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|
<HTML
><HEAD
><TITLE
>SAMBA Project Documentation</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.57"></HEAD
><BODY
CLASS="BOOK"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="BOOK"
><A
NAME="SAMBA-PROJECT-DOCUMENTATION"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="TITLE"
><A
NAME="SAMBA-PROJECT-DOCUMENTATION"
>SAMBA Project Documentation</A
></H1
><H3
CLASS="AUTHOR"
><A
NAME="AEN4"
>SAMBA Team</A
></H3
><HR></DIV
><HR><H1
><A
NAME="AEN8"
>Abstract</A
></H1
><P
><EM
>Last Update</EM
> : Tue Jul 31 15:58:03 CDT 2001</P
><P
>This book is a collection of HOWTOs added to Samba documentation over the years.
I try to ensure that all are current, but sometimes the is a larger job
than one person can maintain. The most recent version of this document
can be found at <A
HREF="http://www.samba.org/"
TARGET="_top"
>http://www.samba.org/</A
>
on the "Documentation" page. Please send updates to <A
HREF="mailto:jerry@samba.org"
TARGET="_top"
>jerry@samba.org</A
>.</P
><P
>Cheers, jerry</P
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>1. <A
HREF="#INSTALL"
>How to Install and Test SAMBA</A
></DT
><DD
><DL
><DT
>1.1. <A
HREF="#AEN18"
>Step 0: Read the man pages</A
></DT
><DT
>1.2. <A
HREF="#AEN26"
>Step 1: Building the Binaries</A
></DT
><DT
>1.3. <A
HREF="#AEN54"
>Step 2: The all important step</A
></DT
><DT
>1.4. <A
HREF="#AEN58"
>Step 3: Create the smb configuration file.</A
></DT
><DT
>1.5. <A
HREF="#AEN72"
>Step 4: Test your config file with
<B
CLASS="COMMAND"
>testparm</B
></A
></DT
><DT
>1.6. <A
HREF="#AEN78"
>Step 5: Starting the smbd and nmbd</A
></DT
><DD
><DL
><DT
>1.6.1. <A
HREF="#AEN88"
>Step 5a: Starting from inetd.conf</A
></DT
><DT
>1.6.2. <A
HREF="#AEN117"
>Step 5b. Alternative: starting it as a daemon</A
></DT
></DL
></DD
><DT
>1.7. <A
HREF="#AEN133"
>Step 6: Try listing the shares available on your
server</A
></DT
><DT
>1.8. <A
HREF="#AEN142"
>Step 7: Try connecting with the unix client</A
></DT
><DT
>1.9. <A
HREF="#AEN158"
>Step 8: Try connecting from a DOS, WfWg, Win9x, WinNT,
Win2k, OS/2, etc... client</A
></DT
><DT
>1.10. <A
HREF="#AEN172"
>What If Things Don't Work?</A
></DT
><DD
><DL
><DT
>1.10.1. <A
HREF="#AEN177"
>Diagnosing Problems</A
></DT
><DT
>1.10.2. <A
HREF="#AEN181"
>Scope IDs</A
></DT
><DT
>1.10.3. <A
HREF="#AEN184"
>Choosing the Protocol Level</A
></DT
><DT
>1.10.4. <A
HREF="#AEN193"
>Printing from UNIX to a Client PC</A
></DT
><DT
>1.10.5. <A
HREF="#AEN197"
>Locking</A
></DT
><DT
>1.10.6. <A
HREF="#AEN207"
>Mapping Usernames</A
></DT
><DT
>1.10.7. <A
HREF="#AEN210"
>Other Character Sets</A
></DT
></DL
></DD
></DL
></DD
><DT
>2. <A
HREF="#INTEGRATE-MS-NETWORKS"
>Integrating MS Windows networks with Samba</A
></DT
><DD
><DL
><DT
>2.1. <A
HREF="#AEN224"
