Server Security (User Level Security)
Server security mode is left over from the time when Samba was not capable of acting
as a domain member server. It is highly recommended not to use this feature. Server
security mode has many drawbacks that include:
Potential account lockout on MS Windows NT4/200x password servers.
Lack of assurance that the password server is the one specified.
Does not work with Winbind, which is particularly needed when storing profiles remotely.
This mode may open connections to the password server and keep them open for extended periods.
Security on the Samba server breaks badly when the remote password server suddenly shuts down.
With this mode there is NO security account in the domain that the password server belongs to for the Samba server.
In server security mode the Samba server reports to the client that it is in user-level security. The client
then does a session setup as described earlier. The Samba server takes the username/password that the client
sends and attempts to log into the
password server by sending exactly the same
username/password that it got from the client. If that server is in user-level security and accepts the
password, then Samba accepts the client's connection. This parameter allows the Samba server to use another
SMB server as the
You should also note that at the start of all this, when the server tells the client
what security level it is in, it also tells the client if it supports encryption. If it
does, it supplies the client with a random cryptkey. The client will then send all
passwords in encrypted form. Samba supports this type of encryption by default.
security = server means that Samba reports to clients that
it is running in
but actually passes off all authentication requests to another
user mode server. This requires an additional parameter
password server that points to
the real authentication server. The real authentication server can be another Samba server, or it can be a
Windows NT server, the latter being natively capable of encrypted password support.