chaining LoginModules in IDP ShibUserPassAuth

[Eugene Dvorkin]

Hi,
I have a requirement to create an IDP login page that will first check 
against database for a set of test
usernames/ passwords and then, if not found, use LDAP directory to 
search for users.
Can I combine LdapLoginModule with DatabaseLoginModule in some kind of 
chain in login.config file?

Thanks