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119 lines
3.6 KiB
119 lines
3.6 KiB
/*
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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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#define LOG_TAG "PermissionCache"
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#include <stdint.h>
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#include <utils/Log.h>
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#include <binder/IPCThreadState.h>
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#include <binder/IServiceManager.h>
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#include <binder/PermissionCache.h>
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#include <utils/String8.h>
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namespace android {
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// ----------------------------------------------------------------------------
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ANDROID_SINGLETON_STATIC_INSTANCE(PermissionCache)
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// ----------------------------------------------------------------------------
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PermissionCache::PermissionCache() {
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}
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status_t PermissionCache::check(bool* granted,
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const String16& permission, uid_t uid) const {
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Mutex::Autolock _l(mLock);
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Entry e;
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e.name = permission;
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e.uid = uid;
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ssize_t index = mCache.indexOf(e);
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if (index >= 0) {
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*granted = mCache.itemAt(index).granted;
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return NO_ERROR;
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}
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return NAME_NOT_FOUND;
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}
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void PermissionCache::cache(const String16& permission,
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uid_t uid, bool granted) {
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Mutex::Autolock _l(mLock);
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Entry e;
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ssize_t index = mPermissionNamesPool.indexOf(permission);
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if (index > 0) {
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e.name = mPermissionNamesPool.itemAt(index);
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} else {
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mPermissionNamesPool.add(permission);
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e.name = permission;
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}
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// note, we don't need to store the pid, which is not actually used in
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// permission checks
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e.uid = uid;
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e.granted = granted;
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index = mCache.indexOf(e);
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if (index < 0) {
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mCache.add(e);
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}
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}
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void PermissionCache::purge() {
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Mutex::Autolock _l(mLock);
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mCache.clear();
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}
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bool PermissionCache::checkCallingPermission(const String16& permission) {
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return PermissionCache::checkCallingPermission(permission, nullptr, nullptr);
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}
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bool PermissionCache::checkCallingPermission(
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const String16& permission, int32_t* outPid, int32_t* outUid) {
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IPCThreadState* ipcState = IPCThreadState::self();
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pid_t pid = ipcState->getCallingPid();
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uid_t uid = ipcState->getCallingUid();
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if (outPid) *outPid = pid;
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if (outUid) *outUid = uid;
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return PermissionCache::checkPermission(permission, pid, uid);
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}
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bool PermissionCache::checkPermission(
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const String16& permission, pid_t pid, uid_t uid) {
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if ((uid == 0) || (pid == getpid())) {
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// root and ourselves is always okay
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return true;
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}
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PermissionCache& pc(PermissionCache::getInstance());
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bool granted = false;
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if (pc.check(&granted, permission, uid) != NO_ERROR) {
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nsecs_t t = -systemTime();
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granted = android::checkPermission(permission, pid, uid);
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t += systemTime();
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ALOGD("checking %s for uid=%d => %s (%d us)",
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String8(permission).string(), uid,
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granted?"granted":"denied", (int)ns2us(t));
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pc.cache(permission, uid, granted);
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}
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return granted;
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}
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void PermissionCache::purgeCache() {
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PermissionCache& pc(PermissionCache::getInstance());
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pc.purge();
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}
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// ---------------------------------------------------------------------------
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} // namespace android
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