Secure Chat Server

This is a simple secure chat server implemented in Python. It allows two clients to connect, exchange public keys for secure communication, and send messages to each other.

Client Application

The client application is necessary to connect to this secure chat server. You can find the client application repository and instructions on how to set it up below:

https://github.com/Arad-Afzali/secure-messaging-client-side

Please follow the installation and usage instructions in the client application's README to ensure proper communication with the server.

Features

• Supports two clients.
• Exchanges public keys for secure communication and removes them immediately when they are not needed.
• Routes messages between clients (note: the server does not have access to the messages as they are encrypted by the clients).
• Disconnects all clients when more than two clients attempt to connect.

Requirements

• Python 3.x
• openssl (for SSL/TLS support, Optional but Recommended)

Installation

1. Clone the repository:

   git clone https://github.com/Arad-Afzali/secure-messaging-server-side.git
   cd secure-messaging-server-side

Note (Optional but Recommended Steps)

2. Generate SSL/TLS certificates:

   # Generate a new RSA private key
   openssl genrsa -out server.key 4096
   
   # Generate a Certificate Signing Request (CSR)
   openssl req -new -key server.key -out server.csr
   
   # Generate a self-signed SSL certificate
   openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

3. SSL/TLS Support

   To enable SSL/TLS support, first you should uncomment the relevant sections in the ChatServer class and provide the paths to your certificate and key files:

   #uncomment these sections in the code:
   
   self.context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
   self.context.load_cert_chain(certfile='server.crt', keyfile='server.key')
   
   #---------
   
   client_socket = self.context.wrap_socket(client_socket, server_side=True)
   

Usage

1. Start the server:

   python3 server.py

   Note

   You should change the IP address and port in the server.py. The default IP address in 127.0.0.1 and the default port is 7004.

2. Connect clients to the server using the client application.

Contributing

Contributions are welcome! Please open an issue or submit a pull request.