If you wish to write a new authentication plugin please view the Authentication Stack API page that will describe the interface needed to write a plugin

Class	Plugin Name	Description
alreadyloggedin.class.php	Already Logged In	Allows you to stay logged in once you have logged in
apache.class.php	Apache Login	Support authentication via Apache modules from .htaccess files eg Basic auth
cosign.class.php	CoSign Login	Support cosign authentication
demo.class.php	Demo Mode	Handles demo functionality at login
fixedlist.class.php	Fixed List	An array of username/passwords
guestlogin.class.php	Guest Login	Provide Guest Login Button and links
impersonation.class.php	Impersonation	Allow demo display mode and sysadmin to impersonate other users
internaldb.class.php	Internal Database	The Standard Internal Database Authentication and password update
ldap.class.php	LDAP Login	LDAP Authentication
loginformfields.class.php	Login Form Fields	Allows extra fields on login box
ltilogin.class.php	LTI Login	Support authentication via LTI Launch and allows rogo users to be associated with LTI users

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