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sys, dll: reparse point (symbolic link) support: WIP
This commit is contained in:
Bill Zissimopoulos
263
src/dll/fsop.c
263
src/dll/fsop.c
@ -17,25 +17,38 @@
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#include <dll/library.h>
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/*
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* The FspFileSystemOpEnter/FspFileSystemOpLeave functions guard against
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* concurrent accesses. Two concurrency models are provided:
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*
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* 1. A fine-grained concurrency model where file system NAMESPACE accesses
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* are guarded using an exclusive-shared (read-write) lock. File I/O is not
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* guarded and concurrent reads/writes/etc. are possible. [Note that the FSD
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* will still apply an exclusive-shared lock PER INDIVIDUAL FILE, but it will
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* not limit I/O operations for different files.]
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*
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* The fine-grained concurrency model applies the exclusive-shared lock as
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* follows:
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* - EXCL: SetVolumeLabel, Create, Cleanup(Delete), SetInformation(Rename)
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* - SHRD: GetVolumeInfo, Open, SetInformation(Disposition), ReadDirectory
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* - NONE: all other operations
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*
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* 2. A coarse-grained concurrency model where all file system accesses are
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* guarded by a mutually exclusive lock.
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*/
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/* the following definitions appear to be missing from the user mode headers */
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#define SYMLINK_FLAG_RELATIVE 1
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typedef struct _REPARSE_DATA_BUFFER
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{
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ULONG ReparseTag;
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USHORT ReparseDataLength;
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USHORT Reserved;
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union
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{
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struct
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{
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USHORT SubstituteNameOffset;
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USHORT SubstituteNameLength;
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USHORT PrintNameOffset;
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USHORT PrintNameLength;
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ULONG Flags;
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WCHAR PathBuffer[1];
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} SymbolicLinkReparseBuffer;
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struct
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{
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USHORT SubstituteNameOffset;
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USHORT SubstituteNameLength;
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USHORT PrintNameOffset;
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USHORT PrintNameLength;
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WCHAR PathBuffer[1];
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} MountPointReparseBuffer;
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struct
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{
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UCHAR DataBuffer[1];
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} GenericReparseBuffer;
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} DUMMYUNIONNAME;
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} REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
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FSP_API NTSTATUS FspFileSystemOpEnter(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response)
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@ -107,9 +120,34 @@ FSP_API NTSTATUS FspFileSystemOpLeave(FSP_FILE_SYSTEM *FileSystem,
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return STATUS_SUCCESS;
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}
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static inline
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NTSTATUS FspFileSystemResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response)
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{
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NTSTATUS Result = STATUS_INVALID_DEVICE_REQUEST;
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IO_STATUS_BLOCK IoStatus;
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SIZE_T Size;
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if (0 != FileSystem->Interface->ResolveReparsePoints)
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{
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memset(&IoStatus, 0, sizeof IoStatus);
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Size = FSP_FSCTL_TRANSACT_RSP_SIZEMAX - FIELD_OFFSET(FSP_FSCTL_TRANSACT_RSP, Buffer);
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Result = FileSystem->Interface->ResolveReparsePoints(FileSystem,
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(PWSTR)Request->Buffer,
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!!(Request->Req.Create.CreateOptions & FILE_OPEN_REPARSE_POINT),
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&IoStatus,
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Response->Buffer,
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&Size);
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if (STATUS_REPARSE == Result)
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Response->IoStatus.Information = (UINT32)IoStatus.Information;
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}
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return Result;
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}
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static inline
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NTSTATUS FspFileSystemCreateCheck(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response,
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BOOLEAN AllowTraverseCheck, PUINT32 PGrantedAccess,
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PSECURITY_DESCRIPTOR *PSecurityDescriptor)
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{
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@ -128,7 +166,9 @@ NTSTATUS FspFileSystemCreateCheck(FSP_FILE_SYSTEM *FileSystem,
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(Request->Req.Create.CreateOptions & FILE_DIRECTORY_FILE) ?
