This Apache LDAP authentication/authorization module tries to solve
the following problems that other such modules may not solve in all cases:
* Map the short form of the distinguished name of a certificate and its
issuer obtained from the environment of mod_ssl to a user distinguished
name in an LDAP directory.
* Check the age of a password in an LDAP directory, denying authorization
in case the password is to old.
* Authorize a user based on roles or an arbitrary LDAP filter expression.
* Authorize a user based on whether he owns a file or belongs to the group
owning a file.
