355 lines
12 KiB
Java
355 lines
12 KiB
Java
/*
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* Copyright (C) 2013 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.service.remote;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.concurrent.ArrayBlockingQueue;
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import java.util.concurrent.TimeUnit;
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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.provider.KeychainContract;
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import org.sufficientlysecure.keychain.provider.ProviderHelper;
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import org.sufficientlysecure.keychain.service.exception.WrongPackageSignatureException;
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import org.sufficientlysecure.keychain.util.Log;
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import org.sufficientlysecure.keychain.util.PausableThreadPoolExecutor;
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import android.app.Service;
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import android.content.Context;
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import android.content.Intent;
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import android.content.pm.PackageInfo;
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import android.content.pm.PackageManager;
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import android.content.pm.PackageManager.NameNotFoundException;
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import android.content.pm.Signature;
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import android.net.Uri;
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import android.os.Binder;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import android.os.Messenger;
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/**
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* Abstract service class for remote APIs that handle app registration and user input.
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*/
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public abstract class RemoteService extends Service {
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Context mContext;
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private final ArrayBlockingQueue<Runnable> mPoolQueue = new ArrayBlockingQueue<Runnable>(100);
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// TODO: Are these parameters okay?
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private PausableThreadPoolExecutor mThreadPool = new PausableThreadPoolExecutor(2, 4, 10,
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TimeUnit.SECONDS, mPoolQueue);
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private final Object userInputLock = new Object();
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/**
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* Override handleUserInput() to handle OKAY (1) and CANCEL (0). After handling the waiting
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* threads will be notified and the queue resumed
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*/
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protected class UserInputCallback extends BaseCallback {
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public void handleUserInput(Message msg) {
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}
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@Override
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public boolean handleMessage(Message msg) {
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handleUserInput(msg);
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// resume
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synchronized (userInputLock) {
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userInputLock.notifyAll();
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}
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mThreadPool.resume();
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return true;
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}
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}
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/**
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* Extends Handler.Callback with OKAY (1), CANCEL (0) variables
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*/
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private class BaseCallback implements Handler.Callback {
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public static final int OKAY = 1;
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public static final int CANCEL = 0;
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@Override
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public boolean handleMessage(Message msg) {
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return false;
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}
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}
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public Context getContext() {
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return mContext;
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}
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/**
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* Should be used from Stub implementations of AIDL interfaces to enqueue a runnable for
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* execution
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*
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* @param r
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*/
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protected void checkAndEnqueue(Runnable r) {
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try {
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if (isCallerAllowed(false)) {
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mThreadPool.execute(r);
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Log.d(Constants.TAG, "Enqueued runnable…");
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} else {
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String[] callingPackages = getPackageManager().getPackagesForUid(
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Binder.getCallingUid());
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// TODO: currently simply uses first entry
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String packageName = callingPackages[0];
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byte[] packageSignature;
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try {
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packageSignature = getPackageSignature(packageName);
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} catch (NameNotFoundException e) {
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Log.e(Constants.TAG, "Should not happen, returning!", e);
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return;
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}
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Log.e(Constants.TAG,
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"Not allowed to use service! Starting activity for registration!");
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Bundle extras = new Bundle();
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extras.putString(RemoteServiceActivity.EXTRA_PACKAGE_NAME, packageName);
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extras.putByteArray(RemoteServiceActivity.EXTRA_PACKAGE_SIGNATURE, packageSignature);
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RegisterActivityCallback callback = new RegisterActivityCallback();
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pauseAndStartUserInteraction(RemoteServiceActivity.ACTION_REGISTER, callback,
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extras);
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if (callback.isAllowed()) {
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mThreadPool.execute(r);
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Log.d(Constants.TAG, "Enqueued runnable…");
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} else {
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Log.d(Constants.TAG, "User disallowed app!");
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}
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}
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} catch (WrongPackageSignatureException e) {
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Log.e(Constants.TAG, e.getMessage());
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Bundle extras = new Bundle();
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extras.putString(RemoteServiceActivity.EXTRA_ERROR_MESSAGE,
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getString(R.string.api_error_wrong_signature));
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pauseAndStartUserInteraction(RemoteServiceActivity.ACTION_ERROR_MESSAGE, null, extras);
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}
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}
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private byte[] getPackageSignature(String packageName) throws NameNotFoundException {
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PackageInfo pkgInfo = getPackageManager().getPackageInfo(packageName,
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PackageManager.GET_SIGNATURES);
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Signature[] signatures = pkgInfo.signatures;
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// TODO: Only first signature?!
