NETCONF Working Group K. Watsen Internet-Draft Watsen Networks Intended status: Standards Track 24 May 2022 Expires: 25 November 2022 YANG Groupings for HTTP Clients and HTTP Servers draft-ietf-netconf-http-client-server-10 Abstract This document defines two YANG modules: the first defines a minimal grouping for configuring an HTTP client, and the second defines a minimal grouping for configuring an HTTP server. It is intended that these groupings will be used to help define the configuration for simple HTTP-based protocols (not for complete web servers or browsers). 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 (note: not all may be present): * AAAA --> the assigned RFC value for draft-ietf-netconf-crypto- types * DDDD --> the assigned RFC value for draft-ietf-netconf-tcp-client- server * FFFF --> the assigned RFC value for draft-ietf-netconf-tls-client- server * GGGG --> 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: * 2022-05-24 --> the publication date of this draft The following Appendix section is to be removed prior to publication: * Appendix A. Change Log Watsen Expires 25 November 2022 [Page 1] Internet-Draft Groupings for HTTP Clients and Servers May 2022 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 25 November 2022. Copyright Notice Copyright (c) 2022 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Relation to other RFCs . . . . . . . . . . . . . . . . . 3 1.2. Specification Language . . . . . . . . . . . . . . . . . 5 1.3. Adherence to the NMDA . . . . . . . . . . . . . . . . . . 5 1.4. Conventions . . . . . . . . . . . . . . . . . . . . . . . 5 2. The "ietf-http-client" Module . . . . . . . . . . . . . . . . 5 2.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 5 2.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 8 2.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 10 3. The "ietf-http-server" Module . . . . . . . . . . . . . . . . 16 3.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 16 3.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 18 3.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 19 4. Security Considerations . . . . . . . . . . . . . . . . . . . 24 4.1. The "ietf-http-client" YANG Module . . . . . . . . . . . 24 Watsen Expires 25 November 2022 [Page 2] Internet-Draft Groupings for HTTP Clients and Servers May 2022 4.2. The "ietf-http-server" YANG Module . . . . . . . . . . . 25 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 26 5.1. The "IETF XML" Registry . . . . . . . . . . . . . . . . . 26 5.2. The "YANG Module Names" Registry . . . . . . . . . . . . 26 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 26 6.1. Normative References . . . . . . . . . . . . . . . . . . 26 6.2. Informative References . . . . . . . . . . . . . . . . . 27 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 29 A.1. 00 to 01 . . . . . . . . . . . . . . . . . . . . . . . . 29 A.2. 01 to 02 . . . . . . . . . . . . . . . . . . . . . . . . 29 A.3. 02 to 03 . . . . . . . . . . . . . . . . . . . . . . . . 29 A.4. 03 to 04 . . . . . . . . . . . . . . . . . . . . . . . . 30 A.5. 04 to 05 . . . . . . . . . . . . . . . . . . . . . . . . 30 A.6. 05 to 06 . . . . . . . . . . . . . . . . . . . . . . . . 30 A.7. 06 to 07 . . . . . . . . . . . . . . . . . . . . . . . . 30 A.8. 07 to 08 . . . . . . . . . . . . . . . . . . . . . . . . 31 A.9. 08 to 09 . . . . . . . . . . . . . . . . . . . . . . . . 31 A.10. 09 to 10 . . . . . . . . . . . . . . . . . . . . . . . . 31 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 31 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 31 1. Introduction This document defines two YANG 1.1 [RFC7950] modules: the first defines a minimal grouping for configuring an HTTP client, and the second defines a minimal grouping for configuring an HTTP server. It is intended that these groupings will be used to help define the configuration for simple HTTP-based protocols (not for complete web servers or browsers). 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 the clients and servers of both the NETCONF [RFC6241] and RESTCONF [RFC8040] protocols. The modules have been defined in a modular fashion to enable their use by other efforts, some of which are known to be in progress at the time of this writing, with many more expected to be defined in time. The normative dependency relationship between the various RFCs in the collection is presented in the below diagram. The labels in the diagram represent the primary purpose provided by each RFC. Hyperlinks to each RFC are provided below the diagram. Watsen Expires 25 November 2022 [Page 3] Internet-Draft Groupings for HTTP Clients and Servers May 2022 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 25 November 2022 [Page 4] Internet-Draft Groupings for HTTP Clients and Servers May 2022 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-http-client" Module This section defines a YANG 1.1 module called "ietf-http-client". A high-level overview of the module is provided in Section 2.1. Examples illustrating the module's use are provided in Examples (Section 2.2). The YANG module itself is defined in Section 2.3. 