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      1 /*
      2  * Copyright (C) 2018 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 #include <mutex>
     18 #include <binder/PermissionController.h>
     19 #include <binder/Binder.h>
     20 #include <binder/IServiceManager.h>
     21 
     22 #include <utils/SystemClock.h>
     23 
     24 namespace android {
     25 
     26 PermissionController::PermissionController()
     27 {
     28 }
     29 
     30 sp<IPermissionController> PermissionController::getService()
     31 {
     32     std::lock_guard<Mutex> scoped_lock(mLock);
     33     int64_t startTime = 0;
     34     sp<IPermissionController> service = mService;
     35     while (service == nullptr || !IInterface::asBinder(service)->isBinderAlive()) {
     36         sp<IBinder> binder = defaultServiceManager()->checkService(String16("permission"));
     37         if (binder == nullptr) {
     38             // Wait for the activity service to come back...
     39             if (startTime == 0) {
     40                 startTime = uptimeMillis();
     41                 ALOGI("Waiting for permission service");
     42             } else if ((uptimeMillis() - startTime) > 10000) {
     43                 ALOGW("Waiting too long for permission service, giving up");
     44                 service = nullptr;
     45                 break;
     46             }
     47             sleep(1);
     48         } else {
     49             service = interface_cast<IPermissionController>(binder);
     50             mService = service;
     51         }
     52     }
     53     return service;
     54 }
     55 
     56 bool PermissionController::checkPermission(const String16& permission, int32_t pid, int32_t uid)
     57 {
     58     sp<IPermissionController> service = getService();
     59     return service != nullptr ? service->checkPermission(permission, pid, uid) : false;
     60 }
     61 
     62 int32_t PermissionController::noteOp(const String16& op, int32_t uid, const String16& packageName)
     63 {
     64     sp<IPermissionController> service = getService();
     65     return service != nullptr ? service->noteOp(op, uid, packageName) : MODE_ERRORED;
     66 }
     67 
     68 void PermissionController::getPackagesForUid(const uid_t uid, Vector<String16> &packages)
     69 {
     70     sp<IPermissionController> service = getService();
     71     if (service != nullptr) {
     72         service->getPackagesForUid(uid, packages);
     73     }
     74 }
     75 
     76 bool PermissionController::isRuntimePermission(const String16& permission)
     77 {
     78     sp<IPermissionController> service = getService();
     79     return service != nullptr ? service->isRuntimePermission(permission) : false;
     80 }
     81 
     82 int PermissionController::getPackageUid(const String16& package, int flags)
     83 {
     84     sp<IPermissionController> service = getService();
     85     return service != nullptr ? service->getPackageUid(package, flags) : -1;
     86 }
     87 
     88 }; // namespace android
     89