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authorJelmer Vernooij <jelmer@samba.org>2005-06-10 20:29:09 +0000
committerGerald W. Carter <jerry@samba.org>2008-04-23 08:46:44 -0500
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+<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE chapter PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
+<chapter id="rights">
+<chapterinfo>
+ &author.jerry;
+ &author.jht;
+</chapterinfo>
+
+<title>User Rights and Privileges</title>
+
+<para>
+The administration of Windows user, group and machine accounts in the Samba
+domain controlled network necessitates interfacing between the MS Windows
+networking environment and the UNIX operating system environment. The right
+(permission) to add machines to the Windows security domain can be assigned
+(set) to non-administrative users both in Windows NT4 domains as well as in
+Active Directory domains.
+</para>
+
+<para>
+The addition of Windows NT4/2kX/XPPro machines to the domain necessitates the
+creation of a machine account for each machine added. The machine account is
+a necessity that is used to validate that the machine can be trusted to permit
+user logons.
+</para>
+
+<para>
+Machine accounts are analogous to user accounts, and thus in implementing them
+on a UNIX machine that is hosting Samba (i.e.: On which Samba is running) it is
+necessary to create a special type of user account. Machine accounts differ from
+a normal user account in that the account name (login ID) is terminated with a $
+sign. An additional difference is that this type of account should not ever be able
+to log into the UNIX environment as a system user and therefore is set to have a
+shell of <command>/bin/false</command> and a home directory of
+<command>/dev/null.</command>
+</para>
+
+<para>
+The creation of UNIX system accounts has traditionally been the sole right of
+the system administrator, better known as the <constant>root</constant> account.
+It is possible in the UNIX environment to create multiple users who have the
+same UID. Any UNIX user who has a UID=0 is inherently the same as the
+<constant>root</constant> account.
+</para>
+
+<para>
+All versions of Samba call system interface scripts that permit CIFS function
+calls that are used to manage users, groups and machine accounts to be affected
+in the UNIX environment. All versions of Samba up to and including version 3.0.10
+required the use of a Windows Administrator account that unambiguously maps to
+the UNIX <constant>root</constant> account to permit the execution of these
+interface scripts. The reuqirement to do this has understandably met with some
+disdain and consternation among Samba administrators, particularly where it became
+necessary to permit people who should not posses <constant>root</constant> level
+access to the UNIX host system.
+</para>
+
+<sect1>
+<title>Rights Management Capabilities</title>
+
+<para>
+Samba 3.0.11 introduces support for the Windows privilege model. This model
+allows certain rights to be assigned to a user or group SID. In order to enable
+this feature, <smbconfoption name="enable privileges">yes</smbconfoption>
+must be defined in the <smbconfsection name="global"/> section of the &smb.conf; file.
+</para>
+
+<para>
+Currently, the rights supported in Samba 3 are listed in <link linkend="rp-privs"/>.
+The remainder of this chapter explains how to manage and use these privileges on Samba servers.
+</para>
+
+<table id="rp-privs">
+ <title>Current Privilege Capabilities</title>
+ <tgroup cols="2">
+ <colspec align="right"/>
+ <colspec align="left"/>
+ <thead>
+ <row>
+ <entry align="center">Privilege</entry>
+ <entry align="center">Description</entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry><para>SeMachineAccountPrivilege</para></entry>
+ <entry><para>Add machines to domain</para></entry>
+ </row>
+ <row>
+ <entry><para>SePrintOperatorPrivilege</para></entry>
+ <entry><para>Manage printers</para></entry>
+ </row>
+ <row>
+ <entry><para>SeAddUsersPrivilege</para></entry>
+ <entry><para>Add users and groups to the domain</para></entry>
+ </row>
+ <row>
+ <entry><para>SeRemoteShutdownPrivilege</para></entry>
+ <entry><para>Force shutdown from a remote system</para></entry>
+ </row>
+ <row>
+ <entry><para>SeDiskOperatorPrivilege</para></entry>
+ <entry><para>Manage disk share</para></entry>
+ </row>
+ </tbody>
+ </tgroup>
+</table>
+
+<sect2>
+<title>Using the <quote>net rpc rights</quote> Utility</title>
+
+<para>
+There are two primary means of managing the rights assigned to users and groups
+on a Samba server. The <command>NT4 User Manager for Domains</command> may be
+used from any Windows NT4, 2000 or XP Professional domain member client to
+connect to a Samba domain controller and view/modify the rights assignments.
+This application, however, appears to have bugs when run on a client running
+Windows 2000 or later, therefore Samba provides a command line utility for
+performing the necessary administrative actions.
