class.ilAuthUtils.php

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<?php

/* Copyright (c) 1998-2010 ILIAS open source, Extended GPL, see docs/LICENSE */


// define auth modes
define("AUTH_LOCAL", 1);
define("AUTH_LDAP", 2);
define("AUTH_RADIUS", 3);
define("AUTH_SCRIPT", 4);
define("AUTH_SHIBBOLETH", 5);
define("AUTH_CAS", 6);
define("AUTH_SOAP", 7);
// BEGIN WebDAV: Add support for HTTP authentication
define("AUTH_HTTP", 8);
// END WebDAV: Add support for HTTP authentication
define("AUTH_ECS", 9);

define("AUTH_APACHE", 11);
define("AUTH_SAML", 12);

define("AUTH_INACTIVE", 18);

define('AUTH_MULTIPLE', 20);

define('AUTH_SESSION', 21);

define('AUTH_PROVIDER_LTI', 22);

define('AUTH_SOAP_NO_ILIAS_USER', -100);
define('AUTH_LDAP_NO_ILIAS_USER', -200);
define('AUTH_RADIUS_NO_ILIAS_USER', -300);

// apache auhtentication failed...
// maybe no (valid) certificate or
// username could not be extracted
define('AUTH_APACHE_FAILED', -500);
define('AUTH_SAML_FAILED', -501);

define('AUTH_MODE_INACTIVE', -1000);

// an external user cannot be found in ilias, but his email address
// matches one or more ILIAS users
define('AUTH_SOAP_NO_ILIAS_USER_BUT_EMAIL', -101);
define('AUTH_CAS_NO_ILIAS_USER', -90);

// ilUser validation (no login)
define('AUTH_USER_WRONG_IP', -600);
define('AUTH_USER_INACTIVE', -601);
define('AUTH_USER_TIME_LIMIT_EXCEEDED', -602);
define('AUTH_USER_SIMULTANEOUS_LOGIN', -603);
define('AUTH_CAPTCHA_INVALID', -604);


include_once './Services/Authentication/classes/class.ilAuthFactory.php';
require_once('Services/Authentication/classes/class.ilSessionControl.php');


class ilAuthUtils
{
    const LOCAL_PWV_FULL = 1;
    const LOCAL_PWV_NO = 2;
    const LOCAL_PWV_USER = 3;
    
    
    public static function initSession()
    {
    }
    
    public static function isAuthenticationForced()
    {
        if (isset($_GET['ecs_hash']) or isset($_GET['ecs_hash_url'])) {
            return true;
        }
        return false;
    }
    
    public static function handleForcedAuthentication()
    {
        if (isset($_GET['ecs_hash']) or isset($_GET['ecs_hash_url'])) {
            include_once './Services/Authentication/classes/Frontend/class.ilAuthFrontendCredentials.php';
            $credentials = new ilAuthFrontendCredentials();
            $credentials->setUsername($_GET['ecs_login']);
            $credentials->setAuthMode(AUTH_ECS);
            
            include_once './Services/Authentication/classes/Provider/class.ilAuthProviderFactory.php';
            $provider_factory = new ilAuthProviderFactory();
            $providers = $provider_factory->getProviders($credentials);
            
            include_once './Services/Authentication/classes/class.ilAuthStatus.php';
            $status = ilAuthStatus::getInstance();
            
            include_once './Services/Authentication/classes/Frontend/class.ilAuthFrontendFactory.php';
            $frontend_factory = new ilAuthFrontendFactory();
            $frontend_factory->setContext(ilAuthFrontendFactory::CONTEXT_STANDARD_FORM);
            $frontend = $frontend_factory->getFrontend(
                $GLOBALS['DIC']['ilAuthSession'],
                $status,
                $credentials,
                $providers
            );
            
