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