Online-Judge

Tools used

• Programming languages: Java, JavaScript, C and Linux Shell Script (bash)
• Frameworks / Libraries: Bootstrap, Jquery, Ace Editor, Ckeditor, Java Mailer(spring), Google GSON, Java Encoder OWASP, Apache Validator, Apache Commons File Upload and MySQL JDBC Connector
• Server: Tomcat 9
• Database: MySQL 5.7
• Host OS: Ubuntu 18.04 LTS
• Sandboxing: Chroot based on Ubuntu 18.04 LTS
• Compilers: GCC 7.3.0, G++ 7.3.0, JDK 11(Oracle) and Python 3
• Additional libraries: libseccomp-dev and software-properties-common

Edits required

• Edit website/src/auth/Mailer.java using your email and password after subscribing for google mail service.
• Edit website/src/link/Link.java using your database credentials.
• Replace path-to-workspace in web.xml with a suitable path such as home/username/Desktop.

Login id

• Email: [email protected]
• Password: 123456

Demo video

• Link 1 (LinkedIn - SD quality only): https://www.linkedin.com/posts/vaibhaw-samrat-76511813a_my-btech-final-year-project-an-online-judge-activity-6568790862925529088-ccIw
• Link 2 (Google Drive - can be viewed in HD quality): https://drive.google.com/file/d/1201HCjKUiBbg9pYA792fWk_rZNR2_2Yp/view?usp=sharing

Deployment

• Install JDK, Tomcat Server, MYSQL.
• Setup chroot based on Ubuntu 18.04 LTS with all the compilers and addtitional libraries installed inside it.
• Path of chroot should be "/cryptic_security/jail".
• Place the "liboj" folder at "/" without the source folders and readme files.
• Adjust the permissions of all the files in the "liboj" folder.
• Binary files in "liboj/bin" folder are setuid wrappers, so, set the permissions accordingly.
• Place the "java_policy" file(available in source folder of judge) inside the "/etc" folder of chroot os.
• Import the database using the "database.sql" file in database folder.
• Deploy the website on Tomcat Server.

Bugs

Some of the known bugs are:

• JQuery AJAX and prepend functions fail on Google Chrome but works on Firefox, Edge and other popular browsers.
• Judge fails for first few program run initially when server is started but starts working smoothly after 2 failed attempts.