From af0ae03db23f845dbcf8a6738057222ce7986bd8 Mon Sep 17 00:00:00 2001 From: Jakob Unterwurzacher Date: Mon, 7 Sep 2015 21:10:42 +0200 Subject: Rename frontend to "cluefs_frontend" Enables adding another frontend later --- frontend/fe_checks.go | 31 ---------- frontend/fe_dir.go | 131 ------------------------------------------- frontend/fe_file.go | 152 -------------------------------------------------- frontend/fe_fs.go | 46 --------------- 4 files changed, 360 deletions(-) delete mode 100644 frontend/fe_checks.go delete mode 100644 frontend/fe_dir.go delete mode 100644 frontend/fe_file.go delete mode 100644 frontend/fe_fs.go (limited to 'frontend') diff --git a/frontend/fe_checks.go b/frontend/fe_checks.go deleted file mode 100644 index 30720f6..0000000 --- a/frontend/fe_checks.go +++ /dev/null @@ -1,31 +0,0 @@ -package frontend - -import ( - "bazil.org/fuse/fs" -) - -// Compile-time interface checks. -var _ fs.FS = (*FS)(nil) -var _ fs.FSStatfser = (*FS)(nil) - -var _ fs.Node = (*Dir)(nil) -var _ fs.NodeCreater = (*Dir)(nil) -var _ fs.NodeMkdirer = (*Dir)(nil) -var _ fs.NodeRemover = (*Dir)(nil) -var _ fs.NodeRenamer = (*Dir)(nil) -var _ fs.HandleReadDirAller = (*Dir)(nil) - -var _ fs.HandleReader = (*File)(nil) -var _ fs.HandleWriter = (*File)(nil) -var _ fs.Node = (*File)(nil) -var _ fs.NodeOpener = (*File)(nil) -var _ fs.NodeSetattrer = (*File)(nil) - -func foo(h fs.HandleReadDirAller) { - -} - -func init() { - var d Dir - foo(&d) -} diff --git a/frontend/fe_dir.go b/frontend/fe_dir.go deleted file mode 100644 index 9849968..0000000 --- a/frontend/fe_dir.go +++ /dev/null @@ -1,131 +0,0 @@ -package frontend - -// frontend sits between FUSE and ClueFS -// and uses cryptfs for all crypto operations -// -// cryptfs -// ^ -// | -// v -// FUSE <-> frontend <-> ClueFS -// -// This file handles directories - -import ( - "fmt" - "github.com/rfjakob/gocryptfs/cryptfs" - "github.com/rfjakob/cluefs/lib/cluefs" - "bazil.org/fuse" - fusefs "bazil.org/fuse/fs" - "golang.org/x/net/context" -) - -type Dir struct { - *cluefs.Dir - - crfs *cryptfs.CryptFS -} - -func NewDir(parent string, name string, fs *FS) *Dir { - cryptfs.Debug.Printf("NewDir parent=%s name=%s\n", parent, name) - return &Dir { - Dir: cluefs.NewDir(parent, name, fs.ClueFS), - crfs: fs.CryptFS, - } -} - -func (d *Dir) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fusefs.Handle, error) { - cryptfs.Debug.Printf("Open\n") - h, err := d.Dir.Open(ctx, req, resp) - if err != nil { - return nil, err - } - clueDir := h.(*cluefs.Dir) - - return &Dir { - Dir: clueDir, - crfs: d.crfs, - }, nil -} - -func (d *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (fusefs.Node, error) { - cryptfs.Debug.Printf("Lookup %s\n", req.Name) - req.Name = d.crfs.EncryptPath(req.Name) - node, err := d.Dir.Lookup(ctx, req, resp) - if err != nil { - return nil, err - } - clueDir, ok := node.(*cluefs.Dir) - if ok { - return &Dir { - Dir: clueDir, - crfs: d.crfs, - }, nil - } else { - resp.Attr.Size = d.crfs.PlainSize(resp.Attr.Size) - clueFile := node.