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sys: IRP_MJ_CREATE
This commit is contained in:
Bill Zissimopoulos
419
src/sys/create.c
419
src/sys/create.c
@@ -50,215 +50,260 @@ static NTSTATUS FspFsvolCreate(
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NTSTATUS Result;
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FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
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FSP_FSVRT_DEVICE_EXTENSION *FsvrtDeviceExtension =
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FspFsvrtDeviceExtension(FsvolDeviceExtension->FsvrtDeviceObject);
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PDEVICE_OBJECT FsvrtDeviceObject = FsvolDeviceExtension->FsvrtDeviceObject;
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PFILE_OBJECT FileObject = IrpSp->FileObject;
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PFILE_OBJECT RelatedFileObject = FileObject->RelatedFileObject;
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UNICODE_STRING FileName = FileObject->FileName;
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PACCESS_STATE AccessState = IrpSp->Parameters.Create.SecurityContext->AccessState;
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ULONG CreateDisposition = (IrpSp->Parameters.Create.Options >> 24) & 0xff;
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ULONG CreateOptions = IrpSp->Parameters.Create.Options & 0xffffff;
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USHORT FileAttributes = IrpSp->Parameters.Create.FileAttributes;
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PSECURITY_DESCRIPTOR SecurityDescriptor = AccessState->SecurityDescriptor;
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ULONG SecurityDescriptorSize = 0;
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LARGE_INTEGER AllocationSize = Irp->Overlay.AllocationSize;
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HANDLE AccessToken;
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ACCESS_MASK DesiredAccess = IrpSp->Parameters.Create.SecurityContext->DesiredAccess;
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USHORT ShareAccess = IrpSp->Parameters.Create.ShareAccess;
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PFILE_FULL_EA_INFORMATION EaBuffer = Irp->AssociatedIrp.SystemBuffer;
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//ULONG EaLength = IrpSp->Parameters.Create.EaLength;
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ULONG Flags = IrpSp->Flags;
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KPROCESSOR_MODE RequestorMode = FlagOn(Flags, SL_FORCE_ACCESS_CHECK) ? UserMode : Irp->RequestorMode;
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BOOLEAN HasTraversePrivilege = BooleanFlagOn(AccessState->Flags, TOKEN_HAS_TRAVERSE_PRIVILEGE);
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BOOLEAN IsAbsoluteSecurityDescriptor = FALSE;
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BOOLEAN IsSelfRelativeSecurityDescriptor = FALSE;
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BOOLEAN HasTrailingBackslash = FALSE;
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FSP_FILE_CONTEXT *FsContext = 0;
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FSP_FSCTL_TRANSACT_REQ *Request;
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/* cannot open the volume object */
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if (0 == RelatedFileObject && 0 == FileName.Length)
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return STATUS_ACCESS_DENIED; /* need error code like POSIX EPERM (STATUS_NOT_SUPPORTED?) */
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/* cannot open a paging file */
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if (FlagOn(Flags, SL_OPEN_PAGING_FILE))
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return STATUS_ACCESS_DENIED;
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/* cannot open files by fileid */
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if (FlagOn(CreateOptions, FILE_OPEN_BY_FILE_ID))
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return STATUS_NOT_IMPLEMENTED;
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/* do we support EA? */
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if (0 != EaBuffer && !FsvrtDeviceExtension->VolumeParams.EaSupported)
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return STATUS_EAS_NOT_SUPPORTED;
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/* check security descriptor validity */
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if (0 != SecurityDescriptor)
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if (!FspDeviceRetain(FsvrtDeviceObject))
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return STATUS_CANCELLED;
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try
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{
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IsAbsoluteSecurityDescriptor = RtlValidSecurityDescriptor(SecurityDescriptor);
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if (IsAbsoluteSecurityDescriptor)
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FSP_FSVRT_DEVICE_EXTENSION *FsvrtDeviceExtension =
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FspFsvrtDeviceExtension(FsvrtDeviceObject);
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PFILE_OBJECT FileObject = IrpSp->FileObject;
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PFILE_OBJECT RelatedFileObject = FileObject->RelatedFileObject;
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UNICODE_STRING FileName = FileObject->FileName;
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PACCESS_STATE AccessState = IrpSp->Parameters.Create.SecurityContext->AccessState;
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ULONG CreateDisposition = (IrpSp->Parameters.Create.Options >> 24) & 0xff;
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ULONG CreateOptions = IrpSp->Parameters.Create.Options & 0xffffff;
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USHORT FileAttributes = IrpSp->Parameters.Create.FileAttributes;
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PSECURITY_DESCRIPTOR SecurityDescriptor = AccessState->SecurityDescriptor;
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ULONG SecurityDescriptorSize = 0;
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LARGE_INTEGER AllocationSize = Irp->Overlay.AllocationSize;
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HANDLE AccessToken;
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ACCESS_MASK DesiredAccess = IrpSp->Parameters.Create.SecurityContext->DesiredAccess;
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USHORT ShareAccess = IrpSp->Parameters.Create.ShareAccess;
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PFILE_FULL_EA_INFORMATION EaBuffer = Irp->AssociatedIrp.SystemBuffer;
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//ULONG EaLength = IrpSp->Parameters.Create.EaLength;
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ULONG Flags = IrpSp->Flags;
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KPROCESSOR_MODE RequestorMode =
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FlagOn(Flags, SL_FORCE_ACCESS_CHECK) ? UserMode : Irp->RequestorMode;
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BOOLEAN HasTraversePrivilege =
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BooleanFlagOn(AccessState->Flags, TOKEN_HAS_TRAVERSE_PRIVILEGE);
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BOOLEAN IsAbsoluteSecurityDescriptor = FALSE;
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BOOLEAN IsSelfRelativeSecurityDescriptor = FALSE;
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BOOLEAN HasTrailingBackslash = FALSE;
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FSP_FILE_CONTEXT *FsContext = 0;
