Single Sign On for linux
I'd like to know your opions about Single Sign On (SSO) for linux (Debian). In my company, clients want to access to different services (FTP, HTTP, Mail, Web Applications ). I think about OpenLDAP and Proxy (Squid, Vulture) to resolve this problem but I don't know if they are secure. Are there others solutions for this SSO problem ? The more secure, the better it is.
Any suggestion will be welcome and thankful.