YANG Groupings for
HTTP Clients and HTTP ServersWatsen Networkskent+ietf@watsen.net
Operations
NETCONF Working GroupThis 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.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: 2019-11-20 --> the publication
date of this draftThe following Appendix section is to be removed prior to publication:
Appendix A. Change LogThis document defines two YANG 1.1 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.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
when, and only when,
they appear in all capitals, as shown here.This section provides a tree diagram for
the "ietf-http-client" module.This section presents an example showing the http-client-grouping
populated with some data.HTTP/1.1bobsecret
]]>This YANG module has normative references to . file "ietf-http-client@2019-11-20.yang"
module ietf-http-client {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-http-client";
prefix httpc;
import ietf-tcp-client {
prefix tcpc;
reference
"RFC AAAA: YANG Groupings for TCP Clients and TCP Servers";
}
import ietf-tls-client {
prefix tlsc;
reference
"RFC BBBB: YANG Groupings for TLS Clients and TLS Servers";
}
import ietf-netconf-acm {
prefix nacm;
reference
"RFC 8341: Network Configuration Access Control Model";
}
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.
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
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); 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 2019-11-20 {
description
"Initial version";
reference
"RFC XXXX: 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
"fixme";
}
feature bearer-auth {
description
"fixme";
}
feature digest-auth {
description
"fixme";
}
feature hoba-auth {
description
"fixme";
}
feature mutual-auth {
description
"fixme";
}
feature negotiate-auth {
description
"fixme";
}
feature oauth-auth {
description
"fixme";
}
feature scram-sha-1-auth {
description
"fixme";
}
feature scram-sha-256-auth {
description
"fixme";
}
feature vapid-auth {
description
"fixme";
}
// 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.
Note that this grouping uses fairly typical descendent
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.";
leaf protocol-version {
nacm:default-deny-write;
type enumeration {
enum HTTP/1.0 {
description
"The client should use the 'HTTP/1.0' protocol.";
}
enum HTTP/1.1 {
description
"The client should use the 'HTTP/1.1' protocol.";
}
enum HTTP/2.0 {
description
"The client should use the 'HTTP/2.0' protocol.";
}
}
description
"The HTTP protocol version the client should use.";
} // leaf protocol-version
container client-identity {
nacm:default-deny-write;
description
"The credentials used by the client to authenticate to
the HTTP server.";
choice auth-type {
description
"The authentication type.";
container basic {
if-feature "basic-auth";
leaf user-id {
type string;
description
"The user-id for the authenticating client.";
}
leaf password {
nacm:default-deny-all;
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 {
if-feature "bearer-auth";
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 {
if-feature "digest-auth";
leaf username {
type string;
description
"The username for the authenticating client.";
}
leaf password {
nacm:default-deny-all;
type string;
description
"The password for the authenticating client.";
}
description
"The 'digest' HTTP scheme credentials.";
reference
"RFC 7616: HTTP Digest Access Authentication";
}
container hoba {
if-feature "hoba-auth";
// FIXME
description
"The 'hoba' HTTP scheme credentials.";
reference
"RFC 7486: HTTP Origin-Bound Authentication (HOBA)";
}
container mutual {
if-feature "mutual-auth";
// FIXME
description
"The 'mutual' HTTP scheme credentials.";
reference
"RFC 8120: Mutual Authentication Protocol for HTTP";
}
container negotiate {
if-feature "negotiate-auth";
// FIXME
description
"The 'negotiate' HTTP scheme credentials.";
reference
"RFC 4559: SPNEGO-based Kerberos and NTLM HTTP
Authentication in Microsoft Windows";
}
container oauth {
if-feature "oauth-auth";
// FIXME
description
"The 'oauth' HTTP scheme credentials.";
reference
"RFC 6749: The OAuth 2.0 Authorization Framework";
}
container scram-sha-1 {
if-feature "scram-sha-1-auth";
// FIXME
description
"The 'scram-sha-1' HTTP scheme credentials.";
reference
"RFC 7804: Salted Challenge Response HTTP
Authentication Mechanism";
}
container scram-sha-256 {
if-feature "scram-sha-256-auth";
// FIXME
description
"The 'scram-sha-256' HTTP scheme credentials.";
reference
"RFC 7804: Salted Challenge Response HTTP
Authentication Mechanism";
}
container vapid {
if-feature "vapid-auth";
// FIXME
description
"The 'vapid' HTTP scheme credentials.";
reference
"RFC 8292: Voluntary Application Server
Identification (VAPID) for Web Push";
}
}
} // container client-identity
container proxy-server {
nacm:default-deny-write;
if-feature "proxy-connect";
presence true; // only so ex-http-client can pass validation?
