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.owncloud.android.lib.common.network.NetworkUtils;
  28 import com.actionbarsherlock.app.SherlockFragmentActivity;
  29 import com.owncloud.android.ui.dialog.SslUntrustedCertDialogABSTRACT;
  30 import com.owncloud.android.utils.Log_OC;
  31
  32 import android.content.Context;
  33 import android.graphics.Bitmap;
  34 import android.net.http.SslCertificate;
  35 import android.net.http.SslError;
  36 import android.os.Bundle;
  37 import android.os.Handler;
  38 import android.os.Message;
  39 import android.support.v4.app.FragmentManager;
  40 import android.support.v4.app.FragmentTransaction;
  41 import android.view.KeyEvent;
  42 import android.view.View;
  43 import android.webkit.CookieManager;
  44 import android.webkit.HttpAuthHandler;
  45 import android.webkit.SslErrorHandler;
  46 import android.webkit.WebResourceResponse;
  47 import android.webkit.WebView;
  48 import android.webkit.WebViewClient;
  49
  50
  51 /**
  52  * Custom {@link WebViewClient} client aimed to catch the end of a single-sign-on process
  53  * running in the {@link WebView} that is attached to.
  54  *
  55  * Assumes that the single-sign-on is kept thanks to a cookie set at the end of the
  56  * authentication process.
  57  *
  58  * @author David A. Velasco
  59  */
  60 public class SsoWebViewClient extends WebViewClient {
  61
  62     private static final String TAG = SsoWebViewClient.class.getSimpleName();
  63
  64     public interface SsoWebViewClientListener {
  65         public void onSsoFinished(String sessionCookie);
  66     }
  67
  68     private Context mContext;
  69     private Handler mListenerHandler;
  70     private WeakReference<SsoWebViewClientListener> mListenerRef;
  71     private String mTargetUrl;
  72     private String mLastReloadedUrlAtError;
  73
  74     public SsoWebViewClient (Context context, Handler listenerHandler, SsoWebViewClientListener listener) {
  75         mContext = context;
  76         mListenerHandler = listenerHandler;
  77         mListenerRef = new WeakReference<SsoWebViewClient.SsoWebViewClientListener>(listener);
  78         mTargetUrl = "fake://url.to.be.set";
  79         mLastReloadedUrlAtError = null;
  80     }
  81
  82     public String getTargetUrl() {
  83         return mTargetUrl;
  84     }
  85
  86     public void setTargetUrl(String targetUrl) {
  87         mTargetUrl = targetUrl;
  88     }
  89
  90     @Override
  91     public void onPageStarted (WebView view, String url, Bitmap favicon) {
  92         Log_OC.d(TAG, "onPageStarted : " + url);
  93         super.onPageStarted(view, url, favicon);
  94     }
  95
  96     @Override
  97     public void onFormResubmission (WebView view, Message dontResend, Message resend) {
  98         Log_OC.d(TAG, "onFormResubMission ");
  99
 100         // necessary to grant reload of last page when device orientation is changed after sending a form
 101         resend.sendToTarget();
 102     }
 103
 104     @Override
 105     public boolean shouldOverrideUrlLoading(WebView view, String url) {
 106         return false;
 107     }
 108
 109     @Override
 110     public void onReceivedError (WebView view, int errorCode, String description, String failingUrl) {
 111         Log_OC.e(TAG, "onReceivedError : " + failingUrl + ", code " + errorCode + ", description: " + description);
 112         if (!failingUrl.equals(mLastReloadedUrlAtError)) {
 113             view.reload();
 114             mLastReloadedUrlAtError = failingUrl;
 115         } else {
 116             mLastReloadedUrlAtError = null;
 117             super.onReceivedError(view, errorCode, description, failingUrl);
 118         }
 119     }
 120
 121     @Override
 122     public void onPageFinished (WebView view, String url) {
 123         Log_OC.d(TAG, "onPageFinished : " + url);
 124         mLastReloadedUrlAtError = null;
 125         if (url.startsWith(mTargetUrl)) {
 126             view.setVisibility(View.GONE);
 127             CookieManager cookieManager = CookieManager.getInstance();
 128             final String cookies = cookieManager.getCookie(url);
 129             Log_OC.d(TAG, "Cookies: " + cookies);
 130             if (mListenerHandler != null && mListenerRef != null) {
 131                 // this is good idea because onPageFinished is not running in the UI thread
 132                 mListenerHandler.post(new Runnable() {
 133                     @Override
 134                     public void run() {
 135                         SsoWebViewClientListener listener = mListenerRef.get();
 136                         if (listener != null) {
