SEBWIN-447: Implemented missing remote session check during session initialization.

SafeExamBrowser.I18n.Contracts/TextKey.cs

@@ -108,6 +108,8 @@ namespace SafeExamBrowser.I18n.Contracts
 		MessageBox_ReconfigurationErrorTitle,
 		MessageBox_ReloadConfirmation,
 		MessageBox_ReloadConfirmationTitle,
+		MessageBox_RemoteSessionNotAllowed,
+		MessageBox_RemoteSessionNotAllowedTitle,
 		MessageBox_ServiceUnavailableError,
 		MessageBox_ServiceUnavailableErrorTitle,
 		MessageBox_ServiceUnavailableWarning,
@@ -155,6 +157,7 @@ namespace SafeExamBrowser.I18n.Contracts
 		OperationStatus_StopMouseInterception,
 		OperationStatus_TerminateBrowser,
 		OperationStatus_TerminateShell,
+		OperationStatus_ValidateRemoteSessionPolicy,
 		OperationStatus_ValidateVirtualMachinePolicy,
 		OperationStatus_WaitExplorerStartup,
 		OperationStatus_WaitExplorerTermination,

SafeExamBrowser.I18n/Data/cn.xml

@@ -246,6 +246,12 @@
     <Entry key="MessageBox_ReloadConfirmationTitle">
         刷新？
     </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowed">
+        系统似乎正在远程会话中运行。所选的配置不允许SEB在远程会话中运行。
+    </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowedTitle">
+        检测到远程会话
+    </Entry>
     <Entry key="MessageBox_ServiceUnavailableError">
         防作弊考试专用浏览器服务初始化失败。防作弊考试专用浏览器现将终止，因为该服务被配置为强制项。
     </Entry>
@@ -375,6 +381,9 @@
     <Entry key="OperationStatus_TerminateShell">
         终止用户界面
     </Entry>
+    <Entry key="OperationStatus_ValidateRemoteSessionPolicy">
+        验证远程会话策略
+    </Entry>
     <Entry key="OperationStatus_ValidateVirtualMachinePolicy">
         验证虚拟机策略
     </Entry>

SafeExamBrowser.I18n/Data/de.xml

@@ -282,6 +282,12 @@
     <Entry key="MessageBox_ReloadConfirmationTitle">
         Neu laden?
     </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowed">
+        Das System scheint in einer Remote-Sitzung zu laufen. Die ausgewählte Konfiguration erlaubt es nicht, SEB in einer Remote-Sitzung auszuführen.
+    </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowedTitle">
+        Remote-Sitzung erkannt
+    </Entry>
     <Entry key="MessageBox_ServiceUnavailableError">
         Fehler beim Initialisieren des SEB-Service! SEB wird sich nun beenden da der Service als obligatorisch konfiguriert ist.
     </Entry>
@@ -423,6 +429,9 @@
     <Entry key="OperationStatus_TerminateShell">
         Beende Benutzeroberfläche
     </Entry>
+    <Entry key="OperationStatus_ValidateRemoteSessionPolicy">
+        Validiere Richtlinie für Remote-Sitzungen
+    </Entry>
     <Entry key="OperationStatus_ValidateVirtualMachinePolicy">
         Validiere Richtlinie für virtuelle Maschinen
     </Entry>

SafeExamBrowser.I18n/Data/en.xml

@@ -282,6 +282,12 @@
     <Entry key="MessageBox_ReloadConfirmationTitle">
         Reload?
     </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowed">
+        The system appears to be running in a remote session. The selected configuration does not allow SEB to be run in a remote session.
+    </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowedTitle">
+        Remote Session Detected
+    </Entry>
     <Entry key="MessageBox_ServiceUnavailableError">
         Failed to initialize the SEB service! SEB will now terminate since the service is configured to be mandatory.
     </Entry>
@@ -423,6 +429,9 @@
     <Entry key="OperationStatus_TerminateShell">
         Terminating user interface
     </Entry>
+    <Entry key="OperationStatus_ValidateRemoteSessionPolicy">
+        Validating remote session policy
+    </Entry>
     <Entry key="OperationStatus_ValidateVirtualMachinePolicy">
         Validating virtual machine policy
     </Entry>

SafeExamBrowser.I18n/Data/fr.xml

@@ -282,6 +282,12 @@
     <Entry key="MessageBox_ReloadConfirmationTitle">
         Recharger ?
     </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowed">
+        Le système semble s'exécuter dans une session à distance. La configuration sélectionnée ne permet pas l'exécution de SEB dans une session à distance.
+    </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowedTitle">
+        Session distante détectée
+    </Entry>
     <Entry key="MessageBox_ServiceUnavailableError">
         Le service SEB n'a pas été initialisé ! Le service SEB va maintenant se terminer puisque le service obligatoire.
     </Entry>
@@ -423,6 +429,9 @@
     <Entry key="OperationStatus_TerminateShell">
         Arrêt de l’interface utilisateur
     </Entry>
+    <Entry key="OperationStatus_ValidateRemoteSessionPolicy">
+        Validation de la directive sur la session à distance
+    </Entry>
     <Entry key="OperationStatus_ValidateVirtualMachinePolicy">
         Validation de la directive sur les machines virtuelles
     </Entry>

