using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
//
// SEBClientInfo.cs
// SafeExamBrowser
//
// Copyright (c) 2010-2020 Viktor Tomas, Dirk Bauer, Daniel R. Schneider, Pascal Wyss,
// ETH Zurich, Educational Development and Technology (LET),
// based on the original idea of Safe Exam Browser
// by Stefan Schneider, University of Giessen
// Project concept: Thomas Piendl, Daniel R. Schneider,
// Dirk Bauer, Kai Reuter, Tobias Halbherr, Karsten Burger, Marco Lehre,
// Brigitte Schmucki, Oliver Rahs. French localization: Nicolas Dunand
//
// ``The contents of this file are subject to the Mozilla Public License
// Version 1.1 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is Safe Exam Browser for Windows.
//
// The Initial Developers of the Original Code are Viktor Tomas,
// Dirk Bauer, Daniel R. Schneider, Pascal Wyss.
// Portions created by Viktor Tomas, Dirk Bauer, Daniel R. Schneider, Pascal Wyss
// are Copyright (c) 2010-2020 Viktor Tomas, Dirk Bauer, Daniel R. Schneider,
// Pascal Wyss, ETH Zurich, Educational Development and Technology (LET),
// based on the original idea of Safe Exam Browser
// by Stefan Schneider, University of Giessen. All Rights Reserved.
//
// Contributor(s): ______________________________________.
//
namespace SebWindowsConfig.Utilities
{
public enum chooseFileToUploadPolicies
{
manuallyWithFileRequester = 0,
attemptUploadSameFileDownloadedBefore = 1,
onlyAllowUploadSameFileDownloadedBefore = 2
};
public enum newBrowserWindowPolicies
{
getGenerallyBlocked = 0,
openInSameWindow = 1,
openInNewWindow = 2
};
public enum sebServicePolicies
{
ignoreService = 0,
indicateMissingService = 1,
forceSebService = 2
};
public enum browserViewModes
{
browserViewModeWindow = 0,
browserViewModeFullscreen = 1
};
// MAC
public enum sebPurposePolicies
{
sebPurposePolicyStartingExam = 0,
sebPurposePolicyConfiguringClient = 1
};
public enum URLFilterRuleActions
{
block = 0,
allow = 1,
ignore = 2,
unknown = 3
};
public enum SEBMinMacOSVersion
{
SEBMinOSX10_7 = 0,
SEBMinOSX10_8 = 1,
SEBMinOSX10_9 = 2,
SEBMinOSX10_10 = 3,
SEBMinOSX10_11 = 4,
SEBMinMacOS10_12 = 5,
SEBMinMacOS10_13 = 6,
SEBMinMacOS10_14 = 7
};
public class SEBClientInfo
{
#region Imports
[DllImport("kernel32.Dll")]
public static extern short GetVersionEx(ref OSVERSIONINFO o);
#endregion
// Socket protocol
//static int ai_family = AF_INET;
//static int ai_socktype = SOCK_STREAM;
//static int ai_protocol = IPPROTO_TCP;
#region Constants
// Name and location of SEB configuration files and logfiles
public const string SEB_CLIENT_CONFIG = "SebClientSettings.seb";
public const string SEB_CLIENT_LOG = "SebClient.log";
private const string XUL_RUNNER_CONFIG = "config.json";
public const string SEB_SHORTNAME = "SEB";
public const string XUL_RUNNER = "firefox.exe";
private const string XUL_RUNNER_INI = "seb.ini";
// Application path contains [MANUFACTURER]\[PRODUCT_NAME]
// (see also "SebWindowsPackageSetup" Project in MS Visual Studio 10)
public const string MANUFACTURER_LOCAL = "SafeExamBrowser";
//private const string MANUFACTURER = "ETH Zuerich";
public const string PRODUCT_NAME = "SafeExamBrowser";
public const string SEB_SERVICE_DIRECTORY = "SebWindowsServiceWCF";
public const string SEB_BROWSER_DIRECTORY = "SebWindowsBrowser";
private const string XUL_RUNNER_DIRECTORY = "xulrunner";
private const string XUL_SEB_DIRECTORY = "xul_seb";
public const string FILENAME_SEB = "SafeExamBrowser.exe";
public const string FILENAME_SEBCONFIGTOOL = "SEBConfigTool.exe";
public const string FILENAME_SEBSERVICE = "SebWindowsServiceWCF.exe";
public const string FILENAME_DLL_FLECK = "Fleck.dll";
public const string FILENAME_DLL_ICONLIB = "IconLib.dll";
public const string FILENAME_DLL_IONICZIP = "Ionic.Zip.dll";
public const string FILENAME_DLL_METRO = "MetroFramework.dll";
public const string FILENAME_DLL_NAUDIO = "NAudio.dll";
public const string FILENAME_DLL_NEWTONSOFTJSON = "Newtonsoft.Json.dll";
public const string FILENAME_DLL_SERVICECONTRACTS = "SEBWindowsServiceContracts.dll";
public const string BROWSER_USERAGENT_DESKTOP = "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0";
