winsta.c File Reference

#include <win32k.h>

Include dependency graph for winsta.c:

Go to the source code of this file.

Functions
	DBG_DEFAULT_CHANNEL (UserWinsta)
NTSTATUS NTAPI	InitWindowStationImpl (VOID)
NTSTATUS NTAPI	UserCreateWinstaDirectory (VOID)
NTSTATUS NTAPI	IntWinStaObjectDelete (_In_ PVOID Parameters)
NTSTATUS NTAPI	IntWinStaObjectParse (_In_ PVOID Parameters)
NTSTATUS NTAPI	IntWinStaOkToClose (_In_ PVOID Parameters)
NTSTATUS FASTCALL	IntValidateWindowStationHandle (HWINSTA WindowStation, KPROCESSOR_MODE AccessMode, ACCESS_MASK DesiredAccess, PWINSTATION_OBJECT *Object, POBJECT_HANDLE_INFORMATION pObjectHandleInfo)
BOOL FASTCALL	co_IntInitializeDesktopGraphics (VOID)
VOID FASTCALL	IntEndDesktopGraphics (VOID)
HDC FASTCALL	IntGetScreenDC (VOID)
BOOL FASTCALL	CheckWinstaAttributeAccess (ACCESS_MASK DesiredAccess)
NTSTATUS FASTCALL	IntCreateWindowStation (OUT HWINSTA *phWinSta, IN POBJECT_ATTRIBUTES ObjectAttributes, IN KPROCESSOR_MODE AccessMode, IN KPROCESSOR_MODE OwnerMode, IN ACCESS_MASK dwDesiredAccess, DWORD Unknown2, DWORD Unknown3, DWORD Unknown4, DWORD Unknown5, DWORD Unknown6)
static VOID	FreeUserModeWindowStationName (IN OUT PUNICODE_STRING WindowStationName, IN PUNICODE_STRING TebStaticUnicodeString, IN OUT POBJECT_ATTRIBUTES UserModeObjectAttributes OPTIONAL, IN POBJECT_ATTRIBUTES LocalObjectAttributes OPTIONAL)
static NTSTATUS	BuildUserModeWindowStationName (IN OUT POBJECT_ATTRIBUTES UserModeObjectAttributes, IN OUT POBJECT_ATTRIBUTES LocalObjectAttributes, OUT PUNICODE_STRING *WindowStationName, OUT PUNICODE_STRING *TebStaticUnicodeString)
HWINSTA APIENTRY	NtUserCreateWindowStation (IN POBJECT_ATTRIBUTES ObjectAttributes, IN ACCESS_MASK dwDesiredAccess, DWORD Unknown2, DWORD Unknown3, DWORD Unknown4, DWORD Unknown5, DWORD Unknown6)
HWINSTA APIENTRY	NtUserOpenWindowStation (IN POBJECT_ATTRIBUTES ObjectAttributes, IN ACCESS_MASK dwDesiredAccess)
BOOL APIENTRY	NtUserCloseWindowStation (HWINSTA hWinSta)
BOOL APIENTRY	NtUserGetObjectInformation (HANDLE hObject, DWORD nIndex, PVOID pvInformation, DWORD nLength, PDWORD nLengthNeeded)
BOOL APIENTRY	NtUserSetObjectInformation (HANDLE hObject, DWORD nIndex, PVOID pvInformation, DWORD nLength)
HWINSTA FASTCALL	UserGetProcessWindowStation (VOID)
HWINSTA APIENTRY	NtUserGetProcessWindowStation (VOID)
BOOL FASTCALL	UserSetProcessWindowStation (HWINSTA hWindowStation)
BOOL APIENTRY	NtUserSetProcessWindowStation (HWINSTA hWindowStation)
BOOL APIENTRY	NtUserLockWindowStation (HWINSTA hWindowStation)
BOOL APIENTRY	NtUserUnlockWindowStation (HWINSTA hWindowStation)
static NTSTATUS FASTCALL	BuildWindowStationNameList (ULONG dwSize, PVOID lpBuffer, PULONG pRequiredSize)
static NTSTATUS FASTCALL	BuildDesktopNameList (HWINSTA hWindowStation, ULONG dwSize, PVOID lpBuffer, PULONG pRequiredSize)
NTSTATUS APIENTRY	NtUserBuildNameList (HWINSTA hWindowStation, ULONG dwSize, PVOID lpBuffer, PULONG pRequiredSize)
BOOL APIENTRY	NtUserSetLogonNotifyWindow (HWND hWnd)
BOOL APIENTRY	NtUserLockWorkStation (VOID)
BOOL NTAPI	NtUserSetWindowStationUser (IN HWINSTA hWindowStation, IN PLUID pluid, IN PSID psid OPTIONAL, IN DWORD size)

Variables
PWINSTATION_OBJECT	InputWindowStation = NULL
HWND	hwndSAS = NULL
UNICODE_STRING	gustrWindowStationsDir

Function Documentation

BuildDesktopNameList()

static NTSTATUS FASTCALL BuildDesktopNameList ( HWINSTA  hWindowStation, ULONG  dwSize, PVOID  lpBuffer, PULONG  pRequiredSize  )

static

Definition at line 1790 of file winsta.c.

{
    NTSTATUS Status;
    PWINSTATION_OBJECT WindowStation;
    PLIST_ENTRY DesktopEntry;
    PDESKTOP DesktopObject;
    DWORD EntryCount;
    ULONG ReturnLength;
    WCHAR NullWchar;
    UNICODE_STRING DesktopName;

    Status = IntValidateWindowStationHandle(hWindowStation,
                                            UserMode,
                                            0,
                                            &WindowStation,
                                            NULL);
    if (! NT_SUCCESS(Status))
    {
        return Status;
    }

    /*
     * Count the required size of buffer.
     */
    ReturnLength = sizeof(DWORD);
    EntryCount = 0;
    for (DesktopEntry = WindowStation->DesktopListHead.Flink;
         DesktopEntry != &WindowStation->DesktopListHead;
         DesktopEntry = DesktopEntry->Flink)
    {
        DesktopObject = CONTAINING_RECORD(DesktopEntry, DESKTOP, ListEntry);
        RtlInitUnicodeString(&DesktopName, DesktopObject->pDeskInfo->szDesktopName);
        ReturnLength += DesktopName.Length + sizeof(WCHAR);
        EntryCount++;
    }
    TRACE("Required size: %lu Entry count: %lu\n", ReturnLength, EntryCount);
    if (NULL != pRequiredSize)
    {
        Status = MmCopyToCaller(pRequiredSize, &ReturnLength, sizeof(ULONG));
        if (! NT_SUCCESS(Status))
        {
            ObDereferenceObject(WindowStation);
            return STATUS_BUFFER_TOO_SMALL;
        }
    }

    /*
     * Check if the supplied buffer is large enough.
     */
    if (dwSize < ReturnLength)
    {
        ObDereferenceObject(WindowStation);
        return STATUS_BUFFER_TOO_SMALL;
    }

    /*
     * Generate the resulting buffer contents.
     */
    Status = MmCopyToCaller(lpBuffer, &EntryCount, sizeof(DWORD));
    if (! NT_SUCCESS(Status))
    {
        ObDereferenceObject(WindowStation);
        return Status;
    }
    lpBuffer = (PVOID) ((PCHAR) lpBuffer + sizeof(DWORD));

    NullWchar = L'\0';
    for (DesktopEntry = WindowStation->DesktopListHead.Flink;
         DesktopEntry != &WindowStation->DesktopListHead;
         DesktopEntry = DesktopEntry->Flink)
    {
        DesktopObject = CONTAINING_RECORD(DesktopEntry, DESKTOP, ListEntry);
        RtlInitUnicodeString(&DesktopName, DesktopObject->pDeskInfo->szDesktopName);
        Status = MmCopyToCaller(lpBuffer, DesktopName.Buffer, DesktopName.Length);
        if (! NT_SUCCESS(Status))
        {
            ObDereferenceObject(WindowStation);
            return Status;
        }
        lpBuffer = (PVOID) ((PCHAR)lpBuffer + DesktopName.Length);
        Status = MmCopyToCaller(lpBuffer, &NullWchar, sizeof(WCHAR));
        if (! NT_SUCCESS(Status))
        {
            ObDereferenceObject(WindowStation);
            return Status;
        }
        lpBuffer = (PVOID) ((PCHAR) lpBuffer + sizeof(WCHAR));
    }

    /*
     * Clean up and return
     */
    ObDereferenceObject(WindowStation);
    return STATUS_SUCCESS;
}

Referenced by NtUserBuildNameList().