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FILE_ADD_SUBDIRECTORY : FILE_ADD_FILE,
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PGrantedAccess, PSecurityDescriptor);
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if (NT_SUCCESS(Result))
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if (STATUS_REPARSE == Result)
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Result = FspFileSystemResolveReparsePoints(FileSystem, Request, Response);
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else if (NT_SUCCESS(Result))
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{
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*PGrantedAccess = (MAXIMUM_ALLOWED & Request->Req.Create.DesiredAccess) ?
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FspGetFileGenericMapping()->GenericAll : Request->Req.Create.DesiredAccess;
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@ -139,7 +179,7 @@ NTSTATUS FspFileSystemCreateCheck(FSP_FILE_SYSTEM *FileSystem,
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static inline
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NTSTATUS FspFileSystemOpenCheck(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response,
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BOOLEAN AllowTraverseCheck, PUINT32 PGrantedAccess)
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{
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NTSTATUS Result;
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@ -158,7 +198,9 @@ NTSTATUS FspFileSystemOpenCheck(FSP_FILE_SYSTEM *FileSystem,
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Request->Req.Create.DesiredAccess |
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((Request->Req.Create.CreateOptions & FILE_DELETE_ON_CLOSE) ? DELETE : 0),
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PGrantedAccess);
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if (NT_SUCCESS(Result))
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if (STATUS_REPARSE == Result)
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Result = FspFileSystemResolveReparsePoints(FileSystem, Request, Response);
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else if (NT_SUCCESS(Result))
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{
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if (0 == (Request->Req.Create.DesiredAccess & MAXIMUM_ALLOWED))
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*PGrantedAccess &= ~DELETE | (Request->Req.Create.DesiredAccess & DELETE);
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@ -169,7 +211,7 @@ NTSTATUS FspFileSystemOpenCheck(FSP_FILE_SYSTEM *FileSystem,
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static inline
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NTSTATUS FspFileSystemOverwriteCheck(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response,
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BOOLEAN AllowTraverseCheck, PUINT32 PGrantedAccess)
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{
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NTSTATUS Result;
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@ -191,7 +233,9 @@ NTSTATUS FspFileSystemOverwriteCheck(FSP_FILE_SYSTEM *FileSystem,
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(Supersede ? DELETE : FILE_WRITE_DATA) |
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((Request->Req.Create.CreateOptions & FILE_DELETE_ON_CLOSE) ? DELETE : 0),
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PGrantedAccess);
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if (NT_SUCCESS(Result))
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if (STATUS_REPARSE == Result)
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Result = FspFileSystemResolveReparsePoints(FileSystem, Request, Response);
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else if (NT_SUCCESS(Result))
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{
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if (0 == (Request->Req.Create.DesiredAccess & MAXIMUM_ALLOWED))
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*PGrantedAccess &= ~(DELETE | FILE_WRITE_DATA) |
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@ -201,6 +245,26 @@ NTSTATUS FspFileSystemOverwriteCheck(FSP_FILE_SYSTEM *FileSystem,
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return Result;
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}
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static inline
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NTSTATUS FspFileSystemOpenTargetDirectoryCheck(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response,
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PUINT32 PGrantedAccess)
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{
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NTSTATUS Result;
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/*
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* OpenTargetDirectoryCheck consists of checking the parent directory
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* for the desired access.