2.1. Data Model Overview This section provides an overview of the "ietf-http-client" module in terms of its features and groupings. 2.1.1. Features The following diagram lists all the "feature" statements defined in the "ietf-http-client" module: Features: +-- proxy-connect +-- basic-auth +-- tcp-supported +-- tls-supported Watsen Expires 25 November 2022 [Page 5] Internet-Draft Groupings for HTTP Clients and Servers May 2022 | The diagram above uses syntax that is similar to but not | defined in [RFC8340]. 2.1.2. Groupings The "ietf-http-client" module defines the following "grouping" statements: * http-client-identity-grouping * http-client-grouping * http-client-stack-grouping Each of these groupings are presented in the following subsections. 2.1.2.1. The "http-client-identity-grouping" Grouping The following tree diagram [RFC8340] illustrates the "http-client- identity-grouping" grouping: grouping http-client-identity-grouping: +-- client-identity! +-- (auth-type) +--:(basic) +-- basic {basic-auth}? +-- user-id string +---u ct:password-grouping Comments: * This grouping exists because it is used three times by the "http- client-grouping" discussed in Section 2.1.2.2. * The "client-identity" node is a "presence" container so the mandatory descendant nodes do not imply that this node must be configured, as a client identity may be configured at protocol layers. * The "basic" authentication scheme is the only scheme defined by this module, albeit it must be enabled via the "basic-auth" feature (see Section 2.1.1). * Other authentication schemes MAY be augmented in as needed by the application. 2.1.2.2. The "http-client-grouping" Grouping The following tree diagram [RFC8340] illustrates the "http-client- grouping" grouping: Watsen Expires 25 November 2022 [Page 6] Internet-Draft Groupings for HTTP Clients and Servers May 2022 grouping http-client-grouping: +---u http-client-identity-grouping +-- proxy-connect! {proxy-connect}? +-- (proxy-type) +--:(http) | +-- http-proxy | +-- tcp-client-parameters | | +---u tcpc:tcp-client-grouping | +-- http-client-parameters | +---u http-client-identity-grouping +--:(https) +-- https-proxy +-- tcp-client-parameters | +---u tcpc:tcp-client-grouping +-- tls-client-parameters | +---u tlsc:tls-client-grouping +-- http-client-parameters +---u http-client-identity-grouping Comments: * The "http-client-grouping" defines the configuration for just "HTTP" part of a protocol stack. It does not, for instance, define any configuration for the "TCP" or "TLS" protocol layers (for that, see Section 2.1.2.3). * Beyond configuring the client's identity, via the "http-client- identity-grouping" grouping discussed in Section 2.1.2.1, this grouping defines support for HTTP-proxies, albeit it must be enabled via a "feature" statement. * The "proxy-connect" node is a "presence" container so the mandatory descendant nodes do not imply that this node must be configured, assuming the server supports the "proxy-connect" feature. * For the referenced grouping statement(s): - The "http-client-identity-grouping" grouping is discussed in Section 2.1.2.1. - The "tcp-client-grouping" grouping is discussed in Section 3.1.2.1 of [I-D.ietf-netconf-tcp-client-server]. - The "tls-client-grouping" grouping is discussed in Section 3.1.2.1 of [I-D.ietf-netconf-tls-client-server]. Watsen Expires 25 November 2022 [Page 7] Internet-Draft Groupings for HTTP Clients and Servers May 2022 2.1.2.3. The "http-client-stack-grouping" Grouping The following tree diagram [RFC8340] illustrates the "http-client- stack-grouping" grouping: grouping http-client-stack-grouping: +-- (transport) +--:(tcp) {tcp-supported}? | +-- tcp | +-- tcp-client-parameters | | +---u tcpc:tcp-client-grouping | +-- http-client-parameters | +---u http-client-grouping +--:(tls) {tls-supported}? +-- tls +-- tcp-client-parameters | +---u tcpc:tcp-client-grouping +-- tls-client-parameters | +---u tlsc:tls-client-grouping +-- http-client-parameters +---u http-client-grouping Comments: * The "http-client-stack-grouping" is a convenience grouping for downstream modules. It defines both the "HTTP" and "HTTPS" protocol stacks, with each option enabled by a "feature" statement for application control. * For the referenced grouping statement(s): - The "tcp-client-grouping" grouping is discussed in Section 3.1.2.1 of [I-D.ietf-netconf-tcp-client-server]. - The "tls-client-grouping" grouping is discussed in Section 3.1.2.1 of [I-D.ietf-netconf-tls-client-server]. - The "http-client-grouping" grouping is discussed in Section 2.1.2.2 in this document. 