fix deployment stuff

physics-test/Dockerfile

@@ -1,12 +1,12 @@
-FROM ubuntu:latest as build
+FROM --platform=linux/amd64 ubuntu:20.04 AS build
 
 RUN apt-get update -y && apt-get install -y gcc && apt-get install -y wget && apt-get install -y unzip && rm -rf /var/lib/apt/lists/*
 
 RUN wget -O ynetd.c https://raw.githubusercontent.com/johnsonjh/ynetd/master/ynetd.c \
   && gcc -o ynetd ynetd.c
 
 
-FROM --platform=linux/amd64 python:3.8-slim-buster AS deployer
+FROM --platform=linux/amd64 python:3.12-slim-bookworm AS deployer
 
 RUN useradd -m -d /home/ctf -u 12345 ctf
 WORKDIR /home/ctf
@@ -17,10 +17,11 @@ RUN chmod +x ynetd
 
 # copy over source and set permissions
 COPY physics-test.py physics-test.py 
-RUN chown -R root:root /home/ctf
+COPY flag.txt .
 
+RUN chown -R root:root /home/ctf
 
 # run and expose
 USER ctf
-EXPOSE 9999
+EXPOSE 8148
 CMD ["./ynetd", "-p", "8148", "python3 physics-test.py 2>&1"]

physics-test/chall.yaml

@@ -3,9 +3,9 @@ categories:
   - misc
 value: 100
 flag:
-   file: ./flag.txt 
+    file: ./flag.txt 
 description: |-
-  Help me get an A in Physics! My teacher made this review program for us.
+    Help me get an A in Physics! My teacher made this review program for us.
 hints:
   - How is the program checking your answer? After all, it's possible to write a correct answer in multiple ways (e.g. x+y vs y+x vs 0+x+y, etc).
   - What information/feedback do you get from each question? How can you use it to your advantage?
@@ -15,5 +15,4 @@ visible: true
 deploy:
   nc:
     build: .
-    expose: 8148/tcp
-# NOTE: When deployed, check that error messages are visible (you can see that "flag" is in the error message)
+    expose: 8148/tcp

physics-test/solve.py

@@ -1,8 +1,9 @@
 from pwn import *
 
 # running on local machine
-# replace this with remote() when deployed
-p = process(['python3', 'physics-test.py'])
+# replace this with remote url
+# p = process(['python3', 'physics-test.py'])
+p = remote('localhost', 8148)
 
 # answers for each of the problems
 answers = [