(*cluefs.File) - return &File { - File: clueFile, - crfs: d.crfs, - }, nil - } -} - -func (d *Dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) { - cryptfs.Debug.Printf("ReadDirAll\n") - entries, err := d.Dir.ReadDirAll(ctx) - if err != nil { - return nil, err - } - var decrypted []fuse.Dirent - for _, e := range entries { - if e.Name == "." || e.Name == ".." { - decrypted = append(decrypted, e) - continue - } - newName, err := d.crfs.DecryptPath(e.Name) - if err != nil { - fmt.Printf("ReadDirAll: Error decoding \"%s\": %s\n", e.Name, err.Error()) - continue - } - e.Name = newName - decrypted = append(decrypted, e) - } - return decrypted, nil -} - -func (d *Dir) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fusefs.Node, error) { - cryptfs.Debug.Printf("Mkdir %s\n", req.Name) - req.Name = d.crfs.EncryptPath(req.Name) - n, err := d.Dir.Mkdir(ctx, req) - if err != nil { - return nil, err - } - clueDir := n.(*cluefs.Dir) - return &Dir { - Dir: clueDir, - crfs: d.crfs, - }, nil -} - -func (d *Dir) Remove(ctx context.Context, req *fuse.RemoveRequest) error { - cryptfs.Debug.Printf("Remove\n") - req.Name = d.crfs.EncryptPath(req.Name) - return d.Dir.Remove(ctx, req) -} - -func (d *Dir) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.CreateResponse) (fusefs.Node, fusefs.Handle, error) { - cryptfs.Debug.Printf("Create\n") - req.Flags, _ = fixFlags(req.Flags) - req.Name = d.crfs.EncryptPath(req.Name) - n, _, err := d.Dir.Create(ctx, req, resp) - if err != nil { - return nil, nil, err - } - clueFile := n.(*cluefs.File) - cryptFile := &File { - File: clueFile, - crfs: d.crfs, - } - return cryptFile, cryptFile, nil -} diff --git a/frontend/fe_file.go b/frontend/fe_file.go deleted file mode 100644 index 4679589..0000000 --- a/frontend/fe_file.go +++ /dev/null @@ -1,152 +0,0 @@ -package frontend - -// frontend sits between FUSE and ClueFS -// and uses cryptfs for all crypto operations -// -// cryptfs -// ^ -// | -// v -// FUSE <-> frontend <-> ClueFS -// -// This file handles files access - -import ( - "fmt" - "github.com/rfjakob/gocryptfs/cryptfs" - "github.com/rfjakob/cluefs/lib/cluefs" - - "bazil.org/fuse" - fusefs "bazil.org/fuse/fs" - "golang.org/x/net/context" -) - -func fixFlags(flags fuse.OpenFlags) (fuse.OpenFlags, bool) { - cryptfs.Debug.Printf("fixFlags: Before: %s\n", flags.String()) - var writeOnly bool - // We always need read access to do read-modify-write cycles - if flags & fuse.OpenWriteOnly > 0 { - flags = flags &^ fuse.OpenWriteOnly - flags = flags | fuse.OpenReadWrite - writeOnly = true - } - // We also cannot open the file in append mode, we need to seek back for RMW - flags = flags &^ fuse.OpenAppend - cryptfs.Debug.Printf("fixFlags: After: %s\n", flags.String()) - return flags, writeOnly -} - -func max(x int, y int) int { - if x > y { - return x - } - return y -} - -type File struct { - *cluefs.File - crfs *cryptfs.CryptFS - // Remember if the file is supposed to be write-only - writeOnly bool -} - -func (f *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fusefs.Handle, error) { - cryptfs.Debug.Printf("File.Open\n") - - req.Flags, f.writeOnly = fixFlags(req.Flags) - - h, err := f.File.Open(ctx, req, resp) - if err != nil { - return nil, err - } - clueFile := h.