Delete services/sheesh directory

services/sheesh/Dockerfile

@@ -1,32 +0,0 @@
-FROM python:3.12-slim
-
-ARG PASSWORD=root
-ENV DEBIAN_FRONTEND=noninteractive
-ENV HOME=/home/ctf
-WORKDIR /home/ctf/chall
-
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    openssh-server \
-    build-essential \
-    libffi-dev \
-    libssl-dev \
-    python3-dev \
-    bash \
-    && rm -rf /var/lib/apt/lists/*
-
-RUN useradd -m -d /home/ctf -s /bin/bash ctf && \
-    echo "ctf:${PASSWORD}" | chpasswd
-
-RUN mkdir -p /var/run/sshd
-
-COPY requirements.txt /tmp/requirements.txt
-RUN pip install --no-cache-dir -r /tmp/requirements.txt
-
-COPY ./src /home/ctf/chall/src
-COPY ./start.sh /start.sh
-RUN chmod +x /start.sh /home/ctf/chall/src/run.sh
-
-RUN chown -R root:root /home/ctf/chall && chmod -R 555 /home/ctf/chall
-
-EXPOSE 8000 22
-CMD ["/start.sh"]

services/sheesh/chall.py

@@ -1,101 +0,0 @@
-#!/usr/bin/env python3
-
-import os
-import binascii
-import hashlib
-from Crypto.Cipher import AES
-from Crypto.Util.Padding import pad, unpad
-
-seed_bits = 23              
-seed_max  = 1 << seed_bits
-seed_len  = (seed_bits + 7) // 8   
-key = os.urandom(16)   
-
-def hash(seed_int: int) -> bytes:
-    sb = seed_int.to_bytes(seed_len, "big")
-    return hashlib.sha256(sb).digest()[:16]
-
-seed = int.from_bytes(os.urandom(4), "big") % seed_max
-seed2 = int.from_bytes(os.urandom(4), "big") % seed_max
-K1 = hash(seed)
-K2 = hash(seed2)
-
-with open("/flag.txt","rb") as f:
-    FLAG = f.read()
-
-def read(prompt: str):
-    s = input(prompt).strip()
-    try:
-        return binascii.unhexlify(s)
-    except Exception:
-        print("hmm")
-        return None
-
-def enc_cfb(pt: bytes) -> bytes:
-    iv = os.urandom(16)
-    aes = AES.new(key, AES.MODE_CFB, iv=iv, segment_size=128)
-    pt2 = pt + FLAG[:len(FLAG)//2]
-    ct = aes.encrypt(pt2)
-    return iv + ct
-
-def enc_cbc(data: bytes, iv1: bytes, iv2: bytes, padd: bool) -> bytes:
-    x  = pad(data, 16) if padd else data
-    c1 = AES.new(K1, AES.MODE_CBC, iv=iv1).encrypt(x)     
-    c2 = AES.new(K2, AES.MODE_CBC, iv=iv2).encrypt(c1)     
-    return c2
-
-def menu():
-    print("""
-1. encrypt 
-2. profit 
-3. get third 
-4. exit
-    """)
-
-third = 0
-while True:
-    menu()
-    op = input("> ").strip()
-
-    if op == "1":
-        data = read("pt: ")
-        if data is None:
-            print()
-            continue
-        out = enc_cfb(data)
-        print("ct: ", out.hex())
-        print()
-
-    elif op == "2":
-        iv1 = os.urandom(16)
-        iv2 = os.urandom(16)
-        ct  = enc_cbc(FLAG, iv1, iv2, padd=True)
-        print("iv1: ", iv1.hex())
-        print("iv2: ", iv2.hex())
-        print("ct: ", ct.hex())
-        print()
-
-    elif op == "3":
-        if third:
-            print("sheesh")
-            continue
-        block = read("pt: ")
-        if block is None:
-            print()
-            continue
-        if len(block) != 16:
-            print("hmmm\n")
-            continue
-        iv1 = os.urandom(16)
-        iv2 = os.urandom(16)
-        ct  = enc_cbc(block, iv1, iv2, padd=0)  
-        print("iv1: ", iv1.hex())
-        print("iv2: ", iv2.hex())
-        print("ct: ", ct.hex())
-        third = 1
-        print()
-
-    elif op == "4":
-        break
-    else:
-        print("mabokkkk?")

