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X70FsdCreate.c
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X70FsdCreate.c
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/*
驱动暂时用hashtable来做fcb的存贮，以后准备换成splay tree
*/
#include"X70FSDCreate.h"
#include"X70FsdData.h"
#include"X70FsdSupport.h"
#include"X70FsdInterface.h"
extern LARGE_INTEGER Li0;
extern NPAGED_LOOKASIDE_LIST G_FcbLookasideList;
extern NPAGED_LOOKASIDE_LIST G_CcbLookasideList;
extern NPAGED_LOOKASIDE_LIST G_EResourceLookasideList;
extern USHORT gOsServicePackMajor;
extern ULONG gOsMajorVersion;
extern ULONG gOsMinorVersion;
extern DYNAMIC_FUNCTION_POINTERS gDynamicFunctions;
//#define MAX_NTFS_METADATA_FILE 11
//WCHAR *NtfsMetadataFileNames[] = {
// L"$Mft",
// L"$MftMirr",
// L"$LogFile",
// L"$Volume",
// L"$AttrDef",
// L"$Root",
// L"$Bitmap",
// L"$Boot",
// L"$BadClus",
// L"$Secure",
// L"$UpCase",
// L"$Extend"
//}; //NTFS元数据不能加密
BOOLEAN IsConcernedProcess( PCFLT_RELATED_OBJECTS FltObjects,PNTSTATUS pStatus,PULONG ProcType)
{
PEPROCESS Eprocess = NULL;
HANDLE Pid;
BOOLEAN bParentProcessLicense = FALSE;
*pStatus = STATUS_SUCCESS;
return IsTestProcess(pStatus,ProcType);
}
FLT_POSTOP_CALLBACK_STATUS
PtPostOperationNetworkQueryOpen(
__inout PFLT_CALLBACK_DATA Data,
__in PCFLT_RELATED_OBJECTS FltObjects,
__in_opt PVOID CompletionContext,
__in FLT_POST_OPERATION_FLAGS Flags
)
{
UNREFERENCED_PARAMETER( Data );
UNREFERENCED_PARAMETER( FltObjects );
UNREFERENCED_PARAMETER( CompletionContext );
UNREFERENCED_PARAMETER( Flags );
return FLT_POSTOP_FINISHED_PROCESSING;
}
FLT_PREOP_CALLBACK_STATUS
PtPreOperationNetworkQueryOpen(
__inout PFLT_CALLBACK_DATA Data,
__in PCFLT_RELATED_OBJECTS FltObjects,
__deref_out_opt PVOID *CompletionContext
)
{
ULONG ProcType = 0;
NTSTATUS Status;
if(IsMyFakeFcb(FltObjects->FileObject) || IsConcernedProcess(FltObjects,&Status,&ProcType))
{
return FLT_PREOP_DISALLOW_FASTIO;
}
return FLT_PREOP_SUCCESS_NO_CALLBACK;
}
BOOLEAN IsConcernedCreateOptions(__inout PFLT_CALLBACK_DATA Data)
{
PFLT_IO_PARAMETER_BLOCK CONST Iopb = Data->Iopb;
ULONG Options = Iopb->Parameters.Create.Options;
BOOLEAN DirectoryFile = BooleanFlagOn( Options, FILE_DIRECTORY_FILE ); //目录文件
return !DirectoryFile;
}
#define FILE_OPEN_REQUIRING_OPLOCK 0x00010000
NTSTATUS CreateFileImitation(__inout PFLT_CALLBACK_DATA Data,
__in PCFLT_RELATED_OBJECTS FltObjects,
__in PUNICODE_STRING FileName,
__out PHANDLE phFile,
__out PFILE_OBJECT * pFileObject,
__out PIO_STATUS_BLOCK IoStatus,
__in BOOLEAN Network)
{
NTSTATUS Status;
OBJECT_ATTRIBUTES ob;
PFLT_IO_PARAMETER_BLOCK CONST Iopb = Data->Iopb;
LARGE_INTEGER AllocationSize ;
ACCESS_MASK DesiredAccess ;
ULONG EaLength;
PVOID EaBuffer;
ULONG Options;
ULONG CreateDisposition;
ULONG FileAttributes;
ULONG ShareAccess;
ULONG Flags = 0;
PSECURITY_DESCRIPTOR SecurityDescriptor = NULL;
UNREFERENCED_PARAMETER( FltObjects );
SecurityDescriptor = Iopb->Parameters.Create.SecurityContext->AccessState->SecurityDescriptor;
AllocationSize.QuadPart = Iopb->Parameters.Create.AllocationSize.QuadPart;
EaBuffer = Iopb->Parameters.Create.EaBuffer;
DesiredAccess = Iopb->Parameters.Create.SecurityContext->DesiredAccess ;
Options = Iopb->Parameters.Create.Options;
FileAttributes = Iopb->Parameters.Create.FileAttributes;
ShareAccess = Iopb->Parameters.Create.ShareAccess;
EaLength = Iopb->Parameters.Create.EaLength;
if(Network)
{
//SetFlag (ShareAccess ,FILE_SHARE_READ);
//SetFlag (DesiredAccess ,FILE_READ_DATA );
//SetFlag (DesiredAccess , FILE_WRITE_DATA); //???
