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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/db/keys_collection_manager.h"
#include "mongo/db/key_generator.h"
#include "mongo/db/keys_collection_cache.h"
#include "mongo/db/keys_collection_client.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/logical_time.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/server_parameters.h"
#include "mongo/db/service_context.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/concurrency/idle_thread_block.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/time_support.h"
namespace mongo {
const Seconds KeysCollectionManager::kKeyValidInterval{3 * 30 * 24 * 60 * 60}; // ~3 months
const std::string KeysCollectionManager::kKeyManagerPurposeString = "HMAC";
MONGO_EXPORT_STARTUP_SERVER_PARAMETER(KeysRotationIntervalSec,
int,
KeysCollectionManager::kKeyValidInterval.count());
namespace {
Milliseconds kDefaultRefreshWaitTime(30 * 1000);
Milliseconds kRefreshIntervalIfErrored(200);
Milliseconds kMaxRefreshWaitTime(10 * 60 * 1000);
// Prevents the refresher thread from waiting longer than the given number of milliseconds, even on
// a successful refresh.
MONGO_FP_DECLARE(maxKeyRefreshWaitTimeOverrideMS);
/**
* Returns the amount of time to wait until the monitoring thread should attempt to refresh again.
*/
Milliseconds howMuchSleepNeedFor(const LogicalTime& currentTime,
const LogicalTime& latestExpiredAt,
const Milliseconds& interval) {
auto currentSecs = currentTime.asTimestamp().getSecs();
auto expiredSecs = latestExpiredAt.asTimestamp().getSecs();
if (currentSecs >= expiredSecs) {
// This means that the last round didn't generate a usable key for the current time.
// However, we don't want to poll too hard as well, so use a low interval.
return kRefreshIntervalIfErrored;
}
auto millisBeforeExpire = 1000 * (expiredSecs - currentSecs);
if (interval.count() <= millisBeforeExpire) {
return interval;
}
return Milliseconds(millisBeforeExpire);
}
} // unnamed namespace
KeysCollectionManager::KeysCollectionManager(std::string purpose,
std::unique_ptr<KeysCollectionClient> client,
Seconds keyValidForInterval)
: _client(std::move(client)),
_purpose(std::move(purpose)),
_keyValidForInterval(keyValidForInterval),
_keysCache(_purpose, _client.get()) {}
StatusWith<KeysCollectionDocument> KeysCollectionManager::getKeyForValidation(
OperationContext* opCtx, long long keyId, const LogicalTime& forThisTime) {
auto keyStatus = _getKeyWithKeyIdCheck(keyId, forThisTime);
if (keyStatus != ErrorCodes::KeyNotFound) {
return keyStatus;
}
_refresher.refreshNow(opCtx);
return _getKeyWithKeyIdCheck(keyId, forThisTime);
}
StatusWith<KeysCollectionDocument> KeysCollectionManager::getKeyForSigning(
OperationContext* opCtx, const LogicalTime& forThisTime) {
return _getKey(forThisTime);
}
StatusWith<KeysCollectionDocument> KeysCollectionManager::_getKeyWithKeyIdCheck(
long long keyId, const LogicalTime& forThisTime) {
auto keyStatus = _keysCache.getKeyById(keyId, forThisTime);
if (!keyStatus.isOK()) {
return keyStatus;
}
return keyStatus.getValue();
}
StatusWith<KeysCollectionDocument> KeysCollectionManager::_getKey(const LogicalTime& forThisTime) {
auto keyStatus = _keysCache.getKey(forThisTime);
if (!keyStatus.isOK()) {
return keyStatus;
}
const auto& key = keyStatus.getValue();
if (key.getExpiresAt() < forThisTime) {
return {ErrorCodes::KeyNotFound,
str::stream() << "No keys found for " << _purpose << " that is valid for "
<< forThisTime.toString()};
}
return key;
}
void KeysCollectionManager::refreshNow(OperationContext* opCtx) {
_refresher.refreshNow(opCtx);
}
void KeysCollectionManager::startMonitoring(ServiceContext* service) {
_keysCache.resetCache();
_refresher.setFunc([this](OperationContext* opCtx) { return _keysCache.refresh(opCtx); });
_refresher.start(
service, str::stream() << "monitoring keys for " << _purpose, _keyValidForInterval);
}
void KeysCollectionManager::stopMonitoring() {
_refresher.stop();
}
void KeysCollectionManager::enableKeyGenerator(OperationContext* opCtx, bool doEnable) {
if (doEnable) {
_refresher.switchFunc(opCtx, [this](OperationContext* opCtx) {
KeyGenerator keyGenerator(_purpose, _client.get(), _keyValidForInterval);
auto keyGenerationStatus = keyGenerator.generateNewKeysIfNeeded(opCtx);
if (ErrorCodes::isShutdownError(keyGenerationStatus.code())) {
return StatusWith<KeysCollectionDocument>(keyGenerationStatus);
}
// An error encountered by the keyGenerator should not prevent refreshing the cache
auto cacheRefreshStatus = _keysCache.refresh(opCtx);
if (!keyGenerationStatus.isOK()) {
return StatusWith<KeysCollectionDocument>(keyGenerationStatus);
}
return cacheRefreshStatus;
});
} else {
_refresher.switchFunc(
opCtx, [this](OperationContext* opCtx) { return _keysCache.refresh(opCtx); });
}
}
bool KeysCollectionManager::hasSeenKeys() {
return _refresher.hasSeenKeys();
}
void KeysCollectionManager::clearCache() {
_keysCache.resetCache();
}
void KeysCollectionManager::PeriodicRunner::refreshNow(OperationContext* opCtx) {
auto refreshRequest = [this]() {
stdx::lock_guard<stdx::mutex> lk(_mutex);
if (_inShutdown) {
uasserted(ErrorCodes::ShutdownInProgress,
"aborting keys cache refresh because node is shutting down");
}
if (_refreshRequest) {
return _refreshRequest;
}
_refreshNeededCV.notify_all();
_refreshRequest = std::make_shared<Notification<void>>();
return _refreshRequest;
}();
// note: waitFor waits min(maxTimeMS, kDefaultRefreshWaitTime).
