Merge pull request #6 from diegoara96/master

Virtualized MAC and PCI vendor detection

SafeExamBrowser.SystemComponents.Contracts/ISystemInfo.cs

@@ -42,5 +42,15 @@ namespace SafeExamBrowser.SystemComponents.Contracts
 		/// Provides detailed version information about the currently running operating system.
 		/// </summary>
 		string OperatingSystemInfo { get; }
+
+		/// <summary>
+		/// The MAC address of the network adapter
+		/// </summary>
+		string MacAddress { get; }
+
+		/// <summary>
+		/// Provides the DeviceID information of the user's Plug and Play devices 
+		/// </summary>
+		string[] PlugAndPlayDeviceIds { get; }
 	}
 }

SafeExamBrowser.SystemComponents/SystemInfo.cs

@@ -7,6 +7,7 @@
  */
 
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Management;
 using System.Windows.Forms;
@@ -23,6 +24,8 @@ namespace SafeExamBrowser.SystemComponents
 		public string Model { get; private set; }
 		public string Name { get; private set; }
 		public OperatingSystem OperatingSystem { get; private set; }
+		public string MacAddress { get; private set; }
+		public string[] PlugAndPlayDeviceIds { get; private set; }
 
 		public string OperatingSystemInfo
 		{
@@ -34,6 +37,8 @@ namespace SafeExamBrowser.SystemComponents
 			InitializeBattery();
 			InitializeMachineInfo();
 			InitializeOperatingSystem();
+			InitializeMacAddress();
+			InitializePnPDevices();
 		}
 
 		private void InitializeBattery()
@@ -128,5 +133,56 @@ namespace SafeExamBrowser.SystemComponents
 		{
 			return Environment.Is64BitOperatingSystem ? "x64" : "x86";
 		}
+
+		private void InitializeMacAddress()
+		{
+			using (var searcher = new ManagementObjectSearcher("Select MACAddress from Win32_NetworkAdapterConfiguration WHERE DNSDomain IS NOT NULL"))
+			using (var results = searcher.Get())
+			{
+				
+				if (results != null && results.Count > 0)
+				{
+					using (var networkAdapter = results.Cast<ManagementObject>().First())
+					{
+						foreach (var property in networkAdapter.Properties)
+						{
+
+							if (property.Name.Equals("MACAddress"))
+							{
+								MacAddress = Convert.ToString(property.Value).Replace(":", "").ToUpper();
+							}
+						}
+					}
+				}
+				else
+				{
+					MacAddress = "000000000000";
+				}
+			}
+		}
+
+		private void InitializePnPDevices()
+		{
+			var deviceList = new List<string>();
+			using (var searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT DeviceID FROM Win32_PnPEntity"))
+			using (var results = searcher.Get())
+			{
+				foreach (ManagementObject queryObj in results)
+				{
+					using (queryObj) 
+					{ 
+						foreach (var property in queryObj.Properties)
+						{
+							if (property.Name.Equals("DeviceID"))
+							{
+								deviceList.Add(Convert.ToString(property.Value).ToLower());
+							}
+						}
+					}
+				}
+				PlugAndPlayDeviceIds = deviceList.ToArray();
+
+			}
+		}
 	}
 }

SafeExamBrowser.SystemComponents/VirtualMachineDetector.cs

@@ -8,11 +8,15 @@
 
 using SafeExamBrowser.Logging.Contracts;
 using SafeExamBrowser.SystemComponents.Contracts;
+using System.Globalization;
+using System.Linq;
 
 namespace SafeExamBrowser.SystemComponents
 {
 	public class VirtualMachineDetector : IVirtualMachineDetector
 	{
+		private static readonly string[] PCI_VENDOR_BLACKLIST = { "vbox", "80ee", "qemu", "1af4", "1b36" }; //Virtualbox: VBOX, 80EE   RedHat: QUEMU, 1AF4, 1B36
+
 		private ILogger logger;
 		private ISystemInfo systemInfo;
 		
@@ -27,6 +31,8 @@ namespace SafeExamBrowser.SystemComponents
 			var isVirtualMachine = false;
 			var manufacturer = systemInfo.Manufacturer.ToLower();
 			var model = systemInfo.Model.ToLower();
+			var macAddress = systemInfo.MacAddress;
+			var plugAndPlayDeviceIds = systemInfo.PlugAndPlayDeviceIds;
 
 			isVirtualMachine |= manufacturer.Contains("microsoft corporation") && !model.Contains("surface");
 			isVirtualMachine |= manufacturer.Contains("vmware");
@@ -34,6 +40,17 @@ namespace SafeExamBrowser.SystemComponents
 			isVirtualMachine |= model.Contains("virtualbox");
 			isVirtualMachine |= manufacturer.Contains("qemu");
 
+			if (macAddress != null && macAddress.Count() > 2)
+			{
+				isVirtualMachine |= ((byte.Parse(macAddress[1].ToString(), NumberStyles.HexNumber) & 2) == 2 || macAddress.StartsWith("080027"));
+			}
+
+			foreach (var device in plugAndPlayDeviceIds)
+			{
+				isVirtualMachine |= PCI_VENDOR_BLACKLIST.Any(device.ToLower().Contains);
+
+			}
+
 			logger.Debug($"Computer '{systemInfo.Name}' appears to {(isVirtualMachine ? "" : "not ")}be a virtual machine.");
 
 			return isVirtualMachine;