| /* |
| * Copyright (C) 2009 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. |
| */ |
| |
| #ifndef BINDER_PERMISSION_H |
| #define BINDER_PERMISSION_H |
| |
| #ifndef __ANDROID_VNDK__ |
| |
| #include <stdint.h> |
| #include <unistd.h> |
| |
| #include <utils/String16.h> |
| #include <utils/Singleton.h> |
| #include <utils/SortedVector.h> |
| |
| namespace android { |
| // --------------------------------------------------------------------------- |
| |
| /* |
| * PermissionCache caches permission checks for a given uid. |
| * |
| * Currently the cache is not updated when there is a permission change, |
| * for instance when an application is uninstalled. |
| * |
| * IMPORTANT: for the reason stated above, only system permissions are safe |
| * to cache. This restriction may be lifted at a later time. |
| * |
| */ |
| |
| class PermissionCache : Singleton<PermissionCache> { |
| struct Entry { |
| String16 name; |
| uid_t uid; |
| bool granted; |
| inline bool operator < (const Entry& e) const { |
| return (uid == e.uid) ? (name < e.name) : (uid < e.uid); |
| } |
| }; |
| mutable Mutex mLock; |
| // we pool all the permission names we see, as many permissions checks |
| // will have identical names |
| SortedVector< String16 > mPermissionNamesPool; |
| // this is our cache per say. it stores pooled names. |
| SortedVector< Entry > mCache; |
| |
| // free the whole cache, but keep the permission name pool |
| void purge(); |
| |
| status_t check(bool* granted, |
| const String16& permission, uid_t uid) const; |
| |
| void cache(const String16& permission, uid_t uid, bool granted); |
| |
| public: |
| PermissionCache(); |
| |
| static bool checkCallingPermission(const String16& permission); |
| |
| static bool checkCallingPermission(const String16& permission, |
| int32_t* outPid, int32_t* outUid); |
| |
| static bool checkPermission(const String16& permission, |
| pid_t pid, uid_t uid); |
| }; |
| |
| // --------------------------------------------------------------------------- |
| }; // namespace android |
| |
| #else // __ANDROID_VNDK__ |
| #error "This header is not visible to vendors" |
| #endif // __ANDROID_VNDK__ |
| |
| #endif /* BINDER_PERMISSION_H */ |