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In this chapter you learned about securing your Linux system, mitigating risk, and learning what to look for when making decisions about how to balance features/functions with the need to secure Specifically, we covered causes of risk such as SetUID programs, programs that run as root, and unnecessary programs We also covered approaches to mitigating risk through the use of chroot environments and controlling access to users We briefly discussed two popular implementations of the Mandatory Access Control (MAC) security model in Linux: SELinux and AppArmor Finally, we discussed some of the things that should be monitored as part of daily housekeeping In the end, you will find that maintaining a reasonably secure environment is largely a case of good hygiene Keep your server clean of unnecessary applications, make sure the environment for each application is minimized so as to limit exposure, and patch your software as security issues are brought to light With these basic tasks, you ll find that your servers will be quite reliable and secure On a final note, keep in mind that this section alone does not make you a security expert, much as the chapter on Linux firewalls didn t make you a firewall expert Linux is always evolving and always improving You will need to continue to make an effort to learn about the latest technologies and expand your general security knowledge

// Demonstrate the generic class class GenDemo { public static void main(String args[]) { // Create a Gen reference for Integers Gen<Integer> iOb; // Create a Gen<Integer> object and assign its // reference to iOb Notice the use of autoboxing // to encapsulate the value 88 within an Integer object iOb = new Gen<Integer>(88); // Show the type of data used by iOb iObshowType(); // Get the value in iOb Notice that // no cast is needed int v = iObgetob(); Systemoutprintln("value: " + v); Systemoutprintln(); // Create a Gen object for Strings Gen<String> strOb = new Gen<String>("Generics Test"); // Show the type of data used by strOb strObshowType(); // Get the value of strOb Again, notice // that no cast is needed String str = strObgetob(); Systemoutprintln("value: " + str); } }

Figure 5-2. Start recording a bot s movements with the RECORD/PLAY block. I know it seems like common sense, but I still need to say it: we cannot play back SPOT s recorded movements until we ve actually recorded some. So the first thing we need to do is configure the RECORD/PLAY block to record SPOT s movements. To do this, in the block s Action section, select the Record option as shown in Figure 5-3. This is the default setting when you drop a RECORD/PLAY block onto the workspace.

n 14, we made the statement: When you hear about a new attack (or vulnerability) against any operating system, it would be interesting to find out whether the vulnerability is exploitable via the network or not The answer to the question had a bearing on how the attack is approached In other words, does the attack require local access to the system, or does the attack only need network connectivity to the system The former case was covered in 14 The latter case is covered in this chapter Network security addresses the problem of attackers sending malicious network traffic to your system with the intent either to make your system unavailable (denial-ofservice attack) or to exploit weaknesses in your system to gain access or control of the system Network security is not a substitute for good local security practices discussed in the previous chapter Both local and network security approaches are necessary to keep things working the way that you expect them to In this chapter, we cover four issues in network security: tracking services, monitoring network services, handling attacks, and tools for testing These sections should be used in conjunction with the previous chapter on local security, as well as 13

The output produced by the program is shown here: Type of T is javalangInteger value: 88 Type of T is javalangString value: Generics Test Let s examine this program carefully First, notice how Gen is declared by the following line:

class Gen<T> {

This chapter assumes you have experience configuring a system for use on a Transmission Control Protocol/Internet Protocol (TCP/IP) network Because the focus here is on network security and not an introduction to networking, this section discusses only those parts of TCP/IP affecting your system s security If you re curious about TCP/IP s internal workings, read 11

Here, T is the name of a type parameter This name is used as a placeholder for the actual type that will be passed to Gen when an object is created Thus, T is used within Gen whenever the type parameter is needed Notice that T is contained within < > This syntax can be generalized Whenever a type parameter is being declared, it is specified within angle brackets Because Gen uses a type parameter, Gen is a generic class, which is also called a parameterized type

Part I: