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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::kCommand
#include "mongo/platform/basic.h"
#include <limits>
#include "mongo/base/init.h"
#include "mongo/base/status.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/commands.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
class KillOpCommand : public BasicCommand {
public:
KillOpCommand() : BasicCommand("killOp") {}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
bool slaveOk() const final {
return true;
}
bool adminOnly() const final {
return true;
}
static long long parseOpId(const BSONObj& cmdObj) {
long long op;
uassertStatusOK(bsonExtractIntegerField(cmdObj, "op", &op));
// Internally opid is an unsigned 32-bit int, but as BSON only has signed integer types,
// we wrap values exceeding 2,147,483,647 to negative numbers. The following undoes this
// transformation, so users can use killOp on the (negative) opid they received.
if (op >= std::numeric_limits<int>::min() && op < 0)
op += 1ull << 32;
uassert(26823,
str::stream() << "invalid op : " << op,
(op >= 0) && (op <= std::numeric_limits<unsigned int>::max()));
return op;
}
static StatusWith<std::tuple<stdx::unique_lock<Client>, OperationContext*>> _findOp(
Client* client, unsigned int opId) {
AuthorizationSession* authzSession = AuthorizationSession::get(client);
for (ServiceContext::LockedClientsCursor cursor(client->getServiceContext());
Client* opClient = cursor.next();) {
stdx::unique_lock<Client> lk(*opClient);
OperationContext* opCtx = opClient->getOperationContext();
if (opCtx && opCtx->getOpID() == opId) {
if (authzSession->isAuthorizedForActionsOnResource(
ResourcePattern::forClusterResource(), ActionType::killop) ||
authzSession->isCoauthorizedWithClient(opClient)) {
return {std::make_tuple(std::move(lk), opCtx)};
}
break;
}
}
return Status(ErrorCodes::NoSuchKey, str::stream() << "Could not access opID: " << opId);
}
Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) final {
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();
}
bool isAuthenticated =
AuthorizationSession::get(client)->getAuthenticatedUserNames().more();
if (isAuthenticated) {
long long opId = parseOpId(cmdObj);
auto swLkAndOp = _findOp(client, opId);
if (swLkAndOp.isOK()) {
// We were able to find the Operation, and we were authorized to interact with it.
return Status::OK();
}
}
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
bool run(OperationContext* opCtx,
const std::string& db,
const BSONObj& cmdObj,
BSONObjBuilder& result) final {
long long opId = parseOpId(cmdObj);
log() << "going to kill op: " << opId;
result.append("info", "attempting to kill op");
auto swLkAndOp = _findOp(opCtx->getClient(), opId);
if (swLkAndOp.isOK()) {
stdx::unique_lock<Client> lk;
OperationContext* opCtxToKill;
std::tie(lk, opCtxToKill) = std::move(swLkAndOp.getValue());
opCtx->getServiceContext()->killOperation(opCtxToKill);
}
return true;
}
} killOpCmd;
} // namespace mongo
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