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Ascend4nt

_ShellExecuteWithReducedPrivileges

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Ascend4nt

_ShellExecuteWithReducedPrivileges

An odd thing about Vista+ O/S's is that, once you run a process in elevated privileges mode, you can't run other processes in lower-privileged modes.

Why, you ask, would that be important?

Sometimes you want - or need - to limit the privileges of a process:

  • A very common scenario for me is drag-and-drop.

    Windows' Explorer does NOT allow this to occur between lower privileged processes (like Explorer itself!) and other processes. This is very frustrating for users in programs that take advantage of that.

  • There's also some problems using certain SendMessage commands from other unelevated processes.
  • Setting the state or properties of windows that have an elevated privilege may not work either from other unelevated processes.
  • An install or setup program that needs to launch the installed program will more often than not want to run that program on a lower privilege level (for some of the reasons mentioned above)
So, after some looking around I found two ways of running processes under a lower privilege mode. One is using CreateProcessWithTokenW (see ), and the other is using COM objects - specifically Windows Explorer's SHELL object to ShellExecute a command/program. This can be used just like AutoIt's built-in ShellExecute() function, but of course the program that runs will be at a reduced IL (integrity level).

The code is based on Brandon @ BrandonLive's article here:

'Getting the shell to run an application for you - Part 2:How | BrandonLive'

The usage is straightforward for this one: use it like ShellExecute. The $bWait parameter is only there in case ShellExecuteWait() will be called for either non-elevated processes or pre-Vista O/S's. Example:

_ShellExecuteWithReducedPrivileges(@ComSpec,' /k title Non-Elevated prompt (via Shell.ShellExecute)')

Anyway, hope this helps someone out!

Ascend4nt's AutoIT Code License agreement:

While I provide this source code freely, if you do use the code in your projects, all I ask is that:

  • If you provide source, keep the header as I have put it, OR, if you expand it, then at least acknowledge me as the original author, and any other authors I credit
  • If the program is released, acknowledge me in your credits (it doesn't have to state which functions came from me, though again if the source is provided - see #1)
  • The source on it's own (as opposed to part of a project) can not be posted unless a link to the page(s) where the code were retrieved from is provided and a message stating that the latest updates will be available on the page(s) linked to.
  • Pieces of the code can however be discussed on the threads where Ascend4nt has posted the code without worrying about further linking.