ShareAccess = FILE_SHARE_READ; //网络文件因为oplock，只能只读，要想解决去参考rdbss.sys
ClearFlag(DesiredAccess,FILE_WRITE_DATA);
ClearFlag(DesiredAccess,FILE_APPEND_DATA);
}
#ifdef USE_CACHE_READWRITE
SetFlag(Options,FILE_WRITE_THROUGH); //如果缓存写需要加上直接写入文件，否则cccaniwrite内部会导致等待pagingio产生死锁
#endif
ClearFlag(Options,FILE_OPEN_BY_FILE_ID);
ClearFlag(Options,FILE_OPEN_REQUIRING_OPLOCK);
CreateDisposition = (Options >> 24) & 0x000000ff;
InitializeObjectAttributes(&ob, FileName,OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE , NULL,SecurityDescriptor) ;
Status = FltCreateFile(FltObjects->Filter, //FltCreateFileEx
FltObjects->Instance,
phFile,
DesiredAccess,
&ob,
IoStatus,
&AllocationSize,
FileAttributes,
ShareAccess,
CreateDisposition,
Options,
EaBuffer,
EaLength,
Flags
);
if(NT_SUCCESS(Status))
{
Status = ObReferenceObjectByHandle(*phFile,
0,
*IoFileObjectType,
KernelMode,
pFileObject,
NULL);
if(!NT_SUCCESS(Status))
{
FltClose(*phFile);
*pFileObject = NULL;
}
}
if(!NT_SUCCESS(Status))
{
DbgPrint("create false filename %ws \n",FileName->Buffer);
}
return Status;
}
NTSTATUS CreateFileByNonExistFcb(__inout PFLT_CALLBACK_DATA Data,
__in PCFLT_RELATED_OBJECTS FltObjects,
__in PFCB Fcb,
__in PIRP_CONTEXT IrpContext,
__in PUCHAR HashValue
)
{
NTSTATUS Status = STATUS_SUCCESS;
ULONG Options;
ULONG CreateDisposition;
BOOLEAN bDirectory = FALSE;
BOOLEAN IsEnFile = FALSE;
BOOLEAN IsDisEncryptFile = FALSE;
BOOLEAN NeedOwnFcb = FALSE;
BOOLEAN OrgEnFile = FALSE;
BOOLEAN DeleteOnClose = FALSE;
BOOLEAN NoIntermediateBuffering = FALSE;
BOOLEAN OpenRequiringOplock;
PFLT_IO_PARAMETER_BLOCK Iopb = Data->Iopb;
PFILE_OBJECT FileObject = FltObjects->FileObject;
FLT_PREOP_CALLBACK_STATUS FltOplockStatus;
PFLT_CALLBACK_DATA OrgData = NULL;
ACCESS_MASK DesiredAccess ;
ULONG ShareAccess;
LARGE_INTEGER AllocationSize;
LARGE_INTEGER FileBeginOffset;
AllocationSize.QuadPart = Iopb->Parameters.Create.AllocationSize.QuadPart;
DesiredAccess = Iopb->Parameters.Create.SecurityContext->DesiredAccess ; //创建权限加上读取文件的权限
ShareAccess = Iopb->Parameters.Create.ShareAccess; //共享权限
Options = Iopb->Parameters.Create.Options; //options
CreateDisposition = (Options >> 24) & 0x000000ff;
OpenRequiringOplock = BooleanFlagOn( Options, FILE_OPEN_REQUIRING_OPLOCK );
DeleteOnClose = BooleanFlagOn(Options, FILE_DELETE_ON_CLOSE);
NoIntermediateBuffering = BooleanFlagOn( Options, FILE_NO_INTERMEDIATE_BUFFERING );
if(IrpContext->OriginatingData != NULL)
{
OrgData = IrpContext->OriginatingData;
}
else
{
OrgData = Data;
}
IrpContext->FltStatus = FLT_PREOP_COMPLETE;
try{
Status = CreateFileImitation(Data,
FltObjects,
&IrpContext->CreateInfo.nameInfo->Name,
&IrpContext->CreateInfo.StreamHandle,
&IrpContext->CreateInfo.StreamObject,
