| Internet-Draft | RESTCONF Client and Server Models | February 2024 |
| Watsen | Expires 25 August 2024 | [Page] |
This document presents 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.¶
This draft contains placeholder values that need to be replaced with finalized values at the time of publication. This note summarizes all of the substitutions that are needed. No other RFC Editor instructions are specified elsewhere in this document.¶
Artwork in this document contains shorthand references to drafts in progress. Please apply the following replacements (note: not all may be present):¶
AAAA --> the assigned RFC value for draft-ietf-netconf-crypto-types¶
BBBB --> the assigned RFC value for draft-ietf-netconf-trust-anchors¶
CCCC --> the assigned RFC value for draft-ietf-netconf-keystore¶
DDDD --> the assigned RFC value for draft-ietf-netconf-tcp-client-server¶
EEEE --> the assigned RFC value for draft-ietf-netconf-ssh-client-server¶
FFFF --> the assigned RFC value for draft-ietf-netconf-tls-client-server¶
GGGG --> the assigned RFC value for draft-ietf-netconf-http-client-server¶
HHHH --> the assigned RFC value for draft-ietf-netconf-netconf-client-server¶
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:¶
2024-02-22 --> the publication date of this draft¶
The "Relation to other RFCs" section Section 1.1 contains the text "one or more YANG modules" and, later, "modules". This text is sourced from a file in a context where it is unknown how many modules a draft defines. The text is not wrong as is, but it may be improved by stating more directly how many modules are defined.¶
The "Relation to other RFCs" section Section 1.1 contains a self-reference to this draft, along with a corresponding reference in the Appendix. Please replace the self-reference in this section with "This RFC" (or similar) and remove the self-reference in the "Normative/Informative References" section, whichever it is in.¶
Tree-diagrams in this draft may use the '\' line-folding mode defined in RFC 8792. However, nicer-to-the-eye is when the '\\' line-folding mode is used. The AD suggested suggested putting a request here for the RFC Editor to help convert "ugly" '\' folded examples to use the '\\' folding mode. "Help convert" may be interpreted as, identify what looks ugly and ask the authors to make the adjustment.¶
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Copyright (c) 2024 IETF Trust and the persons identified as the document authors. All rights reserved.¶
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This document presents 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].¶
This document presents one or more YANG modules [RFC7950] that are part of a collection of RFCs that work together to, ultimately, support the configuration of both the clients and servers of both the NETCONF [RFC6241] and RESTCONF [RFC8040] protocols.¶
The dependency relationship between the primary YANG groupings defined in the various RFCs is presented in the below diagram. In some cases, a draft may define secondary groupings that introduce dependencies not illustrated in the diagram. The labels in the diagram are a shorthand name for the defining RFC. The citation reference for shorthand name is provided below the diagram.¶
Please note that the arrows in the diagram point from referencer to referenced. For example, the "crypto-types" RFC does not have any dependencies, whilst the "keystore" RFC depends on the "crypto-types" RFC.¶
crypto-types
^ ^
/ \
/ \
truststore keystore
^ ^ ^ ^
| +---------+ | |
| | | |
| +------------+ |
tcp-client-server | / | |
^ ^ ssh-client-server | |
| | ^ tls-client-server
| | | ^ ^ http-client-server
| | | | | ^
| | | +-----+ +---------+ |
| | | | | |
| +-----------|--------|--------------+ | |
| | | | | |
+-----------+ | | | | |
| | | | | |
| | | | | |
netconf-client-server restconf-client-server
¶
| Label in Diagram | Originating RFC |
|---|---|
| crypto-types | [I-D.ietf-netconf-crypto-types] |
| truststore | [I-D.ietf-netconf-trust-anchors] |
| keystore | [I-D.ietf-netconf-keystore] |
| tcp-client-server | [I-D.ietf-netconf-tcp-client-server] |
| ssh-client-server | [I-D.ietf-netconf-ssh-client-server] |
| tls-client-server | [I-D.ietf-netconf-tls-client-server] |
| http-client-server | [I-D.ietf-netconf-http-client-server] |
| netconf-client-server | [I-D.ietf-netconf-netconf-client-server] |
| restconf-client-server | [I-D.ietf-netconf-restconf-client-server] |
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.¶
This document is compliant with the Network Management Datastore Architecture (NMDA) [RFC8342]. For instance, as described in [I-D.ietf-netconf-trust-anchors] and [I-D.ietf-netconf-keystore], trust anchors and keys installed during manufacturing are expected to appear in <operational> (Section 5.3 of [RFC8342]), and <system> [I-D.ietf-netmod-system-config], if implemented.¶
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.¶
This section provides an overview of the "ietf-restconf-client" module in terms of its features and groupings.¶
The following diagram lists all the "feature" statements defined in the "ietf-restconf-client" module:¶
Features: +-- https-initiate +-- http-listen +-- https-listen +-- central-restconf-client-supported¶
The diagram above uses syntax that is similar to but not defined in [RFC8340].¶
The "ietf-restconf-client" module defines the following "grouping" statements:¶
Each of these groupings are presented in the following subsections.¶
The following tree diagram [RFC8340] illustrates the "restconf-client-initiate-stack-grouping" grouping:¶
grouping restconf-client-initiate-stack-grouping:
+-- (transport)
+--:(https) {https-initiate}?
