boxdd: Add insecure mode

adapter/security.go

@@ -0,0 +1,19 @@
+package adapter
+
+import (
+	"context"
+
+	"github.com/sagernet/sing/service"
+)
+
+type SecurityPolicy interface {
+	CheckFeature(feature string) error
+}
+
+func CheckSecurityFeature(ctx context.Context, feature string) error {
+	policy := service.FromContext[SecurityPolicy](ctx)
+	if policy == nil {
+		return nil
+	}
+	return policy.CheckFeature(feature)
+}