Mastering Linux Security and Hardening

Access Control Lists and Shared Directory Management

In the previous chapter, we reviewed the basics of Discretionary Access Control. In this chapter, we'll take our discussion of DAC a step further. We'll look at some more advanced techniques that you can use to make DAC do exactly what you want it to do.

Topics in this chapter include:

• Creating an access control list (ACL) for either a user or a group
• Creating an inherited ACL for a directory
• Removing a specific permission by using an ACL mask
• Using the tar --acls option to prevent loss of ACLs during a backup
• Creating a user group and adding members to it
• Creating a shared directory for a group, and setting the proper permissions on it
• Setting the SGID bit and the sticky bit on the shared ...