src/com/owncloud/android/authentication/SsoWebViewClient.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012-2013 ownCloud Inc.
   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 version 2,
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  *
  13  *   You should have received a copy of the GNU General Public License
  14  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  */
  17
  18 package com.owncloud.android.authentication;
  19
  20 import java.io.ByteArrayInputStream;
  21 import java.lang.ref.WeakReference;
  22 import java.security.cert.Certificate;
  23 import java.security.cert.CertificateException;
  24 import java.security.cert.CertificateFactory;
  25 import java.security.cert.X509Certificate;
  26
  27 import com.actionbarsherlock.app.SherlockFragmentActivity;
  28 import com.owncloud.android.R;
  29 import com.owncloud.android.lib.common.network.NetworkUtils;
  30 import com.owncloud.android.ui.dialog.SslUntrustedCertDialog;
  31 import com.owncloud.android.ui.dialog.SslUntrustedCertDialogABSTRACT;
  32 import com.owncloud.android.ui.dialog.SslUntrustedCertDialog.OnSslUntrustedCertListener;
  33 import com.owncloud.android.utils.Log_OC;
  34
  35 import android.app.AlertDialog;
  36 import android.content.Context;
  37 import android.content.DialogInterface;
  38 import android.graphics.Bitmap;
  39 import android.net.http.SslCertificate;
  40 import android.net.http.SslError;
  41 import android.os.Bundle;
  42 import android.os.Handler;
  43 import android.os.Message;
  44 import android.support.v4.app.FragmentActivity;
  45 import android.support.v4.app.FragmentManager;
  46 import android.support.v4.app.FragmentTransaction;
  47 import android.view.KeyEvent;
  48 import android.view.View;
  49 import android.webkit.CookieManager;
  50 import android.webkit.HttpAuthHandler;
  51 import android.webkit.SslErrorHandler;
  52 import android.webkit.WebResourceResponse;
  53 import android.webkit.WebView;
  54 import android.webkit.WebViewClient;
  55
  56
  57 /**
  58  * Custom {@link WebViewClient} client aimed to catch the end of a single-sign-on process
  59  * running in the {@link WebView} that is attached to.
  60  *
  61  * Assumes that the single-sign-on is kept thanks to a cookie set at the end of the
  62  * authentication process.
  63  *
  64  * @author David A. Velasco
  65  */
  66 public class SsoWebViewClient extends WebViewClient implements OnSslUntrustedCertListener {
  67
  68     private static final String TAG = SsoWebViewClient.class.getSimpleName();
  69
  70     public final static String DIALOG_UNTRUSTED_CERT = "UNTRUSTED CERT";
  71
  72     public interface SsoWebViewClientListener {
  73         public void onSsoFinished(String sessionCookie);
  74     }
  75
  76     private Context mContext;
  77     private Handler mListenerHandler;
  78     private WeakReference<SsoWebViewClientListener> mListenerRef;
  79     private String mTargetUrl;
  80     private String mLastReloadedUrlAtError;
  81
  82     public SsoWebViewClient (Context context, Handler listenerHandler, SsoWebViewClientListener listener) {
  83         mContext = context;
  84         mListenerHandler = listenerHandler;
  85         mListenerRef = new WeakReference<SsoWebViewClient.SsoWebViewClientListener>(listener);
  86         mTargetUrl = "fake://url.to.be.set";
  87         mLastReloadedUrlAtError = null;
  88     }
  89
  90     public String getTargetUrl() {
  91         return mTargetUrl;
  92     }
  93
  94     public void setTargetUrl(String targetUrl) {
  95         mTargetUrl = targetUrl;
  96     }
  97
  98     @Override
  99     public void onPageStarted (WebView view, String url, Bitmap favicon) {
 100         Log_OC.d(TAG, "onPageStarted : " + url);
 101         super.onPageStarted(view, url, favicon);
 102     }
 103
 104     @Override
 105     public void onFormResubmission (WebView view, Message dontResend, Message resend) {
 106         Log_OC.d(TAG, "onFormResubMission ");
 107
 108         // necessary to grant reload of last page when device orientation is changed after sending a form
 109         resend.sendToTarget();
 110     }
 111
 112     @Override
 113     public boolean shouldOverrideUrlLoading(WebView view, String url) {
 114         return false;
 115     }
 116
 117     @Override
 118     public void onReceivedError (WebView view, int errorCode, String description, String failingUrl) {
 119         Log_OC.e(TAG, "onReceivedError : " + failingUrl + ", code " + errorCode + ", description: " + description);
 120         if (!failingUrl.equals(mLastReloadedUrlAtError)) {
 121             view.reload();
 122             mLastReloadedUrlAtError = failingUrl;
 123         } else {
 124             mLastReloadedUrlAtError = null;
 125             super.onReceivedError(view, errorCode, description, failingUrl);
 126         }
 127     }
 128
 129     @Override
 130     public void onPageFinished (WebView view, String url) {
 131         Log_OC.d(TAG, "onPageFinished : " + url);
 132         mLastReloadedUrlAtError = null;
 133         if (url.startsWith(mTargetUrl)) {
 134             view.setVisibility(View.GONE);
 135             CookieManager cookieManager = CookieManager.getInstance();
 136             final String cookies = cookieManager.getCookie(url);
 137             Log_OC.d(TAG, "Cookies: " + cookies);
 138             if (mListenerHandler != null && mListenerRef != null) {
 139                 // this is good idea because onPageFinished is not running in the UI thread
 140                 mListenerHandler.post(new Runnable() {
 141                     @Override