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*/
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Result = FspAccessCheck(FileSystem, Request, TRUE, TRUE, Request->Req.Create.DesiredAccess,
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PGrantedAccess);
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if (STATUS_REPARSE == Result)
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Result = FspFileSystemResolveReparsePoints(FileSystem, Request, Response);
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return Result;
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}
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static inline
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NTSTATUS FspFileSystemRenameCheck(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request)
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@ -235,7 +299,9 @@ NTSTATUS FspFileSystemRenameCheck(FSP_FILE_SYSTEM *FileSystem,
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CreateRequest->Size = sizeof CreateRequest +
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Request->Req.SetInformation.Info.Rename.NewFileName.Size;
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CreateRequest->Kind = FspFsctlTransactCreateKind;
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CreateRequest->Req.Create.CreateOptions = FILE_DELETE_ON_CLOSE; /* force read-only check! */
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CreateRequest->Req.Create.CreateOptions =
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FILE_DELETE_ON_CLOSE | /* force read-only check! */
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FILE_OPEN_REPARSE_POINT; /* allow rename over reparse point */
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CreateRequest->Req.Create.AccessToken = Request->Req.SetInformation.Info.Rename.AccessToken;
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CreateRequest->Req.Create.UserMode = TRUE;
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CreateRequest->FileName.Offset = 0;
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@ -248,6 +314,9 @@ NTSTATUS FspFileSystemRenameCheck(FSP_FILE_SYSTEM *FileSystem,
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MemFree(CreateRequest);
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if (STATUS_REPARSE == Result)
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Result = STATUS_SUCCESS; /* file system should not return STATUS_REPARSE during rename */
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return Result;
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}
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@ -260,8 +329,9 @@ static NTSTATUS FspFileSystemOpCreate_FileCreate(FSP_FILE_SYSTEM *FileSystem,
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PVOID FileNode;
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FSP_FSCTL_FILE_INFO FileInfo;
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Result = FspFileSystemCreateCheck(FileSystem, Request, TRUE, &GrantedAccess, &ParentDescriptor);
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if (!NT_SUCCESS(Result))
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Result = FspFileSystemCreateCheck(FileSystem, Request, Response, TRUE,
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&GrantedAccess, &ParentDescriptor);
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if (!NT_SUCCESS(Result) || STATUS_REPARSE == Result)
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return Result;
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Result = FspCreateSecurityDescriptor(FileSystem, Request, ParentDescriptor, &ObjectDescriptor);
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@ -294,8 +364,8 @@ static NTSTATUS FspFileSystemOpCreate_FileOpen(FSP_FILE_SYSTEM *FileSystem,
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PVOID FileNode;
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FSP_FSCTL_FILE_INFO FileInfo;
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Result = FspFileSystemOpenCheck(FileSystem, Request, TRUE, &GrantedAccess);
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if (!NT_SUCCESS(Result))
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Result = FspFileSystemOpenCheck(FileSystem, Request, Response, TRUE, &GrantedAccess);
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if (!NT_SUCCESS(Result) || STATUS_REPARSE == Result)
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return Result;
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FileNode = 0;
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@ -323,8 +393,8 @@ static NTSTATUS FspFileSystemOpCreate_FileOpenIf(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_FILE_INFO FileInfo;
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BOOLEAN Create = FALSE;
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Result = FspFileSystemOpenCheck(FileSystem, Request, TRUE, &GrantedAccess);
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if (!NT_SUCCESS(Result))
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Result = FspFileSystemOpenCheck(FileSystem, Request, Response, TRUE, &GrantedAccess);
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if (!NT_SUCCESS(Result) || STATUS_REPARSE == Result)
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{
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if (STATUS_OBJECT_NAME_NOT_FOUND != Result)
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return Result;
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@ -348,8 +418,9 @@ static NTSTATUS FspFileSystemOpCreate_FileOpenIf(FSP_FILE_SYSTEM *FileSystem,
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if (Create)
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{
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Result = FspFileSystemCreateCheck(FileSystem, Request, FALSE, &GrantedAccess, &ParentDescriptor);
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if (!NT_SUCCESS(Result))
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Result = FspFileSystemCreateCheck(FileSystem, Request, Response, FALSE,
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&GrantedAccess, &ParentDescriptor);
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if (!NT_SUCCESS(Result) || STATUS_REPARSE == Result)
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return Result;
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Result = FspCreateSecurityDescriptor(FileSystem, Request, ParentDescriptor, &ObjectDescriptor);
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@ -384,8 +455,8 @@ static NTSTATUS FspFileSystemOpCreate_FileOverwrite(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_FILE_INFO FileInfo;