&Data->IoStatus,
IrpContext->CreateInfo.Network
); //模仿上层打开这个文件
if(!NT_SUCCESS(Status))
{
if(Status == STATUS_FILE_IS_A_DIRECTORY)
{
try_return(IrpContext->FltStatus = FLT_PREOP_SUCCESS_NO_CALLBACK);
}
else
{
Data->IoStatus.Status = Status;
try_return(IrpContext->FltStatus = FLT_PREOP_COMPLETE);
}
}
IrpContext->CreateInfo.Information = Data->IoStatus.Information;
Status = MyGetFileStandardInfo(Data,
FltObjects,
IrpContext->CreateInfo.StreamObject,
&IrpContext->CreateInfo.FileAllocationSize,
&IrpContext->CreateInfo.FileSize,
&bDirectory); //这里还不能用FltObject中的文件对象
if (!NT_SUCCESS(Status) || bDirectory)//失败了返回失败
{
try_return(IrpContext->FltStatus = (bDirectory ? FLT_PREOP_SUCCESS_NO_CALLBACK : FLT_PREOP_COMPLETE));
}
//这里可以通知应用层文件创建请求，应用层判断是否加密
Status = CreatedFileHeaderInfo(IrpContext);
if(!NT_SUCCESS(Status))
{
Data->IoStatus.Status = Status;
try_return(IrpContext->FltStatus = FLT_PREOP_COMPLETE);
}
if( IrpContext->CreateInfo.FileAccess == FILE_NO_ACCESS )
{
Status = STATUS_ACCESS_DENIED;
try_return(Status);
}
if( IrpContext->CreateInfo.FileAccess == FILE_ONLY_READ &&
(BooleanFlagOn(DesiredAccess,FILE_WRITE_DATA) ||
BooleanFlagOn(DesiredAccess,FILE_APPEND_DATA)))
{
Status = STATUS_ACCESS_DENIED;
try_return(Status);
}
IrpContext->CreateInfo.DeleteOnClose = DeleteOnClose;
Status = CreateFcbAndCcb(Data,FltObjects,IrpContext,HashValue);
if(NT_SUCCESS(Status))
{
PCCB Ccb;
Fcb = IrpContext->CreateInfo.Fcb;
Ccb = IrpContext->CreateInfo.Ccb;
if(IS_WINDOWS7() || IS_WINDOWS7_LATER())
{
FltOplockStatus = gDynamicFunctions.CheckOplockEx( &Fcb->Oplock,
OrgData,
OPLOCK_FLAG_OPLOCK_KEY_CHECK_ONLY,
NULL,
NULL,
NULL );
if(FltOplockStatus == FLT_PREOP_COMPLETE)
{
try_return( Status = OrgData->IoStatus.Status);
}
if (OpenRequiringOplock)
{
FltOplockStatus = FltOplockFsctrl( &Fcb->Oplock,
OrgData,
(Fcb->OpenHandleCount) );
if(OrgData->IoStatus.Status != STATUS_SUCCESS &&
OrgData->IoStatus.Status != STATUS_OPLOCK_BREAK_IN_PROGRESS)
{
X70FsdRaiseStatus( IrpContext, OrgData->IoStatus.Status);
}
}
}
FileObject->FsContext = Fcb;
FileObject->SectionObjectPointer = &Fcb->SectionObjectPointers;
FileObject->Vpb = IrpContext->CreateInfo.StreamObject->Vpb;
FileObject->FsContext2 = Ccb;
SetFlag(FileObject->Flags,FO_WRITE_THROUGH);
IoSetShareAccess(
DesiredAccess,
ShareAccess,
FileObject,
&Fcb->ShareAccess
);
InterlockedIncrement((PLONG)&Fcb->ReferenceCount);
InterlockedIncrement((PLONG)&Fcb->OpenHandleCount);
if ( FlagOn( FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING ) )
{
InterlockedIncrement((PLONG)&Fcb->NonCachedCleanupCount);
}
if(IrpContext->CreateInfo.DeleteOnClose)
{
SetFlag(Fcb->FcbState,SCB_STATE_DELETE_ON_CLOSE);
}
if( CreateDisposition == FILE_SUPERSEDE ||