 142                     public void run() {
 143                         SsoWebViewClientListener listener = mListenerRef.get();
 144                         if (listener != null) {
 145                                 // Send Cookies to the listener
 146                             listener.onSsoFinished(cookies);
 147                         }
 148                     }
 149                 });
 150             }
 151         }
 152     }
 153
 154
 155     @Override
 156     public void doUpdateVisitedHistory (WebView view, String url, boolean isReload) {
 157         Log_OC.d(TAG, "doUpdateVisitedHistory : " + url);
 158     }
 159
 160     @Override
 161     public void onReceivedSslError (final WebView view, final SslErrorHandler handler, SslError error) {
 162         Log_OC.d(TAG, "onReceivedSslError : " + error);
 163         // Test 1
 164         X509Certificate x509Certificate = getX509CertificateFromError(error);
 165         boolean isKnownServer = false;
 166
 167         if (x509Certificate != null) {
 168             Log_OC.d(TAG, "------>>>>> x509Certificate " + x509Certificate.toString());
 169
 170             try {
 171                 isKnownServer = NetworkUtils.isCertInKnownServersStore((Certificate) x509Certificate, mContext);
 172             } catch (Exception e) {
 173                 Log_OC.e(TAG, "Exception: " + e.getMessage());
 174             }
 175         }
 176
 177          if (isKnownServer) {
 178              handler.proceed();
 179          } else if (x509Certificate != null) {
 180              // Show a dialog with all the certificate info
 181              SslUntrustedCertDialog dialog = SslUntrustedCertDialog.newInstance(mContext, x509Certificate, this, handler);
 182              FragmentManager fm = ((SherlockFragmentActivity)mContext).getSupportFragmentManager();
 183              FragmentTransaction ft = fm.beginTransaction();
 184              dialog.show(ft, DIALOG_UNTRUSTED_CERT);
 185              handler.cancel();
 186          } else {
 187              // Show a dialog with the certificate information available in SslError (not full)
 188              SslUntrustedCertDialogABSTRACT dialog = SslUntrustedCertDialogABSTRACT.newInstanceForEmptySslError(error, handler);
 189              FragmentManager fm = ((SherlockFragmentActivity)mContext).getSupportFragmentManager();
 190              FragmentTransaction ft = fm.beginTransaction();
 191              dialog.show(ft, DIALOG_UNTRUSTED_CERT);
 192              // let's forward the handler, and see what happens...
 193          }
 194     }
 195
 196     /**
 197      * Obtain the X509Certificate from SslError
 198      * @param   error     SslError
 199      * @return  X509Certificate from error
 200      */
 201     public X509Certificate getX509CertificateFromError (SslError error) {
 202         Bundle bundle = SslCertificate.saveState(error.getCertificate());
 203         X509Certificate x509Certificate;
 204         byte[] bytes = bundle.getByteArray("x509-certificate");
 205         if (bytes == null) {
 206             x509Certificate = null;
 207         } else {
 208             try {
 209                 CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
 210                 Certificate cert = certFactory.generateCertificate(new ByteArrayInputStream(bytes));
 211                 x509Certificate = (X509Certificate) cert;
 212             } catch (CertificateException e) {
 213                 x509Certificate = null;
 214             }
 215         }
 216         return x509Certificate;
 217     }
 218
 219     @Override
 220     public void onReceivedHttpAuthRequest (WebView view, HttpAuthHandler handler, String host, String realm) {
 221         Log_OC.d(TAG, "onReceivedHttpAuthRequest : " + host);
 222     }
 223
 224     @Override
 225     public WebResourceResponse shouldInterceptRequest (WebView view, String url) {
 226         Log_OC.d(TAG, "shouldInterceptRequest : " + url);
 227         return null;
 228     }
 229
 230     @Override
 231     public void onLoadResource (WebView view, String url) {
 232         Log_OC.d(TAG, "onLoadResource : " + url);
 233     }
 234
 235     @Override
 236     public void onReceivedLoginRequest (WebView view, String realm, String account, String args) {
 237         Log_OC.d(TAG, "onReceivedLoginRequest : " + realm + ", " + account + ", " + args);
 238     }
 239
 240     @Override
 241     public void onScaleChanged (WebView view, float oldScale, float newScale) {
 242         Log_OC.d(TAG, "onScaleChanged : " + oldScale + " -> " + newScale);
 243         super.onScaleChanged(view, oldScale, newScale);
 244     }
 245
 246     @Override
 247     public void onUnhandledKeyEvent (WebView view, KeyEvent event) {
 248         Log_OC.d(TAG, "onUnhandledKeyEvent : " + event);
 249     }
 250
 251     @Override
 252     public boolean shouldOverrideKeyEvent (WebView view, KeyEvent event) {
 253         Log_OC.d(TAG, "shouldOverrideKeyEvent : " + event);
 254         return false;
 255     }
 256
 257     @Override
 258     public void onFailedSavingCertificate() {
 259         AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
 260         builder.setMessage(mContext.getString(R.string.ssl_validator_not_saved));
 261         builder.setCancelable(false);
 262         builder.setPositiveButton(R.string.common_ok, new DialogInterface.OnClickListener() {
 263             @Override
 264             public void onClick(DialogInterface dialog, int which) {
 265                 dialog.dismiss();
 266             };
 267         });
 268         builder.create().show();
 269
 270     }
 271
 272 }