2.1.3. Protocol-accessible Nodes The "ietf-http-client" module defines only "grouping" statements that are used by other modules to instantiate protocol-accessible nodes. 2.2. Example Usage This section presents two examples showing the http-client-grouping populated with some data. Watsen Expires 25 November 2022 [Page 8] Internet-Draft Groupings for HTTP Clients and Servers May 2022 The following example illustrates an HTTP client connecting directly to an HTTP server. bob secret The following example illustrates the same client connecting through an HTTP proxy. This example is consistent with examples presented in Section 2.2 of [I-D.ietf-netconf-trust-anchors] and Section 2.2 of [I-D.ietf-netconf-keystore]. =============== NOTE: '\' line wrapping per RFC 8792 ================ bob secret corp-fw2.example.com 15 3 30 rsa-asymmetric-key ex-rsa-cert Watsen Expires 25 November 2022 [Page 9] Internet-Draft Groupings for HTTP Clients and Servers May 2022 trusted-server-ca-certs trusted-server-ee-certs local-app-1 secret 2.3. YANG Module This YANG module has normative references to [RFC6991]. file "ietf-http-client@2022-05-24.yang" module ietf-http-client { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-http-client"; prefix httpc; import ietf-netconf-acm { prefix nacm; reference "RFC 8341: Network Configuration Access Control Model"; } import ietf-crypto-types { prefix ct; reference "RFC AAAA: YANG Data Types and Groupings for Cryptography"; } Watsen Expires 25 November 2022 [Page 10] Internet-Draft Groupings for HTTP Clients and Servers May 2022 import ietf-tcp-client { prefix tcpc; reference "RFC DDDD: YANG Groupings for TCP Clients and TCP Servers"; } import ietf-tls-client { prefix tlsc; reference "RFC FFFF: YANG Groupings for TLS Clients and TLS 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 reusable groupings for HTTP clients that can be used as a basis for specific HTTP client instances. 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). This version of this YANG module is part of RFC GGGG (https://www.rfc-editor.org/info/rfcGGGG); 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 2022-05-24 { description "Initial version"; Watsen Expires 25 November 2022 [Page 11] Internet-Draft Groupings for HTTP Clients and Servers May 2022 reference "RFC GGGG: YANG Groupings for HTTP Clients and HTTP Servers"; } // Features feature proxy-connect { description "Proxy connection configuration is configurable for HTTP clients on the server implementing this feature."; } feature basic-auth { description "The 'basic-auth' feature indicates that the client may be configured to use the 'basic' HTTP authentication scheme."; reference "RFC 7617: The 'Basic' HTTP Authentication Scheme"; } feature tcp-supported { description "Indicates that the server supports HTTP/TCP."; } feature tls-supported { description "Indicates that the server supports HTTP/TLS."; } // Groupings grouping http-client-identity-grouping { description "A grouping to provide HTTP credentials used by the client to authenticate itself to the HTTP server."; container client-identity { nacm:default-deny-write; presence "Indicates that a client identity has been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "The identity the HTTP client should use when authenticating itself to the HTTP server."; choice auth-type { mandatory true; Watsen Expires 25 November 2022 [Page 12] Internet-Draft Groupings for HTTP Clients and Servers May 2022 description "A choice amongst available authentication types."; case basic { container basic { if-feature "basic-auth"; leaf user-id { type string; mandatory true; description "The user-id for the authenticating client."; } uses ct:password-grouping { description "The password for the authenticating client."; } description "The 'basic' HTTP scheme credentials."; reference "RFC 7617: The 'Basic' HTTP Authentication Scheme"; } } } } } // grouping http-client-identity-grouping grouping http-client-grouping { description "A reusable grouping for configuring a HTTP client. This grouping is expected to be used in conjunction with other configurations providing, e.g., the hostname or IP address and port number the client initiates connections to. Note that this grouping uses fairly typical descendant node names such that a stack 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 'http-client-parameters'). This model purposely does not do this itself so as to provide maximum flexibility to consuming models."; uses http-client-identity-grouping; container proxy-connect { nacm:default-deny-write; if-feature "proxy-connect"; Watsen Expires 25 November 2022 [Page 13] Internet-Draft Groupings for HTTP Clients and