local datafiles = require "datafiles" local bin = require "bin" local coroutine = require "coroutine" local nmap = require "nmap" local os = require "os" local stdnse = require "stdnse" local string = require "string" local table = require "table" local target = require "target" local openssl = stdnse.silent_require "openssl" description = [[ Uses the Microsoft LLTD protocol to discover hosts on a local network. For more information on the LLTD protocol please refer to http://www.microsoft.com/whdc/connect/Rally/LLTD-spec.mspx ]] --- -- @usage -- nmap -e --script lltd-discovery -- -- @args lltd-discovery.interface string specifying which interface to do lltd discovery on. If not specified, all ethernet interfaces are tried. -- @args lltd-discover.timeout timespec specifying how long to listen for replies (default 30s) -- -- @output -- | lltd-discovery: -- | 192.168.1.64 -- | Hostname: acer-PC -- | Mac: 18:f4:6a:4f:de:a2 (Hon Hai Precision Ind. Co.) -- | IPv6: fe80:0000:0000:0000:0000:0000:c0a8:0134 -- | 192.168.1.33 -- | Hostname: winxp-2b2955502 -- | Mac: 08:00:27:79:fd:d2 (Cadmus Computer Systems) -- | 192.168.1.22 -- | Hostname: core -- | Mac: 08:00:27:57:30:7f (Cadmus Computer Systems) -- |_ Use the newtargets script-arg to add the results as targets -- author = "Gorjan Petrovski, Hani Benhabiles" license = "Same as Nmap--See http://nmap.org/book/man-legal.html" categories = {"broadcast","discovery","safe"} prerule = function() if not nmap.is_privileged() then nmap.registry[SCRIPT_NAME] = nmap.registry[SCRIPT_NAME] or {} if not nmap.registry[SCRIPT_NAME].rootfail then stdnse.print_verbose("%s not running for lack of privileges.", SCRIPT_NAME) end nmap.registry[SCRIPT_NAME].rootfail = true return nil end if nmap.address_family() ~= 'inet' then stdnse.print_debug("%s is IPv4 compatible only.", SCRIPT_NAME) return false end return true end --- Converts a 6 byte string into the familiar MAC address formatting -- @param mac string containing the MAC address -- @return formatted string suitable for printing local function get_mac_addr( mac ) local catch = function() return end local try = nmap.new_try(catch) local mac_prefixes = try(datafiles.parse_mac_prefixes()) if mac:len() ~= 6 then return "Unknown" else local prefix = string.upper(string.format("%02x%02x%02x", mac:byte(1), mac:byte(2), mac:byte(3))) local manuf = mac_prefixes[prefix] or "Unknown" return string.format("%02x:%02x:%02x:%02x:%02x:%02x (%s)", mac:byte(1), mac:byte(2), mac:byte(3), mac:byte(4), mac:byte(5), mac:byte(6), manuf ) end end --- Gets a raw ethernet buffer with LLTD information and returns the responding host's IP and MAC local parseHello = function(data) -- HelloMsg = [ -- ethernet_hdr = [mac_dst(6), mac_src(6), protocol(2)], -- lltd_demultiplex_hdr = [version(1), type_of_service(1), reserved(1), function(1)], -- base_hdr = [mac_dst(6), mac_src(6), seq_no(2)], -- up_hello_hdr = [ generation_number(2), current_mapper_address(6), apparent_mapper_address(6), tlv_list(var) ] --] --HelloStruct = { -- mac_src, -- sequence_number, -- generation_number, -- tlv_list(dict) --} local types = {"Host ID", "Characteristics", "Physical Medium", "Wireless Mode", "802.11 BSSID", "802.11 SSID", "IPv4 Address", "IPv6 Address", "802.11 Max Operational Rate", "Performance Counter Frequency", nil, "Link Speed", "802.11 RSSI", "Icon Image", "Machine Name", "Support Information", "Friendly Name", "Device UUID", "Hardware ID", "QoS Characteristics", "802.11 Physical Medium", "AP Association Table", "Detailed Icon Image", "Sees-List Working Set", "Component Table", "Repeater AP Lineage", "Repeater AP Table"} local mac = nil local ipv4 = nil local ipv6 = nil local hostname = nil local pos = 1 pos = pos + 6 local mac_src = data:sub(pos,pos+5) pos = pos + 24 local seq_no = data:sub(pos,pos+1) pos = pos + 2 local generation_no = data:sub(pos,pos+1) pos = pos + 14 local tlv = data:sub(pos) local tlv_list = {} local p = 1 while p < #tlv do local t = tlv:byte(p) if t == 0x00 then break else p = p + 1 local l = tlv:byte(p) p = p + 1 local v = tlv:sub(p,p+l) if t == 0x01 then -- Host ID (MAC Address) mac = get_mac_addr(v:sub(1,6)) elseif t == 0x08 then ipv6 = string.format( "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x", v:byte(1), v:byte(2), v:byte(3), v:byte(4), v:byte(5), v:byte(6), v:byte(7), v:byte(8), v:byte(9), v:byte(10), v:byte(11), v:byte(12), v:byte(13), v:byte(14), v:byte(15), v:byte(16)) elseif t == 0x07 then -- IPv4 address ipv4 = string.format("%d.%d.%d.