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FSP_FSCTL_TRANSACT_REQ *Request;
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/* cannot open the volume object */
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if (0 == RelatedFileObject && 0 == FileName.Length)
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{
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Result = RtlAbsoluteToSelfRelativeSD(SecurityDescriptor, 0, &SecurityDescriptorSize);
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if (STATUS_BUFFER_TOO_SMALL != Result)
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return STATUS_INVALID_PARAMETER;
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Result = STATUS_ACCESS_DENIED; /* need error code like POSIX EPERM (STATUS_NOT_SUPPORTED?) */
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goto exit;
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}
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/* cannot open a paging file */
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if (FlagOn(Flags, SL_OPEN_PAGING_FILE))
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{
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Result = STATUS_ACCESS_DENIED;
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goto exit;
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}
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/* cannot open files by fileid */
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if (FlagOn(CreateOptions, FILE_OPEN_BY_FILE_ID))
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{
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Result = STATUS_NOT_IMPLEMENTED;
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goto exit;
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}
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/* do we support EA? */
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if (0 != EaBuffer && !FsvrtDeviceExtension->VolumeParams.EaSupported)
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{
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Result = STATUS_EAS_NOT_SUPPORTED;
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goto exit;
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}
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/* check security descriptor validity */
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if (0 != SecurityDescriptor)
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{
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IsAbsoluteSecurityDescriptor = RtlValidSecurityDescriptor(SecurityDescriptor);
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if (IsAbsoluteSecurityDescriptor)
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{
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Result = RtlAbsoluteToSelfRelativeSD(SecurityDescriptor, 0, &SecurityDescriptorSize);
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if (STATUS_BUFFER_TOO_SMALL != Result)
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{
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Result = STATUS_INVALID_PARAMETER;
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goto exit;
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}
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}
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else
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{
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SecurityDescriptorSize = RtlLengthSecurityDescriptor(SecurityDescriptor);
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IsSelfRelativeSecurityDescriptor = RtlValidRelativeSecurityDescriptor(
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SecurityDescriptor, SecurityDescriptorSize, 0);
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if (!IsSelfRelativeSecurityDescriptor)
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{
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Result = STATUS_INVALID_PARAMETER;
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goto exit;
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}
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}
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}
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/* according to fastfat, filenames that begin with two backslashes are ok */
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if (sizeof(WCHAR) * 2 <= FileName.Length &&
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L'\\' == FileName.Buffer[1] && L'\\' == FileName.Buffer[0])
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{
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FileName.Length -= sizeof(WCHAR);
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FileName.MaximumLength -= sizeof(WCHAR);
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FileName.Buffer++;
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if (sizeof(WCHAR) * 2 <= FileName.Length &&
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L'\\' == FileName.Buffer[1] && L'\\' == FileName.Buffer[0])
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{
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Result = STATUS_OBJECT_NAME_INVALID;
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goto exit;
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}
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}
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/* check for trailing backslash */
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if (sizeof(WCHAR) * 2/* not empty or root */ <= FileName.Length &&
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L'\\' == FileName.Buffer[FileName.Length / 2 - 1])
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{
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FileName.Length -= sizeof(WCHAR);
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HasTrailingBackslash = TRUE;
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if (sizeof(WCHAR) * 2 <= FileName.Length && L'\\' == FileName.Buffer[FileName.Length / 2 - 1])
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{
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Result = STATUS_OBJECT_NAME_INVALID;
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goto exit;
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}
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}
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/* is this a relative or absolute open? */
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if (0 != RelatedFileObject)
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{
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/* must be a relative path */
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if (sizeof(WCHAR) <= FileName.Length && L'\\' == FileName.Buffer[0])
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{
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Result = STATUS_OBJECT_NAME_INVALID;
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goto exit;
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}
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FSP_FILE_CONTEXT *RelatedFsContext = RelatedFileObject->FsContext;
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ASSERT(0 != RelatedFsContext);
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/*
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* There is no need to lock our accesses of RelatedFileObject->FsContext->FileName,
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* because RelatedFileObject->FsContext->Filename is read-only (after creation) and
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* because RelatedFileObject->FsContext is guaranteed to exist while RelatedFileObject
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* exists.