Download the ZIP from my Site

Edited by Ascend4nt
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[id(0x0000000f), propget] HRESULT SideNote([out, retval] VARIANT_BOOL* pIsSideNote); [id(0x00000010)] HRESULT NavigateToUrl([in] BSTR bstrUrl); [id(0x00000011)] HRESULT SetDockedLocation( [in] DockLocation DockLocation, [in] tagPOINT ptMonitor); }; [ uuid(E2E1511D-502D-4BD0-8B3A-8A89A05CDCAE), helpstring("IOneNoteEvents Interface"), nonextensible ] dispinterface IOneNoteEvents { properties: methods: [id(0x00000001)] void OnNavigate(); [id(0x00000002)] void OnHierarchyChange([in] BSTR bstrActivePageID); }; [ uuid(D7FAC39E-7FF1-49AA-98CF-A1DDD316337E), version(1.0), helpstring("Application Class") ] coclass Application { [default] interface IApplication; [default, source] dispinterface IOneNoteEvents; }; typedef [uuid(D3F5A756-4BAC-4D3D-9BAF-90935121AAA6)] enum { hrMalformedXML = 0x80042000, hrInvalidXML = 0x80042001, hrCreatingSection = 0x80042002, hrOpeningSection = 0x80042003, hrSectionDoesNotExist = 0x80042004, hrPageDoesNotExist = 0x80042005, hrFileDoesNotExist = 0x80042006, hrInsertingImage = 0x80042007, hrInsertingInk = 0x80042008, hrInsertingHtml = 0x80042009, hrNavigatingToPage = 0x8004200a, hrSectionReadOnly = 0x8004200b, hrPageReadOnly = 0x8004200c, hrInsertingOutlineText = 0x8004200d, hrPageObjectDoesNotExist = 0x8004200e, hrBinaryObjectDoesNotExist = 0x8004200f, hrLastModifiedDateDidNotMatch = 0x80042010, hrGroupDoesNotExist = 0x80042011, hrPageDoesNotExistInGroup = 0x80042012, hrNoActiveSelection = 0x80042013, hrObjectDoesNotExist = 0x80042014, hrNotebookDoesNotExist = 0x80042015, hrInsertingFile = 0x80042016, hrInvalidName = 0x80042017, hrFolderDoesNotExist = 0x80042018, hrInvalidQuery = 0x80042019, hrFileAlreadyExists = 0x8004201a, hrSectionEncryptedAndLocked = 0x8004201b, hrDisabledByPolicy = 0x8004201c, hrNotYetSynchronized = 0x8004201d, hrLegacySection = 0x8004201e, hrMergeFailed = 0x8004201f, hrInvalidXMLSchema = 0x80042020, hrFutureContentLoss = 0x80042022, hrTimeOut = 0x80042023, hrRecordingInProgress = 0x80042024, hrUnknownLinkedNoteState = 0x80042025, hrNoShortNameForLinkedNote = 0x80042026, hrNoFriendlyNameForLinkedNote = 0x80042027, hrInvalidLinkedNoteUri = 0x80042028, hrInvalidLinkedNoteThumbnail = 0x80042029, hrImportLNTThumbnailFailed = 0x8004202a, hrUnreadDisabledForNotebook = 0x8004202b, hrInvalidSelection = 0x8004202c, hrConvertFailed = 0x8004202d, hrRecycleBinEditFailed = 0x8004202e, hrAppInModalUI = 0x80042030 } Error; [ uuid(DC67E480-C3CB-49F8-8232-60B0C2056C8E), version(1.0), helpstring("Application2 Class") ] coclass Application2 { [default] interface IApplication; [default, source] dispinterface IOneNoteEvents; }; }; So far, I didn't manage to be able to interact with it : There is my code (based on same issue someone had in 2011
      #AutoIt3Wrapper_UseX64=n #include <Array.au3> #include "AutoItObject\AutoItObject.au3" ;=============================================================================== ;interface "OneNoteIApplication" Global Const $sCLSID_OneNoteApplication = "{0039FFEC-A022-4232-8274-6B34787BFC27}" Global Const $sIID_IOneNoteApplication = "{2DA16203-3F58-404F-839D-E4CDE7DD0DED}" ; Definition Global $dtagIOneNoteWindows = $dtagIDispatch Global $dtagIOneNoteApplication = $dtagIDispatch & _ "GetHierarchy hresult(bstr;dword;bstr*);" & _ "UpdateHierarchy hresult(bstr);" & _ "OpenHierarchy hresult(bstr;bstr;bstr*;dword);" & _ "DeleteHierarchy hresult(bstr;double);" & _ "CreateNewPage hresult(bstr;bstr*;dword);" & _ "CloseNotebook hresult(bstr);" & _ "GetHierarchyParent hresult(bstr;bstr*);" & _ "GetPageContent hresult(bstr;bstr*;dword);" & _ "UpdatePageContent hresult(bstr;double);" & _ "GetBinaryPageContent hresult(bstr;bstr;bstr*);" & _ "DeletePageContent hresult(bstr;bstr;dword);" & _ "NavigateTo hresult(bstr;bstr;bool);" & _ "Publish hresult(bstr;bstr;dword;bstr);" & _ "OpenPackage hresult(bstr;bstr;bstr*);" & _ "GetHyperlinkToObject hresult(bstr;bstr;bstr*);" & _ "FindPages hresult(bstr;bstr;bstr*;bool;bool);" & _ "FindMeta hresult(bstr;bstr;bstr*;bool);" & _ "GetSpecialLocation hresult(dword;bstr*);" ; List Global $ltagIOneNoteApplication = $ltagIDispatch & _ "GetHierarchy;" & _ "UpdateHierarchy;" & _ "OpenHierarchy;" & _ "DeleteHierarchy;" & _ "CreateNewPage;" & _ "CloseNotebook;" & _ "GetHierarchyParent;" & _ "GetPageContent;" & _ "UpdatePageContent;" & _ "GetBinaryPageContent;" & _ "DeletePageContent;" & _ "NavigateTo;" & _ "Publish;" & _ "OpenPackage;" & _ "GetHyperlinkToObject;" & _ "FindPages;" & _ "FindMeta;" & _ "GetSpecialLocation;" ;=============================================================================== _AutoItObject_StartUp() Global $objOneNote = ObjCreate("OneNote.Application") Global $pOneNote = _AutoItObject_IDispatchToPtr($objOneNote) _AutoItObject_IUnknownAddRef($objOneNote) Global $oOneNote = _AutoItObject_WrapperCreate($pOneNote, $dtagIOneNoteWindows) ;~ Global $oOnenote = ObjCreateInterface($sCLSID_OneNoteApplication,$sIID_IOneNoteApplication,$dtagIOneNoteApplication,True) ;~ ; Check if object is created: If Not IsObj($oOneNote) Then MsgBox(48, "Error", "Object not created. Something is wrong.") Exit EndIf $aCall = $oOneNote.GetTypeInfoCount(0) $iTypeInfoCount = $aCall[1] ConsoleWrite("$iTypeInfoCount = " & $iTypeInfoCount & @CRLF) $Window = $oOneNote.Windows ;~ ConsoleWrite("Test = " & $Window.CurrentPageId & @CRLF) $str = "onenote:///R:\Software\OneNote%20EOD\EOD%20Scrum\Sprint%20136.one#section-id={D2EB7AEB-362B-490A-9CE0-0B9316DF0DAD}&end" $hBSTR = DllCall("oleaut32.dll", "ptr", "SysAllocString", "wstr", $str) $aCall = $oOnenote.NavigateToUrl($hBSTR[0])  
      Can someone help me to go in the good direction? I'm a little lost with what's needed, (CLSID and IID whereas I have only a UUID and can't find a good starting doc online)
      Thanks a lot,
       
    • tcurran
      By tcurran
      Here's a short UDF that will, at least in most cases, detect whether a window can be copied from or pasted to programmatically--for example, by Send()ing ctl-c, ctl-v. This is often disabled when programs (like your AutoIt script) run at a lower UAC integrity level than the application they are trying to operate on.
      #include <WinAPI.au3> Func _WindowIsPasteable($handle) ;accepts window handle; returns true or false whether a window will accept Ctl-C, Ctl-V Local $bCanPaste = True Local $hTestWindowPID = 0 Local $hTestWindowTID = _WinAPI_GetWindowThreadProcessId($handle, $hTestWindowPID) _WinAPI_AttachThreadInput(_WinAPI_GetCurrentThreadId(), $hTestWindowTID, True);attach to window we want to paste into $bCanPaste = _WinAPI_GetFocus() ;Test whether window is paste-able--returns False if it is not _WinAPI_AttachThreadInput(_WinAPI_GetCurrentThreadId, $hTestWindowTID, False);detach from window thread Return $bCanPaste EndFunc Pass it a window handle; it returns true or false whether a window will accept programmatic pasting. The function may not work on the CMD window, since it handles the clipboard uniquely.
      This function works by attaching to the program thread of the window whose handle it receives, then attempting to perform a GetFocus on that thread. In most cases, the attempt will fail if the window will not accept programmatic copy-paste.
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