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/register` : Registriert einen neuen DNS-Eintrag. +- `POST /update` : Aktualisiert einen vorhandenen DNS-Eintrag. +- `POST /delete` : Löscht einen vorhandenen DNS-Eintrag. +- `GET /status` : Gibt den Status des Servers zurück. + +# Basiert auf DNS-01 diff --git a/dist/styles.css b/dist/styles.css new file mode 100644 index 0000000..6d5c278 --- /dev/null +++ b/dist/styles.css @@ -0,0 +1,17 @@ +.table { + display: table; +} + +.row { + display: table-row; + width: 30%; + border: 1px #888 solid; + padding: 1px; +} + +.cell { + display: table-cell; + padding: 5px; + border: 1px solid #ccc; + /* other styles */ +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..4b7da76 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,171 @@ +use axum::{ + Router, extract, + response::Json, + routing::{get, post}, +}; +use http::{StatusCode, header::HeaderMap}; +use maud::{DOCTYPE, Markup, html}; +use serde::Deserialize; +use serde_json::{Value, json}; +use std::{ + collections::HashSet, + sync::{Arc, Mutex}, +}; +use tower_http::services::ServeDir; +use tracing::info; + +mod model; +use model::{DnsRecord, User}; + +use crate::model::JsonDomain; + +#[derive(Debug, Default)] +struct AppState { + auths: Arc>>, + domains: Arc>>, +} + +impl AppState { + fn is_allowed(&self, user: &User, domain: impl Into) -> bool { + let domain = domain.into(); + self.auths.lock().map_or(false, |a| { + a.iter().any(|u| { + u.login == user.login + && u.key == user.key + && u.scope.iter().any(|s| domain.contains(s)) + }) + }) + } +} + +#[tokio::main] +async fn main() { + let shared_state = Arc::new(AppState { + auths: Arc::new(Mutex::new( + [User { + key: "geheimnis".to_string(), + login: "mig".to_string(), + scope: vec!["norbb.de".to_string(), "domain2".to_string()], + }] + .into_iter() + .collect(), + )), + domains: Arc::new(Mutex::new(HashSet::new())), + }); + // build our application with a single route + let app = Router::new() + .route("/", get(|| async { "Hello, World!" })) + .route("/register/{domain}", post(register)) + .route("/update", post(update)) + .route("/delete", post(delete)) + .route("/status", get(status)) + .nest_service("/dist", ServeDir::new("dist")) + .with_state(shared_state); + let listen = "[::]:3000"; + println!("Starting tiny-dns on: http://{listen}"); + // run our app with hyper, listening globally on port 3000 + let listener = tokio::net::TcpListener::bind(listen).await.unwrap(); + axum::serve(listener, app).await.unwrap(); +} + +#[derive(Deserialize, Debug)] +struct CreateUserPayload { + email: String, + password: Option, +} + +#[axum::debug_handler] +async fn register( + extract::Path(domain): extract::Path, + extract::State(state): extract::State>, + Json(body): Json, +) -> Json { + dbg!(&body); + Json(json!({ "domain": domain, + "email": body.email, + "password": body.password.unwrap_or_default() })) +} + +#[axum::debug_handler] +async fn update( + extract::State(state): extract::State>, + headers: HeaderMap, + extract::Json(subdomain): extract::Json, +) -> Result, StatusCode> { + let user = User::from(&headers); + // let (_, domain) = DnsRecord::split(&subdomain.subdomain); + if !state.is_allowed(&user, &subdomain.subdomain) { + info!( + "Unauthorized update attempt by user: {} @ {}", + user.login, subdomain.subdomain + ); + return Err(StatusCode::FORBIDDEN); + } + let sub = DnsRecord::from(subdomain); + dbg!(&sub); + if let Ok(mut domains) = state.domains.lock() { + domains.replace(sub); + Ok(Json(json!("OK"))) + } else { + Err(StatusCode::INTERNAL_SERVER_ERROR) + } +} + +#[axum::debug_handler] +async fn delete( + extract::State(state): extract::State>, + headers: HeaderMap, + extract::Json(subdomain): extract::Json, +) -> Result, StatusCode> { + let user = User::from(&headers); + if !state.is_allowed(&user, &subdomain.subdomain) { + info!( + "Unauthorized update attempt by user: {} @ {}", + user.login, subdomain.subdomain + ); + return Err(StatusCode::FORBIDDEN); + } + let sub = DnsRecord::from(subdomain); + if let Ok(mut domains) = state.domains.lock() { + domains.remove(&sub); + Ok(Json(json!