SSO

Shibboleth
http://shibboleth.internet2.edu/

OpenAM
http://forgerock.com/openam.html

Looks promising..supports integration with Spring but is very complex

Apache: enable/disable directory browsing (file listing)

disable file listing
assume we want to disable file listing in /var/www (i.e. all directories)

$ sudo cat /var/www/.htaccess
# disable directory listing
Options -Indexes