65 lines
2.3 KiB
C#
65 lines
2.3 KiB
C#
/*
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* Copyright (c) 2022 ETH Zürich, Educational Development and Technology (LET)
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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.Linq;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.SystemComponents.Contracts;
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namespace SafeExamBrowser.SystemComponents
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{
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public class VirtualMachineDetector : IVirtualMachineDetector
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{
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/// <summary>
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/// Virtualbox: VBOX, 80EE / RedHat: QUEMU, 1AF4, 1B36
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/// </summary>
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private static readonly string[] PCI_VENDOR_BLACKLIST = { "vbox", "vid_80ee", "qemu", "ven_1af4", "ven_1b36", "subsys_11001af4" };
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private static readonly string QEMU_MAC_PREFIX = "525400";
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private static readonly string VIRTUALBOX_MAC_PREFIX = "080027";
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private readonly ILogger logger;
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private readonly ISystemInfo systemInfo;
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public VirtualMachineDetector(ILogger logger, ISystemInfo systemInfo)
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{
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this.logger = logger;
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this.systemInfo = systemInfo;
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}
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public bool IsVirtualMachine()
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{
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var biosInfo = systemInfo.BiosInfo.ToLower();
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var isVirtualMachine = false;
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var macAddress = systemInfo.MacAddress;
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var manufacturer = systemInfo.Manufacturer.ToLower();
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var model = systemInfo.Model.ToLower();
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var plugAndPlayDeviceIds = systemInfo.PlugAndPlayDeviceIds;
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isVirtualMachine |= biosInfo.Contains("vmware");
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isVirtualMachine |= biosInfo.Contains("virtualbox");
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isVirtualMachine |= manufacturer.Contains("microsoft corporation") && !model.Contains("surface");
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isVirtualMachine |= manufacturer.Contains("vmware");
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isVirtualMachine |= manufacturer.Contains("parallels software");
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isVirtualMachine |= model.Contains("virtualbox");
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isVirtualMachine |= manufacturer.Contains("qemu");
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if (macAddress != null && macAddress.Count() > 2)
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{
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isVirtualMachine |= macAddress.StartsWith(QEMU_MAC_PREFIX) || macAddress.StartsWith(VIRTUALBOX_MAC_PREFIX);
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}
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foreach (var device in plugAndPlayDeviceIds)
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{
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isVirtualMachine |= PCI_VENDOR_BLACKLIST.Any(device.ToLower().Contains);
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}
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logger.Debug($"Computer '{systemInfo.Name}' appears {(isVirtualMachine ? "" : "not ")}to be a virtual machine.");
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return isVirtualMachine;
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}
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}
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}
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