NETCONF Working Group K. Watsen Internet-Draft Watsen Networks Intended status: Standards Track 17 April 2023 Expires: 19 October 2023 YANG Groupings for SSH Clients and SSH Servers draft-ietf-netconf-ssh-client-server-33 Abstract This document defines three YANG 1.1 modules: the first defines features and groupings common to both SSH clients and SSH servers, the second defines a grouping for a generic SSH client, and the third defines a grouping for a generic SSH server. 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 Artwork in this document contains placeholder values for the date of publication of this draft. Please apply the following replacement: * 2023-04-17 --> the publication date of this draft Watsen Expires 19 October 2023 [Page 1] Internet-Draft Groupings for SSH Clients and Servers April 2023 The "Relation to other RFCs" section Section 1.1 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 1.1 contains a self- reference to this draft, along with a corresponding Informative Reference in the Appendix. The following Appendix section is to be removed prior to publication: * 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. 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 19 October 2023. Copyright Notice Copyright (c) 2023 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 Watsen Expires 19 October 2023 [Page 2] Internet-Draft Groupings for SSH Clients and Servers April 2023 1.1. Relation to other RFCs . . . . . . . . . . . . . . . . . 5 1.2. Specification Language . . . . . . . . . . . . . . . . . 7 1.3. Adherence to the NMDA . . . . . . . . . . . . . . . . . . 7 1.4. Conventions . . . . . . . . . . . . . . . . . . . . . . . 7 2. The "ietf-ssh-common" Module . . . . . . . . . . . . . . . . 7 2.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 7 2.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 11 2.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 13 3. The "ietf-ssh-client" Module . . . . . . . . . . . . . . . . 19 3.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 19 3.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 21 3.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 25 4. The "ietf-ssh-server" Module . . . . . . . . . . . . . . . . 32 4.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 33 4.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 35 4.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 39 5. Security Considerations . . . . . . . . . . . . . . . . . . . 48 5.1. The "iana-ssh-key-exchange-algs" Module . . . . . . . . . 48 5.2. The "iana-ssh-encryption-algs" Module . . . . . . . . . . 48 5.3. The "iana-ssh-mac-algs" Module . . . . . . . . . . . . . 49 5.4. The "iana-ssh-public-key-algs" Module . . . . . . . . . . 50 5.5. The "ietf-ssh-common" YANG Module . . . . . . . . . . . . 50 5.6. The "ietf-ssh-client" YANG Module . . . . . . . . . . . . 51 5.7. The "ietf-ssh-server" YANG Module . . . . . . . . . . . . 52 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 52 6.1. The "IETF XML" Registry . . . . . . . . . . . . . . . . . 52 6.2. The "YANG Module Names" Registry . . . . . . . . . . . . 53 6.3. The "iana-ssh-encryption-algs" Module . . . . . . . . . . 54 6.4. The "iana-ssh-mac-algs" Module . . . . . . . . . . . . . 55 6.5. The "iana-ssh-public-key-algs" Module . . . . . . . . . . 55 6.6. The "iana-ssh-key-exchange-algs" Module . . . . . . . . . 56 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 56 7.1. Normative References . . . . . . . . . . . . . . . . . . 56 7.2. Informative References . . . . . . . . . . . . . . . . . 59 Appendix A. YANG Modules for IANA . . . . . . . . . . . . . . . 62 A.1. Initial Module for the "Encryption Algorithm Names" Registry . . . . . . . . . . . . . . . . . . . . . . . . 62 A.1.1. Data Model Overview . . . . . . . . . . . . . . . . . 62 A.1.2. Example Usage . . . . . . . . . . . . . . . . . . . . 63 A.1.3. YANG Module . . . . . . . . . . . . . . . . . . . . . 63 A.2. Initial Module for the "MAC Algorithm Names" Registry . . 72 A.2.1. Data Model Overview . . . . . . . . . . . . . . . . . 72 A.2.2. Example Usage . . . . . . . . . . . . . . . . . . . . 73 A.2.3. YANG Module . . . . . . . . . . . . . . . . . . . . . 73 A.3. Initial Module for the "Public Key Algorithm Names" Registry . . . . . . . . . . . . . . . . . . . . . . . . 77 A.3.1. Data Model Overview . . . . . . . . . . . . . . . . . 77 A.3.2. Example Usage . . . . . . . . . . . . . . . . . . . . 78 Watsen Expires 19 October 2023 [Page 3] Internet-Draft Groupings for SSH Clients and Servers April 2023 A.3.3. YANG Module . . . . . . . . . . . . . . . . . . . . . 78 A.4. Initial Module for the "Key Exchange Method Names" Registry . . . . . . . . . . . . . . . . . . . . . . . . 88 A.4.1. Data Model Overview . . . . . . . . . . . . . . . . . 88 A.4.2. Example Usage . . . . . . . . . . . . . . . . . . . . 89 A.4.3. YANG Module . . . . . . . . . . . . . . . . . . . . . 89 Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 136 B.1. 00 to 01 . . . . . . . . . . . . . . . . . . . . . . . . 136 B.2. 01 to 02 . . . . . . . . . . . . . . . . . . . . . . . . 136 B.3. 02 to 03 . . . . . . . . . . . . . . . . . . . . . . . . 136 B.4. 03 to 04 . . . . . . . . . . . . . . . . . . . . . . . . 136 B.5. 04 to 05 . . . . . . . . . . . . . . . . . . . . . . . . 137 B.6. 05 to 06 . . . . . . . . . . . . . . . . . . . . . . . . 137 B.7. 06 to 07 . . . . . . . . . . . . . . . . . . . . . . . . 137 B.8. 07 to 08 . . . . . . . . . . . . . . . . . . . . . . . . 137 B.9. 08 to 09 . . . . . . . . . . . . . . . . . . . . . . . . 138 B.10. 09 to 10 . . . . . . . . . . . . . . . . . . . . . . . . 138 B.11. 10 to 11 . . . . . . . . . . . . . . . . . . . . . . . . 138 B.12. 11 to 12 . . . . . . . . . . . . . . . . . . . . . . . . 138 B.13. 12 to 13 . . . . . . . . . . . . . . . . . . . . . . . . 138 B.14. 13 to 14 . . . . . . . . . . . . . . . . . . . . . . . . 139 B.15. 14 to 15 . . . . . . . . . . . . . . . . . . . . . . . . 139 B.16. 15 to 16 . . . . . . . . . . . . . . . . . . . . . . . . 139 B.17. 16 to 17 . . . . . . . . . . . . . . . . . . . . . . . . 139 B.18. 17 to 18 . . . . . . . . . . . . . . . . . . . . . . . . 139 B.19. 18 to 19 . . . . . . . . . . . . . . . . . . . . . . . . 140 B.20. 19 to 20 . . . . . . . . . . . . . . . . . . . . . . . . 140 B.21. 20 to 21 . . . . . . . . . . . . . . . . . . . . . . . . 141 B.22. 21 to 22 . . . . . . . . . . . . . . . . . . . . . . . . 141 B.23. 22 to 23 . . . . . . . . . . . . . . . . . . . . . . . . 141 B.24. 23 to 24 . . . . . . . . . . . . . . . . . . . . . . . . 141 B.25. 24 to 25 . . . . . . . . . . . . . . . . . . . . . . . . 142 B.26. 25 to 26 . . . . . . . . . . . . . . . . . . . . . . . . 142 B.27. 26 to 27 . . . . . . . . . . . . . . . . . . . . . . . . 142 B.28. 27 to 28 . . . . . . . . . . . . . . . . . . . . . . . . 142 B.29. 28 to 29 . . . . . . . . . . . . . . . . . . . . . . . . 142 B.30. 29 to 30 . . . . . . . . . . . . . . . . . . . . . . . . 143 B.31. 30 to 31 . . . . . . . . . . . . . . . . . . . . . . . . 143 B.32. 31 to 32 . . . . . . . . . . . . . . . . . . . . . . . . 143 B.33. 32 to 33 . . . . . . . . . . . . . . . . . . . . . . . . 143 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 143 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 143 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 143 Watsen Expires 19 October 2023 [Page 4] Internet-Draft Groupings for SSH Clients and Servers April 2023 1. Introduction This document defines three YANG 1.1 [RFC7950] modules: the first defines features and groupings common to both SSH clients and SSH servers, the second defines a grouping for a generic SSH client, and the third defines a grouping for a generic SSH server. It is intended that these groupings will be used by applications using the SSH protocol [RFC4252], [RFC4253], and [RFC4254]. For instance, these groupings could be used to help define the data model for an OpenSSH [OPENSSH] server or a NETCONF over SSH [RFC6242] based server. The word "generic" in the previous paragraph should be interpreted as "least common denominator" more so than "complete." Basic SSH protocol support is afforded by these modules, leaving configuration of advance features (e.g., multiple channels) to augmentations made by consuming modules. This design decision may be revisted after sufficient experience with these modules. The client and server YANG modules in this document 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 use groupings defined in [I-D.ietf-netconf-keystore] enabling keys to be either inlined or a reference to globally configured values. The modules defined in this document optionally support [RFC6187] enabling X.509v3 certificate based host keys and public keys. 1.1. 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, enable the configuration of both the clients and servers of both the NETCONF [RFC6241] and RESTCONF [RFC8040] protocols. The normative dependency relationship between the various RFCs in this collection is presented in the below diagram. The labels in the diagram represent the primary purpose provided by each RFC. URLs for each RFC are provided below the diagram. Watsen Expires 19 October 2023 [Page 5] Internet-Draft Groupings for SSH Clients and Servers April 2023 crypto-types ^ ^ / \ / \ truststore keystore ^ ^ ^ ^ | +---------+ | | | | | | | +------------+ | tcp-client-server | / | | ^ ^ ssh-client-server | | | | ^ tls-client-server | | | ^ ^ http-client-server | | | | | ^ | | | +-----+ +---------+ | | | | | | | | +-----------|--------|--------------+ | | | | | | | | +-----------+ | | | | | | | | | | | | | | | | | netconf-client-server restconf-client-server +======================+===========================================+ |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 to RFC Mapping Watsen Expires 19 October 2023 [Page 6] Internet-Draft Groupings for SSH Clients and Servers April 2023 1.2. 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. 1.3. 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 . 1.4. Conventions Various examples used in this document use a placeholder value for binary data that has been base64 encoded (e.g., "BASE64VALUE="). This placeholder value is used as real base64 encoded structures are often many lines long and hence distracting to the example being presented. 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: Watsen Expires 19 October 2023 [Page 7] Internet-Draft Groupings for SSH Clients and Servers April 2023 Features: +-- ssh-x509-certs +-- transport-params +-- public-key-generation The diagram above uses syntax that is similar to but not defined in [RFC8340]. 