How do I point to a particular installation of simplesamlphp with the simplesamlphp_auth module?

Question

I am trying to integrate our company's SSO into our Drupal installation. As a POC to see if it even works, I have a copy of the SimpleSAMLPhp Library located at /foo/bar/simplesamlphp. I configured my apache vhost and the SAML configs and that's all fine for now.

Per the instructions from Acquia on this page, I tried installing the drupal/simplesamlphp_auth module.

composer require drupal/simplesamlphp_auth

This installed the module and as a dependency, installed a second copy of the simplesamlphp library in vendor/simplesamlphp. Now it looks like the module simplesamlphp_auth is using the installation in vendor.

How do I configure this module to use the one I already placed in /foo/bar/simplesamlphp? There doesn't seem to be any options on the page /admin/config/people/simplesamlphp_auth.

I have configuration files that I would like to avoid copying over to the vendor directory after each deployment if possible, since that's not as secure as keeping the configs outside of the project altogether.

EDIT 1

Clarification on the configuration files: I need to define configuration files in /foo/bar/simplesamlphp/config in order for it to work. These configuration files are missing from vendor/simplesamlphp/config and without them the application encounters a fatal error. As stated in the Acquia document above, the library lives outside of vendor/ or docroot/ in their setup.

Answer 1

You can just create a symlink to your temporary SAML folder

ln -s /foo/bar/simplesamlphp ./simplesaml

In settings.php add next line:

$settings['simplesamlphp_dir'] = '/foo/bar/simplesamlphp';

In config.php file in your /simplesamlphp/config library add following settings:

// Load necessary environmental data
$ps = json_decode($_SERVER['PRESSFLOW_SETTINGS'], TRUE);
$host = $_SERVER['HTTP_HOST'];
$db = $ps['databases']['default']['default'];

// Define basic variables
$config = array (
   'baseurlpath' => 'https://'. $host .':443/simplesaml/', // SAML should always connect via 443
   'certdir' => 'cert/',
   'loggingdir' => '/files/private/log/',
   'datadir' => 'data/',
   'tempdir' => '/tmp/simplesaml',
   'store.type' => 'sql',
   'store.sql.dsn' => 'mysql:host='. $db['host'] .';port='. $db['port'] .';dbname='. $db['database'],
   'store.sql.username' => $db['username'],
   'store.sql.password' => $db['password'],
);

Now if you open your-site.com/simplesaml url in the browser, /foo/bar/simplesamlphp library will be used instead of vendor folder.