Task A: Get accounts and groups ready (70 points)
Step 1. Create three groups- employee, payroll, and admin. (You may refer to the slides under Module
2 \u2013 Group Management)
Step 2. Create three user accounts with a specified home directory for Sophia, Olivia, and Emma. Set
the primary group for Sophia, Olivia, and Emma to “employee”, “payroll”, and “admin”, respectively.
And change their login shell to \/bin\/bash. Don’t forget to set their passwords.
Step 3. Create a shared group called “your_midas” (replace it with your MIDAS name) and set this shared
group as the above accounts’ secondary group. After this step, remember to check each user’s group
profile.
Step 4. Create a directory named \/home\/cyse_project, which is to be owned by the \u201cyour_midas\u201d group
which is a shared group). After this step, remember to check the permission of this shared directory.
Step 5. Change the permissions of the \/home\/cyse_project directory to “rwxrwx—” using the octal
method so that only the project group members have access to this directory. After this step, remember
to check the permission of this shared directory.
Step 6. Switch to Sophia’s account. Change the default permissions using octal method with umask
command, to “rw-r—–” for Sophia when she creates a file or directory. Check the value of umask, and
permission of a new file after this step.
Step 7. Create a new file called “Sophia_homework” in the home directory of Sophia and put your name
in the file as content. After this step, remember to check the content and the permission of the new file.
(ls -l Sophia_homework)<\/p>\n\n\n\n
Step 8. Copy “Sophia_homework” to the \/home\/cyse_project directory. After this step, remember to
check the permission of the file in the shared directory.
Step 9. Switch to Emma’s account. Try to read “Sophia_homework” in the \/home\/cyse_project
Directory.
Step 10. Exit out of Emma\u2019s account and Sophia\u2019s account.
Task B: Set SGID permission (15 points)
Step 1. Switch to root or the regular user\u2019s account. To allow group members to access the files shared
in the shared directory, you need to fix the sharing issue by setting the correct SGID group values to
\/home\/cyse_project directory.
Step 2. Switch to Sophia’s account. Copy “Sophia_homework” to the \/home\/cyse_project directory as
“Sophia_homework2”.
Step 3. Switch to Emma’s account. Try to read “Sophia_ homework2” in the \/home\/cyse_project
directory.
Task C: Unset SGID permissions (15 points)
Step 1. Switch to root the regular user\u2019s account. To disallow group members to access the files in the
shared folder, you need to fix the sharing issue by setting the correct SGID group values to
\/home\/cyse_project directory to remove the group user read permission.
Step 2. Switch to Sophia’s account. Copy “Sophia_homework” to the \/home\/cyse_project directory as
“Sophia_homework3”.
Step 3. Switch to Olivia’s account. Try to read “Sophia_home3” in the \/home\/cyse_project directory.<\/p>\n\n\n\n
Reflection
This assignment allowed me to practice managing user accounts, groups and permissions in Linux. I was able to create a shared group and set that up for a secondary group membership, allowing me to control shared access to resources. This assignment gave me a solid foundation in managing user and group access, which in return, will be useful for maintaining secure systems.
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