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*/
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BOOLEAN AppendBackslash =
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sizeof(WCHAR) * 2/* not empty or root */ <= RelatedFsContext->FileName.Length &&
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sizeof(WCHAR) <= FileName.Length && L':' != FileName.Buffer[0];
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Result = FspFileContextCreate(
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RelatedFsContext->FileName.Length + AppendBackslash * sizeof(WCHAR) + FileName.Length,
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&FsContext);
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if (!NT_SUCCESS(Result))
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goto exit;
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Result = RtlAppendUnicodeStringToString(&FsContext->FileName, &RelatedFsContext->FileName);
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ASSERT(NT_SUCCESS(Result));
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if (AppendBackslash)
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{
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Result = RtlAppendUnicodeToString(&FsContext->FileName, L"\\");
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ASSERT(NT_SUCCESS(Result));
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}
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}
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else
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{
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SecurityDescriptorSize = RtlLengthSecurityDescriptor(SecurityDescriptor);
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IsSelfRelativeSecurityDescriptor = RtlValidRelativeSecurityDescriptor(
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SecurityDescriptor, SecurityDescriptorSize, 0);
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if (!IsSelfRelativeSecurityDescriptor)
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return STATUS_INVALID_PARAMETER;
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/* must be an absolute path */
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if (sizeof(WCHAR) <= FileName.Length && L'\\' != FileName.Buffer[0])
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{
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Result = STATUS_OBJECT_NAME_INVALID;
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goto exit;
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}
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Result = FspFileContextCreate(
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FileName.Length,
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&FsContext);
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if (!NT_SUCCESS(Result))
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goto exit;
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}
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}
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/* according to fastfat, filenames that begin with two backslashes are ok */
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if (sizeof(WCHAR) * 2 <= FileName.Length &&
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L'\\' == FileName.Buffer[1] && L'\\' == FileName.Buffer[0])
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{
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FileName.Length -= sizeof(WCHAR);
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FileName.MaximumLength -= sizeof(WCHAR);
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FileName.Buffer++;
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if (sizeof(WCHAR) * 2 <= FileName.Length &&
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L'\\' == FileName.Buffer[1] && L'\\' == FileName.Buffer[0])
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return STATUS_OBJECT_NAME_INVALID;
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}
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/* check for trailing backslash */
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if (sizeof(WCHAR) * 2/* not empty or root */ <= FileName.Length &&
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L'\\' == FileName.Buffer[FileName.Length / 2 - 1])
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{
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FileName.Length -= sizeof(WCHAR);
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HasTrailingBackslash = TRUE;
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if (sizeof(WCHAR) * 2 <= FileName.Length && L'\\' == FileName.Buffer[FileName.Length / 2 - 1])
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return STATUS_OBJECT_NAME_INVALID;
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}
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/* is this a relative or absolute open? */
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if (0 != RelatedFileObject)
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{
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/* must be a relative path */
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if (sizeof(WCHAR) <= FileName.Length && L'\\' == FileName.Buffer[0])
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return STATUS_OBJECT_NAME_INVALID;
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FSP_FILE_CONTEXT *RelatedFsContext = RelatedFileObject->FsContext;
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ASSERT(0 != RelatedFsContext);
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Result = RtlAppendUnicodeStringToString(&FsContext->FileName, &FileName);
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ASSERT(NT_SUCCESS(Result));
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/*
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* There is no need to lock our accesses of RelatedFileObject->FsContext->FileName,
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* because RelatedFileObject->FsContext->Filename is read-only (after creation) and
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* because RelatedFileObject->FsContext is guaranteed to exist while RelatedFileObject
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* exists.
