✨ mqtt connections

almost working, need encryption

.gitignore

@@ -1 +1,6 @@
-/target
+/target
+/mosquitto/data
+/mosquitto/log
+/homeserver/age.key
+/homeserver/sign.key
+/homeserver/db

Cargo.toml

@@ -33,3 +33,6 @@ rand = "0.9.1"
 based = { git = "https://git.hydrar.de/jmarya/based", branch = "owl" }
 http2 = "0.4.21"
 ureq = { version = "3.0.11", features = ["json"] }
+rumqttc = { version = "0.24.0", features = ["url", "websocket"] }
+age = { version = "0.11.1", features = ["aes", "aes-gcm", "armor", "async", "ssh"] }
+minisign = "0.7.9"

docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  mosquitto:
+    image: eclipse-mosquitto:2
+    container_name: mosquitto
+    ports:
+      #- "1883:1883"    # MQTT (classic TCP)
+      - "8083:8083"    # MQTT over WebSocket
+    volumes:
+      - ./mosquitto/config:/mosquitto/config
+      - ./mosquitto/data:/mosquitto/data
+      - ./mosquitto/log:/mosquitto/log
+    restart: unless-stopped

homeserver/config.toml

@@ -0,0 +1 @@
+mqtt = "ws://127.0.0.1:8083"

justfile

@@ -0,0 +1,3 @@
+
+server:
+    cargo run --bin homeserver --features homeserver

mosquitto/config/mosquitto.conf

@@ -0,0 +1,17 @@
+# mosquitto.conf
+
+# Standard MQTT listener (for regular clients, optional)
+listener 1883
+protocol mqtt
+
+# WebSocket MQTT listener
+listener 8083
+protocol websockets
+
+# Allow anonymous connections (testing)
+allow_anonymous true
+
+max_packet_size 10485760  # 10 MB
+
+# Logging
+log_dest stdout

src/api.rs

@@ -1,8 +1,185 @@
+use age::{Recipient, secrecy::ExposeSecret};
+use based::auth::{Sessions, User};
+use minisign::PublicKey;
 use owl::{Deserialize, Serialize};
+use owl::{prelude::*, query, save, set_global_db};
+use rumqttc::{AsyncClient, Event, EventLoop, MqttOptions, Packet, Transport};
+use std::io::{Read, Seek};
+use std::time::Duration;
+use std::{
+    io::{BufReader, Cursor},
+    net::SocketAddr,
+    path::PathBuf,
+    str::FromStr,
+};
+use tokio::time::sleep;
 
