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/**
* Copyright (C) 2022-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/crypto/jwk_manager.h"
#include "mongo/bson/json.h"
#include "mongo/crypto/jwt_types_gen.h"
#include "mongo/logv2/log.h"
#include "mongo/util/base64.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kAccessControl
namespace mongo::crypto {
namespace {
constexpr auto kMinKeySizeBytes = 512 >> 3;
// Strip insignificant leading zeroes to determine the key's true size.
StringData reduceInt(StringData value) {
std::size_t ofs = 0;
while ((ofs < value.size()) && (value[ofs] == 0)) {
++ofs;
}
return value.substr(ofs);
}
} // namespace
JWKManager::JWKManager(BSONObj data) {
auto keys = JWKSet::parse(IDLParserContext{"JWKSet"}, data);
for (const auto& key : keys.getKeys()) {
uassert(ErrorCodes::BadValue,
str::stream() << "Only RSA key types are accepted at this time",
key.getType() == "RSA"_sd);
uassert(ErrorCodes::BadValue, "Key ID must be non-empty", !key.getKeyId().empty());
// Sanity check so that we don't load a dangerously small key.
auto N = reduceInt(key.getN());
uassert(ErrorCodes::BadValue,
str::stream() << "Key scale is smaller (" << (N.size() << 3)
<< " bits) than minimum required: " << (kMinKeySizeBytes << 3),
N.size() >= kMinKeySizeBytes);
// Sanity check so that we don't load an insensible encrypt component.
auto E = reduceInt(key.getE());
uassert(ErrorCodes::BadValue,
str::stream() << "Public key component invalid: " << base64url::encode(key.getE()),
(E.size() > 1) || ((E.size() == 1) && (E[0] >= 3)));
auto keyId = key.getKeyId().toString();
uassert(ErrorCodes::DuplicateKey,
str::stream() << "Key IDs must be unique, duplicate '" << keyId << "'",
_keys.find(keyId) == _keys.end());
LOGV2_DEBUG(6766000, 5, "Loaded JWK Key", "kid"_attr = key.getKeyId());
_keys.insert({keyId, {key.getKeyId(), {E.rawData(), E.size()}, {N.rawData(), N.size()}}});
}
}
const RsaPublicKey& JWKManager::getKey(StringData keyId) const {
auto it = _keys.find(keyId.toString());
uassert(
ErrorCodes::NoSuchKey, str::stream() << "Unknown key '" << keyId << "'", it != _keys.end());
return it->second;
}
} // namespace mongo::crypto
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