/usr/share/php/kohana2/modules/auth/libraries/Auth.php is in libkohana2-modules-php 2.3.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* User authorization library. Handles user login and logout, as well as secure
* password hashing.
*
* @package Auth
* @author Kohana Team
* @copyright (c) 2007 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Auth_Core {
// Session instance
protected $session;
// Configuration
protected $config;
/**
* Create an instance of Auth.
*
* @return object
*/
public static function factory($config = array())
{
return new Auth($config);
}
/**
* Return a static instance of Auth.
*
* @return object
*/
public static function instance($config = array())
{
static $instance;
// Load the Auth instance
empty($instance) and $instance = new Auth($config);
return $instance;
}
/**
* Loads Session and configuration options.
*
* @return void
*/
public function __construct($config = array())
{
// Append default auth configuration
$config += Kohana::config('auth');
// Clean up the salt pattern and split it into an array
$config['salt_pattern'] = preg_split('/,\s*/', Kohana::config('auth.salt_pattern'));
// Save the config in the object
$this->config = $config;
// Set the driver class name
$driver = 'Auth_'.$config['driver'].'_Driver';
if ( ! Kohana::auto_load($driver))
throw new Kohana_Exception('core.driver_not_found', $config['driver'], get_class($this));
// Load the driver
$driver = new $driver($config);
if ( ! ($driver instanceof Auth_Driver))
throw new Kohana_Exception('core.driver_implements', $config['driver'], get_class($this), 'Auth_Driver');
// Load the driver for access
$this->driver = $driver;
Kohana::log('debug', 'Auth Library loaded');
}
/**
* Check if there is an active session. Optionally allows checking for a
* specific role.
*
* @param string role name
* @return boolean
*/
public function logged_in($role = NULL)
{
return $this->driver->logged_in($role);
}
/**
* Returns the currently logged in user, or FALSE.
*
* @return mixed
*/
public function get_user()
{
return $this->driver->get_user();
}
/**
* Attempt to log in a user by using an ORM object and plain-text password.
*
* @param string username to log in
* @param string password to check against
* @param boolean enable auto-login
* @return boolean
*/
public function login($username, $password, $remember = FALSE)
{
if (empty($password))
return FALSE;
if (is_string($password))
{
// Get the salt from the stored password
$salt = $this->find_salt($this->driver->password($username));
// Create a hashed password using the salt from the stored password
$password = $this->hash_password($password, $salt);
}
return $this->driver->login($username, $password, $remember);
}
/**
* Attempt to automatically log a user in.
*
* @return boolean
*/
public function auto_login()
{
return $this->driver->auto_login();
}
/**
* Force a login for a specific username.
*
* @param mixed username
* @return boolean
*/
public function force_login($username)
{
return $this->driver->force_login($username);
}
/**
* Log out a user by removing the related session variables.
*
* @param boolean completely destroy the session
* @return boolean
*/
public function logout($destroy = FALSE)
{
return $this->driver->logout($destroy);
}
/**
* 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
*/
public 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
*/
public function hash($str)
{
return hash($this->config['hash_method'], $str);
}
/**
* Finds the salt from a password, based on the configured salt pattern.
*
* @param string hashed password
* @return string
*/
public function find_salt($password)
{
$salt = '';
foreach ($this->config['salt_pattern'] as $i => $offset)
{
// Find salt characters, take a good long look...
$salt .= $password[$offset + $i];
}
return $salt;
}
} // End Auth
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