/// <summary>
/// Capture keystrokes and filter which key events are permitted to continue.
/// </summary>
private static IntPtr CaptureMouseButton(int nCode, IntPtr wp, IntPtr lp)
{
// If the nCode is non-negative, filter the key stroke.
if (nCode >= 0)
{
if (
(bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyTouchOptimized) &&
(bool)
SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyEnableTouchExit))
{
TestTouchExitSequence(System.Windows.Forms.Cursor.Position);
}
//KBDLLHOOKSTRUCT KeyInfo =
// (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lp, typeof(KBDLLHOOKSTRUCT));
// Reject any key that's not on our list.
if (DisableMouseButton(nCode, wp, lp))
{
return((IntPtr)1);
}
}
// Pass the event to the next hook in the chain.
return(CallNextHookEx(ptrMouseHook, nCode, wp, lp));
}
private void btnCancel_Click(object sender, EventArgs e)
{
this.txtQuitPassword.Text = "";
this.Visible = false;
if ((bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyTouchOptimized))
{
var topWindow = SEBWindowHandler.GetOpenWindows().FirstOrDefault();
if (topWindow.Value != null)
{
topWindow.Key.AdaptWindowToWorkingArea();
}
}
}
public static void ShowKeyboard(bool force = false)
{
try
{
if (IsPhysicalKeyboardAttached() && !force && (int)SEBSettings.settingsCurrent[SEBSettings.KeyOskBehavior] == 2)
{
return;
}
if (!(bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyTouchOptimized))
{
return;
}
if (IsKeyboardVisible())
{
return;
}
if (!SEBWindowHandler.AllowedExecutables.Contains("tabtip.exe"))
{
SEBWindowHandler.AllowedExecutables.Add("tabtip.exe");
}
//TODO: Use Environment Variable here, but with SEB running as 32bit it always takes X86
//string programFiles = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles);
string programFiles = @"C:\Program Files";
string inkDir = @"Common Files\Microsoft Shared\ink";
string onScreenKeyboardPath = Path.Combine(programFiles, inkDir, "TabTip.exe");
Process.Start(onScreenKeyboardPath);
if (OnKeyboardStateChanged != null)
{
var t = new System.Timers.Timer {
Interval = 500
};
t.Elapsed += (sender, args) =>
{
if (!IsKeyboardVisible())
{
t.Stop();
OnKeyboardStateChanged(false);
}
};
t.Start();
OnKeyboardStateChanged(true);
}
}
catch
{ }
}
private static IntPtr CaptureMouseButton(int nCode, IntPtr wp, IntPtr lp)
{
if (nCode >= 0)
{
if ((bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "touchOptimized") && (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "enableTouchExit"))
{
SebKeyCapture.TestTouchExitSequence(Cursor.Position);
}
if (SebKeyCapture.DisableMouseButton(nCode, wp, lp))
{
return((IntPtr)1);
}
}
return(SebKeyCapture.CallNextHookEx(SebKeyCapture.ptrMouseHook, nCode, wp, lp));
}
private void ResizeTopOpenWindow()
{
try
{
if ((bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyTouchOptimized))
{
var topWindow = SEBWindowHandler.GetOpenWindows().FirstOrDefault();
if (topWindow.Value != null)
{
topWindow.Key.AdaptWindowToWorkingArea();
}
}
}
catch
{ }
}
private void btnCancel_Click(object sender, EventArgs e)
{
this.txtQuitPassword.Text = "";
this.Visible = false;
if (!(bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "touchOptimized"))
{
return;
}
KeyValuePair <IntPtr, string> keyValuePair = SEBWindowHandler.GetOpenWindows().FirstOrDefault <KeyValuePair <IntPtr, string> >();
if (keyValuePair.Value == null)
{
return;
}
keyValuePair.Key.AdaptWindowToWorkingArea(new int?());
}
/// ----------------------------------------------------------------------------------------
/// <summary>
/// Helper method: Get preferences dictionary from decrypted data.
