mirror of
https://github.com/winfsp/winfsp.git
synced 2025-04-23 00:43:00 -05:00
Major refactoring: IRP_MJ_CREATE
This commit is contained in:
Bill Zissimopoulos
parent
fbed887601
commit
983ba0bcc1
233
src/sys/create.c
233
src/sys/create.c
@ -30,6 +30,12 @@ FSP_DRIVER_DISPATCH FspCreate;
|
||||
#define PREFIXW L"" FSP_FSCTL_VOLUME_PARAMS_PREFIX
|
||||
#define PREFIXW_SIZE (sizeof PREFIXW - sizeof(WCHAR))
|
||||
|
||||
enum
|
||||
{
|
||||
RequestFsContext = 0,
|
||||
RequestAccessToken,
|
||||
};
|
||||
|
||||
static NTSTATUS FspFsctlCreate(
|
||||
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
|
||||
{
|
||||
@ -61,14 +67,224 @@ static NTSTATUS FspFsvrtCreate(
|
||||
}
|
||||
|
||||
static NTSTATUS FspFsvolCreate(
|
||||
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
|
||||
PDEVICE_OBJECT FsvolDeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
|
||||
{
|
||||
PAGED_CODE();
|
||||
|
||||
NTSTATUS Result;
|
||||
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(FsvolDeviceObject);
|
||||
PFILE_OBJECT FileObject = IrpSp->FileObject;
|
||||
PFILE_OBJECT RelatedFileObject = FileObject->RelatedFileObject;
|
||||
UNICODE_STRING FileName = FileObject->FileName;
|
||||
|
||||
/* open the volume object? */
|
||||
if ((0 == RelatedFileObject || RelatedFileObject->FsContext) && 0 == FileName.Length)
|
||||
{
|
||||
if (0 != FsvolDeviceExtension->FsvrtDeviceObject)
|
||||
IrpSp->FileObject->Vpb = FsvolDeviceExtension->FsvrtDeviceObject->Vpb;
|
||||
|
||||
Irp->IoStatus.Information = FILE_OPENED;
|
||||
return STATUS_SUCCESS;
|
||||
}
|
||||
|
||||
PACCESS_STATE AccessState = IrpSp->Parameters.Create.SecurityContext->AccessState;
|
||||
ULONG CreateOptions = IrpSp->Parameters.Create.Options;
|
||||
USHORT FileAttributes = IrpSp->Parameters.Create.FileAttributes;
|
||||
PSECURITY_DESCRIPTOR SecurityDescriptor = AccessState->SecurityDescriptor;
|
||||
ULONG SecurityDescriptorSize = 0;
|
||||
LARGE_INTEGER AllocationSize = Irp->Overlay.AllocationSize;
|
||||
ACCESS_MASK DesiredAccess = IrpSp->Parameters.Create.SecurityContext->DesiredAccess;
|
||||
USHORT ShareAccess = IrpSp->Parameters.Create.ShareAccess;
|
||||
PFILE_FULL_EA_INFORMATION EaBuffer = Irp->AssociatedIrp.SystemBuffer;
|
||||
//ULONG EaLength = IrpSp->Parameters.Create.EaLength;
|
||||
ULONG Flags = IrpSp->Flags;
|
||||
KPROCESSOR_MODE RequestorMode =
|
||||
FlagOn(Flags, SL_FORCE_ACCESS_CHECK) ? UserMode : Irp->RequestorMode;
|
||||
BOOLEAN HasTraversePrivilege =
|
||||
BooleanFlagOn(AccessState->Flags, TOKEN_HAS_TRAVERSE_PRIVILEGE);
|
||||
BOOLEAN IsAbsoluteSecurityDescriptor = FALSE;
|
||||
BOOLEAN IsSelfRelativeSecurityDescriptor = FALSE;
|
||||
BOOLEAN HasTrailingBackslash = FALSE;
|
||||
FSP_FILE_CONTEXT *FsContext = 0, *RelatedFsContext;
|
||||
FSP_FSCTL_TRANSACT_REQ *Request;
|
||||
|
||||
/* cannot open files by fileid */
|
||||
if (FlagOn(CreateOptions, FILE_OPEN_BY_FILE_ID))
|
||||
return STATUS_NOT_IMPLEMENTED;
|
||||
|
||||
/* do we not support EA */
|
||||
if (0 != EaBuffer)
|
||||
return STATUS_EAS_NOT_SUPPORTED;
|
||||
|
||||
/* cannot open a paging file */
|
||||
