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81 lines
2.5 KiB
81 lines
2.5 KiB
6 years ago
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef BINDER_PERMISSION_H
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#define BINDER_PERMISSION_H
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#include <stdint.h>
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#include <unistd.h>
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#include <utils/String16.h>
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#include <utils/Singleton.h>
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#include <utils/SortedVector.h>
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namespace android {
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// ---------------------------------------------------------------------------
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/*
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* PermissionCache caches permission checks for a given uid.
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*
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* Currently the cache is not updated when there is a permission change,
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* for instance when an application is uninstalled.
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*
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* IMPORTANT: for the reason stated above, only system permissions are safe
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* to cache. This restriction may be lifted at a later time.
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*
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*/
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class PermissionCache : Singleton<PermissionCache> {
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struct Entry {
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String16 name;
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uid_t uid;
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bool granted;
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inline bool operator < (const Entry& e) const {
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return (uid == e.uid) ? (name < e.name) : (uid < e.uid);
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}
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};
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mutable Mutex mLock;
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// we pool all the permission names we see, as many permissions checks
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// will have identical names
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SortedVector< String16 > mPermissionNamesPool;
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// this is our cache per say. it stores pooled names.
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SortedVector< Entry > mCache;
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// free the whole cache, but keep the permission name pool
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void purge();
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status_t check(bool* granted,
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const String16& permission, uid_t uid) const;
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void cache(const String16& permission, uid_t uid, bool granted);
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public:
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PermissionCache();
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static bool checkCallingPermission(const String16& permission);
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static bool checkCallingPermission(const String16& permission,
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int32_t* outPid, int32_t* outUid);
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static bool checkPermission(const String16& permission,
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pid_t pid, uid_t uid);
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};
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// ---------------------------------------------------------------------------
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}; // namespace android
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#endif /* BINDER_PERMISSION_H */
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