🌍 Access Control Lists (ACLs) in 🐧 Linux: Managing File Permissions

👉 Quick Intro 🔥

• Access control list (ACL) provides an additional, more flexible permission mechanism for file systems.

• Using ACL we can give file or directory permissions to particular user or group

• Think of a scenario, In a library certain rooms are for specific groups. But, if you want to give a friend access to a room without them joining the group, think of Access Control Lists (ACLs) as a special hidden key. With ACLs, you can grant access to that room without making your friend an official member of the group. It's like a secret pass that allows specific access without changing the group setup.

👉 Let's Start ✅

1. Check ACL permission ❓

   getfacl <file/dir>

   

   The permissions that you can see above are default permissions not specific to ACL permissions

2. Set ACL permission for User 👨

   setfacl -m "u:<user>:<permissions>" <file/dir>

   

   If you do ls -l after setting ACL permissions, you can see + at the end of file permissions, which represents ACL permissions that have been added to that file/dir.

   You can use -d along with -m to allow all files or directories to inherit ACL entries from the directory it is within

3. Set ACL permission for Group 👥

   setfacl -m "g:<group>:<permissions>" <file/dir>

   

   You can use -d along with -m to allow all files or directories to inherit ACL entries from the directory it is within

4. Remove specific User ACL permission 👤❎

   setfacl -x "u:<user>" <file/dir>

   

   The user:user1:-wx has been removed

5. Remove specific Group ACL permision👥❎

   setfacl -x "g:<group>" <file/dir>

   

   The group:user1:rwx has been removed

6. Remove all ACL permissions 🗑️

   setfacl -b <file/dir>

   

   Removed all ACL permissions

👉 Conclusion 👀

You just learned ACL 😅

Happy Learning!!! 👋