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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.internal.app;
     18 
     19 import static android.content.pm.PackageManager.MATCH_DEFAULT_ONLY;
     20 
     21 import android.app.Activity;
     22 import android.app.ActivityManager;
     23 import android.app.ActivityThread;
     24 import android.app.AppGlobals;
     25 import android.app.admin.DevicePolicyManager;
     26 import android.content.Context;
     27 import android.content.Intent;
     28 import android.content.pm.IPackageManager;
     29 import android.content.pm.UserInfo;
     30 import android.os.Bundle;
     31 import android.os.RemoteException;
     32 import android.os.UserHandle;
     33 import android.os.UserManager;
     34 import android.util.Slog;
     35 import android.widget.Toast;
     36 
     37 import java.util.List;
     38 
     39 /**
     40  * This is used in conjunction with
     41  * {@link DevicePolicyManager#addCrossProfileIntentFilter} to enable intents to
     42  * be passed in and out of a managed profile.
     43  */
     44 public class IntentForwarderActivity extends Activity  {
     45 
     46     public static String TAG = "IntentForwarderActivity";
     47 
     48     public static String FORWARD_INTENT_TO_PARENT
     49             = "com.android.internal.app.ForwardIntentToParent";
     50 
     51     public static String FORWARD_INTENT_TO_MANAGED_PROFILE
     52             = "com.android.internal.app.ForwardIntentToManagedProfile";
     53 
     54     @Override
     55     protected void onCreate(Bundle savedInstanceState) {
     56         super.onCreate(savedInstanceState);
     57         Intent intentReceived = getIntent();
     58 
     59         String className = intentReceived.getComponent().getClassName();
     60         final int targetUserId;
     61         final int userMessageId;
     62 
     63         if (className.equals(FORWARD_INTENT_TO_PARENT)) {
     64             userMessageId = com.android.internal.R.string.forward_intent_to_owner;
     65             targetUserId = getProfileParent();
     66         } else if (className.equals(FORWARD_INTENT_TO_MANAGED_PROFILE)) {
     67             userMessageId = com.android.internal.R.string.forward_intent_to_work;
     68             targetUserId = getManagedProfile();
     69         } else {
     70             Slog.wtf(TAG, IntentForwarderActivity.class.getName() + " cannot be called directly");
     71             userMessageId = -1;
     72             targetUserId = UserHandle.USER_NULL;
     73         }
     74         if (targetUserId == UserHandle.USER_NULL) {
     75             // This covers the case where there is no parent / managed profile.
     76             finish();
     77             return;
     78         }
     79         Intent newIntent = new Intent(intentReceived);
     80         newIntent.setComponent(null);
     81         // Apps should not be allowed to target a specific package in the target user.
     82         newIntent.setPackage(null);
     83         newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT
     84                 |Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
     85         int callingUserId = getUserId();
     86 
     87         if (canForward(newIntent, targetUserId)) {
     88             if (Intent.ACTION_CHOOSER.equals(newIntent.getAction())) {
     89                 Intent innerIntent = (Intent) newIntent.getParcelableExtra(Intent.EXTRA_INTENT);
     90                 // At this point, innerIntent is not null. Otherwise, canForward would have returned
     91                 // false.
     92                 innerIntent.prepareToLeaveUser(callingUserId);
     93             } else {
     94                 newIntent.prepareToLeaveUser(callingUserId);
     95             }
     96 
     97             final android.content.pm.ResolveInfo ri = getPackageManager().resolveActivityAsUser(
     98                         newIntent, MATCH_DEFAULT_ONLY, targetUserId);
     99 
    100             // Don't show the disclosure if next activity is ResolverActivity or ChooserActivity
    101             // as those will already have shown work / personal as neccesary etc.
