centralize all the checks in the same place

src/cert_store.rs

@@ -22,12 +22,19 @@ pub struct CertStore {
 	consul: Consul,
 	node_name: String,
 	letsencrypt_email: String,
+
 	certs: RwLock<HashMap<String, Arc<Cert>>>,
 	self_signed_certs: RwLock<HashMap<String, Arc<Cert>>>,
+
 	rx_proxy_config: watch::Receiver<Arc<ProxyConfig>>,
 	tx_need_cert: mpsc::UnboundedSender<String>,
 }
 
+struct ProcessedDomains {
+	static_domains: HashSet<String>,
+	on_demand_domains: Vec<(glob::Pattern, Option<String>)>,
+}
+
 impl CertStore {
 	pub fn new(
 		consul: Consul,
@@ -41,10 +48,10 @@ impl CertStore {
 		let cert_store = Arc::new(Self {
 			consul,
 			node_name,
+			letsencrypt_email,
 			certs: RwLock::new(HashMap::new()),
 			self_signed_certs: RwLock::new(HashMap::new()),
 			rx_proxy_config,
-			letsencrypt_email,
 			tx_need_cert: tx,
 		});
 
@@ -66,57 +73,55 @@ impl CertStore {
 		let mut rx_proxy_config = self.rx_proxy_config.clone();
 
 		let mut t_last_check: HashMap<String, Instant> = HashMap::new();
-
-		// Collect data from proxy config
-		let mut static_domains: HashSet<String> = HashSet::new();
-		let mut on_demand_checks: Vec<(glob::Pattern, Option<String>)> = vec![];
+		let mut proc_domains: Option<ProcessedDomains> = None;
 
 		loop {
-			// Collect domains that need a TLS certificate
-			// either from the proxy configuration (eagerly)
-			// or on reaction to a user request (lazily)
 			let domains = select! {
+				// Refresh some internal states, schedule static_domains for renew
 				res = rx_proxy_config.changed() => {
 					if res.is_err() {
 						bail!("rx_proxy_config closed");
 					}
 
-										on_demand_checks.clear();
+					let mut static_domains: HashSet<String> = HashSet::new();
+					let mut on_demand_domains: Vec<(glob::Pattern, Option<String>)> = vec![];
+
 					let proxy_config: Arc<ProxyConfig> = rx_proxy_config.borrow().clone();
+
 					for ent in proxy_config.entries.iter() {
-												// Eagerly generate certificates for domains that
-												// are not patterns
-												match &ent.url_prefix.host {
-													HostDescription::Hostname(domain) => {
-							if let Some((host, _port)) = domain.split_once(':') {
-																static_domains.insert(host.to_string());
-								//domains.insert(host.to_string());
-							} else {
-																static_domains.insert(domain.clone());
-								//domains.insert(domain.clone());
-							}
+						// Eagerly generate certificates for domains that
+						// are not patterns
+						match &ent.url_prefix.host {
+							HostDescription::Hostname(domain) => {
+								if let Some((host, _port)) = domain.split_once(':') {
+									static_domains.insert(host.to_string());
+								} else {
+									static_domains.insert(domain.clone());
+								}
 							},
-													HostDescription::Pattern(pattern) => {
-														on_demand_checks.push((pattern.clone(), ent.on_demand_tls_ask.clone()));
-													}
-												}
+							HostDescription::Pattern(pattern) => {
+								on_demand_domains.push((pattern.clone(), ent.on_demand_tls_ask.clone()));
+							},
+						}
 					}
 
-										// only static_domains are refreshed
-										static_domains.clone()
+					// only static_domains are refreshed
+					proc_domains = Some(ProcessedDomains { static_domains: static_domains.clone(), on_demand_domains });
+					self.domain_validation(static_domains, proc_domains.as_ref()).await
 				}
+				// renew static and on-demand domains
 				need_cert = rx_need_cert.recv() => {
 					match need_cert {
 						Some(dom) => {
-											let mut candidates: HashSet<String> = HashSet::new();
+							let mut candidates: HashSet<String> = HashSet::new();
 
-														// collect certificates as much as possible
+							// collect certificates as much as possible
 							candidates.insert(dom);
 							while let Ok(dom2) = rx_need_cert.try_recv() {
 								candidates.insert(dom2);
 							}
 
-														self.domain_validation(candidates, &static_domains, on_demand_checks.as_slice()).await
+							self.domain_validation(candidates, proc_domains.as_ref()).await
 						}
 						None => bail!("rx_need_cert closed"),
 					}
@@ -145,28 +150,36 @@ impl CertStore {
 	async fn domain_validation(
 		&self,
 		candidates: HashSet<String>,
-		static_domains: &HashSet<String>,
-		checks: &[(glob::Pattern, Option<String>)],
+		maybe_proc_domains: Option<&ProcessedDomains>,
 	) -> HashSet<String> {
 		let mut domains: HashSet<String> = HashSet::new();
 
+		// Handle initialization
+		let proc_domains = match maybe_proc_domains {
+			None => {
+				warn!("Proxy config is not yet loaded, refusing all certificate generation");
+				return domains;
+			}
+			Some(proc) => proc,
+		};
+
 		// Filter certificates...
-		for candidate in candidates.into_iter() {
+		'outer: for candidate in candidates.into_iter() {
 			// Disallow obvious wrong domains...
 			if !candidate.contains('.') || candidate.ends_with(".local") {
-				warn!("Probably not a publicly accessible domain, skipping (a self-signed certificate will be used)");
+				warn!("{} is probably not a publicly accessible domain, skipping (a self-signed certificate will be used)", candidate);
 				continue;
 			}
 
 			// Try to register domain as a static domain
-			if static_domains.contains(&candidate) {
+			if proc_domains.static_domains.contains(&candidate) {
 				trace!("domain {} validated as static domain", candidate);
 				domains.insert(candidate);
 				continue;
 			}
 
 			// It's not a static domain, maybe an on-demand domain?
-			for (pattern, maybe_check_url) in checks.iter() {
+			for (pattern, maybe_check_url) in proc_domains.on_demand_domains.iter() {
 				// check glob pattern
 				if pattern.matches(&candidate) {
 					// if no check url is set, accept domain as long as it matches the pattern
@@ -178,12 +191,14 @@ impl CertStore {
 								pattern
 							);
 							domains.insert(candidate);
-							break;
+							continue 'outer;
 						}
 						Some(url) => url,
 					};
 
 					// if a check url is set, call it
+					// -- avoid DDoSing a backend
+					tokio::time::sleep(Duration::from_secs(2)).await;
 					match self.on_demand_tls_ask(check_url, &candidate).await {
 						Ok(()) => {
 							trace!(
@@ -193,7 +208,7 @@ impl CertStore {
 								check_url
 							);
 							domains.insert(candidate);
-							break;
+							continue 'outer;
 						}
 						Err(e) => {
 							warn!("domain {} validation refused  on glob pattern {} and on check url {} with error: {}", candidate, pattern, check_url, e);
@@ -201,8 +216,6 @@ impl CertStore {
 					}
 				}
 			}
-			// Avoid DDoSing a backend
-			tokio::time::sleep(Duration::from_secs(2)).await;
 		}
 
 		return domains;
@@ -210,17 +223,6 @@ impl CertStore {
 
 	/// This function is also in charge of the refresh of the domain names
 	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.url_prefix.host.matches(domain))
-		{
-			bail!("Domain {} should not have a TLS certificate.", domain);
-		}
-
 		// Check in local memory if it exists
 		if let Some(cert) = self.certs.read().unwrap().get(domain) {
 			if cert.is_old() {