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/**
* Copyright (C) 2016 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/db/commands/apply_ops_cmd_common.h"
#include <stack>
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/util/bson_check.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/auth/resource_pattern.h"
#include "mongo/db/catalog/document_validation.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/namespace_string.h"
namespace mongo {
namespace {
Status checkOperationAuthorization(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& oplogEntry,
bool alwaysUpsert) {
AuthorizationSession* authSession = AuthorizationSession::get(opCtx->getClient());
BSONElement opTypeElem = oplogEntry["op"];
checkBSONType(BSONType::String, opTypeElem);
const StringData opType = opTypeElem.checkAndGetStringData();
if (opType == "n"_sd) {
// oplog notes require cluster permissions, and may not have a ns
if (!authSession->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
ActionType::appendOplogNote)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
BSONElement nsElem = oplogEntry["ns"];
checkBSONType(BSONType::String, nsElem);
NamespaceString ns(oplogEntry["ns"].checkAndGetStringData());
BSONElement oElem = oplogEntry["o"];
checkBSONType(BSONType::Object, oElem);
BSONObj o = oElem.Obj();
if (opType == "c"_sd) {
Command* command = Command::findCommand(o.firstElement().fieldNameStringData());
if (!command) {
return Status(ErrorCodes::FailedToParse, "Unrecognized command in op");
}
return Command::checkAuthorization(command, opCtx, dbname, o);
}
if (opType == "i"_sd) {
return authSession->checkAuthForInsert(opCtx, ns, o);
} else if (opType == "u"_sd) {
BSONElement o2Elem = oplogEntry["o2"];
checkBSONType(BSONType::Object, o2Elem);
BSONObj o2 = o2Elem.Obj();
BSONElement bElem = oplogEntry["b"];
if (!bElem.eoo()) {
checkBSONType(BSONType::Bool, bElem);
}
bool b = bElem.trueValue();
const bool upsert = b || alwaysUpsert;
return authSession->checkAuthForUpdate(opCtx, ns, o, o2, upsert);
} else if (opType == "d"_sd) {
return authSession->checkAuthForDelete(opCtx, ns, o);
} else if (opType == "db"_sd) {
// It seems that 'db' isn't used anymore. Require all actions to prevent casual use.
ActionSet allActions;
allActions.addAllActions();
if (!authSession->isAuthorizedForActionsOnResource(ResourcePattern::forAnyResource(),
allActions)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
return Status(ErrorCodes::FailedToParse, "Unrecognized opType");
}
} // namespace
ApplyOpsValidity validateApplyOpsCommand(const BSONObj& cmdObj) {
const size_t maxApplyOpsDepth = 10;
std::stack<std::pair<size_t, BSONObj>> toCheck;
auto operationContainsApplyOps = [](const BSONObj& opObj) {
BSONElement opTypeElem = opObj["op"];
checkBSONType(BSONType::String, opTypeElem);
const StringData opType = opTypeElem.checkAndGetStringData();
if (opType == "c"_sd) {
BSONElement oElem = opObj["o"];
checkBSONType(BSONType::Object, oElem);
BSONObj o = oElem.Obj();
if (o.firstElement().fieldNameStringData() == "applyOps"_sd) {
return true;
}
}
return false;
};
// Insert the top level applyOps command into the stack.
toCheck.emplace(std::make_pair(0, cmdObj));
while (!toCheck.empty()) {
std::pair<size_t, BSONObj> item = toCheck.top();
toCheck.pop();
checkBSONType(BSONType::Array, item.second.firstElement());
// Check if the applyOps command is empty. This is probably not something that should
// happen, so require a superuser to do this.
if (item.second.firstElement().Array().empty()) {
return ApplyOpsValidity::kNeedsSuperuser;
}
// For each applyOps command, iterate the ops.
for (BSONElement element : item.second.firstElement().Array()) {
checkBSONType(BSONType::Object, element);
BSONObj elementObj = element.Obj();
// If the op itself contains an applyOps...
if (operationContainsApplyOps(elementObj)) {
// And we've recursed too far, then bail out.
uassert(ErrorCodes::FailedToParse,
"Too many nested applyOps",
item.first < maxApplyOpsDepth);
// Otherwise, if the op contains an applyOps, but we haven't recursed too far:
// extract the applyOps command, and insert it into the stack.
checkBSONType(BSONType::Object, elementObj["o"]);
BSONObj oObj = elementObj["o"].Obj();
toCheck.emplace(std::make_pair(item.first + 1, std::move(oObj)));
}
}
}
return ApplyOpsValidity::kOk;
}
Status checkAuthForApplyOpsCommand(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj) {
AuthorizationSession* authSession = AuthorizationSession::get(opCtx->getClient());
ApplyOpsValidity validity = validateApplyOpsCommand(cmdObj);
if (validity == ApplyOpsValidity::kNeedsSuperuser) {
std::vector<Privilege> universalPrivileges;
RoleGraph::generateUniversalPrivileges(&universalPrivileges);
if (!authSession->isAuthorizedForPrivileges(universalPrivileges)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
fassert(40314, validity == ApplyOpsValidity::kOk);
boost::optional<DisableDocumentValidation> maybeDisableValidation;
if (shouldBypassDocumentValidationForCommand(cmdObj))
maybeDisableValidation.emplace(opCtx);
const bool alwaysUpsert =
cmdObj.hasField("alwaysUpsert") ? cmdObj["alwaysUpsert"].trueValue() : true;
checkBSONType(BSONType::Array, cmdObj.firstElement());
for (const BSONElement& e : cmdObj.firstElement().Array()) {
checkBSONType(BSONType::Object, e);
Status status = checkOperationAuthorization(opCtx, dbname, e.Obj(), alwaysUpsert);
if (!status.isOK()) {
return status;
}
}
BSONElement preconditions = cmdObj["preCondition"];
if (!preconditions.eoo()) {
for (const BSONElement& precondition : preconditions.Array()) {
checkBSONType(BSONType::Object, precondition);
BSONElement nsElem = precondition.Obj()["ns"];
checkBSONType(BSONType::String, nsElem);
NamespaceString nss(nsElem.checkAndGetStringData());
if (!authSession->isAuthorizedForActionsOnResource(
ResourcePattern::forExactNamespace(nss), ActionType::find)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized to check precondition");
}
}
}
return Status::OK();
}
} // namespace mongo
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