    102             final boolean shouldShowDisclosure = ri == null || ri.activityInfo == null ||
    103                     !"android".equals(ri.activityInfo.packageName) ||
    104                     !(ResolverActivity.class.getName().equals(ri.activityInfo.name)
    105                     || ChooserActivity.class.getName().equals(ri.activityInfo.name));
    106 
    107             try {
    108                 startActivityAsCaller(newIntent, null, false, targetUserId);
    109             } catch (RuntimeException e) {
    110                 int launchedFromUid = -1;
    111                 String launchedFromPackage = "?";
    112                 try {
    113                     launchedFromUid = ActivityManager.getService().getLaunchedFromUid(
    114                             getActivityToken());
    115                     launchedFromPackage = ActivityManager.getService().getLaunchedFromPackage(
    116                             getActivityToken());
    117                 } catch (RemoteException ignored) {
    118                 }
    119 
    120                 Slog.wtf(TAG, "Unable to launch as UID " + launchedFromUid + " package "
    121                         + launchedFromPackage + ", while running in "
    122                         + ActivityThread.currentProcessName(), e);
    123             }
    124 
    125             if (shouldShowDisclosure) {
    126                 Toast.makeText(this, getString(userMessageId), Toast.LENGTH_LONG).show();
    127             }
    128         } else {
    129             Slog.wtf(TAG, "the intent: " + newIntent + " cannot be forwarded from user "
    130                     + callingUserId + " to user " + targetUserId);
    131         }
    132         finish();
    133     }
    134 
    135     boolean canForward(Intent intent, int targetUserId)  {
    136         IPackageManager ipm = AppGlobals.getPackageManager();
    137         if (Intent.ACTION_CHOOSER.equals(intent.getAction())) {
    138             // The EXTRA_INITIAL_INTENTS may not be allowed to be forwarded.
    139             if (intent.hasExtra(Intent.EXTRA_INITIAL_INTENTS)) {
    140                 Slog.wtf(TAG, "An chooser intent with extra initial intents cannot be forwarded to"
    141                         + " a different user");
    142                 return false;
    143             }
    144             if (intent.hasExtra(Intent.EXTRA_REPLACEMENT_EXTRAS)) {
    145                 Slog.wtf(TAG, "A chooser intent with replacement extras cannot be forwarded to a"
    146                         + " different user");
    147                 return false;
    148             }
    149             intent = (Intent) intent.getParcelableExtra(Intent.EXTRA_INTENT);
    150             if (intent == null) {
    151                 Slog.wtf(TAG, "Cannot forward a chooser intent with no extra "
    152                         + Intent.EXTRA_INTENT);
    153                 return false;
    154             }
    155         }
    156         String resolvedType = intent.resolveTypeIfNeeded(getContentResolver());
    157         if (intent.getSelector() != null) {
    158             intent = intent.getSelector();
    159         }
    160         try {
    161             return ipm.canForwardTo(intent, resolvedType, getUserId(),
    162                     targetUserId);
    163         } catch (RemoteException e) {
    164             Slog.e(TAG, "PackageManagerService is dead?");
    165             return false;
    166         }
    167     }
    168 
    169     /**
    170      * Returns the userId of the managed profile for this device or UserHandle.USER_NULL if there is
    171      * no managed profile.
    172      *
    173      * TODO: Remove the assumption that there is only one managed profile
    174      * on the device.
    175      */
    176     private int getManagedProfile() {
    177         UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
    178         List<UserInfo> relatedUsers = userManager.getProfiles(UserHandle.myUserId());
    179         for (UserInfo userInfo : relatedUsers) {
    180             if (userInfo.isManagedProfile()) return userInfo.id;
    181         }
    182         Slog.wtf(TAG, FORWARD_INTENT_TO_MANAGED_PROFILE
    183                 + " has been called, but there is no managed profile");
    184         return UserHandle.USER_NULL;
    185     }
    186 
    187     /**
    188      * Returns the userId of the profile parent or UserHandle.USER_NULL if there is
    189      * no parent.
    190      */
    191     private int getProfileParent() {
    192         UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
    193         UserInfo parent = userManager.getProfileParent(UserHandle.myUserId());
    194         if (parent == null) {
    195             Slog.wtf(TAG, FORWARD_INTENT_TO_PARENT
    196                     + " has been called, but there is no parent");
    197             return UserHandle.USER_NULL;
    198         }
    199         return parent.id;
    200     }
    201 }
    202