Connect Android device via MQTT using ssl

Question

Connect Android device via MQTT using ssl

I created an MQTT broker and client in java. It works fine using SSL. With a broker server and client written in java using paho libs, enabling SSL is very simple. We just need to run the protocol in the url from tcp to ssl IE: ssl: //.messaging.internetofthings.ibmcloud.com: 8883 and set some details in the src code:

java.util.Properties sslClientProps = new java.util.Properties();
sslClientProps.setProperty("com.ibm.ssl.protocol", "TLSv1.2");
options.setSSLProperties(sslClientProps);

in SSLContext

SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
sslContext.init(null, null, null);

Then a secure and encrypted connection is created (sniffing packets using WireShark is checked).

Using a special trusted CA certificate also works well (messaging.pem file)

CertificateFactory cf = CertificateFactory.getInstance("X.509");
InputStream certFile = MqttHandler.class.getResourceAsStream("messaging.pem");
Certificate ca = cf.generateCertificate(certFile);
KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.load(null, null);
keyStore.setCertificateEntry("ca", ca);
TrustManager trustManager = TrustManagerUtils.getDefaultTrustManager(keyStore);
SSLContext sslContext = SSLContextUtils.createSSLContext("TLSv1.2", null, trustManager);
options.setSocketFactory(sslContext.getSocketFactory());

I need to use the Android client and the custom MQTT Java Server Broker (without SSL, publishing and subscribing MQTT works well with Android).

SSLSocketFactory Android.

:

1) SSL ( src java-, )

2) CA Android ( src java-, )

3) BouncyCastle ( Android), http://rijware.com/accessing-a-secure-mqtt-broker-with-android/ Android-:

CertificateFactory cf = CertificateFactory.getInstance("X.509");
InputStream keyStoreFile = getAssets().open("raw_key_file");
//keystore trusted
KeyStore keystoreTrust = KeyStore.getInstance("BKS");//Bouncy Castle format for Android
keystoreTrust.load(keyStoreFile, "mykeystorepassword".toCharArray());
TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
trustManagerFactory.init(keystoreTrust);
SLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom());
options.setSocketFactory(sslContext.getSocketFactory());

4) (CA) :

// use local trust store (CA)
TrustManagerFactory tmf;
CertificateFactory cf = CertificateFactory.getInstance("X.509");
InputStream srvIn = getAssets().open("messaging.pem");
Certificate ca = cf.generateCertificate(srvIn);
KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.load(null, null);
keyStore.setCertificateEntry("ca", ca);
tmf = TrustManagerFactory.getInstance("X509");
tmf.init(keyStore);
// load client certificate
KeyStore clientKeyStore = null;
InputStream clIn = getAssets().open("raw_key_file");
clientKeyStore = KeyStore.getInstance("BKS");
clientKeyStore.load(clIn, "mykeystorepassword".toCharArray());
KeyManagerFactory kmf = KeyManagerFactory.getInstance("X509");
kmf.init(clientKeyStore, "mykeystorepassword".toCharArray());
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
options.setSocketFactory(sslContext.getSocketFactory());

, : MqttException (0) - javax.net.ssl.SSLException:

MqttException (0) - javax.net.ssl.SSLException: Connection closed by peer
at org.eclipse.paho.client.mqttv3.internal.ExceptionHelper.createMqttException(ExceptionHelper.java:38)
org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:604)
at java.lang.Thread.run(Thread.java:841)
Caused by: javax.net.ssl.SSLException: Connection closed by peer
at com.android.org.conscrypt.NativeCrypto.SSL_do_handshake(Native Method)
at com.android.org.conscrypt.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:405)
at org.eclipse.paho.client.mqttv3.internal.SSLNetworkModule.start(SSLNetworkModule.java:89)
at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:590)