Self-signed SSL acceptance on Android

I have this functionality in exchangeIt, which connects to Microsoft exchange via WebDav. Here's some code to create an HttpClient which will connect to self signed cert's via SSL:

SchemeRegistry schemeRegistry = new SchemeRegistry();// http schemeschemeRegistry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));// https schemeschemeRegistry.register(new Scheme("https", new EasySSLSocketFactory(), 443));HttpParams params = new BasicHttpParams();params.setParameter(ConnManagerPNames.MAX_TOTAL_CONNECTIONS, 30);params.setParameter(ConnManagerPNames.MAX_CONNECTIONS_PER_ROUTE, new ConnPerRouteBean(30));params.setParameter(HttpProtocolParams.USE_EXPECT_CONTINUE, false);HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);ClientConnectionManager cm = new ThreadSafeClientConnManager(params, schemeRegistry);

The EasySSLSocketFactory is here, and the EasyX509TrustManager is here.

The code for exchangeIt is open source, and hosted on googlecode here, if you have any issues. I'm not actively working on it anymore, but the code should work.

Note that since Android 2.2 the process has changed a bit, so check this to make the code above work.

As EJP correctly commented, "Readers should note that this technique is radically insecure. SSL is not secure unless at least one peer is authenticated. See RFC 2246."

Having said that, here's another way, without any extra classes:

import java.security.SecureRandom;import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import javax.net.ssl.HostnameVerifier;import javax.net.ssl.HttpsURLConnection;import javax.net.ssl.SSLContext;import javax.net.ssl.SSLSession;import javax.net.ssl.X509TrustManager;private void trustEveryone() {    try {        HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier(){                public boolean verify(String hostname, SSLSession session) {                    return true;                }});        SSLContext context = SSLContext.getInstance("TLS");        context.init(null, new X509TrustManager[]{new X509TrustManager(){            public void checkClientTrusted(X509Certificate[] chain,                    String authType) throws CertificateException {}            public void checkServerTrusted(X509Certificate[] chain,                    String authType) throws CertificateException {}            public X509Certificate[] getAcceptedIssuers() {                return new X509Certificate[0];            }}}, new SecureRandom());        HttpsURLConnection.setDefaultSSLSocketFactory(                context.getSocketFactory());    } catch (Exception e) { // should never happen        e.printStackTrace();    }}

I faced this issue yesterday, while migrating our company's RESTful API to HTTPS, but using self-signed SSL certificates.

I've looking everywhere, but all the "correct" marked answers I've found consisted of disabling certificate validation, clearly overriding all the sense of SSL.

I finally came to a solution:

1. Create Local KeyStore

   To enable your app to validate your self-signed certificates, you need to provide a custom keystore with the certificates in a manner that Android can trust your endpoint.

The format for such custom keystores is "BKS" from BouncyCastle, so you need the 1.46 version of BouncyCastleProvider that you can download here.

You also need your self-signed certificate, I will assume it's named self_cert.pem.

Now the command for creating your keystore is:

<!-- language: lang-sh -->    $ keytool -import -v -trustcacerts -alias 0 \    -file *PATH_TO_SELF_CERT.PEM* \    -keystore *PATH_TO_KEYSTORE* \    -storetype BKS \    -provider org.bouncycastle.jce.provider.BouncyCastleProvider \    -providerpath *PATH_TO_bcprov-jdk15on-146.jar* \    -storepass *STOREPASS*

PATH_TO_KEYSTORE points to a file where your keystore will be created. It MUST NOT EXIST.

PATH_TO_bcprov-jdk15on-146.jar.JAR is the path to the downloaded .jar libary.

STOREPASS is your newly created keystore password.

2. Include KeyStore in your Application

Copy your newly created keystore from PATH_TO_KEYSTORE to res/raw/certs.bks (certs.bks is just the file name; you can use whatever name you wish)

Create a key in res/values/strings.xml with

<!-- language: lang-xml -->    <resources>    ...        <string name="store_pass">*STOREPASS*</string>    ...    </resources>

3. Create a this class that inherits DefaultHttpClient

   import android.content.Context;import android.util.Log;import org.apache.http.conn.scheme.PlainSocketFactory;import org.apache.http.conn.scheme.Scheme;import org.apache.http.conn.scheme.SchemeRegistry;import org.apache.http.conn.ssl.SSLSocketFactory;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.params.HttpParams;import java.io.IOException;import java.io.InputStream;import java.security.*;public class MyHttpClient extends DefaultHttpClient {    private static Context appContext = null;    private static HttpParams params = null;    private static SchemeRegistry schmReg = null;    private static Scheme httpsScheme = null;    private static Scheme httpScheme = null;    private static String TAG = "MyHttpClient";    public MyHttpClient(Context myContext) {        appContext = myContext;        if (httpScheme == null || httpsScheme == null) {            httpScheme = new Scheme("http", PlainSocketFactory.getSocketFactory(), 80);            httpsScheme = new Scheme("https", mySSLSocketFactory(), 443);        }        getConnectionManager().getSchemeRegistry().register(httpScheme);        getConnectionManager().getSchemeRegistry().register(httpsScheme);    }    private SSLSocketFactory mySSLSocketFactory() {        SSLSocketFactory ret = null;        try {            final KeyStore ks = KeyStore.getInstance("BKS");            final InputStream inputStream = appContext.getResources().openRawResource(R.raw.certs);            ks.load(inputStream, appContext.getString(R.string.store_pass).toCharArray());            inputStream.close();            ret = new SSLSocketFactory(ks);        } catch (UnrecoverableKeyException ex) {            Log.d(TAG, ex.getMessage());        } catch (KeyStoreException ex) {            Log.d(TAG, ex.getMessage());        } catch (KeyManagementException ex) {            Log.d(TAG, ex.getMessage());        } catch (NoSuchAlgorithmException ex) {            Log.d(TAG, ex.getMessage());        } catch (IOException ex) {            Log.d(TAG, ex.getMessage());        } catch (Exception ex) {            Log.d(TAG, ex.getMessage());        } finally {            return ret;        }    }}

Now simply use an instance of **MyHttpClient** as you would with **DefaultHttpClient** to make your HTTPS queries, and it will use and validate correctly your self-signed SSL certificates.

HttpResponse httpResponse;HttpPost httpQuery = new HttpPost("https://yourserver.com");... set up your query ...MyHttpClient myClient = new MyHttpClient(myContext);try{    httpResponse = myClient.(peticionHttp);    // Check for 200 OK code    if (httpResponse.getStatusLine().getStatusCode() == HttpURLConnection.HTTP_OK) {        ... do whatever you want with your response ...    }}catch (Exception ex){    Log.d("httpError", ex.getMessage());}