NETCONF Working Group K. Watsen Internet-Draft Watsen Networks Intended status: Standards Track March 9, 2019 Expires: September 10, 2019 YANG Groupings for HTTP Clients and HTTP Servers draft-kwatsen-netconf-http-client-server-00 Abstract This document defines two YANG modules: the first defines a grouping for configuring a generic HTTP client, and the second defines a grouping for configuring a generic HTTP server. It is intended that these groupings will be used by applications using the HTTP protocol. Editorial Note (To be removed by RFC Editor) This draft contains many 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 placeholder values for the date of publication of this draft. Please apply the following replacement: o "2019-03-09" --> the publication date of this draft The following Appendix section is to be removed prior to publication: o Appendix A. 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 September 10, 2019. Watsen Expires September 10, 2019 [Page 1] Internet-Draft Groupings for HTTP Clients and Servers March 2019 Copyright Notice Copyright (c) 2019 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 Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. The HTTP Client Model . . . . . . . . . . . . . . . . . . . . 3 3.1. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 3 3.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 4 3.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 5 4. The HTTP Server Model . . . . . . . . . . . . . . . . . . . . 9 4.1. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 9 4.2. Example Usage . . . . . . . . . . . . . . . . . . . . . . 10 4.3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 10 5. Security Considerations . . . . . . . . . . . . . . . . . . . 12 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13 6.1. The IETF XML Registry . . . . . . . . . . . . . . . . . . 13 6.2. The YANG Module Names Registry . . . . . . . . . . . . . 13 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1. Normative References . . . . . . . . . . . . . . . . . . 14 7.2. Informative References . . . . . . . . . . . . . . . . . 14 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 15 1. Introduction This document defines two YANG 1.1 [RFC7950] modules: the first defines a grouping for configuring a generic HTTP client, and the second defines a grouping for configuring a generic HTTP server. It is intended that these groupings will be used by applications using the HTTP protocol. For instance, these groupings could help define the configuration module for an SSH, TLS, or HTTP based application. Watsen Expires September 10, 2019 [Page 2] Internet-Draft Groupings for HTTP Clients and Servers March 2019 2. Terminology 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. 3. The HTTP Client Model 3.1. Tree Diagram This section provides a tree diagram [RFC8340] for the "ietf-http- client" module. module: ietf-http-client grouping http-client-grouping +-- http-client-identity | +-- (auth-type)? | +--:(basic) | | +-- basic | | +-- user-id? string | | +-- password? string | +--:(bearer) | | +-- bearer | | +-- token? string | +--:(digest) | | +-- digest | | +-- username? string | | +-- password? string | +--:(hoba) | | +-- hoba | +--:(mutual) | | +-- mutual | +--:(negotiate) | | +-- negotiate | +--:(oauth) | | +-- oauth | +--:(scram-sha-1) | | +-- scram-sha-1 | +--:(scram-sha-256) | | +-- scram-sha-256 | +--:(vapid) | +-- vapid +-- http-keepalives {http-client-keepalives}? +-- max-wait? uint16 +-- max-attempts? uint8 Watsen Expires September 10, 2019 [Page 3] Internet-Draft Groupings for HTTP Clients and Servers March 2019 grouping http-client-identity-grouping +-- http-client-identity +-- (auth-type)? +--:(basic) | +-- basic | +-- user-id? string | +-- password? string +--:(bearer) | +-- bearer | +-- token? string +--:(digest) | +-- digest | +-- username? string | +-- password? string +--:(hoba) | +-- hoba +--:(mutual) | +-- mutual +--:(negotiate) | +-- negotiate +--:(oauth) | +-- oauth +--:(scram-sha-1) | +-- scram-sha-1 +--:(scram-sha-256) | +-- scram-sha-256 +--:(vapid) +-- vapid grouping http-keepalives-grouping +-- http-keepalives {http-client-keepalives}? +-- max-wait? uint16 +-- max-attempts? uint8 3.2. Example Usage This section presents an example showing the http-client-grouping populated with some data. Watsen Expires September 10, 2019 [Page 4] Internet-Draft Groupings for HTTP Clients and Servers March 2019 bob secret 30 3 3.3. YANG Module This YANG module has normative references to [RFC6991]. file "ietf-http-client@2019-03-09.yang" module ietf-http-client { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-http-client"; prefix httpc; organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: 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. 