/// <summary>
/// Register new user and saves all data in json file
/// </summary>
/// <param name="user"></param>
/// <returns>0 - if registration went successful,
/// 1 - if some error occured,
/// 2 - if username is already used</returns>
public static int Register(User user)
{
string hashedUsername = DataCryptography.SHA512(user.GetUsername());
if (IsUsernameNotTaken(hashedUsername))
{
User userHashedData = new User(DataCryptography.SHA512(user.GetFirstName()),
DataCryptography.SHA512(user.GetLastName()),
hashedUsername,
DataCryptography.SHA512(user.GetPassword()),
DataCryptography.SHA512(user.GetBirthday()),
user.GetQuestion(),
DataCryptography.SHA512(user.GetAnswer().ToLower()),
DataCryptography.SHA512(DataCryptography.GenerateAesKey(user.GetUsername(),
user.GetPassword(),
user.GetQuestion(),
user.GetAnswer().ToLower())));
if (IOClass.SaveNewUser(userHashedData, user.GetUsername()))
{
return(0);
}
else
{
return(1);
}
}
return(2);
}
/// <summary>
/// Deletes file paths that are no longer protected
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void deleteFilesBtn_Click(object sender, RoutedEventArgs e)
{
string selectedItem = listBoxFiles.SelectedItem.ToString();
Files.Remove(selectedItem);
IOClass.SaveFilesList(Files, @"C:\temp\files.json");
listBoxFiles.ItemsSource = Files;
}
/// <summary>
/// Binds folder paths data to list boxes
/// </summary>
private void bindFoldersListBox()
{
Folders = IOClass.ReadFoldersList(this.UserFoldersFilepath);
if (Folders.Count > 0)
{
listBoxFolders.ItemsSource = Folders;
}
}
/// <summary>
/// Provides files recovery feature
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnRecoverFiles_Click(object sender, RoutedEventArgs e)
{
string securityAnswer = textBoxSecurityAnswer.Text.ToLower();
string password = textBoxRecoveryPassword.Password;
if (EncryptedFiles.Count.Equals(0))
{
MessageBox.Show("You have no files to recover.", "No encrypted files found", MessageBoxButton.OK, MessageBoxImage.Information);
}
else
{
if (DataCryptography.SHA512(securityAnswer).Equals(LoggedUser.GetAnswer()) && DataCryptography.SHA512(password).Equals(LoggedUser.GetPassword()))
{
MessageBoxResult result = MessageBox.Show("Do you want to recover your files? All your program settings and keys will be deleted.", "Files recovery system", MessageBoxButton.YesNo, MessageBoxImage.Question);
if (result.Equals(MessageBoxResult.Yes))
{
string aesKey = DataCryptography.SHA512(DataCryptography.GenerateAesKey(this.Username,
password,
LoggedUser.GetQuestion(),
securityAnswer));
List <string> tempEncryptedFiles = new List <string>(EncryptedFiles);
EncryptedFiles.Clear();
Files.Clear();
Folders.Clear();
TrustedDevices.Clear();
var decryptionTask = Task.Run(() =>
{
foreach (string encryptedFilePath in tempEncryptedFiles)
{
string filePath = DataCryptography.FileDecrypt(encryptedFilePath, aesKey);
}
});
decryptionTask.Wait();
LoggedUser.SetPublicKeyXmlString(String.Empty);
LoggedUser.SetAesKey(aesKey);
IOClass.SaveFilesList(Files, this.UserFilesFilepath);
IOClass.SaveFilesList(EncryptedFiles, this.UserEncryptedFilesFilepath);
IOClass.SaveFoldersList(Folders, this.UserFoldersFilepath);
IOClass.SaveTrustedDevicesList(TrustedDevices, this.UserKeyDataFilepath);
IOClass.UpdateUser(LoggedUser);
bindFilesListBox();
bindFoldersListBox();
MessageBox.Show("Your files are decrypted now.", "Files recovery system", MessageBoxButton.OK, MessageBoxImage.Information);
}
}
else
{
MessageBox.Show("Security answer or password incorrect!", "Files recovery system", MessageBoxButton.OK, MessageBoxImage.Warning);
}
}
}
/// <summary>
/// Deletes folder paths that are no longer protected
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void deleteFoldersBtn_Click(object sender, RoutedEventArgs e)
{
string selectedItem = listBoxFolders.SelectedItem.ToString();