CreateDisposition == FILE_OVERWRITE ||
CreateDisposition == FILE_OVERWRITE_IF )
{
Status = X70FsdOverWriteFile(FileObject,Fcb,AllocationSize);
}
if(!NoIntermediateBuffering)
{
FileObject->Flags |= FO_CACHE_SUPPORTED;
}
}
try_return(Status);
try_exit: NOTHING;
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
PFCB Fcb = FileObject->FsContext;
PCCB Ccb = FileObject->FsContext2;
Status = GetExceptionCode();
IrpContext->CreateInfo.ReissueIo = FALSE;
IrpContext->FltStatus = FLT_PREOP_COMPLETE;
if(Fcb != NULL)
{
X70FsdFreeFcb(Fcb,IrpContext);
FileObject->FsContext = NULL;
}
if(Ccb != NULL)
{
if(Ccb->StreamFileInfo.FO_Resource != NULL)
{
ExDeleteResourceLite(Ccb->StreamFileInfo.FO_Resource);
ExFreeToNPagedLookasideList(&G_EResourceLookasideList,Ccb->StreamFileInfo.FO_Resource);
Ccb->StreamFileInfo.FO_Resource = NULL;
}
ExFreeToNPagedLookasideList(&G_CcbLookasideList,Ccb);
FileObject->FsContext2 = NULL;
}
}
return Status;
}
NTSTATUS CreateFileByExistFcb(__inout PFLT_CALLBACK_DATA Data,
__in PCFLT_RELATED_OBJECTS FltObjects,
__in PFCB Fcb,
__in PIRP_CONTEXT IrpContext)
{
NTSTATUS Status = STATUS_SUCCESS;
BOOLEAN Flag;
PFILE_OBJECT FileObject = FltObjects->FileObject;
PFLT_IO_PARAMETER_BLOCK CONST Iopb = Data->Iopb;
LARGE_INTEGER AllocationSize ;
FLT_PREOP_CALLBACK_STATUS FltOplockStatus;
PCCB Ccb = NULL;
ACCESS_MASK DesiredAccess ;
ULONG EaLength;
PVOID EaBuffer;
ULONG Options;
ULONG CreateDisposition;
ULONG FileAttributes;
ULONG ShareAccess;
BOOLEAN NoEaKnowledge;
BOOLEAN DeleteOnClose;
BOOLEAN NoIntermediateBuffering;
BOOLEAN TemporaryFile;
BOOLEAN bDirectory = FALSE;
BOOLEAN OpenRequiringOplock = FALSE;
BOOLEAN DecrementFcbOpenCount = FALSE;
BOOLEAN RemoveShareAccess = FALSE;
BOOLEAN AcquiredPagingResource = FALSE;
PACCESS_MASK DesiredAccessPtr;
PIO_SECURITY_CONTEXT SecurityContext;
PFLT_CALLBACK_DATA OrgData = NULL;
ACCESS_MASK PreDesiredAccess;
BOOLEAN FcbAcquired = FALSE;
BOOLEAN FsRtlHeaderLocked = TRUE;
BOOLEAN EncryptResourceAcquired = FALSE;
UNREFERENCED_PARAMETER( FltObjects );
AllocationSize.QuadPart = Iopb->Parameters.Create.AllocationSize.QuadPart;
EaBuffer = Iopb->Parameters.Create.EaBuffer;
DesiredAccess = Iopb->Parameters.Create.SecurityContext->DesiredAccess ;
DesiredAccessPtr = &Iopb->Parameters.Create.SecurityContext->DesiredAccess;
SecurityContext = Iopb->Parameters.Create.SecurityContext;
Options = Iopb->Parameters.Create.Options;
FileAttributes = Iopb->Parameters.Create.FileAttributes;
ShareAccess = Iopb->Parameters.Create.ShareAccess;
EaLength = Iopb->Parameters.Create.EaLength;
CreateDisposition = (Options >> 24) & 0x000000ff;
SecurityContext = Iopb->Parameters.Create.SecurityContext;
PreDesiredAccess = DesiredAccess;