BuildUserModeWindowStationName()

static NTSTATUS BuildUserModeWindowStationName ( IN OUT POBJECT_ATTRIBUTES  UserModeObjectAttributes, IN OUT POBJECT_ATTRIBUTES  LocalObjectAttributes, OUT PUNICODE_STRING *  WindowStationName, OUT PUNICODE_STRING *  TebStaticUnicodeString  )

static

Definition at line 588 of file winsta.c.

{
    NTSTATUS Status;
    SIZE_T MemSize;

    LUID CallerLuid;
    PTEB Teb;
    USHORT StrSize;

    *WindowStationName = NULL;
    *TebStaticUnicodeString = NULL;

    /* Retrieve the current process LUID */
    Status = GetProcessLuid(NULL, NULL, &CallerLuid);
    if (!NT_SUCCESS(Status))
    {
        ERR("Failed to retrieve the caller LUID, Status 0x%08lx\n", Status);
        return Status;
    }

    /* Compute the needed string size */
    MemSize = _scwprintf(L"%wZ\\Service-0x%x-%x$",
                         &gustrWindowStationsDir,
                         CallerLuid.HighPart,
                         CallerLuid.LowPart);
    MemSize = MemSize * sizeof(WCHAR) + sizeof(UNICODE_NULL);
    if (MemSize > MAXUSHORT)
    {
        ERR("Window station name length is too long.\n");
        return STATUS_NAME_TOO_LONG;
    }
    StrSize = (USHORT)MemSize;

    /*
     * Check whether it's short enough so that we can use the static buffer
     * in the TEB. Otherwise continue with virtual memory allocation.
     */
    Teb = NtCurrentTeb();
    if (Teb && (StrSize <= sizeof(Teb->StaticUnicodeBuffer)))
    {
        /* We can use the TEB's static unicode string */
        ASSERT(Teb->StaticUnicodeString.Buffer == Teb->StaticUnicodeBuffer);
        ASSERT(Teb->StaticUnicodeString.MaximumLength == sizeof(Teb->StaticUnicodeBuffer));

        /* Remember the TEB's static unicode string address for later */
        *TebStaticUnicodeString = &Teb->StaticUnicodeString;

        *WindowStationName = *TebStaticUnicodeString;
        (*WindowStationName)->Length = 0;
    }
    else
    {
        /* The TEB's static unicode string is too small, allocate some user-mode virtual memory */
        MemSize += ALIGN_UP(sizeof(UNICODE_STRING), sizeof(PVOID));

        /* Allocate the memory in user-mode */
        Status = ZwAllocateVirtualMemory(ZwCurrentProcess(),
                                         (PVOID*)WindowStationName,
                                         0,
                                         &MemSize,
                                         MEM_COMMIT,
                                         PAGE_READWRITE);
        if (!NT_SUCCESS(Status))
        {
            ERR("ZwAllocateVirtualMemory() failed, Status 0x%08lx\n", Status);
            return Status;
        }

        RtlInitEmptyUnicodeString(*WindowStationName,
                                  (PWCHAR)((ULONG_PTR)*WindowStationName +
                                      ALIGN_UP(sizeof(UNICODE_STRING), sizeof(PVOID))),
                                  StrSize);
    }

    /* Build a valid window station name from the LUID */
    Status = RtlStringCbPrintfW((*WindowStationName)->Buffer,
                                (*WindowStationName)->MaximumLength,
                                L"%wZ\\Service-0x%x-%x$",
                                &gustrWindowStationsDir,
                                CallerLuid.HighPart,
                                CallerLuid.LowPart);
    if (!NT_SUCCESS(Status))
    {
        ERR("Impossible to build a valid window station name, Status 0x%08lx\n", Status);
        goto Quit;
    }
    (*WindowStationName)->Length = (USHORT)(wcslen((*WindowStationName)->Buffer) * sizeof(WCHAR));

    /* Try to update the user's UserModeObjectAttributes */
    _SEH2_TRY
    {
        ProbeForWrite(UserModeObjectAttributes, sizeof(OBJECT_ATTRIBUTES), sizeof(ULONG));
        *LocalObjectAttributes = *UserModeObjectAttributes;

        UserModeObjectAttributes->ObjectName = *WindowStationName;
        UserModeObjectAttributes->RootDirectory = NULL;

        Status = STATUS_SUCCESS;
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        Status = _SEH2_GetExceptionCode();
    }
    _SEH2_END;

Quit:
    if (!NT_SUCCESS(Status))
    {
        /* Release the window station name */
        FreeUserModeWindowStationName(*WindowStationName,
                                      *TebStaticUnicodeString,
                                      NULL, NULL);
    }

    return Status;
}

Referenced by NtUserCreateWindowStation(), and NtUserOpenWindowStation().

BuildWindowStationNameList()

static NTSTATUS FASTCALL BuildWindowStationNameList ( ULONG  dwSize, PVOID  lpBuffer, PULONG  pRequiredSize  )

static

Definition at line 1602 of file winsta.c.

{
    OBJECT_ATTRIBUTES ObjectAttributes;
    NTSTATUS Status;
    HANDLE DirectoryHandle;
    char InitialBuffer[256], *Buffer;
    ULONG Context, ReturnLength, BufferSize;
    DWORD EntryCount;
    POBJECT_DIRECTORY_INFORMATION DirEntry;
    WCHAR NullWchar;

    //
    // FIXME: Fully wrong! Since, by calling NtUserCreateWindowStation
    // with judicious parameters one can create window stations elsewhere
    // than in Windows\WindowStations directory, Win32k definitely MUST
    // maintain a list of window stations it has created, and not rely
    // on the enumeration of Windows\WindowStations !!!
    //

    /*
     * Try to open the directory.
     */
    InitializeObjectAttributes(&ObjectAttributes,
                               &gustrWindowStationsDir,
                               OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                               NULL,
                               NULL);

    Status = ZwOpenDirectoryObject(&DirectoryHandle,
                                   DIRECTORY_QUERY,
                                   &ObjectAttributes);

    if (!NT_SUCCESS(Status))
    {
        return Status;
    }

    /* First try to query the directory using a fixed-size buffer */
    Context = 0;
    Buffer = NULL;
    Status = ZwQueryDirectoryObject(DirectoryHandle,
                                    InitialBuffer,
                                    sizeof(InitialBuffer),
                                    FALSE,
                                    TRUE,
                                    &Context,
                                    &ReturnLength);
    if (NT_SUCCESS(Status))
    {
        if (STATUS_NO_MORE_ENTRIES == ZwQueryDirectoryObject(DirectoryHandle, NULL, 0, FALSE,
                                                             FALSE, &Context, NULL))
        {
            /* Our fixed-size buffer is large enough */
            Buffer = InitialBuffer;
        }
    }

    if (NULL == Buffer)
    {
        /* Need a larger buffer, check how large exactly */
        Status = ZwQueryDirectoryObject(DirectoryHandle, NULL, 0, FALSE, TRUE, &Context,
                                        &ReturnLength);
        if (!NT_SUCCESS(Status))
        {
            ERR("ZwQueryDirectoryObject failed\n");
            ZwClose(DirectoryHandle);
            return Status;
        }

        BufferSize = ReturnLength;
        Buffer = ExAllocatePoolWithTag(PagedPool, BufferSize, TAG_WINSTA);
        if (NULL == Buffer)
        {
            ZwClose(DirectoryHandle);
            return STATUS_NO_MEMORY;
        }

        /* We should have a sufficiently large buffer now */
        Context = 0;
        Status = ZwQueryDirectoryObject(DirectoryHandle, Buffer, BufferSize,
                                        FALSE, TRUE, &Context, &ReturnLength);
        if (! NT_SUCCESS(Status) ||
              STATUS_NO_MORE_ENTRIES != ZwQueryDirectoryObject(DirectoryHandle, NULL, 0, FALSE,
                                                               FALSE, &Context, NULL))
        {
            /* Something went wrong, maybe someone added a directory entry? Just give up. */
            ExFreePoolWithTag(Buffer, TAG_WINSTA);
            ZwClose(DirectoryHandle);
            return NT_SUCCESS(Status) ? STATUS_INTERNAL_ERROR : Status;
        }
    }

    ZwClose(DirectoryHandle);

    /*
     * Count the required size of buffer.
     */
    ReturnLength = sizeof(DWORD);
    EntryCount = 0;
    for (DirEntry = (POBJECT_DIRECTORY_INFORMATION) Buffer;
         0 != DirEntry->Name.Length;
         DirEntry++)
    {
        ReturnLength += DirEntry->Name.Length + sizeof(WCHAR);
        EntryCount++;
    }
    TRACE("Required size: %lu Entry count: %lu\n", ReturnLength, EntryCount);
    if (NULL != pRequiredSize)
    {
        Status = MmCopyToCaller(pRequiredSize, &ReturnLength, sizeof(ULONG));
        if (! NT_SUCCESS(Status))
        {
            if (Buffer != InitialBuffer)
            {
                ExFreePoolWithTag(Buffer, TAG_WINSTA);
            }
            return STATUS_BUFFER_TOO_SMALL;
        }
    }

