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local comm = require "comm"
local shortport = require "shortport"
description = [[
Checks for an identd (auth) server which is spoofing its replies.
Tests whether an identd (auth) server responds with an answer before
we even send the query. This sort of identd spoofing can be a sign of
malware infection, though it can also be used for legitimate privacy
reasons.
]]
---
-- @output
-- PORT STATE SERVICE REASON
-- 113/tcp open auth syn-ack
-- |_auth-spoof: Spoofed reply: 0, 0 : USERID : UNIX : OGJdvM
author = "Diman Todorov"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"malware", "safe"}
portrule = shortport.port_or_service(113, "auth")
action = function(host, port)
local status, owner = comm.get_banner(host, port, {lines=1})
if not status then
return
end
return "Spoofed reply: " .. owner
end
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