368 lines
16 KiB
Java
368 lines
16 KiB
Java
/*
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* Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.ui;
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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.Intent;
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import android.os.AsyncTask;
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import android.os.Bundle;
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import android.os.Messenger;
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import android.support.v4.app.DialogFragment;
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import android.support.v4.app.FragmentActivity;
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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;
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import android.view.inputmethod.EditorInfo;
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import android.view.inputmethod.InputMethodManager;
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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.Toast;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.R;
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import org.sufficientlysecure.keychain.compatibility.DialogFragmentWorkaround;
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import org.sufficientlysecure.keychain.pgp.CanonicalizedSecretKey;
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import org.sufficientlysecure.keychain.pgp.CanonicalizedSecretKeyRing;
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import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
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import org.sufficientlysecure.keychain.provider.CachedPublicKeyRing;
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import org.sufficientlysecure.keychain.provider.KeychainContract;
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import org.sufficientlysecure.keychain.provider.ProviderHelper;
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import org.sufficientlysecure.keychain.service.PassphraseCacheService;
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import org.sufficientlysecure.keychain.ui.dialog.CustomAlertDialogBuilder;
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import org.sufficientlysecure.keychain.util.Log;
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/**
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* We can not directly create a dialog on the application context.
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* This activity encapsulates a DialogFragment to emulate a dialog.
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*/
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public class PassphraseDialogActivity extends FragmentActivity {
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public static final String MESSAGE_DATA_PASSPHRASE = "passphrase";
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public static final String EXTRA_SECRET_KEY_ID = "secret_key_id";
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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// do not allow screenshots of passphrase input
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// to prevent "too easy" passphrase theft by root apps
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if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) {
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getWindow().setFlags(
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WindowManager.LayoutParams.FLAG_SECURE,
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WindowManager.LayoutParams.FLAG_SECURE
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);
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}
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// this activity itself has no content view (see manifest)
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long keyId = getIntent().getLongExtra(EXTRA_SECRET_KEY_ID, 0);
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show(this, keyId);
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}
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/**
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* Shows passphrase dialog to cache a new passphrase the user enters for using it later for
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* encryption. Based on mSecretKeyId it asks for a passphrase to open a private key or it asks
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* for a symmetric passphrase
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*/
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public static void show(final FragmentActivity context, final long keyId) {
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DialogFragmentWorkaround.INTERFACE.runnableRunDelayed(new Runnable() {
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public void run() {
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// do NOT check if the key even needs a passphrase. that's not our job here.
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PassphraseDialogFragment frag = new PassphraseDialogFragment();
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Bundle args = new Bundle();
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args.putLong(EXTRA_SECRET_KEY_ID, keyId);
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frag.setArguments(args);
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frag.show(context.getSupportFragmentManager(), "passphraseDialog");
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}
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});
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}
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public static class PassphraseDialogFragment extends DialogFragment implements TextView.OnEditorActionListener {
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private Messenger mMessenger;
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private EditText mPassphraseEditText;
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private View mInput, mProgress;
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CanonicalizedSecretKeyRing mSecretRing = null;
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boolean mIsCancelled = false;
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long mSubKeyId;
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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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mSubKeyId = getArguments().getLong(EXTRA_SECRET_KEY_ID);
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CustomAlertDialogBuilder alert = new CustomAlertDialogBuilder(activity);
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alert.setTitle(R.string.title_authentication);
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String userId;
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if (mSubKeyId == Constants.key.symmetric || mSubKeyId == Constants.key.none) {
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alert.setMessage(R.string.passphrase_for_symmetric_encryption);
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} else {
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String message;
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try {
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ProviderHelper helper = new ProviderHelper(activity);
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mSecretRing = helper.getCanonicalizedSecretKeyRing(
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KeychainContract.KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(mSubKeyId));
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// yes the inner try/catch block is necessary, otherwise the final variable
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// above can't be statically verified to have been set in all cases because
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// the catch clause doesn't return.
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try {
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userId = mSecretRing.getPrimaryUserIdWithFallback();
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} catch (PgpGeneralException e) {
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userId = null;
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}
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/* Get key type for message */
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// find a master key id for our key
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long masterKeyId = new ProviderHelper(getActivity()).getMasterKeyId(mSubKeyId);
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CachedPublicKeyRing keyRing = new ProviderHelper(getActivity()).getCachedPublicKeyRing(masterKeyId);
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// get the type of key (from the database)
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CanonicalizedSecretKey.SecretKeyType keyType = keyRing.getSecretKeyType(mSubKeyId);
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switch (keyType) {
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case PASSPHRASE:
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message = getString(R.string.passphrase_for, userId);
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break;
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case DIVERT_TO_CARD:
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message = getString(R.string.yubikey_pin, userId);
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break;
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default:
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message = "This should not happen!";
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break;
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}
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} catch (ProviderHelper.NotFoundException e) {
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alert.setTitle(R.string.title_key_not_found);
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alert.setMessage(getString(R.string.key_not_found, mSubKeyId));
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alert.setPositiveButton(android.R.string.ok, new DialogInterface.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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alert.setMessage(message);
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}
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LayoutInflater inflater = activity.getLayoutInflater();
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View view = inflater.inflate(R.layout.passphrase_dialog, null);
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alert.setView(view);
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mPassphraseEditText = (EditText) view.findViewById(R.id.passphrase_passphrase);
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mInput = view.findViewById(R.id.input);
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mProgress = view.findViewById(R.id.progress);
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alert.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
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@Override
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public void onClick(DialogInterface dialog, int id) {
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dialog.cancel();
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}
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});
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// Hack to open keyboard.
