310 lines
8.0 KiB
PHP
310 lines
8.0 KiB
PHP
<?php
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namespace Shaarli\Security;
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use Shaarli\Config\ConfigManager;
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/**
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* Manages the server-side session
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*/
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class SessionManager
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{
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public const KEY_LINKS_PER_PAGE = 'LINKS_PER_PAGE';
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public const KEY_VISIBILITY = 'visibility';
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public const KEY_UNTAGGED_ONLY = 'untaggedonly';
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public const KEY_SUCCESS_MESSAGES = 'successes';
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public const KEY_WARNING_MESSAGES = 'warnings';
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public const KEY_ERROR_MESSAGES = 'errors';
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/** @var int Session expiration timeout, in seconds */
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public static $SHORT_TIMEOUT = 3600; // 1 hour
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/** @var int Session expiration timeout, in seconds */
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public static $LONG_TIMEOUT = 31536000; // 1 year
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/** @var array Local reference to the global $_SESSION array */
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protected $session = [];
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/** @var ConfigManager Configuration Manager instance **/
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protected $conf = null;
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/** @var bool Whether the user should stay signed in (LONG_TIMEOUT) */
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protected $staySignedIn = false;
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/** @var string */
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protected $savePath;
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/**
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* Constructor
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*
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* @param array $session The $_SESSION array (reference)
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* @param ConfigManager $conf ConfigManager instance
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* @param string $savePath Session save path returned by builtin function session_save_path()
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*/
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public function __construct(&$session, $conf, string $savePath)
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{
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$this->session = &$session;
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$this->conf = $conf;
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$this->savePath = $savePath;
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}
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/**
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* Initialize XSRF token and links per page session variables.
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*/
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public function initialize(): void
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{
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if (!isset($this->session['tokens'])) {
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$this->session['tokens'] = [];
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}
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if (!isset($this->session['LINKS_PER_PAGE'])) {
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$this->session['LINKS_PER_PAGE'] = $this->conf->get('general.links_per_page', 20);
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}
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}
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/**
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* Define whether the user should stay signed in across browser sessions
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*
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* @param bool $staySignedIn Keep the user signed in
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*/
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public function setStaySignedIn($staySignedIn)
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{
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$this->staySignedIn = $staySignedIn;
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}
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/**
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* Generates a session token
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*
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* @return string token
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*/
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public function generateToken()
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{
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$token = sha1(uniqid('', true) . '_' . mt_rand() . $this->conf->get('credentials.salt'));
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$this->session['tokens'][$token] = 1;
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return $token;
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}
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/**
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* Checks the validity of a session token, and destroys it afterwards
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*
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* @param string $token The token to check
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*
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* @return bool true if the token is valid, else false
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*/
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public function checkToken($token)
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{
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if (! isset($this->session['tokens'][$token])) {
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// the token is wrong, or has already been used
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return false;
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}
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// destroy the token to prevent future use
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unset($this->session['tokens'][$token]);
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return true;
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}
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/**
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* Validate session ID to prevent Full Path Disclosure.
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*
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* See #298.
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* The session ID's format depends on the hash algorithm set in PHP settings
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*
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* @param string $sessionId Session ID
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*
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* @return true if valid, false otherwise.
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*
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* @see http://php.net/manual/en/function.hash-algos.php
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* @see http://php.net/manual/en/session.configuration.php
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*/
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public static function checkId($sessionId)
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{
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if (empty($sessionId)) {
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return false;
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}
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if (!$sessionId) {
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return false;
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}
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if (!preg_match('/^[a-zA-Z0-9,-]{2,128}$/', $sessionId)) {
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return false;
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}
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return true;
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}
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/**
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* Store user login information after a successful login
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*
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* @param string $clientIpId Client IP address identifier
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*/
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public function storeLoginInfo($clientIpId)
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{
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$this->session['ip'] = $clientIpId;
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$this->session['username'] = $this->conf->get('credentials.login');
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$this->extendTimeValidityBy(self::$SHORT_TIMEOUT);
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}
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/**
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* Extend session validity
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*/
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public function extendSession()
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{
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if ($this->staySignedIn) {
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return $this->extendTimeValidityBy(self::$LONG_TIMEOUT);
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}
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return $this->extendTimeValidityBy(self::$SHORT_TIMEOUT);
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}
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/**
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* Extend expiration time
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*
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* @param int $duration Expiration time extension (seconds)
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*
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* @return int New session expiration time
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*/
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protected function extendTimeValidityBy($duration)
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{
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$expirationTime = time() + $duration;
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$this->session['expires_on'] = $expirationTime;
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return $expirationTime;
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}
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/**
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* Logout a user by unsetting all login information
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*
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* See:
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* - https://secure.php.net/manual/en/function.setcookie.php
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*/
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public function logout()
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{
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if (isset($this->session)) {
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unset($this->session['ip']);
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unset($this->session['expires_on']);
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unset($this->session['username']);
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unset($this->session['visibility']);
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}
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}
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/**
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* Check whether the session has expired
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*
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* @param string $clientIpId Client IP address identifier
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*
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* @return bool true if the session has expired, false otherwise
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*/
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public function hasSessionExpired()
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{
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if (empty($this->session['expires_on'])) {
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return true;
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}
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if (time() >= $this->session['expires_on']) {
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return true;
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}
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return false;
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}
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/**
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* Check whether the client IP address has changed
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*
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* @param string $clientIpId Client IP address identifier
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*
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* @return bool true if the IP has changed, false if it has not, or
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* if session protection has been disabled
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*/
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public function hasClientIpChanged($clientIpId)
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{
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if ($this->conf->get('security.session_protection_disabled') === true) {
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return false;
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}
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if (isset($this->session['ip']) && $this->session['ip'] === $clientIpId) {
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return false;
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}
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return true;
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}
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/** @return array Local reference to the global $_SESSION array */
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public function getSession(): array
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{
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return $this->session;
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}
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/**
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* @param mixed $default value which will be returned if the $key is undefined
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*
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* @return mixed Content stored in session
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*/
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public function getSessionParameter(string $key, $default = null)
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{
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return $this->session[$key] ?? $default;
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}
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/**
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* Store a variable in user session.
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*
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* @param string $key Session key
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* @param mixed $value Session value to store
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*
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* @return $this
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*/
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public function setSessionParameter(string $key, $value): self
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{
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$this->session[$key] = $value;
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return $this;
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}
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/**
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* Delete a variable in user session.
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*
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* @param string $key Session key
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*
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* @return $this
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*/
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public function deleteSessionParameter(string $key): self
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{
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unset($this->session[$key]);
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return $this;
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}
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public function getSavePath(): string
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{
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return $this->savePath;
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}
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/*
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* Next public functions wrapping native PHP session API.
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*/
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public function destroy(): bool
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{
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$this->session = [];
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return session_destroy();
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}
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public function start(): bool
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{
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if (session_status() === PHP_SESSION_ACTIVE) {
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$this->destroy();
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}
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return session_start();
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}
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/**
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* Be careful, return type of session_set_cookie_params() changed between PHP 7.1 and 7.2.
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*/
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public function cookieParameters(int $lifeTime, string $path, string $domain): void
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{
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session_set_cookie_params($lifeTime, $path, $domain);
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}
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public function regenerateId(bool $deleteOldSession = false): bool
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{
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return session_regenerate_id($deleteOldSession);
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}
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}
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