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But although we would love to say that security holes are not found on Linux, the sad truth is that they re a fact of life for users of every OS. Many so-called rootkits specialized software toolkits that aim to exploit holes within the Linux OS and its software are available. The bottom line is that although writing a virus or worm for Linux is much harder than doing the same thing on Windows, all Linux users should spend time securing their system and never assume that they re safe.

Although users are the subject of another chapter, allow us to introduce the distinction between the root user account and ordinary users, because this distinction is the foundation on which much of the security model is based. For a more in-depth discussion on the matter, refer to 21. Linux makes

System.Data System.Data.Common System.Data.Design System.Data.Odbc System.Data.OleDb System.Data.Sql System.Data.OracleClient System.Data.SqlClient System.Data.SqlServerCe System.Data.SqlTypes Microsoft.SqlServer.Server

LINQ to XML provides easy ways for adding, removing, and changing the content of an XML tree. These ways can be best seen with an example. Let s create an application like the one shown in Figure 13-8 that represents a data entry screen for the Employees.xml file.

use of something called the root user account This is sometimes referred to as the superuser account, and that gives you an idea of its purpose in life: the root user has unrestricted access to all aspects of the system The root user can delete, modify, or view any file, as well as alter hardware settings Because everything on a Linux system is a file, this gives the root user immense power Linux systems also have ordinary user accounts, which are limited in what they can do Such users are limited to saving files in their own directory within the /home directory (although the system is usually configured so that an ordinary user can read files outside the /home directory too) But an ordinary Ubuntu user cannot delete or modify files outside of their /home directory unless explicitly given this permission by the root user.

The user account you created during the installation of Ubuntu is a limited account, but on some Linux systems, it s possible to type root at the login prompt and, after providing the correct password, actually log in as root and perform system maintenance tasks Ubuntu is slightly different in that the root account is disabled by default, and users are instead able to borrow superuser powers whenever they re required, in a similar way to Mac OS X For this to happen, they simply need to provide their own login password With desktop programs, a password prompt dialog box appears automatically Although the root account is disabled, most key operating system files belong to the root user, which is to say that only someone with superuser powers can alter them Ordinary users are simply unable to modify or delete these system files.

Figure 13-8. Data entry screen for the Employees.xml file The application displays <employee> elements from the Employees.xml file. You can navigate among various employees using the VCR controls provided at the bottom. You can also jump to an employee with a specific employee ID using the combo box. The Add, Update, and Delete buttons add, change, or remove an <employee> element from the underlying XML tree, respectively. The Save button saves the modified XML tree back to the Employees.xml file.

Classes, interfaces, delegates, and enumerations that define and partially implement the ADO.NET architecture Classes shared by .NET Framework data providers Classes that can be used to generate a custom-typed dataset The .NET Framework data provider for ODBC The .NET Framework data provider for OLE DB Classes that support SQL Server specific functionality The .NET Framework data provider for Oracle The .NET Framework data provider for SQL Server The .NET Compact Framework data provider for SQL Server Mobile Classes for native SQL Server data types Components for integrating SQL Server and the CLR

This is a powerful method of protecting the OS configuration from accidental or even deliberate damage..

Note Along with the root and ordinary user accounts, there is a third type of Linux account, which is similar to a