Chapter 17: Access Control Lists

Section 15.4 described the traditional Unix (and Linux) file permissions scheme. For many applications, this scheme is sufficient. However, some applications need finer control over the permissions granted to specific users and groups. To meet this requirement, many Unix systems implement an extension to the traditional Unix file permissions model known as access control lists (ACLs). ACLs allow file permissions to be specified per user or per group, for an arbitrary number of users and groups. Linux provides ACLs from kernel 2.6 onward.

This chapter provides a description of ACLs and a brief tutorial on their use. It also describes some of the library functions used for manipulating and retrieving ACLs.

17 Access Control Lists
17.1 Overview
17.2 ACL Permission-Checking Algorithm
17.3 Long and Short Text Forms for ACLs
17.4 The ACL_MASK Entry and the ACL Group Class
17.5 The getfacl and setfacl Commands
17.6 Default ACLs and File Creation
17.7 ACL Implementation Limits
17.8 The ACL API
17.9 Summary
17.10 Exercises

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