Chapter 23. Security

When you set up your Linux system, you brought up a powerful, high level, multitasking network operating system—one that was maybe a little too powerful. Depending on your installation and the choices you made, a large number of services may have started (rlogind, inetd, httpd, innd, fingerd, timed, rhsd, and others). Do you know what they all are? You should. As a system administrator, you've got enough things to worry about, such as that hung printer, but if your machine is exposed to the Internet, you should pay particular attention.

Security is a huge topic, one that could easily fill a few books. Covering it in complete detail is beyond the scope of this book. I can, however, provide you with basics that will give you ...

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