mirror of
https://github.com/nmap/nmap.git
synced 2025-12-07 21:21:31 +00:00
b868e7f3ce
Scripts no longer need to implement caching of datafiles tables in the
registry, since the datafiles.lua library keeps its own cache in the
registry. A side-effect is that scripts should not change the tables
returned by datafiles.parse_{protocols,rpc,services,mac_prefixes}(), as
doing so will affect all other scripts that use those functions.
272 lines
8.0 KiB
Lua
272 lines
8.0 KiB
Lua
local bit = require "bit"
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local datafiles = require "datafiles"
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local nmap = require "nmap"
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local stdnse = require "stdnse"
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local string = require "string"
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description = [[
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Shows extra information about IPv6 addresses, such as embedded MAC or IPv4 addresses when available.
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Some IP address formats encode extra information; for example some IPv6
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addresses encode an IPv4 address or MAC address. This script can decode
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these address formats:
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* IPv4-compatible IPv6 addresses,
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* IPv4-mapped IPv6 addresses,
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* Teredo IPv6 addresses,
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* 6to4 IPv6 addresses,
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* IPv6 addresses using an EUI-64 interface ID,
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* IPv4-embedded IPv6 addresses,
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* IPv4-translated IPv6 addresses and
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* ISATAP Modified EUI-64 IPv6 addresses.
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See RFC 4291 for general IPv6 addressing architecture and the
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definitions of some terms.
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]]
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---
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-- @output
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-- Nmap scan report for ::1.2.3.4
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-- Host script results:
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-- |_address-info: IPv4-compatible; IPv4 address: 1.2.3.4
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--
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-- Nmap scan report for ::ffff:1.2.3.4
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-- Host script results:
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-- |_address-info: IPv4-mapped; IPv4 address: 1.2.3.4
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--
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-- Nmap scan report for 2001:0:506:708:282a:3d75:fefd:fcfb
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-- Host script results:
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-- | address-info: Teredo;
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-- | Server IPv4 address: 5.6.7.8
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-- | Client IPv4 address: 1.2.3.4
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-- |_ UDP port: 49802
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--
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-- Nmap scan report for 2002:102:304::1
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-- Host script results:
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-- |_address-info: 6to4; IPv4 address: 1.2.3.4
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--
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-- Nmap scan report for fe80::a8bb:ccff:fedd:eeff
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-- Host script results:
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-- |_address-info: IPv6 EUI-64; MAC address: aa:bb:cc:dd:ee:ff (Unknown)
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--
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-- Nmap scan report for 64:ff9b::c000:221
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-- Host script results:
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-- |_address-info: IPv4-embedded IPv6 address; IPv4 address: 192.0.2.33
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--
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-- Nmap scan report for ::ffff:0:c0a8:101
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-- Host script results:
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-- |_address-info: IPv4-translated IPv6 address; IPv4 address: 192.168.1.1
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--
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-- * ISATAP. RFC 5214.
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-- XXXX:XXXX:XXXX:XX00:0000:5EFE:a.b.c.d
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author = "David Fifield"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"default", "safe"}
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hostrule = function(host)
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return true
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end
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-- Match an address (array of bytes) against a hex-encoded pattern. "XX" in the
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-- pattern is a wildcard.
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local function matches(addr, pattern)
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local octet_patterns
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octet_patterns = {}
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for op in pattern:gmatch("([%xX][%xX])") do
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octet_patterns[#octet_patterns + 1] = op
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end
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if #addr ~= #octet_patterns then
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return false
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end
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for i = 1, #addr do
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local a, op
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a = addr[i]
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op = octet_patterns[i]
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if not (op == "XX" or a == tonumber(op, 16)) then
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return false
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end
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end
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return true
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end
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local function get_manuf(mac)
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local catch = function() return "Unknown" end
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local try = nmap.new_try(catch)
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local mac_prefixes = try(datafiles.parse_mac_prefixes())
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local prefix = string.upper(string.format("%02x%02x%02x", mac[1], mac[2], mac[3]))
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return mac_prefixes[prefix] or "Unknown"
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end
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local function format_mac(mac)
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local octets
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octets = {}
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for _, v in ipairs(mac) do
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octets[#octets + 1] = string.format("%02x", v)
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end
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return stdnse.strjoin(":", octets) .. " (" .. get_manuf(mac) .. ")"
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end
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local function format_ipv4(ipv4)
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local octets
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octets = {}
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for _, v in ipairs(ipv4) do
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octets[#octets + 1] = string.format("%d", v)
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end
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return stdnse.strjoin(".", octets)
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end
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local function do_ipv4(addr)
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end
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-- EUI-64 from MAC, RFC 4291.
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local function decode_eui_64(eui_64)
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if eui_64[4] == 0xff and eui_64[5] == 0xfe then
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return { bit.bxor(eui_64[1], 0x02),
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eui_64[2], eui_64[3], eui_64[6], eui_64[7], eui_64[8] }
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end
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end
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local function format_output(label, lines)
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local output
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output = ""
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if #lines == 0 then
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return label
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elseif #lines == 1 then
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if label then
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output = output .. label .. "; "
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end
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return output .. lines[1]
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else
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if label then
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output = output .. label .. ";"
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end
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return output .. "\n " .. stdnse.strjoin("\n ", lines)
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end
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end
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local function do_ipv6(addr)
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local label
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local output
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output = {}
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if matches(addr, "0000:0000:0000:0000:0000:0000:XXXX:XXXX")
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and not matches(addr, "0000:0000:0000:0000:0000:0000:0000:0001") then
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-- RFC 4291 2.5.5.1. Specifically exclude ::1 for localhost.
