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using System.ComponentModel;
using System.Security;
using System.Security.Permissions;
using System.Security.Principal;
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles;
namespace System
{
internal static class EnvironmentHelpers
{
private static volatile bool s_IsAppContainerProcess;
private static volatile bool s_IsAppContainerProcessInitalized;
public static bool IsAppContainerProcess {
get {
if(!s_IsAppContainerProcessInitalized) {
if(Environment.OSVersion.Platform != PlatformID.Win32NT) {
s_IsAppContainerProcess = false;
} else if(Environment.OSVersion.Version.Major < 6 || (Environment.OSVersion.Version.Major == 6 && Environment.OSVersion.Version.Minor <= 1)) {
// Windows 7 or older.
s_IsAppContainerProcess = false;
} else {
s_IsAppContainerProcess = HasAppContainerToken();
}
s_IsAppContainerProcessInitalized = true;
}
return s_IsAppContainerProcess;
}
}
[SecuritySafeCritical]
[SecurityPermission(SecurityAction.Assert, Flags = SecurityPermissionFlag.UnmanagedCode | SecurityPermissionFlag.ControlPrincipal)]
private static unsafe bool HasAppContainerToken() {
int* dwIsAppContainerPtr = stackalloc int[1];
uint dwLength = 0;
using (WindowsIdentity wi = WindowsIdentity.GetCurrent(TokenAccessLevels.Query)) {
if (!UnsafeNativeMethods.GetTokenInformation(wi.Token, UnsafeNativeMethods.TokenIsAppContainer, new IntPtr(dwIsAppContainerPtr), sizeof(int), out dwLength)) {
throw new Win32Exception();
}
}
return (*dwIsAppContainerPtr != 0);
}
internal static bool IsWindowsVistaOrAbove()
{
// Method should match the logic of the internal Environment.IsWindowsVista property in mscorlib
// If this method turns out to be heavily used we might want to cache at least part of this value.
OperatingSystem os = Environment.OSVersion;
return os.Platform == PlatformID.Win32NT && os.Version.Major >= 6;
}
}
}
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