[Samba] Logging successful log-ins

[Piers Kittel]

Hi all,

Due to a security breach at my office recently, we need to log 
successful / failed log-ins.  I've put in "log level = 3" in smb.conf on 
our active directory domain controller which seems to log what we need, 
however this is generating massive log files, due to it logging every 
file opening/closing by all users.  How do I log successful/failed 
log-ins without having to generate massive files?  Would it be possible 
to output just the successful/failed log-ins into its own log file?

Many thanks for help in advance!

Regards - Piers