 #[derive(Deserialize, Serialize)]
 pub struct JoinParams {
     pub join_token: Option<String>,
     pub machine_id: String,
     pub hostname: String,
+    pub identity: (String, String),
+}
+
+#[derive(Deserialize, Serialize)]
+pub struct JoinResponse {
+    pub token: String,
+    pub identity: (String, String),
+    pub mqtt: String,
+}
+
+pub fn mqtt_connect(machine_id: &str, mqtt: &str) -> (rumqttc::AsyncClient, rumqttc::EventLoop) {
+    let mqttoptions = if mqtt.starts_with("ws://") {
+        log::warn!("Using unencrypted WebSocket connection");
+        let mut mqttoptions = MqttOptions::new(
+            machine_id,
+            &format!("ws://{}", mqtt.trim_start_matches("ws://")),
+            8000,
+        );
+
+        mqttoptions.set_transport(Transport::Ws);
+        mqttoptions.set_keep_alive(Duration::from_secs(60));
+        mqttoptions
+    } else {
+        log::info!("Using encrypted WebSocket connection");
+        let mut mqttoptions = MqttOptions::new(
+            machine_id,
+            &format!("wss://{}", mqtt.trim_start_matches("wss://")),
+            8000,
+        );
+
+        mqttoptions.set_transport(Transport::wss_with_default_config());
+        mqttoptions.set_keep_alive(Duration::from_secs(60));
+        mqttoptions
+    };
+
+    AsyncClient::new(mqttoptions, 10)
+}
+
+pub async fn run_event_loop(mut eventloop: EventLoop) {
+    log::info!("Handling MQTT events");
+    loop {
+        match eventloop.poll().await {
+            Ok(Event::Incoming(incoming)) => {
+                log::trace!("Incoming = {:?}", incoming);
+                match incoming {
+                    Packet::Publish(publish) => {
+                        let s = publish.payload;
+                        // TODO : client decryption here
+                        println!("got payload {}", String::from_utf8(s.to_vec()).unwrap());
+                    }
+                    _ => {}
+                }
+            }
+            Ok(Event::Outgoing(outgoing)) => {
+                log::trace!("Outgoing = {:?}", outgoing);
+            }
+            Err(e) => {
+                log::error!("MQTT eventloop error = {:?}", e);
+                sleep(Duration::from_secs(1)).await;
+            }
+        }
+    }
+}
+
+pub struct Identity {
+    pub age: age::x25519::Identity,
+    pub sign: minisign::KeyPair,
+}
+
+fn save_parts(part1: &[u8], part2: &[u8]) -> Vec<u8> {
+    let mut vec = Vec::new();
+
+    let offset = part1.len() as u32; // assume it fits into u32
+    vec.extend_from_slice(&offset.to_le_bytes()); // or to_be_bytes() for big-endian
+
+    vec.extend_from_slice(part1);
+    vec.extend_from_slice(part2);
+
+    vec
+}
+
+fn load_parts(data: &[u8]) -> (Vec<u8>, Vec<u8>) {
+    let offset_bytes: [u8; 4] = data[..4].try_into().unwrap();
+    let offset = u32::from_le_bytes(offset_bytes) as usize;
+
+    let part1 = data[4..4 + offset].to_vec();
+    let part2 = data[4 + offset..].to_vec();
+
+    (part1, part2)
+}
+
+impl Identity {
+    pub fn new() -> Self {
+        let age = age::x25519::Identity::generate();
+        let sign = minisign::KeyPair::generate_encrypted_keypair(Some(String::new())).unwrap();
+        Self { age, sign }
+    }
+
+    pub fn public(&self) -> (String, String) {
+        (self.pub_key_age(), self.pub_key_sign())
+    }
+
+    pub fn pub_key_age(&self) -> String {
+        self.age.to_public().to_string()
+    }
+
+    pub fn pub_key_sign(&self) -> String {
+        self.sign.pk.to_box().unwrap().to_string()
+    }
+
+    pub fn save(&self, dir: &PathBuf) {
+        let age_key = self.age.to_string();
+        std::fs::write(dir.join("age.key"), age_key.expose_secret().to_string()).unwrap();
+
+        let kbx = self.sign.sk.to_box(None).unwrap();
+
+        std::fs::write(dir.join("sign.key"), kbx.into_string()).unwrap();
+        log::info!("Saved identity to {dir:?}");
+    }
+
+    pub fn try_load(dir: &PathBuf) -> Option<Self> {
+        let age =
+            age::x25519::Identity::from_str(&std::fs::read_to_string(dir.join("age.key")).ok()?)
+                .unwrap();
+        let kbx = minisign::SecretKeyBox::from_string(
+            &std::fs::read_to_string(dir.join("sign.key")).ok()?,
+        )
+        .unwrap();
+        let sign = kbx.into_secret_key(Some(String::new())).unwrap();
+        let pk = minisign::PublicKey::from_secret_key(&sign).ok()?;
+        let kp = minisign::KeyPair { pk: pk, sk: sign };
+        log::info!("Loaded identity from {dir:?}");
+        Some(Self { age, sign: kp })
+    }
+
+    pub fn encrypt(&self, data: &[u8], recipient: &impl Recipient) -> Vec<u8> {
+        let signed =
+            minisign::sign(None, &self.sign.sk, data, Some("mynameisanubis"), None).unwrap();
+        let signed = save_parts(&signed.to_bytes(), data);
+        let enc = age::encrypt(recipient, &signed).unwrap();
+        enc
+    }
+
+    pub fn decrypt(&self, data: &[u8], pk: &PublicKey) -> Option<Vec<u8>> {
+        let dec = age::decrypt(&self.age, data).unwrap();
+        let (sig, data) = load_parts(&dec);
+        let sign_box =
+            minisign::SignatureBox::from_string(&String::from_utf8(sig).unwrap()).unwrap();
+        if minisign::verify(
+            pk,
+            &sign_box,
+            BufReader::new(Cursor::new(data.clone())),
+            true,
+            false,
+            false,
+        )
+        .is_ok()
+        {
+            return Some(data);
+        }
+
+        None
+    }
 }