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. Copyright (c) 2019 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 Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents Watsen Expires September 10, 2019 [Page 5] Internet-Draft Groupings for HTTP Clients and Servers March 2019 (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2019-03-09 { description "Initial version"; reference "RFC XXXX: YANG Groupings for HTTP Clients and HTTP Servers"; } // Features feature http-client-keepalives { description "Per socket HTTP keepalive parameters are configurable for HTTP clients on the server implementing this feature."; } // Groupings grouping http-client-grouping { description "A reusable grouping for configuring a HTTP client, including the IP address and port number it initiates a connections to."; uses http-client-identity-grouping; uses http-keepalives-grouping; // uses http-proxy-grouping; } grouping http-client-identity-grouping { description "A reusable grouping for configuring a HTTP client identity."; container http-client-identity { description "The credentials used by the client to authenticate to the HTTP server."; choice auth-type { description "The authentication type."; container basic { leaf user-id { type string; description "The user-id for the authenticating client."; } Watsen Expires September 10, 2019 [Page 6] Internet-Draft Groupings for HTTP Clients and Servers March 2019 leaf password { type string; description "The password for the authenticating client."; } description "The 'basic' HTTP scheme credentials."; reference "RFC 7617: The 'Basic' HTTP Authentication Scheme"; } container bearer { leaf token { type string; description "The bearer token for the authenticating client, encoded in base64, as described in RFC 6750, Section 2.1."; } description "The 'bearer' HTTP scheme credentials."; reference "RFC 6750: The OAuth 2.0 Authorization Framework: Bearer Token Usage"; } container digest { leaf username { type string; description "The username for the authenticating client."; } leaf password { type string; description "The password for the authenticating client."; } description "The 'digest' HTTP scheme credentials."; reference "RFC 7616: HTTP Digest Access Authentication"; } container hoba { // FIXME description "The 'hoba' HTTP scheme credentials."; reference "RFC 7486: HTTP Origin-Bound Authentication (HOBA)"; } container mutual { Watsen Expires September 10, 2019 [Page 7] Internet-Draft Groupings for HTTP Clients and Servers March 2019 // FIXME description "The 'mutual' HTTP scheme credentials."; reference "RFC 8120: Mutual Authentication Protocol for HTTP"; } container negotiate { // FIXME description "The 'negotiate' HTTP scheme credentials."; reference "RFC 4559: SPNEGO-based Kerberos and NTLM HTTP Authentication in Microsoft Windows"; } container oauth { // FIXME description "The 'oauth' HTTP scheme credentials."; reference "RFC 6749: The OAuth 2.0 Authorization Framework"; } container scram-sha-1 { // FIXME description "The 'scram-sha-1' HTTP scheme credentials."; reference "RFC 7804: Salted Challenge Response HTTP Authentication Mechanism"; } container scram-sha-256 { // FIXME description "The 'scram-sha-256' HTTP scheme credentials."; reference "RFC 7804: Salted Challenge Response HTTP Authentication Mechanism"; } container vapid { // FIXME description "The 'vapid' HTTP scheme credentials."; reference "RFC 8292: Voluntary Application Server Identification (VAPID) for Web Push"; } } } } Watsen Expires September 10, 2019 [Page 8] Internet-Draft Groupings for HTTP Clients and Servers March 2019 grouping http-keepalives-grouping { description "A reusable grouping for configuring HTTP client keepalive parameters."; container http-keepalives { if-feature "http-client-keepalives"; description "Configures the keep-alive policy, to proactively test the aliveness of the HTTP server. An unresponsive HTTP server is dropped after approximately max-wait * max-attempts seconds."; 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 HTTP server, a HTTP level message will be sent to test the aliveness of the HTTP 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 HTTP server before assuming the HTTP server is no longer alive."; } } } } 4. The HTTP Server Model 4.1. Tree Diagram This section provides a tree diagram [RFC8340] for the "ietf-http- server" module. Watsen Expires September 10, 