public static byte[] EncryptSEBSettingsWithCredentials(string settingsPassword, bool passwordIsHash, X509Certificate2 certificateRef, SEBSettings.sebConfigPurposes configPurpose, bool forEditing)
{
byte[] bytes = Encoding.UTF8.GetBytes(Plist.writeXml((object)SEBSettings.settingsCurrent).Replace("<array />", "<array></array>").Replace("<dict />", "<dict></dict>").Replace("<data />", "<data></data>"));
string password = (string)null;
if (string.IsNullOrEmpty(settingsPassword) && configPurpose == SEBSettings.sebConfigPurposes.sebConfigPurposeConfiguringClient)
{
password = "";
}
else if (string.IsNullOrEmpty(settingsPassword) && certificateRef == null)
{
if (SEBMessageBox.Show(SEBUIStrings.noEncryptionChosen, SEBUIStrings.noEncryptionChosenSaveUnencrypted, MessageBoxIcon.Question, MessageBoxButtons.YesNo, forEditing) == DialogResult.Yes)
{
return(bytes);
}
return((byte[])null);
}
byte[] data = GZipByte.Compress(bytes);
if (!string.IsNullOrEmpty(settingsPassword))
{
password = settingsPassword;
}
byte[] numArray1;
if (password != null)
{
numArray1 = SEBConfigFileManager.EncryptDataUsingPassword(data, password, passwordIsHash, configPurpose);
}
else
{
byte[] numArray2 = new byte[data.Length + 4];
Buffer.BlockCopy((Array)Encoding.UTF8.GetBytes("plnd"), 0, (Array)numArray2, 0, 4);
Buffer.BlockCopy((Array)data, 0, (Array)numArray2, 4, data.Length);
numArray1 = (byte[])numArray2.Clone();
}
if (certificateRef != null)
{
numArray1 = SEBConfigFileManager.EncryptDataUsingIdentity(numArray1, certificateRef);
}
return(GZipByte.Compress(numArray1));
}
///// ----------------------------------------------------------------------------------------
///// <summary>
///// Show SEB Password Dialog Form.
///// </summary>
///// ----------------------------------------------------------------------------------------
//public static string ShowPasswordDialogForm(string title, string passwordRequestText)
//{
// // Set the title of the dialog window
// sebPasswordDialogForm.Text = title;
// // Set the text of the dialog
// sebPasswordDialogForm.LabelText = passwordRequestText;
// sebPasswordDialogForm.txtSEBPassword.Focus();
// // If we are running in SebWindowsClient we need to activate it before showing the password dialog
// if (SEBClientInfo.SebWindowsClientForm != null) SebWindowsClientForm.SEBToForeground(); //SEBClientInfo.SebWindowsClientForm.Activate();
// // Show password dialog as a modal dialog and determine if DialogResult = OK.
// if (sebPasswordDialogForm.ShowDialog() == DialogResult.OK)
// {
// // Read the contents of testDialog's TextBox.
// string password = sebPasswordDialogForm.txtSEBPassword.Text;
// sebPasswordDialogForm.txtSEBPassword.Text = "";
// //sebPasswordDialogForm.txtSEBPassword.Focus();
// return password;
// }
// else
// {
// return null;
// }
//}
/// Generate Encrypted .seb Settings Data
/// ----------------------------------------------------------------------------------------
/// <summary>
/// Read SEB settings from UserDefaults and encrypt them using provided security credentials
/// </summary>
/// ----------------------------------------------------------------------------------------
public static byte[] EncryptSEBSettingsWithCredentials(string settingsPassword, bool passwordIsHash, X509Certificate2 certificateRef, SEBSettings.sebConfigPurposes configPurpose, bool forEditing)
{
// Get current settings dictionary and clean it from empty arrays and dictionaries
//DictObj cleanedCurrentSettings = SEBSettings.CleanSettingsDictionary();
// Serialize preferences dictionary to an XML string
string sebXML = Plist.writeXml(SEBSettings.settingsCurrent);
string cleanedSebXML = sebXML.Replace("<array />", "<array></array>");
cleanedSebXML = cleanedSebXML.Replace("<dict />", "<dict></dict>");
cleanedSebXML = cleanedSebXML.Replace("<data />", "<data></data>");
byte[] encryptedSebData = Encoding.UTF8.GetBytes(cleanedSebXML);
string encryptingPassword = null;
// Check for special case: .seb configures client, empty password
if (String.IsNullOrEmpty(settingsPassword) && configPurpose == SEBSettings.sebConfigPurposes.sebConfigPurposeConfiguringClient)
{
encryptingPassword = "";
}
else
{
// in all other cases:
// Check if no password entered and no identity selected
if (String.IsNullOrEmpty(settingsPassword) && certificateRef == null)
{
if (SEBMessageBox.Show(SEBUIStrings.noEncryptionChosen, SEBUIStrings.noEncryptionChosenSaveUnencrypted, MessageBoxIcon.Question, MessageBoxButtons.YesNo, neverShowTouchOptimized: forEditing) == DialogResult.Yes)
{
// OK: save .seb config data unencrypted
return(encryptedSebData);
}
else
{
return(null);
}
}
}
// gzip the serialized XML data
encryptedSebData = GZipByte.Compress(encryptedSebData);
// Check if password for encryption is provided and use it then
if (!String.IsNullOrEmpty(settingsPassword))
{
encryptingPassword = settingsPassword;
}
// So if password is empty (special case) or provided
if (!(encryptingPassword == null))
{
// encrypt with password
encryptedSebData = EncryptDataUsingPassword(encryptedSebData, encryptingPassword, passwordIsHash, configPurpose);
}
else
{
// Create byte array large enough to hold prefix and data
byte[] encryptedData = new byte[encryptedSebData.Length + PREFIX_LENGTH];
// if no encryption with password: Add a 4-char prefix identifying plain data
string prefixString = PLAIN_DATA_MODE;
Buffer.BlockCopy(Encoding.UTF8.GetBytes(prefixString), 0, encryptedData, 0, PREFIX_LENGTH);
// append plain data
Buffer.BlockCopy(encryptedSebData, 0, encryptedData, PREFIX_LENGTH, encryptedSebData.Length);
encryptedSebData = (byte[])encryptedData.Clone();
}
// Check if cryptographic identity for encryption is selected
if (certificateRef != null)
{
// Encrypt preferences using a cryptographic identity
encryptedSebData = EncryptDataUsingIdentity(encryptedSebData, certificateRef);
}
// gzip the encrypted data
encryptedSebData = GZipByte.Compress(encryptedSebData);
return(encryptedSebData);
}
/// ----------------------------------------------------------------------------------------
/// <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 = ThreadedDialog.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
SEBMessageBox.Show(SEBUIStrings.reconfiguringLocalSettingsFailed, SEBUIStrings.reconfiguringLocalSettingsFailedWrongPassword, MessageBoxIcon.Error, MessageBoxButtons.OK, neverShowTouchOptimized: forEditing);
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
SEBMessageBox.Show(SEBUIStrings.loadingSettingsFailed, SEBUIStrings.loadingSettingsFailedReason, MessageBoxIcon.Error, MessageBoxButtons.OK, neverShowTouchOptimized: forEditing);
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 = ThreadedDialog.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
SEBMessageBox.Show(SEBUIStrings.reconfiguringLocalSettingsFailed, SEBUIStrings.reconfiguringLocalSettingsFailedWrongCurrentAdminPwd, MessageBoxIcon.Error, MessageBoxButtons.OK, neverShowTouchOptimized: forEditing);
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);
}
/// ----------------------------------------------------------------------------------------
/// <summary>
/// Decrypt and deserialize SEB settings
/// When forEditing = true, then the decrypting password the user entered and/or
/// certificate reference found in the .seb file is returned
/// </summary>
/// ----------------------------------------------------------------------------------------
public static DictObj DecryptSEBSettings(byte[] sebData, bool forEditing, ref string sebFilePassword, ref bool passwordIsHash, ref X509Certificate2 sebFileCertificateRef)
{
// Ungzip the .seb (according to specification >= v14) source data
byte[] unzippedSebData = GZipByte.Decompress(sebData);
// if unzipped data is not null, then unzipping worked, we use unzipped data
// if unzipped data is null, then the source data may be an uncompressed .seb file, we proceed with it
if (unzippedSebData != null)
{
sebData = unzippedSebData;
}
string prefixString;
// save the data including the first 4 bytes for the case that it's acutally an unencrypted XML plist
byte[] sebDataUnencrypted = sebData.Clone() as byte[];
// Get 4-char prefix
prefixString = GetPrefixStringFromData(ref sebData);
//// Check prefix identifying encryption modes
// Prefix = pkhs ("Public Key Hash") ?
if (prefixString.CompareTo(PUBLIC_KEY_HASH_MODE) == 0)
{
// Decrypt with cryptographic identity/private key
sebData = DecryptDataWithPublicKeyHashPrefix(sebData, forEditing, ref sebFileCertificateRef);
if (sebData == null)
{
return(null);
}
// Get 4-char prefix again
// and remaining data without prefix, which is either plain or still encoded with password
prefixString = GetPrefixStringFromData(ref sebData);
}
// Prefix = pswd ("Password") ?
if (prefixString.CompareTo(PASSWORD_MODE) == 0)
{
// Decrypt with password
// if the user enters the right one
byte[] sebDataDecrypted = null;
string password;
// Allow up to 5 attempts for entering decoding password
string enterPasswordString = SEBUIStrings.enterPassword;
int i = 5;
do
{
i--;
// Prompt for password
password = ThreadedDialog.ShowPasswordDialogForm(SEBUIStrings.loadingSettings, enterPasswordString);
if (password == null)
{
return(null);
}
//error = nil;
sebDataDecrypted = SEBProtectionController.DecryptDataWithPassword(sebData, password);
enterPasswordString = SEBUIStrings.enterPasswordAgain;
// in case we get an error we allow the user to try it again
} while ((sebDataDecrypted == null) && i > 0);
if (sebDataDecrypted == null)
{
//wrong password entered in 5th try: stop reading .seb file
SEBMessageBox.Show(SEBUIStrings.decryptingSettingsFailed, SEBUIStrings.decryptingSettingsFailedReason, MessageBoxIcon.Error, MessageBoxButtons.OK, neverShowTouchOptimized: forEditing);
return(null);
}
sebData = sebDataDecrypted;
// If these settings are being decrypted for editing, we return the decryption password
if (forEditing)
{
sebFilePassword = password;
}
}
else
{
// Prefix = pwcc ("Password Configuring Client") ?
if (prefixString.CompareTo(PASSWORD_CONFIGURING_CLIENT_MODE) == 0)
{
// Decrypt with password and configure local client settings
// and quit afterwards, returning if reading the .seb file was successfull
DictObj sebSettings = DecryptDataWithPasswordForConfiguringClient(sebData, forEditing, ref sebFilePassword, ref passwordIsHash);
return(sebSettings);
}
else
{
// Prefix = plnd ("Plain Data") ?
