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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.ActivityManagerNative;
     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.Process;
     32 import android.os.RemoteException;
     33 import android.os.UserHandle;
     34 import android.os.UserManager;
     35 import android.util.Slog;
     36 import android.widget.Toast;
     37 
     38 import java.util.List;
     39 
     40 /**
     41  * This is used in conjunction with
     42  * {@link DevicePolicyManager#addCrossProfileIntentFilter} to enable intents to
     43  * be passed in and out of a managed profile.
     44  */
     45 public class IntentForwarderActivity extends Activity  {
     46 
     47     public static String TAG = "IntentForwarderActivity";
     48 
     49     public static String FORWARD_INTENT_TO_USER_OWNER
     50             = "com.android.internal.app.ForwardIntentToUserOwner";
     51 
     52     public static String FORWARD_INTENT_TO_MANAGED_PROFILE
     53             = "com.android.internal.app.ForwardIntentToManagedProfile";
     54 
     55     @Override
     56     protected void onCreate(Bundle savedInstanceState) {
     57         super.onCreate(savedInstanceState);
     58         Intent intentReceived = getIntent();
     59 
     60         String className = intentReceived.getComponent().getClassName();
     61         final int targetUserId;
     62         final int userMessageId;
     63 
     64         if (className.equals(FORWARD_INTENT_TO_USER_OWNER)) {
     65             userMessageId = com.android.internal.R.string.forward_intent_to_owner;
     66             targetUserId = UserHandle.USER_OWNER;
     67         } else if (className.equals(FORWARD_INTENT_TO_MANAGED_PROFILE)) {
     68             userMessageId = com.android.internal.R.string.forward_intent_to_work;
     69             targetUserId = getManagedProfile();
     70         } else {
     71             Slog.wtf(TAG, IntentForwarderActivity.class.getName() + " cannot be called directly");
     72             userMessageId = -1;
     73             targetUserId = UserHandle.USER_NULL;
     74         }
     75         if (targetUserId == UserHandle.USER_NULL) {
     76             // This covers the case where there is no managed profile.
     77             finish();
     78             return;
     79         }
     80         Intent newIntent = new Intent(intentReceived);
     81         newIntent.setComponent(null);
     82         // Apps should not be allowed to target a specific package in the target user.
     83         newIntent.setPackage(null);
     84         newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT
     85                 |Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
     86         int callingUserId = getUserId();
     87 
     88         if (canForward(newIntent, targetUserId)) {
     89             if (newIntent.getAction().equals(Intent.ACTION_CHOOSER)) {
     90                 Intent innerIntent = (Intent) newIntent.getParcelableExtra(Intent.EXTRA_INTENT);
     91                 innerIntent.setContentUserHint(callingUserId);
     92             } else {
     93                 newIntent.setContentUserHint(callingUserId);
     94             }
     95 
     96             final android.content.pm.ResolveInfo ri = getPackageManager().resolveActivityAsUser(
     97                         newIntent, MATCH_DEFAULT_ONLY, targetUserId);
     98 
     99             // Don't show the disclosure if next activity is ResolverActivity or ChooserActivity
    100             // as those will already have shown work / personal as neccesary etc.
    101             final boolean shouldShowDisclosure = ri == null || ri.activityInfo == null ||
    102                     !"android".equals(ri.activityInfo.packageName) ||
    103                     !(ResolverActivity.class.getName().equals(ri.activityInfo.name)
    104                     || ChooserActivity.class.getName().equals(ri.activityInfo.name));
    105 
    106             try {
    107                 startActivityAsCaller(newIntent, null, targetUserId);
    108             } catch (RuntimeException e) {
    109                 int launchedFromUid = -1;
    110                 String launchedFromPackage = "?";
    111                 try {
    112                     launchedFromUid = ActivityManagerNative.getDefault().getLaunchedFromUid(
    113                             getActivityToken());
    114                     launchedFromPackage = ActivityManagerNative.getDefault().getLaunchedFromPackage(
    115                             getActivityToken());
    116                 } catch (RemoteException ignored) {
    117                 }
    118 
    119                 Slog.wtf(TAG, "Unable to launch as UID " + launchedFromUid + " package "
    120                         + launchedFromPackage + ", while running in "
    121                         + ActivityThread.currentProcessName(), e);
    122             }
    123 
    124             if (shouldShowDisclosure) {
    125                 Toast.makeText(this, getString(userMessageId), Toast.LENGTH_LONG).show();
    126             }
    127         } else {
    128             Slog.wtf(TAG, "the intent: " + newIntent + "cannot be forwarded from user "
    129                     + callingUserId + " to user " + targetUserId);
    130         }
    131         finish();
    132     }
    133 
    134     boolean canForward(Intent intent, int targetUserId)  {
    135         IPackageManager ipm = AppGlobals.getPackageManager();
    136         if (intent.getAction().equals(Intent.ACTION_CHOOSER)) {
    137             // The EXTRA_INITIAL_INTENTS may not be allowed to be forwarded.
    138             if (intent.hasExtra(Intent.EXTRA_INITIAL_INTENTS)) {
    139                 Slog.wtf(TAG, "An chooser intent with extra initial intents cannot be forwarded to"
    140                         + " a different user");
    141                 return false;
    142             }
    143             if (intent.hasExtra(Intent.EXTRA_REPLACEMENT_EXTRAS)) {
    144                 Slog.wtf(TAG, "A chooser intent with replacement extras cannot be forwarded to a"
    145                         + " different user");
    146                 return false;
    147             }
    148             intent = (Intent) intent.getParcelableExtra(Intent.EXTRA_INTENT);
    149         }
    150         String resolvedType = intent.resolveTypeIfNeeded(getContentResolver());
    151         if (intent.getSelector() != null) {
    152             intent = intent.getSelector();
    153         }
    154         try {
    155             return ipm.canForwardTo(intent, resolvedType, getUserId(),
    156                     targetUserId);
    157         } catch (RemoteException e) {
    158             Slog.e(TAG, "PackageManagerService is dead?");
    159             return false;
    160         }
    161     }
    162 
    163     /**
    164      * Returns the userId of the managed profile for this device or UserHandle.USER_NULL if there is
    165      * no managed profile.
    166      *
    167      * TODO: Remove the assumption that there is only one managed profile
    168      * on the device.
    169      */
    170     private int getManagedProfile() {
    171         UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
    172         List<UserInfo> relatedUsers = userManager.getProfiles(UserHandle.USER_OWNER);
    173         for (UserInfo userInfo : relatedUsers) {
    174             if (userInfo.isManagedProfile()) return userInfo.id;
    175         }
    176         Slog.wtf(TAG, FORWARD_INTENT_TO_MANAGED_PROFILE
    177                 + " has been called, but there is no managed profile");
    178         return UserHandle.USER_NULL;
    179     }
    180 }
    181