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Merging upstream version 3.5.5 (Closes: #1098233).

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-18 11:33:30 +01:00
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module ietf-tls-server {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-tls-server";
prefix tlss;
import ietf-netconf-acm {
prefix nacm;
reference
"RFC 8341: Network Configuration Access Control Model";
}
import ietf-crypto-types {
prefix ct;
reference
"RFC AAAA: YANG Data Types and Groupings for Cryptography";
}
import ietf-truststore {
prefix ts;
reference
"RFC BBBB: A YANG Data Model for a Truststore";
}
import ietf-keystore {
prefix ks;
reference
"RFC CCCC: A YANG Data Model for a Keystore";
}
import ietf-tls-common {
prefix tlscmn;
reference
"RFC FFFF: YANG Groupings for TLS Clients and TLS Servers";
}
organization
"IETF NETCONF (Network Configuration) Working Group";
contact
"WG List: NETCONF WG list <mailto:netconf@ietf.org>
WG Web: https://datatracker.ietf.org/wg/netconf
Author: Kent Watsen <mailto:kent+ietf@watsen.net>
Author: Jeff Hartley <mailto:jeff.hartley@commscope.com>";
description
"This module defines reusable groupings for TLS servers that
can be used as a basis for specific TLS server instances.
Copyright (c) 2023 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 FFFF
(https://www.rfc-editor.org/info/rfcFFFF); 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 2023-12-28 {
description
"Initial version";
reference
"RFC FFFF: YANG Groupings for TLS Clients and TLS Servers";
}
// Features
feature tls-server-keepalives {
description
"Per socket TLS keepalive parameters are configurable for
TLS servers on the server implementing this feature.";
}
feature server-ident-x509-cert {
description
"Indicates that the server supports identifying itself
using X.509 certificates.";
reference
"RFC 5280:
Internet X.509 Public Key Infrastructure Certificate
and Certificate Revocation List (CRL) Profile";
}
feature server-ident-raw-public-key {
description
"Indicates that the server supports identifying itself
using raw public keys.";
reference
"RFC 7250:
Using Raw Public Keys in Transport Layer Security (TLS)
and Datagram Transport Layer Security (DTLS)";
}
feature server-ident-tls12-psk {
if-feature "tlscmn:tls12";
description
"Indicates that the server supports identifying itself
using TLS-1.2 PSKs (pre-shared or pairwise-symmetric keys).";
reference
"RFC 4279:
Pre-Shared Key Ciphersuites for Transport Layer Security
(TLS)";
}
feature server-ident-tls13-epsk {
if-feature "tlscmn:tls13";
description
"Indicates that the server supports identifying itself
using TLS-1.3 External PSKs (pre-shared keys).";
reference
"RFC 8446:
The Transport Layer Security (TLS) Protocol Version 1.3";
}
feature client-auth-supported {
description
"Indicates that the configuration for how to authenticate
clients can be configured herein. TLS-level client
authentication may not be needed when client authentication
is expected to occur only at another protocol layer.";
}
feature client-auth-x509-cert {
description
"Indicates that the server supports authenticating clients
using X.509 certificates.";
reference
"RFC 5280:
Internet X.509 Public Key Infrastructure Certificate
and Certificate Revocation List (CRL) Profile";
}
feature client-auth-raw-public-key {
description
"Indicates that the server supports authenticating clients
using raw public keys.";
reference
"RFC 7250:
Using Raw Public Keys in Transport Layer Security (TLS)
and Datagram Transport Layer Security (DTLS)";
}
feature client-auth-tls12-psk {
description
"Indicates that the server supports authenticating clients
using PSKs (pre-shared or pairwise-symmetric keys).";
reference
"RFC 4279:
Pre-Shared Key Ciphersuites for Transport Layer Security
(TLS)";
}
feature client-auth-tls13-epsk {
description
"Indicates that the server supports authenticating clients
using TLS-1.3 External PSKs (pre-shared keys).";
reference
"RFC 8446:
The Transport Layer Security (TLS) Protocol Version 1.3";
}
// Groupings
grouping tls-server-grouping {
description
"A reusable grouping for configuring a TLS server without
any consideration for how underlying TCP sessions are
established.
