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141 lines
5.2 KiB
Lua
141 lines
5.2 KiB
Lua
--
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-- (C) 2019-26 - ntop.org
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--
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-- ##############################################
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local other_alert_keys = require "other_alert_keys"
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-- Import the classes library.
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local classes = require "classes"
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-- Make sure to import the Superclass!
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local alert = require "alert"
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local alert_entities = require "alert_entities"
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-- Import Mitre Att&ck utils
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local mitre = require "mitre_utils"
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-- ##############################################
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local alert_active_scan = classes.class(alert)
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alert_active_scan.meta = {
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alert_key = other_alert_keys.alert_active_scan,
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i18n_title = "alerts_dashboard.active_scan_title",
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icon = "fas fa-fw fa-exclamation-triangle",
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entities = {
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alert_entities.am_host,
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},
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-- Mitre Att&ck Matrix values
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mitre_values = {
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mitre_tactic = mitre.tactic.persistence,
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mitre_technique = mitre.technique.ext_remote_services,
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mitre_id = "T1133"
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},
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}
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-- ##############################################
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function alert_active_scan:init(differences_list)
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-- Call the parent constructor
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self.super:init()
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self.alert_type_params = differences_list
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-- Trick to set this alert as an active monitoring alert
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self.alert_type_params.threshold = 0
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self.alert_type_params.value = 0
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self.alert_type_params.measurement = differences_list.measurement
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end
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-- #######################################################
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-- Function to normalize values (check nil cases)
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local function normalize_values(primary_key, secondary_key)
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if (primary_key == nil) then
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return nil
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elseif (primary_key[secondary_key] == nil) then
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return nil
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else
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return primary_key[secondary_key]
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end
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end
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-- #######################################################
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-- @brief Format an alert into a human-readable string
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-- @param ifid The integer interface id of the generated alert
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-- @param alert The alert description table, including alert data such as the generating entity, timestamp, granularity, type
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-- @param alert_type_params Table `alert_type_params` as built in the `:init` method
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-- @param local_explorer Table `alert_type_params` as built in the `:init` method
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-- @return A human-readable string
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function alert_active_scan.format(ifid, alert, alert_type_params, local_explorer)
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local msg = ""
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-- case standard with scan_type == "TCP_PORTSCAN"
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if (alert_type_params.scan_type == "tcp_portscan" or alert_type_params.scan_type == "tcp_openports") then
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if (not isEmptyString(alert_type_params.tcp_ports_case)) then
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msg = msg .. i18n('active_scan.ports_changed_cases.'..alert_type_params.tcp_ports_case, {
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open_ports_num = normalize_values(alert_type_params.tcp_open_ports,"num"),
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open_ports = normalize_values(alert_type_params.tcp_open_ports,"ports"),
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closed_ports_num = normalize_values(alert_type_params.tcp_closed_ports,"num"),
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closed_ports = normalize_values(alert_type_params.tcp_closed_ports,"ports"),
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protocol = i18n("tcp")
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})
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msg = msg:gsub("%,", ", ")
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end
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elseif (alert_type_params.scan_type == "udp_portscan") then
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if (not isEmptyString(alert_type_params.udp_ports_case)) then
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msg = msg .. i18n('active_scan.ports_changed_cases.'..alert_type_params.udp_ports_case, {
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open_ports_num = normalize_values(alert_type_params.udp_open_ports,"num"),
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open_ports = normalize_values(alert_type_params.udp_open_ports,"ports"),
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closed_ports_num = normalize_values(alert_type_params.udp_closed_ports,"num"),
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closed_ports = normalize_values(alert_type_params.udp_closed_ports,"ports"),
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protocol = i18n("udp")
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})
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msg = msg:gsub("%,", ", ")
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end
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end
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-- message for host unreachable alert
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if (alert_type_params.is_up_check_case) then
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msg = msg .. i18n("active_scan.host_down_case", { host = alert_type_params.host })
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end
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-- message for host not configured alert
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if (alert_type_params.is_host_not_configured) then
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msg = msg .. i18n("active_scan.host_not_configured", {host = alert_type_params.host })
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end
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local host = alert_type_params.host_name
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if isEmptyString(host) then
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host = alert_type_params.host
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else
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if (not isIPv4(alert_type_params.host)) then
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host = string.format("%s <span class=\"badge bg-secondary\">%s</span>",host,i18n('ipv6'))
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end
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end
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local scan_type = alert_type_params.scan_type
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if scan_type == "tcp_openports" then
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scan_type = "tcp_portscan"
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end
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local scan_type_label = i18n(string.format("hosts_stats.page_scan_hosts.scan_type_list.%s",scan_type))
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local url = string.format("%s/lua/active_scan.lua?host=%s&scan_type=%s&scan_return_result=true&page=show_result&scan_date=%s",getHttpHost() .. ntop.getHttpPrefix(),alert_type_params.host,scan_type,alert_type_params.date)
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if (alert_type_params.epoch) then
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url = string.format("%s&epoch=%u",url,alert_type_params.epoch)
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end
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local alert_descr = i18n('active_scan.host_alert', { host = host, msg = msg, url = url, scan_type = scan_type_label })
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if(alert_type_params.is_up_check_case or alert_type_params.is_host_not_configured) then
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alert_descr = msg
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end
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return alert_descr
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end
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-- #######################################################
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return alert_active_scan
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