/**
 * 
 * Module: LDAP Authenticate
 *
 * Authenticate a user against an LDAP directory
 * Useful for Windows Active Directory and other LDAP-based organisations
 * to maintain a single password across the organisation.
 *
 * Optionally authenticates only if a member of a given group in the directory.
 *
 * The person must have registered with Friendica using the normal registration 
 * procedures in order to have a Friendica user record, contact, and profile.
 *
 * Note when using with Windows Active Directory and/or LDAP over TLS/SSL: you may
 * need to set TLS_CACERT in your site ldap.conf file to the signing cert for your LDAP server.
 * This is a fiddly setting which may require some research to set correctly.
 * Typically on Linux installations this will be set to /etc/ssl/certs/ca-certificates.crt
 * You may need to export the signing certificate from your domain controller 
 * (which is often self-signed) and append that to this file.   
 *
 * In rare cases you may get around this (with a loss of SSL validation) by setting
 *     TLS_REQCERT never
 * but be aware that this configuration applies to all LDAP usage on the server and this could
 * result in weaker security for other LDAP applications. 
 * 
 * The required configuration options for this module may be set in the .htconfig.php file
 * e.g.:
 *
 * $a->config['ldapauth']['ldap_server'] = 'host.example.com';
 *
 * Parameters:
 * ldap_server = DNS hostname of LDAP service, or URL e.g. ldaps://example.com
 * ldap_binddn = LDAP DN of an account to bind with to search LDAP
 * ldap_bindpw = password for LDAP bind DN
 * ldap_searchdn = base DN for the search root of the LDAP directory
 * ldap_userattr = the name of the attribute containing the username, e.g. SAMAccountName
 * ldap_group = (optional) DN of group to check membership
 * create_account = (optional) 1 or 0 (default), automatically create Hubzilla accounts based on the LDAP 'mail' attribute
 *
 */


...etc.