OpenRequiringOplock = BooleanFlagOn( Options, FILE_OPEN_REQUIRING_OPLOCK );
NoEaKnowledge = BooleanFlagOn(Options, FILE_NO_EA_KNOWLEDGE);
DeleteOnClose = BooleanFlagOn(Options, FILE_DELETE_ON_CLOSE);
NoIntermediateBuffering = BooleanFlagOn( Options, FILE_NO_INTERMEDIATE_BUFFERING );
TemporaryFile = BooleanFlagOn(FileAttributes, FILE_ATTRIBUTE_TEMPORARY);
IrpContext->FltStatus = FLT_PREOP_COMPLETE;
if(IrpContext->OriginatingData != NULL)
{
OrgData = IrpContext->OriginatingData;
}
else
{
OrgData = Data;
}
try
{
(VOID)X70FsdAcquireExclusiveFcb( IrpContext, Fcb );
FcbAcquired = TRUE;
ExAcquireResourceExclusiveLite(Fcb->EncryptResource,TRUE);
EncryptResourceAcquired = TRUE;
if (FlagOn( Fcb->FcbState, SCB_STATE_DELETE_ON_CLOSE ) && Fcb->OpenHandleCount != 0)
{
try_return( Status = STATUS_DELETE_PENDING );
}
IrpContext->CreateInfo.OplockPostIrp = FALSE;
if(IS_WINDOWS7() || IS_WINDOWS7_LATER())
{
FltOplockStatus = gDynamicFunctions.CheckOplockEx( &Fcb->Oplock,
OrgData,
OPLOCK_FLAG_OPLOCK_KEY_CHECK_ONLY,
NULL,
NULL,
NULL );
if(FltOplockStatus == FLT_PREOP_COMPLETE)
{
try_return( Status = OrgData->IoStatus.Status);
}
}
if (FltCurrentBatchOplock( &Fcb->Oplock ))
{
Data->IoStatus.Information = FILE_OPBATCH_BREAK_UNDERWAY;
FltOplockStatus = FltCheckOplock( &Fcb->Oplock,
OrgData,
IrpContext,
X70FsdOplockComplete,
X70FsdPrePostIrp );
if (FLT_PREOP_PENDING == FltOplockStatus)
{
Status = STATUS_PENDING;
IrpContext->FltStatus = FLT_PREOP_PENDING;
IrpContext->CreateInfo.OplockPostIrp = TRUE;
try_return( Status );
}
if(FltOplockStatus == FLT_PREOP_COMPLETE)
{
try_return( Status = OrgData->IoStatus.Status);
}
}
if (CreateDisposition == FILE_CREATE && Fcb->OpenHandleCount != 0)
{
Status = STATUS_OBJECT_NAME_COLLISION;
try_return( Status );
}
else if (CreateDisposition == FILE_OVERWRITE ||
CreateDisposition == FILE_OVERWRITE_IF )
{
SetFlag( DesiredAccess, FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA | FILE_WRITE_DATA );
}
else if ( CreateDisposition == FILE_SUPERSEDE )
{
SetFlag( DesiredAccess, DELETE );
}
if (!NT_SUCCESS(Status = IoCheckShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Fcb->ShareAccess,
FALSE )))
{
if(IS_WINDOWS7() || IS_WINDOWS7_LATER())
{
if ((Status == STATUS_SHARING_VIOLATION) &&
!FlagOn( OrgData->Iopb->Parameters.Create.Options, FILE_COMPLETE_IF_OPLOCKED ))
{
FltOplockStatus = gDynamicFunctions.OplockBreakH( &Fcb->Oplock,
OrgData,
0,
IrpContext,
X70FsdOplockComplete,
X70FsdPrePostIrp );
if (FltOplockStatus == FLT_PREOP_PENDING) {
Status = STATUS_PENDING;
IrpContext->FltStatus = FLT_PREOP_PENDING;
IrpContext->CreateInfo.OplockPostIrp = TRUE;
try_return( Status );
}
if(FltOplockStatus == FLT_PREOP_COMPLETE)
{