    /*
     * Check if the supplied buffer is large enough.
     */
    if (dwSize < ReturnLength)
    {
        if (Buffer != InitialBuffer)
        {
            ExFreePoolWithTag(Buffer, TAG_WINSTA);
        }
        return STATUS_BUFFER_TOO_SMALL;
    }

    /*
     * Generate the resulting buffer contents.
     */
    Status = MmCopyToCaller(lpBuffer, &EntryCount, sizeof(DWORD));
    if (! NT_SUCCESS(Status))
    {
        if (Buffer != InitialBuffer)
        {
            ExFreePoolWithTag(Buffer, TAG_WINSTA);
        }
        return Status;
    }
    lpBuffer = (PVOID) ((PCHAR) lpBuffer + sizeof(DWORD));

    NullWchar = L'\0';
    for (DirEntry = (POBJECT_DIRECTORY_INFORMATION) Buffer;
         0 != DirEntry->Name.Length;
         DirEntry++)
    {
        Status = MmCopyToCaller(lpBuffer, DirEntry->Name.Buffer, DirEntry->Name.Length);
        if (! NT_SUCCESS(Status))
        {
            if (Buffer != InitialBuffer)
            {
                ExFreePoolWithTag(Buffer, TAG_WINSTA);
            }
            return Status;
        }
        lpBuffer = (PVOID) ((PCHAR) lpBuffer + DirEntry->Name.Length);
        Status = MmCopyToCaller(lpBuffer, &NullWchar, sizeof(WCHAR));
        if (! NT_SUCCESS(Status))
        {
            if (Buffer != InitialBuffer)
            {
                ExFreePoolWithTag(Buffer, TAG_WINSTA);
            }
            return Status;
        }
        lpBuffer = (PVOID) ((PCHAR) lpBuffer + sizeof(WCHAR));
    }

    /*
     * Clean up
     */
    if (Buffer != InitialBuffer)
    {
        ExFreePoolWithTag(Buffer, TAG_WINSTA);
    }

    return STATUS_SUCCESS;
}

Referenced by NtUserBuildNameList().

CheckWinstaAttributeAccess()

BOOL FASTCALL CheckWinstaAttributeAccess

(

ACCESS_MASK

DesiredAccess

)

Definition at line 369 of file winsta.c.

{
    PPROCESSINFO ppi = PsGetCurrentProcessWin32Process();
    if ( gpidLogon != PsGetCurrentProcessId() )
    {
        if (!(ppi->W32PF_flags & W32PF_IOWINSTA))
        {
            ERR("Requires Interactive Window Station\n");
            EngSetLastError(ERROR_REQUIRES_INTERACTIVE_WINDOWSTATION);
            return FALSE;
        }
        if (!RtlAreAllAccessesGranted(ppi->amwinsta, DesiredAccess))
        {
            ERR("Access Denied\n");
            EngSetLastError(ERROR_ACCESS_DENIED);
            return FALSE;
        }
    }
    return TRUE;
}

Referenced by NtUserGetClipCursor(), NtUserSetSystemCursor(), and UserClipCursor().

co_IntInitializeDesktopGraphics()

BOOL FASTCALL co_IntInitializeDesktopGraphics

(

VOID

)

Definition at line 260 of file winsta.c.

{
    TEXTMETRICW tmw;
    UNICODE_STRING DriverName = RTL_CONSTANT_STRING(L"DISPLAY");
    PDESKTOP pdesk;

    ScreenDeviceContext = IntGdiCreateDC(&DriverName, NULL, NULL, NULL, FALSE);
    if (NULL == ScreenDeviceContext)
    {
        IntDestroyPrimarySurface();
        return FALSE;
    }
    GreSetDCOwner(ScreenDeviceContext, GDI_OBJ_HMGR_PUBLIC);

    if (!IntCreatePrimarySurface())
    {
        return FALSE;
    }

    hSystemBM = NtGdiCreateCompatibleDC(ScreenDeviceContext);

    NtGdiSelectFont(hSystemBM, NtGdiGetStockObject(SYSTEM_FONT));
    GreSetDCOwner(hSystemBM, GDI_OBJ_HMGR_PUBLIC);

    /* Update the system metrics */
    InitMetrics();

    /* Set new size of the monitor */
    UserUpdateMonitorSize((HDEV)gppdevPrimary);

    /* Update the SERVERINFO */
    gpsi->aiSysMet[SM_CXSCREEN] = gppdevPrimary->gdiinfo.ulHorzRes;
    gpsi->aiSysMet[SM_CYSCREEN] = gppdevPrimary->gdiinfo.ulVertRes;
    gpsi->Planes        = NtGdiGetDeviceCaps(ScreenDeviceContext, PLANES);
    gpsi->BitsPixel     = NtGdiGetDeviceCaps(ScreenDeviceContext, BITSPIXEL);
    gpsi->BitCount      = gpsi->Planes * gpsi->BitsPixel;
    gpsi->dmLogPixels   = NtGdiGetDeviceCaps(ScreenDeviceContext, LOGPIXELSY);
    if (NtGdiGetDeviceCaps(ScreenDeviceContext, RASTERCAPS) & RC_PALETTE)
    {
        gpsi->PUSIFlags |= PUSIF_PALETTEDISPLAY;
    }
    else
    {
        gpsi->PUSIFlags &= ~PUSIF_PALETTEDISPLAY;
    }
    // Font is realized and this dc was previously set to internal DC_ATTR.
    gpsi->cxSysFontChar = IntGetCharDimensions(hSystemBM, &tmw, (DWORD*)&gpsi->cySysFontChar);
    gpsi->tmSysFont     = tmw;

    /* Put the pointer in the center of the screen */
    gpsi->ptCursor.x = gpsi->aiSysMet[SM_CXSCREEN] / 2;
    gpsi->ptCursor.y = gpsi->aiSysMet[SM_CYSCREEN] / 2;

    /* Attach monitor */
    UserAttachMonitor((HDEV)gppdevPrimary);

    /* Setup the cursor */
    co_IntLoadDefaultCursors();

    /* Setup the icons */
    co_IntSetWndIcons();

    /* Setup Menu */
    MenuInit();

    /* Show the desktop */
    pdesk = IntGetActiveDesktop();
    ASSERT(pdesk);
    co_IntShowDesktop(pdesk, gpsi->aiSysMet[SM_CXSCREEN], gpsi->aiSysMet[SM_CYSCREEN], TRUE);

    /* HACK: display wallpaper on all secondary displays */
    {
        PGRAPHICS_DEVICE pGraphicsDevice;
        UNICODE_STRING DriverName = RTL_CONSTANT_STRING(L"DISPLAY");
        UNICODE_STRING DisplayName;
        HDC hdc;
        ULONG iDevNum;

        for (iDevNum = 1; (pGraphicsDevice = EngpFindGraphicsDevice(NULL, iDevNum, 0)) != NULL; iDevNum++)
        {
            RtlInitUnicodeString(&DisplayName, pGraphicsDevice->szWinDeviceName);
            hdc = IntGdiCreateDC(&DriverName, &DisplayName, NULL, NULL, FALSE);
            IntPaintDesktop(hdc);
        }
    }

    return TRUE;
}

Referenced by co_AddGuiApp().

DBG_DEFAULT_CHANNEL()

DBG_DEFAULT_CHANNEL

(

UserWinsta

)

FreeUserModeWindowStationName()

static VOID FreeUserModeWindowStationName ( IN OUT PUNICODE_STRING  WindowStationName, IN PUNICODE_STRING  TebStaticUnicodeString, IN OUT POBJECT_ATTRIBUTES UserModeObjectAttributes  OPTIONAL, IN POBJECT_ATTRIBUTES LocalObjectAttributes  OPTIONAL  )

static

Definition at line 554 of file winsta.c.

{
    SIZE_T MemSize = 0;

    /* Try to restore the user's UserModeObjectAttributes */
    if (UserModeObjectAttributes && LocalObjectAttributes)
    {
        _SEH2_TRY
        {
            ProbeForWrite(UserModeObjectAttributes, sizeof(OBJECT_ATTRIBUTES), sizeof(ULONG));
            *UserModeObjectAttributes = *LocalObjectAttributes;
        }
        _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
        {
            NOTHING;
        }
        _SEH2_END;
    }

    /* Free the user-mode memory */
    if (WindowStationName && (WindowStationName != TebStaticUnicodeString))
    {
        ZwFreeVirtualMemory(ZwCurrentProcess(),
                            (PVOID*)&WindowStationName,
                            &MemSize,
                            MEM_RELEASE);
    }
}

Referenced by BuildUserModeWindowStationName(), NtUserCreateWindowStation(), and NtUserOpenWindowStation().

