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
  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                         }
  93                 }
  94         }
  95
  96         @Override
  97         protected void onPostResume()
  98         {
  99                 super.onPostResume();
 100                 if (mCertificateUri != null)
 101                 {
 102                         importCertificate(mCertificateUri);
 103                         mCertificateUri = null;
 104                 }
 105         }
 106
 107         /**
 108          * Import the file pointed to by the given URI as a certificate.
 109          *
 110          * @param uri
 111          */
 112         private void importCertificate(Uri uri)
 113         {
 114                 X509Certificate certificate = parseCertificate(uri);
 115                 if (certificate == null)
 116                 {
 117                         Toast.makeText(this, R.string.cert_import_failed, Toast.LENGTH_LONG).show();
 118                         finish();
 119                         return;
 120                 }
 121                 /* Ask the user whether to import the certificate.  This is particularly
 122                  * necessary because the import activity can be triggered by any app on
 123                  * the system.  Also, if our app is the only one that is registered to
 124                  * open certificate files by MIME type the user would have no idea really
 125                  * where the file was imported just by reading the Toast we display. */
 126                 ConfirmImportDialog dialog = new ConfirmImportDialog();
 127                 Bundle args = new Bundle();
 128                 args.putSerializable(VpnProfileDataSource.KEY_CERTIFICATE, certificate);
 129                 dialog.setArguments(args);
 130                 FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
 131                 ft.add(dialog, DIALOG_TAG);
 132                 ft.commit();
 133         }
 134
 135         /**
 136          * Load the file from the given URI and try to parse it as X.509 certificate.
 137          *
 138          * @param uri
 139          * @return certificate or null
 140          */
 141         private X509Certificate parseCertificate(Uri uri)
 142         {
 143                 X509Certificate certificate = null;
 144                 try
 145                 {
 146                         CertificateFactory factory = CertificateFactory.getInstance("X.509");
 147                         InputStream in = getContentResolver().openInputStream(uri);
 148                         certificate = (X509Certificate)factory.generateCertificate(in);
 149                         /* we don't check whether it's actually a CA certificate or not */
 150                 }
 151                 catch (CertificateException e)
 152                 {
 153                         e.printStackTrace();
 154                 }
 155                 catch (FileNotFoundException e)
 156                 {
 157                         e.printStackTrace();
 158                 }
 159                 return certificate;
 160         }
 161
 162
 163         /**
 164          * Try to store the given certificate in the KeyStore.
 165          *
 166          * @param certificate
 167          * @return whether it was successfully stored
 168          */
 169         private boolean storeCertificate(X509Certificate certificate)
 170         {
 171                 try
 172                 {
 173                         KeyStore store = KeyStore.getInstance("LocalCertificateStore");
 174                         store.load(null, null);
 175                         store.setCertificateEntry(null, certificate);
 176                         TrustedCertificateManager.getInstance().reset();
 177                         return true;
 178                 }
 179                 catch (Exception e)
 180                 {
 181                         e.printStackTrace();
 182                         return false;
 183                 }
 184         }
 185
 186         /**
 187          * Class that displays a confirmation dialog when a certificate should get
 188          * imported. If the user confirms the import we try to store it.
 189          */
 190         public static class ConfirmImportDialog extends AppCompatDialogFragment
 191         {
 192                 @Override
 193                 public Dialog onCreateDialog(Bundle savedInstanceState)
 194                 {
 195                         final X509Certificate certificate;
 196
 197                         certificate = (X509Certificate)getArguments().getSerializable(VpnProfileDataSource.KEY_CERTIFICATE);
 198
 199                         return new AlertDialog.Builder(getActivity())
 200                                 .setIcon(R.mipmap.ic_app)
 201                                 .setTitle(R.string.import_certificate)
 202                                 .setMessage(certificate.getSubjectDN().toString())
 203                                 .setPositiveButton(R.string.import_certificate, new DialogInterface.OnClickListener()
 204                                 {
 205                                         @Override
 206                                         public void onClick(DialogInterface dialog, int whichButton)
 207                                         {
 208                                                 TrustedCertificateImportActivity activity = (TrustedCertificateImportActivity)getActivity();
 209                                                 if (activity.storeCertificate(certificate))
 210                                                 {
 211                                                         Toast.makeText(getActivity(), R.string.cert_imported_successfully, Toast.LENGTH_LONG).show();
 212                                                         getActivity().setResult(RESULT_OK);
 213                                                 }
 214                                                 else
 215                                                 {
 216                                                         Toast.makeText(getActivity(), R.string.cert_import_failed, Toast.LENGTH_LONG).show();
 217                                                 }
 218                                                 getActivity().finish();
 219                                         }
 220                                 })
 221                                 .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener()
 222                                 {
 223                                         @Override
 224                                         public void onClick(DialogInterface dialog, int which)
 225                                         {
 226                                                 getActivity().finish();
 227                                         }
 228                                 }).create();
 229                 }
 230
 231                 @Override
 232                 public void onCancel(DialogInterface dialog)
 233                 {
 234                         getActivity().finish();
 235                 }
 236         }
 237 }