Added gateway alert and configuration (#8687); Fixes nedge compilation issue

scripts/lua/modules/alert_definitions/flow/alert_unexpected_gateway.lua

@@ -0,0 +1,60 @@
+--
+-- (C) 2019-24 - ntop.org
+--
+
+-- ##############################################
+
+local flow_alert_keys = require "flow_alert_keys"
+-- Import the classes library.
+local classes = require "classes"
+-- Make sure to import the Superclass!
+local alert = require "alert"
+-- Import Mitre Att&ck utils
+local mitre = require "mitre_utils"
+
+-- ##############################################
+
+local alert_unexpected_gateway = classes.class(alert)
+
+-- ##############################################
+
+alert_unexpected_gateway.meta = {
+   alert_key = flow_alert_keys.flow_alert_unexpected_gateway,
+   i18n_title = "flow_alerts_explorer.alert_unexpected_gateway_title",
+   icon = "fas fa-fw fa-exclamation",
+
+   -- Mitre Att&ck Matrix values
+   mitre_values = {
+      mitre_tactic = mitre.tactic.defense_evasion,
+      mitre_technique = mitre.technique.rogue_domain_controller,
+      mitre_id = "T1207"
+   },
+
+   has_attacker = true,
+}
+
+-- ##############################################
+
+-- @brief Prepare an alert table used to generate the alert
+-- @param one_flow_param The first alert param
+-- @param another_flow_param The second alert param
+-- @return A table with the alert built
+function alert_unexpected_gateway:init()
+   -- Call the parent constructor
+   self.super:init()
+end
+
+-- #######################################################
+
+-- @brief Format an alert into a human-readable string
+-- @param ifid The integer interface id of the generated alert
+-- @param alert The alert description table, including alert data such as the generating entity, timestamp, granularity, type
+-- @param alert_type_params Table `alert_type_params` as built in the `:init` method
+-- @return A human-readable string
+function alert_unexpected_gateway.format(ifid, alert, alert_type_params)
+    return(i18n("flow_alerts_explorer.status_unexpected_gateway_description", { server=alert_type_params.server_ip} ))
+end
+
+-- #######################################################
+
+return alert_unexpected_gateway