InitWindowStationImpl()

NTSTATUS NTAPI InitWindowStationImpl

(

VOID

)

Definition at line 34 of file winsta.c.

{
    GENERIC_MAPPING IntWindowStationMapping = { WINSTA_READ,
                                                WINSTA_WRITE,
                                                WINSTA_EXECUTE,
                                                WINSTA_ACCESS_ALL};

    /* Set Winsta Object Attributes */
    ExWindowStationObjectType->TypeInfo.DefaultNonPagedPoolCharge = sizeof(WINSTATION_OBJECT);
    ExWindowStationObjectType->TypeInfo.GenericMapping = IntWindowStationMapping;
    ExWindowStationObjectType->TypeInfo.ValidAccessMask = WINSTA_ACCESS_ALL;

    return STATUS_SUCCESS;
}

Referenced by DriverEntry().

IntCreateWindowStation()

NTSTATUS FASTCALL IntCreateWindowStation	(	OUT HWINSTA *	phWinSta,
		IN POBJECT_ATTRIBUTES	ObjectAttributes,
		IN KPROCESSOR_MODE	AccessMode,
		IN KPROCESSOR_MODE	OwnerMode,
		IN ACCESS_MASK	dwDesiredAccess,
		DWORD	Unknown2,
		DWORD	Unknown3,
		DWORD	Unknown4,
		DWORD	Unknown5,
		DWORD	Unknown6
	)

Definition at line 427 of file winsta.c.

{
    NTSTATUS Status;
    HWINSTA hWinSta;
    PWINSTATION_OBJECT WindowStation;

    TRACE("IntCreateWindowStation called\n");

    ASSERT(phWinSta);
    *phWinSta = NULL;

    Status = ObOpenObjectByName(ObjectAttributes,
                                ExWindowStationObjectType,
                                AccessMode,
                                NULL,
                                dwDesiredAccess,
                                NULL,
                                (PVOID*)&hWinSta);
    if (NT_SUCCESS(Status))
    {
        TRACE("IntCreateWindowStation opened window station '%wZ'\n",
              ObjectAttributes->ObjectName);
        *phWinSta = hWinSta;
        return Status;
    }

    /*
     * No existing window station found, try to create a new one.
     */

    /* Create the window station object */
    Status = ObCreateObject(AccessMode,
                            ExWindowStationObjectType,
                            ObjectAttributes,
                            OwnerMode,
                            NULL,
                            sizeof(WINSTATION_OBJECT),
                            0,
                            0,
                            (PVOID*)&WindowStation);
    if (!NT_SUCCESS(Status))
    {
        ERR("ObCreateObject failed for window station '%wZ', Status 0x%08lx\n",
            ObjectAttributes->ObjectName, Status);
        SetLastNtError(Status);
        return Status;
    }

    /* Initialize the window station */
    RtlZeroMemory(WindowStation, sizeof(WINSTATION_OBJECT));

    InitializeListHead(&WindowStation->DesktopListHead);
    WindowStation->dwSessionId = NtCurrentPeb()->SessionId;
    Status = RtlCreateAtomTable(37, &WindowStation->AtomTable);
    if (!NT_SUCCESS(Status))
    {
        ERR("RtlCreateAtomTable failed for window station '%wZ', Status 0x%08lx\n",
            ObjectAttributes->ObjectName, Status);
        ObDereferenceObject(WindowStation);
        SetLastNtError(Status);
        return Status;
    }

    Status = ObInsertObject(WindowStation,
                            NULL,
                            dwDesiredAccess,
                            0,
                            NULL,
                            (PVOID*)&hWinSta);
    if (!NT_SUCCESS(Status))
    {
        ERR("ObInsertObject failed for window station, Status 0x%08lx\n", Status);
        SetLastNtError(Status);
        return Status;
    }

    // FIXME! TODO: Add this new window station to a linked list

    if (InputWindowStation == NULL)
    {
        ERR("Initializing input window station\n");

        /* Only Winlogon can create the interactive window station */
        ASSERT(gpidLogon == PsGetCurrentProcessId());

        InputWindowStation = WindowStation;
        WindowStation->Flags &= ~WSS_NOIO;

        InitCursorImpl();

        UserCreateSystemThread(ST_DESKTOP_THREAD);
        UserCreateSystemThread(ST_RIT);

        /* Desktop functions require the desktop thread running so wait for it to initialize */
        UserLeaveCo();
        KeWaitForSingleObject(gpDesktopThreadStartedEvent,
                              UserRequest,
                              UserMode,
                              FALSE,
                              NULL);
        UserEnterCo();
    }
    else
    {
        WindowStation->Flags |= WSS_NOIO;
    }

    TRACE("IntCreateWindowStation created window station '%wZ' object 0x%p handle 0x%p\n",
          ObjectAttributes->ObjectName, WindowStation, hWinSta);

    *phWinSta = hWinSta;
    EngSetLastError(ERROR_SUCCESS);

    return STATUS_SUCCESS;
}

Referenced by IntResolveDesktop(), and NtUserCreateWindowStation().

IntEndDesktopGraphics()

VOID FASTCALL IntEndDesktopGraphics

(

VOID

)

Definition at line 350 of file winsta.c.

{
    if (NULL != ScreenDeviceContext)
    {  // No need to allocate a new dcattr.
        GreSetDCOwner(ScreenDeviceContext, GDI_OBJ_HMGR_POWNED);
        GreDeleteObject(ScreenDeviceContext);
        ScreenDeviceContext = NULL;
    }
    IntHideDesktop(IntGetActiveDesktop());
    IntDestroyPrimarySurface();
}

Referenced by RemoveGuiApp().

IntGetScreenDC()

HDC FASTCALL IntGetScreenDC

(

VOID

)

Definition at line 363 of file winsta.c.

{
    return ScreenDeviceContext;
}

Referenced by co_MsqInsertMouseMessage(), MsqCleanupMessageQueue(), UserSetCursor(), and UserShowCursor().

IntValidateWindowStationHandle()

NTSTATUS FASTCALL IntValidateWindowStationHandle	(	HWINSTA	WindowStation,
		KPROCESSOR_MODE	AccessMode,
		ACCESS_MASK	DesiredAccess,
		PWINSTATION_OBJECT *	Object,
		POBJECT_HANDLE_INFORMATION	pObjectHandleInfo
	)

Definition at line 230 of file winsta.c.

{
    NTSTATUS Status;

    if (WindowStation == NULL)
    {
        ERR("Invalid window station handle\n");
        EngSetLastError(ERROR_INVALID_HANDLE);
        return STATUS_INVALID_HANDLE;
    }

    Status = ObReferenceObjectByHandle(WindowStation,
                                       DesiredAccess,
                                       ExWindowStationObjectType,
                                       AccessMode,
                                       (PVOID*)Object,
                                       pObjectHandleInfo);

    if (!NT_SUCCESS(Status))
        SetLastNtError(Status);

    return Status;
}

Referenced by BuildDesktopNameList(), IntGetWinStaForCbAccess(), NtUserCloseWindowStation(), NtUserLockWindowStation(), NtUserSetShellWindowEx(), NtUserSetWindowsHookEx(), NtUserSetWindowStationUser(), NtUserUnlockWindowStation(), UserCreateMenu(), UserGetShellWindow(), and UserSetProcessWindowStation().

IntWinStaObjectDelete()

NTSTATUS NTAPI IntWinStaObjectDelete

(

_In_ PVOID

Parameters

)

Definition at line 106 of file winsta.c.

{
    PWIN32_DELETEMETHOD_PARAMETERS DeleteParameters = Parameters;
    PWINSTATION_OBJECT WinSta = (PWINSTATION_OBJECT)DeleteParameters->Object;

    TRACE("Deleting window station 0x%p\n", WinSta);

    if (WinSta == InputWindowStation)
    {
        ERR("WARNING: Deleting the interactive window station '%wZ'!\n",
            &(OBJECT_HEADER_TO_NAME_INFO(OBJECT_TO_OBJECT_HEADER(InputWindowStation))->Name));

        /* Only Winlogon can close and delete the interactive window station */
        ASSERT(gpidLogon == PsGetCurrentProcessId());

        InputWindowStation = NULL;
    }

    WinSta->Flags |= WSS_DYING;

    UserEmptyClipboardData(WinSta);

    RtlDestroyAtomTable(WinSta->AtomTable);

    return STATUS_SUCCESS;
}

Referenced by DriverEntry().

IntWinStaObjectParse()

NTSTATUS NTAPI IntWinStaObjectParse

(

_In_ PVOID

Parameters

)

Definition at line 136 of file winsta.c.

