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/*
* Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.ui.dialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager.LayoutParams;
import android.view.inputmethod.EditorInfo;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;
import android.widget.Toast;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.compatibility.DialogFragmentWorkaround;
import org.sufficientlysecure.keychain.pgp.CachedSecretKey;
import org.sufficientlysecure.keychain.pgp.CachedSecretKeyRing;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.service.PassphraseCacheService;
import org.sufficientlysecure.keychain.util.Log;
public class PassphraseDialogFragment extends DialogFragment implements OnEditorActionListener {
private static final String ARG_MESSENGER = "messenger";
private static final String ARG_SECRET_KEY_ID = "secret_key_id";
public static final int MESSAGE_OKAY = 1;
public static final int MESSAGE_CANCEL = 2;
public static final String MESSAGE_DATA_PASSPHRASE = "passphrase";
private Messenger mMessenger;
private EditText mPassphraseEditText;
private boolean mCanKB;
/**
* Shows passphrase dialog to cache a new passphrase the user enters for using it later for
* encryption. Based on mSecretKeyId it asks for a passphrase to open a private key or it asks
* for a symmetric passphrase
*/
public static void show(final FragmentActivity context, final long keyId, final Handler returnHandler) {
// Create a new Messenger for the communication back
final Messenger messenger = new Messenger(returnHandler);
DialogFragmentWorkaround.INTERFACE.runnableRunDelayed(new Runnable() {
public void run() {
try {
PassphraseDialogFragment passphraseDialog = PassphraseDialogFragment.newInstance(context,
messenger, keyId);
passphraseDialog.show(context.getSupportFragmentManager(), "passphraseDialog");
} catch (PgpGeneralException e) {
Log.d(Constants.TAG, "No passphrase for this secret key!");
// send message to handler to start encryption directly
returnHandler.sendEmptyMessage(PassphraseDialogFragment.MESSAGE_OKAY);
}
}
});
}
/**
* Creates new instance of this dialog fragment
*
* @param secretKeyId secret key id you want to use
* @param messenger to communicate back after caching the passphrase
* @return
* @throws PgpGeneralException
*/
public static PassphraseDialogFragment newInstance(Context context, Messenger messenger,
long secretKeyId) throws PgpGeneralException {
// check if secret key has a passphrase
if (!(secretKeyId == Constants.key.symmetric || secretKeyId == Constants.key.none)) {
try {
if (new ProviderHelper(context).getCachedSecretKeyRing(secretKeyId).hasPassphrase()) {
throw new PgpGeneralException("No passphrase! No passphrase dialog needed!");
}
} catch(ProviderHelper.NotFoundException e) {
throw new PgpGeneralException("Error: Key not found!", e);
}
}
PassphraseDialogFragment frag = new PassphraseDialogFragment();
Bundle args = new Bundle();
args.putLong(ARG_SECRET_KEY_ID, secretKeyId);
args.putParcelable(ARG_MESSENGER, messenger);
frag.setArguments(args);
return frag;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
/**
* Creates dialog
*/
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Activity activity = getActivity();
final long secretKeyId = getArguments().getLong(ARG_SECRET_KEY_ID);
mMessenger = getArguments().getParcelable(ARG_MESSENGER);
AlertDialog.Builder alert = new AlertDialog.Builder(activity);
alert.setTitle(R.string.title_authentication);
final CachedSecretKeyRing secretRing;
final String userId;
if (secretKeyId == Constants.key.symmetric || secretKeyId == Constants.key.none) {
secretRing = null;
alert.setMessage(R.string.passphrase_for_symmetric_encryption);
} else {
try {
ProviderHelper helper = new ProviderHelper(activity);
secretRing = helper.getCachedSecretKeyRing(secretKeyId);
userId = secretRing.getPrimaryUserId();
} catch (ProviderHelper.NotFoundException e) {
alert.setTitle(R.string.title_key_not_found);
alert.setMessage(getString(R.string.key_not_found, secretKeyId));
