aboutsummaryrefslogtreecommitdiff
path: root/internal/fusefrontend_reverse/rpath.go
diff options
context:
space:
mode:
authorJakob Unterwurzacher2020-08-01 20:47:59 +0200
committerJakob Unterwurzacher2020-08-01 21:14:10 +0200
commit13dc7657ba0aac4da3f4b80ba231a919fdfae0f5 (patch)
treed13781bacb4a02327f519d399e946f83fd13e5c7 /internal/fusefrontend_reverse/rpath.go
parentdd3d8c100bc9e84c44b2efb55e536b2fc0ded37e (diff)
v2api/reverse: move old fusefrontend_reverse out of the way
fusefrontend_reverse -> fusefrontend_reverse_v1api
Diffstat (limited to 'internal/fusefrontend_reverse/rpath.go')
-rw-r--r--internal/fusefrontend_reverse/rpath.go113
1 files changed, 0 insertions, 113 deletions
diff --git a/internal/fusefrontend_reverse/rpath.go b/internal/fusefrontend_reverse/rpath.go
deleted file mode 100644
index 2da8379..0000000
--- a/internal/fusefrontend_reverse/rpath.go
+++ /dev/null
@@ -1,113 +0,0 @@
-package fusefrontend_reverse
-
-import (
- "encoding/base64"
- "path/filepath"
- "strings"
- "syscall"
-
- "github.com/rfjakob/gocryptfs/internal/nametransform"
- "github.com/rfjakob/gocryptfs/internal/pathiv"
- "github.com/rfjakob/gocryptfs/internal/syscallcompat"
- "github.com/rfjakob/gocryptfs/internal/tlog"
-)
-
-// abs basically returns storage dir + "/" + relPath.
-// It takes an error parameter so it can directly wrap decryptPath like this:
-// a, err := rfs.abs(rfs.decryptPath(relPath))
-// abs never generates an error on its own. In other words, abs(p, nil) never
-// fails.
-func (rfs *ReverseFS) abs(relPath string, err error) (string, error) {
- if err != nil {
- return "", err
- }
- return filepath.Join(rfs.args.Cipherdir, relPath), nil
-}
-
-// rDecryptName decrypts the ciphertext name "cName", given the dirIV of the
-// directory "cName" lies in. The relative plaintext path to the directory
-// "pDir" is used if a "gocryptfs.longname.XYZ.name" must be resolved.
-func (rfs *ReverseFS) rDecryptName(cName string, dirIV []byte, pDir string) (pName string, err error) {
- nameType := nametransform.NameType(cName)
- if nameType == nametransform.LongNameNone {
- pName, err = rfs.nameTransform.DecryptName(cName, dirIV)
- if err != nil {
- // We get lots of decrypt requests for names like ".Trash" that
- // are invalid base64. Convert them to ENOENT so the correct
- // error gets returned to the user.
- if _, ok := err.(base64.CorruptInputError); ok {
- return "", syscall.ENOENT
- }
- // Stat attempts on the link target of encrypted symlinks.
- // These are always valid base64 but the length is not a
- // multiple of 16.
- if err == syscall.EBADMSG {
- return "", syscall.ENOENT
- }
- return "", err
- }
- } else if nameType == nametransform.LongNameContent {
- pName, err = rfs.findLongnameParent(pDir, dirIV, cName)
- if err != nil {
- return "", err
- }
- } else {
- // It makes no sense to decrypt a ".name" file. This is a virtual file
- // that has no representation in the plaintext filesystem. ".name"
- // files should have already been handled in virtualfile.go.
- tlog.Warn.Printf("rDecryptName: cannot decrypt virtual file %q", cName)
- return "", syscall.EINVAL
- }
- return pName, nil
-}
-
-// decryptPath decrypts a relative ciphertext path to a relative plaintext
-// path.
-func (rfs *ReverseFS) decryptPath(relPath string) (string, error) {
- if rfs.args.PlaintextNames || relPath == "" {
- return relPath, nil
- }
- // Check if the parent dir is in the cache
- cDir := nametransform.Dir(relPath)
- dirIV, pDir := rPathCache.lookup(cDir)
- if dirIV != nil {
- cName := filepath.Base(relPath)
- pName, err := rfs.rDecryptName(cName, dirIV, pDir)
- if err != nil {
- return "", err
- }
- return filepath.Join(pDir, pName), nil
- }
- parts := strings.Split(relPath, "/")
- var transformedParts []string
- for i := range parts {
- // Start at the top and recurse
- currentCipherDir := filepath.Join(parts[:i]...)
- currentPlainDir := filepath.Join(transformedParts[:i]...)
- dirIV = pathiv.Derive(currentCipherDir, pathiv.PurposeDirIV)
- transformedPart, err := rfs.rDecryptName(parts[i], dirIV, currentPlainDir)
- if err != nil {
- return "", err
- }
- transformedParts = append(transformedParts, transformedPart)
- }
- pRelPath := filepath.Join(transformedParts...)
- rPathCache.store(cDir, dirIV, nametransform.Dir(pRelPath))
- return pRelPath, nil
-}
-
-// openBackingDir receives an already decrypted relative path
-// "pRelPath", opens the directory that contains the target file/dir
-// 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 (rfs *ReverseFS) openBackingDir(pRelPath string) (dirfd int, pName string, err error) {
- // Open directory, safe against symlink races
- pDir := filepath.Dir(pRelPath)
- dirfd, err = syscallcompat.OpenDirNofollow(rfs.args.Cipherdir, pDir)
- if err != nil {
- return -1, "", err
- }
- pName = filepath.Base(pRelPath)
- return dirfd, pName, nil
-}