Sams.Covert.Java.Techniques.for.Decompiling.Patching.and.Reverse.Engineering

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Covert Java: Techniques for Decompiling, Patching,

and Reverse Engineering

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the publisher. No patent liability is assumed with respect to the use of the

information contained herein. Although every precaution has been taken

in the preparation of this book, the publisher and author assume no

responsibility for errors or omissions. Nor is any liability assumed for

damages resulting from the use of the information contained herein.

International Standard Book Number: 0-672-32638-8

Library of Congress Catalog Card Number: 2003116632

Printed in the United States of America

First Printing: May 2004

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00 0672326388 FM 4/9/04 2:37 PM Page ii

Contents at a Glance

Introduction .................................................................................................1

1 Getting Started..............................................................................................5

2 Decompiling Classes...................................................................................13

3 Obfuscating Classes ....................................................................................27

4 Hacking Non-Public Methods and Variables of a Class.............................43

5 Replacing and Patching Application Classes .............................................51

6 Using Effective Tracing ...............................................................................63

7 Manipulating Java Security ........................................................................69

8 Snooping the Runtime Environment.........................................................75

9 Cracking Code with Unorthodox Debuggers ............................................81

10 Using Profilers for Application Runtime Analysis .....................................89

11 Load-Testing to Find and Fix Scalability Problems..................................105

12 Reverse Engineering Applications ............................................................121

13 Eavesdropping Techniques .......................................................................127

14 Controlling Class Loading........................................................................139

15 Replacing and Patching Core Java Classes...............................................149

16 Intercepting Control Flow........................................................................155

17 Understanding and Tweaking Bytecode ..................................................165

18 Total Control with Native Code Patching ...............................................185

19 Protecting Commercial Applications from Hacking................................201

A Commercial Software License ..................................................................227

B Resources...................................................................................................233

C Quiz Answers ............................................................................................239

Index .........................................................................................................249

00 0672326388 FM 4/9/04 2:37 PM Page iii

Table of Contents

Introduction 1

1 Getting Started 5

Techniques Overview—When and Why to Use Each Method ..................5

Improving Productivity with File Managers ...............................................7

FAR and Total Commander ................................................................8

Java IDEs ...........................................................................................10

Sample Application Functionality and Structure .....................................11

Quick Quiz .................................................................................................12

In Brief .......................................................................................................12

2 Decompiling Classes 13

Determining When to Decompile ............................................................13

Knowing the Best Decompilers .................................................................14

Decompiling a Class ..................................................................................16

What Makes Decompiling Possible? .........................................................22

Potential Problems with Decompiled Code ..............................................23

Quick Quiz .................................................................................................25

In Brief .......................................................................................................25

3 Obfuscating Classes 27

Protecting the Ideas Behind Your Code ....................................................27

Obfuscation As a Protection of Intellectual Property ...............................28

Transformations Performed by Obfuscators .............................................29

Stripping Out Debug Information ...................................................29

Name Mangling ................................................................................29

Encoding Java Strings .......................................................................30

Changing Control Flow ...................................................................31

Inserting Corrupt Code ....................................................................32

Eliminating Unused Code (Shrinking) ............................................33

Optimizing Bytecode ........................................................................33

Knowing the Best Obfuscators ..................................................................33

Potential Problems and Common Solutions ............................................34

Dynamic Class Loading ...................................................................34

Reflection ..........................................................................................35

00 0672326388 FM 4/9/04 2:37 PM Page iv

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