From 256d644d03f989132e9db01e15f75aaee2f76157 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Dominik=20Sch=C3=BCrmann?= Date: Mon, 13 Apr 2015 23:29:35 +0200 Subject: IMplement CryptoInputParcelCacheService --- .../remote/CryptoInputParcelCacheService.java | 246 +++++++++++++++++++++ 1 file changed, 246 insertions(+) create mode 100644 OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/CryptoInputParcelCacheService.java (limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/CryptoInputParcelCacheService.java') diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/CryptoInputParcelCacheService.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/CryptoInputParcelCacheService.java new file mode 100644 index 000000000..e3e39417a --- /dev/null +++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/CryptoInputParcelCacheService.java @@ -0,0 +1,246 @@ +/* + * Copyright (C) 2015 Dominik Schürmann + * + * 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 . + */ + +package org.sufficientlysecure.keychain.remote; + +import android.app.Service; +import android.content.Context; +import android.content.Intent; +import android.os.Binder; +import android.os.Bundle; +import android.os.Handler; +import android.os.HandlerThread; +import android.os.IBinder; +import android.os.Message; +import android.os.Messenger; +import android.os.RemoteException; + +import org.openintents.openpgp.util.OpenPgpApi; +import org.sufficientlysecure.keychain.Constants; +import org.sufficientlysecure.keychain.service.input.CryptoInputParcel; +import org.sufficientlysecure.keychain.util.Log; + +import java.util.UUID; +import java.util.concurrent.ConcurrentHashMap; + + +public class CryptoInputParcelCacheService extends Service { + + public static final String ACTION_ADD = Constants.INTENT_PREFIX + "ADD"; + public static final String ACTION_GET = Constants.INTENT_PREFIX + "GET"; + + public static final String EXTRA_CRYPTO_INPUT_PARCEL = "crypto_input_parcel"; + public static final String EXTRA_UUID1 = "uuid1"; + public static final String EXTRA_UUID2 = "uuid2"; + public static final String EXTRA_MESSENGER = "messenger"; + + private static final int MSG_GET_OKAY = 1; + private static final int MSG_GET_NOT_FOUND = 2; + + Context mContext; + + private static final UUID NULL_UUID = new UUID(0, 0); + + private ConcurrentHashMap mCache = new ConcurrentHashMap<>(); + + public static class InputParcelNotFound extends Exception { + public InputParcelNotFound() { + } + + public InputParcelNotFound(String name) { + super(name); + } + } + + public static void addCryptoInputParcel(Context context, Intent data, CryptoInputParcel inputParcel) { + UUID mTicket = addCryptoInputParcel(context, inputParcel); + // And write out the UUID most and least significant bits. + data.putExtra(OpenPgpApi.EXTRA_CALL_UUID1, mTicket.getMostSignificantBits()); + data.putExtra(OpenPgpApi.EXTRA_CALL_UUID2, mTicket.getLeastSignificantBits()); + } + + public static CryptoInputParcel getCryptoInputParcel(Context context, Intent data) { + if (!data.getExtras().containsKey(OpenPgpApi.EXTRA_CALL_UUID1) + || !data.getExtras().containsKey(OpenPgpApi.EXTRA_CALL_UUID2)) { + return null; + } + long mostSig = data.getLongExtra(OpenPgpApi.EXTRA_CALL_UUID1, 0); + long leastSig = data.getLongExtra(OpenPgpApi.EXTRA_CALL_UUID2, 0); + UUID uuid = new UUID(mostSig, leastSig); + try { + return getCryptoInputParcel(context, uuid); + } catch (InputParcelNotFound inputParcelNotFound) { + return null; + } + } + + private static UUID addCryptoInputParcel(Context context, CryptoInputParcel inputParcel) { + UUID uuid = UUID.randomUUID(); + + Intent intent = new Intent(context, CryptoInputParcelCacheService.class); + intent.setAction(ACTION_ADD); + intent.putExtra(EXTRA_CRYPTO_INPUT_PARCEL, inputParcel); + intent.putExtra(EXTRA_UUID1, uuid.getMostSignificantBits()); + intent.putExtra(EXTRA_UUID2, uuid.getLeastSignificantBits()); + context.startService(intent); + return uuid; + } + + private static CryptoInputParcel getCryptoInputParcel(Context context, UUID uuid) throws InputParcelNotFound { + Intent intent = new