<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014-2019 British Columbia Institute of Technology
* Copyright (c) 2019-2020 CodeIgniter Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author CodeIgniter Dev Team
* @copyright 2019-2020 CodeIgniter Foundation
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 4.0.0
* @filesource
*/
namespace CodeIgniter\Session;
use Psr\Log\LoggerAwareTrait;
/**
* Implementation of CodeIgniter session container.
*
* Session configuration is done through session variables and cookie related
* variables in app/config/App.php
*/
class Session implements SessionInterface
{
use LoggerAwareTrait;
/**
* Instance of the driver to use.
*
* @var \CodeIgniter\Log\Handlers\HandlerInterface
*/
protected $driver;
/**
* The storage driver to use: files, database, redis, memcached
*
* @var string
*/
protected $sessionDriverName;
/**
* The session cookie name, must contain only [0-9a-z_-] characters.
*
* @var string
*/
protected $sessionCookieName = 'ci_session';
/**
* The number of SECONDS you want the session to last.
* Setting it to 0 (zero) means expire when the browser is closed.
*
* @var integer
*/
protected $sessionExpiration = 7200;
/**
* The location to save sessions to, driver dependent..
*
* For the 'files' driver, it's a path to a writable directory.
* WARNING: Only absolute paths are supported!
*
* For the 'database' driver, it's a table name.
*
* TODO: address memcache & redis needs
*
* IMPORTANT: You are REQUIRED to set a valid save path!
*
* @var string
*/
protected $sessionSavePath;
/**
* Whether to match the user's IP address when reading the session data.
*
* WARNING: If you're using the database driver, don't forget to update
* your session table's PRIMARY KEY when changing this setting.
*
* @var boolean
*/
protected $sessionMatchIP = false;
/**
* How many seconds between CI regenerating the session ID.
*
* @var integer
*/
protected $sessionTimeToUpdate = 300;
/**
* Whether to destroy session data associated with the old session ID
* when auto-regenerating the session ID. When set to FALSE, the data
* will be later deleted by the garbage collector.
*
* @var boolean
*/
protected $sessionRegenerateDestroy = false;
/**
* The domain name to use for cookies.
* Set to .your-domain.com for site-wide cookies.
*
* @var string
*/
protected $cookieDomain = '';
/**
* Path used for storing cookies.
* Typically will be a forward slash.
*
* @var string
*/
protected $cookiePath = '/';
/**
* Cookie will only be set if a secure HTTPS connection exists.
*
* @var boolean
*/
protected $cookieSecure = false;
/**
* sid regex expression
*
* @var string
*/
protected $sidRegexp;
/**
* Logger instance to record error messages and warnings.
*
* @var \PSR\Log\LoggerInterface
*/
protected $logger;
//--------------------------------------------------------------------
/**
* Constructor.
*
* Extract configuration settings and save them here.
*
* @param \SessionHandlerInterface $driver
* @param \Config\App $config
*/
public function __construct(\SessionHandlerInterface $driver, $config)
{
$this->driver = $driver;
$this->sessionDriverName = $config->sessionDriver;
$this->sessionCookieName = $config->sessionCookieName;
$this->sessionExpiration = $config->sessionExpiration;
$this->sessionSavePath = $config->sessionSavePath;
$this->sessionMatchIP = $config->sessionMatchIP;
$this->sessionTimeToUpdate = $config->sessionTimeToUpdate;
$this->sessionRegenerateDestroy = $config->sessionRegenerateDestroy;
$this->cookieDomain = $config->cookieDomain;
$this->cookiePath = $config->cookiePath;
$this->cookieSecure = $config->cookieSecure;
helper('array');
}
//--------------------------------------------------------------------
/**
* Initialize the session container and starts up the session.
*
* @return mixed
*/
public function start()
{
if (is_cli() && ENVIRONMENT !== 'testing')
{
// @codeCoverageIgnoreStart
$this->logger->debug('Session: Initialization under CLI aborted.');
return;
// @codeCoverageIgnoreEnd
}
elseif ((bool) ini_get('session.auto_start'))
{
$this->logger->error('Session: session.auto_start is enabled in php.ini. Aborting.');
return;
}
elseif (session_status() === PHP_SESSION_ACTIVE)
{
$this->logger->warning('Session: Sessions is enabled, and one exists.Please don\'t $session->start();');
return;
}
if (! $this->driver instanceof \SessionHandlerInterface)
{
$this->logger->error("Session: Handler '" . $this->driver .
