It's all there: Domains, Active Directory, Security
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Samba 3.0 fully implements Kerberos 5 authentication, SMB signing for tamper-proof file serving sessions, and SCHANNEL security for secure remote procedure calls. Samba 3.0 works "out of the box" with the improved security settings of Windows 2003 Domain Controllers.
Samba 3.0 seamlessly integrates into a Microsoft Active Directory domain in both native and mixed mode. Samba 3.0 provides single sign-on for UNIX ® / Linux ® clients in an Active Directory environment, allowing both servers and clients to transparently use Active Directory as an authentication and account source.