Support totally ignoring backend HTTPS certificate stuff

Cargo.toml

@@ -19,7 +19,7 @@ serde_json = "1.0.53"
 tokio = { version = "1.0", default-features = false, features = ["rt", "rt-multi-thread", "io-util", "net", "time", "macros", "sync", "signal", "fs"] }
 bytes = "1"
 acme-micro = "0.12"
-rustls = "0.20"
+rustls = { version =  "0.20", features = [ "dangerous_configuration" ] }
 rustls-pemfile = "0.2"
 chrono = { version = "0.4", features = [ "serde" ] }
 hyper = { version = "0.14", features = [ "full" ] }

Dockerfile

@@ -18,6 +18,6 @@ COPY ./src ./src
 RUN cargo build --release
 
 FROM debian:bullseye-slim
-RUN apt-get update && apt-get install -y libssl1.1 iptables
+RUN apt-get update && apt-get install -y libssl1.1 iptables ca-certificates
 COPY --from=builder /srv/target/release/tricot /usr/local/sbin/tricot
 CMD ["/usr/local/sbin/tricot"]

src/cert_store.rs

@@ -56,8 +56,8 @@ impl CertStore {
 				}
 			}
 
+			debug!("Ensuring we have certs for domains: {:#?}", domains);
 			for dom in domains.iter() {
-				info!("Ensuring we have certs for domains: {:?}", domains);
 				if let Err(e) = self.get_cert(dom).await {
 					warn!("Error get_cert {}: {}", dom, e);
 				}

src/main.rs

@@ -5,6 +5,7 @@ use futures::TryFutureExt;
 use std::net::SocketAddr;
 use structopt::StructOpt;
 
+mod tls_util;
 mod cert;
 mod cert_store;
 mod consul;

src/reverse_proxy.rs

@@ -1,16 +1,23 @@
 //! Copied from https://github.com/felipenoris/hyper-reverse-proxy
 //! See there for original Copyright notice
 
+use std::sync::Arc;
+use std::convert::TryInto;
+use std::time::SystemTime;
+use std::net::IpAddr;
+use std::str::FromStr;
+
 use anyhow::Result;
 use log::*;
-use std::convert::TryInto;
 
 use http::header::HeaderName;
 use hyper::header::{HeaderMap, HeaderValue};
 use hyper::{Body, Client, Request, Response, Uri};
+use rustls::{Certificate, ServerName};
+use rustls::client::{ServerCertVerifier, ServerCertVerified};
 use lazy_static::lazy_static;
-use std::net::IpAddr;
-use std::str::FromStr;
+
+use crate::tls_util::HttpsConnectorFixedDnsname;
 
 fn is_hop_header(name: &str) -> bool {
 	use unicase::Ascii;
@@ -149,12 +156,12 @@ pub async fn call_https(
 
 	trace!("Proxied request (HTTPS): {:?}", proxied_request);
 
-	let https = hyper_rustls::HttpsConnectorBuilder::new()
-		.with_native_roots()
-		.https_only()
-		.enable_http1()
-		.build();
-	let client: Client<_, hyper::Body> = Client::builder().build(https);
+	let tls_config = rustls::client::ClientConfig::builder()
+		.with_safe_defaults()
+		.with_custom_certificate_verifier(Arc::new(DontVerifyServerCert))
+		.with_no_client_auth();
+	let connector = HttpsConnectorFixedDnsname::new(tls_config, "dummy");
+	let client: Client<_, hyper::Body> = Client::builder().build(connector);
 	let response = client.request(proxied_request).await?;
 
 	trace!("Inner response (HTTPS): {:?}", response);
@@ -162,3 +169,21 @@ pub async fn call_https(
 	let proxied_response = create_proxied_response(response);
 	Ok(proxied_response)
 }
+
+struct DontVerifyServerCert;
+
+impl ServerCertVerifier for DontVerifyServerCert {
+	fn verify_server_cert(
+        &self,
+        _end_entity: &Certificate,
+        _intermediates: &[Certificate],
+        _server_name: &ServerName,
+        _scts: &mut dyn Iterator<Item = &[u8]>,
+        _ocsp_response: &[u8],
+        _now: SystemTime
+    ) -> Result<ServerCertVerified, rustls::Error> {
+		Ok(ServerCertVerified::assertion())
+	}
+}
+
+

src/tls_util.rs

@@ -0,0 +1,79 @@
+use core::future::Future;
+use core::task::{Context, Poll};
+use std::convert::TryFrom;
+use std::pin::Pin;
+use std::sync::Arc;
+use std::io;
+
+use futures_util::future::*;
+use rustls::ServerName;
+use hyper::client::connect::Connection;
+use hyper::client::HttpConnector;
+use hyper::service::Service;
+use hyper::Uri;
+use hyper_rustls::MaybeHttpsStream;
+use tokio::io::{AsyncRead, AsyncWrite};
+use tokio_rustls::TlsConnector;
+
+
+#[derive(Clone)]
+pub struct HttpsConnectorFixedDnsname<T> {
+	http: T,
+	tls_config: Arc<rustls::ClientConfig>,
+	fixed_dnsname: &'static str,
+}
+type BoxError = Box<dyn std::error::Error + Send + Sync>;
+impl HttpsConnectorFixedDnsname<HttpConnector> {
+	pub fn new(mut tls_config: rustls::ClientConfig, fixed_dnsname: &'static str) -> Self {
+		let mut http = HttpConnector::new();
+		http.enforce_http(false);
+		tls_config.alpn_protocols = vec![b"h2".to_vec(), b"http/1.1".to_vec()];
+		Self {
+			http,
+			tls_config: Arc::new(tls_config),
+			fixed_dnsname,
+		}
+	}
+}
+impl<T> Service<Uri> for HttpsConnectorFixedDnsname<T>
+where
+	T: Service<Uri>,
+	T::Response: Connection + AsyncRead + AsyncWrite + Send + Unpin + 'static,
+	T::Future: Send + 'static,
+	T::Error: Into<BoxError>,
+{
+	type Response = MaybeHttpsStream<T::Response>;
+	type Error = BoxError;
+	#[allow(clippy::type_complexity)]
+	type Future =
+		Pin<Box<dyn Future<Output = Result<MaybeHttpsStream<T::Response>, BoxError>> + Send>>;
+
+	fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+		match self.http.poll_ready(cx) {
+			Poll::Ready(Ok(())) => Poll::Ready(Ok(())),
+			Poll::Ready(Err(e)) => Poll::Ready(Err(e.into())),
+			Poll::Pending => Poll::Pending,
+		}
+	}
+
+	fn call(&mut self, dst: Uri) -> Self::Future {
+		let is_https = dst.scheme_str() == Some("https");
+		assert!(is_https);
+
+		let cfg = self.tls_config.clone();
+		let connecting_future = self.http.call(dst);
+		let dnsname =
+			ServerName::try_from(self.fixed_dnsname).expect("Invalid fixed dnsname");
+		let f = async move {
+			let tcp = connecting_future.await.map_err(Into::into)?;
+			let connector = TlsConnector::from(cfg);
+			let tls = connector
+				.connect(dnsname, tcp)
+				.await
+				.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
+			Ok(MaybeHttpsStream::Https(tls))
+		};
+		f.boxed()
+	}
+}
+