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/**
* Copyright (C) 2018 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/db/commands/kill_op_cmd_base.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/audit.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/client.h"
#include "mongo/db/operation_context.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
Status KillOpCmdBase::checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) const {
AuthorizationSession* authzSession = AuthorizationSession::get(client);
if (authzSession->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
ActionType::killop)) {
// If we have administrative permission to run killop, we don't need to traverse the
// Client list to figure out if we own the operation which will be terminated.
return Status::OK();
}
if (authzSession->isAuthenticated() && isKillingLocalOp(cmdObj.getField("op"))) {
// Look up the OperationContext and see if we have permission to kill it. This is done once
// here and again in the command body. The check here in the checkAuthForCommand() function
// is necessary because if the check fails, it will be picked up by the auditing system.
long long opId = parseOpId(cmdObj);
auto lkAndOp = KillOpCmdBase::findOpForKilling(client, opId);
if (lkAndOp) {
// We were able to find the Operation, and we were authorized to interact with it.
return Status::OK();
}
}
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
bool KillOpCmdBase::isKillingLocalOp(const BSONElement& opElem) {
return opElem.isNumber();
}
boost::optional<std::tuple<stdx::unique_lock<Client>, OperationContext*>>
KillOpCmdBase::findOperationContext(ServiceContext* serviceContext, unsigned int opId) {
for (ServiceContext::LockedClientsCursor cursor(serviceContext);
Client* opClient = cursor.next();) {
stdx::unique_lock<Client> lk(*opClient);
OperationContext* opCtx = opClient->getOperationContext();
if (opCtx && opCtx->getOpID() == opId) {
return {std::make_tuple(std::move(lk), opCtx)};
}
}
return boost::none;
}
boost::optional<std::tuple<stdx::unique_lock<Client>, OperationContext*>>
KillOpCmdBase::findOpForKilling(Client* client, unsigned int opId) {
AuthorizationSession* authzSession = AuthorizationSession::get(client);
auto lockAndOpCtx = findOperationContext(client->getServiceContext(), opId);
if (lockAndOpCtx) {
OperationContext* opToKill = std::get<1>(*lockAndOpCtx);
if (authzSession->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
ActionType::killop) ||
authzSession->isCoauthorizedWithClient(opToKill->getClient())) {
return lockAndOpCtx;
}
}
return boost::none;
}
void KillOpCmdBase::killLocalOperation(OperationContext* opCtx, unsigned int opToKill) {
stdx::unique_lock<Client> lk;
OperationContext* opCtxToKill;
auto lockAndOpCtx = findOpForKilling(opCtx->getClient(), opToKill);
if (!lockAndOpCtx) {
// killOp always reports success past the auth check.
return;
}
std::tie(lk, opCtxToKill) = std::move(*lockAndOpCtx);
invariant(lk);
opCtx->getServiceContext()->killOperation(opCtxToKill);
}
unsigned int KillOpCmdBase::parseOpId(const BSONObj& cmdObj) {
long long op;
uassertStatusOK(bsonExtractIntegerField(cmdObj, "op", &op));
uassert(26823,
str::stream() << "invalid op : " << op << ". Op ID cannot be represented with 32 bits",
(op >= std::numeric_limits<int>::min()) && (op <= std::numeric_limits<int>::max()));
return static_cast<unsigned int>(op);
}
} // namespace mongo
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