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+module ietf-system {
+  namespace "urn:ietf:params:xml:ns:yang:ietf-system";
+  prefix "sys";
+
+  import ietf-yang-types {
+    prefix yang;
+  }
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+
+  import ietf-netconf-acm {
+    prefix nacm;
+  }
+
+  import iana-crypt-hash {
+    prefix ianach;
+  }
+
+  organization
+    "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+  contact
+    "WG Web:   <http://tools.ietf.org/wg/netmod/>
+     WG List:  <mailto:netmod@ietf.org>
+
+     WG Chair: Thomas Nadeau
+               <mailto:tnadeau@lucidvision.com>
+
+     WG Chair: Juergen Schoenwaelder
+               <mailto:j.schoenwaelder@jacobs-university.de>
+
+     Editor:   Andy Bierman
+               <mailto:andy@yumaworks.com>
+
+     Editor:   Martin Bjorklund
+               <mailto:mbj@tail-f.com>";
+
+  description
+    "This module contains a collection of YANG definitions for the
+     configuration and identification of some common system
+     properties within a device containing a NETCONF server.  This
+     includes data node definitions for system identification,
+     time-of-day management, user management, DNS resolver
+     configuration, and some protocol operations for system
+     management.
+
+     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 7317; see
+     the RFC itself for full legal notices.";
+
+  revision 2014-08-06 {
+    description
+      "Initial revision.";
+    reference
+      "RFC 7317: A YANG Data Model for System Management";
+  }
+
+ /*
+  * Typedefs
+  */
+
+  typedef timezone-name {
+    type string;
+    description
+      "A time zone name as used by the Time Zone Database,
+       sometimes referred to as the 'Olson Database'.
+
+       The exact set of valid values is an implementation-specific
+       matter.  Client discovery of the exact set of time zone names
+       for a particular server is out of scope.";
+    reference
+      "RFC 6557: Procedures for Maintaining the Time Zone Database";
+   }
+
+  /*
+   * Features
+   */
+
+  feature radius {
+    description
+      "Indicates that the device can be configured as a RADIUS
+       client.";
+    reference
+      "RFC 2865: Remote Authentication Dial In User Service (RADIUS)";
+  }
+
+  feature authentication {
+    description
+      "Indicates that the device supports configuration of
+       user authentication.";
+  }
+
+  feature local-users {
+    if-feature authentication;
+    description
+      "Indicates that the device supports configuration of
+       local user authentication.";
+  }
+
+  feature radius-authentication {
+    if-feature radius;
+    if-feature authentication;
+    description
+      "Indicates that the device supports configuration of user
+       authentication over RADIUS.";
+    reference
+      "RFC 2865: Remote Authentication Dial In User Service (RADIUS)
+       RFC 5607: Remote Authentication Dial-In User Service (RADIUS)
+                 Authorization for Network Access Server (NAS)
+                 Management";
+  }
+
+  feature ntp {
+    description
+      "Indicates that the device can be configured to use one or
+       more NTP servers to set the system date and time.";
+  }
+
+  feature ntp-udp-port {
+    if-feature ntp;
+    description
+      "Indicates that the device supports the configuration of
+       the UDP port for NTP servers.
+
+       This is a 'feature', since many implementations do not support
+       any port other than the default port.";
+  }
+
+  feature timezone-name {
+    description
+      "Indicates that the local time zone on the device
+       can be configured to use the TZ database
+       to set the time zone and manage daylight saving time.";
+    reference
+      "RFC 6557: Procedures for Maintaining the Time Zone Database";
+  }
+
+  feature dns-udp-tcp-port {
+    description
+      "Indicates that the device supports the configuration of
+       the UDP and TCP port for DNS servers.