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: grouping transport-params-grouping: +-- host-key | +-- host-key-alg* identityref +-- key-exchange | +-- key-exchange-alg* identityref +-- encryption | +-- encryption-alg* identityref +-- mac +-- mac-alg* identityref 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 19 October 2023 [Page 8] Internet-Draft Groupings for SSH Clients and Servers April 2023 module: ietf-ssh-common rpcs: +---x generate-public-key {public-key-generation}? +---w input | +---w algorithm sshpka:public-key-algorithm-ref | +---w bits? uint16 | +---w (private-key-encoding) | +--:(cleartext) {ct:encrypted-private-keys}? | | +---w cleartext? empty | +--:(encrypt) {ct:encrypted-private-keys}? | | +---w encrypt-with | | +---w ks:encrypted-by-choice-grouping | +--:(hide) {ct:hidden-private-keys}? | +---w hide? empty +--ro output +---u ct:asymmetric-key-pair-grouping The following tree diagram [RFC8340] lists all the protocol- accessible nodes defined in the "ietf-ssh-common" module, with all "grouping" statements expanded, enabling the module's full structure to be seen: Watsen Expires 19 October 2023 [Page 9] Internet-Draft Groupings for SSH Clients and Servers April 2023 =============== NOTE: '\' line wrapping per RFC 8792 ================ module: ietf-ssh-common rpcs: +---x generate-public-key {public-key-generation}? +---w input | +---w algorithm sshpka:public-key-algorithm-ref | +---w bits? uint16 | +---w (private-key-encoding) | +--:(cleartext) {ct:encrypted-private-keys}? | | +---w cleartext? empty | +--:(encrypt) {ct:encrypted-private-keys}? | | +---w encrypt-with | | +---w (encrypted-by-choice) | | +--:(symmetric-key-ref) | | | {central-keystore-supported,symmetric\ -keys}? | | | +---w symmetric-key-ref? | | | ks:symmetric-key-ref | | +--:(asymmetric-key-ref) | | {central-keystore-supported,asymmetri\ c-keys}? | | +---w asymmetric-key-ref? | | ks:asymmetric-key-ref | +--:(hide) {ct:hidden-private-keys}? | +---w hide? empty +--ro output +--ro public-key-format identityref +--ro public-key binary +--ro private-key-format? identityref +--ro (private-key-type) +--:(cleartext-private-key) {cleartext-private-keys}? | +--ro cleartext-private-key? binary +--:(hidden-private-key) {hidden-private-keys}? | +--ro hidden-private-key? empty +--:(encrypted-private-key) {encrypted-private-keys}? +--ro encrypted-private-key +--ro encrypted-by +--ro encrypted-value-format identityref +--ro encrypted-value binary Comments: * Protocol-accessible nodes are those nodes that are accessible when the module is "implemented", as described in Section 5.6.5 of [RFC7950]. Watsen Expires 19 October 2023 [Page 10] Internet-Draft Groupings for SSH Clients and Servers April 2023 * The protocol-accessible nodes for the "ietf-ssh-common" module are limited to the RPC "generate-public-key", which is additionally constrained by the feature "public-key-generation". * The "encrypted-by-choice-grouping" grouping is discussed in Section 2.1.3.1 of [I-D.ietf-netconf-keystore]. * The "asymmetric-key-pair-grouping" grouping is discussed in Section 2.1.4.5 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. Watsen Expires 19 October 2023 [Page 11] Internet-Draft Groupings for SSH Clients and Servers April 2023 =============== NOTE: '\' line wrapping per RFC 8792 ================ sshpka:x509v3-rsa2048-sha256 sshpka:ssh-rsa sshkea:diffie-hellman-group-exchange-sha256 sshea:aes256-ctr sshea:aes192-ctr sshea:aes128-ctr sshea:aes256-cbc sshea:aes192-cbc sshea:aes128-cbc sshma:hmac-sha2-256 sshma:hmac-sha2-512 The following example illustrates the "generate-public-key" RPC. REQUEST Watsen Expires 19 October 2023 [Page 12] Internet-Draft Groupings for SSH Clients and Servers April 2023 =============== NOTE: '\' line wrapping per RFC 8792 ================ sshpka: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@2023-04-17.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; reference Watsen Expires 19 October 2023 [Page 13] Internet-Draft Groupings for SSH Clients and Servers April 2023 "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) 2023 IETF Trust and the persons identified as authors of the code. All rights reserved. Watsen Expires 19 October 2023 [Page 14] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 2023-04-17 { 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 public-key-generation { description "Indicates that the server implements the 'generate-public-key' RPC."; } // Groupings Watsen Expires 19 October 2023 [Page 15] Internet-Draft Groupings for SSH Clients and Servers April 2023 grouping transport-params-grouping { description "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 identityref { base sshpka:public-key-alg-base; } 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 identityref { base sshkea:key-exchange-alg-base; } 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 identityref { base sshea:encryption-alg-base; } Watsen Expires 19 October 2023 [Page 16] Internet-Draft Groupings for SSH Clients and Servers April 2023 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."; } } container mac { description "Parameters regarding message authentication code (MAC)."; leaf-list mac-alg { type identityref { base sshma:mac-alg-base; } 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 rpc generate-public-key { if-feature "public-key-generation"; description "Requests the device to generate an public key using the specified key algorithm."; input { leaf algorithm { type sshpka:public-key-algorithm-ref; mandatory true; description "The algorithm to be used when generating the key."; } leaf bits { type uint16; description "Specifies the number of bits in the key to create. For RSA keys, the minimum size is 1024 bits and Watsen Expires 19 October 2023 [Page 17] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 '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 the 'bits' value, if specified, will be ignored."; reference "FIPS 186-6: Digital Signature Standard (DSS)"; } choice private-key-encoding { mandatory true; description "A choice amongst optional private key handling."; case cleartext { if-feature "ct:encrypted-private-keys"; leaf cleartext { type empty; description "Indicates that the private key is to be returned as a cleartext value."; } } case encrypt { if-feature "ct:encrypted-private-keys"; container encrypt-with { description "Indicates that the key is to be encrypted using the specified symmetric or asymmetric key."; uses ks:encrypted-by-choice-grouping; } } case hide { if-feature "ct:hidden-private-keys"; leaf hide { 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."; } } Watsen Expires 19 October 2023 [Page 18] Internet-Draft Groupings for SSH Clients and Servers April 2023 } } output { uses ct:asymmetric-key-pair-grouping; } } // end generate-public-key } 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: 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]. 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. Watsen Expires 19 October 2023 [Page 19] Internet-Draft Groupings for SSH Clients and Servers April 2023 3.1.2.1. The "ssh-client-grouping" Grouping The following tree diagram [RFC8340] illustrates the "ssh-client- grouping" grouping: =============== 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. Watsen Expires 19 October 2023 [Page 20] Internet-Draft Groupings for SSH Clients and Servers April 2023 * 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): - 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 2.1.3.2 of [I-D.ietf-netconf-trust-anchors]. - The "inline-or-truststore-certs-grouping" grouping is discussed in Section 2.1.3.1 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. 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 of [I-D.ietf-netconf-trust-anchors] and Section 3.2 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 ================ Watsen Expires 19 October 2023 [Page 21] Internet-Draft Groupings for SSH Clients and Servers April 2023 foobar ct:ssh-public-key-format BASE64VALUE= 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= Watsen Expires 19 October 2023 [Page 22] Internet-Draft Groupings for SSH Clients and Servers April 2023 My Application #2 BASE64VALUE= 30 3 The following configuration example uses keystore-references for the client identity and truststore-references for server authentication: from the keystore: Watsen Expires 19 October 2023 [Page 23] Internet-Draft Groupings for SSH Clients and Servers April 2023 =============== 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 19 October 2023 [Page 24] Internet-Draft Groupings for SSH Clients and Servers April 2023 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@2023-04-17.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 19 October 2023 [Page 25] Internet-Draft Groupings for SSH Clients and Servers April 2023 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) 2023 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 2023-04-17 { 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. Watsen Expires 19 October 2023 [Page 26] Internet-Draft Groupings for SSH Clients and Servers April 2023 The 'publickey' authentication type is required by RFC 4252, but common implementations enable 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."; 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 19 October 2023 [Page 27] Internet-Draft Groupings for SSH Clients and Servers April 2023 '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 'derived-from-or-self(public-key-format,' + ' "ct:ssh-public-key-format")'; } refine "inline-or-keystore/keystore/keystore-reference" { must 'derived-from-or-self(deref(.)/../ks:public-key-' + 'format, "ct:ssh-public-key-format")'; } } } container password { if-feature "client-ident-password"; presence "Indicates that password-based authentication has been Watsen Expires 19 October 2023 [Page 28] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 'derived-from-or-self(public-key-format,' + ' "ct:ssh-public-key-format")'; } refine "inline-or-keystore/keystore/keystore-reference" { must '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."; description "A locally-defined or referenced certificate to be used for client identification."; reference Watsen Expires 19 October 2023 [Page 29] Internet-Draft Groupings for SSH Clients and Servers April 2023 "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 'derived-from-or-self(public-key-format,' + ' "ct:subject-public-key-info-format")'; } refine "inline-or-keystore/keystore/keystore-reference" + "/asymmetric-key" { must '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")'; } refine "inline-or-truststore/truststore/truststore-reference" { must 'not(deref(.)