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BOOLEAN Supersede = FILE_SUPERSEDE == ((Request->Req.Create.CreateOptions >> 24) & 0xff);
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Result = FspFileSystemOverwriteCheck(FileSystem, Request, TRUE, &GrantedAccess);
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if (!NT_SUCCESS(Result))
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Result = FspFileSystemOverwriteCheck(FileSystem, Request, Response, TRUE, &GrantedAccess);
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if (!NT_SUCCESS(Result) || STATUS_REPARSE == Result)
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return Result;
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FileNode = 0;
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@ -413,8 +484,8 @@ static NTSTATUS FspFileSystemOpCreate_FileOverwriteIf(FSP_FILE_SYSTEM *FileSyste
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FSP_FSCTL_FILE_INFO FileInfo;
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BOOLEAN Create = FALSE;
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Result = FspFileSystemOverwriteCheck(FileSystem, Request, TRUE, &GrantedAccess);
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if (!NT_SUCCESS(Result))
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Result = FspFileSystemOverwriteCheck(FileSystem, Request, Response, TRUE, &GrantedAccess);
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if (!NT_SUCCESS(Result) || STATUS_REPARSE == Result)
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{
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if (STATUS_OBJECT_NAME_NOT_FOUND != Result)
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return Result;
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@ -438,8 +509,9 @@ static NTSTATUS FspFileSystemOpCreate_FileOverwriteIf(FSP_FILE_SYSTEM *FileSyste
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if (Create)
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{
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Result = FspFileSystemCreateCheck(FileSystem, Request, FALSE, &GrantedAccess, &ParentDescriptor);
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if (!NT_SUCCESS(Result))
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Result = FspFileSystemCreateCheck(FileSystem, Request, Response,
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FALSE, &GrantedAccess, &ParentDescriptor);
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if (!NT_SUCCESS(Result) || STATUS_REPARSE == Result)
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return Result;
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Result = FspCreateSecurityDescriptor(FileSystem, Request, ParentDescriptor, &ObjectDescriptor);
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@ -476,9 +548,8 @@ static NTSTATUS FspFileSystemOpCreate_FileOpenTargetDirectory(FSP_FILE_SYSTEM *F
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FSP_FSCTL_FILE_INFO FileInfo;
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UINT32 Information;
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Result = FspAccessCheck(FileSystem, Request, TRUE, TRUE,
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Request->Req.Create.DesiredAccess, &GrantedAccess);
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if (!NT_SUCCESS(Result))
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Result = FspFileSystemOpenTargetDirectoryCheck(FileSystem, Request, Response, &GrantedAccess);
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if (!NT_SUCCESS(Result) || STATUS_REPARSE == Result)
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return Result;
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FileNode = 0;
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@ -819,6 +890,112 @@ FSP_API NTSTATUS FspFileSystemOpQueryDirectory(FSP_FILE_SYSTEM *FileSystem,
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return Result;
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}
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FSP_API NTSTATUS FspFileSystemOpFileSystemControl(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response)
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{
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NTSTATUS Result;
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PREPARSE_DATA_BUFFER SymlinkReparseData;
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SIZE_T Offset, Size;
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Result = STATUS_INVALID_DEVICE_REQUEST;
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switch (Request->Req.FileSystemControl.FsControlCode)
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{
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case FSCTL_GET_REPARSE_POINT:
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if (0 != FileSystem->Interface->GetReparsePoint)
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{
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SymlinkReparseData = (PREPARSE_DATA_BUFFER)Response->Buffer;
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memset(SymlinkReparseData, 0, sizeof *SymlinkReparseData);
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if (1/*!!!: SymbolicLinksOnly*/)
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{
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Size = FSP_FSCTL_TRANSACT_RSP_SIZEMAX - FIELD_OFFSET(FSP_FSCTL_TRANSACT_RSP, Buffer) -
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sizeof(*SymlinkReparseData);
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Size /= 2; /* need space for SubstituteName and PrintName */
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Result = FileSystem->Interface->GetReparsePoint(FileSystem, Request,
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(PVOID)Request->Req.FileSystemControl.UserContext,
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(PWSTR)Request->Buffer,
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SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer,
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&Size);
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if (NT_SUCCESS(Result))
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{
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Offset = 0;
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if (Size > 4 * sizeof(WCHAR) &&
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'\\' == SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer[0] &&