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* From this point forward we MUST remember to delete the FsContext on error.
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*/
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BOOLEAN AppendBackslash =
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sizeof(WCHAR) * 2/* not empty or root */ <= RelatedFsContext->FileName.Length &&
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sizeof(WCHAR) <= FileName.Length && L':' != FileName.Buffer[0];
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Result = FspFileContextCreate(
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RelatedFsContext->FileName.Length + AppendBackslash * sizeof(WCHAR) + FileName.Length,
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&FsContext);
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if (!NT_SUCCESS(Result))
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return Result;
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Result = RtlAppendUnicodeStringToString(&FsContext->FileName, &RelatedFsContext->FileName);
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ASSERT(NT_SUCCESS(Result));
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if (AppendBackslash)
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{
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Result = RtlAppendUnicodeToString(&FsContext->FileName, L"\\");
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ASSERT(NT_SUCCESS(Result));
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}
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}
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else
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{
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/* must be an absolute path */
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if (sizeof(WCHAR) <= FileName.Length && L'\\' != FileName.Buffer[0])
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return STATUS_OBJECT_NAME_INVALID;
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Result = FspFileContextCreate(
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FileName.Length,
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&FsContext);
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if (!NT_SUCCESS(Result))
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return Result;
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}
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Result = RtlAppendUnicodeStringToString(&FsContext->FileName, &FileName);
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ASSERT(NT_SUCCESS(Result));
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/*
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* From this point forward we MUST remember to delete the FsContext on error.
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*/
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/* create the user-mode file system request */
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Result = FspIopCreateRequest(Irp, &FsContext->FileName, SecurityDescriptorSize, &Request);
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if (!NT_SUCCESS(Result))
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{
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FspFileContextDelete(FsContext);
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return Result;
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}
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/* populate the Create request */
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Request->Kind = FspFsctlTransactCreateKind;
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Request->Req.Create.CreateDisposition = CreateDisposition;
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Request->Req.Create.CreateOptions = CreateOptions;
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Request->Req.Create.FileAttributes = FileAttributes;
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Request->Req.Create.SecurityDescriptor = 0 == SecurityDescriptor ? 0 :
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FSP_FSCTL_DEFAULT_ALIGN_UP(FsContext->FileName.Length + sizeof(WCHAR));
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Request->Req.Create.SecurityDescriptorSize = (UINT16)SecurityDescriptorSize;
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Request->Req.Create.AllocationSize = AllocationSize.QuadPart;
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Request->Req.Create.AccessToken = 0;
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Request->Req.Create.DesiredAccess = DesiredAccess;
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Request->Req.Create.ShareAccess = ShareAccess;
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Request->Req.Create.Ea = 0;
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Request->Req.Create.EaSize = 0;
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Request->Req.Create.UserMode = UserMode == RequestorMode;
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Request->Req.Create.HasTraversePrivilege = HasTraversePrivilege;
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Request->Req.Create.OpenTargetDirectory = BooleanFlagOn(Flags, SL_OPEN_TARGET_DIRECTORY);
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Request->Req.Create.CaseSensitive = BooleanFlagOn(Flags, SL_CASE_SENSITIVE);
