1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.captiveportallogin; 18 19 import android.app.Activity; 20 import android.app.LoadedApk; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.graphics.Bitmap; 24 import android.net.CaptivePortal; 25 import android.net.ConnectivityManager; 26 import android.net.ConnectivityManager.NetworkCallback; 27 import android.net.Network; 28 import android.net.NetworkCapabilities; 29 import android.net.NetworkRequest; 30 import android.net.Proxy; 31 import android.net.Uri; 32 import android.net.http.SslError; 33 import android.os.Bundle; 34 import android.provider.Settings; 35 import android.util.ArrayMap; 36 import android.util.Log; 37 import android.util.TypedValue; 38 import android.view.Menu; 39 import android.view.MenuItem; 40 import android.webkit.SslErrorHandler; 41 import android.webkit.WebChromeClient; 42 import android.webkit.WebSettings; 43 import android.webkit.WebView; 44 import android.webkit.WebViewClient; 45 import android.widget.ProgressBar; 46 import android.widget.TextView; 47 48 import java.io.IOException; 49 import java.net.HttpURLConnection; 50 import java.net.MalformedURLException; 51 import java.net.URL; 52 import java.lang.InterruptedException; 53 import java.lang.reflect.Field; 54 import java.lang.reflect.Method; 55 import java.util.Random; 56 57 public class CaptivePortalLoginActivity extends Activity { 58 private static final String TAG = "CaptivePortalLogin"; 59 private static final String DEFAULT_SERVER = "connectivitycheck.gstatic.com"; 60 private static final int SOCKET_TIMEOUT_MS = 10000; 61 62 private enum Result { DISMISSED, UNWANTED, WANTED_AS_IS }; 63 64 private URL mURL; 65 private Network mNetwork; 66 private CaptivePortal mCaptivePortal; 67 private NetworkCallback mNetworkCallback; 68 private ConnectivityManager mCm; 69 private boolean mLaunchBrowser = false; 70 private MyWebViewClient mWebViewClient; 71 72 @Override onCreate(Bundle savedInstanceState)73 protected void onCreate(Bundle savedInstanceState) { 74 super.onCreate(savedInstanceState); 75 76 String server = Settings.Global.getString(getContentResolver(), "captive_portal_server"); 77 if (server == null) server = DEFAULT_SERVER; 78 mCm = ConnectivityManager.from(this); 79 try { 80 mURL = new URL("http", server, "/generate_204"); 81 } catch (MalformedURLException e) { 82 // System misconfigured, bail out in a way that at least provides network access. 83 Log.e(TAG, "Invalid captive portal URL, server=" + server); 84 done(Result.WANTED_AS_IS); 85 } 86 mNetwork = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_NETWORK); 87 mCaptivePortal = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL); 88 89 // Also initializes proxy system properties. 90 mCm.bindProcessToNetwork(mNetwork); 91 92 // Proxy system properties must be initialized before setContentView is called because 93 // setContentView initializes the WebView logic which in turn reads the system properties. 94 setContentView(R.layout.activity_captive_portal_login); 95 96 getActionBar().setDisplayShowHomeEnabled(false); 97 98 // Exit app if Network disappears. 99 final NetworkCapabilities networkCapabilities = mCm.getNetworkCapabilities(mNetwork); 100 if (networkCapabilities == null) { 101 finish(); 102 return; 103 } 104 mNetworkCallback = new NetworkCallback() { 105 @Override 106 public void onLost(Network lostNetwork) { 107 if (mNetwork.equals(lostNetwork)) done(Result.UNWANTED); 108 } 109 }; 110 final NetworkRequest.Builder builder = new NetworkRequest.Builder(); 111 for (int transportType : networkCapabilities.getTransportTypes()) { 112 builder.addTransportType(transportType); 113 } 114 mCm.registerNetworkCallback(builder.build(), mNetworkCallback); 115 116 final WebView myWebView = (WebView) findViewById(R.id.webview); 117 myWebView.clearCache(true); 118 WebSettings webSettings = myWebView.getSettings(); 119 webSettings.setJavaScriptEnabled(true); 120 mWebViewClient = new MyWebViewClient(); 121 myWebView.setWebViewClient(mWebViewClient); 122 myWebView.setWebChromeClient(new MyWebChromeClient()); 123 // Start initial page load so WebView finishes loading proxy settings. 124 // Actual load of mUrl is initiated by MyWebViewClient. 