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SEBWIN-577: Implemented detection of BIOS manufacturer & name.

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This commit is contained in:
Damian Büchel 2022-07-29 13:49:26 +02:00
parent a7bb5f543a
commit 20357c8e75
3 changed files with 96 additions and 44 deletions
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17
SafeExamBrowser.SystemComponents.Contracts/ISystemInfo.cs
View file

@ -13,11 +13,21 @@ namespace SafeExamBrowser.SystemComponents.Contracts
/// </summary>
public interface ISystemInfo
{
/// <summary>
/// The manufacturer and name of the BIOS.
/// </summary>
string BiosInfo { get; }
/// <summary>
/// Reveals whether the computer system contains a battery.
/// </summary>
bool HasBattery { get; }
/// <summary>
/// The MAC address of the network adapter.
/// </summary>
string MacAddress { get; }
/// <summary>
/// The manufacturer name of the computer system.
/// </summary>
@ -44,12 +54,7 @@ namespace SafeExamBrowser.SystemComponents.Contracts
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
/// Provides the device ID information of the user's Plug and Play devices.
/// </summary>
string[] PlugAndPlayDeviceIds { get; }
}

105
SafeExamBrowser.SystemComponents/SystemInfo.cs
View file

@ -19,25 +19,23 @@ namespace SafeExamBrowser.SystemComponents
{
public class SystemInfo : ISystemInfo
{
public string BiosInfo { get; private set; }
public bool HasBattery { get; private set; }
public string MacAddress { get; private set; }
public string Manufacturer { get; private set; }
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 OperatingSystemInfo => $"{OperatingSystemName()}, {Environment.OSVersion.VersionString} ({Architecture()})";
public string[] PlugAndPlayDeviceIds { get; private set; }
public string OperatingSystemInfo
{
get { return $"{OperatingSystemName()}, {Environment.OSVersion.VersionString} ({Architecture()})"; }
}
public SystemInfo()
{
InitializeBattery();
InitializeBiosInfo();
InitializeMacAddress();
InitializeMachineInfo();
InitializeOperatingSystem();
InitializeMacAddress();
InitializePnPDevices();
}
@ -45,7 +43,40 @@ namespace SafeExamBrowser.SystemComponents
{
var status = SystemInformation.PowerStatus.BatteryChargeStatus;
HasBattery = !status.HasFlag(BatteryChargeStatus.NoSystemBattery) && !status.HasFlag(BatteryChargeStatus.Unknown);
HasBattery = !status.HasFlag(BatteryChargeStatus.NoSystemBattery);
HasBattery &= !status.HasFlag(BatteryChargeStatus.Unknown);
}
private void InitializeBiosInfo()
{
var manufacturer = default(string);
var name = default(string);
try
{
using (var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS"))
using (var results = searcher.Get())
using (var bios = results.Cast<ManagementObject>().First())
{
foreach (var property in bios.Properties)
{
if (property.Name.Equals("Manufacturer"))
{
manufacturer = Convert.ToString(property.Value);
}
else if (property.Name.Equals("Name"))
{
name = Convert.ToString(property.Value);
}
}
}
BiosInfo = $"{manufacturer} {name}";
}
catch (Exception)
{
BiosInfo = "";
}
}
private void InitializeMachineInfo()
@ -80,7 +111,7 @@ namespace SafeExamBrowser.SystemComponents
}
}
Model = string.Join(" ", systemFamily, model);
Model = $"{systemFamily} {model}";
}
catch (Exception)
{
@ -93,8 +124,8 @@ namespace SafeExamBrowser.SystemComponents
private void InitializeOperatingSystem()
{
// IMPORTANT:
// In order to be able to retrieve the correct operating system version via System.Environment.OSVersion, the executing
// assembly needs to define an application manifest where the supported Windows versions are specified!
// In order to be able to retrieve the correct operating system version via System.Environment.OSVersion,
// the executing assembly needs to define an application manifest specifying all supported Windows versions!
var major = Environment.OSVersion.Version.Major;
var minor = Environment.OSVersion.Version.Minor;
var build = Environment.OSVersion.Version.Build;
@ -154,26 +185,35 @@ namespace SafeExamBrowser.SystemComponents
private void InitializeMacAddress()
{
using (var searcher = new ManagementObjectSearcher("SELECT MACAddress FROM Win32_NetworkAdapterConfiguration WHERE DNSDomain IS NOT NULL"))
using (var results = searcher.Get())
const string UNDEFINED = "000000000000";
try
{
if (results != null && results.Count > 0)
using (var searcher = new ManagementObjectSearcher("SELECT MACAddress FROM Win32_NetworkAdapterConfiguration WHERE DNSDomain IS NOT NULL"))
using (var results = searcher.Get())
{
using (var networkAdapter = results.Cast<ManagementObject>().First())
if (results != null && results.Count > 0)
{
foreach (var property in networkAdapter.Properties)
using (var networkAdapter = results.Cast<ManagementObject>().First())
{
if (property.Name.Equals("MACAddress"))
foreach (var property in networkAdapter.Properties)
{
MacAddress = Convert.ToString(property.Value).Replace(":", "").ToUpper();
if (property.Name.Equals("MACAddress"))
{
MacAddress = Convert.ToString(property.Value).Replace(":", "").ToUpper();
}
}
}
}
else
{
MacAddress = UNDEFINED;
}
}
else
{
MacAddress = "000000000000";
}
}
catch (Exception)
{
MacAddress = UNDEFINED;
}
}
@ -181,23 +221,28 @@ namespace SafeExamBrowser.SystemComponents
{
var deviceList = new List<string>();
using (var searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT DeviceID FROM Win32_PnPEntity"))
using (var results = searcher.Get())
try
{
foreach (ManagementObject queryObj in results)
using (var searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT DeviceID FROM Win32_PnPEntity"))
using (var results = searcher.Get())
{
using (queryObj)
foreach (ManagementObject queryObj in results)
{
foreach (var property in queryObj.Properties)
using (queryObj)
{
if (property.Name.Equals("DeviceID"))
foreach (var property in queryObj.Properties)
{
deviceList.Add(Convert.ToString(property.Value).ToLower());
if (property.Name.Equals("DeviceID"))
{
deviceList.Add(Convert.ToString(property.Value).ToLower());
}
}
}
}
}
}
finally
{
PlugAndPlayDeviceIds = deviceList.ToArray();
}
}