/// In editing mode, users have to enter the right SEB administrator password
/// before they can access the settings contents
/// and returns the decrypted bytes
/// </summary>
/// ----------------------------------------------------------------------------------------
private static DictObj GetPreferencesDictFromConfigData(byte[] sebData, bool forEditing)
{
DictObj sebPreferencesDict = null;
try
{
// Get preferences dictionary from decrypted data
sebPreferencesDict = (DictObj)Plist.readPlist(sebData);
}
catch (Exception readPlistException)
{
MessageBox.Show(SEBUIStrings.loadingSettingsFailed, SEBUIStrings.loadingSettingsFailedReason, MessageBoxButtons.OK, MessageBoxIcon.Error);
Console.WriteLine(readPlistException.Message);
return(null);
}
// In editing mode, the user has to enter the right SEB administrator password used in those settings before he can access their contents
if (forEditing)
{
// Get the admin password set in these settings
string sebFileHashedAdminPassword = (string)SEBSettings.valueForDictionaryKey(sebPreferencesDict, SEBSettings.KeyHashedAdminPassword);
// If there was no or empty admin password set in these settings, the user can access them anyways
if (!String.IsNullOrEmpty(sebFileHashedAdminPassword))
{
// Get the current hashed admin password
string hashedAdminPassword = (string)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyHashedAdminPassword);
if (hashedAdminPassword == null)
{
hashedAdminPassword = "";
}
// If the current hashed admin password is same as the hashed admin password from the settings file
// then the user is allowed to access the settings
if (String.Compare(hashedAdminPassword, sebFileHashedAdminPassword, StringComparison.OrdinalIgnoreCase) != 0)
{
// otherwise we have to ask for the SEB administrator password used in those settings and
// allow opening settings only if the user enters the right one
if (!askForPasswordAndCompareToHashedPassword(sebFileHashedAdminPassword, forEditing))
{
return(null);
}
}
}
}
// Reading preferences was successful!
return(sebPreferencesDict);
}
/// ----------------------------------------------------------------------------------------
/// <summary>
/// Compute a Browser Exam Key SHA256 hash base16 string.
/// </summary>
/// ----------------------------------------------------------------------------------------
public static string ComputeBrowserExamKey()
{
// Serialize preferences dictionary to an XML string
string sebXML = Plist.writeXml(SEBSettings.settingsCurrent);
//Add the Hash of the Executable and of the XulRunnerFiles to the message
sebXML = String.Format("{0}{1}", sebXML, ComputeSEBComponentsHash());
byte[] message = Encoding.UTF8.GetBytes(sebXML);
byte[] salt = (byte[])SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyExamKeySalt);
var hash = new HMACSHA256(salt);
byte[] browserExamKey = hash.ComputeHash(message);
string browserExamKeyString = BitConverter.ToString(browserExamKey);
return(browserExamKeyString.Replace("-", "").ToLower());
}
/// <summary>
/// Test app exit keys sequence
/// </summary>
private static void TestAppExitSequences(IntPtr wp, IntPtr lp)
{
if (wp == (IntPtr)WM_KEYDOWN)
{
if (SetAndTestCtrlQExitSequence(wp, lp))
{
SEBClientInfo.SebWindowsClientForm.ShowCloseDialogForm();
}
if (SetAndTestExitKeySequence(wp, lp) && (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyIgnoreExitKeys) == false)
{
SEBClientInfo.SebWindowsClientForm.ExitApplication();
}
}
else if (wp == (IntPtr)WM_KEYUP)
{
ResetCtrlQExitSequence(wp, lp);
ResetExitKeySequence(wp, lp);
}
}
public static void InitializeLogger()
{
if (!(bool)SEBClientInfo.getSebSetting("enableLogging")["enableLogging"])
{
return;
}
string name = (string)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "logDirectoryWin");
if (!string.IsNullOrEmpty(name))
{
SEBClientInfo.SebClientLogFileDirectory = Environment.ExpandEnvironmentVariables(name);
SEBClientInfo.SebClientLogFile = string.Format("{0}\\{1}", (object)SEBClientInfo.SebClientLogFileDirectory, (object)"SebClient.log");
}
else
{
SEBClientInfo.SetDefaultClientLogFile();
}
Logger.InitLogger(SEBClientInfo.SebClientLogFileDirectory, (string)null);
}
private void ResizeTopOpenWindow()
{
try
{
if (!(bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "touchOptimized"))
{
return;
}
KeyValuePair <IntPtr, string> keyValuePair = SEBWindowHandler.GetOpenWindows().FirstOrDefault <KeyValuePair <IntPtr, string> >();
if (keyValuePair.Value == null)
{
return;
}
keyValuePair.Key.AdaptWindowToWorkingArea(new int?());
}
catch
{
}
}
/// <summary>
/// Initialise Logger if it's enabled.
