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

   1 /*
   2  * Copyright (C) 2014 Tobias Brunner
   3  * HSR Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 package org.strongswan.android.ui;
  17
  18 import android.annotation.TargetApi;
  19 import android.app.Activity;
  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.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 int OPEN_DOCUMENT = 0;
  48         private static final String DIALOG_TAG = "Dialog";
  49         private Uri mCertificateUri;
  50
  51         @TargetApi(Build.VERSION_CODES.KITKAT)
  52         @Override
  53         public void onCreate(Bundle savedInstanceState)
  54         {
  55                 super.onCreate(savedInstanceState);
  56
  57                 if (savedInstanceState != null)
  58                 {       /* do nothing when we are restoring */
  59                         return;
  60                 }
  61
  62                 Intent intent = getIntent();
  63                 String action = intent.getAction();
  64                 if (Intent.ACTION_VIEW.equals(action))
  65                 {
  66                         importCertificate(intent.getData());
  67                 }
  68                 else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
  69                 {
  70                         Intent openIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
  71                         openIntent.setType("*/*");
  72                         try
  73                         {
  74                                 startActivityForResult(openIntent, OPEN_DOCUMENT);
  75                         }
  76                         catch (ActivityNotFoundException e)
  77                         {       /* some devices are unable to browse for files */
  78                                 finish();
  79                                 return;
  80                         }
  81                 }
  82         }
  83
  84         @Override
  85         protected void onActivityResult(int requestCode, int resultCode, Intent data)
  86         {
  87                 super.onActivityResult(requestCode, resultCode, data);
  88                 switch (requestCode)
  89                 {
  90                         case OPEN_DOCUMENT:
  91                                 if (resultCode == Activity.RESULT_OK && data != null)
  92                                 {
  93                                         mCertificateUri = data.getData();
  94                                         return;
  95                                 }
  96                                 finish();
  97                                 return;
  98                 }
  99         }
 100
 101         @Override
 102         protected void onPostResume()
 103         {
 104                 super.onPostResume();
 105                 if (mCertificateUri != null)
 106                 {
 107                         importCertificate(mCertificateUri);
 108                         mCertificateUri = null;
 109                 }
 110         }
 111
 112         /**
 113          * Import the file pointed to by the given URI as a certificate.
 114          *
 115          * @param uri
 116          */
 117         private void importCertificate(Uri uri)
 118         {
 119                 X509Certificate certificate = parseCertificate(uri);
 120                 if (certificate == null)
 121                 {
 122                         Toast.makeText(this, R.string.cert_import_failed, Toast.LENGTH_LONG).show();
 123                         finish();
 124                         return;
 125                 }
 126                 /* Ask the user whether to import the certificate.  This is particularly
 127                  * necessary because the import activity can be triggered by any app on
 128                  * the system.  Also, if our app is the only one that is registered to
 129                  * open certificate files by MIME type the user would have no idea really
 130                  * where the file was imported just by reading the Toast we display. */
 131                 ConfirmImportDialog dialog = new ConfirmImportDialog();
 132                 Bundle args = new Bundle();
 133                 args.putSerializable(VpnProfileDataSource.KEY_CERTIFICATE, certificate);
 134                 dialog.setArguments(args);
 135                 FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
 136                 ft.add(dialog, DIALOG_TAG);
 137                 ft.commit();
 138         }
 139
 140         /**
 141          * Load the file from the given URI and try to parse it as X.509 certificate.
 142          *
 143          * @param uri
 144          * @return certificate or null
 145          */
 146         private X509Certificate parseCertificate(Uri uri)
 147         {
 148                 X509Certificate certificate = null;
 149                 try
 150                 {
 151                         CertificateFactory factory = CertificateFactory.getInstance("X.509");
 152                         InputStream in = getContentResolver().openInputStream(uri);
 153                         certificate = (X509Certificate)factory.generateCertificate(in);
 154                         /* we don't check whether it's actually a CA certificate or not */
 155                 }
 156                 catch (CertificateException e)
 157                 {
 158                         e.printStackTrace();
 159                 }
 160                 catch (FileNotFoundException e)
 161                 {
 162                         e.printStackTrace();
 163                 }
 164                 return certificate;
 165         }
 166
 167
 168         /**
 169          * Try to store the given certificate in the KeyStore.
 170          *
 171          * @param certificate
 172          * @return whether it was successfully stored
 173          */
 174         private boolean storeCertificate(X509Certificate certificate)
 175         {
 176                 try
 177                 {
 178                         KeyStore store = KeyStore.getInstance("LocalCertificateStore");
 179                         store.load(null, null);
 180                         store.setCertificateEntry(null, certificate);
 181                         TrustedCertificateManager.getInstance().reset();
 182                         return true;
 183                 }
 184                 catch (Exception e)
 185                 {
 186                         e.printStackTrace();
 187                         return false;
 188                 }
 189         }
 190
 191         /**
 192          * Class that displays a confirmation dialog when a certificate should get
 193          * imported. If the user confirms the import we try to store it.
 194          */
 195         public static class ConfirmImportDialog extends AppCompatDialogFragment
 196         {
 197                 @Override
 198                 public Dialog onCreateDialog(Bundle savedInstanceState)
 199                 {
 200                         final X509Certificate certificate;
 201
 202                         certificate = (X509Certificate)getArguments().getSerializable(VpnProfileDataSource.KEY_CERTIFICATE);
 203
 204                         return new AlertDialog.Builder(getActivity())
 205                                 .setIcon(R.drawable.ic_launcher)
 206                                 .setTitle(R.string.import_certificate)
 207                                 .setMessage(certificate.getSubjectDN().toString())
 208                                 .setPositiveButton(R.string.import_certificate, new DialogInterface.OnClickListener()
 209                                 {
 210                                         @Override
 211                                         public void onClick(DialogInterface dialog, int whichButton)
 212                                         {
 213                                                 TrustedCertificateImportActivity activity = (TrustedCertificateImportActivity)getActivity();
 214                                                 if (activity.storeCertificate(certificate))
 215                                                 {
 216                                                         Toast.makeText(getActivity(), R.string.cert_imported_successfully, Toast.LENGTH_LONG).show();
 217                                                         getActivity().setResult(Activity.RESULT_OK);
 218                                                 }
 219                                                 else
 220                                                 {
 221                                                         Toast.makeText(getActivity(), R.string.cert_import_failed, Toast.LENGTH_LONG).show();
 222                                                 }
 223                                                 getActivity().finish();
 224                                         }
 225                                 })
 226                                 .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener()
 227                                 {
 228                                         @Override
 229                                         public void onClick(DialogInterface dialog, int which)
 230                                         {
 231                                                 getActivity().finish();
 232                                         }
 233                                 }).create();
 234                 }
 235
 236                 @Override
 237                 public void onCancel(DialogInterface dialog)
 238                 {
 239                         getActivity().finish();
 240                 }
 241         }
 242 }