>Agenda</A
></DT
><DT
>2.2. <A
HREF="#AEN246"
>Name Resolution in a pure Unix/Linux world</A
></DT
><DD
><DL
><DT
>2.2.1. <A
HREF="#AEN262"
><TT
CLASS="FILENAME"
>/etc/hosts</TT
></A
></DT
><DT
>2.2.2. <A
HREF="#AEN278"
><TT
CLASS="FILENAME"
>/etc/resolv.conf</TT
></A
></DT
><DT
>2.2.3. <A
HREF="#AEN289"
><TT
CLASS="FILENAME"
>/etc/host.conf</TT
></A
></DT
><DT
>2.2.4. <A
HREF="#AEN297"
><TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
></A
></DT
></DL
></DD
><DT
>2.3. <A
HREF="#AEN309"
>Name resolution as used within MS Windows networking</A
></DT
><DD
><DL
><DT
>2.3.1. <A
HREF="#AEN321"
>The NetBIOS Name Cache</A
></DT
><DT
>2.3.2. <A
HREF="#AEN326"
>The LMHOSTS file</A
></DT
><DT
>2.3.3. <A
HREF="#AEN334"
>HOSTS file</A
></DT
><DT
>2.3.4. <A
HREF="#AEN339"
>DNS Lookup</A
></DT
><DT
>2.3.5. <A
HREF="#AEN342"
>WINS Lookup</A
></DT
></DL
></DD
><DT
>2.4. <A
HREF="#AEN354"
>How browsing functions and how to deploy stable and
dependable browsing using Samba</A
></DT
><DT
>2.5. <A
HREF="#AEN364"
>MS Windows security options and how to configure
Samba for seemless integration</A
></DT
><DD
><DL
><DT
>2.5.1. <A
HREF="#AEN392"
>Use MS Windows NT as an authentication server</A
></DT
><DT
>2.5.2. <A
HREF="#AEN400"
>Make Samba a member of an MS Windows NT security domain</A
></DT
><DT
>2.5.3. <A
HREF="#AEN417"
>Configure Samba as an authentication server</A
></DT
><DD
><DL
><DT
>2.5.3.1. <A
HREF="#AEN424"
>Users</A
></DT
><DT
>2.5.3.2. <A
HREF="#AEN429"
>MS Windows NT Machine Accounts</A
></DT
></DL
></DD
></DL
></DD
><DT
>2.6. <A
HREF="#AEN434"
>Conclusions</A
></DT
></DL
></DD
><DT
>3. <A
HREF="#PAM"
>Configuring PAM for distributed but centrally
managed authentication</A
></DT
><DD
><DL
><DT
>3.1. <A
HREF="#AEN455"
>Samba and PAM</A
></DT
><DT
>3.2. <A
HREF="#AEN499"
>Distributed Authentication</A
></DT
><DT
>3.3. <A
HREF="#AEN506"
>PAM Configuration in smb.conf</A
></DT
></DL
></DD
><DT
>4. <A
HREF="#MSDFS"
>Hosting a Microsoft Distributed File System tree on Samba</A
></DT
><DD
><DL
><DT
>4.1. <A
HREF="#AEN526"
>Instructions</A
></DT
><DD
><DL
><DT
>4.1.1. <A
HREF="#AEN561"
>Notes</A
></DT
></DL
></DD
></DL
></DD
><DT
>5. <A
HREF="#UNIX-PERMISSIONS"
>UNIX Permission Bits and Windows NT Access Control Lists</A
></DT
><DD
><DL
><DT
>5.1. <A
HREF="#AEN581"
>Viewing and changing UNIX permissions using the NT
security dialogs</A
></DT
><DT
>5.2. <A
HREF="#AEN590"
>How to view file security on a Samba share</A
></DT
><DT
>5.3. <A
HREF="#AEN601"
>Viewing file ownership</A
></DT
><DT
>5.4. <A
HREF="#AEN621"
>Viewing file or directory permissions</A
></DT
><DD
><DL
><DT
>5.4.1. <A
HREF="#AEN636"
>File Permissions</A
></DT
><DT
>5.4.2. <A
HREF="#AEN650"
>Directory Permissions</A
></DT
></DL
></DD
><DT
>5.5. <A
HREF="#AEN657"
>Modifying file or directory permissions</A
