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/*
* AuthBackendChallengeResponse.cpp
*
* Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "AuthBackendChallengeResponse.h"
#include <Common/Hash.h>
namespace Mad {
namespace Modules {
namespace AuthBackendChallengeResponse {
const std::string AuthBackendChallengeResponse::methodName = "Challenge-Response";
AuthBackendChallengeResponse::AuthContextChallengeResponse::AuthContextChallengeResponse(AuthBackendChallengeResponse *backend) : authenticated(false) {
challenge.reserve(32);
for(int i = 0; i < 32; ++i)
challenge.push_back(backend->randomGenerator());
}
boost::shared_ptr<Common::AuthContext> AuthBackendChallengeResponse::authenticate(boost::shared_ptr<Common::AuthProvider> provider, const std::string &subMethod,
const std::string &user, const std::vector<boost::uint8_t> &data, std::vector<boost::uint8_t> &response,
boost::shared_ptr<Common::AuthContext> context) throw(Core::Exception) {
if(context && dynamic_cast<AuthContextChallengeResponse*>(context.get()) == 0)
throw(Core::Exception(Core::Exception::INVALID_INPUT));
std::vector<std::string> allowedMethods = getSubMethods(provider);
if(std::find(allowedMethods.begin(), allowedMethods.end(), subMethod) == allowedMethods.end())
throw(Core::Exception(Core::Exception::INVALID_INPUT));
if(!context) {
boost::shared_ptr<AuthContextChallengeResponse> contextCR(new AuthContextChallengeResponse(this));
context = contextCR;
response.insert(response.end(), contextCR->challenge.begin(), contextCR->challenge.end());
}
else {
boost::shared_ptr<AuthContextChallengeResponse> contextCR = boost::dynamic_pointer_cast<AuthContextChallengeResponse>(context);
std::vector<boost::uint8_t> password = provider->getPassword(user, subMethod);
if(password.empty())
throw Core::Exception(Core::Exception::AUTHENTICATION);
password.insert(password.end(), contextCR->challenge.begin(), contextCR->challenge.end());
password = Common::Hash::hash(password, subMethod);
if(password.size() != data.size() || !std::equal(password.begin(), password.end(), data.begin()))
throw Core::Exception(Core::Exception::AUTHENTICATION);
contextCR->authenticated = true;
}
return context;
}
}
}
}
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