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Chapter 4. Of Course, I Trust My Users!

Chapter 4. Of Course, I Trust My Users!

Users, Permissions, and Filesystems

The very first step in securing any Linux system (or any UNIX system, for that matter) is to secure the user and group accounts of that system. This includes encouraging good password selection; restricting user access to only those files, directories, and shells that are absolutely necessary; and properly managing the root account. Linux provides a variety of tools to assist you in managing your users and groups from a security perspective. This chapter will describe the fundamental elements of user and group account management, file and directory permissions, and filesystem management as it relates to user and group access. The primary purpose of this chapter is to cover the necessary basics. For a more thorough coverage of the material presented here, please read Practical UNIX and Internet Security as referenced in the section, System Security on page 80.


  

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