{
    PWIN32_PARSEMETHOD_PARAMETERS ParseParameters = Parameters;
    PUNICODE_STRING RemainingName = ParseParameters->RemainingName;

    /* Assume we don't find anything */
    *ParseParameters->Object = NULL;

    /* Check for an empty name */
    if (!RemainingName->Length)
    {
        /* Make sure this is a window station, can't parse a desktop now */
        if (ParseParameters->ObjectType != ExWindowStationObjectType)
        {
            /* Fail */
            return STATUS_OBJECT_TYPE_MISMATCH;
        }

        /* Reference the window station and return */
        ObReferenceObject(ParseParameters->ParseObject);
        *ParseParameters->Object = ParseParameters->ParseObject;
        return STATUS_SUCCESS;
    }

    /* Check for leading slash */
    if (RemainingName->Buffer[0] == OBJ_NAME_PATH_SEPARATOR)
    {
        /* Skip it */
        RemainingName->Buffer++;
        RemainingName->Length -= sizeof(WCHAR);
        RemainingName->MaximumLength -= sizeof(WCHAR);
    }

    /* Check if there is still a slash */
    if (wcschr(RemainingName->Buffer, OBJ_NAME_PATH_SEPARATOR))
    {
        /* In this case, fail */
        return STATUS_OBJECT_PATH_INVALID;
    }

    /*
     * Check if we are parsing a desktop.
     */
    if (ParseParameters->ObjectType == ExDesktopObjectType)
    {
        /* Then call the desktop parse routine */
        return IntDesktopObjectParse(ParseParameters->ParseObject,
                                     ParseParameters->ObjectType,
                                     ParseParameters->AccessState,
                                     ParseParameters->AccessMode,
                                     ParseParameters->Attributes,
                                     ParseParameters->CompleteName,
                                     RemainingName,
                                     ParseParameters->Context,
                                     ParseParameters->SecurityQos,
                                     ParseParameters->Object);
    }

    /* Should hopefully never get here */
    return STATUS_OBJECT_TYPE_MISMATCH;
}

Referenced by DriverEntry().

IntWinStaOkToClose()

NTSTATUS NTAPI IntWinStaOkToClose

(

_In_ PVOID

Parameters

)

Definition at line 201 of file winsta.c.

{
    PWIN32_OKAYTOCLOSEMETHOD_PARAMETERS OkToCloseParameters = Parameters;
    PPROCESSINFO ppi;

    ppi = PsGetCurrentProcessWin32Process();

    if (ppi && (OkToCloseParameters->Handle == ppi->hwinsta))
    {
        return STATUS_ACCESS_DENIED;
    }

    return STATUS_SUCCESS;
}

Referenced by DriverEntry().

NtUserBuildNameList()

NTSTATUS APIENTRY NtUserBuildNameList	(	HWINSTA	hWindowStation,
		ULONG	dwSize,
		PVOID	lpBuffer,
		PULONG	pRequiredSize
	)

Definition at line 1917 of file winsta.c.

{
    /* The WindowStation name list and desktop name list are build in completely
       different ways. Call the appropriate function */
    return NULL == hWindowStation ? BuildWindowStationNameList(dwSize, lpBuffer, pRequiredSize) :
           BuildDesktopNameList(hWindowStation, dwSize, lpBuffer, pRequiredSize);
}

Referenced by EnumNamesW().

NtUserCloseWindowStation()

BOOL APIENTRY NtUserCloseWindowStation

(

HWINSTA

hWinSta

)

Definition at line 999 of file winsta.c.

{
    PWINSTATION_OBJECT Object;
    NTSTATUS Status;

    TRACE("NtUserCloseWindowStation called (%p)\n", hWinSta);

    if (hWinSta == UserGetProcessWindowStation())
    {
        ERR("Attempted to close process window station\n");
        return FALSE;
    }

    Status = IntValidateWindowStationHandle(hWinSta,
                                            UserMode,
                                            0,
                                            &Object,
                                            NULL);
    if (!NT_SUCCESS(Status))
    {
        ERR("Validation of window station handle (%p) failed\n", hWinSta);
        return FALSE;
    }

    ObDereferenceObject(Object);

    TRACE("Closing window station handle (%p)\n", hWinSta);

    Status = ObCloseHandle(hWinSta, UserMode);
    if (!NT_SUCCESS(Status))
    {
        SetLastNtError(Status);
        return FALSE;
    }

    return TRUE;
}

Referenced by CloseWindowStation().

NtUserCreateWindowStation()

HWINSTA APIENTRY NtUserCreateWindowStation	(	IN POBJECT_ATTRIBUTES	ObjectAttributes,
		IN ACCESS_MASK	dwDesiredAccess,
		DWORD	Unknown2,
		DWORD	Unknown3,
		DWORD	Unknown4,
		DWORD	Unknown5,
		DWORD	Unknown6
	)

Definition at line 711 of file winsta.c.

{
    NTSTATUS Status = STATUS_SUCCESS;
    HWINSTA hWinSta = NULL;
    OBJECT_ATTRIBUTES LocalObjectAttributes;
    PUNICODE_STRING WindowStationName = NULL;
    PUNICODE_STRING TebStaticUnicodeString = NULL;
    KPROCESSOR_MODE OwnerMode = UserMode;

    TRACE("NtUserCreateWindowStation called\n");

    /* Capture the object attributes and the window station name */
    _SEH2_TRY
    {
        ProbeForRead(ObjectAttributes, sizeof(OBJECT_ATTRIBUTES), sizeof(ULONG));
        LocalObjectAttributes = *ObjectAttributes;
        if (LocalObjectAttributes.Length != sizeof(OBJECT_ATTRIBUTES))
        {
            ERR("Invalid ObjectAttributes length!\n");
            Status = STATUS_INVALID_PARAMETER;
            _SEH2_LEAVE;
        }

        /*
         * Check whether the caller provided a window station name together
         * with a RootDirectory handle.
         *
         * If the caller did not provide a window station name, build a new one
         * based on the logon session identifier for the calling process.
         * The new name is allocated in user-mode, as the rest of ObjectAttributes
         * already is, so that the validation performed by the Object Manager
         * can be done adequately.
         */
        if ((LocalObjectAttributes.ObjectName == NULL ||
             LocalObjectAttributes.ObjectName->Buffer == NULL ||
             LocalObjectAttributes.ObjectName->Length == 0 ||
             LocalObjectAttributes.ObjectName->Buffer[0] == UNICODE_NULL)
            /* &&
            LocalObjectAttributes.RootDirectory == NULL */)
        {
            /* No, build the new window station name */
            Status = BuildUserModeWindowStationName(ObjectAttributes,
                                                    &LocalObjectAttributes,
                                                    &WindowStationName,
                                                    &TebStaticUnicodeString);
            if (!NT_SUCCESS(Status))
            {
                ERR("BuildUserModeWindowStationName() failed, Status 0x%08lx\n", Status);
                _SEH2_LEAVE;
            }
            OwnerMode = KernelMode;
        }
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        Status =_SEH2_GetExceptionCode();
        ERR("ObjectAttributes capture failed, Status 0x%08lx\n", Status);
    }
    _SEH2_END;

    if (!NT_SUCCESS(Status))
    {
        SetLastNtError(Status);
        return NULL;
    }

    UserEnterExclusive();

    /* Create the window station */
    Status = IntCreateWindowStation(&hWinSta,
                                    ObjectAttributes,
                                    UserMode,
                                    OwnerMode,
                                    dwDesiredAccess,
                                    Unknown2,
                                    Unknown3,
                                    Unknown4,
                                    Unknown5,
                                    Unknown6);
    UserLeave();

    if (NT_SUCCESS(Status))
    {
        TRACE("NtUserCreateWindowStation created window station '%wZ' with handle 0x%p\n",
              ObjectAttributes->ObjectName, hWinSta);
    }
    else
    {
        ASSERT(hWinSta == NULL);
        ERR("NtUserCreateWindowStation failed to create window station '%wZ', Status 0x%08lx\n",
            ObjectAttributes->ObjectName, Status);
    }

    /* Try to restore the user's ObjectAttributes and release the window station name */
    FreeUserModeWindowStationName(WindowStationName,
                                  TebStaticUnicodeString,
                                  (OwnerMode == KernelMode ? ObjectAttributes : NULL),
                                  &LocalObjectAttributes);

    if (!NT_SUCCESS(Status))
    {
        ASSERT(hWinSta == NULL);
        SetLastNtError(Status);
    }

    return hWinSta;
}

Referenced by CreateWindowStationW().

