git.ipfire.org Git - thirdparty/strongswan.git/blob

   1 /*
   2  * Copyright (C) 2014 Tobias Brunner
   3  *
   4  * Copyright (C) secunet Security Networks AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  14  * for more details.
  15  */
  16
  17 package org.strongswan.android.ui;
  18
  19 import android.app.Dialog;
  20 import android.content.ActivityNotFoundException;
  21 import android.content.DialogInterface;
  22 import android.content.Intent;
  23 import android.net.Uri;
  24 import android.os.Bundle;
  25 import android.widget.Toast;
  26
  27 import org.strongswan.android.R;
  28 import org.strongswan.android.data.VpnProfileDataSource;
  29 import org.strongswan.android.logic.TrustedCertificateManager;
  30
  31 import java.io.FileNotFoundException;
  32 import java.io.InputStream;
  33 import java.security.KeyStore;
  34 import java.security.cert.CertificateException;
  35 import java.security.cert.CertificateFactory;
  36 import java.security.cert.X509Certificate;
  37
  38 import androidx.activity.result.ActivityResultLauncher;
  39 import androidx.activity.result.contract.ActivityResultContracts;
  40 import androidx.appcompat.app.AlertDialog;
  41 import androidx.appcompat.app.AppCompatActivity;
  42 import androidx.appcompat.app.AppCompatDialogFragment;
  43 import androidx.fragment.app.FragmentTransaction;
  44
  45 public class TrustedCertificateImportActivity extends AppCompatActivity
  46 {
  47         private static final String DIALOG_TAG = "Dialog";
  48         private Uri mCertificateUri;
  49
  50         private final ActivityResultLauncher<Intent> mOpenDocument = registerForActivityResult(
  51                 new ActivityResultContracts.StartActivityForResult(),
  52                 result -> {
  53                         if (result.getResultCode() == RESULT_OK && result.getData() != null)
  54                         {
  55                                 mCertificateUri = result.getData().getData();
  56                                 return;
  57                         }
  58                         finish();
  59                 }
  60         );
  61
  62         @Override
  63         public void onCreate(Bundle savedInstanceState)
  64         {
  65                 super.onCreate(savedInstanceState);
  66
  67                 if (savedInstanceState != null)
  68                 {       /* do nothing when we are restoring */
  69                         return;
  70                 }
  71
  72                 Intent intent = getIntent();
  73                 String action = intent.getAction();
  74                 if (Intent.ACTION_VIEW.equals(action))
  75                 {
  76                         importCertificate(intent.getData());
  77                 }
  78                 else
  79                 {
  80                         Intent openIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
  81                         openIntent.setType("*/*");
  82                         try
  83                         {
  84                                 mOpenDocument.launch(openIntent);
  85                         }
  86                         catch (ActivityNotFoundException e)
  87                         {       /* some devices are unable to browse for files */
  88                                 finish();
  89                         }
  90                 }
  91         }
  92
  93         @Override
  94         protected void onPostResume()
  95         {
  96                 super.onPostResume();
  97                 if (mCertificateUri != null)
  98                 {
  99                         importCertificate(mCertificateUri);
 100                         mCertificateUri = null;
 101                 }
 102         }
 103
 104         /**
 105          * Import the file pointed to by the given URI as a certificate.
 106          *
 107          * @param uri
 108          */
 109         private void importCertificate(Uri uri)
 110         {
 111                 X509Certificate certificate = parseCertificate(uri);
 112                 if (certificate == null)
 113                 {
 114                         Toast.makeText(this, R.string.cert_import_failed, Toast.LENGTH_LONG).show();
 115                         finish();
 116                         return;
 117                 }
 118                 /* Ask the user whether to import the certificate.  This is particularly
 119                  * necessary because the import activity can be triggered by any app on
 120                  * the system.  Also, if our app is the only one that is registered to
 121                  * open certificate files by MIME type the user would have no idea really
 122                  * where the file was imported just by reading the Toast we display. */
 123                 ConfirmImportDialog dialog = new ConfirmImportDialog();
 124                 Bundle args = new Bundle();
 125                 args.putSerializable(VpnProfileDataSource.KEY_CERTIFICATE, certificate);
 126                 dialog.setArguments(args);
 127                 FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
 128                 ft.add(dialog, DIALOG_TAG);
 129                 ft.commit();
 130         }
 131
 132         /**
 133          * Load the file from the given URI and try to parse it as X.509 certificate.
