/* GLOBALS *******************************************************************/
-/* Currently active window station */
+/*
+ * The currently active window station. This is the
+ * only one interactive window station on the system.
+ */
PWINSTATION_OBJECT InputWindowStation = NULL;
/* Winlogon SAS window */
return Status;
}
-/* OBJECT CALLBACKS **********************************************************/
+/* OBJECT CALLBACKS ***********************************************************/
NTSTATUS
NTAPI
PWIN32_DELETEMETHOD_PARAMETERS DeleteParameters = Parameters;
PWINSTATION_OBJECT WinSta = (PWINSTATION_OBJECT)DeleteParameters->Object;
- TRACE("Deleting window station (0x%p)\n", WinSta);
+ 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;
ppi = PsGetCurrentProcessWin32Process();
- if(ppi && (OkToCloseParameters->Handle == ppi->hwinsta))
+ if (ppi && (OkToCloseParameters->Handle == ppi->hwinsta))
{
return STATUS_ACCESS_DENIED;
}
OUT HWINSTA* phWinSta,
IN POBJECT_ATTRIBUTES ObjectAttributes,
IN KPROCESSOR_MODE AccessMode,
+ IN KPROCESSOR_MODE OwnerMode,
IN ACCESS_MASK dwDesiredAccess,
DWORD Unknown2,
DWORD Unknown3,
DWORD Unknown6)
{
NTSTATUS Status;
- HWINSTA WindowStation;
- PWINSTATION_OBJECT WindowStationObject;
+ HWINSTA hWinSta;
+ PWINSTATION_OBJECT WindowStation;
TRACE("IntCreateWindowStation called\n");
NULL,
dwDesiredAccess,
NULL,
- (PVOID*)&WindowStation);
+ (PVOID*)&hWinSta);
if (NT_SUCCESS(Status))
{
- TRACE("IntCreateWindowStation opened window station %wZ\n",
+ TRACE("IntCreateWindowStation opened window station '%wZ'\n",
ObjectAttributes->ObjectName);
- *phWinSta = WindowStation;
+ *phWinSta = hWinSta;
return Status;
}
/*
- * No existing window station found, try to create new one.
+ * No existing window station found, try to create a new one.
*/
/* Create the window station object */
- Status = ObCreateObject(KernelMode,
+ Status = ObCreateObject(AccessMode,
ExWindowStationObjectType,
ObjectAttributes,
- AccessMode,
+ OwnerMode,
NULL,
sizeof(WINSTATION_OBJECT),
0,
0,
- (PVOID*)&WindowStationObject);
+ (PVOID*)&WindowStation);
if (!NT_SUCCESS(Status))
{
- ERR("ObCreateObject failed with %lx for window station %wZ\n",
- Status, ObjectAttributes->ObjectName);
+ ERR("ObCreateObject failed for window station '%wZ', Status 0x%08lx\n",
+ ObjectAttributes->ObjectName, Status);
SetLastNtError(Status);
return Status;
}
/* Initialize the window station */
- RtlZeroMemory(WindowStationObject, sizeof(WINSTATION_OBJECT));
+ RtlZeroMemory(WindowStation, sizeof(WINSTATION_OBJECT));
- InitializeListHead(&WindowStationObject->DesktopListHead);
- WindowStationObject->dwSessionId = NtCurrentPeb()->SessionId;
- Status = RtlCreateAtomTable(37, &WindowStationObject->AtomTable);
+ InitializeListHead(&WindowStation->DesktopListHead);
+ WindowStation->dwSessionId = NtCurrentPeb()->SessionId;
+ Status = RtlCreateAtomTable(37, &WindowStation->AtomTable);
if (!NT_SUCCESS(Status))
{
- ERR("RtlCreateAtomTable failed with %lx for window station %wZ\n", Status, ObjectAttributes->ObjectName);
- ObDereferenceObject(WindowStationObject);
+ ERR("RtlCreateAtomTable failed for window station '%wZ', Status 0x%08lx\n",
+ ObjectAttributes->ObjectName, Status);
+ ObDereferenceObject(WindowStation);
SetLastNtError(Status);
return Status;
}
- Status = ObInsertObject(WindowStationObject,
+ Status = ObInsertObject(WindowStation,
NULL,
dwDesiredAccess,