></DT
><DT
>5.6. <A
HREF="#AEN679"
>Interaction with the standard Samba create mask
parameters</A
></DT
><DT
>5.7. <A
HREF="#AEN743"
>Interaction with the standard Samba file attribute
mapping</A
></DT
></DL
></DD
><DT
>6. <A
HREF="#PRINTING"
>Printing Support in Samba 2.2.x</A
></DT
><DD
><DL
><DT
>6.1. <A
HREF="#AEN764"
>Introduction</A
></DT
><DT
>6.2. <A
HREF="#AEN786"
>Configuration</A
></DT
><DD
><DL
><DT
>6.2.1. <A
HREF="#AEN797"
>Creating [print$]</A
></DT
><DT
>6.2.2. <A
HREF="#AEN832"
>Setting Drivers for Existing Printers</A
></DT
><DT
>6.2.3. <A
HREF="#AEN849"
>Support a large number of printers</A
></DT
><DT
>6.2.4. <A
HREF="#AEN860"
>Adding New Printers via the Windows NT APW</A
></DT
><DT
>6.2.5. <A
HREF="#AEN885"
>Samba and Printer Ports</A
></DT
></DL
></DD
><DT
>6.3. <A
HREF="#AEN893"
>The Imprints Toolset</A
></DT
><DD
><DL
><DT
>6.3.1. <A
HREF="#AEN897"
>What is Imprints?</A
></DT
><DT
>6.3.2. <A
HREF="#AEN907"
>Creating Printer Driver Packages</A
></DT
><DT
>6.3.3. <A
HREF="#AEN910"
>The Imprints server</A
></DT
><DT
>6.3.4. <A
HREF="#AEN914"
>The Installation Client</A
></DT
></DL
></DD
><DT
>6.4. <A
HREF="#AEN936"
><A
NAME="MIGRATION"
></A
>Migration to from Samba 2.0.x to 2.2.x</A
></DT
></DL
></DD
><DT
>7. <A
HREF="#DOMAIN-SECURITY"
>security = domain in Samba 2.x</A
></DT
><DD
><DL
><DT
>7.1. <A
HREF="#AEN990"
>Joining an NT Domain with Samba 2.2</A
></DT
><DT
>7.2. <A
HREF="#AEN1054"
>Samba and Windows 2000 Domains</A
></DT
><DT
>7.3. <A
HREF="#AEN1059"
>Why is this better than security = server?</A
></DT
></DL
></DD
><DT
>8. <A
HREF="#SAMBA-PDC"
>How to Configure Samba 2.2 as a Primary Domain Controller</A
></DT
><DD
><DL
><DT
>8.1. <A
HREF="#AEN1092"
>Prerequisite Reading</A
></DT
><DT
>8.2. <A
HREF="#AEN1098"
>Background</A
></DT
><DT
>8.3. <A
HREF="#AEN1137"
>Configuring the Samba Domain Controller</A
></DT
><DT
>8.4. <A
HREF="#AEN1180"
>Creating Machine Trust Accounts and Joining Clients to the
Domain</A
></DT
><DD
><DL
><DT
>8.4.1. <A
HREF="#AEN1199"
>Manual Creation of Machine Trust Accounts</A
></DT
><DT
>8.4.2. <A
HREF="#AEN1234"
>"On-the-Fly" Creation of Machine Trust Accounts</A
></DT
><DT
>8.4.3. <A
HREF="#AEN1243"
>Joining the Client to the Domain</A
></DT
></DL
></DD
><DT
>8.5. <A
HREF="#AEN1258"
>Common Problems and Errors</A
></DT
><DT
>8.6. <A
HREF="#AEN1306"
>System Policies and Profiles</A
></DT
><DT
>8.7. <A
HREF="#AEN1350"
>What other help can I get?</A
></DT
><DT
>8.8. <A
HREF="#AEN1464"
>Domain Control for Windows 9x/ME</A
></DT
><DD
><DL
><DT
>8.8.1. <A
HREF="#AEN1490"
>Configuration Instructions: Network Logons</A
></DT
><DT
>8.8.2. <A
HREF="#AEN1509"
>Configuration Instructions: Setting up Roaming User Profiles</A
></DT
><DD
><DL
><DT
>8.8.2.1. <A
HREF="#AEN1517"
>Windows NT Configuration</A
