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+module ietf-netconf-acm {
+
+ namespace "urn:ietf:params:xml:ns:yang:ietf-netconf-acm";
+
+ prefix "nacm";
+
+ import ietf-yang-types {
+ prefix yang;
+ }
+
+ organization
+ "IETF NETCONF (Network Configuration) Working Group";
+
+ contact
+ "WG Web:
+ WG List:
+
+ WG Chair: Mehmet Ersue
+
+
+ WG Chair: Bert Wijnen
+
+
+ Editor: Andy Bierman
+
+
+ Editor: Martin Bjorklund
+ ";
+
+ description
+ "NETCONF Access Control Model.
+
+ Copyright (c) 2012 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 6536; see
+ the RFC itself for full legal notices.";
+
+ revision "2012-02-22" {
+ description
+ "Initial version";
+ reference
+ "RFC 6536: Network Configuration Protocol (NETCONF)
+ Access Control Model";
+ }
+
+ /*
+ * Extension statements
+ */
+
+ extension default-deny-write {
+ description
+ "Used to indicate that the data model node
+ represents a sensitive security system parameter.
+
+ If present, and the NACM module is enabled (i.e.,
+ /nacm/enable-nacm object equals 'true'), the NETCONF server
+ will only allow the designated 'recovery session' to have
+ write access to the node. An explicit access control rule is
+ required for all other users.
+
+ The 'default-deny-write' extension MAY appear within a data
+ definition statement. It is ignored otherwise.";
+ }
+
+ extension default-deny-all {
+ description
+ "Used to indicate that the data model node
+ controls a very sensitive security system parameter.
+
+ If present, and the NACM module is enabled (i.e.,
+ /nacm/enable-nacm object equals 'true'), the NETCONF server
+ will only allow the designated 'recovery session' to have
+ read, write, or execute access to the node. An explicit
+ access control rule is required for all other users.
+
+ The 'default-deny-all' extension MAY appear within a data
+ definition statement, 'rpc' statement, or 'notification'
+ statement. It is ignored otherwise.";
+ }
+
+ /*
+ * Derived types
+ */
+
+ typedef user-name-type {
+ type string {
+ length "1..max";
+ }
+ description
+ "General Purpose Username string.";
+ }
+
+ typedef matchall-string-type {
+ type string {
+ pattern "\*";
+ }
+ description
+ "The string containing a single asterisk '*' is used
+ to conceptually represent all possible values
+ for the particular leaf using this data type.";
+ }
+
+ typedef access-operations-type {
+ type bits {
+ bit create {
+ description
+ "Any protocol operation that creates a
+ new data node.";
+ }
+ bit read {
+ description
+ "Any protocol operation or notification that
+ returns the value of a data node.";
+ }
+ bit update {
+ description
+ "Any protocol operation that alters an existing
+ data node.";
+ }
+ bit delete {
+ description
+ "Any protocol operation that removes a data node.";
+ }
+ bit exec {
+ description
+ "Execution access to the specified protocol operation.";
+ }
+ }
+ description
+ "NETCONF Access Operation.";
+ }
+
+ typedef group-name-type {
+ type string {
+ length "1..max";
+ pattern "[^\*].*";
+ }
+ description
+ "Name of administrative group to which
+ users can be assigned.";
+ }
+
+ typedef action-type {
+ type enumeration {
+ enum permit {
+ description
+ "Requested action is permitted.";
+ }
+ enum deny {
+ description
+ "Requested action is denied.";
+ }
+ }
+ description
+ "Action taken by the server when a particular
+ rule matches.";
+ }
+
+ typedef node-instance-identifier {
+ type yang:xpath1.0;
+ description
+ "Path expression used to represent a special
+ data node instance identifier string.
+
+ A node-instance-identifier value is an
+ unrestricted YANG instance-identifier expression.
+ All the same rules as an instance-identifier apply
+ except predicates for keys are optional. If a key
+ predicate is missing, then the node-instance-identifier
+ represents all possible server instances for that key.
+
+ This XPath expression is evaluated in the following context:
+
+ o The set of namespace declarations are those in scope on
+ the leaf element where this type is used.
+
+ o The set of variable bindings contains one variable,
+ 'USER', which contains the name of the user of the current
+ session.
+
+ o The function library is the core function library, but
+ note that due to the syntax restrictions of an
+ instance-identifier, no functions are allowed.