src/server.rs

@@ -1,3 +1,4 @@
+use age::{Recipient, secrecy::ExposeSecret};
 use axum::{
     Json, Router,
     http::StatusCode,
@@ -5,14 +6,32 @@ use axum::{
 };
 use axum_client_ip::{ClientIp, ClientIpSource};
 use based::auth::{Sessions, User};
-use owl::{prelude::*, save, set_global_db};
+use minisign::PublicKey;
+use owl::{prelude::*, query, save, set_global_db};
 use rand::RngCore;
+use rumqttc::{AsyncClient, Event};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
-use std::net::SocketAddr;
+use std::{
+    io::{BufReader, Cursor},
+    net::SocketAddr,
+    path::PathBuf,
+    str::FromStr,
+    time::Duration,
+};
 mod api;
+use std::io::{Read, Seek};
 mod server_core;
-use server_core::route::{join_device, login_user};
+use crate::api::Identity;
+use server_core::model::Machine;
+use server_core::{
+    config::Config,
+    route::{join_device, login_user},
+};
+use tokio::sync::OnceCell;
+
+pub static IDENTITY: OnceCell<Identity> = OnceCell::const_new();
+pub static CONFIG: OnceCell<Config> = OnceCell::const_new();
 
 fn generate_token() -> String {
     let mut rng = rand::rng();
@@ -25,13 +44,22 @@ fn generate_token() -> String {
 #[tokio::main]
 async fn main() {
     tracing_subscriber::fmt::init();
+    let i = if let Some(i) = Identity::try_load(&PathBuf::from("./homeserver")) {
+        i
+    } else {
+        let i = Identity::new();
+        i.save(&PathBuf::from("./homeserver"));
+        i
+    };
+    let _ = crate::IDENTITY.set(i);
 
-    let db = Database::in_memory();
+    let config = Config::default();
+    let _ = crate::CONFIG.set(config);
+
+    let db = Database::filesystem("./homeserver/db");
     set_global_db!(db);
 
-    User::create("admin".to_string(), "admin", based::auth::UserRole::Admin)
-        .await
-        .unwrap();
+    let _ = User::create("admin".to_string(), "admin", based::auth::UserRole::Admin).await;
 
     let device = Router::new()
         .route("/join", post(join_device))
@@ -44,11 +72,51 @@ async fn main() {
 
     log::info!("Starting server");
 
-    let listener = tokio::net::TcpListener::bind("0.0.0.0:8000").await.unwrap();
-    axum::serve(
-        listener,
-        app.into_make_service_with_connect_info::<SocketAddr>(),
-    )
-    .await
-    .unwrap();
+    let (client, mut eventloop) = api::mqtt_connect("server", &crate::CONFIG.get().unwrap().mqtt);
+
+    tokio::spawn(async move {
+        loop {
+            let machines: Vec<Model<Machine>> = query!(|_| true);
+            for machine in machines {
+                let machine_id = machine.read().id.to_string();
+                let machine_id = machine_id.trim();
+                log::info!("Pushing topic to {machine_id}");
+                client
+                    .publish(
+                        format!("{machine_id}/cmd"),
+                        rumqttc::QoS::AtMostOnce,
+                        false,
+                        "Hello World".as_bytes(),
+                    )
+                    .await
+                    .unwrap();
+            }
+            tokio::time::sleep(Duration::from_secs(5)).await;
+        }
+    });
+
+    tokio::spawn(async {
+        let listener = tokio::net::TcpListener::bind("0.0.0.0:8000").await.unwrap();
+        axum::serve(
+            listener,
+            app.into_make_service_with_connect_info::<SocketAddr>(),
+        )
+        .await
+        .unwrap();
+    });
+
+    api::run_event_loop(eventloop).await;
+}
+
+pub fn send_rpc(client: AsyncClient, Machine: &Model<Machine>) {
+    // TODO : pub encryption here
+    client
+        .publish(
+            format!("{machine_id}/cmd"),
+            rumqttc::QoS::AtMostOnce,
+            true,
+            "Hello World".as_bytes(),
+        )
+        .await
+        .unwrap();
 }