try_return( Status = OrgData->IoStatus.Status);
}
else
{
try_return( Status = STATUS_SHARING_VIOLATION );
}
}
}
try_return( Status );
}
if(IS_WINDOWS7() || IS_WINDOWS7_LATER())
{
if (Fcb->OpenHandleCount != 0)
{
FltOplockStatus = FltCheckOplock( &Fcb->Oplock,
OrgData,
IrpContext,
X70FsdOplockComplete,
X70FsdPrePostIrp );
}
if (FltOplockStatus == FLT_PREOP_PENDING)
{
Status = STATUS_PENDING;
IrpContext->FltStatus = FLT_PREOP_PENDING;
IrpContext->CreateInfo.OplockPostIrp = TRUE;
try_return( Status );
}
if(FltOplockStatus == FLT_PREOP_COMPLETE)
{
try_return( Status = OrgData->IoStatus.Status);
}
if (OpenRequiringOplock )
{
FltOplockStatus = FltOplockFsctrl( &Fcb->Oplock,
OrgData,
Fcb->OpenHandleCount );
if(OrgData->IoStatus.Status != STATUS_SUCCESS &&
OrgData->IoStatus.Status != STATUS_OPLOCK_BREAK_IN_PROGRESS)
{
try_return( Status = OrgData->IoStatus.Status );
}
}
}
else
{
FltOplockStatus = FltCheckOplock( &Fcb->Oplock,
OrgData,
IrpContext,
X70FsdOplockComplete,
X70FsdPrePostIrp );
if (FltOplockStatus == FLT_PREOP_PENDING)
{
Status = STATUS_PENDING;
IrpContext->FltStatus = FLT_PREOP_PENDING;
IrpContext->CreateInfo.OplockPostIrp = TRUE;
try_return( Status );
}
if(FltOplockStatus == FLT_PREOP_COMPLETE)
{
try_return( Status = OrgData->IoStatus.Status);
}
}
ExAcquireFastMutex(Fcb->Header.FastMutex);
if ( FltOplockIsFastIoPossible(&Fcb->Oplock) )
{
if ( Fcb->FileLock &&
Fcb->FileLock->FastIoIsQuestionable )
{
Fcb->Header.IsFastIoPossible = FastIoIsQuestionable;
}
else
{
Fcb->Header.IsFastIoPossible = FastIoIsPossible;
}
}
else
{
Fcb->Header.IsFastIoPossible = FastIoIsNotPossible;
}
ExReleaseFastMutex(Fcb->Header.FastMutex);
Flag = FALSE;
if (FlagOn(DesiredAccess, FILE_WRITE_DATA) || DeleteOnClose)
{
InterlockedIncrement((PLONG)&Fcb->ReferenceCount);
DecrementFcbOpenCount = TRUE;
if (!MmFlushImageSection( &Fcb->SectionObjectPointers,
MmFlushForWrite ))
{
Status = ( DeleteOnClose ? STATUS_CANNOT_DELETE : STATUS_SHARING_VIOLATION );
try_return( Status );
}
}
if ( FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING) &&
(Fcb->SectionObjectPointers.DataSectionObject != NULL))//先刷新缓存 //见fat create 2932
{
CcFlushCache(&Fcb->SectionObjectPointers, NULL, 0, NULL);
ExAcquireResourceExclusiveLite(Fcb->Header.PagingIoResource, TRUE);
ExReleaseResourceLite(Fcb->Header.PagingIoResource);
CcPurgeCacheSection(&Fcb->SectionObjectPointers, NULL, 0, FALSE);
}
if(DeleteOnClose)
{
SetFlag(Fcb->FcbState,SCB_STATE_DELETE_ON_CLOSE);
}
if ( CreateDisposition == FILE_SUPERSEDE ||
CreateDisposition == FILE_OVERWRITE ||
CreateDisposition == FILE_OVERWRITE_IF )
{
if(!MmCanFileBeTruncated(&Fcb->SectionObjectPointers, &Li0))
{
try_return( Status = STATUS_USER_MAPPED_FILE);
}
}