+
+ o The context node is the root node in the data tree.";
+ }
+
+ /*
+ * Data definition statements
+ */
+
+ container nacm {
+ nacm:default-deny-all;
+
+ description
+ "Parameters for NETCONF Access Control Model.";
+
+ leaf enable-nacm {
+ type boolean;
+ default true;
+ description
+ "Enables or disables all NETCONF access control
+ enforcement. If 'true', then enforcement
+ is enabled. If 'false', then enforcement
+ is disabled.";
+ }
+
+ leaf read-default {
+ type action-type;
+ default "permit";
+ description
+ "Controls whether read access is granted if
+ no appropriate rule is found for a
+ particular read request.";
+ }
+
+ leaf write-default {
+ type action-type;
+ default "deny";
+ description
+ "Controls whether create, update, or delete access
+ is granted if no appropriate rule is found for a
+ particular write request.";
+ }
+
+ leaf exec-default {
+ type action-type;
+ default "permit";
+ description
+ "Controls whether exec access is granted if no appropriate
+ rule is found for a particular protocol operation request.";
+ }
+
+ leaf enable-external-groups {
+ type boolean;
+ default true;
+ description
+ "Controls whether the server uses the groups reported by the
+ NETCONF transport layer when it assigns the user to a set of
+ NACM groups. If this leaf has the value 'false', any group
+ names reported by the transport layer are ignored by the
+ server.";
+ }
+
+ leaf denied-operations {
+ type yang:zero-based-counter32;
+ config false;
+ mandatory true;
+ description
+ "Number of times since the server last restarted that a
+ protocol operation request was denied.";
+ }
+
+ leaf denied-data-writes {
+ type yang:zero-based-counter32;
+ config false;
+ mandatory true;
+ description
+ "Number of times since the server last restarted that a
+ protocol operation request to alter
+ a configuration datastore was denied.";
+ }
+
+ leaf denied-notifications {
+ type yang:zero-based-counter32;
+ config false;
+ mandatory true;
+ description
+ "Number of times since the server last restarted that
+ a notification was dropped for a subscription because
+ access to the event type was denied.";
+ }
+
+ container groups {
+ description
+ "NETCONF Access Control Groups.";
+
+ list group {
+ key name;
+
+ description
+ "One NACM Group Entry. This list will only contain
+ configured entries, not any entries learned from
+ any transport protocols.";
+
+ leaf name {
+ type group-name-type;
+ description
+ "Group name associated with this entry.";
+ }
+
+ leaf-list user-name {
+ type user-name-type;
+ description
+ "Each entry identifies the username of
+ a member of the group associated with
+ this entry.";
+ }
+ }
+ }
+
+ list rule-list {
+ key "name";
+ ordered-by user;
+ description
+ "An ordered collection of access control rules.";
+
+ leaf name {
+ type string {
+ length "1..max";
+ }
+ description
+ "Arbitrary name assigned to the rule-list.";
+ }
+ leaf-list group {
+ type union {
+ type matchall-string-type;
+ type group-name-type;
+ }
+ description
+ "List of administrative groups that will be
+ assigned the associated access rights
+ defined by the 'rule' list.
+
+ The string '*' indicates that all groups apply to the
+ entry.";
+ }
+
+ list rule {
+ key "name";
+ ordered-by user;
+ description
+ "One access control rule.
+
+ Rules are processed in user-defined order until a match is
+ found. A rule matches if 'module-name', 'rule-type', and
+ 'access-operations' match the request. If a rule
+ matches, the 'action' leaf determines if access is granted
+ or not.";
+
+ leaf name {
+ type string {
+ length "1..max";
+ }
+ description
+ "Arbitrary name assigned to the rule.";
+ }
+
+ leaf module-name {
+ type union {
+ type matchall-string-type;
+ type string;
+ }
+ default "*";
+ description
+ "Name of the module associated with this rule.
+
+ This leaf matches if it has the value '*' or if the
+ object being accessed is defined in the module with the
+ specified module name.";
+ }
+ choice rule-type {
+ description
+ "This choice matches if all leafs present in the rule
+ match the request. If no leafs are present, the
+ choice matches all requests.";
+ case protocol-operation {
+ leaf rpc-name {
+ type union {
+ type matchall-string-type;
+ type string;
+ }
+ description
+ "This leaf matches if it has the value '*' or if
+ its value equals the requested protocol operation
+ name.";
+ }
+ }
+ case notification {
+ leaf notification-name {
+ type union {
+ type matchall-string-type;
+ type string;
+ }
+ description
+ "This leaf matches if it has the value '*' or if its
+ value equals the requested notification name.";
+ }
+ }
+ case data-node {
+ leaf path {
+ type node-instance-identifier;
+ mandatory true;
+ description
+ "Data Node Instance Identifier associated with the
+ data node controlled by this rule.
+
+ Configuration data or state data instance
+ identifiers start with a top-level data node. A
+ complete instance identifier is required for this
+ type of path value.
+
+ The special value '/' refers to all possible
+ datastore contents.";
+ }
+ }
+ }
+
+ leaf access-operations {
+ type union {
+ type matchall-string-type;
+ type access-operations-type;
+ }
+ default "*";
+ description
+ "Access operations associated with this rule.
+
+ This leaf matches if it has the value '*' or if the
+ bit corresponding to the requested operation is set.";
+ }
+
+ leaf action {
+ type action-type;
+ mandatory true;
+ description
+ "The access control action associated with the
+ rule. If a rule is determined to match a
+ particular request, then this object is used
+ to determine whether to permit or deny the
+ request.";
+ }
+
+ leaf comment {
+ type string;
+ description
+ "A textual description of the access rule.";
+ }
+ }
+ }
+ }
+}
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