alert.setPositiveButton(android.R.string.ok, new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dismiss();
}
});
alert.setCancelable(false);
mCanKB = false;
return alert.create();
}
Log.d(Constants.TAG, "User id: '" + userId + "'");
alert.setMessage(getString(R.string.passphrase_for, userId));
}
LayoutInflater inflater = activity.getLayoutInflater();
View view = inflater.inflate(R.layout.passphrase_dialog, null);
alert.setView(view);
mPassphraseEditText = (EditText) view.findViewById(R.id.passphrase_passphrase);
alert.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
dismiss();
String passphrase = mPassphraseEditText.getText().toString();
// Early breakout if we are dealing with a symmetric key
if (secretRing == null) {
PassphraseCacheService.addCachedPassphrase(activity, Constants.key.symmetric, passphrase);
// also return passphrase back to activity
Bundle data = new Bundle();
data.putString(MESSAGE_DATA_PASSPHRASE, passphrase);
sendMessageToHandler(MESSAGE_OKAY, data);
return;
}
CachedSecretKey unlockedSecretKey = null;
for(CachedSecretKey clickSecretKey : secretRing.iterator()) {
try {
boolean unlocked = clickSecretKey.unlock(passphrase);
if (unlocked) {
unlockedSecretKey = clickSecretKey;
break;
}
} catch (PgpGeneralException e) {
Toast.makeText(activity, R.string.error_could_not_extract_private_key,
Toast.LENGTH_SHORT).show();
sendMessageToHandler(MESSAGE_CANCEL);
return; // ran out of keys to try
}
}
// Means we got an exception every time
if (unlockedSecretKey == null) {
Toast.makeText(activity, R.string.wrong_passphrase,
Toast.LENGTH_SHORT).show();
sendMessageToHandler(MESSAGE_CANCEL);
return;
}
long masterKeyId = secretRing.getMasterKeyId();
// cache the new passphrase
Log.d(Constants.TAG, "Everything okay! Caching entered passphrase");
PassphraseCacheService.addCachedPassphrase(activity, masterKeyId, passphrase);
if (unlockedSecretKey.getKeyId() != masterKeyId) {
PassphraseCacheService.addCachedPassphrase(
activity, unlockedSecretKey.getKeyId(), passphrase);
}
// also return passphrase back to activity
Bundle data = new Bundle();
data.putString(MESSAGE_DATA_PASSPHRASE, passphrase);
sendMessageToHandler(MESSAGE_OKAY, data);
}
});
alert.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
mCanKB = true;
return alert.create();
}
@Override
public void onActivityCreated(Bundle arg0) {
super.onActivityCreated(arg0);
if (mCanKB) {
// request focus and open soft keyboard
mPassphraseEditText.requestFocus();
getDialog().getWindow().setSoftInputMode(LayoutParams.SOFT_INPUT_STATE_VISIBLE);
mPassphraseEditText.setOnEditorActionListener(this);
}
}
@Override
public void onCancel(DialogInterface dialog) {
super.onCancel(dialog);
dismiss();
sendMessageToHandler(MESSAGE_CANCEL);
}
/**
* Associate the "done" button on the soft keyboard with the okay button in the view
*/
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (EditorInfo.IME_ACTION_DONE == actionId) {
AlertDialog dialog = ((AlertDialog) getDialog());
Button bt = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
bt.performClick();
return true;
}
return false;
}
/**
* Send message back to handler which is initialized in a activity
*
* @param what Message integer you want to send
*/
private void sendMessageToHandler(Integer what) {
Message msg = Message.obtain();
msg.what = what;
try {
mMessenger.send(msg);
} catch (RemoteException e) {
Log.w(Constants.TAG, "Exception sending message, Is handler present?", e);
} catch (NullPointerException e) {
Log.w(Constants.TAG, "Messenger is null!", e);
}
}
/**
* Send message back to handler which is initialized in a activity
*
* @param what Message integer you want to send
*/
private void sendMessageToHandler(Integer what, Bundle data) {
Message msg = Message.obtain();
msg.what = what;
if (data != null) {
msg.setData(data);
}
try {
mMessenger.send(msg);
} catch (RemoteException e) {
Log.w(Constants.TAG, "Exception sending message, Is handler present?", e);
} catch (NullPointerException e) {
Log.w(Constants.TAG, "Messenger is null!", e);
}
}
}
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