+</para>
+
+<para>
+The <command>net rpc rights</command> utility in Samba 3.0.11 has 3 new subcommands:
+</para>
+
+<variablelist>
+ <varlistentry><term>list [name|accounts]</term>
+ <listitem><para>
+ When called with no arguments, <command>net rpc list</command>
+ will simply list the available rights on the server. When passed
+ a specific user or group name, the tool lists the privileges
+ currently assigned to the specified account. When invoked using
+ the special string <constant>accounts</constant>,
+ <command>net rpc rights list</command> will return a list of all
+ privileged accounts on the server and the assigned rights.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term>grant &lt;user&gt; &lt;right [right ...]&gt;</term>
+ <listitem><para>
+ When called with no arguments, This function is used to assign
+ a list of rights to a specified user or group. For example,
+ to grant the members of the Domain Admins group on a Samba DC
+ the capability to add client machines to the domain, one would run:
+<screen>
+&rootprompt; net -S server -U domadmin rpc rights grant \
+ 'DOMAIN\Domain Admins' SeMachineAccountPrivilege
+</screen>
+ More than one privilege can be assigned by specifying a
+ list of rights separated by spaces. The parameter 'Domain\Domain Admins'
+ must be quoted with single ticks or using double-quotes to prevent
+ the back-slash and the space from being interpreted by the system shell.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term>revoke &lt;user&gt; &lt;right [right ...]&gt;</term>
+ <listitem><para>
+ This command is similar in format to <command>net rpc rights grant</command>. It's
+ effect is to remove an assigned right (or list of rights) from a user or group.
+ </para></listitem>
+ </varlistentry>
+
+</variablelist>
+
+<note><para>
+You must be connected as a member of the Domain Admins group to be able to
+grant or revoke privileges assigned to an account. This capability is
+inherent to the Domain Admins group and is not configurable.
+</para></note>
+
+<para>
+By default, no privileges are initially assigned to any
+account. The reason for this is that certain actions will
+be performed as root once smbd determines that a user has
+the necessary rights. For example, when joining a client to
+a Windows domain, the 'add machine script' must be executed
+with superuser rights in most cases. For this reason, you
+should be very careful about handing out privileges to
+accounts.
+</para>
+
+<para>
+Access as the root user (UID=0) bypasses all privilege checks.
+</para>
+
+</sect2>
+
+<sect2>
+<title>Description of Privileges</title>
+
+<para>
+The privileges that have been implemented in Samba-3.0.11 are shown below.
+It is possible, and likely, that additional privileges may be implemented in
+later releases of Samba. It is also likely that any privileges currently implemented
+but not used may be removed from future releases, thus it is important that
+the successful as well as unsuccessful use of these facilities should be reported
+on the Samba mailing lists.
+</para>
+
+<variablelist>
+ <varlistentry><term>SeAddUsersPrivilege</term>
+ <listitem><para>
+ This right determines whether or not smbd will allow the
+ user to create new user or group accounts via such tools
+ as <command>net rpc user add</command> or
+ <command>NT4 User Manager for Domains.</command>
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term>SeDiskOperatorPrivilege</term>
+ <listitem><para>
+ Accounts which posses this right will be able to execute
+ scripts defined by the <command>add/delete/change</command>
+ share command in &smb.conf; file as root. Such users will
+ also be able to modify the ACL associated with file shares
+ on the Samba server.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term>SeMachineAccountPrivilege</term>
+ <listitem><para>
+ Controls whether or not the user is able join client
+ machines to a Samba controlled domain.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term>SePrintOperatorPrivilege</term>
+ <listitem><para>
+ This privilege operates identically to the
+ <smbconfoption name="printer admin"/>
+ option in the &smb.conf; file (see section 5 man page for &smb.conf;)
+ except that it is a global right (not on a per printer basis).
+ Eventually the smb.conf option will be deprecated and administrative
+ rights to printers will be controlled exclusively by this right and
+ the security descriptor associated with the printer object in the
+ <filename>ntprinters.tdb</filename> file.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term>SeRemoteShutdownPrivilege</term>
+ <listitem><para>
+ Samba provides two hooks for shutting down or rebooting
+ the server and for aborting a previously issued shutdown
+ command. Since this is an operation normally limited by
+ the operating system to the root user, an account must possess this
+ right to be able to execute either of these hooks to have any effect.
+ </para></listitem>
+ </varlistentry>
+
+</variablelist>
+
+</sect2>
+
+</sect1>
+
+<sect1>
+<title>The Administrator Domain SID</title>
+
+<para>
+Please note that when configured as a DC, it is now required
+that an account in the server's passdb backend be set to the
+domain SID of the default Administrator account. To obtain the
+domain SID on a Samba DC, run the following command:
+
+<screen>
+&rootprompt; net getlocalsid
+SID for domain FOO is: S-1-5-21-4294955119-3368514841-2087710299
+</screen>
+You may assign the Domain Administrator rid to an account using the <command>pdbedit</command>
+command as shown here:
+<screen>
+&rootprompt; pdbedit -U S-1-5-21-4294955119-3368514841-2087710299-500 -u root -r
+</screen>
+</para>
+
+</sect1>
+
+</chapter>