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Security
Linux, like any computer system, has a set of
security issues that need to be considered. Regardless of what mechanisms are in
place, the basic concepts are the same. In fact, the security
of a computer
system is very much like the security
of your house, just as running a computer
system is like running a household. You only want to let those people in that
should be let in and you only want people accessing resources that they should.
(Do you really want your 3-year-old playing with your collection of
Dresden Porcellan?)
The term security is common enough. On a
personal basis we think of it as freedom from risk or danger; being safe. We
might also think of this as the methods we undertake to prevent someone from
breaking into our house. In computer science terms, both of these ideas are
applicable, depending on what you are referring to.
If we talk about being
safe from risk when working with computers, we are often talking about things
like regular backups and reliable hardware. Although these are very important
issues, these are not what is generally meant when referring to security.
On
computers systems, security
is more along the lines of preventing someone from
breaking in. The definition can be expanded by saying computer security
is
preventing someone from doing something that they are not allowed to do. This
could be anything from reading other peoples mail to stopping the
printers.
In this section we're are going to be talking about what
mechanisms exist to keep people from poking around and doing things they
shouldn't. Well talk about what tools Linux provides to control access, change
what users can access and how to make sure users are not even trying to do
things they shouldn't.
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Copyright 2002-2009 by James Mohr. Licensed under modified GNU Free Documentation License (Portions of this material originally published by Prentice Hall, Pearson Education, Inc). See here for details. All rights reserved.
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