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To add or remove support for optional JSRs in NetBeans, do the following:
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1 Open the project s properties by right-clicking on the project and selecting
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Properties
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2 Select the Platform category from the right-side tree menu This property page
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lets you tweak individual settings on the device
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3 Disable or enable individual JSRs by finding their API set and clicking the
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check box Unfortunately, the actual JSR number is not provided in this list
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The MIDP security specification groups access to a device into permission domains By default, applications written in NetBeans will run in the Maximum permission domain, which should never happen in the real world and won t exhibit close to the same security behavior as it will on an actual device To actually test the security of your application, force the application to run in a restricted permission domain This way, you can see how the application will respond on a real device Of course, individual devices may behave differently, and any real testing should be performed with the appropriate target toolkit and certificates To cause an application to run in a particular permission domain when being deployed from NetBeans, do the following:
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1 Open the project s properties by right-clicking on the project and selecting
Properties
2 Select the Running category from the right-side tree menu 3 Check the Specify the Security Domain check box and select a permission
domain For this exercise, choose Minimum
Mobile Application Security
4 Run the Demos project Notice that the application won t actually start This is
because the project uses the HTTP and HTTPS library and is not being signed by NetBeans, which causes the device to block the application from running
Reverse Engineering and Debugging
Reverse engineering is a critical skill for almost every penetration tester and security engineer Through reverse engineering, you can look at the hidden secrets of the platform and applications to find out how they really work and where the security flaws are The goal is not to understand every instruction, but rather to understand what data the application is consuming and producing After all, almost all security vulnerabilities result from errors when producing and consuming data Just as we benefit from being able to use the same development toolchain for JME, we benefit by being able to use the same debugging and reverse-engineering toolchain Because JME code is Java, almost all of the standard Java security tools work, and there are even a couple of JME-specific tools that make reverse engineering and debugging easier
Disassembly and Decompilation
Java application classes are compiled into Java class files These files contain Java bytecode, which is a machine-independent set of instructions for the Java virtual machine to execute Machine-independent bytecode is what allows Java to run everywhere from ATMs to vending machines When developers want to run Java on a new hardware platform or operating system, they create a new version of the Java virtual machine for that platform If this virtual machine properly conforms to the Java specification, it will be able to execute Java bytecode without problems For security reasons, Java mandates that bytecode be easily inspected at runtime To support this, Java application bytecode must follow some conventions Disassembling x86 assembly code is a very painful process Java instructions (aka opcodes) are each one byte in size Depending on the opcode, there may or may not be instruction operands Whether or not operands exist doesn t matter Every instruction will always be a predictable size This quality is very important during runtime code inspection because it allows the virtual machine to easily traverse the application in a predictable manner Additionally, instructions are not allowed to jump to invalid memory locations, use uninitialized data, or access private methods and data (see http://enwikipediaorg/wiki/Java_virtual_machine) Contrast this to x86 programs, where these methods are often used to hide an application s true behavior
6: Java Mobile Edition Security
Just like the runtime does, reverse engineers can take advantage of the consistent size and variable rules to convert the program from its compiled form back into instructions a process known as disassembly Java is easy to disassemble that is, it can be decompiled and turned back into Java source code The results aren t always pretty, but it is much easier to read messy Java source code than to read Java virtual machine opcodes
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