            $frontend->authenticate();
            
            switch ($status->getStatus()) {
                case ilAuthStatus::STATUS_AUTHENTICATED:
                    return;
                    
                case ilAuthStatus::STATUS_AUTHENTICATION_FAILED:
                    ilInitialisation::goToPublicSection();
                    return;
            }
        }
    }
    

    
    public static function _getAuthModeOfUser($a_username, $a_password, $a_db_handler = '')
    {
        global $ilDB;
        
        if (isset($_GET['ecs_hash']) or isset($_GET['ecs_hash_url'])) {
            ilAuthFactory::setContext(ilAuthFactory::CONTEXT_ECS);
            return AUTH_ECS;
        }
        if (isset($_POST['auth_mode'])) {
            // begin-patch ldap_multiple
            return $_POST['auth_mode'];
            // end-patch ldap_multiple
        }

        include_once('./Services/Authentication/classes/class.ilAuthModeDetermination.php');
        $det = ilAuthModeDetermination::_getInstance();
        
        if (!$det->isManualSelection() and $det->getCountActiveAuthModes() > 1) {
            ilLoggerFactory::getLogger('auth')->debug('Using AUTH_MULTIPLE');
            return AUTH_MULTIPLE;
        }


        $db =&$ilDB;
        
        if ($a_db_handler != '') {
            $db =&$a_db_handler;
        }
        
        // Is it really necessary to check the auth mode with password ?
        // Changed: smeyer
        $q = "SELECT auth_mode FROM usr_data WHERE " .
             "login = " . $ilDB->quote($a_username);
        //"passwd = ".$ilDB->quote(md5($a_password))."";
                             
             
        $r = $db->query($q);
        $row = $r->fetchRow(ilDBConstants::FETCHMODE_OBJECT);
        //echo "+".$row->auth_mode."+";

        
        $auth_mode =  self::_getAuthMode($row->auth_mode, $db);
        
        return in_array($auth_mode, self::_getActiveAuthModes()) ? $auth_mode : AUTH_INACTIVE;
    }
    
    public static function _getAuthMode($a_auth_mode, $a_db_handler = '')
    {
        global $ilDB, $ilSetting;

        $db =&$ilDB;
        
        if ($a_db_handler != '') {
            $db =&$a_db_handler;
        }

        // begin-patch ldap_multiple
        if (strpos($a_auth_mode, '_') !== false) {
            $auth_arr = explode('_', $a_auth_mode);
            $auth_switch = $auth_arr[0];
        } else {
            $auth_switch = $a_auth_mode;
        }
        switch ($auth_switch) {
            case "local":
                return AUTH_LOCAL;
                break;
                
            case "ldap":
                // begin-patch ldap_multiple
                include_once './Services/LDAP/classes/class.ilLDAPServer.php';
                return ilLDAPServer::getKeyByAuthMode($a_auth_mode);
                // end-patch ldap_multiple
                
            case 'lti':
                include_once './Services/LTI/classes/InternalProvider/class.ilAuthProviderLTI.php';
                return ilAuthProviderLTI::getKeyByAuthMode($a_auth_mode);
                
            case "radius":
                return AUTH_RADIUS;
                break;
                
            case "script":
                return AUTH_SCRIPT;
                break;
                
            case "shibboleth":
                return AUTH_SHIBBOLETH;
                break;

            case 'saml':
                require_once 'Services/Saml/classes/class.ilSamlIdp.php';
                return ilSamlIdp::getKeyByAuthMode($a_auth_mode);

            case "cas":
                return AUTH_CAS;
                break;

            case "soap":
                return AUTH_SOAP;
                break;
                
            case 'ecs':
                return AUTH_ECS;

            case 'apache':
                return AUTH_APACHE;

            default:
                return $ilSetting->get("auth_mode");
                break;
        }
    }
    
    public static function _getAuthModeName($a_auth_key)
    {
        global $ilias;

        // begin-patch ldap_multiple
        switch ((int) $a_auth_key) {
            case AUTH_LOCAL:
                return "local";
                break;
                
            case AUTH_LDAP:
                // begin-patch ldap_multiple
                include_once './Services/LDAP/classes/class.ilLDAPServer.php';
                return ilLDAPServer::getAuthModeByKey($a_auth_key);
                // end-patch ldap_multiple
                
            case AUTH_PROVIDER_LTI:
                include_once './Services/LTI/classes/InternalProvider/class.ilAuthProviderLTI.php';
                return ilAuthProviderLTI::getAuthModeByKey($a_auth_key);
                
            case AUTH_RADIUS:
                return "radius";
                break;

            case AUTH_CAS:
                return "cas";
                break;

            case AUTH_SCRIPT:
                return "script";
                break;
                
            case AUTH_SHIBBOLETH:
                return "shibboleth";
                break;

            case AUTH_SAML:
                require_once 'Services/Saml/classes/class.ilSamlIdp.php';
                return ilSamlIdp::getAuthModeByKey($a_auth_key);

            case AUTH_SOAP:
                return "soap";
                break;
                
            case AUTH_ECS:
                return 'ecs';

            case AUTH_APACHE:
                return 'apache';

            case AUTH_PROVIDER_LTI:
                return "lti";
                break;

            default:
                return "default";
                break;
        }
    }
    
    public static function _getActiveAuthModes()
    {
        global $ilias,$ilSetting;
        
        $modes = array(
                        'default'       => $ilSetting->get("auth_mode"),
                        'local'         => AUTH_LOCAL
                        );
        include_once('Services/LDAP/classes/class.ilLDAPServer.php');
        // begin-patch ldap_multiple
        foreach (ilLDAPServer::_getActiveServerList() as $sid) {
            $modes['ldap_' . $sid] = (AUTH_LDAP . '_' . $sid);
        }
        
        include_once './Services/LTI/classes/InternalProvider/class.ilAuthProviderLTI.php';
        foreach (ilAuthProviderLTI::getAuthModes() as $sid) {
            $modes['lti_' . $sid] = (AUTH_PROVIDER_LTI . '_' . $sid);
        }
        
        // end-patch ldap_multiple
        if ($ilSetting->get("radius_active")) {
            $modes['radius'] = AUTH_RADIUS;
        }
        if ($ilSetting->get("shib_active")) {
            $modes['shibboleth'] = AUTH_SHIBBOLETH;
        }
        if ($ilSetting->get("script_active")) {
            $modes['script'] = AUTH_SCRIPT;
        }
        if ($ilSetting->get("cas_active")) {
            $modes['cas'] = AUTH_CAS;
        }
        if ($ilSetting->get("soap_auth_active")) {
            $modes['soap'] = AUTH_SOAP;
        }
        if ($ilSetting->get("apache_active")) {
            $modes['apache'] = AUTH_APACHE;
        }
                
        include_once './Services/WebServices/ECS/classes/class.ilECSServerSettings.php';
        if (ilECSServerSettings::getInstance()->activeServerExists()) {
            $modes['ecs'] = AUTH_ECS;
        }

        require_once 'Services/Saml/classes/class.ilSamlIdp.php';
        foreach (ilSamlIdp::getActiveIdpList() as $idp) {
            $modes['saml_' . $idp->getIdpId()] = AUTH_SAML . '_' . $idp->getIdpId();
        }

        // begin-path auth_plugin
        foreach (self::getAuthPlugins() as $pl) {
            foreach ($pl->getAuthIds() as $auth_id) {
                if ($pl->isAuthActive($auth_id)) {
                    $modes[$pl->getAuthName($auth_id)] = $auth_id;
                }
            }
        }
        // end-path auth_plugin
        return $modes;
    }
    
    public static function _getAllAuthModes()
    {
        $modes = array(
            AUTH_LOCAL,
            AUTH_LDAP,
            AUTH_SHIBBOLETH,
            AUTH_SAML,
            AUTH_CAS,
            AUTH_SOAP,
            AUTH_RADIUS,
            AUTH_ECS,
            AUTH_PROVIDER_LTI,
            AUTH_APACHE
        );
        $ret = array();
        foreach ($modes as $mode) {
            if ($mode == AUTH_PROVIDER_LTI) {
                include_once './Services/LTI/classes/InternalProvider/class.ilAuthProviderLTI.php';
                foreach (ilAuthProviderLTI::getAuthModes() as $sid) {
                    $id = AUTH_PROVIDER_LTI . '_' . $sid;
                    $ret[$id] = ilAuthUtils::_getAuthModeName($id);
                }
                continue;
            }