%d",v:byte(1),v:byte(2),v:byte(3),v:byte(4)), mac -- Machine Name (Hostname) elseif t == 0x0f then hostname = '' -- Hostname is returned in unicode, but Lua doesn't support that, -- so we skip 00 values. for i=1, #v-1, 2 do hostname = hostname .. string.char(v:byte(i)) end end p = p + l if ipv4 and ipv6 and mac and hostname then break end end end return ipv4, mac, ipv6, hostname end --- Creates an LLTD Quick Discovery packet with the source MAC address -- @param mac_src - six byte long binary string local QuickDiscoveryPacket = function(mac_src) local ethernet_hdr, demultiplex_hdr, base_hdr, discover_up_lev_hdr -- set up ethernet header = [ mac_dst, mac_src, protocol ] local mac_dst = "FF FF FF FF FF FF" -- broadcast local protocol = "88 d9" -- LLTD protocol number ethernet_hdr = bin.pack("HAH",mac_dst, mac_src, protocol) -- set up LLTD demultiplex header = [ version, type_of_service, reserved, function ] local lltd_version = "01" -- Fixed Value local lltd_type_of_service = "01" -- Type Of Service = Quick Discovery(0x01) local lltd_reserved = "00" -- Fixed value local lltd_function = "00" -- Function = QuickDiscovery->Discover (0x00) demultiplex_hdr = bin.pack("HHHH", lltd_version, lltd_type_of_service, lltd_reserved, lltd_function ) -- set up LLTD base header = [ mac_dst, mac_src, seq_num(xid) ] local lltd_seq_num = openssl.rand_bytes(2) base_hdr = bin.pack("HHA", mac_dst, mac_src, lltd_seq_num) -- set up LLTD Upper Level Header = [ generation_number, number_of_stations, station_list ] local generation_number = openssl.rand_bytes(2) local number_of_stations = "00 00" local station_list = "00 00 00 00 00 00 " .. "00 00 00 00 00 00 " .. "00 00 00 00 00 00 " .."00 00 00 00 00 00 " discover_up_lev_hdr = bin.pack("AHH", generation_number, number_of_stations, station_list) -- put them all together and return return bin.pack("AAAA", ethernet_hdr, demultiplex_hdr, base_hdr, discover_up_lev_hdr) end --- Runs a thread which discovers LLTD Responders on a certain interface local LLTDDiscover = function(if_table, lltd_responders, timeout) local timeout_s = 3 local condvar = nmap.condvar(lltd_responders) local pcap = nmap.new_socket() pcap:set_timeout(5000) local dnet = nmap.new_dnet() local try = nmap.new_try(function() dnet:ethernet_close() pcap:close() end) pcap:pcap_open(if_table.device, 256, false, "") try(dnet:ethernet_open(if_table.device)) local packet = QuickDiscoveryPacket(if_table.mac) try( dnet:ethernet_send(packet) ) stdnse.sleep(0.5) try( dnet:ethernet_send(packet) ) local start = os.time() local start_s = os.time() while true do local status, plen, l2, l3, _ = pcap:pcap_receive() if status then local packet = l2..l3 if stdnse.tohex(packet:sub(13,14)) == "88d9" then start_s = os.time() local ipv4, mac, ipv6, hostname = parseHello(packet) if ipv4 then if not lltd_responders[ipv4] then lltd_responders[ipv4] = {} lltd_responders[ipv4].hostname = hostname lltd_responders[ipv4].mac = mac lltd_responders[ipv4].ipv6 = ipv6 end end else if os.time() - start_s > timeout_s then break end end else break end if os.time() - start > timeout then break end end dnet:ethernet_close() pcap:close() condvar("signal") end action = function() local timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME..".timeout")) timeout = timeout or 30 --get interface script-args, if any local interface_arg = stdnse.get_script_args(SCRIPT_NAME .. ".interface") local interface_opt = nmap.get_interface() -- interfaces list (decide which interfaces to broadcast on) local interfaces ={} if interface_opt or interface_arg then -- single interface defined local interface = interface_opt or interface_arg local if_table = nmap.get_interface_info(interface) if not if_table or not if_table.address or not if_table.link=="ethernet" then stdnse.print_debug("Interface not supported or not properly configured.") return false end table.insert(interfaces, if_table) else local tmp_ifaces = nmap.list_interfaces() for _, if_table in ipairs(tmp_ifaces) do if if_table.address and if_table.link=="ethernet" and if_table.address:match("%d+%.%d+%.%d+%.%d+") then table.insert(interfaces, if_table) end end end if #interfaces == 0 then stdnse.print_debug("No interfaces found.") return end local lltd_responders={} local threads ={} local condvar = nmap.condvar(lltd_responders) -- party time for _, if_table in ipairs(interfaces) do -- create a thread for each interface local co = stdnse.new_thread(LLTDDiscover, if_table, lltd_responders, timeout) threads[co]=true end repeat for thread in pairs(threads) do if coroutine.status(thread) == "dead" then threads[thread] = nil end end if ( next(threads) ) then condvar "wait" end until next(threads) == nil -- generate output local output = {} for ip_addr, info in pairs(lltd_responders) do if target.ALLOW_NEW_TARGETS then target.add(ip_addr) end local s = {} s.name = ip_addr if info.hostname then table.insert(s, "Hostname: " .. info.hostname) end if info.mac then table.insert(s, "Mac: " .. info.mac) end if info.ipv6 then table.insert(s, "IPv6: " .. info.ipv6) end table.insert(output,s) end if #output>0 and not target.ALLOW_NEW_TARGETS then table.insert(output,"Use the newtargets script-arg to add the results as targets") end return stdnse.format_output( (#output>0), output ) end