gcli-control 0.2.0

Remote access tool via npoint.io - encrypted command relay using AES-256-GCM

gcli

Remote access tool via npoint.io — encrypted command relay using AES-256-GCM.

How It Works

┌──────────┐     commands     ┌─────────────┐     commands     ┌──────────┐
│ gcli ssh │ ───────────────> │ npoint.io   │ ───────────────> │gcli host │
│ (client) │ <─────────────── │ (JSON bin)  │ <─────────────── │ (daemon) │
└──────────┘     results      └─────────────┘     results      └──────────┘

1. gcli host starts a background daemon that polls npoint.io for encrypted commands
2. gcli ssh connects interactively, sends encrypted commands, and polls for results
3. All payloads are encrypted with AES-256-GCM — the password never leaves your machine

Quick Start

Install

pip install cryptography

Host (on the remote machine)

# Start the daemon (runs in background)
python -m gcli host --password MySecret123

# Or run in foreground for debugging
python -m gcli host --password MySecret123 --foreground

Client (on your local machine)

# Connect to the host
python -m gcli ssh --password MySecret123

Stop the host

python -m gcli stop

SSH Commands

Once connected, you have a full interactive REPL:

Command	Description
Any text	Execute shell command on remote host
:help	Show available commands
:info	Show remote system info (hostname, OS, user, IP)
:ping	Ping remote host and show latency
:upload <local> <remote>	Upload a file to the remote host
:download <remote> <local>	Download a file from the remote host
:timeout <seconds>	Set exec command timeout
:history	Show recent command history
:exit	Disconnect and close session

Security

• AES-256-GCM encryption with PBKDF2 key derivation (600K iterations)
• Password is never transmitted — only encrypted payloads flow through npoint.io
• Each message gets a unique random nonce (prevents identical plaintext detection)
• Built-in tamper detection (GCM authentication tag)

Cross-Platform

Platform	Background Detach	Process Management
Windows	CREATE_NO_WINDOW subprocess	tasklist / taskkill
Linux	Double-fork + setsid	kill / os.kill
macOS	Double-fork + setsid	kill / os.kill

Configuration

# Custom npoint bin (both host and client must use the same bin)
python -m gcli host --password MySecret --bin YOUR_NPOINT_BIN_ID
python -m gcli ssh --password MySecret --bin YOUR_NPOINT_BIN_ID

# Adjust polling speed (default: 2s host, 1s client)
python -m gcli host --password MySecret --poll-interval 1.0

Architecture

gcli/
├── __main__.py      # CLI entry point (argparse)
├── __init__.py
├── crypto.py        # AES-256-GCM encrypt/decrypt (PBKDF2 key derivation)
├── npoint.py        # npoint.io API wrapper with retry logic
├── protocol.py      # Document structure, read/write, race-condition safe appends
├── host.py          # Daemon: poll → decrypt → execute → encrypt → respond
├── client.py        # SSH REPL: send → poll → display (tab completion)
├── utils.py         # PID management, process detach, command execution
└── colors.py        # Cross-platform terminal colours (Win/Linux/macOS)

Requirements

• Python 3.8+
• cryptography package
• Internet connection (for npoint.io)

License

MIT