"' doesn't implement SessionHandlerInterface. Aborting.");
}
$this->configure();
$this->setSaveHandler();
// Sanitize the cookie, because apparently PHP doesn't do that for userspace handlers
if (isset($_COOKIE[$this->sessionCookieName]) && (
! is_string($_COOKIE[$this->sessionCookieName]) || ! preg_match('#\A' . $this->sidRegexp . '\z#', $_COOKIE[$this->sessionCookieName])
)
)
{
unset($_COOKIE[$this->sessionCookieName]);
}
$this->startSession();
// Is session ID auto-regeneration configured? (ignoring ajax requests)
if ((empty($_SERVER['HTTP_X_REQUESTED_WITH']) ||
strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) !== 'xmlhttprequest') && ($regenerate_time = $this->sessionTimeToUpdate) > 0
)
{
if (! isset($_SESSION['__ci_last_regenerate']))
{
$_SESSION['__ci_last_regenerate'] = time();
}
elseif ($_SESSION['__ci_last_regenerate'] < (time() - $regenerate_time))
{
$this->regenerate((bool) $this->sessionRegenerateDestroy);
}
}
// Another work-around ... PHP doesn't seem to send the session cookie
// unless it is being currently created or regenerated
elseif (isset($_COOKIE[$this->sessionCookieName]) && $_COOKIE[$this->sessionCookieName] === session_id())
{
$this->setCookie();
}
$this->initVars();
$this->logger->info("Session: Class initialized using '" . $this->sessionDriverName . "' driver.");
return $this;
}
//--------------------------------------------------------------------
/**
* Does a full stop of the session:
*
* - destroys the session
* - unsets the session id
* - destroys the session cookie
*/
public function stop()
{
setcookie(
$this->sessionCookieName, session_id(), 1, $this->cookiePath, $this->cookieDomain, $this->cookieSecure, true
);
session_regenerate_id(true);
}
//--------------------------------------------------------------------
/**
* Configuration.
*
* Handle input binds and configuration defaults.
*/
protected function configure()
{
if (empty($this->sessionCookieName))
{
$this->sessionCookieName = ini_get('session.name');
}
else
{
ini_set('session.name', $this->sessionCookieName);
}
session_set_cookie_params(
$this->sessionExpiration, $this->cookiePath, $this->cookieDomain, $this->cookieSecure, true // HTTP only; Yes, this is intentional and not configurable for security reasons.
);
//if (empty($this->sessionExpiration))
if (! isset($this->sessionExpiration))
{
$this->sessionExpiration = (int) ini_get('session.gc_maxlifetime');
}
else
{
ini_set('session.gc_maxlifetime', (int) $this->sessionExpiration);
}
if (! empty($this->sessionSavePath))
{
ini_set('session.save_path', $this->sessionSavePath);
}
// Security is king
ini_set('session.use_trans_sid', 0);
ini_set('session.use_strict_mode', 1);
ini_set('session.use_cookies', 1);
ini_set('session.use_only_cookies', 1);
$this->configureSidLength();
}
// ------------------------------------------------------------------------
/**
* Configure session ID length
*
* To make life easier, we used to force SHA-1 and 4 bits per
* character on everyone. And of course, someone was unhappy.
*
* Then PHP 7.1 broke backwards-compatibility because ext/session
* is such a mess that nobody wants to touch it with a pole stick,
* and the one guy who does, nobody has the energy to argue with.
*
* So we were forced to make changes, and OF COURSE something was
* going to break and now we have this pile of shit. -- Narf
*
* @return void
*/
protected function configureSidLength()
{
$bits_per_character = (int) (ini_get('session.sid_bits_per_character') !== false
? ini_get('session.sid_bits_per_character')
: 4);
$sid_length = (int) (ini_get('session.sid_length') !== false
? ini_get('session.sid_length')
: 40);
if (($sid_length * $bits_per_character) < 160)
{
$bits = ($sid_length * $bits_per_character);
// Add as many more characters as necessary to reach at least 160 bits
$sid_length += (int) ceil((160 % $bits) / $bits_per_character);
ini_set('session.sid_length', $sid_length);
}
// Yes, 4,5,6 are the only known possible values as of 2016-10-27
switch ($bits_per_character)
{
case 4:
$this->sidRegexp = '[0-9a-f]';
break;
case 5:
$this->sidRegexp = '[0-9a-v]';
break;
case 6:
$this->sidRegexp = '[0-9a-zA-Z,-]';
break;
}
$this->sidRegexp .= '{' . $sid_length . '}';
}
//--------------------------------------------------------------------
/**
* Handle temporary variables
*
* Clears old "flash" data, marks the new one for deletion and handles
* "temp" data deletion.