SafeExamBrowser.I18n/Data/it.xml

@@ -282,6 +282,12 @@
     <Entry key="MessageBox_ReloadConfirmationTitle">
         Ricaricare?
     </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowed">
+        Il sistema sembra essere in esecuzione in una sessione remota. La configurazione selezionata non consente l'esecuzione di SEB in una sessione remota.
+    </Entry>
+    <Entry key="MessageBox_RemoteSessionNotAllowedTitle">
+        Sessione remota rilevata
+    </Entry>
     <Entry key="MessageBox_ServiceUnavailableError">
         Impossibile inizializzare il servizio SEB! SEB verrà ora terminato poiché il servizio è configurato per essere obbligatorio.
     </Entry>
@@ -423,6 +429,9 @@
     <Entry key="OperationStatus_TerminateShell">
         Chiusura dell'interfaccia utente
     </Entry>
+    <Entry key="OperationStatus_ValidateRemoteSessionPolicy">
+        Convalida dei criteri della sessione remota
+    </Entry>
     <Entry key="OperationStatus_ValidateVirtualMachinePolicy">
         Convalida dei criteri della macchina virtuale
     </Entry>

SafeExamBrowser.Runtime/CompositionRoot.cs

@@ -66,6 +66,7 @@ namespace SafeExamBrowser.Runtime
 			var fileSystem = new FileSystem();
 			var processFactory = new ProcessFactory(ModuleLogger(nameof(ProcessFactory)));
 			var proxyFactory = new ProxyFactory(new ProxyObjectFactory(), ModuleLogger(nameof(ProxyFactory)));
+			var remoteSessionDetector = new RemoteSessionDetector(ModuleLogger(nameof(RemoteSessionDetector)));
 			var runtimeHost = new RuntimeHost(appConfig.RuntimeAddress, new HostObjectFactory(), ModuleLogger(nameof(RuntimeHost)), FIVE_SECONDS);
 			var runtimeWindow = uiFactory.CreateRuntimeWindow(appConfig);
 			var server = new ServerProxy(appConfig, ModuleLogger(nameof(ServerProxy)));
@@ -84,6 +85,7 @@ namespace SafeExamBrowser.Runtime
 			sessionOperations.Enqueue(new SessionInitializationOperation(configuration, fileSystem, logger, runtimeHost, sessionContext));
 			sessionOperations.Enqueue(new ConfigurationOperation(args, configuration, new FileSystem(), new HashAlgorithm(), logger, sessionContext));
 			sessionOperations.Enqueue(new ServerOperation(args, configuration, fileSystem, logger, sessionContext, server));
+			sessionOperations.Enqueue(new RemoteSessionOperation(remoteSessionDetector, logger, sessionContext));
 			sessionOperations.Enqueue(new VirtualMachineOperation(vmDetector, logger, sessionContext));
 			sessionOperations.Enqueue(new ServiceOperation(logger, runtimeHost, serviceProxy, sessionContext, THIRTY_SECONDS, userInfo));
 			sessionOperations.Enqueue(new ClientTerminationOperation(logger, processFactory, proxyFactory, runtimeHost, sessionContext, THIRTY_SECONDS));

SafeExamBrowser.Runtime/Operations/RemoteSessionOperation.cs

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2020 ETH Zürich, Educational Development and Technology (LET)
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using SafeExamBrowser.Core.Contracts.OperationModel;
+using SafeExamBrowser.Core.Contracts.OperationModel.Events;
+using SafeExamBrowser.I18n.Contracts;
+using SafeExamBrowser.Logging.Contracts;
+using SafeExamBrowser.Runtime.Operations.Events;
+using SafeExamBrowser.SystemComponents.Contracts;
+using SafeExamBrowser.UserInterface.Contracts.MessageBox;
+
+namespace SafeExamBrowser.Runtime.Operations
+{
+	internal class RemoteSessionOperation : SessionOperation
+	{
+		private readonly IRemoteSessionDetector detector;
+		private readonly ILogger logger;
+
+		public override event ActionRequiredEventHandler ActionRequired;
+		public override event StatusChangedEventHandler StatusChanged;
+
+		public RemoteSessionOperation(IRemoteSessionDetector detector, ILogger logger, SessionContext context) : base(context)
+		{
+			this.detector = detector;
+			this.logger = logger;
+		}
+
+		public override OperationResult Perform()
+		{
+			return ValidatePolicy();
+		}
+
+		public override OperationResult Repeat()
+		{
+			return ValidatePolicy();
+		}
+
+		public override OperationResult Revert()
+		{
+			return OperationResult.Success;
+		}
+
+		private OperationResult ValidatePolicy()
+		{
+			logger.Info($"Validating remote session policy...");
+			StatusChanged?.Invoke(TextKey.OperationStatus_ValidateRemoteSessionPolicy);
+
+			if (Context.Next.Settings.Service.DisableRemoteConnections && detector.IsRemoteSession())
+			{
+				var args = new MessageEventArgs
+				{
+					Icon = MessageBoxIcon.Error,
+					Message = TextKey.MessageBox_RemoteSessionNotAllowed,
+					Title = TextKey.MessageBox_RemoteSessionNotAllowedTitle
+				};
+
+				logger.Error("Detected remote session while SEB is not allowed to be run in a remote session! Aborting...");
+				ActionRequired?.Invoke(args);
+
+				return OperationResult.Aborted;
+			}
+
+			return OperationResult.Success;
+		}
+	}
+}

