libapache2-mod-authn-sasl 1.2-2 (amd64 binary) in ubuntu saucy

 This module provides the mod_auth_basic authentication front-end
 a way to authenticate users by checking credentials via the Cyrus SASL library.
 .
 Username and password are checked against the SASL password checking backends,
 kerberos5, pam, rimap, shadow and ldap are some of the supported mechanisms.
 .
 One of the interesting parts of using a SASL backend is that you do not need
 to elevate Apache HTTPD's access rights to superuser privileges, even when
 validating through shadow database.