/usr/lib/ruby/vendor_ruby/active_support/message_encryptor.rb is in ruby-activesupport-3.2 3.2.16-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | require 'openssl'
require 'active_support/base64'
module ActiveSupport
# MessageEncryptor is a simple way to encrypt values which get stored somewhere
# you don't trust.
#
# The cipher text and initialization vector are base64 encoded and returned to you.
#
# 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, 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 = 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
cipher.encrypt
cipher.key = @secret
cipher.iv = iv
encrypted_data = cipher.update(@serializer.dump(value))
encrypted_data << cipher.final
[encrypted_data, iv].map {|v| ::Base64.strict_encode64(v)}.join("--")
end
def _decrypt(encrypted_message)
cipher = new_cipher
encrypted_data, iv = encrypted_message.split("--").map {|v| ::Base64.decode64(v)}
cipher.decrypt
cipher.key = @secret
cipher.iv = iv
decrypted_data = cipher.update(encrypted_data)
decrypted_data << cipher.final
@serializer.load(decrypted_data)
rescue OpenSSLCipherError, TypeError
raise InvalidMessage
end
def new_cipher
OpenSSL::Cipher::Cipher.new(@cipher)
end
def verifier
@verifier
end
end
end
|