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authorJakob Unterwurzacher2021-08-20 17:06:18 +0200
committerJakob Unterwurzacher2021-08-20 17:06:18 +0200
commitfbccb160438aba6f1e16b26a982122c726afee1a (patch)
tree1faac5ad3587a302fff40a8354382cda21823f3a /internal/fusefrontend_reverse/rpath.go
parent14bf80301b4f3f1fb56f2f0b73de0dcc4aab5216 (diff)
-deterministic-names: implement for reverse mode, too
Diffstat (limited to 'internal/fusefrontend_reverse/rpath.go')
-rw-r--r--internal/fusefrontend_reverse/rpath.go14
1 files changed, 13 insertions, 1 deletions
diff --git a/internal/fusefrontend_reverse/rpath.go b/internal/fusefrontend_reverse/rpath.go
index 199473b..7ebedd7 100644
--- a/internal/fusefrontend_reverse/rpath.go
+++ b/internal/fusefrontend_reverse/rpath.go
@@ -2,6 +2,7 @@ package fusefrontend_reverse
import (
"encoding/base64"
+ "log"
"path/filepath"
"strings"
"syscall"
@@ -72,7 +73,7 @@ func (rn *RootNode) decryptPath(cPath string) (string, error) {
// Start at the top and recurse
currentCipherDir := filepath.Join(parts[:i]...)
currentPlainDir := filepath.Join(transformedParts[:i]...)
- dirIV := pathiv.Derive(currentCipherDir, pathiv.PurposeDirIV)
+ dirIV := rn.deriveDirIV(currentCipherDir)
transformedPart, err := rn.rDecryptName(parts[i], dirIV, currentPlainDir)
if err != nil {
return "", err
@@ -83,6 +84,17 @@ func (rn *RootNode) decryptPath(cPath string) (string, error) {
return pRelPath, nil
}
+// deriveDirIV wraps pathiv.Derive but takes DeterministicNames into account.
+func (rn *RootNode) deriveDirIV(cPath string) []byte {
+ if rn.args.PlaintextNames {
+ log.Panic("BUG: deriveDirIV called but PlaintextNames is set")
+ }
+ if rn.args.DeterministicNames {
+ return make([]byte, nametransform.DirIVLen)
+ }
+ return pathiv.Derive(cPath, pathiv.PurposeDirIV)
+}
+
// 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