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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package com.android.dialer.simulator.service;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.os.Binder;
import android.os.IBinder;
import android.os.Process;
import android.os.RemoteException;
import android.support.annotation.Nullable;
import com.android.dialer.simulator.impl.SimulatorMainPortal;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* A secured android service that gives clients simulator api access through binder if clients do
* have registered certificates.
*/
public class SimulatorService extends Service {
private static final String POPULATE_DATABASE = "Populate database";
private static final String CLEAN_DATABASE = "Clean database";
private static final String ENABLE_SIMULATOR_MODE = "Enable simulator mode";
private static final String DISABLE_SIMULATOR_MODE = "Disable simulator mode";
private static final String VOICECALL = "VoiceCall";
private static final String NOTIFICATIONS = "Notifications";
private static final String CUSTOMIZED_INCOMING_CALL = "Customized incoming call";
private static final String CUSTOMIZED_OUTGOING_CALL = "Customized outgoing call";
private static final String INCOMING_ENRICHED_CALL = "Incoming enriched call";
private static final String OUTGOING_ENRICHED_CALL = "Outgoing enriched call";
private static final String MISSED_CALL = "Missed calls (few)";
// Certificates that used for checking whether a client is a trusted client.
// To get a hashed certificate
private ImmutableList<String> certificates;
private SimulatorMainPortal simulatorMainPortal;
/**
* The implementation of {@link ISimulatorService} that contains logic for clients to call
* simulator api.
*/
private final ISimulatorService.Stub binder =
new ISimulatorService.Stub() {
@Override
public void makeIncomingCall(String callerId, int presentation) {
doSecurityCheck(
() -> {
simulatorMainPortal.setCallerId(callerId);
simulatorMainPortal.setPresentation(presentation);
simulatorMainPortal.execute(new String[] {VOICECALL, CUSTOMIZED_INCOMING_CALL});
});
}
@Override
public void makeOutgoingCall(String callerId, int presentation) {
doSecurityCheck(
() -> {
simulatorMainPortal.setCallerId(callerId);
simulatorMainPortal.setPresentation(presentation);
simulatorMainPortal.execute(new String[] {VOICECALL, CUSTOMIZED_OUTGOING_CALL});
});
}
@Override
public void populateDataBase() throws RemoteException {
doSecurityCheck(
() -> {
simulatorMainPortal.execute(new String[] {POPULATE_DATABASE});
});
}
@Override
public void cleanDataBase() throws RemoteException {
doSecurityCheck(
() -> {
simulatorMainPortal.execute(new String[] {CLEAN_DATABASE});
});
}
@Override
public void enableSimulatorMode() throws RemoteException {
doSecurityCheck(
() -> {
simulatorMainPortal.execute(new String[] {ENABLE_SIMULATOR_MODE});
});
}
@Override
public void disableSimulatorMode() throws RemoteException {
doSecurityCheck(
() -> {
simulatorMainPortal.execute(new String[] {DISABLE_SIMULATOR_MODE});
});
}
@Override
public void makeIncomingEnrichedCall() throws RemoteException {
doSecurityCheck(
() -> {
simulatorMainPortal.execute(new String[] {VOICECALL, INCOMING_ENRICHED_CALL});
});
}
@Override
public void makeOutgoingEnrichedCall() throws RemoteException {
doSecurityCheck(
() -> {
simulatorMainPortal.execute(new String[] {VOICECALL, OUTGOING_ENRICHED_CALL});
});
}
@Override
public void populateMissedCall(int num) throws RemoteException {
doSecurityCheck(
() -> {
simulatorMainPortal.setMissedCallNum(num);
simulatorMainPortal.execute(new String[] {NOTIFICATIONS, MISSED_CALL});
});
}
private void doSecurityCheck(Runnable runnable) {
if (!hasAccessToService()) {
throw new RuntimeException("Client doesn't have access to Simulator service!");
}
runnable.run();
}
};
/** Sets SimulatorMainPortal instance for SimulatorService. */
public void setSimulatorMainPortal(SimulatorMainPortal simulatorMainPortal) {
this.simulatorMainPortal = simulatorMainPortal;
}
/** Sets immutable CertificatesList for SimulatorService. */
public void setCertificatesList(ImmutableList<String> certificates) {
this.certificates = certificates;
}
private boolean hasAccessToService() {
int clientPid = Binder.getCallingPid();
if (clientPid == Process.myPid()) {
throw new RuntimeException("Client and service have the same PID!");
}
Optional<String> packageName = getPackageNameForPid(clientPid);
if (packageName.isPresent()) {
try {
PackageInfo packageInfo =
getPackageManager().getPackageInfo(packageName.get(), PackageManager.GET_SIGNATURES);
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
if (packageInfo.signatures.length != 1) {
throw new NotOnlyOneSignatureException("The client has more than one signature!");
}
Signature signature = packageInfo.signatures[0];
return isCertificateValid(messageDigest.digest(signature.toByteArray()), this.certificates);
} catch (NameNotFoundException | NoSuchAlgorithmException | NotOnlyOneSignatureException e) {
throw new RuntimeException(e);
}
}
return false;
}
private Optional<String> getPackageNameForPid(int pid) {
ActivityManager activityManager =
(ActivityManager) this.getSystemService(Context.ACTIVITY_SERVICE);
for (RunningAppProcessInfo processInfo : activityManager.getRunningAppProcesses()) {
if (processInfo.pid == pid) {
return Optional.of(processInfo.processName);
}
}
return Optional.absent();
}
private static boolean isCertificateValid(
byte[] clientCerfificate, ImmutableList<String> certificates) {
for (String certificate : certificates) {
if (certificate.equals(bytesToHexString(clientCerfificate))) {
return true;
}
}
return false;
}
private static String bytesToHexString(byte[] in) {
final StringBuilder builder = new StringBuilder();
for (byte b : in) {
builder.append(String.format("%02X", b));
}
return builder.toString();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return binder;
}
private static class NotOnlyOneSignatureException extends Exception {
public NotOnlyOneSignatureException(String desc) {
super(desc);
}
}
}
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