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NETCONF Working Group                                          K. Watsen
Internet-Draft                                           Watsen Networks
Intended status: Standards Track                            May 20, 2020
Expires: November 21, 2020

RESTCONF Client and Server Models
draft-ietf-netconf-restconf-client-server-19

Abstract

This document defines two YANG modules, one module to configure a
RESTCONF client and the other module to configure a RESTCONF server.
Both modules support the TLS transport protocol with both standard
RESTCONF and RESTCONF Call Home connections.

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):

o  "AAAA" --> the assigned RFC value for draft-ietf-netconf-crypto-
types

o  "BBBB" --> the assigned RFC value for draft-ietf-netconf-trust-
anchors

o  "CCCC" --> the assigned RFC value for draft-ietf-netconf-keystore

o  "DDDD" --> the assigned RFC value for draft-ietf-netconf-tcp-
client-server

o  "EEEE" --> the assigned RFC value for draft-ietf-netconf-ssh-
client-server

o  "FFFF" --> the assigned RFC value for draft-ietf-netconf-tls-
client-server

o  "GGGG" --> the assigned RFC value for draft-ietf-netconf-http-
client-server

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o  "HHHH" --> the assigned RFC value for draft-ietf-netconf-netconf-
client-server

o  "IIII" --> 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:

o  "2020-05-20" --> the publication date of this draft

The following Appendix section is to be removed prior to publication:

o  Appendix B.  Change Log

Note to Reviewers (To be removed by RFC Editor)

This document presents a YANG module or modules that is/are part of a
collection of drafts that work together to produce the ultimate goal
of the NETCONF WG: to define configuration modules for NETCONF client
and servers, and RESTCONF client and servers.

The relationship between the various drafts in the collection is
presented in the below diagram.

crypto-types
^      ^
/        \
/          \
trust-anchors        keystore
^     ^              ^  ^
|     +---------+    |  |
|               |    |  |
|       +------------+  |
tcp-client-server     |      /        |       |
^    ^        ssh-client-server    |       |
|    |           ^            tls-client-server
|    |           |              ^     ^        http-client-server
|    |           |              |     |                 ^
|    |           |        +-----+     +---------+       |
|    |           |        |                     |       |
|    +-----------|--------|--------------+      |       |
|                |        |              |      |       |
+-----------+    |        |              |      |       |
|    |        |              |      |       |
|    |        |              |      |       |
netconf-client-server       restconf-client-server

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Full draft names and link to drafts:

o  draft-ietf-netconf-crypto-types (html [1])

o  draft-ietf-netconf-trust-anchors (html [2])

o  draft-ietf-netconf-keystore (html [3])

o  draft-ietf-netconf-tcp-client-server (html [4])

o  draft-ietf-netconf-ssh-client-server (html [5])

o  draft-ietf-netconf-tls-client-server (html [6])

o  draft-ietf-netconf-http-client-server (html [7])

o  draft-ietf-netconf-netconf-client-server (html [8])

o  draft-ietf-netconf-restconf-client-server (html [9])

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 November 21, 2020.

Copyright (c) 2020 IETF Trust and the persons identified as the

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

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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.

1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   5
2.  The RESTCONF Client Model . . . . . . . . . . . . . . . . . .   5
2.1.  Tree Diagram  . . . . . . . . . . . . . . . . . . . . . .   5
2.2.  Example Usage . . . . . . . . . . . . . . . . . . . . . .   7
2.3.  YANG Module . . . . . . . . . . . . . . . . . . . . . . .  10
3.  The RESTCONF Server Model . . . . . . . . . . . . . . . . . .  21
3.1.  Tree Diagram  . . . . . . . . . . . . . . . . . . . . . .  21
3.2.  Example Usage . . . . . . . . . . . . . . . . . . . . . .  23
3.3.  YANG Module . . . . . . . . . . . . . . . . . . . . . . .  27
4.  Security Considerations . . . . . . . . . . . . . . . . . . .  39
5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  40
5.1.  The IETF XML Registry . . . . . . . . . . . . . . . . . .  40
5.2.  The YANG Module Names Registry  . . . . . . . . . . . . .  40
6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  41
6.1.  Normative References  . . . . . . . . . . . . . . . . . .  41
6.2.  Informative References  . . . . . . . . . . . . . . . . .  42
6.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  42
Appendix A.  Expanded Tree Diagrams . . . . . . . . . . . . . . .  44
A.1.  Expanded Tree Diagram for 'ietf-restconf-client'  . . . .  44
A.2.  Expanded Tree Diagram for 'ietf-restconf-server'  . . . .  76
Appendix B.  Change Log . . . . . . . . . . . . . . . . . . . . .  89
B.1.  00 to 01  . . . . . . . . . . . . . . . . . . . . . . . .  89
B.2.  01 to 02  . . . . . . . . . . . . . . . . . . . . . . . .  89
B.3.  02 to 03  . . . . . . . . . . . . . . . . . . . . . . . .  89
B.4.  03 to 04  . . . . . . . . . . . . . . . . . . . . . . . .  90
B.5.  04 to 05  . . . . . . . . . . . . . . . . . . . . . . . .  90
B.6.  05 to 06  . . . . . . . . . . . . . . . . . . . . . . . .  90
B.7.  06 to 07  . . . . . . . . . . . . . . . . . . . . . . . .  90
B.8.  07 to 08  . . . . . . . . . . . . . . . . . . . . . . . .  91
B.9.  08 to 09  . . . . . . . . . . . . . . . . . . . . . . . .  91
B.10. 09 to 10  . . . . . . . . . . . . . . . . . . . . . . . .  91
B.11. 10 to 11  . . . . . . . . . . . . . . . . . . . . . . . .  91
B.12. 11 to 12  . . . . . . . . . . . . . . . . . . . . . . . .  91
B.13. 12 to 13  . . . . . . . . . . . . . . . . . . . . . . . .  92
B.14. 13 to 14  . . . . . . . . . . . . . . . . . . . . . . . .  92
B.15. 14 to 15  . . . . . . . . . . . . . . . . . . . . . . . .  92
B.16. 15 to 16  . . . . . . . . . . . . . . . . . . . . . . . .  93
B.17. 16 to 17  . . . . . . . . . . . . . . . . . . . . . . . .  93
B.18. 17 to 18  . . . . . . . . . . . . . . . . . . . . . . . .  93
B.19. 18 to 19  . . . . . . . . . . . . . . . . . . . . . . . .  93
Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  93

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Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  93

1.  Introduction

This document defines two YANG [RFC7950] modules, one module to
configure a RESTCONF client and the other module to configure a
RESTCONF server [RFC8040].  Both modules support the TLS [RFC8446]
transport protocol with both standard RESTCONF and RESTCONF Call Home
connections [RFC8071].

1.1.  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.

2.  The RESTCONF Client Model

The RESTCONF client model presented in this section supports both
clients initiating connections to servers, as well as clients
listening for connections from servers calling home.

YANG feature statements are used to enable implementations to
advertise which potentially uncommon parts of the model the RESTCONF
client supports.

2.1.  Tree Diagram

The following tree diagram [RFC8340] provides an overview of the data
model for the "ietf-restconf-client" module.

This tree diagram only shows the nodes defined in this module; it
does show the nodes defined by "grouping" statements used by this
module.

Please see Appendix A.1 for a tree diagram that illustrates what the
module looks like with all the "grouping" statements expanded.

module: ietf-restconf-client
+--rw restconf-client
+---u restconf-client-app-grouping

grouping restconf-client-grouping
grouping restconf-client-initiate-stack-grouping
+-- (transport)
+--:(https) {https-initiate}?

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+-- https
+-- tcp-client-parameters
|  +---u tcpc:tcp-client-grouping
+-- tls-client-parameters
|  +---u tlsc:tls-client-grouping
+-- http-client-parameters
|  +---u httpc:http-client-grouping
+-- restconf-client-parameters
grouping restconf-client-listen-stack-grouping
+-- (transport)
+--:(http) {http-listen}?
|  +-- http
|     +-- tcp-server-parameters
|     |  +---u tcps:tcp-server-grouping
|     +-- http-client-parameters
|     |  +---u httpc:http-client-grouping
|     +-- restconf-client-parameters
+--:(https) {https-listen}?
+-- https
+-- tcp-server-parameters
|  +---u tcps:tcp-server-grouping
+-- tls-client-parameters
|  +---u tlsc:tls-client-grouping
+-- http-client-parameters
|  +---u httpc:http-client-grouping
+-- restconf-client-parameters
grouping restconf-client-app-grouping
+-- initiate! {https-initiate}?
|  +-- restconf-server* [name]
|     +-- name?                 string
|     +-- endpoints
|     |  +-- endpoint* [name]
|     |     +-- name?                                      string
|     |     +---u restconf-client-initiate-stack-grouping
|     +-- connection-type
|     |  +-- (connection-type)
|     |     +--:(persistent-connection)
|     |     |  +-- persistent!
|     |     +--:(periodic-connection)
|     |        +-- periodic!
|     |           +-- period?         uint16
|     |           +-- anchor-time?    yang:date-and-time
|     |           +-- idle-timeout?   uint16
|     +-- reconnect-strategy
|        +-- start-with?     enumeration
|        +-- max-attempts?   uint8
+-- listen! {http-listen or https-listen}?
+-- idle-timeout?   uint16

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+-- endpoint* [name]
+-- name?                                    string
+---u restconf-client-listen-stack-grouping

2.2.  Example Usage

The following example illustrates configuring a RESTCONF client to
initiate connections, as well as listening for call-home connections.

This example is 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].

========== NOTE: '\' line wrapping per BCP XXX (RFC XXXX) ===========

<restconf-client
xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf-client"
xmlns:ct="urn:ietf:params:xml:ns:yang:ietf-crypto-types">

<!-- RESTCONF servers to initiate connections to -->
<initiate>
<restconf-server>
<name>corp-fw1</name>
<endpoints>
<endpoint>
<name>corp-fw1.example.com</name>
<https>
<tcp-client-parameters>
<keepalives>
<idle-time>15</idle-time>
<max-probes>3</max-probes>
<probe-interval>30</probe-interval>
</keepalives>
</tcp-client-parameters>
<tls-client-parameters>
<client-identity>
<certificate>
<local-definition>
<public-key-format>ct:subject-public-key-info-fo\
rmat</public-key-format>
<public-key>base64encodedvalue==</public-key>
<private-key-format>ct:rsa-private-key-format</p\
rivate-key-format>
<private-key>base64encodedvalue==</private-key>
<cert>base64encodedvalue==</cert>
</local-definition>
</certificate>

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</client-identity>
<server-authentication>
<ca-certs>
<truststore-reference>trusted-server-ca-certs</tru\
ststore-reference>
</ca-certs>
<ee-certs>
<truststore-reference>trusted-server-ee-certs</tru\
ststore-reference>
</ee-certs>
</server-authentication>
<keepalives>
<test-peer-aliveness>
<max-wait>30</max-wait>
<max-attempts>3</max-attempts>
</test-peer-aliveness>
</keepalives>
</tls-client-parameters>
<http-client-parameters>
<client-identity>
<basic>
<user-id>bob</user-id>
</basic>
</client-identity>
</http-client-parameters>
</https>
</endpoint>
<endpoint>
<name>corp-fw2.example.com</name>
<https>
<tcp-client-parameters>
<keepalives>
<idle-time>15</idle-time>
<max-probes>3</max-probes>
<probe-interval>30</probe-interval>
</keepalives>
</tcp-client-parameters>
<tls-client-parameters>
<client-identity>
<certificate>
<local-definition>
<public-key-format>ct:subject-public-key-info-fo\
rmat</public-key-format>
<public-key>base64encodedvalue==</public-key>
<private-key-format>ct:rsa-private-key-format</p\
rivate-key-format>

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<private-key>base64encodedvalue==</private-key>
<cert>base64encodedvalue==</cert>
</local-definition>
</certificate>
</client-identity>
<server-authentication>
<ca-certs>
<truststore-reference>trusted-server-ca-certs</tru\
ststore-reference>
</ca-certs>
<ee-certs>
<truststore-reference>trusted-server-ee-certs</tru\
ststore-reference>
</ee-certs>
</server-authentication>
<keepalives>
<test-peer-aliveness>
<max-wait>30</max-wait>
<max-attempts>3</max-attempts>
</test-peer-aliveness>
</keepalives>
</tls-client-parameters>
<http-client-parameters>
<client-identity>
<basic>
<user-id>bob</user-id>
</basic>
</client-identity>
</http-client-parameters>
</https>
</endpoint>
</endpoints>
<connection-type>
<persistent/>
</connection-type>
</restconf-server>
</initiate>

<!-- endpoints to listen for RESTCONF Call Home connections on -->
<listen>
<endpoint>
<name>Intranet-facing listener</name>
<https>
<tcp-server-parameters>
</tcp-server-parameters>
<tls-client-parameters>

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<client-identity>
<certificate>
<local-definition>
<public-key-format>ct:subject-public-key-info-format\
</public-key-format>
<public-key>base64encodedvalue==</public-key>
<private-key-format>ct:rsa-private-key-format</priva\
te-key-format>
<private-key>base64encodedvalue==</private-key>
<cert>base64encodedvalue==</cert>
</local-definition>
</certificate>
</client-identity>
<server-authentication>
<ca-certs>
<truststore-reference>trusted-server-ca-certs</trustst\
ore-reference>
</ca-certs>
<ee-certs>
<truststore-reference>trusted-server-ee-certs</trustst\
ore-reference>
</ee-certs>
</server-authentication>
<keepalives>
<peer-allowed-to-send/>
</keepalives>
</tls-client-parameters>
<http-client-parameters>
<client-identity>
<basic>
<user-id>bob</user-id>
</basic>
</client-identity>
</http-client-parameters>
</https>
</endpoint>
</listen>
</restconf-client>

2.3.  YANG Module

This YANG module has normative references to [RFC6991], [RFC8040],
and [RFC8071], [I-D.kwatsen-netconf-tcp-client-server],
[I-D.ietf-netconf-tls-client-server], and
[I-D.kwatsen-netconf-http-client-server].

<CODE BEGINS> file "ietf-restconf-client@2020-05-20.yang"

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module ietf-restconf-client {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-restconf-client";
prefix rcc;

import ietf-yang-types {
prefix yang;
reference
"RFC 6991: Common YANG Data Types";
}

import ietf-tcp-client {
prefix tcpc;
reference
"RFC DDDD: YANG Groupings for TCP Clients and TCP Servers";
}

import ietf-tcp-server {
prefix tcps;
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";
}

import ietf-http-client {
prefix httpc;
reference
"RFC GGGG: YANG Groupings for HTTP Clients and HTTP Servers";
}

organization
"IETF NETCONF (Network Configuration) Working Group";

contact
"WG Web:   <http://datatracker.ietf.org/wg/netconf/>
WG List:  <mailto:netconf@ietf.org>
Author:   Kent Watsen <mailto:kent+ietf@watsen.net>
Author:   Gary Wu <mailto:garywu@cisco.com>";

description
"This module contains a collection of YANG definitions
for configuring RESTCONF clients.

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Copyright (c) 2020 IETF Trust and the persons identified

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

This version of this YANG module is part of RFC IIII
(https://www.rfc-editor.org/info/rfcIIII); 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 2020-05-20 {
description
"Initial version";
reference
"RFC IIII: RESTCONF Client and Server Models";
}

// Features

feature https-initiate {
description
"The 'https-initiate' feature indicates that the RESTCONF
client supports initiating HTTPS connections to RESTCONF
servers. This feature exists as HTTPS might not be a
mandatory to implement transport in the future.";
reference
"RFC 8040: RESTCONF Protocol";
}

feature http-listen {
description
"The 'https-listen' feature indicates that the RESTCONF client
supports opening a port to listen for incoming RESTCONF
server call-home connections.  This feature exists as not
all RESTCONF clients may support RESTCONF call home.";
reference
"RFC 8071: NETCONF Call Home and RESTCONF Call Home";

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}

feature https-listen {
description
"The 'https-listen' feature indicates that the RESTCONF client
supports opening a port to listen for incoming RESTCONF
server call-home connections.  This feature exists as not
all RESTCONF clients may support RESTCONF call home.";
reference
"RFC 8071: NETCONF Call Home and RESTCONF Call Home";
}

// Groupings

grouping restconf-client-grouping {
description
"A reusable grouping for configuring a RESTCONF client
without any consideration for how underlying transport
sessions are established.

This grouping currently doesn't define any nodes.";
}

grouping restconf-client-initiate-stack-grouping {
description
"A reusable grouping for configuring a RESTCONF client
'initiate' protocol stack for a single connection.";

choice transport {
mandatory true;
description
"Selects between available transports. This is a
'choice' statement so as to support additional
transport options to be augmented in.";
case https {
if-feature "https-initiate";
container https {
description
"Specifies HTTPS-specific transport
configuration.";
container tcp-client-parameters {
description
"A wrapper around the TCP client parameters
to avoid name collisions.";
uses tcpc:tcp-client-grouping {
refine "remote-port" {
default "443";
description

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"The RESTCONF client will attempt to
connect to the IANA-assigned well-known
port value for 'https' (443) if no value
is specified.";
}
}
}
container tls-client-parameters {
must 'client-identity' {
description
"NETCONF/TLS clients MUST pass some
authentication credentials.";
}
description
"A wrapper around the TLS client parameters
to avoid name collisions.";
uses tlsc:tls-client-grouping;
}
container http-client-parameters {
description
"A wrapper around the HTTP client parameters
to avoid name collisions.";
uses httpc:http-client-grouping;
}
container restconf-client-parameters {
description
"A wrapper around the HTTP client parameters
to avoid name collisions.";
uses rcc:restconf-client-grouping;
}
}
}
}
} // restconf-client-initiate-stack-grouping

grouping restconf-client-listen-stack-grouping {
description
"A reusable grouping for configuring a RESTCONF client
'listen' protocol stack for a single connection.  The
'listen' stack supports call home connections, as
described in RFC 8071";
reference
"RFC 8071: NETCONF Call Home and RESTCONF Call Home";
choice transport {
mandatory true;
description
"Selects between available transports. This is a
'choice' statement so as to support additional

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transport options to be augmented in.";
case http {
if-feature "http-listen";
container http {
description
"HTTP-specific listening configuration for inbound
connections.

