Class: Bnet::Authenticator

Inherits:
Object
  • Object
show all
Includes:
AuthenticatorHelper
Defined in:
lib/bnet/authenticator.rb

Overview

The Battle.net authenticator

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(serial, secret) ⇒ Authenticator

Create a new authenticator with given serial and secret

Parameters:

  • serial (String)
  • secret (String)

Raises:

  • (BadInputError) 


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# File 'lib/bnet/authenticator.rb', line 36

def initialize(serial, secret)
  raise BadInputError.new("bad serial #{serial}") unless self.class.is_valid_serial?(serial)
  raise BadInputError.new("bad secret #{secret}") unless self.class.is_valid_secret?(secret)

  @normalized_serial = self.class.normalize_serial(serial)
  @secret = secret
end

Instance Attribute Details

#region ⇒ Symbol (readonly)

Returns region.

Returns:

  • (Symbol) —

    region



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# File 'lib/bnet/authenticator.rb', line 29

def region
  self.class.extract_region(@normalized_serial)
end

#restorecode ⇒ String (readonly)

Returns restoration code.

Returns:

  • (String) —

    restoration code



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# File 'lib/bnet/authenticator.rb', line 22

def restorecode
  restorecode_bin = Digest::SHA1.digest(@normalized_serial + secret.as_hex_to_bin)
  self.class.encode_restorecode(restorecode_bin.split(//).last(10).join)
end

#secret ⇒ String (readonly)

Returns hexified secret.

Returns:

  • (String) —

    hexified secret



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# File 'lib/bnet/authenticator.rb', line 18

def secret
  @secret
end

#serial ⇒ String (readonly)

Returns serial.

Returns:

  • (String) —

    serial



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# File 'lib/bnet/authenticator.rb', line 12

def serial
  self.class.prettify_serial(@normalized_serial)
end

Class Method Details

.get_token(secret, timestamp = nil) ⇒ String, Integer

Get token from given secret and timestamp

Parameters:

  • secret (String) —

    hexified secret

  • timestamp (Integer) (defaults to: nil) —

    UNIX timestamp in seconds, defaults to current time

Returns:

  • (String, Integer) —

    token and the next timestamp token to change

Raises:

  • (BadInputError) 


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# File 'lib/bnet/authenticator.rb', line 105

def self.get_token(secret, timestamp = nil)
  raise BadInputError.new("bad seret #{secret}") unless is_valid_secret?(secret)

  current = (timestamp || Time.now.getutc.to_i) / 30
  digest = Digest::HMAC.digest([current].pack('Q>'), secret.as_hex_to_bin, Digest::SHA1)
  start_position = digest[19].ord & 0xf

  token = digest[start_position, 4].unpack('L>')[0] & 0x7fffffff

  return '%08d' % (token % 100000000), (current + 1) * 30
end

.request_authenticator(region) ⇒ Bnet::Authenticator

Request a new authenticator from server

Parameters:

  • region (Symbol)

Returns:

Raises:

  • (BadInputError) 


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# File 'lib/bnet/authenticator.rb', line 47

def self.request_authenticator(region)
  raise BadInputError.new("bad region #{region}") unless is_valid_region?(region)

  k = create_one_time_pad(37)

  payload_plain = "\1" + k + region.to_s + CLIENT_MODEL.ljust(16, "\0")[0, 16]
  e = rsa_encrypt_bin(payload_plain)

  response_body = request_for('new serial', region, ENROLLMENT_REQUEST_PATH, e)

  decrypted = decrypt_response(response_body[8, 37], k)

  Authenticator.new(decrypted[20, 17], decrypted[0, 20].as_bin_to_hex)
end

.request_server_time(region) ⇒ Integer

Get server’s time

Parameters:

  • region (Symbol)

Returns:

  • (Integer) —

    server timestamp in seconds

Raises:

  • (BadInputError) 


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# File 'lib/bnet/authenticator.rb', line 93

def self.request_server_time(region)
  raise BadInputError.new("bad region #{region}") unless is_valid_region?(region)

  server_time_big_endian = request_for('server time', region, TIME_REQUEST_PATH)
  server_time_big_endian.unpack('Q>')[0].to_f / 1000
end

.restore_authenticator(serial, restorecode) ⇒ Bnet::Authenticator

Restore an authenticator from server

Parameters:

  • serial (String)
  • restorecode (String)

Returns:

Raises:

  • (BadInputError) 


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# File 'lib/bnet/authenticator.rb', line 66

def self.restore_authenticator(serial, restorecode)
  raise BadInputError.new("bad serial #{serial}") unless is_valid_serial?(serial)
  raise BadInputError.new("bad restoration code #{restorecode}") unless is_valid_restorecode?(restorecode)

  normalized_serial = normalize_serial(serial)
  region = extract_region(normalized_serial)

  # stage 1
  challenge = request_for('restore (stage 1)', region, RESTORE_INIT_REQUEST_PATH, normalized_serial)

  # stage 2
  key = create_one_time_pad(20)

  digest = Digest::HMAC.digest(normalized_serial + challenge,
                               decode_restorecode(restorecode),
                               Digest::SHA1)

  payload = normalized_serial + rsa_encrypt_bin(digest + key)

  response_body = request_for('restore (stage 2)', region, RESTORE_VALIDATE_REQUEST_PATH, payload)

  Authenticator.new(prettify_serial(normalized_serial), decrypt_response(response_body, key).as_bin_to_hex)
end

Instance Method Details

#get_token(timestamp = nil) ⇒ String, Integer

Get authenticator’s token from given timestamp

Parameters:

  • timestamp (Integer) (defaults to: nil) —

    UNIX timestamp in seconds, defaults to current time

Returns:

  • (String, Integer) —

    token and the next timestamp token to change



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# File 'lib/bnet/authenticator.rb', line 121

def get_token(timestamp = nil)
  self.class.get_token(@secret, timestamp)
end

#to_hash ⇒ Hash

Hash representation of this authenticator

Returns:

  • (Hash) 


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# File 'lib/bnet/authenticator.rb', line 127

def to_hash
  {
    :serial => serial,
    :secret => secret,
    :restorecode => restorecode,
    :region => region,
  }
end

#to_s ⇒ String

String representation of this authenticator

Returns:

  • (String) 


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# File 'lib/bnet/authenticator.rb', line 138

def to_s
  to_hash.to_s
end