Mastering Linux Security and Hardening

Setting the permissions and creating the ACL

First, Vicky sets the normal permissions to allow only her to access her file. Then, she'll set the ACL:

[vicky@localhost marketing]$ echo "This file is only for my good friend, Cleopatra." > vicky_file.txt[vicky@localhost marketing]$ chmod 600 vicky_file.txt[vicky@localhost marketing]$ setfacl -m u:cleopatra:r vicky_file.txt[vicky@localhost marketing]$ ls -ltotal 4-rw-rw-r--. 1 charlie marketing 0 Nov 13 15:59 charlie_file.txt-rw-r-----+ 1 vicky marketing 49 Nov 13 16:24 vicky_file.txt[vicky@localhost marketing]$ getfacl vicky_file.txt# file: vicky_file.txt# owner: vicky# group: marketinguser::rw-user:cleopatra:r--group::---mask::r--other::---[vicky@localhost marketing]$

There's nothing here that ...