if (FlagOn(Flags, SL_OPEN_PAGING_FILE))
|
||||
return STATUS_ACCESS_DENIED;
|
||||
|
||||
/* check create options */
|
||||
if (FlagOn(CreateOptions, FILE_NON_DIRECTORY_FILE) && FlagOn(CreateOptions, FILE_DIRECTORY_FILE))
|
||||
return STATUS_INVALID_PARAMETER;
|
||||
|
||||
/* check security descriptor validity */
|
||||
if (0 != SecurityDescriptor)
|
||||
{
|
||||
IsAbsoluteSecurityDescriptor = RtlValidSecurityDescriptor(SecurityDescriptor);
|
||||
if (IsAbsoluteSecurityDescriptor)
|
||||
{
|
||||
Result = RtlAbsoluteToSelfRelativeSD(SecurityDescriptor, 0, &SecurityDescriptorSize);
|
||||
if (STATUS_BUFFER_TOO_SMALL != Result)
|
||||
return STATUS_INVALID_PARAMETER;
|
||||
}
|
||||
else
|
||||
{
|
||||
SecurityDescriptorSize = RtlLengthSecurityDescriptor(SecurityDescriptor);
|
||||
IsSelfRelativeSecurityDescriptor = RtlValidRelativeSecurityDescriptor(
|
||||
SecurityDescriptor, SecurityDescriptorSize, 0);
|
||||
if (!IsSelfRelativeSecurityDescriptor)
|
||||
return STATUS_INVALID_PARAMETER;
|
||||
}
|
||||
}
|
||||
|
||||
/* according to fastfat, filenames that begin with two backslashes are ok */
|
||||
if (sizeof(WCHAR) * 2 <= FileName.Length &&
|
||||
L'\\' == FileName.Buffer[1] && L'\\' == FileName.Buffer[0])
|
||||
{
|
||||
FileName.Length -= sizeof(WCHAR);
|
||||
FileName.MaximumLength -= sizeof(WCHAR);
|
||||
FileName.Buffer++;
|
||||
|
||||
if (sizeof(WCHAR) * 2 <= FileName.Length &&
|
||||
L'\\' == FileName.Buffer[1] && L'\\' == FileName.Buffer[0])
|
||||
return STATUS_OBJECT_NAME_INVALID;
|
||||
}
|
||||
|
||||
/* check for trailing backslash */
|
||||
if (sizeof(WCHAR) * 2/* not empty or root */ <= FileName.Length &&
|
||||
L'\\' == FileName.Buffer[FileName.Length / 2 - 1])
|
||||
{
|
||||
FileName.Length -= sizeof(WCHAR);
|
||||
HasTrailingBackslash = TRUE;
|
||||
|
||||
if (sizeof(WCHAR) * 2 <= FileName.Length && L'\\' == FileName.Buffer[FileName.Length / 2 - 1])
|
||||
return STATUS_OBJECT_NAME_INVALID;
|
||||
}
|
||||
if (HasTrailingBackslash && !FlagOn(CreateOptions, FILE_DIRECTORY_FILE))
|
||||
return STATUS_OBJECT_NAME_INVALID;
|
||||
|
||||
/* is this a relative or absolute open? */
|
||||
if (0 != RelatedFileObject)
|
||||
{
|
||||
RelatedFsContext = RelatedFileObject->FsContext;
|
||||
|
||||
/* is this a valid RelatedFileObject? */
|
||||
if (!FspFileContextIsValid(RelatedFsContext))
|
||||
return STATUS_OBJECT_PATH_NOT_FOUND;
|
||||
|
||||
/* must be a relative path */
|
||||
if (sizeof(WCHAR) <= FileName.Length && L'\\' == FileName.Buffer[0])
|
||||
return STATUS_OBJECT_NAME_INVALID;
|
||||
|
||||
/* cannot FILE_DELETE_ON_CLOSE on the root directory */
|
||||
if (FlagOn(CreateOptions, FILE_DELETE_ON_CLOSE) &&
|
||||
sizeof(WCHAR) == RelatedFsContext->FileName.Length && 0 == FileName.Length)
|
||||
return STATUS_CANNOT_DELETE;
|
||||
|
||||
/*
|
||||
* There is no need to lock our accesses of RelatedFileObject->FsContext->FileName,
|
||||
* because RelatedFileObject->FsContext->Filename is read-only (after creation) and
|
||||
* because RelatedFileObject->FsContext is guaranteed to exist while RelatedFileObject
|
||||
* exists.
