How to override the cipherlist sent to the server by Android when using HttpsURLConnection?

Question

During TLS negotiation, clients send a list of supported ciphers to the server, the server picks one, and encryption starts. I want to change this cipherlist sent to the ser

Answer 1

This code worked wonders for an unexpected javax.net.ssl.SSLHandshakeException.

Upgrading to jdk1.8.0_92 and Oracle JCE unlimited strength policy files did not help, and I was unsuccessful trying to apply specific SSLParameters to the HttpsUrlConnection.

In particular, attempting to use HttpsUrlConnection to read https://www.adrbnymellon.com results in the following error:

javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure

This website worked OK prior to about 4/15/2016, and then started failing. I believe the failure is caused by the website discontinuing support for SSLv2Hello and SSLv3 due to the DROWN vulnerability. See this for a great analysis.

Access to the website started working by modifying the code with changes to just 2 constants:

private static final String PREFERRED_CIPHER_SUITE = "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256";
SSLContext context = SSLContext.getInstance("TLSv1.2");

I hope this helps someone else.

Answer 2

This piece of code is a bit raw. please use with care.

public class PreferredCipherSuiteSSLSocketFactory extends SSLSocketFactory {


private static final String PREFERRED_CIPHER_SUITE = "TLS_RSA_WITH_AES_128_CBC_SHA";

private final SSLSocketFactory delegate;

public PreferredCipherSuiteSSLSocketFactory(SSLSocketFactory delegate) {

    this.delegate = delegate;
}

@Override
public String[] getDefaultCipherSuites() {

    return setupPreferredDefaultCipherSuites(this.delegate);
}

@Override
public String[] getSupportedCipherSuites() {

    return setupPreferredSupportedCipherSuites(this.delegate);
}

@Override
public Socket createSocket(String arg0, int arg1) throws IOException,
        UnknownHostException {

    Socket socket = this.delegate.createSocket(arg0, arg1);
    String[] cipherSuites = setupPreferredDefaultCipherSuites(delegate);
    ((SSLSocket)socket).setEnabledCipherSuites(cipherSuites);

    return socket;
}

@Override
public Socket createSocket(InetAddress arg0, int arg1) throws IOException {

    Socket socket = this.delegate.createSocket(arg0, arg1);
    String[] cipherSuites = setupPreferredDefaultCipherSuites(delegate);
    ((SSLSocket)socket).setEnabledCipherSuites(cipherSuites);

    return socket;
}

@Override
public Socket createSocket(Socket arg0, String arg1, int arg2, boolean arg3)
        throws IOException {

    Socket socket = this.delegate.createSocket(arg0, arg1, arg2, arg3);
    String[] cipherSuites = setupPreferredDefaultCipherSuites(delegate);
    ((SSLSocket)socket).setEnabledCipherSuites(cipherSuites);

    return socket;
}

@Override
public Socket createSocket(String arg0, int arg1, InetAddress arg2, int arg3)
        throws IOException, UnknownHostException {

    Socket socket = this.delegate.createSocket(arg0, arg1, arg2, arg3);
    String[] cipherSuites = setupPreferredDefaultCipherSuites(delegate);
    ((SSLSocket)socket).setEnabledCipherSuites(cipherSuites);

    return socket;
}

@Override
public Socket createSocket(InetAddress arg0, int arg1, InetAddress arg2,
        int arg3) throws IOException {

    Socket socket = this.delegate.createSocket(arg0, arg1, arg2, arg3);
    String[] cipherSuites = setupPreferredDefaultCipherSuites(delegate);
    ((SSLSocket)socket).setEnabledCipherSuites(cipherSuites);

    return socket;
}

private static String[] setupPreferredDefaultCipherSuites(SSLSocketFactory sslSocketFactory) {

    String[] defaultCipherSuites = sslSocketFactory.getDefaultCipherSuites();

    ArrayList<String> suitesList = new ArrayList<String>(Arrays.asList(defaultCipherSuites));
    suitesList.remove(PREFERRED_CIPHER_SUITE);
    suitesList.add(0, PREFERRED_CIPHER_SUITE);

    return suitesList.toArray(new String[suitesList.size()]);
}

private static String[] setupPreferredSupportedCipherSuites(SSLSocketFactory sslSocketFactory) {

    String[] supportedCipherSuites = sslSocketFactory.getSupportedCipherSuites();

    ArrayList<String> suitesList = new ArrayList<String>(Arrays.asList(supportedCipherSuites));
    suitesList.remove(PREFERRED_CIPHER_SUITE);
    suitesList.add(0, PREFERRED_CIPHER_SUITE);

    return suitesList.toArray(new String[suitesList.size()]);
}
}

When you want to use it.

            HttpsURLConnection connection = (HttpsURLConnection) (new URL(url))
                .openConnection();
        SSLContext context = SSLContext.getInstance("TLS");
        TrustManager tm[] = {new SSLPinningTrustManager()};
        context.init(null, tm, null);
        SSLSocketFactory preferredCipherSuiteSSLSocketFactory = new PreferredCipherSuiteSSLSocketFactory(context.getSocketFactory());
        connection.setSSLSocketFactory(preferredCipherSuiteSSLSocketFactory);
                    connection.connect();

Thanks you.

Answer 3

I bundled the technique in @ThinkChris's answer1 into a dead simple method call. You can use the NetCipher library to get a modern TLS config when using Android's HttpsURLConnection. NetCipher configures the HttpsURLConnection instance to use the best supported TLS version, removes SSLv3 support, and configures the best suite of ciphers for that TLS version. First, add it to your build.gradle:

compile 'info.guardianproject.netcipher:netcipher:1.2'

Or you can download the netcipher-1.2.jar and include it directly in your app. Then instead of calling:

HttpURLConnection connection = (HttpURLConnection) sourceUrl.openConnection();

Call this:

HttpsURLConnection connection = NetCipher.getHttpsURLConnection(sourceUrl);

If you want to specifically customize that cipher list, you can check the code there. But most people should not have to think about the cipher list, instead it should use the common best practices by default.