require "abstract_unit" require "openssl" require "active_support/time" require "active_support/json" class MessageEncryptorTest < ActiveSupport::TestCase class JSONSerializer def dump(value) ActiveSupport::JSON.encode(value) end def load(value) ActiveSupport::JSON.decode(value) end end def setup @secret = SecureRandom.random_bytes(32) @verifier = ActiveSupport::MessageVerifier.new(@secret, serializer: ActiveSupport::MessageEncryptor::NullSerializer) @encryptor = ActiveSupport::MessageEncryptor.new(@secret) @data = { some: "data", now: Time.local(2010) } end def test_encrypting_twice_yields_differing_cipher_text first_message = @encryptor.encrypt_and_sign(@data).split("--").first second_message = @encryptor.encrypt_and_sign(@data).split("--").first assert_not_equal first_message, second_message end def test_messing_with_either_encrypted_values_causes_failure text, iv = @verifier.verify(@encryptor.encrypt_and_sign(@data)).split("--") assert_not_decrypted([iv, text] * "--") assert_not_decrypted([text, munge(iv)] * "--") assert_not_decrypted([munge(text), iv] * "--") assert_not_decrypted([munge(text), munge(iv)] * "--") end def test_messing_with_verified_values_causes_failures text, iv = @encryptor.encrypt_and_sign(@data).split("--") assert_not_verified([iv, text] * "--") assert_not_verified([text, munge(iv)] * "--") assert_not_verified([munge(text), iv] * "--") assert_not_verified([munge(text), munge(iv)] * "--") end def test_signed_round_tripping message = @encryptor.encrypt_and_sign(@data) assert_equal @data, @encryptor.decrypt_and_verify(message) end def test_alternative_serialization_method prev = ActiveSupport.use_standard_json_time_format ActiveSupport.use_standard_json_time_format = true encryptor = ActiveSupport::MessageEncryptor.new(SecureRandom.random_bytes(32), SecureRandom.random_bytes(128), serializer: JSONSerializer.new) message = encryptor.encrypt_and_sign(:foo => 123, "bar" => Time.utc(2010)) exp = { "foo" => 123, "bar" => "2010-01-01T00:00:00.000Z" } assert_equal exp, encryptor.decrypt_and_verify(message) ensure ActiveSupport.use_standard_json_time_format = prev end def test_message_obeys_strict_encoding bad_encoding_characters = "\n!@#" message, iv = @encryptor.encrypt_and_sign("This is a very \n\nhumble string"+bad_encoding_characters) assert_not_decrypted("#{::Base64.encode64 message.to_s}--#{::Base64.encode64 iv.to_s}") assert_not_verified("#{::Base64.encode64 message.to_s}--#{::Base64.encode64 iv.to_s}") assert_not_decrypted([iv, message] * bad_encoding_characters) assert_not_verified([iv, message] * bad_encoding_characters) end def test_aead_mode_encryption encryptor = ActiveSupport::MessageEncryptor.new(@secret, cipher: "aes-256-gcm") message = encryptor.encrypt_and_sign(@data) assert_equal @data, encryptor.decrypt_and_verify(message) end def test_messing_with_aead_values_causes_failures encryptor = ActiveSupport::MessageEncryptor.new(@secret, cipher: "aes-256-gcm") text, iv, auth_tag = encryptor.encrypt_and_sign(@data).split("--") assert_not_decrypted([iv, text, auth_tag] * "--") assert_not_decrypted([munge(text), iv, auth_tag] * "--") assert_not_decrypted([text, munge(iv), auth_tag] * "--") assert_not_decrypted([text, iv, munge(auth_tag)] * "--") assert_not_decrypted([munge(text), munge(iv), munge(auth_tag)] * "--") assert_not_decrypted([text, iv] * "--") assert_not_decrypted([text, iv, auth_tag[0..-2]] * "--") end private def assert_not_decrypted(value) assert_raise(ActiveSupport::MessageEncryptor::InvalidMessage) do @encryptor.decrypt_and_verify(@verifier.generate(value)) end end def assert_not_verified(value) assert_raise(ActiveSupport::MessageVerifier::InvalidSignature) do @encryptor.decrypt_and_verify(value) end end def munge(base64_string) bits = ::Base64.strict_decode64(base64_string) bits.reverse! ::Base64.strict_encode64(bits) end end