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A data source control is a .NET Framework class that facilitates the binding of data between data stores and data-bound controls both existing controls such as the DataGrid and new data-bound controls such as GridView, TreeView, and DetailsView. Let s have a look at the plumbing that makes data source controls work as expected. A data source control represents one or more named views of data. Each view provides an enumeration of data objects (such as collections, DataSet, or business objects). The contents of the data source are managed through SQLlike statements such as SELECT, INSERT, DELETE, and UPDATE. Data source controls inherit the base class Control and come in two flavors tabular and hierarchical. The DataSourceControl abstract class serves as the base class for all data source controls and defines the interface between data-bound controls and the underlying data. Although the data source control has no visual rendering, it is implemented as a control to allow for declarative persistence (automatic instantiation during the request processing) as a native part of the .aspx source code and to gain access to the page view state. A data source control exposes the contents of its underlying data source through a set of properties and methods. Some of these members are specific to

This is the quintessential attack that everyone worries about. If an attacker has access to the password hashes, he can crack them or use them in some other way. There are several ways to crack them, as we shall see shortly. The most common way to capture the hashes is to compromise the authentication server that stores the passwords. As you will see in 13, Securing the Network, the more dependencies you have in your network, the easier this attack is to perpetrate.

Serialization is the process of writing out the state of a running software object to an output stream. These streams typically represent files or TCP data sockets.

6

Part I:

Another option less common but equally valid is to compromise a computer where someone is already logged on. When a user logs on, as I mentioned earlier, Windows caches that user s NT hash in memory. An attacker with complete control over the computer can retrieve that hash and use it in the same way as any other hash. Again, this is a problem largely related to your operational practices. As you will see in 13, if you do not expose sensitive hashes on computers that are less sensitive (and hence less secure), you will not have this problem. In addition, if a criminal manages to compromise a computer to this extent, she can easily capture the plaintext password as well, as we will see in the next section.

the control; others are common to all source controls and are defined as part of the IDataSource interface.

The JAXB development process requires the creation of a DTD and a binding schema an XML document that defines the mapping between a Java object and its XML schema. You feed the DTD and binding schema into a schema compiler to generate Java source code. The resulting classes, once compiled, handle the details of the XML-Java conversion process. This means that you do not need to explicitly perform SAX or DOM parsing in your application code. Figure 2.10 depicts the JAXB process flow. Early releases of JAXB show improved performance over SAX and DOM parsers because its classes are lightweight and precompiled. This is a positive sign for the future of JAXB, given the common concerns about performance when using XML.

Finally, the attacker can simply try to guess passwords. This is the easiest method to remedy, and also the least fruitful, or at least it should be. Anyone who has an Internet-connected Windows computer and actually looks at the log files will see attempts at this. Figure 2-13 shows a failed attempt on one of my computers on the day I was writing this chapter. Most attackers use automated password grinders that attempt to log on using either Terminal Services or Windows Networking (Server Message Block, or SMB). The log-on attempt in Figure 2-13 is actually an Internet Information Services log-on attempt, which I know only because the host does not respond on either Terminal Services or SMB across the Internet.