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POAndroid: HTTPS (SSL) connection using HttpsURLConnection
 

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  1. POAndroid: HTTPS (SSL) connection using HttpsURLConnection
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    <p>I have 2 apps, one is a Servlet/Tomcat Server, and the other is an Android app.</p> <p>I want to use HttpURLConnection to send and receive XML between both.</p> <p>Code:</p> <pre><code> private String sendPostRequest(String requeststring) { DataInputStream dis = null; StringBuffer messagebuffer = new StringBuffer(); HttpURLConnection urlConnection = null; try { URL url = new URL(this.getServerURL()); urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setDoOutput(true); urlConnection.setRequestMethod("POST"); OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream()); out.write(requeststring.getBytes()); out.flush(); InputStream in = new BufferedInputStream(urlConnection.getInputStream()); dis = new DataInputStream(in); int ch; long len = urlConnection.getContentLength(); if (len != -1) { for (int i = 0; i &lt; len; i++) if ((ch = dis.read()) != -1) { messagebuffer.append((char) ch); } } else { while ((ch = dis.read()) != -1) messagebuffer.append((char) ch); } dis.close(); } catch (Exception e) { e.printStackTrace(); } finally { urlConnection.disconnect(); } return messagebuffer.toString(); } </code></pre> <p>Now, I need to use SSL to send the XMLs for security.</p> <p>First, I use Java Keytool to generate the .keystore file.</p> <pre><code>Keytool -keygen -alias tomcat -keyalg RSA </code></pre> <p>Then I put the XML Code on server.xml file of Tomcat to use SSL</p> <pre><code>&lt;Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="150" scheme="https" secure="true" keystoreFile="c:/Documents and Settings/MyUser/.keystore" keystorePass="password" clientAuth="false" sslProtocol="TLS" /&gt; </code></pre> <p>Then, I change it the HttpURLConnection for HttpsURLConnection </p> <pre><code> private String sendPostRequest(String requeststring) { DataInputStream dis = null; StringBuffer messagebuffer = new StringBuffer(); HttpURLConnection urlConnection = null; //Conexion por HTTPS HttpsURLConnection urlHttpsConnection = null; try { URL url = new URL(this.getServerURL()); //urlConnection = (HttpURLConnection) url.openConnection(); //Si necesito usar HTTPS if (url.getProtocol().toLowerCase().equals("https")) { trustAllHosts(); //Creo la Conexion urlHttpsConnection = (HttpsURLConnection) url.openConnection(); //Seteo la verificacion para que NO verifique nada!! urlHttpsConnection.setHostnameVerifier(DO_NOT_VERIFY); //Asigno a la otra variable para usar simpre la mism urlConnection = urlHttpsConnection; } else { urlConnection = (HttpURLConnection) url.openConnection(); } //Do the same like up </code></pre> <p>and add a trustAllHosts method to Trust every server (dont check for any certificate)</p> <pre><code>private static void trustAllHosts() { X509TrustManager easyTrustManager = new X509TrustManager() { public void checkClientTrusted( X509Certificate[] chain, String authType) throws CertificateException { // Oh, I am easy! } public void checkServerTrusted( X509Certificate[] chain, String authType) throws CertificateException { // Oh, I am easy! } public X509Certificate[] getAcceptedIssuers() { return null; } }; // Create a trust manager that does not validate certificate chains TrustManager[] trustAllCerts = new TrustManager[] {easyTrustManager}; // Install the all-trusting trust manager try { SSLContext sc = SSLContext.getInstance("TLS"); sc.init(null, trustAllCerts, new java.security.SecureRandom()); HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory()); } catch (Exception e) { e.printStackTrace(); } } </code></pre> <p>Those changes worked very good, but I don´t want to Trust every server. I want to use my keystore file to validate the connection and use SSL in the right way. I read a lot on the internet and made a lot of tests, but I can´t understand what I have to do and how to do it.</p> <p>Can somebody help me?</p> <p>Thank you very much</p> <p>Sorry for my poor english</p> <p>-------------------------UPDATE 2011/08/24-------------------------------------------------</p> <p>Well, I'm still working on this. I made a new method to set the KeyStore, InputStream, etc</p> <p>The method looks like this:</p> <pre><code>private static void trustIFNetServer() { try { TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm()); KeyStore ks = KeyStore.getInstance("BKS"); InputStream in = context.getResources().openRawResource(R.raw.mykeystore); String keyPassword = "password"; ks.load(in, keyPassword.toCharArray()); in.close(); tmf.init(ks); TrustManager[] tms = tmf.getTrustManagers(); SSLContext sc = SSLContext.getInstance("TLS"); sc.init(null, tms, new java.security.SecureRandom()); } catch (Exception e) { e.printStackTrace(); } } </code></pre> <p>First I had a lot of problems with the Key and the Certificate, but now it is working (I think so)</p> <p>My problem right now is a TimeOut Exception. I don´t know why it is generated. I'm think it's something with the data write, but I can't solve yet.</p> <p>Any Idea?</p>
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      1. USJames K Polk
 

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