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/*
* Copyright (C) 2014 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/platform/basic.h"
#include <string>
#include "mongo/db/auth/sasl_plain_server_conversation.h"
#include "mongo/base/init.h"
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/crypto/mechanism_scram.h"
#include "mongo/db/auth/sasl_mechanism_registry.h"
#include "mongo/db/auth/user.h"
#include "mongo/util/base64.h"
#include "mongo/util/password_digest.h"
#include "mongo/util/text.h"
namespace mongo {
namespace {
template <typename HashBlock>
StatusWith<bool> trySCRAM(const User::CredentialData& credentials, StringData pwd) {
const auto scram = credentials.scram<HashBlock>();
if (!scram.isValid()) {
// No stored credentials available.
return false;
}
const auto decodedSalt = base64::decode(scram.salt);
scram::Secrets<HashBlock> secrets(scram::Presecrets<HashBlock>(
pwd.toString(),
std::vector<std::uint8_t>(reinterpret_cast<const std::uint8_t*>(decodedSalt.c_str()),
reinterpret_cast<const std::uint8_t*>(decodedSalt.c_str()) +
decodedSalt.size()),
scram.iterationCount));
if (scram.storedKey != base64::encode(reinterpret_cast<const char*>(secrets.storedKey().data()),
secrets.storedKey().size())) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream() << "Incorrect user name or password");
}
return true;
}
} // namespace
StatusWith<std::tuple<bool, std::string>> SASLPlainServerMechanism::stepImpl(
OperationContext* opCtx, StringData inputData) {
if (_authenticationDatabase == "$external") {
return Status(ErrorCodes::AuthenticationFailed,
"PLAIN mechanism must be used with internal users");
}
AuthorizationManager* authManager = AuthorizationManager::get(opCtx->getServiceContext());
// Expecting user input on the form: [authz-id]\0authn-id\0pwd
std::string input = inputData.toString();
SecureAllocatorAuthDomain::SecureString pwd = "";
try {
size_t firstNull = inputData.find('\0');
if (firstNull == std::string::npos) {
return Status(
ErrorCodes::AuthenticationFailed,
str::stream()
<< "Incorrectly formatted PLAIN client message, missing first NULL delimiter");
}
size_t secondNull = inputData.find('\0', firstNull + 1);
if (secondNull == std::string::npos) {
return Status(
ErrorCodes::AuthenticationFailed,
str::stream()
<< "Incorrectly formatted PLAIN client message, missing second NULL delimiter");
}
std::string authorizationIdentity = input.substr(0, firstNull);
ServerMechanismBase::_principalName =
input.substr(firstNull + 1, (secondNull - firstNull) - 1);
if (ServerMechanismBase::_principalName.empty()) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream()
<< "Incorrectly formatted PLAIN client message, empty username");
} else if (!authorizationIdentity.empty() &&
authorizationIdentity != ServerMechanismBase::_principalName) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream()
<< "SASL authorization identity must match authentication identity");
}
pwd = SecureAllocatorAuthDomain::SecureString(input.substr(secondNull + 1).c_str());
if (pwd->empty()) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream()
<< "Incorrectly formatted PLAIN client message, empty password");
}
} catch (std::out_of_range&) {
return Status(ErrorCodes::AuthenticationFailed,
mongoutils::str::stream() << "Incorrectly formatted PLAIN client message");
}
User* userObj;
// The authentication database is also the source database for the user.
Status status = authManager->acquireUser(
opCtx, UserName(ServerMechanismBase::_principalName, _authenticationDatabase), &userObj);
if (!status.isOK()) {
return status;
}
const auto creds = userObj->getCredentials();
authManager->releaseUser(userObj);
const auto sha256Status = trySCRAM<SHA256Block>(creds, pwd->c_str());
if (!sha256Status.isOK()) {
return sha256Status.getStatus();
}
if (sha256Status.getValue()) {
return std::make_tuple(true, std::string());
}
const auto authDigest = createPasswordDigest(ServerMechanismBase::_principalName, pwd->c_str());
const auto sha1Status = trySCRAM<SHA1Block>(creds, authDigest);
if (!sha1Status.isOK()) {
return sha1Status.getStatus();
}
if (sha1Status.getValue()) {
return std::make_tuple(true, std::string());
}
return Status(ErrorCodes::AuthenticationFailed, str::stream() << "No credentials available.");
return std::make_tuple(true, std::string());
}
namespace {
GlobalSASLMechanismRegisterer<PLAINServerFactory> plainRegisterer;
} // namespace
} // namespace mongo
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