LiveCTF 2022

Repository for storing challenges, infrastructure notes, streaming configuration and other version controlled bits of information for the DEF CON CTF final LiveCTF event.

Challenges used in LiveCTF

#	Challenge Name	Competitors	Victor
Round of 16: 1	syscall-me-maybe	Shellphish vs PTB_WTL	Shellphish
Round of 16: 2	open-to-interpretation	StarBugs vs ./V /home/r/.bin/tw	StarBugs
Round of 16: 3	nopcoding	OSUSEC vs Maple Mallard Magistrates	Maple Mallard Magistrates
Round of 16: 4	nerd-sniped	the new organizers vs [email protected]	the new organizers
Round of 16: 5	fairy-nuff	DiceGuesser vs Sauercloud	Sauercloud
Round of 16: 6	seek-and-destroy	侍‎ vs perfect r✪✪✪t	perfect r✪✪✪t
Round of 16: 7	nvulns	r3kapig vs Water Paddler	r3kapig
Round of 16: 8	quick-cast	Katzebin vs Straw Hat	Straw Hat
Quarter-Finals: 1	story-time	StarBugs vs the new organizers	StarBugs
Quarter-Finals: 2	stacks	Shellphish vs Maple Mallard Magistrates	Maple Mallard Magistrates
Quarter-Finals: 3	pacman	r3kapig vs Sauercloud	[Went to sudden death]
Quarter-Finals: 3.5	over-easy	r3kapig vs Sauercloud	r3kapig
Quarter-Finals: 4	no-roplem	Straw Hat vs perfect r✪✪✪t	perfect r✪✪✪t
Semi-Finals: 1	aes-of-spades	Maple Mallard Magistrates vs StarBugs	StarBugs
Semi-Finals: 2	loopy-brain	r3kapig vs perfect r✪✪✪t	[Went to sudden death]
Semi-Finals: 2.5	fast-updater	r3kapig vs perfect r✪✪✪t	perfect r✪✪✪t
Finals	f-in-the-stack	StarBugs vs perfect r✪✪✪t	StarBugs

Challenge structure

├── <challenge>
│   ├── challenge
│   │   ├── build.sh           # Commands for building challenge binary/binaries and handout
│   │   ├── config.toml        # Config file for flag submitter
│   │   ├── Dockerfile         # Dockerfile for building challenge image
│   │   ├── run.sh             # Command(s) to start the challenge
│   │   └── src                # This is where the source for the challenge will go
│   │       └── challenge.c
│   └── solution
│       ├── requirements.txt   # Solution script requirements
│       └── solve.py           # Challenge solve script

Building challenges

1. ./livectf.py build <challenge>

Managing challenges

Challenge management (creation/building/starting/stopping) is done through livectf.py, which is a light wrapper around docker. See ./livectf.py --help for usage.

Adding a challenge

1. ./livectf.py create <challenge> will copy the template challenge to a new challenge directory.
2. Add your challenge source in <challenge>/challenge/src
3. Update the solution script in <challenge>/solution/solve.py

(For challenges that include more than one source file + one binary):

4. If needed, edit REQUIRED_PACKAGES in <challenge>/challenge/Dockerfile to include any extra build/runtime dependencies
5. If needed, change the build commands in <challenge>/challenge/build.sh
6. If needed, change HANDOUT_FILES in <challenge>/challenge/build.sh

Adding a solution for a challenge

1. Add any pip requirements to <challenge>/solution/requirements.txt
2. Put your solution script in <challenge>/solution/solve.py