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#include "auth.h"
#include <crypt.h>
#include <string.h>
#include <stdexcept>
#include <iostream>
// crypt specified password
std::string Auth::generate(const std::string& pw)
{
struct crypt_data data;
memset((void *)&data, '\0', sizeof(data));
char setting[1000];
if (crypt_gensalt_rn("$6$", 2000, nullptr, 0, setting, sizeof(setting)) == nullptr)
throw std::runtime_error("Error on crypt_gensalt_r()");
char* result;
if ((result = crypt_r(pw.data(), setting, &data)) == nullptr)
throw std::runtime_error("Error on crypt_r()");
return result;
}
// validate specified password against crypted hash
bool Auth::validate(const std::string& crypted, const std::string& pw)
{
struct crypt_data data;
memset((void *)&data, '\0', sizeof(data));
size_t pos = crypted.find_last_of('$');
if (pos == crypted.npos) {
std::cerr << "Warning: Bad password hash configured (format)" << std::endl;
return false;
}
std::string setting{crypted.substr(0, pos)};
char* output;
if ((output = crypt_r(pw.data(), setting.data(), &data)) == nullptr) {
std::cerr << "Warning: Error on crypt_r()" << std::endl;
return false;
}
return crypted == output;
}
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