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      1 /*
      2  * Copyright (C) 2016 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.server.am;
     18 
     19 import static android.app.ActivityManager.INTENT_SENDER_ACTIVITY;
     20 import static android.app.PendingIntent.FLAG_CANCEL_CURRENT;
     21 import static android.app.PendingIntent.FLAG_IMMUTABLE;
     22 import static android.app.PendingIntent.FLAG_ONE_SHOT;
     23 import static android.content.Context.KEYGUARD_SERVICE;
     24 import static android.content.Intent.EXTRA_INTENT;
     25 import static android.content.Intent.EXTRA_PACKAGE_NAME;
     26 import static android.content.Intent.EXTRA_TASK_ID;
     27 import static android.content.Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS;
     28 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
     29 import static android.content.Intent.FLAG_ACTIVITY_TASK_ON_HOME;
     30 import static android.content.pm.ApplicationInfo.FLAG_SUSPENDED;
     31 
     32 import android.app.ActivityOptions;
     33 import android.app.KeyguardManager;
     34 import android.app.admin.DevicePolicyManagerInternal;
     35 import android.content.IIntentSender;
     36 import android.content.Intent;
     37 import android.content.IntentSender;
     38 import android.content.pm.ActivityInfo;
     39 import android.content.pm.ResolveInfo;
     40 import android.content.pm.UserInfo;
     41 import android.os.Binder;
     42 import android.os.UserHandle;
     43 import android.os.UserManager;
     44 
     45 import com.android.internal.app.UnlaunchableAppActivity;
     46 import com.android.server.LocalServices;
     47 
     48 /**
     49  * A class that contains activity intercepting logic for {@link ActivityStarter#startActivityLocked}
     50  * It's initialized
     51  */
     52 class ActivityStartInterceptor {
     53 
     54     private final ActivityManagerService mService;
     55     private UserManager mUserManager;
     56     private final ActivityStackSupervisor mSupervisor;
     57 
     58     /*
     59      * Per-intent states loaded from ActivityStarter than shouldn't be changed by any
     60      * interception routines.
     61      */
     62     private int mRealCallingPid;
     63     private int mRealCallingUid;
     64     private int mUserId;
     65     private int mStartFlags;
     66     private String mCallingPackage;
     67 
     68     /*
     69      * Per-intent states that were load from ActivityStarter and are subject to modifications
     70      * by the interception routines. After calling {@link #intercept} the caller should assign
     71      * these values back to {@link ActivityStarter#startActivityLocked}'s local variables.
     72      */
     73     Intent mIntent;
     74     int mCallingPid;
     75     int mCallingUid;
     76     ResolveInfo mRInfo;
     77     ActivityInfo mAInfo;
     78     String mResolvedType;
     79     TaskRecord mInTask;
     80     ActivityOptions mActivityOptions;
     81 
     82     ActivityStartInterceptor(ActivityManagerService service, ActivityStackSupervisor supervisor) {
     83         mService = service;
     84         mSupervisor = supervisor;
     85     }
     86 
     87     void setStates(int userId, int realCallingPid, int realCallingUid, int startFlags,
     88             String callingPackage) {
     89         mRealCallingPid = realCallingPid;
     90         mRealCallingUid = realCallingUid;
     91         mUserId = userId;
     92         mStartFlags = startFlags;
     93         mCallingPackage = callingPackage;
     94     }
     95 
     96     void intercept(Intent intent, ResolveInfo rInfo, ActivityInfo aInfo, String resolvedType,
     97             TaskRecord inTask, int callingPid, int callingUid, ActivityOptions activityOptions) {
     98         mUserManager = UserManager.get(mService.mContext);
     99         mIntent = intent;
    100         mCallingPid = callingPid;
    101         mCallingUid = callingUid;
    102         mRInfo = rInfo;
    103         mAInfo = aInfo;
    104         mResolvedType = resolvedType;
    105         mInTask = inTask;
    106         mActivityOptions = activityOptions;
    107         if (interceptSuspendPackageIfNeed()) {
    108             // Skip the rest of interceptions as the package is suspended by device admin so
    109             // no user action can undo this.
    110             return;
    111         }
    112         if (interceptQuietProfileIfNeeded()) {
    113             // If work profile is turned off, skip the work challenge since the profile can only
    114             // be unlocked when profile's user is running.