/../ts:public-key/ts:public-key-' + 'format[not(derived-from-or-self(., "ct:ssh-' + 'public-key-format"))])'; } Watsen Expires 19 October 2023 [Page 30] Internet-Draft Groupings for SSH Clients and Servers April 2023 } } 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 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."; Watsen Expires 19 October 2023 [Page 31] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 } 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. Watsen Expires 19 October 2023 [Page 32] Internet-Draft Groupings for SSH Clients and Servers April 2023 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]. 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 19 October 2023 [Page 33] Internet-Draft Groupings for SSH Clients and Servers April 2023 =============== 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? ianach:crypt-hash | | | {local-user-auth-password}? | | +-- 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 19 October 2023 [Page 34] Internet-Draft Groupings for SSH Clients and Servers April 2023 * 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 2.1.3.2 of [I-D.ietf-netconf-trust-anchors]. - The "inline-or-truststore-certs-grouping" grouping is discussed in Section 2.1.3.1 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. 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 of [I-D.ietf-netconf-trust-anchors] and Section 3.2 of [I-D.ietf-netconf-keystore]. The following configuration example uses inline-definitions for the server identity and client authentication: =============== NOTE: '\' line wrapping per RFC 8792 ================ my-pubkey-based-host-key ct:ssh-public-key-format BASE64VALUE= ct:rsa-private-key-format BASE64VALUE= my-cert-based-host-key ct:subject-public-key-info-format BASE64VALUE= ct:rsa-private-key-format BASE64VALUE= BASE64VALUE= mary $0$secret Mary-Key-1 ct:ssh-public-key-format BASE64VALUE= Watsen Expires 19 October 2023 [Page 36] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 keystore-references for the server identity and truststore-references for client authentication: from the keystore: Watsen Expires 19 October 2023 [Page 37] Internet-Draft Groupings for SSH Clients and Servers April 2023 =============== 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 $0$secret SSH Public Keys for Application A trusted-client-ca-certs trusted-client-ee-certs Watsen Expires 19 October 2023 [Page 38] Internet-Draft Groupings for SSH Clients and Servers April 2023 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@2023-04-17.yang" module ietf-ssh-server { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-ssh-server"; prefix sshs; 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"; } 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"; Watsen Expires 19 October 2023 [Page 39] Internet-Draft Groupings for SSH Clients and Servers April 2023 } 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) 2023 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 2023-04-17 { description "Initial version"; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } Watsen Expires 19 October 2023 [Page 40] Internet-Draft Groupings for SSH Clients and Servers April 2023 // 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 enable 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"; } 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"; } Watsen Expires 19 October 2023 [Page 41] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 "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; Watsen Expires 19 October 2023 [Page 42] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 'derived-from-or-self(public-key-format,' + ' "ct:ssh-public-key-format")'; } refine "inline-or-keystore/keystore/" + "keystore-reference" { must '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" { must 'derived-from-or-self(public-key-format,' + ' "ct:subject-public-key-info-format")'; } refine "inline-or-keystore/keystore/keystore-reference" + "/asymmetric-key" { must 'derived-from-or-self(deref(.)/../ks:public-key-' + 'format, "ct:subject-public-key-info-format")'; } } } Watsen Expires 19 October 2023 [Page 43] Internet-Draft Groupings for SSH Clients and Servers April 2023 } } } // 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."; 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 Watsen Expires 19 October 2023 [Page 44] Internet-Draft Groupings for SSH Clients and Servers April 2023 "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/truststore/truststore-" + "reference" { must 'not(deref(.)/../ts:public-key/ts:public-key-' + 'format[not(derived-from-or-self(., "ct:ssh-' + 'public-key-format"))])'; } } } leaf password { if-feature "local-user-auth-password"; type ianach:crypt-hash; description "The password for this user."; } 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/truststore/truststore-" Watsen Expires 19 October 2023 [Page 45] Internet-Draft Groupings for SSH Clients and Servers April 2023 + "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."; } } } 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 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"; Watsen Expires 19 October 2023 [Page 46] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 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 Watsen Expires 19 October 2023 [Page 47] Internet-Draft Groupings for SSH Clients and Servers April 2023 no longer alive."; } } } // grouping ssh-server-grouping } 5. Security Considerations 5.1. The "iana-ssh-key-exchange-algs" Module 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 identities, for a public IANA- maintained registry, and a single protocol-accessible read-only node for the subset of those identities supported by a server. YANG identities are not security-sensitive, as they are statically defined in the publicly-accessible YANG module. The protocol-accessible read-only node for the algorithms supported by a server is mildly sensitive, but not to the extent that special NACM annotations are needed to prevent read-access to regular authenticated administrators. 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. The "iana-ssh-encryption-algs" Module 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. Watsen Expires 19 October 2023 [Page 48] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 identities, for a public IANA- maintained registry, and a single protocol-accessible read-only node for the subset of those identities supported by a server. YANG identities are not security-sensitive, as they are statically defined in the publicly-accessible YANG module. The protocol-accessible read-only node for the algorithms supported by a server is mildly sensitive, but not to the extent that special NACM annotations are needed to prevent read-access to regular authenticated administrators. This module does not define any writable-nodes, RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 5.3. The "iana-ssh-mac-algs" Module 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 identities, for a public IANA- maintained registry, and a single protocol-accessible read-only node for the subset of those identities supported by a server. YANG identities are not security-sensitive, as they are statically defined in the publicly-accessible YANG module. The protocol-accessible read-only node for the algorithms supported by a server is mildly sensitive, but not to the extent that special NACM annotations are needed to prevent read-access to regular authenticated administrators. 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 19 October 2023 [Page 49] Internet-Draft Groupings for SSH Clients and Servers April 2023 5.4. The "iana-ssh-public-key-algs" Module 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 identities, for a public IANA- maintained registry, and a single protocol-accessible read-only node for the subset of those identities supported by a server. YANG identities are not security-sensitive, as they are statically defined in the publicly-accessible YANG module. The protocol-accessible read-only node for the algorithms supported by a server is mildly sensitive, but not to the extent that special NACM annotations are needed to prevent read-access to regular authenticated administrators. 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. The "ietf-ssh-common" YANG Module 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. Since this module only define groupings, these considerations are primarily for the designers of other modules that use these groupings. 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. Watsen Expires 19 October 2023 [Page 50] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 5.6. The "ietf-ssh-client" YANG Module 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. Since this module only define groupings, these considerations are primarily for the designers of other modules that use these groupings. 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. Please be aware that this module uses the "key" and "private-key" nodes from the "ietf-crypto-types" module [I-D.ietf-netconf-crypto-types], where said nodes have the NACM extension "default-deny-all" set, thus preventing unrestricted read- access to the cleartext key values. 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. Watsen Expires 19 October 2023 [Page 51] Internet-Draft Groupings for SSH Clients and Servers April 2023 This module does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 5.7. The "ietf-ssh-server" YANG Module 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. Since this module only define groupings, these considerations are primarily for the designers of other modules that use these groupings. 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. Please be aware that this module uses the "key" and "private-key" nodes from the "ietf-crypto-types" module [I-D.ietf-netconf-crypto-types], where said nodes have the NACM extension "default-deny-all" set, thus preventing unrestricted read- access to the cleartext key values. 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 19 October 2023 [Page 52] Internet-Draft Groupings for SSH Clients and Servers April 2023 URI: urn:ietf:params:xml:ns:yang:iana-ssh-key-exchange-algs Registrant Contact: IANA XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:iana-ssh-encryption-algs Registrant Contact: IANA XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:iana-ssh-mac-algs Registrant Contact: IANA XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:iana-ssh-public-key-algs Registrant Contact: IANA 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 19 October 2023 [Page 53] Internet-Draft Groupings for SSH Clients and Servers April 2023 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. The "iana-ssh-encryption-algs" Module IANA is requested to maintain a YANG module called "iana-ssh- encryption-algs" that shadows the "Encryption Algorithm Names" sub- registry of the "Secure Shell (SSH) Protocol Parameters" registry [IANA-ENC-ALGS]. This registry defines a YANG identity for each encryption algorithm, and a "base" identity from which all of the other identities are derived. Identities are chosen over enumerations for extensibility reasons. An initial version of this module can be found in Appendix A.1 Watsen Expires 19 October 2023 [Page 54] Internet-Draft Groupings for SSH Clients and Servers April 2023 * Please note that this module was created on June 16th, 2022, and that additional entries may have been added in the interim before this document's publication. If this is that case, IANA may either publish just an updated module containing the new entries, or publish the initial module that is immediately followed by a "revision" containing the additional algorithm names. 