ABOBA | CTF Attack-Defense Checksystem

System for CTF competitions in the Attack-Defense format

Architecture diagram

Component description

board-srv

• Returns the scoreboard
  • Points per service
  • Number of submitted/lost flags per service
  • Service SLAs
  • Total score
  • Service difficulties
  • Service authors
  • Current round time
• Returns attack-data

score-srv

• Calculates scores using either a custom formula or the default one
• Accepts flags from teams
• Validates flag submissions using team tokens
• Detects First Bloods and records them
• Logs flag submissions (which team, from which service, and at what time)

admin-srv

• Add/remove teams during the competition
• Pause/resume the competition
• Export competition results
• Manually adjust scores (add or remove points)

checksystem

• The game loop starts checkers on all services of all teams and awards points for each round
• Records service availability
• Generates flags and sends them to the checker
• Verifies flags previously set in services