From c03fc46a5150715bf6aee20ce4b89d9704141220 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Thu, 10 Nov 2016 23:32:51 +0100
Subject: ctlsock: implement EncryptPath for reverse mode, add tests

---
 internal/fusefrontend_reverse/ctlsock_interface.go | 30 ++++++++++++++++++----
 1 file changed, 25 insertions(+), 5 deletions(-)

(limited to 'internal/fusefrontend_reverse/ctlsock_interface.go')

diff --git a/internal/fusefrontend_reverse/ctlsock_interface.go b/internal/fusefrontend_reverse/ctlsock_interface.go
index 376814d..1f02fc1 100644
--- a/internal/fusefrontend_reverse/ctlsock_interface.go
+++ b/internal/fusefrontend_reverse/ctlsock_interface.go
@@ -1,19 +1,39 @@
 package fusefrontend_reverse
 
 import (
-	"errors"
+	"path/filepath"
+	"strings"
+	"syscall"
 
 	"github.com/rfjakob/gocryptfs/internal/ctlsock"
+	"github.com/rfjakob/gocryptfs/internal/nametransform"
 )
 
 var _ ctlsock.Interface = &ReverseFS{} // Verify that interface is implemented.
 
-// EncryptPath implements ctlsock.Backend
+// EncryptPath implements ctlsock.Backend.
+// This is actually not used inside reverse mode, but we implement it because
+// third-party tools want to encrypt paths through the control socket.
 func (rfs *ReverseFS) EncryptPath(plainPath string) (string, error) {
-	return "", errors.New("Not implemented")
+	if rfs.args.PlaintextNames || plainPath == "" {
+		return plainPath, nil
+	}
+	cipherPath := ""
+	parts := strings.Split(plainPath, "/")
+	for _, part := range parts {
+		dirIV := derivePathIV(cipherPath, ivPurposeDirIV)
+		encryptedPart := rfs.nameTransform.EncryptName(part, dirIV)
+		if rfs.args.LongNames && len(encryptedPart) > syscall.NAME_MAX {
+			encryptedPart = nametransform.HashLongName(encryptedPart)
+		}
+		cipherPath = filepath.Join(cipherPath, encryptedPart)
+	}
+	return cipherPath, nil
 }
 
 // DecryptPath implements ctlsock.Backend
-func (rfs *ReverseFS) DecryptPath(plainPath string) (string, error) {
-	return rfs.decryptPath(plainPath)
+func (rfs *ReverseFS) DecryptPath(cipherPath string) (string, error) {
+	p, err := rfs.decryptPath(cipherPath)
+	//fmt.Printf("rfs DecryptPath: %q -> %q %v\n", cipherPath, p, err)
+	return p, err
 }
-- 
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