SafeExamBrowser.Runtime/Operations/VirtualMachineOperation.cs

@@ -22,15 +22,15 @@ namespace SafeExamBrowser.Runtime.Operations
 		private IVirtualMachineDetector detector;
 		private ILogger logger;
 
+		public override event ActionRequiredEventHandler ActionRequired;
+		public override event StatusChangedEventHandler StatusChanged;
+
 		public VirtualMachineOperation(IVirtualMachineDetector detector, ILogger logger, SessionContext context) : base(context)
 		{
 			this.detector = detector;
 			this.logger = logger;
 		}
 
-		public override event ActionRequiredEventHandler ActionRequired;
-		public override event StatusChangedEventHandler StatusChanged;
-
 		public override OperationResult Perform()
 		{
 			return ValidatePolicy();

SafeExamBrowser.Runtime/SafeExamBrowser.Runtime.csproj

@@ -103,6 +103,7 @@
     <Compile Include="Operations\Events\ServerFailureEventArgs.cs" />
     <Compile Include="Operations\Events\UnexpectedErrorMessageArgs.cs" />
     <Compile Include="Operations\KioskModeOperation.cs" />
+    <Compile Include="Operations\RemoteSessionOperation.cs" />
     <Compile Include="Operations\ServerOperation.cs" />
     <Compile Include="Operations\ServiceOperation.cs" />
     <Compile Include="Operations\SessionActivationOperation.cs" />

SafeExamBrowser.SystemComponents.Contracts/IRemoteSessionDetector.cs

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2020 ETH Zürich, Educational Development and Technology (LET)
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+namespace SafeExamBrowser.SystemComponents.Contracts
+{
+	/// <summary>
+	/// Provides functionality related to remote session detection.
+	/// </summary>
+	public interface IRemoteSessionDetector
+	{
+		/// <summary>
+		/// Indicates whether the system is currently running in a remote session.
+		/// </summary>
+		bool IsRemoteSession();
+	}
+}

SafeExamBrowser.SystemComponents.Contracts/SafeExamBrowser.SystemComponents.Contracts.csproj

@@ -57,6 +57,7 @@
     <Compile Include="Audio\Events\VolumeChangedEventHandler.cs" />
     <Compile Include="Audio\IAudio.cs" />
     <Compile Include="IFileSystem.cs" />
+    <Compile Include="IRemoteSessionDetector.cs" />
     <Compile Include="IVirtualMachineDetector.cs" />
     <Compile Include="PowerSupply\Events\StatusChangedEventHandler.cs" />
     <Compile Include="PowerSupply\IPowerSupply.cs" />

SafeExamBrowser.SystemComponents/RemoteSessionDetector.cs

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2020 ETH Zürich, Educational Development and Technology (LET)
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using System.Windows.Forms;
+using SafeExamBrowser.Logging.Contracts;
+using SafeExamBrowser.SystemComponents.Contracts;
+
+namespace SafeExamBrowser.SystemComponents
+{
+	public class RemoteSessionDetector : IRemoteSessionDetector
+	{
+		private readonly ILogger logger;
+
+		public RemoteSessionDetector(ILogger logger)
+		{
+			this.logger = logger;
+		}
+
+		public bool IsRemoteSession()
+		{
+			var isRemoteSession = SystemInformation.TerminalServerSession;
+
+			logger.Debug($"System appears {(isRemoteSession ? "" : "not ")}to be running in a remote session.");
+
+			return isRemoteSession;
+		}
+	}
+}

SafeExamBrowser.SystemComponents/SafeExamBrowser.SystemComponents.csproj

@@ -70,6 +70,7 @@
     <Compile Include="PowerSupply\PowerSupply.cs" />
     <Compile Include="PowerSupply\PowerSupplyStatus.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="RemoteSessionDetector.cs" />
     <Compile Include="SystemInfo.cs" />
     <Compile Include="UserInfo.cs" />
     <Compile Include="VirtualMachineDetector.cs" />