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--
-- (C) 2019-22 - ntop.org
--
-- ##############################################
local host_alert_keys = require "host_alert_keys"
local alert_creators = require "alert_creators"
local json = require("dkjson")
-- Import the classes library.
local classes = require "classes"
-- Make sure to import the Superclass!
local alert = require "alert"
-- ##############################################
local host_alert_flow_anomaly = classes.class(alert)
-- ##############################################
host_alert_flow_anomaly.meta = {
alert_key = host_alert_keys.host_alert_flows_anomaly,
i18n_title = "alerts_dashboard.flow_anomaly",
icon = "fas fa-fw fa-life-ring",
has_attacker = true,
}
-- ##############################################
-- @brief Prepare an alert table used to generate the alert
-- @return A table with the alert built
function host_alert_flow_anomaly:init()
-- Call the parent constructor
self.super:init()
self.alert_type_params = {}
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 host_alert_flow_anomaly.format(ifid, alert, alert_type_params)
local is_both = alert_type_params["is_both"]
local is_client_alert = alert_type_params["is_client_alert"]
local role
if(is_both) then
role = i18n("client_and_server")
elseif(is_client_alert) then
role = i18n("client")
else
role = i18n("server")
end
return i18n("alert_messages.flow_number_anomaly", {
role = role,
value = alert_type_params["value"],
lower_bound = alert_type_params["lower_bound"],
upper_bound = alert_type_params["upper_bound"],
})
end
-- #######################################################
-- @brief Prepare a table containing a set of filters useful to query historical flows that contributed to the generation of this alert
-- @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 host_alert_flow_anomaly.filter_to_past_flows(ifid, alert, alert_type_params)
local res = {}
local host_key = hostinfo2hostkey({ip = alert["ip"], vlan = alert["vlan_id"]})
-- Filter by client or server, depending on whether this alert is as-client or as-server
if alert["is_client"] == true or alert["is_client"] == "1" then
res["cli_ip"] = host_key
elseif alert["is_server"] == true or alert["is_server"] == "1" then
res["srv_ip"] = host_key
end
-- No other filter can be set
return res
end
-- #######################################################
return host_alert_flow_anomaly
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