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+<html><head><title>Joining an NT Domain with Samba 2.0</title>
+
+<link rev="made" href="mailto:samba-bugs@samba.anu.edu.au">
+</head>
+<body>
+
+<hr>
+
+<h1>Joining an NT Domain with Samba 2.0</h1>
+<h2>Jeremy Allison, Samba Team</h2>
+<h2>11th November 1998</h2>
+
+
+
+<p><hr><p><br>
+<p><br><center>Joining an NT Domain with Samba 2.0 </center>
+<center>----------------------------------- </center>
+<p><br>In order for a Samba-2 server to join an NT domain, you must first add
+the NetBIOS name of the Samba server to the NT domain on the PDC using
+Server Manager for Domains. This creates the machine account in the
+domain (PDC) SAM.
+<p><br>Assume you have a Samba-2 server with a NetBIOS name of <code>SERV1</code> and are
+joining an NT domain called <code>DOM</code>, which has a PDC with a NetBIOS name
+of <code>DOMPDC</code> and two backup domain controllers with NetBIOS names <code>DOMBDC1</code>
+and <code>DOMBDC2</code>.
+<p><br>In order to join the domain, first stop all Samba daemons and run the
+command
+<p><br><code>smbpasswd -j DOM -r DOMPDC</code>
+<p><br>as we are joining the domain DOM and the PDC for that domain (the only
+machine that has write access to the domain SAM database). If this is
+successful you will see the message:
+<p><br><code>smbpasswd: Joined domain DOM.</code>
+<p><br>in your terminal window. See the <a href="smbpasswd.8.html"><strong>smbpasswd</strong></a>
+man page for more details.
+<p><br>This command goes through the machine account password change
+protocol, then writes the new (random) machine account password for
+this Samba server into the a file in the same directory in which an
+smbpasswd file would be stored (normally :
+<p><br><code>/usr/local/samba/private</code>
+<p><br>The filename looks like this:
+<p><br><code>&lt;NT DOMAIN NAME&gt;.&lt;Samba Server Name&gt;.mac</code>
+<p><br>The <code>.mac</code> suffix stands for machine account password file. So in
+our example above, the file would be called:
+<p><br><code>DOM.SERV1.mac</code>
+<p><br>This file is created and owned by root and is not readable by any
+other user. It is the key to the domain-level security for your
+system, and should be treated as carefully as a shadow password file.
+<p><br>Now, before restarting the Samba daemons you must edit your
+<a href="smb.conf.5.html"><strong>smb.conf</strong></a> file to tell Samba it should now
+use domain security.
+<p><br>Change (or add) your
+<p><br><a href="smb.conf.5.html#security"><strong>"security ="</strong></a>
+<p><br>line in the <a href="smb.conf.5.html#global"><strong>[global]</strong></a> section of your
+<a href="smb.conf.5.html"><strong>smb.conf</strong></a> to read:
+<p><br><code>security = domain</code>
+<p><br>Next change the
+<p><br><a href="smb.conf.5.html#workgroup"><strong>"workgroup ="</strong></a>
+<p><br>line in the <a href="smb.conf.5.html#global"><strong>[global]</strong></a> section to read:
+<p><br><code>workgroup = DOM</code>
+<p><br>as this is the name of the domain we are joining.
+<p><br>Finally, add (or modify) a:
+<p><br><a href="smb.conf.5.html#passwordserver"><strong>"password server ="</strong></a>
+<p><br>line in the <a href="smb.conf.5.html#global"><strong>[global]</strong></a> section to read:
+<p><br><code>password server = DOMPDC DOMBDC1 DOMBDC2</code>
+<p><br>These are the primary and backup domain controllers Samba will attempt
+to contact in order to authenticate users. Samba will try to contact
+each of these servers in order, so you may want to rearrange this list
+in order to spread out the authentication load among domain
+controllers.
+<p><br>Currently, Samba requires that a defined list of domain controllers be
+listed in this parameter in order to authenticate with domain-level
+security. NT does not use this method, and will either broadcast or
+use a WINS database in order to find domain controllers to
+authenticate against.
+<p><br>Originally, I considered this idea for Samba, but dropped it because
+it seemed so insecure. However several Samba-2 alpha users have
+requested that this feature be added to make Samba more NT-like, so
+I'll probably add a special name of <code>'*'</code> (which means: act like NT
+when looking for domain controllers) in a future release of the
+code. At present, however, you need to know where your domain
+controllers are.
+<p><br>Finally, restart your Samba daemons and get ready for clients to begin
+using domain security!
+<p><br><center>Why is this better than security = server? </center>
+<center>------------------------------------------ </center>
+<p><br>Currently, domain security in Samba doesn't free you from having to
+create local Unix users to represent the users attaching to your
+server. This means that if domain user <code>DOM\fred</code> attaches to your
+domain security Samba server, there needs to be a local Unix user fred
+to represent that user in the Unix filesystem. This is very similar to
+the older Samba security mode <a href="smb.conf.5.html#securityequalserver"><strong>"security=server"</strong></a>, where Samba would pass
+through the authentication request to a Windows NT server in the same
+way as a Windows 95 or Windows 98 server would.
+<p><br>The advantage to domain-level security is that the authentication in
+domain-level security is passed down the authenticated RPC channel in
+exactly the same way that an NT server would do it. This means Samba
+servers now participate in domain trust relationships in exactly the
+same way NT servers do (i.e., you can add Samba servers into a
+resource domain and have the authentication passed on from a resource
+domain PDC to an account domain PDC.
+<p><br>In addition, with <a href="smb.conf.5.html#securityequalserver"><strong>"security=server"</strong></a> every Samba daemon on a
+server has to keep a connection open to the authenticating server for
+as long as that daemon lasts. This can drain the connection resources
+on a Microsoft NT server and cause it to run out of available
+connections. With <a href="smb.conf.5.html#securityequaldomain"><strong>"security =domain"</strong></a>, however, the Samba
+daemons connect to the PDC/BDC only for as long as is necessary to
+authenticate the user, and then drop the connection, thus conserving
+PDC connection resources.
+<p><br>And finally, acting in the same manner as an NT server authenticating
+to a PDC means that as part of the authentication reply, the Samba
+server gets the user identification information such as the user SID,
+the list of NT groups the user belongs to, etc. All this information
+will allow Samba to be extended in the future into a mode the
+developers currently call appliance mode. In this mode, no local Unix
+users will be necessary, and Samba will generate Unix uids and gids
+from the information passed back from the PDC when a user is
+authenticated, making a Samba server truly plug and play in an NT
+domain environment. Watch for this code soon.
+<p><br><em>NOTE:</em> Much of the text of this document was first published in the
+Web magazine <a href="http://www.linuxworld.com"><strong>"LinuxWorld"</strong></a> as the article <a href="http://www.linuxworld.com/linuxworld/lw-1998-10/lw-10-samba.html"><strong>"Doing the NIS/NT Samba"</strong></a>.
+</body>
+</html>