Intent(context, CryptoInputParcelCacheService.class); + intent.setAction(ACTION_GET); + + final Object mutex = new Object(); + final Message returnMessage = Message.obtain(); + + HandlerThread handlerThread = new HandlerThread("getParcelableThread"); + handlerThread.start(); + Handler returnHandler = new Handler(handlerThread.getLooper()) { + @Override + public void handleMessage(Message message) { + // copy over result to handle after mutex.wait + returnMessage.what = message.what; + returnMessage.copyFrom(message); + synchronized (mutex) { + mutex.notify(); + } + // quit handlerThread + getLooper().quit(); + } + }; + + // Create a new Messenger for the communication back + Messenger messenger = new Messenger(returnHandler); + intent.putExtra(EXTRA_UUID1, uuid.getMostSignificantBits()); + intent.putExtra(EXTRA_UUID2, uuid.getLeastSignificantBits()); + intent.putExtra(EXTRA_MESSENGER, messenger); + // send intent to this service + context.startService(intent); + + // Wait on mutex until parcelable is returned to handlerThread. Note that this local + // variable is used in the handler closure above, so it does make sense here! + // noinspection SynchronizationOnLocalVariableOrMethodParameter + synchronized (mutex) { + try { + mutex.wait(3000); + } catch (InterruptedException e) { + // don't care + } + } + + switch (returnMessage.what) { + case MSG_GET_OKAY: + Bundle returnData = returnMessage.getData(); + returnData.setClassLoader(context.getClassLoader()); + return returnData.getParcelable(EXTRA_CRYPTO_INPUT_PARCEL); + case MSG_GET_NOT_FOUND: + throw new InputParcelNotFound(); + default: + Log.e(Constants.TAG, "timeout!"); + throw new InputParcelNotFound("should not happen!"); + } + } + + /** + * Executed when service is started by intent + */ + @Override + public int onStartCommand(Intent intent, int flags, int startId) { + + if (intent == null || intent.getAction() == null) { + return START_NOT_STICKY; + } + + String action = intent.getAction(); + switch (action) { + case ACTION_ADD: { + long uuid1 = intent.getLongExtra(EXTRA_UUID1, 0); + long uuid2 = intent.getLongExtra(EXTRA_UUID2, 0); + UUID uuid = new UUID(uuid1, uuid2); + CryptoInputParcel inputParcel = intent.getParcelableExtra(EXTRA_CRYPTO_INPUT_PARCEL); + mCache.put(uuid, inputParcel); + + break; + } + case ACTION_GET: { + long uuid1 = intent.getLongExtra(EXTRA_UUID1, 0); + long uuid2 = intent.getLongExtra(EXTRA_UUID2, 0); + UUID uuid = new UUID(uuid1, uuid2); + Messenger messenger = intent.getParcelableExtra(EXTRA_MESSENGER); + + Message msg = Message.obtain(); + // UUID.equals isn't well documented; we use compareTo instead. + if (NULL_UUID.compareTo(uuid) == 0) { + msg.what = MSG_GET_NOT_FOUND; + } else { + CryptoInputParcel inputParcel = mCache.get(uuid); + mCache.remove(uuid); + msg.what = MSG_GET_OKAY; + Bundle bundle = new Bundle(); + bundle.putParcelable(EXTRA_CRYPTO_INPUT_PARCEL, inputParcel); + msg.setData(bundle); + } + + try { + messenger.send(msg); + } catch (RemoteException e) { + Log.e(Constants.TAG, "CryptoInputParcelCacheService: Sending message failed", e); + } + break; + } + default: { + Log.e(Constants.TAG, "CryptoInputParcelCacheService: Intent or Intent Action not supported!"); + break; + } + } + + if (mCache.size() <= 0) { + // stop whole service if cache is empty + Log.d(Constants.TAG, "CryptoInputParcelCacheService: No passphrases remaining in memory, stopping service!"); + stopSelf(); + } + + return START_NOT_STICKY; + } + + @Override + public void onCreate() { + super.onCreate(); + mContext = this; + Log.d(Constants.TAG, "CryptoInputParcelCacheService, onCreate()"); + } + + @Override + public void onDestroy() { + super.onDestroy(); + Log.d(Constants.TAG, "CryptoInputParcelCacheService, onDestroy()"); + } + + @Override + public IBinder onBind(Intent intent) { + return mBinder; + } + + public class CryptoInputParcelCacheServiceBinder extends Binder { + public CryptoInputParcelCacheService getService() { + return CryptoInputParcelCacheService.this; + } + } + + private final IBinder mBinder = new CryptoInputParcelCacheServiceBinder(); + +} \ No newline at end of file -- cgit v1.2.3