NtUserGetObjectInformation()

BOOL APIENTRY NtUserGetObjectInformation	(	HANDLE	hObject,
		DWORD	nIndex,
		PVOID	pvInformation,
		DWORD	nLength,
		PDWORD	nLengthNeeded
	)

Definition at line 1079 of file winsta.c.

{
    NTSTATUS Status;
    PWINSTATION_OBJECT WinStaObject = NULL;
    PDESKTOP DesktopObject = NULL;
    POBJECT_HEADER ObjectHeader;
    POBJECT_HEADER_NAME_INFO NameInfo;
    OBJECT_HANDLE_INFORMATION HandleInfo;
    USEROBJECTFLAGS ObjectFlags;
    PUNICODE_STRING pStrNameU = NULL;
    PVOID pvData = NULL;
    SIZE_T nDataSize = 0;

    _SEH2_TRY
    {
        if (nLengthNeeded)
            ProbeForWrite(nLengthNeeded, sizeof(*nLengthNeeded), 1);
        ProbeForWrite(pvInformation, nLength, 1);
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        SetLastNtError(_SEH2_GetExceptionCode());
        return FALSE;
    }
    _SEH2_END;

    /* Try window station */
    TRACE("Trying to open window station 0x%p\n", hObject);
    Status = ObReferenceObjectByHandle(hObject,
                                       0,
                                       ExWindowStationObjectType,
                                       UserMode,
                                       (PVOID*)&WinStaObject,
                                       &HandleInfo);

    if (Status == STATUS_OBJECT_TYPE_MISMATCH)
    {
        /* Try desktop */
        TRACE("Trying to open desktop %p\n", hObject);
        WinStaObject = NULL;
        Status = IntValidateDesktopHandle(hObject,
                                          UserMode,
                                          0,
                                          &DesktopObject);
    }

    if (!NT_SUCCESS(Status))
    {
        ERR("Failed: 0x%x\n", Status);
        goto Exit;
    }

    TRACE("WinSta or Desktop opened!\n");

    /* Get data */
    switch (nIndex)
    {
        case UOI_FLAGS:
        {
            ObjectFlags.fReserved = FALSE;
            ObjectFlags.fInherit = !!(HandleInfo.HandleAttributes & OBJ_INHERIT);

            ObjectFlags.dwFlags = 0;
            if (WinStaObject != NULL)
            {
                if (!(WinStaObject->Flags & WSS_NOIO))
                    ObjectFlags.dwFlags |= WSF_VISIBLE;
            }
            else if (DesktopObject != NULL)
            {
                FIXME("Setting DF_ALLOWOTHERACCOUNTHOOK is unimplemented.\n");
            }
            else
            {
                ERR("No associated WinStaObject nor DesktopObject!\n");
            }

            pvData = &ObjectFlags;
            nDataSize = sizeof(ObjectFlags);
            Status = STATUS_SUCCESS;
            break;
        }

        case UOI_NAME:
        {
            if (WinStaObject != NULL)
            {
                ObjectHeader = OBJECT_TO_OBJECT_HEADER(WinStaObject);
                NameInfo = OBJECT_HEADER_TO_NAME_INFO(ObjectHeader);

                if (NameInfo && (NameInfo->Name.Length > 0))
                {
                    /* Named window station */
                    pStrNameU = &NameInfo->Name;
                    nDataSize = pStrNameU->Length + sizeof(UNICODE_NULL);
                }
                else
                {
                    /* Unnamed window station (should never happen!) */
                    ASSERT(FALSE);
                    pStrNameU = NULL;
                    nDataSize = sizeof(UNICODE_NULL);
                }
                Status = STATUS_SUCCESS;
            }
            else if (DesktopObject != NULL)
            {
                pvData = DesktopObject->pDeskInfo->szDesktopName;
                nDataSize = (wcslen(DesktopObject->pDeskInfo->szDesktopName) + 1) * sizeof(WCHAR);
                Status = STATUS_SUCCESS;
            }
            else
            {
                Status = STATUS_INVALID_PARAMETER;
            }
            break;
        }

        case UOI_TYPE:
        {
            if (WinStaObject != NULL)
            {
                ObjectHeader = OBJECT_TO_OBJECT_HEADER(WinStaObject);
                pStrNameU = &ObjectHeader->Type->Name;
                nDataSize = pStrNameU->Length + sizeof(UNICODE_NULL);
                Status = STATUS_SUCCESS;
            }
            else if (DesktopObject != NULL)
            {
                ObjectHeader = OBJECT_TO_OBJECT_HEADER(DesktopObject);
                pStrNameU = &ObjectHeader->Type->Name;
                nDataSize = pStrNameU->Length + sizeof(UNICODE_NULL);
                Status = STATUS_SUCCESS;
            }
            else
            {
                Status = STATUS_INVALID_PARAMETER;
            }
            break;
        }

        case UOI_USER_SID:
            Status = STATUS_NOT_IMPLEMENTED;
            ERR("UOI_USER_SID unimplemented!\n");
            break;

        default:
            Status = STATUS_INVALID_PARAMETER;
            break;
    }

Exit:
    if ((Status == STATUS_SUCCESS) && (nLength < nDataSize))
        Status = STATUS_BUFFER_TOO_SMALL;

    _SEH2_TRY
    {
        if (nLengthNeeded)
            *nLengthNeeded = nDataSize;

        /* Try to copy data to caller */
        if (Status == STATUS_SUCCESS && (nDataSize > 0))
        {
            TRACE("Trying to copy data to caller (len = %lu, len needed = %lu)\n", nLength, nDataSize);
            if (pvData)
            {
                /* Copy the data */
                RtlCopyMemory(pvInformation, pvData, nDataSize);
            }
            else if (pStrNameU)
            {
                /* Copy and NULL-terminate the string */
                RtlCopyMemory(pvInformation, pStrNameU->Buffer, pStrNameU->Length);
                ((PWCHAR)pvInformation)[pStrNameU->Length / sizeof(WCHAR)] = UNICODE_NULL;
            }
            else
            {
                /* Zero the memory */
                RtlZeroMemory(pvInformation, nDataSize);
            }
        }
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        Status = _SEH2_GetExceptionCode();
    }
    _SEH2_END;

    /* Release objects */
    if (DesktopObject != NULL)
        ObDereferenceObject(DesktopObject);
    if (WinStaObject != NULL)
        ObDereferenceObject(WinStaObject);

    if (!NT_SUCCESS(Status))
    {
        SetLastNtError(Status);
        return FALSE;
    }

    return TRUE;
}

Referenced by GetUserObjectInformationW().

NtUserGetProcessWindowStation()

HWINSTA APIENTRY NtUserGetProcessWindowStation

(

VOID

)

Definition at line 1356 of file winsta.c.

{
    return UserGetProcessWindowStation();
}

Referenced by CreateDesktopW(), and GetProcessWindowStation().

NtUserLockWindowStation()

BOOL APIENTRY NtUserLockWindowStation

(

HWINSTA

hWindowStation

)

Definition at line 1521 of file winsta.c.

{
    PWINSTATION_OBJECT Object;
    NTSTATUS Status;

    TRACE("About to set process window station with handle (%p)\n",
          hWindowStation);

    if (gpidLogon != PsGetCurrentProcessId())
    {
        ERR("Unauthorized process attempted to lock the window station!\n");
        EngSetLastError(ERROR_ACCESS_DENIED);
        return FALSE;
    }

    Status = IntValidateWindowStationHandle(hWindowStation,
                                            UserMode,
                                            0,
                                            &Object,
                                            NULL);
    if (!NT_SUCCESS(Status))
    {
        TRACE("Validation of window station handle (%p) failed\n",
              hWindowStation);
        SetLastNtError(Status);
        return FALSE;
    }

    Object->Flags |= WSS_LOCKED;

    ObDereferenceObject(Object);
    return TRUE;
}

Referenced by LockWindowStation().

NtUserLockWorkStation()

BOOL APIENTRY NtUserLockWorkStation

(

VOID

)

Definition at line 1952 of file winsta.c.

{
    BOOL ret;
    PTHREADINFO pti = PsGetCurrentThreadWin32Thread();

    UserEnterExclusive();

    if (pti->rpdesk == IntGetActiveDesktop())
    {
        ret = UserPostMessage(hwndSAS, WM_LOGONNOTIFY, LN_LOCK_WORKSTATION, 0);
    }
    else
    {
        ret = FALSE;
    }

    UserLeave();

    return ret;
}

Referenced by LockWorkStation().

NtUserOpenWindowStation()

HWINSTA APIENTRY NtUserOpenWindowStation	(	IN POBJECT_ATTRIBUTES	ObjectAttributes,
		IN ACCESS_MASK	dwDesiredAccess
	)

Definition at line 852 of file winsta.c.