+
+       This is a 'feature', since many implementations do not support
+       any port other than the default port.";
+  }
+
+  /*
+   * Identities
+   */
+
+  identity authentication-method {
+    description
+      "Base identity for user authentication methods.";
+  }
+
+  identity radius {
+    base authentication-method;
+    description
+      "Indicates user authentication using RADIUS.";
+    reference
+      "RFC 2865: Remote Authentication Dial In User Service (RADIUS)
+       RFC 5607: Remote Authentication Dial-In User Service (RADIUS)
+                 Authorization for Network Access Server (NAS)
+                 Management";
+  }
+
+  identity local-users {
+    base authentication-method;
+    description
+      "Indicates password-based authentication of locally
+       configured users.";
+  }
+
+  identity radius-authentication-type {
+    description
+      "Base identity for RADIUS authentication types.";
+  }
+
+  identity radius-pap {
+    base radius-authentication-type;
+    description
+      "The device requests Password Authentication Protocol (PAP)
+       authentication from the RADIUS server.";
+    reference
+      "RFC 2865: Remote Authentication Dial In User Service (RADIUS)";
+  }
+
+  identity radius-chap {
+    base radius-authentication-type;
+    description
+      "The device requests Challenge Handshake Authentication
+       Protocol (CHAP) authentication from the RADIUS server.";
+    reference
+      "RFC 2865: Remote Authentication Dial In User Service (RADIUS)";
+  }
+
+  /*
+   * Configuration data nodes
+   */
+
+  container system {
+    description
+      "System group configuration.";
+
+    leaf contact {
+      type string;
+      description
+        "The administrator contact information for the system.
+
+         A server implementation MAY map this leaf to the sysContact
+         MIB object.  Such an implementation needs to use some
+         mechanism to handle the differences in size and characters
+         allowed between this leaf and sysContact.  The definition of
+         such a mechanism is outside the scope of this document.";
+      reference
+        "RFC 3418: Management Information Base (MIB) for the
+                   Simple Network Management Protocol (SNMP)
+                   SNMPv2-MIB.sysContact";
+    }
+    leaf hostname {
+      type inet:domain-name;
+     description
+       "The name of the host.  This name can be a single domain
+        label or the fully qualified domain name of the host.";
+    }
+    leaf location {
+      type string;
+      description
+        "The system location.
+
+         A server implementation MAY map this leaf to the sysLocation
+         MIB object.  Such an implementation needs to use some
+         mechanism to handle the differences in size and characters
+         allowed between this leaf and sysLocation.  The definition
+         of such a mechanism is outside the scope of this document.";
+      reference
+        "RFC 3418: Management Information Base (MIB) for the
+                   Simple Network Management Protocol (SNMP)
+                   SNMPv2-MIB.sysLocation";
+    }
+
+    container clock {
+      description
+        "Configuration of the system date and time properties.";
+
+      choice timezone {
+        description
+          "The system time zone information.";
+
+        case timezone-name {
+          if-feature timezone-name;
+          leaf timezone-name {
+            type timezone-name;
+            description
+              "The TZ database name to use for the system, such
+               as 'Europe/Stockholm'.";
+          }
+        }
+        case timezone-utc-offset {
+          leaf timezone-utc-offset {
+            type int16 {
+              range "-1500 .. 1500";
+            }
+            units "minutes";
+            description
+              "The number of minutes to add to UTC time to
+               identify the time zone for this system.  For example,
+               'UTC - 8:00 hours' would be represented as '-480'.