Status = CreateFileImitation(Data,
FltObjects,
&IrpContext->CreateInfo.nameInfo->Name,
&IrpContext->CreateInfo.StreamHandle,
&IrpContext->CreateInfo.StreamObject,
&Data->IoStatus,
IrpContext->CreateInfo.Network
);
if(!NT_SUCCESS(Status)) /
{
if(Status == STATUS_FILE_IS_A_DIRECTORY)
{
try_return(IrpContext->FltStatus = FLT_PREOP_SUCCESS_NO_CALLBACK);
}
else
{
Data->IoStatus.Status = Status;
try_return(IrpContext->FltStatus = FLT_PREOP_COMPLETE);
}
}
IrpContext->CreateInfo.Information = Data->IoStatus.Information;
Status = MyGetFileStandardInfo(Data,
FltObjects,
IrpContext->CreateInfo.StreamObject,
&IrpContext->CreateInfo.FileAllocationSize,
&IrpContext->CreateInfo.FileSize,
&bDirectory);
if (!NT_SUCCESS(Status) || bDirectory)
{
try_return(IrpContext->FltStatus = (bDirectory ? FLT_PREOP_SUCCESS_NO_CALLBACK : FLT_PREOP_COMPLETE));
}
Status = CreatedFileHeaderInfo(IrpContext);
if(!NT_SUCCESS(Status))
{
Data->IoStatus.Status = Status;
try_return(IrpContext->FltStatus = FLT_PREOP_COMPLETE);
}
if( IrpContext->CreateInfo.FileAccess == FILE_NO_ACCESS )
{
Status = STATUS_ACCESS_DENIED;
try_return(Status);
}
if( IrpContext->CreateInfo.FileAccess == FILE_ONLY_READ &&
(BooleanFlagOn(DesiredAccess,FILE_WRITE_DATA) ||
BooleanFlagOn(DesiredAccess,FILE_APPEND_DATA)) )
{
Status = STATUS_ACCESS_DENIED;
try_return(Status);
}
//写过了加密头
if(!Fcb->IsEnFile && IrpContext->CreateInfo.IsEnFile)
{
Fcb->IsEnFile = IrpContext->CreateInfo.IsEnFile;
Fcb->FileHeaderLength = FILE_HEADER_LENGTH;
SetFlag(Fcb->FcbState,SCB_STATE_FILEHEADER_WRITED);
}
Ccb = X70FsdCreateCcb();
Ccb->StreamFileInfo.StreamHandle = IrpContext->CreateInfo.StreamHandle;
Ccb->StreamFileInfo.StreamObject = IrpContext->CreateInfo.StreamObject;
Ccb->StreamFileInfo.FO_Resource = X70FsdAllocateResource();
Ccb->ProcType = IrpContext->CreateInfo.ProcType;
Ccb->FileAccess = IrpContext->CreateInfo.FileAccess;
RtlCopyMemory(Ccb->ProcessGuid,IrpContext->CreateInfo.ProcessGuid,GUID_SIZE);
if(IrpContext->CreateInfo.Network)
{
SetFlag(Ccb->CcbState,CCB_FLAG_NETWORK_FILE);
}
ExInitializeFastMutex( &Ccb->StreamFileInfo.FileObjectMutex );
FileObject->FsContext = Fcb;
FileObject->SectionObjectPointer = &Fcb->SectionObjectPointers;
FileObject->Vpb = IrpContext->CreateInfo.StreamObject->Vpb;
FileObject->FsContext2 = Ccb;
SetFlag(FileObject->Flags,FO_WRITE_THROUGH);
if ( CreateDisposition == FILE_SUPERSEDE ||
CreateDisposition == FILE_OVERWRITE ||
CreateDisposition == FILE_OVERWRITE_IF)
{
Status = X70FsdOverWriteFile(FileObject,Fcb,AllocationSize);
}
if(!NoIntermediateBuffering)
{
FileObject->Flags |= FO_CACHE_SUPPORTED;
}
try_exit: NOTHING;
if(IrpContext->FltStatus == FLT_PREOP_COMPLETE)
{
if ( NT_SUCCESS(Status) &&
Status != STATUS_PENDING )