This transport option is made available to support
deployments where the TLS connections are terminated
by another system (e.g., a load balanacer) fronting
the client.";
container tcp-server-parameters {
description
"A wrapper around the TCP client parameters
to avoid name collisions.";
uses tcps:tcp-server-grouping {
refine "local-port" {
default "4336";
description
"The RESTCONF client will listen on the IANA-
assigned well-known port for 'restconf-ch-tls'
(4336) if no value is specified.";
}
}
}
container http-client-parameters {
description
"A wrapper around the HTTP client parameters
to avoid name collisions.";
uses httpc:http-client-grouping;
}
container restconf-client-parameters {
description
"A wrapper around the RESTCONF client parameters
to avoid name collisions.";
uses rcc:restconf-client-grouping;
}
}
}
case https {
if-feature "https-listen";
container https {
description
"HTTPS-specific listening configuration for inbound
connections.";
container tcp-server-parameters {
description

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"A wrapper around the TCP client parameters
to avoid name collisions.";
uses tcps:tcp-server-grouping {
refine "local-port" {
default "4336";
description
"The RESTCONF client will listen on the IANA-
assigned well-known port for 'restconf-ch-tls'
(4336) if no value is specified.";
}
}
}
container tls-client-parameters {
must 'client-identity' {
description
"NETCONF/TLS clients MUST pass some
authentication credentials.";
}
description
"A wrapper around the TLS client parameters
to avoid name collisions.";
uses tlsc:tls-client-grouping;
}
container http-client-parameters {
description
"A wrapper around the HTTP client parameters
to avoid name collisions.";
uses httpc:http-client-grouping;
}
container restconf-client-parameters {
description
"A wrapper around the RESTCONF client parameters
to avoid name collisions.";
uses rcc:restconf-client-grouping;
}
}
}
}
} // restconf-client-listen-stack-grouping

grouping restconf-client-app-grouping {
description
"A reusable grouping for configuring a RESTCONF client
application that supports both 'initiate' and 'listen'
protocol stacks for a multiplicity of connections.";
container initiate {
if-feature "https-initiate";
presence "Enables client to initiate TCP connections";

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description
"Configures client initiating underlying TCP connections.";
list restconf-server {
key "name";
min-elements 1;
description
"List of RESTCONF servers the RESTCONF client is to
maintain simultaneous connections with.";
leaf name {
type string;
description
"An arbitrary name for the RESTCONF server.";
}
container endpoints {
description
"Container for the list of endpoints.";
list endpoint {
key "name";
min-elements 1;
ordered-by user;
description
"A non-empty user-ordered list of endpoints for this
RESTCONF client to try to connect to in sequence.
Defining more than one enables high-availability.";
leaf name {
type string;
description
"An arbitrary name for this endpoint.";
}
uses restconf-client-initiate-stack-grouping;
}
}
container connection-type {
description
"Indicates the RESTCONF client's preference for how
the RESTCONF connection is maintained.";
choice connection-type {
mandatory true;
description
"Selects between available connection types.";
case persistent-connection {
container persistent {
presence "Indicates that a persistent connection
is to be maintained.";
description
"Maintain a persistent connection to the
RESTCONF server. If the connection goes down,
immediately start trying to reconnect to the

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RESTCONF server, using the reconnection strategy.

This connection type minimizes any RESTCONF server
to RESTCONF client data-transfer delay, albeit
at the expense of holding resources longer.";
}
}
case periodic-connection {
container periodic {
presence "Indicates that a periodic connection is
to be maintained.";
description
"Periodically connect to the RESTCONF server.

This connection type increases resource
utilization, albeit with increased delay
in RESTCONF server to RESTCONF client
interactions.

The RESTCONF client SHOULD gracefully close
the underlying TLS connection upon completing
planned activities.

In the case that the previous connection is
still active, establishing a new connection
is NOT RECOMMENDED.";
leaf period {
type uint16;
units "minutes";
default "60";
description
"Duration of time between periodic
connections.";
}
leaf anchor-time {
type yang:date-and-time {
// constrained to minute-level granularity
pattern '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}'
+ '(Z|[\+\-]\d{2}:\d{2})';
}
description
"Designates a timestamp before or after which
a series of periodic connections are
determined.  The periodic connections occur
at a whole multiple interval from the anchor
time.  For example, for an anchor time is 15
minutes past midnight and a period interval
of 24 hours, then a periodic connection will

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occur 15 minutes past midnight everyday.";
}
leaf idle-timeout {
type uint16;
units "seconds";
default 120; // two minutes
description
"Specifies the maximum number of seconds
that the underlying TCP session may remain
idle. A TCP session will be dropped if it
is idle for an interval longer than this
number of seconds If set to zero, then the
RESTCONF client will never drop a session
because it is idle.";
}
}
} // periodic-connection
} // connection-type
} // connection-type
container reconnect-strategy {
description
"The reconnection strategy directs how a RESTCONF
client reconnects to a RESTCONF server, after
discovering its connection to the server has
dropped, even if due to a reboot.  The RESTCONF
client starts with the specified endpoint and
tries to connect to it max-attempts times before
trying the next endpoint in the list (round
robin).";
leaf start-with {
type enumeration {
enum first-listed {
description
"Indicates that reconnections should start
with the first endpoint listed.";
}
enum last-connected {
description
"Indicates that reconnections should start
with the endpoint last connected to.  If
no previous connection has ever been
established, then the first endpoint
configured is used.   RESTCONF clients
SHOULD be able to remember the last
endpoint connected to across reboots.";
}
enum random-selection {
description

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a random endpoint.";
}
}
default "first-listed";
description
"Specifies which of the RESTCONF server's
endpoints the RESTCONF client should start
with when trying to connect to the RESTCONF
server.";
}
leaf max-attempts {
type uint8 {
range "1..max";
}
default "3";
description
"Specifies the number times the RESTCONF client
tries to connect to a specific endpoint before
moving on to the next endpoint in the list
(round robin).";
}
}
}
} // initiate
container listen {
if-feature "http-listen or https-listen";
presence "Enables client to accept call-home connections";
description
"Configures the client to accept call-home TCP connections.";
leaf idle-timeout {
type uint16;
units "seconds";
default 3600; // one hour
description
"Specifies the maximum number of seconds that an
underlying TCP session may remain idle. A TCP session
will be dropped if it is idle for an interval longer
then this number of seconds.  If set to zero, then
the server will never drop a session because it is
idle.  Sessions that have a notification subscription
active are never dropped.";
}
list endpoint {
key "name";
min-elements 1;
description
"List of endpoints to listen for RESTCONF connections.";

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leaf name {
type string;
description
"An arbitrary name for the RESTCONF listen endpoint.";
}
uses restconf-client-listen-stack-grouping;
}
}
} // restconf-client-app-grouping

// Protocol accessible node, for servers that implement
// this module.
container restconf-client {
uses restconf-client-app-grouping;
description
"Top-level container for RESTCONF client configuration.";
}
}

<CODE ENDS>

3.  The RESTCONF Server Model

The RESTCONF server model presented in this section supports both
listening for connections as well as initiating call-home
connections.

YANG feature statements are used to enable implementations to
advertise which potentially uncommon parts of the model the RESTCONF
server supports.

3.1.  Tree Diagram

The following tree diagram [RFC8340] provides an overview of the data
model for the "ietf-restconf-server" module.

This tree diagram only shows the nodes defined in this module; it
does show the nodes defined by "grouping" statements used by this
module.

Please see Appendix A.2 for a tree diagram that illustrates what the
module looks like with all the "grouping" statements expanded.

module: ietf-restconf-server
+--rw restconf-server
+---u restconf-server-app-grouping

grouping restconf-server-grouping

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+-- client-identity-mappings
+---u x509c2n:cert-to-name
grouping restconf-server-listen-stack-grouping
+-- (transport)
+--:(http) {http-listen}?
|  +-- http
|     +-- external-endpoint!
|     |  +-- port?      inet:port-number
|     +-- tcp-server-parameters
|     |  +---u tcps:tcp-server-grouping
|     +-- http-server-parameters
|     |  +---u https:http-server-grouping
|     +-- restconf-server-parameters
|        +---u rcs:restconf-server-grouping
+--:(https) {https-listen}?
+-- https
+-- tcp-server-parameters
|  +---u tcps:tcp-server-grouping
+-- tls-server-parameters
|  +---u tlss:tls-server-grouping
+-- http-server-parameters
|  +---u https:http-server-grouping
+-- restconf-server-parameters
+---u rcs:restconf-server-grouping
grouping restconf-server-callhome-stack-grouping
+-- (transport)
+--:(https) {https-listen}?
+-- https
+-- tcp-client-parameters
|  +---u tcpc:tcp-client-grouping
+-- tls-server-parameters
|  +---u tlss:tls-server-grouping
+-- http-server-parameters
|  +---u https:http-server-grouping
+-- restconf-server-parameters
+---u rcs:restconf-server-grouping
grouping restconf-server-app-grouping
+-- listen! {http-listen or https-listen}?
|  +-- endpoint* [name]
|     +-- name?                                    string
|     +---u restconf-server-listen-stack-grouping
+-- call-home! {https-call-home}?
+-- restconf-client* [name]
+-- name?                 string
+-- endpoints
|  +-- endpoint* [name]
|     +-- name?                                      string

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|     +---u restconf-server-callhome-stack-grouping
+-- connection-type
|  +-- (connection-type)
|     +--:(persistent-connection)
|     |  +-- persistent!
|     +--:(periodic-connection)
|        +-- periodic!
|           +-- period?         uint16
|           +-- anchor-time?    yang:date-and-time
|           +-- idle-timeout?   uint16
+-- reconnect-strategy
+-- start-with?     enumeration
+-- max-attempts?   uint8

3.2.  Example Usage

The following example illustrates configuring a RESTCONF server to
listen for RESTCONF client connections, as well as configuring call-
home to one RESTCONF client.

This example is 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].

========== NOTE: '\' line wrapping per BCP XXX (RFC XXXX) ===========

<restconf-server
xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf-server"
xmlns:ct="urn:ietf:params:xml:ns:yang:ietf-crypto-types"
xmlns:x509c2n="urn:ietf:params:xml:ns:yang:ietf-x509-cert-to-name">

<!-- endpoints to listen for RESTCONF connections on -->
<listen>
<endpoint>
<name>netconf/tls</name>
<https>
<tcp-server-parameters>
</tcp-server-parameters>
<tls-server-parameters>
<server-identity>
<certificate>
<local-definition>
<public-key-format>ct:subject-public-key-info-format\
</public-key-format>
<public-key>base64encodedvalue==</public-key>
<private-key-format>ct:rsa-private-key-format</priva\
te-key-format>

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<private-key>base64encodedvalue==</private-key>
<cert>base64encodedvalue==</cert>
</local-definition>
</certificate>
</server-identity>
<client-authentication>
<ca-certs>
<truststore-reference>trusted-client-ca-certs</trustst\
ore-reference>
</ca-certs>
<ee-certs>
<truststore-reference>trusted-client-ee-certs</trustst\
ore-reference>
</ee-certs>
</client-authentication>
<keepalives>
<peer-allowed-to-send/>
</keepalives>
</tls-server-parameters>
<http-server-parameters>
<server-name>foo.example.com</server-name>
</http-server-parameters>
<restconf-server-parameters>
<client-identity-mappings>
<cert-to-name>
<id>1</id>
<fingerprint>11:0A:05:11:00</fingerprint>
<map-type>x509c2n:specified</map-type>
<name>scooby-doo</name>
</cert-to-name>
<cert-to-name>
<id>2</id>
<map-type>x509c2n:san-any</map-type>
</cert-to-name>
</client-identity-mappings>
</restconf-server-parameters>
</https>
</endpoint>
</listen>

<!-- call home to a RESTCONF client with two endpoints -->
<call-home>
<restconf-client>
<name>config-manager</name>
<endpoints>
<endpoint>
<name>east-data-center</name>
<https>

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<tcp-client-parameters>
<keepalives>
<idle-time>15</idle-time>
<max-probes>3</max-probes>
<probe-interval>30</probe-interval>
</keepalives>
</tcp-client-parameters>
<tls-server-parameters>
<server-identity>
<certificate>
<local-definition>
<public-key-format>ct:subject-public-key-info-fo\
rmat</public-key-format>
<public-key>base64encodedvalue==</public-key>
<private-key-format>ct:rsa-private-key-format</p\
rivate-key-format>
<private-key>base64encodedvalue==</private-key>
<cert>base64encodedvalue==</cert>
</local-definition>
</certificate>
</server-identity>
<client-authentication>
<ca-certs>
<truststore-reference>trusted-client-ca-certs</tru\
ststore-reference>
</ca-certs>
<ee-certs>
<truststore-reference>trusted-client-ee-certs</tru\
ststore-reference>
</ee-certs>
</client-authentication>
<keepalives>
<test-peer-aliveness>
<max-wait>30</max-wait>
<max-attempts>3</max-attempts>
</test-peer-aliveness>
</keepalives>
</tls-server-parameters>
<http-server-parameters>
<server-name>foo.example.com</server-name>
</http-server-parameters>
<restconf-server-parameters>
<client-identity-mappings>
<cert-to-name>
<id>1</id>
<fingerprint>11:0A:05:11:00</fingerprint>
<map-type>x509c2n:specified</map-type>

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<name>scooby-doo</name>
</cert-to-name>
<cert-to-name>
<id>2</id>
<map-type>x509c2n:san-any</map-type>
</cert-to-name>
</client-identity-mappings>
</restconf-server-parameters>
</https>
</endpoint>
<endpoint>
<name>west-data-center</name>
<https>
<tcp-client-parameters>
<keepalives>
<idle-time>15</idle-time>
<max-probes>3</max-probes>
<probe-interval>30</probe-interval>
</keepalives>
</tcp-client-parameters>
<tls-server-parameters>
<server-identity>
<certificate>
<local-definition>
<public-key-format>ct:subject-public-key-info-fo\
rmat</public-key-format>
<public-key>base64encodedvalue==</public-key>
<private-key-format>ct:rsa-private-key-format</p\
rivate-key-format>
<private-key>base64encodedvalue==</private-key>
<cert>base64encodedvalue==</cert>
</local-definition>
</certificate>
</server-identity>
<client-authentication>
<ca-certs>
<truststore-reference>trusted-client-ca-certs</tru\
ststore-reference>
</ca-certs>
<ee-certs>
<truststore-reference>trusted-client-ee-certs</tru\
ststore-reference>
</ee-certs>
</client-authentication>
<keepalives>
<test-peer-aliveness>
<max-wait>30</max-wait>

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<max-attempts>3</max-attempts>
</test-peer-aliveness>
</keepalives>
</tls-server-parameters>
<http-server-parameters>
<server-name>foo.example.com</server-name>
</http-server-parameters>
<restconf-server-parameters>
<client-identity-mappings>
<cert-to-name>
<id>1</id>
<fingerprint>11:0A:05:11:00</fingerprint>
<map-type>x509c2n:specified</map-type>
<name>scooby-doo</name>
</cert-to-name>
<cert-to-name>
<id>2</id>
<map-type>x509c2n:san-any</map-type>
</cert-to-name>
</client-identity-mappings>
</restconf-server-parameters>
</https>
</endpoint>
</endpoints>
<connection-type>
<periodic>
<idle-timeout>300</idle-timeout>
<period>60</period>
</periodic>
</connection-type>
<reconnect-strategy>
<start-with>last-connected</start-with>
<max-attempts>3</max-attempts>
</reconnect-strategy>
</restconf-client>
</call-home>
</restconf-server>

3.3.  YANG Module

This YANG module has normative references to [RFC6991], [RFC7407],
[RFC8040], [RFC8071], [I-D.kwatsen-netconf-tcp-client-server],
[I-D.ietf-netconf-tls-client-server], and
[I-D.kwatsen-netconf-http-client-server].

<CODE BEGINS> file "ietf-restconf-server@2020-05-20.yang"

module ietf-restconf-server {

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yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-restconf-server";
prefix rcs;

import ietf-yang-types {
prefix yang;
reference
"RFC 6991: Common YANG Data Types";
}

import ietf-inet-types {
prefix inet;
reference
"RFC 6991: Common YANG Data Types";
}

import ietf-x509-cert-to-name {
prefix x509c2n;
reference
"RFC 7407: A YANG Data Model for SNMP Configuration";
}

import ietf-tcp-client {
prefix tcpc;
reference
"RFC DDDD: YANG Groupings for TCP Clients and TCP Servers";
}

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";
}

import ietf-http-server {
prefix https;
reference
"RFC GGGG: YANG Groupings for HTTP Clients and HTTP Servers";
}

organization
"IETF NETCONF (Network Configuration) Working Group";

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contact
"WG Web:   <http://datatracker.ietf.org/wg/netconf/>
WG List:  <mailto:netconf@ietf.org>
Author:   Kent Watsen <mailto:kent+ietf@watsen.net>
Author:   Gary Wu <mailto:garywu@cisco.com>
Author:   Juergen Schoenwaelder
<mailto:j.schoenwaelder@jacobs-university.de>";

description
"This module contains a collection of YANG definitions
for configuring RESTCONF servers.