+-- 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
+---u rcc:restconf-client-grouping
¶
Comments:¶
For the referenced grouping statement(s):¶
The following tree diagram [RFC8340] illustrates the "restconf-client-listen-stack-grouping" grouping:¶
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
| +---u rcc:restconf-client-grouping
+--:(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
+---u rcc:restconf-client-grouping
¶
Comments:¶
For the referenced grouping statement(s):¶
The following tree diagram [RFC8340] illustrates the "restconf-client-app-grouping" grouping:¶
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-wait? uint16
| +-- max-attempts? uint8
+-- listen! {http-listen or https-listen}?
+-- idle-timeout? uint16
+-- endpoints
+-- endpoint* [name]
+-- name? string
+---u restconf-client-listen-stack-grouping
¶
Comments:¶
For the referenced grouping statement(s):¶
The following tree diagram [RFC8340] lists all the protocol-accessible nodes defined in the "ietf-restconf-client" module:¶
module: ietf-restconf-client
+--rw restconf-client {central-restconf-client-supported}?
+---u restconf-client-app-grouping
¶
Comments:¶
The following example illustrates configuring a RESTCONF client to initiate connections, as well as to listen for call-home connections.¶
This example is consistent with the examples presented in Section 2.2.1 of [I-D.ietf-netconf-trust-anchors] and Section 2.2.1 of [I-D.ietf-netconf-keystore].¶
=============== NOTE: '\' line wrapping per RFC 8792 ================
<restconf-client xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf-cl\
ient">
<!-- 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>
<remote-address>corp-fw1.example.com</remote-address>
<keepalives>
<idle-time>7200</idle-time>
<max-probes>9</max-probes>
<probe-interval>75</probe-interval>
</keepalives>
</tcp-client-parameters>
<tls-client-parameters>
<client-identity>
<certificate>
<central-keystore-reference>
<asymmetric-key>rsa-asymmetric-key</asymmetric-k\
ey>
<certificate>ex-rsa-cert</certificate>
</central-keystore-reference>
</certificate>
</client-identity>
<server-authentication>
<ca-certs>
<central-truststore-reference>trusted-server-ca-ce\
rts</central-truststore-reference>
</ca-certs>
<ee-certs>
<central-truststore-reference>trusted-server-ee-ce\
rts</central-truststore-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>
<cleartext-password>secret</cleartext-password>
</basic>
</client-identity>
</http-client-parameters>
</https>
</endpoint>
<endpoint>
<name>corp-fw2.example.com</name>
<https>
<tcp-client-parameters>
<remote-address>corp-fw2.example.com</remote-address>
<keepalives>
<idle-time>7200</idle-time>
<max-probes>9</max-probes>
<probe-interval>75</probe-interval>
</keepalives>
</tcp-client-parameters>
<tls-client-parameters>
<client-identity>
<certificate>
<central-keystore-reference>
<asymmetric-key>rsa-asymmetric-key</asymmetric-k\
ey>
<certificate>ex-rsa-cert</certificate>
</central-keystore-reference>
</certificate>
</client-identity>
<server-authentication>
<ca-certs>
<central-truststore-reference>trusted-server-ca-ce\
rts</central-truststore-reference>
</ca-certs>
<ee-certs>
<central-truststore-reference>trusted-server-ee-ce\
rts</central-truststore-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>
<cleartext-password>secret</cleartext-password>
</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>
<endpoints>
<endpoint>
<name>Intranet-facing listener</name>
<https>
<tcp-server-parameters>
<local-address>192.0.2.2</local-address>
</tcp-server-parameters>
<tls-client-parameters>
<client-identity>
<certificate>
<central-keystore-reference>
<asymmetric-key>rsa-asymmetric-key</asymmetric-key>
<certificate>ex-rsa-cert</certificate>
</central-keystore-reference>
</certificate>
</client-identity>
<server-authentication>
<ca-certs>
<central-truststore-reference>trusted-server-ca-cert\
s</central-truststore-reference>
