My Connection Guide for CMU 14-741/18-631: Introduction to Information Security

README.md

My Connection Guide for 14-741/18-631

Settings

$ cat ~/.ssh/config
Host *
    TCPKeepAlive yes
    ServerAliveInterval 60
    ServerAliveCountMax 2
    ControlMaster auto
    ControlPath ~/.ssh/master_%r@%h:%p

Host 14741
    Hostname 14741hw.ini.cmu.edu
    User tunneler
    DynamicForward 8123
    Compression yes
    LogLevel QUIET
    RequestTTY no

Host 741
    Hostname 192.168.2.73
    User your_username
    #ProxyCommand /usr/bin/nc -x 127.0.0.1:8123 %h %p
    ProxyJump 14741

Usage

# In a terminal
$ #ssh -D 8123 -C -q -N tunneler@14741hw.ini.cmu.edu
$ ssh 14741

SSH tunnel started, shell disabled by the system administrator
TERM environment variable not set.

# In a new terminal
# For macOS user: DO use the /usr/bin/nc
$ #ssh -o ProxyCommand='/usr/bin/nc -x localhost:8123 %h %p' your_username@192.168.2.73
$ ssh 741

Warning: Permanently added '192.168.2.73' (ECDSA) to the list of known hosts.
Enter your platform password (characters will be hidden):
your_username@pico-local-dev-shell:~$ 

Developing Environment Setup with Docker

The following is about a containerized developing environment for 14-741/18-631, based on Docker and Ubuntu.

$ git clone https://gist.github.com/fd0a103929ecc867043654dafce410ac.git cmu-14741 && cd cmu-14741
$ docker-compose run --rm ctf
# can also run with Docker
$ docker run --rm -v "`pwd`":/app/ -it lx70716/cmu-14741

docker-compose.yml

version: "3"

services:
  ctf:
    build: .
    image: lx70716/cmu-14741:latest
    container_name: cmu-14741
    volumes:
      - ./:/app/
      - ./.bash_history:/root/.bash_history
      - ~/.gdbinit:/root/.gdbinit
    restart: "no"
    stdin_open: true  # --interactive Keep STDIN open even if not attached (docker exec -i)
    tty: true         # --tty Allocate a pseudo-TTY (docker exec -t)
    security_opt:
      - seccomp:unconfined
    cap_add:
      - SYS_PTRACE

Dockerfile

FROM i386/ubuntu:18.04

WORKDIR /app

RUN apt-get update \
  && apt-get install -y \
    build-essential \
    binutils \
    gdb \
    gcc-multilib \
    valgrind \
    python \
    vim \
  && rm -rf /var/lib/apt/lists/*