private static void OnClientMessageBinary(byte[] obj)
{
// Check if we're running in exam mode already, if yes, then refuse to load a .seb file
if (SEBClientInfo.examMode)
{
Logger.AddInformation("Reconfiguring SEB using the downloaded Config File data is not allowed because it is already running in exam mode, sending command ReconfigureAborted to browser");
SEBXULRunnerWebSocketServer.SendMessage(new SEBXULMessage(SEBXULMessage.SEBXULHandler.ReconfigureAborted));
SebWindowsClientMain.LoadingSebFile(false);
SebWindowsClientForm.ShowReconfigureNotAllowed();
return;
}
HasBeenReconfiguredByMessage = true;
Logger.AddInformation("Received downloaded Config File data, " + obj.Length + " bytes. Sending command SebFileTransfer to browser");
SEBXULRunnerWebSocketServer.SendMessage(new SEBXULMessage(SEBXULMessage.SEBXULHandler.SebFileTransfer, true));
if (SEBClientInfo.SebWindowsClientForm.ReconfigureWithSettings(obj))
{
Logger.AddInformation("SEB was successfully reconfigured using the downloaded Config File data");
// Convert new URL Filter rules to XUL seb2 rules
// and add Start URL to allowed rules
SEBURLFilter urlFilter = new SEBURLFilter();
urlFilter.UpdateFilterRules();
// Create JSON object with XULRunner parameters to pass to firefox.exe as base64 string
var xulRunnerSettings = DeepClone(SEBSettings.settingsCurrent);
string XULRunnerParameters = SEBXulRunnerSettings.XULRunnerConfigDictionarySerialize(xulRunnerSettings);
SEBXULRunnerWebSocketServer.SendMessage(new SEBXULMessage(SEBXULMessage.SEBXULHandler.Reconfigure, new { configBase64 = XULRunnerParameters }));
}
else
{
Logger.AddInformation("Reconfiguring SEB using the downloaded Config File data failed, sending command ReconfigureAborted to browser");
SEBXULRunnerWebSocketServer.SendMessage(new SEBXULMessage(SEBXULMessage.SEBXULHandler.ReconfigureAborted));
}
HasBeenReconfiguredByMessage = false;
}
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.");
}
}