/// </summary>
public static void InitializeLogger()
{
if ((Boolean)getSebSetting(SEBSettings.KeyEnableLogging)[SEBSettings.KeyEnableLogging])
{
string logDirectory = (string)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyLogDirectoryWin);
if (!String.IsNullOrEmpty(logDirectory))
{
// Expand environment variables in log file path
SebClientLogFileDirectory = Environment.ExpandEnvironmentVariables(logDirectory);
SebClientLogFile = String.Format(@"{0}\{1}", SebClientLogFileDirectory, SEB_CLIENT_LOG);
}
else
{
SEBClientInfo.SetDefaultClientLogFile();
}
Logger.InitLogger(SEBClientInfo.SebClientLogFileDirectory, null);
}
}
public static void CheckIfTabletModeIsEnabled()
{
if ((bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyTouchOptimized))
{
bool?tabletMode = null;
try
{
//returns null if the key is not existing (another windows version than 10)
tabletMode = (int)Registry.GetValue("HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\ImmersiveShell", "TabletMode", 1) == 1;
}
catch (Exception ex)
{
Logger.AddError("Unable to check for tablet mode, assuming its not a Windows Version with a tablet mode and if so, ignore this error", null, ex, ex.StackTrace);
}
if (tabletMode != null && tabletMode == false)
{
SEBMessageBox.Show(SEBUIStrings.tableModeNotEnabledWarningTitle, SEBUIStrings.tableModeNotEnabledWarningText, MessageBoxIcon.Error, MessageBoxButtons.OK);
Logger.AddInformation("Windows Tablet mode was not enabled, exiting seb", null, null);
throw new SEBNotAllowedToRunEception("SEB not running without Tablet mode...");
}
}
}
public static void CheckDistributionIntegrity()
{
string path1 = SEBXulRunnerSettings.ResolveResourcePath((string)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "startURL"));
string path2 = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData), "SafeExamBrowser", "SebClientSettings.seb");
if (!File.Exists(path1))
{
throw new Exception(string.Format("Distribution is corrupted, file \"{0}\" isn't exists, it's insecure to run app now.", (object)path1));
}
if (!File.Exists(path2))
{
throw new Exception(string.Format("Distribution is corrupted, file \"{0}\" isn't exists, it's insecure to run app now.", (object)path2));
}
byte[] array = ((IEnumerable <byte>)File.ReadAllBytes(path1)).Concat <byte>((IEnumerable <byte>)File.ReadAllBytes(path2)).ToArray <byte>();
string base64String;
using (MD5 md5 = MD5.Create())
base64String = Convert.ToBase64String(md5.ComputeHash(array));
if (base64String != IntegrityConstants.IndexCRC)
{
throw new Exception("Distribution was changed externally, it's insecure to run app now.");
}
}
private static Dictionary <string, object> GetPreferencesDictFromConfigData(byte[] sebData, bool forEditing)
{
Dictionary <string, object> dictionary;
try
{
dictionary = (Dictionary <string, object>)Plist.readPlist(sebData);
}
catch (Exception ex)
{
int num = (int)SEBMessageBox.Show(SEBUIStrings.loadingSettingsFailed, SEBUIStrings.loadingSettingsFailedReason, MessageBoxIcon.Hand, MessageBoxButtons.OK, forEditing);
Console.WriteLine(ex.Message);
return((Dictionary <string, object>)null);
}
if (forEditing)
{
string str = (string)SEBSettings.valueForDictionaryKey(dictionary, "hashedAdminPassword");
if (!string.IsNullOrEmpty(str) && (string.Compare((string)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "hashedAdminPassword") ?? "", str, StringComparison.OrdinalIgnoreCase) != 0 && !SEBConfigFileManager.askForPasswordAndCompareToHashedPassword(str, forEditing)))
{
return((Dictionary <string, object>)null);
}
}
return(dictionary);
}
private static void TestAppExitSequences(IntPtr wp, IntPtr lp)
{
if (wp == (IntPtr)256)
{
if (SebKeyCapture.SetAndTestCtrlQExitSequence(wp, lp))
{
SEBClientInfo.SebWindowsClientForm.ShowCloseDialogForm();
}
if (!SebKeyCapture.SetAndTestExitKeySequence(wp, lp) || (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "ignoreExitKeys"))
{
return;
}
SEBClientInfo.SebWindowsClientForm.ExitApplication(true);
}
else
{
if (!(wp == (IntPtr)257))
{
return;
}
SebKeyCapture.ResetCtrlQExitSequence(wp, lp);
SebKeyCapture.ResetExitKeySequence(wp, lp);
}
}
public static void CheckIfRunViaRemoteConnection()
{
if (System.Windows.Forms.SystemInformation.TerminalServerSession && !(bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyAllowScreenSharing))
{
SEBMessageBox.Show(SEBUIStrings.detectedRemoteConnection, SEBUIStrings.detectedRemoteConnectionMessage, MessageBoxIcon.Error, MessageBoxButtons.OK);
