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local comm = require "comm"
local nmap = require "nmap"
local shortport = require "shortport"
local string = require "string"
description = [[
Attempts to extract system information from the point-to-point tunneling protocol (PPTP) service.
]]
-- rev 0.2 (11-14-2007)
---
-- @output
-- PORT STATE SERVICE VERSION
-- 1723/tcp open pptp YAMAHA Corporation (Firmware: 32838)
-- Service Info: Host: RT57i
author = "Thomas Buchanan"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"version"}
portrule = shortport.version_port_or_service(1723)
action = function(host, port)
-- build a PPTP Start-Control-Connection-Request packet
-- copied from packet capture of pptp exchange
-- for details of packet structure, see http://www.ietf.org/rfc/rfc2637.txt
local payload = "\000\156\000\001\026\043\060\077" .. -- length=156, Message type=control, cookie
"\000\001\000\000\001\000\000\000" .. -- Control type=Start-Control-Connection-Request, Reserved, Protocol=1.0, Reserverd
"\000\000\000\001\000\000\000\001" .. -- Framing Capabilities, Bearer Capabilities
"\255\255\000\001" .. "none" .. -- Maximum channels, firmware version, hostname
"\000\000\000\000\000\000\000\000" .. -- padding for hostname
"\000\000\000\000\000\000\000\000" .. -- padding for hostname
"\000\000\000\000\000\000\000\000" .. -- padding for hostname
"\000\000\000\000\000\000\000\000" .. -- padding for hostname
"\000\000\000\000\000\000\000\000" .. -- padding for hostname
"\000\000\000\000\000\000\000\000" .. -- padding for hostname
"\000\000\000\000\000\000\000\000" .. -- padding for hostname
"\000\000\000\000" .. "nmap" .. -- padding for hostname, vendor name
"\000\000\000\000\000\000\000\000" .. -- padding for vendor name
"\000\000\000\000\000\000\000\000" .. -- padding for vendor name
"\000\000\000\000\000\000\000\000" .. -- padding for vendor name
"\000\000\000\000\000\000\000\000" .. -- padding for vendor name
"\000\000\000\000\000\000\000\000" .. -- padding for vendor name
"\000\000\000\000\000\000\000\000" .. -- padding for vendor name
"\000\000\000\000\000\000\000\000" .. -- padding for vendor name
"\000\000\000\000"; -- padding for vendor name
local try = nmap.new_try()
local response = try(comm.exchange(host, port, payload, {timeout=5000}))
local result
-- check to see if the packet we got back matches the beginning of a PPTP Start-Control-Connection-Reply packet
result = string.match(response, "\0\156\0\001\026\043(.*)")
local output
if result ~= nil then
local firmware
local hostname
local vendor
-- get the firmware version (2 octets)
local s1,s2
s1,s2 = string.byte(result, 22, 23)
firmware = s1 * 256 + s2
-- get the hostname (64 octets)
local s3
s3 = string.sub(result, 24, 87)
hostname = string.match(s3, "(.-)\0")
-- get the vendor (should be 64 octets, but capture to end of the string to be safe)
local s4, length
length = #result
s4 = string.sub(result, 88, length)
vendor = string.match(s4, "(.-)\0")
port.version.name = "pptp"
port.version.name_confidence = 10
if vendor ~= nil then port.version.product = vendor end
if firmware ~= 0 then port.version.version = "(Firmware: " .. firmware .. ")" end
if hostname ~= nil then port.version.hostname = hostname end
port.version.service_tunnel = "none"
nmap.set_port_version(host, port)
end
end