vsftpd has an option
local_enable that allows FTP users to be directly mapped to local users. It even works without any extra effort with our Likewise Active Directory configuration.
I've been looking all over, and I can't seem to find an equivalent for Apache .htaccess. The auth providers seem to be file, DBM, LDAP and DBD. None of these seem to allow for HTTP auth user mapping to local user accounts.
Is there any way to do this? If not, why not?