6.4. The "iana-ssh-mac-algs" Module IANA is requested to maintain a YANG module called "iana-ssh-mac- algs" that shadows the "MAC Algorithm Names" sub-registry of the "Secure Shell (SSH) Protocol Parameters" registry [IANA-MAC-ALGS]. This registry defines a YANG identity for each MAC algorithm, and a "base" identity from which all of the other identities are derived. Identities are chosen over enumerations for extensibility reasons. An initial version of this module can be found in Appendix A.2. * Please note that this module was created on June 16th, 2022, and that additional entries may have been added in the interim before this document's publication. If this is that case, IANA may either publish just an updated module containing the new entries, or publish the initial module that is immediately followed by a "revision" containing the additional algorithm names. 6.5. The "iana-ssh-public-key-algs" Module IANA is requested to maintain a YANG module called "iana-ssh-public- key-algs" that shadows the "Public Key Algorithm Names" sub-registry of the "Secure Shell (SSH) Protocol Parameters" registry [IANA-PUBKEY-ALGS]. This registry defines a YANG identity for each public key algorithm, and a "base" identity from which all of the other identities are derived. Identities are chosen over enumerations for extensibility reasons. Registry entries for which the '*All values beginning with the specified string and not containing "@".' note applies MUST be expanded so that there is a distinct YANG identity for each enumeration. An initial version of this module can be found in Appendix A.3. * Please note that this module was created on June 16th, 2022, and that additional entries may have been added in the interim before this document's publication. If this is that case, IANA may Watsen Expires 19 October 2023 [Page 55] Internet-Draft Groupings for SSH Clients and Servers April 2023 either publish just an updated module containing the new entries, or publish the initial module that is immediately followed by a "revision" containing the additional algorithm names. 6.6. The "iana-ssh-key-exchange-algs" Module IANA is requested to maintain a YANG module called "iana-ssh-key- exchange-algs" that shadows the "Key Exchange Method Names" sub- registry of the "Secure Shell (SSH) Protocol Parameters" registry [IANA-KEYEX-ALGS]. This registry defines a YANG identity for each key exchange algorithm, and a "base" identity from which all of the other identities are derived. Identities are chosen over enumerations for extensibility reasons. Registry entries for which the '*All values beginning with the specified string and not containing "@".' note applies MUST be expanded so that there is a distinct YANG identity for each enumeration. An initial version of this module can be found in Appendix A.4. * Please note that this module was created on June 16th, 2022, and that additional entries may have been added in the interim before this document's publication. If this is that case, IANA may either publish just an updated module containing the new entries, or publish the initial module that is immediately followed by a "revision" containing the additional algorithm names. 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-26, 12 December 2022, . [I-D.ietf-netconf-keystore] Watsen, K., "A YANG Data Model for a Keystore", Work in Progress, Internet-Draft, draft-ietf-netconf-keystore-27, 12 December 2022, . Watsen Expires 19 October 2023 [Page 56] Internet-Draft Groupings for SSH Clients and Servers April 2023 [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-20, 12 December 2022, . [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, . [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, . Watsen Expires 19 October 2023 [Page 57] Internet-Draft Groupings for SSH Clients and Servers April 2023 [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, . [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, . Watsen Expires 19 October 2023 [Page 58] Internet-Draft Groupings for SSH Clients and Servers April 2023 [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 [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-12, 12 December 2022, . Watsen Expires 19 October 2023 [Page 59] Internet-Draft Groupings for SSH Clients and Servers April 2023 [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-28, 12 December 2022, . [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-28, 12 December 2022, . [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-32, 12 December 2022, . [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-15, 12 December 2022, . [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-32, 12 December 2022, . [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", . Watsen Expires 19 October 2023 [Page 60] Internet-Draft Groupings for SSH Clients and Servers April 2023 [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", . [OPENSSH] Project, T. O., "OpenSSH", . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [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, . Watsen Expires 19 October 2023 [Page 61] Internet-Draft Groupings for SSH Clients and Servers April 2023 Appendix A. YANG Modules for IANA The modules contained in this section were generated by scripts using the contents of the associated sub-registry as they existed on June 16th, 2022. A.1. Initial Module for the "Encryption Algorithm Names" Registry A.1.1. Data Model Overview This section provides an overview of the "iana-ssh-encryption-algs" module in terms of its identities and protocol-accessible nodes. A.1.1.1. Identities The following diagram lists the base "identity" statements defined in the module, of which there is just one, and illustrates that all the derived identity statements are generated from the associated IANA- maintained registry [IANA-ENC-ALGS]. Identities: +-- encryption-alg-base +-- The diagram above uses syntax that is similar to but not defined in [RFC8340]. A.1.1.2. Typedefs The following diagram illustrates the "typedef" statements defined in the "iana-ssh-encryption-algs" module: Typedefs: identityref +-- encryption-algorithm-ref The diagram above uses syntax that is similar to but not defined in [RFC8340]. Comments: * The typedef defined in the "iana-ssh-encryption-algs" module extends the "identityref" type defined in [RFC7950]. A.1.1.3. Protocol-accessible Nodes The following tree diagram [RFC8340] lists all the protocol- accessible nodes defined in the "iana-ssh-encryption-algs" module: Watsen Expires 19 October 2023 [Page 62] Internet-Draft Groupings for SSH Clients and Servers April 2023 module: iana-ssh-encryption-algs +--ro supported-algorithms +--ro supported-algorithm* encryption-algorithm-ref Comments: * Protocol-accessible nodes are those nodes that are accessible when the module is "implemented", as described in Section 5.6.5 of [RFC7950]. A.1.2. Example Usage The following example illustrates operational state data indicating the SSH encryption algorithms supported by the server: sshea:aes256-ctr sshea:aes256-cbc sshea:twofish256-cbc sshea:serpent256-cbc sshea:arcfour256 sshea:serpent256-ctr sshea:aead-aes-256-gcm A.1.3. YANG Module Following are the complete contents to the initial IANA-maintained YANG module. Please note that the date "2022-06-16" reflects the day on which the extraction occurred. This YANG module has normative references to [FIPS 46-3], [RFC4253], [RFC4344], [RFC5647], and [RFC8758]. file "iana-ssh-encryption-algs@2022-06-16.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 Watsen Expires 19 October 2023 [Page 63] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 identities for the encryption algorithms defined in the 'Encryption Algorithm Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained by IANA. Copyright (c) 2022 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."; revision 2022-06-16 { description "Reflects contents of the encryption algorithms registry on June 16, 2022."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } // Typedefs typedef encryption-algorithm-ref { type identityref { base "encryption-alg-base"; } description "A reference to a SSH encryption algorithm identifier."; } // Identities identity encryption-alg-base { Watsen Expires 19 October 2023 [Page 64] Internet-Draft Groupings for SSH Clients and Servers April 2023 description "Base identity used to identify encryption algorithms."; } identity triple-des-cbc { // YANG IDs cannot begin with a number base encryption-alg-base; description "3DES-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity blowfish-cbc { base encryption-alg-base; description "BLOWFISH-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity twofish256-cbc { base encryption-alg-base; description "TWOFISH256-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity twofish-cbc { base encryption-alg-base; description "TWOFISH-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity twofish192-cbc { base encryption-alg-base; description "TWOFISH192-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } Watsen Expires 19 October 2023 [Page 65] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity twofish128-cbc { base encryption-alg-base; description "TWOFISH128-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity aes256-cbc { base encryption-alg-base; description "AES256-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity aes192-cbc { base encryption-alg-base; description "AES192-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity aes128-cbc { base encryption-alg-base; status deprecated; description "AES128-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity serpent256-cbc { base encryption-alg-base; description "SERPENT256-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity serpent192-cbc { base encryption-alg-base; Watsen Expires 19 October 2023 [Page 66] Internet-Draft Groupings for SSH Clients and Servers