*/
protected function initVars()
{
if (empty($_SESSION['__ci_vars']))
{
return;
}
$current_time = time();
foreach ($_SESSION['__ci_vars'] as $key => &$value)
{
if ($value === 'new')
{
$_SESSION['__ci_vars'][$key] = 'old';
}
// Hacky, but 'old' will (implicitly) always be less than time() ;)
// DO NOT move this above the 'new' check!
elseif ($value < $current_time)
{
unset($_SESSION[$key], $_SESSION['__ci_vars'][$key]);
}
}
if (empty($_SESSION['__ci_vars']))
{
unset($_SESSION['__ci_vars']);
}
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
// Session Utility Methods
//--------------------------------------------------------------------
/**
* Regenerates the session ID.
*
* @param boolean $destroy Should old session data be destroyed?
*/
public function regenerate(bool $destroy = false)
{
$_SESSION['__ci_last_regenerate'] = time();
session_regenerate_id($destroy);
}
//--------------------------------------------------------------------
/**
* Destroys the current session.
*/
public function destroy()
{
session_destroy();
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
// Basic Setters and Getters
//--------------------------------------------------------------------
/**
* Sets user data into the session.
*
* If $data is a string, then it is interpreted as a session property
* key, and $value is expected to be non-null.
*
* If $data is an array, it is expected to be an array of key/value pairs
* to be set as session properties.
*
* @param string|array $data Property name or associative array of properties
* @param string|array $value Property value if single key provided
*/
public function set($data, $value = null)
{
if (is_array($data))
{
foreach ($data as $key => &$value)
{
if (is_int($key))
{
$_SESSION[$value] = null;
}
else
{
$_SESSION[$key] = $value;
}
}
return;
}
$_SESSION[$data] = $value;
}
//--------------------------------------------------------------------
/**
* Get user data that has been set in the session.
*
* If the property exists as "normal", returns it.
* Otherwise, returns an array of any temp or flash data values with the
* property key.
*
* Replaces the legacy method $session->userdata();
*
* @param string $key Identifier of the session property to retrieve
* @return array|null The property value(s)
*/
public function get(string $key = null)
{
if (! empty($key) && (! is_null($value = isset($_SESSION[$key]) ? $_SESSION[$key] : null) || ! is_null($value = dot_array_search($key, $_SESSION ?? []))))
{
return $value;
}
elseif (empty($_SESSION))
{
return $key === null ? [] : null;
}
if (! empty($key))
{
return null;
}
$userdata = [];
$_exclude = array_merge(
['__ci_vars'], $this->getFlashKeys(), $this->getTempKeys()
);
$keys = array_keys($_SESSION);
foreach ($keys as $key)
{
if (! in_array($key, $_exclude, true))
{
$userdata[$key] = $_SESSION[$key];
}
}
return $userdata;
}
//--------------------------------------------------------------------
/**
* Returns whether an index exists in the session array.
*
* @param string $key Identifier of the session property we are interested in.
*
* @return boolean
*/
public function has(string $key): bool
{
return isset($_SESSION[$key]);
}
//--------------------------------------------------------------------
/**
* Push new value onto session value that is array.
*
* @param string $key Identifier of the session property we are interested in.
* @param array $data value to be pushed to existing session key.
*
* @return void
*/
public function push(string $key, array $data)
{
if ($this->has($key) && is_array($value = $this->get($key)))
{
$this->set($key, array_merge($value, $data));
}
}
//--------------------------------------------------------------------
/**
* Remove one or more session properties.
*
* If $key is an array, it is interpreted as an array of string property
* identifiers to remove. Otherwise, it is interpreted as the identifier
* of a specific session property to remove.
*
* @param string|array $key Identifier of the session property or properties to remove.
*/
public function remove($key)
{
if (is_array($key))
{
foreach ($key as $k)
{
unset($_SESSION[$k]);
}
return;
}
unset($_SESSION[$key]);
}
//--------------------------------------------------------------------
/**
* Magic method to set variables in the session by simply calling
* $session->foo = bar;
*
* @param string $key Identifier of the session property to set.
