Access control lists allow for more fine-grained access controls on files. Instead of using a common group ownership, access to files can be individually granted to users or groups.
However, the access controls that SELinux enables should also be tailored to this situation. Features such as the user-based access control constraints in SELinux might prevent sharing user content altogether, regardless of the ACLs set on the file.
Assuming that a user wants to allow read and read-write accesses to a set of files and directories, the following set of steps can be used:
~# mkdir -p /home/share/ ~# chmod 1777 /home/share/