/// <summary>
/// Gets the current user security identifier.
/// </summary>
/// <returns></returns>
internal static SecurityIdentifierSafePtr GetCurrentUserSid()
{
using ProcessTokenSafeHandle currentProcessHandle = Native.GetCurrentProcess();
if (!Native.OpenProcessToken(currentProcessHandle, Native.AccessRights.TokenQuery, out AccessTokenSafeHandle tokenHandle))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
using AccessTokenSafeHandle scopedTokenHandle = tokenHandle;
// Get the token user.
//
if (!Native.GetTokenInformation(tokenHandle, Native.TokenInformationClass.TokenUser, IntPtr.Zero, 0, out uint returnLength))
{
if (Marshal.GetLastWin32Error() != Native.ErrorInsufficientBuffer)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
using LocalAllocSafePtr tokenUserPtr = Native.LocalAlloc(Native.LocalMemoryFlags.Fixed | Native.LocalMemoryFlags.ZeroInit, returnLength);
if (tokenUserPtr.IsInvalid)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
if (!Native.GetTokenInformation(tokenHandle, Native.TokenInformationClass.TokenUser, tokenUserPtr.DangerousGetHandle(), returnLength, out returnLength))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
Native.TOKEN_USER tokenUser = Marshal.PtrToStructure <Native.TOKEN_USER>(tokenUserPtr.DangerousGetHandle());
uint userSidLength = Native.GetLengthSid(tokenUser.User.Sid);
SecurityIdentifierSafePtr currentUserSidPtr = Native.AllocSecurityIdentifier(Native.LocalMemoryFlags.Fixed | Native.LocalMemoryFlags.ZeroInit, userSidLength);
if (currentUserSidPtr.IsInvalid)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
if (!Native.CopySid(userSidLength, currentUserSidPtr, tokenUser.User.Sid))
{
currentUserSidPtr.Dispose();
throw new Win32Exception(Marshal.GetLastWin32Error());
}
return(currentUserSidPtr);
}
public static extern bool OpenProcessToken(
ProcessTokenSafeHandle processHandle,
AccessRights desiredAccess,
out AccessTokenSafeHandle tokenHandle);
