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Migrates alerts to an object-oriented implementation

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Migrates alert_malicious_signature alert_elephant_local_to_remote alert_elephant_remote_to_local

Migrates long_lived

Migrates alert_flow_blocked

Migrates alert_tls_old_version

Migrates alert_tls_certificate_mismatch

Migrates alert_tls_certificate_expired

Migrates alert_tls_unsafe_ciphers

Migrates alert_tls_certificate_selfsigned

Migrates alert_potentially_dangerous_protocol

Migrates alert_snmp_device_reset

Migrates alert_port_mac_changed

Migrates alert_port_duplexstatus_change

Mirgates alert_port_errors

Migrates alert_port_status_change

Migrates alert_port_load_threshold_exceeded

Migrates alert_data_exfiltration

Migrates alert_dns_data_exfiltration

Migrates alert_suspicious_tcp_probing alert_suspicious_tcp_syn_probing alert_tcp_connection_refused

Migrates alert_dns_invalid_query

Migrates alert_attack_mitigation_via_snmp

Migrates alert_lateral_movement

Migrates alert_periodicity_update

Migrates alert_dns_positive_error_ratio

Migrates alert_iec104_error
This commit is contained in:
Simone Mainardi 2020-12-22 09:54:55 +01:00
parent 35a66a0c8a
commit 3baa932a01
50 changed files with 1495 additions and 812 deletions
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89
scripts/lua/modules/alert_definitions/alert_periodicity_update.lua
View file

@ -1,80 +1,85 @@
--
-- (C) 2020 - ntop.org
-- (C) 2019-20 - ntop.org
--
local alert_keys = require "alert_keys"
local format_utils = require "format_utils"
local json = require("dkjson")
-- ##############################################
-- #######################################################
local alert_keys = require "alert_keys"
-- Import the classes library.
local classes = require "classes"
-- Make sure to import the Superclass!
local alert = require "alert"
-- ##############################################
local alert_periodicity_update = classes.class(alert)
-- ##############################################
alert_periodicity_update.meta = {
alert_key = alert_keys.ntopng.alert_periodicity_update,
i18n_title = "alerts_dashboard.alert_periodicity_update",
icon = "fas fa-arrows-alt-h",
}
-- ##############################################
-- @brief Prepare an alert table used to generate the alert
-- @param alert_severity A severity as defined in `alert_severities`
-- @param alert_granularity A granularity as defined in `alert_consts.alerts_granularities`
-- @param last_error A table containing the last lateral movement error, e.g.,
-- {"event":"create","shost":"192.168.2.153","dhost":"224.0.0.68","dport":1968,"vlan_id":0,"l4":17,"l7":0,"first_seen":1602488355,"last_seen":1602488355,"num_uses":1}
-- @return A table with the alert built
local function createPeriodicityUpdateError(alert_severity, alert_granularity, last_error, created_or_removed)
-- Create a subtype, to avoid merging multiple lateral movement alerts together
local alert_subtype = last_error.shost .. "/" .. last_error.dhost .. "/" .. last_error.dport .. "/" .. last_error.l4 .. "/" .. last_error.l7
local threshold_type = {
alert_severity = alert_severity,
alert_subtype = alert_subtype,
alert_granularity = alert_granularity,
alert_type_params = {
error_msg = last_error,
created_or_removed = created_or_removed
},
}
function alert_periodicity_update:init(last_error, created_or_removed)
-- Call the paren constructor
self.super:init()
return threshold_type
self.alert_type_params = {
error_msg = last_error,
created_or_removed = created_or_removed
}
end
-- #######################################################
local function formatPeriodicityUpdateErrorMessage(ifid, alert, status)
local msg = status.error_msg
-- @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_periodicity_update.format(ifid, alert, alert_type_params)
local msg = alert_type_params.error_msg
local vlan_id = msg.vlan_id or 0
local client = {host = msg.shost, vlan = vlan_id}
local server = {host = msg.dhost, vlan = vlan_id}
local rsp
if status.created_or_removed == "create" then
if alert_type_params.created_or_removed == "create" then
rsp = "flow: "
rsp = rsp .. hostinfo2detailshref(client, nil, hostinfo2label(client))..
" <i class=\"fas fa-exchange-alt fa-lg\" aria-hidden=\"true\" data-original-title=\"\" title=\"\"></i> " ..
hostinfo2detailshref(server, nil, hostinfo2label(server))..
" ["..i18n("port")..": "..msg.dport.."]"
" <i class=\"fas fa-exchange-alt fa-lg\" aria-hidden=\"true\" data-original-title=\"\" title=\"\"></i> " ..
hostinfo2detailshref(server, nil, hostinfo2label(server))..
" ["..i18n("port")..": "..msg.dport.."]"
rsp = rsp .. "["..i18n("application")..": "..interface.getnDPIProtoName(msg.l7).."]"
if not isEmptyString(msg.info) then
rsp = rsp .. "[" .. msg.info .. "]"
rsp = rsp .. "[" .. msg.info .. "]"
end
rsp = rsp .. ", is now periodic (frequency " .. msg["frequency"] .. " seconds)"
else
rsp = "Periodic flow ended: "
rsp = rsp .. hostinfo2detailshref(client, nil, hostinfo2label(client))..
" <i class=\"fas fa-exchange-alt fa-lg\" aria-hidden=\"true\" data-original-title=\"\" title=\"\"></i> " ..
hostinfo2detailshref(server, nil, hostinfo2label(server))..
" ["..i18n("port")..": "..msg.dport.."]"
" <i class=\"fas fa-exchange-alt fa-lg\" aria-hidden=\"true\" data-original-title=\"\" title=\"\"></i> " ..
hostinfo2detailshref(server, nil, hostinfo2label(server))..
" ["..i18n("port")..": "..msg.dport.."]"
rsp = rsp .. "["..i18n("application")..": "..interface.getnDPIProtoName(msg.l7).."]"
if not isEmptyString(msg.info) then
rsp = rsp .. "[" .. msg.info .. "]"
rsp = rsp .. "[" .. msg.info .. "]"
end
end
return(rsp)
end
-- #######################################################
return {
alert_key = alert_keys.ntopng.alert_periodicity_update,
i18n_title = "alerts_dashboard.alert_periodicity_update",
i18n_description = formatPeriodicityUpdateErrorMessage,
icon = "fas fa-arrows-alt-h",
creator = createPeriodicityUpdateError,
}
return alert_periodicity_update