privacybrowser/dialogs/ViewSslCertificateDialog.java

   1 /*
   2  * Copyright © 2016-2020 Soren Stoutner <soren@stoutner.com>.
   3  *
   4  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
   5  *
   6  * Privacy Browser is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Privacy Browser is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 package com.stoutner.privacybrowser.dialogs;
  21
  22 import android.annotation.SuppressLint;
  23 import android.app.Activity;
  24 import android.app.AlertDialog;
  25 import android.app.Dialog;
  26 import android.content.Context;
  27 import android.content.SharedPreferences;
  28 import android.graphics.drawable.BitmapDrawable;
  29 import android.graphics.drawable.Drawable;
  30 import android.net.Uri;
  31 import android.net.http.SslCertificate;
  32 import android.os.Bundle;
  33 import android.text.SpannableStringBuilder;
  34 import android.text.Spanned;
  35 import android.text.style.ForegroundColorSpan;
  36 import android.view.LayoutInflater;
  37 import android.view.View;
  38 import android.view.WindowManager;
  39 import android.widget.TextView;
  40
  41 import androidx.annotation.NonNull;
  42 import androidx.fragment.app.DialogFragment;  // The AndroidX dialog fragment must be used or an error is produced on API <=22.
  43 import androidx.preference.PreferenceManager;
  44
  45 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  46 import com.stoutner.privacybrowser.R;
  47 import com.stoutner.privacybrowser.fragments.WebViewTabFragment;
  48 import com.stoutner.privacybrowser.views.NestedScrollWebView;
  49
  50 import java.text.DateFormat;
  51 import java.util.Calendar;
  52 import java.util.Date;
  53
  54 public class ViewSslCertificateDialog extends DialogFragment {
  55     public static ViewSslCertificateDialog displayDialog(long webViewFragmentId) {
  56         // Create an arguments bundle.
  57         Bundle argumentsBundle = new Bundle();
  58
  59         // Store the WebView fragment ID in the bundle.
  60         argumentsBundle.putLong("webview_fragment_id", webViewFragmentId);
  61
  62         // Create a new instance of the dialog.
  63         ViewSslCertificateDialog viewSslCertificateDialog = new ViewSslCertificateDialog();
  64
  65         // Add the bundle to the dialog.
  66         viewSslCertificateDialog.setArguments(argumentsBundle);
  67
  68         // Return the new dialog.
  69         return viewSslCertificateDialog;
  70     }
  71
  72     // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the alert dialog.
  73     @SuppressLint("InflateParams")
  74     @Override
  75     @NonNull
  76     public Dialog onCreateDialog(Bundle savedInstanceState) {
  77         // Get a handle for the activity and the context.
  78         Activity activity = getActivity();
  79         Context context = getContext();
  80
  81         // Remove the incorrect lint warnings below that the activity and context might be null.
  82         assert activity != null;
  83         assert context != null;
  84
  85         // Get the activity's layout inflater.
  86         LayoutInflater layoutInflater = activity.getLayoutInflater();
  87
  88         // Get the arguments.
  89         Bundle arguments = getArguments();
  90
  91         // Remove the incorrect lint warning below that the arguments might be null.
  92         assert arguments != null;
  93
  94         // Get the current position of this WebView fragment.
  95         int webViewPosition = MainWebViewActivity.webViewPagerAdapter.getPositionForId(arguments.getLong("webview_fragment_id"));
  96
  97         // Get the WebView tab fragment.
  98         WebViewTabFragment webViewTabFragment = MainWebViewActivity.webViewPagerAdapter.getPageFragment(webViewPosition);
  99
 100         // Get the fragment view.
 101         View fragmentView = webViewTabFragment.getView();
 102
 103         // Remove the incorrect lint warning below that the fragment view might be null.
 104         assert fragmentView != null;
 105
 106         // Get a handle for the current WebView.
 107         NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
 108
 109
 110         // Use a builder to create the alert dialog.
 111         AlertDialog.Builder dialogBuilder;
 112
 113         // Get a handle for the shared preferences.
 114         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
 115
 116         // Get the screenshot and theme preferences.
 117         boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
 118         boolean allowScreenshots = sharedPreferences.getBoolean("allow_screenshots", false);
 119
 120         // Set the style according to the theme.
 121         if (darkTheme) {
 122             dialogBuilder = new AlertDialog.Builder(activity, R.style.PrivacyBrowserAlertDialogDark);
 123         } else {
 124             dialogBuilder = new AlertDialog.Builder(activity, R.style.PrivacyBrowserAlertDialogLight);
 125         }
 126
 127         // Create a drawable version of the favorite icon.
