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