+               Note that automatic daylight saving time adjustment
+               is not provided if this object is used.";
+          }
+        }
+      }
+    }
+
+    container ntp {
+      if-feature ntp;
+      presence
+        "Enables the NTP client unless the 'enabled' leaf
+         (which defaults to 'true') is set to 'false'";
+      description
+        "Configuration of the NTP client.";
+
+      leaf enabled {
+        type boolean;
+        default true;
+        description
+          "Indicates that the system should attempt to
+           synchronize the system clock with an NTP server
+           from the 'ntp/server' list.";
+      }
+      list server {
+        key name;
+        description
+          "List of NTP servers to use for system clock
+           synchronization.  If '/system/ntp/enabled'
+           is 'true', then the system will attempt to
+           contact and utilize the specified NTP servers.";
+
+        leaf name {
+          type string;
+          description
+            "An arbitrary name for the NTP server.";
+        }
+        choice transport {
+          mandatory true;
+          description
+            "The transport-protocol-specific parameters for this
+             server.";
+
+          case udp {
+            container udp {
+              description
+                "Contains UDP-specific configuration parameters
+                 for NTP.";
+              leaf address {
+                type inet:host;
+                mandatory true;
+                description
+                  "The address of the NTP server.";
+              }
+              leaf port {
+                if-feature ntp-udp-port;
+                type inet:port-number;
+                default 123;
+                description
+                  "The port number of the NTP server.";
+              }
+            }
+          }
+        }
+        leaf association-type {
+          type enumeration {
+            enum server {
+              description
+                "Use client association mode.  This device
+                 will not provide synchronization to the
+                 configured NTP server.";
+            }
+            enum peer {
+              description
+                "Use symmetric active association mode.
+                 This device may provide synchronization
+                 to the configured NTP server.";
+            }
+            enum pool {
+              description
+                "Use client association mode with one or
+                 more of the NTP servers found by DNS
+                 resolution of the domain name given by
+                 the 'address' leaf.  This device will not
+                 provide synchronization to the servers.";
+            }
+          }
+          default server;
+          description
+            "The desired association type for this NTP server.";
+        }
+        leaf iburst {
+          type boolean;
+          default false;
+          description
+            "Indicates whether this server should enable burst
+             synchronization or not.";
+        }
+        leaf prefer {
+          type boolean;
+          default false;
+          description
+            "Indicates whether this server should be preferred
+             or not.";
+        }
+      }
+    }
+
+    container dns-resolver {
+      description
+        "Configuration of the DNS resolver.";
+
+      leaf-list search {
+        type inet:domain-name;
+        ordered-by user;
+        description
+          "An ordered list of domains to search when resolving
+           a host name.";
+      }
+      list server {
+        key name;
+        ordered-by user;
+        description
+          "List of the DNS servers that the resolver should query.
+
+           When the resolver is invoked by a calling application, it
+           sends the query to the first name server in this list.  If
+           no response has been received within 'timeout' seconds,
+           the resolver continues with the next server in the list.
+           If no response is received from any server, the resolver
+           continues with the first server again.  When the resolver
+           has traversed the list 'attempts' times without receiving
+           any response, it gives up and returns an error to the
+           calling application.
+
+           Implementations MAY limit the number of entries in this
+           list.";
+
+        leaf name {
+          type string;
+          description
+            "An arbitrary name for the DNS server.";
+        }
+        choice transport {
+          mandatory true;
+          description
+            "The transport-protocol-specific parameters for this
+             server.";
+
+          case udp-and-tcp {
+            container udp-and-tcp {
+              description
+                "Contains UDP- and TCP-specific configuration
+                 parameters for DNS.";
+              reference
+                "RFC 1035: Domain Names - Implementation and
+                           Specification
+                 RFC 5966: DNS Transport over TCP - Implementation
+                           Requirements";
+
+              leaf address {
+                type inet:ip-address;
+                mandatory true;
+                description
+                  "The address of the DNS server.";
+              }
+              leaf port {
+                if-feature dns-udp-tcp-port;
+                type inet:port-number;
+                default 53;
+                description
+                  "The UDP and TCP port number of the DNS server.";
+              }
+            }
+          }
+        }
+      }
+      container options {
+        description
+          "Resolver options.  The set of available options has been
+           limited to those that are generally available across
+           different resolver implementations and generally useful.";
+        leaf timeout {
+          type uint8 {
+            range "1..max";
+          }
+          units "seconds";
+          default "5";
+          description
+            "The amount of time the resolver will wait for a
+             response from each remote name server before
+             retrying the query via a different name server.";
+        }
+        leaf attempts {
+          type uint8 {
+            range "1..max";
+          }
+          default "2";
+          description
+            "The number of times the resolver will send a query to
+             all of its name servers before giving up and returning
+             an error to the calling application.";
+        }
+      }
+    }
+
+    container radius {
+      if-feature radius;
+
+      description
+        "Configuration of the RADIUS client.";
+
+      list server {
+        key name;
+        ordered-by user;
+        description
+          "List of RADIUS servers used by the device.
