harrisonlee harrisonlee - 4 months ago 34
Java Question

Trusting all certificates using HttpClient over HTTPS

Recently posted a question regarding the

HttpClient
over Https (found here). I've made some headway, but I've run into new issues. As with my last problem, I can't seem to find an example anywhere that works for me. Basically, I want my client to accept any certificate (because I'm only ever pointing to one server) but I keep getting a
javax.net.ssl.SSLException: Not trusted server certificate exception.


So this is what I have:

public void connect() throws A_WHOLE_BUNCH_OF_EXCEPTIONS {

HttpPost post = new HttpPost(new URI(PROD_URL));
post.setEntity(new StringEntity(BODY));

KeyStore trusted = KeyStore.getInstance("BKS");
trusted.load(null, "".toCharArray());
SSLSocketFactory sslf = new SSLSocketFactory(trusted);
sslf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

SchemeRegistry schemeRegistry = new SchemeRegistry();
schemeRegistry.register(new Scheme ("https", sslf, 443));
SingleClientConnManager cm = new SingleClientConnManager(post.getParams(),
schemeRegistry);

HttpClient client = new DefaultHttpClient(cm, post.getParams());
HttpResponse result = client.execute(post);
}


And here's the error I'm getting:

W/System.err( 901): javax.net.ssl.SSLException: Not trusted server certificate
W/System.err( 901): at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:360)
W/System.err( 901): at org.apache.http.conn.ssl.AbstractVerifier.verify(AbstractVerifier.java:92)
W/System.err( 901): at org.apache.http.conn.ssl.SSLSocketFactory.connectSocket(SSLSocketFactory.java:321)
W/System.err( 901): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:129)
W/System.err( 901): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
W/System.err( 901): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
W/System.err( 901): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:348)
W/System.err( 901): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
W/System.err( 901): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
W/System.err( 901): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
W/System.err( 901): at me.harrisonlee.test.ssl.MainActivity.connect(MainActivity.java:129)
W/System.err( 901): at me.harrisonlee.test.ssl.MainActivity.access$0(MainActivity.java:77)
W/System.err( 901): at me.harrisonlee.test.ssl.MainActivity$2.run(MainActivity.java:49)
W/System.err( 901): Caused by: java.security.cert.CertificateException: java.security.InvalidAlgorithmParameterException: the trust anchors set is empty
W/System.err( 901): at org.apache.harmony.xnet.provider.jsse.TrustManagerImpl.checkServerTrusted(TrustManagerImpl.java:157)
W/System.err( 901): at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:355)
W/System.err( 901): ... 12 more
W/System.err( 901): Caused by: java.security.InvalidAlgorithmParameterException: the trust anchors set is empty
W/System.err( 901): at java.security.cert.PKIXParameters.checkTrustAnchors(PKIXParameters.java:645)
W/System.err( 901): at java.security.cert.PKIXParameters.<init>(PKIXParameters.java:89)
W/System.err( 901): at org.apache.harmony.xnet.provider.jsse.TrustManagerImpl.<init>(TrustManagerImpl.java:89)
W/System.err( 901): at org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl.engineGetTrustManagers(TrustManagerFactoryImpl.java:134)
W/System.err( 901): at javax.net.ssl.TrustManagerFactory.getTrustManagers(TrustManagerFactory.java:226)W/System.err( 901): at org.apache.http.conn.ssl.SSLSocketFactory.createTrustManagers(SSLSocketFactory.java:263)
W/System.err( 901): at org.apache.http.conn.ssl.SSLSocketFactory.<init>(SSLSocketFactory.java:190)
W/System.err( 901): at org.apache.http.conn.ssl.SSLSocketFactory.<init>(SSLSocketFactory.java:216)
W/System.err( 901): at me.harrisonlee.test.ssl.MainActivity.connect(MainActivity.java:107)
W/System.err( 901): ... 2 more

Answer

Note: Do not implement this in production code you are ever going to use on a network you do not entirely trust. Especially anything going over the public internet.

Your question is just what I want to know. After I did some searches, the conclusion is as follows.

In HttpClient way, you should create a custom class from org.apache.http.conn.ssl.SSLSocketFactory, not the one org.apache.http.conn.ssl.SSLSocketFactory itself. Some clues can be found in this post Custom SSL handling stopped working on Android 2.2 FroYo.

An example is like ...

import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.apache.http.conn.ssl.SSLSocketFactory;
public class MySSLSocketFactory extends SSLSocketFactory {
    SSLContext sslContext = SSLContext.getInstance("TLS");

    public MySSLSocketFactory(KeyStore truststore) throws NoSuchAlgorithmException, KeyManagementException, KeyStoreException, UnrecoverableKeyException {
        super(truststore);

        TrustManager tm = new X509TrustManager() {
            public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            }

            public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            }

            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        };

        sslContext.init(null, new TrustManager[] { tm }, null);
    }

    @Override
    public Socket createSocket(Socket socket, String host, int port, boolean autoClose) throws IOException, UnknownHostException {
        return sslContext.getSocketFactory().createSocket(socket, host, port, autoClose);
    }

    @Override
    public Socket createSocket() throws IOException {
        return sslContext.getSocketFactory().createSocket();
    }
}

and use this class while creating instance of HttpClient.

public HttpClient getNewHttpClient() {
    try {
        KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
        trustStore.load(null, null);

        MySSLSocketFactory sf = new MySSLSocketFactory(trustStore);
        sf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, HTTP.UTF_8);

        SchemeRegistry registry = new SchemeRegistry();
        registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
        registry.register(new Scheme("https", sf, 443));

        ClientConnectionManager ccm = new ThreadSafeClientConnManager(params, registry);

        return new DefaultHttpClient(ccm, params);
    } catch (Exception e) {
        return new DefaultHttpClient();
    }
}

BTW, the link below is for someone who is looking for HttpURLConnection solution. Https Connection Android

I have tested the above two kinds of solutions on froyo, and they all work like a charm in my cases. Finally, using HttpURLConnection may face the redirect problems, but this is beyond the topic.

Note: Before you decide to trust all certificates, you probably should know the site full well and won't be harmful of it to end-user.

Indeed, the risk you take should be considered carefully, including the effect of hacker's mock site mentioned in the following comments that I deeply appreciated. In some situation, although it might be hard to take care of all certificates, you'd better know the implicit drawbacks to trust all of them.

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