src/server_core/config.rs

@@ -1,10 +1,13 @@
 use serde::{Deserialize, Serialize};
 
 #[derive(Serialize, Deserialize)]
-pub struct Config {}
+pub struct Config {
+    /// Public MQTT endpoint
+    pub mqtt: String,
+}
 
 impl Default for Config {
     fn default() -> Self {
-        toml::from_str(&std::fs::read_to_string("./config.toml").unwrap()).unwrap()
+        toml::from_str(&std::fs::read_to_string("./homeserver/config.toml").unwrap()).unwrap()
     }
 }

src/server_core/model.rs

@@ -7,14 +7,16 @@ pub struct Machine {
     pub id: Id,
     pub hostname: String,
     pub token: String,
+    pub identity: (String, String),
     pub next_token: Option<String>,
 }
 
 impl Machine {
     pub fn from_join_param(join: api::JoinParams) -> Self {
         Self {
-            id: Id::String(join.machine_id),
+            id: Id::String(join.machine_id.trim().to_string()),
             hostname: join.hostname.trim().to_string(),
+            identity: join.identity,
             token: generate_token(),
             next_token: None,
         }

src/server_core/route.rs

@@ -1,4 +1,5 @@
 use crate::api;
+use crate::api::JoinResponse;
 use crate::server_core::model::Machine;
 use axum::Json;
 use axum::http::StatusCode;
@@ -44,5 +45,14 @@ pub async fn join_device(
 
     save!(machine);
 
-    (StatusCode::OK, Json(json!({"ok": new_token})))
+    let i = crate::IDENTITY.get().unwrap();
+
+    (
+        StatusCode::OK,
+        Json(json!(JoinResponse {
+            token: new_token,
+            identity: i.public(),
+            mqtt: crate::CONFIG.get().unwrap().mqtt.clone()
+        })),
+    )
 }

src/sheepd.rs

@@ -1,8 +1,22 @@
-use sheepd_core::args::{SheepdArgs, SheepdCommand};
+use api::Identity;
+use sheepd_core::{
+    args::{SheepdArgs, SheepdCommand},
+    config::AgentConfig,
+};
 mod api;
 mod sheepd_core;
+use rumqttc::{AsyncClient, Event, MqttOptions, QoS, Transport};
+use std::{error::Error, path::PathBuf, time::Duration};
+use tokio::{
+    sync::OnceCell,
+    task,
+    time::{self, sleep},
+};
 
-fn main() {
+pub static MQTT: OnceCell<AsyncClient> = OnceCell::const_new();
+
+#[tokio::main]
+async fn main() {
     tracing_subscriber::fmt::init();
     let args: SheepdArgs = argh::from_env();
 
@@ -13,6 +27,40 @@ fn main() {
     } else {
         log::info!("Starting sheepd");
 
