mirror of
https://github.com/etesync/android
synced 2024-11-25 17:38:13 +00:00
Remote IPC - Add basic impelmantation
* Add service with AIDL file which can be connected to * Add UI for granting permission
This commit is contained in:
Tal Hacohen
parent
af04b2fa45
commit
7de2484c74
@ -234,6 +234,22 @@
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<activity android:name=".ui.WebViewActivity" />
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<activity
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android:name=".remote.RemoteRegisterActivity"
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android:theme="@style/AppTheme.Dialog.Alert"
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android:launchMode="singleInstance"/>
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<service
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android:name=".remote.RemoteService"
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android:enabled="true"
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android:exported="true"
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tools:ignore="ExportedService">
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<intent-filter>
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<action android:name="com.etesync.syncadapter.RemoteService" />
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</intent-filter>
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</service>
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<provider
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android:name="android.support.v4.content.FileProvider"
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android:authorities="@string/authority_log_provider"
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@ -0,0 +1,11 @@
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// IEteSyncService.aidl
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package com.etesync.syncadapter;
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// Declare any non-default types here with import statements
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interface IEteSyncService {
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boolean hasPermission(String journalType);
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void requestPermission(String journalType);
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}
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@ -0,0 +1,187 @@
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package com.etesync.syncadapter.remote;
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/*
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* Copyright (C) 2013-2015 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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import android.annotation.SuppressLint;
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import android.content.Context;
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import android.content.SharedPreferences;
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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.os.Binder;
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import com.etesync.syncadapter.App;
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import com.etesync.syncadapter.utils.Base64;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.Arrays;
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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 class ApiPermissionHelper {
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private static final String FILE_API = "file_api_";
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private final Context mContext;
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private PackageManager mPackageManager;
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public ApiPermissionHelper(Context context) {
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mContext = context;
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mPackageManager = context.getPackageManager();
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}
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public static class WrongPackageCertificateException extends Exception {
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private static final long serialVersionUID = -8294642703122196028L;
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public WrongPackageCertificateException(String message) {
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super(message);
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}
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}
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/**
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* Returns true iff the caller is allowed, or false on any type of problem.
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* This method should only be used in cases where error handling is dealt with separately.
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*/
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public boolean isAllowedIgnoreErrors(String journalType) {
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try {
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return isCallerAllowed(journalType);
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} catch (WrongPackageCertificateException e) {
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return false;
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}
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}
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private static byte[] getPackageCertificate(Context context, String packageName) throws NameNotFoundException {
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@SuppressLint("PackageManagerGetSignatures") // we do check the byte array of *all* signatures
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PackageInfo pkgInfo = context.getPackageManager().getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
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// NOTE: Silly Android API naming: Signatures are actually certificates
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Signature[] certificates = pkgInfo.signatures;
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ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
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for (Signature cert : certificates) {
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try {
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outputStream.write(cert.toByteArray());
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} catch (IOException e) {
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throw new RuntimeException("Should not happen! Writing ByteArrayOutputStream to concat certificates failed");
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}
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}
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// Even if an apk has several certificates, these certificates should never change
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// Google Play does not allow the introduction of new certificates into an existing apk
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// Also see this attack: http://stackoverflow.com/a/10567852
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return outputStream.toByteArray();
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}
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/**
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* Returns package name associated with the UID, which is assigned to the process that sent you the
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* current transaction that is being processed :)
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*
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* @return package name
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*/
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protected String getCurrentCallingPackage() {
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String[] callingPackages = mPackageManager.getPackagesForUid(Binder.getCallingUid());
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// NOTE: No support for sharedUserIds
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// callingPackages contains more than one entry when sharedUserId has been used
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// No plans to support sharedUserIds due to many bugs connected to them:
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// http://java-hamster.blogspot.de/2010/05/androids-shareduserid.html
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String currentPkg = callingPackages[0];
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App.log.info("currentPkg: " + currentPkg);
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return currentPkg;
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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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* @return true if process is allowed to use this service
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* @throws WrongPackageCertificateException
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*/
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public boolean isCallerAllowed(String journalType) throws WrongPackageCertificateException {
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return isUidAllowed(Binder.getCallingUid(), journalType);
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}
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private boolean isUidAllowed(int uid, String journalType)
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throws WrongPackageCertificateException {
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String[] callingPackages = mPackageManager.getPackagesForUid(uid);
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// is calling package allowed to use this service?
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for (String currentPkg : callingPackages) {
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if (isPackageAllowed(currentPkg, journalType)) {
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return true;
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}
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}
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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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* @throws WrongPackageCertificateException
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*/
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public boolean isPackageAllowed(String packageName, String journalType) throws WrongPackageCertificateException {
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byte[] storedPackageCert = getCertificate(mContext, packageName, journalType);
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boolean isKnownPackage = storedPackageCert != null;
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if (!isKnownPackage) {
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App.log.warning("Package is NOT allowed! packageName: " + packageName + " for journal type " + journalType);
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return false;
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}
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App.log.info("Package is allowed! packageName: " + packageName + " for journal type " + journalType);
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byte[] currentPackageCert;
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try {
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currentPackageCert = getPackageCertificate(mContext, packageName);
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} catch (NameNotFoundException e) {
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throw new WrongPackageCertificateException(e.getMessage());
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}
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boolean packageCertMatchesStored = Arrays.equals(currentPackageCert, storedPackageCert);
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if (packageCertMatchesStored) {
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App.log.info("Package certificate matches expected.");
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return true;
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}
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throw new WrongPackageCertificateException("PACKAGE NOT ALLOWED DUE TO CERTIFICATE MISMATCH!");
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}
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public static void addCertificate(Context context, String packageName, String journalType) {
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SharedPreferences sharedPref = context.getSharedPreferences(FILE_API,
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Context.MODE_PRIVATE);
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try {
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sharedPref.edit().putString(getEncodedName(packageName, journalType),
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Base64.encodeToString(getPackageCertificate(context, packageName), Base64.DEFAULT)).apply();
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App.log.info("Adding permission for package:" + packageName + " for journal type " + journalType);
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} catch (NameNotFoundException aE) {
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aE.printStackTrace();
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}
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}
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private static byte[] getCertificate(Context context, String packageName, String journalType) {
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SharedPreferences sharedPref = context.getSharedPreferences(FILE_API,
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Context.MODE_PRIVATE);
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String cert = sharedPref.getString(getEncodedName(packageName, journalType), null);
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return cert == null ? null : Base64.decode(cert, Base64.DEFAULT);
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}
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private static String getEncodedName(String packageName, String journalType) {
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return packageName + "." + journalType;
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}
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}
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@ -0,0 +1,60 @@
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package com.etesync.syncadapter.remote;
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import android.content.Context;
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import android.content.Intent;
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import android.os.Bundle;
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import android.support.v7.app.AppCompatActivity;
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import android.view.View;
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import android.widget.TextView;
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import android.widget.Toast;
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import com.etesync.syncadapter.R;
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/**
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* Created by tal on 13/04/17.
