NTSTATUS NTAPI NtOpenProcessTokenEx	(	IN HANDLE	ProcessHandle,
		IN ACCESS_MASK	DesiredAccess,
		IN ULONG	HandleAttributes,
		OUT PHANDLE	TokenHandle
	)

Definition at line 344 of file security.c.

{
    PACCESS_TOKEN Token;
    HANDLE hToken;
    KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
    NTSTATUS Status;
    PAGED_CODE();
    PSTRACE(PS_SECURITY_DEBUG,
            "Process: %p DesiredAccess: %lx\n", ProcessHandle, DesiredAccess);

    /* Check if caller was user-mode */
    if (PreviousMode != KernelMode)
    {
        /* Enter SEH for probing */
        _SEH2_TRY
        {
            /* Probe the token handle */
            ProbeForWriteHandle(TokenHandle);
        }
        _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
        {
            /* Return the exception code */
            _SEH2_YIELD(return _SEH2_GetExceptionCode());
        }
        _SEH2_END;
    }

    /* Open the process token */
    Status = PsOpenTokenOfProcess(ProcessHandle, &Token);
    if (NT_SUCCESS(Status))
    {
        /* Reference it by handle and dereference the pointer */
        Status = ObOpenObjectByPointer(Token,
                                       HandleAttributes,
                                       NULL,
                                       DesiredAccess,
                                       SeTokenObjectType,
                                       PreviousMode,
                                       &hToken);
        ObDereferenceObject(Token);

        /* Make sure we got a handle */
        if (NT_SUCCESS(Status))
        {
            /* Enter SEH for write */
            _SEH2_TRY
            {
                /* Return the handle */
                *TokenHandle = hToken;
            }
            _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
            {
                /* Get exception code */
                Status = _SEH2_GetExceptionCode();
            }
            _SEH2_END;
        }
    }

    /* Return status */
    return Status;
}

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