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byte[] packageSignature = signatures[0].toByteArray();
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return packageSignature;
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}
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/**
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* Locks current thread and pauses execution of runnables and starts activity for user input
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*
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* @param action
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* @param messenger
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* @param extras
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*/
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protected void pauseAndStartUserInteraction(String action, BaseCallback callback, Bundle extras) {
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synchronized (userInputLock) {
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mThreadPool.pause();
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Log.d(Constants.TAG, "starting activity...");
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Intent intent = new Intent(getBaseContext(), RemoteServiceActivity.class);
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intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
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intent.setAction(action);
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Messenger messenger = new Messenger(new Handler(getMainLooper(), callback));
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extras.putParcelable(RemoteServiceActivity.EXTRA_MESSENGER, messenger);
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intent.putExtras(extras);
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startActivity(intent);
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// lock current thread for user input
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try {
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userInputLock.wait();
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} catch (InterruptedException e) {
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Log.e(Constants.TAG, "CryptoService", e);
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}
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}
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}
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/**
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* Retrieves AppSettings from database for the application calling this remote service
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*
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* @return
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*/
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protected AppSettings getAppSettings() {
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String[] callingPackages = getPackageManager().getPackagesForUid(Binder.getCallingUid());
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// get app settings for this package
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for (int i = 0; i < callingPackages.length; i++) {
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String currentPkg = callingPackages[i];
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Uri uri = KeychainContract.ApiApps.buildByPackageNameUri(currentPkg);
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AppSettings settings = ProviderHelper.getApiAppSettings(this, uri);
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if (settings != null)
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return settings;
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}
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return null;
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}
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class RegisterActivityCallback extends BaseCallback {
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public static final String PACKAGE_NAME = "package_name";
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private boolean allowed = false;
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private String packageName;
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public boolean isAllowed() {
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return allowed;
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}
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public String getPackageName() {
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return packageName;
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}
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@Override
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public boolean handleMessage(Message msg) {
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if (msg.arg1 == OKAY) {
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allowed = true;
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packageName = msg.getData().getString(PACKAGE_NAME);
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// resume threads
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try {
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if (isPackageAllowed(packageName)) {
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synchronized (userInputLock) {
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userInputLock.notifyAll();
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}
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mThreadPool.resume();
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} else {
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// Should not happen!
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Log.e(Constants.TAG, "Should not happen! Emergency shutdown!");
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mThreadPool.shutdownNow();
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}
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} catch (WrongPackageSignatureException e) {
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Log.e(Constants.TAG, e.getMessage());
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Bundle extras = new Bundle();
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extras.putString(RemoteServiceActivity.EXTRA_ERROR_MESSAGE,
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getString(R.string.api_error_wrong_signature));
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pauseAndStartUserInteraction(RemoteServiceActivity.ACTION_ERROR_MESSAGE, null,
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extras);
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}
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} else {
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allowed = false;
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synchronized (userInputLock) {
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userInputLock.notifyAll();
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}
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mThreadPool.resume();
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}
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return true;
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}
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}
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/**
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* Checks if process that binds to this service (i.e. the package name corresponding to the
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* process) is in the list of allowed package names.
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*
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* @param allowOnlySelf
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* allow only Keychain app itself
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* @return true if process is allowed to use this service
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* @throws WrongPackageSignatureException
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*/
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private boolean isCallerAllowed(boolean allowOnlySelf) throws WrongPackageSignatureException {
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return isUidAllowed(Binder.getCallingUid(), allowOnlySelf);
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}
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private boolean isUidAllowed(int uid, boolean allowOnlySelf)
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throws WrongPackageSignatureException {
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if (android.os.Process.myUid() == uid) {
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return true;
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}
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if (allowOnlySelf) { // barrier
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return false;
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}
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String[] callingPackages = getPackageManager().getPackagesForUid(uid);
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// is calling package allowed to use this service?
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for (int i = 0; i < callingPackages.length; i++) {
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String currentPkg = callingPackages[i];
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if (isPackageAllowed(currentPkg)) {
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return true;
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}
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}
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Log.d(Constants.TAG, "Caller is NOT allowed!");
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return false;
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}
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/**
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* Checks if packageName is a registered app for the API. Does not return true for own package!
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*
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* @param packageName
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* @return
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* @throws WrongPackageSignatureException
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*/
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private boolean isPackageAllowed(String packageName) throws WrongPackageSignatureException {
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Log.d(Constants.TAG, "packageName: " + packageName);
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ArrayList<String> allowedPkgs = ProviderHelper.getRegisteredApiApps(this);
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Log.d(Constants.TAG, "allowed: " + allowedPkgs);
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// check if package is allowed to use our service
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if (allowedPkgs.contains(packageName)) {
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Log.d(Constants.TAG, "Package is allowed! packageName: " + packageName);
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// check package signature
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byte[] currentSig;
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try {
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currentSig = getPackageSignature(packageName);
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} catch (NameNotFoundException e) {
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throw new WrongPackageSignatureException(e.getMessage());
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}
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byte[] storedSig = ProviderHelper.getApiAppSignature(this, packageName);
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if (Arrays.equals(currentSig, storedSig)) {
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Log.d(Constants.TAG,
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"Package signature is correct! (equals signature from database)");
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return true;
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} else {
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throw new WrongPackageSignatureException(
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"PACKAGE NOT ALLOWED! Signature wrong! (Signature not equals signature from database)");
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}
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}
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return false;
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}
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@Override
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public void onCreate() {
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super.onCreate();
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mContext = this;
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}
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}
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