0,
NULL,
- (PVOID*)&WindowStation);
+ (PVOID*)&hWinSta);
if (!NT_SUCCESS(Status))
{
- ERR("ObInsertObject failed with %lx for window station\n", Status);
+ ERR("ObInsertObject failed for window station, Status 0x%08lx\n", Status);
SetLastNtError(Status);
return Status;
}
if (InputWindowStation == NULL)
{
ERR("Initializing input window station\n");
- InputWindowStation = WindowStationObject;
- WindowStationObject->Flags &= ~WSS_NOIO;
+ /* Only Winlogon can create the interactive window station */
+ ASSERT(gpidLogon == PsGetCurrentProcessId());
+ InputWindowStation = WindowStation;
+ WindowStation->Flags &= ~WSS_NOIO;
InitCursorImpl();
}
else
{
- WindowStationObject->Flags |= WSS_NOIO;
+ WindowStation->Flags |= WSS_NOIO;
}
- TRACE("IntCreateWindowStation created object 0x%p with name %wZ handle 0x%p\n",
- WindowStationObject, ObjectAttributes->ObjectName, WindowStation);
+ TRACE("IntCreateWindowStation created window station '%wZ' object 0x%p handle 0x%p\n",
+ ObjectAttributes->ObjectName, WindowStation, hWinSta);
- *phWinSta = WindowStation;
+ *phWinSta = hWinSta;
return STATUS_SUCCESS;
}
+static VOID
+FreeUserModeWindowStationName(
+ IN OUT PUNICODE_STRING WindowStationName,
+ IN PUNICODE_STRING TebStaticUnicodeString,
+ IN OUT POBJECT_ATTRIBUTES UserModeObjectAttributes OPTIONAL,
+ IN POBJECT_ATTRIBUTES LocalObjectAttributes OPTIONAL)
+{
+ 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);
+ }
+}
+
+static NTSTATUS
+BuildUserModeWindowStationName(
+ IN OUT POBJECT_ATTRIBUTES UserModeObjectAttributes,
+ IN OUT POBJECT_ATTRIBUTES LocalObjectAttributes,
+ OUT PUNICODE_STRING* WindowStationName,
+ OUT PUNICODE_STRING* TebStaticUnicodeString)
+{
+ 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;
+}
+
HWINSTA
APIENTRY
NtUserCreateWindowStation(
DWORD Unknown5,
DWORD Unknown6)
{
- NTSTATUS Status;
- HWINSTA hWinSta;
+ NTSTATUS Status = STATUS_SUCCESS;
+ HWINSTA hWinSta = NULL;
OBJECT_ATTRIBUTES LocalObjectAttributes;
- UNICODE_STRING WindowStationName;
- KPROCESSOR_MODE AccessMode = UserMode;
+ PUNICODE_STRING WindowStationName = NULL;
+ PUNICODE_STRING TebStaticUnicodeString = NULL;
+ KPROCESSOR_MODE OwnerMode = UserMode;
TRACE("NtUserCreateWindowStation called\n");
- /* Capture window station name */
+ /* Capture the object attributes and the window station name */
_SEH2_TRY
{
ProbeForRead(ObjectAttributes, sizeof(OBJECT_ATTRIBUTES), sizeof(ULONG));
LocalObjectAttributes = *ObjectAttributes;
- if (LocalObjectAttributes.ObjectName ||
- LocalObjectAttributes.RootDirectory
- /* &&
- LocalObjectAttributes.ObjectName->Buffer &&
- LocalObjectAttributes.ObjectName->Length > 0 */)
+ if (LocalObjectAttributes.Length != sizeof(OBJECT_ATTRIBUTES))
{
- Status = IntSafeCopyUnicodeStringTerminateNULL(&WindowStationName,
- LocalObjectAttributes.ObjectName);
- LocalObjectAttributes.ObjectName = &WindowStationName;
+ ERR("Invalid ObjectAttributes length!\n");
+ Status = STATUS_INVALID_PARAMETER;
+ _SEH2_LEAVE;
}
- else
+
+ /*
+ * 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 */)
{
- LocalObjectAttributes.ObjectName = NULL;
- Status = STATUS_SUCCESS;
+ /* 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
+ _SEH2_END;
if (!NT_SUCCESS(Status))
{
- ERR("Failed reading or capturing window station name, Status 0x%08lx\n", Status);
SetLastNtError(Status);
return 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.
