libcryfs/test/cryfs/config/CryConfigFileTest.cpp

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#include <gtest/gtest.h>
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#include <cryfs/config/CryConfigFile.h>
#include <cpp-utils/tempfile/TempFile.h>
#include <boost/optional/optional_io.hpp>
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using namespace cryfs;
using cpputils::TempFile;
using std::string;
using boost::optional;
using boost::none;
using cpputils::SCrypt;
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using cpputils::Data;
namespace bf = boost::filesystem;
//gtest/boost::optional workaround for working with optional<CryConfigFile>
namespace boost {
inline std::ostream &operator<<(std::ostream &out, const CryConfigFile &file) {
UNUSED(file);
out << "ConfigFile";
return out;
}
}
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class CryConfigFileTest: public ::testing::Test {
public:
CryConfigFileTest(): file(false) {}
TempFile file;
CryConfig Config() {
CryConfig result;
result.SetCipher("aes-256-gcm");
return result;
}
CryConfigFile CreateAndLoadEmpty(const string &password = "mypassword") {
Create(Config(), password);
return Load().value();
}
void Create(CryConfig cfg, const string &password = "mypassword") {
CryConfigFile::create(file.path(), std::move(cfg), password, SCrypt::TestSettings);
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}
optional<CryConfigFile> Load(const string &password = "mypassword") {
return CryConfigFile::load(file.path(), password);
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}
void CreateWithCipher(const string &cipher) {
return CreateWithCipher(cipher, file);
}
void CreateWithCipher(const string &cipher, const TempFile &tempFile) {
CryConfig cfg;
cfg.SetCipher(cipher);
CryConfigFile::create(tempFile.path(), std::move(cfg), "mypassword", SCrypt::TestSettings);
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}
};
TEST_F(CryConfigFileTest, DoesntLoadIfWrongPassword) {
Create(Config(), "mypassword");
auto loaded = Load("mypassword2");
EXPECT_EQ(none, loaded);
}
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TEST_F(CryConfigFileTest, RootBlob_Init) {
CryConfigFile created = CreateAndLoadEmpty();
EXPECT_EQ("", created.config()->RootBlob());
}
TEST_F(CryConfigFileTest, RootBlob_CreateAndLoad) {
CryConfig cfg = Config();
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cfg.SetRootBlob("rootblobid");
Create(std::move(cfg));
CryConfigFile loaded = Load().value();
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EXPECT_EQ("rootblobid", loaded.config()->RootBlob());
}
TEST_F(CryConfigFileTest, RootBlob_SaveAndLoad) {
CryConfigFile created = CreateAndLoadEmpty();
created.config()->SetRootBlob("rootblobid");
created.save();
CryConfigFile loaded = Load().value();
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EXPECT_EQ("rootblobid", loaded.config()->RootBlob());
}
TEST_F(CryConfigFileTest, EncryptionKey_Init) {
CryConfigFile created = CreateAndLoadEmpty();
EXPECT_EQ("", created.config()->EncryptionKey());
}
TEST_F(CryConfigFileTest, EncryptionKey_CreateAndLoad) {
CryConfig cfg = Config();
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cfg.SetEncryptionKey("encryptionkey");
Create(std::move(cfg));
CryConfigFile loaded = Load().value();
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EXPECT_EQ("encryptionkey", loaded.config()->EncryptionKey());
}
TEST_F(CryConfigFileTest, EncryptionKey_SaveAndLoad) {
CryConfigFile created = CreateAndLoadEmpty();
created.config()->SetEncryptionKey("encryptionkey");
created.save();
CryConfigFile loaded = Load().value();
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EXPECT_EQ("encryptionkey", loaded.config()->EncryptionKey());
}
TEST_F(CryConfigFileTest, Cipher_Init) {
CryConfigFile created = CreateAndLoadEmpty();
EXPECT_EQ("aes-256-gcm", created.config()->Cipher());
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}
TEST_F(CryConfigFileTest, Cipher_CreateAndLoad) {
CryConfig cfg = Config();
cfg.SetCipher("twofish-128-cfb");
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Create(std::move(cfg));
CryConfigFile loaded = Load().value();
EXPECT_EQ("twofish-128-cfb", loaded.config()->Cipher());
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}
TEST_F(CryConfigFileTest, Cipher_SaveAndLoad) {
CryConfigFile created = CreateAndLoadEmpty();
created.config()->SetCipher("twofish-128-cfb");
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created.save();
CryConfigFile loaded = Load().value();
EXPECT_EQ("twofish-128-cfb", loaded.config()->Cipher());
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}
//Test that the encrypted config file has the same size, no matter how big the plaintext config data.
TEST_F(CryConfigFileTest, ConfigFileHasFixedSize) {
TempFile file1(false);
TempFile file2(false);
//It is important to have different cipher name lengths here, because they're on the outer encryption level.
//So this ensures that there also is a padding happening on the outer encryption level.
CreateWithCipher("aes-128-gcm", file1); // Short cipher name and short key
CreateWithCipher("twofish-256-cfb", file2); // Long cipher name and long key
EXPECT_EQ(bf::file_size(file1.path()), bf::file_size(file2.path()));
}
TEST_F(CryConfigFileTest, CanSaveAndLoadModififedCipher) {
CreateWithCipher("aes-256-gcm");
CryConfigFile created = Load().value();
EXPECT_EQ("aes-256-gcm", created.config()->Cipher());
created.config()->SetCipher("twofish-128-cfb");
created.save();
CryConfigFile loaded = Load().value();
EXPECT_EQ("twofish-128-cfb", loaded.config()->Cipher());
}
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TEST_F(CryConfigFileTest, FailsIfConfigFileIsEncryptedWithACipherDifferentToTheOneSpecifiedByTheUser) {
auto encryptor = CryConfigEncryptorFactory::deriveKey("mypassword", SCrypt::TestSettings);
auto config = Config();
config.SetCipher("aes-256-gcm");
Data encrypted = encryptor->encrypt(config.save(), "aes-256-cfb");
encrypted.StoreToFile(file.path());
auto loaded = Load("mypassword");
EXPECT_EQ(none, loaded);
}