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Tutorial 4 Welcome to linuxzoo

Essential Linux Unix Security

Tutorial 4

Permissions

Permissions.

To reset all the check buttons from a previous attempt click here

Question 1: Update demo account If you have just completed all the previous tutorials you need not use this setup button. However, if you have skipped part or all of the previous tutorial questions, or when you ran your virtual machine the demo account was missing, then the button below will create the demo account and create the files which the previous tutorials would have had you create.

By pressing the button below a new account is created called "demo", password is also "demo". Log in using this account and you cannot do any damage. If you mess the account up and want to start again, just press the button again.

Once created, you can log into this account using telnet or ssh, logging into the hostname linuxzoo.net. Remember the username is demo and the password is demo. And remember, you cannot break anything using this account! The account begins with an empty directory, so dont be shocked that "ls" shows nothing...

Update account Tests: Complete Update an account called demo, password demo PASSED

Question 2: Octal Code What is the octal value for the permissions on /home/demo/bigfile?

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Enter the octal value:

Check octal Tests: Complete Octal value of /home/demo/bigfile PASSED

Question 3: Other Permissions What is the "other" permissions on /home/demo/bigfile?

Only Read

Check Other Tests: Complete Octal value of /home/demo/bigfile PASSED

Question 4: Remove read and execute Take away from the scripts directory read and execute (search) permission for yourself ONLY.

Check Tests: Complete scripts has no self read/execute FAILED

Question 5: Impact of no rx What did removing read and execute do to you ability to look into scripts?

Could not ls the directory

Check Answer Tests: Complete Effect of no read or execute PASSED

Question 6: Add read Add in read access for yourself on the scripts directory.

Check Tests: Complete scripts has no self read/execute FAILED

Question 7: Impact of no x What did restoring read access do to you ability to look into scripts?

Could ls, but not access contents

Check Answer Tests: Complete Effect of no read PASSED

Question 8: Add execute

644

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Restore the directory scripts to read,write,execute for the owner, and read and execute for both others and group.

Check Tests: Complete restore scripts PASSED

Question 9: umask What umask setting would be required to give, when creating a directory, read/write/execute for yourself, read and execute for group, but only execute for others?

Octal value:

Check Answer Tests: Complete Octal value needed FAILED

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