-        // TODO : daemon loop
+        let conf = AgentConfig::try_load();
+        if conf.is_none() {
+            log::error!("No config file at /etc/sheepd/config.toml");
+            std::process::exit(1);
+        }
+
+        let i = if let Some(i) = Identity::try_load(&PathBuf::from("/etc/sheepd")) {
+            i
+        } else {
+            let i = Identity::new();
+            i.save(&PathBuf::from("/etc/sheepd"));
+            i
+        };
+
+        let conf = conf.unwrap();
+        let machine_id = std::fs::read_to_string("/etc/machine-id").unwrap();
+        let machine_id = machine_id.trim();
+
+        log::info!("Connecting to MQTT as {machine_id}");
+
+        let (client, mut eventloop) = api::mqtt_connect(machine_id, &conf.mqtt);
+
+        crate::MQTT.set(client).unwrap();
+
+        log::info!("Connection done");
+
+        log::info!("Start sub for {}", format!("{machine_id}/cmd"));
+        crate::MQTT
+            .get()
+            .unwrap()
+            .subscribe(format!("{machine_id}/cmd"), QoS::AtMostOnce)
+            .await
+            .unwrap();
+
+        api::run_event_loop(eventloop).await;
     }
 }

src/sheepd_core/cmd.rs

@@ -1,37 +1,53 @@
-use crate::{api, sheepd_core::config::AgentConfig};
+use std::path::PathBuf;
+
+use crate::{
+    api::{self, Identity, JoinResponse},
+    sheepd_core::config::AgentConfig,
+};
 
 use super::args::JoinCommand;
 
+fn domain(host: &str) -> String {
+    if host.starts_with("http") {
+        return host.to_string();
+    } else {
+        format!("https://{host}")
+    }
+}
+
 pub fn join(conf: JoinCommand) {
     // TODO : check for root
     // TODO : check if joined somewhere already
 
     log::info!("Joining to {}", conf.home);
 
-    let url = format!("http://{}/join", conf.home);
+    let _ = std::fs::create_dir_all("/etc/sheepd");
+
+    let i = if let Some(i) = Identity::try_load(&PathBuf::from("/etc/sheepd")) {
+        i
+    } else {
+        let i = Identity::new();
+        i.save(&PathBuf::from("/etc/sheepd"));
+        i
+    };
+
+    let url = format!("{}/join", domain(&conf.home));
     println!("{url}");
     let mut res = ureq::post(url)
         .send_json(&api::JoinParams {
             join_token: None,
             machine_id: std::fs::read_to_string("/etc/machine-id").unwrap(),
             hostname: std::fs::read_to_string("/etc/hostname").unwrap(),
+            identity: i.public(),
         })
         .unwrap();
-    let res: serde_json::Value = res.body_mut().read_json().unwrap();
-
-    let token = res
-        .as_object()
-        .unwrap()
-        .get("ok")
-        .unwrap()
-        .as_str()
-        .unwrap();
+    let res: JoinResponse = res.body_mut().read_json().unwrap();
 
     log::info!("Joined {} successfully", conf.home);
 
     std::fs::write(
-        "/etc/sheepd.toml",
-        toml::to_string(&AgentConfig::new(&conf.home, token)).unwrap(),
+        "/etc/sheepd/config.toml",
+        toml::to_string(&AgentConfig::new(&conf.home, res)).unwrap(),
     )
     .unwrap();
 }

src/sheepd_core/config.rs

@@ -1,16 +1,28 @@
 use owl::{Deserialize, Serialize};
 
+use crate::api::JoinResponse;
+
 #[derive(Serialize, Deserialize)]
 pub struct AgentConfig {
     pub home: String,
     pub token: String,
+    pub mqtt: String,
+    pub server_age: String,
+    pub server_sign: String,
 }
 
 impl AgentConfig {
-    pub fn new(home_server: &str, token: &str) -> Self {
+    pub fn try_load() -> Option<Self> {
+        toml::from_str(&std::fs::read_to_string("/etc/sheepd/config.toml").ok()?).ok()
+    }
+
+    pub fn new(home: &str, join: JoinResponse) -> Self {
         Self {
-            home: home_server.to_string(),
-            token: token.to_string(),
+            token: join.token,
+            mqtt: join.mqtt,
+            home: home.to_string(),
+            server_age: join.identity.0,
+            server_sign: join.identity.1,
         }
     }
 }