improve wall filter, add allowDoPrivileged

src/main/java/com/alibaba/druid/wall/WallConfig.java

@@ -57,6 +57,8 @@ public class WallConfig implements WallConfigMBean {
 
     private boolean             mustParameterized          = false;
 
+    private boolean             allowDoPrivileged          = false;
+
     protected final Set<String> permitFunctions            = new HashSet<String>();
     protected final Set<String> permitTables               = new HashSet<String>();
     protected final Set<String> permitSchemas              = new HashSet<String>();
@@ -73,6 +75,14 @@ public class WallConfig implements WallConfigMBean {
 
     }
 
+    public boolean isAllowDoPrivileged() {
+        return allowDoPrivileged;
+    }
+
+    public void setAllowDoPrivileged(boolean allowDoPrivileged) {
+        this.allowDoPrivileged = allowDoPrivileged;
+    }
+
     public boolean isInited() {
         return inited;
     }

src/main/java/com/alibaba/druid/wall/WallProvider.java

@@ -120,7 +120,7 @@ public abstract class WallProvider {
     }
 
     public List<Violation> check(String sql) {
-        if (privileged.get() == Boolean.TRUE) {
+        if (config.isAllowDoPrivileged() && privileged.get() == Boolean.TRUE) {
             return Collections.emptyList();
         }