zoneminder/web/includes/session.php

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<?php
// ZM session start function support timestamp management
function zm_session_start() {
// Make sure use_strict_mode is enabled.
// use_strict_mode is mandatory for security reasons.
ini_set('session.use_strict_mode', 1);
$currentCookieParams = session_get_cookie_params();
$currentCookieParams['lifetime'] = ZM_COOKIE_LIFETIME;
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$currentCookieParams['httponly'] = true;
$currentCookieParams['samesite'] = 'Strict';
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session_set_cookie_params( $currentCookieParams);
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ini_set('session.name', 'ZMSESSID');
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ZM\Logger::Debug('Setting cookie parameters to '.print_r($currentCookieParams, true));
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session_start();
$_SESSION['remoteAddr'] = $_SERVER['REMOTE_ADDR']; // To help prevent session hijacking
$now = time();
// Do not allow to use expired session ID
if ( !empty($_SESSION['last_time']) && ($_SESSION['last_time'] < ($now - 180)) ) {
ZM\Info('Destroying session due to timeout. ');
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session_destroy();
session_start();
} else if ( !empty($_SESSION['generated_at']) ) {
if ( $_SESSION['generated_at']<($now-(ZM_COOKIE_LIFETIME/2)) ) {
ZM\Logger::Debug("Regenerating session because generated_at " . $_SESSION['generated_at'] . ' < ' . $now . '-'.ZM_COOKIE_LIFETIME.'/2 = '.($now-ZM_COOKIE_LIFETIME/2));
zm_session_regenerate_id();
}
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}
} // function zm_session_start()
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// session regenerate id function
// Assumes that zm_session_start has been called previously
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function zm_session_regenerate_id() {
if ( session_status() != PHP_SESSION_ACTIVE ) {
session_start();
}
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// Set deleted timestamp. Session data must not be deleted immediately for reasons.
$_SESSION['last_time'] = time();
// Finish session
session_write_close();
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session_start();
session_regenerate_id();
unset($_SESSION['last_time']);
$_SESSION['generated_at'] = time();
} // function zm_session_regenerate_id()
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function is_session_started() {
if ( php_sapi_name() !== 'cli' ) {
if ( version_compare(phpversion(), '5.4.0', '>=') ) {
return session_status() === PHP_SESSION_ACTIVE ? TRUE : FALSE;
} else {
return session_id() === '' ? FALSE : TRUE;
}
} else {
Warning("php_sapi_name === 'cli'");
}
return FALSE;
} // function is_session_started()
function zm_session_clear() {
session_start();
$_SESSION = array();
if ( ini_get('session.use_cookies') ) {
$p = session_get_cookie_params();
# Update the cookie to expire in the past.
setcookie(session_name(), '', time() - 31536000, $p['path'], $p['domain'], $p['secure'], $p['httponly']);
}
session_unset();
session_destroy();
session_write_close();
session_start();
} // function zm_session_clear()
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?>