Copyright (c) 2020 IETF Trust and the persons identified

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

This version of this YANG module is part of RFC IIII
(https://www.rfc-editor.org/info/rfcIIII); 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 2020-05-20 {
description
"Initial version";
reference
"RFC IIII: RESTCONF Client and Server Models";
}

// Features

feature http-listen {
description
"The 'http-listen' feature indicates that the RESTCONF server
supports opening a port to listen for incoming RESTCONF over
TPC client connections, whereby the TLS connections are
terminated by an external system.";

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reference
"RFC 8040: RESTCONF Protocol";
}

feature https-listen {
description
"The 'https-listen' feature indicates that the RESTCONF server
supports opening a port to listen for incoming RESTCONF over
TLS client connections, whereby the TLS connections are
terminated by the server itself.";
reference
"RFC 8040: RESTCONF Protocol";
}

feature https-call-home {
description
"The 'https-call-home' feature indicates that the RESTCONF
server supports initiating connections to RESTCONF clients.";
reference
"RFC 8071: NETCONF Call Home and RESTCONF Call Home";
}

// Groupings

grouping restconf-server-grouping {
description
"A reusable grouping for configuring a RESTCONF server
without any consideration for how underlying transport
sessions are established.

Note that this grouping uses a fairly typical descendent
node name such that a stack of 'uses' statements will
have name conflicts.  It is intended that the consuming
data model will resolve the issue by wrapping the 'uses'
statement in a container called, e.g.,
'restconf-server-parameters'.  This model purposely does
not do this itself so as to provide maximum flexibility
to consuming models.";

container client-identity-mappings {
description
"Specifies mappings through which RESTCONF client X.509
certificates are used to determine a RESTCONF username.
If no matching and valid cert-to-name list entry can be
found, then the RESTCONF server MUST close the connection,
and MUST NOT accept RESTCONF messages over it.";
reference

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"RFC 7407: A YANG Data Model for SNMP Configuration.";
uses x509c2n:cert-to-name {
refine "cert-to-name/fingerprint" {
mandatory false;
description
"A 'fingerprint' value does not need to be specified
when the 'cert-to-name' mapping is independent of
fingerprint matching.  A 'cert-to-name' having no
fingerprint value will match any client certificate
and therefore should only be present at the end of
the user-ordered 'cert-to-name' list.";
}
}
}
}

grouping restconf-server-listen-stack-grouping {
description
"A reusable grouping for configuring a RESTCONF server
'listen' protocol stack for a single connection.";
choice transport {
mandatory true;
description
"Selects between available transports. This is a
'choice' statement so as to support additional
transport options to be augmented in.";
case http {
if-feature "http-listen";
container http {
description
"Configures RESTCONF server stack assuming that
TLS-termination is handled externally.";
container external-endpoint {
presence
"Specifies configuration for an external endpoint.";
description
"Identifies contact information for the external
system that terminates connections before passing
them thru to this server (e.g., a network address
translator or a load balancer).  These values have
no effect on the local operation of this server, but
may be used by the application when needing to
inform other systems how to contact this server.";
mandatory true;
description
"The IP address or hostname of the external system

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that terminates incoming RESTCONF client
connections before forwarding them to this
server.";
}
leaf port {
type inet:port-number;
default "443";
description
"The port number that the external system listens
on for incoming RESTCONF client connections that
are forwarded to this server.  The default HTTPS
port (443) is used, as expected for a RESTCONF
connection.";
}
}
container tcp-server-parameters {
description
"A wrapper around the TCP server parameters
to avoid name collisions.";
uses tcps:tcp-server-grouping {
refine "local-port" {
default "80";
description
"The RESTCONF server will listen on the IANA-
assigned well-known port value for 'http'
(80) if no value is specified.";
}
}
}
container http-server-parameters {
description
"A wrapper around the HTTP server parameters
to avoid name collisions.";
uses https:http-server-grouping;
}
container restconf-server-parameters {
description
"A wrapper around the RESTCONF server parameters
to avoid name collisions.";
uses rcs:restconf-server-grouping;
}
}
}
case https {
if-feature "https-listen";
container https {
description
"Configures RESTCONF server stack assuming that

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TLS-termination is handled internally.";
container tcp-server-parameters {
description
"A wrapper around the TCP server parameters
to avoid name collisions.";
uses tcps:tcp-server-grouping {
refine "local-port" {
default "443";
description
"The RESTCONF server will listen on the IANA-
assigned well-known port value for 'https'
(443) if no value is specified.";
}
}
}
container tls-server-parameters {
description
"A wrapper around the TLS server parameters
to avoid name collisions.";
uses tlss:tls-server-grouping;
}
container http-server-parameters {
description
"A wrapper around the HTTP server parameters
to avoid name collisions.";
uses https:http-server-grouping;
}
container restconf-server-parameters {
description
"A wrapper around the RESTCONF server parameters
to avoid name collisions.";
uses rcs:restconf-server-grouping;
}
}
}
}
}

grouping restconf-server-callhome-stack-grouping {
description
"A reusable grouping for configuring a RESTCONF server
'call-home' protocol stack, for a single connection.";
choice transport {
mandatory true;
description
"Selects between available transports. This is a
'choice' statement so as to support additional
transport options to be augmented in.";

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case https {
if-feature "https-listen";
container https {
description
"Configures RESTCONF server stack assuming that
TLS-termination is handled internally.";
container tcp-client-parameters {
description
"A wrapper around the TCP client parameters
to avoid name collisions.";
uses tcpc:tcp-client-grouping {
refine "remote-port" {
default "4336";
description
"The RESTCONF server will attempt to
connect to the IANA-assigned well-known
port for 'restconf-ch-tls' (4336) if no
value is specified.";
}
}
}
container tls-server-parameters {
description
"A wrapper around the TLS server parameters
to avoid name collisions.";
uses tlss:tls-server-grouping;
}
container http-server-parameters {
description
"A wrapper around the HTTP server parameters
to avoid name collisions.";
uses https:http-server-grouping;
}
container restconf-server-parameters {
description
"A wrapper around the RESTCONF server parameters
to avoid name collisions.";
uses rcs:restconf-server-grouping;
}
}
}
}
}

grouping restconf-server-app-grouping {
description
"A reusable grouping for configuring a RESTCONF server

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application that supports both 'listen' and 'call-home'
protocol stacks for a multiplicity of connections.";
container listen {
if-feature "http-listen or https-listen";
presence
"Enables the RESTCONF server to listen for RESTCONF
client connections.";
description "Configures listen behavior";
list endpoint {
key "name";
min-elements 1;
description
"List of endpoints to listen for RESTCONF connections.";
leaf name {
type string;
description
"An arbitrary name for the RESTCONF listen endpoint.";
}
uses restconf-server-listen-stack-grouping;
}
}
container call-home {
if-feature "https-call-home";
presence
"Enables the RESTCONF server to initiate the underlying
transport connection to RESTCONF clients.";
description "Configures call-home behavior";
list restconf-client {
key "name";
min-elements 1;
description
"List of RESTCONF clients the RESTCONF server is to
maintain simultaneous call-home connections with.";
leaf name {
type string;
description
"An arbitrary name for the remote RESTCONF client.";
}
container endpoints {
description
"Container for the list of endpoints.";
list endpoint {
key "name";
min-elements 1;
ordered-by user;
description
"User-ordered list of endpoints for this RESTCONF
client.  Defining more than one enables high-

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availability.";
leaf name {
type string;
description
"An arbitrary name for this endpoint.";
}
uses restconf-server-callhome-stack-grouping;
}
}
container connection-type {
description
"Indicates the RESTCONF server's preference for how the
RESTCONF connection is maintained.";
choice connection-type {
mandatory true;
description
"Selects between available connection types.";
case persistent-connection {
container persistent {
presence "Indicates that a persistent connection is
to be maintained.";
description
"Maintain a persistent connection to the RESTCONF
client. If the connection goes down, immediately
start trying to reconnect to the RESTCONF server,
using the reconnection strategy.

This connection type minimizes any RESTCONF
client to RESTCONF server data-transfer delay,
albeit at the expense of holding resources
longer.";
}
}
case periodic-connection {
container periodic {
presence "Indicates that a periodic connection is
to be maintained.";
description
"Periodically connect to the RESTCONF client.

This connection type increases resource
utilization, albeit with increased delay in
RESTCONF client to RESTCONF client interactions.

The RESTCONF client SHOULD gracefully close
the underlying TLS connection upon completing
planned activities.  If the underlying TLS
connection is not closed gracefully, the

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RESTCONF server MUST immediately attempt
to reestablish the connection.

In the case that the previous connection is
still active (i.e., the RESTCONF client has not
closed it yet), establishing a new connection
is NOT RECOMMENDED.";

leaf period {
type uint16;
units "minutes";
default "60";
description
"Duration of time between periodic connections.";
}
leaf anchor-time {
type yang:date-and-time {
// constrained to minute-level granularity
pattern '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}'
+ '(Z|[\+\-]\d{2}:\d{2})';
}
description
"Designates a timestamp before or after which a
series of periodic connections are determined.
The periodic connections occur at a whole
multiple interval from the anchor time.  For
example, for an anchor time is 15 minutes past
midnight and a period interval of 24 hours, then
a periodic connection will occur 15 minutes past
midnight everyday.";
}
leaf idle-timeout {
type uint16;
units "seconds";
default 120; // two minutes
description
"Specifies the maximum number of seconds that
the underlying TCP session may remain idle.
A TCP session will be dropped if it is idle
for an interval longer than this number of
seconds.  If set to zero, then the server
will never drop a session because it is idle.";
}
}
}
}
}
container reconnect-strategy {

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description
"The reconnection strategy directs how a RESTCONF server
reconnects to a RESTCONF client after discovering its
connection to the client has dropped, even if due to a
reboot.  The RESTCONF server starts with the specified
endpoint and tries to connect to it max-attempts times
before trying the next endpoint in the list (round
robin).";
leaf start-with {
type enumeration {
enum first-listed {
description
the first endpoint listed.";
}
enum last-connected {
description
the endpoint last connected to.  If no previous
connection has ever been established, then the
first endpoint configured is used.   RESTCONF
servers SHOULD be able to remember the last
endpoint connected to across reboots.";
}
enum random-selection {
description
a random endpoint.";
}
}
default "first-listed";
description
"Specifies which of the RESTCONF client's endpoints
to connect to the RESTCONF client.";
}
leaf max-attempts {
type uint8 {
range "1..max";
}
default "3";
description
"Specifies the number times the RESTCONF server tries
to connect to a specific endpoint before moving on to
the next endpoint in the list (round robin).";
}
}
} // restconf-client

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} // call-home
} // restconf-server-app-grouping

// Protocol accessible node, for servers that implement
// this module.
container restconf-server {
uses restconf-server-app-grouping;
description
"Top-level container for RESTCONF server configuration.";
}

}

<CODE ENDS>

4.  Security Considerations

The YANG module defined in this document uses groupings defined in
[I-D.kwatsen-netconf-tcp-client-server],
[I-D.ietf-netconf-tls-client-server], and
Considerations section in those documents for concerns related those
groupings.

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, 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.

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).  Some of 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:

None of the subtrees or data nodes in the modules defined in this
document need to be protected from write operations.

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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 of the subtrees or data nodes in the modules defined in this
document need to be protected from read operations.

Some of the RPC operations in the YANG modules may be considered
sensitive or vulnerable in some network environments.  It is thus
operations and their sensitivity/vulnerability:

The modules defined in this document do not define any 'RPC' or
'action' statements.

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-restconf-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-restconf-server
Registrant Contact: The NETCONF WG of the IETF.
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 the
following registrations are requested:

name:         ietf-restconf-client
namespace:    urn:ietf:params:xml:ns:yang:ietf-restconf-client
prefix:       ncc
reference:    RFC IIII

name:         ietf-restconf-server
namespace:    urn:ietf:params:xml:ns:yang:ietf-restconf-server
prefix:       ncs
reference:    RFC IIII

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6.  References

6.1.  Normative References

[I-D.ietf-netconf-keystore]
Watsen, K., "A YANG Data Model for a Keystore", draft-
ietf-netconf-keystore-16 (work in progress), March 2020.

[I-D.ietf-netconf-tls-client-server]
Watsen, K., Wu, G., and L. Xia, "YANG Groupings for TLS
Clients and TLS Servers", draft-ietf-netconf-tls-client-
server-18 (work in progress), March 2020.

[I-D.kwatsen-netconf-http-client-server]
Watsen, K., "YANG Groupings for HTTP Clients and HTTP
Servers", draft-kwatsen-netconf-http-client-server-05
(work in progress), November 2019.

[I-D.kwatsen-netconf-tcp-client-server]
Watsen, K. and M. Scharf, "YANG Groupings for TCP Clients
and TCP Servers", draft-kwatsen-netconf-tcp-client-
server-02 (work in progress), April 2019.

[RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.

[RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
DOI 10.17487/RFC6020, October 2010,
<https://www.rfc-editor.org/info/rfc6020>.

[RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6991, DOI 10.17487/RFC6991, July 2013,
<https://www.rfc-editor.org/info/rfc6991>.

[RFC7407]  Bjorklund, M. and J. Schoenwaelder, "A YANG Data Model for
SNMP Configuration", RFC 7407, DOI 10.17487/RFC7407,
December 2014, <https://www.rfc-editor.org/info/rfc7407>.

[RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<https://www.rfc-editor.org/info/rfc7950>.

[RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
<https://www.rfc-editor.org/info/rfc8040>.

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[RFC8071]  Watsen, K., "NETCONF Call Home and RESTCONF Call Home",
RFC 8071, DOI 10.17487/RFC8071, February 2017,
<https://www.rfc-editor.org/info/rfc8071>.

[RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.

6.2.  Informative References

[I-D.ietf-netconf-trust-anchors]
Watsen, K., "A YANG Data Model for a Truststore", draft-
ietf-netconf-trust-anchors-09 (work in progress), March
2020.

[RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.

[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,
<https://www.rfc-editor.org/info/rfc6241>.

[RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.

[RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
Access Control Model", STD 91, RFC 8341,
DOI 10.17487/RFC8341, March 2018,
<https://www.rfc-editor.org/info/rfc8341>.

[RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
<https://www.rfc-editor.org/info/rfc8446>.

6.3.  URIs

[1] https://tools.ietf.org/html/draft-ietf-netconf-crypto-types

[2] https://tools.ietf.org/html/draft-ietf-netconf-trust-anchors

[3] https://tools.ietf.org/html/draft-ietf-netconf-keystore

[4] https://tools.ietf.org/html/draft-ietf-netconf-tcp-client-server

[5] https://tools.ietf.org/html/draft-ietf-netconf-ssh-client-server

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[6] https://tools.ietf.org/html/draft-ietf-netconf-tls-client-server

[7] https://tools.ietf.org/html/draft-ietf-netconf-http-client-server

[8] https://tools.ietf.org/html/draft-ietf-netconf-netconf-client-
server

[9] https://tools.ietf.org/html/draft-ietf-netconf-restconf-client-
server

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Appendix A.  Expanded Tree Diagrams

A.1.  Expanded Tree Diagram for 'ietf-restconf-client'

The following tree diagram [RFC8340] provides an overview of the data
model for the "ietf-restconf-client" module.

This tree diagram shows all the nodes defined in this module,
including those defined by "grouping" statements used by this module.

Please see Section 2.1 for a tree diagram that illustrates what the
module looks like without all the "grouping" statements expanded.

========== NOTE: '\\' line wrapping per BCP XXX (RFC XXXX) ==========

module: ietf-restconf-client
+--rw restconf-client
+--rw initiate! {https-initiate}?
|  +--rw restconf-server* [name]
|     +--rw name                  string
|     +--rw endpoints
|     |  +--rw endpoint* [name]
|     |     +--rw name           string
|     |     +--rw (transport)
|     |        +--:(https) {https-initiate}?
|     |           +--rw https
|     |              +--rw tcp-client-parameters
|     |              |  +--rw remote-address    inet:host
|     |              |  +--rw remote-port?      inet:port-number
|     |              |  |       {local-binding-supported}?
|     |              |  +--rw local-port?       inet:port-number
|     |              |  |       {local-binding-supported}?
|     |              |  +--rw keepalives!
|     |              |          {keepalives-supported}?
|     |              |     +--rw idle-time         uint16
|     |              |     +--rw max-probes        uint16
|     |              |     +--rw probe-interval    uint16
|     |              +--rw tls-client-parameters
|     |              |  +--rw client-identity
|     |              |  |  +--rw (auth-type)?
|     |              |  |     +--:(certificate)
|     |              |  |     |        {x509-certificate-auth}?
|     |              |  |     |  +--rw certificate
|     |              |  |     |     +--rw (local-or-keystore)
|     |              |  |     |        +--:(local)
|     |              |  |     |        |        {local-definiti\
\ons-supported}?

