hardcoresushi/libgocryptfs
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v2api/reverse: add missing decryptPath call openBackingDir

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This commit is contained in:
Jakob Unterwurzacher 2020-08-01 23:06:35 +02:00
parent 6c26cda531
commit 47d8f56b7f
2 changed files with 20 additions and 12 deletions
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12
internal/fusefrontend_reverse/node.go
View File

@ -21,14 +21,14 @@ type Node struct {
// Lookup - FUSE call for discovering a file.
// TODO handle virtual files
func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (ch *fs.Inode, errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscall(name)
dirfd, pName, errno := n.prepareAtSyscall(name)
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// Get device number and inode number into `st`
st, err := syscallcompat.Fstatat2(dirfd, cName, unix.AT_SYMLINK_NOFOLLOW)
st, err := syscallcompat.Fstatat2(dirfd, pName, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return nil, fs.ToErrno(err)
}
@ -37,7 +37,7 @@ func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (ch
ch = n.newChild(ctx, st, out)
// Translate ciphertext size in `out.Attr.Size` to plaintext size
n.translateSize(dirfd, cName, &out.Attr)
n.translateSize(dirfd, pName, &out.Attr)
return ch, 0
}
@ -51,13 +51,13 @@ func (n *Node) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut)
return f.(fs.FileGetattrer).Getattr(ctx, out)
}
dirfd, cName, errno := n.prepareAtSyscall("")
dirfd, pName, errno := n.prepareAtSyscall("")
if errno != 0 {
return
}
defer syscall.Close(dirfd)
st, err := syscallcompat.Fstatat2(dirfd, cName, unix.AT_SYMLINK_NOFOLLOW)
st, err := syscallcompat.Fstatat2(dirfd, pName, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return fs.ToErrno(err)
}
@ -68,7 +68,7 @@ func (n *Node) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut)
out.Attr.FromStat(st)
// Translate ciphertext size in `out.Attr.Size` to plaintext size
n.translateSize(dirfd, cName, &out.Attr)
n.translateSize(dirfd, pName, &out.Attr)
if rn.args.ForceOwner != nil {
out.Owner = *rn.args.ForceOwner

20
internal/fusefrontend_reverse/rpath.go
View File

@ -64,11 +64,11 @@ func (rfs *RootNode) rDecryptName(cName string, dirIV []byte, pDir string) (pNam
// decryptPath decrypts a relative ciphertext path to a relative plaintext
// path.
func (rn *RootNode) decryptPath(relPath string) (string, error) {
if rn.args.PlaintextNames || relPath == "" {
return relPath, nil
func (rn *RootNode) decryptPath(cPath string) (string, error) {
if rn.args.PlaintextNames || cPath == "" {
return cPath, nil
}
parts := strings.Split(relPath, "/")
parts := strings.Split(cPath, "/")
var transformedParts []string
for i := range parts {
// Start at the top and recurse
@ -90,12 +90,20 @@ func (rn *RootNode) decryptPath(relPath string) (string, error) {
// and returns the fd to the directory and the decrypted name of the
// target file. The fd/name pair is intended for use with fchownat and
// friends.
func (rn *RootNode) openBackingDir(pRelPath string) (dirfd int, pName string, err error) {
func (rn *RootNode) openBackingDir(cPath string) (dirfd int, pName string, err error) {
defer func() {
tlog.Debug.Printf("openBackingDir %q -> %d %q %v\n", cPath, dirfd, pName, err)
}()
dirfd = -1
pRelPath, err := rn.decryptPath(cPath)
if err != nil {
return
}
// Open directory, safe against symlink races
pDir := filepath.Dir(pRelPath)
dirfd, err = syscallcompat.OpenDirNofollow(rn.args.Cipherdir, pDir)
if err != nil {
return -1, "", err
return
}
pName = filepath.Base(pRelPath)
return dirfd, pName, nil