{
    NTSTATUS Status = STATUS_SUCCESS;
    HWINSTA hWinSta = NULL;
    OBJECT_ATTRIBUTES LocalObjectAttributes;
    PUNICODE_STRING WindowStationName = NULL;
    PUNICODE_STRING TebStaticUnicodeString = NULL;
    KPROCESSOR_MODE OwnerMode = UserMode;

    TRACE("NtUserOpenWindowStation called\n");

    /* Capture the object attributes and the window station name */
    _SEH2_TRY
    {
        ProbeForRead(ObjectAttributes, sizeof(OBJECT_ATTRIBUTES), sizeof(ULONG));
        LocalObjectAttributes = *ObjectAttributes;
        if (LocalObjectAttributes.Length != sizeof(OBJECT_ATTRIBUTES))
        {
            ERR("Invalid ObjectAttributes length!\n");
            Status = STATUS_INVALID_PARAMETER;
            _SEH2_LEAVE;
        }

        /*
         * Check whether the caller did not provide a window station name,
         * or provided the special "Service-0x00000000-00000000$" name.
         *
         * NOTE: On Windows, the special "Service-0x00000000-00000000$" string
         * is used instead of an empty name (observed when API-monitoring
         * OpenWindowStation() called with an empty window station name).
         */
        if ((LocalObjectAttributes.ObjectName == NULL ||
             LocalObjectAttributes.ObjectName->Buffer == NULL ||
             LocalObjectAttributes.ObjectName->Length == 0 ||
             LocalObjectAttributes.ObjectName->Buffer[0] == UNICODE_NULL)
            /* &&
            LocalObjectAttributes.RootDirectory == NULL */)
        {
            /* No, remember that for later */
            LocalObjectAttributes.ObjectName = NULL;
        }
        if (LocalObjectAttributes.ObjectName &&
            LocalObjectAttributes.ObjectName->Length ==
                sizeof(L"Service-0x00000000-00000000$") - sizeof(UNICODE_NULL) &&
            _wcsnicmp(LocalObjectAttributes.ObjectName->Buffer,
                      L"Service-0x00000000-00000000$",
                      LocalObjectAttributes.ObjectName->Length / sizeof(WCHAR)) == 0)
        {
            /* No, remember that for later */
            LocalObjectAttributes.ObjectName = NULL;
        }

        /*
         * If the caller did not provide a window station name, build a new one
         * based on the logon session identifier for the calling process.
         * The new name is allocated in user-mode, as the rest of ObjectAttributes
         * already is, so that the validation performed by the Object Manager
         * can be done adequately.
         */
        if (!LocalObjectAttributes.ObjectName)
        {
            /* No, build the new window station name */
            Status = BuildUserModeWindowStationName(ObjectAttributes,
                                                    &LocalObjectAttributes,
                                                    &WindowStationName,
                                                    &TebStaticUnicodeString);
            if (!NT_SUCCESS(Status))
            {
                ERR("BuildUserModeWindowStationName() failed, Status 0x%08lx\n", Status);
                _SEH2_LEAVE;
            }
            OwnerMode = KernelMode;
        }
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        Status =_SEH2_GetExceptionCode();
        ERR("ObjectAttributes capture failed, Status 0x%08lx\n", Status);
    }
    _SEH2_END;

    if (!NT_SUCCESS(Status))
    {
        SetLastNtError(Status);
        return NULL;
    }

    /* Open the window station */
    Status = ObOpenObjectByName(ObjectAttributes,
                                ExWindowStationObjectType,
                                UserMode,
                                NULL,
                                dwDesiredAccess,
                                NULL,
                                (PVOID*)&hWinSta);
    if (NT_SUCCESS(Status))
    {
        TRACE("NtUserOpenWindowStation opened window station '%wZ' with handle 0x%p\n",
              ObjectAttributes->ObjectName, hWinSta);
    }
    else
    {
        ASSERT(hWinSta == NULL);
        ERR("NtUserOpenWindowStation failed to open window station '%wZ', Status 0x%08lx\n",
            ObjectAttributes->ObjectName, Status);
    }

    /* Try to restore the user's ObjectAttributes and release the window station name */
    FreeUserModeWindowStationName(WindowStationName,
                                  TebStaticUnicodeString,
                                  (OwnerMode == KernelMode ? ObjectAttributes : NULL),
                                  &LocalObjectAttributes);

    if (!NT_SUCCESS(Status))
    {
        ASSERT(hWinSta == NULL);
        SetLastNtError(Status);
    }

    return hWinSta;
}

Referenced by OpenWindowStationW().

NtUserSetLogonNotifyWindow()

BOOL APIENTRY NtUserSetLogonNotifyWindow

(

HWND

hWnd

)

Definition at line 1933 of file winsta.c.

{
    if (gpidLogon != PsGetCurrentProcessId())
    {
        return FALSE;
    }

    if (!IntIsWindow(hWnd))
    {
        return FALSE;
    }

    hwndSAS = hWnd;

    return TRUE;
}

Referenced by SetLogonNotifyWindow().

NtUserSetObjectInformation()

BOOL APIENTRY NtUserSetObjectInformation	(	HANDLE	hObject,
		DWORD	nIndex,
		PVOID	pvInformation,
		DWORD	nLength
	)

Definition at line 1319 of file winsta.c.

{
    /* FIXME: ZwQueryObject */
    /* FIXME: ZwSetInformationObject */
    SetLastNtError(STATUS_UNSUCCESSFUL);
    return FALSE;
}

NtUserSetProcessWindowStation()

BOOL APIENTRY NtUserSetProcessWindowStation

(

HWINSTA

hWindowStation

)

Definition at line 1498 of file winsta.c.

{
    BOOL ret;

    UserEnterExclusive();

    ret = UserSetProcessWindowStation(hWindowStation);

    UserLeave();

    return ret;
}

Referenced by SetProcessWindowStation().

NtUserSetWindowStationUser()

BOOL NTAPI NtUserSetWindowStationUser	(	IN HWINSTA	hWindowStation,
		IN PLUID	pluid,
		IN PSID psid	OPTIONAL,
		IN DWORD	size
	)

Definition at line 1975 of file winsta.c.

{
    BOOL Ret = FALSE;
    NTSTATUS Status;
    PWINSTATION_OBJECT WindowStation = NULL;
    LUID luidUser;

    UserEnterExclusive();

    if (gpidLogon != PsGetCurrentProcessId())
    {
        EngSetLastError(ERROR_ACCESS_DENIED);
        goto Leave;
    }

    /* Validate the window station */
    Status = IntValidateWindowStationHandle(hWindowStation,
                                            UserMode,
                                            0,
                                            &WindowStation,
                                            NULL);
    if (!NT_SUCCESS(Status))
    {
        goto Leave;
    }

    /* Capture the user LUID */
    _SEH2_TRY
    {
        ProbeForRead(pluid, sizeof(LUID), 1);
        luidUser = *pluid;
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        Status = _SEH2_GetExceptionCode();
        _SEH2_YIELD(goto Leave);
    }
    _SEH2_END;

    /* Reset the window station user LUID */
    RtlZeroMemory(&WindowStation->luidUser, sizeof(LUID));

    /* Reset the window station user SID */
    if (WindowStation->psidUser)
    {
        ExFreePoolWithTag(WindowStation->psidUser, USERTAG_SECURITY);
        WindowStation->psidUser = NULL;
    }

    /* Copy the new user SID if one has been provided */
    if (psid)
    {
        WindowStation->psidUser = ExAllocatePoolWithTag(PagedPool, size, USERTAG_SECURITY);
        if (WindowStation->psidUser == NULL)
        {
            EngSetLastError(ERROR_OUTOFMEMORY);
            goto Leave;
        }

        Status = STATUS_SUCCESS;
        _SEH2_TRY
        {
            ProbeForRead(psid, size, 1);
            RtlCopyMemory(WindowStation->psidUser, psid, size);
        }
        _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
        {
            Status = _SEH2_GetExceptionCode();
        }
        _SEH2_END;

        if (!NT_SUCCESS(Status))
        {
            ExFreePoolWithTag(WindowStation->psidUser, USERTAG_SECURITY);
            WindowStation->psidUser = NULL;
            goto Leave;
        }
    }

    /* Copy the new user LUID */
    WindowStation->luidUser = luidUser;

    Ret = TRUE;

Leave:
    if (WindowStation)
        ObDereferenceObject(WindowStation);

    UserLeave();
    return Ret;
}

Referenced by SetWindowStationUser().

NtUserUnlockWindowStation()

BOOL APIENTRY NtUserUnlockWindowStation

(

HWINSTA

hWindowStation

)

Definition at line 1565 of file winsta.c.