April 2023 description "SERPENT192-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity serpent128-cbc { base encryption-alg-base; description "SERPENT128-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity arcfour { base encryption-alg-base; status obsolete; description "ARCFOUR"; reference "RFC 8758: Deprecating RC4 in Secure Shell (SSH)"; } identity idea-cbc { base encryption-alg-base; description "IDEA-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity cast128-cbc { base encryption-alg-base; description "CAST128-CBC"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity none { base encryption-alg-base; description "NONE"; Watsen Expires 19 October 2023 [Page 67] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity des-cbc { base encryption-alg-base; status obsolete; description "DES-CBC"; reference "FIPS 46-3: Data Encryption Standard (DES)"; } identity arcfour128 { base encryption-alg-base; status obsolete; description "ARCFOUR128"; reference "RFC 8758: Deprecating RC4 in Secure Shell (SSH)"; } identity arcfour256 { base encryption-alg-base; status obsolete; description "ARCFOUR256"; reference "RFC 8758: Deprecating RC4 in Secure Shell (SSH)"; } identity aes128-ctr { base encryption-alg-base; status deprecated; description "AES128-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity aes192-ctr { base encryption-alg-base; description Watsen Expires 19 October 2023 [Page 68] Internet-Draft Groupings for SSH Clients and Servers April 2023 "AES192-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity aes256-ctr { base encryption-alg-base; description "AES256-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity triple-des-ctr { // YANG IDs cannot begin with a number base encryption-alg-base; description "3DES-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity blowfish-ctr { base encryption-alg-base; description "BLOWFISH-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity twofish128-ctr { base encryption-alg-base; description "TWOFISH128-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity twofish192-ctr { base encryption-alg-base; description "TWOFISH192-CTR"; reference "RFC 4344: Watsen Expires 19 October 2023 [Page 69] Internet-Draft Groupings for SSH Clients and Servers April 2023 The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity twofish256-ctr { base encryption-alg-base; description "TWOFISH256-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity serpent128-ctr { base encryption-alg-base; description "SERPENT128-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity serpent192-ctr { base encryption-alg-base; description "SERPENT192-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity serpent256-ctr { base encryption-alg-base; description "SERPENT256-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity idea-ctr { base encryption-alg-base; description "IDEA-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } Watsen Expires 19 October 2023 [Page 70] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity cast128-ctr { base encryption-alg-base; description "CAST128-CTR"; reference "RFC 4344: The Secure Shell (SSH) Transport Layer Encryption Modes"; } identity aead-aes-128-gcm { base encryption-alg-base; description "AEAD_AES_128_GCM"; reference "RFC 5647: AES Galois Counter Mode for the Secure Shell Transport Layer Protocol"; } identity aead-aes-256-gcm { base encryption-alg-base; description "AEAD_AES_256_GCM"; reference "RFC 5647: AES Galois Counter Mode for the Secure Shell Transport Layer Protocol"; } // Protocol-accessible Nodes container supported-algorithms { config false; description "A container for a list of encryption algorithms supported by the server."; leaf-list supported-algorithm { type encryption-algorithm-ref; description "A encryption algorithm supported by the server."; } } } Watsen Expires 19 October 2023 [Page 71] Internet-Draft Groupings for SSH Clients and Servers April 2023 A.2. Initial Module for the "MAC Algorithm Names" Registry A.2.1. Data Model Overview This section provides an overview of the "iana-ssh-mac-algs" module in terms of its identities and protocol-accessible nodes. A.2.1.1. Identities The following diagram lists the base "identity" statements defined in the module, of which there is just one, and illustrates that all the derived identity statements are generated from the associated IANA- maintained registry [IANA-MAC-ALGS]. Identities: +-- mac-alg-base +-- The diagram above uses syntax that is similar to but not defined in [RFC8340]. A.2.1.2. Typedefs The following diagram illustrates the "typedef" statements defined in the "iana-ssh-mac-algs" module: Typedefs: identityref +-- mac-algorithm-ref The diagram above uses syntax that is similar to but not defined in [RFC8340]. Comments: * The typedef defined in the "iana-ssh-mac-algs" module extends the "identityref" type defined in [RFC7950]. A.2.1.3. Protocol-accessible Nodes The following tree diagram [RFC8340] lists all the protocol- accessible nodes defined in the "iana-ssh-mac-algs" module: module: iana-ssh-mac-algs +--ro supported-algorithms +--ro supported-algorithm* mac-algorithm-ref Comments: Watsen Expires 19 October 2023 [Page 72] Internet-Draft Groupings for SSH Clients and Servers April 2023 * Protocol-accessible nodes are those nodes that are accessible when the module is "implemented", as described in Section 5.6.5 of [RFC7950]. A.2.2. Example Usage The following example illustrates operational state data indicating the SSH MAC algorithms supported by the server: sshma:hmac-sha2-256 sshma:hmac-sha2-512 sshma:aead-aes-256-gcm A.2.3. YANG Module Following are the complete contents to the initial IANA-maintained YANG module. Please note that the date "2022-06-16" reflects the day on which the extraction occurred. This YANG module has normative references [RFC4253], [RFC5647], and [RFC6668]. file "iana-ssh-mac-algs@2022-06-16.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 identities for the MAC algorithms defined in the 'MAC Algorithm Names' sub-registry of the 'Secure Shell (SSH) Protocol Parameters' registry maintained Watsen Expires 19 October 2023 [Page 73] Internet-Draft Groupings for SSH Clients and Servers April 2023 by IANA. Copyright (c) 2022 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."; revision 2022-06-16 { description "Reflects contents of the MAC algorithms registry on June 16, 2022."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } // Typedefs typedef mac-algorithm-ref { type identityref { base "mac-alg-base"; } description "A reference to a SSH mac algorithm identifier."; } // Identities identity mac-alg-base { description "Base identity used to identify message authentication code (MAC) algorithms."; } identity hmac-sha1 { base mac-alg-base; description "HMAC-SHA1"; reference Watsen Expires 19 October 2023 [Page 74] Internet-Draft Groupings for SSH Clients and Servers April 2023 "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity hmac-sha1-96 { base mac-alg-base; description "HMAC-SHA1-96"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity hmac-md5 { base mac-alg-base; description "HMAC-MD5"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity hmac-md5-96 { base mac-alg-base; description "HMAC-MD5-96"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity none { base mac-alg-base; description "NONE"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity aead-aes-128-gcm { base mac-alg-base; description "AEAD_AES_128_GCM"; reference "RFC 5647: AES Galois Counter Mode for the Secure Shell Transport Layer Protocol"; Watsen Expires 19 October 2023 [Page 75] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity aead-aes-256-gcm { base mac-alg-base; description "AEAD_AES_256_GCM"; reference "RFC 5647: AES Galois Counter Mode for the Secure Shell Transport Layer Protocol"; } identity hmac-sha2-256 { base mac-alg-base; description "HMAC-SHA2-256"; reference "RFC 6668: SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport Layer Protocol"; } identity hmac-sha2-512 { base mac-alg-base; description "HMAC-SHA2-512"; reference "RFC 6668: SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport Layer Protocol"; } // Protocol-accessible Nodes container supported-algorithms { config false; description "A container for a list of MAC algorithms supported by the server."; leaf-list supported-algorithm { type mac-algorithm-ref; description "A MAC algorithm supported by the server."; } } } Watsen Expires 19 October 2023 [Page 76] Internet-Draft Groupings for SSH Clients and Servers April 2023 A.3. Initial Module for the "Public Key Algorithm Names" Registry A.3.1. Data Model Overview This section provides an overview of the "iana-ssh-public-key-algs" module in terms of its identities and protocol-accessible nodes. A.3.1.1. Identities The following diagram lists the base "identity" statements defined in the module, of which there is just one, and illustrates that all the derived identity statements are generated from the associated IANA- maintained registry [IANA-PUBKEY-ALGS]. Identities: +-- public-key-alg-base +-- The diagram above uses syntax that is similar to but not defined in [RFC8340]. A.3.1.2. Typedefs The following diagram illustrates the "typedef" statements defined in the "iana-ssh-public-key-algs" module: Typedefs: identityref +-- public-key-algorithm-ref The diagram above uses syntax that is similar to but not defined in [RFC8340]. Comments: * The typedef defined in the "iana-ssh-public-key-algs" module extends the "identityref" type defined in [RFC7950]. A.3.1.3. Protocol-accessible Nodes The following tree diagram [RFC8340] lists all the protocol- accessible nodes defined in the "iana-ssh-public-key-algs" module: module: iana-ssh-public-key-algs +--ro supported-algorithms +--ro supported-algorithm* public-key-algorithm-ref Watsen Expires 19 October 2023 [Page 77] Internet-Draft Groupings for SSH Clients and Servers April 2023 Comments: * Protocol-accessible nodes are those nodes that are accessible when the module is "implemented", as described in Section 5.6.5 of [RFC7950]. A.3.2. Example Usage The following example illustrates operational state data indicating the SSH public key algorithms supported by the server: =============== NOTE: '\' line wrapping per RFC 8792 ================ sshpka:rsa-sha2-256 sshpka:rsa-sha2-512 sshpka:spki-sign-rsa sshpka:pgp-sign-dss sshpka:x509v3-rsa2048-sha256 sshpka:ecdsa-sha2-nistp256 sshpka:ecdsa-sha2-1.3.132.0.37 sshpka:ssh-ed25519 A.3.3. YANG Module Following are the complete contents to the initial IANA-maintained YANG module. Please note that the date "2022-06-16" reflects the day on which the extraction occurred. This YANG module has normative references [RFC4253], [RFC4462], [RFC5656], [RFC6187], [RFC8332], and [RFC8709]. file "iana-ssh-public-key-algs@2022-06-16.