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local datafiles = require "datafiles"
local netbios = require "netbios"
local nmap = require "nmap"
local stdnse = require "stdnse"
local string = require "string"
local table = require "table"
description = [[
Attempts to retrieve the target's NetBIOS names and MAC address.
By default, the script displays the name of the computer and the logged-in
user; if the verbosity is turned up, it displays all names the system thinks it
owns.
]]
---
-- @usage
-- sudo nmap -sU --script nbstat.nse -p137 <host>
--
-- @output
-- Host script results:
-- |_ nbstat: NetBIOS name: WINDOWS2003, NetBIOS user: <unknown>, NetBIOS MAC: 00:0c:29:c6:da:f5 (VMware)
--
-- Host script results:
-- | nbstat: NetBIOS name: WINDOWS2003, NetBIOS user: <unknown>, NetBIOS MAC: 00:0c:29:c6:da:f5 (VMware)
-- | Names:
-- | WINDOWS2003<00> Flags: <unique><active>
-- | WINDOWS2003<20> Flags: <unique><active>
-- | SKULLSECURITY<00> Flags: <group><active>
-- | SKULLSECURITY<1e> Flags: <group><active>
-- | SKULLSECURITY<1d> Flags: <unique><active>
-- |_ \x01\x02__MSBROWSE__\x02<01> Flags: <group><active>
--
-- @xmloutput
-- <elem key="server_name">WINDOWS2003</elem>
-- <elem key="workstation_name">WINDOWS2003</elem>
-- <elem key="user"><unknown></elem>
-- <table key="mac">
-- <elem key="manuf">VMware</elem>
-- <elem key="address">00:0c:29:c6:da:f5</elem>
-- </table>
-- <table key="Names">
-- <table>
-- <elem key="name">WINDOWS2003</elem>
-- <elem key="suffix">0</elem>
-- <elem key="flags">1024</elem>
-- </table>
-- <table>
-- <elem key="name">SKULLSECURITY</elem>
-- <elem key="suffix">0</elem>
-- <elem key="flags">33792</elem>
-- </table>
-- <table>
-- <elem key="name">WINDOWS2003</elem>
-- <elem key="suffix">32</elem>
-- <elem key="flags">1024</elem>
-- </table>
-- <table>
-- <elem key="name">SKULLSECURITY</elem>
-- <elem key="suffix">30</elem>
-- <elem key="flags">33792</elem>
-- </table>
-- <table>
-- <elem key="name">SKULLSECURITY</elem>
-- <elem key="suffix">29</elem>
-- <elem key="flags">1024</elem>
-- </table>
-- <table>
-- <elem key="name">\x01\x02__MSBROWSE__\x02</elem>
-- <elem key="suffix">1</elem>
-- <elem key="flags">33792</elem>
-- </table>
-- </table>
-- <table key="Statistics">
-- <elem>00 0c 29 c6 da f5 00 00 00 00 00 00 00 00 00 00 00</elem>
-- <elem>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00</elem>
-- <elem>00 00 00 00 00 00 00 00 00 00 00 00 00 00</elem>
-- </table>
author = {"Brandon Enright", "Ron Bowes"}
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
-- Current version of this script was based entirely on Implementing CIFS, by
-- Christopher R. Hertel.
categories = {"default", "discovery", "safe"}
hostrule = function(host)
-- The following is an attempt to only run this script against hosts
-- that will probably respond to a UDP 137 probe. One might argue
-- that sending a single UDP packet and waiting for a response is no
-- big deal and that it should be done for every host. In that case
-- simply change this rule to always return true.