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|     |              |  |     |        |  +--rw local-definition
|     |              |  |     |        |     +--rw public-key-f\
\ormat
|     |              |  |     |        |     |       identityref
|     |              |  |     |        |     +--rw public-key
|     |              |  |     |        |     |       binary
|     |              |  |     |        |     +--rw private-key-\
\format?
|     |              |  |     |        |     |       identityref
|     |              |  |     |        |     +--rw (private-key\
\-type)
|     |              |  |     |        |     |  +--:(private-ke\
\y)
|     |              |  |     |        |     |  |  +--rw privat\
\e-key?
|     |              |  |     |        |     |  |          bina\
\ry
|     |              |  |     |        |     |  +--:(hidden-pri\
\vate-key)
|     |              |  |     |        |     |  |  +--rw hidden\
\-private-key?
|     |              |  |     |        |     |  |          empty
|     |              |  |     |        |     |  +--:(encrypted-\
\private-key)
|     |              |  |     |        |     |     +--rw encryp\
\ted-private-key
|     |              |  |     |        |     |        +--rw (ke\
\y-type)
|     |              |  |     |        |     |        |  +--:(s\
\ymmetric-key-ref)
|     |              |  |     |        |     |        |  |  +--\
\rw symmetric-key-ref?    leafref
|     |              |  |     |        |     |        |  |     \
\     {keystore-supported}?
|     |              |  |     |        |     |        |  +--:(a\
\symmetric-key-ref)
|     |              |  |     |        |     |        |     +--\
\rw asymmetric-key-ref?   leafref
|     |              |  |     |        |     |        |        \
\     {keystore-supported}?
|     |              |  |     |        |     |        +--rw val\
\ue?
|     |              |  |     |        |     |                b\
\inary
|     |              |  |     |        |     +--rw cert?
|     |              |  |     |        |     |       end-entity\
\-cert-cms
|     |              |  |     |        |     +---n certificate-\

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\expiration
|     |              |  |     |        |     |  +-- expiration-\
\date
|     |              |  |     |        |     |          yang:da\
\te-and-time
|     |              |  |     |        |     +---x generate-cer\
\tificate-signing-request
|     |              |  |     |        |             {certifica\
\te-signing-request-generation}?
|     |              |  |     |        |        +---w input
|     |              |  |     |        |        |  +---w subject
|     |              |  |     |        |        |  |       bina\
\ry
|     |              |  |     |        |        |  +---w attrib\
\utes?
|     |              |  |     |        |        |          bina\
\ry
|     |              |  |     |        |        +--ro output
|     |              |  |     |        |           +--ro certif\
\icate-signing-request
|     |              |  |     |        |                   ct:c\
\sr
|     |              |  |     |        +--:(keystore)
|     |              |  |     |                 {keystore-suppo\
\rted}?
|     |              |  |     |           +--rw keystore-refere\
\nce
|     |              |  |     |              +--rw asymmetric-k\
\ey?
|     |              |  |     |              |       ks:asymmet\
\ric-key-ref
|     |              |  |     |              +--rw certificate?\
\      leafref
|     |              |  |     +--:(raw-public-key)
|     |              |  |     |        {raw-public-key-auth}?
|     |              |  |     |  +--rw raw-private-key
|     |              |  |     |     +--rw (local-or-keystore)
|     |              |  |     |        +--:(local)
|     |              |  |     |        |        {local-definiti\
\ons-supported}?
|     |              |  |     |        |  +--rw local-definition
|     |              |  |     |        |     +--rw public-key-f\
\ormat
|     |              |  |     |        |     |       identityref
|     |              |  |     |        |     +--rw public-key
|     |              |  |     |        |     |       binary
|     |              |  |     |        |     +--rw private-key-\
\format?

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|     |              |  |     |        |     |       identityref
|     |              |  |     |        |     +--rw (private-key\
\-type)
|     |              |  |     |        |        +--:(private-ke\
\y)
|     |              |  |     |        |        |  +--rw privat\
\e-key?
|     |              |  |     |        |        |          bina\
\ry
|     |              |  |     |        |        +--:(hidden-pri\
\vate-key)
|     |              |  |     |        |        |  +--rw hidden\
\-private-key?
|     |              |  |     |        |        |          empty
|     |              |  |     |        |        +--:(encrypted-\
\private-key)
|     |              |  |     |        |           +--rw encryp\
\ted-private-key
|     |              |  |     |        |              +--rw (ke\
\y-type)
|     |              |  |     |        |              |  +--:(s\
\ymmetric-key-ref)
|     |              |  |     |        |              |  |  +--\
\rw symmetric-key-ref?    leafref
|     |              |  |     |        |              |  |     \
\     {keystore-supported}?
|     |              |  |     |        |              |  +--:(a\
\symmetric-key-ref)
|     |              |  |     |        |              |     +--\
\rw asymmetric-key-ref?   leafref
|     |              |  |     |        |              |        \
\     {keystore-supported}?
|     |              |  |     |        |              +--rw val\
\ue?
|     |              |  |     |        |                      b\
\inary
|     |              |  |     |        +--:(keystore)
|     |              |  |     |                 {keystore-suppo\
\rted}?
|     |              |  |     |           +--rw keystore-refere\
\nce?
|     |              |  |     |                   ks:asymmetric\
\-key-ref
|     |              |  |     +--:(psk) {psk-auth}?
|     |              |  |        +--rw psk
|     |              |  |           +--rw (local-or-keystore)
|     |              |  |              +--:(local)
|     |              |  |              |        {local-definiti\

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\ons-supported}?
|     |              |  |              |  +--rw local-definition
|     |              |  |              |     +--rw key-format?
|     |              |  |              |     |       identityref
|     |              |  |              |     +--rw (key-type)
|     |              |  |              |     |  +--:(key)
|     |              |  |              |     |  |  +--rw key?
|     |              |  |              |     |  |          bina\
\ry
|     |              |  |              |     |  +--:(hidden-key)
|     |              |  |              |     |  |  +--rw hidden\
\-key?
|     |              |  |              |     |  |          empty
|     |              |  |              |     |  +--:(encrypted-\
\key)
|     |              |  |              |     |     +--rw encryp\
\ted-key
|     |              |  |              |     |        +--rw (ke\
\y-type)
|     |              |  |              |     |        |  +--:(s\
\ymmetric-key-ref)
|     |              |  |              |     |        |  |  +--\
\rw symmetric-key-ref?    leafref
|     |              |  |              |     |        |  |     \
\     {keystore-supported}?
|     |              |  |              |     |        |  +--:(a\
\symmetric-key-ref)
|     |              |  |              |     |        |     +--\
\rw asymmetric-key-ref?   leafref
|     |              |  |              |     |        |        \
\     {keystore-supported}?
|     |              |  |              |     |        +--rw val\
\ue?
|     |              |  |              |     |                b\
\inary
|     |              |  |              |     +--rw id?
|     |              |  |              |             string
|     |              |  |              |             {ks:local-\
\definitions-supported}?
|     |              |  |              +--:(keystore)
|     |              |  |                       {keystore-suppo\
\rted}?
|     |              |  |                 +--rw keystore-refere\
\nce?
|     |              |  |                         ks:symmetric-\
\key-ref
|     |              |  +--rw server-authentication
|     |              |  |  +--rw ca-certs!

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Internet-Draft      RESTCONF Client and Server Models           May 2020

|     |              |  |  |       {x509-certificate-auth}?
|     |              |  |  |  +--rw (local-or-truststore)
|     |              |  |  |     +--:(local)
|     |              |  |  |     |        {local-definitions-su\
\pported}?
|     |              |  |  |     |  +--rw local-definition
|     |              |  |  |     |     +--rw cert*
|     |              |  |  |     |     |       trust-anchor-cer\
\t-cms
|     |              |  |  |     |     +---n certificate-expira\
\tion
|     |              |  |  |     |        +-- expiration-date
|     |              |  |  |     |                yang:date-and\
\-time
|     |              |  |  |     +--:(truststore)
|     |              |  |  |              {truststore-supported\
\,certificates}?
|     |              |  |  |        +--rw truststore-reference?
|     |              |  |  |                ts:certificate-bag-\
\ref
|     |              |  |  +--rw ee-certs!
|     |              |  |  |       {x509-certificate-auth}?
|     |              |  |  |  +--rw (local-or-truststore)
|     |              |  |  |     +--:(local)
|     |              |  |  |     |        {local-definitions-su\
\pported}?
|     |              |  |  |     |  +--rw local-definition
|     |              |  |  |     |     +--rw cert*
|     |              |  |  |     |     |       trust-anchor-cer\
\t-cms
|     |              |  |  |     |     +---n certificate-expira\
\tion
|     |              |  |  |     |        +-- expiration-date
|     |              |  |  |     |                yang:date-and\
\-time
|     |              |  |  |     +--:(truststore)
|     |              |  |  |              {truststore-supported\
\,certificates}?
|     |              |  |  |        +--rw truststore-reference?
|     |              |  |  |                ts:certificate-bag-\
\ref
|     |              |  |  +--rw raw-public-keys!
|     |              |  |  |       {raw-public-key-auth}?
|     |              |  |  |  +--rw (local-or-truststore)
|     |              |  |  |     +--:(local)
|     |              |  |  |     |        {local-definitions-su\
\pported}?
|     |              |  |  |     |  +--rw local-definition

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|     |              |  |  |     |     +--rw public-key* [name]
|     |              |  |  |     |        +--rw name
|     |              |  |  |     |        |       string
|     |              |  |  |     |        +--rw public-key-form\
\at
|     |              |  |  |     |        |       identityref
|     |              |  |  |     |        +--rw public-key
|     |              |  |  |     |                binary
|     |              |  |  |     +--:(truststore)
|     |              |  |  |              {truststore-supported\
\,public-keys}?
|     |              |  |  |        +--rw truststore-reference?
|     |              |  |  |                ts:public-key-bag-r\
\ef
|     |              |  |  +--rw psks! {psk-auth}?
|     |              |  +--rw hello-params
|     |              |  |       {tls-client-hello-params-config\
\}?
|     |              |  |  +--rw tls-versions
|     |              |  |  |  +--rw tls-version*   identityref
|     |              |  |  +--rw cipher-suites
|     |              |  |     +--rw cipher-suite*   identityref
|     |              |  +--rw keepalives
|     |              |          {tls-client-keepalives}?
|     |              |     +--rw peer-allowed-to-send?   empty
|     |              |     +--rw test-peer-aliveness!
|     |              |        +--rw max-wait?       uint16
|     |              |        +--rw max-attempts?   uint8
|     |              +--rw http-client-parameters
|     |              |  +--rw client-identity!
|     |              |  |  +--rw (auth-type)?
|     |              |  |     +--:(basic)
|     |              |  |        +--rw basic {basic-auth}?
|     |              |  |           +--rw user-id     string
|     |              |  |           +--rw password    string
|     |              |  +--rw proxy-server! {proxy-connect}?
|     |              |     +--rw tcp-client-parameters
|     |              |     |  +--rw remote-address    inet:host
|     |              |     |  +--rw remote-port?
|     |              |     |  |       inet:port-number
|     |              |     |  +--rw local-address?
|     |              |     |  |       inet:ip-address
|     |              |     |  |       {local-binding-supported}?
|     |              |     |  +--rw local-port?
|     |              |     |  |       inet:port-number
|     |              |     |  |       {local-binding-supported}?
|     |              |     |  +--rw keepalives!
|     |              |     |          {keepalives-supported}?

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Internet-Draft      RESTCONF Client and Server Models           May 2020

|     |              |     |     +--rw idle-time         uint16
|     |              |     |     +--rw max-probes        uint16
|     |              |     |     +--rw probe-interval    uint16
|     |              |     +--rw tls-client-parameters
|     |              |     |  +--rw client-identity
|     |              |     |  |  +--rw (auth-type)?
|     |              |     |  |     +--:(certificate)
|     |              |     |  |     |        {x509-certificate-\
\auth}?
|     |              |     |  |     |  +--rw certificate
|     |              |     |  |     |     +--rw (local-or-keyst\
\ore)
|     |              |     |  |     |        +--:(local)
|     |              |     |  |     |        |        {local-de\
\finitions-supported}?
|     |              |     |  |     |        |  +--rw local-def\
\inition
|     |              |     |  |     |        |     +--rw public\
\-key-format
|     |              |     |  |     |        |     |       iden\
\tityref
|     |              |     |  |     |        |     +--rw public\
\-key
|     |              |     |  |     |        |     |       bina\
\ry
|     |              |     |  |     |        |     +--rw privat\
\e-key-format?
|     |              |     |  |     |        |     |       iden\
\tityref
|     |              |     |  |     |        |     +--rw (priva\
\te-key-type)
|     |              |     |  |     |        |     |  +--:(priv\
\ate-key)
|     |              |     |  |     |        |     |  |  +--rw \
\private-key?
|     |              |     |  |     |        |     |  |        \
\  binary
|     |              |     |  |     |        |     |  +--:(hidd\
\en-private-key)
|     |              |     |  |     |        |     |  |  +--rw \
\hidden-private-key?
|     |              |     |  |     |        |     |  |        \
\  empty
|     |              |     |  |     |        |     |  +--:(encr\
\ypted-private-key)
|     |              |     |  |     |        |     |     +--rw \
\encrypted-private-key
|     |              |     |  |     |        |     |        +--\

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\rw (key-type)
|     |              |     |  |     |        |     |        |  \
\+--:(symmetric-key-ref)
|     |              |     |  |     |        |     |        |  \
\|  +--rw symmetric-key-ref?    leafref
|     |              |     |  |     |        |     |        |  \
\|          {keystore-supported}?
|     |              |     |  |     |        |     |        |  \
\+--:(asymmetric-key-ref)
|     |              |     |  |     |        |     |        |  \
\   +--rw asymmetric-key-ref?   leafref
|     |              |     |  |     |        |     |        |  \
\           {keystore-supported}?
|     |              |     |  |     |        |     |        +--\
\rw value?
|     |              |     |  |     |        |     |           \
\     binary
|     |              |     |  |     |        |     +--rw cert?
|     |              |     |  |     |        |     |       end-\
\entity-cert-cms
|     |              |     |  |     |        |     +---n certif\
\icate-expiration
|     |              |     |  |     |        |     |  +-- expir\
\ation-date
|     |              |     |  |     |        |     |          y\
\ang:date-and-time
|     |              |     |  |     |        |     +---x genera\
\te-certificate-signing-request
|     |              |     |  |     |        |             {cer\
\tificate-signing-request-generation}?
|     |              |     |  |     |        |        +---w inp\
\ut
|     |              |     |  |     |        |        |  +---w \
\subject
|     |              |     |  |     |        |        |  |     \
\  binary
|     |              |     |  |     |        |        |  +---w \
\attributes?
|     |              |     |  |     |        |        |        \
\  binary
|     |              |     |  |     |        |        +--ro out\
\put
|     |              |     |  |     |        |           +--ro \
\certificate-signing-request
|     |              |     |  |     |        |                 \
\  ct:csr
|     |              |     |  |     |        +--:(keystore)
|     |              |     |  |     |                 {keystore\

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\-supported}?
|     |              |     |  |     |           +--rw keystore-\
\reference
|     |              |     |  |     |              +--rw asymme\
\tric-key?
|     |              |     |  |     |              |       ks:a\
\symmetric-key-ref
|     |              |     |  |     |              +--rw certif\
\icate?      leafref
|     |              |     |  |     +--:(raw-public-key)
|     |              |     |  |     |        {raw-public-key-au\
\th}?
|     |              |     |  |     |  +--rw raw-private-key
|     |              |     |  |     |     +--rw (local-or-keyst\
\ore)
|     |              |     |  |     |        +--:(local)
|     |              |     |  |     |        |        {local-de\
\finitions-supported}?
|     |              |     |  |     |        |  +--rw local-def\
\inition
|     |              |     |  |     |        |     +--rw public\
\-key-format
|     |              |     |  |     |        |     |       iden\
\tityref
|     |              |     |  |     |        |     +--rw public\
\-key
|     |              |     |  |     |        |     |       bina\
\ry
|     |              |     |  |     |        |     +--rw privat\
\e-key-format?
|     |              |     |  |     |        |     |       iden\
\tityref
|     |              |     |  |     |        |     +--rw (priva\
\te-key-type)
|     |              |     |  |     |        |        +--:(priv\
\ate-key)
|     |              |     |  |     |        |        |  +--rw \
\private-key?
|     |              |     |  |     |        |        |        \
\  binary
|     |              |     |  |     |        |        +--:(hidd\
\en-private-key)
|     |              |     |  |     |        |        |  +--rw \
\hidden-private-key?
|     |              |     |  |     |        |        |        \
\  empty
|     |              |     |  |     |        |        +--:(encr\
\ypted-private-key)

