app/src/main/java/com/stoutner/privacybrowser/dialogs/ViewSslCertificateDialog.java

   1 /*
   2  * Copyright © 2016-2019 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.AlertDialog;
  24 import android.app.Dialog;
  25 import android.graphics.Bitmap;
  26 import android.graphics.BitmapFactory;
  27 import android.graphics.drawable.BitmapDrawable;
  28 import android.graphics.drawable.Drawable;
  29 import android.net.Uri;
  30 import android.net.http.SslCertificate;
  31 import android.os.Bundle;
  32 import android.text.SpannableStringBuilder;
  33 import android.text.Spanned;
  34 import android.text.style.ForegroundColorSpan;
  35 import android.view.LayoutInflater;
  36 import android.view.View;
  37 import android.view.WindowManager;
  38 import android.widget.TextView;
  39
  40 import androidx.annotation.NonNull;
  41 import androidx.fragment.app.DialogFragment;  // The AndroidX dialog fragment must be used or an error is produced on API <=22.
  42
  43 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  44 import com.stoutner.privacybrowser.R;
  45 import com.stoutner.privacybrowser.fragments.WebViewTabFragment;
  46 import com.stoutner.privacybrowser.views.NestedScrollWebView;
  47
  48 import java.io.ByteArrayOutputStream;
  49 import java.text.DateFormat;
  50 import java.util.Calendar;
  51 import java.util.Date;
  52
  53 // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the `AlertDialog`.
  54 @SuppressLint("InflateParams")
  55 public class ViewSslCertificateDialog extends DialogFragment {
  56     public static ViewSslCertificateDialog displayDialog(long webViewFragmentId) {
  57         // Create an arguments bundle.
  58         Bundle argumentsBundle = new Bundle();
  59
  60         // Store the WebView fragment ID in the bundle.
  61         argumentsBundle.putLong("webview_fragment_id", webViewFragmentId);
  62
  63         // Create a new instance of the dialog.
  64         ViewSslCertificateDialog viewSslCertificateDialog = new ViewSslCertificateDialog();
  65
  66         // Add the bundle to the dialog.
  67         viewSslCertificateDialog.setArguments(argumentsBundle);
  68
  69         // Return the new dialog.
  70         return viewSslCertificateDialog;
  71     }
  72
  73     @NonNull
  74     public Dialog onCreateDialog(Bundle savedInstanceState) {
  75         // Remove the incorrect lint warning below that the activity might be null.
  76         assert getActivity() != null;
  77
  78         // Get the activity's layout inflater.
  79         LayoutInflater layoutInflater = getActivity().getLayoutInflater();
  80
  81         // Get the arguments.
  82         Bundle arguments = getArguments();
  83
  84         // Remove the incorrect lint warning below that `getArguments().getLong()` might be null.
  85         assert arguments != null;
  86
  87         // Get the current position of this WebView fragment.
  88         int webViewPosition = MainWebViewActivity.webViewPagerAdapter.getPositionForId(arguments.getLong("webview_fragment_id"));
  89
  90         // Get the WebView tab fragment.
  91         WebViewTabFragment webViewTabFragment = MainWebViewActivity.webViewPagerAdapter.getPageFragment(webViewPosition);
  92
  93         // Get the fragment view.
  94         View fragmentView = webViewTabFragment.getView();
  95
  96         // Remove the incorrect lint warning below that the fragment view might be null.
  97         assert fragmentView != null;
  98
  99         // Get a handle for the current WebView.
 100         NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
 101
 102         // Use a builder to create the alert dialog.
 103         AlertDialog.Builder dialogBuilder;
 104
 105         // Set the style according to the theme.
 106         if (MainWebViewActivity.darkTheme) {
 107             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogDark);
 108         } else {
 109             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogLight);
 110         }
 111
 112         // Create a drawable version of the favorite icon.
 113         Drawable favoriteIconDrawable = new BitmapDrawable(getResources(), nestedScrollWebView.getFavoriteOrDefaultIcon());
 114
 115         // Set the icon.
 116         dialogBuilder.setIcon(favoriteIconDrawable);
 117
 118         // Set a listener on the negative button.  Using `null` as the listener closes the dialog without doing anything else.
 119         dialogBuilder.setNegativeButton(R.string.close, null);
 120
 121         // Get the SSL certificate.
 122         SslCertificate sslCertificate = nestedScrollWebView.getCertificate();
 123
 124         // Check to see if the website is encrypted.
