80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
#include "CryConfigFile.h"
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#include <fstream>
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#include <boost/filesystem.hpp>
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#include <sstream>
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#include <cpp-utils/logging/logging.h>
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using boost::optional;
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using boost::none;
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using std::ifstream;
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using std::ofstream;
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using std::string;
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using std::istringstream;
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using std::ostringstream;
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using std::stringstream;
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using std::istream;
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using cpputils::Data;
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using cpputils::unique_ref;
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using cpputils::SCryptSettings;
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namespace bf = boost::filesystem;
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using namespace cpputils::logging;
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namespace cryfs {
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CryConfigFile::~CryConfigFile() {
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//We do not call save() here, because we do not want the config file to be re-encrypted on each filesystem run
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}
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optional<CryConfigFile> CryConfigFile::load(const bf::path &path, const string &password) {
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auto encryptedConfigData = Data::LoadFromFile(path);
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if (encryptedConfigData == none) {
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LOG(ERROR, "Config file not found");
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return none;
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}
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auto encryptor = CryConfigEncryptorFactory::loadKey(*encryptedConfigData, password);
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if (encryptor == none) {
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return none;
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}
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auto decrypted = (*encryptor)->decrypt(*encryptedConfigData);
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if (decrypted == none) {
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return none;
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}
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CryConfig config = CryConfig::load(decrypted->data);
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if (config.Cipher() != decrypted->cipherName) {
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LOG(ERROR, "Inner cipher algorithm used to encrypt config file doesn't match config value");
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return none;
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}
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auto configFile = CryConfigFile(path, std::move(config), std::move(*encryptor));
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if (decrypted->wasInDeprecatedConfigFormat) {
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// Migrate it to new format
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configFile.save();
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}
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//TODO For newer compilers, this works without std::move
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return std::move(configFile);
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}
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CryConfigFile CryConfigFile::create(const bf::path &path, const CryConfig &config, const string &password, const SCryptSettings &scryptSettings) {
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if (bf::exists(path)) {
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throw std::runtime_error("Config file exists already.");
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}
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auto result = CryConfigFile(path, config, CryConfigEncryptorFactory::deriveKey(password, scryptSettings));
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result.save();
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return result;
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}
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CryConfigFile::CryConfigFile(const bf::path &path, const CryConfig &config, unique_ref<CryConfigEncryptor> encryptor)
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: _path (path), _config(config), _encryptor(std::move(encryptor)) {
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}
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void CryConfigFile::save() const {
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Data configData = _config.save();
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auto encrypted = _encryptor->encrypt(configData, _config.Cipher());
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encrypted.StoreToFile(_path);
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}
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CryConfig *CryConfigFile::config() {
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return &_config;
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}
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}
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