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Diffstat (limited to 'cluefs_frontend/fe_dir.go')
-rw-r--r--cluefs_frontend/fe_dir.go180
1 files changed, 180 insertions, 0 deletions
diff --git a/cluefs_frontend/fe_dir.go b/cluefs_frontend/fe_dir.go
new file mode 100644
index 0000000..65d92f1
--- /dev/null
+++ b/cluefs_frontend/fe_dir.go
@@ -0,0 +1,180 @@
+package cluefs_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
+}
+func (d *Dir) Symlink(ctx context.Context, req *fuse.SymlinkRequest) (fusefs.Node, error) {
+ req.Target = d.crfs.EncryptPath(req.Target)
+ req.NewName = d.crfs.EncryptPath(req.NewName)
+ node, err := d.Dir.Symlink(ctx, req)
+ if err != nil {
+ return nil, err
+ }
+
+ clueDir, ok := node.(*cluefs.Dir)
+ if ok {
+ return &Dir {
+ Dir: clueDir,
+ crfs: d.crfs,
+ }, nil
+ } else {
+ clueFile := node.(*cluefs.File)
+ return &File {
+ File: clueFile,
+ crfs: d.crfs,
+ }, nil
+ }
+}
+// We need to overwrite Readlink for both Dir and File. Do both right here to keep them in sync.
+func (d *Dir) Readlink(ctx context.Context, req *fuse.ReadlinkRequest) (string, error) {
+ dest, err := d.Dir.Readlink(ctx, req)
+ if err != nil {
+ return "", err
+ }
+ return d.crfs.DecryptPath(dest)
+}
+func (d *File) Readlink(ctx context.Context, req *fuse.ReadlinkRequest) (string, error) {
+ dest, err := d.File.Readlink(ctx, req)
+ if err != nil {
+ return "", err
+ }
+ return d.crfs.DecryptPath(dest)
+}
+// We need to overwrite Rename for both Dir and File. Do both right here to keep them in sync.
+func (d *Dir) Rename(ctx context.Context, req *fuse.RenameRequest, newDir fusefs.Node) error {
+ req.OldName = d.crfs.EncryptPath(req.OldName)
+ req.NewName = d.crfs.EncryptPath(req.NewName)
+ destDir := newDir.(*Dir)
+ return d.Dir.Rename(ctx, req, destDir.Dir)
+}
+func (d *File) Rename(ctx context.Context, req *fuse.RenameRequest, newDir fusefs.Node) error {
+ req.OldName = d.crfs.EncryptPath(req.OldName)
+ req.NewName = d.crfs.EncryptPath(req.NewName)
+ destDir := newDir.(*Dir)
+ return d.File.Rename(ctx, req, destDir.Dir)
+}