherawy, Paul Wouters, Per Andersson, Phil Shafer, Qin Wun, Radek Krejci, Rob Wilton, Roman Danyliw, Russ Housley, Sean Turner, Tom Petch, Thomas Martin, and Warren Kumari. Contributors Special acknowledgement goes to Gary Wu for his work on the "ietf- ssh-common" module. Author's Address Kent Watsen Watsen Networks Email: kent+ietf@watsen.net Watsen Expires 17 September 2024 [Page 152]