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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2008 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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
* General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/
class Auth_Basic_Driver implements Auth_Driver {
// Configuration
protected $_config;
/**
* Instantiate the Driver and initialize it's configuration.
*/
public function __construct($config = array()) {
// Load config
$config += Kohana::config('basic_auth');
// Clean up the salt pattern and split it into an array
$config['salt_pattern'] = preg_split('/,\s*/', $config['salt_pattern']);
$this->_config = $config;
Kohana::log('debug', 'Auth_Basic_Driver Library initialized');
}
/**
* @see Auth_Driver::set_user_password
*
* @param int $user_id
* @param string $password
* @return void
*/
public function set_user_password($user_id, $password_text) {
$password = ORM::factory("password")->where('user_id', $user_id)->find();
$password->password = $this->_hash_password($password_text);
if (empty($password->user_id)) {
$password->user_id = $user_id;
}
$password->save();
}
/**
* Validates a user id password combination.
*
* @param int user_id
* @param string password
* @return boolean
*/
public function is_valid_password($user_id, $password_text) {
$password = ORM::factory("password")
->where('user_id', $user_id)
->find();
if ($password->loaded != true) {
return false;
}
// Get the salt from the stored password
$salt = $this->_find_salt($password->password);
$hashed = $this->_hash_password($password_text, $salt);
return $hashed === $password->password;
}
/**
* Creates a hashed password from a plaintext password, inserting salt
* based on the configured salt pattern.
*
* @param string plaintext password
* @return string hashed password string
*/
private function _hash_password($password, $salt = FALSE) {
if ($salt === FALSE) {
// Create a salt seed, same length as the number of offsets in the pattern
$salt = substr($this->_hash(uniqid(NULL, TRUE)), 0, count($this->_config['salt_pattern']));
}
// Password hash that the salt will be inserted into
$hash = $this->_hash($salt . $password);
// Change salt to an array
$salt = str_split($salt, 1);
// Returned password
$password = '';
// Used to calculate the length of splits
$last_offset = 0;
foreach ($this->_config['salt_pattern'] as $offset) {
// Split a new part of the hash off
$part = substr($hash, 0, $offset - $last_offset);
// Cut the current part out of the hash
$hash = substr($hash, $offset - $last_offset);
// Add the part to the password, appending the salt character
$password .= $part . array_shift($salt);
// Set the last offset to the current offset
$last_offset = $offset;
}
// Return the password, with the remaining hash appended
return $password . $hash;
}
/**
* Perform a hash, using the configured method.
*
* @param string string to hash
* @return string
*/
private function _hash($str) {
return hash($this->_config['hash_method'], $str);
}
/**
* Finds the salt from a password, based on the configured salt pattern.
*
* @param string hashed password
* @return string
*/
private function _find_salt($password) {
$salt = '';
foreach ($this->_config['salt_pattern'] as $i => $offset) {
// Find salt characters... take a good long look..
$salt .= substr($password, $offset + $i, 1);
}
return $salt;
}
}
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