Authentication

OpenSSH Public Key Authentication

http://sial.org/howto/openssh/publickey-auth/ notes on setting up SSH pubic key auth

Providing Active Directory authentication via Kerberos protocol in Apache

http://support.microsoft.com/kb/555092 Apache authentication against AD (via Kerberos). Really easy to do, but make sure you put your kerberos real all in UPPER CASE, i.e. MYDOMAIN.COM. If you are using something like MYDOMIAN, then put it into config as MYDOMAIN.LOCAL

[technet.microsoft.com] Interop: Authenticate Linux Clients with Active Directory

http://technet.microsoft.com/en-au/magazine/dd228986.aspx tehcnet article on providing authentication against AD using samba/winbind