SDIS P2 Module 3: Secure RMI (SSL/TLS) & Streaming Auditing

ABOUT THIS MODULE: This repository contains the final evolution (Module 3) of our Distributed Spotify architecture. It builds upon the Hybrid Streaming System from Module 2 by introducing End-to-End Encryption (SSL/TLS) for all RMI Control Plane communications and Callbacks. It also implements a Persistent Auditing System to log TCP streaming events.

⚠️ Note: If you want to test the streaming architecture without generating SSL certificates, please switch to the module-2 branch.

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Architecture & Key Features

• Secure RMI (SSL/TLS): The entire control plane (metadata fetching, playlist management, and remote triggers) is secured using SslRMIClientSocketFactory and SslRMIServerSocketFactory.
• Encrypted Callbacks: The server securely invokes methods on the client (like launching the media player) using bi-directional SSL handshakes.
• Persistent Event Logging: Implements a robust Utils logger that records stream connections, TCP client IPs, and total transmitted bytes to a physical streams.txt file for server auditing.
• Auto-Discovery & Preloading (Bonus): The server dynamically scans the mp3files/origin and jpgfiles/ directories on startup, automatically preloading all available media files and their respective covers without manual client population.
• Network-Ready: The system explicitly defines the java.rmi.server.hostname property, preventing BindExceptions and allowing deployment across different physical machines on the same LAN.

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Project Structure

Distributed-Spotify-Java-RMI
 ┣ 📂 jpgfiles/
 ┣ 📂 logs/
 ┃ ┗ 📜 streams.txt
 ┣ 📂 mp3files/
 ┃ ┣ 📂 destination/
 ┃ ┗ 📂 origin/
 ┗ 📂 src/spotify/
   ┣ 📂 media/
   ┃ ┣ 📜 Globals.java
   ┃ ┣ 📜 Media.java
   ┃ ┗ 📜 MediaPlayer.java
   ┣ 📂 rmi/
   ┃ ┣ 📂 client/
   ┃ ┃ ┣ 📜 SpotifyClientImpl.java
   ┃ ┃ ┗ 📜 SpotifyStreamingClient.java
   ┃ ┣ 📂 common/
   ┃ ┃ ┣ 📜 ServerMessages.java
   ┃ ┃ ┣ 📜 Spotify.java
   ┃ ┃ ┣ 📜 SpotifyClient.java
   ┃ ┃ ┗ 📜 SpotifyServer.java
   ┃ ┗ 📂 server/
   ┃   ┣ 📜 SpotifyLauncher.java
   ┃   ┗ 📜 SpotifyServerImpl.java
   ┣ 📂 stream/
   ┃ ┣ 📜 ClientStream.java
   ┃ ┗ 📜 ServerStream.java
   ┗ 📂 utils/
     ┣ 📜 ConcurrentMultiMap.java
     ┣ 📜 MediaDirectory.java
     ┗ 📜 Utils.java

Getting Started

1. Generate the SSL Certificate (Mandatory)

Before compiling or running, you must generate a dummy Keystore for the SSL Handshake. Open a terminal in the root directory and run:

keytool -genkey -noprompt -alias spotify -dname "CN=localhost" -keyalg RSA -keystore keystore.jks -storepass 123456 -keypass 123456
(Ensure the keystore.jks file is present in the execution directory for both Server and Client).

2. Compilation

Compile the entire project from your src directory:

javac spotify/common/*.java spotify/media/*.java spotify/utils/*.java spotify/server/*.java spotify/client/*.java spotify/stream/*.java

3. Execution

Start the Secure Server: The server will bind the secure registry and start logging to ./logs/streams.txt.

java spotify.server.SpotifyLauncher

Start the Secure Client:

java spotify.client.SpotifyStreamingClient

Interaction Example (Server Auditing) When a client streams a song, the server console and the logs/streams.txt file will register:

📝 DEBUG LOGS: Escrito registro en -> .../logs/streams.txt
[2024-05-20 18:30:15]  [STREAM] Streaming to: /127.0.0.1
[2024-05-20 18:30:16]  [STREAM] Stream finished. Tx Bytes: 242449

Authors

Iván Moro Cienfuegos, David Martín Sebastián, Eric Soto San José y Héctor