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[FLTMGR] Add a bit more basic code layout for filter registration

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Needs implementing
This commit is contained in:
Ged Murphy 2018-10-29 17:03:11 +00:00 committed by Pierre Schweitzer
parent 97066b792c
commit fa46f362ea
2 changed files with 81 additions and 13 deletions
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89
drivers/filters/fltmgr/Filter.c
View file

@ -21,6 +21,9 @@
#define SERVICES_KEY L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\"
#define MAX_KEY_LENGTH 0x200
LIST_ENTRY FilterList;
ERESOURCE FilterListLock;
NTSTATUS
FltpStartingToDrainObject(
_Inout_ PFLT_OBJECT Object
@ -30,6 +33,12 @@ VOID
FltpMiniFilterDriverUnload(
);
NTSTATUS
FltpAttachFrame(
_In_ PUNICODE_STRING Altitude,
_Inout_ PFLTP_FRAME *Frame
);
static
NTSTATUS
GetFilterAltitude(
@ -37,6 +46,14 @@ GetFilterAltitude(
_Inout_ PUNICODE_STRING AltitudeString
);
static
NTSTATUS
GetFilterFrame(
_In_ PFLT_FILTER Filter,
_In_ PUNICODE_STRING Altitude,
_Out_ PFLTP_FRAME *Frame
);
/* EXPORTED FUNCTIONS ******************************************************/
@ -98,6 +115,7 @@ FltRegisterFilter(_In_ PDRIVER_OBJECT DriverObject,
{
PFLT_OPERATION_REGISTRATION Callbacks;
PFLT_FILTER Filter;
PFLTP_FRAME Frame;
ULONG CallbackBufferSize;
ULONG FilterBufferSize;
ULONG Count = 0;
@ -235,12 +253,28 @@ FltRegisterFilter(_In_ PDRIVER_OBJECT DriverObject,
Filter->Name.Buffer = (PWCH)Ptr;
RtlCopyUnicodeString(&Filter->Name, &DriverObject->DriverExtension->ServiceKeyName);
/* Lookup the altitude of the mini-filter */
Status = GetFilterAltitude(Filter, &Filter->DefaultAltitude);
if (!NT_SUCCESS(Status))
{
goto Quit;
}
/* Lookup the filter frame */
Status = GetFilterFrame(Filter, &Filter->DefaultAltitude, &Frame);
if (Status == STATUS_NOT_FOUND)
{
/* Store the frame this mini-filter's main struct */
Filter->Frame = Frame;
Status = FltpAttachFrame(&Filter->DefaultAltitude, &Frame);
}
if (!NT_SUCCESS(Status))
{
goto Quit;
}
//
// - Slot the filter into the correct altitude location
// - More stuff??
@ -364,6 +398,17 @@ FltStartFiltering(_In_ PFLT_FILTER Filter)
return Status;
}
NTSTATUS
NTAPI
FltGetFilterFromName(_In_ PCUNICODE_STRING FilterName,
_Out_ PFLT_FILTER *RetFilter)
{
UNIMPLEMENTED;
UNREFERENCED_PARAMETER(FilterName);
*RetFilter = NULL;
return STATUS_NOT_IMPLEMENTED;
}
/* INTERNAL FUNCTIONS ******************************************************/
@ -389,13 +434,24 @@ FltpMiniFilterDriverUnload()
__debugbreak();
}
NTSTATUS
FltpAttachFrame(
_In_ PUNICODE_STRING Altitude,
_Inout_ PFLTP_FRAME *Frame)
{
UNIMPLEMENTED;
UNREFERENCED_PARAMETER(Altitude);
*Frame = NULL;
return STATUS_SUCCESS;
}
/* PRIVATE FUNCTIONS ******************************************************/
static
NTSTATUS
GetFilterAltitude(
_In_ PFLT_FILTER Filter,
_Inout_ PUNICODE_STRING AltitudeString)
GetFilterAltitude(_In_ PFLT_FILTER Filter,
_Inout_ PUNICODE_STRING AltitudeString)
{
UNICODE_STRING InstancesKey = RTL_CONSTANT_STRING(L"Instances");
UNICODE_STRING DefaultInstance = RTL_CONSTANT_STRING(L"DefaultInstance");
@ -523,14 +579,21 @@ Quit:
return Status;
}
static
NTSTATUS
FltpReadRegistryValue(
_In_ HANDLE KeyHandle,
_In_ PUNICODE_STRING ValueName,
_In_opt_ ULONG Type,
_Out_writes_bytes_(BufferSize) PVOID Buffer,
_In_ ULONG BufferSize,
_Out_opt_ PULONG BytesRequired
);
GetFilterFrame(_In_ PFLT_FILTER Filter,
_In_ PUNICODE_STRING Altitude,
_Out_ PFLTP_FRAME *Frame)
{
UNIMPLEMENTED;
UNREFERENCED_PARAMETER(Filter);
UNREFERENCED_PARAMETER(Altitude);
//
// Try to find a frame from our existing filter list (see FilterList)
// If none exists, create a new frame, add it and return it
//
*Frame = NULL;
return STATUS_SUCCESS;
}

5
drivers/filters/fltmgr/Interface.c
View file

@ -29,6 +29,8 @@
((_devObj)->DeviceExtension != NULL))
extern PDEVICE_OBJECT CommsDeviceObject;
extern LIST_ENTRY FilterList;
extern ERESOURCE FilterListLock;
DRIVER_INITIALIZE DriverEntry;
@ -2129,6 +2131,9 @@ DriverEntry(_In_ PDRIVER_OBJECT DriverObject,
FLT_ASSERT(Status != STATUS_DEVICE_ALREADY_ATTACHED); // Windows checks for this, I'm not sure how it can happen. Needs investigation??
if (!NT_SUCCESS(Status)) goto Cleanup;
InitializeListHead(&FilterList);
ExInitializeResourceLite(&FilterListLock);
/* IoRegisterFsRegistrationChange isn't notified about the raw file systems, so we attach to them manually */
RtlInitUnicodeString(&ObjectName, L"\\Device\\RawDisk");
Status = IoGetDeviceObjectPointer(&ObjectName,