+
+           When the RADIUS client is invoked by a calling
+           application, it sends the query to the first server in
+           this list.  If no response has been received within
+           'timeout' seconds, the client continues with the next
+           server in the list.  If no response is received from any
+           server, the client continues with the first server again.
+           When the client has traversed the list 'attempts' times
+           without receiving any response, it gives up and returns an
+           error to the calling application.";
+
+        leaf name {
+          type string;
+          description
+            "An arbitrary name for the RADIUS server.";
+        }
+        choice transport {
+          mandatory true;
+          description
+            "The transport-protocol-specific parameters for this
+             server.";
+
+          case udp {
+            container udp {
+              description
+                "Contains UDP-specific configuration parameters
+                 for RADIUS.";
+              leaf address {
+                type inet:host;
+                mandatory true;
+                description
+                  "The address of the RADIUS server.";
+              }
+
+              leaf authentication-port {
+                type inet:port-number;
+                default "1812";
+                description
+                  "The port number of the RADIUS server.";
+              }
+              leaf shared-secret {
+                type string;
+                mandatory true;
+                nacm:default-deny-all;
+                description
+                  "The shared secret, which is known to both the
+                   RADIUS client and server.";
+                reference
+                  "RFC 2865: Remote Authentication Dial In User
+                             Service (RADIUS)";
+              }
+            }
+          }
+        }
+        leaf authentication-type {
+          type identityref {
+            base radius-authentication-type;
+          }
+          default radius-pap;
+          description
+            "The authentication type requested from the RADIUS
+             server.";
+        }
+      }
+      container options {
+        description
+          "RADIUS client options.";
+
+        leaf timeout {
+          type uint8 {
+            range "1..max";
+          }
+          units "seconds";
+          default "5";
+          description
+            "The number of seconds the device will wait for a
+             response from each RADIUS server before trying with a
+             different server.";
+        }
+
+        leaf attempts {
+          type uint8 {
+            range "1..max";
+          }
+          default "2";
+          description
+            "The number of times the device will send a query to
+             all of its RADIUS servers before giving up.";
+        }
+      }
+    }
+
+    container authentication {
+      nacm:default-deny-write;
+      if-feature authentication;
+
+       description
+         "The authentication configuration subtree.";
+
+       leaf-list user-authentication-order {
+         type identityref {
+           base authentication-method;
+         }
+         must '(. != "sys:radius" or ../../radius/server)' {
+           error-message
+             "When 'radius' is used, a RADIUS server"
+           + " must be configured.";
+           description
+             "When 'radius' is used as an authentication method,
+              a RADIUS server must be configured.";
+         }
+         ordered-by user;
+
+         description
+           "When the device authenticates a user with a password,
+            it tries the authentication methods in this leaf-list in
+            order.  If authentication with one method fails, the next
+            method is used.  If no method succeeds, the user is
+            denied access.
+
+            An empty user-authentication-order leaf-list still allows
+            authentication of users using mechanisms that do not
+            involve a password.
+
+            If the 'radius-authentication' feature is advertised by
+            the NETCONF server, the 'radius' identity can be added to
+            this list.