Servers May 2022 presence "Indicates that a proxy server connections have been configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "Configures the proxy server the HTTP-client is to connect thru."; choice proxy-type { mandatory true; description "Choice amongst proxy server types."; case http { container http-proxy { description "Container for HTTP Proxy (Web Proxy) server configuration parameters."; container tcp-client-parameters { description "A wrapper around the TCP parameters to avoid name collisions."; uses tcpc:tcp-client-grouping; } container http-client-parameters { description "A wrapper around the HTTP parameters to avoid name collisions."; uses http-client-identity-grouping; } } } case https { container https-proxy { description "Container for HTTPS Proxy (Secure Web Proxy) server configuration parameters."; container tcp-client-parameters { description "A wrapper around the TCP parameters to avoid name collisions."; uses tcpc:tcp-client-grouping; } container tls-client-parameters { description "A wrapper around the TLS parameters to avoid name collisions."; uses tlsc:tls-client-grouping; } Watsen Expires 25 November 2022 [Page 14] Internet-Draft Groupings for HTTP Clients and Servers May 2022 container http-client-parameters { description "A wrapper around the HTTP parameters to avoid name collisions."; uses http-client-identity-grouping; } } } } } } // grouping http-client-grouping grouping http-client-stack-grouping { description "A grouping that defines common HTTP-based protocol stacks."; choice transport { mandatory true; description "Choice amongst various transports type. TCP, with and without TLS are defined here, with 'feature' statements so that they may be disabled. Other transports MAY be augmented in as 'case' statements by future efforts."; case tcp { if-feature "tcp-supported"; container tcp { description "Container for TCP-based HTTP protocols."; container tcp-client-parameters { description "A wrapper around the TCP parameters to avoid name collisions."; uses tcpc:tcp-client-grouping; } container http-client-parameters { description "A wrapper around the HTTP parameters to avoid name collisions."; uses http-client-grouping; } } } case tls { if-feature "tls-supported"; container tls { description "Container for TLS-based HTTP protocols."; container tcp-client-parameters { description Watsen Expires 25 November 2022 [Page 15] Internet-Draft Groupings for HTTP Clients and Servers May 2022 "A wrapper around the TCP parameters to avoid name collisions."; uses tcpc:tcp-client-grouping; } container tls-client-parameters { description "A wrapper around the TLS parameters to avoid name collisions."; uses tlsc:tls-client-grouping; } container http-client-parameters { description "A wrapper around the HTTP parameters to avoid name collisions."; uses http-client-grouping; } } } } } // http-client-stack-grouping } 3. The "ietf-http-server" Module This section defines a YANG 1.1 module called "ietf-http-server". 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-http-server" module in terms of its features and groupings. 3.1.1. Features The following diagram lists all the "feature" statements defined in the "ietf-http-server" module: Features: +-- client-auth-supported +-- local-users-supported +-- basic-auth +-- tcp-supported +-- tls-supported Watsen Expires 25 November 2022 [Page 16] Internet-Draft Groupings for HTTP Clients and Servers May 2022 | The diagram above uses syntax that is similar to but not | defined in [RFC8340]. 3.1.2. Groupings The "ietf-http-server" module defines the following "grouping" statements: * http-server-grouping * http-server-stack-grouping Each of these groupings are presented in the following subsections. 3.1.2.1. The "http-server-grouping" Grouping The following tree diagram [RFC8340] illustrates the "http-server- grouping" grouping: grouping http-server-grouping: +-- server-name? string +-- client-authentication! {client-auth-supported}? +-- users {local-users-supported}? +-- user* [user-id] +-- user-id? string +-- (auth-type) +--:(basic) +-- basic {basic-auth}? +-- user-id? string +-- password? ianach:crypt-hash Comments: * The "http-server-grouping" defines the configuration for just "HTTP" part of a protocol stack. It does not, for instance, define any configuration for the "TCP" or "TLS" protocol layers (for that, see Section 3.1.2.2). * The "server-name" node defines the HTTP server's name, as presented to HTTP clients. * The "client-authentication" node, which must by enabled by a feature, defines a very simple user-database. Only the "basic" authentication scheme is supported, albeit it must be enabled by a "feature". Other authentication schemes MAY be augmented in. Watsen Expires 25 November 2022 [Page 17] Internet-Draft Groupings for HTTP Clients