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/*
* Copyright (C) 2015 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.
*/
#define LOG_TAG "KeystoreOperation"
#include "operation.h"
#include <algorithm>
namespace keystore {
OperationMap::OperationMap(IBinder::DeathRecipient* deathRecipient)
: mDeathRecipient(deathRecipient) {}
sp<IBinder> OperationMap::addOperation(uint64_t handle, uint64_t keyid, KeyPurpose purpose,
const OperationMap::km_device_t& dev,
const sp<IBinder>& appToken,
KeyCharacteristics&& characteristics, bool pruneable) {
sp<IBinder> token = new ::android::BBinder();
mMap.emplace(token,
Operation(handle, keyid, purpose, dev, std::move(characteristics), appToken));
if (pruneable) mLru.push_back(token);
if (mAppTokenMap.find(appToken) == mAppTokenMap.end()) appToken->linkToDeath(mDeathRecipient);
mAppTokenMap[appToken].push_back(token);
return token;
}
NullOr<const OperationMap::Operation&> OperationMap::getOperation(const sp<IBinder>& token) {
auto entry = mMap.find(token);
if (entry == mMap.end()) return {};
updateLru(token);
return entry->second;
}
void OperationMap::updateLru(const sp<IBinder>& token) {
auto lruEntry = std::find(mLru.begin(), mLru.end(), token);
if (lruEntry != mLru.end()) {
mLru.erase(lruEntry);
mLru.push_back(token);
}
}
NullOr<OperationMap::Operation> OperationMap::removeOperation(const sp<IBinder>& token) {
auto entry = mMap.find(token);
if (entry == mMap.end()) return {};
Operation op = std::move(entry->second);
mMap.erase(entry);
auto lruEntry = std::find(mLru.begin(), mLru.end(), token);
if (lruEntry != mLru.end()) mLru.erase(lruEntry);
removeOperationTracking(token, op.appToken);
return op;
}
void OperationMap::removeOperationTracking(const sp<IBinder>& token, const sp<IBinder>& appToken) {
auto appEntry = mAppTokenMap.find(appToken);
if (appEntry == mAppTokenMap.end()) {
ALOGE("Entry for %p contains unmapped application token %p", token.get(), appToken.get());
return;
}
auto tokenEntry = std::find(appEntry->second.begin(), appEntry->second.end(), token);
appEntry->second.erase(tokenEntry);
// Stop listening for death if all operations tied to the token have finished.
if (appEntry->second.size() == 0) {
appToken->unlinkToDeath(mDeathRecipient);
mAppTokenMap.erase(appEntry);
}
}
bool OperationMap::hasPruneableOperation() const {
return !mLru.empty();
}
size_t OperationMap::getPruneableOperationCount() const {
return mLru.size();
}
sp<IBinder> OperationMap::getOldestPruneableOperation() {
if (!hasPruneableOperation()) return sp<IBinder>(nullptr);
return mLru.front();
}
bool OperationMap::setOperationAuthToken(const sp<IBinder>& token, HardwareAuthToken authToken) {
auto entry = mMap.find(token);
if (entry == mMap.end()) return false;
entry->second.authToken = std::make_unique<HardwareAuthToken>(std::move(authToken));
return true;
}
std::vector<sp<IBinder>> OperationMap::getOperationsForToken(const sp<IBinder>& appToken) {
auto appEntry = mAppTokenMap.find(appToken);
if (appEntry == mAppTokenMap.end()) return {};
return appEntry->second;
}
OperationMap::Operation::Operation(uint64_t handle_, uint64_t keyid_, KeyPurpose purpose_,
const OperationMap::km_device_t& device_,
KeyCharacteristics&& characteristics_, sp<IBinder> appToken_)
: handle(handle_), keyid(keyid_), purpose(purpose_), device(device_),
characteristics(characteristics_), appToken(appToken_) {}
} // namespace keystore
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