services/sheesh/dist/chall.py

@@ -1,101 +0,0 @@
-#!/usr/bin/env python3
-
-import os
-import binascii
-import hashlib
-from Crypto.Cipher import AES
-from Crypto.Util.Padding import pad, unpad
-
-seed_bits = 23              
-seed_max  = 1 << seed_bits
-seed_len  = (seed_bits + 7) // 8   
-key = os.urandom(16)   
-
-def hash(seed_int: int) -> bytes:
-    sb = seed_int.to_bytes(seed_len, "big")
-    return hashlib.sha256(sb).digest()[:16]
-
-seed = int.from_bytes(os.urandom(4), "big") % seed_max
-seed2 = int.from_bytes(os.urandom(4), "big") % seed_max
-K1 = hash(seed)
-K2 = hash(seed2)
-
-with open("/flag.txt","rb") as f:
-    FLAG = f.read()
-
-def read(prompt: str):
-    s = input(prompt).strip()
-    try:
-        return binascii.unhexlify(s)
-    except Exception:
-        print("hmm")
-        return None
-
-def enc_cfb(pt: bytes) -> bytes:
-    iv = os.urandom(16)
-    aes = AES.new(key, AES.MODE_CFB, iv=iv, segment_size=128)
-    pt2 = pt + FLAG[:len(FLAG)//2]
-    ct = aes.encrypt(pt2)
-    return iv + ct
-
-def enc_cbc(data: bytes, iv1: bytes, iv2: bytes, padd: bool) -> bytes:
-    x  = pad(data, 16) if padd else data
-    c1 = AES.new(K1, AES.MODE_CBC, iv=iv1).encrypt(x)     
-    c2 = AES.new(K2, AES.MODE_CBC, iv=iv2).encrypt(c1)     
-    return c2
-
-def menu():
-    print("""
-1. encrypt 
-2. profit 
-3. get third 
-4. exit
-    """)
-
-third = 0
-while True:
-    menu()
-    op = input("> ").strip()
-
-    if op == "1":
-        data = read("pt: ")
-        if data is None:
-            print()
-            continue
-        out = enc_cfb(data)
-        print("ct: ", out.hex())
-        print()
-
-    elif op == "2":
-        iv1 = os.urandom(16)
-        iv2 = os.urandom(16)
-        ct  = enc_cbc(FLAG, iv1, iv2, padd=True)
-        print("iv1: ", iv1.hex())
-        print("iv2: ", iv2.hex())
-        print("ct: ", ct.hex())
-        print()
-
-    elif op == "3":
-        if third:
-            print("sheesh")
-            continue
-        block = read("pt: ")
-        if block is None:
-            print()
-            continue
-        if len(block) != 16:
-            print("hmmm\n")
-            continue
-        iv1 = os.urandom(16)
-        iv2 = os.urandom(16)
-        ct  = enc_cbc(block, iv1, iv2, padd=0)  
-        print("iv1: ", iv1.hex())
-        print("iv2: ", iv2.hex())
-        print("ct: ", ct.hex())
-        third = 1
-        print()
-
-    elif op == "4":
-        break
-    else:
-        print("mabokkkk?")

services/sheesh/docker-compose.yml

@@ -1,16 +0,0 @@
-version: "3.8"
-
-services:
-  sheesh:
-    container_name: sheesh_container
-    hostname: sheesh
-    restart: always
-    build:
-      context: .
-      args:
-          - PASSWORD=root
-    ports:
-      - "12000:8000"
-      - "12022:22"
-    environment:
-      - FLAG=GEMASTIK{local_flag}

services/sheesh/requirements.txt

@@ -1 +0,0 @@
-pycryptodome

services/sheesh/run.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-exec socat tcp-l:8000,reuseaddr,fork exec:"python3 ./chall.py"

services/sheesh/start.sh

@@ -1,24 +0,0 @@
-#!/bin/bash
-set -e
-
-ssh-keygen -A
-
-grep -q "^PermitRootLogin" /etc/ssh/sshd_config && \
-  sed -i "s/^PermitRootLogin.*/PermitRootLogin no/" /etc/ssh/sshd_config || \
-  echo "PermitRootLogin no" >> /etc/ssh/sshd_config
-
-grep -q "^PasswordAuthentication" /etc/ssh/sshd_config && \
-  sed -i "s/^PasswordAuthentication.*/PasswordAuthentication yes/" /etc/ssh/sshd_config || \
-  echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config
-
-echo "AllowUsers ctf" >> /etc/ssh/sshd_config
-
-/usr/sbin/sshd
-
-if [ -n "$FLAG" ]; then
-    echo "$FLAG" > /flag.txt
-    chmod 644 /flag.txt
-    chown root:root /flag.txt
-fi
-
-exec su -c "cd /home/ctf/chall/src && ./run.sh" -s /bin/bash ctf