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<samba:parameter xmlns:samba="http://samba.org/common">
<term><anchor id="PASSWORDSERVER"/>password server (G)</term>
<listitem><para>By specifying the name of another SMB server (such
as a WinNT box) with this option, and using <command moreinfo="none">security = domain
</command> or <command moreinfo="none">security = server</command> you can get Samba
to do all its username/password validation via a remote server.</para>
<para>This option sets the name of the password server to use.
It must be a NetBIOS name, so if the machine's NetBIOS name is
different from its Internet name then you may have to add its NetBIOS
name to the lmhosts file which is stored in the same directory
as the <filename moreinfo="none">smb.conf</filename> file.</para>
<para>The name of the password server is looked up using the
parameter <link linkend="NAMERESOLVEORDER"><parameter moreinfo="none">name
resolve order</parameter></link> and so may resolved
by any method and order described in that parameter.</para>
<para>The password server must be a machine capable of using
the "LM1.2X002" or the "NT LM 0.12" protocol, and it must be in
user level security mode.</para>
<para><emphasis>NOTE:</emphasis> Using a password server
means your UNIX box (running Samba) is only as secure as your
password server. <emphasis>DO NOT CHOOSE A PASSWORD SERVER THAT
YOU DON'T COMPLETELY TRUST</emphasis>.</para>
<para>Never point a Samba server at itself for password
serving. This will cause a loop and could lock up your Samba
server!</para>
<para>The name of the password server takes the standard
substitutions, but probably the only useful one is <parameter moreinfo="none">%m
</parameter>, which means the Samba server will use the incoming
client as the password server. If you use this then you better
trust your clients, and you had better restrict them with hosts allow!</para>
<para>If the <parameter moreinfo="none">security</parameter> parameter is set to
<constant>domain</constant>, then the list of machines in this
option must be a list of Primary or Backup Domain controllers for the
Domain or the character '*', as the Samba server is effectively
in that domain, and will use cryptographically authenticated RPC calls
to authenticate the user logging on. The advantage of using <command moreinfo="none">
security = domain</command> is that if you list several hosts in the
<parameter moreinfo="none">password server</parameter> option then <command moreinfo="none">smbd
</command> will try each in turn till it finds one that responds. This
is useful in case your primary server goes down.</para>
<para>If the <parameter moreinfo="none">password server</parameter> option is set
to the character '*', then Samba will attempt to auto-locate the
Primary or Backup Domain controllers to authenticate against by
doing a query for the name <constant>WORKGROUP<1C></constant>
and then contacting each server returned in the list of IP
addresses from the name resolution source. </para>
<para>If the list of servers contains both names and the '*'
character, the list is treated as a list of preferred
domain controllers, but an auto lookup of all remaining DC's
will be added to the list as well. Samba will not attempt to optimize
this list by locating the closest DC.</para>
<para>If the <parameter moreinfo="none">security</parameter> parameter is
set to <constant>server</constant>, then there are different
restrictions that <command moreinfo="none">security = domain</command> doesn't
suffer from:</para>
<itemizedlist>
<listitem><para>You may list several password servers in
the <parameter moreinfo="none">password server</parameter> parameter, however if an
<command moreinfo="none">smbd</command> makes a connection to a password server,
and then the password server fails, no more users will be able
to be authenticated from this <command moreinfo="none">smbd</command>. This is a
restriction of the SMB/CIFS protocol when in <command moreinfo="none">security = server
</command> mode and cannot be fixed in Samba.</para></listitem>
<listitem><para>If you are using a Windows NT server as your
password server then you will have to ensure that your users
are able to login from the Samba server, as when in <command moreinfo="none">
security = server</command> mode the network logon will appear to
come from there rather than from the users workstation.</para></listitem>
</itemizedlist>
<para>See also the <link linkend="SECURITY"><parameter moreinfo="none">security
</parameter></link> parameter.</para>
<para>Default: <command moreinfo="none">password server = <empty string></command>
</para>
<para>Example: <command moreinfo="none">password server = NT-PDC, NT-BDC1, NT-BDC2, *
</command></para>
<para>Example: <command moreinfo="none">password server = *</command></para>
</listitem>
</samba:parameter>
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