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local datafiles = require "datafiles"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
local stringaux = require "stringaux"
local table = require "table"
local rand = require "rand"
description = [[
Enumerates TFTP (trivial file transfer protocol) filenames by testing
for a list of common ones.
TFTP doesn't provide directory listings. This script tries to retrieve
filenames from a list. The list is composed of static names from the
file <code>tftplist.txt</code>, plus configuration filenames for Cisco
devices that change based on the target address, of the form
<code>A.B.C.X-confg</code> for an IP address A.B.C.D and for X in 0 to
255.
Use the <code>tftp-enum.filelist</code> script argument to search for
other static filenames.
This script is a reimplementation of tftptheft from
http://code.google.com/p/tftptheft/.
]]
---
-- @usage nmap -sU -p 69 --script tftp-enum.nse --script-args tftp-enum.filelist=customlist.txt <host>
--
-- @args filelist - file name with list of filenames to enumerate at tftp server
--
-- @output
-- PORT STATE SERVICE REASON
-- 69/udp open tftp script-set
-- | tftp-enum:
-- |_ bootrom.ld
author = "Alexander Rudakov"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = { "discovery", "intrusive" }
local REQUEST_ERROR = -1
local FILE_FOUND = 1
local FILE_NOT_FOUND = 2
portrule = shortport.portnumber(69, "udp")
-- return a new array containing the concatenation of all of its
-- parameters. Scaler parameters are included in place, and array
-- parameters have their values shallow-copied to the final array.
-- Note that userdata and function values are treated as scalar.
local function array_concat(...)
local t = {}
for n = 1, select("#", ...) do
local arg = select(n, ...)
if type(arg) == "table" then
for _, v in ipairs(arg) do
t[#t + 1] = v
end
else
t[#t + 1] = arg
end
end
return t
end
local generate_cisco_address_confg = function(base_address)
local filenames = {}
local octets = stringaux.strsplit("%.", base_address)
for i = 0, 255 do
local address_confg = octets[1] .. "." .. octets[2] .. "." .. octets[3] .. "." .. i .. "-confg"
table.insert(filenames, address_confg)
end
return filenames
end
local generate_filenames = function(host)
local customlist = stdnse.get_script_args('tftp-enum.filelist')
local cisco = false
local status, default_filenames = datafiles.parse_file(customlist or "nselib/data/tftplist.txt" , {})
if not status then
stdnse.debug1("Can not open file with tftp file names list")
return {}
else
for i, filename in ipairs(default_filenames) do
if filename:match('{[Mm][Aa][Cc]}') then
if not host.mac_addr then
goto next_filename
else
filename = filename:gsub('{M[Aa][Cc]}', string.upper(stdnse.tohex(host.mac_addr)))
filename = filename:gsub('{m[aA][cC]}', stdnse.tohex(host.mac_addr))
end
end
if filename:match('{cisco}') then
cisco = true
table.remove(default_filenames,i)
end
::next_filename::
end
if cisco == true then
local cisco_address_confg_filenames = generate_cisco_address_confg(host.ip)
return array_concat(default_filenames, cisco_address_confg_filenames)
end
end
return default_filenames
end
local create_tftp_file_request = function(filename)
return "\0\x01" .. filename .. "\0octet\0"
end
local check_file_present = function(host, port, filename)
stdnse.debug1("checking file %s", filename)
local file_request = create_tftp_file_request(filename)
local socket = nmap.new_socket()
socket:connect(host, port)
local status, lhost, lport, rhost, rport = socket:get_info()
stdnse.debug1("lhost: %s, lport: %s", lhost, lport);
if (not (status)) then
stdnse.debug1("error %s", lhost)
socket:close()
return REQUEST_ERROR
end
local bind_socket = nmap.new_socket("udp")
stdnse.debug1("local port = %d", lport)
socket:send(file_request)
socket:close()
local bindOK, error = bind_socket:bind(nil, lport)
stdnse.debug1("starting listener")
if (not (bindOK)) then
stdnse.debug1("Error in bind %s", error)
bind_socket:close()
return REQUEST_ERROR
end
local recvOK, data = bind_socket:receive()
if (not (recvOK)) then
stdnse.debug1("Error in receive %s", data)
bind_socket:close()
return REQUEST_ERROR
end
if (data:byte(1) == 0x00 and data:byte(2) == 0x03) then
bind_socket:close()
return FILE_FOUND
elseif (data:byte(1) == 0x00 and data:byte(2) == 0x05) then
bind_socket:close()
return FILE_NOT_FOUND
else
bind_socket:close()
return REQUEST_ERROR
end
return FILE_NOT_FOUND
end
local check_open_tftp = function(host, port)
local random_name = rand.random_string(8, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_")
local ret_value = check_file_present(host, port, random_name)
if (ret_value == FILE_FOUND or ret_value == FILE_NOT_FOUND) then
return true
else
return false
end
end
action = function(host, port)
if (not (check_open_tftp(host, port))) then
stdnse.debug1("tftp seems not active")
return
end
stdnse.debug1("tftp detected")
port.service = "tftp"
nmap.set_port_state(host, port, "open")
local results = {}
local filenames = generate_filenames(host)
for i, filename in ipairs(filenames) do
local request_status = check_file_present(host, port, filename)
if (request_status == FILE_FOUND) then
table.insert(results, filename)
end
end
return stdnse.format_output(true, results)
end
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