Better handle get_cert for https request (faster path, hostname verification)

src/cert_store.rs

@@ -19,20 +19,21 @@ use crate::proxy_config::ProxyConfig;
 pub struct CertStore {
 	consul: Consul,
 	certs: RwLock<HashMap<String, Arc<Cert>>>,
+	rx_proxy_config: watch::Receiver<Arc<ProxyConfig>>,
 }
 
 impl CertStore {
-	pub fn new(consul: Consul) -> Arc<Self> {
+	pub fn new(consul: Consul, rx_proxy_config: watch::Receiver<Arc<ProxyConfig>>) -> Arc<Self> {
 		Arc::new(Self {
 			consul,
 			certs: RwLock::new(HashMap::new()),
+			rx_proxy_config,
 		})
 	}
 
-	pub async fn watch_proxy_config(
-		self: Arc<Self>,
-		mut rx_proxy_config: watch::Receiver<Arc<ProxyConfig>>,
-	) {
+	pub async fn watch_proxy_config(self: Arc<Self>) {
+		let mut rx_proxy_config = self.rx_proxy_config.clone();
+
 		while rx_proxy_config.changed().await.is_ok() {
 			let mut domains: HashSet<String> = HashSet::new();
 
@@ -50,6 +51,35 @@ impl CertStore {
 		}
 	}
 
+	pub fn get_cert_for_https(self: &Arc<Self>, domain: &str) -> Result<Arc<Cert>> {
+		// Check if domain is authorized
+		if !self
+			.rx_proxy_config
+			.borrow()
+			.entries
+			.iter()
+			.any(|ent| ent.host == domain)
+		{
+			bail!("Domain {} should not have a TLS certificate.", domain);
+		}
+
+		// Check in local memory if it exists
+		let certs = self.certs.read().unwrap();
+		if let Some(cert) = certs.get(domain) {
+			if !cert.is_old() {
+				return Ok(cert.clone());
+			}
+		}
+
+		// Not found in local memory
+		tokio::spawn(self.clone().get_cert_task(domain.to_string()));
+		bail!("Certificate not found (will try to get it in background)");
+	}
+
+	pub async fn get_cert_task(self: Arc<Self>, domain: String) -> Result<Arc<Cert>> {
+		self.get_cert(domain.as_str()).await
+	}
+
 	pub async fn get_cert(self: &Arc<Self>, domain: &str) -> Result<Arc<Cert>> {
 		// First, try locally.
 		{
@@ -196,7 +226,7 @@ pub struct StoreResolver(pub Arc<CertStore>);
 impl rustls::server::ResolvesServerCert for StoreResolver {
 	fn resolve(&self, client_hello: rustls::server::ClientHello<'_>) -> Option<Arc<CertifiedKey>> {
 		let domain = client_hello.server_name()?;
-		let cert = futures::executor::block_on(self.0.get_cert(domain)).ok()?;
+		let cert = self.0.get_cert_for_https(domain).ok()?;
 		Some(cert.certkey.clone())
 	}
 }

src/consul.rs

@@ -95,7 +95,11 @@ impl Consul {
 		Ok(resp.into_iter().map(|n| n.node).collect::<Vec<_>>())
 	}
 
-	pub async fn watch_node(&self, host: &str, idx: Option<usize>) -> Result<(ConsulNodeCatalog, usize)> {
+	pub async fn watch_node(
+		&self,
+		host: &str,
+		idx: Option<usize>,
+	) -> Result<(ConsulNodeCatalog, usize)> {
 		debug!("watch_node {} {:?}", host, idx);
 
 		let url = match idx {

src/http.rs

@@ -1,5 +1,5 @@
-use std::sync::Arc;
 use std::net::SocketAddr;
+use std::sync::Arc;
 
 use anyhow::Result;
 use log::*;

src/https.rs

@@ -5,10 +5,10 @@ use anyhow::Result;
 use log::*;
 
 use futures::FutureExt;
+use http::header::{HeaderName, HeaderValue};
 use hyper::server::conn::Http;
 use hyper::service::service_fn;
 use hyper::{Body, Request, Response, StatusCode};
-use http::header::{HeaderName, HeaderValue};
 use tokio::net::TcpListener;
 use tokio::sync::watch;
 use tokio_rustls::TlsAcceptor;
@@ -121,7 +121,10 @@ async fn handle(
 		let mut response = reverse_proxy::call(remote_addr.ip(), &to_addr, req).await?;
 
 		for (header, value) in proxy_to.add_headers.iter() {
-			response.headers_mut().insert(HeaderName::from_bytes(header.as_bytes())?, HeaderValue::from_str(value)?);
+			response.headers_mut().insert(
+				HeaderName::from_bytes(header.as_bytes())?,
+				HeaderValue::from_str(value)?,
+			);
 		}
 
 		Ok(response)

src/main.rs

@@ -18,11 +18,19 @@ use log::*;
 #[structopt(name = "tricot")]
 struct Opt {
 	/// Address of consul server
-	#[structopt(long = "consul-addr", env = "TRICOT_CONSUL_HOST", default_value = "http://127.0.0.1:8500/")]
+	#[structopt(
+		long = "consul-addr",
+		env = "TRICOT_CONSUL_HOST",
+		default_value = "http://127.0.0.1:8500/"
+	)]
 	pub consul_addr: String,
 