125 myWebView.loadData("", "text/html", null); 126 } 127 128 // Find WebView's proxy BroadcastReceiver and prompt it to read proxy system properties. setWebViewProxy()129 private void setWebViewProxy() { 130 LoadedApk loadedApk = getApplication().mLoadedApk; 131 try { 132 Field receiversField = LoadedApk.class.getDeclaredField("mReceivers"); 133 receiversField.setAccessible(true); 134 ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk); 135 for (Object receiverMap : receivers.values()) { 136 for (Object rec : ((ArrayMap) receiverMap).keySet()) { 137 Class clazz = rec.getClass(); 138 if (clazz.getName().contains("ProxyChangeListener")) { 139 Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class, 140 Intent.class); 141 Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION); 142 onReceiveMethod.invoke(rec, getApplicationContext(), intent); 143 Log.v(TAG, "Prompting WebView proxy reload."); 144 } 145 } 146 } 147 } catch (Exception e) { 148 Log.e(TAG, "Exception while setting WebView proxy: " + e); 149 } 150 } 151 done(Result result)152 private void done(Result result) { 153 if (mNetworkCallback != null) { 154 mCm.unregisterNetworkCallback(mNetworkCallback); 155 mNetworkCallback = null; 156 } 157 switch (result) { 158 case DISMISSED: 159 mCaptivePortal.reportCaptivePortalDismissed(); 160 break; 161 case UNWANTED: 162 mCaptivePortal.ignoreNetwork(); 163 break; 164 case WANTED_AS_IS: 165 mCaptivePortal.useNetwork(); 166 break; 167 } 168 finish(); 169 } 170 171 @Override onCreateOptionsMenu(Menu menu)172 public boolean onCreateOptionsMenu(Menu menu) { 173 getMenuInflater().inflate(R.menu.captive_portal_login, menu); 174 return true; 175 } 176 177 @Override onBackPressed()178 public void onBackPressed() { 179 WebView myWebView = (WebView) findViewById(R.id.webview); 180 if (myWebView.canGoBack() && mWebViewClient.allowBack()) { 181 myWebView.goBack(); 182 } else { 183 super.onBackPressed(); 184 } 185 } 186 187 @Override onOptionsItemSelected(MenuItem item)188 public boolean onOptionsItemSelected(MenuItem item) { 189 int id = item.getItemId(); 190 if (id == R.id.action_use_network) { 191 done(Result.WANTED_AS_IS); 192 return true; 193 } 194 if (id == R.id.action_do_not_use_network) { 195 done(Result.UNWANTED); 196 return true; 197 } 198 return super.onOptionsItemSelected(item); 199 } 200 201 @Override onDestroy()202 public void onDestroy() { 203 super.onDestroy(); 204 205 if (mNetworkCallback != null) { 206 mCm.unregisterNetworkCallback(mNetworkCallback); 207 mNetworkCallback = null; 208 } 209 if (mLaunchBrowser) { 210 // Give time for this network to become default. After 500ms just proceed. 211 for (int i = 0; i < 5; i++) { 212 // TODO: This misses when mNetwork underlies a VPN. 213 if (mNetwork.equals(mCm.getActiveNetwork())) break; 214 try { 215 Thread.sleep(100); 216 } catch (InterruptedException e) { 217 } 218 } 219 startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(mURL.toString()))); 220 } 221 } 222 testForCaptivePortal()223 private void testForCaptivePortal() { 224 new Thread(new Runnable() { 225 public void run() { 226 // Give time for captive portal to open. 227 try { 228 Thread.sleep(1000); 229 } catch (InterruptedException e) { 230 } 231 HttpURLConnection urlConnection = null; 232 int httpResponseCode = 500; 233 try { 234 urlConnection = (HttpURLConnection) mURL.openConnection(); 235 urlConnection.setInstanceFollowRedirects(false); 236 urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS); 237 urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS); 238 urlConnection.setUseCaches(false); 239 urlConnection.getInputStream(); 240 httpResponseCode = urlConnection.getResponseCode(); 241 } catch (IOException e) { 242 } finally { 243 if (urlConnection != null) urlConnection.disconnect(); 244 } 245 if (httpResponseCode == 204) { 246 done(Result.DISMISSED); 247 } 248 } 249 }).start(); 250 } 251 252 private class MyWebViewClient extends WebViewClient { 253 private static final String INTERNAL_ASSETS = "file:///android_asset/"; 254 private final String mBrowserBailOutToken = Long.toString(new Random().nextLong()); 255 // How many Android device-independent-pixels per scaled-pixel 256 // dp/sp = (px/sp) / (px/dp) = (1/sp) / (1/dp) 257 private final float mDpPerSp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 1, 258 getResources().getDisplayMetrics()) / 259 TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1, 260 getResources().getDisplayMetrics()); 261 private int mPagesLoaded; 262 263 // If we haven't finished cleaning up the history, don't allow going back. allowBack()264 public boolean allowBack() { 265 return mPagesLoaded > 1; 266 } 267 268 @Override onPageStarted(WebView view, String url, Bitmap favicon)269 public void onPageStarted(WebView view, String url, Bitmap favicon) { 270 if (url.contains(mBrowserBailOutToken)) { 271 mLaunchBrowser = true; 272 done(Result.WANTED_AS_IS); 273 return; 274 } 275 // The first page load is used only to cause the WebView to 276 // fetch the proxy settings. Don't update the URL bar, and 277 // don't check if the captive portal is still there. 