(*cluefs.File) - return &File { - File: clueFile, - crfs: f.crfs, - }, nil -} - -func (f *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error { - - cryptfs.Debug.Printf("Read: o=%d l=%d\n", req.Offset, req.Size) - - // Read the backing ciphertext in one go - iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(req.Size)) - var cipherReq fuse.ReadRequest - var cipherResp fuse.ReadResponse - o, l := f.crfs.JoinCiphertextRange(iblocks) - cipherResp.Data = make([]byte, int(l)) - cipherReq.Offset = int64(o) - cipherReq.Size = int(l) - cryptfs.Debug.Printf("Read: cipherReq o=%d l=%d\n", o, l) - err := f.File.Read(ctx, &cipherReq, &cipherResp) - if err != nil { - return err - } - - // Decrypt it - plaintext, err := f.crfs.DecryptBlocks(cipherResp.Data) - if err != nil { - resp.Data = plaintext - return err - } - // Crop down to relevant part - resp.Data = f.crfs.CropPlaintext(plaintext, iblocks) - - return nil -} - -func (f *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error { - cryptfs.Debug.Printf("File.Write\n") - resp.Size = 0 - iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(len(req.Data))) - var blockData []byte - for _, ib := range iblocks { - if ib.IsPartial() { - // RMW - cryptfs.Debug.Printf("RMW\n") - blockData = make([]byte, f.crfs.PlainBS()) - var readReq fuse.ReadRequest - var readResp fuse.ReadResponse - o, l := ib.PlaintextRange() - readReq.Offset = int64(o) - readReq.Size = int(l) - err := f.Read(ctx, &readReq, &readResp) - if err != nil { - return err - } - copy(blockData, readResp.Data) - copy(blockData[ib.Offset:ib.Offset+ib.Length], req.Data) - blockLen := max(len(readResp.Data), int(ib.Offset+ib.Length)) - blockData = blockData[0:blockLen] - } else { - blockData = req.Data[0:f.crfs.PlainBS()] - } - ciphertext := f.crfs.EncryptBlock(blockData) - var partReq fuse.WriteRequest - var partResp fuse.WriteResponse - o, _ := ib.CiphertextRange() - partReq.Data = ciphertext - partReq.Offset = int64(o) - err := f.File.Write(ctx, &partReq, &partResp) - if err != nil { - fmt.Printf("Write failure: %s\n", err.Error()) - return err - } - // Remove written data from the front of the request - cryptfs.Debug.Printf("req.Data[%d:%d]\n", int(ib.Length), len(req.Data)) - req.Data = req.Data[int(ib.Length):len(req.Data)] - resp.Size += int(ib.Length) - } - return nil -} - -func (f *File) Attr(ctx context.Context, attr *fuse.Attr) error { - cryptfs.Debug.Printf("Attr\n") - err := f.File.Node.Attr(ctx, attr) - if err != nil { - return err - } - attr.Size = f.crfs.PlainSize(attr.Size) - return nil -} diff --git a/frontend/fe_fs.go b/frontend/fe_fs.go deleted file mode 100644 index d1fa5b1..0000000 --- a/frontend/fe_fs.go +++ /dev/null @@ -1,46 +0,0 @@ -package frontend - -// frontend sits between FUSE and ClueFS -// and uses cryptfs for all crypto operations -// -// cryptfs -// ^ -// | -// v -// FUSE <-> frontend <-> ClueFS -// -// This file handles just the root directory - -import ( - "github.com/rfjakob/gocryptfs/cryptfs" - "github.com/rfjakob/cluefs/lib/cluefs" - fusefs "bazil.org/fuse/fs" -) - -type FS struct { - *cryptfs.CryptFS - *cluefs.ClueFS - backing string -} - -type nullTracer struct {} - -func (nullTracer) Trace(op cluefs.FsOperTracer) {} - -func NewFS(key [16]byte, backing string, useOpenssl bool) (*FS, error) { - var tracer nullTracer - clfs, err := cluefs.NewClueFS(backing, tracer) - if err != nil { - return nil, err - } - return &FS { - CryptFS: cryptfs.NewCryptFS(key, useOpenssl), - ClueFS: clfs, - backing: backing, - }, nil -} - -func (fs *FS) Root() (fusefs.Node, error) { - cryptfs.Debug.Printf("Root\n") - return NewDir("", fs.backing, fs), nil -} -- cgit v1.2.3