{
    PWINSTATION_OBJECT Object;
    NTSTATUS Status;
    BOOL Ret;

    TRACE("About to set process window station with handle (%p)\n",
          hWindowStation);

    if (gpidLogon != PsGetCurrentProcessId())
    {
        ERR("Unauthorized process attempted to unlock the window station!\n");
        EngSetLastError(ERROR_ACCESS_DENIED);
        return FALSE;
    }

    Status = IntValidateWindowStationHandle(hWindowStation,
                                            UserMode,
                                            0,
                                            &Object,
                                            NULL);
    if (!NT_SUCCESS(Status))
    {
        TRACE("Validation of window station handle (%p) failed\n",
              hWindowStation);
        SetLastNtError(Status);
        return FALSE;
    }

    Ret = (Object->Flags & WSS_LOCKED) == WSS_LOCKED;
    Object->Flags &= ~WSS_LOCKED;

    ObDereferenceObject(Object);
    return Ret;
}

Referenced by UnlockWindowStation().

UserCreateWinstaDirectory()

NTSTATUS NTAPI UserCreateWinstaDirectory

(

VOID

)

Definition at line 51 of file winsta.c.

{
    NTSTATUS Status;
    PPEB Peb;
    OBJECT_ATTRIBUTES ObjectAttributes;
    HANDLE hWinstaDir;
    WCHAR wstrWindowStationsDir[MAX_PATH];

    /* Create the WindowStations directory and cache its path for later use */
    Peb = NtCurrentPeb();
    if(Peb->SessionId == 0)
    {
        if (!RtlCreateUnicodeString(&gustrWindowStationsDir, WINSTA_OBJ_DIR))
        {
            return STATUS_INSUFFICIENT_RESOURCES;
        }
    }
    else
    {
        Status = RtlStringCbPrintfW(wstrWindowStationsDir,
                                    sizeof(wstrWindowStationsDir),
                                    L"%ws\\%lu%ws",
                                    SESSION_DIR,
                                    Peb->SessionId,
                                    WINSTA_OBJ_DIR);
        if (!NT_SUCCESS(Status))
            return Status;

        if (!RtlCreateUnicodeString(&gustrWindowStationsDir, wstrWindowStationsDir))
        {
            return STATUS_INSUFFICIENT_RESOURCES;
        }
    }

    InitializeObjectAttributes(&ObjectAttributes,
                               &gustrWindowStationsDir,
                               OBJ_KERNEL_HANDLE,
                               NULL,
                               NULL);
    Status = ZwCreateDirectoryObject(&hWinstaDir, DIRECTORY_CREATE_OBJECT, &ObjectAttributes);
    if (!NT_SUCCESS(Status))
    {
        ERR("Could not create %wZ directory (Status 0x%X)\n", &gustrWindowStationsDir,  Status);
        return Status;
    }

    TRACE("Created directory %wZ for session %lu\n", &gustrWindowStationsDir, Peb->SessionId);

    return Status;
}

Referenced by UserInitialize().

UserGetProcessWindowStation()

HWINSTA FASTCALL UserGetProcessWindowStation

(

VOID

)

Definition at line 1333 of file winsta.c.

{
    PPROCESSINFO ppi = PsGetCurrentProcessWin32Process();

    return ppi->hwinsta;
}

Referenced by IntGetWinStaForCbAccess(), NtUserCloseWindowStation(), and NtUserGetProcessWindowStation().

UserSetProcessWindowStation()

BOOL FASTCALL UserSetProcessWindowStation

(

HWINSTA

hWindowStation

)

Definition at line 1362 of file winsta.c.

{
    NTSTATUS Status;
    PPROCESSINFO ppi;
    OBJECT_HANDLE_INFORMATION ObjectHandleInfo;
    PWINSTATION_OBJECT NewWinSta = NULL, OldWinSta;
    HWINSTA hCacheWinSta;

    ppi = PsGetCurrentProcessWin32Process();

    /* Reference the new window station */
    if (hWindowStation != NULL)
    {
        Status = IntValidateWindowStationHandle(hWindowStation,
                                                UserMode,
                                                0,
                                                &NewWinSta,
                                                &ObjectHandleInfo);
        if (!NT_SUCCESS(Status))
        {
            TRACE("Validation of window station handle 0x%p failed\n", hWindowStation);
            SetLastNtError(Status);
            return FALSE;
        }
    }

    OldWinSta = ppi->prpwinsta;
    hCacheWinSta = PsGetProcessWin32WindowStation(ppi->peProcess);

    /* Dereference the previous window station */
    if (OldWinSta != NULL)
    {
        ObDereferenceObject(OldWinSta);
    }

    /*
     * FIXME: Don't allow changing the window station if there are threads that are attached to desktops and own GUI objects?
     */

    /* Close the cached EPROCESS window station handle if needed */
    if (hCacheWinSta != NULL)
    {
        /* Reference the window station */
        Status = ObReferenceObjectByHandle(hCacheWinSta,
                                           0,
                                           ExWindowStationObjectType,
                                           UserMode,
                                           (PVOID*)&OldWinSta,
                                           NULL);
        if (!NT_SUCCESS(Status))
        {
            ERR("Failed to reference the inherited window station, Status 0x%08lx\n", Status);
            /* We failed, reset the cache */
            hCacheWinSta = NULL;
            PsSetProcessWindowStation(ppi->peProcess, hCacheWinSta);
        }
        else
        {
            /*
             * Close the old handle and reset the cache only
             * if we are setting a different window station.
             */
            if (NewWinSta != OldWinSta)
            {
                ObCloseHandle(hCacheWinSta, UserMode);
                hCacheWinSta = NULL;
                PsSetProcessWindowStation(ppi->peProcess, hCacheWinSta);
            }

            /* Dereference the window station */
            ObDereferenceObject(OldWinSta);
        }
    }

    /* Duplicate and save a new cached EPROCESS window station handle */
    if ((hCacheWinSta == NULL) && (hWindowStation != NULL))
    {
        Status = ZwDuplicateObject(ZwCurrentProcess(),
                                   hWindowStation,
                                   ZwCurrentProcess(),
                                   (PHANDLE)&hCacheWinSta,
                                   0,
                                   0,
                                   DUPLICATE_SAME_ACCESS);
        if (!NT_SUCCESS(Status))
        {
            ERR("UserSetProcessWindowStation: Failed to duplicate the window station handle, Status 0x%08lx\n", Status);
        }
        else
        {
            PsSetProcessWindowStation(ppi->peProcess, hCacheWinSta);
        }
    }

    ppi->prpwinsta = NewWinSta;
    ppi->hwinsta = hWindowStation;
    ppi->amwinsta = hWindowStation != NULL ? ObjectHandleInfo.GrantedAccess : 0;
    TRACE("WS : Granted Access 0x%08lx\n",ppi->amwinsta);

    if (RtlAreAllAccessesGranted(ppi->amwinsta, WINSTA_READSCREEN))
    {
        ppi->W32PF_flags |= W32PF_READSCREENACCESSGRANTED;
    }
    else
    {
        ppi->W32PF_flags &= ~W32PF_READSCREENACCESSGRANTED;
    }

    if (NewWinSta && !(NewWinSta->Flags & WSS_NOIO))
    {
        ppi->W32PF_flags |= W32PF_IOWINSTA;
    }
    else /* Might be closed if the handle is NULL */
    {
        ppi->W32PF_flags &= ~W32PF_IOWINSTA;
    }
    return TRUE;
}

Referenced by InitThreadCallback(), NtUserSetProcessWindowStation(), RawInputThreadMain(), and UserProcessDestroy().

Variable Documentation

gustrWindowStationsDir

UNICODE_STRING gustrWindowStationsDir

Definition at line 27 of file winsta.c.

Referenced by BuildUserModeWindowStationName(), BuildWindowStationNameList(), IntResolveDesktop(), and UserCreateWinstaDirectory().

hwndSAS

HWND hwndSAS = NULL

Definition at line 24 of file winsta.c.

Referenced by DefWndHandleSetCursor(), DefWndHandleSysCommand(), DoTheScreenSaver(), ExitThreadCallback(), IntDefWindowProc(), MENU_TrackKbdMenuBar(), MENU_TrackMenu(), NotifyLogon(), NtUserCallOneParam(), NtUserLockWorkStation(), NtUserSetLogonNotifyWindow(), RegisterHotKeys(), UnregisterHotKeys(), UserEndShutdown(), and UserInitiateShutdown().

InputWindowStation

PWINSTATION_OBJECT InputWindowStation = NULL

Definition at line 21 of file winsta.c.

Referenced by co_UserProcessHotKeys(), InitThreadCallback(), IntCreateWindowStation(), IntResolveDesktop(), IntWinStaObjectDelete(), NtUserMessageCall(), NtUserSwitchDesktop(), RawInputThreadMain(), and UserOpenInputDesktop().