and Servers May 2022 3.1.2.2. The "http-server-stack-grouping" Grouping The following tree diagram [RFC8340] illustrates the "http-server- stack-grouping" grouping: grouping http-server-stack-grouping: +-- (transport) +--:(tcp) {tcp-supported}? | +-- tcp | +-- tcp-server-parameters | | +---u tcps:tcp-server-grouping | +-- http-server-parameters | +---u http-server-grouping +--:(tls) {tls-supported}? +-- tls +-- tcp-server-parameters | +---u tcps:tcp-server-grouping +-- tls-server-parameters | +---u tlss:tls-server-grouping +-- http-server-parameters +---u http-server-grouping Comments: * The "http-server-stack-grouping" is a convenience grouping for downstream modules. It defines both the "HTTP" and "HTTPS" protocol stacks, with each option enabled by a "feature" statement for application control. * For the referenced grouping statement(s): - The "tcp-server-grouping" grouping is discussed in Section 4.1.2.1 of [I-D.ietf-netconf-tcp-client-server]. - The "tls-server-grouping" grouping is discussed in Section 4.1.2.1 of [I-D.ietf-netconf-tls-client-server]. - The "http-server-grouping" grouping is discussed in Section 3.1.2.1 in this document. 3.1.3. Protocol-accessible Nodes The "ietf-http-server" module defines only "grouping" statements that are used by other modules to instantiate protocol-accessible nodes. 3.2. Example Usage This section presents an example showing the http-server-grouping populated with some data. Watsen Expires 25 November 2022 [Page 18] Internet-Draft Groupings for HTTP Clients and Servers May 2022 foo.example.com 3.3. YANG Module This YANG module has normative references to [RFC6991]. file "ietf-http-server@2022-05-24.yang" module ietf-http-server { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-http-server"; prefix https; 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-tcp-server { prefix tcps; reference "RFC DDDD: YANG Groupings for TCP Clients and TCP Servers"; } import ietf-tls-server { prefix tlss; reference "RFC FFFF: YANG Groupings for TLS Clients and TLS Servers"; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: https://datatracker.ietf.org/wg/netconf WG List: NETCONF WG list Watsen Expires 25 November 2022 [Page 19] Internet-Draft Groupings for HTTP Clients and Servers May 2022 Author: Kent Watsen "; description "This module defines reusable groupings for HTTP servers that can be used as a basis for specific HTTP server instances. 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). This version of this YANG module is part of RFC GGGG (https://www.rfc-editor.org/info/rfcGGGG); 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 2022-05-24 { description "Initial version"; reference "RFC GGGG: YANG Groupings for HTTP Clients and HTTP Servers"; } // Features feature client-auth-supported { description "Indicates that the configuration for how to authenticate clients can be configured herein. HTTP-level client authentication may not be needed when client authentication is expected to occur only at another protocol layer."; } feature local-users-supported { description "Indicates that the configuration for users can be configured herein, as opposed to in an application Watsen Expires 25 November 2022 [Page 20] Internet-Draft Groupings for HTTP Clients and Servers May 2022 specific location."; } feature basic-auth { description "The 'basic-auth' feature indicates that the server may be configured authenticate users using the 'basic' HTTP authentication scheme."; reference "RFC 7617: The 'Basic' HTTP Authentication Scheme"; } feature tcp-supported { description "Indicates that the server supports HTTP/TCP."; } feature tls-supported { description "Indicates that the server supports HTTP/TLS."; } // Groupings grouping http-server-grouping { description "A reusable grouping for configuring an HTTP server. Note that this grouping uses fairly typical descendant node names such that a stack 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 'http-server-parameters'). This model purposely does not do this itself so as to provide maximum flexibility to consuming models."; leaf server-name { nacm:default-deny-write; type string; description "The value of the 'Server' header field. If not set, then underlying software's default value is used. Set to the empty string to disable."; } container client-authentication { if-feature "client-auth-supported"; Watsen Expires 25 November 2022 [Page 21] Internet-Draft Groupings for HTTP Clients and Servers May 2022 nacm:default-deny-write; presence "Indicates that HTTP based client authentication is configured. This statement is present so the mandatory descendant nodes do not imply that this node must be configured."; description "Configures how the HTTP server can authenticate HTTP clients. The HTTP server will request that the HTTP client