Logger.AddError("Forbidden to run SEB via Terminal Session!", null, null);
Logger.AddInformation("Safe Exam Browser is exiting", null, null);
throw new SEBNotAllowedToRunEception("Forbidden to run SEB via Terminal Session!");
}
}
/// ----------------------------------------------------------------------------------------
/// <summary>
/// Decrypt, parse and use new SEB settings
/// </summary>
/// ----------------------------------------------------------------------------------------
public static bool StoreDecryptedSEBSettings(byte[] sebData)
{
DictObj sebPreferencesDict;
string sebFilePassword = null;
bool passwordIsHash = false;
X509Certificate2 sebFileCertificateRef = null;
sebPreferencesDict = DecryptSEBSettings(sebData, false, ref sebFilePassword, ref passwordIsHash, ref sebFileCertificateRef);
if (sebPreferencesDict == null)
{
return(false); //Decryption didn't work, we abort
}
Logger.AddInformation("Reconfiguring");
// Reset SEB, close third party applications
SEBClientInfo.SebWindowsClientForm.closeSebClient = false;
Logger.AddInformation("Attempting to CloseSEBForm for reconfiguration");
SEBClientInfo.SebWindowsClientForm.CloseSEBForm();
Logger.AddInformation("Succesfully CloseSEBForm for reconfiguration");
SEBClientInfo.SebWindowsClientForm.closeSebClient = true;
//SEBClientInfo.SebWindowsClientForm.Close();
//SEBClientInfo.SebWindowsClientForm.Dispose();
// We need to check if setting for createNewDesktop changed
SEBClientInfo.CreateNewDesktopOldValue = (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyCreateNewDesktop);
if ((int)sebPreferencesDict[SEBSettings.KeySebConfigPurpose] == (int)SEBSettings.sebConfigPurposes.sebConfigPurposeStartingExam)
{
///
/// If these SEB settings are ment to start an exam
///
Logger.AddInformation("Reconfiguring to start an exam");
/// If these SEB settings are ment to start an exam
// Store decrypted settings
Logger.AddInformation("Attempting to StoreSebClientSettings");
SEBSettings.StoreSebClientSettings(sebPreferencesDict);
Logger.AddInformation("Successfully StoreSebClientSettings");
// Set the flag that SEB is running in exam mode now
SEBClientInfo.examMode = true;
//Re-initialize logger
SEBClientInfo.InitializeLogger();
// Check if SEB is running on the standard desktop and the new settings demand to run in new desktop (createNewDesktop = true)
// or the other way around!
if (SEBClientInfo.CreateNewDesktopOldValue != (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyCreateNewDesktop))
{
// If it did, SEB needs to quit and be restarted manually for the new setting to take effekt
if (SEBClientInfo.CreateNewDesktopOldValue == false)
{
SEBMessageBox.Show(SEBUIStrings.settingsRequireNewDesktop, SEBUIStrings.settingsRequireNewDesktopReason, MessageBoxIcon.Error, MessageBoxButtons.OK);
}
else
{
SEBMessageBox.Show(SEBUIStrings.settingsRequireNotNewDesktop, SEBUIStrings.settingsRequireNotNewDesktopReason, MessageBoxIcon.Error, MessageBoxButtons.OK);
}
//SEBClientInfo.SebWindowsClientForm.closeSebClient = true;
SEBClientInfo.SebWindowsClientForm.ExitApplication();
}
// Re-Initialize SEB according to the new settings
Logger.AddInformation("Attemting to InitSEBDesktop for reconfiguration");
if (!SebWindowsClientMain.InitSEBDesktop())
{
return(false);
}
Logger.AddInformation("Sucessfully InitSEBDesktop for reconfiguration");
// Re-open the main form
//SEBClientInfo.SebWindowsClientForm = new SebWindowsClientForm();
//SebWindowsClientMain.singleInstanceController.SetMainForm(SEBClientInfo.SebWindowsClientForm);
//return if initializing SEB with openend preferences was successful
Logger.AddInformation("Attempting to OpenSEBForm for reconfiguration");
var ret = SEBClientInfo.SebWindowsClientForm.OpenSEBForm();
Logger.AddInformation("Successfully OpenSEBForm for reconfiguration");
return(ret);
}
else
{
///
/// If these SEB settings are ment to configure a client
///
Logger.AddInformation("Reconfiguring to configure a client");
/// If these SEB settings are ment to configure a client
// Check if we have embedded identities and import them into the Windows Certifcate Store
ListObj embeddedCertificates = (ListObj)sebPreferencesDict[SEBSettings.KeyEmbeddedCertificates];
for (int i = embeddedCertificates.Count - 1; i >= 0; i--)
{
// Get the Embedded Certificate
DictObj embeddedCertificate = (DictObj)embeddedCertificates[i];
// Is it an identity?