- */
- if (!LocalObjectAttributes.ObjectName)
- {
- LUID CallerLuid;
- WCHAR ServiceWinStaName[MAX_PATH];
-
- /* Retrieve the LUID of the current process */
- Status = GetProcessLuid(NULL, NULL, &CallerLuid);
- if (!NT_SUCCESS(Status))
- {
- ERR("Failed to retrieve the caller LUID, Status 0x%08lx\n", Status);
- SetLastNtError(Status);
- return NULL;
- }
-
- /* Build a valid window station name from the LUID */
- Status = RtlStringCbPrintfW(ServiceWinStaName,
- sizeof(ServiceWinStaName),
- 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);
- SetLastNtError(Status);
- return NULL;
- }
-
- RtlInitUnicodeString(&WindowStationName, ServiceWinStaName);
- LocalObjectAttributes.ObjectName = &WindowStationName;
- AccessMode = KernelMode;
- }
-
- // TODO: Capture and use the SecurityQualityOfService!
-
+ /* Create the window station */
Status = IntCreateWindowStation(&hWinSta,
- &LocalObjectAttributes,
- AccessMode,
+ ObjectAttributes,
+ UserMode,
+ OwnerMode,
dwDesiredAccess,
Unknown2,
Unknown3,
Unknown4,
Unknown5,
Unknown6);
-
- if ((AccessMode == UserMode) && LocalObjectAttributes.ObjectName)
- ExFreePoolWithTag(LocalObjectAttributes.ObjectName->Buffer, TAG_STRING);
-
if (NT_SUCCESS(Status))
{
- TRACE("NtUserCreateWindowStation created a window station with handle 0x%p\n", hWinSta);
+ TRACE("NtUserCreateWindowStation created window station '%wZ' with handle 0x%p\n",
+ ObjectAttributes->ObjectName, hWinSta);
}
else
{
ASSERT(hWinSta == NULL);
- TRACE("NtUserCreateWindowStation failed to create a window station!\n");
+ 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;
* @implemented
*/
-HWINSTA APIENTRY
+HWINSTA
+APIENTRY
NtUserOpenWindowStation(
- POBJECT_ATTRIBUTES ObjectAttributes,
- ACCESS_MASK dwDesiredAccess)
+ IN POBJECT_ATTRIBUTES ObjectAttributes,
+ IN ACCESS_MASK dwDesiredAccess)
{
- HWINSTA hwinsta;
- NTSTATUS Status;
+ 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);
+ (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))
{
- ERR("NtUserOpenWindowStation failed\n");
+ ASSERT(hWinSta == NULL);
SetLastNtError(Status);
- return 0;
}
- TRACE("Opened window station %wZ with handle %p\n", ObjectAttributes->ObjectName, hwinsta);
-
- return hwinsta;
+ return hWinSta;
}
/*
*
* Remarks
* The window station handle can be created with NtUserCreateWindowStation
- * or NtUserOpenWindowStation. Attemps to close a handle to the window
+ * or NtUserOpenWindowStation. Attempts to close a handle to the window
* station assigned to the calling process will fail.
*
* Status
return Ret;
}
-
/* EOF */
projects / reactos.git / commitdiff