 128         Drawable favoriteIconDrawable = new BitmapDrawable(getResources(), nestedScrollWebView.getFavoriteOrDefaultIcon());
 129
 130         // Set the icon.
 131         dialogBuilder.setIcon(favoriteIconDrawable);
 132
 133         // Set the close button listener.  Using `null` as the listener closes the dialog without doing anything else.
 134         dialogBuilder.setNegativeButton(R.string.close, null);
 135
 136         // Get the SSL certificate.
 137         SslCertificate sslCertificate = nestedScrollWebView.getCertificate();
 138
 139         // Check to see if the website is encrypted.
 140         if (sslCertificate == null) {  // The website is not encrypted.
 141             // Set the title.
 142             dialogBuilder.setTitle(R.string.unencrypted_website);
 143
 144             // Set the Layout.  The parent view is `null` because it will be assigned by the alert dialog.
 145             dialogBuilder.setView(layoutInflater.inflate(R.layout.unencrypted_website_dialog, null));
 146
 147             // Create an alert dialog from the alert dialog builder.
 148             final AlertDialog alertDialog = dialogBuilder.create();
 149
 150             // Disable screenshots if not allowed.
 151             if (!allowScreenshots) {
 152                 // Remove the warning below that `getWindow()` might be null.
 153                 assert alertDialog.getWindow() != null;
 154
 155                 // Disable screenshots.
 156                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 157             }
 158
 159             // `onCreateDialog` requires the return of an `AlertDialog`.
 160             return alertDialog;
 161         } else {  // Display the SSL certificate information
 162             // Set the title.
 163             dialogBuilder.setTitle(R.string.ssl_certificate);
 164
 165             // Set the layout.  The parent view is `null` because it will be assigned by the alert dialog.
 166             dialogBuilder.setView(layoutInflater.inflate(R.layout.view_ssl_certificate_dialog, null));
 167
 168             // Create an alert dialog from the builder.
 169             final AlertDialog alertDialog = dialogBuilder.create();
 170
 171             // Disable screenshots if not allowed.
 172             if (!allowScreenshots) {
 173                 // Remove the warning below that `getWindow()` might be null.
 174                 assert alertDialog.getWindow() != null;
 175
 176                 // Disable screenshots.
 177                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 178             }
 179
 180             // The alert dialog must be shown before items in the layout can be modified.
 181             alertDialog.show();
 182
 183             // Get handles for the text views.
 184             TextView domainTextView = alertDialog.findViewById(R.id.domain);
 185             TextView ipAddressesTextView = alertDialog.findViewById(R.id.ip_addresses);
 186             TextView issuedToCNameTextView = alertDialog.findViewById(R.id.issued_to_cname);
 187             TextView issuedToONameTextView = alertDialog.findViewById(R.id.issued_to_oname);
 188             TextView issuedToUNameTextView = alertDialog.findViewById(R.id.issued_to_uname);
 189             TextView issuedByCNameTextView = alertDialog.findViewById(R.id.issued_by_cname);
 190             TextView issuedByONameTextView = alertDialog.findViewById(R.id.issued_by_oname);
 191             TextView issuedByUNameTextView = alertDialog.findViewById(R.id.issued_by_uname);
 192             TextView startDateTextView = alertDialog.findViewById(R.id.start_date);
 193             TextView endDateTextView = alertDialog.findViewById(R.id.end_date);
 194
 195             // Setup the labels.
 196             String domainLabel = getString(R.string.domain_label) + "  ";
 197             String ipAddressesLabel = getString(R.string.ip_addresses) + "  ";
 198             String cNameLabel = getString(R.string.common_name) + "  ";
 199             String oNameLabel = getString(R.string.organization) + "  ";
 200             String uNameLabel = getString(R.string.organizational_unit) + "  ";
 201             String startDateLabel = getString(R.string.start_date) + "  ";
 202             String endDateLabel = getString(R.string.end_date) + "  ";
 203
 204             // Convert the formatted URL string to a URI.
 205             Uri uri = Uri.parse(nestedScrollWebView.getUrl());
 206
 207             // Extract the domain name from the URI.
 208             String domainString = uri.getHost();
 209
 210             // Get the strings from the SSL certificate.
 211             String issuedToCName = sslCertificate.getIssuedTo().getCName();
 212             String issuedToOName = sslCertificate.getIssuedTo().getOName();
 213             String issuedToUName = sslCertificate.getIssuedTo().getUName();
 214             String issuedByCName = sslCertificate.getIssuedBy().getCName();
 215             String issuedByOName = sslCertificate.getIssuedBy().getOName();
 216             String issuedByUName = sslCertificate.getIssuedBy().getUName();
 217             Date startDate = sslCertificate.getValidNotBeforeDate();
 218             Date endDate = sslCertificate.getValidNotAfterDate();
 219
 220             // Create spannable string builders for each text view that needs multiple colors of text.