if (prefixString.CompareTo(PLAIN_DATA_MODE) != 0)
{
// No valid 4-char prefix was found in the .seb file
// Check if .seb file is unencrypted
if (prefixString.CompareTo(UNENCRYPTED_MODE) == 0)
{
// .seb file seems to be an unencrypted XML plist
// get the original data including the first 4 bytes
sebData = sebDataUnencrypted;
}
else
{
// No valid prefix and no unencrypted file with valid header
// cancel reading .seb file
SEBMessageBox.Show(SEBUIStrings.settingsNotUsable, SEBUIStrings.settingsNotUsableReason, MessageBoxIcon.Error, MessageBoxButtons.OK, neverShowTouchOptimized: forEditing);
return(null);
}
}
}
}
// If we don't deal with an unencrypted seb file
// ungzip the .seb (according to specification >= v14) decrypted serialized XML plist data
if (prefixString.CompareTo(UNENCRYPTED_MODE) != 0)
{
sebData = GZipByte.Decompress(sebData);
}
// Get preferences dictionary from decrypted data
DictObj sebPreferencesDict = GetPreferencesDictFromConfigData(sebData, forEditing);
// If we didn't get a preferences dict back, we abort reading settings
if (sebPreferencesDict == null)
{
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.sebConfigPurposeStartingExam;
// 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 Dictionary <string, object> DecryptSEBSettings(byte[] sebData, bool forEditing, ref string sebFilePassword, ref bool passwordIsHash, ref X509Certificate2 sebFileCertificateRef)
{
byte[] numArray1 = GZipByte.Decompress(sebData);
if (numArray1 != null)
{
sebData = numArray1;
}
byte[] numArray2 = sebData.Clone() as byte[];
string prefixStringFromData = SEBConfigFileManager.GetPrefixStringFromData(ref sebData);
if (prefixStringFromData.CompareTo("pkhs") == 0)
{
sebData = SEBConfigFileManager.DecryptDataWithPublicKeyHashPrefix(sebData, forEditing, ref sebFileCertificateRef);
if (sebData == null)
{
return((Dictionary <string, object>)null);
}
prefixStringFromData = SEBConfigFileManager.GetPrefixStringFromData(ref sebData);
}
if (prefixStringFromData.CompareTo("pswd") == 0)
{
string passwordRequestText = SEBUIStrings.enterPassword;
int num1 = 5;
string passphrase;
byte[] numArray3;
do
{
--num1;
passphrase = ThreadedDialog.ShowPasswordDialogForm(SEBUIStrings.loadingSettings, passwordRequestText);
if (passphrase == null)
{
return((Dictionary <string, object>)null);
}
numArray3 = SEBProtectionController.DecryptDataWithPassword(sebData, passphrase);
passwordRequestText = SEBUIStrings.enterPasswordAgain;
}while (numArray3 == null && num1 > 0);
if (numArray3 == null)
{
int num2 = (int)SEBMessageBox.Show(SEBUIStrings.decryptingSettingsFailed, SEBUIStrings.decryptingSettingsFailedReason, MessageBoxIcon.Hand, MessageBoxButtons.OK, forEditing);
return((Dictionary <string, object>)null);
}
sebData = numArray3;
if (forEditing)
{
sebFilePassword = passphrase;
}
}
else
{
if (prefixStringFromData.CompareTo("pwcc") == 0)
{
return(SEBConfigFileManager.DecryptDataWithPasswordForConfiguringClient(sebData, forEditing, ref sebFilePassword, ref passwordIsHash));
}
if (prefixStringFromData.CompareTo("plnd") != 0)
{
if (prefixStringFromData.CompareTo("<?xm") == 0)
{
sebData = numArray2;
}
else
{
int num = (int)SEBMessageBox.Show(SEBUIStrings.settingsNotUsable, SEBUIStrings.settingsNotUsableReason, MessageBoxIcon.Hand, MessageBoxButtons.OK, forEditing);
return((Dictionary <string, object>)null);
}
}
}
if (prefixStringFromData.CompareTo("<?xm") != 0)
{
sebData = GZipByte.Decompress(sebData);
}
Dictionary <string, object> dictFromConfigData = SEBConfigFileManager.GetPreferencesDictFromConfigData(sebData, forEditing);
if (dictFromConfigData == null)
{
return((Dictionary <string, object>)null);
}
dictFromConfigData["sebConfigPurpose"] = (object)0;
return(dictFromConfigData);
}