|
||||
*/
|
||||
BOOLEAN AppendBackslash =
|
||||
sizeof(WCHAR) * 2/* not empty or root */ <= RelatedFsContext->FileName.Length &&
|
||||
sizeof(WCHAR) <= FileName.Length && L':' != FileName.Buffer[0];
|
||||
Result = FspFileContextCreate(FsvolDeviceObject,
|
||||
RelatedFsContext->FileName.Length + AppendBackslash * sizeof(WCHAR) + FileName.Length,
|
||||
&FsContext);
|
||||
if (!NT_SUCCESS(Result))
|
||||
return Result;
|
||||
|
||||
Result = RtlAppendUnicodeStringToString(&FsContext->FileName, &RelatedFsContext->FileName);
|
||||
ASSERT(NT_SUCCESS(Result));
|
||||
if (AppendBackslash)
|
||||
{
|
||||
Result = RtlAppendUnicodeToString(&FsContext->FileName, L"\\");
|
||||
ASSERT(NT_SUCCESS(Result));
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* must be an absolute path */
|
||||
if (sizeof(WCHAR) <= FileName.Length && L'\\' != FileName.Buffer[0])
|
||||
return STATUS_OBJECT_NAME_INVALID;
|
||||
|
||||
/* cannot FILE_DELETE_ON_CLOSE on the root directory */
|
||||
if (FlagOn(CreateOptions, FILE_DELETE_ON_CLOSE) &&
|
||||
sizeof(WCHAR) == FileName.Length)
|
||||
return STATUS_CANNOT_DELETE;
|
||||
|
||||
Result = FspFileContextCreate(FsvolDeviceObject,
|
||||
FileName.Length,
|
||||
&FsContext);
|
||||
if (!NT_SUCCESS(Result))
|
||||
return Result;
|
||||
}
|
||||
|
||||
Result = RtlAppendUnicodeStringToString(&FsContext->FileName, &FileName);
|
||||
ASSERT(NT_SUCCESS(Result));
|
||||
|
||||
/* create the user-mode file system request */
|
||||
Result = FspIopCreateRequestEx(Irp, &FsContext->FileName, SecurityDescriptorSize,
|
||||
FspFsvolCreateRequestFini, &Request);
|
||||
if (!NT_SUCCESS(Result))
|
||||
{
|
||||
FspFileContextDelete(FsContext);
|
||||
return Result;
|
||||
}
|
||||
|
||||
/*
|
||||
* The new request is associated with our IRP. Go ahead and associate our FsContext
|
||||
* with the Request as well. After this is done completing our IRP will automatically
|
||||
* delete the Request and any associated resources.