></DT
><DT
>8.8.2.2. <A
HREF="#AEN1525"
>Windows 9X Configuration</A
></DT
><DT
>8.8.2.3. <A
HREF="#AEN1533"
>Win9X and WinNT Configuration</A
></DT
><DT
>8.8.2.4. <A
HREF="#AEN1540"
>Windows 9X Profile Setup</A
></DT
><DT
>8.8.2.5. <A
HREF="#AEN1576"
>Windows NT Workstation 4.0</A
></DT
><DT
>8.8.2.6. <A
HREF="#AEN1589"
>Windows NT Server</A
></DT
><DT
>8.8.2.7. <A
HREF="#AEN1592"
>Sharing Profiles between W95 and NT Workstation 4.0</A
></DT
></DL
></DD
></DL
></DD
><DT
>8.9. <A
HREF="#AEN1602"
>DOMAIN_CONTROL.txt : Windows NT Domain Control & Samba</A
></DT
></DL
></DD
><DT
>9. <A
HREF="#WINBIND"
>Unified Logons between Windows NT and UNIX using Winbind</A
></DT
><DD
><DL
><DT
>9.1. <A
HREF="#AEN1652"
>Abstract</A
></DT
><DT
>9.2. <A
HREF="#AEN1656"
>Introduction</A
></DT
><DT
>9.3. <A
HREF="#AEN1669"
>What Winbind Provides</A
></DT
><DD
><DL
><DT
>9.3.1. <A
HREF="#AEN1676"
>Target Uses</A
></DT
></DL
></DD
><DT
>9.4. <A
HREF="#AEN1680"
>How Winbind Works</A
></DT
><DD
><DL
><DT
>9.4.1. <A
HREF="#AEN1685"
>Microsoft Remote Procedure Calls</A
></DT
><DT
>9.4.2. <A
HREF="#AEN1689"
>Name Service Switch</A
></DT
><DT
>9.4.3. <A
HREF="#AEN1705"
>Pluggable Authentication Modules</A
></DT
><DT
>9.4.4. <A
HREF="#AEN1713"
>User and Group ID Allocation</A
></DT
><DT
>9.4.5. <A
HREF="#AEN1717"
>Result Caching</A
></DT
></DL
></DD
><DT
>9.5. <A
HREF="#AEN1720"
>Installation and Configuration</A
></DT
><DD
><DL
><DT
>9.5.1. <A
HREF="#AEN1725"
>Introduction</A
></DT
><DT
>9.5.2. <A
HREF="#AEN1738"
>Requirements</A
></DT
><DT
>9.5.3. <A
HREF="#AEN1752"
>Testing Things Out</A
></DT
><DD
><DL
><DT
>9.5.3.1. <A
HREF="#AEN1763"
>Configure and compile SAMBA</A
></DT
><DT
>9.5.3.2. <A
HREF="#AEN1782"
>Configure <TT
CLASS="FILENAME"
>nsswitch.conf</TT
> and the
winbind libraries</A
></DT
><DT
>9.5.3.3. <A
HREF="#AEN1807"
>Configure smb.conf</A
></DT
><DT
>9.5.3.4. <A
HREF="#AEN1823"
>Join the SAMBA server to the PDC domain</A
></DT
><DT
>9.5.3.5. <A
HREF="#AEN1834"
>Start up the winbindd daemon and test it!</A
></DT
><DT
>9.5.3.6. <A
HREF="#AEN1870"
>Fix the <TT
CLASS="FILENAME"
>/etc/rc.d/init.d/smb</TT
> startup files</A
></DT
><DT
>9.5.3.7. <A
HREF="#AEN1892"
>Configure Winbind and PAM</A
></DT
></DL
></DD
></DL
></DD
><DT
>9.6. <A
HREF="#AEN1939"
>Limitations</A
></DT
><DT
>9.7. <A
HREF="#AEN1949"
>Conclusion</A
></DT
></DL
></DD
><DT
>10. <A
HREF="#OS2"
>OS2 Client HOWTO</A
></DT
><DD
><DL
><DT
>10.1. <A
HREF="#AEN1963"
>FAQs</A
></DT
><DD
><DL
><DT
>10.1.1. <A
HREF="#AEN1965"
>How can I configure OS/2 Warp Connect or
OS/2 Warp 4 as a client for Samba?</A
></DT
><DT
>10.1.2. <A
HREF="#AEN1980"
>How can I configure OS/2 Warp 3 (not Connect),
OS/2 1.2, 1.3 or 2.x for Samba?</A
></DT
><DT
>10.1.3. <A
HREF="#AEN1989"
>Are there any other issues when OS/2 (any version)