send authentication when needed."; container users { if-feature "local-users-supported"; description "A list of locally configured users."; list user { key "user-id"; description "The list of local users configured on this device."; leaf user-id { type string; description "The user-id for the authenticating client."; } choice auth-type { mandatory true; description "The authentication type."; case basic { container basic { if-feature "basic-auth"; leaf user-id { type string; description "The user-id for the authenticating client."; } leaf password { nacm:default-deny-write; type ianach:crypt-hash; description "The password for the authenticating client."; } description "The 'basic' HTTP scheme credentials."; reference "RFC 7617: The 'Basic' HTTP Authentication Scheme"; } } Watsen Expires 25 November 2022 [Page 22] Internet-Draft Groupings for HTTP Clients and Servers May 2022 } } } } // container client-authentication } // grouping http-server-grouping grouping http-server-stack-grouping { description "A grouping that defines common HTTP-based protocol stacks."; choice transport { mandatory true; description "Choice amongst various transports type. TCP, with and without TLS are defined here, with 'feature' statements so that they may be disabled. Other transports MAY be augmented in as 'case' statements by future efforts."; case tcp { if-feature "tcp-supported"; container tcp { description "Container for TCP-based HTTP protocols."; container tcp-server-parameters { description "A wrapper around the TCP parameters to avoid name collisions."; uses tcps:tcp-server-grouping; } container http-server-parameters { description "A wrapper around the HTTP parameters to avoid name collisions."; uses http-server-grouping; } } } case tls { if-feature "tls-supported"; container tls { description "Container for TLS-based HTTP protocols."; container tcp-server-parameters { description "A wrapper around the TCP parameters to avoid name collisions."; uses tcps:tcp-server-grouping; } container tls-server-parameters { description Watsen Expires 25 November 2022 [Page 23] Internet-Draft Groupings for HTTP Clients and Servers May 2022 "A wrapper around the TLS parameters to avoid name collisions."; uses tlss:tls-server-grouping; } container http-server-parameters { description "A wrapper around the HTTP parameters to avoid name collisions."; uses http-server-grouping; } } } } } // http-server-stack-grouping } 4. Security Considerations 4.1. The "ietf-http-client" YANG Module The "ietf-http-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 NETCONF 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 the module in this document 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/basic/password" node: The cleartext "password" node defined in the "http-client- identity-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. Watsen Expires 25 November 2022 [Page 24] Internet-Draft Groupings for HTTP Clients and Servers May 2022 | 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. 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. | Please be aware that this module uses groupings from the "ietf- | tls-client" and "ietf-tls-server" modules defined in | [I-D.ietf-netconf-tls-client-server]. All of the data nodes | defined in these groupings have the NACM extension "default- | deny-write" set, thus preventing unrestricted write-access to | the data nodes defined in those groupings. This module does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 4.2. The "ietf-http-server" YANG Module The "ietf-http-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 NETCONF 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 the module in this document 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. 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. Watsen Expires 25 November 2022 [Page 25] Internet-Draft Groupings for HTTP Clients and Servers May 2022 | Please be aware that this module uses groupings from the "ietf- | tls-client" and "ietf-tls-server" modules defined in | [I-D.ietf-netconf-tls-client-server]. All of the data nodes | defined in these groupings have the NACM extension "default- | deny-write" set, thus preventing unrestricted write-access to | the data nodes defined in those groupings. This module does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here. 5. IANA Considerations 5.1. The "IETF XML" Registry This document registers two URIs in the "ns" subregistry of the IETF XML Registry [RFC3688]. Following the format in [RFC3688], the following registrations are requested: URI: urn:ietf:params:xml:ns:yang:ietf-http-client Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-http-server Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace. 5.2. The "YANG Module Names" Registry This document registers two YANG modules in the YANG Module Names registry [RFC6020]. Following the format in [RFC6020], the following registrations are requested: name: ietf-http-client namespace: urn:ietf:params:xml:ns:yang:ietf-http-client prefix: httpc reference: RFC GGGG name: ietf-http-server namespace: urn:ietf:params:xml:ns:yang:ietf-http-server prefix: https reference: RFC GGGG 6. References 6.1. Normative References Watsen Expires 25 November 2022 [Page 26] Internet-Draft Groupings for HTTP Clients and Servers May 2022 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, July 2013, . [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, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . 6.2. Informative 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-22, 7 March 2022, . [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-09, 7 March 2022, . [I-D.ietf-netconf-keystore] Watsen, K., "A YANG Data Model for a Keystore", Work in Progress, Internet-Draft, draft-ietf-netconf-keystore-24, 7 March 2022, . Watsen Expires 25 November 2022 [Page 27] Internet-Draft Groupings for HTTP Clients and Servers May 2022 [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-25, 7 March 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-25, 7 March 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-27, 7 March 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-12, 7 March 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-27, 7 March 2022, . [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-17, 7 March 2022, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . Watsen Expires 25 November 2022 [Page 28] Internet-Draft Groupings for HTTP Clients and Servers May 2022 [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, . [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 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, . Appendix A. Change Log This section is to be removed before publishing as an RFC. A.1. 00 to 01 * Modified Abstract and Intro to be more accurate wrt intended applicability. * In ietf-http-client, removed "protocol-version" and all auth schemes except "basic". * In ietf-http-client, factored out "client-identity-grouping" for proxy connections. * In ietf-http-server, removed "choice required-or-optional" and "choice local-or-external". * In ietf-http-server, moved the basic auth under a "choice auth- type" limited by new "feature basic-auth". A.2. 01 to 02 * Removed the unused "external-client-auth-supported" feature from ietf-http-server. A.3. 02 to 03 * Removed "protocol-versions" from ietf-http-server based on HTTP WG feedback. Watsen Expires 25 November 2022 [Page 29] Internet-Draft Groupings for HTTP Clients and Servers May 2022 * Slightly restructured the "proxy-server" definition in ietf-http- client. * Added http-client example show proxy server use. * Added a "Note to Reviewers" note to first page. A.4. 03 to 04 * Added a parent "container" to "client-identity-grouping" so that it could be better used by the proxy model. * Added a "choice" to the proxy model enabling selection of proxy types. * Added 'http-client-stack-grouping' and 'http-server-stack- grouping' convenience groupings. * Expanded "Data Model Overview section(s) [remove "wall" of tree diagrams]. * Updated the Security Considerations section. A.5. 04 to 05 * Fixed titles and a ref in the IANA Considerations section * Cleaned up examples (e.g., removed FIXMEs) * Fixed issues found by the SecDir review of the "keystore" draft. * Updated the "ietf-http-client" module to use the new "password- grouping" grouping from the "crypto-types" module. A.6. 05 to 06 * Removed note questioning if okay for app to augment-in a 'path' node when needed, discussed during the 108 session. * Addressed comments raised by YANG Doctor in the ct/ts/ks drafts. A.7. 06 to 07 * Added XML-comment above examples explaining the reason for the unusual top-most element's presence. * Renamed 'client-auth-config-supported' to 'client-auth-supported' consistent with other drafts. Watsen Expires 25 November 2022 [Page 30] Internet-Draft Groupings for HTTP Clients and Servers May 2022 * Wrapped 'container basic' choice inside a 'case basic' per best practice. * Aligned modules with `pyang -f` formatting. * Fixed nits found by YANG Doctor reviews. A.8. 07 to 08 * Replaced "base64encodedvalue==" with "BASE64VALUE=" in examples. * Minor editorial nits A.9. 08 to 09 * 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) A.10. 09 to 10 * NO UPDATE. Acknowledgements The authors would like to thank for following for lively discussions on list and in the halls (ordered by first name): Ben Schwartz, Mark Nottingham, Rob Wilton (contributor), and Willy Tarreau. Author's Address Kent Watsen Watsen Networks Email: kent+ietf@watsen.net Watsen Expires 25 November 2022 [Page 31]