ICT213 Multi-user Operating Systems Administration

1. You have forgotten the root password for a system. How do you reset the root password? Give three methods: one using sudo, one booting into runlevel one and the third using a rescue disk. How do you stop any other users from using these same techniques to crack the system?
2. Try the unofficial practice L101 quiz at http://www.penguintutor.com/quiz/index.php Keep trying till you score above 70%, and then print out your results page. You can make use of the web and a runnng Linux system to try to answer the questions
3. My router keeps a log of intrusion attempts. The log contains lines like

   	
   Mar 24 01:17:30 user alert kernel: Intrusion ->  TCP packet from [ppp0] 108.162.231.167:19756 to 192.168.1.101:80
   	
         

   I would like to know which of my services are being attacked, and which hosts are most heavily involved in attacks. My external IP is 60.241.205.167 and my internal network is 192.168.1.0/24. I want to know
   1. Which IP addresses are attacking me
   2. Which ports on my hosts are being attacked
   To do this,
   1. What command will print just the lines containing the string "user alert kernel" from the log?
   2. What command will read these lines from standard input and just print the "Attack IP:port" segment?
   3. What command will remove the ":port" from these lines?
   4. What commands will sort the list of attack IP addresses and tell me the top ten addresses?
   5. For each of these ten, attempt a reverse lookup to see if their host names are accessible
   6. What command(s) will print the "My IP:port" segments from the log?
   7. What command(s) will tell me the most frequently attacked IP address and port?
4. You are setting up some Linux machines to be used as "point of sale" terminals. When someone logs in the point-of-sale application should run, occupying the whole screen with no window decorations. How do you configure the machine to do this? (For simplicity, use just an editor application as the "point-of-sale application"). Show which configuration files you have used and their contents, and attach a screen shot of the application.
5. Summarise the arguments for and against systemd in about two paragraphs.

Group size

This assignment (and the next one) must be done individually.

Due date

The assignment is due at by Friday April 10. Submit a soft copy using Student Web.