 125         if (sslCertificate == null) {  // The website is not encrypted.
 126             // Set the title.
 127             dialogBuilder.setTitle(R.string.unencrypted_website);
 128
 129             // Set the Layout.  The parent view is `null` because it will be assigned by `AlertDialog`.
 130             dialogBuilder.setView(layoutInflater.inflate(R.layout.unencrypted_website, null));
 131
 132             // Create an alert dialog from the alert dialog builder.
 133             final AlertDialog alertDialog = dialogBuilder.create();
 134
 135             // Disable screenshots if not allowed.
 136             if (!MainWebViewActivity.allowScreenshots) {
 137                 // Remove the warning below that `getWindow()` might be null.
 138                 assert alertDialog.getWindow() != null;
 139
 140                 // Disable screenshots.
 141                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 142             }
 143
 144             // `onCreateDialog` requires the return of an `AlertDialog`.
 145             return alertDialog;
 146
 147         } else {  // Display the SSL certificate information
 148             // Set the title.
 149             dialogBuilder.setTitle(R.string.ssl_certificate);
 150
 151             // Set the layout.  The parent view is `null` because it will be assigned by `AlertDialog`.
 152             dialogBuilder.setView(layoutInflater.inflate(R.layout.view_ssl_certificate, null));
 153
 154             // Create an alert dialog from the builder.
 155             final AlertDialog alertDialog = dialogBuilder.create();
 156
 157             // Disable screenshots if not allowed.
 158             if (!MainWebViewActivity.allowScreenshots) {
 159                 // Remove the warning below that `getWindow()` might be null.
 160                 assert alertDialog.getWindow() != null;
 161
 162                 // Disable screenshots.
 163                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 164             }
 165
 166             // The alert dialog must be shown before items in the layout can be modified.
 167             alertDialog.show();
 168
 169             // Get handles for the text views.
 170             TextView domainTextView = alertDialog.findViewById(R.id.domain);
 171             TextView ipAddressesTextView = alertDialog.findViewById(R.id.ip_addresses);
 172             TextView issuedToCNameTextView = alertDialog.findViewById(R.id.issued_to_cname);
 173             TextView issuedToONameTextView = alertDialog.findViewById(R.id.issued_to_oname);
 174             TextView issuedToUNameTextView = alertDialog.findViewById(R.id.issued_to_uname);
 175             TextView issuedByCNameTextView = alertDialog.findViewById(R.id.issued_by_cname);
 176             TextView issuedByONameTextView = alertDialog.findViewById(R.id.issued_by_oname);
 177             TextView issuedByUNameTextView = alertDialog.findViewById(R.id.issued_by_uname);
 178             TextView startDateTextView = alertDialog.findViewById(R.id.start_date);
 179             TextView endDateTextView = alertDialog.findViewById(R.id.end_date);
 180
 181             // Setup the labels.
 182             String domainLabel = getString(R.string.domain_label) + "  ";
 183             String ipAddressesLabel = getString(R.string.ip_addresses) + "  ";
 184             String cNameLabel = getString(R.string.common_name) + "  ";
 185             String oNameLabel = getString(R.string.organization) + "  ";
 186             String uNameLabel = getString(R.string.organizational_unit) + "  ";
 187             String startDateLabel = getString(R.string.start_date) + "  ";
 188             String endDateLabel = getString(R.string.end_date) + "  ";
 189
 190             // Convert the formatted URL string to a URI.
 191             Uri uri = Uri.parse(nestedScrollWebView.getUrl());
 192
 193             // Extract the domain name from the URI.
 194             String domainString = uri.getHost();
 195
 196             // Get the strings from the SSL certificate.
 197             String issuedToCName = sslCertificate.getIssuedTo().getCName();
 198             String issuedToOName = sslCertificate.getIssuedTo().getOName();
 199             String issuedToUName = sslCertificate.getIssuedTo().getUName();
 200             String issuedByCName = sslCertificate.getIssuedBy().getCName();
 201             String issuedByOName = sslCertificate.getIssuedBy().getOName();
 202             String issuedByUName = sslCertificate.getIssuedBy().getUName();
 203             Date startDate = sslCertificate.getValidNotBeforeDate();
 204             Date endDate = sslCertificate.getValidNotAfterDate();
 205
 206             // Create spannable string builders for each text view that needs multiple colors of text.
