Task-2 Arora_Suvan

Dockerfile

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+# Stage 1: compile
+FROM gcc:11 AS builder
+WORKDIR /app
+COPY final.cpp .
+RUN g++ -std=c++17 -O2 final.cpp -o ott_app
+
+# Stage 2: runtime
+FROM debian:bookworm-slim
+RUN useradd --create-home appuser
+USER appuser
+WORKDIR /home/appuser/app
+COPY --from=builder /app/ott_app .
+RUN touch user.txt
+ENTRYPOINT ["./ott_app"]

otw.md

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+# OverTheWire Bandit Wargame Levels 0–15
+
+## General  
+**Enter a level using the command:**  
+`ssh bandit12@bandit.labs.overthewire.org -p 2220` (here level12)
+
+---
+
+## Level 0  
+**Given password is bandit0 then use cat to read the file readme**
+
+---
+
+## Level 1  
+**Use ls - list of files and cat - displays the content of the file. Special syntax**  
+`cat ./-` **for opening this file**
+
+---
+
+## Level 2  
+**Use** `cat./””` **syntax for opening file with big names**
+
+---
+
+## Level 3  
+1. **Use** `cd` **to change directory to inhere**  
+2. **Use** `ls -a` **as it shows all files including hidden and then use** `cat`
+
+---
+
+## Level 4  
+**Use** `file ./0*` **to get information about files and then open the file with ascii text**
+
+---
+
+## Level 5  
+**Use** `find ./ -size 1033c 2>dev/null/` **to get the required file (2>/dev/null - dumps the waste files)**
+
+---
+
+## Level 6  
+**Use** `find ./ -user bandit6 -user group 2>/dev/null`
+
+---
+
+## Level 7  
+**Use** `cat data.txt | grep”millitonth”`  
+**grep finds the next work to millionth and** `|` **is referred to as piping which is needed to execute multiple sequentially**
+
+---
+
+## Level 8  
+**Use** `cat data.txt | sort | uniq -u`  
+**first we need to sort because uniq can only detect adjacent duplicates and then it prints the line which is not repeated even once**
+
+---
+
+## Level 9  
+**Use** `strings data.txt | grep”==”`  
+**it prints all strings which are present in the txt file after two = signs. Since multiple = were mentioned we could use 2 = signs.**
+
+---
+
+## Level 10  
+**Use** `cat data.txt | base64 -d` **as it decodes the base 64 data**
+
+---
+
+## Level 11  
+**Use** `tr` **to decrypt the rotated positions of the alphabets. Here the data is encrypted using ROT13**
+
+---
+
+## Level 12  
+**Use** `mkdir` **to create a temporary directory then change path of the file, decompress using** `xxd` **and then repeatedly decompress file using** `gzip2 -d` **`bzip -d` commands and `tar` commands.**
+
+---
+
+## Level 13  
+**Use the command** `ssh -i sshkey.private -p 2220 bandit14@localhost`  
+**which specifies the identity file to be used for authentication (sshkey.private in this case) and then using the account bandit14 logs into the localhost. Then use** `cat` **to write out the contents of the file** `/etc/bandit_pass/bandit14`
+
+---
+
+## Level 14  
+**Use the command** `nc localhost 30000`  
+**where the command nc tells you to connect to the port number 30000 on your local machine which is exactly what the level expects us to do.**
+
+---
+
+## Level 15  
+**Use the command** `openssl s_client -connect localhost:30001`  
+**Since the data is encrypted we establish a secure ssl connection and connect the local server on port 30001 to get the password for the next level.**

user.txt

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+suvan 12345 2050
+gats 332011 900
+user1 123456 750