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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kAccessControl
#include "mongo/platform/basic.h"
#include "mongo/db/auth/security_key.h"
#include <string>
#include <sys/stat.h>
#include <vector>
#include "mongo/base/status_with.h"
#include "mongo/client/authenticate.h"
#include "mongo/crypto/mechanism_scram.h"
#include "mongo/crypto/sha1_block.h"
#include "mongo/crypto/sha256_block.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/auth/sasl_command_constants.h"
#include "mongo/db/auth/sasl_options.h"
#include "mongo/db/auth/sasl_scram_server_conversation.h"
#include "mongo/db/auth/security_file.h"
#include "mongo/db/auth/user.h"
#include "mongo/db/server_options.h"
#include "mongo/util/icu.h"
#include "mongo/util/log.h"
#include "mongo/util/password_digest.h"
namespace mongo {
namespace {
constexpr size_t kMinKeyLength = 6;
constexpr size_t kMaxKeyLength = 1024;
class CredentialsGenerator {
public:
explicit CredentialsGenerator(StringData filename)
: _salt1(scram::Presecrets<SHA1Block>::generateSecureRandomSalt()),
_salt256(scram::Presecrets<SHA256Block>::generateSecureRandomSalt()),
_filename(filename) {}
boost::optional<User::CredentialData> generate(const std::string& password) {
if (password.size() < kMinKeyLength || password.size() > kMaxKeyLength) {
error() << " security key in " << _filename << " has length " << password.size()
<< ", must be between 6 and 1024 chars";
return boost::none;
}
auto swSaslPassword = icuSaslPrep(password);
if (!swSaslPassword.isOK()) {
error() << "Could not prep security key file for SCRAM-SHA-256: "
<< swSaslPassword.getStatus();
return boost::none;
}
const auto passwordDigest = mongo::createPasswordDigest(
internalSecurity.user->getName().getUser().toString(), password);
User::CredentialData credentials;
if (!_copyCredentials(
credentials.scram_sha1,
scram::Secrets<SHA1Block>::generateCredentials(
_salt1, passwordDigest, saslGlobalParams.scramSHA1IterationCount.load())))
return boost::none;
if (!_copyCredentials(credentials.scram_sha256,
scram::Secrets<SHA256Block>::generateCredentials(
_salt256,
swSaslPassword.getValue(),
saslGlobalParams.scramSHA256IterationCount.load())))
return boost::none;
return credentials;
}
private:
template <typename CredsTarget, typename CredsSource>
bool _copyCredentials(CredsTarget&& target, const CredsSource&& source) {
target.iterationCount = source[scram::kIterationCountFieldName].Int();
target.salt = source[scram::kSaltFieldName].String();
target.storedKey = source[scram::kStoredKeyFieldName].String();
target.serverKey = source[scram::kServerKeyFieldName].String();
if (!target.isValid()) {
error() << "Could not generate valid credentials from key in " << _filename;
return false;
}
return true;
}
const std::vector<uint8_t> _salt1;
const std::vector<uint8_t> _salt256;
const StringData _filename;
};
} // namespace
using std::string;
bool setUpSecurityKey(const string& filename) {
auto swKeyStrings = mongo::readSecurityFile(filename);
if (!swKeyStrings.isOK()) {
log() << swKeyStrings.getStatus().reason();
return false;
}
auto keyStrings = std::move(swKeyStrings.getValue());
if (keyStrings.size() > 2) {
error() << "Only two keys are supported in the security key file, " << keyStrings.size()
<< " are specified in " << filename;
return false;
}
CredentialsGenerator generator(filename);
auto credentials = generator.generate(keyStrings.front());
if (!credentials) {
return false;
}
internalSecurity.user->setCredentials(std::move(*credentials));
if (keyStrings.size() == 2) {
credentials = generator.generate(keyStrings[1]);
if (!credentials) {
return false;
}
internalSecurity.alternateCredentials = std::move(*credentials);
}
int clusterAuthMode = serverGlobalParams.clusterAuthMode.load();
if (clusterAuthMode == ServerGlobalParams::ClusterAuthMode_keyFile ||
clusterAuthMode == ServerGlobalParams::ClusterAuthMode_sendKeyFile) {
auth::setInternalAuthKeys(keyStrings);
}
return true;
}
} // namespace mongo
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