src/com/owncloud/android/network/OwnCloudClientUtils.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2011  Bartek Przybylski
   3  *
   4  *   This program is free software: you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation, either version 3 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18 package com.owncloud.android.network;
  19
  20 import java.io.File;
  21 import java.io.FileInputStream;
  22 import java.io.FileOutputStream;
  23 import java.io.IOException;
  24 import java.io.InputStream;
  25 import java.security.GeneralSecurityException;
  26 import java.security.KeyStore;
  27 import java.security.KeyStoreException;
  28 import java.security.NoSuchAlgorithmException;
  29 import java.security.cert.Certificate;
  30 import java.security.cert.CertificateException;
  31
  32 import javax.net.ssl.SSLContext;
  33 import javax.net.ssl.TrustManager;
  34
  35 import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
  36 import org.apache.commons.httpclient.protocol.Protocol;
  37 import org.apache.http.conn.ssl.BrowserCompatHostnameVerifier;
  38 import org.apache.http.conn.ssl.X509HostnameVerifier;
  39
  40 import com.owncloud.android.AccountUtils;
  41 import com.owncloud.android.authenticator.AccountAuthenticator;
  42
  43 import eu.alefzero.webdav.WebdavClient;
  44
  45 import android.accounts.Account;
  46 import android.accounts.AccountManager;
  47 import android.accounts.AccountManagerFuture;
  48 import android.accounts.AuthenticatorException;
  49 import android.accounts.OperationCanceledException;
  50 import android.app.Activity;
  51 import android.content.Context;
  52 import android.net.Uri;
  53 import android.os.Bundle;
  54 import android.util.Log;
  55
  56 public class OwnCloudClientUtils {
  57
  58     final private static String TAG = OwnCloudClientUtils.class.getSimpleName();
  59
  60     /** Default timeout for waiting data from the server */
  61     public static final int DEFAULT_DATA_TIMEOUT = 60000;
  62
  63     /** Default timeout for establishing a connection */
  64     public static final int DEFAULT_CONNECTION_TIMEOUT = 60000;
  65
  66     /** Connection manager for all the WebdavClients */
  67     private static MultiThreadedHttpConnectionManager mConnManager = null;
  68
  69     private static Protocol mDefaultHttpsProtocol = null;
  70
  71     private static AdvancedSslSocketFactory mAdvancedSslSocketFactory = null;
  72
  73     private static X509HostnameVerifier mHostnameVerifier = null;
  74
  75
  76     /**
  77      * Creates a WebdavClient setup for an ownCloud account
  78      *
  79      * Do not call this method from the main thread.
  80      *
  81      * @param account                       The ownCloud account
  82      * @param appContext                    Android application context
  83      * @return                              A WebdavClient object ready to be used
  84      * @throws AuthenticatorException       If the authenticator failed to get the authorization token for the account.
  85      * @throws OperationCanceledException   If the authenticator operation was cancelled while getting the authorization token for the account.
  86      * @throws IOException                  If there was some I/O error while getting the authorization token for the account.
  87      */
  88     public static WebdavClient createOwnCloudClient (Account account, Context appContext) throws OperationCanceledException, AuthenticatorException, IOException {
  89         //Log.d(TAG, "Creating WebdavClient associated to " + account.name);
  90
  91         Uri uri = Uri.parse(AccountUtils.constructFullURLForAccount(appContext, account));
  92         WebdavClient client = createOwnCloudClient(uri, appContext);
  93         AccountManager am = AccountManager.get(appContext);
  94         if (am.getUserData(account, AccountAuthenticator.KEY_SUPPORTS_OAUTH2) != null) {    // TODO avoid a call to getUserData here
  95             String accessToken = am.blockingGetAuthToken(account, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, false);
  96             client.setBearerCredentials(accessToken);   // TODO not assume that the access token is a bearer token
  97
  98         } else {
  99             String username = account.name.substring(0, account.name.lastIndexOf('@'));
 100             //String password = am.getPassword(account);
 101             String password = am.blockingGetAuthToken(account, AccountAuthenticator.AUTH_TOKEN_TYPE_PASSWORD, false);
 102             client.setBasicCredentials(username, password);
