How to Configure and Implement Access 
Control Lists on a Filesystem

One area where Linux did not initially include the same level of security as some other operating systems was in ACLs, which allow you to set different permissions for specific users and groups. Linux developers started to address this flaw back in 2002, so ACL support in Linux is mature. It’s available for the standard Linux filesystems, including ext2, ext3, ext4, reiserfs, and xfs. As suggested earlier, it’s also available for directories shared through NFS. The ACLs available for Samba are somewhat different, as they are based on the functionality developed for Microsoft operating systems.

ACLs provide a second level of discretionary access control. The ACL options you ...

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