274 lines
10 KiB
Java
274 lines
10 KiB
Java
/*
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* Copyright (C) 2012 Dominik Schürmann <dominik@dominikschuermann.de>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.thialfihar.android.apg.ui.dialog;
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import org.spongycastle.openpgp.PGPException;
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import org.spongycastle.openpgp.PGPPrivateKey;
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import org.spongycastle.openpgp.PGPSecretKey;
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import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
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import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
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import org.thialfihar.android.apg.helper.PGPHelper;
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import org.thialfihar.android.apg.helper.PGPMain;
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import org.thialfihar.android.apg.helper.PGPMain.ApgGeneralException;
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import org.thialfihar.android.apg.Constants;
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import org.thialfihar.android.apg.Id;
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import org.thialfihar.android.apg.R;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.app.Dialog;
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import android.content.Context;
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import android.content.DialogInterface;
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import android.content.DialogInterface.OnClickListener;
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import android.os.Bundle;
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import android.os.Message;
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import android.os.Messenger;
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import android.os.RemoteException;
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import android.support.v4.app.DialogFragment;
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import org.thialfihar.android.apg.provider.ProviderHelper;
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import org.thialfihar.android.apg.service.PassphraseCacheService;
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import org.thialfihar.android.apg.util.Log;
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import android.view.KeyEvent;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.WindowManager.LayoutParams;
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import android.view.inputmethod.EditorInfo;
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import android.widget.Button;
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import android.widget.EditText;
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import android.widget.TextView;
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import android.widget.TextView.OnEditorActionListener;
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import android.widget.Toast;
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public class PassphraseDialogFragment extends DialogFragment implements OnEditorActionListener {
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private Messenger mMessenger;
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private static final String ARG_MESSENGER = "messenger";
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private static final String ARG_SECRET_KEY_ID = "secret_key_id";
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public static final int MESSAGE_OKAY = 1;
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private EditText mPassphraseEditText;
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/**
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* Creates new instance of this dialog fragment
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*
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* @param secretKeyId
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* secret key id you want to use
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* @param messenger
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* to communicate back after caching the passphrase
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* @return
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* @throws ApgGeneralException
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*/
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public static PassphraseDialogFragment newInstance(Context context, Messenger messenger,
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long secretKeyId) throws ApgGeneralException {
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// check if secret key has a passphrase
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if (!(secretKeyId == Id.key.symmetric || secretKeyId == Id.key.none)) {
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if (!hasPassphrase(context, secretKeyId)) {
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throw new PGPMain.ApgGeneralException("No passphrase! No passphrase dialog needed!");
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}
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}
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PassphraseDialogFragment frag = new PassphraseDialogFragment();
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Bundle args = new Bundle();
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args.putLong(ARG_SECRET_KEY_ID, secretKeyId);
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args.putParcelable(ARG_MESSENGER, messenger);
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frag.setArguments(args);
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return frag;
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}
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/**
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* Checks if key has a passphrase
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*
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* @param secretKeyId
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* @return true if it has a passphrase
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*/
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private static boolean hasPassphrase(Context context, long secretKeyId) {
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// check if the key has no passphrase
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try {
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// TODO: by master key id???
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PGPSecretKey secretKey = PGPHelper.getMasterKey(ProviderHelper
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.getPGPSecretKeyRingByMasterKeyId(context, secretKeyId));
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// PGPSecretKey secretKey =
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// PGPHelper.getMasterKey(PGPMain.getSecretKeyRing(secretKeyId));
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Log.d(Constants.TAG, "Check if key has no passphrase...");
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PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
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"SC").build("".toCharArray());
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PGPPrivateKey testKey = secretKey.extractPrivateKey(keyDecryptor);
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if (testKey != null) {
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Log.d(Constants.TAG, "Key has no passphrase! Caches empty passphrase!");
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// cache empty passphrase
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PassphraseCacheService.addCachedPassphrase(context, secretKey.getKeyID(), "");
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return false;
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}
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} catch (PGPException e) {
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// silently catch
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}
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return true;
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}
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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}
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/**
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* Creates dialog
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*/
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@Override
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public Dialog onCreateDialog(Bundle savedInstanceState) {
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final Activity activity = getActivity();
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long secretKeyId = getArguments().getLong(ARG_SECRET_KEY_ID);
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mMessenger = getArguments().getParcelable(ARG_MESSENGER);
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AlertDialog.Builder alert = new AlertDialog.Builder(activity);
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alert.setTitle(R.string.title_authentication);
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final PGPSecretKey secretKey;
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if (secretKeyId == Id.key.symmetric || secretKeyId == Id.key.none) {
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secretKey = null;
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alert.setMessage(R.string.passPhraseForSymmetricEncryption);
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} else {
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// TODO: by master key id???