+
+            If the 'local-users' feature is advertised by the
+            NETCONF server, the 'local-users' identity can be
+            added to this list.";
+       }
+
+       list user {
+         if-feature local-users;
+         key name;
+         description
+           "The list of local users configured on this device.";
+
+         leaf name {
+           type string;
+           description
+            "The user name string identifying this entry.";
+         }
+         leaf password {
+           type ianach:crypt-hash;
+           description
+             "The password for this entry.";
+         }
+         list authorized-key {
+           key name;
+           description
+             "A list of public SSH keys for this user.  These keys
+              are allowed for SSH authentication, as described in
+              RFC 4253.";
+           reference
+             "RFC 4253: The Secure Shell (SSH) Transport Layer
+                        Protocol";
+
+           leaf name {
+             type string;
+             description
+               "An arbitrary name for the SSH key.";
+           }
+
+           leaf algorithm {
+             type string;
+             mandatory true;
+             description
+               "The public key algorithm name for this SSH key.
+
+                Valid values are the values in the IANA 'Secure Shell
+                (SSH) Protocol Parameters' registry, Public Key
+                Algorithm Names.";
+             reference
+               "IANA 'Secure Shell (SSH) Protocol Parameters'
+                registry, Public Key Algorithm Names";
+           }
+           leaf key-data {
+             type binary;
+             mandatory true;
+             description
+               "The binary public key data for this SSH key, as
+                specified by RFC 4253, Section 6.6, i.e.:
+
+                  string    certificate or public key format
+                            identifier
+                  byte[n]   key/certificate data.";
+             reference
+               "RFC 4253: The Secure Shell (SSH) Transport Layer
+                          Protocol";
+           }
+         }
+       }
+     }
+  }
+
+  /*
+   * Operational state data nodes
+   */
+
+  container system-state {
+    config false;
+    description
+      "System group operational state.";
+
+    container platform {
+      description
+        "Contains vendor-specific information for
+         identifying the system platform and operating system.";
+      reference
+        "IEEE Std 1003.1-2008 - sys/utsname.h";
+
+      leaf os-name {
+        type string;
+        description
+          "The name of the operating system in use -
+           for example, 'Linux'.";
+        reference
+          "IEEE Std 1003.1-2008 - utsname.sysname";
+      }
+      leaf os-release {
+        type string;
+        description
+          "The current release level of the operating
+           system in use.  This string MAY indicate
+           the OS source code revision.";
+        reference
+          "IEEE Std 1003.1-2008 - utsname.release";
+      }
+      leaf os-version {
+        type string;
+        description
+          "The current version level of the operating
+           system in use.  This string MAY indicate
+           the specific OS build date and target variant
+           information.";
+        reference
+          "IEEE Std 1003.1-2008 - utsname.version";
+      }
+      leaf machine {
+        type string;
+        description
+          "A vendor-specific identifier string representing
+           the hardware in use.";
+        reference
+          "IEEE Std 1003.1-2008 - utsname.machine";
+      }
+    }
+
+    container clock {
+      description
+        "Monitoring of the system date and time properties.";
+
+      leaf current-datetime {
+        type yang:date-and-time;
+        description
+          "The current system date and time.";
+      }
+
+      leaf boot-datetime {
+        type yang:date-and-time;
+        description
+          "The system date and time when the system last restarted.";
+      }
+    }
+  }
+
+  rpc set-current-datetime {
+    nacm:default-deny-all;
+    description
+      "Set the /system-state/clock/current-datetime leaf
+       to the specified value.
+
+       If the system is using NTP (i.e., /system/ntp/enabled
+       is set to 'true'), then this operation will fail with
+       error-tag 'operation-failed' and error-app-tag value of
+       'ntp-active'.";
+    input {
+      leaf current-datetime {
+        type yang:date-and-time;
+        mandatory true;
+        description
+          "The current system date and time.";
+      }
+    }
+  }
+
+  rpc system-restart {
+    nacm:default-deny-all;
+    description
+      "Request that the entire system be restarted immediately.
+       A server SHOULD send an rpc reply to the client before
+       restarting the system.";
+  }
+
+  rpc system-shutdown {
+    nacm:default-deny-all;
+    description
+      "Request that the entire system be shut down immediately.
+       A server SHOULD send an rpc reply to the client before
+       shutting down the system.";
+  }
+
+}