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*/
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public class RemoteRegisterActivity extends AppCompatActivity {
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private static final String KEY_PACKAGE = "package_name";
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private static final String KEY_JOURNAL_TYPE = "journal_type";
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public static void startActivity(Context context, String packageName, String journalType) {
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Intent intent = new Intent(context, RemoteRegisterActivity.class);
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intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
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intent.putExtra(KEY_PACKAGE, packageName);
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intent.putExtra(KEY_JOURNAL_TYPE, journalType);
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context.startActivity(intent);
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}
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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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setContentView(R.layout.activity_remote_register);
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setTitle(R.string.api_register_title);
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final String packageName = getIntent().getStringExtra(KEY_PACKAGE);
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final String journalType = getIntent().getStringExtra(KEY_JOURNAL_TYPE);
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((TextView) findViewById(R.id.api_register_text))
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.setText(String.format(getString(R.string.api_register_text), packageName, journalType));
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(findViewById(R.id.button_cancel)).setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View aView) {
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Toast.makeText(RemoteRegisterActivity.this, R.string.api_permission_not_granted, Toast.LENGTH_SHORT).show();
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finish();
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}
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});
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(findViewById(R.id.button_allow)).setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View aView) {
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Toast.makeText(RemoteRegisterActivity.this, R.string.api_permission_granted, Toast.LENGTH_SHORT).show();
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ApiPermissionHelper.addCertificate(RemoteRegisterActivity.this, packageName, journalType);
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finish();
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}
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});
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}
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}
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@ -0,0 +1,54 @@
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/*
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* Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the GNU Public License v3.0
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* which accompanies this distribution, and is available at
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* http://www.gnu.org/licenses/gpl.html
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*/
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package com.etesync.syncadapter.remote;
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import android.app.Service;
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import android.content.Intent;
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import android.os.IBinder;
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import android.os.RemoteException;
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import com.etesync.syncadapter.IEteSyncService;
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public class RemoteService extends Service {
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private ApiPermissionHelper mApiPermissionHelper;
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private final IEteSyncService.Stub mBinder = new IEteSyncService.Stub() {
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@Override
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public boolean hasPermission(String journalType) throws RemoteException {
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if (journalType == null || journalType.isEmpty()) return false;
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return mApiPermissionHelper.isAllowedIgnoreErrors(journalType);
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}
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@Override
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public void requestPermission(String journalType) throws RemoteException {
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if (journalType == null || journalType.isEmpty()) return;
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if (mApiPermissionHelper.isAllowedIgnoreErrors(journalType)) return;
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RemoteRegisterActivity.startActivity(RemoteService.this,
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mApiPermissionHelper.getCurrentCallingPackage(), journalType);
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}
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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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mApiPermissionHelper = new ApiPermissionHelper(this);
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}
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@Override
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public int onStartCommand(Intent intent, int flags, int startId) {
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return START_NOT_STICKY;
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}
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@Override
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public IBinder onBind(Intent intent) {
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return mBinder;
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}
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}
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44
app/src/main/res/layout/activity_remote_register.xml
Normal file
44
app/src/main/res/layout/activity_remote_register.xml
Normal file
@ -0,0 +1,44 @@
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:orientation="vertical"
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android:paddingBottom="16dp"
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android:paddingLeft="24dp"
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android:paddingRight="24dp"
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android:paddingTop="24dp">
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<TextView
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android:id="@+id/api_register_text"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="20dp"
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android:gravity="center_vertical"
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android:textAppearance="?android:attr/textAppearanceSmall"
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/>
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<LinearLayout
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:gravity="end"
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android:orientation="horizontal">
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<Button
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android:id="@+id/button_cancel"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/api_register_disallow"
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/>
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<Button
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android:id="@+id/button_allow"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/api_register_allow"/>
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</LinearLayout>
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</LinearLayout>
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@ -327,6 +327,13 @@
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<string name="import_button_local">From Account</string>
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<string name="import_select_account">Select Account</string>
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<!-- Event (from Etar) -->
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<!-- Remote register -->
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<string name="api_register_title">"Allow access to EteSync?"</string>
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<string name="api_register_text" formatted="false">"%s requests to access your account for %s. This will allow the app to modify your account"</string>
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<string name="api_register_allow">"Allow access"</string>
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<string name="api_register_disallow">"Disallow access"</string>
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<string name="api_permission_not_granted">Permission not granted.</string>
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<string name="api_permission_granted">Permission granted</string>
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<string name="event_info_organizer">Organizer:</string>
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</resources>
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