Note that this grouping uses fairly typical descendant
node names such that a stack of 'uses' statements will
have name conflicts. It is intended that the consuming
data model will resolve the issue (e.g., by wrapping
the 'uses' statement in a container called
'tls-server-parameters'). This model purposely does
not do this itself so as to provide maximum flexibility
to consuming models.";
container server-identity {
nacm:default-deny-write;
description
"A locally-defined or referenced end-entity certificate,
including any configured intermediate certificates, the
TLS server will present when establishing a TLS connection
in its Certificate message, as defined in Section 7.4.2
in RFC 5246 and Section 4.4.2 in RFC 8446.";
reference
"RFC 5246: The Transport Layer Security (TLS) Protocol
Version 1.2
RFC 8446: The Transport Layer Security (TLS) Protocol
Version 1.3
RFC CCCC: A YANG Data Model for a Keystore";
choice auth-type {
mandatory true;
description
"A choice amongst authentication types, of which one must
be enabled (via its associated 'feature') and selected.";
case certificate {
if-feature "server-ident-x509-cert";
container certificate {
description
"Specifies the server identity using a certificate.";
uses
"ks:inline-or-keystore-end-entity-cert-with-key-"
+ "grouping" {
refine "inline-or-keystore/inline/inline-definition" {
must 'not(public-key-format) or derived-from-or-self'
+ '(public-key-format,' + ' "ct:subject-public-'
+ 'key-info-format")';
}
refine "inline-or-keystore/central-keystore/"
+ "central-keystore-reference/asymmetric-key" {
must 'not(deref(.)/../ks:public-key-format) or '
+ 'derived-from-or-self(deref(.)/../ks:public-key'
+ '-format, "ct:subject-public-key-info-format")';
}
}
}
}
case raw-private-key {
if-feature "server-ident-raw-public-key";
container raw-private-key {
description
"Specifies the server identity using a raw
private key.";
uses ks:inline-or-keystore-asymmetric-key-grouping {
refine "inline-or-keystore/inline/inline-definition" {
must 'not(public-key-format) or derived-from-or-self'
+ '(public-key-format,' + ' "ct:subject-public-'
+ 'key-info-format")';
}
refine "inline-or-keystore/central-keystore/"
+ "central-keystore-reference" {
must 'not(deref(.)/../ks:public-key-format) or '
+ 'derived-from-or-self(deref(.)/../ks:public-key'
+ '-format, "ct:subject-public-key-info-format")';
}
}
}
}
case tls12-psk {
if-feature "server-ident-tls12-psk";
container tls12-psk {
description
"Specifies the server identity using a PSK (pre-shared
or pairwise-symmetric key).";
uses ks:inline-or-keystore-symmetric-key-grouping;
leaf id-hint {
type string;
description
"The key 'psk_identity_hint' value used in the TLS
'ServerKeyExchange' message.";
reference
"RFC 4279: Pre-Shared Key Ciphersuites for
Transport Layer Security (TLS)";
}
}
}
case tls13-epsk {
if-feature "server-ident-tls13-epsk";
container tls13-epsk {
description
"An External Pre-Shared Key (EPSK) is established
or provisioned out-of-band, i.e., not from a TLS
connection. An EPSK is a tuple of (Base Key,
External Identity, Hash). External PSKs MUST
NOT be imported for (D)TLS 1.2 or prior versions.
When PSKs are provisioned out of band, the PSK
identity and the KDF hash algorithm to be used
with the PSK MUST also be provisioned.
The structure of this container is designed to
satisfy the requirements of RFC 8446 Section
4.2.11, the recommendations from Section 6 in
RFC 9257, and the EPSK input fields detailed in
Section 5.1 in RFC 9258. The base-key is based
upon ks:inline-or-keystore-symmetric-key-grouping
in order to provide users with flexible and
secure storage options.";
reference
"RFC 8446: The Transport Layer Security (TLS)
Protocol Version 1.3
RFC 9257: Guidance for External Pre-Shared Key
(PSK) Usage in TLS
RFC 9258: Importing External Pre-Shared Keys
(PSKs) for TLS 1.3";
uses ks:inline-or-keystore-symmetric-key-grouping;
leaf external-identity {
type string;
mandatory true;
description
"As per Section 4.2.11 of RFC 8446, and Section 4.1
of RFC 9257, a sequence of bytes used to identify
an EPSK. A label for a pre-shared key established
externally.";
reference
"RFC 8446: The Transport Layer Security (TLS)
Protocol Version 1.3
RFC 9257: Guidance for External Pre-Shared Key
(PSK) Usage in TLS";
}
leaf hash {
type tlscmn:epsk-supported-hash;
default sha-256;
description
"As per Section 4.2.11 of RFC 8446, for externally
established PSKs, the Hash algorithm MUST be set
when the PSK is established or default to SHA-256
if no such algorithm is defined. The server MUST
ensure that it selects a compatible PSK (if any)
and cipher suite. Each PSK MUST only be used
with a single hash function.";
reference
"RFC 8446: The Transport Layer Security (TLS)
Protocol Version 1.3";
}
leaf context {
type string;
description
"Per Section 5.1 of RFC 9258, context MUST include
the context used to determine the EPSK, if
any exists. For example, context may include
information about peer roles or identities
to mitigate Selfie-style reflection attacks.
Since the EPSK is a key derived from an external
protocol or sequence of protocols, context MUST
include a channel binding for the deriving
protocols [RFC5056]. The details of this
binding are protocol specfic and out of scope
for this document.";
reference
"RFC 9258: Importing External Pre-Shared Keys
(PSKs) for TLS 1.3";
}
leaf target-protocol {
type uint16;
description
"As per Section 3.1 of RFC 9258, the protocol
for which a PSK is imported for use.";
reference
"RFC 9258: Importing External Pre-Shared Keys
(PSKs) for TLS 1.3";
}
leaf target-kdf {
type uint16;
description
"As per Section 3 of RFC 9258, the KDF for
which a PSK is imported for use.";
reference
"RFC 9258: Importing External Pre-Shared Keys
(PSKs) for TLS 1.3";
}
}
}
}
} // container server-identity
container client-authentication {
if-feature "client-auth-supported";
nacm:default-deny-write;
must 'ca-certs or ee-certs or raw-public-keys or tls12-psks
or tls13-epsks';
presence
"Indicates that client authentication is supported (i.e.,
that the server will request clients send certificates).