if ((int)embeddedCertificate[SEBSettings.KeyType] == 1)
{
// Store the identity into the Windows Certificate Store
SEBProtectionController.StoreCertificateIntoStore((byte[])embeddedCertificate[SEBSettings.KeyCertificateData]);
}
// Remove the identity from settings, as it should be only stored in the Certificate Store and not in the locally stored settings file
embeddedCertificates.RemoveAt(i);
}
// Store decrypted settings
SEBSettings.StoreSebClientSettings(sebPreferencesDict);
//Re-initialize logger
SEBClientInfo.InitializeLogger();
// Write new settings to the localapp directory
SEBSettings.WriteSebConfigurationFile(SEBClientInfo.SebClientSettingsAppDataFile, "", false, null, SEBSettings.sebConfigPurposes.sebConfigPurposeConfiguringClient);
// Re-Initialize SEB desktop according to the new settings
if (!SebWindowsClientMain.InitSEBDesktop())
{
return(false);
}
if (SEBClientInfo.SebWindowsClientForm.OpenSEBForm())
{
// Activate SebWindowsClient so the message box gets focus
//SEBClientInfo.SebWindowsClientForm.Activate();
// Check if setting for createNewDesktop changed
if (SEBClientInfo.CreateNewDesktopOldValue != (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyCreateNewDesktop))
{
// If it did, SEB needs to quit and be restarted manually for the new setting to take effekt
SEBMessageBox.Show(SEBUIStrings.sebReconfiguredRestartNeeded, SEBUIStrings.sebReconfiguredRestartNeededReason, MessageBoxIcon.Warning, MessageBoxButtons.OK);
//SEBClientInfo.SebWindowsClientForm.closeSebClient = true;
SEBClientInfo.SebWindowsClientForm.ExitApplication();
}
if (SEBMessageBox.Show(SEBUIStrings.sebReconfigured, SEBUIStrings.sebReconfiguredQuestion, MessageBoxIcon.Question, MessageBoxButtons.YesNo) == DialogResult.No)
{
//SEBClientInfo.SebWindowsClientForm.closeSebClient = true;
SEBClientInfo.SebWindowsClientForm.ExitApplication();
}
return(true); //reading preferences was successful
}
else
{
return(false);
}
}
}
public static void ShowKeyboard(bool force = false)
{
try
{
if (TapTipHandler.IsPhysicalKeyboardAttached() && !force && (int)SEBSettings.settingsCurrent["oskBehavior"] == 2 || (!(bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "touchOptimized") || TapTipHandler.IsKeyboardVisible()))
{
return;
}
if (!SEBWindowHandler.AllowedExecutables.Contains("tabtip.exe"))
{
SEBWindowHandler.AllowedExecutables.Add("tabtip.exe");
}
Process.Start(Path.Combine("C:\\Program Files", "Common Files\\Microsoft Shared\\ink", "TabTip.exe"));
// ISSUE: reference to a compiler-generated field
if (TapTipHandler.OnKeyboardStateChanged == null)
{
return;
}
Timer t = new Timer()
{
Interval = 500.0
};
t.Elapsed += (ElapsedEventHandler)((sender, args) =>
{
if (TapTipHandler.IsKeyboardVisible())
{
return;
}
t.Stop();
// ISSUE: reference to a compiler-generated field
TapTipHandler.OnKeyboardStateChanged(false);
});
t.Start();
// ISSUE: reference to a compiler-generated field
TapTipHandler.OnKeyboardStateChanged(true);
}
catch
{
}
}
/// ----------------------------------------------------------------------------------------
/// <summary>
/// Helper method which decrypts the byte array using an empty password,
/// or the administrator password currently set in SEB
/// or asks for the password used for encrypting this SEB file
/// for configuring the client
/// </summary>
/// ----------------------------------------------------------------------------------------
private static DictObj DecryptDataWithPasswordForConfiguringClient(byte[] sebData, bool forEditing, ref string sebFilePassword, ref bool passwordIsHash)
{
passwordIsHash = false;
string password;
// First try to decrypt with the current admin password
// get admin password hash
string hashedAdminPassword = (string)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, SEBSettings.KeyHashedAdminPassword);
if (hashedAdminPassword == null)
{
hashedAdminPassword = "";
}
// We use always uppercase letters in the base16 hashed admin password used for encrypting
hashedAdminPassword = hashedAdminPassword.ToUpper();
DictObj sebPreferencesDict = null;
byte[] decryptedSebData = SEBProtectionController.DecryptDataWithPassword(sebData, hashedAdminPassword);
if (decryptedSebData == null)
{
// If decryption with admin password didn't work, try it with an empty password
decryptedSebData = SEBProtectionController.DecryptDataWithPassword(sebData, "");
if (decryptedSebData == null)
{
// If decryption with empty and admin password didn't work, ask for the password the .seb file was encrypted with
// Allow up to 5 attempts for entering decoding password
int i = 5;
password = null;
string enterPasswordString = SEBUIStrings.enterEncryptionPassword;
do
{
