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/**
* Copyright (C) 2015 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::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/client/sharding_connection_hook.h"
#include <string>
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/audit.h"
#include "mongo/db/auth/authorization_manager_global.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/internal_user_auth.h"
#include "mongo/db/client.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/rpc/metadata/audit_metadata.h"
#include "mongo/rpc/metadata/config_server_metadata.h"
#include "mongo/s/client/scc_fast_query_handler.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/cluster_last_error_info.h"
#include "mongo/s/grid.h"
#include "mongo/s/version_manager.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
namespace mongo {
using std::string;
namespace {
// A hook that parses the reply metadata from every response to a command sent from a DBClient
// created by mongos or a sharding aware mongod and being used for sharded operations.
// Used by mongos to capture the GLE stats so that we can target the correct node when subsequent
// getLastError calls are made, as well as by both mongod and mongos to update the stored config
// server optime.
Status _shardingReplyMetadataReader(const BSONObj& metadataObj, StringData hostString) {
saveGLEStats(metadataObj, hostString);
auto shard = grid.shardRegistry()->getShardNoReload(hostString.toString());
if (!shard) {
return Status::OK();
}
// If this host is a known shard of ours, look for a config server optime in the response
// metadata to use to update our notion of the current config server optime.
auto responseStatus = rpc::ConfigServerMetadata::readFromMetadata(metadataObj);
if (!responseStatus.isOK()) {
return responseStatus.getStatus();
}
auto opTime = responseStatus.getValue().getOpTime();
if (opTime.is_initialized()) {
grid.shardRegistry()->advanceConfigOpTime(opTime.get());
}
return Status::OK();
}
// A hook that will append impersonated users to the metadata of every runCommand run by a DBClient
// created by mongos or a sharding aware mongod. mongos uses this information to send information
// to mongod so that the mongod can produce auditing records attributed to the proper authenticated
// user(s).
// Additionally, if the connection is sharding-aware, also appends the stored config server optime.
Status _shardingRequestMetadataWriter(bool shardedConn,
BSONObjBuilder* metadataBob,
StringData hostStringData) {
audit::writeImpersonatedUsersToMetadata(metadataBob);
if (!shardedConn) {
return Status::OK();
}
// Add config server optime to metadata sent to shards.
std::string hostString = hostStringData.toString();
auto shard = grid.shardRegistry()->getShardNoReload(hostString);
if (!shard) {
return Status(ErrorCodes::ShardNotFound,
str::stream() << "Shard not found for server: " << hostString);
}
if (shard->isConfig()) {
return Status::OK();
}
rpc::ConfigServerMetadata(grid.shardRegistry()->getConfigOpTime()).writeToMetadata(metadataBob);
return Status::OK();
}
} // namespace
ShardingConnectionHook::ShardingConnectionHook(bool shardedConnections)
: _shardedConnections(shardedConnections) {}
void ShardingConnectionHook::onCreate(DBClientBase* conn) {
// Authenticate as the first thing we do
// NOTE: Replica set authentication allows authentication against *any* online host
if (getGlobalAuthorizationManager()->isAuthEnabled()) {
LOG(2) << "calling onCreate auth for " << conn->toString();
bool result = conn->authenticateInternalUser();
uassert(15847,
str::stream() << "can't authenticate to server " << conn->getServerAddress(),
result);
}
if (_shardedConnections) {
conn->setReplyMetadataReader(_shardingReplyMetadataReader);
}
conn->setRequestMetadataWriter(
[this](BSONObjBuilder* metadataBob, StringData hostStringData) -> Status {
return _shardingRequestMetadataWriter(_shardedConnections, metadataBob, hostStringData);
});
// For every SCC created, add a hook that will allow fastest-config-first config reads if
// the appropriate server options are set.
if (conn->type() == ConnectionString::SYNC) {
SyncClusterConnection* scc = dynamic_cast<SyncClusterConnection*>(conn);
if (scc) {
scc->attachQueryHandler(new SCCFastQueryHandler);
}
} else if (conn->type() == ConnectionString::MASTER) {
BSONObj isMasterResponse;
if (!conn->runCommand("admin", BSON("ismaster" << 1), isMasterResponse)) {
uassertStatusOK(getStatusFromCommandResult(isMasterResponse));
}
long long configServerModeNumber;
Status status =
bsonExtractIntegerField(isMasterResponse, "configsvr", &configServerModeNumber);
if (status == ErrorCodes::NoSuchKey) {
// This isn't a config server we're talking to.
return;
}
uassert(28785,
str::stream() << "Unrecognized configsvr version number: " << configServerModeNumber
<< ". Expected either 0 or 1",
configServerModeNumber == 0 || configServerModeNumber == 1);
auto configServerMode = configServerModeNumber == 0
? CatalogManager::ConfigServerMode::SCCC
: CatalogManager::ConfigServerMode::CSRS;
// We still want to call scheduleReplaceCatalogManagerIfNeeded when configServerMode
// is SCCC to catch illegal downgrade attempts and return a useful error message.
// To enable that we use the default (invalid) ConnectionString when configServerMode
// is SCCC.
ConnectionString configConnString;
if (configServerMode == CatalogManager::ConfigServerMode::CSRS) {
uassert(ErrorCodes::ReplicaSetNotFound,
"CSRS replica set is not initialized",
isMasterResponse.hasField("setName"));
configConnString = ConnectionString::forReplicaSet(
isMasterResponse["setName"].valueStringData(),
{static_cast<DBClientConnection*>(conn)->getServerHostAndPort()});
}
status = grid.forwardingCatalogManager()->scheduleReplaceCatalogManagerIfNeeded(
configServerMode, configConnString);
uassertStatusOK(status);
}
}
void ShardingConnectionHook::onDestroy(DBClientBase* conn) {
if (_shardedConnections && versionManager.isVersionableCB(conn)) {
versionManager.resetShardVersionCB(conn);
}
}
void ShardingConnectionHook::onRelease(DBClientBase* conn) {
// This is currently for making the replica set connections release
// secondary connections to the pool.
conn->reset();
}
} // namespace mongo
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