</ca-certs>
<ee-certs>
<central-truststore-reference>trusted-server-ee-cert\
s</central-truststore-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>
<cleartext-password>secret</cleartext-password>
</basic>
</client-identity>
</http-client-parameters>
</https>
</endpoint>
</endpoints>
</listen>
</restconf-client>
¶
This YANG module has normative references to [RFC6991], [RFC8040], and [RFC8071], [I-D.ietf-netconf-tcp-client-server], [I-D.ietf-netconf-tls-client-server], and [I-D.ietf-netconf-http-client-server].¶
<CODE BEGINS> file "ietf-restconf-client@2024-02-22.yang"¶
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: https://datatracker.ietf.org/wg/netconf
WG List: NETCONF WG list <mailto:netconf@ietf.org>
Author: Kent Watsen <mailto:kent+ietf@watsen.net>";
description
"This module contains a collection of YANG definitions
for configuring RESTCONF clients.
Copyright (c) 2024 IETF Trust and the persons identified
as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with
or without modification, is permitted pursuant to, and
subject to the license terms contained in, the Revised
BSD License set forth in Section 4.c of the IETF Trust's
Legal Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC 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 2024-02-22 {
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 'http-listen' feature indicates that the RESTCONF client
supports opening a port to listen for incoming RESTCONF
server call-home connections using HTTP. This feature
exists as not all RESTCONF clients may support RESTCONF
call home.";
reference
"RFC 8071: NETCONF Call Home and RESTCONF Call Home";
}
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 using HTTPS. This feature
exists as not all RESTCONF clients may support RESTCONF
call home.";
reference
"RFC 8071: NETCONF Call Home and RESTCONF Call Home";
}
feature central-restconf-client-supported {
description
"The 'central-restconf-client-supported' feature indicates
that the server that implements this module supports
the top-level 'restconf-client' node.
This feature is needed as some servers may want to use
features defined in this module, which requires this
module to be implemented, without having to support
the top-level 'restconf-client' node.";
}
// 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 does not define any nodes. It
exists only so the model can be consistent with other
'client-server' models.";
}
grouping restconf-client-initiate-stack-grouping {
description
"A reusable grouping for configuring a RESTCONF client
'initiate' protocol stack for a single outbound connection.";
choice transport {
mandatory true;
description
"Selects between available transports.";
case https {
if-feature "https-initiate";
container https {
must 'tls-client-parameters/client-identity
or http-client-parameters/client-identity';
description
"TCP, TLS, HTTP, and RESTCONF configuration to
initiate a RESTCONF over HTTPS connection.";
container tcp-client-parameters {
description
"TCP-level client parameters to initiate
a RESTCONF over HTTPS connection.";
uses tcpc:tcp-client-grouping {
refine "remote-port" {
default "443";
description
"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 {
description
"TLS-level client parameters to initiate
a RESTCONF over HTTPS connection.";
uses tlsc:tls-client-grouping;
}
container http-client-parameters {
description
"HTTP-level client parameters to initiate
a RESTCONF over HTTPS connection.";
uses httpc:http-client-grouping;
}
container restconf-client-parameters {
description
"RESTCONF-level client parameters to initiate
a RESTCONF over HTTPS connection.";
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 listening on a single port. 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.";
case http {
if-feature "http-listen";
container http {
description
"TCP, HTTP, and RESTCONF configuration to
listen for RESTCONF over HTTPS connections.
