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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/key_generator.h"
#include "mongo/client/read_preference.h"
#include "mongo/db/keys_collection_client.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/operation_context.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/util/fail_point.h"
namespace mongo {
namespace {
MONGO_FAIL_POINT_DEFINE(disableKeyGeneration);
/**
* Inserts a new key to the keys collection.
*
* Note: this relies on the fact that ShardRegistry returns a ShardLocal for config in config
* servers. In other words, it is relying on the fact that this will always execute the write
* locally and never remotely even if this node is no longer primary.
*/
Status insertNewKey(OperationContext* opCtx,
KeysCollectionClient* client,
long long keyId,
const std::string& purpose,
const LogicalTime& expiresAt) {
KeysCollectionDocument newKey(keyId, purpose, TimeProofService::generateRandomKey(), expiresAt);
return client->insertNewKey(opCtx, newKey.toBSON());
}
/**
* Returns a new LogicalTime with the seconds argument added to it.
*/
LogicalTime addSeconds(const LogicalTime& logicalTime, const Seconds& seconds) {
return LogicalTime(Timestamp(logicalTime.asTimestamp().getSecs() + seconds.count(), 0));
}
} // unnamed namespace
KeyGenerator::KeyGenerator(std::string purpose,
KeysCollectionClient* client,
Seconds keyValidForInterval)
: _client(client), _purpose(std::move(purpose)), _keyValidForInterval(keyValidForInterval) {}
Status KeyGenerator::generateNewKeysIfNeeded(OperationContext* opCtx) {
if (MONGO_unlikely(disableKeyGeneration.shouldFail())) {
return {ErrorCodes::FailPointEnabled, "key generation disabled"};
}
auto currentTime = LogicalClock::get(opCtx)->getClusterTime();
auto keyStatus = _client->getNewKeys(opCtx, _purpose, currentTime, false);
if (!keyStatus.isOK()) {
return keyStatus.getStatus();
}
const auto& newKeys = keyStatus.getValue();
auto keyIter = newKeys.cbegin();
LogicalTime currentKeyExpiresAt;
long long keyId = currentTime.asTimestamp().asLL();
if (keyIter == newKeys.cend()) {
currentKeyExpiresAt = addSeconds(currentTime, _keyValidForInterval);
auto status = insertNewKey(opCtx, _client, keyId, _purpose, currentKeyExpiresAt);
if (!status.isOK()) {
return status;
}
keyId++;
} else if (keyIter->getExpiresAt() < currentTime) {
currentKeyExpiresAt = addSeconds(currentTime, _keyValidForInterval);
auto status = insertNewKey(opCtx, _client, keyId, _purpose, currentKeyExpiresAt);
if (!status.isOK()) {
return status;
}
keyId++;
++keyIter;
} else {
currentKeyExpiresAt = keyIter->getExpiresAt();
++keyIter;
}
// Create a new key in advance if we don't have a key on standby after the current one
// expires.
// Note: Convert this block into a loop if more reserved keys are desired.
if (keyIter == newKeys.cend()) {
auto reserveKeyExpiresAt = addSeconds(currentKeyExpiresAt, _keyValidForInterval);
auto status = insertNewKey(opCtx, _client, keyId, _purpose, reserveKeyExpiresAt);
if (!status.isOK()) {
return status;
}
} else if (keyIter->getExpiresAt() < currentTime) {
currentKeyExpiresAt = addSeconds(currentKeyExpiresAt, _keyValidForInterval);
auto status = insertNewKey(opCtx, _client, keyId, _purpose, currentKeyExpiresAt);
if (!status.isOK()) {
return status;
}
}
return Status::OK();
}
} // namespace mongo
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