111 rindas
2.7 KiB
C++
111 rindas
2.7 KiB
C++
#include <atomic>
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#include <openssl/evp.h>
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#include <mutex>
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#include "utils.h"
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#include "authenticator.h"
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#include "logger.h"
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struct LoginFail
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{
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std::mutex mutex;
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std::atomic<unsigned int> count;
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time_t lastfail;
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};
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static std::map<std::string, LoginFail> loginFails;
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Authenticator::Authenticator(UserDao &userDao)
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{
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this->userDao = &userDao;
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}
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// TODO: make failure counter configurable
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bool Authenticator::isBanned(std::string ip)
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{
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if(loginFails.contains(ip))
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{
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LoginFail &fl = loginFails[ip];
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std::lock_guard<std::mutex> lock(fl.mutex);
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return fl.count > 5 && (time(nullptr) - fl.lastfail) < 1200;
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}
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return false;
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}
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void Authenticator::incFailureCount(std::string ip)
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{
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LoginFail &fl = loginFails[ip];
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fl.count += 1;
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fl.lastfail = time(nullptr);
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}
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std::vector<char> Authenticator::pbkdf5(std::string password, const std::vector<char> &salt) const
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{
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unsigned char hash[32];
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const EVP_MD *sha256 = EVP_sha256();
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const unsigned char *rawsalt = reinterpret_cast<const unsigned char *>(salt.data());
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int ret =
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PKCS5_PBKDF2_HMAC(password.c_str(), password.size(), rawsalt, salt.size(), 300000, sha256, sizeof(hash), hash);
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if(ret != 1)
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{
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Logger::error() << "Authenticator: pbkdf5: Failed to create hash";
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return {};
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}
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std::vector<char> result;
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for(size_t i = 0; i < sizeof(hash); i++)
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{
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result.push_back(static_cast<char>(hash[i]));
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}
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return result;
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}
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std::variant<User, AuthenticationError> Authenticator::authenticate(std::string username, std::string password)
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{
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std::optional<User> user = userDao->find(username);
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if(user)
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{
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if(user->enabled)
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{
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auto hashresult = pbkdf5(password, user.value().salt);
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if(hashresult.size() == 0)
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{
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return AuthenticationError::GeneralError;
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}
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// TODO: timing attack (even though practical relevancy questionable)
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if(hashresult == user.value().password)
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{
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return user.value();
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}
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return AuthenticationError::PasswordNotMatch;
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}
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return AuthenticationError::UserDisabled;
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}
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return AuthenticationError::UserNotFound;
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}
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std::variant<User, AuthenticationError> Authenticator::authenticate(std::string username, std::string password,
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std::string ip)
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{
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if(isBanned(ip))
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{
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return AuthenticationError::BannedIP;
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}
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std::variant<User, AuthenticationError> authresult = authenticate(username, password);
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if(std::holds_alternative<AuthenticationError>(authresult))
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{
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AuthenticationError error = std::get<AuthenticationError>(authresult);
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if(error == AuthenticationError::PasswordNotMatch)
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{
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incFailureCount(ip);
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}
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return error;
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}
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return std::get<User>(authresult);
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}
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std::vector<char> Authenticator::hash(std::string password, const std::vector<char> &salt)
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{
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return this->pbkdf5(password, salt);
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}
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