// waitFor also throws if timeout, so also throw when notification was not satisfied after
// waiting.
if (!refreshRequest->waitFor(opCtx, kDefaultRefreshWaitTime)) {
uasserted(ErrorCodes::ExceededTimeLimit, "timed out waiting for refresh");
}
}
void KeysCollectionManager::PeriodicRunner::_doPeriodicRefresh(ServiceContext* service,
std::string threadName,
Milliseconds refreshInterval) {
Client::initThreadIfNotAlready(threadName);
while (true) {
bool hasRefreshRequestInitially = false;
unsigned errorCount = 0;
std::shared_ptr<RefreshFunc> doRefresh;
{
stdx::lock_guard<stdx::mutex> lock(_mutex);
if (_inShutdown) {
break;
}
invariant(_doRefresh.get() != nullptr);
doRefresh = _doRefresh;
hasRefreshRequestInitially = _refreshRequest.get() != nullptr;
}
Milliseconds nextWakeup = kRefreshIntervalIfErrored;
{
auto opCtx = cc().makeOperationContext();
auto latestKeyStatusWith = (*doRefresh)(opCtx.get());
if (latestKeyStatusWith.getStatus().isOK()) {
errorCount = 0;
const auto& latestKey = latestKeyStatusWith.getValue();
auto currentTime = LogicalClock::get(service)->getClusterTime();
{
stdx::unique_lock<stdx::mutex> lock(_mutex);
_hasSeenKeys = true;
}
nextWakeup =
howMuchSleepNeedFor(currentTime, latestKey.getExpiresAt(), refreshInterval);
} else {
errorCount += 1;
nextWakeup = Milliseconds(kRefreshIntervalIfErrored.count() * errorCount);
if (nextWakeup > kMaxRefreshWaitTime) {
nextWakeup = kMaxRefreshWaitTime;
}
}
}
MONGO_FAIL_POINT_BLOCK(maxKeyRefreshWaitTimeOverrideMS, data) {
const BSONObj& dataObj = data.getData();
auto overrideMS = Milliseconds(dataObj["overrideMS"].numberInt());
if (nextWakeup > overrideMS) {
nextWakeup = overrideMS;
}
}
stdx::unique_lock<stdx::mutex> lock(_mutex);
if (_refreshRequest) {
if (!hasRefreshRequestInitially) {
// A fresh request came in, fulfill the request before going to sleep.
continue;
}
_refreshRequest->set();
_refreshRequest.reset();
}
if (_inShutdown) {
break;
}
// Use a new opCtx so we won't be holding any RecoveryUnit while this thread goes to sleep.
auto opCtx = cc().makeOperationContext();
MONGO_IDLE_THREAD_BLOCK;
auto sleepStatus = opCtx->waitForConditionOrInterruptNoAssertUntil(
_refreshNeededCV, lock, Date_t::now() + nextWakeup);
if (ErrorCodes::isShutdownError(sleepStatus.getStatus().code())) {
break;
}
}
stdx::unique_lock<stdx::mutex> lock(_mutex);
if (_refreshRequest) {
_refreshRequest->set();
_refreshRequest.reset();
}
}
void KeysCollectionManager::PeriodicRunner::setFunc(RefreshFunc newRefreshStrategy) {
stdx::lock_guard<stdx::mutex> lock(_mutex);
_doRefresh = std::make_shared<RefreshFunc>(std::move(newRefreshStrategy));
_refreshNeededCV.notify_all();
}
void KeysCollectionManager::PeriodicRunner::switchFunc(OperationContext* opCtx,
RefreshFunc newRefreshStrategy) {
setFunc(newRefreshStrategy);
}
void KeysCollectionManager::PeriodicRunner::start(ServiceContext* service,
const std::string& threadName,
Milliseconds refreshInterval) {
stdx::lock_guard<stdx::mutex> lock(_mutex);
invariant(!_backgroundThread.joinable());
invariant(!_inShutdown);
_backgroundThread = stdx::thread([this, service, threadName, refreshInterval] {
_doPeriodicRefresh(service, threadName, refreshInterval);
});
}
void KeysCollectionManager::PeriodicRunner::stop() {
{
stdx::lock_guard<stdx::mutex> lock(_mutex);
if (!_backgroundThread.joinable()) {
return;
}
_inShutdown = true;
_hasSeenKeys = false;
_refreshNeededCV.notify_all();
}
_backgroundThread.join();
}
bool KeysCollectionManager::PeriodicRunner::hasSeenKeys() {
stdx::lock_guard<stdx::mutex> lock(_mutex);
return _hasSeenKeys;
}
} // namespace mongo
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