16
SafeExamBrowser.SystemComponents/VirtualMachineDetector.cs
View file

@ -15,15 +15,14 @@ namespace SafeExamBrowser.SystemComponents
public class VirtualMachineDetector : IVirtualMachineDetector
{
/// <summary>
/// Virtualbox: VBOX, 80EE
/// RedHat: QUEMU, 1AF4, 1B36
/// Virtualbox: VBOX, 80EE / RedHat: QUEMU, 1AF4, 1B36
/// </summary>
private static readonly string[] PCI_VENDOR_BLACKLIST = { "vbox", "vid_80ee", "qemu", "ven_1af4", "ven_1b36", "subsys_11001af4" };
private static readonly string VIRTUALBOX_MAC_PREFIX = "080027";
private static readonly string QEMU_MAC_PREFIX = "525400";
private static readonly string VIRTUALBOX_MAC_PREFIX = "080027";
private ILogger logger;
private ISystemInfo systemInfo;
private readonly ILogger logger;
private readonly ISystemInfo systemInfo;
public VirtualMachineDetector(ILogger logger, ISystemInfo systemInfo)
{
@ -33,12 +32,15 @@ namespace SafeExamBrowser.SystemComponents
public bool IsVirtualMachine()
{
var biosInfo = systemInfo.BiosInfo.ToLower();
var isVirtualMachine = false;
var macAddress = systemInfo.MacAddress;
var manufacturer = systemInfo.Manufacturer.ToLower();
var model = systemInfo.Model.ToLower();
var macAddress = systemInfo.MacAddress;
var plugAndPlayDeviceIds = systemInfo.PlugAndPlayDeviceIds;
isVirtualMachine |= biosInfo.Contains("vmware");
isVirtualMachine |= biosInfo.Contains("virtualbox");
isVirtualMachine |= manufacturer.Contains("microsoft corporation") && !model.Contains("surface");
isVirtualMachine |= manufacturer.Contains("vmware");
isVirtualMachine |= manufacturer.Contains("parallels software");
@ -55,7 +57,7 @@ namespace SafeExamBrowser.SystemComponents
isVirtualMachine |= PCI_VENDOR_BLACKLIST.Any(device.ToLower().Contains);
}
logger.Debug($"Computer '{systemInfo.Name}' appears to {(isVirtualMachine ? "" : "not ")}be a virtual machine.");
logger.Debug($"Computer '{systemInfo.Name}' appears {(isVirtualMachine ? "" : "not ")}to be a virtual machine.");
return isVirtualMachine;
}