diff options
Diffstat (limited to 'activesupport/lib/active_support/message_encryptor.rb')
-rw-r--r-- | activesupport/lib/active_support/message_encryptor.rb | 72 |
1 files changed, 52 insertions, 20 deletions
diff --git a/activesupport/lib/active_support/message_encryptor.rb b/activesupport/lib/active_support/message_encryptor.rb index 4f7cd12d48..9ef2b29580 100644 --- a/activesupport/lib/active_support/message_encryptor.rb +++ b/activesupport/lib/active_support/message_encryptor.rb @@ -10,15 +10,58 @@ module ActiveSupport # This can be used in situations similar to the <tt>MessageVerifier</tt>, but where you don't # want users to be able to determine the value of the payload. class MessageEncryptor + module NullSerializer #:nodoc: + def self.load(value) + value + end + + def self.dump(value) + value + end + end + class InvalidMessage < StandardError; end OpenSSLCipherError = OpenSSL::Cipher.const_defined?(:CipherError) ? OpenSSL::Cipher::CipherError : OpenSSL::CipherError - def initialize(secret, cipher = 'aes-256-cbc') + def initialize(secret, options = {}) + unless options.is_a?(Hash) + ActiveSupport::Deprecation.warn "The second parameter should be an options hash. Use :cipher => 'algorithm' to specify the cipher algorithm." + options = { :cipher => options } + end + @secret = secret - @cipher = cipher + @cipher = options[:cipher] || 'aes-256-cbc' + @verifier = MessageVerifier.new(@secret, :serializer => NullSerializer) + @serializer = options[:serializer] || Marshal end def encrypt(value) + ActiveSupport::Deprecation.warn "MessageEncryptor#encrypt is deprecated as it is not safe without a signature. " \ + "Please use MessageEncryptor#encrypt_and_sign instead." + _encrypt(value) + end + + def decrypt(value) + ActiveSupport::Deprecation.warn "MessageEncryptor#decrypt is deprecated as it is not safe without a signature. " \ + "Please use MessageEncryptor#decrypt_and_verify instead." + _decrypt(value) + end + + # Encrypt and sign a message. We need to sign the message in order to avoid padding attacks. + # Reference: http://www.limited-entropy.com/padding-oracle-attacks + def encrypt_and_sign(value) + verifier.generate(_encrypt(value)) + end + + # Decrypt and verify a message. We need to verify the message in order to avoid padding attacks. + # Reference: http://www.limited-entropy.com/padding-oracle-attacks + def decrypt_and_verify(value) + _decrypt(verifier.verify(value)) + end + + private + + def _encrypt(value) cipher = new_cipher # Rely on OpenSSL for the initialization vector iv = cipher.random_iv @@ -27,13 +70,13 @@ module ActiveSupport cipher.key = @secret cipher.iv = iv - encrypted_data = cipher.update(Marshal.dump(value)) + encrypted_data = cipher.update(@serializer.dump(value)) encrypted_data << cipher.final [encrypted_data, iv].map {|v| ActiveSupport::Base64.encode64s(v)}.join("--") end - def decrypt(encrypted_message) + def _decrypt(encrypted_message) cipher = new_cipher encrypted_data, iv = encrypted_message.split("--").map {|v| ActiveSupport::Base64.decode64(v)} @@ -44,28 +87,17 @@ module ActiveSupport decrypted_data = cipher.update(encrypted_data) decrypted_data << cipher.final - Marshal.load(decrypted_data) + @serializer.load(decrypted_data) rescue OpenSSLCipherError, TypeError raise InvalidMessage end - def encrypt_and_sign(value) - verifier.generate(encrypt(value)) + def new_cipher + OpenSSL::Cipher::Cipher.new(@cipher) end - def decrypt_and_verify(value) - decrypt(verifier.verify(value)) + def verifier + @verifier end - - - - private - def new_cipher - OpenSSL::Cipher::Cipher.new(@cipher) - end - - def verifier - MessageVerifier.new(@secret) - end end end |