This transport option is made available to support
deployments where the TLS connections are terminated
by another system (e.g., a load balancer) fronting
the client.";
container tcp-server-parameters {
description
"TCP-level server parameters to listen for
RESTCONF over HTTP connections.";
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
"HTTP-level client parameters to listen for
RESTCONF over HTTP connections.";
uses httpc:http-client-grouping;
}
container restconf-client-parameters {
description
"RESTCONF-level client parameters to listen
for RESTCONF over HTTP connections.";
uses rcc:restconf-client-grouping;
}
}
}
case https {
if-feature "https-listen";
container https {
must 'tls-client-parameters/client-identity
or http-client-parameters/client-identity';
description
"TCP, TLS, HTTP, and RESTCONF configuration to
listen for RESTCONF over HTTPS connections.";
container tcp-server-parameters {
description
"TCP-level server parameters to listen
for RESTCONF over HTTPS connections.";
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 {
description
"TLS-level client parameters to listen
for RESTCONF over HTTPS connections.";
uses tlsc:tls-client-grouping;
}
container http-client-parameters {
description
"HTTP-level client parameters to listen
for RESTCONF over HTTPS connections.";
uses httpc:http-client-grouping;
}
container restconf-client-parameters {
description
"RESTCONF-level client parameters to listen
for RESTCONF over HTTPS connections.";
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
"Indicates that client-initiated connections have been
configured. This statement is present so the mandatory
descendant nodes do not imply that this node must be
configured.";
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 a 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
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 decreases 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.
Connections are established at the same start
time regardless how long the previous connection
stayed open.
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 '[0-9]{4}-(1[0-2]|0[1-9])-(0[1-9]|[1-2]'
+ '[0-9]|3[0-1])T(0[0-9]|1[0-9]|2[0-3]):['
+ '0-5][0-9]:00(Z|[\+\-]((1[0-3]|0[0-9]):'
+ '([0-5][0-9])|14:00))?';
}
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.
If an 'anchor-time' is not provided, then the
server may implicitly set it to the time when
this configuraton is applied (e.g., on boot).
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 "180"; // three 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
"Indicates that reconnections should start with
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-wait {
type uint16 {
range "1..max";
}
units "seconds";
default "5";
description
"Specifies the amount of time in seconds after which,
if the connection is not established, an endpoint
connection attempt is considered unsuccessful.";
}
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
"Indicates that client-listening ports have been configured.
This statement is present so the mandatory descendant nodes
do not imply that this node must be configured.";
description
"Configures the client to accept call-home TCP connections.";
leaf idle-timeout {
type uint16;
units "seconds";
default "180"; // three minutes
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.";
}
container endpoints {
description
"Container for a list of endpoints.";
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-client-listen-stack-grouping;
}
}
} // listen
} // restconf-client-app-grouping
// Protocol accessible node for servers that implement this module.
container restconf-client {
if-feature central-restconf-client-supported;
uses restconf-client-app-grouping;
description
"Top-level container for RESTCONF client configuration.";
}
}
¶
<CODE ENDS>¶
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.¶
This section provides an overview of the "ietf-restconf-server" module in terms of its features and groupings.¶
The following diagram lists all the "feature" statements defined in the "ietf-restconf-server" module:¶
Features: +-- http-listen +-- https-listen +-- https-call-home +-- central-restconf-server-supported¶
The diagram above uses syntax that is similar to but not defined in [RFC8340].¶
The "ietf-restconf-server" module defines the following "grouping" statements:¶
Each of these groupings are presented in the following subsections.¶
The following tree diagram [RFC8340] illustrates the "restconf-server-grouping" grouping:¶
grouping restconf-server-grouping:
+-- client-identity-mappings
+---u x509c2n:cert-to-name
¶
Comments:¶
For the referenced grouping statement(s):¶
The following tree diagram [RFC8340] illustrates the "restconf-server-listen-stack-grouping" grouping:¶
grouping restconf-server-listen-stack-grouping:
+-- (transport)
+--:(http) {http-listen}?
| +-- http
| +-- external-endpoint!
| | +-- address inet:host
| | +-- 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
¶
Comments:¶
For the referenced grouping statement(s):¶
The following tree diagram [RFC8340] illustrates the "restconf-server-callhome-stack-grouping" grouping:¶
grouping restconf-server-callhome-stack-grouping:
+-- (transport)
+--:(https) {https-call-home}?