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local ipv4 = { addr[13], addr[14], addr[15], addr[16] }
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return format_output("IPv4-compatible",
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{ "IPv4 address: " .. format_ipv4(ipv4) })
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elseif matches(addr, "0000:0000:0000:0000:0000:ffff:XXXX:XXXX") then
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-- RFC 4291 2.5.5.2.
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local ipv4 = { addr[13], addr[14], addr[15], addr[16] }
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return format_output("IPv4-mapped",
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{ "IPv4 address: " .. format_ipv4(ipv4) })
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elseif matches(addr, "2001:0000:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX") then
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-- Teredo, RFC 4380.
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local server_ipv4 = { addr[5], addr[6], addr[7], addr[8] }
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-- RFC 5991 makes the flags mostly meaningless.
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local flags = addr[9] * 256 + addr[10]
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local obs_port = addr[11] * 256 + addr[12]
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local obs_client_ipv4 = { addr[13], addr[14], addr[15], addr[16] }
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local port, client_ipv4
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-- Invert obs_port.
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port = bit.bxor(obs_port, 0xffff)
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-- Invert obs_client_ipv4.
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client_ipv4 = {}
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for _, octet in ipairs(obs_client_ipv4) do
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client_ipv4[#client_ipv4 + 1] = bit.bxor(octet, 0xff)
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end
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output[#output + 1] = "Server IPv4 address: " .. format_ipv4(server_ipv4)
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output[#output + 1] = "Client IPv4 address: " .. format_ipv4(client_ipv4)
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output[#output + 1] = "UDP port: " .. tostring(port)
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return format_output("Teredo", output)
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elseif matches(addr, "0064:ff9b:XXXX:XXXX:00XX:XXXX:XXXX:XXXX") then
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--IPv4-embedded IPv6 addresses. RFC 6052, Section 2
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--skip addr[9]
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if matches(addr,"0064:ff9b:0000:0000:0000:0000:XXXX:XXXX") then
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local ipv4 = {addr[13], addr[14], addr[15], addr[16]}
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return format_output("IPv4-embedded IPv6 address",{"IPv4 address: "..format_ipv4(ipv4)})
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elseif addr[5] ~= 0x01 then
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local ipv4 = {addr[5], addr[6], addr[7], addr[8]}
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return format_output("IPv4-embedded IPv6 address",{"IPv4 address: "..format_ipv4(ipv4)})
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elseif addr[6] ~= 0x22 then
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local ipv4 = {addr[6], addr[7], addr[8], addr[10]}
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return format_output("IPv4-embedded IPv6 address",{"IPv4 address: "..format_ipv4(ipv4)})
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elseif addr[7] ~= 0x03 then
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local ipv4 = {addr[7], addr[8], addr[10], addr[11]}
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return format_output("IPv4-embedded IPv6 address",{"IPv4 address: "..format_ipv4(ipv4)})
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elseif addr[8] ~= 0x44 then
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local ipv4 = {addr[8], addr[10], addr[11], addr[12]}
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return format_output("IPv4-embedded IPv6 address",{"IPv4 address: "..format_ipv4(ipv4)})
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elseif addr[10] == 0x00 and addr[11] == 0x00 and addr[12] == 0x00 then
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local ipv4 = {addr[13], addr[14], addr[15], addr[16]}
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return format_output("IPv4-embedded IPv6 address",{"IPv4 address: "..format_ipv4(ipv4)})
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end
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elseif matches(addr, "0000:0000:0000:0000:ffff:0000:XXXX:XXXX") then
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-- IPv4-translated IPv6 addresses. RFC 2765, Section 2.1
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return format_output("IPv4-translated IPv6 address",
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{"IPv4 address: "..format_ipv4( {addr[13], addr[14], addr[15], addr[16]})})
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elseif matches(addr, "XXXX:XXXX:XXXX:XX00:0000:5efe:XXXX:XXXX") then
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-- ISATAP. RFC 5214, Appendix A
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-- XXXX:XXXX:XXXX:XX00:0000:5EFE:a.b.c.d
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return format_output("ISATAP Modified EUI-64 IPv6 Address",
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{"IPv4 address: "..format_ipv4( {addr[13], addr[14], addr[15], addr[16]})})
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end
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-- These following use common handling for the Interface ID part
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-- (last 64 bits).
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if matches(addr, "2002:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX") then
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-- 6to4, RFC 3056.
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local ipv4 = { addr[3], addr[4], addr[5], addr[6] }
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local mac = decode_eui_64({ addr[9], addr[10], addr[11], addr[12],
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addr[13], addr[14], addr[15], addr[16] })
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label = "6to4"
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output[#output + 1] = "IPv4 address: " .. format_ipv4(ipv4)
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end
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local mac = decode_eui_64({ addr[9], addr[10], addr[11], addr[12],
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addr[13], addr[14], addr[15], addr[16] })
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if mac then
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output[#output + 1] = "MAC address: " .. format_mac(mac)
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if not label then
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label = "IPv6 EUI-64"
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end
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end
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return format_output(label, output)
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end
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action = function(host)
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local addr_s, addr_t
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addr_s = host.bin_ip
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addr_t = { string.byte(addr_s, 1, #addr_s) }
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if #addr_t == 4 then
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return do_ipv4(addr_t)
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elseif #addr_t == 16 then
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return do_ipv6(addr_t)
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end
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end
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