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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/jws_validator.h"
#include "mongo/crypto/jwt_types_gen.h"
#include "mongo/db/commands/test_commands_enabled.h"
#include "mongo/logv2/log.h"
#include "mongo/util/base64.h"
#include "mongo/util/net/http_client.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kAccessControl
namespace mongo::crypto {
namespace {
constexpr auto kMinKeySizeBytes = 2048 >> 3;
using SharedValidator = std::shared_ptr<JWSValidator>;
using SharedMap = std::map<std::string, SharedValidator>;
// 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(StringData source) : _keyURI(source) {
auto httpClient = HttpClient::createWithoutConnectionPool();
httpClient->setHeaders({"Accept: */*"});
httpClient->allowInsecureHTTP(getTestCommandsEnabled());
auto getJWKs = httpClient->get(source);
ConstDataRange cdr = getJWKs.getCursor();
StringData str;
cdr.readInto<StringData>(&str);
BSONObj data = fromjson(str);
_setAndValidateKeys(data);
}
JWKManager::JWKManager(BSONObj keys) {
_setAndValidateKeys(keys);
}
StatusWith<BSONObj> JWKManager::getKey(StringData keyId) const {
auto it = _keyMaterial.find(keyId.toString());
if (it == _keyMaterial.end()) {
return {ErrorCodes::NoSuchKey, str::stream() << "Unknown key '" << keyId << "'"};
}
return it->second;
}
SharedValidator JWKManager::getValidator(StringData keyId) const {
auto it = _validators->find(keyId.toString());
// TODO: SERVER-71195, refresh keys from the endpoint and try to get the validator again.
// If still no key is found throw a uassert.
uassert(ErrorCodes::NoSuchKey,
str::stream() << "Unknown key '" << keyId << "'",
it != _validators->end());
return it->second;
}
void JWKManager::_setAndValidateKeys(const BSONObj& keys) {
_validators = std::make_shared<SharedMap>();
auto keysParsed = JWKSet::parse(IDLParserContext("JWKSet"), keys);
for (const auto& key : keysParsed.getKeys()) {
auto JWK = JWK::parse(IDLParserContext("JWK"), key);
uassert(ErrorCodes::BadValue,
str::stream() << "Only RSA key types are accepted at this time",
JWK.getType() == "RSA"_sd);
uassert(ErrorCodes::BadValue, "Key ID must be non-empty", !JWK.getKeyId().empty());
auto RSAKey = JWKRSA::parse(IDLParserContext("JWKRSA"), key);
// Sanity check so that we don't load a dangerously small key.
auto N = reduceInt(RSAKey.getModulus());
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(RSAKey.getPublicExponent());
uassert(ErrorCodes::BadValue,
str::stream() << "Public key component invalid: "
<< base64url::encode(RSAKey.getPublicExponent()),
(E.size() > 1) || ((E.size() == 1) && (E[0] >= 3)));
auto keyId = RSAKey.getKeyId().toString();
uassert(ErrorCodes::DuplicateKeyId,
str::stream() << "Key IDs must be unique, duplicate '" << keyId << "'",
_keyMaterial.find(keyId) == _keyMaterial.end());
LOGV2_DEBUG(6766000, 5, "Loaded JWK Key", "kid"_attr = RSAKey.getKeyId());
_keyMaterial.insert({keyId, key.copy()});
auto swValidator = JWSValidator::create(JWK.getType(), key);
uassertStatusOK(swValidator.getStatus());
SharedValidator shValidator = std::move(swValidator.getValue());
_validators->insert({keyId, shValidator});
LOGV2_DEBUG(7070202, 3, "Loaded JWK key", "kid"_attr = keyId, "typ"_attr = JWK.getType());
}
}
std::vector<std::string> JWKManager::getKeyIds() const {
std::vector<std::string> ids;
std::transform(_validators->cbegin(),
_validators->cend(),
std::back_inserter(ids),
[](const auto& it) { return it.first; });
return ids;
}
} // namespace mongo::crypto
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