* @param string|array $value
*/
public function __set(string $key, $value)
{
$_SESSION[$key] = $value;
}
//--------------------------------------------------------------------
/**
* Magic method to get session variables by simply calling
* $foo = $session->foo;
*
* @param string $key Identifier of the session property to remove.
*
* @return null|string
*/
public function __get(string $key)
{
// Note: Keep this order the same, just in case somebody wants to
// use 'session_id' as a session data key, for whatever reason
if (isset($_SESSION[$key]))
{
return $_SESSION[$key];
}
elseif ($key === 'session_id')
{
return session_id();
}
return null;
}
//--------------------------------------------------------------------
/**
* Magic method to check for session variables.
* Different from has() in that it will validate 'session_id' as well.
* Mostly used by internal PHP functions, users should stick to has()
*
* @param string $key Identifier of the session property to remove.
*
* @return boolean
*/
public function __isset(string $key): bool
{
return isset($_SESSION[$key]) || ($key === 'session_id');
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
// Flash Data Methods
//--------------------------------------------------------------------
/**
* Sets data into the session that will only last for a single request.
* Perfect for use with single-use status update messages.
*
* If $data is an array, it is interpreted as an associative array of
* key/value pairs for flashdata properties.
* Otherwise, it is interpreted as the identifier of a specific
* flashdata property, with $value containing the property value.
*
* @param array|string $data Property identifier or associative array of properties
* @param string|array $value Property value if $data is a scalar
*/
public function setFlashdata($data, $value = null)
{
$this->set($data, $value);
$this->markAsFlashdata(is_array($data) ? array_keys($data) : $data);
}
//--------------------------------------------------------------------
/**
* Retrieve one or more items of flash data from the session.
*
* If the item key is null, return all flashdata.
*
* @param string $key Property identifier
* @return array|null The requested property value, or an associative array of them
*/
public function getFlashdata(string $key = null)
{
if (isset($key))
{
return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) &&
! is_int($_SESSION['__ci_vars'][$key])) ? $_SESSION[$key] : null;
}
$flashdata = [];
if (! empty($_SESSION['__ci_vars']))
{
foreach ($_SESSION['__ci_vars'] as $key => &$value)
{
is_int($value) || $flashdata[$key] = $_SESSION[$key];
}
}
return $flashdata;
}
//--------------------------------------------------------------------
/**
* Keeps a single piece of flash data alive for one more request.
*
* @param array|string $key Property identifier or array of them
*/
public function keepFlashdata($key)
{
$this->markAsFlashdata($key);
}
//--------------------------------------------------------------------
/**
* Mark a session property or properties as flashdata.
*
* @param array|string $key Property identifier or array of them
*
* @return boolean False if any of the properties are not already set
*/
public function markAsFlashdata($key): bool
{
if (is_array($key))
{
for ($i = 0, $c = count($key); $i < $c; $i ++)
{
if (! isset($_SESSION[$key[$i]]))
{
return false;
}
}
$new = array_fill_keys($key, 'new');
$_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars']) ? array_merge($_SESSION['__ci_vars'], $new) : $new;
return true;
}
if (! isset($_SESSION[$key]))
{
return false;
}
$_SESSION['__ci_vars'][$key] = 'new';
return true;
}
//--------------------------------------------------------------------
/**
* Unmark data in the session as flashdata.
*
* @param mixed $key Property identifier or array of them
*/
public function unmarkFlashdata($key)
{
if (empty($_SESSION['__ci_vars']))
{
return;
}
is_array($key) || $key = [$key];
foreach ($key as $k)
{
if (isset($_SESSION['__ci_vars'][$k]) && ! is_int($_SESSION['__ci_vars'][$k]))
{
unset($_SESSION['__ci_vars'][$k]);
}
}
if (empty($_SESSION['__ci_vars']))
{
unset($_SESSION['__ci_vars']);
}
}
//--------------------------------------------------------------------
/**
* Retrieve all of the keys for session data marked as flashdata.
*
* @return array The property names of all flashdata
*/
public function getFlashKeys(): array
{
if (! isset($_SESSION['__ci_vars']))
{
return [];
}
$keys = [];
foreach (array_keys($_SESSION['__ci_vars']) as $key)
{
is_int($_SESSION['__ci_vars'][$key]) || $keys[] = $key;
}
return $keys;
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
// Temp Data Methods
//--------------------------------------------------------------------
/**
* Sets new data into the session, and marks it as temporary data
* with a set lifespan.