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";
}
container proxy-client-identity {
leaf user-id {
type string;
description
"The user-id for the authenticating client.";
}
leaf password {
nacm:default-deny-all;
type string;
description
"The password for the authenticating client.";
}
description
"The 'basic' HTTP scheme credentials.";
reference
"RFC 7617: The 'Basic' HTTP Authentication Scheme";
}
description
"Proxy server settings.";
} // container proxy-server
} //grouping http-client-grouping
}
]]>This section provides a tree diagram for
the "ietf-http-server" module.This section presents an example showing the http-server-grouping
populated with some data.foo.example.comHTTP/1.1HTTP/2.0
]]>This YANG module has normative references to . file "ietf-http-server@2019-11-20.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";
}
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.
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
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); 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 2019-11-20 {
description
"Initial version";
reference
"RFC XXXX: YANG Groupings for HTTP Clients and HTTP Servers";
}
// Features
feature local-client-auth-supported {
description
"Indicates that the HTTP server supports local configuration
of client credentials.";
}
feature external-client-auth-supported {
description
"Indicates that the HTTP server supports external configuration
of client credentials.";
}
// Groupings
grouping http-server-grouping {
description
"A reusable grouping for configuring an HTTP server.
Note that this grouping uses fairly typical descendent
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 protocol-versions {
nacm:default-deny-write;
description
"A list of HTTP protocol versions supported by this
server.";
leaf-list protocol-version {
type enumeration {
enum "HTTP/1.0" {
description
"The server supports the 'HTTP/1.0' protocol.";
}
enum "HTTP/1.1" {
description
"The server supports the 'HTTP/1.1' protocol.";
}
enum "HTTP/2.0" {
description
"The server supports the 'HTTP/2.0' protocol.";
}
}
description
"An HTTP protocol version supported by this server.";
}
}
container client-authentication {
nacm:default-deny-write;
presence
"Indicates that HTTP based client authentication is
supported (i.e., the server will request that the
HTTP client send authenticate when needed). This
is needed as some HTTP-based protocols may only
support, e.g., TLS-level client authentication.";
description
"Specifies if HTTP client authentication is required or
optional, and specifies if the credentials needed to
authenticate the HTTP client are configured locally
or externally.";
choice required-or-optional {
mandatory true; // or default to 'required' ?
description
"Indicates if HTTP-level client authentication is required
or optional. This is necessary for some protocols (e.g.,
RESTCONF) that may optionally authenticate a client via
TLS-level authentication, HTTP-level authentication, or
both simultaneously).";
leaf required {
type empty;
description
"Indicates that HTTP-level client authentication is
required to access protected resources.";
}
leaf optional {
type empty;
description
"Indicates that HTTP-level client authentication is
optional to access protected resources.";
}
}
choice local-or-external {
mandatory true;
description
"Indicates if the client credentials are configured
locally or externally. The need to support external
configuration for client authentication stems from
the desire to support consuming data models that
prefer to place client authentication with client
definitions, rather then in a data model principly
concerned with configuring the transport.";
case local {
if-feature "local-client-auth-supported";
description
"Client credentials are configured locally.";
container users {
description
"A list of locally configured users.";
list user {
key name;
description
"The list of local users configured on this device.";
leaf name {
type string;
description
"The user name string identifying this entry.";
}
leaf password {
type ianach:crypt-hash;
description
"The password for this entry.";
}
}
}
}
case external {
if-feature "external-client-auth-supported";
description
"Client credentials are configured externally.";
leaf client-auth-defined-elsewhere {
type empty;
description
"Indicates that credentials needed to authenticate
clients are configured elsewhere.";
}
}
} // choice local-or-external
} // container client-authentication
}
}
]]>The YANG modules defined in this document are designed to be accessed
via YANG based management protocols, such as NETCONF and RESTCONF . Both of these
protocols have mandatory-to-implement secure transport layers (e.g.,
SSH, HTTP) with mutual authentication.The NETCONF access control model (NACM)
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) 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: 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: 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: This document registers two URIs in the "ns" subregistry of the
IETF XML Registry . Following the format in
, 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.
This document registers two YANG modules in the YANG Module Names
registry . Following the format in , the following registrations are requested:
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