+-- 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
¶
Comments:¶
For the referenced grouping statement(s):¶
The following tree diagram [RFC8340] illustrates the "restconf-server-app-grouping" grouping:¶
grouping restconf-server-app-grouping:
+-- listen! {http-listen or https-listen}?
| +-- endpoints
| +-- 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
| +---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-wait? uint16
+-- max-attempts? uint8
¶
Comments:¶
For the referenced grouping statement(s):¶
The following tree diagram [RFC8340] lists all the protocol-accessible nodes defined in the "ietf-restconf-server" module:¶
module: ietf-restconf-server
+--rw restconf-server {central-restconf-server-supported}?
+---u restconf-server-app-grouping
¶
Comments:¶
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 2.2.1 of [I-D.ietf-netconf-trust-anchors] and Section 2.2.1 of [I-D.ietf-netconf-keystore].¶
=============== NOTE: '\' line wrapping per RFC 8792 ================
<restconf-server
xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf-server"
xmlns:x509c2n="urn:ietf:params:xml:ns:yang:ietf-x509-cert-to-name">
<!-- endpoints to listen for RESTCONF connections on -->
<listen>
<endpoints>
<endpoint>
<name>restconf/https</name>
<https>
<tcp-server-parameters>
<local-address>192.0.2.2</local-address>
</tcp-server-parameters>
<tls-server-parameters>
<server-identity>
<certificate>
<central-keystore-reference>
<asymmetric-key>rsa-asymmetric-key</asymmetric-key>
<certificate>ex-rsa-cert</certificate>
</central-keystore-reference>
</certificate>
</server-identity>
<client-authentication>
<ca-certs>
<central-truststore-reference>trusted-client-ca-cert\
s</central-truststore-reference>
</ca-certs>
<ee-certs>
<central-truststore-reference>trusted-client-ee-cert\
s</central-truststore-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>
</endpoints>
</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>
<tcp-client-parameters>
<remote-address>east.example.com</remote-address>
<keepalives>
<idle-time>7200</idle-time>
<max-probes>9</max-probes>
<probe-interval>75</probe-interval>
</keepalives>
</tcp-client-parameters>
<tls-server-parameters>
<server-identity>
<certificate>
<central-keystore-reference>
<asymmetric-key>rsa-asymmetric-key</asymmetric-k\
ey>
<certificate>ex-rsa-cert</certificate>
</central-keystore-reference>
</certificate>
</server-identity>
<client-authentication>
<ca-certs>
<central-truststore-reference>trusted-client-ca-ce\
rts</central-truststore-reference>
</ca-certs>
<ee-certs>
<central-truststore-reference>trusted-client-ee-ce\
rts</central-truststore-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>
<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>
<remote-address>west.example.com</remote-address>
<keepalives>
<idle-time>7200</idle-time>
<max-probes>9</max-probes>
<probe-interval>75</probe-interval>
</keepalives>
</tcp-client-parameters>
<tls-server-parameters>
<server-identity>
<certificate>
<central-keystore-reference>
<asymmetric-key>rsa-asymmetric-key</asymmetric-k\
ey>
<certificate>ex-rsa-cert</certificate>
</central-keystore-reference>
</certificate>
</server-identity>
<client-authentication>
<ca-certs>
<central-truststore-reference>trusted-client-ca-ce\
rts</central-truststore-reference>
</ca-certs>
<ee-certs>
<central-truststore-reference>trusted-client-ee-ce\
rts</central-truststore-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>
<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>
<anchor-time>2023-03-15T01:30:00Z</anchor-time>
<period>60</period>
</periodic>
</connection-type>
<reconnect-strategy>
<start-with>last-connected</start-with>
<max-wait>3</max-wait>
<max-attempts>3</max-attempts>
</reconnect-strategy>
</restconf-client>
</call-home>
</restconf-server>
¶
This YANG module has normative references to [RFC6991], [RFC7407], [RFC8040], [RFC8071], [I-D.ietf-netconf-tcp-client-server], [I-D.ietf-netconf-tls-client-server], and [I-D.ietf-netconf-http-client-server].¶
<CODE BEGINS> file "ietf-restconf-server@2024-02-22.yang"¶
module ietf-restconf-server {
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";
contact
"WG Web: https://datatracker.ietf.org/wg/netconf
WG List: NETCONF WG list <mailto:netconf@ietf.org>
Author: Kent Watsen <mailto:kent+ietf@watsen.net>";
description
"This module contains a collection of YANG definitions
for configuring RESTCONF servers.
