136 lines
3.2 KiB
C#
136 lines
3.2 KiB
C#
/*
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* Copyright (c) 2024 ETH Zürich, IT Services
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using SafeExamBrowser.Core.Contracts.OperationModel;
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using SafeExamBrowser.Core.Contracts.OperationModel.Events;
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using SafeExamBrowser.I18n.Contracts;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.Monitoring.Contracts.System;
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namespace SafeExamBrowser.Runtime.Operations
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{
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internal class SessionIntegrityOperation : SessionOperation
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{
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private readonly ILogger logger;
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private readonly ISystemSentinel sentinel;
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public override event ActionRequiredEventHandler ActionRequired { add { } remove { } }
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public override event StatusChangedEventHandler StatusChanged;
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public SessionIntegrityOperation(ILogger logger, ISystemSentinel sentinel, SessionContext context) : base(context)
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{
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this.logger = logger;
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this.sentinel = sentinel;
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}
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public override OperationResult Perform()
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{
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var success = true;
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StatusChanged?.Invoke(TextKey.OperationStatus_VerifySessionIntegrity);
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success &= InitializeStickyKeys();
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success &= VerifyCursors();
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success &= VerifyEaseOfAccess();
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LogResult(success);
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return success ? OperationResult.Success : OperationResult.Failed;
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}
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public override OperationResult Repeat()
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{
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var success = true;
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StatusChanged?.Invoke(TextKey.OperationStatus_VerifySessionIntegrity);
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success &= InitializeStickyKeys();
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success &= VerifyCursors();
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success &= VerifyEaseOfAccess();
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LogResult(success);
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return success ? OperationResult.Success : OperationResult.Failed;
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}
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public override OperationResult Revert()
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{
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FinalizeStickyKeys();
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return OperationResult.Success;
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}
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private void FinalizeStickyKeys()
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{
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sentinel.RevertStickyKeys();
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}
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private bool InitializeStickyKeys()
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{
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var success = true;
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sentinel.RevertStickyKeys();
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if (!Context.Next.Settings.Security.AllowStickyKeys)
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{
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success = sentinel.DisableStickyKeys();
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}
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return success;
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}
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private void LogResult(bool success)
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{
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if (success)
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{
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logger.Info("Successfully ensured session integrity.");
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}
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else
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{
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logger.Error("Failed to ensure session integrity! Aborting session initialization...");
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}
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}
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private bool VerifyCursors()
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{
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var success = true;
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if (Context.Next.Settings.Security.VerifyCursorConfiguration)
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{
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success = sentinel.VerifyCursors();
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}
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else
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{
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logger.Debug("Verification of cursor configuration is disabled.");
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}
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return success;
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}
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private bool VerifyEaseOfAccess()
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{
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var success = sentinel.VerifyEaseOfAccess();
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if (!success)
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{
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if (Context.Current?.Settings.Service.IgnoreService == false)
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{
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logger.Info($"Ease of access configuration is compromised but service was active in the current session.");
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success = true;
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}
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else if (!Context.Next.Settings.Service.IgnoreService)
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{
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logger.Info($"Ease of access configuration is compromised but service will be active in the next session.");
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success = true;
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}
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}
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return success;
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}
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}
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}
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