 103         }
 104
 105         return client;
 106     }
 107
 108
 109     public static WebdavClient createOwnCloudClient (Account account, Context appContext, Activity currentActivity) throws OperationCanceledException, AuthenticatorException, IOException {
 110         Uri uri = Uri.parse(AccountUtils.constructFullURLForAccount(appContext, account));
 111         WebdavClient client = createOwnCloudClient(uri, appContext);
 112         AccountManager am = AccountManager.get(appContext);
 113         if (am.getUserData(account, AccountAuthenticator.KEY_SUPPORTS_OAUTH2) != null) {    // TODO avoid a call to getUserData here
 114             AccountManagerFuture<Bundle> future =  am.getAuthToken(account, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, null, currentActivity, null, null);
 115             Bundle result = future.getResult();
 116             String accessToken = result.getString(AccountManager.KEY_AUTHTOKEN);
 117             //String accessToken = am.blockingGetAuthToken(account, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, false);
 118             if (accessToken == null) throw new AuthenticatorException("WTF!");
 119             client.setBearerCredentials(accessToken);   // TODO not assume that the access token is a bearer token
 120
 121         } else {
 122             String username = account.name.substring(0, account.name.lastIndexOf('@'));
 123             //String password = am.getPassword(account);
 124             //String password = am.blockingGetAuthToken(account, AccountAuthenticator.AUTH_TOKEN_TYPE_PASSWORD, false);
 125             AccountManagerFuture<Bundle> future =  am.getAuthToken(account, AccountAuthenticator.AUTH_TOKEN_TYPE_PASSWORD, null, currentActivity, null, null);
 126             Bundle result = future.getResult();
 127             String password = result.getString(AccountManager.KEY_AUTHTOKEN);
 128             client.setBasicCredentials(username, password);
 129         }
 130
 131         return client;
 132     }
 133
 134
 135     /**
 136      * Creates a WebdavClient to access a URL and sets the desired parameters for ownCloud client connections.
 137      *
 138      * @param uri       URL to the ownCloud server
 139      * @param context   Android context where the WebdavClient is being created.
 140      * @return          A WebdavClient object ready to be used
 141      */
 142     public static WebdavClient createOwnCloudClient(Uri uri, Context context) {
 143         //Log.d(TAG, "Creating WebdavClient for " + uri);
 144
 145         //allowSelfsignedCertificates(true);
 146         try {
 147             registerAdvancedSslContext(true, context);
 148         }  catch (GeneralSecurityException e) {
 149             Log.e(TAG, "Advanced SSL Context could not be loaded. Default SSL management in the system will be used for HTTPS connections", e);
 150
 151         } catch (IOException e) {
 152             Log.e(TAG, "The local server truststore could not be read. Default SSL management in the system will be used for HTTPS connections", e);
 153         }
 154
 155         WebdavClient client = new WebdavClient(getMultiThreadedConnManager());
 156
 157         client.setDefaultTimeouts(DEFAULT_DATA_TIMEOUT, DEFAULT_CONNECTION_TIMEOUT);
 158         client.setBaseUri(uri);
 159
 160         return client;
 161     }
 162
 163
 164     /**
 165      * Allows or disallows self-signed certificates in ownCloud servers to reach
 166      *
 167      * @param allow     'True' to allow, 'false' to disallow
 168      */
 169     public static void allowSelfsignedCertificates(boolean allow) {
 170         Protocol pr = null;
 171         try {
 172             pr = Protocol.getProtocol("https");
 173             if (pr != null && mDefaultHttpsProtocol == null) {
 174                 mDefaultHttpsProtocol = pr;
 175             }
 176         } catch (IllegalStateException e) {
 177             // nothing to do here; really
 178         }
 179         boolean isAllowed = (pr != null && pr.getSocketFactory() instanceof EasySSLSocketFactory);
 180         if (allow && !isAllowed) {
 181             Protocol.registerProtocol("https", new Protocol("https", new EasySSLSocketFactory(), 443));
 182         } else if (!allow && isAllowed) {
 183                 if (mDefaultHttpsProtocol != null) {
 184                         Protocol.registerProtocol("https", mDefaultHttpsProtocol);
 185                 }
 186         }
 187     }
 188
 189
 190     /**
 191      * Registers or unregisters the proper components for advanced SSL handling.