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secretKey = PGPHelper.getMasterKey(ProviderHelper.getPGPSecretKeyRingByMasterKeyId(
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activity, secretKeyId));
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// secretKey = PGPHelper.getMasterKey(PGPMain.getSecretKeyRing(secretKeyId));
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if (secretKey == null) {
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alert.setTitle(R.string.title_keyNotFound);
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alert.setMessage(getString(R.string.keyNotFound, secretKeyId));
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alert.setPositiveButton(android.R.string.ok, new OnClickListener() {
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public void onClick(DialogInterface dialog, int which) {
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dismiss();
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}
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});
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alert.setCancelable(false);
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return alert.create();
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}
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String userId = PGPHelper.getMainUserIdSafe(activity, secretKey);
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Log.d(Constants.TAG, "User id: '" + userId + "'");
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alert.setMessage(getString(R.string.passPhraseFor, userId));
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}
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LayoutInflater inflater = activity.getLayoutInflater();
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View view = inflater.inflate(R.layout.passphrase, null);
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alert.setView(view);
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mPassphraseEditText = (EditText) view.findViewById(R.id.passphrase_passphrase);
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alert.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface dialog, int id) {
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dismiss();
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String passPhrase = mPassphraseEditText.getText().toString();
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long keyId;
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if (secretKey != null) {
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try {
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PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder()
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.setProvider(PGPMain.BOUNCY_CASTLE_PROVIDER_NAME).build(
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passPhrase.toCharArray());
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PGPPrivateKey testKey = secretKey.extractPrivateKey(keyDecryptor);
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if (testKey == null) {
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Toast.makeText(activity, R.string.error_couldNotExtractPrivateKey,
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Toast.LENGTH_SHORT).show();
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return;
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}
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} catch (PGPException e) {
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Toast.makeText(activity, R.string.wrongPassPhrase, Toast.LENGTH_SHORT)
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.show();
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return;
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}
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keyId = secretKey.getKeyID();
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} else {
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keyId = Id.key.symmetric;
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}
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// cache the new passphrase
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Log.d(Constants.TAG, "Everything okay! Caching entered passphrase");
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PassphraseCacheService.addCachedPassphrase(activity, keyId, passPhrase);
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sendMessageToHandler(MESSAGE_OKAY);
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}
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});
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alert.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface dialog, int id) {
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dismiss();
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}
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});
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return alert.create();
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}
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@Override
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public void onActivityCreated(Bundle arg0) {
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super.onActivityCreated(arg0);
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// request focus and open soft keyboard
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mPassphraseEditText.requestFocus();
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getDialog().getWindow().setSoftInputMode(LayoutParams.SOFT_INPUT_STATE_VISIBLE);
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mPassphraseEditText.setOnEditorActionListener(this);
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}
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/**
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* Associate the "done" button on the soft keyboard with the okay button in the view
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*/
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@Override
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public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
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if (EditorInfo.IME_ACTION_DONE == actionId) {
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AlertDialog dialog = ((AlertDialog) getDialog());
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Button bt = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
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bt.performClick();
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return true;
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}
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return false;
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}
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/**
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* Send message back to handler which is initialized in a activity
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*
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* @param what
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* Message integer you want to send
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*/
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private void sendMessageToHandler(Integer what) {
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Message msg = Message.obtain();
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msg.what = what;
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try {
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mMessenger.send(msg);
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} catch (RemoteException e) {
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Log.w(Constants.TAG, "Exception sending message, Is handler present?", e);
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} catch (NullPointerException e) {
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Log.w(Constants.TAG, "Messenger is null!", e);
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}
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}
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} |