Mastering Linux Security and Hardening

Hands-on lab – setting security-related extended file attributes

For this lab, you'll create a perm_demo.txt file with the text of your own choosing. You'll set the i and a attributes, and view the results:

1. Using your preferred text editor, create the perm_demo.txt file with a line of text.
2. View the extended attributes of the file:

        lsattr perm_demo.txt

3. Add the a attribute:

        sudo chattr +a perm_demo.txt        lsattr perm_demo.txt

4. Try to overwrite and delete the file:

        echo "I want to overwrite this file." > perm_demo.txt        sudo echo "I want to overwrite this file." > perm_demo.txt        rm perm_demo.txt        sudo rm perm_demo.txt

5. Now, append something to the file:

        echo "I want to append this line to the end of the file." >>         perm_demo.txt

6. Remove the ...