 207             SpannableStringBuilder domainStringBuilder = new SpannableStringBuilder(domainLabel + domainString);
 208             SpannableStringBuilder ipAddressesStringBuilder = new SpannableStringBuilder(ipAddressesLabel + nestedScrollWebView.getCurrentIpAddresses());
 209             SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 210             SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 211             SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 212             SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 213             SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 214             SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 215             SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 216             SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 217
 218             // Create a red foreground color span.  The deprecated `getColor` must be used until the minimum API >= 23.
 219             @SuppressWarnings("deprecation") ForegroundColorSpan redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
 220
 221             // Create a blue foreground color span.
 222             ForegroundColorSpan blueColorSpan;
 223
 224             // Set the blue color span according to the theme.  The deprecated `getColor()` must be used until the minimum API >= 23.
 225             if (MainWebViewActivity.darkTheme) {
 226                 //noinspection deprecation
 227                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 228             } else {
 229                 //noinspection deprecation
 230                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 231             }
 232
 233             // Remove the incorrect lint error that `.equals` might produce a NullPointerException.
 234             assert domainString != null;
 235
 236             // Formet the domain string and issued to CName colors.
 237             if (domainString.equals(issuedToCName)) {  // `domainString` and `issuedToCName` match.
 238                 // Set the strings to be blue.
 239                 domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 240                 issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 241             } else if(issuedToCName.startsWith("*.")){  // `issuedToCName` begins with a wildcard.
 242                 // Remove the initial `*.`.
 243                 String baseCertificateDomain = issuedToCName.substring(2);
 244
 245                 // Setup a copy of `domainString` to test subdomains.
 246                 String domainStringSubdomain = domainString;
 247
 248                 // Initialize `domainNamesMatch`.
 249                 boolean domainNamesMatch = false;
 250
 251                 // Check all the subdomains in `domainStringSubdomain` against `baseCertificateDomain`.
 252                 while (!domainNamesMatch && domainStringSubdomain.contains(".")) {  // Stop checking if we know that `domainNamesMatch` is `true` or if we run out of  `.`.
 253                     // Test the `domainStringSubdomain` against `baseCertificateDomain`.
 254                     if (domainStringSubdomain.equals(baseCertificateDomain)) {
 255                         domainNamesMatch = true;
 256                     }
 257
 258                     // Strip out the lowest subdomain of `certificateCommonNameSubdomain`.
 259                     domainStringSubdomain = domainStringSubdomain.substring(domainStringSubdomain.indexOf(".") + 1);
 260                 }
 261
 262                 // Format the domain and issued to Common Name according to `domainNamesMatch`.
 263                 if (domainNamesMatch) {  // `domainString` is a subdomain of the wildcard `issuedToCNameString`.
 264                     // Set the strings to be blue.
 265                     domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 266                     issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 267                 } else {  // `domainString` is not a subdomain of the wildcard `issuedToCNameString`.
 268                     // Set the string to be red.
 269                     domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 270                     issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 271                 }
 272             } else {  // The strings do not match and `issuedToCNameString` does not begin with a wildcard.
 273                 // Set the strings to be red.
 274                 domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 275                 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 276             }
 277
 278             // 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.
 279             ipAddressesStringBuilder.setSpan(blueColorSpan, ipAddressesLabel.length(), ipAddressesStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 280             issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 281             issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 282             issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 283             issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 284             issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 285
 286             // Get the current date.
 287             Date currentDate = Calendar.getInstance().getTime();
 288
 289             //  Format the start date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 290             if (startDate.after(currentDate)) {  // The certificate start date is in the future.
 291                 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 292             } else {  // The certificate start date is in the past.
 293                 startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 294             }
 295
 296             // Format the end date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 297             if (endDate.before(currentDate)) {  // The certificate end date is in the past.
 298                 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 299             } else {  // The certificate end date is in the future.
 300                 endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 301             }
 302
 303             // Display the strings.
 304             domainTextView.setText(domainStringBuilder);
 305             ipAddressesTextView.setText(ipAddressesStringBuilder);
 306             issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 307             issuedToONameTextView.setText(issuedToONameStringBuilder);
 308             issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 309             issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 310             issuedByONameTextView.setText(issuedByONameStringBuilder);
 311             issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 312             startDateTextView.setText(startDateStringBuilder);
 313             endDateTextView.setText(endDateStringBuilder);
 314
 315             // `onCreateDialog` requires the return of an alert dialog.
 316             return alertDialog;
 317         }
 318     }
 319 }