|
||||
*/
|
||||
FspIopRequestContext(Request, RequestFsContext) = FsContext;
|
||||
|
||||
/* populate the Create request */
|
||||
Request->Kind = FspFsctlTransactCreateKind;
|
||||
Request->Req.Create.CreateOptions = CreateOptions;
|
||||
Request->Req.Create.FileAttributes = FileAttributes;
|
||||
Request->Req.Create.SecurityDescriptor.Offset = 0 == SecurityDescriptorSize ? 0 :
|
||||
FSP_FSCTL_DEFAULT_ALIGN_UP(Request->FileName.Size);
|
||||
Request->Req.Create.SecurityDescriptor.Size = (UINT16)SecurityDescriptorSize;
|
||||
Request->Req.Create.AllocationSize = AllocationSize.QuadPart;
|
||||
Request->Req.Create.AccessToken = 0;
|
||||
Request->Req.Create.DesiredAccess = DesiredAccess;
|
||||
Request->Req.Create.ShareAccess = ShareAccess;
|
||||
Request->Req.Create.Ea.Offset = 0;
|
||||
Request->Req.Create.Ea.Size = 0;
|
||||
Request->Req.Create.UserMode = UserMode == RequestorMode;
|
||||
Request->Req.Create.HasTraversePrivilege = HasTraversePrivilege;
|
||||
Request->Req.Create.OpenTargetDirectory = BooleanFlagOn(Flags, SL_OPEN_TARGET_DIRECTORY);
|
||||
Request->Req.Create.CaseSensitive = BooleanFlagOn(Flags, SL_CASE_SENSITIVE);
|
||||
|
||||
/* copy the security descriptor into the request */
|
||||
if (IsAbsoluteSecurityDescriptor)
|
||||
{
|
||||
Result = RtlAbsoluteToSelfRelativeSD(SecurityDescriptor,
|
||||
Request->Buffer + Request->Req.Create.SecurityDescriptor.Offset, &SecurityDescriptorSize);
|
||||
if (!NT_SUCCESS(Result))
|
||||
{
|
||||
if (STATUS_BAD_DESCRIPTOR_FORMAT == Result || STATUS_BUFFER_TOO_SMALL == Result)
|
||||
Result = STATUS_INVALID_PARAMETER; /* should not happen */
|
||||
return Result;
|
||||
}
|
||||
}
|
||||
else if (IsSelfRelativeSecurityDescriptor)
|
||||
RtlCopyMemory(Request->Buffer + Request->Req.Create.SecurityDescriptor.Offset,
|
||||
SecurityDescriptor, SecurityDescriptorSize);
|
||||
|
||||
return STATUS_PENDING;
|
||||
}
|
||||
|
||||
NTSTATUS FspFsvolCreatePrepare(
|
||||
PIRP Irp, FSP_FSCTL_TRANSACT_REQ *Request)
|
||||
{
|
||||
@ -90,6 +306,21 @@ VOID FspFsvolCreateComplete(
|
||||
static VOID FspFsvolCreateRequestFini(PVOID Context[3])
|
||||
{
|
||||
PAGED_CODE();
|
||||
|
||||
if (0 != Context[RequestFsContext])
|
||||
FspFileContextRelease(Context[RequestFsContext]);
|
||||
|
||||
if (0 != Context[RequestAccessToken])
|
||||
{
|
||||
#if DBG
|
||||
NTSTATUS Result0;
|
||||
Result0 = ObCloseHandle(Context[RequestAccessToken], KernelMode);
|
||||
if (!NT_SUCCESS(Result0))
|
||||
DEBUGLOG("ObCloseHandle() = %s", NtStatusSym(Result0));
|
||||
#else
|
||||
ObCloseHandle(Context[RequestAccessToken], KernelMode);
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
NTSTATUS FspCreate(
|
||||
|
||||
@ -448,6 +448,57 @@ NTSTATUS FspVolumeTransact(
|
||||
NTSTATUS FspVolumeWork(
|
||||
PDEVICE_OBJECT FsvolDeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp);
|
||||
|
||||
/* file objects */
|
||||
#define FspFileContextKind(FsContext) \
|
||||
(((FSP_FILE_CONTEXT *)FsContext)->Header.NodeTypeCode)
|
||||