278 if (mPagesLoaded == 0) return; 279 // For internally generated pages, leave URL bar listing prior URL as this is the URL 280 // the page refers to. 281 if (!url.startsWith(INTERNAL_ASSETS)) { 282 final TextView myUrlBar = (TextView) findViewById(R.id.url_bar); 283 myUrlBar.setText(url); 284 } 285 testForCaptivePortal(); 286 } 287 288 @Override onPageFinished(WebView view, String url)289 public void onPageFinished(WebView view, String url) { 290 mPagesLoaded++; 291 if (mPagesLoaded == 1) { 292 // Now that WebView has loaded at least one page we know it has read in the proxy 293 // settings. Now prompt the WebView read the Network-specific proxy settings. 294 setWebViewProxy(); 295 // Load the real page. 296 view.loadUrl(mURL.toString()); 297 return; 298 } else if (mPagesLoaded == 2) { 299 // Prevent going back to empty first page. 300 view.clearHistory(); 301 } 302 testForCaptivePortal(); 303 } 304 305 // Convert Android device-independent-pixels (dp) to HTML size. dp(int dp)306 private String dp(int dp) { 307 // HTML px's are scaled just like dp's, so just add "px" suffix. 308 return Integer.toString(dp) + "px"; 309 } 310 311 // Convert Android scaled-pixels (sp) to HTML size. sp(int sp)312 private String sp(int sp) { 313 // Convert sp to dp's. 314 float dp = sp * mDpPerSp; 315 // Apply a scale factor to make things look right. 316 dp *= 1.3; 317 // Convert dp's to HTML size. 318 return dp((int)dp); 319 } 320 321 // A web page consisting of a large broken lock icon to indicate SSL failure. 322 private final String SSL_ERROR_HTML = "<html><head><style>" + 323 "body { margin-left:" + dp(48) + "; margin-right:" + dp(48) + "; " + 324 "margin-top:" + dp(96) + "; background-color:#fafafa; }" + 325 "img { width:" + dp(48) + "; height:" + dp(48) + "; }" + 326 "div.warn { font-size:" + sp(16) + "; margin-top:" + dp(16) + "; " + 327 " opacity:0.87; line-height:1.28; }" + 328 "div.example { font-size:" + sp(14) + "; margin-top:" + dp(16) + "; " + 329 " opacity:0.54; line-height:1.21905; }" + 330 "a { font-size:" + sp(14) + "; text-decoration:none; text-transform:uppercase; " + 331 " margin-top:" + dp(24) + "; display:inline-block; color:#4285F4; " + 332 " height:" + dp(48) + "; font-weight:bold; }" + 333 "</style></head><body><p><img src=quantum_ic_warning_amber_96.png><br>" + 334 "<div class=warn>%s</div>" + 335 "<div class=example>%s</div>" + 336 "<a href=%s>%s</a></body></html>"; 337 338 @Override onReceivedSslError(WebView view, SslErrorHandler handler, SslError error)339 public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) { 340 Log.w(TAG, "SSL error (error: " + error.getPrimaryError() + " host: " + 341 // Only show host to avoid leaking private info. 342 Uri.parse(error.getUrl()).getHost() + " certificate: " + 343 error.getCertificate() + "); displaying SSL warning."); 344 final String html = String.format(SSL_ERROR_HTML, getString(R.string.ssl_error_warning), 345 getString(R.string.ssl_error_example), mBrowserBailOutToken, 346 getString(R.string.ssl_error_continue)); 347 view.loadDataWithBaseURL(INTERNAL_ASSETS, html, "text/HTML", "UTF-8", null); 348 } 349 350 @Override shouldOverrideUrlLoading(WebView view, String url)351 public boolean shouldOverrideUrlLoading (WebView view, String url) { 352 if (url.startsWith("tel:")) { 353 startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse(url))); 354 return true; 355 } 356 return false; 357 } 358 } 359 360 private class MyWebChromeClient extends WebChromeClient { 361 @Override onProgressChanged(WebView view, int newProgress)362 public void onProgressChanged(WebView view, int newProgress) { 363 final ProgressBar myProgressBar = (ProgressBar) findViewById(R.id.progress_bar); 364 myProgressBar.setProgress(newProgress); 365 } 366 } 367 } 368