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Selinux: NSA's Open Source Security Enhanced Linux, by Bill McCarty
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The intensive search for a more secure operating system has often left everyday, production computers far behind their experimental, research cousins. Now SELinux (Security Enhanced Linux) dramatically changes this. This best-known and most respected security-related extension to Linux embodies the key advances of the security field. Better yet, SELinux is available in widespread and popular distributions of the Linux operating system--including for Debian, Fedora, Gentoo, Red Hat Enterprise Linux, and SUSE--all of it free and open source.SELinux emerged from research by the National Security Agency and implements classic strong-security measures such as role-based access controls, mandatory access controls, and fine-grained transitions and privilege escalation following the principle of least privilege. It compensates for the inevitable buffer overflows and other weaknesses in applications by isolating them and preventing flaws in one application from spreading to others. The scenarios that cause the most cyber-damage these days--when someone gets a toe-hold on a computer through a vulnerability in a local networked application, such as a Web server, and parlays that toe-hold into pervasive control over the computer system--are prevented on a properly administered SELinux system.The key, of course, lies in the words "properly administered." A system administrator for SELinux needs a wide range of knowledge, such as the principles behind the system, how to assign different privileges to different groups of users, how to change policies to accommodate new software, and how to log and track what is going on. And this is where SELinux is invaluable. Author Bill McCarty, a security consultant who has briefed numerous government agencies, incorporates his intensive research into SELinux into this small but information-packed book. Topics include:
- A readable and concrete explanation of SELinux concepts and the SELinux security model
- Installation instructions for numerous distributions
- Basic system and user administration
- A detailed dissection of the SELinux policy language
- Examples and guidelines for altering and adding policies
- Sales Rank: #981525 in Books
- Published on: 2004-10-21
- Original language: English
- Number of items: 1
- Dimensions: 9.19" h x .68" w x 7.00" l, .95 pounds
- Binding: Paperback
- 258 pages
About the Author
Bill McCarty is a Professor of Information Technology at Azusa Pacific University, Azusa, California. Bill is also the author of over fifteen technical books and numerous papers and presentations. He serves as editor of the Honeynet Files department of the journal IEEE Security and Privacy, and directs the Azusa Pacific University Honeynet Research Project, which is affiliated with the Honeynet Project's Honeynet Research Alliance. Bill has briefed members of US organizations such as the CIA, DISA, FBI, NASA, and NSA, and non-US organizations such as the UK's CESG and GHQ, on his honeynet research. He has worked with the FBI to prevent and detect computer crimes.
Most helpful customer reviews
3 of 4 people found the following review helpful.
Not so good
By Justin C. Klein Keane
This book is dated, so if you're looking for details on 2.6 kernel implementations you're going to be disappointed. Worse still, the book doesn't cover distributions that don't already have SELinux support. Overall I found the discussion of the theory of SELinux to be good, but implementation details were sorely lacking. Ultimately it didn't answer the questions I had (how do I install SELinux on Mandriva and configure it) so wasn't worth the price.
19 of 19 people found the following review helpful.
Good Introduction but lacks advanced, how-to information.
By J. Huckaby
Personally, I prefer books to focus either concepts or detailed implementation instructions not both. For complex topics like SELinux, you typically cannot fit the conceptual and pragmatic within one book. McCarty's SELINUX is no exception. SELINUX provides an excellent overview of concepts but struggles with policy implementation methods and procedures. I suspect the topic is simply too large for one volume. What implementation advice presented is clear and concise but you will have to search elsewhere for more detailed deployment advice.
Despite these issues, this book is recommended reading for anyone considering implementing SELinux. The conceptual overview is some of the best I've seen since SELinux got its start. Using charts, diagrams and examples, McCarty presents an excellent overview of the nuts and bolts of SELinux. Understanding the principles of Role-Based Access Control, Type Enforcement, and Security Objects is critical to both using SELinux and justifying its use. The latter may be a bigger hurdle than many anticipate. The chapters on these areas will arm you with sufficient understanding to make a clear case of why SELinux can and should be implemented in many Linux-based computing environments.
While there are brief examples throughout, the book's third chapter on SELinux installation presents a well-documented, step-by-step guide to installing SELinux. If you've never installed SELinux, these sections will prove very valuable. With clearly numbered steps and command line examples, you can have SELinux installed and configured with a default policy within an hour.
As a mix between the pragmatic and conceptual, SELINUX is a good start on this topic. Entry level SELinux users will probably not learn too much from this book, but if your are looking for a introduction to SELinux concepts along with some pragmatic advice for getting started, then this book may be for you.
7 of 7 people found the following review helpful.
Every Linux person could use this book
By S. Thomas Adelstein
Bill McCarty has done a top notch job of explaining Security Enhanced Linux as well as the security model itself. I've attempted so many time to "get it" about SELinux and not until I read this book did it make sense.
Bill's organization of the material makes a huge difference. He breaks the subject down into easily understandable chunks. The reader can follow the simple road until everything makes sense. And, SE Linux does make sense. It should be implemented everywhere.
Another thing compelled me to get this book -- it's size. This is a relatively small book. I remember thinking that I could read it without spending two weeks in a study mode. I was right about that. I read it in quick order.
I especially like O'Reilly books. I aslo like Bill's editor, Andy Oram. With the two of them collaborating, you're going to get an interesting book, topics that flow well and a professional product worth much more than the list price.
I'm glad I found this book. I want to congratulate all parties involved for creating an excellent product. I also want to say thank you for enabling me to work with Security Enhanced Linux.
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