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)"; Watsen Expires 19 October 2023 [Page 78] Internet-Draft Groupings for SSH Clients and Servers April 2023 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 identities 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) 2022 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."; revision 2022-06-16 { description "Reflects contents of the public key algorithms registry on June 16, 2022."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } // Typedefs typedef public-key-algorithm-ref { type identityref { base "public-key-alg-base"; } description "A reference to a SSH public key algorithm identifier."; } // Identities Watsen Expires 19 October 2023 [Page 79] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity public-key-alg-base { description "Base identity used to identify public key algorithms."; } identity ssh-dss { base public-key-alg-base; description "SSH-DSS"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity ssh-rsa { base public-key-alg-base; description "SSH-RSA"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity rsa-sha2-256 { base public-key-alg-base; description "RSA-SHA2-256"; reference "RFC 8332: Use of RSA Keys with SHA-256 and SHA-512 in the Secure Shell (SSH) Protocol"; } identity rsa-sha2-512 { base public-key-alg-base; description "RSA-SHA2-512"; reference "RFC 8332: Use of RSA Keys with SHA-256 and SHA-512 in the Secure Shell (SSH) Protocol"; } identity spki-sign-rsa { base public-key-alg-base; description "SPKI-SIGN-RSA"; reference Watsen Expires 19 October 2023 [Page 80] Internet-Draft Groupings for SSH Clients and Servers April 2023 "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity spki-sign-dss { base public-key-alg-base; description "SPKI-SIGN-DSS"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity pgp-sign-rsa { base public-key-alg-base; description "PGP-SIGN-RSA"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity pgp-sign-dss { base public-key-alg-base; description "PGP-SIGN-DSS"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity null { base public-key-alg-base; description "NULL"; reference "RFC 4462: Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) Protocol"; } identity ecdsa-sha2-nistp256 { base public-key-alg-base; status deprecated; description "ECDSA-SHA2-NISTP256 (secp256r1)"; reference Watsen Expires 19 October 2023 [Page 81] Internet-Draft Groupings for SSH Clients and Servers April 2023 "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-nistp384 { base public-key-alg-base; description "ECDSA-SHA2-NISTP384 (secp384r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-nistp521 { base public-key-alg-base; description "ECDSA-SHA2-NISTP521 (secp521r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.3.132.0.1 { base public-key-alg-base; description "ECDSA-SHA2-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.2.840.10045.3.1.1 { base public-key-alg-base; description "ECDSA-SHA2-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.3.132.0.33 { base public-key-alg-base; description Watsen Expires 19 October 2023 [Page 82] Internet-Draft Groupings for SSH Clients and Servers April 2023 "ECDSA-SHA2-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.3.132.0.26 { base public-key-alg-base; description "ECDSA-SHA2-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.3.132.0.27 { base public-key-alg-base; description "ECDSA-SHA2-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.3.132.0.16 { base public-key-alg-base; description "ECDSA-SHA2-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.3.132.0.36 { base public-key-alg-base; description "ECDSA-SHA2-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.3.132.0.37 { Watsen Expires 19 October 2023 [Page 83] Internet-Draft Groupings for SSH Clients and Servers April 2023 base public-key-alg-base; description "ECDSA-SHA2-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdsa-sha2-1.3.132.0.38 { base public-key-alg-base; description "ECDSA-SHA2-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity x509v3-ssh-dss { base public-key-alg-base; description "X509V3-SSH-DSS"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ssh-rsa { base public-key-alg-base; description "X509V3-SSH-RSA"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-rsa2048-sha256 { base public-key-alg-base; status deprecated; description "X509V3-RSA2048-SHA256"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-nistp256 { Watsen Expires 19 October 2023 [Page 84] Internet-Draft Groupings for SSH Clients and Servers April 2023 base public-key-alg-base; description "X509V3-ECDSA-SHA2-NISTP256 (secp256r1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-nistp384 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-NISTP384 (secp384r1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-nistp521 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-NISTP521 (secp521r1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-1.3.132.0.1 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-1.2.840.10045.3.1.1 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-1.3.132.0.33 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.3.132.0.33 (nistp224, secp224r1)"; Watsen Expires 19 October 2023 [Page 85] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-1.3.132.0.26 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-1.3.132.0.27 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-1.3.132.0.16 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-1.3.132.0.36 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity x509v3-ecdsa-sha2-1.3.132.0.37 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; Watsen Expires 19 October 2023 [Page 86] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity x509v3-ecdsa-sha2-1.3.132.0.38 { base public-key-alg-base; description "X509V3-ECDSA-SHA2-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 6187: X.509v3 Certificates for Secure Shell Authentication"; } identity ssh-ed25519 { base public-key-alg-base; description "SSH-ED25519"; reference "RFC 8709: Ed25519 and Ed448 Public Key Algorithms for the Secure Shell (SSH) Protocol"; } identity ssh-ed448 { base public-key-alg-base; description "SSH-ED448"; reference "RFC 8709: Ed25519 and Ed448 Public Key Algorithms for the Secure Shell (SSH) Protocol"; } // Protocol-accessible Nodes container supported-algorithms { config false; description "A container for a list of public key algorithms supported by the server."; leaf-list supported-algorithm { type public-key-algorithm-ref; description "A public key algorithm supported by the server."; } } } Watsen Expires 19 October 2023 [Page 87] Internet-Draft Groupings for SSH Clients and Servers April 2023 A.4. Initial Module for the "Key Exchange Method Names" Registry A.4.1. Data Model Overview This section provides an overview of the "iana-ssh-key-exchange-algs" module in terms of its identities and protocol-accessible nodes. A.4.1.1. Identities The following diagram lists the base "identity" statements defined in the module, of which there is just one, and illustrates that all the derived identity statements are generated from the associated IANA- maintained registry [IANA-KEYEX-ALGS]. Identities: +-- key-exchange-alg-base +-- The diagram above uses syntax that is similar to but not defined in [RFC8340]. A.4.1.2. Typedefs The following diagram illustrates the "typedef" statements defined in the "iana-ssh-key-exchange-algs" module: Typedefs: identityref +-- key-exchange-algorithm-ref The diagram above uses syntax that is similar to but not defined in [RFC8340]. Comments: * The typedef defined in the "iana-ssh-key-exchange-algs" module extends the "identityref" type defined in [RFC7950]. A.4.1.3. Protocol-accessible Nodes The following tree diagram [RFC8340] lists all the protocol- accessible nodes defined in the "iana-ssh-key-exchange-algs" module: module: iana-ssh-key-exchange-algs +--ro supported-algorithms +--ro supported-algorithm* key-exchange-algorithm-ref Comments: Watsen Expires 19 October 2023 [Page 88] Internet-Draft Groupings for SSH Clients and Servers April 2023 * Protocol-accessible nodes are those nodes that are accessible when the module is "implemented", as described in Section 5.6.5 of [RFC7950]. A.4.2. Example Usage The following example illustrates operational state data indicating the SSH key exchange algorithms supported by the server: =============== NOTE: '\' line wrapping per RFC 8792 ================ sshkea:diffie-hellman-group-exchange-sha256 sshkea:ecdh-sha2-nistp256 sshkea:rsa2048-sha256 sshkea:gss-group1-sha1-curve25519-sha256 sshkea:gss-group14-sha1-nistp256 sshkea:gss-gex-sha1-nistp256 sshkea:gss-group14-sha256-1.2.840.10045.3.1.1\ sshkea:curve25519-sha256 A.4.3. YANG Module Following are the complete contents to the initial IANA-maintained YANG module. Please note that the date "2022-06-16" reflects the day on which the extraction occurred. This YANG module has normative references to [RFC4419], [RFC4432], [RFC5656], [RFC8268], [RFC8308], [RFC8731], [RFC8732]. file "iana-ssh-key-exchange-algs@2022-06-16.yang" 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 Watsen Expires 19 October 2023 [Page 89] Internet-Draft Groupings for SSH Clients and Servers April 2023 "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 identities 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) 2022 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."; revision 2022-06-16 { description "Reflects contents of the key exchange algorithms registry on June 16, 2022."; reference "RFC EEEE: YANG Groupings for SSH Clients and SSH Servers"; } // Typedefs typedef key-exchange-algorithm-ref { type identityref { base "key-exchange-alg-base"; } description "A reference to a SSH key exchange algorithm identifier."; } Watsen Expires 19 October 2023 [Page 90] Internet-Draft Groupings for SSH Clients and Servers April 2023 // Identities identity key-exchange-alg-base { description "Base identity used to identify key exchange algorithms."; } identity diffie-hellman-group-exchange-sha1 { base key-exchange-alg-base; status deprecated; description "DIFFIE-HELLMAN-GROUP-EXCHANGE-SHA1"; reference "RFC 4419: Diffie-Hellman Group Exchange for the Secure Shell (SSH) Transport Layer Protocol"; } identity diffie-hellman-group-exchange-sha256 { base key-exchange-alg-base; description "DIFFIE-HELLMAN-GROUP-EXCHANGE-SHA256"; reference "RFC 4419: Diffie-Hellman Group Exchange for the Secure Shell (SSH) Transport Layer Protocol"; } identity diffie-hellman-group1-sha1 { base key-exchange-alg-base; status deprecated; description "DIFFIE-HELLMAN-GROUP1-SHA1"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } identity diffie-hellman-group14-sha1 { base key-exchange-alg-base; status deprecated; description "DIFFIE-HELLMAN-GROUP14-SHA1"; reference "RFC 4253: The Secure Shell (SSH) Transport Layer Protocol"; } Watsen Expires 19 October 2023 [Page 91] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity diffie-hellman-group14-sha256 { base key-exchange-alg-base; status deprecated; description "DIFFIE-HELLMAN-GROUP14-SHA256"; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; } identity diffie-hellman-group15-sha512 { base key-exchange-alg-base; description "DIFFIE-HELLMAN-GROUP15-SHA512"; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; } identity diffie-hellman-group16-sha512 { base key-exchange-alg-base; description "DIFFIE-HELLMAN-GROUP16-SHA512"; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; } identity diffie-hellman-group17-sha512 { base key-exchange-alg-base; description "DIFFIE-HELLMAN-GROUP17-SHA512"; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"; } identity diffie-hellman-group18-sha512 { base key-exchange-alg-base; description "DIFFIE-HELLMAN-GROUP18-SHA512"; reference "RFC 8268: More Modular Exponentiation (MODP) Diffie-Hellman (DH) Watsen Expires 19 October 2023 [Page 92] Internet-Draft Groupings for SSH Clients and Servers April 2023 Key Exchange (KEX) Groups for Secure Shell (SSH)"; } identity ecdh-sha2-nistp256 { base key-exchange-alg-base; status deprecated; description "ECDH-SHA2-NISTP256 (secp256r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-nistp384 { base key-exchange-alg-base; description "ECDH-SHA2-NISTP384 (secp384r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-nistp521 { base key-exchange-alg-base; description "ECDH-SHA2-NISTP521 (secp521r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.3.132.0.1 { base key-exchange-alg-base; description "ECDH-SHA2-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "ECDH-SHA2-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; Watsen Expires 19 October 2023 [Page 93] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.3.132.0.33 { base key-exchange-alg-base; description "ECDH-SHA2-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.3.132.0.26 { base key-exchange-alg-base; description "ECDH-SHA2-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.3.132.0.27 { base key-exchange-alg-base; description "ECDH-SHA2-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.3.132.0.16 { base key-exchange-alg-base; description "ECDH-SHA2-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.3.132.0.36 { base key-exchange-alg-base; Watsen Expires 19 October 2023 [Page 94] Internet-Draft Groupings for SSH Clients and Servers April 2023 description "ECDH-SHA2-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.3.132.0.37 { base key-exchange-alg-base; description "ECDH-SHA2-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecdh-sha2-1.3.132.0.38 { base key-exchange-alg-base; description "ECDH-SHA2-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity ecmqv-sha2 { base key-exchange-alg-base; description "ECMQV-SHA2"; reference "RFC 5656: Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer"; } identity gss-group1-sha1-nistp256 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 19 October 2023 [Page 95] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity gss-group1-sha1-nistp384 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-nistp521 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.3.132.0.1 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.2.840.10045.3.1.1 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.3.132.0.33 { base key-exchange-alg-base; status deprecated; description Watsen Expires 19 October 2023 [Page 96] Internet-Draft Groupings for SSH Clients and Servers April 2023 "GSS-GROUP1-SHA1-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.3.132.0.26 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.3.132.0.27 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.3.132.0.16 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.3.132.0.36 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface Watsen Expires 19 October 2023 [Page 97] Internet-Draft Groupings for SSH Clients and Servers April 2023 (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.3.132.0.37 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-1.3.132.0.38 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-curve25519-sha256 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group1-sha1-curve448-sha512 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP1-SHA1-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-nistp256 { Watsen Expires 19 October 2023 [Page 98] Internet-Draft Groupings for SSH Clients and Servers April 2023 base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-nistp384 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-nistp521 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-1.3.132.0.1 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-1.2.840.10045.3.1.1 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; Watsen Expires 19 October 2023 [Page 99] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-1.3.132.0.33 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-1.3.132.0.26 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-1.3.132.0.27 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-1.3.132.0.16 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 19 October 2023 [Page 100] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity gss-group14-sha1-1.3.132.0.36 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-1.3.132.0.37 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-1.3.132.0.38 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-curve25519-sha256 { base key-exchange-alg-base; status deprecated; description "GSS-GROUP14-SHA1-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha1-curve448-sha512 { base key-exchange-alg-base; Watsen Expires 19 October 2023 [Page 101] Internet-Draft Groupings for SSH Clients and Servers April 2023 status deprecated; description "GSS-GROUP14-SHA1-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-nistp256 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-nistp384 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-nistp521 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-1.3.132.0.1 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.3.132.0.1 (nistk163, sect163k1)"; reference Watsen Expires 19 October 2023 [Page 102] Internet-Draft Groupings for SSH Clients and Servers April 2023 "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-1.2.840.10045.3.1.1 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-1.3.132.0.33 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-1.3.132.0.26 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-1.3.132.0.27 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 19 October 2023 [Page 103] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity gss-gex-sha1-1.3.132.0.16 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-1.3.132.0.36 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-1.3.132.0.37 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-1.3.132.0.38 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-curve25519-sha256 { base key-exchange-alg-base; status deprecated; description Watsen Expires 19 October 2023 [Page 104] Internet-Draft Groupings for SSH Clients and Servers April 2023 "GSS-GEX-SHA1-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-gex-sha1-curve448-sha512 { base key-exchange-alg-base; status deprecated; description "GSS-GEX-SHA1-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity rsa1024-sha1 { base key-exchange-alg-base; status obsolete; description "RSA1024-SHA1"; reference "RFC 4432: RSA Key Exchange for the Secure Shell (SSH) Transport Layer Protocol"; } identity rsa2048-sha256 { base key-exchange-alg-base; description "RSA2048-SHA256"; reference "RFC 4432: RSA Key Exchange for the Secure Shell (SSH) Transport Layer Protocol"; } identity ext-info-s { base key-exchange-alg-base; description "EXT-INFO-S"; reference "RFC 8308: Extension Negotiation in the Secure Shell (SSH) Protocol"; } Watsen Expires 19 October 2023 [Page 105] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity ext-info-c { base key-exchange-alg-base; description "EXT-INFO-C"; reference "RFC 8308: Extension Negotiation in the Secure Shell (SSH) Protocol"; } identity gss-group14-sha256-nistp256 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-nistp384 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-nistp521 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 19 October 2023 [Page 106] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity gss-group14-sha256-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 19 October 2023 [Page 107] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity gss-group14-sha256-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-curve25519-sha256 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group14-sha256-curve448-sha512 { base key-exchange-alg-base; description "GSS-GROUP14-SHA256-CURVE448-SHA512"; reference "RFC 8732: Watsen Expires 19 October 2023 [Page 108] Internet-Draft Groupings for SSH Clients and Servers April 2023 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-nistp256 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-nistp384 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-nistp521 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; Watsen Expires 19 October 2023 [Page 109] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.3.132.0.36 { base key-exchange-alg-base; Watsen Expires 19 October 2023 [Page 110] Internet-Draft Groupings for SSH Clients and Servers April 2023 description "GSS-GROUP15-SHA512-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-curve25519-sha256 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group15-sha512-curve448-sha512 { base key-exchange-alg-base; description "GSS-GROUP15-SHA512-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 19 October 2023 [Page 111] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity gss-group16-sha512-nistp256 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-nistp384 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-nistp521 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 19 October 2023 [Page 112] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity gss-group16-sha512-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Watsen Expires 19 October 2023 [Page 113] Internet-Draft Groupings for SSH Clients and Servers April 2023 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-curve25519-sha256 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group16-sha512-curve448-sha512 { base key-exchange-alg-base; description "GSS-GROUP16-SHA512-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-nistp256 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-NISTP256 (secp256r1)"; Watsen Expires 19 October 2023 [Page 114] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-nistp384 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-nistp521 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-1.3.132.0.33 { base key-exchange-alg-base; Watsen Expires 19 October 2023 [Page 115] Internet-Draft Groupings for SSH Clients and Servers April 2023 description "GSS-GROUP17-SHA512-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 19 October 2023 [Page 116] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity gss-group17-sha512-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-curve25519-sha256 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group17-sha512-curve448-sha512 { base key-exchange-alg-base; description "GSS-GROUP17-SHA512-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-nistp256 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 19 October 2023 [Page 117] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity gss-group18-sha512-nistp384 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-nistp521 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Watsen Expires 19 October 2023 [Page 118] Internet-Draft Groupings for SSH Clients and Servers April 2023 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.3.132.0.37 (nistb409, sect409r1)"; Watsen Expires 19 October 2023 [Page 119] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-curve25519-sha256 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-group18-sha512-curve448-sha512 { base key-exchange-alg-base; description "GSS-GROUP18-SHA512-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-nistp256 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-nistp384 { base key-exchange-alg-base; Watsen Expires 19 October 2023 [Page 120] Internet-Draft Groupings for SSH Clients and Servers April 2023 description "GSS-NISTP256-SHA256-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-nistp521 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 19 October 2023 [Page 121] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity gss-nistp256-sha256-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 19 October 2023 [Page 122] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity gss-nistp256-sha256-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-curve25519-sha256 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp256-sha256-curve448-sha512 { base key-exchange-alg-base; description "GSS-NISTP256-SHA256-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-nistp256 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-nistp384 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-NISTP384 (secp384r1)"; reference "RFC 8732: Watsen Expires 19 October 2023 [Page 123] Internet-Draft Groupings for SSH Clients and Servers April 2023 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-nistp521 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-1.3.132.0.26 (nistk233, sect233k1)"; Watsen Expires 19 October 2023 [Page 124] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-1.3.132.0.38 { base key-exchange-alg-base; Watsen Expires 19 October 2023 [Page 125] Internet-Draft Groupings for SSH Clients and Servers April 2023 description "GSS-NISTP384-SHA384-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-curve25519-sha256 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp384-sha384-curve448-sha512 { base key-exchange-alg-base; description "GSS-NISTP384-SHA384-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-nistp256 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-nistp384 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 19 October 2023 [Page 126] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity gss-nistp521-sha512-nistp521 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 19 October 2023 [Page 127] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity gss-nistp521-sha512-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Watsen Expires 19 October 2023 [Page 128] Internet-Draft Groupings for SSH Clients and Servers April 2023 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-curve25519-sha256 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-nistp521-sha512-curve448-sha512 { base key-exchange-alg-base; description "GSS-NISTP521-SHA512-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-nistp256 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-nistp384 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-nistp521 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-NISTP521 (secp521r1)"; Watsen Expires 19 October 2023 [Page 129] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.3.132.0.27 { Watsen Expires 19 October 2023 [Page 130] Internet-Draft Groupings for SSH Clients and Servers April 2023 base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } Watsen Expires 19 October 2023 [Page 131] Internet-Draft Groupings for SSH Clients and Servers April 2023 identity gss-curve25519-sha256-curve25519-sha256 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-CURVE25519-SHA256"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve25519-sha256-curve448-sha512 { base key-exchange-alg-base; description "GSS-CURVE25519-SHA256-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-nistp256 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-NISTP256 (secp256r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-nistp384 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-NISTP384 (secp384r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-nistp521 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-NISTP521 (secp521r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; Watsen Expires 19 October 2023 [Page 132] Internet-Draft Groupings for SSH Clients and Servers April 2023 } identity gss-curve448-sha512-1.3.132.0.1 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.3.132.0.1 (nistk163, sect163k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-1.2.840.10045.3.1.1 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.2.840.10045.3.1.1 (nistp192, secp192r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-1.3.132.0.33 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.3.132.0.33 (nistp224, secp224r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-1.3.132.0.26 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.3.132.0.26 (nistk233, sect233k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-1.3.132.0.27 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.3.132.0.27 (nistb233, sect233r1)"; reference "RFC 8732: Watsen Expires 19 October 2023 [Page 133] Internet-Draft Groupings for SSH Clients and Servers April 2023 Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-1.3.132.0.16 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.3.132.0.16 (nistk283, sect283k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-1.3.132.0.36 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.3.132.0.36 (nistk409, sect409k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-1.3.132.0.37 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.3.132.0.37 (nistb409, sect409r1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-1.3.132.0.38 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-1.3.132.0.38 (nistt571, sect571k1)"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-curve25519-sha256 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-CURVE25519-SHA256"; Watsen Expires 19 October 2023 [Page 134] Internet-Draft Groupings for SSH Clients and Servers April 2023 reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity gss-curve448-sha512-curve448-sha512 { base key-exchange-alg-base; description "GSS-CURVE448-SHA512-CURVE448-SHA512"; reference "RFC 8732: Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"; } identity curve25519-sha256 { base key-exchange-alg-base; description "CURVE25519-SHA256"; reference "RFC 8731: Secure Shell (SSH) Key Exchange Method Using Curve25519 and Curve448"; } identity curve448-sha512 { base key-exchange-alg-base; description "CURVE448-SHA512"; reference "RFC 8731: Secure Shell (SSH) Key Exchange Method Using Curve25519 and Curve448"; } // Protocol-accessible Nodes container supported-algorithms { config false; description "A container for a list of key exchange algorithms supported by the server."; leaf-list supported-algorithm { type key-exchange-algorithm-ref; description "A key exchange algorithm supported by the server."; } Watsen Expires 19 October 2023 [Page 135] Internet-Draft Groupings for SSH Clients and Servers April 2023 } } Appendix B. Change Log This section is to be removed before publishing as an RFC. 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. * Enhanced description statement for ietf-ssh-server's "trusted-ca- certs" leaf. Watsen Expires 19 October 2023 [Page 136] Internet-Draft Groupings for SSH Clients and Servers April 2023 * 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!) * Clarified that any configured "host-key-alg" values need to be compatible with the configured private key. Watsen Expires 19 October 2023 [Page 137] Internet-Draft Groupings for SSH Clients and Servers April 2023 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. * Fixed a couple references (section 2 --> section 3) Watsen Expires 19 October 2023 [Page 138] Internet-Draft Groupings for SSH Clients and Servers April 2023 * 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 19 October 2023 [Page 139] Internet-Draft Groupings for SSH Clients and Servers April 2023 * 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 19 October 2023 [Page 140] Internet-Draft Groupings for SSH Clients and Servers April 2023 * 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 19 October 2023 [Page 141] Internet-Draft Groupings for SSH Clients and Servers April 2023 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-public-key() 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-public-key" RPC. B.29. 28 to 29 * Updated modules to IANA-maintained modules in Appendix A to 2022-06-16. Watsen Expires 19 October 2023 [Page 142] Internet-Draft Groupings for SSH Clients and Servers April 2023 B.30. 29 to 30 * 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-public-key' example. * Added references to RFC 4251 and FIPS 186-6. * Added "if-feature ct:encrypted-private-keys" for "case cleartext". Acknowledgements The authors would like to thank for 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, Gary Wu, Juergen Schoenwaelder, Ladislav Lhotka, Liang Xia, Martin Björklund, Mehmet Ersue, Michal Vaško, Per Andersson, Phil Shafer, Radek Krejci, Sean Turner, Tom Petch. 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 19 October 2023 [Page 143]