#define FspFileContextIsValid(FsContext)\
|
||||
(0 != (FsContext) && FspFileContextFileKind == ((FSP_FILE_CONTEXT *)FsContext)->Header.NodeTypeCode)
|
||||
enum
|
||||
{
|
||||
FspFileContextFileKind = 'BZ',
|
||||
};
|
||||
typedef struct
|
||||
{
|
||||
ERESOURCE Resource;
|
||||
ERESOURCE PagingIoResource;
|
||||
FAST_MUTEX HeaderFastMutex;
|
||||
} FSP_FILE_CONTEXT_NONPAGED;
|
||||
typedef struct
|
||||
{
|
||||
FSRTL_ADVANCED_FCB_HEADER Header;
|
||||
FSP_FILE_CONTEXT_NONPAGED *NonPaged;
|
||||
/* interlocked access */
|
||||
LONG RefCount;
|
||||
#if 0
|
||||
/* protected by Header.Resource */
|
||||
LONG OpenCount;
|
||||
SHARE_ACCESS ShareAccess;
|
||||
BOOLEAN DeletePending; /* FileDispositionInformation */
|
||||
BOOLEAN DeleteOnClose; /* FILE_DELETE_ON_CLOSE */
|
||||
FSP_DEVICE_GENERIC_TABLE_ELEMENT ElementStorage;
|
||||
PDEVICE_OBJECT FsvolDeviceObject;
|
||||
UINT64 UserContext;
|
||||
#endif
|
||||
/* read-only after creation */
|
||||
UNICODE_STRING FileName;
|
||||
WCHAR FileNameBuf[];
|
||||
} FSP_FILE_CONTEXT;
|
||||
NTSTATUS FspFileContextCreate(PDEVICE_OBJECT DeviceObject,
|
||||
ULONG ExtraSize, FSP_FILE_CONTEXT **PFsContext);
|
||||
VOID FspFileContextDelete(FSP_FILE_CONTEXT *Context);
|
||||
static inline
|
||||
VOID FspFileContextRetain(FSP_FILE_CONTEXT *Context)
|
||||
{
|
||||
InterlockedIncrement(&Context->RefCount);
|
||||
}
|
||||
static inline
|
||||
VOID FspFileContextRelease(FSP_FILE_CONTEXT *Context)
|
||||
{
|
||||
LONG RefCount = InterlockedDecrement(&Context->RefCount);
|
||||
if (0 == RefCount)
|
||||
FspFileContextDelete(Context);
|
||||
}
|
||||
|
||||
/* debug */
|
||||
#if DBG
|
||||
const char *NtStatusSym(NTSTATUS Status);
|
||||
@ -464,21 +515,6 @@ extern FSP_IOPREP_DISPATCH *FspIopPrepareFunction[];
|
||||
extern FSP_IOCMPL_DISPATCH *FspIopCompleteFunction[];
|
||||
|
||||
#if 0
|
||||
/* file objects */
|
||||
#define FspFileContextKind(FsContext) \
|
||||
(((FSP_FILE_CONTEXT *)FsContext)->Header.NodeTypeCode)
|
||||
#define FspFileContextIsValid(FsContext)\
|
||||
(0 != (FsContext) && FspFileContextFileKind == ((FSP_FILE_CONTEXT *)FsContext)->Header.NodeTypeCode)
|
||||
enum
|
||||
{
|
||||
FspFileContextFileKind = 'BZ',
|
||||
};
|
||||
typedef struct
|
||||
{
|
||||
ERESOURCE Resource;
|
||||
ERESOURCE PagingIoResource;
|
||||
FAST_MUTEX HeaderFastMutex;
|
||||
} FSP_FILE_CONTEXT_NONPAGED;
|
||||
typedef struct
|
||||
{
|
||||
FSRTL_ADVANCED_FCB_HEADER Header;
|
||||
@ -513,18 +549,6 @@ LONG FspFileContextClose(FSP_FILE_CONTEXT *Context)
|
||||
ASSERT(0 < Context->OpenCount);
|
||||
return --Context->OpenCount;
|
||||
}
|
||||
static inline
|
||||
VOID FspFileContextRetain(FSP_FILE_CONTEXT *Context)
|
||||
{
|
||||
InterlockedIncrement(&Context->RefCount);
|
||||
}
|
||||
static inline
|
||||
VOID FspFileContextRelease(FSP_FILE_CONTEXT *Context)
|
||||
{
|
||||
LONG RefCount = InterlockedDecrement(&Context->RefCount);
|
||||
if (0 == RefCount)
|
||||
FspFileContextDelete(Context);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user