Run a command as another user. If the process is running as an admin or
    system account this method does not require a password. Other non
    privileged accounts need to provide a password for the user to runas.
    Commands are run in with the highest level privileges possible for the
    account provided.

def runas(cmdLine, username, password=None, cwd=None):
    '''
    Run a command as another user. If the process is running as an admin or
    system account this method does not require a password. Other non
    privileged accounts need to provide a password for the user to runas.
    Commands are run in with the highest level privileges possible for the
    account provided.
    '''

    # Elevate the token from the current process
    access = (
        win32security.TOKEN_QUERY |
        win32security.TOKEN_ADJUST_PRIVILEGES
    )
    th = win32security.OpenProcessToken(win32api.GetCurrentProcess(), access)
    salt.platform.win.elevate_token(th)

    # Try to impersonate the SYSTEM user. This process needs to be running as a
    # user who as been granted the SeImpersonatePrivilege, Administrator
    # accounts have this permission by default.
    try:
        impersonation_token = salt.platform.win.impersonate_sid(
            salt.platform.win.SYSTEM_SID,
            session_id=0,
            privs=['SeTcbPrivilege'],
        )
    except WindowsError:  # pylint: disable=undefined-variable
        log.debug("Unable to impersonate SYSTEM user")
        impersonation_token = None

    # Impersonation of the SYSTEM user failed. Fallback to an un-privileged
    # runas.
    if not impersonation_token:
        log.debug("No impersonation token, using unprivileged runas")
        return runas_unpriv(cmdLine, username, password, cwd)

    username, domain = split_username(username)
    # Validate the domain and sid exist for the username
    try:
        _, domain, _ = win32security.LookupAccountName(domain, username)
    except pywintypes.error as exc:
        message = win32api.FormatMessage(exc.winerror).rstrip('\n')
        raise CommandExecutionError(message)

    if domain == 'NT AUTHORITY':
        # Logon as a system level account, SYSTEM, LOCAL SERVICE, or NETWORK
        # SERVICE.
        logonType = win32con.LOGON32_LOGON_SERVICE
        user_token = win32security.LogonUser(
            username,
            domain,
            '',
            win32con.LOGON32_LOGON_SERVICE,
            win32con.LOGON32_PROVIDER_DEFAULT,
        )
    elif password:
        # Login with a password.
        user_token = win32security.LogonUser(
            username,
            domain,
            password,
            win32con.LOGON32_LOGON_INTERACTIVE,
            win32con.LOGON32_PROVIDER_DEFAULT,
        )
    else:
        # Login without a password. This always returns an elevated token.
        user_token = salt.platform.win.logon_msv1_s4u(username).Token

    # Get a linked user token to elevate if needed
    elevation_type = win32security.GetTokenInformation(
        user_token, win32security.TokenElevationType
    )
    if elevation_type > 1:
        user_token = win32security.GetTokenInformation(
            user_token,
            win32security.TokenLinkedToken
        )

    # Elevate the user token
    salt.platform.win.elevate_token(user_token)

    # Make sure the user's token has access to a windows station and desktop
    salt.platform.win.grant_winsta_and_desktop(user_token)

    # Create pipes for standard in, out and error streams
    security_attributes = win32security.SECURITY_ATTRIBUTES()
    security_attributes.bInheritHandle = 1

    stdin_read, stdin_write = win32pipe.CreatePipe(security_attributes, 0)
    stdin_read = salt.platform.win.make_inheritable(stdin_read)

    stdout_read, stdout_write = win32pipe.CreatePipe(security_attributes, 0)
    stdout_write = salt.platform.win.make_inheritable(stdout_write)

    stderr_read, stderr_write = win32pipe.CreatePipe(security_attributes, 0)
    stderr_write = salt.platform.win.make_inheritable(stderr_write)

    # Run the process without showing a window.
    creationflags = (
        win32process.CREATE_NO_WINDOW |
        win32process.CREATE_NEW_CONSOLE |
        win32process.CREATE_SUSPENDED
    )

    startup_info = salt.platform.win.STARTUPINFO(
        dwFlags=win32con.STARTF_USESTDHANDLES,
        hStdInput=stdin_read.handle,
        hStdOutput=stdout_write.handle,
        hStdError=stderr_write.handle,
    )

    # Create the environment for the user
    env = win32profile.CreateEnvironmentBlock(user_token, False)

    # Start the process in a suspended state.
    process_info = salt.platform.win.CreateProcessWithTokenW(
        int(user_token),
        logonflags=1,
        applicationname=None,
        commandline=cmdLine,
        currentdirectory=cwd,
        creationflags=creationflags,
        startupinfo=startup_info,
        environment=env,
    )

    hProcess = process_info.hProcess
    hThread = process_info.hThread
    dwProcessId = process_info.dwProcessId
    dwThreadId = process_info.dwThreadId

    salt.platform.win.kernel32.CloseHandle(stdin_write.handle)
    salt.platform.win.kernel32.CloseHandle(stdout_write.handle)
    salt.platform.win.kernel32.CloseHandle(stderr_write.handle)

    ret = {'pid': dwProcessId}
    # Resume the process
    psutil.Process(dwProcessId).resume()

    # Wait for the process to exit and get it's return code.
    if win32event.WaitForSingleObject(hProcess, win32event.INFINITE) == win32con.WAIT_OBJECT_0:
        exitcode = win32process.GetExitCodeProcess(hProcess)
        ret['retcode'] = exitcode

    # Read standard out
    fd_out = msvcrt.open_osfhandle(stdout_read.handle, os.O_RDONLY | os.O_TEXT)
    with os.fdopen(fd_out, 'r') as f_out:
        stdout = f_out.read()
        ret['stdout'] = stdout

    # Read standard error
    fd_err = msvcrt.open_osfhandle(stderr_read.handle, os.O_RDONLY | os.O_TEXT)
    with os.fdopen(fd_err, 'r') as f_err:
        stderr = f_err.read()
        ret['stderr'] = stderr

    salt.platform.win.kernel32.CloseHandle(hProcess)
    win32api.CloseHandle(user_token)
    if impersonation_token:
        win32security.RevertToSelf()
    win32api.CloseHandle(impersonation_token)

    return ret