 137                                 // Send Cookies to the listener
 138                             listener.onSsoFinished(cookies);
 139                         }
 140                     }
 141                 });
 142             }
 143         }
 144     }
 145
 146
 147     @Override
 148     public void doUpdateVisitedHistory (WebView view, String url, boolean isReload) {
 149         Log_OC.d(TAG, "doUpdateVisitedHistory : " + url);
 150     }
 151
 152     @Override
 153     public void onReceivedSslError (final WebView view, final SslErrorHandler handler, SslError error) {
 154         Log_OC.d(TAG, "onReceivedSslError : " + error);
 155         // Test 1
 156         X509Certificate x509Certificate = getX509CertificateFromError(error);
 157         boolean isKnownServer = false;
 158
 159         if (x509Certificate != null) {
 160             Log_OC.d(TAG, "------>>>>> x509Certificate " + x509Certificate.toString());
 161
 162             try {
 163                 isKnownServer = NetworkUtils.isCertInKnownServersStore((Certificate) x509Certificate, mContext);
 164             } catch (Exception e) {
 165                 Log_OC.e(TAG, "Exception: " + e.getMessage());
 166             }
 167         }
 168
 169          if (isKnownServer) {
 170              handler.proceed();
 171          } else if (x509Certificate != null) {
 172              // Show a dialog with the certificate info
 173              ((AuthenticatorActivity)mContext).showUntrustedCertDialog(x509Certificate, error);
 174              handler.cancel();
 175          } else {
 176              // Show a dialog with the certificate information available in SslError (not full)
 177              SslUntrustedCertDialogABSTRACT dialog = SslUntrustedCertDialogABSTRACT.newInstanceForEmptySslError(error, handler);
 178              FragmentManager fm = ((SherlockFragmentActivity)mContext).getSupportFragmentManager();
 179              FragmentTransaction ft = fm.beginTransaction();
 180              dialog.show(ft, AuthenticatorActivity.DIALOG_UNTRUSTED_CERT);
 181              // let's forward the handler, and see what happens...
 182          }
 183     }
 184
 185     /**
 186      * Obtain the X509Certificate from SslError
 187      * @param   error     SslError
 188      * @return  X509Certificate from error
 189      */
 190     public X509Certificate getX509CertificateFromError (SslError error) {
 191         Bundle bundle = SslCertificate.saveState(error.getCertificate());
 192         X509Certificate x509Certificate;
 193         byte[] bytes = bundle.getByteArray("x509-certificate");
 194         if (bytes == null) {
 195             x509Certificate = null;
 196         } else {
 197             try {
 198                 CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
 199                 Certificate cert = certFactory.generateCertificate(new ByteArrayInputStream(bytes));
 200                 x509Certificate = (X509Certificate) cert;
 201             } catch (CertificateException e) {
 202                 x509Certificate = null;
 203             }
 204         }
 205         return x509Certificate;
 206     }
 207
 208     @Override
 209     public void onReceivedHttpAuthRequest (WebView view, HttpAuthHandler handler, String host, String realm) {
 210         Log_OC.d(TAG, "onReceivedHttpAuthRequest : " + host);
 211     }
 212
 213     @Override
 214     public WebResourceResponse shouldInterceptRequest (WebView view, String url) {
 215         Log_OC.d(TAG, "shouldInterceptRequest : " + url);
 216         return null;
 217     }
 218
 219     @Override
 220     public void onLoadResource (WebView view, String url) {
 221         Log_OC.d(TAG, "onLoadResource : " + url);
 222     }
 223
 224     @Override
 225     public void onReceivedLoginRequest (WebView view, String realm, String account, String args) {
 226         Log_OC.d(TAG, "onReceivedLoginRequest : " + realm + ", " + account + ", " + args);
 227     }
 228
 229     @Override
 230     public void onScaleChanged (WebView view, float oldScale, float newScale) {
 231         Log_OC.d(TAG, "onScaleChanged : " + oldScale + " -> " + newScale);
 232         super.onScaleChanged(view, oldScale, newScale);
 233     }
 234
 235     @Override
 236     public void onUnhandledKeyEvent (WebView view, KeyEvent event) {
 237         Log_OC.d(TAG, "onUnhandledKeyEvent : " + event);
 238     }
 239
 240     @Override
 241     public boolean shouldOverrideKeyEvent (WebView view, KeyEvent event) {
 242         Log_OC.d(TAG, "shouldOverrideKeyEvent : " + event);
 243         return false;
 244     }
 245
 246 }