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| #include "Common.h"
#include "Helper.h"
#include "Config.h"
#define DWORD unsigned long
#define WORD unsigned short
#define BOOL unsigned long
#define CURRENT_PROCESS_TAG 'cpnt'
#define FULL_PATH_TAG 'fpnt'
#define VOLUME_TAG 'vnt'
FLT_POSTOP_CALLBACK_STATUS PostFileOperationCallback ( IN OUT PFLT_CALLBACK_DATA Data,
IN PCFLT_RELATED_OBJECTS FltObjects,
IN PVOID CompletionContext,
IN FLT_POST_OPERATION_FLAGS Flags);
FLT_PREOP_CALLBACK_STATUS
PreFileOperationCallback (
__inout PFLT_CALLBACK_DATA Data,
__in PCFLT_RELATED_OBJECTS FltObjects,
__deref_out_opt PVOID *CompletionContext
);
NTSTATUS FilterUnload ( IN FLT_FILTER_UNLOAD_FLAGS Flags );
NTSTATUS FilterLoad (IN PCFLT_RELATED_OBJECTS FltObjects,
IN FLT_INSTANCE_SETUP_FLAGS Flags,
IN DEVICE_TYPE VolumeDeviceType,
IN FLT_FILESYSTEM_TYPE VolumeFilesystemType);
typedef struct _MINIFILTER
{
PDRIVER_OBJECT pDriverObject;
PFLT_FILTER pFilter;
} MINIFILTER, *PMINIFILTER;
const FLT_OPERATION_REGISTRATION Callbacks[] = {
{ IRP_MJ_CREATE,
0,
PreFileOperationCallback,
PostFileOperationCallback },
{ IRP_MJ_OPERATION_END }
};
const FLT_CONTEXT_REGISTRATION Contexts[] = {
{ FLT_CONTEXT_END }
};
CONST FLT_REGISTRATION FilterRegistration = {
sizeof( FLT_REGISTRATION ), // Size
FLT_REGISTRATION_VERSION, // Version
0, // Flags
Contexts, // Context
Callbacks, // Operation callbacks
FilterUnload, // FilterUnload
FilterLoad, // InstanceSetup
NULL, // InstanceQueryTeardown
NULL, // InstanceTeardownStart
NULL, // InstanceTeardownComplete
NULL, // GenerateFileName
NULL // NormalizeNameComponent
};
MINIFILTER fileManager;
NTSTATUS FilterLoad (IN PCFLT_RELATED_OBJECTS FltObjects,
IN FLT_INSTANCE_SETUP_FLAGS Flags,
IN DEVICE_TYPE VolumeDeviceType,
IN FLT_FILESYSTEM_TYPE VolumeFilesystemType)
{
if (VolumeDeviceType == FILE_DEVICE_NETWORK_FILE_SYSTEM) {
return STATUS_FLT_DO_NOT_ATTACH;
}
return STATUS_SUCCESS;
}
NTSTATUS FilterUnload ( IN FLT_FILTER_UNLOAD_FLAGS Flags )
{
return STATUS_SUCCESS;
}
PWCHAR wcssplt(PWCHAR str, PWCHAR substr)
{
PWCHAR result = NULL;
PWCHAR subStPos = wcswcs(str, substr);
if(subStPos != 0)
{
int pos = subStPos - str;
result = (PWCHAR)ExAllocatePoolWithTag(NonPagedPool ,sizeof(WCHAR)*pos + sizeof(UNICODE_NULL), VOLUME_TAG);
RtlCopyMemory(result, str, sizeof(WCHAR)*pos);
*(result+pos) = UNICODE_NULL;
}
return result;
}
FLT_PREOP_CALLBACK_STATUS
PreFileOperationCallback (
__inout PFLT_CALLBACK_DATA Data,
__in PCFLT_RELATED_OBJECTS FltObjects,
__deref_out_opt PVOID *CompletionContext
)
{
NTSTATUS status;
PFILE_OBJECT FileObject;
PFileRedirectRule redirectRuleItem;
PFLT_FILE_NAME_INFORMATION pFileNameInformation;
PConfigurationMap rule;
UNICODE_STRING fullPath;
UNICODE_STRING processName;
PWCHAR Volume;
FLT_PREOP_CALLBACK_STATUS returnStatus = FLT_PREOP_SUCCESS_NO_CALLBACK;
/* If this is a callback for a FS Filter driver then we ignore the event */
if(FLT_IS_FS_FILTER_OPERATION(Data))
{
return FLT_PREOP_SUCCESS_NO_CALLBACK;
}
if (FltObjects->FileObject != NULL && Data != NULL) {
FileObject = Data->Iopb->TargetFileObject;
if(FileObject != NULL && Data->Iopb->MajorFunction == IRP_MJ_CREATE)
{
processName.Length = 0;
processName.MaximumLength = NTSTRSAFE_UNICODE_STRING_MAX_CCH * sizeof(WCHAR);
processName.Buffer = ExAllocatePoolWithTag(NonPagedPool, processName.MaximumLength,CURRENT_PROCESS_TAG);
RtlZeroMemory(processName.Buffer, processName.MaximumLength);
status = GetProcessImageName(&processName);
if(NT_SUCCESS(status))
{
if(LoggingEnabled()== 1)
{
DbgPrint("MiniFilter: Process: %ws", processName.Buffer);
}
}
else
{
return FLT_PREOP_SUCCESS_NO_CALLBACK;
}