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|     |              |     |  |     |        |           +--rw \
\encrypted-private-key
|     |              |     |  |     |        |              +--\
\rw (key-type)
|     |              |     |  |     |        |              |  \
\+--:(symmetric-key-ref)
|     |              |     |  |     |        |              |  \
\|  +--rw symmetric-key-ref?    leafref
|     |              |     |  |     |        |              |  \
\|          {keystore-supported}?
|     |              |     |  |     |        |              |  \
\+--:(asymmetric-key-ref)
|     |              |     |  |     |        |              |  \
\   +--rw asymmetric-key-ref?   leafref
|     |              |     |  |     |        |              |  \
\           {keystore-supported}?
|     |              |     |  |     |        |              +--\
\rw value?
|     |              |     |  |     |        |                 \
\     binary
|     |              |     |  |     |        +--:(keystore)
|     |              |     |  |     |                 {keystore\
\-supported}?
|     |              |     |  |     |           +--rw keystore-\
\reference?
|     |              |     |  |     |                   ks:asym\
\metric-key-ref
|     |              |     |  |     +--:(psk) {psk-auth}?
|     |              |     |  |        +--rw psk
|     |              |     |  |           +--rw (local-or-keyst\
\ore)
|     |              |     |  |              +--:(local)
|     |              |     |  |              |        {local-de\
\finitions-supported}?
|     |              |     |  |              |  +--rw local-def\
\inition
|     |              |     |  |              |     +--rw key-fo\
\rmat?
|     |              |     |  |              |     |       iden\
\tityref
|     |              |     |  |              |     +--rw (key-t\
\ype)
|     |              |     |  |              |     |  +--:(key)
|     |              |     |  |              |     |  |  +--rw \
\key?
|     |              |     |  |              |     |  |        \
\  binary
|     |              |     |  |              |     |  +--:(hidd\

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Internet-Draft      RESTCONF Client and Server Models           May 2020

\en-key)
|     |              |     |  |              |     |  |  +--rw \
\hidden-key?
|     |              |     |  |              |     |  |        \
\  empty
|     |              |     |  |              |     |  +--:(encr\
\ypted-key)
|     |              |     |  |              |     |     +--rw \
\encrypted-key
|     |              |     |  |              |     |        +--\
\rw (key-type)
|     |              |     |  |              |     |        |  \
\+--:(symmetric-key-ref)
|     |              |     |  |              |     |        |  \
\|  +--rw symmetric-key-ref?    leafref
|     |              |     |  |              |     |        |  \
\|          {keystore-supported}?
|     |              |     |  |              |     |        |  \
\+--:(asymmetric-key-ref)
|     |              |     |  |              |     |        |  \
\   +--rw asymmetric-key-ref?   leafref
|     |              |     |  |              |     |        |  \
\           {keystore-supported}?
|     |              |     |  |              |     |        +--\
\rw value?
|     |              |     |  |              |     |           \
\     binary
|     |              |     |  |              |     +--rw id?
|     |              |     |  |              |             stri\
\ng
|     |              |     |  |              |             {ks:\
\local-definitions-supported}?
|     |              |     |  |              +--:(keystore)
|     |              |     |  |                       {keystore\
\-supported}?
|     |              |     |  |                 +--rw keystore-\
\reference?
|     |              |     |  |                         ks:symm\
\etric-key-ref
|     |              |     |  +--rw server-authentication
|     |              |     |  |  +--rw ca-certs!
|     |              |     |  |  |       {x509-certificate-auth\
\}?
|     |              |     |  |  |  +--rw (local-or-truststore)
|     |              |     |  |  |     +--:(local)
|     |              |     |  |  |     |        {local-definiti\
\ons-supported}?
|     |              |     |  |  |     |  +--rw local-definition

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Internet-Draft      RESTCONF Client and Server Models           May 2020

|     |              |     |  |  |     |     +--rw cert*
|     |              |     |  |  |     |     |       trust-anch\
\or-cert-cms
|     |              |     |  |  |     |     +---n certificate-\
\expiration
|     |              |     |  |  |     |        +-- expiration-\
\date
|     |              |     |  |  |     |                yang:da\
\te-and-time
|     |              |     |  |  |     +--:(truststore)
|     |              |     |  |  |              {truststore-sup\
\ported,certificates}?
|     |              |     |  |  |        +--rw truststore-refe\
\rence?
|     |              |     |  |  |                ts:certificat\
\e-bag-ref
|     |              |     |  |  +--rw ee-certs!
|     |              |     |  |  |       {x509-certificate-auth\
\}?
|     |              |     |  |  |  +--rw (local-or-truststore)
|     |              |     |  |  |     +--:(local)
|     |              |     |  |  |     |        {local-definiti\
\ons-supported}?
|     |              |     |  |  |     |  +--rw local-definition
|     |              |     |  |  |     |     +--rw cert*
|     |              |     |  |  |     |     |       trust-anch\
\or-cert-cms
|     |              |     |  |  |     |     +---n certificate-\
\expiration
|     |              |     |  |  |     |        +-- expiration-\
\date
|     |              |     |  |  |     |                yang:da\
\te-and-time
|     |              |     |  |  |     +--:(truststore)
|     |              |     |  |  |              {truststore-sup\
\ported,certificates}?
|     |              |     |  |  |        +--rw truststore-refe\
\rence?
|     |              |     |  |  |                ts:certificat\
\e-bag-ref
|     |              |     |  |  +--rw raw-public-keys!
|     |              |     |  |  |       {raw-public-key-auth}?
|     |              |     |  |  |  +--rw (local-or-truststore)
|     |              |     |  |  |     +--:(local)
|     |              |     |  |  |     |        {local-definiti\
\ons-supported}?
|     |              |     |  |  |     |  +--rw local-definition
|     |              |     |  |  |     |     +--rw public-key*

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Internet-Draft      RESTCONF Client and Server Models           May 2020

|     |              |     |  |  |     |             [name]
|     |              |     |  |  |     |        +--rw name
|     |              |     |  |  |     |        |       string
|     |              |     |  |  |     |        +--rw public-ke\
\y-format
|     |              |     |  |  |     |        |       identit\
\yref
|     |              |     |  |  |     |        +--rw public-key
|     |              |     |  |  |     |                binary
|     |              |     |  |  |     +--:(truststore)
|     |              |     |  |  |              {truststore-sup\
\ported,public-keys}?
|     |              |     |  |  |        +--rw truststore-refe\
\rence?
|     |              |     |  |  |                ts:public-key\
\-bag-ref
|     |              |     |  |  +--rw psks! {psk-auth}?
|     |              |     |  +--rw hello-params
|     |              |     |  |       {tls-client-hello-params-\
\config}?
|     |              |     |  |  +--rw tls-versions
|     |              |     |  |  |  +--rw tls-version*
|     |              |     |  |  |          identityref
|     |              |     |  |  +--rw cipher-suites
|     |              |     |  |     +--rw cipher-suite*
|     |              |     |  |             identityref
|     |              |     |  +--rw keepalives
|     |              |     |          {tls-client-keepalives}?
|     |              |     |     +--rw peer-allowed-to-send?
|     |              |     |     |       empty
|     |              |     |     +--rw test-peer-aliveness!
|     |              |     |        +--rw max-wait?       uint16
|     |              |     |        +--rw max-attempts?   uint8
|     |              |     +--rw http-client-parameters
|     |              |        +--rw client-identity!
|     |              |           +--rw (auth-type)?
|     |              |              +--:(basic)
|     |              |                 +--rw basic {basic-auth}?
|     |              |                    +--rw user-id
|     |              |                    |       string
|     |              |                            string
|     |              +--rw restconf-client-parameters
|     +--rw connection-type
|     |  +--rw (connection-type)
|     |     +--:(persistent-connection)
|     |     |  +--rw persistent!
|     |     +--:(periodic-connection)

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Internet-Draft      RESTCONF Client and Server Models           May 2020

|     |        +--rw periodic!
|     |           +--rw period?         uint16
|     |           +--rw anchor-time?    yang:date-and-time
|     |           +--rw idle-timeout?   uint16
|     +--rw reconnect-strategy
|        +--rw start-with?     enumeration
|        +--rw max-attempts?   uint8
+--rw listen! {http-listen or https-listen}?
+--rw idle-timeout?   uint16
+--rw endpoint* [name]
+--rw name           string
+--rw (transport)
+--:(http) {http-listen}?
|  +--rw http
|     +--rw tcp-server-parameters
|     |  +--rw local-port?      inet:port-number
|     |  +--rw keepalives! {keepalives-supported}?
|     |     +--rw idle-time         uint16
|     |     +--rw max-probes        uint16
|     |     +--rw probe-interval    uint16
|     +--rw http-client-parameters
|     |  +--rw client-identity!
|     |  |  +--rw (auth-type)?
|     |  |     +--:(basic)
|     |  |        +--rw basic {basic-auth}?
|     |  |           +--rw user-id     string
|     |  |           +--rw password    string
|     |  +--rw proxy-server! {proxy-connect}?
|     |     +--rw tcp-client-parameters
|     |     |  +--rw remote-address    inet:host
|     |     |  +--rw remote-port?      inet:port-number
|     |     |  |       {local-binding-supported}?
|     |     |  +--rw local-port?       inet:port-number
|     |     |  |       {local-binding-supported}?
|     |     |  +--rw keepalives!
|     |     |          {keepalives-supported}?
|     |     |     +--rw idle-time         uint16
|     |     |     +--rw max-probes        uint16
|     |     |     +--rw probe-interval    uint16
|     |     +--rw tls-client-parameters
|     |     |  +--rw client-identity
|     |     |  |  +--rw (auth-type)?
|     |     |  |     +--:(certificate)
|     |     |  |     |        {x509-certificate-auth}?
|     |     |  |     |  +--rw certificate
|     |     |  |     |     +--rw (local-or-keystore)

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|     |     |  |     |        +--:(local)
|     |     |  |     |        |        {local-definiti\
\ons-supported}?
|     |     |  |     |        |  +--rw local-definition
|     |     |  |     |        |     +--rw public-key-f\
\ormat
|     |     |  |     |        |     |       identityref
|     |     |  |     |        |     +--rw public-key
|     |     |  |     |        |     |       binary
|     |     |  |     |        |     +--rw private-key-\
\format?
|     |     |  |     |        |     |       identityref
|     |     |  |     |        |     +--rw (private-key\
\-type)
|     |     |  |     |        |     |  +--:(private-ke\
\y)
|     |     |  |     |        |     |  |  +--rw privat\
\e-key?
|     |     |  |     |        |     |  |          bina\
\ry
|     |     |  |     |        |     |  +--:(hidden-pri\
\vate-key)
|     |     |  |     |        |     |  |  +--rw hidden\
\-private-key?
|     |     |  |     |        |     |  |          empty
|     |     |  |     |        |     |  +--:(encrypted-\
\private-key)
|     |     |  |     |        |     |     +--rw encryp\
\ted-private-key
|     |     |  |     |        |     |        +--rw (ke\
\y-type)
|     |     |  |     |        |     |        |  +--:(s\
\ymmetric-key-ref)
|     |     |  |     |        |     |        |  |  +--\
\rw symmetric-key-ref?    leafref
|     |     |  |     |        |     |        |  |     \
\     {keystore-supported}?
|     |     |  |     |        |     |        |  +--:(a\
\symmetric-key-ref)
|     |     |  |     |        |     |        |     +--\
\rw asymmetric-key-ref?   leafref
|     |     |  |     |        |     |        |        \
\     {keystore-supported}?
|     |     |  |     |        |     |        +--rw val\
\ue?
|     |     |  |     |        |     |                b\
\inary
|     |     |  |     |        |     +--rw cert?

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|     |     |  |     |        |     |       end-entity\
\-cert-cms
|     |     |  |     |        |     +---n certificate-\
\expiration
|     |     |  |     |        |     |  +-- expiration-\
\date
|     |     |  |     |        |     |          yang:da\
\te-and-time
|     |     |  |     |        |     +---x generate-cer\
\tificate-signing-request
|     |     |  |     |        |             {certifica\
\te-signing-request-generation}?
|     |     |  |     |        |        +---w input
|     |     |  |     |        |        |  +---w subject
|     |     |  |     |        |        |  |       bina\
\ry
|     |     |  |     |        |        |  +---w attrib\
\utes?
|     |     |  |     |        |        |          bina\
\ry
|     |     |  |     |        |        +--ro output
|     |     |  |     |        |           +--ro certif\
\icate-signing-request
|     |     |  |     |        |                   ct:c\
\sr
|     |     |  |     |        +--:(keystore)
|     |     |  |     |                 {keystore-suppo\
\rted}?
|     |     |  |     |           +--rw keystore-refere\
\nce
|     |     |  |     |              +--rw asymmetric-k\
\ey?
|     |     |  |     |              |       ks:asymmet\
\ric-key-ref
|     |     |  |     |              +--rw certificate?\
\      leafref
|     |     |  |     +--:(raw-public-key)
|     |     |  |     |        {raw-public-key-auth}?
|     |     |  |     |  +--rw raw-private-key
|     |     |  |     |     +--rw (local-or-keystore)
|     |     |  |     |        +--:(local)
|     |     |  |     |        |        {local-definiti\
\ons-supported}?
|     |     |  |     |        |  +--rw local-definition
|     |     |  |     |        |     +--rw public-key-f\
\ormat
|     |     |  |     |        |     |       identityref
|     |     |  |     |        |     +--rw public-key

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|     |     |  |     |        |     |       binary
|     |     |  |     |        |     +--rw private-key-\
\format?
|     |     |  |     |        |     |       identityref
|     |     |  |     |        |     +--rw (private-key\
\-type)
|     |     |  |     |        |        +--:(private-ke\
\y)
|     |     |  |     |        |        |  +--rw privat\
\e-key?
|     |     |  |     |        |        |          bina\
\ry
|     |     |  |     |        |        +--:(hidden-pri\
\vate-key)
|     |     |  |     |        |        |  +--rw hidden\
\-private-key?
|     |     |  |     |        |        |          empty
|     |     |  |     |        |        +--:(encrypted-\
\private-key)
|     |     |  |     |        |           +--rw encryp\
\ted-private-key
|     |     |  |     |        |              +--rw (ke\
\y-type)
|     |     |  |     |        |              |  +--:(s\
\ymmetric-key-ref)
|     |     |  |     |        |              |  |  +--\
\rw symmetric-key-ref?    leafref
|     |     |  |     |        |              |  |     \
\     {keystore-supported}?
|     |     |  |     |        |              |  +--:(a\
\symmetric-key-ref)
|     |     |  |     |        |              |     +--\
\rw asymmetric-key-ref?   leafref
|     |     |  |     |        |              |        \
\     {keystore-supported}?
|     |     |  |     |        |              +--rw val\
\ue?
|     |     |  |     |        |                      b\
\inary
|     |     |  |     |        +--:(keystore)
|     |     |  |     |                 {keystore-suppo\
\rted}?
|     |     |  |     |           +--rw keystore-refere\
\nce?
|     |     |  |     |                   ks:asymmetric\
\-key-ref
|     |     |  |     +--:(psk) {psk-auth}?
|     |     |  |        +--rw psk

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|     |     |  |           +--rw (local-or-keystore)
|     |     |  |              +--:(local)
|     |     |  |              |        {local-definiti\
\ons-supported}?
|     |     |  |              |  +--rw local-definition
|     |     |  |              |     +--rw key-format?
|     |     |  |              |     |       identityref
|     |     |  |              |     +--rw (key-type)
|     |     |  |              |     |  +--:(key)
|     |     |  |              |     |  |  +--rw key?
|     |     |  |              |     |  |          bina\
\ry
|     |     |  |              |     |  +--:(hidden-key)
|     |     |  |              |     |  |  +--rw hidden\
\-key?
|     |     |  |              |     |  |          empty
|     |     |  |              |     |  +--:(encrypted-\
\key)
|     |     |  |              |     |     +--rw encryp\
\ted-key
|     |     |  |              |     |        +--rw (ke\
\y-type)
|     |     |  |              |     |        |  +--:(s\
\ymmetric-key-ref)
|     |     |  |              |     |        |  |  +--\
\rw symmetric-key-ref?    leafref
|     |     |  |              |     |        |  |     \
\     {keystore-supported}?
|     |     |  |              |     |        |  +--:(a\
\symmetric-key-ref)
|     |     |  |              |     |        |     +--\
\rw asymmetric-key-ref?   leafref
|     |     |  |              |     |        |        \
\     {keystore-supported}?
|     |     |  |              |     |        +--rw val\
\ue?
|     |     |  |              |     |                b\
\inary
|     |     |  |              |     +--rw id?
|     |     |  |              |             string
|     |     |  |              |             {ks:local-\
\definitions-supported}?
|     |     |  |              +--:(keystore)
|     |     |  |                       {keystore-suppo\
\rted}?
|     |     |  |                 +--rw keystore-refere\
\nce?
|     |     |  |                         ks:symmetric-\

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\key-ref
|     |     |  +--rw server-authentication
|     |     |  |  +--rw ca-certs!
|     |     |  |  |       {x509-certificate-auth}?
|     |     |  |  |  +--rw (local-or-truststore)
|     |     |  |  |     +--:(local)
|     |     |  |  |     |        {local-definitions-su\
\pported}?
|     |     |  |  |     |  +--rw local-definition
|     |     |  |  |     |     +--rw cert*
|     |     |  |  |     |     |       trust-anchor-cer\
\t-cms
|     |     |  |  |     |     +---n certificate-expira\
\tion
|     |     |  |  |     |        +-- expiration-date
|     |     |  |  |     |                yang:date-and\
\-time
|     |     |  |  |     +--:(truststore)
|     |     |  |  |              {truststore-supported\
\,certificates}?
|     |     |  |  |        +--rw truststore-reference?
|     |     |  |  |                ts:certificate-bag-\
\ref
|     |     |  |  +--rw ee-certs!
|     |     |  |  |       {x509-certificate-auth}?
|     |     |  |  |  +--rw (local-or-truststore)
|     |     |  |  |     +--:(local)
|     |     |  |  |     |        {local-definitions-su\
\pported}?
|     |     |  |  |     |  +--rw local-definition
|     |     |  |  |     |     +--rw cert*
|     |     |  |  |     |     |       trust-anchor-cer\
\t-cms
|     |     |  |  |     |     +---n certificate-expira\
\tion
|     |     |  |  |     |        +-- expiration-date
|     |     |  |  |     |                yang:date-and\
\-time
|     |     |  |  |     +--:(truststore)
|     |     |  |  |              {truststore-supported\
\,certificates}?
|     |     |  |  |        +--rw truststore-reference?
|     |     |  |  |                ts:certificate-bag-\
\ref
|     |     |  |  +--rw raw-public-keys!
|     |     |  |  |       {raw-public-key-auth}?
|     |     |  |  |  +--rw (local-or-truststore)
|     |     |  |  |     +--:(local)