 134          *
 135          * @param uri
 136          * @return certificate or null
 137          */
 138         private X509Certificate parseCertificate(Uri uri)
 139         {
 140                 X509Certificate certificate = null;
 141                 try
 142                 {
 143                         CertificateFactory factory = CertificateFactory.getInstance("X.509");
 144                         InputStream in = getContentResolver().openInputStream(uri);
 145                         certificate = (X509Certificate)factory.generateCertificate(in);
 146                         /* we don't check whether it's actually a CA certificate or not */
 147                 }
 148                 catch (CertificateException e)
 149                 {
 150                         e.printStackTrace();
 151                 }
 152                 catch (FileNotFoundException e)
 153                 {
 154                         e.printStackTrace();
 155                 }
 156                 return certificate;
 157         }
 158
 159
 160         /**
 161          * Try to store the given certificate in the KeyStore.
 162          *
 163          * @param certificate
 164          * @return whether it was successfully stored
 165          */
 166         private boolean storeCertificate(X509Certificate certificate)
 167         {
 168                 try
 169                 {
 170                         KeyStore store = KeyStore.getInstance("LocalCertificateStore");
 171                         store.load(null, null);
 172                         store.setCertificateEntry(null, certificate);
 173                         TrustedCertificateManager.getInstance().reset();
 174                         return true;
 175                 }
 176                 catch (Exception e)
 177                 {
 178                         e.printStackTrace();
 179                         return false;
 180                 }
 181         }
 182
 183         /**
 184          * Class that displays a confirmation dialog when a certificate should get
 185          * imported. If the user confirms the import we try to store it.
 186          */
 187         public static class ConfirmImportDialog extends AppCompatDialogFragment
 188         {
 189                 @Override
 190                 public Dialog onCreateDialog(Bundle savedInstanceState)
 191                 {
 192                         final X509Certificate certificate;
 193
 194                         certificate = (X509Certificate)getArguments().getSerializable(VpnProfileDataSource.KEY_CERTIFICATE);
 195
 196                         return new AlertDialog.Builder(getActivity())
 197                                 .setIcon(R.mipmap.ic_app)
 198                                 .setTitle(R.string.import_certificate)
 199                                 .setMessage(certificate.getSubjectDN().toString())
 200                                 .setPositiveButton(R.string.import_certificate, new DialogInterface.OnClickListener()
 201                                 {
 202                                         @Override
 203                                         public void onClick(DialogInterface dialog, int whichButton)
 204                                         {
 205                                                 TrustedCertificateImportActivity activity = (TrustedCertificateImportActivity)getActivity();
 206                                                 if (activity.storeCertificate(certificate))
 207                                                 {
 208                                                         Toast.makeText(getActivity(), R.string.cert_imported_successfully, Toast.LENGTH_LONG).show();
 209                                                         getActivity().setResult(RESULT_OK);
 210                                                 }
 211                                                 else
 212                                                 {
 213                                                         Toast.makeText(getActivity(), R.string.cert_import_failed, Toast.LENGTH_LONG).show();
 214                                                 }
 215                                                 getActivity().finish();
 216                                         }
 217                                 })
 218                                 .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener()
 219                                 {
 220                                         @Override
 221                                         public void onClick(DialogInterface dialog, int which)
 222                                         {
 223                                                 getActivity().finish();
 224                                         }
 225                                 }).create();
 226                 }
 227
 228                 @Override
 229                 public void onCancel(DialogInterface dialog)
 230                 {
 231                         getActivity().finish();
 232                 }
 233         }
 234 }