ProcessDirectory(selectedItem, false);
IOClass.SaveFilesList(Files, this.UserFilesFilepath);
Folders.Remove(selectedItem);
IOClass.SaveFoldersList(Folders, this.UserFoldersFilepath);
listBoxFiles.ItemsSource = Files;
listBoxFolders.ItemsSource = Folders;
}
/// <summary>
/// Checks if passed username is already used by another user
/// </summary>
/// <param name="username">Users username passed from register form</param>
/// <returns>True - if username is not used,
/// False - if username is used</returns>
public static bool IsUsernameNotTaken(string username)
{
List <User> usersList = IOClass.ReadUsersList();
foreach (User user in usersList)
{
if (user.GetUsername().Equals(username))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Binds file paths data to list boxes
/// </summary>
private void bindFilesListBox()
{
Files = IOClass.ReadFilesList(UserFilesFilepath);
EncryptedFiles = IOClass.ReadFilesList(this.UserEncryptedFilesFilepath);
if (Files.Count > 0)
{
listBoxFiles.ItemsSource = Files;
}
else if (EncryptedFiles.Count >= 0)
{
listBoxFiles.ItemsSource = EncryptedFiles;
}
}
/// <summary>
/// Activates Ffle dialog and saves file paths that will be protected
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void addFilesBtn_Click(object sender, RoutedEventArgs e)
{
CommonOpenFileDialog fileDialog = new CommonOpenFileDialog
{
InitialDirectory = @"C:\",
Multiselect = true
};
if (fileDialog.ShowDialog() == CommonFileDialogResult.Ok)
{
Files = IOClass.ReadFilesList(this.UserFilesFilepath);
Files.AddRange(fileDialog.FileNames);
listBoxFiles.ItemsSource = Files;
IOClass.SaveFilesList(Files, this.UserFilesFilepath);
}
}
/// <summary>
/// Checks user's credentials and allows to log in
/// </summary>
/// <param name="login"></param>
/// <param name="password"></param>
/// <returns>True - if credentials were ok,
/// False - if credentials were wrong</returns>
public static bool Login(string login, string password)
{
List <User> usersList = IOClass.ReadUsersList();
string loginHash = DataCryptography.SHA512(login);
string passwordHash = DataCryptography.SHA512(password);
foreach (User user in usersList)
{
if (user.GetUsername().Equals(loginHash))
{
if (user.GetPassword().Equals(passwordHash))
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Creates an authentication key from selected device and saves it to the list.
/// Adds a private key to device and public key to user data.
/// </summary>
/// <param name="deviceData"></param>
/// <returns>Returns true if procedure went well</returns>
bool addTrustedDevice(string deviceData)
{
// Temporary limit of trusted devices due to lack of multi-private-key system
if (TrustedDevices.Count.Equals(0))
{
string[] deviceDataArray = deviceData.Split(':');
string deviceModel = deviceDataArray[0].Trim();
string deviceName = deviceDataArray[1].Trim();
foreach (var device in ConnectedDevices)
{
if (device.VolumeName.Equals(deviceName) && device.Model.Equals(deviceModel))
{
TrustedDevices.Add(device);
string publicKeyString, privateKeyString;
(publicKeyString, privateKeyString) = DataCryptography.GenerateRsaKeys();
string aesKey = LoggedUser.GetAesKey();
string encryptedAesKey = DataCryptography.EncryptAESKey(aesKey, publicKeyString);
if (IOClass.SaveTrustedDevicesList(TrustedDevices, this.UserKeyDataFilepath) &&
IOClass.SavePrivateKeyOnDevice(device.Path, privateKeyString))
{
LoggedUser.SetPublicKeyXmlString(publicKeyString);
LoggedUser.SetAesKey(encryptedAesKey);
LoggedUser.SetKeysQuantity(LoggedUser.GetKeysQuantity() + 1);
IOClass.UpdateUser(LoggedUser);
break;
}
else
{
MessageBox.Show("Couldn't create an authentication key.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
}
return(true);
}
else
{
MessageBox.Show("You already have your trusted device. Couldn't create another one.", "Information", MessageBoxButton.OK, MessageBoxImage.Information);
