feat(tls): ssl default options (#128)

* feat(tls): use default sslcontext when ssl is enabled, and allow ssl mapping from properties in rabbitmq

starters/async-rabbit-starter/src/main/java/org/reactivecommons/async/rabbit/RabbitMQSetupUtils.java

@@ -16,6 +16,7 @@
 import org.reactivecommons.async.rabbit.config.ConnectionFactoryProvider;
 import org.reactivecommons.async.rabbit.config.RabbitProperties;
 import org.reactivecommons.async.rabbit.config.props.AsyncProps;
+import org.reactivecommons.async.rabbit.config.spring.RabbitPropertiesBase;
 import org.springframework.boot.context.properties.PropertyMapper;
 import reactor.core.publisher.Mono;
 import reactor.rabbitmq.ChannelPool;
@@ -29,14 +30,50 @@
 import reactor.rabbitmq.Utils;
 import reactor.util.retry.Retry;
 
+import javax.net.ssl.KeyManager;
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.TrustManagerFactory;
+import javax.net.ssl.X509TrustManager;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.KeyManagementException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.security.UnrecoverableKeyException;
+import java.security.cert.CertificateException;
 import java.time.Duration;
+import java.util.Arrays;
 import java.util.logging.Level;
 
 @Log
 @UtilityClass
 public class RabbitMQSetupUtils {
     private static final String LISTENER_TYPE = "listener";
     private static final String SENDER_TYPE = "sender";
+    private static final String DEFAULT_PROTOCOL;
+    public static final int START_INTERVAL = 300;
+    public static final int MAX_BACKOFF_INTERVAL = 3000;
+
+    static {
+        String protocol = "TLSv1.1";
+        try {
+            String[] protocols = SSLContext.getDefault().getSupportedSSLParameters().getProtocols();
+            for (String prot : protocols) {
+                if ("TLSv1.2".equals(prot)) {
+                    protocol = "TLSv1.2";
+                    break;
+                }
+            }
+        } catch (NoSuchAlgorithmException e) {
+            // nothing
+        }
+        DEFAULT_PROTOCOL = protocol;
+    }
 
     @SneakyThrows
     public static ConnectionFactoryProvider connectionFactoryProvider(RabbitProperties properties) {
@@ -48,9 +85,7 @@ public static ConnectionFactoryProvider connectionFactoryProvider(RabbitProperti
         map.from(properties::determinePassword).whenNonNull().to(factory::setPassword);
         map.from(properties::determineVirtualHost).whenNonNull().to(factory::setVirtualHost);
         factory.useNio();
-        if (properties.getSsl() != null && properties.getSsl().isEnabled()) {
-            factory.useSslProtocol();
-        }
+        setUpSSL(factory, properties);
         return () -> factory;
     }
 
@@ -118,9 +153,95 @@ private static Mono<Connection> createConnectionMono(ConnectionFactory factory,
                         log.log(Level.SEVERE, "Error creating connection to RabbitMQ Broker in host" +
                                 factory.getHost() + ". Starting retry process...", err)
                 )
-                .retryWhen(Retry.backoff(Long.MAX_VALUE, Duration.ofMillis(300))
-                        .maxBackoff(Duration.ofMillis(3000)))
+                .retryWhen(Retry.backoff(Long.MAX_VALUE, Duration.ofMillis(START_INTERVAL))
+                        .maxBackoff(Duration.ofMillis(MAX_BACKOFF_INTERVAL)))
                 .cache();
     }
 
+    // SSL based on RabbitConnectionFactoryBean
+    // https://github.com/spring-projects/spring-amqp/blob/main/spring-rabbit/src/main/java/org/springframework/amqp/rabbit/connection/RabbitConnectionFactoryBean.java
+
+    private static void setUpSSL(ConnectionFactory factory, RabbitProperties properties)
+            throws NoSuchAlgorithmException, KeyManagementException, KeyStoreException, UnrecoverableKeyException,
+            CertificateException, IOException {
+        var ssl = properties.getSsl();
+        if (ssl != null && ssl.isEnabled()) {
+            var keyManagers = configureKeyManagers(ssl);
+            var trustManagers = configureTrustManagers(ssl);
+            var secureRandom = SecureRandom.getInstanceStrong();
+
+            if (log.isLoggable(Level.FINE)) {
+                log.fine("Initializing SSLContext with KM: " + Arrays.toString(keyManagers) +
+                        ", TM: " + Arrays.toString(trustManagers) + ", random: " + secureRandom);
+            }
+            var context = createSSLContext(ssl);
+            context.init(keyManagers, trustManagers, secureRandom);
+            factory.useSslProtocol(context);
+
+            logDetails(trustManagers);
+
+            if (ssl.getVerifyHostname()) {
+                factory.enableHostnameVerification();
+            }
+        }
+    }
+
+    private static KeyManager[] configureKeyManagers(RabbitPropertiesBase.Ssl ssl) throws KeyStoreException,
+            IOException,
+            NoSuchAlgorithmException,
+            CertificateException, UnrecoverableKeyException {
+        KeyManager[] keyManagers = null;
+        if (ssl.getKeyStore() != null) {
+            var ks = KeyStore.getInstance(ssl.getKeyStoreType());
+            char[] keyPassphrase = null;
+            if (ssl.getKeyStorePassword() != null) {
+                keyPassphrase = ssl.getKeyStorePassword().toCharArray();
+            }
+            try (var inputStream = new FileInputStream(ssl.getKeyStore())) {
+                ks.load(inputStream, keyPassphrase);
+            }
+            var kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
+            kmf.init(ks, keyPassphrase);
+            keyManagers = kmf.getKeyManagers();
+        }
+        return keyManagers;
+    }
+
+    private static TrustManager[] configureTrustManagers(RabbitPropertiesBase.Ssl ssl)
+            throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException {
+        KeyStore tks = null;
+        if (ssl.getTrustStore() != null) {
+            tks = KeyStore.getInstance(ssl.getTrustStoreType());
+            char[] trustPassphrase = null;
+            if (ssl.getTrustStorePassword() != null) {
+                trustPassphrase = ssl.getTrustStorePassword().toCharArray();
+            }
+            try (InputStream inputStream = new FileInputStream(ssl.getTrustStore())) {
+                tks.load(inputStream, trustPassphrase);
+            }
+        }
+
+        var tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
+        tmf.init(tks);
+        return tmf.getTrustManagers();
+    }
+
+    private static SSLContext createSSLContext(RabbitPropertiesBase.Ssl ssl) throws NoSuchAlgorithmException {
+        return SSLContext.getInstance(ssl.getAlgorithm() != null ? ssl.getAlgorithm() : DEFAULT_PROTOCOL);
+    }
+
+    private static void logDetails(TrustManager[] managers) {
+        var found = false;
+        for (var trustManager : managers) {
+            if (trustManager instanceof X509TrustManager) {
+                found = true;
+                var x509TrustManager = (X509TrustManager) trustManager;
+                log.info("Loaded " + x509TrustManager.getAcceptedIssuers().length + " accepted issuers for rabbitmq");
+            }
+        }
+        if (!found) {
+            log.warning("No X509TrustManager found in the truststore.");
+        }
+    }
+
 }