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.annotation.TargetApi;
  20 import android.app.Dialog;
  21 import android.content.ActivityNotFoundException;
  22 import android.content.DialogInterface;
  23 import android.content.Intent;
  24 import android.net.Uri;
  25 import android.os.Build;
  26 import android.os.Bundle;
  27 import android.widget.Toast;
  28
  29 import org.strongswan.android.R;
  30 import org.strongswan.android.data.VpnProfileDataSource;
  31 import org.strongswan.android.logic.TrustedCertificateManager;
  32
  33 import java.io.FileNotFoundException;
  34 import java.io.InputStream;
  35 import java.security.KeyStore;
  36 import java.security.cert.CertificateException;
  37 import java.security.cert.CertificateFactory;
  38 import java.security.cert.X509Certificate;
  39
  40 import androidx.activity.result.ActivityResultLauncher;
  41 import androidx.activity.result.contract.ActivityResultContracts;
  42 import androidx.appcompat.app.AlertDialog;
  43 import androidx.appcompat.app.AppCompatActivity;
  44 import androidx.appcompat.app.AppCompatDialogFragment;
  45 import androidx.fragment.app.FragmentTransaction;
  46
  47 public class TrustedCertificateImportActivity extends AppCompatActivity
  48 {
  49         private static final String DIALOG_TAG = "Dialog";
  50         private Uri mCertificateUri;
  51
  52         private final ActivityResultLauncher<Intent> mOpenDocument = registerForActivityResult(
  53                 new ActivityResultContracts.StartActivityForResult(),
  54                 result -> {
  55                         if (result.getResultCode() == RESULT_OK && result.getData() != null)
  56                         {
  57                                 mCertificateUri = result.getData().getData();
  58                                 return;
  59                         }
  60                         finish();
  61                 }
  62         );
  63
  64         @TargetApi(Build.VERSION_CODES.KITKAT)
  65         @Override
  66         public void onCreate(Bundle savedInstanceState)
  67         {
  68                 super.onCreate(savedInstanceState);
  69
  70                 if (savedInstanceState != null)
  71                 {       /* do nothing when we are restoring */
  72                         return;
  73                 }
  74
  75                 Intent intent = getIntent();
  76                 String action = intent.getAction();
  77                 if (Intent.ACTION_VIEW.equals(action))
  78                 {
  79                         importCertificate(intent.getData());
  80                 }
  81                 else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
  82                 {
  83                         Intent openIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
  84                         openIntent.setType("*/*");
  85                         try
  86                         {
  87                                 mOpenDocument.launch(openIntent);
  88                         }
  89                         catch (ActivityNotFoundException e)
  90                         {       /* some devices are unable to browse for files */
  91                                 finish();
  92                                 return;
  93                         }
  94                 }
  95         }
  96
  97         @Override
  98         protected void onPostResume()
  99         {
 100                 super.onPostResume();
 101                 if (mCertificateUri != null)
 102                 {
 103                         importCertificate(mCertificateUri);
 104                         mCertificateUri = null;
 105                 }
 106         }
 107
 108         /**
 109          * Import the file pointed to by the given URI as a certificate.
 110          *
 111          * @param uri
 112          */
 113         private void importCertificate(Uri uri)
 114         {
 115                 X509Certificate certificate = parseCertificate(uri);
 116                 if (certificate == null)
 117                 {
 118                         Toast.makeText(this, R.string.cert_import_failed, Toast.LENGTH_LONG).show();
 119                         finish();
 120                         return;
 121                 }
 122                 /* Ask the user whether to import the certificate.  This is particularly
 123                  * necessary because the import activity can be triggered by any app on
 124                  * the system.  Also, if our app is the only one that is registered to
 125                  * open certificate files by MIME type the user would have no idea really
 126                  * where the file was imported just by reading the Toast we display. */
 127                 ConfirmImportDialog dialog = new ConfirmImportDialog();
 128                 Bundle args = new Bundle();
 129                 args.putSerializable(VpnProfileDataSource.KEY_CERTIFICATE, certificate);
 130                 dialog.setArguments(args);
 131                 FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
 132                 ft.add(dialog, DIALOG_TAG);
 133                 ft.commit();
 134         }
 135
 136         /**
 137          * Load the file from the given URI and try to parse it as X.509 certificate.
