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authorJakob Unterwurzacher2021-06-26 18:39:23 +0200
committerJakob Unterwurzacher2021-06-26 18:49:54 +0200
commitf9f4bd214f772b88233d55c2cf270726bfa603c6 (patch)
treec298c9ffe2d1551c787791514af031db9fff8bad /internal/fusefrontend/ctlsock_interface.go
parentee59b5269be45154107dc6840c7bf810aed18ae2 (diff)
fusefrontend: convert ctlsock from openBackingDir to prepareAtSyscall
openBackingDir will be removed. Also, remove leftover debug printfs.
Diffstat (limited to 'internal/fusefrontend/ctlsock_interface.go')
-rw-r--r--internal/fusefrontend/ctlsock_interface.go55
1 files changed, 35 insertions, 20 deletions
diff --git a/internal/fusefrontend/ctlsock_interface.go b/internal/fusefrontend/ctlsock_interface.go
index f34739a..07d742f 100644
--- a/internal/fusefrontend/ctlsock_interface.go
+++ b/internal/fusefrontend/ctlsock_interface.go
@@ -1,7 +1,6 @@
package fusefrontend
import (
- "fmt"
"path"
"path/filepath"
"strings"
@@ -18,7 +17,7 @@ var _ ctlsocksrv.Interface = &RootNode{} // Verify that interface is implemented
// EncryptPath implements ctlsock.Backend
//
// Symlink-safe through openBackingDir().
-func (rn *RootNode) EncryptPath(plainPath string) (string, error) {
+func (rn *RootNode) EncryptPath(plainPath string) (cipherPath string, err error) {
if plainPath == "" {
// Empty string gets encrypted as empty string
return plainPath, nil
@@ -26,22 +25,42 @@ func (rn *RootNode) EncryptPath(plainPath string) (string, error) {
if rn.args.PlaintextNames {
return plainPath, nil
}
- // Encrypt path level by level using openBackingDir. Pretty inefficient,
- // but does not matter here.
+
+ dirfd, _, errno := rn.prepareAtSyscallMyself()
+ if errno != 0 {
+ return "", errno
+ }
+ defer syscall.Close(dirfd)
+
+ // Encrypt path level by level
parts := strings.Split(plainPath, "/")
- wd := ""
- cPath := ""
- for _, part := range parts {
- wd = filepath.Join(wd, part)
- dirfd, cName, err := rn.openBackingDir(wd)
+ wd := dirfd
+ for i, part := range parts {
+ dirIV, err := nametransform.ReadDirIVAt(wd)
+ if err != nil {
+ return "", err
+ }
+ cPart, err := rn.nameTransform.EncryptAndHashName(part, dirIV)
if err != nil {
return "", err
}
- syscall.Close(dirfd)
- cPath = filepath.Join(cPath, cName)
+ cipherPath = filepath.Join(cipherPath, cPart)
+ // Last path component? We are done.
+ if i == len(parts)-1 {
+ break
+ }
+ // Descend into next directory
+ wd, err = syscallcompat.Openat(wd, cPart, syscall.O_NOFOLLOW|syscall.O_DIRECTORY|syscallcompat.O_PATH, 0)
+ if err != nil {
+ return "", err
+ }
+ // Yes this is somewhat wasteful in terms of used file descriptors:
+ // we keep them all open until the function returns. But it is simple
+ // and reliable.
+ defer syscall.Close(wd)
}
- tlog.Debug.Printf("encryptPath '%s' -> '%s'", plainPath, cPath)
- return cPath, nil
+ tlog.Debug.Printf("EncryptPath %q -> %q", plainPath, cipherPath)
+ return cipherPath, nil
}
// DecryptPath implements ctlsock.Backend
@@ -49,9 +68,9 @@ func (rn *RootNode) EncryptPath(plainPath string) (string, error) {
// DecryptPath is symlink-safe because openBackingDir() and decryptPathAt()
// are symlink-safe.
func (rn *RootNode) DecryptPath(cipherPath string) (plainPath string, err error) {
- dirfd, _, err := rn.openBackingDir("")
- if err != nil {
- return "", err
+ dirfd, _, errno := rn.prepareAtSyscallMyself()
+ if errno != 0 {
+ return "", errno
}
defer syscall.Close(dirfd)
return rn.decryptPathAt(dirfd, cipherPath)
@@ -69,20 +88,17 @@ func (rn *RootNode) decryptPathAt(dirfd int, cipherPath string) (plainPath strin
for i, part := range parts {
dirIV, err := nametransform.ReadDirIVAt(wd)
if err != nil {
- fmt.Printf("ReadDirIV: %v\n", err)
return "", err
}
longPart := part
if nametransform.IsLongContent(part) {
longPart, err = nametransform.ReadLongNameAt(wd, part)
if err != nil {
- fmt.Printf("ReadLongName: %v\n", err)
return "", err
}
}
name, err := rn.nameTransform.DecryptName(longPart, dirIV)
if err != nil {
- fmt.Printf("DecryptName: %v\n", err)
return "", err
}
plainPath = path.Join(plainPath, name)
@@ -100,6 +116,5 @@ func (rn *RootNode) decryptPathAt(dirfd int, cipherPath string) (plainPath strin
// and reliable.
defer syscall.Close(wd)
}
-
return plainPath, nil
}