fusefrontend: allow slashes in xattr names

xattr names have fewer restrictions than file names,
relax the validation.

Fixes https://github.com/rfjakob/gocryptfs/issues/627

2 files changed, 2 insertions, 6 deletions

diff --git a/internal/fusefrontend/node_xattr.go b/internal/fusefrontend/node_xattr.go
index 09ee5ef..44bc502 100644
--- a/internal/fusefrontend/node_xattr.go
+++ b/internal/fusefrontend/node_xattr.go
@@ -15,10 +15,6 @@ import (
 // -1 as uint32
 const minus1 = ^uint32(0)
 
-// xattr names are encrypted like file names, but with a fixed IV.
-// Padded with "_xx" for length 16.
-var xattrNameIV = []byte("xattr_name_iv_xx")
-
 // We store encrypted xattrs under this prefix plus the base64-encoded
 // encrypted original name.
 var xattrStorePrefix = "user.gocryptfs."
diff --git a/internal/fusefrontend/root_node.go b/internal/fusefrontend/root_node.go
index 7221be6..39cdef7 100644
--- a/internal/fusefrontend/root_node.go
+++ b/internal/fusefrontend/root_node.go
@@ -268,7 +268,7 @@ func (rn *RootNode) decryptXattrValue(cData []byte) (data []byte, err error) {
 // encryptXattrName transforms "user.foo" to "user.gocryptfs.a5sAd4XAa47f5as6dAf"
 func (rn *RootNode) encryptXattrName(attr string) (string, error) {
 	// xattr names are encrypted like file names, but with a fixed IV.
-	cAttr, err := rn.nameTransform.EncryptName(attr, xattrNameIV)
+	cAttr, err := rn.nameTransform.EncryptXattrName(attr)
 	if err != nil {
 		return "", err
 	}
@@ -282,7 +282,7 @@ func (rn *RootNode) decryptXattrName(cAttr string) (attr string, err error) {
 	}
 	// Strip "user.gocryptfs." prefix
 	cAttr = cAttr[len(xattrStorePrefix):]
-	attr, err = rn.nameTransform.DecryptName(cAttr, xattrNameIV)
+	attr, err = rn.nameTransform.DecryptXattrName(cAttr)
 	if err != nil {
 		return "", err
 	}