            // multi ldap implementation
            if ($mode == AUTH_LDAP) {
                foreach (ilLDAPServer::_getServerList() as $ldap_id) {
                    $id = AUTH_LDAP . '_' . $ldap_id;
                    $ret[$id] = ilAuthUtils::_getAuthModeName($id);
                }
                continue;
            } elseif ($mode == AUTH_SAML) {
                require_once 'Services/Saml/classes/class.ilSamlIdp.php';
                foreach (ilSamlIdp::getAllIdps() as $idp) {
                    $id = AUTH_SAML . '_' . $idp->getIdpId();
                    $ret[$id] = ilAuthUtils::_getAuthModeName($id);
                }
                continue;
            }
            $ret[$mode] =  ilAuthUtils::_getAuthModeName($mode);
        }
        return $ret;
    }
    
    public static function _generateLogin($a_login)
    {
        global $ilDB;
        
        // Check if username already exists
        $found = false;
        $postfix = 0;
        $c_login = $a_login;
        while (!$found) {
            $r = $ilDB->query("SELECT login FROM usr_data WHERE login = " .
                $ilDB->quote($c_login));
            if ($r->numRows() > 0) {
                $postfix++;
                $c_login = $a_login . $postfix;
            } else {
                $found = true;
            }
        }
        
        return $c_login;
    }
    
    public static function _hasMultipleAuthenticationMethods()
    {
        include_once('Services/Radius/classes/class.ilRadiusSettings.php');
        
        $rad_settings = ilRadiusSettings::_getInstance();
        if ($rad_settings->isActive()) {
            return true;
        }
        include_once('Services/LDAP/classes/class.ilLDAPServer.php');

        if (count(ilLDAPServer::_getActiveServerList())) {
            return true;
        }

        global $ilSetting;

        if ($ilSetting->get('apache_active')) {
            return true;
        }
        
        // begin-patch auth_plugin
        foreach (ilAuthUtils::getAuthPlugins() as $pl) {
            foreach ($pl->getAuthIds() as $auth_id) {
                if ($pl->getMultipleAuthModeOptions($auth_id)) {
                    return true;
                }
            }
        }
        // end-patch auth_plugin
        
        
        return false;
    }
    
    public static function _getMultipleAuthModeOptions($lng)
    {
        global $ilSetting;
        
        // in the moment only ldap is activated as additional authentication method
        include_once('Services/LDAP/classes/class.ilLDAPServer.php');
        
        $options[AUTH_LOCAL]['txt'] = $lng->txt('authenticate_ilias');

        
        // begin-patch ldap_multiple
        foreach (ilLDAPServer::_getActiveServerList() as $sid) {
            $server = ilLDAPServer::getInstanceByServerId($sid);
            $options[AUTH_LDAP . '_' . $sid]['txt'] = $server->getName();
        }
        // end-patch ldap_multiple
        
        include_once('Services/Radius/classes/class.ilRadiusSettings.php');
        $rad_settings = ilRadiusSettings::_getInstance();
        if ($rad_settings->isActive()) {
            $options[AUTH_RADIUS]['txt'] = $rad_settings->getName();
        }

        if ($ilSetting->get('apache_active')) {
            global $lng;
            $apache_settings = new ilSetting('apache_auth');
            $options[AUTH_APACHE]['txt'] = $apache_settings->get('name', $lng->txt('apache_auth'));
            $options[AUTH_APACHE]['hide_in_ui'] = true;
        }

        if ($ilSetting->get('auth_mode', AUTH_LOCAL) == AUTH_LDAP) {
            $default = AUTH_LDAP;
        } elseif ($ilSetting->get('auth_mode', AUTH_LOCAL) == AUTH_RADIUS) {
            $default = AUTH_RADIUS;
        } else {
            $default = AUTH_LOCAL;
        }
        
