SAML/Shibboleth with multiple IdP or optional on regular login page

api/js/login.js

@@ -57,6 +57,14 @@ egw_LAB.wait(function()
 			{ "svg": egw_webserverUrl+"/api/templates/default/images/login_discourse.svg", "url": "https://help.egroupware.org" },
 			{ "svg": egw_webserverUrl+"/api/templates/default/images/login_github.svg", "url": "https://github.com/EGroupware/egroupware" }
 		]);
+
+		// automatic submit of SAML IdP selection
+		jQuery('select.onChangeSubmit').on('change', function() {
+			if (this.value) {
+				this.form.method = 'GET';
+				this.form.submit();
+			}
+		});
 	});
 });
 

api/setup/setup.inc.php

@@ -70,6 +70,7 @@ $setup_info['api']['hooks']['vfs_rmdir'] = 'EGroupware\\Api\\Vfs\\Sharing::vfsUp
 
 // hook to update SimpleSAMLphp config
 $setup_info['api']['hooks']['setup_config'] = \EGroupware\Api\Auth\Saml::class.'::setupConfig';
+$setup_info['api']['hooks']['login_discovery'] = \EGroupware\Api\Auth\Saml::class.'::discovery';
 
 // installation checks
 $setup_info['api']['check_install'] = array(

api/src/Auth.php

@@ -53,20 +53,38 @@ class Auth
 	/**
 	 * Constructor
 	 *
+	 * @param Backend $type =null default is type from session / auth or login, or if not set config
 	 * @throws Exception\AssertionFailed if backend is not an Auth\Backend
 	 */
-	function __construct()
+	function __construct($type=null)
 	{
-		$this->backend = self::backend();
+		$this->backend = self::backend($type);
+	}
+
+	/**
+	 * Get current backend
+	 *
+	 * @return string
+	 */
+	public function backendType()
+	{
+		return Cache::getSession(__CLASS__, 'backend');
 	}
 
 	/**
 	 * Instanciate a backend
 	 *
-	 * @param Backend $type =null
+	 * Type will be stored in session, to automatic use the same type eg. for conditional use of SAML.
+	 *
+	 * @param Backend $type =null default is type from session / auth or login, or if not set config
+	 * @return Auth\Backend|Auth\BackendSSO
 	 */
 	static function backend($type=null)
 	{
+		if (is_null($type))
+		{
+			$type = Cache::getSession(__CLASS__, 'backend') ?: null;
+		}
 		// do we have a hostname specific auth type set
 		if (is_null($type) && !empty($GLOBALS['egw_info']['server']['auth_type_host']) &&
 			Header\Http::host() === $GLOBALS['egw_info']['server']['auth_type_hostname'])
@@ -88,18 +106,49 @@ class Auth
 		{
 			throw new Exception\AssertionFailed("Auth backend class $backend_class is NO EGroupware\\Api\Auth\\Backend!");
 		}
+		Cache::setSession(__CLASS__, 'backend', $type);
+
 		return $backend;
 	}
 
 	/**
 	 * Attempt a SSO login
 	 *
+	 * A different then the default backend can be selected by setting request parameter auth to the backend or
+	 * setting "auth=$backend" to an arbitrary value eg. with a submit button named like that.
+	 * To secure this behavior the server config "${auth}_discovery" has to be set (to a non-empty value)!
+	 *
 	 * @return string sessionid on successful login or null
 	 * @throws Exception\AssertionFailed
 	 */
 	static function login()
 	{
-		$backend = self::backend();
+		if (!empty($_REQUEST['auth']))
+		{
+			$type = $_REQUEST['auth'];
+		}
+		elseif (($auth = array_filter($_REQUEST, function($key)
+			{
+				return substr($key, 0, 5) === 'auth=';
+			}, ARRAY_FILTER_USE_KEY)))
+		{
+			$type = substr(key($auth), 5);
+		}
+		// to not allow enabling all sort of auth plugins by simply calling login.php?auth=xyz we require the
+		// plugin to be enabled via "${auth}_discovery" server config
+		if (!empty($type) && empty($GLOBALS['egw_info']['server'][$type.'_discovery']))
+		{
+			$type = null;
+		}
+
+		// now we need a (not yet authenticated) session so SAML / auth source selected "survives" eg. the SAML redirects
+		if (!empty($type) && !Session::get_sessionid())
+		{
+			session_start();
+			Session::egw_setcookie(Session::EGW_SESSION_NAME, session_id());
+		}
+
+		$backend = self::backend($type ?? null);
 
