fix(s2n-tls-hyper): Add proper IPv6 address formatting

bindings/rust/certs/cert_localhost_ipv6.pem

@@ -0,0 +1,23 @@
+-----BEGIN CERTIFICATE-----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+q3zgpwPmUPtPTF3QHH0JC/Kbm7V9S4yVx4Qit7GSPUr9Cgj3MJF6MAZqi29LpgSK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+-----END CERTIFICATE-----

bindings/rust/certs/generate.sh

@@ -12,3 +12,16 @@ openssl req -x509 -newkey rsa:4096 -keyout key_rsa.pem -out cert_rsa.pem -sha256
 # used for TLS 1.3 connections
 echo "generating ec key and cert"
 openssl req -x509 -newkey ec -pkeyopt ec_paramgen_curve:P-256 -keyout key.pem -out cert.pem -sha256 -days 36500 -nodes -subj "/C=US/ST=AZ/L=Tempe/O=Amazon/OU=AmazonWebServices/CN=localhost"
+
+
+# used for testing IPv6. includes the localhost IPv6 address as a SAN.
+echo "generating localhost IPv6 key and cert"
+openssl req -x509 \
+    -newkey rsa:2048 \
+    -keyout key_localhost_ipv6.pem \
+    -out cert_localhost_ipv6.pem \
+    -sha256 \
+    -days 36500 \
+    -nodes \
+    -subj "/C=US/ST=MA/L=Boston/O=Amazon/OU=AmazonWebServices/CN=localhost" \
+    -addext "subjectAltName = IP:0:0:0:0:0:0:0:1"

bindings/rust/certs/key_localhost_ipv6.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+ekYU0LYMZwKBgQDLT68tI3o04ITn+Av2ZkzYmrVDJz/s46g84nylnYUHzFvYyDja
+vgFInS4VZiMoOl13vzPe/9GFmjg6oOJvg3DUFRCip++XFt407IOhvkZ/CWYQWNGf
+hpGMFhccOVuyMCGdMfOPDLM4jpE7uTD03Oxkycp0Cn8/i72J4/l1WleJbwKBgQCE
+QkiezFx+HK2MSdoZFi1hV6YEoSMCWSWPy8hnZ1wJ6XtDIYLiEw6PPR7ZwcNpsYGO
+8K5eaakm8ywd8nNmW8yOT85YM/Hw5ZhgZJ56CBPOYWz5LQ3vY7VygHX/kbC7kTH0
+Jb05PdPFIudOKT2ucN3TjcYgU4b9rr834gSpR1FUaQKBgQC4hCEX1kO/NIlJ1fBz
+kHm0LKQT1ggMDRvQ+M5If7a8BqdvXdFN5V9No3DQseXMB1q3OxxbWtJwYiLOskjI
+F2TC98TE9XnPaMABLB3nLBnPW2DHN5DS6A9ool48fV7nZeSUnuytgLPR3s1FrqEf
+yc2ARE24uiZT4QhFoZY2TG2Vpw==
+-----END PRIVATE KEY-----

bindings/rust/s2n-tls-hyper/src/connector.rs

@@ -118,8 +118,21 @@ where
             return Box::pin(async move { Err(Error::InvalidScheme) });
         }
 
+        // IPv6 addresses are enclosed in square brackets within the host of a URI:
+        // https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2
+        //   IP-literal = "[" ( IPv6address / IPvFuture  ) "]"
+        //
+        // These square brackets aren't part of the domain itself, so they are trimmed off to ensure
+        // that the proper server name is provided to s2n-tls-tokio.
+        let mut domain = req.host().unwrap_or("");
+        if let Some(trimmed) = domain.strip_prefix('[') {
+            if let Some(trimmed) = trimmed.strip_suffix(']') {
+                domain = trimmed;
+            }
+        }
+        let domain = domain.to_owned();
+
         let builder = self.conn_builder.clone();
-        let host = req.host().unwrap_or("").to_owned();
         let call = self.http.call(req);
         Box::pin(async move {
             // `HttpsConnector` wraps an HTTP connector that also implements `Service<Uri>`.
@@ -130,7 +143,7 @@ where
 
             let connector = TlsConnector::new(builder);
             let tls = connector
-                .connect(&host, tcp)
+                .connect(&domain, tcp)
                 .await
                 .map_err(Error::TlsError)?;
 

bindings/rust/s2n-tls-hyper/tests/http.rs

@@ -215,3 +215,52 @@ async fn error_matching() -> Result<(), Box<dyn Error + Send + Sync>> {
     server_task.abort();
     Ok(())
 }
+
+#[tokio::test]
+async fn ipv6() -> Result<(), Box<dyn Error + Send + Sync>> {
+    let config = {
+        // The localhost IPv6 certificate contains ::1 in the SAN extension. s2n-tls will not
+        // successfully validate the certificate unless the sever name is properly formatted, and
+        // matches this identity.
+        let localhost_ipv6_cert: &[u8] = include_bytes!(concat!(
+            env!("CARGO_MANIFEST_DIR"),
+            "/../certs/cert_localhost_ipv6.pem"
+        ));
+        let localhost_ipv6_key: &[u8] = include_bytes!(concat!(
+            env!("CARGO_MANIFEST_DIR"),
+            "/../certs/key_localhost_ipv6.pem"
+        ));
+
+        let mut builder = config::Config::builder();
+        builder.load_pem(localhost_ipv6_cert, localhost_ipv6_key)?;
+        builder.trust_pem(localhost_ipv6_cert)?;
+        builder.build()?
+    };
+
+    // Listen for IPv6 connections.
+    let listener = TcpListener::bind("[::1]:0").await?;
+    let addr = listener.local_addr()?;
+
+    let mut tasks = tokio::task::JoinSet::new();
+    tasks.spawn(serve_echo(listener, config.clone()));
+
+    tasks.spawn(async move {
+        let connector = HttpsConnector::new(config);
+        let client: Client<_, Empty<Bytes>> =
+            Client::builder(TokioExecutor::new()).build(connector);
+
+        // Connect to the localhost IPv6 address. s2n-tls hostname verification should ensure that
+        // the certificate contains the `::1` identity (without square brackets).
+        let uri = Uri::from_str(format!("https://[::1]:{}", addr.port()).as_str())?;
+        let response = client.get(uri).await?;
+        assert_eq!(response.status(), 200);
+
+        Ok(())
+    });
+
+    while let Some(res) = tasks.join_next().await {
+        res.unwrap()?;
+    }
+
+    Ok(())
+}