        $default = $ilSetting->get('default_auth_mode', $default);
        $default = (int) $_REQUEST['auth_mode'] ? (int) $_REQUEST['auth_mode'] : $default;
        
        
        // begin-patch auth_plugin
        $pls = ilAuthUtils::getAuthPlugins();
        foreach ($pls as $pl) {
            $auths = $pl->getAuthIds();
            foreach ($auths as $auth_id) {
                $pl_auth_option = $pl->getMultipleAuthModeOptions($auth_id);
                if ($pl_auth_option) {
                    $options = $options + $pl_auth_option;
                }
            }
        }
        // end-patch auth_plugins

        if (array_key_exists($default, $options)) {
            $options[$default]['checked'] = true;
        }

        return $options ? $options : array();
    }

    public static function _isExternalAccountEnabled()
    {
        global $ilSetting;
        
        if ($ilSetting->get("cas_active")) {
            return true;
        }
        if ($ilSetting->get("soap_auth_active")) {
            return true;
        }
        if ($ilSetting->get("shib_active")) {
            return true;
        }
        if ($ilSetting->get('radius_active')) {
            return true;
        }
        include_once('Services/LDAP/classes/class.ilLDAPServer.php');
        if (count(ilLDAPServer::_getActiveServerList())) {
            return true;
        }
        
        include_once './Services/LTI/classes/InternalProvider/class.ilAuthProviderLTI.php';
        if (count(ilAuthProviderLTI::getActiveAuthModes())) {
            return true;
        }
        
        require_once 'Services/Saml/classes/class.ilSamlIdp.php';
        if (count(ilSamlIdp::getActiveIdpList()) > 0) {
            return true;
        }

        // begin-path auth_plugin
        foreach (self::getAuthPlugins() as $pl) {
            foreach ($pl->getAuthIds() as $auth_id) {
                if ($pl->isAuthActive($auth_id) and $pl->isExternalAccountNameRequired($auth_id)) {
                    return true;
                }
            }
        }
        // end-path auth_plugin
        
        return false;
    }
    
    public static function _allowPasswordModificationByAuthMode($a_auth_mode)
    {
        // begin-patch ldap_multiple
        // cast to int
        switch ((int) $a_auth_mode) {
            case AUTH_LDAP:
            case AUTH_RADIUS:
            case AUTH_ECS:
            case AUTH_PROVIDER_LTI:
                return false;
            default:
                return true;
        }
    }
    
    public static function _needsExternalAccountByAuthMode($a_auth_mode)
    {
        switch ($a_auth_mode) {
            case AUTH_LOCAL:
            case AUTH_APACHE:
                return false;
            default:
                return true;
        }
    }

    public static function isPasswordModificationHidden()
    {
        global $ilSetting;

        if ($ilSetting->get('usr_settings_hide_password') || $ilSetting->get('usr_settings_disable_password')) {
            return true;
        }

        return false;
    }
    
    public static function isLocalPasswordEnabledForAuthMode($a_authmode)
    {
        global $ilSetting;

        switch ((int) $a_authmode) {
            // always enabled
            case AUTH_LOCAL:
            case AUTH_APACHE:
                return true;

            // No local passwords for these auth modes
            case AUTH_LDAP:
            case AUTH_RADIUS:
            case AUTH_ECS:
            case AUTH_SCRIPT:
            case AUTH_PROVIDER_LTI:
                return false;

            case AUTH_SAML:
                require_once 'Services/Saml/classes/class.ilSamlIdp.php';
                $idp = ilSamlIdp::getInstanceByIdpId(ilSamlIdp::getIdpIdByAuthMode($a_authmode));
                return $idp->isActive() && $idp->allowLocalAuthentication();

            case AUTH_SHIBBOLETH:
                return $ilSetting->get("shib_auth_allow_local");
            case AUTH_SOAP:
                return $ilSetting->get("soap_auth_allow_local");
            case AUTH_CAS:
                return $ilSetting->get("cas_allow_local");

