May 14, 2018

okhttp 3 ssl handshake exception

Dealing with ssl handshake exception in okhttp


javax.net.ssl.SSLHandshakeException: Handshake failed
       at com.android.org.conscrypt.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:374)


Solution


SampleTransferLayerSecurity

/**
 *
 */
package com.belazy.okhttp;

import java.util.ArrayList;
import java.util.List;

import javax.net.ssl.SSLContext;

import okhttp3.ConnectionSpec;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.TlsVersion;

/**
 * @author secure socket layer
 *
 */
public class SampleTransferLayerSecurity {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

OkHttpClient client = new OkHttpClient();
client = SampleTransferLayerSecurity.enableTls12OVersion(client).build();
Response response = client.newCall("httpUrl").execute();

}

public static OkHttpClient.Builder enableTls12OVersion(OkHttpClient okHttpClient) {
OkHttpClient.Builder client = okHttpClient.newBuilder();
try {
SSLContext sc = SSLContext.getInstance("TLSv1.2");
sc.init(null, null, null);
client.sslSocketFactory(new Tls12SocketFactory(sc.getSocketFactory()));
ConnectionSpec connectionSpec = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
.tlsVersions(TlsVersion.TLS_1_2).build();
List<ConnectionSpec> specs = new ArrayList<>();
specs.add(connectionSpec);
specs.add(ConnectionSpec.COMPATIBLE_TLS);
specs.add(ConnectionSpec.CLEARTEXT);
client.connectionSpecs(specs);
} catch (Exception exc) {
exc.printStackTrace();
}
return client;
}

}


Tls12SocketFactory.java

package com.belazy.okhttp;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;

/**
 * Enables TLS v1.2 when creating SSLSockets.
 * <p/>
 * For some reason, android supports TLS v1.2 from API 16, but enables it by
 * default only from API 20.
 * @link https://developer.android.com/reference/javax/net/ssl/SSLSocket.html
 * @see SSLSocketFactory
 */
public class Tls12SocketFactory extends SSLSocketFactory {
    private static final String[] TLS_V12_ONLY = {"TLSv1.2"};

    final SSLSocketFactory delegate;

    public Tls12SocketFactory(SSLSocketFactory base) {
        this.delegate = base;
    }

    @Override
    public String[] getDefaultCipherSuites() {
        return delegate.getDefaultCipherSuites();
    }

    @Override
    public String[] getSupportedCipherSuites() {
        return delegate.getSupportedCipherSuites();
    }

    @Override
    public Socket createSocket(Socket s, String host, int port, boolean autoClose) throws IOException {
        return patch(delegate.createSocket(s, host, port, autoClose));
    }

    @Override
    public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
        return patch(delegate.createSocket(host, port));
    }

    @Override
    public Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException, UnknownHostException {
        return patch(delegate.createSocket(host, port, localHost, localPort));
    }

    @Override
    public Socket createSocket(InetAddress host, int port) throws IOException {
        return patch(delegate.createSocket(host, port));
    }

    @Override
    public Socket createSocket(InetAddress address, int port, InetAddress localAddress, int localPort) throws IOException {
        return patch(delegate.createSocket(address, port, localAddress, localPort));
    }

    private Socket patch(Socket s) {
        if (s instanceof SSLSocket) {
            ((SSLSocket) s).setEnabledProtocols(TLS_V12_ONLY);
        }
        return s;
    }
}


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