("OK"))) + } else { + Err(StatusCode::INTERNAL_SERVER_ERROR) + } +} + +#[axum::debug_handler] +async fn status(extract::State(state): extract::State>) -> Markup { + let domains: Vec = state + .domains + .lock() + .expect("Failed to lock AppState.domains") + .iter() + .map(|d| { + html! { + div .row { + (d) div .cell { (d.age()) } + } + } + }) + .collect(); + html! { + (DOCTYPE) + meta charset="utf-8"; + title { "Status" } + link rel="stylesheet" href="dist/styles.css"; + h1 { "Status" } + h4 { "Domains"} + div .table { + @for le in &domains { + { (le) } + } + } + + } +} + +#[axum::debug_handler] +async fn health(headers: HeaderMap) -> Json { + Json(json!({ "status": "OK" })) +} diff --git a/src/model.rs b/src/model.rs new file mode 100644 index 0000000..fa1afe7 --- /dev/null +++ b/src/model.rs @@ -0,0 +1,194 @@ +use http::HeaderMap; +use maud::{Markup, Render, html}; +use serde::{Deserialize, Serialize}; +use std::{ + fmt::Display, + hash::Hash, + time::{SystemTime, UNIX_EPOCH}, +}; + +#[derive(Debug, Clone, PartialEq, Eq, Hash, Default, Deserialize, Serialize)] +pub enum DnsType { + A, + AAAA, + #[default] + TXT, +} + +impl Display for DnsType { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + match self { + DnsType::A => write!(f, "A"), + DnsType::AAAA => write!(f, "AAAA"), + DnsType::TXT => write!(f, "TXT"), + } + } +} + +#[derive(Debug, Deserialize)] +pub struct JsonDomain { + pub subdomain: String, + pub rtype: Option, + pub rdata: String, +} + +#[derive(Debug, Deserialize, Serialize)] +pub struct DnsRecord { + domain: String, + qname: String, + time: u64, + rtype: DnsType, + rdata: String, +} + +impl DnsRecord { + pub fn now() -> u64 { + SystemTime::now() + .duration_since(UNIX_EPOCH) + .unwrap() + .as_secs() + } + + /// Split a full domain into subdomain and domain. + pub fn split(fulldomain: &str) -> (String, String) { + let parts: Vec<&str> = fulldomain.split('.').collect(); + + if parts.len() < 2 { + ("_".to_owned(), fulldomain.to_owned()) + } else { + let l = parts.len() - 2; + (parts[0..l].join("."), parts[l..].join(".")) + } + } + + /// Create a new domain with a lifetime of one hour. + pub fn new_txt(subdomain: String, txt: String) -> Self { + let (qname, domain) = Self::split(&subdomain); + DnsRecord { + domain, + qname, + time: Self::now() + 3600, + rtype: DnsType::TXT, + rdata: txt, + } + } + + pub fn age(&self) -> u64 { + Self::now() + 3600 - self.time + } +} + +impl Display for DnsRecord { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + write!( + f, + "{}: {} {} {}", + self.domain, self.qname, self.rtype, self.rdata + ) + } +} + +impl Render for DnsRecord { + fn render(&self) -> Markup { + html! { + div .cell { (self.domain) } + div .cell { (self.qname) } + div .cell { (self.rtype) } + div .cell { (self.rdata) } + } + } +} + +impl From for DnsRecord { + fn from(json: JsonDomain) -> Self { + let (qname, domain) = Self::split(&json.subdomain); + DnsRecord { + domain, + qname, + time: SystemTime::now() + .duration_since(UNIX_EPOCH) + .unwrap() + .as_secs() + + 3600, + rtype: json.rtype.unwrap_or_default(), + rdata: json.rdata, + } + } +} + +impl Hash for DnsRecord { + fn hash(&self, state: &mut H) { + self.domain.hash(state); + self.qname.hash(state); + self.rtype.hash(state); + self.rdata.hash(state); + } +} + +impl Eq for DnsRecord {} + +impl PartialEq for DnsRecord { + fn eq(&self, other: &Self) -> bool { + self.domain == other.domain + && self.qname == other.qname + && self.rtype == other.rtype + && self.rdata == other.rdata + } +} + +#[derive(Debug)] +pub struct User { + pub login: String, + pub key: String, + pub scope: Vec, +} + +impl From<&HeaderMap> for User { + fn from(headers: &HeaderMap) -> Self { + let login = headers + .get("x-api-user") + .and_then(|v| v.to_str().ok()) + .unwrap_or_default() + .to_string(); + let key = headers + .get("x-api-key") + .and_then(|v| v.to_str().ok()) + .unwrap_or_default() + .to_string(); + User { + login, + key, + scope: Vec::new(), + } + } +} + +impl Eq for User {} + +impl PartialEq for User { + fn eq(&self, other: &Self) -> bool { + self.login == other.login && self.key == other.key + } +} + +impl Hash for User { + fn hash(&self, state: &mut H) { + self.login.hash(state); + self.key.hash(state); + } +} + +#[test] +fn domain_split() { + let (subdomain, domain) = DnsRecord::split("example.com"); + assert_eq!(subdomain, ""); + assert_eq!(domain, "example.com"); + + let (subdomain, domain) = DnsRecord::split("sub.example.com"); + assert_eq!(subdomain, "sub"); + assert_eq!(domain, "example.com"); + + let (subdomain, domain) = DnsRecord::split("sub.sub.example.com"); + assert_eq!(subdomain, "sub.sub"); + assert_eq!(domain, "example.com"); +}