return(false);
}
}
/// <summary>
/// Deletes a device from trusted devices list
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void deleteTrustedDeviceBtn_Click(object sender, RoutedEventArgs e)
{
MessageBoxResult result1 = MessageBox.Show("Do you want to delete " + listBoxTrustedDevices.SelectedItem.ToString() + "?", "Delete an authentication key?", MessageBoxButton.YesNo, MessageBoxImage.Question);
if (result1.Equals(MessageBoxResult.Yes))
{
if (Files.Count > 0)
{
MessageBoxResult result2 = MessageBox.Show("You want to delete a key with associated files with it. " +
"They will no longer be protected! Are you sure?", "Associated files found!", MessageBoxButton.YesNo, MessageBoxImage.Warning);
if (result2.Equals(MessageBoxResult.Yes))
{
Files.Clear();
IOClass.SaveFilesList(Files, this.UserFilesFilepath);
bindFilesListBox();
bindDeviceListBoxes();
if (deleteTrustedDevice(listBoxTrustedDevices.SelectedItem.ToString()))
{
MessageBox.Show("The authentication key has been deleted.", "Deleting successful", MessageBoxButton.OK, MessageBoxImage.Information);
}
else
{
MessageBox.Show("Couldn't delete an authentication key.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
}
else
{
if (deleteTrustedDevice(listBoxTrustedDevices.SelectedItem.ToString()))
{
MessageBox.Show("The authentication key has been deleted.", "Deleting successful", MessageBoxButton.OK, MessageBoxImage.Information);
}
else
{
MessageBox.Show("Couldn't delete an authentication key.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
}
}
/// <summary>
/// Deletes an authentication key from the list
/// </summary>
/// <param name="deviceData"></param>
/// <returns></returns>
bool deleteTrustedDevice(string deviceData)
{
string[] deviceDataArray = deviceData.Split(':');
string deviceModel = deviceDataArray[0].Trim();
string deviceName = deviceDataArray[1].Trim();
foreach (var device in TrustedDevices)
{
if (device.VolumeName.Equals(deviceName) && device.Model.Equals(deviceModel))
{
TrustedDevices.Remove(device);
if (IOClass.RemovePrivateKeyFromDevice(device.Path) &&
IOClass.SaveTrustedDevicesList(TrustedDevices, this.UserKeyDataFilepath))
{
LoggedUser.SetPublicKeyXmlString(null);
LoggedUser.SetAesKey(String.Empty);
LoggedUser.SetKeysQuantity(LoggedUser.GetKeysQuantity() - 1);
IOClass.UpdateUser(LoggedUser);
return(true);
}
}
}
return(false);
}
/// <summary>
/// Activates File Dialog and saves folder paths that will be protected
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void addFoldersBtn_Click(object sender, RoutedEventArgs e)
{
CommonOpenFileDialog folderDialog = new CommonOpenFileDialog
{
InitialDirectory = @"C:\",
IsFolderPicker = true
};
if (folderDialog.ShowDialog() == CommonFileDialogResult.Ok)
{
Folders = IOClass.ReadFoldersList(this.UserFoldersFilepath);
Folders.AddRange(folderDialog.FileNames);
foreach (string folderPath in folderDialog.FileNames)
{
ProcessDirectory(folderPath, true);
}
IOClass.SaveFilesList(Files, this.UserFilesFilepath);
listBoxFolders.ItemsSource = Folders;
listBoxFiles.ItemsSource = Files;
IOClass.SaveFoldersList(Folders, this.UserFoldersFilepath);
}
}
public logonScreen()
{
InitializeComponent();
IOClass.CreateRootDirectory();
}
/// <summary>
/// Updates all data about devices and sets authorization status
/// </summary>
private void UpdateDevicesStatus()
{
TrustedDevices = IOClass.ReadTrustedDevicesList(this.UserKeyDataFilepath);
UpdateConnectedTrustedDevices();
bindDeviceListBoxes();
labelKeysCounter.Content = TrustedDevices.Count;
if (Files.Count > 0)
{
labelFilesCounter.Content = Files.Count;
}
else if (EncryptedFiles.Count >= 0)
{
labelFilesCounter.Content = EncryptedFiles.Count;
}
var uiSyncContext = SynchronizationContext.Current;
// Decrypt all data and inform a user about authorization status
if (AuthorizationStatus)
{
DidUserLoggedUnauthorized = false;