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/* copy the security descriptor into the request */
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||||
if (IsAbsoluteSecurityDescriptor)
|
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{
|
||||
Result = RtlAbsoluteToSelfRelativeSD(SecurityDescriptor, 0, &SecurityDescriptorSize);
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/* create the user-mode file system request */
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Result = FspIopCreateRequest(Irp, &FsContext->FileName, SecurityDescriptorSize, &Request);
|
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if (!NT_SUCCESS(Result))
|
||||
{
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FspFileContextDelete(FsContext);
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if (STATUS_BAD_DESCRIPTOR_FORMAT == Result || STATUS_BUFFER_TOO_SMALL == Result)
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return STATUS_INVALID_PARAMETER; /* should not happen */
|
||||
return Result;
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||||
goto exit;
|
||||
}
|
||||
}
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||||
else
|
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RtlCopyMemory(Request->Buffer + Request->Req.Create.SecurityDescriptor,
|
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SecurityDescriptor, SecurityDescriptorSize);
|
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|
||||
/* if the user-mode file system is doing access checks, send it the access token */
|
||||
if (FsvrtDeviceExtension->VolumeParams.NoSystemAccessCheck)
|
||||
{
|
||||
Result = ObOpenObjectByPointer(
|
||||
SeQuerySubjectContextToken(&AccessState->SubjectSecurityContext),
|
||||
OBJ_KERNEL_HANDLE, 0, TOKEN_QUERY, 0, KernelMode, &AccessToken);
|
||||
if (!NT_SUCCESS(Result))
|
||||
/* populate the Create request */
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||||
Request->Kind = FspFsctlTransactCreateKind;
|
||||
Request->Req.Create.CreateDisposition = CreateDisposition;
|
||||
Request->Req.Create.CreateOptions = CreateOptions;
|
||||
Request->Req.Create.FileAttributes = FileAttributes;
|
||||
Request->Req.Create.SecurityDescriptor = 0 == SecurityDescriptor ? 0 :
|
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FSP_FSCTL_DEFAULT_ALIGN_UP(FsContext->FileName.Length + sizeof(WCHAR));
|
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Request->Req.Create.SecurityDescriptorSize = (UINT16)SecurityDescriptorSize;
|
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Request->Req.Create.AllocationSize = AllocationSize.QuadPart;
|
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Request->Req.Create.AccessToken = 0;
|
||||
Request->Req.Create.DesiredAccess = DesiredAccess;
|
||||
Request->Req.Create.ShareAccess = ShareAccess;
|
||||
Request->Req.Create.Ea = 0;
|
||||
Request->Req.Create.EaSize = 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)
|
||||
{
|
||||
FspFileContextDelete(FsContext);
|
||||
return Result;
|
||||
Result = RtlAbsoluteToSelfRelativeSD(SecurityDescriptor, 0, &SecurityDescriptorSize);
|
||||
if (!NT_SUCCESS(Result))
|
||||
{
|
||||
FspFileContextDelete(FsContext);
|
||||
if (STATUS_BAD_DESCRIPTOR_FORMAT == Result || STATUS_BUFFER_TOO_SMALL == Result)
|
||||
return STATUS_INVALID_PARAMETER; /* should not happen */
|
||||
goto exit;
|
||||
}
|
||||
}
|
||||
else
|
||||
RtlCopyMemory(Request->Buffer + Request->Req.Create.SecurityDescriptor,
|
||||
SecurityDescriptor, SecurityDescriptorSize);
|
||||
|
||||
/* if the user-mode file system is doing access checks, send it the access token */
|
||||
if (FsvrtDeviceExtension->VolumeParams.NoSystemAccessCheck)
|
||||
{
|
||||
Result = ObOpenObjectByPointer(
|
||||
SeQuerySubjectContextToken(&AccessState->SubjectSecurityContext),
|
||||
OBJ_KERNEL_HANDLE, 0, TOKEN_QUERY, 0, KernelMode, &AccessToken);
|
||||
if (!NT_SUCCESS(Result))
|
||||
{
|
||||
FspFileContextDelete(FsContext);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/* send the kernel handle and change it into a process handle at prepare time */
|
||||
Request->Req.Create.AccessToken = (UINT_PTR)AccessToken;
|
||||
}
|
||||
|
||||
/* send the kernel handle and change it into a process handle at prepare time */
|
||||
Request->Req.Create.AccessToken = (UINT_PTR)AccessToken;
|
||||
}
|
||||
/*
|
||||
* Post the IRP to our Ioq; we do this here instead of at FSP_LEAVE_MJ time,
|
||||
* so that we can FspFileContextDelete() on failure.
|
||||
*/
|
||||
if (!FspIoqPostIrp(&FsvrtDeviceExtension->Ioq, Irp))
|
||||
{
|
||||
/* this can only happen if the Ioq was stopped */
|
||||
ASSERT(FspIoqStopped(&FsvrtDeviceExtension->Ioq));
|
||||
FspFileContextDelete(FsContext);
|
||||
Result = STATUS_CANCELLED;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/*
|
||||
* Post the IRP to our Ioq; we do this here instead of at FSP_LEAVE_MJ time,
|
||||
* so that we can FspFileContextDelete() on failure.
|
||||
*/
|
||||
if (!FspIoqPostIrp(&FsvrtDeviceExtension->Ioq, Irp))
|
||||
exit:;
|
||||
}
|
||||
finally
|
||||
{
|
||||
/* this can only happen if the Ioq was stopped */
|
||||
ASSERT(FspIoqStopped(&FsvrtDeviceExtension->Ioq));
|
||||
FspFileContextDelete(FsContext);
|
||||
return STATUS_CANCELLED;
|
||||
FspDeviceRelease(FsvrtDeviceObject);
|
||||
}
|
||||
|
||||
return STATUS_PENDING;
|
||||
|
||||
Reference in New Issue
Block a user