public const string BROWSER_USERAGENT_TOUCH = "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0; Touch) Gecko/20100101 Firefox/52.0";
public const string BROWSER_USERAGENT_TOUCH_IPAD = "Mozilla/5.0 (iPad; CPU OS 11_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.3 Mobile/15E216 Safari/605.1.15";
public const string BROWSER_USERAGENT_SEB = "SEB";
public const string END_OF_STRING_KEYWORD = "---SEB---";
private const string DEFAULT_USERNAME = "";
private const string DEFAULT_HOSTNAME = "localhost";
private const string DEFAULT_HOST_IP_ADDRESS = "127.0.0.1";
private const int DEFAULT_PORTNUMBER = 57016;
public const string DEFAULT_KEY = "Di𝈭l𝈖Ch𝈒aht𝈁aHai1972";
private const int DEFAULT_SEND_INTERVAL = 100;
private const int DEFAULT_RECV_TIMEOUT = 100;
private const int DEFAULT_NUM_MESSAGES = 3;
public const string SEB_NEW_DESKTOP_NAME = "SEBDesktop";
public const string SEB_WINDOWS_SERVICE_NAME = "SebWindowsService";
#endregion
#region Public Properties
public static bool ExplorerShellWasKilled { get; set; }
public static bool IsNewOS { get; set; }
public static bool examMode = false;
// SEB Client Socket properties
public static char[] UserNameRegistryFlags { get; set; }
public static char[] RegistryFlags { get; set; }
public static string HostName { get; set; }
public static string HostIpAddress { get; set; }
public static string UserName { get; set; }
public static char[] UserSid { get; set; }
public static int PortNumber { get; set; }
public static int SendInterval { get; set; }
public static int RecvTimeout { get; set; }
public static int NumMessages { get; set; }
public static int MessageNr { get; set; }
public static string DesktopName { get; set; }
// SEB Client Directories properties
public static string ApplicationExecutableDirectory { get; set; }
public static string ProgramFilesX86Directory { get; set; }
public static bool LogFileDesiredMsgHook { get; set; }
public static bool LogFileDesiredSebClient { get; set; }
public static string SebClientLogFileDirectory { get; set; }
public static string SebClientDirectory { get; set; }
public static string SebClientLogFile { get; set; }
public static string SebClientSettingsProgramDataDirectory { get; set; }
public static string SebClientSettingsAppDataDirectory { get; set; }
public static string XulRunnerAdditionalDictionariesDirectory { get; set; }
public static string XulRunnerDirectory { get; set; }
public static string XulSebDirectory { get; set; }
public static string SebClientSettingsProgramDataFile;
public static string SebClientSettingsAppDataFile;
public static string XulRunnerConfigFileDirectory { get; set; }
public static string XulRunnerConfigFile;
public static string XulRunnerExePath;
public static string XulRunnerSebIniPath;
public static string XulRunnerParameter;
//public static string XulRunnerFlashContainerState { get; set; }
public static string ExamUrl { get; set; }
public static string QuitPassword { get; set; }
public static string QuitHashcode { get; set; }
//public static Dictionary<string, object> sebSettings = new Dictionary<string, object>();
public static string LoadingSettingsFileName = "";
public static float scaleFactor = 1;
public static int appChooserHeight = 132;
#endregion
#region Structures
/// <summary>
/// Stores windows version info.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct OSVERSIONINFO
{
public int dwOSVersionInfoSize;
public int dwMajorVersion;
public int dwMinorVersion;
public int dwBuildNumber;
public int dwPlatformId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
public string szCSDVersion;
}
#endregion
//public static SEBClientConfig sebClientConfig;
public static Dictionary<string, object> getSebSetting(string key)
{
object sebSetting = null;
try
{
sebSetting = SEBSettings.settingsCurrent[key];
}
catch
{
sebSetting = null;
}
if (sebSetting != null)
return SEBSettings.settingsCurrent;
else
return SEBSettings.settingsDefault;
}
/// <summary>
/// Sets user, host info, send-recv interval, recv timeout, Logger and read SebClient configuration.