        }
        return false;
    }



    public static function isPasswordModificationEnabled($a_authmode)
    {
        global $ilSetting;

        if (self::isPasswordModificationHidden()) {
            return false;
        }
        
        // begin-patch ldap_multiple
        // cast to int
        switch ((int) $a_authmode) {
            // No local passwords for these auth modes
            case AUTH_LDAP:
            case AUTH_RADIUS:
            case AUTH_ECS:
            case AUTH_SCRIPT:
            case AUTH_PROVIDER_LTI:
                return false;

            case AUTH_SAML:
                require_once 'Services/Saml/classes/class.ilSamlIdp.php';
                $idp = ilSamlIdp::getInstanceByIdpId(ilSamlIdp::getIdpIdByAuthMode($a_authmode));
                return $idp->isActive() && $idp->allowLocalAuthentication();
            
            // Always for and local
            case AUTH_LOCAL:
            case AUTH_APACHE:
                return true;

            // Read setting:
            case AUTH_SHIBBOLETH:
                return $ilSetting->get("shib_auth_allow_local");
            case AUTH_SOAP:
                return $ilSetting->get("soap_auth_allow_local");
            case AUTH_CAS:
                return $ilSetting->get("cas_allow_local");
        }
    }
    
    public static function supportsLocalPasswordValidation($a_authmode)
    {
        // begin-patch ldap_multiple
        // cast to int
        switch ((int) $a_authmode) {
            case AUTH_LDAP:
            case AUTH_LOCAL:
            case AUTH_RADIUS:
                return ilAuthUtils::LOCAL_PWV_FULL;
            
            case AUTH_SHIBBOLETH:
            case AUTH_SAML:
            case AUTH_SOAP:
            case AUTH_CAS:
                if (!ilAuthUtils::isPasswordModificationEnabled($a_authmode)) {
                    return ilAuthUtils::LOCAL_PWV_NO;
                }
                return ilAuthUtils::LOCAL_PWV_USER;
                
            case AUTH_PROVIDER_LTI:
            case AUTH_ECS:
            case AUTH_SCRIPT:
            case AUTH_APACHE:
            default:
                return ilAuthUtils::LOCAL_PWV_USER;
        }
    }
    
    // begin-patch auth_plugin
    public static function getAuthPlugins()
    {
        $pls = $GLOBALS['ilPluginAdmin']->getActivePluginsForSlot(
            IL_COMP_SERVICE,
            'Authentication',
            'authhk'
        );
        $pl_objs = array();
        foreach ($pls as $pl) {
            $pl_objs[] = $GLOBALS['ilPluginAdmin']->getPluginObject(
                IL_COMP_SERVICE,
                'Authentication',
                'authhk',
                $pl
            );
        }
        return $pl_objs;
    }
    // end-patch auth_plugins
    
    public static function getAuthModeTranslation($a_auth_key)
    {
        global $lng;
        
        switch ((int) $a_auth_key) {
            case AUTH_LDAP:
                include_once './Services/LDAP/classes/class.ilLDAPServer.php';
                $sid = ilLDAPServer::getServerIdByAuthMode($a_auth_key);
                $server = ilLDAPServer::getInstanceByServerId($sid);
                return $server->getName();
                
            case AUTH_PROVIDER_LTI:
                include_once './Services/LTI/classes/InternalProvider/class.ilAuthProviderLTI.php';
                $sid = ilAuthProviderLTI::getServerIdByAuthMode($a_auth_key);
                return ilAuthProviderLTI::lookupConsumer($sid);
                

            case AUTH_SAML:
                require_once 'Services/Saml/classes/class.ilSamlIdp.php';
                $idp_id = ilSamlIdp::getIdpIdByAuthMode($a_auth_key);
                $idp = ilSamlIdp::getInstanceByIdpId($idp_id);
                return $idp->getEntityId();

            default:
                return $lng->txt('auth_' . self::_getAuthModeName($a_auth_key));
        }
    }
}