• Instructor: 蔡孟勳 Meng-Hsun Tsai
• Semester: NYCU-112-1
• Pre-requisites:
  • Basic knowledge of UNIX commands
  • Basic Programming skills
  • Basics of TCP/IP Networking
  • Your HARD STUDY
• Grading
  • Mid 15%
  • Final 15%
  • Homeworks 70%
• Credit: 3
• Contact:
  • TR: [email protected]
  • TA: [email protected]
• Reference Website:
  1. NYCU-SA-2023: https://nasa.cs.nycu.edu.tw/sa/2023/
  2. NASA-OJ: https://nasaoj.cs.nycu.edu.tw
  3. ShellCheck: https://www.shellcheck.net

Install FreeBSD / Ubuntu & WireGuard

• Basic(15%)
  • Install FreeBSD 13.2-RELEASE
  • Alternatively, Install Ubuntu 22.04
• Root on ZFS (15%)
  • Zpool name : zroot (rpool on Ubuntu)
• Add a user and a group
  • User should also be in the "wheel" group ("sudo" on Ubuntu)
  • Use this user to do this homework instead of root (using sudo)
• Add a user called "judge" for Online Judge
  • User should also be in the "wheel" ("sudo" on ubuntu) group
  • Please use "sh" as default shell (10%)
  • This user needs to run sudo without password (15%)
• Set your machine to current time zone and adjust current time (10%)
  • CST
• Enable sshd (20%)
  • Install this public key to your /home/judge/.ssh/ for Online Judge.

    $ fetch https://nasa.cs.nctu.edu.tw/sa/2023/nasakey.pub
    $ cat nasakey.pub >> /home/judge/.ssh/authorized_ke

  • You can use Fingerprint to check "nasakey.pub"

    $ ssh-keygen -l -f nasakey.pub
    256 SHA256:0LO0tdbs1Q5q4J8wa4Hidej2gkq9gqtLQeJwm98VYZk sa-2023 (ED25519)

• Install Wireguard
  • Configure the connection
  • Configuration directory: /usr/local/etc/wireguard/wg0.conf
  • Use wg-quic and wg to start/stop the connection

Shell Script