htpasswd

You can generate the username and password using htpasswd. New file:

$ htpasswd -c /srv/auth/.htpasswd squire

To append to existing file:

$ htpasswd -b /srv/auth/.htpasswd squire2 tickleme2

Checar en la directiva httpd.conf

AuthUserFile ‘/some/other/dir/.htpasswd’

Fuente:  http://serverfault.com/questions/127708/how-to-configure-basic-authentication-in-apache-httpd-virtual-hosts