 221             SpannableStringBuilder domainStringBuilder = new SpannableStringBuilder(domainLabel + domainString);
 222             SpannableStringBuilder ipAddressesStringBuilder = new SpannableStringBuilder(ipAddressesLabel + nestedScrollWebView.getCurrentIpAddresses());
 223             SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 224             SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 225             SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 226             SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 227             SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 228             SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 229             SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 230             SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 231
 232             // Create a red foreground color span.  The deprecated `getColor` must be used until the minimum API >= 23.
 233             ForegroundColorSpan redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
 234
 235             // Create a blue foreground color span.
 236             ForegroundColorSpan blueColorSpan;
 237
 238             // Set the blue color span according to the theme.  The deprecated `getColor()` must be used until the minimum API >= 23.
 239             if (darkTheme) {
 240                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 241             } else {
 242                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 243             }
 244
 245             // Remove the incorrect lint error that `.equals` might produce a NullPointerException.
 246             assert domainString != null;
 247
 248             // Formet the domain string and issued to CName colors.
 249             if (domainString.equals(issuedToCName)) {  // `domainString` and `issuedToCName` match.
 250                 // Set the strings to be blue.
 251                 domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 252                 issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 253             } else if(issuedToCName.startsWith("*.")){  // `issuedToCName` begins with a wildcard.
 254                 // Remove the initial `*.`.
 255                 String baseCertificateDomain = issuedToCName.substring(2);
 256
 257                 // Setup a copy of `domainString` to test subdomains.
 258                 String domainStringSubdomain = domainString;
 259
 260                 // Initialize `domainNamesMatch`.
 261                 boolean domainNamesMatch = false;
 262
 263                 // Check all the subdomains in `domainStringSubdomain` against `baseCertificateDomain`.
 264                 while (!domainNamesMatch && domainStringSubdomain.contains(".")) {  // Stop checking if we know that `domainNamesMatch` is `true` or if we run out of  `.`.
 265                     // Test the `domainStringSubdomain` against `baseCertificateDomain`.
 266                     if (domainStringSubdomain.equals(baseCertificateDomain)) {
 267                         domainNamesMatch = true;
 268                     }
 269
 270                     // Strip out the lowest subdomain of `certificateCommonNameSubdomain`.
 271                     domainStringSubdomain = domainStringSubdomain.substring(domainStringSubdomain.indexOf(".") + 1);
 272                 }
 273
 274                 // Format the domain and issued to Common Name according to `domainNamesMatch`.
 275                 if (domainNamesMatch) {  // `domainString` is a subdomain of the wildcard `issuedToCNameString`.
 276                     // Set the strings to be blue.
 277                     domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 278                     issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 279                 } else {  // `domainString` is not a subdomain of the wildcard `issuedToCNameString`.
 280                     // Set the string to be red.
 281                     domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 282                     issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 283                 }
 284             } else {  // The strings do not match and `issuedToCNameString` does not begin with a wildcard.
 285                 // Set the strings to be red.
 286                 domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 287                 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 288             }
 289
 290             // Set the IP addresses, issued to, and issued by spans to display the certificate information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 291             ipAddressesStringBuilder.setSpan(blueColorSpan, ipAddressesLabel.length(), ipAddressesStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 292             issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 293             issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 294             issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 295             issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 296             issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 297
 298             // Get the current date.
 299             Date currentDate = Calendar.getInstance().getTime();
 300
 301             //  Format the start date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 302             if (startDate.after(currentDate)) {  // The certificate start date is in the future.
 303                 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 304             } else {  // The certificate start date is in the past.
 305                 startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 306             }
 307
 308             // Format the end date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 309             if (endDate.before(currentDate)) {  // The certificate end date is in the past.
 310                 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 311             } else {  // The certificate end date is in the future.
 312                 endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 313             }
 314
 315             // Display the strings.
 316             domainTextView.setText(domainStringBuilder);
 317             ipAddressesTextView.setText(ipAddressesStringBuilder);
 318             issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 319             issuedToONameTextView.setText(issuedToONameStringBuilder);
 320             issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 321             issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 322             issuedByONameTextView.setText(issuedByONameStringBuilder);
 323             issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 324             startDateTextView.setText(startDateStringBuilder);
 325             endDateTextView.setText(endDateStringBuilder);
 326
 327             // `onCreateDialog` requires the return of an alert dialog.
 328             return alertDialog;
 329         }
 330     }
 331 }