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|
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)
}
|
