gnu-social/plugins/AuthCrypt/AuthCryptPlugin.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Plugin to use crypt() for user password hashes
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 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/>.
*
* @category Plugin
* @package GNUsocial
* @author Mikael Nordfeldth <mmn@hethane.se>
* @copyright 2012 StatusNet, Inc.
* @copyright 2013 Free Software Foundation, Inc http://www.fsf.org
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://www.gnu.org/software/social/
*/
if (!defined('GNUSOCIAL')) { exit(1); }
class AuthCryptPlugin extends AuthenticationPlugin
{
const PLUGIN_VERSION = '2.0.0';
protected $hash = '$6$'; // defaults to SHA512, i.e. '$6$', in onInitializePlugin()
protected $statusnet = true; // if true, also check StatusNet style password hash
protected $overwrite = true; // if true, password change means overwrite with crypt()
protected $argon = false; // Use Argon if supported.
public $provider_name = 'password_hash'; // not actually used
/*
* FUNCTIONALITY
*/
function checkPassword($username, $password)
{
$username = Nickname::normalize($username);
$user = User::getKV('nickname', $username);
if (!($user instanceof User)) {
return false;
}
// Timing safe password verification on supported PHP versions
if (function_exists('password_verify')) {
if (password_verify($password, $user->password)) {
return $user;
}
}
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// crypt understands what the salt part of $user->password is
if ($user->password === crypt($password, $user->password)) {
// and update password hash entry to password_hash() compatible
if ($this->overwrite && function_exists('password_hash')) {
$this->changePassword($user->nickname, null, $password);
}
return $user;
}
// If we check StatusNet hash, for backwards compatibility and migration
if ($this->statusnet && $user->password === md5($password . $user->id)) {
// and update password hash entry to crypt() compatible
if ($this->overwrite && function_exists('password_hash')) {
$this->changePassword($user->nickname, null, $password);
}
return $user;
}
return false;
}
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protected function cryptSalt($len=CRYPT_SALT_LENGTH)
{
$chars = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
$salt = '';
for ($i=0; $i<$len; $i++) {
$salt .= $chars{mt_rand(0, strlen($chars)-1)};
}
return $salt;
}
// $oldpassword is already verified when calling this function... shouldn't this be private?!
function changePassword($username, $oldpassword, $newpassword)
{
$username = Nickname::normalize($username);
if (!$this->password_changeable) {
return false;
}
$user = User::getKV('nickname', $username);
if (empty($user)) {
return false;
}
$original = clone($user);
$user->password = $this->hashPassword($newpassword, $user->getProfile());
return (true === $user->validate() && $user->update($original));
}
public function hashPassword($password, Profile $profile=null)
{
if(function_exists('password_hash')) {
$algorithm = PASSWORD_DEFAULT;
if($this->argon && version_compare(PHP_VERSION, '7.2.0') == 1) {
$algorithm = PASSWORD_ARGON2I;
}
// Use the modern password hashing algorithm
// http://php.net/manual/en/function.password-hash.php
// Uses PASSWORD_BCRYPT by default, with PASSWORD_ARGON2I being the next possible default in future versions
return password_hash($password, $algorithm);
} else {
// Fallback to previous hashing function if phpversion() < 5.5
// A new, unique salt per new record stored...
return crypt($password, $this->hash . self::cryptSalt());
}
}
/*
* EVENTS
*/
public function onStartChangePassword(Profile $target, $oldpassword, $newpassword)
{
if (!$this->checkPassword($target->getNickname(), $oldpassword)) {
// if we ARE in overwrite mode, test password with common_check_user
if (!$this->overwrite || !common_check_user($target->getNickname(), $oldpassword)) {
// either we're not in overwrite mode, or the password was incorrect
return !$this->authoritative;
}
// oldpassword was apparently ok
}
$changed = $this->changePassword($target->getNickname(), $oldpassword, $newpassword);
return (!$changed && empty($this->authoritative));
}
public function onStartCheckPassword($nickname, $password, &$authenticatedUser)
{
$authenticatedUser = $this->checkPassword($nickname, $password);
// if we failed, only return false to stop plugin execution if we're authoritative
return (!($authenticatedUser instanceof User) && empty($this->authoritative));
}
public function onStartHashPassword(&$hashed, $password, Profile $profile=null)
{
$hashed = $this->hashPassword($password, $profile);
return false;
}
public function onCheckSchema()
{
// we only use the User database, so default AuthenticationPlugin stuff can be ignored
return true;
}
public function onUserDeleteRelated($user, &$tables)
{
// not using User_username table, so no need to add it here.
return true;
}
public function onPluginVersion(array &$versions)
{
$versions[] = array('name' => 'AuthCrypt',
'version' => self::PLUGIN_VERSION,
'author' => 'Mikael Nordfeldth',
'homepage' => 'https://git.gnu.io/gnu/gnu-social/tree/master/plugins/AuthCrypt',
'rawdescription' =>
// TRANS: Plugin description.
_m('Authentication and password hashing with crypt()'));
return true;
}
}