95 lines
2.6 KiB
C#
95 lines
2.6 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 System.Threading.Tasks;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.Monitoring.Contracts.System.Events;
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using SafeExamBrowser.SystemComponents.Contracts.Registry;
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namespace SafeExamBrowser.Monitoring.System.Components
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{
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internal class EaseOfAccess
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{
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private readonly ILogger logger;
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private readonly IRegistry registry;
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internal event SentinelEventHandler EaseOfAccessChanged;
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internal EaseOfAccess(ILogger logger, IRegistry registry)
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{
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this.logger = logger;
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this.registry = registry;
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}
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internal void StartMonitoring()
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{
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registry.ValueChanged += Registry_ValueChanged;
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registry.StartMonitoring(RegistryValue.MachineHive.EaseOfAccess_Key, RegistryValue.MachineHive.EaseOfAccess_Name);
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logger.Info("Started monitoring ease of access.");
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}
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internal void StopMonitoring()
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{
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registry.ValueChanged -= Registry_ValueChanged;
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registry.StopMonitoring(RegistryValue.MachineHive.EaseOfAccess_Key, RegistryValue.MachineHive.EaseOfAccess_Name);
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logger.Info("Stopped monitoring ease of access.");
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}
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internal bool Verify()
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{
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logger.Info($"Starting ease of access verification...");
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var success = registry.TryRead(RegistryValue.MachineHive.EaseOfAccess_Key, RegistryValue.MachineHive.EaseOfAccess_Name, out var value);
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if (success)
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{
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if (value is string s && string.IsNullOrWhiteSpace(s))
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{
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logger.Info("Ease of access configuration successfully verified.");
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}
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else
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{
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logger.Warn($"Ease of access configuration is compromised: '{value}'!");
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success = false;
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}
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}
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else
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{
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success = true;
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logger.Info("Ease of access configuration successfully verified (value does not exist).");
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}
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return success;
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}
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private void Registry_ValueChanged(string key, string name, object oldValue, object newValue)
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{
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if (key == RegistryValue.MachineHive.EaseOfAccess_Key)
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{
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HandleEaseOfAccessChange(key, name, oldValue, newValue);
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}
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}
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private void HandleEaseOfAccessChange(string key, string name, object oldValue, object newValue)
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{
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var args = new SentinelEventArgs();
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logger.Warn($@"The ease of access registry value '{key}\{name}' has changed from '{oldValue}' to '{newValue}'!");
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Task.Run(() => EaseOfAccessChanged?.Invoke(args)).ContinueWith((_) =>
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{
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if (args.Allow)
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{
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registry.StopMonitoring(key, name);
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}
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});
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}
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}
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}
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