i--;
// Prompt for password
password = SebPasswordDialogForm.ShowPasswordDialogForm(SEBUIStrings.reconfiguringLocalSettings, enterPasswordString);
// If cancel was pressed, abort
if (password == null)
{
return(null);
}
string hashedPassword = SEBProtectionController.ComputePasswordHash(password);
// we try to decrypt with the hashed password
decryptedSebData = SEBProtectionController.DecryptDataWithPassword(sebData, hashedPassword);
// in case we get an error we allow the user to try it again
enterPasswordString = SEBUIStrings.enterEncryptionPasswordAgain;
} while (decryptedSebData == null && i > 0);
if (decryptedSebData == null)
{
//wrong password entered in 5th try: stop reading .seb file
MessageBox.Show(SEBUIStrings.reconfiguringLocalSettingsFailed, SEBUIStrings.reconfiguringLocalSettingsFailedWrongPassword, MessageBoxButtons.OK, MessageBoxIcon.Error);
return(null);
}
else
{
// Decrypting with entered password worked: We save it for returning it later
if (forEditing)
{
sebFilePassword = password;
}
}
}
}
else
{
//decrypting with hashedAdminPassword worked: we save it for returning as decryption password
sebFilePassword = hashedAdminPassword;
// identify that password as hash
passwordIsHash = true;
}
/// Decryption worked
// Ungzip the .seb (according to specification >= v14) decrypted serialized XML plist data
decryptedSebData = GZipByte.Decompress(decryptedSebData);
// Check if the openend reconfiguring seb file has the same admin password inside like the current one
try
{
sebPreferencesDict = (DictObj)Plist.readPlist(decryptedSebData);
}
catch (Exception readPlistException)
{
// Error when deserializing the decrypted configuration data
// We abort reading the new settings here
MessageBox.Show(SEBUIStrings.loadingSettingsFailed, SEBUIStrings.loadingSettingsFailedReason, MessageBoxButtons.OK, MessageBoxIcon.Error);
Console.WriteLine(readPlistException.Message);
return(null);
}
// Get the admin password set in these settings
string sebFileHashedAdminPassword = (string)SEBSettings.valueForDictionaryKey(sebPreferencesDict, SEBSettings.KeyHashedAdminPassword);
if (sebFileHashedAdminPassword == null)
{
sebFileHashedAdminPassword = "";
}
// Has the SEB config file the same admin password inside as the current settings have?
if (String.Compare(hashedAdminPassword, sebFileHashedAdminPassword, StringComparison.OrdinalIgnoreCase) != 0)
{
//No: The admin password inside the .seb file wasn't the same as the current one
if (forEditing)
{
// If the file is openend for editing (and not to reconfigure SEB)
// we have to ask the user for the admin password inside the file
if (!askForPasswordAndCompareToHashedPassword(sebFileHashedAdminPassword, forEditing))
{
// If the user didn't enter the right password we abort
return(null);
}
}
else
{
// The file was actually opened for reconfiguring the SEB client:
// we have to ask for the current admin password and
// allow reconfiguring only if the user enters the right one
// We don't check this for the case the current admin password was used to encrypt the new settings
// In this case there can be a new admin pw defined in the new settings and users don't need to enter the old one
if (passwordIsHash == false && hashedAdminPassword.Length > 0)
{
// Allow up to 5 attempts for entering current admin password
int i = 5;
password = null;
string hashedPassword;
string enterPasswordString = SEBUIStrings.enterCurrentAdminPwdForReconfiguring;
bool passwordsMatch;
do
{
i--;
// Prompt for password
password = SebPasswordDialogForm.ShowPasswordDialogForm(SEBUIStrings.reconfiguringLocalSettings, enterPasswordString);
// If cancel was pressed, abort
if (password == null)
{
return(null);
}
if (password.Length == 0)
{
hashedPassword = "";
}
else
{
hashedPassword = SEBProtectionController.ComputePasswordHash(password);
}
passwordsMatch = (String.Compare(hashedPassword, hashedAdminPassword, StringComparison.OrdinalIgnoreCase) == 0);
// in case we get an error we allow the user to try it again
enterPasswordString = SEBUIStrings.enterCurrentAdminPwdForReconfiguringAgain;
} while (!passwordsMatch && i > 0);
if (!passwordsMatch)
{
//wrong password entered in 5th try: stop reading .seb file
MessageBox.Show(SEBUIStrings.reconfiguringLocalSettingsFailed, SEBUIStrings.reconfiguringLocalSettingsFailedWrongCurrentAdminPwd, MessageBoxButtons.OK, MessageBoxIcon.Error);
return(null);
}
}
}
}
// We need to set the right value for the key sebConfigPurpose to know later where to store the new settings
sebPreferencesDict[SEBSettings.KeySebConfigPurpose] = (int)SEBSettings.sebConfigPurposes.sebConfigPurposeConfiguringClient;
// Reading preferences was successful!
