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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.
*/
#pragma once
#include <memory>
#include "mongo/db/signed_logical_time.h"
#include "mongo/db/time_proof_service.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
class OperationContext;
class ServiceContext;
class KeysCollectionDocument;
class KeysCollectionManager;
/**
* This is responsible for signing cluster times that can be used to sent to other servers and
* verifying signatures of signed cluster times.
*/
class LogicalTimeValidator {
public:
// Decorate ServiceContext with LogicalTimeValidator instance.
static LogicalTimeValidator* get(ServiceContext* service);
static LogicalTimeValidator* get(OperationContext* ctx);
static void set(ServiceContext* service, std::unique_ptr<LogicalTimeValidator> validator);
/**
* Constructs a new LogicalTimeValidator that uses the given key manager. The passed-in
* key manager must outlive this object.
*/
explicit LogicalTimeValidator(std::shared_ptr<KeysCollectionManager> keyManager);
/**
* Tries to sign the newTime with a valid signature. Can return an empty signature and keyId
* of 0 if it cannot find valid key for newTime.
*/
SignedLogicalTime trySignLogicalTime(const LogicalTime& newTime);
/**
* Returns the newTime with a valid signature.
*/
SignedLogicalTime signLogicalTime(OperationContext* opCtx, const LogicalTime& newTime);
/**
* Returns true if the signature of newTime is valid.
*/
Status validate(OperationContext* opCtx, const SignedLogicalTime& newTime);
/**
* Initializes this validator. This should be called first before the other methods can be used.
*/
void init(ServiceContext* service);
/**
* Cleans up this validator. This will no longer be usable after this is called.
*/
void shutDown();
/**
* Enable writing new keys to the config server primary. Should only be called if current node
* is the config primary.
*/
void enableKeyGenerator(OperationContext* opCtx, bool doEnable);
/**
* Returns true if client has sufficient privilege to advance clock.
*/
static bool isAuthorizedToAdvanceClock(OperationContext* opCtx);
/**
* Returns true if the server should gossip, sign, and validate cluster times. False until there
* are keys in the config server.
*/
bool shouldGossipLogicalTime();
/**
* Stops the key manager and resets its state to prevent the former members of standalone
* replica set to use old keys with sharded cluster.
*/
void stopKeyManager();
/**
* Reset the key manager cache of keys.
*/
void resetKeyManagerCache();
private:
/**
* Returns the copy of the _keyManager to work when its reset by resetKeyManager call.
*/
std::shared_ptr<KeysCollectionManager> _getKeyManagerCopy();
SignedLogicalTime _getProof(const KeysCollectionDocument& keyDoc, LogicalTime newTime);
stdx::mutex _mutex; // protects _lastSeenValidTime
stdx::mutex _mutexKeyManager; // protects _keyManager
SignedLogicalTime _lastSeenValidTime;
TimeProofService _timeProofService;
std::shared_ptr<KeysCollectionManager> _keyManager;
};
} // namespace mongo
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