configuration filessample ofThis appendix gives an example of a production smb.conf file and looks at how many of the options are used in practice. The following is a slightly disguised version of one we used at a corporation with five Linux servers, five Windows for Workgroups clients and three NT Workstation clients: # smb.conf -- File Server System for: 1 Example.COM BSC & Management Office [globals] workgroup = 1EG_BSC interfaces = 10.10.1.14/24 We provide this service on only one of the machine's interfaces. The interfaces option sets its address and netmask, where /24 is the same as using the netmask 255.255.255.0: comment = Samba ver. %v preexec = csh -c `echo /usr/samba/bin/smbclient \ -M %m -I %I` & We use the preexec command to log information about all connections by machine name (%m) and IP address (%I): # smbstatus will output various info on current status status = yes browseable = yes printing = bsd # the username that will be used for access to services # specified with 'guest = ok' guest account = samba The default guest account was nobody, uid -1, which produced log messages on one of our machines saying "your server is being unfriendly," so we created a specific Samba guest account for browsing and printing: # superuser account - admin privilages to shares, with no # restrictions # WARNING - use this with care: files can be modified, # regardless of file permissions admin users = root # who is NOT allowed to connect to ANY service invalid users = @wheel, mail, deamon, adt Daemons can't use Samba, only people. The invalid users option closes a security hole; it prevents intruders from breaking in by pretending to be a daemon process. # hosts that are ALLOWED or DENIED from connecting to ANY service hosts allow = 10.10.1. hosts deny = 10.10.1.6 # where the lock files will be located lock directory = /var/lock/samba/locks # debug log files # %m = separate log for each NetBIOS name (each machine) log file = /var/log/samba/log.%m # We send priority 0, 1 and 2 messages to the system logs syslog = 2 # If a WinPopup message is sent to the server, # redirect it to a user via e-mail message command = /bin/mail -s 'message from #% on %m' \ pkelly < %s; rm %s # --------------------------------------------------- # [globals] Performance Tuning # --------------------------------------------------- # caching algorithm to reduce time doing getwd() calls. getwd cache = yes socket options = TCP_NODELAY # tell the server whether the client is present and # responding in seconds keep alive = 60 # num minutes of inactivity before a connection is # considered dead dead time = 30 read prediction = yes share modes = yes max xmit = 17384 read size = 512 The share modes, max, xinit, and read size options are machine-specific (see Appendix B): # locking is done by the server locking = yes # control whether dos style attributes should be mapped # to unix execute bits map hidden = yes map archive = yes map system = yes The three map options will work only on shares with a create mode that includes the execute bits (0111). Our homes and printers shares won't honor them, but the [www] share will: # --------------------------------------------------------- # [globals] Security and Domain Logon Services # --------------------------------------------------------- # connections are made with UID and GID, not as shares security = user # boolean variable that controls whether passwords # will be encrypted encrypt passwords = yes passwd chat = "*New password:*" %n\r "*New password (again):*" %n\r \ "*Password changed*" passwd program = /usr/bin/passwd %u # Always become the local master browser domain master = yes preferred master = yes os level = 34 # For domain logons to work correctly. Samba acts as a # primary domain controller. domain logons = yes # Logon script to run for user off the server each time # username (%U) logs in. Set the time, connect to shares, # virus checks, etc. logon script = scripts\%U.bat [netlogon] comment = "Domain Logon Services" path = /u/netlogon writable = yes create mode = 444 guest ok = no volume = "Network" This share, discussed in Chapter 6, is required for Samba to work smoothly in a Windows NT domain: # ----------------------------------------------------------- # [homes] User Home Directories # ----------------------------------------------------------- [homes] comment = "Home Directory for : %u " path = /u/users/%u The password file of the Samba server specifies each person's home directory as /home/machine_name/person, which NFS converts to point to the actual physicl location under /u/users. The path option in the [homes] share tells Samba the actual (non-NFS) location: guest ok = no read only = no create mode = 644 writable = yes browseable = no # ----------------------------------------------------------- # [printers] System Printers # ----------------------------------------------------------- [printers] comment = "Printers" path = /var/spool/lpd/samba printcap name = /etc/printcap printable = yes public = no writable = no lpq command = /usr/bin/lpq -P%p lprm command = /usr/bin/lprm -P%p %j lppause command = /usr/sbin/lpc stop %p lpresume command = /usr/sbin/lpc start %p create mode = 0700 browseable = no load printers = yes # ----------------------------------------------------------- # Specific Descriptions: [programs] [data] [retail] # ----------------------------------------------------------- [programs] comment = "Shared Programs %T" volume = "programs" Shared Programs shows up in the Network Neighborhood, and programs is the volume name you specify when an installation program wants to know the label of the CD-ROM from which it thinks it's loading: path = /u/programs public = yes writeable = yes printable = no create mode = 664 [cdrom] comment = "Unix CDROM" path = /u/cdrom public = no writeable = no printable = no volume = "cdrom" [data] comment = "Data Directories %T" path = /u/data public = no create mode = 770 writeable = yes volume = "data" [nt4] comment = "NT4 Server" path = /u/systems/nt4 public = yes create mode = 770 writeable = yes volume = "nt4_server" [www] comment = "WWW System" path = /usr/www/http public = yes create mode = 775 writeable = yes volume = "www_system" The [www] share is the directory used on the Unix server to serve web pages. Samba makes the directory available to local PC users so the art department can update web pages.