Improved xattr handling on non-linux systems (#227)

* Fixed xattr filtering for MacOS. "system." and "user." prefixes are only relevant for Linux.
* Small cleanup and additional tests.

1 files changed, 15 insertions, 0 deletions

diff --git a/internal/fusefrontend/xattr_linux.go b/internal/fusefrontend/xattr_linux.go
new file mode 100644
index 0000000..ebe42b1
--- /dev/null
+++ b/internal/fusefrontend/xattr_linux.go
@@ -0,0 +1,15 @@
+// +build linux
+
+// Package fusefrontend interfaces directly with the go-fuse library.
+package fusefrontend
+
+import "strings"
+
+// Only allow the "user" namespace, block "trusted" and "security", as
+// these may be interpreted by the system, and we don't want to cause
+// trouble with our encrypted garbage.
+const xattrUserPrefix = "user."
+
+func disallowedXAttrName(attr string) bool {
+	return !strings.HasPrefix(attr, xattrUserPrefix)
+}