Created
July 22, 2025 22:21
-
-
Save Wind010/92a2d3a2b38e6983bca40950558c7083 to your computer and use it in GitHub Desktop.
NATS proxy script that could be used as MiTM attacks.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import socket | |
| import threading | |
| import argparse | |
| import sys | |
| LISTEN_HOST = '0.0.0.0' | |
| LISTEN_PORT = 4222 | |
| REAL_PORT = 4222 # Fixed NATS port | |
| def handle_client(client_sock, real_host): | |
| remote_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
| try: | |
| remote_sock.connect((real_host, REAL_PORT)) | |
| except Exception as e: | |
| print(f"[!] Failed to connect to real server {real_host}:{REAL_PORT} - {e}") | |
| client_sock.close() | |
| return | |
| def forward(src, dst): | |
| try: | |
| while True: | |
| data = src.recv(4096) | |
| if not data: | |
| break | |
| print(f"[DATA] {data.decode(errors='ignore')}") | |
| dst.sendall(data) | |
| except Exception: | |
| pass | |
| finally: | |
| src.close() | |
| dst.close() | |
| threading.Thread(target=forward, args=(client_sock, remote_sock), daemon=True).start() | |
| threading.Thread(target=forward, args=(remote_sock, client_sock), daemon=True).start() | |
| def start_proxy(real_host): | |
| server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
| server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | |
| server.bind((LISTEN_HOST, LISTEN_PORT)) | |
| server.listen(5) | |
| server.settimeout(1.0) | |
| print(f"[+] Proxy listening on {LISTEN_HOST}:{LISTEN_PORT} -> {real_host}:{REAL_PORT}") | |
| try: | |
| while True: | |
| try: | |
| client_sock, addr = server.accept() | |
| print(f"[+] Connection from {addr}") | |
| threading.Thread(target=handle_client, args=(client_sock, real_host), daemon=True).start() | |
| except socket.timeout: | |
| continue | |
| except KeyboardInterrupt: | |
| print("\n[!] Shutting down proxy.") | |
| finally: | |
| server.close() | |
| if __name__ == "__main__": | |
| parser = argparse.ArgumentParser(description="NATS TCP Proxy") | |
| parser.add_argument("real_host", help="IP address of the real NATS server") | |
| args = parser.parse_args() | |
| start_proxy(args.real_host) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment