module ietf-tcp-client { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-tcp-client"; prefix tcpc; import ietf-inet-types { prefix inet; reference "RFC 6991: Common YANG Data Types"; } import ietf-crypto-types { prefix ct; reference "RFC 9640: YANG Data Types and Groupings for Cryptography"; } import ietf-tcp-common { prefix tcpcmn; reference "RFC 9643: YANG Groupings for TCP Clients and TCP Servers"; } organization "IETF NETCONF (Network Configuration) Working Group and the IETF TCP Maintenance and Minor Extensions (TCPM) Working Group"; contact "WG Web: https://datatracker.ietf.org/wg/netconf https://datatracker.ietf.org/wg/tcpm WG List: NETCONF WG list <mailto:netconf@ietf.org> TCPM WG list <mailto:tcpm@ietf.org> Authors: Kent Watsen <mailto:kent+ietf@watsen.net> Michael Scharf <mailto:michael.scharf@hs-esslingen.de>"; description "This module defines reusable groupings for TCP clients that can be used as a basis for specific TCP client instances. The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED', 'MAY', and 'OPTIONAL' in this document are to be interpreted as described in BCP 14 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here. 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 9643 (https://www.rfc-editor.org/info/rfc9643); see the RFC itself for full legal notices."; revision 2024-10-10 { description "Initial version."; reference "RFC 9643: YANG Groupings for TCP Clients and TCP Servers"; } // Features feature local-binding-supported { description "Indicates that the server supports configuring local bindings (i.e., the local address and local port) for TCP clients."; } feature tcp-client-keepalives { description "TCP keepalive parameters are configurable for TCP clients on the server implementing this feature."; reference "RFC 9293: Transmission Control Protocol (TCP)"; } feature proxy-connect { description "Indicates the TCP client supports connecting through TCP proxies."; } feature socks4-supported { if-feature "proxy-connect"; description "Indicates the TCP client supports Socks4-based proxies."; reference "SOCKS Proceedings: 1992 Usenix Security Symposium"; } feature socks4a-supported { if-feature "proxy-connect"; description "Indicates the TCP client supports Socks4a-based proxies."; reference "OpenSSH message: SOCKS 4A: A Simple Extension to SOCKS 4 Protocol <https://www.openssh.com/txt/socks4a.protocol>"; } feature socks5-supported { if-feature "proxy-connect"; description "Indicates the TCP client supports Socks5-based proxies."; reference "RFC 1928: SOCKS Protocol Version 5"; } feature socks5-gss-api { if-feature "socks5-supported"; description "Indicates that the server, when acting as a TCP client, supports authenticating to a SOCKS Version 5 proxy server using GSS-API credentials."; reference "RFC 1928: SOCKS Protocol Version 5"; } feature socks5-username-password { if-feature "socks5-supported"; description "Indicates that the server, when acting as a TCP client, supports authenticating to a SOCKS Version 5 proxy server using 'username' and 'password' credentials."; reference "RFC 1928: SOCKS Protocol Version 5"; } // Groupings grouping tcp-client-grouping { description "A reusable grouping for configuring a TCP client. 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 'tcp-client-parameters'). This model purposely does not do this itself so as to provide maximum flexibility to consuming models."; leaf remote-address { type inet:host; mandatory true; description "The IP address or hostname of the remote peer to establish a connection with. If a domain name is configured, then the DNS resolution should happen on each connection attempt. If the DNS resolution results in multiple IP addresses, the IP addresses are tried according to local preference order until a connection has been established or until all IP addresses have failed."; } leaf remote-port { type inet:port-number; description "The port number of the remote TCP server."; } leaf local-address { if-feature "local-binding-supported"; type inet:ip-address; description "The local IP address/interface to bind to for when connecting to the remote peer. INADDR_ANY ('0.0.0.0') or INADDR6_ANY ('0:0:0:0:0:0:0:0' a.k.a. '::') MAY be used to explicitly indicate the implicit default, which the server can bind to any IPv4 or IPv6 address."; } leaf local-port { if-feature "local-binding-supported"; type inet:port-number; default "0"; description "The local IP port number to bind to for when connecting to the remote peer. The port number '0', which is the default value, indicates that any available local port number may be used."; } container proxy-server { if-feature "proxy-connect"; presence "Indicates that a proxy connection has been configured. Present so that the mandatory descendant nodes do not imply that this node must be configured."; choice proxy-type { mandatory true; description "Selects a proxy connection protocol."; case socks4 { if-feature "socks4-supported"; container socks4-parameters { leaf remote-address { type inet:ip-address; mandatory true; description "The IP address of the proxy server."; } leaf remote-port { type inet:port-number; default "1080"; description "The IP port number for the proxy server."; } description "Parameters for connecting to a TCP-based proxy server using the SOCKS4 protocol."; reference "SOCKS Proceedings: 1992 Usenix Security Symposium"; } } case socks4a { if-feature "socks4a-supported"; container socks4a-parameters { leaf remote-address { type inet:host; mandatory true; description "The IP address or hostname of the proxy server."; } leaf remote-port { type inet:port-number; default "1080"; description "The IP port number for the proxy server."; } description "Parameters for connecting to a TCP-based proxy server using the SOCKS4a protocol."; reference "SOCKS Proceedings: 1992 Usenix Security Symposium OpenSSH message: SOCKS 4A: A Simple Extension to SOCKS 4 Protocol <https://www.openssh.com/txt/socks4a.protocol>"; } } case socks5 { if-feature "socks5-supported"; container socks5-parameters { leaf remote-address { type inet:host; mandatory true; description "The IP address or hostname of the proxy server."; } leaf remote-port { type inet:port-number; default "1080"; description "The IP port number for the proxy server."; } container authentication-parameters { presence "Indicates that an authentication mechanism has been configured. Present so that the mandatory descendant nodes do not imply that this node must be configured."; description "A container for SOCKS Version 5 authentication mechanisms. A complete list of methods is defined at: <https://www.iana.org/assignments/socks-methods>."; reference "RFC 1928: SOCKS Protocol Version 5"; choice auth-type { mandatory true; description "A choice amongst supported SOCKS Version 5 authentication mechanisms."; case gss-api { if-feature "socks5-gss-api"; container gss-api { description "Contains GSS-API configuration. Defines as an empty container to enable specific GSS-API configuration to be augmented in by future modules."; reference "RFC 1928: SOCKS Protocol Version 5 RFC 2743: Generic Security Service Application Program Interface Version 2, Update 1"; } } case username-password { if-feature "socks5-username-password"; container username-password { leaf username { type string; mandatory true; description "The 'username' value to use for client identification."; } uses ct:password-grouping { description "The password to be used for client authentication."; } description "Contains username/password configuration."; reference "RFC 1929: Username/Password Authentication for SOCKS V5"; } } } } description "Parameters for connecting to a TCP-based proxy server using the SOCKS5 protocol."; reference "RFC 1928: SOCKS Protocol Version 5"; } } } description "Proxy server settings."; } uses tcpcmn:tcp-common-grouping { refine "keepalives" { if-feature "tcp-client-keepalives"; description "An 'if-feature' statement so that implementations can choose to support TCP client keepalives."; } } } }