Copyright (c) 2024 IETF Trust and the persons identified
as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with
or without modification, is permitted pursuant to, and
subject to the license terms contained in, the Revised
BSD License set forth in Section 4.c of the IETF Trust's
Legal Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC 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 2024-02-22 {
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
TCP client connections, whereby the TLS connections are
terminated by an external system.";
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";
}
feature central-restconf-server-supported {
description
"The 'central-restconf-server-supported' feature indicates
that the server supports the top-level 'restconf-server'
node.
This feature is needed as some servers may want to use
features defined in this module, which requires this
module to be implemented, without having to support
the top-level 'restconf-server' node.";
}
// 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 descendant
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
"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 listening on a single port.";
choice transport {
mandatory true;
description
"Selects between available transports.";
case http {
if-feature "http-listen";
container http {
description
"Configures RESTCONF server stack assuming that
TLS-termination is handled externally.
How a RESTCONF-server identifies RESTCONF-clients
authenticating using a TLS-level client-certificate
with external TLS termination is out of scope of
this document.";
container external-endpoint {
presence
"Identifies that an external endpoint has been
configured. This statement is present so the
mandatory descendant nodes do not imply that
this node must be configured.";
description
"Identifies contact information for the external
system that terminates connections before passing
them through 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.";
leaf address {
type inet:host;
mandatory true;
description
"The IP address or hostname of the external
system 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
"TCP-level server parameters to listen for
RESTCONF over HTTP connections.";
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
"HTTP-level server parameters to listen
for RESTCONF over HTTP connections.";
uses https:http-server-grouping;
}
container restconf-server-parameters {
description
"RESTCONF-level server parameters to listen
for RESTCONF over HTTP connections.";
uses rcs:restconf-server-grouping;
}
}
}
case https {
if-feature "https-listen";
container https {
description
"Configures RESTCONF server stack assuming that
TLS-termination is handled internally (i.e.,
not by a TLS-terminator in front of the RESTCONF
server).";
container tcp-server-parameters {
description
"TCP-level server parameters to listen for
RESTCONF over HTTPS connections.";
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
"TLS-level server parameters to listen
for RESTCONF over HTTPS connections.";
uses tlss:tls-server-grouping;
}
container http-server-parameters {
description
"HTTP-level server parameters to listen
for RESTCONF over HTTPS connections.";
uses https:http-server-grouping;
}
container restconf-server-parameters {
description
"RESTCONF-level server parameters to listen
for RESTCONF over HTTPS connections.";
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 outbound
connection.";
choice transport {
mandatory true;
description
"Selects between available transports.";
case https {
if-feature "https-call-home";
container https {
description
"Configures RESTCONF server stack assuming that
TLS-termination is handled internally.";
container tcp-client-parameters {
description
"TCP-level client parameters to initiate a
RESTCONF over HTTPS Call Home connection.";
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
"TLS-level server parameters to initiate a
RESTCONF over HTTPS Call Home connection.";
uses tlss:tls-server-grouping;
}
container http-server-parameters {
description
"HTTP-level server parameters to initiate a
RESTCONF over HTTPS Call Home connection.";
uses https:http-server-grouping;
}
container restconf-server-parameters {
description
"RESTCONF-level server parameters to initiate
a RESTCONF over HTTPS Call Home connection.";
uses rcs:restconf-server-grouping;
}
}
}
}
}
grouping restconf-server-app-grouping {
description
"A reusable grouping for configuring a RESTCONF server
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
"Identifies that the server has been configured to
listen for incoming client connections. This statement
is present so the mandatory descendant nodes do not
imply that this node must be configured.";
description
"Configures the RESTCONF server to listen for RESTCONF
client connections.";
container endpoints {
description
"Container for a list of endpoints.";
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
"Identifies that the server has been configured to initiate
call home connections. This statement is present so the
mandatory descendant nodes do not imply that this node
must be configured.";
description
"Configures the RESTCONF server to initiate the underlying
transport connection to RESTCONF clients.";
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-
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 client,
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 decreases resource
utilization, albeit with increased delay in
RESTCONF client to RESTCONF server 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
RESTCONF server MUST immediately attempt
to reestablish the connection.