local port_t135 = nmap.get_port_state(host,
{number=135, protocol="tcp"})
local port_t139 = nmap.get_port_state(host,
{number=139, protocol="tcp"})
local port_t445 = nmap.get_port_state(host,
{number=445, protocol="tcp"})
local port_u137 = nmap.get_port_state(host,
{number=137, protocol="udp"})
return (port_t135 ~= nil and port_t135.state == "open") or
(port_t139 ~= nil and port_t139.state == "open") or
(port_t445 ~= nil and port_t445.state == "open") or
(port_u137 ~= nil and
(port_u137.state == "open" or
port_u137.state == "open|filtered"))
end
action = function(host)
-- Get the list of NetBIOS names
local status, names, statistics = netbios.do_nbstat(host)
status, names, statistics = netbios.do_nbstat(host)
status, names, statistics = netbios.do_nbstat(host)
status, names, statistics = netbios.do_nbstat(host)
if(status == false) then
return stdnse.format_output(false, names)
end
-- Get the server name
local status, server_name = netbios.get_server_name(host, names)
if(status == false) then
return stdnse.format_output(false, server_name)
end
-- Get the workstation name
local status, workstation_name = netbios.get_workstation_name(host, names)
if(status == false) then
return stdnse.format_output(false, workstation_name)
end
-- Get the logged in user
local status, user_name = netbios.get_user_name(host, names)
if(status == false) then
return stdnse.format_output(false, user_name)
end
-- Format the Mac address in the standard way
local mac = {
address = "<unknown>",
manuf = "unknown"
}
if(#statistics >= 6) then
local status, mac_prefixes = datafiles.parse_mac_prefixes()
if not status then
-- Oh well
mac_prefixes = {}
end
-- MAC prefixes are matched on the first three bytes, all uppercase
local prefix = string.upper(stdnse.tohex(statistics:sub(1,3)))
mac.address = stdnse.format_mac(statistics:sub(1,6))
mac.manuf = mac_prefixes[prefix] or "unknown"
host.registry['nbstat'] = {
server_name = server_name,
workstation_name = workstation_name,
mac = mac.address
}
-- Samba doesn't set the Mac address, and nmap-mac-prefixes shows that as Xerox
if(mac.address == "00:00:00:00:00:00") then
mac.address = "<unknown>"
mac.manuf = "unknown"
end
end
setmetatable(mac, {
-- MAC is formatted as "00:11:22:33:44:55 (Manufacturer)"
__tostring=function(t) return string.format("%s (%s)", t.address, t.manuf) end
})
-- Check if we actually got a username
if(user_name == nil) then
user_name = "<unknown>"
end
local response = {
server_name = server_name,
workstation_name = workstation_name,
user = user_name,
mac = mac,
}
local names_output = {}
for i = 1, #names, 1 do
local name = names[i]
setmetatable(name, {
__tostring = function(t)
-- Tabular format with padding
return string.format("%s<%02x>%sFlags: %s",
t['name'], t['suffix'],
string.rep(" ", 17 - #t['name']),
netbios.flags_to_string(t['flags']))
end
})
table.insert(names_output, name)
end
setmetatable(names_output, {
__tostring = function(t)
local ret = {}
for i,v in ipairs(t) do
table.insert(ret, tostring(v))
end
-- Indent Names table by 2 spaces
return " " .. table.concat(ret, "\n ")
end
})
response["names"] = names_output
local statistics_output = {}
for i = 1, #statistics, 16 do
--Format statistics as space-separated hex bytes, 16 columns
table.insert(statistics_output,
stdnse.tohex(string.sub(statistics,i,i+16), {separator = " "})
)
end
response["statistics"] = statistics_output
setmetatable(response, {
__tostring = function(t)
-- Normal single-line result
local ret = {string.format("NetBIOS name: %s, NetBIOS user: %s, NetBIOS MAC: %s", t.server_name or t.workstation_name, t.user, t.mac)}
-- If verbosity is set, dump the whole list of names
if nmap.verbosity() >= 1 then
table.insert(ret, string.format("Names:\n%s",t.names))
-- If super verbosity is set, print out the full statistics
if nmap.verbosity() >= 2 then
-- Indent Statistics table by 2 spaces
table.insert(ret, string.format("Statistics:\n %s",table.concat(t.statistics,"\n ")))
end
end
return table.concat(ret, "\n")
end
})
return tostring(response)
end
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