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The main filesystem monitoring tool available in CentOS is the RPM database. This database is maintained by the package management tool, RPM. Every file installed from an RPM package is tracked in this database. You can compare the information in the database to the actual files on the filesystem to generate a report of the differences. Some of the differences found indicate valid changes made by the system administrator, but any unexplained differences might be evidence of an intrusion. The main benefit of using RPM is that every CentOS system comes with an RPM database that is automatically kept up-to-date as you install and uninstall software you don t need to do anything to maintain the database. The RPM command includes a mode of operation that lets you verify your installed packages, which you invoke this with the -V parameter. You can verify a single package with this command: rpm V <package name> You can verify a single file with this command: rpm V -f <file name> You can also verify all installed packages with the rpm -Va command. You should expect some changes when you run a verify command, and the report provides some information to help determine if the change requires further investigation. Listing 9-10 shows some examples of the output you might receive on a typical CentOS server. Listing 9-10. Sample rpm -Va output S.5....T c /etc/yum.conf ....L... c /etc/pam.d/system-auth missing /usr/share/mimelnk/application/pdf.desktop S.5....T /usr/share/icons/hicolor/icon-theme.cache The first two lines are marked with a c, which indicates that they are configuration files. You can expect configuration files to change, so you can ignore these safely. This column can also contain other codes to indicate documentation and license files. Table 9-3 shows the possible file codes and what they mean.

'MasterChief': cannot derive from sealed type 'FireChief'

Not only can sealing classes be very useful (and defensive), but if you decide later that you want to unseal the class and allow people to derive their own types, it doesn t (normally) break binary compatibility for the type. Sealing a previously unsealed class, however, does break compatibility.

This code defines the interface called IReview with a function called CreateReview The workflow uses this interface to create an initial performance review and accepts two parameters: Reviewer and Reviewee The interface is now defined, but there s no code associated with the interface If the CreateReview function isn t automatically defined, add the following code to the class: public Boolean CreateReview(String Reviewer, String Reviewee) To do this, change the class declaration for ReviewService to the following: class ReviewService: IReview For a simple example, add the following code to the CreateReview function: MessageBoxShow("Reviewer: " + Reviewer); return true; The CreateReview function should have the following code: public Boolean CreateReview(String Reviewer, String Reviewee) { MessageBoxShow("Reviewer: " + Reviewer); return true; } Now that you ve defined the service class, you can define the workflow Add a CallExternalMethod activity to Workflow1 using the designer Change the name to CallCreateReview.

We now have three different types of firefighter. Let s remind ourselves how they are related (see Figure 4-1).

The next line of output is marked with the word missing, which indicates that the file is missing from the filesystem. Missing files can indicate an intrusion, an accidental deletion by the administrator, or a poorly packaged application. The output doesn t explain why the file is missing, but in this case a packaging conflict with a third-party PDF viewer is suspected. Typically, you can restore a missing file by reinstalling the appropriate package, as I will demonstrate later in this chapter. It might also be a sign of intrusion if system or security files are missing without an explanation. I ll also cover what this might look like and how you might recover from it later in this chapter. The last file listed is a cache file, which you can also expect to change from time to time. The verify command displays a summary of changed attributes when it detects a change in a file. A number of letters and symbols indicate the different attributes that the RPM database tracks. The first and last files listed in Listing 9-10 show the codes S, 5, and T. These codes indicate changes in the file size, the MD5 checksum, and the timestamp. These three codes are typical of a normal file change, but they can still be cause for concern. As with the other examples, I will cover how some of these changes might have more security significance than others. For example, U, G, and M signify changes to the user, group, and file permissions, all of which are significant changes. On the flipside, changes to timestamps don t typically indicate a problem. You can find the complete list of codes in Table 9-4. Table 9-4. Verify Attribute Codes

Why, you may ask, if we are nonvirtual by default aren t we also sealed by default, with an unseal keyword Notice, for instance, that we ve been talking about classes so far value types (struct) are sealed (with no opt-out), so you can t derive from them. There s no performance hit to marking a class sealed. There are potential security advantages to marking a class sealed (no one can sneakily exploit polymorphism to insert code where you weren t expecting it). So why not make them all sealed It is certainly much less problematic to present an unsealed class than it is to present a virtual method; if there are no virtual methods, all you can do is to bolt extra bits on, which do no harm to anyone. It also conforms to the expectations of a generation of C++ and Java developers in this regard. Plenty of people argue that we should have both unsealed-by-default and virtual-bydefault, and they certainly have a point, particularly with regard to convenience; but the designers of C# took a different view. No doubt, the debate will continue.