 		return $backend instanceof  Auth\BackendSSO ? $backend->login() : null;
 	}
@@ -110,11 +159,9 @@ class Auth
 	 * @return null
 	 * @throws Exception\AssertionFailed
 	 */
-	static function logout()
+	function logout()
 	{
-		$backend = self::backend();
-
-		return $backend instanceof Auth\BackendSSO ? $backend->logout() : null;
+		return $this->backend instanceof Auth\BackendSSO ? $this->backend->logout() : null;
 	}
 
 	/**
@@ -125,11 +172,9 @@ class Auth
 	 *
 	 * @return array of needed keys in session
 	 */
-	static function needSession()
+	function needSession()
 	{
-		$backend = self::backend();
-
-		return method_exists($backend, 'needSession') ? $backend->needSession() : [];
+		return method_exists($this->backend, 'needSession') ? $this->backend->needSession() : [];
 	}
 
 	/**

api/src/Auth/Saml.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * EGroupware API - Authentication via SAML or everything supported by SimpleSAMLphp
+ * EGroupware API - Authentication via SAML, Shibboleth or everything supported by SimpleSAMLphp
  *
  * @link https://www.egroupware.org
  * @link https://simplesamlphp.org/docs/stable/
@@ -16,59 +16,46 @@ use SimpleSAML;
 use EGroupware\Api\Exception;
 
 /**
- * Authentication based on SAML or everything supported by SimpleSAMLphp
+ * Authentication based on SAML, Shibboleth or everything supported by SimpleSAMLphp
  *
  * SimpleSAMLphp is installed together with EGroupware and a default configuration is created in EGroupware
- * files subdirectory "saml", once "Saml" is set as authentication method in setup and eg. the login page is loaded.
+ * files subdirectory "saml" eg. when you first store it's configuration in Setup > Configuration > SAML/Shibboleth
  *
- * It will NOT work, before you configure at least one IdP (Identity Provider) for the default-sp (Service Provider) in saml/authsourcres.php:
+ * Storing setup configuration modifies the following files:
+ * a) $files_dir/saml/config.php
+ * b) $files_dir/saml/authsources.php (only "default-sp" is used currently)
+ * c) $files_dir/saml/metadata/*
+ * d) $files_dir/saml/cert/*
+ * Modification is only on certain values, everything else can be edited to suit your needs.
  *
- *	// An authentication source which can authenticate against both SAML 2.0
- *	// and Shibboleth 1.3 IdPs.
- *	'default-sp' => [
- *		'saml:SP',
+ * Initially also a key-pair is generated as $files_dir/saml/cert/saml.{pem,crt}.
+ * If you want or have to use a different certificate, best replace these with your files (they are referenced multiple times!).
+ * They must stay in the files directory and can NOT be symlinks to eg. /etc, as only files dir is mounted into the container!
  *
- *		// The entity ID of this SP.
- *		// Can be NULL/unset, in which case an entity ID is generated based on the metadata URL.
- *		'entityID' => null,
+ * Authentication / configuration can be tested independent of EGroupware by using https://example.org/egroupware/saml/
+ * with the "admin" user and password stored in cleartext in $files_dir/saml/config.php under 'auth.adminpassword'.
  *
- *		// The entity ID of the IdP this SP should contact.
- *		// Can be NULL/unset, in which case the user will be shown a list of available IdPs.
- *		'idp' => 'https://samltest.id/saml/idp',
- *
- * And the IdP's metadata in saml/metadata/saml20-idp-remote.php
- *
- *		$metadata['https://samltest.id/saml/idp'] = [
- *			'SingleSignOnService'  => 'https://samltest.id/idp/profile/SAML2/Redirect/SSO',
- *			'SingleLogoutService'  => 'https://samltest.id/idp/profile/Logout',
- *			'certificate'          => 'samltest.id.pem',
- *		];
- *
- * https://samltest.id/ is just a SAML / Shibboleth test side allowing AFTER uploading your metadata to test with a couple of static test-accounts.
- *
- * The metadata can be downloaded by via https://example.org/egroupware/saml/ under Federation, it also allows to test the authentication.
- * The required (random) Admin password can be found in /var/lib/egrouwpare/default/saml/config.php searching for auth.adminpassword.
- *
- * Alternativly you can also modify the following metadata example by replacing https://example.org/ with your domain:
- *
- * <?xml version="1.0"?>
- * <md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" entityID="https://example.org/egroupware/saml/module.php/saml/sp/metadata.php/default-sp">
- * <md:SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol urn:oasis:names:tc:SAML:1.1:protocol">
- * <md:SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="https://example.org/egroupware/saml/module.php/saml/sp/saml2-logout.php/default-sp"/>
- * <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://example.org/egroupware/saml/module.php/saml/sp/saml2-acs.php/default-sp" index="0"/>
- * <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:1.0:profiles:browser-post" Location="https://example.org/egroupware/saml/module.php/saml/sp/saml1-acs.php/default-sp" index="1"/>
- * <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Artifact" Location="https://example.org/egroupware/saml/module.php/saml/sp/saml2-acs.php/default-sp" index="2"/>
- * <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:1.0:profiles:artifact-01" Location="https://example.org/egroupware/saml/module.php/saml/sp/saml1-acs.php/default-sp/artifact" index="3"/>
- * </md:SPSSODescriptor>
- * <md:ContactPerson contactType="technical">
- * <md:GivenName>Admin</md:GivenName>
- * <md:SurName>Name</md:SurName>
- * <md:EmailAddress>mailto:admin@example.org</md:EmailAddress>
- * </md:ContactPerson>
- * </md:EntityDescriptor>
+ * There are basically three possible scenarios currently supported:
+ * a) a single IdP and SAML configured as authentication method
+ * --> gives full SSO (login page is never displayed, it directly redirects to the IdP)
+ * b) one or multiple IdP, a discovery label and an other authentication type eg. SQL configured
+ * --> uses the login page for local accounts plus a button or selectbox (depending on number of IdPs) to start SAML login
+ * c) multiple IdP and SAML configured as authentication method
+ * --> SimpleSAML discovery/selection page with a checkbox to remember the selection (SSO after first selection)
  */
 class Saml implements BackendSSO
 {
+	/**
+	 * Which entry in authsources.php to use.
+	 * 
+	 * Setup > configuration always modifies "default-sp"
+	 * 
+	 * A different SP can be configured via header.inc.php by adding at the end:
+	 *
+	 * EGroupware\Api\Auth\Saml::$auth_source = "other-sp";
+	 */
+	static public $auth_source = 'default-sp';
+
 	/**
 	 * Constructor
 	 */
@@ -79,7 +66,7 @@ class Saml implements BackendSSO
 	}
 
 	/**
-	 * authentication against SAML
+	 * Authentication against SAML
 	 *
 	 * @param string $username username of account to authenticate
 	 * @param string $passwd corresponding password
@@ -89,7 +76,7 @@ class Saml implements BackendSSO
 	function authenticate($username, $passwd, $passwd_type='text')
 	{
 		// login (redirects to IdP)
-		$as = new SimpleSAML\Auth\Simple('default-sp');
+		$as = new SimpleSAML\Auth\Simple(self::$auth_source);
 		$as->requireAuth();
 
 		return true;
@@ -125,12 +112,13 @@ class Saml implements BackendSSO
 	function login()
 	{
 		// login (redirects to IdP)
-		$as = new SimpleSAML\Auth\Simple('default-sp');
-		$as->requireAuth();
+		$as = new SimpleSAML\Auth\Simple(self::$auth_source);
+		$as->requireAuth(preg_match('|^https://|', $_REQUEST['auth=saml']) ?
+			['saml:idp' => $_REQUEST['auth=saml']] : []);
 
-		// cleanup session for EGroupware
+		/* cleanup session for EGroupware: currently NOT used as we share the session with SimpleSAMLphp
 		$session = SimpleSAML\Session::getSessionFromRequest();
-		$session->cleanup();
+		$session->cleanup();*/
 
 		// get attributes for (automatic) account creation
 		$attrs = $as->getAttributes();
@@ -159,8 +147,8 @@ class Saml implements BackendSSO
 	 */
 	function logout()
 	{
-		$as = new SimpleSAML\Auth\Simple('default-sp');
-		$as->logout();
+		$as = new SimpleSAML\Auth\Simple(self::$auth_source);
+		if ($as->isAuthenticated()) $as->logout();
 	}
 
 	/**
@@ -173,7 +161,48 @@ class Saml implements BackendSSO
 	 */
 	function needSession()
 	{
-		return ['SimpleSAMLphp_SESSION'];
+		return ['SimpleSAMLphp_SESSION', Api\Session::EGW_APPSESSION_VAR];	// Auth stores backend via Cache::setSession()
+	}
+
+	const IDP_DISPLAY_NAME = 'OrganizationDisplayName';
+
+	/**
+	 * Display a IdP selection / discovery
+	 *
+	 * Will be displayed if IdP(s) are added in setup and a discovery label is specified.
+	 *
+	 * @return string|null html to display in login page or null to disable the selection
+	 */
+	static public function discovery()
+	{
+		if (empty($GLOBALS['egw_info']['server']['saml_discovery']) ||
+			!($metadata = self::metadata()))
+		{
+			return null;
+		}
+		//error_log(__METHOD__."() metadata=".json_encode($metadata));
+		$lang = Api\Translation::$userlang;
+		$select = ['' => $GLOBALS['egw_info']['server']['saml_discovery']];
+		foreach($metadata as $idp => $data)
+		{
+			$select[$idp] = $data[self::IDP_DISPLAY_NAME][$lang] ?: $data[self::IDP_DISPLAY_NAME]['en'];
+		}
+		return count($metadata) > 1 ?
+			Api\Html::select('auth=saml', '', $select, true, 'class="onChangeSubmit"') :
+			Api\Html::input('auth=saml', $GLOBALS['egw_info']['server']['saml_discovery'], 'submit', 'formmethod="get"');
+	}
+
+	/**
+	 * @return array IdP => metadata pairs
+	 */
+	static public function metadata($files_dir=null)
+	{
+		$metadata = [];
+		if (file_exists($file = ($files_dir ?: $GLOBALS['egw_info']['server']['files_dir']).'/saml/metadata/saml20-idp-remote.php'))
+		{
+			include $file;
+		}
+		return $metadata;
 	}
 
 	const ASYNC_JOB_ID = 'saml_metadata_refresh';
@@ -190,11 +219,7 @@ class Saml implements BackendSSO
 	{
 		$config =& $location['newsettings'];
 
-		/*error_log(__METHOD__."() ".json_encode(array_filter($config, function($value, $key) {
-			return substr($key, 0, 5) === 'saml_' || $key === 'auth_type';
-		}, ARRAY_FILTER_USE_BOTH), JSON_UNESCAPED_SLASHES));*/
-
-		if (empty($config['saml_idp'])) return;	// nothing to do, if not idp defined
+		if (empty($config['saml_idp'])) return;	// nothing to do, if no idp defined
 
 		if (file_exists($config['files_dir'].'/saml/config.php'))
 		{
@@ -204,7 +229,6 @@ class Saml implements BackendSSO
 
 		// install or remove async job to refresh metadata
 		static $freq2times = [
-			'hourly' => ['min' => 4],	// hourly at minute 4
 			'daily'  => ['min' => 4, 'hour' => 4],	// daily at 4:04am
 			'weekly' => ['min' => 4, 'hour' => 4, 'dow' => 5],	// Saturdays as 4:04am
 		];
@@ -219,12 +243,37 @@ class Saml implements BackendSSO
 			$async->cancel_timer(self::ASYNC_JOB_ID);
 		}
 
+		// only refresh metadata if we have to, or request by user
 		if ($config['saml_metadata_refresh'] !== 'no')
 		{
-			self::refreshMetadata($config);
+			$metadata = self::metadata($config['files_dir']);
+			$idps = self::splitIdP($config['saml_idp']);
+			foreach($idps as $idp)
+			{
+				if (!isset($metadata[$idp]))
+				{
+					$metadata = [];
+					break;
+				}
+			}
+			if (count($metadata) !== count($idps) || $config['saml_metadata_refresh'] === 'now')
+			{
+				self::refreshMetadata($config);
+			}
 		}
 	}
 
+	/**
+	 * Split multiple IdP
+	 *
+	 * @param string $config
+	 * @return string[]
+	 */
+	private static function splitIdP($config)
+	{
+		return preg_split('/[\n\r ]+/', trim($config)) ?: [];
+	}
+
 	/**
 	 * Refresh metadata
 	 *
@@ -241,7 +290,8 @@ class Saml implements BackendSSO
 
 		$source = [
 			'src' => $config['saml_metadata'],
-			'whitelist' => [$config['saml_idp']],	// only ready our idp, the whole thing can be huge
+			// only read/configure our idp(s), the whole thing can be huge
+			'whitelist' => self::splitIdP($config['saml_idp']),
 		];
 		if (!empty($config['saml_certificate']))
 		{
@@ -271,7 +321,15 @@ class Saml implements BackendSSO
 		$GLOBALS['egw_info']['server']['usecookies'] = true;
 		$config['baseurlpath'] = Api\Framework::getUrl(Api\Egw::link('/saml/'));
 		$config['username_oid'] = [self::usernameOid($config)];
-
+		// if multiple IdP's are configured, do NOT specify one to let user select
+		if (count(self::splitIdP($config['saml_idp'])) > 1)
+		{
+			unset($config['saml_idp']);
+		}
+		else
+		{
+			$config['saml_idp'] = trim($config['saml_idp']);
+		}
 		// update config.php and default-sp in authsources.php
 		foreach([
 			'authsources.php' => [
@@ -445,12 +503,18 @@ class Saml implements BackendSSO
 
 					case 'authsources.php':
 						$replacements = [
-							"'idp' => null," => "'idp' => ".self::quote($config['saml_idp']).',',
+							"'idp' => null," => "'idp' => ".self::quote(
+								count(self::splitIdP($config['saml_idp'])) <= 1 ? trim($config['saml_idp']) : null).',',
 							"'discoURL' => null," => "'discoURL' => null,\n\n".
 								// add our private and public keys
 								"\t'privatekey' => 'saml.pem',\n\n".
 								"\t// to include certificate in metadata\n".
 								"\t'certificate' => 'saml.crt',\n\n".
+								"\t// new certificates for rotation: add new, wait for IdP sync, swap old and new, wait, comment again\n".
+								"\t//'new_privatekey' => 'new-saml.pem',\n".
+								"\t//'new_certificate' => 'new-saml.crt',\n\n".
+								"\t// logout is NOT signed by default, but signature is required from the uni-kl.de IdP for logout\n".
+								"\t'sign.logout' => true,\n\n".
 								"\t'name' => [\n".
 								"\t\t'en' => ".self::quote($config['saml_sp'] ?: 'EGroupware').",\n".
 								"\t],\n\n".

api/src/Cache.php

@@ -402,7 +402,7 @@ class Cache
 	 */
 	static public function &getSession($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
 	{
-		if (isset($_SESSION[Session::EGW_SESSION_ENCRYPTED]))
+		if (!isset($_SESSION) || isset($_SESSION[Session::EGW_SESSION_ENCRYPTED]))
 		{
 			if (Session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
 			return null;	// can no longer store something in the session, eg. because commit_session() was called

api/src/Db.php

@@ -585,7 +585,7 @@ class Db
 		{
 			foreach(get_included_files() as $file)
 			{
-				if (strpos($file,'adodb') !== false && !in_array($file,(array)$_SESSION['egw_required_files']))
+				if (strpos($file,'adodb') !== false && !in_array($file,(array)$_SESSION['egw_required_files']) && isset($_SESSION))
 				{
 					$_SESSION['egw_required_files'][] = $file;
 					//error_log(__METHOD__."() egw_required_files[] = $file");

api/src/Framework/Login.php

@@ -81,6 +81,23 @@ class Login
 				$tmpl->set_var('2fa_class', 'et2_required');
 			}
 		}
+
+		// check if we need some discovery (select login options eg. a SAML IdP), hide it if not
+		$discovery = '';
+		foreach(Api\Hooks::process('login_discovery', [], true) as $app => $data)
+		{
+			if (!empty($data)) $discovery .= $data;
+		}
+		if (!empty($discovery))
+		{
+			$tmpl->set_var('discovery', $discovery);
+		}
+		else
+		{
+			$tmpl->set_block('login_form','discovery_block');
+			$tmpl->set_var('discovery_block', '');
+		}
+
 		// hide change-password fields, if not requested
 		if (!$change_passwd)
 		{

api/src/Session.php

@@ -1444,9 +1444,11 @@ class Session
 		if (!$GLOBALS['egw_info']['user']['sessionid'] || $sessionid == $GLOBALS['egw_info']['user']['sessionid'])
 		{
 			// eg. SAML logout will fail, if there is no more session --> remove everything else
-			if (($needed = Auth::needSession()) && array_intersect($needed, array_keys($_SESSION)))
+			$auth = new Auth();
+			if (($needed = $auth->needSession()) && array_intersect($needed, array_keys($_SESSION)))
 			{
-				$_SESSION = array_intersect_key($_SESSION['SimpleSAMLphp_SESSION'], array_flip($needed));
+				$_SESSION = array_intersect_key($_SESSION, array_flip($needed));
+				Auth::backend($auth->backendType());	// backend is stored in session
 				return true;
 			}
 			if (self::ERROR_LOG_DEBUG) error_log(__METHOD__." ********* about to call session_destroy!");

logout.php

@@ -39,6 +39,8 @@ elseif(strpos($redirectTarget, '[?&]cd=') !== false)
 
 if ($verified)
 {
+	$auth = new Api\Auth();
+
 	// remove remember me cookie on explicit logout, unless it is a second factor
 	if ($GLOBALS['egw']->session->removeRememberMeTokenOnLogout())
 	{
@@ -53,7 +55,7 @@ Api\Session::egw_setcookie('kp3');
 Api\Session::egw_setcookie('domain');
 
 // SSO Logout (does not return for SSO systems)
-Api\Auth::logout();
+if (isset($auth)) $auth->logout();
 
 // $GLOBALS['egw']->redirect($redirectTarget);
 ?>

pixelegg/less/layout_loginPage.less

@@ -265,7 +265,7 @@ div#loginMainDiv.stockLoginBackground {
 					margin-top: 7px;
 					width: auto;
 				}
-				input[type="submit"] {
+				input[type="submit"], select.onChangeSubmit {
 					background-color: #0a5ca5;
 					.color_0_gray;
 					.fontsize_xxl;
@@ -275,6 +275,9 @@ div#loginMainDiv.stockLoginBackground {
 					&:focus {}
 					margin-top: 25px;
 				}
+				select.onChangeSubmit {
+					padding-left: 25px;
+				}
 				.registration {
 					font-size: 11px;
 					a:not(:first-child) {

pixelegg/login.tpl

@@ -28,6 +28,13 @@
                         <input type="hidden" name="account_type" value="u" />
                     </td>
                 </tr>
+	            <!-- BEGIN discovery_block -->
+	            <tr>
+		            <td>
+                        {discovery}
+		            </td>
+	            </tr>
+	            <!-- END discovery_block -->
                 <tr>
                     <td>
 						<span class="field_icons username"></span>

pixelegg/login_mobile.tpl

@@ -75,6 +75,13 @@
 					</td>
                 </tr>
                 <!-- END domain_selection -->
+	            <!-- BEGIN discovery_block -->
+	            <tr>
+		            <td>
+                        {discovery}
+		            </td>
+	            </tr>
+	            <!-- END discovery_block -->
                <!-- BEGIN change_password -->
                 <tr>
                     <td>

saml/_egw_include.php

@@ -9,21 +9,26 @@
  * @subpackage authentication
  */
 
+use EGroupware\Api;
+
 // we have to set session-cookie name used by EGroupware!
 ini_set('session.name', 'sessionid');
 
+require_once __DIR__.'/../api/src/autoload.php';
+
 $GLOBALS['egw_info'] = [
 	'flags' => [
 		//'currentapp' => 'login',	// db connection, no auth
 		'noapi' => true,	// no db connection, but autoloader, files_dir MUST be set correct!
 	],
 	'server' => [
-		'files_dir' => '/var/lib/egroupware/default/files',
-		'temp_dir'  => '/tmp',
+		// default files and temp directories for name based instances (eg. our hosting) or container installation
+		'files_dir' => file_exists('/var/lib/egroupware/'.Api\Header\Http::host().'/files') ?
+			'/var/lib/egroupware/'.Api\Header\Http::host().'/files' : '/var/lib/egroupware/default/files',
+		'temp_dir'  => file_exists('/var/lib/egroupware/'.Api\Header\Http::host().'/tmp') ?
+			'/var/lib/egroupware/'.Api\Header\Http::host().'/tmp' : '/tmp',
 	],
 ];
 require_once __DIR__.'/../header.inc.php';
 
-use EGroupware\Api;
-
 Api\Auth\Saml::checkDefaultConfig();

setup/templates/default/config.tpl

@@ -478,9 +478,14 @@
     <td colspan="2"><b>{lang_If_using_SAML_2.0 / Shibboleth / SimpleSAMLphp}:</b></td>
    </tr>
 
+   <tr class="row_off">
+    <td>{lang_Label_to_display_as_option_on_login_page}:<br/>{lang_or_leave_empty_and_select_SAML_as_authentication_type_above_for_single_sign_on}</td>
+    <td><input name="newsettings[saml_discovery]" placeholder="{lang_University_Login}" value="{value_saml_discovery}" size="20" /></td>
+   </tr>
+
    <tr class="row_on">
-    <td>{lang_Identity_Provider}:</td>
-    <td><input name="newsettings[saml_idp]" placeholder="https://idp.rhrk.uni-kl.de/idp/shibboleth" value="{value_saml_idp}" size="64" /></td>
+    <td>{lang_Identity_Provider}:<br/>{lang_You_can_specify_multiple_IdP_on_separate_lines.}</td>
+    <td><textarea name="newsettings[saml_idp]" placeholder="https://idp.rhrk.uni-kl.de/idp/shibboleth" rows="3" cols="64">{value_saml_idp}</textarea></td>
    </tr>
 
    <tr class="row_off">
@@ -490,7 +495,6 @@
      <select name="newsettings[saml_metadata_refresh]">
       <option value="daily"{selected_saml_metadata_refresh_daily}>{lang_daily}</option>
       <option value="weekly"{selected_saml_metadata_refresh_weekly}>{lang_weekly}</option>
-      <option value="hourly"{selected_saml_metadata_refresh_hourly}>{lang_hourly}</option>
       <option value="no"{selected_saml_metadata_refresh_no}>{lang_not_automatic}</option>
       <option value="now"{selected_saml_metadata_refresh_now}>{lang_just_now}</option>
      </select>
@@ -536,7 +540,11 @@
    </tr>
 
    <tr class="row_off">
-    <td colspan="2">{lang_The_used_SimpleSAMLphp_allows_a_lot_more_configuration_/_different_authentication_types_via_its_config_files in} {value_files_dir}/saml</td>
+    <td colspan="2">
+      {lang_The_used_SimpleSAMLphp_allows_a_lot_more_configuration_/_different_authentication_types_via_its_config_files in} {value_files_dir}/saml<br/>
+      {lang_More_information}: <a target="_blank" href="https://github.com/EGroupware/egroupware/blob/master/api/src/Auth/Saml.php#L19">
+        https://github.com/EGroupware/egroupware/blob/master/api/src/Auth/Saml.php</a>
+    </td>
    </tr>
 
    <tr class="row_off">