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|     |     |  |  |     |        {local-definitions-su\
\pported}?
|     |     |  |  |     |  +--rw local-definition
|     |     |  |  |     |     +--rw public-key* [name]
|     |     |  |  |     |        +--rw name
|     |     |  |  |     |        |       string
|     |     |  |  |     |        +--rw public-key-form\
\at
|     |     |  |  |     |        |       identityref
|     |     |  |  |     |        +--rw public-key
|     |     |  |  |     |                binary
|     |     |  |  |     +--:(truststore)
|     |     |  |  |              {truststore-supported\
\,public-keys}?
|     |     |  |  |        +--rw truststore-reference?
|     |     |  |  |                ts:public-key-bag-r\
\ef
|     |     |  |  +--rw psks! {psk-auth}?
|     |     |  +--rw hello-params
|     |     |  |       {tls-client-hello-params-config\
\}?
|     |     |  |  +--rw tls-versions
|     |     |  |  |  +--rw tls-version*   identityref
|     |     |  |  +--rw cipher-suites
|     |     |  |     +--rw cipher-suite*   identityref
|     |     |  +--rw keepalives
|     |     |          {tls-client-keepalives}?
|     |     |     +--rw peer-allowed-to-send?   empty
|     |     |     +--rw test-peer-aliveness!
|     |     |        +--rw max-wait?       uint16
|     |     |        +--rw max-attempts?   uint8
|     |     +--rw http-client-parameters
|     |        +--rw client-identity!
|     |           +--rw (auth-type)?
|     |              +--:(basic)
|     |                 +--rw basic {basic-auth}?
|     |                    +--rw user-id     string
|     +--rw restconf-client-parameters
+--:(https) {https-listen}?
+--rw https
+--rw tcp-server-parameters
|  +--rw local-port?      inet:port-number
|  +--rw keepalives! {keepalives-supported}?
|     +--rw idle-time         uint16
|     +--rw max-probes        uint16
|     +--rw probe-interval    uint16

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+--rw tls-client-parameters
|  +--rw client-identity
|  |  +--rw (auth-type)?
|  |     +--:(certificate)
|  |     |        {x509-certificate-auth}?
|  |     |  +--rw certificate
|  |     |     +--rw (local-or-keystore)
|  |     |        +--:(local)
|  |     |        |        {local-definitions-su\
\pported}?
|  |     |        |  +--rw local-definition
|  |     |        |     +--rw public-key-format
|  |     |        |     |       identityref
|  |     |        |     +--rw public-key
|  |     |        |     |       binary
|  |     |        |     +--rw private-key-format?
|  |     |        |     |       identityref
|  |     |        |     +--rw (private-key-type)
|  |     |        |     |  +--:(private-key)
|  |     |        |     |  |  +--rw private-key?
|  |     |        |     |  |          binary
|  |     |        |     |  +--:(hidden-private-k\
\ey)
|  |     |        |     |  |  +--rw hidden-priva\
\te-key?
|  |     |        |     |  |          empty
|  |     |        |     |  +--:(encrypted-privat\
\e-key)
|  |     |        |     |     +--rw encrypted-pr\
\ivate-key
|  |     |        |     |        +--rw (key-type)
|  |     |        |     |        |  +--:(symmetr\
\ic-key-ref)
|  |     |        |     |        |  |  +--rw sym\
\metric-key-ref?    leafref
|  |     |        |     |        |  |          {\
\keystore-supported}?
|  |     |        |     |        |  +--:(asymmet\
\ric-key-ref)
|  |     |        |     |        |     +--rw asy\
\mmetric-key-ref?   leafref
|  |     |        |     |        |             {\
\keystore-supported}?
|  |     |        |     |        +--rw value?
|  |     |        |     |                binary
|  |     |        |     +--rw cert?
|  |     |        |     |       end-entity-cert-\
\cms

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|  |     |        |     +---n certificate-expira\
\tion
|  |     |        |     |  +-- expiration-date
|  |     |        |     |          yang:date-and\
\-time
|  |     |        |     +---x generate-certifica\
\te-signing-request
|  |     |        |             {certificate-sig\
\ning-request-generation}?
|  |     |        |        +---w input
|  |     |        |        |  +---w subject
|  |     |        |        |  |       binary
|  |     |        |        |  +---w attributes?
|  |     |        |        |          binary
|  |     |        |        +--ro output
|  |     |        |           +--ro certificate-\
\signing-request
|  |     |        |                   ct:csr
|  |     |        +--:(keystore)
|  |     |                 {keystore-supported}?
|  |     |           +--rw keystore-reference
|  |     |              +--rw asymmetric-key?
|  |     |              |       ks:asymmetric-ke\
\y-ref
|  |     |              +--rw certificate?      \
\leafref
|  |     +--:(raw-public-key)
|  |     |        {raw-public-key-auth}?
|  |     |  +--rw raw-private-key
|  |     |     +--rw (local-or-keystore)
|  |     |        +--:(local)
|  |     |        |        {local-definitions-su\
\pported}?
|  |     |        |  +--rw local-definition
|  |     |        |     +--rw public-key-format
|  |     |        |     |       identityref
|  |     |        |     +--rw public-key
|  |     |        |     |       binary
|  |     |        |     +--rw private-key-format?
|  |     |        |     |       identityref
|  |     |        |     +--rw (private-key-type)
|  |     |        |        +--:(private-key)
|  |     |        |        |  +--rw private-key?
|  |     |        |        |          binary
|  |     |        |        +--:(hidden-private-k\
\ey)
|  |     |        |        |  +--rw hidden-priva\
\te-key?

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|  |     |        |        |          empty
|  |     |        |        +--:(encrypted-privat\
\e-key)
|  |     |        |           +--rw encrypted-pr\
\ivate-key
|  |     |        |              +--rw (key-type)
|  |     |        |              |  +--:(symmetr\
\ic-key-ref)
|  |     |        |              |  |  +--rw sym\
\metric-key-ref?    leafref
|  |     |        |              |  |          {\
\keystore-supported}?
|  |     |        |              |  +--:(asymmet\
\ric-key-ref)
|  |     |        |              |     +--rw asy\
\mmetric-key-ref?   leafref
|  |     |        |              |             {\
\keystore-supported}?
|  |     |        |              +--rw value?
|  |     |        |                      binary
|  |     |        +--:(keystore)
|  |     |                 {keystore-supported}?
|  |     |           +--rw keystore-reference?
|  |     |                   ks:asymmetric-key-r\
\ef
|  |     +--:(psk) {psk-auth}?
|  |        +--rw psk
|  |           +--rw (local-or-keystore)
|  |              +--:(local)
|  |              |        {local-definitions-su\
\pported}?
|  |              |  +--rw local-definition
|  |              |     +--rw key-format?
|  |              |     |       identityref
|  |              |     +--rw (key-type)
|  |              |     |  +--:(key)
|  |              |     |  |  +--rw key?
|  |              |     |  |          binary
|  |              |     |  +--:(hidden-key)
|  |              |     |  |  +--rw hidden-key?
|  |              |     |  |          empty
|  |              |     |  +--:(encrypted-key)
|  |              |     |     +--rw encrypted-key
|  |              |     |        +--rw (key-type)
|  |              |     |        |  +--:(symmetr\
\ic-key-ref)
|  |              |     |        |  |  +--rw sym\
\metric-key-ref?    leafref

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Internet-Draft      RESTCONF Client and Server Models           May 2020

|  |              |     |        |  |          {\
\keystore-supported}?
|  |              |     |        |  +--:(asymmet\
\ric-key-ref)
|  |              |     |        |     +--rw asy\
\mmetric-key-ref?   leafref
|  |              |     |        |             {\
\keystore-supported}?
|  |              |     |        +--rw value?
|  |              |     |                binary
|  |              |     +--rw id?
|  |              |             string
|  |              |             {ks:local-defini\
\tions-supported}?
|  |              +--:(keystore)
|  |                       {keystore-supported}?
|  |                 +--rw keystore-reference?
|  |                         ks:symmetric-key-ref
|  +--rw server-authentication
|  |  +--rw ca-certs! {x509-certificate-auth}?
|  |  |  +--rw (local-or-truststore)
|  |  |     +--:(local)
|  |  |     |        {local-definitions-supporte\
\d}?
|  |  |     |  +--rw local-definition
|  |  |     |     +--rw cert*
|  |  |     |     |       trust-anchor-cert-cms
|  |  |     |     +---n certificate-expiration
|  |  |     |        +-- expiration-date
|  |  |     |                yang:date-and-time
|  |  |     +--:(truststore)
|  |  |              {truststore-supported,certi\
\ficates}?
|  |  |        +--rw truststore-reference?
|  |  |                ts:certificate-bag-ref
|  |  +--rw ee-certs! {x509-certificate-auth}?
|  |  |  +--rw (local-or-truststore)
|  |  |     +--:(local)
|  |  |     |        {local-definitions-supporte\
\d}?
|  |  |     |  +--rw local-definition
|  |  |     |     +--rw cert*
|  |  |     |     |       trust-anchor-cert-cms
|  |  |     |     +---n certificate-expiration
|  |  |     |        +-- expiration-date
|  |  |     |                yang:date-and-time
|  |  |     +--:(truststore)
|  |  |              {truststore-supported,certi\

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Internet-Draft      RESTCONF Client and Server Models           May 2020

\ficates}?
|  |  |        +--rw truststore-reference?
|  |  |                ts:certificate-bag-ref
|  |  +--rw raw-public-keys!
|  |  |       {raw-public-key-auth}?
|  |  |  +--rw (local-or-truststore)
|  |  |     +--:(local)
|  |  |     |        {local-definitions-supporte\
\d}?
|  |  |     |  +--rw local-definition
|  |  |     |     +--rw public-key* [name]
|  |  |     |        +--rw name
|  |  |     |        |       string
|  |  |     |        +--rw public-key-format
|  |  |     |        |       identityref
|  |  |     |        +--rw public-key
|  |  |     |                binary
|  |  |     +--:(truststore)
|  |  |              {truststore-supported,publi\
\c-keys}?
|  |  |        +--rw truststore-reference?
|  |  |                ts:public-key-bag-ref
|  |  +--rw psks! {psk-auth}?
|  +--rw hello-params
|  |       {tls-client-hello-params-config}?
|  |  +--rw tls-versions
|  |  |  +--rw tls-version*   identityref
|  |  +--rw cipher-suites
|  |     +--rw cipher-suite*   identityref
|  +--rw keepalives {tls-client-keepalives}?
|     +--rw peer-allowed-to-send?   empty
|     +--rw test-peer-aliveness!
|        +--rw max-wait?       uint16
|        +--rw max-attempts?   uint8
+--rw http-client-parameters
|  +--rw client-identity!
|  |  +--rw (auth-type)?
|  |     +--:(basic)
|  |        +--rw basic {basic-auth}?
|  |           +--rw user-id     string
|  +--rw proxy-server! {proxy-connect}?
|     +--rw tcp-client-parameters
|     |  +--rw remote-port?      inet:port-number
|     |  |       {local-binding-supported}?
|     |  +--rw local-port?       inet:port-number

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|     |  |       {local-binding-supported}?
|     |  +--rw keepalives!
|     |          {keepalives-supported}?
|     |     +--rw idle-time         uint16
|     |     +--rw max-probes        uint16
|     |     +--rw probe-interval    uint16
|     +--rw tls-client-parameters
|     |  +--rw client-identity
|     |  |  +--rw (auth-type)?
|     |  |     +--:(certificate)
|     |  |     |        {x509-certificate-auth}?
|     |  |     |  +--rw certificate
|     |  |     |     +--rw (local-or-keystore)
|     |  |     |        +--:(local)
|     |  |     |        |        {local-definiti\
\ons-supported}?
|     |  |     |        |  +--rw local-definition
|     |  |     |        |     +--rw public-key-f\
\ormat
|     |  |     |        |     |       identityref
|     |  |     |        |     +--rw public-key
|     |  |     |        |     |       binary
|     |  |     |        |     +--rw private-key-\
\format?
|     |  |     |        |     |       identityref
|     |  |     |        |     +--rw (private-key\
\-type)
|     |  |     |        |     |  +--:(private-ke\
\y)
|     |  |     |        |     |  |  +--rw privat\
\e-key?
|     |  |     |        |     |  |          bina\
\ry
|     |  |     |        |     |  +--:(hidden-pri\
\vate-key)
|     |  |     |        |     |  |  +--rw hidden\
\-private-key?
|     |  |     |        |     |  |          empty
|     |  |     |        |     |  +--:(encrypted-\
\private-key)
|     |  |     |        |     |     +--rw encryp\
\ted-private-key
|     |  |     |        |     |        +--rw (ke\
\y-type)
|     |  |     |        |     |        |  +--:(s\
\ymmetric-key-ref)
|     |  |     |        |     |        |  |  +--\
\rw symmetric-key-ref?    leafref

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|     |  |     |        |     |        |  |     \
\     {keystore-supported}?
|     |  |     |        |     |        |  +--:(a\
\symmetric-key-ref)
|     |  |     |        |     |        |     +--\
\rw asymmetric-key-ref?   leafref
|     |  |     |        |     |        |        \
\     {keystore-supported}?
|     |  |     |        |     |        +--rw val\
\ue?
|     |  |     |        |     |                b\
\inary
|     |  |     |        |     +--rw cert?
|     |  |     |        |     |       end-entity\
\-cert-cms
|     |  |     |        |     +---n certificate-\
\expiration
|     |  |     |        |     |  +-- expiration-\
\date
|     |  |     |        |     |          yang:da\
\te-and-time
|     |  |     |        |     +---x generate-cer\
\tificate-signing-request
|     |  |     |        |             {certifica\
\te-signing-request-generation}?
|     |  |     |        |        +---w input
|     |  |     |        |        |  +---w subject
|     |  |     |        |        |  |       bina\
\ry
|     |  |     |        |        |  +---w attrib\
\utes?
|     |  |     |        |        |          bina\
\ry
|     |  |     |        |        +--ro output
|     |  |     |        |           +--ro certif\
\icate-signing-request
|     |  |     |        |                   ct:c\
\sr
|     |  |     |        +--:(keystore)
|     |  |     |                 {keystore-suppo\
\rted}?
|     |  |     |           +--rw keystore-refere\
\nce
|     |  |     |              +--rw asymmetric-k\
\ey?
|     |  |     |              |       ks:asymmet\
\ric-key-ref
|     |  |     |              +--rw certificate?\

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\      leafref
|     |  |     +--:(raw-public-key)
|     |  |     |        {raw-public-key-auth}?
|     |  |     |  +--rw raw-private-key
|     |  |     |     +--rw (local-or-keystore)
|     |  |     |        +--:(local)
|     |  |     |        |        {local-definiti\
\ons-supported}?
|     |  |     |        |  +--rw local-definition
|     |  |     |        |     +--rw public-key-f\
\ormat
|     |  |     |        |     |       identityref
|     |  |     |        |     +--rw public-key
|     |  |     |        |     |       binary
|     |  |     |        |     +--rw private-key-\
\format?
|     |  |     |        |     |       identityref
|     |  |     |        |     +--rw (private-key\
\-type)
|     |  |     |        |        +--:(private-ke\
\y)
|     |  |     |        |        |  +--rw privat\
\e-key?
|     |  |     |        |        |          bina\
\ry
|     |  |     |        |        +--:(hidden-pri\
\vate-key)
|     |  |     |        |        |  +--rw hidden\
\-private-key?
|     |  |     |        |        |          empty
|     |  |     |        |        +--:(encrypted-\
\private-key)
|     |  |     |        |           +--rw encryp\
\ted-private-key
|     |  |     |        |              +--rw (ke\
\y-type)
|     |  |     |        |              |  +--:(s\
\ymmetric-key-ref)
|     |  |     |        |              |  |  +--\
\rw symmetric-key-ref?    leafref
|     |  |     |        |              |  |     \
\     {keystore-supported}?
|     |  |     |        |              |  +--:(a\
\symmetric-key-ref)
|     |  |     |        |              |     +--\
\rw asymmetric-key-ref?   leafref
|     |  |     |        |              |        \
\     {keystore-supported}?

