Assignment: Linux File Permissions

This assignment involved editing my CentOS Reference

Requirements

• Make users:
  • bob
  • alice
  • fred
• Make groups:
  • management
  • marketing
• Add users to groups:
  • alice -> management
  • fred -> marketing
  • bob -> marketing
• Make directories
  • /marketing
  • /management
• Ensure that only management can access /management
• Ensure that only management can view/edit /management/bobreview.txt
• Ensure that fred can edit /marketing/newproducts.txt, and bob can view it.

Making users

Fundamentally, adding users is just useradd <name>, but I'm lazy, so I did:

for u in bob alice fred; do
    useradd $u
done

Making groups

Like before, the fundamental command is groupadd <name>, but I'm ✨special✨ so I did:

for g in management marketing; do
    groupadd $d
done

Adding users to their groups

To add a user to a group you can usermod -aG <group> <user> So, for this lab:

usermod -aG management alice
for u in bob fred; do
    usermod -aG marketing $u
done

Making directories

This part is simple.

mkdir /marketing
mkdir /management
# i guess there is a limit to when I'll use a one-line for loop

Permissions for Management directory

I made the sample review file /management/bobreview.txt per lab instructions, then:

chown alice:management /management/bobreview.txt
chmod -R 770 /management

This sets the directory (and items under it) as read+write+execute for alice (as the owner), and members of management (as the owning group), and no perms for others. (Permission ints make my head hurt, you can always use a calculator like this one, or use the symbolic modes reference)

Permissions for Marketing directory

Marketing was fairly simple, as the lab is ok with alice and other users having view permissions of the dir My solution was (after doing touch /marketing/newproducts.txt as root):

chown fred:marketing /marketing/newproducts.txt

The file already had owner+group rw, so it remained after ownership transfered.

Deliverable 1