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'?' == SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer[1] &&
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'?' == SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer[2] &&
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'\\' == SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer[3])
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Offset = 4 * sizeof(WCHAR);
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SymlinkReparseData->ReparseTag = IO_REPARSE_TAG_SYMLINK;
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SymlinkReparseData->ReparseDataLength = (USHORT)(
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FIELD_OFFSET(REPARSE_DATA_BUFFER, SymbolicLinkReparseBuffer.PathBuffer) -
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FIELD_OFFSET(REPARSE_DATA_BUFFER, SymbolicLinkReparseBuffer) +
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Size + Size - Offset);
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SymlinkReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset =
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0;
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SymlinkReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength =
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(USHORT)Size;
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SymlinkReparseData->SymbolicLinkReparseBuffer.PrintNameOffset =
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(USHORT)Size;
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SymlinkReparseData->SymbolicLinkReparseBuffer.PrintNameLength =
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(USHORT)(Size - Offset);
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SymlinkReparseData->SymbolicLinkReparseBuffer.Flags =
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Size > 1 * sizeof(WCHAR) &&
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'\\' == SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer[0] ?
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0 : SYMLINK_FLAG_RELATIVE;
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RtlMoveMemory(
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SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer + Size / sizeof(WCHAR),
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SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer + Offset / sizeof(WCHAR),
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(DWORD)(Size - Offset));
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Response->Rsp.FileSystemControl.Buffer.Size = (UINT16)Size;
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}
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}
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else
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{
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Size = FSP_FSCTL_TRANSACT_RSP_SIZEMAX - FIELD_OFFSET(FSP_FSCTL_TRANSACT_RSP, Buffer);
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Result = FileSystem->Interface->GetReparsePoint(FileSystem, Request,
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(PVOID)Request->Req.FileSystemControl.UserContext,
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(PWSTR)Request->Buffer, SymlinkReparseData, &Size);
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if (NT_SUCCESS(Result))
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Response->Rsp.FileSystemControl.Buffer.Size = (UINT16)Size;
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}
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}
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break;
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case FSCTL_SET_REPARSE_POINT:
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if (0 != FileSystem->Interface->SetReparsePoint)
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{
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SymlinkReparseData = (PREPARSE_DATA_BUFFER)
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(Request->Buffer + Request->Req.FileSystemControl.Buffer.Offset);
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if (1/*!!!: SymbolicLinksOnly*/)
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{
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Result = FileSystem->Interface->SetReparsePoint(FileSystem, Request,
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(PVOID)Request->Req.FileSystemControl.UserContext,
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(PWSTR)Request->Buffer,
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SymlinkReparseData->SymbolicLinkReparseBuffer.PathBuffer +
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SymlinkReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength / sizeof(WCHAR),
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SymlinkReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength);
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}
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else
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Result = FileSystem->Interface->SetReparsePoint(FileSystem, Request,
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(PVOID)Request->Req.FileSystemControl.UserContext,
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(PWSTR)Request->Buffer,
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SymlinkReparseData,
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Request->Req.FileSystemControl.Buffer.Size);
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}
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break;
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case FSCTL_DELETE_REPARSE_POINT:
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if (0 != FileSystem->Interface->SetReparsePoint)
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Result = FileSystem->Interface->SetReparsePoint(FileSystem, Request,
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(PVOID)Request->Req.FileSystemControl.UserContext,
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(PWSTR)Request->Buffer, 0, 0);
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break;
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}
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return STATUS_SUCCESS;
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}
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FSP_API NTSTATUS FspFileSystemOpQuerySecurity(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response)
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{
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