*
* @param string|array $data Session data key or associative array of items
* @param null $value Value to store
* @param integer $ttl Time-to-live in seconds
*/
public function setTempdata($data, $value = null, int $ttl = 300)
{
$this->set($data, $value);
$this->markAsTempdata($data, $ttl);
}
//--------------------------------------------------------------------
/**
* Returns either a single piece of tempdata, or all temp data currently
* in the session.
*
* @param string $key Session data key
* @return mixed Session data value or null if not found.
*/
public function getTempdata(string $key = null)
{
if (isset($key))
{
return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) &&
is_int($_SESSION['__ci_vars'][$key])) ? $_SESSION[$key] : null;
}
$tempdata = [];
if (! empty($_SESSION['__ci_vars']))
{
foreach ($_SESSION['__ci_vars'] as $key => &$value)
{
is_int($value) && $tempdata[$key] = $_SESSION[$key];
}
}
return $tempdata;
}
//--------------------------------------------------------------------
/**
* Removes a single piece of temporary data from the session.
*
* @param string $key Session data key
*/
public function removeTempdata(string $key)
{
$this->unmarkTempdata($key);
unset($_SESSION[$key]);
}
//--------------------------------------------------------------------
/**
* Mark one of more pieces of data as being temporary, meaning that
* it has a set lifespan within the session.
*
* @param string|array $key Property identifier or array of them
* @param integer $ttl Time to live, in seconds
*
* @return boolean False if any of the properties were not set
*/
public function markAsTempdata($key, int $ttl = 300): bool
{
$ttl += time();
if (is_array($key))
{
$temp = [];
foreach ($key as $k => $v)
{
// Do we have a key => ttl pair, or just a key?
if (is_int($k))
{
$k = $v;
$v = $ttl;
}
elseif (is_string($v))
{
$v = time() + $ttl;
}
else
{
$v += time();
}
if (! array_key_exists($k, $_SESSION))
{
return false;
}
$temp[$k] = $v;
}
$_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars']) ? array_merge($_SESSION['__ci_vars'], $temp) : $temp;
return true;
}
if (! isset($_SESSION[$key]))
{
return false;
}
$_SESSION['__ci_vars'][$key] = $ttl;
return true;
}
//--------------------------------------------------------------------
/**
* Unmarks temporary data in the session, effectively removing its
* lifespan and allowing it to live as long as the session does.
*
* @param string|array $key Property identifier or array of them
*/
public function unmarkTempdata($key)
{
if (empty($_SESSION['__ci_vars']))
{
return;
}
is_array($key) || $key = [$key];
foreach ($key as $k)
{
if (isset($_SESSION['__ci_vars'][$k]) && is_int($_SESSION['__ci_vars'][$k]))
{
unset($_SESSION['__ci_vars'][$k]);
}
}
if (empty($_SESSION['__ci_vars']))
{
unset($_SESSION['__ci_vars']);
}
}
//--------------------------------------------------------------------
/**
* Retrieve the keys of all session data that have been marked as temporary data.
*
* @return array
*/
public function getTempKeys(): array
{
if (! isset($_SESSION['__ci_vars']))
{
return [];
}
$keys = [];
foreach (array_keys($_SESSION['__ci_vars']) as $key)
{
is_int($_SESSION['__ci_vars'][$key]) && $keys[] = $key;
}
return $keys;
}
//--------------------------------------------------------------------
/**
* Sets the driver as the session handler in PHP.
* Extracted for easier testing.
*/
protected function setSaveHandler()
{
session_set_save_handler($this->driver, true);
}
//--------------------------------------------------------------------
/**
* Starts the session.
* Extracted for testing reasons.
*/
protected function startSession()
{
if (ENVIRONMENT === 'testing')
{
$_SESSION = [];
return;
}
// @codeCoverageIgnoreStart
session_start();
// @codeCoverageIgnoreEnd
}
//--------------------------------------------------------------------
/**
* Takes care of setting the cookie on the client side.
* Extracted for testing reasons.
*/
protected function setCookie()
{
setcookie(
$this->sessionCookieName, session_id(), (empty($this->sessionExpiration) ? 0 : time() + $this->sessionExpiration), $this->cookiePath, $this->cookieDomain, $this->cookieSecure, true
);
}
//--------------------------------------------------------------------
}
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