Add missing PlaintextNames checks in OpenDir, Mkdir, Rmdir, initDir

Plaintextnames support has bitrotted during the DirIV additions,
this needs test cases. Will be added in a future patch.

Fixes issue #9.

2 files changed, 22 insertions, 11 deletions

diff --git a/main.go b/main.go
index 06864d5..1fdd242 100644
--- a/main.go
+++ b/main.go
@@ -61,11 +61,13 @@ func initDir(args *argContainer) {
 		os.Exit(ERREXIT_INIT)
 	}
 
-	// Create gocryptfs.diriv in the root dir
-	err = cryptfs.WriteDirIV(args.cipherdir)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(ERREXIT_INIT)
+	if args.diriv && !args.plaintextnames {
+		// Create gocryptfs.diriv in the root dir
+		err = cryptfs.WriteDirIV(args.cipherdir)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(ERREXIT_INIT)
+		}
 	}
 
 	cryptfs.Info.Printf("The filesystem is now ready for mounting.\n")
diff --git a/pathfs_frontend/fs.go b/pathfs_frontend/fs.go
index 0f462b0..8d05c02 100644
--- a/pathfs_frontend/fs.go
+++ b/pathfs_frontend/fs.go
@@ -90,7 +90,7 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
 			return nil, fuse.ToStatus(err)
 		}
 	}
-	// Decrypt filenames
+	// Filter and decrypt filenames
 	var plain []fuse.DirEntry
 	for i := range cipherEntries {
 		cName := cipherEntries[i].Name
@@ -102,11 +102,13 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
 			// silently ignore "gocryptfs.diriv" everywhere if dirIV is enabled
 			continue
 		}
-		var name string
-		name, err = fs.CryptFS.DecryptName(cName, cachedIV, fs.args.EMENames)
-		if err != nil {
-			cryptfs.Warn.Printf("Invalid name \"%s\" in dir \"%s\": %s\n", cName, dirName, err)
-			continue
+		var name string = cName
+		if !fs.args.PlaintextNames {
+			name, err = fs.CryptFS.DecryptName(cName, cachedIV, fs.args.EMENames)
+			if err != nil {
+				cryptfs.Warn.Printf("Invalid name \"%s\" in dir \"%s\": %s\n", cName, dirName, err)
+				continue
+			}
 		}
 		cipherEntries[i].Name = name
 		plain = append(plain, cipherEntries[i])
@@ -251,6 +253,10 @@ func (fs *FS) Mkdir(relPath string, mode uint32, context *fuse.Context) (code fu
 	if err != nil {
 		return fuse.ToStatus(err)
 	}
+	if !fs.args.DirIV {
+		return fuse.ToStatus(os.Mkdir(encPath, os.FileMode(mode)))
+	}
+
 	// The new directory may take the place of an older one that is still in the cache
 	fs.CryptFS.DirIVCacheEnc.Clear()
 	// Create directory
@@ -290,6 +296,9 @@ func (fs *FS) Rmdir(name string, context *fuse.Context) (code fuse.Status) {
 	if err != nil {
 		return fuse.ToStatus(err)
 	}
+	if !fs.args.DirIV {
+		return fuse.ToStatus(syscall.Rmdir(encPath))
+	}
 
 	// If the directory is not empty besides gocryptfs.diriv, do not even
 	// attempt the dance around gocryptfs.diriv.