127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
/*
|
|
Minetest
|
|
Copyright (C) 2015 est31 <MTest31@outlook.com>
|
|
|
|
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 2.1 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, write to the Free Software Foundation, Inc.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <algorithm>
|
|
#include <string>
|
|
#include "auth.h"
|
|
#include "base64.h"
|
|
#include "sha1.h"
|
|
#include "srp.h"
|
|
#include "string.h"
|
|
|
|
// Get an sha-1 hash of the player's name combined with
|
|
// the password entered. That's what the server uses as
|
|
// their password. (Exception : if the password field is
|
|
// blank, we send a blank password - this is for backwards
|
|
// compatibility with password-less players).
|
|
std::string translatePassword(const std::string &name,
|
|
const std::string &password)
|
|
{
|
|
if (password.length() == 0)
|
|
return "";
|
|
|
|
std::string slt = name + password;
|
|
SHA1 sha1;
|
|
sha1.addBytes(slt.c_str(), slt.length());
|
|
unsigned char *digest = sha1.getDigest();
|
|
std::string pwd = base64_encode(digest, 20);
|
|
free(digest);
|
|
return pwd;
|
|
}
|
|
|
|
void getSRPVerifier(const std::string &name,
|
|
const std::string &password, char **salt, size_t *salt_len,
|
|
char **bytes_v, size_t *len_v)
|
|
{
|
|
std::string n_name = lowercase(name);
|
|
srp_create_salted_verification_key(SRP_SHA256, SRP_NG_2048,
|
|
n_name.c_str(), (const unsigned char *)password.c_str(),
|
|
password.size(), (unsigned char **)salt, salt_len,
|
|
(unsigned char **)bytes_v, len_v, NULL, NULL);
|
|
}
|
|
|
|
// Get a db-ready SRP verifier
|
|
// The salt param is only modifyable by this method so that you can free it
|
|
// if it was allocated. You shouldn't use it for other purposes, as you will
|
|
// need the contents of salt_len too.
|
|
inline static std::string getSRPVerifier(const std::string &name,
|
|
const std::string &password, char ** salt, size_t salt_len)
|
|
{
|
|
char * bytes_v = NULL;
|
|
size_t len_v;
|
|
getSRPVerifier(name, password, salt, &salt_len,
|
|
&bytes_v, &len_v);
|
|
std::string ret_val = encodeSRPVerifier(std::string(bytes_v, len_v),
|
|
std::string(*salt, salt_len));
|
|
free(bytes_v);
|
|
return ret_val;
|
|
}
|
|
|
|
// Get a db-ready SRP verifier
|
|
std::string getSRPVerifier(const std::string &name,
|
|
const std::string &password)
|
|
{
|
|
char * salt = NULL;
|
|
std::string ret_val = getSRPVerifier(name,
|
|
password, &salt, 0);
|
|
free(salt);
|
|
return ret_val;
|
|
}
|
|
|
|
// Get a db-ready SRP verifier
|
|
std::string getSRPVerifier(const std::string &name,
|
|
const std::string &password, const std::string &salt)
|
|
{
|
|
// The implementation won't change the salt if its set,
|
|
// therefore we can cast.
|
|
char *salt_cstr = (char *)salt.c_str();
|
|
return getSRPVerifier(name, password,
|
|
&salt_cstr, salt.size());
|
|
}
|
|
|
|
// Make a SRP verifier db-ready
|
|
std::string encodeSRPVerifier(const std::string &verifier,
|
|
const std::string &salt)
|
|
{
|
|
std::ostringstream ret_str;
|
|
ret_str << "#1#"
|
|
<< base64_encode((unsigned char*) salt.c_str(), salt.size()) << "#"
|
|
<< base64_encode((unsigned char*) verifier.c_str(), verifier.size());
|
|
return ret_str.str();
|
|
}
|
|
|
|
bool decodeSRPVerifier(const std::string &enc_pwd,
|
|
std::string *salt, std::string *bytes_v)
|
|
{
|
|
std::vector<std::string> pwd_components = str_split(enc_pwd, '#');
|
|
|
|
if ((pwd_components.size() != 4)
|
|
|| (pwd_components[1] != "1") // 1 means srp
|
|
|| !base64_is_valid(pwd_components[2])
|
|
|| !base64_is_valid(pwd_components[3]))
|
|
return false;
|
|
|
|
std::string salt_str = base64_decode(pwd_components[2]);
|
|
std::string bytes_v_str = base64_decode(pwd_components[3]);
|
|
*salt = salt_str;
|
|
*bytes_v = bytes_v_str;
|
|
return true;
|
|
|
|
}
|