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Config { + pub meta: ServerMeta, +} + +impl Config { + pub fn new() -> Self { + Self { + meta: ServerMeta { + name: "New Server".to_string(), + description: String::new(), + }, + } + } + + pub async fn get() -> anyhow::Result { + let config_path = PathBuf::from("config.json"); + + if !config_path.exists() { + let config = Config::new(); + tokio::fs::write(config_path, &serde_json::to_string_pretty(&config)?).await?; + Ok(config) + } else { + Ok(serde_json::from_str( + &tokio::fs::read_to_string(config_path).await?, + )?) + } + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..a4db3c4 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,39 @@ +pub mod config; +pub mod protocol; +pub mod server; +pub mod signature; + +use std::sync::Arc; + +use axum::{ + Router, + extract::{State, WebSocketUpgrade}, + response::Response, + routing::{any, get}, +}; + +use crate::server::Server; + +#[tokio::main] +async fn main() -> anyhow::Result<()> { + let server = Server::new().await?; + + let app = Router::new() + .route("/meta", get(meta)) + .route("/", any(ws_handler)) + .with_state(server); + + let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await?; + + axum::serve(listener, app).await?; + + Ok(()) +} + +async fn meta(State(server): State>) -> String { + serde_json::to_string(&server.config.meta.clone()).unwrap() +} + +async fn ws_handler(State(server): State>, ws: WebSocketUpgrade) -> Response { + server.ws_handler(ws).await +} diff --git a/src/protocol/initialize.rs b/src/protocol/initialize.rs new file mode 100644 index 0000000..40b4d79 --- /dev/null +++ b/src/protocol/initialize.rs @@ -0,0 +1,87 @@ +use std::{ + sync::Arc, + time::{SystemTime, UNIX_EPOCH}, +}; + +use axum::extract::ws::WebSocket; +use ed25519_dalek::Signer; + +use crate::server::Server; + +use super::*; + +impl super::Client { + pub async fn initialize(server: &Arc, mut socket: WebSocket) -> anyhow::Result { + let Some(ServerMethod::Initialize { + public_key: public_key_string, + signature, + + timestamp, + hostname, + }) = Client::read_socket(&mut socket).await? + else { + Client::send_socket( + &mut socket, + ClientMethod::Error { + error: Cow::Borrowed("Initialization required"), + }, + ) + .await?; + + return Err(anyhow::anyhow!( + "Failed to initialize: Client sent the wrong method" + )); + }; + + let public_key = crate::signature::from_string(&public_key_string)?; + + if public_key + .verify_strict( + format!("{timestamp}@{hostname}").as_bytes(), + &crate::signature::from_string_sig(&signature)?, + ) + .is_ok() + { + return Err(anyhow::anyhow!("Invalid signature")); + } + + { + let timestamp = SystemTime::now().duration_since(UNIX_EPOCH)?.as_secs(); + + Client::send_socket( + &mut socket, + ClientMethod::Initialized { + public_key: crate::signature::to_string(&server.key.verifying_key()), + signature: server + .key + .sign(format!("{timestamp}@{hostname}@{public_key_string}").as_bytes()) + .to_string(), + + timestamp, + hostname, + }, + ) + .await?; + } + + let Some(ServerMethod::Meta(meta)) = Client::read_socket(&mut socket).await? else { + Client::send_socket( + &mut socket, + ClientMethod::Error { + error: Cow::Borrowed("Expected meta"), + }, + ) + .await?; + + return Err(anyhow::anyhow!( + "Expected meta, client called another method" + )); + }; + + Ok(Self { + socket, + meta, + public_key, + }) + } +} diff --git a/src/protocol/mod.rs b/src/protocol/mod.rs new file mode 100644 index 0000000..460530f --- /dev/null +++ b/src/protocol/mod.rs @@ -0,0 +1,127 @@ +use std::borrow::Cow; + +use axum::extract::ws::{Message, Utf8Bytes, WebSocket}; +use ed25519_dalek::VerifyingKey; +use serde::{Deserialize, Serialize}; + +pub mod initialize; + +pub struct Client { + pub socket: WebSocket, + pub meta: ClientMeta, + pub public_key: VerifyingKey, +} + +#[derive(Debug, Clone, Serialize, Deserialize)] +pub struct ClientMeta {} + +#[derive(Debug, Clone, Serialize, Deserialize)] +pub struct ServerMeta { + pub name: String, + pub description: String, +} + +#[derive(Debug, Clone, Serialize, Deserialize)] +#[serde(tag = "method")] +pub enum ClientMethod { + Initialized { + public_key: String, + signature: String, + + timestamp: u64, + hostname: String, + }, + + Error { + error: Cow<'static, str>, + }, +} + +#[derive(Debug, Clone, Serialize, Deserialize)] +#[serde(tag = "method")] +pub enum ServerMethod { + Initialize { + public_key: String, + signature: String, + + timestamp: u64, + hostname: String, + }, + + Meta(ClientMeta), + + Error { + error: String, + }, +} + +impl Client { + pub async fn read_loop(&mut self) -> anyhow::Result<()> { + while let Some(message) = self.read().await? { + match message { + ServerMethod::Initialize { .. } => { + self.send(ClientMethod::Error { + error: Cow::Borrowed("Already initialized"), + }) + .await?; + } + + ServerMethod::Meta(meta) => {} + + ServerMethod::Error { error } => { + eprintln!("Client error: {error}"); + } + } + } + + Ok(()) + } + + pub async fn read_socket(socket: &mut WebSocket) -> anyhow::Result> { + match socket.recv().await.transpose()? { + Some(Message::Text(text)) => { + if let Ok(msg) = serde_json::from_str(&text.to_string()) { + Ok(Some(msg)) + } else { + Client::send_socket( + socket, + ClientMethod::Error { + error: Cow::Borrowed("Unable to parse message: {text}"), + }, + ) + .await?; + + Ok(None) + } + } + + Some(Message::Ping(v)) => { + socket.send(Message::Pong(v)).await?; + + Ok(None) + } + + Some(_) => Ok(None), + + None => Ok(None), + } + } + + pub async fn send_socket(socket: &mut WebSocket, message: ClientMethod) -> anyhow::Result<()> { + socket + .send(Message::Text(Utf8Bytes::from(serde_json::to_string( + &message, + )?))) + .await?; + + Ok(()) + } + + pub async fn read(&mut self) -> anyhow::Result> { + Self::read_socket(&mut self.socket).await + } + + pub async fn send(&mut self, message: ClientMethod) -> anyhow::Result<()> { + Self::send_socket(&mut self.socket, message).await + } +} diff --git a/src/server.rs b/src/server.rs new file mode 100644 index 0000000..0eb6d92 --- /dev/null +++ b/src/server.rs @@ -0,0 +1,45 @@ +use std::sync::Arc; + +use axum::{ + extract::{WebSocketUpgrade, ws::WebSocket}, + response::Response, +}; +use ed25519_dalek::SigningKey; + +use crate::{config::Config, protocol::Client}; + +pub struct Server { + pub key: SigningKey, + pub config: Config, +} + +impl Server { + pub async fn new() -> anyhow::Result> { + Ok(Arc::new(Self { + key: crate::signature::get().await?, + config: Config::get().await?, + })) + } +} + +impl Server { + pub async fn ws_handler(self: &Arc, ws: WebSocketUpgrade) -> Response { + let s = self.clone(); + + ws.on_upgrade(move |socket: WebSocket| async move { + match Client::initialize(&s, socket).await { + Ok(mut client) => { + if let Err(e) = client.read_loop().await { + eprintln!("Failed to handle client: {e}"); + } else { + println!("Client connection closed") + } + } + + Err(e) => { + eprintln!("Failed to initialize client: {e}") + } + } + }) + } +} diff --git a/src/signature.rs b/src/signature.rs new file mode 100644 index 0000000..851b9eb --- /dev/null +++ b/src/signature.rs @@ -0,0 +1,43 @@ +use std::path::PathBuf; + +use ed25519_dalek::{Signature, SigningKey, VerifyingKey}; +use rand::rngs::OsRng; + +pub async fn get() -> anyhow::Result { + let private_key_path = PathBuf::from("private.key"); + + if !private_key_path.exists() { + let key = SigningKey::generate(&mut OsRng); + tokio::fs::write(private_key_path, &key.to_bytes()).await?; + Ok(key) + } else { + Ok(SigningKey::from_bytes( + &tokio::fs::read(private_key_path) + .await? + .try_into() + .map_err(|_| anyhow::anyhow!("Invalid private key"))?, + )) + } +} + +pub fn to_string(key: &VerifyingKey) -> String { + bs58::encode(key.to_bytes()).into_string() +} + +pub fn from_string(key: &str) -> anyhow::Result { + Ok(VerifyingKey::from_bytes( + &bs58::decode(key) + .into_vec()? + .try_into() + .map_err(|_| anyhow::anyhow!("Invalid public key"))?, + )?) +} + +pub fn from_string_sig(signature: &str) -> anyhow::Result { + Ok(Signature::from_bytes( + &bs58::decode(signature) + .into_vec()? + .try_into() + .map_err(|_| anyhow::anyhow!("Invalid public key"))?, + )) +}