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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/impersonated_user_metadata.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/server_options.h"
namespace mongo {
namespace rpc {
namespace {
static const auto getForOpCtx =
OperationContext::declareDecoration<synchronized_value<MaybeImpersonatedUserMetadata>>();
} // namespace
MaybeImpersonatedUserMetadata getImpersonatedUserMetadata(OperationContext* opCtx) {
return opCtx ? getForOpCtx(opCtx).get() : boost::none;
}
void readImpersonatedUserMetadata(const BSONElement& elem, OperationContext* opCtx) {
// If we have no opCtx, which does appear to happen, don't do anything.
if (!opCtx) {
return;
}
// Always reset the current impersonation data to boost::none.
MaybeImpersonatedUserMetadata newData;
if (elem.type() == Object) {
IDLParserErrorContext errCtx(kImpersonationMetadataSectionName);
auto data = ImpersonatedUserMetadata::parse(errCtx, elem.embeddedObject());
// Set the impersonation data only if there are actually impersonated
// users/roles.
if ((!data.getUsers().empty()) || (!data.getRoles().empty())) {
newData = std::move(data);
}
}
*getForOpCtx(opCtx) = std::move(newData);
}
void writeAuthDataToImpersonatedUserMetadata(OperationContext* opCtx, BSONObjBuilder* out) {
// If we have no opCtx, which does appear to happen, don't do anything.
if (!opCtx) {
return;
}
// Otherwise construct a metadata section from the list of authenticated users/roles
auto authSession = AuthorizationSession::get(opCtx->getClient());
auto userNames = authSession->getImpersonatedUserNames();
auto roleNames = authSession->getImpersonatedRoleNames();
if (!userNames.more() && !roleNames.more()) {
userNames = authSession->getAuthenticatedUserNames();
roleNames = authSession->getAuthenticatedRoleNames();
}
// If there are no users/roles being impersonated just exit
if (!userNames.more() && !roleNames.more()) {
return;
}
ImpersonatedUserMetadata metadata;
metadata.setUsers(userNameIteratorToContainer<std::vector<UserName>>(userNames));
metadata.setRoles(roleNameIteratorToContainer<std::vector<RoleName>>(roleNames));
BSONObjBuilder section(out->subobjStart(kImpersonationMetadataSectionName));
metadata.serialize(§ion);
}
std::size_t estimateImpersonatedUserMetadataSize(OperationContext* opCtx) {
if (!opCtx) {
return 0;
}
// Otherwise construct a metadata section from the list of authenticated users/roles
auto authSession = AuthorizationSession::get(opCtx->getClient());
auto userNames = authSession->getImpersonatedUserNames();
auto roleNames = authSession->getImpersonatedRoleNames();
if (!userNames.more() && !roleNames.more()) {
userNames = authSession->getAuthenticatedUserNames();
roleNames = authSession->getAuthenticatedRoleNames();
}
// If there are no users/roles being impersonated just exit
if (!userNames.more() && !roleNames.more()) {
return 0;
}
std::size_t ret = 4 + // BSONObj size
1 + kImpersonationMetadataSectionName.size() + 1 + // "$audit" sub-object key
4; // $audit object length
// BSONArrayType + "impersonatedUsers" + NULL + BSONArray Length
ret += 1 + ImpersonatedUserMetadata::kUsersFieldName.size() + 1 + 4;
for (std::size_t i = 0; userNames.more(); userNames.next(), ++i) {
// BSONType::Object + strlen(indexId) + NULL byte
// to_string(i).size() will be log10(i) plus some rounding and fuzzing.
// Increment prior to taking the log so that we never take log10(0) which is NAN.
// This estimates one extra byte every time we reach (i % 10) == 9.
ret += 1 + static_cast<std::size_t>(1.1 + log10(i + 1)) + 1;
ret += userNames.get().getBSONObjSize();
}
// EOD terminator for impersonatedUsers
++ret;
// BSONArrayType + "impersonatedRoles" + NULL + BSONArray Length
ret += 1 + ImpersonatedUserMetadata::kRolesFieldName.size() + 1 + 4;
for (std::size_t i = 0; roleNames.more(); roleNames.next(), ++i) {
// Same calculation as for UserNames above.
ret += 1 + static_cast<std::size_t>(1.1 + log10(i + 1)) + 1;
ret += roleNames.get().getBSONObjSize();
}
// EOD terminators for: impersonatedRoles, $audit, and metadata
ret += 1 + 1 + 1;
return ret;
}
} // namespace rpc
} // namespace mongo
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