com.cerema.cloud2.lib.common.network.NetworkUtils.java Source code

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/* ownCloud Android Library is available under MIT license
 *   Copyright (C) 2015 ownCloud Inc.
 *   
 *   Permission is hereby granted, free of charge, to any person obtaining a copy
 *   of this software and associated documentation files (the "Software"), to deal
 *   in the Software without restriction, including without limitation the rights
 *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *   copies of the Software, and to permit persons to whom the Software is
 *   furnished to do so, subject to the following conditions:
 *   
 *   The above copyright notice and this permission notice shall be included in
 *   all copies or substantial portions of the Software.
 *   
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
 *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
 *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
 *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *   THE SOFTWARE.
 *
 */

package com.cerema.cloud2.lib.common.network;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;

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

import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import org.apache.commons.httpclient.protocol.Protocol;
import org.apache.http.conn.ssl.BrowserCompatHostnameVerifier;
import org.apache.http.conn.ssl.X509HostnameVerifier;

import android.content.Context;

import com.cerema.cloud2.lib.common.utils.Log_OC;

public class NetworkUtils {

    final private static String TAG = NetworkUtils.class.getSimpleName();

    /** Default timeout for waiting data from the server */
    public static final int DEFAULT_DATA_TIMEOUT = 60000;

    /** Default timeout for establishing a connection */
    public static final int DEFAULT_CONNECTION_TIMEOUT = 60000;

    /** Standard name for protocol TLS version 1.2 in Java Secure Socket Extension (JSSE) API */
    public static final String PROTOCOL_TLSv1_2 = "TLSv1.2";

    /** Standard name for protocol TLS version 1.0 in JSSE API */
    public static final String PROTOCOL_TLSv1_0 = "TLSv1";

    /** Connection manager for all the OwnCloudClients */
    private static MultiThreadedHttpConnectionManager mConnManager = null;

    private static Protocol mDefaultHttpsProtocol = null;

    private static AdvancedSslSocketFactory mAdvancedSslSocketFactory = null;

    private static X509HostnameVerifier mHostnameVerifier = null;

    /**
     * Registers or unregisters the proper components for advanced SSL handling.
     * @throws IOException 
     */
    @SuppressWarnings("deprecation")
    public static void registerAdvancedSslContext(boolean register, Context context)
            throws GeneralSecurityException, IOException {
        Protocol pr = null;
        try {
            pr = Protocol.getProtocol("https");
            if (pr != null && mDefaultHttpsProtocol == null) {
                mDefaultHttpsProtocol = pr;
            }
        } catch (IllegalStateException e) {
            // nothing to do here; really
        }
        boolean isRegistered = (pr != null && pr.getSocketFactory() instanceof AdvancedSslSocketFactory);
        if (register && !isRegistered) {
            Protocol.registerProtocol("https", new Protocol("https", getAdvancedSslSocketFactory(context), 443));

        } else if (!register && isRegistered) {
            if (mDefaultHttpsProtocol != null) {
                Protocol.registerProtocol("https", mDefaultHttpsProtocol);
            }
        }
    }

    public static AdvancedSslSocketFactory getAdvancedSslSocketFactory(Context context)
            throws GeneralSecurityException, IOException {
        if (mAdvancedSslSocketFactory == null) {
            KeyStore trustStore = getKnownServersStore(context);
            AdvancedX509TrustManager trustMgr = new AdvancedX509TrustManager(trustStore);
            TrustManager[] tms = new TrustManager[] { trustMgr };

            SSLContext sslContext;
            try {
                sslContext = SSLContext.getInstance("TLSv1.2");
            } catch (NoSuchAlgorithmException e) {
                Log_OC.w(TAG, "TLSv1.2 is not supported in this device; falling through TLSv1.0");
                sslContext = SSLContext.getInstance("TLSv1");
                // should be available in any device; see reference of supported protocols in 
                // http://developer.android.com/reference/javax/net/ssl/SSLSocket.html
            }
            sslContext.init(null, tms, null);

            mHostnameVerifier = new BrowserCompatHostnameVerifier();
            mAdvancedSslSocketFactory = new AdvancedSslSocketFactory(sslContext, trustMgr, mHostnameVerifier);
        }
        return mAdvancedSslSocketFactory;
    }

    private static String LOCAL_TRUSTSTORE_FILENAME = "knownServers.bks";

    private static String LOCAL_TRUSTSTORE_PASSWORD = "password";

    private static KeyStore mKnownServersStore = null;

    /**
     * Returns the local store of reliable server certificates, explicitly accepted by the user.
     * 
     * Returns a KeyStore instance with empty content if the local store was never created.
     * 
     * Loads the store from the storage environment if needed.
     * 
     * @param context                       Android context where the operation is being performed.
     * @return                              KeyStore instance with explicitly-accepted server certificates. 
     * @throws KeyStoreException            When the KeyStore instance could not be created.
     * @throws IOException                  When an existing local trust store could not be loaded.
     * @throws NoSuchAlgorithmException     When the existing local trust store was saved with an unsupported algorithm.
     * @throws CertificateException         When an exception occurred while loading the certificates from the local 
     *                               trust store.
     */
    private static KeyStore getKnownServersStore(Context context)
            throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException {
        if (mKnownServersStore == null) {
            //mKnownServersStore = KeyStore.getInstance("BKS");
            mKnownServersStore = KeyStore.getInstance(KeyStore.getDefaultType());
            File localTrustStoreFile = new File(context.getFilesDir(), LOCAL_TRUSTSTORE_FILENAME);
            Log_OC.d(TAG, "Searching known-servers store at " + localTrustStoreFile.getAbsolutePath());
            if (localTrustStoreFile.exists()) {
                InputStream in = new FileInputStream(localTrustStoreFile);
                try {
                    mKnownServersStore.load(in, LOCAL_TRUSTSTORE_PASSWORD.toCharArray());
                } finally {
                    in.close();
                }
            } else {
                // next is necessary to initialize an empty KeyStore instance
                mKnownServersStore.load(null, LOCAL_TRUSTSTORE_PASSWORD.toCharArray());
            }
        }
        return mKnownServersStore;
    }

    public static void addCertToKnownServersStore(Certificate cert, Context context)
            throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException {

        KeyStore knownServers = getKnownServersStore(context);
        knownServers.setCertificateEntry(Integer.toString(cert.hashCode()), cert);
        FileOutputStream fos = null;
        try {
            fos = context.openFileOutput(LOCAL_TRUSTSTORE_FILENAME, Context.MODE_PRIVATE);
            knownServers.store(fos, LOCAL_TRUSTSTORE_PASSWORD.toCharArray());
        } finally {
            fos.close();
        }
    }

    static public MultiThreadedHttpConnectionManager getMultiThreadedConnManager() {
        if (mConnManager == null) {
            mConnManager = new MultiThreadedHttpConnectionManager();
            mConnManager.getParams().setDefaultMaxConnectionsPerHost(5);
            mConnManager.getParams().setMaxTotalConnections(5);
        }
        return mConnManager;
    }

    public static boolean isCertInKnownServersStore(Certificate cert, Context context)
            throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException {

        KeyStore knownServers = getKnownServersStore(context);
        Log_OC.d(TAG, "Certificate - HashCode: " + cert.hashCode() + " "
                + Boolean.toString(knownServers.isCertificateEntry(Integer.toString(cert.hashCode()))));
        return knownServers.isCertificateEntry(Integer.toString(cert.hashCode()));
    }

}