/// </summary>
/// <returns></returns>
public static bool SetSebClientConfiguration()
{
bool setSebClientConfiguration = false;
// Initialise socket properties
IsNewOS = false;
ExplorerShellWasKilled = false;
UserNameRegistryFlags = new char[100];
RegistryFlags = new char[50];
UserSid = new char[512];
UserName = DEFAULT_USERNAME;
HostName = DEFAULT_HOSTNAME;
HostIpAddress = DEFAULT_HOST_IP_ADDRESS;
PortNumber = DEFAULT_PORTNUMBER;
SendInterval = DEFAULT_SEND_INTERVAL;
RecvTimeout = DEFAULT_RECV_TIMEOUT;
NumMessages = DEFAULT_NUM_MESSAGES;
//Sets paths to files SEB has to save or read from the file system
SetSebPaths();
byte[] sebClientSettings = null;
// Create a string builder for a temporary log (until we can write it with the Logger)
StringBuilder tempLogStringBuilder = new StringBuilder();
// Try to read the SebClientSettigs.seb file from the program data directory
try
{
sebClientSettings = File.ReadAllBytes(SebClientSettingsProgramDataFile);
}
catch (Exception streamReadException)
{
// Write error into string with temporary log string builder
tempLogStringBuilder.Append("Could not load SebClientSettigs.seb from the Program Data directory").Append(streamReadException == null ? null : streamReadException.GetType().ToString()).Append(streamReadException.Message);
}
if (sebClientSettings == null)
{
// Try to read the SebClientSettigs.seb file from the local application data directory
try
{
sebClientSettings = File.ReadAllBytes(SebClientSettingsAppDataFile);
}
catch (Exception streamReadException)
{
// Write error into string with temporary log string builder
tempLogStringBuilder.Append("Could not load SebClientSettigs.seb from the Roaming Application Data directory. ").Append(streamReadException == null ? null : streamReadException.GetType().ToString()).Append(streamReadException.Message);
}
}
// Store the decrypted configuration settings.
if (!SEBSettings.StoreDecryptedSebClientSettings(sebClientSettings))
return false;
// Initialise Logger, if enabled
InitializeLogger();
// Save the temporary log string into the log
Logger.AddError(tempLogStringBuilder.ToString(), null, null);
// Set username
UserName = Environment.UserName;
setSebClientConfiguration = true;
// Write settings into log
StringBuilder userInfo =
new StringBuilder ("User Name: " ).Append(UserName)
.Append(" Host Name: " ).Append(HostName)
.Append(" Port Number: " ).Append(PortNumber)
.Append(" Send Interval: " ).Append(SendInterval)
.Append(" Recv Timeout: " ).Append(RecvTimeout)
.Append(" Num Messages: " ).Append(NumMessages)
.Append(" SebClientConfigFileDirectory: ").Append(SebClientSettingsAppDataDirectory)
.Append(" SebClientConfigFile: " ).Append(SebClientSettingsAppDataFile);
Logger.AddInformation(userInfo.ToString(), null, null);
return setSebClientConfiguration;
}
/// <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);
}
}
/// <summary>
/// Sets paths to files SEB has to save or read from the file system.
/// </summary>
public static void SetSebPaths()
{
// Get the path of the directory the application executable lies in
ApplicationExecutableDirectory = Path.GetDirectoryName(Application.ExecutablePath);
// Get the path of the "Program Files X86" directory.
ProgramFilesX86Directory = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86);
// Get the path of the "Program Data" and "Local Application Data" directory.
string programDataDirectory = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData); //GetEnvironmentVariable("PROGRAMMDATA");
string appDataDirectory = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
/// Get paths for the two possible locations of the SebClientSettings.seb file
///
// In the program data directory (for managed systems, only an administrator can write in this directory):
// If there is a SebClientSettigs.seb file, then this has priority and is used by the SEB client, another
// SebClientSettigs.seb file in the local app data folder is ignored then and the SEB client cannot be
// reconfigured by opening a .seb file saved for configuring a client
StringBuilder sebClientSettingsProgramDataDirectoryBuilder = new StringBuilder(programDataDirectory).Append("\\").Append(MANUFACTURER_LOCAL).Append("\\"); //.Append(PRODUCT_NAME).Append("\\");
SebClientSettingsProgramDataDirectory = sebClientSettingsProgramDataDirectoryBuilder.ToString();
// In the local application data directory (for unmanaged systems like student computers, user can write in this directory):
// A SebClientSettigs.seb file in this directory can be created or replaced by opening a .seb file saved for configuring a client
StringBuilder sebClientSettingsAppDataDirectoryBuilder = new StringBuilder(appDataDirectory).Append("\\").Append(MANUFACTURER_LOCAL).Append("\\"); //.Append(PRODUCT_NAME).Append("\\");
SebClientSettingsAppDataDirectory = sebClientSettingsAppDataDirectoryBuilder.ToString();
// Set the location of the SebWindowsClientDirectory
StringBuilder sebClientDirectoryBuilder = new StringBuilder(ProgramFilesX86Directory).Append("\\").Append(PRODUCT_NAME).Append("\\");
SebClientDirectory = sebClientDirectoryBuilder.ToString();
// The directory into which additional dictionaries are extracted.