If not configured, the TLS server SHOULD NOT request the
TLS clients provide authentication credentials.";
description
"Specifies how the TLS server can authenticate TLS clients.
Any combination of credentials is additive and unordered.
Note that no configuration is required for PSK (pre-shared
or pairwise-symmetric key) based authentication as the key
is necessarily the same as configured in the '../server-
identity' node.";
container ca-certs {
if-feature "client-auth-x509-cert";
presence
"Indicates that CA certificates have been configured.
This statement is present so the mandatory descendant
nodes do not imply that this node must be configured.";
description
"A set of certificate authority (CA) certificates used by
the TLS server to authenticate TLS client certificates.
A client certificate is authenticated if it has a valid
chain of trust to a configured CA certificate.";
reference
"RFC BBBB: A YANG Data Model for a Truststore";
uses ts:inline-or-truststore-certs-grouping;
}
container ee-certs {
if-feature "client-auth-x509-cert";
presence
"Indicates that EE certificates have been configured.
This statement is present so the mandatory descendant
nodes do not imply that this node must be configured.";
description
"A set of client certificates (i.e., end entity
certificates) used by the TLS server to authenticate
certificates presented by TLS clients. A client
certificate is authenticated if it is an exact
match to a configured client certificate.";
reference
"RFC BBBB: A YANG Data Model for a Truststore";
uses ts:inline-or-truststore-certs-grouping;
}
container raw-public-keys {
if-feature "client-auth-raw-public-key";
presence
"Indicates that raw public keys have been configured.
This statement is present so the mandatory descendant
nodes do not imply that this node must be configured.";
description
"A set of raw public keys used by the TLS server to
authenticate raw public keys presented by the TLS
client. A raw public key is authenticated if it
is an exact match to a configured raw public key.";
reference
"RFC BBBB: A YANG Data Model for a Truststore";
uses ts:inline-or-truststore-public-keys-grouping {
refine "inline-or-truststore/inline/inline-definition/"
+ "public-key" {
must 'derived-from-or-self(public-key-format,'
+ ' "ct:subject-public-key-info-format")';
}
refine "inline-or-truststore/central-truststore/"
+ "central-truststore-reference" {
must 'not(deref(.)/../ts:public-key/ts:public-key-'
+ 'format[not(derived-from-or-self(., "ct:subject-'
+ 'public-key-info-format"))])';
}
}
}
leaf tls12-psks {
if-feature "client-auth-tls12-psk";
type empty;
description
"Indicates that the TLS server can authenticate TLS clients
using configured PSKs (pre-shared or pairwise-symmetric
keys).
No configuration is required since the PSK value is the
same as PSK value configured in the 'server-identity'
node.";
}
leaf tls13-epsks {
if-feature "client-auth-tls13-epsk";
type empty;
description
"Indicates that the TLS 1.3 server can authenticate TLS
clients using configured external PSKs (pre-shared keys).
No configuration is required since the PSK value is the
same as PSK value configured in the 'server-identity'
node.";
}
} // container client-authentication
container hello-params {
nacm:default-deny-write;
if-feature "tlscmn:hello-params";
uses tlscmn:hello-params-grouping;
description
"Configurable parameters for the TLS hello message.";
} // container hello-params
container keepalives {
nacm:default-deny-write;
if-feature "tls-server-keepalives";
description
"Configures the keepalive policy for the TLS server.";
leaf peer-allowed-to-send {
type empty;
description
"Indicates that the remote TLS client is allowed to send
HeartbeatRequest messages, as defined by RFC 6520
to this TLS server.";
reference
"RFC 6520: Transport Layer Security (TLS) and Datagram
Transport Layer Security (DTLS) Heartbeat Extension";
}
container test-peer-aliveness {
presence
"Indicates that the TLS server proactively tests the
aliveness of the remote TLS client.";
description
"Configures the keep-alive policy to proactively test
the aliveness of the TLS client. An unresponsive
TLS client is dropped after approximately max-wait
* max-attempts seconds.";
leaf max-wait {
type uint16 {
range "1..max";
}
units "seconds";
default "30";
description
"Sets the amount of time in seconds after which if
no data has been received from the TLS client, a
TLS-level message will be sent to test the
aliveness of the TLS client.";
}
leaf max-attempts {
type uint8;
default "3";
description
"Sets the maximum number of sequential keep-alive
messages that can fail to obtain a response from
the TLS client before assuming the TLS client is
no longer alive.";
}
}
} // container keepalives
} // grouping tls-server-grouping
}