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// This is the only method that I found to work across all Android versions
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// http://turbomanage.wordpress.com/2012/05/02/show-soft-keyboard-automatically-when-edittext-receives-focus/
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// Notes: * onCreateView can't be used because we want to add buttons to the dialog
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// * opening in onActivityCreated does not work on Android 4.4
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mPassphraseEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
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@Override
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public void onFocusChange(View v, boolean hasFocus) {
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mPassphraseEditText.post(new Runnable() {
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@Override
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public void run() {
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InputMethodManager imm = (InputMethodManager) getActivity()
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.getSystemService(Context.INPUT_METHOD_SERVICE);
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imm.showSoftInput(mPassphraseEditText, InputMethodManager.SHOW_IMPLICIT);
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}
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});
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}
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});
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mPassphraseEditText.requestFocus();
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mPassphraseEditText.setImeActionLabel(getString(android.R.string.ok), EditorInfo.IME_ACTION_DONE);
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mPassphraseEditText.setOnEditorActionListener(this);
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AlertDialog dialog = alert.create();
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dialog.setButton(DialogInterface.BUTTON_POSITIVE,
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activity.getString(android.R.string.ok), (DialogInterface.OnClickListener) null);
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return dialog;
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}
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@Override
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public void onStart() {
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super.onStart();
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// Override the default behavior so the dialog is NOT dismissed on click
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final Button positive = ((AlertDialog) getDialog()).getButton(DialogInterface.BUTTON_POSITIVE);
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positive.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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final String passphrase = mPassphraseEditText.getText().toString();
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// Early breakout if we are dealing with a symmetric key
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if (mSecretRing == null) {
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PassphraseCacheService.addCachedPassphrase(getActivity(), Constants.key.symmetric,
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passphrase, getString(R.string.passp_cache_notif_pwd));
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// also return passphrase back to activity
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Intent returnIntent = new Intent();
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returnIntent.putExtra(MESSAGE_DATA_PASSPHRASE, passphrase);
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getActivity().setResult(RESULT_OK, returnIntent);
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dismiss();
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getActivity().finish();
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return;
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}
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mInput.setVisibility(View.GONE);
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mProgress.setVisibility(View.VISIBLE);
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positive.setEnabled(false);
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new AsyncTask<Void, Void, Boolean>() {
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@Override
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protected Boolean doInBackground(Void... params) {
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try {
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// wait some 100ms here, give the user time to appreciate the progress bar
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try {
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Thread.sleep(100);
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} catch (InterruptedException e) {
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// never mind
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}
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// make sure this unlocks
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return mSecretRing.getSecretKey(mSubKeyId).unlock(passphrase);
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} catch (PgpGeneralException e) {
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Toast.makeText(getActivity(), R.string.error_could_not_extract_private_key,
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Toast.LENGTH_SHORT).show();
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getActivity().setResult(RESULT_CANCELED);
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dismiss();
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getActivity().finish();
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return false;
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}
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}
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/** Handle a good or bad passphrase. This happens in the UI thread! */
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@Override
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protected void onPostExecute(Boolean result) {
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super.onPostExecute(result);
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// if we were cancelled in the meantime, the result isn't relevant anymore
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if (mIsCancelled) {
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return;
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}
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// if the passphrase was wrong, reset and re-enable the dialogue
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if (!result) {
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mPassphraseEditText.setText("");
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mPassphraseEditText.setError(getString(R.string.wrong_passphrase));
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mInput.setVisibility(View.VISIBLE);
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mProgress.setVisibility(View.GONE);
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positive.setEnabled(true);
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return;
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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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try {
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PassphraseCacheService.addCachedPassphrase(getActivity(), mSubKeyId,
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passphrase, mSecretRing.getPrimaryUserIdWithFallback());
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} catch (PgpGeneralException e) {
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Log.e(Constants.TAG, "adding of a passphrase failed", e);
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}
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// also return passphrase back to activity
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Intent returnIntent = new Intent();
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returnIntent.putExtra(MESSAGE_DATA_PASSPHRASE, passphrase);
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getActivity().setResult(RESULT_OK, returnIntent);
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dismiss();
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getActivity().finish();
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}
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}.execute();
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}
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});
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}
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@Override
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public void onCancel(DialogInterface dialog) {
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super.onCancel(dialog);
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// note we need no synchronization here, this variable is only accessed in the ui thread
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mIsCancelled = true;
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// dismiss the dialogue
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getActivity().setResult(RESULT_CANCELED);
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dismiss();
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getActivity().finish();
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}
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@Override
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public void onDismiss(DialogInterface dialog) {
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super.onDismiss(dialog);
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Log.d(Constants.TAG, "onDismiss");
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// hide keyboard on dismiss
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hideKeyboard();
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}
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private void hideKeyboard() {
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InputMethodManager inputManager = (InputMethodManager) getActivity()
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.getSystemService(Context.INPUT_METHOD_SERVICE);
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//check if no view has focus:
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View v = getActivity().getCurrentFocus();
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if (v == null)
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return;
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inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0);
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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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}
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