feat: Add system user authentication and accounting settings resource

examples/resources/routeros_system_user_aaa/import.sh

@@ -0,0 +1 @@
+terraform import routeros_system_user_aaa.settings .

examples/resources/routeros_system_user_aaa/resource.tf

@@ -0,0 +1,3 @@
+resource "routeros_system_user_aaa" "settings" {
+  use_radius = true
+}

routeros/provider.go

@@ -140,6 +140,7 @@ func Provider() *schema.Provider {
 			"routeros_system_ntp_server":    ResourceSystemNtpServer(),
 			"routeros_system_scheduler":     ResourceSystemScheduler(),
 			"routeros_system_user":          ResourceUser(),
+			"routeros_system_user_aaa":      ResourceUserAaa(),
 			"routeros_system_user_group":    ResourceUserGroup(),
 			"routeros_system_user_settings": ResourceSystemUserSettings(),
 

routeros/resource_system_user_aaa.go

@@ -0,0 +1,68 @@
+package routeros
+
+import (
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+)
+
+/*
+{
+    "accounting": "true",
+    "default-group": "read",
+    "exclude-groups": "full",
+    "interim-update": "0s",
+    "use-radius": "false"
+}
+*/
+
+// https://help.mikrotik.com/docs/display/ROS/User#User-RemoteAAA
+func ResourceUserAaa() *schema.Resource {
+	resSchema := map[string]*schema.Schema{
+		MetaResourcePath: PropResourcePath("/user/aaa"),
+		MetaId:           PropId(Id),
+
+		"accounting": {
+			Type:        schema.TypeBool,
+			Optional:    true,
+			Default:     true,
+			Description: "An option that enables accounting for users.",
+		},
+		"default_group": {
+			Type:        schema.TypeString,
+			Optional:    true,
+			Default:     "read",
+			Description: "The user group that is used by default for users authenticated via a RADIUS server.",
+		},
+		"exclude_groups": {
+			Type:        schema.TypeSet,
+			Optional:    true,
+			Elem:        &schema.Schema{Type: schema.TypeString},
+			Description: "A set of groups that are not allowed for users authenticated by RADIUS.",
+		},
+		"interim_update": {
+			Type:             schema.TypeString,
+			Optional:         true,
+			Default:          "0s",
+			Description:      "Interval between scheduled RADIUS Interim-Update messages.",
+			DiffSuppressFunc: TimeEquall,
+		},
+		"use_radius": {
+			Type:        schema.TypeBool,
+			Optional:    true,
+			Default:     false,
+			Description: "An option whether to use RADIUS server.",
+		},
+	}
+
+	return &schema.Resource{
+		CreateContext: DefaultSystemCreate(resSchema),
+		ReadContext:   DefaultSystemRead(resSchema),
+		UpdateContext: DefaultSystemUpdate(resSchema),
+		DeleteContext: DefaultSystemDelete(resSchema),
+
+		Importer: &schema.ResourceImporter{
+			StateContext: schema.ImportStatePassthroughContext,
+		},
+
+		Schema: resSchema,
+	}
+}