Connections are established at the same start
time regardless how long the previous connection
stayed open.
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 '[0-9]{4}-(1[0-2]|0[1-9])-(0[1-9]|[1-2]'
+ '[0-9]|3[0-1])T(0[0-9]|1[0-9]|2[0-3]):['
+ '0-5][0-9]:00(Z|[\+\-]((1[0-3]|0[0-9]):'
+ '([0-5][0-9])|14:00))?';
}
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.
If an 'anchor-time' is not provided, then the
server may implicitly set it to the time when
this configuraton is applied (e.g., on boot).
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 "180"; // three 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 {
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
"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
servers SHOULD be able to remember the last
endpoint connected to across reboots.";
}
enum random-selection {
description
"Indicates that reconnections should start with
a random endpoint.";
}
}
default "first-listed";
description
"Specifies which of the RESTCONF client's endpoints
the RESTCONF server should start with when trying
to connect to the RESTCONF client.";
}
leaf max-wait {
type uint16 {
range "1..max";
}
units "seconds";
default "5";
description
"Specifies the amount of time in seconds after which,
if the connection is not established, an endpoint
connection attempt is considered unsuccessful.";
}
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
} // call-home
} // restconf-server-app-grouping
// Protocol accessible node for servers that implement this module.
container restconf-server {
if-feature central-restconf-server-supported;
uses restconf-server-app-grouping;
description
"Top-level container for RESTCONF server configuration.";
}
}
¶
<CODE ENDS>¶
This section follows the template defined in Section 3.7.1 of [RFC8407].¶
The "ietf-restconf-client" YANG module defines data nodes that are designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication.¶
The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content.¶
Please be aware that this YANG module uses groupings from other YANG modules that define nodes that may be considered sensitive or vulnerable in network environments. Please review the Security Considerations for dependent YANG modules for information as to which nodes may be considered sensitive or vulnerable in network environments.¶
None of the readable data nodes in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-all" extension has not been set for any data nodes defined in this module.¶
None of the writable data nodes in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-write" extension has not been set for any data nodes defined in this module.¶
This module does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here.¶
Please be aware that this module uses groupings defined in other RFCs that define data nodes that do set the NACM "default-deny-all" and "default-deny-write" extensions.¶
This section follows the template defined in Section 3.7.1 of [RFC8407].¶
The "ietf-restconf-server" YANG module defines data nodes that are designed to be accessed via YANG based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. Both of these protocols have mandatory-to-implement secure transport layers (e.g., SSH, TLS) with mutual authentication.¶
The Network Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular users to a pre-configured subset of all available protocol operations and content.¶
Please be aware that this YANG module uses groupings from other YANG modules that define nodes that may be considered sensitive or vulnerable in network environments. Please review the Security Considerations for dependent YANG modules for information as to which nodes may be considered sensitive or vulnerable in network environments.¶
None of the readable data nodes in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-all" extension has not been set for any data nodes defined in this module.¶
None of the writable data nodes in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-write" extension has not been set for any data nodes defined in this module.¶
This module does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here.¶
Please be aware that this module uses groupings defined in other RFCs that define data nodes that do set the NACM "default-deny-all" and "default-deny-write" extensions.¶
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 IESG XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-restconf-server Registrant Contact: The IESG XML: N/A, the requested URI is an XML namespace.¶
This document registers two YANG modules in the YANG Module Names registry [RFC6020]. Following the format in [RFC6020], the following registrations are requested:¶
name: ietf-restconf-client namespace: urn:ietf:params:xml:ns:yang:ietf-restconf-client prefix: rcc reference: RFC IIII name: ietf-restconf-server namespace: urn:ietf:params:xml:ns:yang:ietf-restconf-server prefix: rcs reference: RFC IIII¶
The authors would like to thank the following for lively discussions on list and in the halls (ordered by first name): Alan Luchuk, Andy Bierman, Balázs Kovács, Benoit Claise, Bert Wijnen David Lamparter, Jürgen Schönwälder, Ladislav Lhotka, Martin Björklund, Qiufang Ma, Mehmet Ersue, Michal Vaško, Phil Shafer, Qiufang Ma, Radek Krejci, Ramkumar Dhanapal, Rob Wilton, Sean Turner, and Tom Petch.¶