new capacity bits (#67)

tests/fixtures/ssti/java/UnsafeFreemarkerProcess.java

@@ -0,0 +1,27 @@
+// Unsafe: Apache FreeMarker constructor takes a tainted template *source*
+// string (the second arg to `new Template(name, reader, cfg)` is read
+// once into the compiled body), then `tpl.process(model, out)` renders
+// it.  Without `TypeKind::Template`, idiomatic `Template tpl = new
+// Template(...); tpl.process(...)` shapes do not type-qualify
+// `tpl.process` to `Template.process`, so the existing flat SSTI rule
+// never fires.
+import freemarker.template.Configuration;
+import freemarker.template.Template;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.util.HashMap;
+import java.util.Map;
+import javax.servlet.http.HttpServletRequest;
+
+public class UnsafeFreemarkerProcess {
+    public String render(HttpServletRequest req) throws Exception {
+        String src = req.getParameter("template");
+        Configuration cfg = new Configuration(Configuration.VERSION_2_3_31);
+        Template tpl = new Template("user", new StringReader(src), cfg);
+        Map<String, Object> model = new HashMap<>();
+        model.put("user", req.getParameter("name"));
+        StringWriter out = new StringWriter();
+        tpl.process(model, out);
+        return out.toString();
+    }
+}