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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/rpc/metadata.h"
#include "mongo/client/read_preference.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/validated_tenancy_scope.h"
#include "mongo/db/dbmessage.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/logical_time_validator.h"
#include "mongo/db/multitenancy.h"
#include "mongo/db/vector_clock.h"
#include "mongo/db/write_block_bypass.h"
#include "mongo/rpc/metadata/client_metadata.h"
#include "mongo/rpc/metadata/impersonated_user_metadata.h"
#include "mongo/rpc/metadata/tracking_metadata.h"
#include "mongo/util/string_map.h"
#include "mongo/util/testing_proctor.h"
namespace mongo {
namespace rpc {
BSONObj makeEmptyMetadata() {
return BSONObj();
}
void readRequestMetadata(OperationContext* opCtx, const OpMsg& opMsg, bool cmdRequiresAuth) {
BSONElement readPreferenceElem;
BSONElement trackingElem;
BSONElement clientElem;
BSONElement helloClientElem;
BSONElement impersonationElem;
BSONElement clientOperationKeyElem;
BSONElement mayBypassWriteBlockingElem;
for (const auto& metadataElem : opMsg.body) {
auto fieldName = metadataElem.fieldNameStringData();
if (fieldName == "$readPreference") {
readPreferenceElem = metadataElem;
} else if (fieldName == ClientMetadata::fieldName()) {
clientElem = metadataElem;
} else if (fieldName == TrackingMetadata::fieldName()) {
trackingElem = metadataElem;
} else if (fieldName == kImpersonationMetadataSectionName) {
impersonationElem = metadataElem;
} else if (fieldName == "clientOperationKey"_sd) {
clientOperationKeyElem = metadataElem;
} else if (fieldName == WriteBlockBypass::fieldName()) {
mayBypassWriteBlockingElem = metadataElem;
}
}
AuthorizationSession* authSession = AuthorizationSession::get(opCtx->getClient());
if (clientOperationKeyElem &&
(TestingProctor::instance().isEnabled() ||
authSession->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
ActionType::internal))) {
auto opKey = uassertStatusOK(UUID::parse(clientOperationKeyElem));
opCtx->setOperationKey(std::move(opKey));
}
if (readPreferenceElem) {
ReadPreferenceSetting::get(opCtx) =
uassertStatusOK(ReadPreferenceSetting::fromInnerBSON(readPreferenceElem));
}
readImpersonatedUserMetadata(impersonationElem, opCtx);
auth::ValidatedTenancyScope::set(opCtx, opMsg.validatedTenancyScope);
// We check for "$client" but not "client" here, because currentOp can filter on "client" as
// a top-level field.
if (clientElem) {
// The '$client' field is populated by mongos when it sends requests to shards on behalf of
// its own requests. This may or may not be relevant for SERVER-50804.
ClientMetadata::setFromMetadataForOperation(opCtx, clientElem);
}
TrackingMetadata::get(opCtx) =
uassertStatusOK(TrackingMetadata::readFromMetadata(trackingElem));
VectorClock::get(opCtx)->gossipIn(opCtx, opMsg.body, !cmdRequiresAuth);
WriteBlockBypass::get(opCtx).setFromMetadata(opCtx, mayBypassWriteBlockingElem);
}
namespace {
const auto docSequenceFieldsForCommands = StringMap<std::string>{
{"insert", "documents"}, //
{"update", "updates"},
{"delete", "deletes"},
};
bool isArrayOfObjects(BSONElement array) {
if (array.type() != Array)
return false;
for (auto elem : array.Obj()) {
if (elem.type() != Object)
return false;
}
return true;
}
} // namespace
OpMsgRequest upconvertRequest(StringData db, BSONObj cmdObj, int queryFlags) {
cmdObj = cmdObj.getOwned(); // Usually this is a no-op since it is already owned.
auto readPrefContainer = BSONObj();
if (auto queryOptions = cmdObj["$queryOptions"]) {
// Mongos rewrites commands with $readPreference to put it in a field nested inside of
// $queryOptions. Its command implementations often forward commands in that format to
// shards. This function is responsible for rewriting it to a format that the shards
// understand.
//
// TODO SERVER-29091: The use of $queryOptions is a holdover related to the
// no-longer-supported OP_QUERY format. We should remove it from the code base.
readPrefContainer = queryOptions.Obj().shareOwnershipWith(cmdObj);
cmdObj = cmdObj.removeField("$queryOptions");
}
if (!readPrefContainer.isEmpty()) {
uassert(ErrorCodes::InvalidOptions,
"Duplicate readPreference found in command object.",
!cmdObj.hasField("$readPreference"));
cmdObj = BSONObjBuilder(std::move(cmdObj)).appendElements(readPrefContainer).obj();
} else if (!cmdObj.hasField("$readPreference") && (queryFlags & QueryOption_SecondaryOk)) {
BSONObjBuilder bodyBuilder(std::move(cmdObj));
ReadPreferenceSetting(ReadPreference::SecondaryPreferred).toContainingBSON(&bodyBuilder);
cmdObj = bodyBuilder.obj();
}
uassert(40621, "$db is not allowed in OP_QUERY requests", !cmdObj.hasField("$db"));
// Try to move supported array fields into document sequences.
auto docSequenceIt = docSequenceFieldsForCommands.find(cmdObj.firstElementFieldName());
auto docSequenceElem = docSequenceIt == docSequenceFieldsForCommands.end()
? BSONElement()
: cmdObj[docSequenceIt->second];
if (!isArrayOfObjects(docSequenceElem))
return OpMsgRequest::fromDBAndBody(db, std::move(cmdObj));
auto docSequenceName = docSequenceElem.fieldNameStringData();
// Note: removing field before adding "$db" to avoid the need to copy the potentially large
// array.
auto out = OpMsgRequest::fromDBAndBody(db, cmdObj.removeField(docSequenceName));
out.sequences.push_back({docSequenceName.toString()});
for (auto elem : docSequenceElem.Obj()) {
out.sequences[0].objs.push_back(elem.Obj().shareOwnershipWith(cmdObj));
}
return out;
}
} // namespace rpc
} // namespace mongo
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