Mount password protected Samba share with Kerberos ticket

My iMac is connected to the Active Directory server, with no additional GID and UID setup, I can login to the OS X using AD user credentials, but I also need to mount the Desktops and probably other shares. The problem is that I use Linux hosted Samba servers, and I need to push the Desktop's share path to the OS X clients somehow. I can mount that using OS X' Samba client, but I need to do that automatically. As I'm already authenticated against AD, there must be a way to use my Kerberos ticket to access the share without password, isn't it? Some guys say that it is possible with passwords stored in keychain, but I don't get it much, when are passwords stored in keychain? Should I add it once, and will that work forever?