private static int ExecRequireNonAdmin(IWin32Window parent, string exePath, string args, out IntPtr hProcess)
{
int nError = NativeConstants.ERROR_SUCCESS;
string commandLine = "\"" + exePath + "\"" + (args == null ? "" : (" " + args));
string dir;
try
{
dir = Path.GetDirectoryName(exePath);
}
catch (Exception)
{
dir = null;
}
IntPtr hWndShell = IntPtr.Zero;
IntPtr hShellProcess = IntPtr.Zero;
IntPtr hShellProcessToken = IntPtr.Zero;
IntPtr hTokenCopy = IntPtr.Zero;
IntPtr bstrExePath = IntPtr.Zero;
IntPtr bstrCommandLine = IntPtr.Zero;
IntPtr bstrDir = IntPtr.Zero;
NativeStructs.PROCESS_INFORMATION procInfo = new NativeStructs.PROCESS_INFORMATION();
try
{
hWndShell = SafeNativeMethods.FindWindowW("Progman", null);
if (hWndShell == IntPtr.Zero)
{
NativeMethods.ThrowOnWin32Error("FindWindowW() returned NULL");
}
uint dwPID;
uint dwThreadId = SafeNativeMethods.GetWindowThreadProcessId(hWndShell, out dwPID);
if (0 == dwPID)
{
NativeMethods.ThrowOnWin32Error("GetWindowThreadProcessId returned 0", NativeErrors.ERROR_FILE_NOT_FOUND);
}
hShellProcess = NativeMethods.OpenProcess(NativeConstants.PROCESS_QUERY_INFORMATION, false, dwPID);
if (IntPtr.Zero == hShellProcess)
{
NativeMethods.ThrowOnWin32Error("OpenProcess() returned NULL");
}
bool optResult = NativeMethods.OpenProcessToken(
hShellProcess,
NativeConstants.TOKEN_ASSIGN_PRIMARY | NativeConstants.TOKEN_DUPLICATE | NativeConstants.TOKEN_QUERY,
out hShellProcessToken);
if (!optResult)
{
NativeMethods.ThrowOnWin32Error("OpenProcessToken() returned FALSE");
}
bool dteResult = NativeMethods.DuplicateTokenEx(
hShellProcessToken,
NativeConstants.MAXIMUM_ALLOWED,
IntPtr.Zero,
NativeConstants.SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation,
NativeConstants.TOKEN_TYPE.TokenPrimary,
out hTokenCopy);
if (!dteResult)
{
NativeMethods.ThrowOnWin32Error("DuplicateTokenEx() returned FALSE");
}
bstrExePath = Marshal.StringToBSTR(exePath);
bstrCommandLine = Marshal.StringToBSTR(commandLine);
bstrDir = Marshal.StringToBSTR(dir);
bool cpwtResult = NativeMethods.CreateProcessWithTokenW(
hTokenCopy,
0,
bstrExePath,
bstrCommandLine,
0,
IntPtr.Zero,
bstrDir,
IntPtr.Zero,
out procInfo);
if (cpwtResult)
{
hProcess = procInfo.hProcess;
procInfo.hProcess = IntPtr.Zero;
nError = NativeConstants.ERROR_SUCCESS;
}
else
{
hProcess = IntPtr.Zero;
nError = Marshal.GetLastWin32Error();
}
}
catch (Win32Exception ex)
{
Tracing.Ping(ex.ToString());
nError = ex.ErrorCode;
hProcess = IntPtr.Zero;
}
finally
{
if (bstrExePath != IntPtr.Zero)
{
Marshal.FreeBSTR(bstrExePath);
bstrExePath = IntPtr.Zero;
}
if (bstrCommandLine != IntPtr.Zero)
{
Marshal.FreeBSTR(bstrCommandLine);
bstrCommandLine = IntPtr.Zero;
}
if (bstrDir != IntPtr.Zero)
{
Marshal.FreeBSTR(bstrDir);
bstrDir = IntPtr.Zero;
}
if (hShellProcess != IntPtr.Zero)
{
SafeNativeMethods.CloseHandle(hShellProcess);
hShellProcess = IntPtr.Zero;
}
if (hShellProcessToken != IntPtr.Zero)
{
SafeNativeMethods.CloseHandle(hShellProcessToken);
hShellProcessToken = IntPtr.Zero;
}
if (hTokenCopy != IntPtr.Zero)
{
SafeNativeMethods.CloseHandle(hTokenCopy);
hTokenCopy = IntPtr.Zero;
}
if (procInfo.hThread != IntPtr.Zero)
{
SafeNativeMethods.CloseHandle(procInfo.hThread);
procInfo.hThread = IntPtr.Zero;
}
if (procInfo.hProcess != IntPtr.Zero)
{
SafeNativeMethods.CloseHandle(procInfo.hProcess);
procInfo.hProcess = IntPtr.Zero;
}
}
return(nError);
}