return(sebPreferencesDict);
}
private static Dictionary <string, object> DecryptDataWithPasswordForConfiguringClient(byte[] sebData, bool forEditing, ref string sebFilePassword, ref bool passwordIsHash)
{
passwordIsHash = false;
string upper = ((string)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "hashedAdminPassword") ?? "").ToUpper();
byte[] input1 = SEBProtectionController.DecryptDataWithPassword(sebData, upper);
string str1;
if (input1 == null)
{
input1 = SEBProtectionController.DecryptDataWithPassword(sebData, "");
if (input1 == null)
{
int num1 = 5;
str1 = (string)null;
string passwordRequestText = SEBUIStrings.enterEncryptionPassword;
string input2;
do
{
--num1;
input2 = ThreadedDialog.ShowPasswordDialogForm(SEBUIStrings.reconfiguringLocalSettings, passwordRequestText);
if (input2 == null)
{
return((Dictionary <string, object>)null);
}
string passwordHash = SEBProtectionController.ComputePasswordHash(input2);
input1 = SEBProtectionController.DecryptDataWithPassword(sebData, passwordHash);
passwordRequestText = SEBUIStrings.enterEncryptionPasswordAgain;
}while (input1 == null && num1 > 0);
if (input1 == null)
{
int num2 = (int)SEBMessageBox.Show(SEBUIStrings.reconfiguringLocalSettingsFailed, SEBUIStrings.reconfiguringLocalSettingsFailedWrongPassword, MessageBoxIcon.Hand, MessageBoxButtons.OK, forEditing);
return((Dictionary <string, object>)null);
}
if (forEditing)
{
sebFilePassword = input2;
}
}
}
else
{
sebFilePassword = upper;
passwordIsHash = true;
}
byte[] data = GZipByte.Decompress(input1);
Dictionary <string, object> dictionary;
try
{
dictionary = (Dictionary <string, object>)Plist.readPlist(data);
}
catch (Exception ex)
{
int num = (int)SEBMessageBox.Show(SEBUIStrings.loadingSettingsFailed, SEBUIStrings.loadingSettingsFailedReason, MessageBoxIcon.Hand, MessageBoxButtons.OK, forEditing);
Console.WriteLine(ex.Message);
return((Dictionary <string, object>)null);
}
string str2 = (string)SEBSettings.valueForDictionaryKey(dictionary, "hashedAdminPassword") ?? "";
if (string.Compare(upper, str2, StringComparison.OrdinalIgnoreCase) != 0)
{
if (forEditing)
{
if (!SEBConfigFileManager.askForPasswordAndCompareToHashedPassword(str2, forEditing))
{
return((Dictionary <string, object>)null);
}
}
else if (!passwordIsHash && upper.Length > 0)
{
int num1 = 5;
str1 = (string)null;
string passwordRequestText = SEBUIStrings.enterCurrentAdminPwdForReconfiguring;
bool flag;
do
{
--num1;
string input2 = ThreadedDialog.ShowPasswordDialogForm(SEBUIStrings.reconfiguringLocalSettings, passwordRequestText);
if (input2 == null)
{
return((Dictionary <string, object>)null);
}
flag = string.Compare(input2.Length != 0 ? SEBProtectionController.ComputePasswordHash(input2) : "", upper, StringComparison.OrdinalIgnoreCase) == 0;
passwordRequestText = SEBUIStrings.enterCurrentAdminPwdForReconfiguringAgain;
}while (!flag && num1 > 0);
if (!flag)
{
int num2 = (int)SEBMessageBox.Show(SEBUIStrings.reconfiguringLocalSettingsFailed, SEBUIStrings.reconfiguringLocalSettingsFailedWrongCurrentAdminPwd, MessageBoxIcon.Hand, MessageBoxButtons.OK, forEditing);
return((Dictionary <string, object>)null);
}
}
}
dictionary["sebConfigPurpose"] = (object)1;
return(dictionary);
}
public static bool StoreDecryptedSEBSettings(byte[] sebData)
{
string sebFilePassword = (string)null;
bool passwordIsHash = false;
X509Certificate2 sebFileCertificateRef = (X509Certificate2)null;
Dictionary <string, object> settingsDict = SEBConfigFileManager.DecryptSEBSettings(sebData, false, ref sebFilePassword, ref passwordIsHash, ref sebFileCertificateRef);
if (settingsDict == null)
{
return(false);
}
Logger.AddInformation("Reconfiguring", (object)null, (Exception)null, (string)null);
