Selinux: NSA's Open Source Security Enhanced Linux

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Dec 9, 2013 (3 years and 6 months ago)

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Selinux: NSA's Open Source Security Enhanced Linux
By Bill McCarty
Selinux: NSA's Open Source Security Enhanced Linux Details:
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
With
SELinux
, a high-security computer is within reach of any system administrator. If you
want an effective means of securing your Linux system--and who doesn't?--this book
provides the means. The article explains what renewable energy is and the most common
sources of renewable energy. Renewable energy is basically energy that is created from
natural resources like sun, wind, water and earth. This renewable energy is replaceable and
therefore using the same does not deplete the reserves that exist. Will using up solar energy
reduce the heat of the sun? Or will utilizing wind to churn windmills and produce
electricity result in lesser wine? We all know the answer and therefore renewable energy is
a green option that we should take. On the other hand there are non renewable energy
sources like petroleum and coal that have limited availability and are likely to get depleted
faster than they can be created in the environment. It is estimated that about 18% of the
global energy came from renewable sources and there are efforts each day to increase this
proportion to a higher level. Some of the most common renewable energy sources are wind
energy, solar energy and hydro energy. The wind renewable energy : Windmills have been
used for centuries to pump water or create power for grinding grain. Today the same is
being used in a more technologically savvy manner and the traditional windmills are being
replaced by modern turbines. The solar renewable energy : Some ancient tribes used the
suns heat to warm various products. Many kids play the game of using a lens to focus the
suns light on a paper causing it to burn. The sun is a huge source of renewable energy and
technologies today use this energy to do practically almost anything : from heating houses
to water to provide electricity too. The hydro renewable energy : Hydro energy is one of the
most commonly used renewable energy sources. It is used extensively in all countries to
generate electricity by controlling the flow of the water by using dams. Mel writes about
Renewable energy among other environment related topics.
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