{
if(FlagOn(Ccb->CcbState,CCB_FLAG_NETWORK_FILE))
{
NetFileSetCacheProperty(FileObject,DesiredAccess);
}
if ( DesiredAccess != PreDesiredAccess )
{
DesiredAccess = PreDesiredAccess;
Status = IoCheckShareAccess(
DesiredAccess,
ShareAccess,
FileObject,
&Fcb->ShareAccess,
TRUE
);
ASSERT( Status == STATUS_SUCCESS );
}
else
{
IoUpdateShareAccess(
FileObject,
&Fcb->ShareAccess
);
}
RemoveShareAccess = TRUE;
if(DeleteOnClose)
{
SetFlag(Fcb->FcbState,SCB_STATE_DELETE_ON_CLOSE);
}
InterlockedIncrement((PLONG)&Fcb->ReferenceCount);
InterlockedIncrement((PLONG)&Fcb->OpenHandleCount);
if ( FlagOn( FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING ) )
{
InterlockedIncrement((PLONG)&Fcb->NonCachedCleanupCount);
}
}
}
}
finally
{
if ( DecrementFcbOpenCount )
{
InterlockedDecrement((PLONG)&Fcb->ReferenceCount);
}
if (AbnormalTermination() )
{
if(RemoveShareAccess )
{
IoRemoveShareAccess(
FileObject,
&Fcb->ShareAccess
);
}
Status = STATUS_UNSUCCESSFUL;
Ccb = FileObject->FsContext2;
if(Ccb != NULL)
{
if(Ccb->StreamFileInfo.FO_Resource != NULL)
{
ExDeleteResourceLite(Ccb->StreamFileInfo.FO_Resource);
ExFreeToNPagedLookasideList(&G_EResourceLookasideList,Ccb->StreamFileInfo.FO_Resource);
Ccb->StreamFileInfo.FO_Resource = NULL;
}
ExFreeToNPagedLookasideList(&G_CcbLookasideList,Ccb);
FileObject->FsContext2 = NULL;
}
}
if(FcbAcquired)
{
X70FsdReleaseFcb( IrpContext, Fcb );
}
if(EncryptResourceAcquired)
{
ExReleaseResourceLite(Fcb->EncryptResource);
}
}
return Status;
}
BOOLEAN IsNeedSelfFcb(__inout PFLT_CALLBACK_DATA Data,PFLT_FILE_NAME_INFORMATION * nameInfo ,PNTSTATUS pStatus)
{
NTSTATUS Status;
BOOLEAN IsDirectory = FALSE;
if(!IsConcernedCreateOptions(Data))
{
*pStatus = STATUS_SUCCESS;
return FALSE;
}
Status = FltIsDirectory(Data->Iopb->TargetFileObject,Data->Iopb->TargetInstance,&IsDirectory);
if(NT_SUCCESS(Status) && IsDirectory)
{
*pStatus = STATUS_SUCCESS;
return FALSE;
}
Status = FltGetFileNameInformation( Data,
FLT_FILE_NAME_NORMALIZED |
FLT_FILE_NAME_QUERY_DEFAULT,
nameInfo );
if (!NT_SUCCESS( Status ))
{
Status = FltGetFileNameInformation( Data,
FLT_FILE_NAME_OPENED |
FLT_FILE_NAME_QUERY_DEFAULT,
nameInfo );
if(!NT_SUCCESS( Status ))
{
*pStatus = Status;
return FALSE;
}
}
Status = FltParseFileNameInformation(*nameInfo);
if(!NT_SUCCESS( Status ))
{
*pStatus = Status;
return FALSE;
}
//根据得到的文件信息剔除掉打开盘符的操作
if (0 == (*nameInfo)->Name.Length)
{
*pStatus = STATUS_SUCCESS;
return FALSE;
}
if((*nameInfo)->FinalComponent.Length == 0) //打开的是卷或者目录
{
*pStatus = STATUS_SUCCESS;
return FALSE;
}
if((*nameInfo)->Extension.Length == 0 && (*nameInfo)->Share.Length != 0)
{
if((*nameInfo)->Share.Length >= NAMED_PIPE_PREFIX_LENGTH)
{
UNICODE_STRING ShareName;