 192      * @throws IOException
 193      */
 194     private static void registerAdvancedSslContext(boolean register, Context context) throws GeneralSecurityException, IOException {
 195         Protocol pr = null;
 196         try {
 197             pr = Protocol.getProtocol("https");
 198             if (pr != null && mDefaultHttpsProtocol == null) {
 199                 mDefaultHttpsProtocol = pr;
 200             }
 201         } catch (IllegalStateException e) {
 202             // nothing to do here; really
 203         }
 204         boolean isRegistered = (pr != null && pr.getSocketFactory() instanceof AdvancedSslSocketFactory);
 205         if (register && !isRegistered) {
 206             Protocol.registerProtocol("https", new Protocol("https", getAdvancedSslSocketFactory(context), 443));
 207
 208         } else if (!register && isRegistered) {
 209             if (mDefaultHttpsProtocol != null) {
 210                 Protocol.registerProtocol("https", mDefaultHttpsProtocol);
 211             }
 212         }
 213     }
 214
 215     public static AdvancedSslSocketFactory getAdvancedSslSocketFactory(Context context) throws GeneralSecurityException, IOException {
 216         if (mAdvancedSslSocketFactory  == null) {
 217             KeyStore trustStore = getKnownServersStore(context);
 218             AdvancedX509TrustManager trustMgr = new AdvancedX509TrustManager(trustStore);
 219             TrustManager[] tms = new TrustManager[] { trustMgr };
 220
 221             SSLContext sslContext = SSLContext.getInstance("TLS");
 222             sslContext.init(null, tms, null);
 223
 224             mHostnameVerifier = new BrowserCompatHostnameVerifier();
 225             mAdvancedSslSocketFactory = new AdvancedSslSocketFactory(sslContext, trustMgr, mHostnameVerifier);
 226         }
 227         return mAdvancedSslSocketFactory;
 228     }
 229
 230
 231     private static String LOCAL_TRUSTSTORE_FILENAME = "knownServers.bks";
 232
 233     private static String LOCAL_TRUSTSTORE_PASSWORD = "password";
 234
 235     private static KeyStore mKnownServersStore = null;
 236
 237     /**
 238      * Returns the local store of reliable server certificates, explicitly accepted by the user.
 239      *
 240      * Returns a KeyStore instance with empty content if the local store was never created.
 241      *
 242      * Loads the store from the storage environment if needed.
 243      *
 244      * @param context                       Android context where the operation is being performed.
 245      * @return                              KeyStore instance with explicitly-accepted server certificates.
 246      * @throws KeyStoreException            When the KeyStore instance could not be created.
 247      * @throws IOException                  When an existing local trust store could not be loaded.
 248      * @throws NoSuchAlgorithmException     When the existing local trust store was saved with an unsupported algorithm.
 249      * @throws CertificateException         When an exception occurred while loading the certificates from the local trust store.
 250      */
 251     private static KeyStore getKnownServersStore(Context context) throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException {
 252         if (mKnownServersStore == null) {
 253             //mKnownServersStore = KeyStore.getInstance("BKS");
 254             mKnownServersStore = KeyStore.getInstance(KeyStore.getDefaultType());
 255             File localTrustStoreFile = new File(context.getFilesDir(), LOCAL_TRUSTSTORE_FILENAME);
 256             Log.d(TAG, "Searching known-servers store at " + localTrustStoreFile.getAbsolutePath());
 257             if (localTrustStoreFile.exists()) {
 258                 InputStream in = new FileInputStream(localTrustStoreFile);
 259                 try {
 260                     mKnownServersStore.load(in, LOCAL_TRUSTSTORE_PASSWORD.toCharArray());
 261                 } finally {
 262                     in.close();
 263                 }
 264             } else {
 265                 mKnownServersStore.load(null, LOCAL_TRUSTSTORE_PASSWORD.toCharArray()); // necessary to initialize an empty KeyStore instance
 266             }
 267         }
 268         return mKnownServersStore;
 269     }
 270
 271
 272     public static void addCertToKnownServersStore(Certificate cert, Context context) throws  KeyStoreException, NoSuchAlgorithmException,
 273                                                                                             CertificateException, IOException {
 274         KeyStore knownServers = getKnownServersStore(context);
 275         knownServers.setCertificateEntry(Integer.toString(cert.hashCode()), cert);
 276         FileOutputStream fos = null;
 277         try {
 278             fos = context.openFileOutput(LOCAL_TRUSTSTORE_FILENAME, Context.MODE_PRIVATE);
 279             knownServers.store(fos, LOCAL_TRUSTSTORE_PASSWORD.toCharArray());
 280         } finally {
 281             fos.close();
 282         }
 283     }
 284
 285
 286     static private MultiThreadedHttpConnectionManager getMultiThreadedConnManager() {
 287         if (mConnManager == null) {
 288             mConnManager = new MultiThreadedHttpConnectionManager();
 289             mConnManager.getParams().setDefaultMaxConnectionsPerHost(5);
 290             mConnManager.getParams().setMaxTotalConnections(5);
 291         }
 292         return mConnManager;
 293     }
 294
 295
 296 }