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|     |  |     |        |              +--rw val\
\ue?
|     |  |     |        |                      b\
\inary
|     |  |     |        +--:(keystore)
|     |  |     |                 {keystore-suppo\
\rted}?
|     |  |     |           +--rw keystore-refere\
\nce?
|     |  |     |                   ks:asymmetric\
\-key-ref
|     |  |     +--:(psk) {psk-auth}?
|     |  |        +--rw psk
|     |  |           +--rw (local-or-keystore)
|     |  |              +--:(local)
|     |  |              |        {local-definiti\
\ons-supported}?
|     |  |              |  +--rw local-definition
|     |  |              |     +--rw key-format?
|     |  |              |     |       identityref
|     |  |              |     +--rw (key-type)
|     |  |              |     |  +--:(key)
|     |  |              |     |  |  +--rw key?
|     |  |              |     |  |          bina\
\ry
|     |  |              |     |  +--:(hidden-key)
|     |  |              |     |  |  +--rw hidden\
\-key?
|     |  |              |     |  |          empty
|     |  |              |     |  +--:(encrypted-\
\key)
|     |  |              |     |     +--rw encryp\
\ted-key
|     |  |              |     |        +--rw (ke\
\y-type)
|     |  |              |     |        |  +--:(s\
\ymmetric-key-ref)
|     |  |              |     |        |  |  +--\
\rw symmetric-key-ref?    leafref
|     |  |              |     |        |  |     \
\     {keystore-supported}?
|     |  |              |     |        |  +--:(a\
\symmetric-key-ref)
|     |  |              |     |        |     +--\
\rw asymmetric-key-ref?   leafref
|     |  |              |     |        |        \
\     {keystore-supported}?
|     |  |              |     |        +--rw val\

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\ue?
|     |  |              |     |                b\
\inary
|     |  |              |     +--rw id?
|     |  |              |             string
|     |  |              |             {ks:local-\
\definitions-supported}?
|     |  |              +--:(keystore)
|     |  |                       {keystore-suppo\
\rted}?
|     |  |                 +--rw keystore-refere\
\nce?
|     |  |                         ks:symmetric-\
\key-ref
|     |  +--rw server-authentication
|     |  |  +--rw ca-certs!
|     |  |  |       {x509-certificate-auth}?
|     |  |  |  +--rw (local-or-truststore)
|     |  |  |     +--:(local)
|     |  |  |     |        {local-definitions-su\
\pported}?
|     |  |  |     |  +--rw local-definition
|     |  |  |     |     +--rw cert*
|     |  |  |     |     |       trust-anchor-cer\
\t-cms
|     |  |  |     |     +---n certificate-expira\
\tion
|     |  |  |     |        +-- expiration-date
|     |  |  |     |                yang:date-and\
\-time
|     |  |  |     +--:(truststore)
|     |  |  |              {truststore-supported\
\,certificates}?
|     |  |  |        +--rw truststore-reference?
|     |  |  |                ts:certificate-bag-\
\ref
|     |  |  +--rw ee-certs!
|     |  |  |       {x509-certificate-auth}?
|     |  |  |  +--rw (local-or-truststore)
|     |  |  |     +--:(local)
|     |  |  |     |        {local-definitions-su\
\pported}?
|     |  |  |     |  +--rw local-definition
|     |  |  |     |     +--rw cert*
|     |  |  |     |     |       trust-anchor-cer\
\t-cms
|     |  |  |     |     +---n certificate-expira\
\tion

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|     |  |  |     |        +-- expiration-date
|     |  |  |     |                yang:date-and\
\-time
|     |  |  |     +--:(truststore)
|     |  |  |              {truststore-supported\
\,certificates}?
|     |  |  |        +--rw truststore-reference?
|     |  |  |                ts:certificate-bag-\
\ref
|     |  |  +--rw raw-public-keys!
|     |  |  |       {raw-public-key-auth}?
|     |  |  |  +--rw (local-or-truststore)
|     |  |  |     +--:(local)
|     |  |  |     |        {local-definitions-su\
\pported}?
|     |  |  |     |  +--rw local-definition
|     |  |  |     |     +--rw public-key* [name]
|     |  |  |     |        +--rw name
|     |  |  |     |        |       string
|     |  |  |     |        +--rw public-key-form\
\at
|     |  |  |     |        |       identityref
|     |  |  |     |        +--rw public-key
|     |  |  |     |                binary
|     |  |  |     +--:(truststore)
|     |  |  |              {truststore-supported\
\,public-keys}?
|     |  |  |        +--rw truststore-reference?
|     |  |  |                ts:public-key-bag-r\
\ef
|     |  |  +--rw psks! {psk-auth}?
|     |  +--rw hello-params
|     |  |       {tls-client-hello-params-config\
\}?
|     |  |  +--rw tls-versions
|     |  |  |  +--rw tls-version*   identityref
|     |  |  +--rw cipher-suites
|     |  |     +--rw cipher-suite*   identityref
|     |  +--rw keepalives
|     |          {tls-client-keepalives}?
|     |     +--rw peer-allowed-to-send?   empty
|     |     +--rw test-peer-aliveness!
|     |        +--rw max-wait?       uint16
|     |        +--rw max-attempts?   uint8
|     +--rw http-client-parameters
|        +--rw client-identity!
|           +--rw (auth-type)?
|              +--:(basic)

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|                 +--rw basic {basic-auth}?
|                    +--rw user-id     string
+--rw restconf-client-parameters

A.2.  Expanded Tree Diagram for 'ietf-restconf-server'

The following tree diagram [RFC8340] provides an overview of the data
model for the "ietf-restconf-server" module.

This tree diagram shows all the nodes defined in this module,
including those defined by "grouping" statements used by this module.

Please see Section 3.1 for a tree diagram that illustrates what the
module looks like without all the "grouping" statements expanded.

========== NOTE: '\\' line wrapping per BCP XXX (RFC XXXX) ==========

module: ietf-restconf-server
+--rw restconf-server
+--rw listen! {http-listen or https-listen}?
|  +--rw endpoint* [name]
|     +--rw name           string
|     +--rw (transport)
|        +--:(http) {http-listen}?
|        |  +--rw http
|        |     +--rw external-endpoint!
|        |     |  +--rw port?      inet:port-number
|        |     +--rw tcp-server-parameters
|        |     |  +--rw local-port?      inet:port-number
|        |     |  +--rw keepalives! {keepalives-supported}?
|        |     |     +--rw idle-time         uint16
|        |     |     +--rw max-probes        uint16
|        |     |     +--rw probe-interval    uint16
|        |     +--rw http-server-parameters
|        |     |  +--rw server-name?             string
|        |     |  +--rw client-authentication!
|        |     |          {client-auth-config-supported}?
|        |     |     +--rw users
|        |     |        +--rw user* [user-id]
|        |     |           +--rw user-id        string
|        |     |           +--rw (auth-type)?
|        |     |              +--:(basic)
|        |     |                 +--rw basic {basic-auth}?
|        |     |                    +--rw user-id?    string

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|        |     |                            ianach:crypt-hash
|        |     +--rw restconf-server-parameters
|        |        +--rw client-identity-mappings
|        |           +--rw cert-to-name* [id]
|        |              +--rw id             uint32
|        |              +--rw fingerprint?
|        |              |       x509c2n:tls-fingerprint
|        |              +--rw map-type       identityref
|        |              +--rw name           string
|        +--:(https) {https-listen}?
|           +--rw https
|              +--rw tcp-server-parameters
|              |  +--rw local-port?      inet:port-number
|              |  +--rw keepalives! {keepalives-supported}?
|              |     +--rw idle-time         uint16
|              |     +--rw max-probes        uint16
|              |     +--rw probe-interval    uint16
|              +--rw tls-server-parameters
|              |  +--rw server-identity
|              |  |  +--rw (auth-type)
|              |  |     +--:(certificate)
|              |  |     |        {x509-certificate-auth}?
|              |  |     |  +--rw certificate
|              |  |     |     +--rw (local-or-keystore)
|              |  |     |        +--:(local)
|              |  |     |        |        {local-definitions-su\
\pported}?
|              |  |     |        |  +--rw local-definition
|              |  |     |        |     +--rw public-key-format
|              |  |     |        |     |       identityref
|              |  |     |        |     +--rw public-key
|              |  |     |        |     |       binary
|              |  |     |        |     +--rw private-key-format?
|              |  |     |        |     |       identityref
|              |  |     |        |     +--rw (private-key-type)
|              |  |     |        |     |  +--:(private-key)
|              |  |     |        |     |  |  +--rw private-key?
|              |  |     |        |     |  |          binary
|              |  |     |        |     |  +--:(hidden-private-k\
\ey)
|              |  |     |        |     |  |  +--rw hidden-priva\
\te-key?
|              |  |     |        |     |  |          empty
|              |  |     |        |     |  +--:(encrypted-privat\
\e-key)
|              |  |     |        |     |     +--rw encrypted-pr\
\ivate-key

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|              |  |     |        |     |        +--rw (key-type)
|              |  |     |        |     |        |  +--:(symmetr\
\ic-key-ref)
|              |  |     |        |     |        |  |  +--rw sym\
\metric-key-ref?    leafref
|              |  |     |        |     |        |  |          {\
\keystore-supported}?
|              |  |     |        |     |        |  +--:(asymmet\
\ric-key-ref)
|              |  |     |        |     |        |     +--rw asy\
\mmetric-key-ref?   leafref
|              |  |     |        |     |        |             {\
\keystore-supported}?
|              |  |     |        |     |        +--rw value?
|              |  |     |        |     |                binary
|              |  |     |        |     +--rw cert?
|              |  |     |        |     |       end-entity-cert-\
\cms
|              |  |     |        |     +---n certificate-expira\
\tion
|              |  |     |        |     |  +-- expiration-date
|              |  |     |        |     |          yang:date-and\
\-time
|              |  |     |        |     +---x generate-certifica\
\te-signing-request
|              |  |     |        |             {certificate-sig\
\ning-request-generation}?
|              |  |     |        |        +---w input
|              |  |     |        |        |  +---w subject
|              |  |     |        |        |  |       binary
|              |  |     |        |        |  +---w attributes?
|              |  |     |        |        |          binary
|              |  |     |        |        +--ro output
|              |  |     |        |           +--ro certificate-\
\signing-request
|              |  |     |        |                   ct:csr
|              |  |     |        +--:(keystore)
|              |  |     |                 {keystore-supported}?
|              |  |     |           +--rw keystore-reference
|              |  |     |              +--rw asymmetric-key?
|              |  |     |              |       ks:asymmetric-ke\
\y-ref
|              |  |     |              +--rw certificate?      \
\leafref
|              |  |     +--:(raw-private-key)
|              |  |     |        {raw-public-key-auth}?
|              |  |     |  +--rw raw-private-key
|              |  |     |     +--rw (local-or-keystore)

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|              |  |     |        +--:(local)
|              |  |     |        |        {local-definitions-su\
\pported}?
|              |  |     |        |  +--rw local-definition
|              |  |     |        |     +--rw public-key-format
|              |  |     |        |     |       identityref
|              |  |     |        |     +--rw public-key
|              |  |     |        |     |       binary
|              |  |     |        |     +--rw private-key-format?
|              |  |     |        |     |       identityref
|              |  |     |        |     +--rw (private-key-type)
|              |  |     |        |        +--:(private-key)
|              |  |     |        |        |  +--rw private-key?
|              |  |     |        |        |          binary
|              |  |     |        |        +--:(hidden-private-k\
\ey)
|              |  |     |        |        |  +--rw hidden-priva\
\te-key?
|              |  |     |        |        |          empty
|              |  |     |        |        +--:(encrypted-privat\
\e-key)
|              |  |     |        |           +--rw encrypted-pr\
\ivate-key
|              |  |     |        |              +--rw (key-type)
|              |  |     |        |              |  +--:(symmetr\
\ic-key-ref)
|              |  |     |        |              |  |  +--rw sym\
\metric-key-ref?    leafref
|              |  |     |        |              |  |          {\
\keystore-supported}?
|              |  |     |        |              |  +--:(asymmet\
\ric-key-ref)
|              |  |     |        |              |     +--rw asy\
\mmetric-key-ref?   leafref
|              |  |     |        |              |             {\
\keystore-supported}?
|              |  |     |        |              +--rw value?
|              |  |     |        |                      binary
|              |  |     |        +--:(keystore)
|              |  |     |                 {keystore-supported}?
|              |  |     |           +--rw keystore-reference?
|              |  |     |                   ks:asymmetric-key-r\
\ef
|              |  |     +--:(psk) {psk-auth}?
|              |  |        +--rw psk
|              |  |           +--rw (local-or-keystore)
|              |  |              +--:(local)
|              |  |              |        {local-definitions-su\

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\pported}?
|              |  |              |  +--rw local-definition
|              |  |              |     +--rw key-format?
|              |  |              |     |       identityref
|              |  |              |     +--rw (key-type)
|              |  |              |     |  +--:(key)
|              |  |              |     |  |  +--rw key?
|              |  |              |     |  |          binary
|              |  |              |     |  +--:(hidden-key)
|              |  |              |     |  |  +--rw hidden-key?
|              |  |              |     |  |          empty
|              |  |              |     |  +--:(encrypted-key)
|              |  |              |     |     +--rw encrypted-key
|              |  |              |     |        +--rw (key-type)
|              |  |              |     |        |  +--:(symmetr\
\ic-key-ref)
|              |  |              |     |        |  |  +--rw sym\
\metric-key-ref?    leafref
|              |  |              |     |        |  |          {\
\keystore-supported}?
|              |  |              |     |        |  +--:(asymmet\
\ric-key-ref)
|              |  |              |     |        |     +--rw asy\
\mmetric-key-ref?   leafref
|              |  |              |     |        |             {\
\keystore-supported}?
|              |  |              |     |        +--rw value?
|              |  |              |     |                binary
|              |  |              |     +--rw id?
|              |  |              |             string
|              |  |              |             {ks:local-defini\
\tions-supported}?
|              |  |              +--:(keystore)
|              |  |                       {keystore-supported}?
|              |  |                 +--rw keystore-reference?
|              |  |                         ks:symmetric-key-ref
|              |  +--rw client-authentication!
|              |  |       {client-auth-config-supported}?
|              |  |  +--rw ca-certs! {x509-certificate-auth}?
|              |  |  |  +--rw (local-or-truststore)
|              |  |  |     +--:(local)
|              |  |  |     |        {local-definitions-supporte\
\d}?
|              |  |  |     |  +--rw local-definition
|              |  |  |     |     +--rw cert*
|              |  |  |     |     |       trust-anchor-cert-cms
|              |  |  |     |     +---n certificate-expiration
|              |  |  |     |        +-- expiration-date

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|              |  |  |     |                yang:date-and-time
|              |  |  |     +--:(truststore)
|              |  |  |              {truststore-supported,certi\
\ficates}?
|              |  |  |        +--rw truststore-reference?
|              |  |  |                ts:certificate-bag-ref
|              |  |  +--rw ee-certs! {x509-certificate-auth}?
|              |  |  |  +--rw (local-or-truststore)
|              |  |  |     +--:(local)
|              |  |  |     |        {local-definitions-supporte\
\d}?
|              |  |  |     |  +--rw local-definition
|              |  |  |     |     +--rw cert*
|              |  |  |     |     |       trust-anchor-cert-cms
|              |  |  |     |     +---n certificate-expiration
|              |  |  |     |        +-- expiration-date
|              |  |  |     |                yang:date-and-time
|              |  |  |     +--:(truststore)
|              |  |  |              {truststore-supported,certi\
\ficates}?
|              |  |  |        +--rw truststore-reference?
|              |  |  |                ts:certificate-bag-ref
|              |  |  +--rw raw-public-keys!
|              |  |  |       {raw-public-key-auth}?
|              |  |  |  +--rw (local-or-truststore)
|              |  |  |     +--:(local)
|              |  |  |     |        {local-definitions-supporte\
\d}?
|              |  |  |     |  +--rw local-definition
|              |  |  |     |     +--rw public-key* [name]
|              |  |  |     |        +--rw name
|              |  |  |     |        |       string
|              |  |  |     |        +--rw public-key-format
|              |  |  |     |        |       identityref
|              |  |  |     |        +--rw public-key
|              |  |  |     |                binary
|              |  |  |     +--:(truststore)
|              |  |  |              {truststore-supported,publi\
\c-keys}?
|              |  |  |        +--rw truststore-reference?
|              |  |  |                ts:public-key-bag-ref
|              |  |  +--rw psks! {psk-auth}?
|              |  +--rw hello-params
|              |  |       {tls-server-hello-params-config}?
|              |  |  +--rw tls-versions
|              |  |  |  +--rw tls-version*   identityref
|              |  |  +--rw cipher-suites
|              |  |     +--rw cipher-suite*   identityref

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|              |  +--rw keepalives {tls-server-keepalives}?
|              |     +--rw peer-allowed-to-send?   empty
|              |     +--rw test-peer-aliveness!
|              |        +--rw max-wait?       uint16
|              |        +--rw max-attempts?   uint8
|              +--rw http-server-parameters
|              |  +--rw server-name?             string
|              |  +--rw client-authentication!
|              |          {client-auth-config-supported}?
|              |     +--rw users
|              |        +--rw user* [user-id]
|              |           +--rw user-id        string
|              |           +--rw (auth-type)?
|              |              +--:(basic)
|              |                 +--rw basic {basic-auth}?
|              |                    +--rw user-id?    string
|              |                            ianach:crypt-hash
|              +--rw restconf-server-parameters
|                 +--rw client-identity-mappings
|                    +--rw cert-to-name* [id]
|                       +--rw id             uint32
|                       +--rw fingerprint?
|                       |       x509c2n:tls-fingerprint
|                       +--rw map-type       identityref
|                       +--rw name           string
+--rw call-home! {https-call-home}?
+--rw restconf-client* [name]
+--rw name                  string
+--rw endpoints
|  +--rw endpoint* [name]
|     +--rw name           string
|     +--rw (transport)
|        +--:(https) {https-listen}?
|           +--rw https
|              +--rw tcp-client-parameters
|              |  +--rw remote-port?      inet:port-number
|              |  |       {local-binding-supported}?
|              |  +--rw local-port?       inet:port-number
|              |  |       {local-binding-supported}?
|              |  +--rw keepalives!
|              |          {keepalives-supported}?
|              |     +--rw idle-time         uint16
|              |     +--rw max-probes        uint16
|              |     +--rw probe-interval    uint16
|              +--rw tls-server-parameters

