class.ilHTTPS.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilHTTPS
{
        const PROTOCOL_HTTP  = 1;
        const PROTOCOL_HTTPS = 2;
        
        private static $instance = null;

        protected $enabled = false;

        protected $protected_classes = array();
        protected $protected_scripts = array();

        protected $automaticHTTPSDetectionEnabled = false;
        protected $headerName = false;
        protected $headerValue = false;

        function __construct()
        {
                global $ilSetting, $ilIliasIniFile;

                if($this->enabled = (bool)$ilSetting->get('https'))
                {
                        $this->__readProtectedScripts();
                        $this->__readProtectedClasses();
                }

                if ($this->automaticHTTPSDetectionEnabled = (bool)$ilIliasIniFile->readVariable('https', "auto_https_detect_enabled"))
                {
                    $this->headerName = $ilIliasIniFile->readVariable('https', "auto_https_detect_header_name");
                    $this->headerValue = $ilIliasIniFile->readVariable('https', "auto_https_detect_header_value");
                }
        }
        
        public static function getInstance()
        {
                if(self::$instance)
                {
                        return self::$instance;
                }
                return self::$instance = new ilHTTPS();
        }

        protected function shouldSwitchProtocol($to_protocol)
        {
                switch($to_protocol)
                {
                        case self::PROTOCOL_HTTP:
                                $should_switch_to_http = (
                                        !in_array(basename($_SERVER['SCRIPT_NAME']), $this->protected_scripts) &&
                                        !in_array(strtolower($_GET['cmdClass']), $this->protected_classes)
                                ) && $_SERVER['HTTPS'] == 'on';

                                return $should_switch_to_http;
                                break;

                        case self::PROTOCOL_HTTPS:
                                $should_switch_to_https = (
                                        in_array(basename($_SERVER['SCRIPT_NAME']), $this->protected_scripts) ||
                                        in_array(strtolower($_GET['cmdClass']), $this->protected_classes)
                                ) && $_SERVER['HTTPS'] != 'on';

                                return $should_switch_to_https;
                                break;
                }

                return false;
        }

        function checkPort()
        {
                // if https is enabled for scripts or classes, check for redirection
            if ($this->enabled)
                {
                if($this->shouldSwitchProtocol(self::PROTOCOL_HTTPS))
                {
                        header("location: https://".$_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"]);
                        exit;
                }
                if($this->shouldSwitchProtocol(self::PROTOCOL_HTTP))
                {
                        header("location: http://".$_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"]);
                        exit;
                }
                }
                return true;
        }

        function __readProtectedScripts()
        {
                $this->protected_scripts[] = 'login.php';
                $this->protected_scripts[] = 'index.php';
                $this->protected_scripts[] = 'register.php';
                // BEGIN WebDAV Use SSL for WebDAV.
                $this->protected_scripts[] = 'webdav.php';
                // END WebDAV Use SSL for WebDAV.
                $this->protected_scripts[] = 'shib_login.php';
                
                return true;
        }

        public function isDetected () 
        {
                if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on")
                   return true;

            if ($this->automaticHTTPSDetectionEnabled)
                {
                    $headerName = "HTTP_".str_replace("-","_", strtoupper($this->headerName));
                   /* echo $headerName;
                    echo $_SERVER[$headerName];*/
                    if (strcasecmp($_SERVER[$headerName],$this->headerValue)==0) 
                    {
                        $_SERVER["HTTPS"] = "on";
                        return true;
                    }
                    /*
                    if(isset($_SERVER[$this->headerName]) && (strcasecmp($_SERVER[$this->headerName],$this->headerValue) == 0))
                    {
                        $_SERVER['HTTPS'] = 'on';
                        return true;
                    }
                    */
                }

        return false;
        }

        function __readProtectedClasses()
        {
                $this->protected_classes[] = 'ilstartupgui';
                $this->protected_classes[] = 'ilaccountregistrationgui';
                $this->protected_classes[] = 'ilpersonalsettingsgui';
        }

        public static function _checkHTTPS()
        {
                // only check standard port in the moment
                $port = 443;

                if(($sp = fsockopen($_SERVER["SERVER_NAME"],$port,$errno,$error)) === false)
                {
                        return false;
                }
                fclose($sp);
                return true;
        }
        function _checkHTTP()
        {
                $port = 80;

                if(($sp = fsockopen($_SERVER["SERVER_NAME"],$port,$errno,$error)) === false)
                {
                        return false;
                }
                fclose($sp);
                return true;
        }
        
        public function enableSecureCookies()
        {
                global $ilLog,$ilClientIniFile;

                $secure_disabled = $ilClientIniFile->readVariable('session','disable_secure_cookies');
                if(!$secure_disabled and !$this->enabled and $this->isDetected() and !session_id())
                {
                        #$ilLog->write(__CLASS__.': Enabled secure cookies');
                        session_set_cookie_params(
                                IL_COOKIE_EXPIRE, IL_COOKIE_PATH, IL_COOKIE_DOMAIN, true, IL_COOKIE_HTTPONLY
                        );
                }
                return true;
        }
}
?>