2019 [Page 9] Internet-Draft Groupings for HTTP Clients and Servers March 2019 module: ietf-http-server grouping http-server-grouping +-- http-keepalives {http-server-keepalives}? +-- max-wait? uint16 +-- max-attempts? uint8 grouping keepalives-grouping +-- http-keepalives {http-server-keepalives}? +-- max-wait? uint16 +-- max-attempts? uint8 4.2. Example Usage This section presents an example showing the http-server-grouping populated with some data. 30 3 4.3. YANG Module This YANG module has normative references to [RFC6991]. file "ietf-http-server@2019-03-09.yang" module ietf-http-server { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-http-server"; prefix https; organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: WG List: Author: Kent Watsen "; description "This module defines reusable groupings for HTTP servers that can be used as a basis for specific HTTP server instances. 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 Watsen Expires September 10, 2019 [Page 10] Internet-Draft Groupings for HTTP Clients and Servers March 2019 capitals, as shown here. Copyright (c) 2019 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 Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2019-03-09 { description "Initial version"; reference "RFC XXXX: YANG Groupings for HTTP Clients and HTTP Servers"; } // Features feature http-server-keepalives { description "Per socket HTTP keepalive parameters are configurable for HTTP servers on the server implementing this feature."; } // Groupings grouping http-server-grouping { description "A reusable grouping for configuring a HTTP server, including the IP address and port number it listens for connections on."; uses keepalives-grouping; } grouping keepalives-grouping { description "A reusable grouping for configuring HTTP server keepalive parameters."; container http-keepalives { if-feature "http-server-keepalives"; description "Configures the keep-alive policy, to proactively test Watsen Expires September 10, 2019 [Page 11] Internet-Draft Groupings for HTTP Clients and Servers March 2019 the aliveness of the HTTP client. An unresponsive HTTP client is dropped after approximately max-wait * max-attempts seconds."; 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 HTTP client, a HTTP level message will be sent to test the aliveness of the HTTP 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 HTTP client before assuming the HTTP client is no longer alive."; } } } } 5. Security Considerations The YANG modules defined in this document 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, HTTP) 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 modules defined in this document only define groupings, these considerations are primarily for the designers of other modules that use these groupings. There are a number of data nodes defined in the YANG modules that are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) Watsen Expires September 10, 2019 [Page 12] Internet-Draft Groupings for HTTP Clients and Servers March 2019 to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability: NONE Some of the readable data nodes in the YANG modules may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get-config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability: NONE Some of the RPC operations in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control access to these operations. These are the operations and their sensitivity/vulnerability: NONE 6. IANA Considerations 6.1. 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 NETCONF WG of the IETF. XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-http-server Registrant Contact: The NETCONF WG of the IETF. XML: N/A, the requested URI is an XML namespace. 6.2. 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: Watsen Expires September 10, 2019 [Page 13] Internet-Draft Groupings for HTTP Clients and Servers March 2019 name: ietf-http-client namespace: urn:ietf:params:xml:ns:yang:ietf-http-client prefix: httpc reference: RFC XXXX name: ietf-http-server namespace: urn:ietf:params:xml:ns:yang:ietf-http-server prefix: https reference: RFC XXXX 7. References 7.1. Normative References [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, . 7.2. Informative References [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . Watsen Expires September 10, 2019 [Page 14] Internet-Draft Groupings for HTTP Clients and Servers March 2019 [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, . Author's Address Kent Watsen Watsen Networks EMail: kent+ietf@watsen.net Watsen Expires September 10, 2019 [Page 15]