rule = FindRuleByProcessName(&processName,GetConfigurationMap());
ExFreePool(processName.Buffer);
if(rule != NULL){
if(LoggingEnabled() == 1)
{
DbgPrint("MiniFilter: File name %ws", FileObject->FileName.Buffer);
}
redirectRuleItem = rule->ProcessRule.Rule;
while(redirectRuleItem)
{
if(RtlCompareUnicodeString(&FileObject->FileName ,&redirectRuleItem->From, FALSE) == 0)
{
status = FltGetFileNameInformation( Data,
FLT_FILE_NAME_NORMALIZED |
FLT_FILE_NAME_QUERY_ALWAYS_ALLOW_CACHE_LOOKUP,
&pFileNameInformation );
if(NT_SUCCESS(status))
{
fullPath.Length = 0;
fullPath.MaximumLength = NTSTRSAFE_UNICODE_STRING_MAX_CCH * sizeof(WCHAR);
fullPath.Buffer = ExAllocatePoolWithTag(NonPagedPool, fullPath.MaximumLength, FULL_PATH_TAG);
RtlZeroMemory(fullPath.Buffer, fullPath.MaximumLength);
Volume = wcssplt(pFileNameInformation->Volume.Buffer, redirectRuleItem->From.Buffer );
RtlAppendUnicodeToString(&fullPath, Volume);
RtlAppendUnicodeToString(&fullPath, redirectRuleItem->To.Buffer);
ExFreePool(Volume);
ExFreePool(FileObject->FileName.Buffer);
FileObject->FileName.Length = fullPath.Length;
FileObject->FileName.MaximumLength = fullPath.MaximumLength;
FileObject->FileName.Buffer = fullPath.Buffer;
Data->Iopb->TargetFileObject->RelatedFileObject = NULL;
Data->IoStatus.Information = IO_REPARSE;
Data->IoStatus.Status = STATUS_ACCESS_DENIED;
DbgPrint("MiniFilter: Redirect done according the rule to %ws", fullPath.Buffer);
return FLT_PREOP_COMPLETE;
}
}
redirectRuleItem = redirectRuleItem->NextRule;
}
}
}
}
return FLT_PREOP_SUCCESS_NO_CALLBACK;
}
FLT_POSTOP_CALLBACK_STATUS PostFileOperationCallback ( IN OUT PFLT_CALLBACK_DATA Data,
IN PCFLT_RELATED_OBJECTS FltObjects,
IN PVOID CompletionContext,
IN FLT_POST_OPERATION_FLAGS Flags)
{
return FLT_POSTOP_FINISHED_PROCESSING;
}
//////////////////////////////////////////////////////////////
/* This device driver doesn't service I/O requests, so we provide only
a dummy I/O dispatch routine. */
NTSTATUS
OnStubDispatch(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
{
Irp->IoStatus.Status = STATUS_ACCESS_DENIED;
IoCompleteRequest (Irp,
IO_NO_INCREMENT
);
return Irp->IoStatus.Status;
}
VOID OnUnload( IN PDRIVER_OBJECT DriverObject )
{
FltUnregisterFilter(fileManager.pFilter);
FreeConfigInfo();
DbgPrint("MiniFilter: Unloaded");
}
NTSTATUS DriverEntry( IN PDRIVER_OBJECT theDriverObject, IN PUNICODE_STRING theRegistryPath )
{
int i;
NTSTATUS status;
PCHAR ConfigInfo;
UNICODE_STRING test;
DbgPrint("MiniFilter: Started.");
// Register a dispatch function
for (i = 0; i < IRP_MJ_MAXIMUM_FUNCTION; i++)
{
theDriverObject->MajorFunction[i] = OnStubDispatch;
}
theDriverObject->DriverUnload = OnUnload;
fileManager.pDriverObject = theDriverObject;
status = FltRegisterFilter(theDriverObject, &FilterRegistration, &fileManager.pFilter);
if (!NT_SUCCESS(status))
{
DbgPrint("MiniFilter: Driver not started. ERROR FltRegisterFilter - %08x\n", status);
return status;
}
ConfigInfo = ReadConfigurationFile();
if(ConfigInfo != NULL && NT_SUCCESS(ParseConfigurationFile(ConfigInfo)))
{
ExFreePool(ConfigInfo);
DbgPrint("MiniFilter: Configuration finished.");
}else
{
if(ConfigInfo != NULL)ExFreePool(ConfigInfo);
FltUnregisterFilter( fileManager.pFilter );
DbgPrint("MiniFilter: Driver configuration was failed. Driver not started.");
return STATUS_DEVICE_CONFIGURATION_ERROR;
}
status = FltStartFiltering( fileManager.pFilter );
if (!NT_SUCCESS( status )) {
FltUnregisterFilter( fileManager.pFilter );
FreeConfigInfo();
DbgPrint("MiniFilter: Driver not started. ERROR FltStartFiltering - %08x\n", status);
return status;
}
DbgPrint("MiniFilter: Filter was started and configured.");
return STATUS_SUCCESS;
} |