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Commit bd107779 authored by Robin Lee's avatar Robin Lee
Browse files

Forward package removed broadcast to KeyChainService 

Test: Cts Verifier > Security > KeyChain Test
Test: Manually uninstall and reinstalling Chrome
Test: Manually disable KeyChain and then reinstall Chrome
Bug: 35968281
Change-Id: I1692f7042f081d1a743e0e64ea24fe1dbe63192d
parent 229ce701

services/core/java/com/android/server/security/KeyChainSystemService.java

0 → 100644
+109 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 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.server.security;



import android.content.BroadcastReceiver;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.content.pm.PackageManager;

import android.os.Process;

import android.os.UserHandle;

import android.security.IKeyChainService;

import android.util.Slog;



import com.android.server.DeviceIdleController;

import com.android.server.LocalServices;

import com.android.server.SystemService;



/**

 * Service related to {@link android.security.KeyChain}.

 * <p>

 * Most of the implementation of KeyChain is provided by the com.android.keychain app. Until O,

 * this was OK because a system app has roughly the same privileges as the system process.

 * <p>

 * With the introduction of background check, PACKAGE_* broadcasts (_ADDED, _REMOVED, _REPLACED)

 * aren't received when the KeyChain app is in the background, which is bad as it uses those to

 * drive internal cleanup.

 * <p>

 * TODO (b/35968281): take a more sophisticated look at what bits of KeyChain should be inside the

 *                    system server and which make sense inside a system app.

 */

public class KeyChainSystemService extends SystemService {



    private static final String TAG = "KeyChainSystemService";



    /**

     * Maximum time limit for the KeyChain app to deal with packages being removed.

     */

    private static final int KEYCHAIN_IDLE_WHITELIST_DURATION_MS = 30 * 1000;



    public KeyChainSystemService(final Context context) {

        super(context);

    }



    @Override

    public void onStart() {

        IntentFilter packageFilter = new IntentFilter(Intent.ACTION_PACKAGE_REMOVED);

        packageFilter.addDataScheme("package");

        try {

            getContext().registerReceiverAsUser(mPackageReceiver, UserHandle.ALL,

                    packageFilter, null /*broadcastPermission*/, null /*handler*/);

        } catch (RuntimeException e) {

            Slog.w(TAG, "Unable to register for package removed broadcast", e);

        }

    }



    private final BroadcastReceiver mPackageReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(final Context context, final Intent broadcastIntent) {

            if (broadcastIntent.getPackage() != null) {

                return;

            }



            try {

                final Intent intent = new Intent(IKeyChainService.class.getName());

                ComponentName service =

                        intent.resolveSystemService(getContext().getPackageManager(), 0 /*flags*/);

                if (service == null) {

                    return;

                }

                intent.setComponent(service);

                intent.setAction(broadcastIntent.getAction());

                startServiceInBackgroundAsUser(intent, UserHandle.of(getSendingUserId()));

            } catch (RuntimeException e) {

                Slog.e(TAG, "Unable to forward package removed broadcast to KeyChain", e);

            }

        }

    };





    private void startServiceInBackgroundAsUser(final Intent intent, final UserHandle user) {

        if (intent.getComponent() == null) {

            return;

        }



        final String packageName = intent.getComponent().getPackageName();

        final DeviceIdleController.LocalService idleController =

                LocalServices.getService(DeviceIdleController.LocalService.class);

        idleController.addPowerSaveTempWhitelistApp(Process.myUid(), packageName,

                KEYCHAIN_IDLE_WHITELIST_DURATION_MS, user.getIdentifier(), false, "keychain");



        getContext().startServiceAsUser(intent, user);

    }

}

services/java/com/android/server/SystemServer.java

+5 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ import com.android.server.power.ShutdownThread; 
import com.android.server.restrictions.RestrictionsManagerService;

import com.android.server.retaildemo.RetailDemoModeService;

import com.android.server.security.KeyAttestationApplicationIdProviderService;

import com.android.server.security.KeyChainSystemService;

import com.android.server.soundtrigger.SoundTriggerService;

import com.android.server.statusbar.StatusBarManagerService;

import com.android.server.storage.DeviceStorageMonitorService;
@@ -727,6 +728,10 @@ public final class SystemServer { 
                    new KeyAttestationApplicationIdProviderService(context));

            traceEnd();



            traceBeginAndSlog("StartKeyChainSystemService");

            mSystemServiceManager.startService(KeyChainSystemService.class);

            traceEnd();



            traceBeginAndSlog("StartSchedulingPolicyService");

            ServiceManager.addService("scheduling_policy", new SchedulingPolicyService());

            traceEnd();