module ietf-ssh-server {
  yang-version 1.1;

  namespace "urn:ietf:params:xml:ns:yang:ietf-ssh-server";
  prefix "ts";

  import ietf-inet-types {           // RFC 6991
    prefix inet;
  }
  import ietf-keychain {
    prefix kc;                       // RFC VVVV
    revision-date 2015-10-09;
  }

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

  contact
   "WG Web:   <http://tools.ietf.org/wg/netconf/>
    WG List:  <mailto:netconf@ietf.org>

    WG Chair: Mehmet Ersue
              <mailto:mehmet.ersue@nsn.com>
    WG Chair: Mahesh Jethanandani
              <mailto:mjethanandani@gmail.com>

    Editor:   Kent Watsen
              <mailto:kwatsen@juniper.net>";


  description
   "This module defines a reusable grouping for a SSH server that
    can be used as a basis for specific SSH server instances.

    Copyright (c) 2014 IETF Trust and the persons identified as
    authors of the code. All rights reserved.

    Redistribution and use in source and binary forms, with or
    without modification, is permitted pursuant to, and subject
    to the license terms contained in, the Simplified BSD
    License set forth in Section 4.c of the IETF Trust's
    Legal Provisions Relating to IETF Documents
    (http://trustee.ietf.org/license-info).

    This version of this YANG module is part of RFC VVVV; see
    the RFC itself for full legal notices.";

  revision "2015-10-09" {
    description
     "Initial version";
    reference
     "RFC VVVV: NETCONF Server and RESTCONF Server Configuration
                Models";
  }

  // features
  feature ssh-x509-certs {
    description
      "The ssh-x509-certs feature indicates that the NETCONF
       server supports RFC 6187";
    reference
      "RFC 6187: X.509v3 Certificates for Secure Shell
       Authentication";
  }

  // grouping
  grouping non-listening-ssh-server-grouping {
    description
      "A reusable grouping for a SSH server that can be used as a
       basis for specific SSH server instances.";

    container host-keys {
      description
        "The list of host-keys the SSH server will present when
         establishing a SSH connection.";
      list host-key {
        key name;
        min-elements 1;
        ordered-by user;
        description
          "An ordered list of host keys the SSH server advertises
           when sending its ??? message.";
        reference
          "RFC ????: ...";
        leaf name {
          type string;
          mandatory true;
          description
            "An arbitrary name for this host-key";
        }
        choice type {
          description
            "The type of host key being specified";
          leaf public-key {
            type leafref {
              path "/kc:keychain/kc:private-keys/kc:private-key/"
                   + "kc:name";
            }
            description
              "The name of a private-key in the keychain.";
          }
          leaf certificate {
            if-feature ssh-x509-certs;
            type leafref {
              path "/kc:keychain/kc:private-keys/kc:private-key/"
                   + "kc:certificates/kc:certificate/kc:name";
            }
            description
              "The name of a certificate in the keychain.";
          }
        }
      }
    }

    container client-cert-auth {
      if-feature ssh-x509-certs;
      description
        "A reference to a list of trusted certificate authority (CA)
         certificates and a reference to a list of trusted client
         certificates.";
      leaf trusted-ca-certs {
        type leafref {
          path "/kc:keychain/kc:trusted-certificates/kc:name";
        }
        description
          "A reference to a list of certificate authority (CA)
           certificates used by the SSH server to authenticate
           SSH client certificates.";
      }

      leaf trusted-client-certs {
        type leafref {
          path "/kc:keychain/kc:trusted-certificates/kc:name";
        }
        description
          "A reference to a list of client certificates used by
           the SSH server to authenticate SSH client certificates.
           A clients certificate is authenticated if it is an
           exact match to a configured trusted client certificate.";
      }
    }
  }


  grouping listening-ssh-server-grouping {
    description
      "A reusable grouping for a SSH server that can be used as a
       basis for specific SSH server instances.";
    leaf address {
      type inet:ip-address;
      description
       "The IP address of the interface to listen on. The SSH
        server will listen on all interfaces if no value is
        specified.";
    }
    leaf port {
      type inet:port-number;
      mandatory true;  // will a default augmented in work?
      description
       "The local port number on this interface the SSH server
        listens on.";
    }
    uses non-listening-ssh-server-grouping;
  }

  // RFC Editor: please remove the following container block
  //             when publishing this document as an RFC.
  container listening-ssh-server {
    description
      "This container is only present to enable `pyang`
       tree diagram output, as a grouping by itself has
       no protocol accessible nodes to output.";

       uses listening-ssh-server-grouping;
  }


}