Keylogger

Prerequisites

Before you begin, ensure the following library is installed:

1. libwebsockets

Build and Usage

gcc -o nob nob.c
./nob

If target device is incorrect. Use the --dev <PATH> option to specify a device event. List available devices run ls -l /dev/input/by-id/

sudo out/keylogger --dev /dev/input/event7 --printk

There is a list of options available:

sudo out/keylogger [OPTIONS]

Options:
    --dev     [path]   Specify the device event to use (default: /dev/input/event?)
    --printk           Show keystrokes in terminal
    --port    [port]   Specify websocket port (default: 33300)
    -h,--help          Display help message and exit

Want to try using Nix?

nix run github:ryhkml/keylogger -- --dev /dev/input/event? --printk

WebSocket Secure (wss)

The keylogger server also supports secure WebSocket connections. Set an environment variable with the path to your certificate and private key files.

# Required
export KEYLOGGER_SSL_CERT_PATH="PATH_TO_CERT.pem"
export KEYLOGGER_SSL_KEY_PATH="PATH_TO_KEY.pem"
# Optional
export KEYLOGGER_SSL_CA_PATH=

Design Your Own Keystrokes

Just create an index.html file as a client to receive keystrokes from the server.

sample-obs-overlay.mp4

Test

./nob test

Rootless

Warning

Rootless method gives you direct access to your keyboard.

To run rootless, follow these steps:

1. Create a udev rules file (for example, /etc/udev/rules.d/90-keylogger.rules)

   echo "SUBSYSTEM==\"input\", OWNER=\"$USER\", MODE=\"0660\"" | sudo tee /etc/udev/rules.d/90-keylogger.rules > /dev/null

2. Reload udev rules

   sudo udevadm control --reload-rules
   sudo udevadm trigger