Change reporting_user role to leverage reserved kibana privileges (elastic#132766)

* Change reporting_user role to leverage reserved kibana privileges

* [CI] Auto commit changes from spotless

* Mark reporting_user role as deprecated

* Update docs/changelog/132766.yaml

* Update release notes

---------

Co-authored-by: elasticsearchmachine <[email protected]>

Author: legrego

docs/changelog/132766.yaml

@@ -0,0 +1,10 @@
+pr: 132766
+summary: Change `reporting_user` role to leverage reserved kibana privileges
+area: Authorization
+type: deprecation
+issues: []
+deprecation:
+  title: Deprecate the built-in `reporting_user` role.
+  area: Authorization
+  details: The `reporting_user` role is deprecated. Administrators should manage access to Kibana's reporting features via custom roles which grant the necessary privileges.
+  impact: This role will be removed in a future version. Administrators should migrate to custom roles to avoid interruption.

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStore.java

@@ -314,23 +314,13 @@ private static Map<String, RoleDescriptor> initializeReservedRoles() {
                     null,
                     new RoleDescriptor.ApplicationResourcePrivileges[] {
                         RoleDescriptor.ApplicationResourcePrivileges.builder()
-                            .application("kibana-.kibana")
+                            .application("kibana-*")
                             .resources("*")
-                            .privileges(
-                                "feature_discover.minimal_read",
-                                "feature_discover.generate_report",
-                                "feature_dashboard.minimal_read",
-                                "feature_dashboard.generate_report",
-                                "feature_dashboard.download_csv_report",
-                                "feature_canvas.minimal_read",
-                                "feature_canvas.generate_report",
-                                "feature_visualize.minimal_read",
-                                "feature_visualize.generate_report"
-                            )
+                            .privileges("reserved_reporting_user")
                             .build() },
                     null,
                     null,
-                    MetadataUtils.DEFAULT_RESERVED_METADATA,
+                    MetadataUtils.getDeprecatedReservedMetadata("Please grant access via Kibana privileges instead."),
                     null,
                     null,
                     null,
@@ -339,7 +329,7 @@ private static Map<String, RoleDescriptor> initializeReservedRoles() {
                         + "including generating and downloading reports. "
                         + "This role implicitly grants access to all Kibana reporting features, "
                         + "with each user having access only to their own reports. Note that reporting users should also be assigned "
-                        + "additional roles that grant read access to the indices that will be used to generate reports."
+                        + "additional roles that grant read access to Kibana, and the indices that will be used to generate reports."
                 )
             ),
             entry(KibanaSystemUser.ROLE_NAME, kibanaSystemRoleDescriptor(KibanaSystemUser.ROLE_NAME)),

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java

@@ -2728,20 +2728,11 @@ public void testReportingUserRole() {
         RoleDescriptor roleDescriptor = ReservedRolesStore.roleDescriptor("reporting_user");
         assertNotNull(roleDescriptor);
         assertThat(roleDescriptor.getMetadata(), hasEntry("_reserved", true));
+        assertThat(roleDescriptor.getMetadata(), hasEntry("_deprecated", true));
 
         final String applicationName = "kibana-.kibana";
 
-        final Set<String> applicationPrivilegeNames = Set.of(
-            "feature_discover.minimal_read",
-            "feature_discover.generate_report",
-            "feature_dashboard.minimal_read",
-            "feature_dashboard.generate_report",
-            "feature_dashboard.download_csv_report",
-            "feature_canvas.minimal_read",
-            "feature_canvas.generate_report",
-            "feature_visualize.minimal_read",
-            "feature_visualize.generate_report"
-        );
+        final Set<String> applicationPrivilegeNames = Set.of("reserved_reporting_user");
 
         final Set<String> allowedApplicationActionPatterns = Set.of(
             "login:",