    115             return;
    116         }
    117         interceptWorkProfileChallengeIfNeeded();
    118     }
    119 
    120     private boolean interceptQuietProfileIfNeeded() {
    121         // Do not intercept if the user has not turned off the profile
    122         if (!mUserManager.isQuietModeEnabled(UserHandle.of(mUserId))) {
    123             return false;
    124         }
    125         IIntentSender target = mService.getIntentSenderLocked(
    126                 INTENT_SENDER_ACTIVITY, mCallingPackage, mCallingUid, mUserId, null, null, 0,
    127                 new Intent[] {mIntent}, new String[] {mResolvedType},
    128                 FLAG_CANCEL_CURRENT | FLAG_ONE_SHOT, null);
    129 
    130         mIntent = UnlaunchableAppActivity.createInQuietModeDialogIntent(mUserId,
    131                 new IntentSender(target));
    132         mCallingPid = mRealCallingPid;
    133         mCallingUid = mRealCallingUid;
    134         mResolvedType = null;
    135 
    136         final UserInfo parent = mUserManager.getProfileParent(mUserId);
    137         mRInfo = mSupervisor.resolveIntent(mIntent, mResolvedType, parent.id);
    138         mAInfo = mSupervisor.resolveActivity(mIntent, mRInfo, mStartFlags, null /*profilerInfo*/);
    139         return true;
    140     }
    141 
    142     private boolean interceptSuspendPackageIfNeed() {
    143         // Do not intercept if the admin did not suspend the package
    144         if (mAInfo == null || mAInfo.applicationInfo == null ||
    145                 (mAInfo.applicationInfo.flags & FLAG_SUSPENDED) == 0) {
    146             return false;
    147         }
    148         DevicePolicyManagerInternal devicePolicyManager = LocalServices.getService(
    149                 DevicePolicyManagerInternal.class);
    150         if (devicePolicyManager == null) {
    151             return false;
    152         }
    153         mIntent = devicePolicyManager.createPackageSuspendedDialogIntent(
    154                 mAInfo.packageName, mUserId);
    155         mCallingPid = mRealCallingPid;
    156         mCallingUid = mRealCallingUid;
    157         mResolvedType = null;
    158 
    159         final UserInfo parent = mUserManager.getProfileParent(mUserId);
    160         if (parent != null) {
    161             mRInfo = mSupervisor.resolveIntent(mIntent, mResolvedType, parent.id);
    162         } else {
    163             mRInfo = mSupervisor.resolveIntent(mIntent, mResolvedType, mUserId);
    164         }
    165         mAInfo = mSupervisor.resolveActivity(mIntent, mRInfo, mStartFlags, null /*profilerInfo*/);
    166         return true;
    167     }
    168 
    169     private boolean interceptWorkProfileChallengeIfNeeded() {
    170         final Intent interceptingIntent = interceptWithConfirmCredentialsIfNeeded(mIntent,
    171                 mResolvedType, mAInfo, mCallingPackage, mUserId);
    172         if (interceptingIntent == null) {
    173             return false;
    174         }
    175         mIntent = interceptingIntent;
    176         mCallingPid = mRealCallingPid;
    177         mCallingUid = mRealCallingUid;
    178         mResolvedType = null;
    179         // If we are intercepting and there was a task, convert it into an extra for the
    180         // ConfirmCredentials intent and unassign it, as otherwise the task will move to
    181         // front even if ConfirmCredentials is cancelled.
    182         if (mInTask != null) {
    183             mIntent.putExtra(EXTRA_TASK_ID, mInTask.taskId);
    184             mInTask = null;
    185         }
    186         if (mActivityOptions == null) {
    187             mActivityOptions = ActivityOptions.makeBasic();
    188         }
    189 
    190         ActivityRecord homeActivityRecord = mSupervisor.getHomeActivity();
    191         if (homeActivityRecord != null && homeActivityRecord.task != null) {
    192             // Showing credential confirmation activity in home task to avoid stopping multi-windowed
    193             // mode after showing the full-screen credential confirmation activity.
    194             mActivityOptions.setLaunchTaskId(homeActivityRecord.task.taskId);
    195         }
    196 
    197         final UserInfo parent = mUserManager.getProfileParent(mUserId);
    198         mRInfo = mSupervisor.resolveIntent(mIntent, mResolvedType, parent.id);
    199         mAInfo = mSupervisor.resolveActivity(mIntent, mRInfo, mStartFlags, null /*profilerInfo*/);
    200         return true;
    201     }
    202 
    203     /**
    204      * Creates an intent to intercept the current activity start with Confirm Credentials if needed.
    205      *
    206      * @return The intercepting intent if needed.
    207      */
    208     private Intent interceptWithConfirmCredentialsIfNeeded(Intent intent, String resolvedType,
    209             ActivityInfo aInfo, String callingPackage, int userId) {
    210         if (!mService.mUserController.shouldConfirmCredentials(userId)) {
    211             return null;
    212         }
    213         final IIntentSender target = mService.getIntentSenderLocked(
    214                 INTENT_SENDER_ACTIVITY, callingPackage,
    215                 Binder.getCallingUid(), userId, null, null, 0, new Intent[]{ intent },
    216                 new String[]{ resolvedType },
    217                 FLAG_CANCEL_CURRENT | FLAG_ONE_SHOT | FLAG_IMMUTABLE, null);
    218         final KeyguardManager km = (KeyguardManager) mService.mContext
    219                 .getSystemService(KEYGUARD_SERVICE);
    220         final Intent newIntent = km.createConfirmDeviceCredentialIntent(null, null, userId);
    221         if (newIntent == null) {
    222             return null;
    223         }
    224         newIntent.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS |
    225                 FLAG_ACTIVITY_TASK_ON_HOME);
    226         newIntent.putExtra(EXTRA_PACKAGE_NAME, aInfo.packageName);
    227         newIntent.putExtra(EXTRA_INTENT, new IntentSender(target));
    228         return newIntent;
    229     }
    230 
    231 }
    232