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|              |  +--rw server-identity
|              |  |  +--rw (auth-type)
|              |  |     +--:(certificate)
|              |  |     |        {x509-certificate-auth}?
|              |  |     |  +--rw certificate
|              |  |     |     +--rw (local-or-keystore)
|              |  |     |        +--:(local)
|              |  |     |        |        {local-definiti\
\ons-supported}?
|              |  |     |        |  +--rw local-definition
|              |  |     |        |     +--rw public-key-f\
\ormat
|              |  |     |        |     |       identityref
|              |  |     |        |     +--rw public-key
|              |  |     |        |     |       binary
|              |  |     |        |     +--rw private-key-\
\format?
|              |  |     |        |     |       identityref
|              |  |     |        |     +--rw (private-key\
\-type)
|              |  |     |        |     |  +--:(private-ke\
\y)
|              |  |     |        |     |  |  +--rw privat\
\e-key?
|              |  |     |        |     |  |          bina\
\ry
|              |  |     |        |     |  +--:(hidden-pri\
\vate-key)
|              |  |     |        |     |  |  +--rw hidden\
\-private-key?
|              |  |     |        |     |  |          empty
|              |  |     |        |     |  +--:(encrypted-\
\private-key)
|              |  |     |        |     |     +--rw encryp\
\ted-private-key
|              |  |     |        |     |        +--rw (ke\
\y-type)
|              |  |     |        |     |        |  +--:(s\
\ymmetric-key-ref)
|              |  |     |        |     |        |  |  +--\
\rw symmetric-key-ref?    leafref
|              |  |     |        |     |        |  |     \
\     {keystore-supported}?
|              |  |     |        |     |        |  +--:(a\
\symmetric-key-ref)
|              |  |     |        |     |        |     +--\
\rw asymmetric-key-ref?   leafref
|              |  |     |        |     |        |        \

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\     {keystore-supported}?
|              |  |     |        |     |        +--rw val\
\ue?
|              |  |     |        |     |                b\
\inary
|              |  |     |        |     +--rw cert?
|              |  |     |        |     |       end-entity\
\-cert-cms
|              |  |     |        |     +---n certificate-\
\expiration
|              |  |     |        |     |  +-- expiration-\
\date
|              |  |     |        |     |          yang:da\
\te-and-time
|              |  |     |        |     +---x generate-cer\
\tificate-signing-request
|              |  |     |        |             {certifica\
\te-signing-request-generation}?
|              |  |     |        |        +---w input
|              |  |     |        |        |  +---w subject
|              |  |     |        |        |  |       bina\
\ry
|              |  |     |        |        |  +---w attrib\
\utes?
|              |  |     |        |        |          bina\
\ry
|              |  |     |        |        +--ro output
|              |  |     |        |           +--ro certif\
\icate-signing-request
|              |  |     |        |                   ct:c\
\sr
|              |  |     |        +--:(keystore)
|              |  |     |                 {keystore-suppo\
\rted}?
|              |  |     |           +--rw keystore-refere\
\nce
|              |  |     |              +--rw asymmetric-k\
\ey?
|              |  |     |              |       ks:asymmet\
\ric-key-ref
|              |  |     |              +--rw certificate?\
\      leafref
|              |  |     +--:(raw-private-key)
|              |  |     |        {raw-public-key-auth}?
|              |  |     |  +--rw raw-private-key
|              |  |     |     +--rw (local-or-keystore)
|              |  |     |        +--:(local)
|              |  |     |        |        {local-definiti\

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\ons-supported}?
|              |  |     |        |  +--rw local-definition
|              |  |     |        |     +--rw public-key-f\
\ormat
|              |  |     |        |     |       identityref
|              |  |     |        |     +--rw public-key
|              |  |     |        |     |       binary
|              |  |     |        |     +--rw private-key-\
\format?
|              |  |     |        |     |       identityref
|              |  |     |        |     +--rw (private-key\
\-type)
|              |  |     |        |        +--:(private-ke\
\y)
|              |  |     |        |        |  +--rw privat\
\e-key?
|              |  |     |        |        |          bina\
\ry
|              |  |     |        |        +--:(hidden-pri\
\vate-key)
|              |  |     |        |        |  +--rw hidden\
\-private-key?
|              |  |     |        |        |          empty
|              |  |     |        |        +--:(encrypted-\
\private-key)
|              |  |     |        |           +--rw encryp\
\ted-private-key
|              |  |     |        |              +--rw (ke\
\y-type)
|              |  |     |        |              |  +--:(s\
\ymmetric-key-ref)
|              |  |     |        |              |  |  +--\
\rw symmetric-key-ref?    leafref
|              |  |     |        |              |  |     \
\     {keystore-supported}?
|              |  |     |        |              |  +--:(a\
\symmetric-key-ref)
|              |  |     |        |              |     +--\
\rw asymmetric-key-ref?   leafref
|              |  |     |        |              |        \
\     {keystore-supported}?
|              |  |     |        |              +--rw val\
\ue?
|              |  |     |        |                      b\
\inary
|              |  |     |        +--:(keystore)
|              |  |     |                 {keystore-suppo\
\rted}?

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|              |  |     |           +--rw keystore-refere\
\nce?
|              |  |     |                   ks:asymmetric\
\-key-ref
|              |  |     +--:(psk) {psk-auth}?
|              |  |        +--rw psk
|              |  |           +--rw (local-or-keystore)
|              |  |              +--:(local)
|              |  |              |        {local-definiti\
\ons-supported}?
|              |  |              |  +--rw local-definition
|              |  |              |     +--rw key-format?
|              |  |              |     |       identityref
|              |  |              |     +--rw (key-type)
|              |  |              |     |  +--:(key)
|              |  |              |     |  |  +--rw key?
|              |  |              |     |  |          bina\
\ry
|              |  |              |     |  +--:(hidden-key)
|              |  |              |     |  |  +--rw hidden\
\-key?
|              |  |              |     |  |          empty
|              |  |              |     |  +--:(encrypted-\
\key)
|              |  |              |     |     +--rw encryp\
\ted-key
|              |  |              |     |        +--rw (ke\
\y-type)
|              |  |              |     |        |  +--:(s\
\ymmetric-key-ref)
|              |  |              |     |        |  |  +--\
\rw symmetric-key-ref?    leafref
|              |  |              |     |        |  |     \
\     {keystore-supported}?
|              |  |              |     |        |  +--:(a\
\symmetric-key-ref)
|              |  |              |     |        |     +--\
\rw asymmetric-key-ref?   leafref
|              |  |              |     |        |        \
\     {keystore-supported}?
|              |  |              |     |        +--rw val\
\ue?
|              |  |              |     |                b\
\inary
|              |  |              |     +--rw id?
|              |  |              |             string
|              |  |              |             {ks:local-\
\definitions-supported}?

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|              |  |              +--:(keystore)
|              |  |                       {keystore-suppo\
\rted}?
|              |  |                 +--rw keystore-refere\
\nce?
|              |  |                         ks:symmetric-\
\key-ref
|              |  +--rw client-authentication!
|              |  |       {client-auth-config-supported}?
|              |  |  +--rw ca-certs!
|              |  |  |       {x509-certificate-auth}?
|              |  |  |  +--rw (local-or-truststore)
|              |  |  |     +--:(local)
|              |  |  |     |        {local-definitions-su\
\pported}?
|              |  |  |     |  +--rw local-definition
|              |  |  |     |     +--rw cert*
|              |  |  |     |     |       trust-anchor-cer\
\t-cms
|              |  |  |     |     +---n certificate-expira\
\tion
|              |  |  |     |        +-- expiration-date
|              |  |  |     |                yang:date-and\
\-time
|              |  |  |     +--:(truststore)
|              |  |  |              {truststore-supported\
\,certificates}?
|              |  |  |        +--rw truststore-reference?
|              |  |  |                ts:certificate-bag-\
\ref
|              |  |  +--rw ee-certs!
|              |  |  |       {x509-certificate-auth}?
|              |  |  |  +--rw (local-or-truststore)
|              |  |  |     +--:(local)
|              |  |  |     |        {local-definitions-su\
\pported}?
|              |  |  |     |  +--rw local-definition
|              |  |  |     |     +--rw cert*
|              |  |  |     |     |       trust-anchor-cer\
\t-cms
|              |  |  |     |     +---n certificate-expira\
\tion
|              |  |  |     |        +-- expiration-date
|              |  |  |     |                yang:date-and\
\-time
|              |  |  |     +--:(truststore)
|              |  |  |              {truststore-supported\
\,certificates}?

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|              |  |  |        +--rw truststore-reference?
|              |  |  |                ts:certificate-bag-\
\ref
|              |  |  +--rw raw-public-keys!
|              |  |  |       {raw-public-key-auth}?
|              |  |  |  +--rw (local-or-truststore)
|              |  |  |     +--:(local)
|              |  |  |     |        {local-definitions-su\
\pported}?
|              |  |  |     |  +--rw local-definition
|              |  |  |     |     +--rw public-key* [name]
|              |  |  |     |        +--rw name
|              |  |  |     |        |       string
|              |  |  |     |        +--rw public-key-form\
\at
|              |  |  |     |        |       identityref
|              |  |  |     |        +--rw public-key
|              |  |  |     |                binary
|              |  |  |     +--:(truststore)
|              |  |  |              {truststore-supported\
\,public-keys}?
|              |  |  |        +--rw truststore-reference?
|              |  |  |                ts:public-key-bag-r\
\ef
|              |  |  +--rw psks! {psk-auth}?
|              |  +--rw hello-params
|              |  |       {tls-server-hello-params-config\
\}?
|              |  |  +--rw tls-versions
|              |  |  |  +--rw tls-version*   identityref
|              |  |  +--rw cipher-suites
|              |  |     +--rw cipher-suite*   identityref
|              |  +--rw keepalives
|              |          {tls-server-keepalives}?
|              |     +--rw peer-allowed-to-send?   empty
|              |     +--rw test-peer-aliveness!
|              |        +--rw max-wait?       uint16
|              |        +--rw max-attempts?   uint8
|              +--rw http-server-parameters
|              |  +--rw server-name?             string
|              |  +--rw client-authentication!
|              |          {client-auth-config-supported}?
|              |     +--rw users
|              |        +--rw user* [user-id]
|              |           +--rw user-id        string
|              |           +--rw (auth-type)?
|              |              +--:(basic)
|              |                 +--rw basic {basic-auth}?

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|              |                    +--rw user-id?
|              |                    |       string
|              |                            ianach:crypt-\
\hash
|              +--rw restconf-server-parameters
|                 +--rw client-identity-mappings
|                    +--rw cert-to-name* [id]
|                       +--rw id             uint32
|                       +--rw fingerprint?
|                       |       x509c2n:tls-fingerprint
|                       +--rw map-type       identityref
|                       +--rw name           string
+--rw connection-type
|  +--rw (connection-type)
|     +--:(persistent-connection)
|     |  +--rw persistent!
|     +--:(periodic-connection)
|        +--rw periodic!
|           +--rw period?         uint16
|           +--rw anchor-time?    yang:date-and-time
|           +--rw idle-timeout?   uint16
+--rw reconnect-strategy
+--rw start-with?     enumeration
+--rw max-attempts?   uint8

Appendix B.  Change Log

B.1.  00 to 01

o  Renamed "keychain" to "keystore".

B.2.  01 to 02

o  Filled in previously missing 'ietf-restconf-client' module.

o  Updated the ietf-restconf-server module to accommodate new
grouping 'ietf-tls-server-grouping'.

B.3.  02 to 03

o  Refined use of tls-client-grouping to add a must statement
indicating that the TLS client must specify a client-certificate.

o  Changed restconf-client??? to be a grouping (not a container).

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B.4.  03 to 04

o  Added RFC 8174 to Requirements Language Section.

o  Replaced refine statement in ietf-restconf-client to add a
mandatory true.

statement.

o  Now there are containers and groupings, for both the client and
server models.

o  Now tree diagrams reference ietf-netmod-yang-tree-diagrams

o  Updated examples to inline key and certificates (no longer a
leafref to keystore)

B.5.  04 to 05

o  Now tree diagrams reference ietf-netmod-yang-tree-diagrams

o  Updated examples to inline key and certificates (no longer a
leafref to keystore)

B.6.  05 to 06

o  Fixed change log missing section issue.

o  Updated examples to match latest updates to the crypto-types,
trust-anchors, and keystore drafts.

o  Reduced line length of the YANG modules to fit within 69 columns.

B.7.  06 to 07

o  removed "idle-timeout" from "persistent" connection config.

o  Added "random-selection" for reconnection-strategy's "starts-with"
enum.

o  Replaced "connection-type" choice default (persistent) with
"mandatory true".

o  Reduced the periodic-connection's "idle-timeout" from 5 to 2
minutes.

o  Replaced reconnect-timeout with period/anchor-time combo.

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B.8.  07 to 08

o  Modified examples to be compatible with new crypto-types algs

B.9.  08 to 09

o  Corrected use of "mandatory true" for "address" leafs.

o  Updated examples to reflect update to groupings defined in the
keystore draft.

o  Updated to use groupings defined in new TCP and HTTP drafts.

o  Updated copyright date, boilerplate template, affiliation, and
folding algorithm.

B.10.  09 to 10

o  Reformatted YANG modules.

B.11.  10 to 11

imported from other modules.

o  Added "must" expressions to ensure that keepalives are not
configured for "periodic" connections.

o  Updated the boilerplate text in module-level "description"
statement to match copyeditor convention.

o  Moved "expanded" tree diagrams to the Appendix.

B.12.  11 to 12

o  Removed the 'must' statement limiting keepalives in periodic
connections.

o  Updated models and examples to reflect removal of the "demux"
containers in the imported models.

o  Updated the "periodic-connnection" description statements to
better describe behavior when connections are not closed
gracefully.

o  Updated text to better reference where certain examples come from
(e.g., which Section in which draft).

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o  In the server model, commented out the "must 'pinned-ca-certs or
pinned-client-certs'" statement to reflect change made in the TLS
draft whereby the trust anchors MAY be defined externally.

o  Replaced the 'listen', 'initiate', and 'call-home' features with
boolean expressions.

B.13.  12 to 13

o  Updated to reflect changes in trust-anchors drafts (e.g., s/trust-
anchors/truststore/g + s/pinned.//)

o  In ietf-restconf-server, Added 'http-listen' (not https-listen)
choice, to support case when server is behind a TLS-terminator.

o  Refactored server module to be more like other 'server' models.
If folks like it, will also apply to the client model, as well as
to both the netconf client/server models.  Now the 'restconf-
server-grouping' is just the RC-specific bits (i.e., the "demux"
container minus the container), 'restconf-server-
[listen|callhome]-stack-grouping' is the protocol stack for a
single connection, and 'restconf-server-app-grouping' is
effectively what was before (both listen+callhome for many
inbound/outbound endpoints).

B.14.  13 to 14

o  Updated examples to reflect ietf-crypto-types change (e.g.,
identities --> enumerations)

o  Adjusting from change in TLS client model (removing the top-level
'certificate' container).

o  Added "external-endpoint" to the "http-listen" choice in ietf-
restconf-server.

B.15.  14 to 15

o  Added missing "or https-listen" clause in a "must" expression.

o  Refactored the client module similar to how the server module was
refactored in -13.  Now the 'restconf-client-grouping' is just the
RC-specific bits, the 'restconf-client-[initiate|listen]-stack-
grouping' is the protocol stack for a single connection, and
'restconf-client-app-grouping' is effectively what was before
(both listen+callhome for many inbound/outbound endpoints).

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B.16.  15 to 16

o  Added refinement to make "cert-to-name/fingerprint" be mandatory
false.

o  Commented out refinement to "tls-server-grouping/client-
authentication" until a better "must" expression is defined.

o  Updated restconf-client example to reflect that http-client-
grouping no longer has a "protocol-version" leaf.

B.17.  16 to 17

o  Updated examples to include the "*-key-format" nodes.

o  Updated examples to remove the "required" nodes.

B.18.  17 to 18

o  Updated examples to reflect new "bag" addition to truststore.

B.19.  18 to 19

o  Updated examples to remove the 'algorithm' nodes.

o  Updated examples to reflect the new TLS keepalives structure.

o  Removed the 'protocol-versions' node from the restconf-server
examples.

o  Added a "Note to Reviewers" note to first page.

Acknowledgements

The authors would like to thank for following for lively discussions
on list and in the halls (ordered by last name): Andy Bierman, Martin
Bjorklund, Benoit Claise, Mehmet Ersue, Ramkumar Dhanapal, Balazs
Tom Petch, Juergen Schoenwaelder, Phil Shafer, Sean Turner, Bert
Wijnen.