 	/// Prefix of Tricot's entries in Consul KV space
-	#[structopt(long = "consul-kv-prefix", env = "TRICOT_CONSUL_KV_PREFIX", default_value = "tricot/")]
+	#[structopt(
+		long = "consul-kv-prefix",
+		env = "TRICOT_CONSUL_KV_PREFIX",
+		default_value = "tricot/"
+	)]
 	pub consul_kv_prefix: String,
 
 	/// Node name
@@ -30,15 +38,22 @@ struct Opt {
 	pub node_name: String,
 
 	/// Bind address for HTTP server
-	#[structopt(long = "http-bind-addr", env = "TRICOT_HTTP_BIND_ADDR", default_value = "0.0.0.0:80")]
+	#[structopt(
+		long = "http-bind-addr",
+		env = "TRICOT_HTTP_BIND_ADDR",
+		default_value = "0.0.0.0:80"
+	)]
 	pub http_bind_addr: SocketAddr,
 
 	/// Bind address for HTTPS server
-	#[structopt(long = "https-bind-addr", env = "TRICOT_HTTPS_BIND_ADDR", default_value = "0.0.0.0:443")]
+	#[structopt(
+		long = "https-bind-addr",
+		env = "TRICOT_HTTPS_BIND_ADDR",
+		default_value = "0.0.0.0:443"
+	)]
 	pub https_bind_addr: SocketAddr,
 }
 
-
 #[tokio::main(flavor = "multi_thread", worker_threads = 10)]
 async fn main() {
 	if std::env::var("RUST_LOG").is_err() {
@@ -53,16 +68,12 @@ async fn main() {
 	let consul = consul::Consul::new(&opt.consul_addr, &opt.consul_kv_prefix, &opt.node_name);
 	let mut rx_proxy_config = proxy_config::spawn_proxy_config_task(consul.clone());
 
-	let cert_store = cert_store::CertStore::new(consul.clone());
-	tokio::spawn(
-		cert_store
-			.clone()
-			.watch_proxy_config(rx_proxy_config.clone()),
-	);
+	let cert_store = cert_store::CertStore::new(consul.clone(), rx_proxy_config.clone());
+	tokio::spawn(cert_store.clone().watch_proxy_config());
 
 	tokio::spawn(http::serve_http(opt.http_bind_addr, consul.clone()));
 	tokio::spawn(https::serve_https(
-			opt.https_bind_addr,
+		opt.https_bind_addr,
 		cert_store.clone(),
 		rx_proxy_config.clone(),
 	));

src/proxy_config.rs

@@ -1,12 +1,12 @@
+use std::collections::HashMap;
 use std::net::SocketAddr;
 use std::sync::{atomic, Arc};
-use std::collections::HashMap;
 use std::{cmp, time::Duration};
 
 use anyhow::Result;
 
+use futures::future::BoxFuture;
 use futures::stream::{FuturesUnordered, StreamExt};
-use futures::future::{BoxFuture};
 
 use log::*;
 use tokio::{sync::watch, time::sleep};
@@ -45,7 +45,11 @@ fn retry_to_time(retries: u32, max_time: Duration) -> Duration {
 	));
 }
 
-fn parse_tricot_tag(tag: &str, target_addr: SocketAddr, add_headers: &[(String, String)]) -> Option<ProxyEntry> {
+fn parse_tricot_tag(
+	tag: &str,
+	target_addr: SocketAddr,
+	add_headers: &[(String, String)],
+) -> Option<ProxyEntry> {
 	let splits = tag.split(' ').collect::<Vec<_>>();
 	if (splits.len() != 2 && splits.len() != 3) || splits[0] != "tricot" {
 		return None;
@@ -89,10 +93,13 @@ fn parse_consul_catalog(catalog: &ConsulNodeCatalog) -> Vec<ProxyEntry> {
 			_ => match catalog.node.address.parse() {
 				Ok(ip) => ip,
 				_ => {
-					warn!("Could not get address for service {} at node {}", svc.service, catalog.node.node);
+					warn!(
+						"Could not get address for service {} at node {}",
+						svc.service, catalog.node.node
+					);
 					continue;
 				}
-			}
+			},
 		};
 		let addr = SocketAddr::new(ip_addr, svc.port);
 
@@ -124,7 +131,7 @@ pub fn spawn_proxy_config_task(consul: Consul) -> watch::Receiver<Arc<ProxyConfi
 	let (tx, rx) = watch::channel(Arc::new(ProxyConfig {
 		entries: Vec::new(),
 	}));
-	
+
 	let consul = Arc::new(consul);
 
 	tokio::spawn(async move {
@@ -182,7 +189,8 @@ pub fn spawn_proxy_config_task(consul: Consul) -> watch::Receiver<Arc<ProxyConfi
 					watch_state.retries += 1;
 					watch_state.last_idx = None;
 
-					let will_retry_in = retry_to_time(watch_state.retries, Duration::from_secs(600));
+					let will_retry_in =
+						retry_to_time(watch_state.retries, Duration::from_secs(600));
 					error!(
 						"Failed to query consul for node {}. Will retry in {}s. {}",
 						node,