XulRunnerAdditionalDictionariesDirectory = Path.Combine(SebClientSettingsAppDataDirectory, "Dictionaries");
// Set the location of the XulRunnerDirectory
//StringBuilder xulRunnerDirectoryBuilder = new StringBuilder(SebClientDirectory).Append(XUL_RUNNER_DIRECTORY).Append("\\");
//XulRunnerDirectory = xulRunnerDirectoryBuilder.ToString();
StringBuilder xulRunnerDirectoryBuilder = new StringBuilder(SEB_BROWSER_DIRECTORY).Append("\\").Append(XUL_RUNNER_DIRECTORY).Append("\\");
XulRunnerDirectory = xulRunnerDirectoryBuilder.ToString();
// Set the location of the XulSebDirectory
//StringBuilder xulSebDirectoryBuilder = new StringBuilder(SebClientDirectory).Append(XUL_SEB_DIRECTORY).Append("\\");
//XulSebDirectory = xulSebDirectoryBuilder.ToString();
StringBuilder xulSebDirectoryBuilder = new StringBuilder(SEB_BROWSER_DIRECTORY).Append("\\").Append(XUL_SEB_DIRECTORY).Append("\\");
XulSebDirectory = xulSebDirectoryBuilder.ToString();
// Set the location of the XulRunnerExePath
//StringBuilder xulRunnerExePathBuilder = new StringBuilder("\"").Append(XulRunnerDirectory).Append(XUL_RUNNER).Append("\"");
//XulRunnerExePath = xulRunnerExePathBuilder.ToString();
StringBuilder xulRunnerExePathBuilder = new StringBuilder(XulRunnerDirectory).Append(XUL_RUNNER); //.Append("\"");
XulRunnerExePath = xulRunnerExePathBuilder.ToString();
// Set the location of the seb.ini
StringBuilder xulRunnerSebIniPathBuilder = new StringBuilder(XulSebDirectory).Append(XUL_RUNNER_INI); //.Append("\"");
XulRunnerSebIniPath = xulRunnerSebIniPathBuilder.ToString();
// Get the two possible paths of the SebClientSettings.seb file
StringBuilder sebClientSettingsProgramDataBuilder = new StringBuilder(SebClientSettingsProgramDataDirectory).Append(SEB_CLIENT_CONFIG);
SebClientSettingsProgramDataFile = sebClientSettingsProgramDataBuilder.ToString();
StringBuilder sebClientSettingsAppDataBuilder = new StringBuilder(SebClientSettingsAppDataDirectory).Append(SEB_CLIENT_CONFIG);
SebClientSettingsAppDataFile = sebClientSettingsAppDataBuilder.ToString();
// Set the default location of the SebClientLogFileDirectory
SetDefaultClientLogFile();
}
/// <summary>
/// Set the default location of the SebClientLogFileDirectory.
/// </summary>
public static void SetDefaultClientLogFile()
{
StringBuilder SebClientLogFileDirectoryBuilder = new StringBuilder(SebClientSettingsAppDataDirectory); //.Append("\\").Append(MANUFACTURER_LOCAL).Append("\\");
SebClientLogFileDirectory = SebClientLogFileDirectoryBuilder.ToString();
// Set the path of the SebClient.log file
StringBuilder sebClientLogFileBuilder = new StringBuilder(SebClientLogFileDirectory).Append(SEB_CLIENT_LOG);
SebClientLogFile = sebClientLogFileBuilder.ToString();
}
public static bool CreateNewDesktopOldValue { get; set; }
public static string ContractEnvironmentVariables(string path)
{
path = Path.GetFullPath(path);
DictionaryEntry currentEntry = new DictionaryEntry("", "");
foreach (object key in Environment.GetEnvironmentVariables().Keys)
{
string value = (string)Environment.GetEnvironmentVariables()[key];
if (path.ToUpperInvariant().Contains(value.ToUpperInvariant()) && value.Length > ((string)currentEntry.Value).Length)
{
currentEntry.Key = (string)key;
currentEntry.Value = value;
}
}
return path.Replace((string)currentEntry.Value, "%" + (string)currentEntry.Key + "%");
}
}
}