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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/client/scram_sha1_client_cache.h"
namespace mongo {
scram::SCRAMSecrets SCRAMSHA1ClientCache::getCachedSecrets(
const HostAndPort& target, const scram::SCRAMPresecrets& presecrets) const {
const stdx::lock_guard<stdx::mutex> lock(_hostToSecretsMutex);
// Search the cache for a record associated with the host we're trying to connect to.
auto foundSecret = _hostToSecrets.find(target);
if (foundSecret != _hostToSecrets.end()) {
// Presecrets contain parameters provided by the server, which may change. If the
// cached presecrets don't match the presecrets we have on hand, we must not return the
// stale cached secrets. We'll need to rerun the SCRAM computation.
const scram::SCRAMPresecrets& foundPresecrets = foundSecret->second.first;
if (foundPresecrets == presecrets) {
return foundSecret->second.second;
}
}
return {};
}
void SCRAMSHA1ClientCache::setCachedSecrets(HostAndPort target,
scram::SCRAMPresecrets presecrets,
scram::SCRAMSecrets secrets) {
const stdx::lock_guard<stdx::mutex> lock(_hostToSecretsMutex);
decltype(_hostToSecrets)::iterator it;
bool insertionSuccessful;
auto cacheRecord = std::make_pair(std::move(presecrets), std::move(secrets));
// Insert the presecrets, and the secrets we computed for them into the cache
std::tie(it, insertionSuccessful) = _hostToSecrets.emplace(std::move(target), cacheRecord);
// If there was already a cache entry for the target HostAndPort, we should overwrite it.
// We have fresher presecrets and secrets.
if (!insertionSuccessful) {
it->second = std::move(cacheRecord);
}
}
} // namespace mongo
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