SEBClientInfo.SebWindowsClientForm.closeSebClient = false;
Logger.AddInformation("Attempting to CloseSEBForm for reconfiguration", (object)null, (Exception)null, (string)null);
SEBClientInfo.SebWindowsClientForm.CloseSEBForm();
Logger.AddInformation("Succesfully CloseSEBForm for reconfiguration", (object)null, (Exception)null, (string)null);
SEBClientInfo.SebWindowsClientForm.closeSebClient = true;
SEBClientInfo.CreateNewDesktopOldValue = (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "createNewDesktop");
if ((int)settingsDict["sebConfigPurpose"] == 0)
{
Logger.AddInformation("Reconfiguring to start an exam", (object)null, (Exception)null, (string)null);
Logger.AddInformation("Attempting to StoreSebClientSettings", (object)null, (Exception)null, (string)null);
SEBSettings.StoreSebClientSettings(settingsDict);
Logger.AddInformation("Successfully StoreSebClientSettings", (object)null, (Exception)null, (string)null);
SEBClientInfo.examMode = true;
SEBClientInfo.InitializeLogger();
if (SEBClientInfo.CreateNewDesktopOldValue != (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "createNewDesktop"))
{
if (!SEBClientInfo.CreateNewDesktopOldValue)
{
int num1 = (int)SEBMessageBox.Show(SEBUIStrings.settingsRequireNewDesktop, SEBUIStrings.settingsRequireNewDesktopReason, MessageBoxIcon.Hand, MessageBoxButtons.OK, false);
}
else
{
int num2 = (int)SEBMessageBox.Show(SEBUIStrings.settingsRequireNotNewDesktop, SEBUIStrings.settingsRequireNotNewDesktopReason, MessageBoxIcon.Hand, MessageBoxButtons.OK, false);
}
SEBClientInfo.SebWindowsClientForm.ExitApplication(true);
}
Logger.AddInformation("Attemting to InitSEBDesktop for reconfiguration", (object)null, (Exception)null, (string)null);
if (!SebWindowsClientMain.InitSEBDesktop())
{
return(false);
}
Logger.AddInformation("Sucessfully InitSEBDesktop for reconfiguration", (object)null, (Exception)null, (string)null);
Logger.AddInformation("Attempting to OpenSEBForm for reconfiguration", (object)null, (Exception)null, (string)null);
int num = SEBClientInfo.SebWindowsClientForm.OpenSEBForm() ? 1 : 0;
Logger.AddInformation("Successfully OpenSEBForm for reconfiguration", (object)null, (Exception)null, (string)null);
return(num != 0);
}
Logger.AddInformation("Reconfiguring to configure a client", (object)null, (Exception)null, (string)null);
List <object> objectList = (List <object>)settingsDict["embeddedCertificates"];
for (int index = objectList.Count - 1; index >= 0; --index)
{
Dictionary <string, object> dictionary = (Dictionary <string, object>)objectList[index];
if ((int)dictionary["type"] == 1)
{
SEBProtectionController.StoreCertificateIntoStore((byte[])dictionary["certificateData"]);
}
objectList.RemoveAt(index);
}
SEBSettings.StoreSebClientSettings(settingsDict);
SEBClientInfo.InitializeLogger();
SEBSettings.WriteSebConfigurationFile(SEBClientInfo.SebClientSettingsAppDataFile, "", false, (X509Certificate2)null, SEBSettings.sebConfigPurposes.sebConfigPurposeConfiguringClient, false);
if (!SebWindowsClientMain.InitSEBDesktop() || !SEBClientInfo.SebWindowsClientForm.OpenSEBForm())
{
return(false);
}
if (SEBClientInfo.CreateNewDesktopOldValue != (bool)SEBSettings.valueForDictionaryKey(SEBSettings.settingsCurrent, "createNewDesktop"))
{
int num = (int)SEBMessageBox.Show(SEBUIStrings.sebReconfiguredRestartNeeded, SEBUIStrings.sebReconfiguredRestartNeededReason, MessageBoxIcon.Exclamation, MessageBoxButtons.OK, false);
SEBClientInfo.SebWindowsClientForm.ExitApplication(true);
}
if (SEBMessageBox.Show(SEBUIStrings.sebReconfigured, SEBUIStrings.sebReconfiguredQuestion, MessageBoxIcon.Question, MessageBoxButtons.YesNo, false) == DialogResult.No)
{
SEBClientInfo.SebWindowsClientForm.ExitApplication(true);
}
return(true);
}