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/*
* 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
#include <stdint.h>
#include <unistd.h>
#include <utils/String16.h>
#include <utils/Singleton.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
#endif /* BINDER_PERMISSION_H */
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