if (EncryptedFiles.Count > 0)
{
// New Task to decrypt all files
var decryptionTask = Task.Run(() =>
{
string password = DataCryptography.DecryptAESKey(LoggedUser.GetAesKey(), RsaPrivateKey);
GCHandle gCHandle = GCHandle.Alloc(password, GCHandleType.Pinned);
foreach (string encryptedFilePath in EncryptedFiles)
{
string filePath = DataCryptography.FileDecrypt(encryptedFilePath, password);
Files.Add(filePath);
}
DataCryptography.ZeroMemory(gCHandle.AddrOfPinnedObject(), password.Length * 2);
gCHandle.Free();
});
decryptionTask.Wait();
EncryptedFiles.Clear();
IOClass.SaveFilesList(Files, this.UserFilesFilepath);
IOClass.SaveFilesList(EncryptedFiles, this.UserEncryptedFilesFilepath);
}
uiSyncContext.Post((s) =>
{
labelStatus.Foreground = new SolidColorBrush(Colors.GreenYellow);
labelStatus.Content = "Authorized";
IconLock.Kind = MahApps.Metro.IconPacks.PackIconMaterialKind.LockOpen;
IconLock.Foreground = new SolidColorBrush(Colors.GreenYellow);
bindFilesListBox();
}, null);
}
else // Encrypt all data and inform a user about authorization status
{
// Prevents from double encryption if user logs in unauthorized
if (!DidUserLoggedUnauthorized && Files.Count > 0)
{
// New Task to encrypt all files
var encryptionTask = Task.Run(() =>
{
string password = DataCryptography.DecryptAESKey(LoggedUser.GetAesKey(), RsaPrivateKey);
GCHandle gCHandle = GCHandle.Alloc(password, GCHandleType.Pinned);
foreach (string filePath in Files)
{
string encryptedFilePath = DataCryptography.FileEncrypt(filePath, password);
EncryptedFiles.Add(encryptedFilePath);
}
DataCryptography.ZeroMemory(gCHandle.AddrOfPinnedObject(), password.Length * 2);
gCHandle.Free();
});
encryptionTask.Wait();
Files.Clear();
IOClass.SaveFilesList(Files, this.UserFilesFilepath);
IOClass.SaveFilesList(EncryptedFiles, this.UserEncryptedFilesFilepath);
}
uiSyncContext.Post((s) =>
{
labelStatus.Foreground = new SolidColorBrush(Colors.OrangeRed);
labelStatus.Content = "Unauthorized";
IconLock.Kind = MahApps.Metro.IconPacks.PackIconMaterialKind.Lock;
IconLock.Foreground = new SolidColorBrush(Colors.OrangeRed);
bindFilesListBox();
}, null);
}
}
/*
* Stworzyć lepszą walidację zaznaczonych elementów listboxów by operacje nie były dozwolone na obiektach null, które powodują NullReferenceException
*/
#region Constructor
/// <summary>
/// Sets default values and starts a new task which checks connected devices
/// </summary>
public MainWindow(string username)
{
InitializeComponent();
DidUserLoggedUnauthorized = true;
DeviceListChanged = false;
deleteTrustedDeviceBtn.IsEnabled = false;
labelUsername.Content = "Hello " + username;
RsaPrivateKey = string.Empty;
AuthorizationStatus = false;
this.Username = username;
List <User> usersList = IOClass.ReadUsersList();
string hashedUsername = DataCryptography.SHA512(username);
bindFilesListBox();
bindFoldersListBox();
foreach (User user in usersList)
{
if (user.GetUsername().Equals(hashedUsername))
{
LoggedUser = user;
}
}
labelSecurityQuestion.Content = LoggedUser.GetQuestion();
this.UserFilesFilepath = @"C:\PAAK\" + username + @"\files.json";
this.UserFoldersFilepath = @"C:\PAAK\" + username + @"\folders.json";
this.UserKeyDataFilepath = @"C:\PAAK\" + username + @"\data.json";
this.UserEncryptedFilesFilepath = @"C:\PAAK\" + username + @"\encryptedFiles.json";
var uiSyncContext = SynchronizationContext.Current;
var loopTask = Task.Run(() =>
{
while (true)
{
Task.Delay(1000);
UpdateConnectedDevices();
if (DeviceListChanged)
{
if (ConnectedTrustedDevices != null)
{
if (ConnectedTrustedDevices.Count.Equals(1))
{
AuthorizationStatus = true;
if (RsaPrivateKey.Equals(string.Empty))
{
RsaPrivateKey = IOClass.ReadPrivateKeyFromDeviceToString(ConnectedTrustedDevices[0].Path);
}
}
else
{
AuthorizationStatus = false;
}
}
uiSyncContext.Post((s) =>
{
UpdateDevicesStatus();
}, null);
}
}
});
}