 138          *
 139          * @param uri
 140          * @return certificate or null
 141          */
 142         private X509Certificate parseCertificate(Uri uri)
 143         {
 144                 X509Certificate certificate = null;
 145                 try
 146                 {
 147                         CertificateFactory factory = CertificateFactory.getInstance("X.509");
 148                         InputStream in = getContentResolver().openInputStream(uri);
 149                         certificate = (X509Certificate)factory.generateCertificate(in);
 150                         /* we don't check whether it's actually a CA certificate or not */
 151                 }
 152                 catch (CertificateException e)
 153                 {
 154                         e.printStackTrace();
 155                 }
 156                 catch (FileNotFoundException e)
 157                 {
 158                         e.printStackTrace();
 159                 }
 160                 return certificate;
 161         }
 162
 163
 164         /**
 165          * Try to store the given certificate in the KeyStore.
 166          *
 167          * @param certificate
 168          * @return whether it was successfully stored
 169          */
 170         private boolean storeCertificate(X509Certificate certificate)
 171         {
 172                 try
 173                 {
 174                         KeyStore store = KeyStore.getInstance("LocalCertificateStore");
 175                         store.load(null, null);
 176                         store.setCertificateEntry(null, certificate);
 177                         TrustedCertificateManager.getInstance().reset();
 178                         return true;
 179                 }
 180                 catch (Exception e)
 181                 {
 182                         e.printStackTrace();
 183                         return false;
 184                 }
 185         }
 186
 187         /**
 188          * Class that displays a confirmation dialog when a certificate should get
 189          * imported. If the user confirms the import we try to store it.
 190          */
 191         public static class ConfirmImportDialog extends AppCompatDialogFragment
 192         {
 193                 @Override
 194                 public Dialog onCreateDialog(Bundle savedInstanceState)
 195                 {
 196                         final X509Certificate certificate;
 197
 198                         certificate = (X509Certificate)getArguments().getSerializable(VpnProfileDataSource.KEY_CERTIFICATE);
 199
 200                         return new AlertDialog.Builder(getActivity())
 201                                 .setIcon(R.mipmap.ic_app)
 202                                 .setTitle(R.string.import_certificate)
 203                                 .setMessage(certificate.getSubjectDN().toString())
 204                                 .setPositiveButton(R.string.import_certificate, new DialogInterface.OnClickListener()
 205                                 {
 206                                         @Override
 207                                         public void onClick(DialogInterface dialog, int whichButton)
 208                                         {
 209                                                 TrustedCertificateImportActivity activity = (TrustedCertificateImportActivity)getActivity();
 210                                                 if (activity.storeCertificate(certificate))
 211                                                 {
 212                                                         Toast.makeText(getActivity(), R.string.cert_imported_successfully, Toast.LENGTH_LONG).show();
 213                                                         getActivity().setResult(RESULT_OK);
 214                                                 }
 215                                                 else
 216                                                 {
 217                                                         Toast.makeText(getActivity(), R.string.cert_import_failed, Toast.LENGTH_LONG).show();
 218                                                 }
 219                                                 getActivity().finish();
 220                                         }
 221                                 })
 222                                 .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener()
 223                                 {
 224                                         @Override
 225                                         public void onClick(DialogInterface dialog, int which)
 226                                         {
 227                                                 getActivity().finish();
 228                                         }
 229                                 }).create();
 230                 }
 231
 232                 @Override
 233                 public void onCancel(DialogInterface dialog)
 234                 {
 235                         getActivity().finish();
 236                 }
 237         }
 238 }