is used as a client?</A
></DT
><DT
>10.1.4. <A
HREF="#AEN1993"
>How do I get printer driver download working
for OS/2 clients?</A
></DT
></DL
></DD
></DL
></DD
><DT
>11. <A
HREF="#CVS-ACCESS"
>HOWTO Access Samba source code via CVS</A
></DT
><DD
><DL
><DT
>11.1. <A
HREF="#AEN2009"
>Introduction</A
></DT
><DT
>11.2. <A
HREF="#AEN2014"
>CVS Access to samba.org</A
></DT
><DD
><DL
><DT
>11.2.1. <A
HREF="#AEN2017"
>Access via CVSweb</A
></DT
><DT
>11.2.2. <A
HREF="#AEN2022"
>Access via cvs</A
></DT
></DL
></DD
></DL
></DD
><DT
><A
HREF="#AEN2050"
>Index</A
></DT
></DL
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="INSTALL"
>Chapter 1. How to Install and Test SAMBA</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN18"
>1.1. Step 0: Read the man pages</A
></H1
><P
>The man pages distributed with SAMBA contain
lots of useful info that will help to get you started.
If you don't know how to read man pages then try
something like:</P
><P
><TT
CLASS="PROMPT"
>$ </TT
><TT
CLASS="USERINPUT"
><B
>nroff -man smbd.8 | more
</B
></TT
></P
><P
>Other sources of information are pointed to
by the Samba web site,<A
HREF="http://www.samba.org/"
TARGET="_top"
> http://www.samba.org</A
></P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN26"
>1.2. Step 1: Building the Binaries</A
></H1
><P
>To do this, first run the program <B
CLASS="COMMAND"
>./configure
</B
> in the source directory. This should automatically
configure Samba for your operating system. If you have unusual
needs then you may wish to run</P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>./configure --help
</B
></TT
></P
><P
>first to see what special options you can enable.
Then executing</P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>make</B
></TT
></P
><P
>will create the binaries. Once it's successfully
compiled you can use </P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>make install</B
></TT
></P
><P
>to install the binaries and manual pages. You can
separately install the binaries and/or man pages using</P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>make installbin
</B
></TT
></P
><P
>and</P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>make installman
</B
></TT
></P
><P
>Note that if you are upgrading for a previous version
of Samba you might like to know that the old versions of
the binaries will be renamed with a ".old" extension. You
can go back to the previous version with</P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>make revert
</B
></TT
></P
><P
>if you find this version a disaster!</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN54"
>1.3. Step 2: The all important step</A
></H1
><P
>At this stage you must fetch yourself a
coffee or other drink you find stimulating. Getting the rest
of the install right can sometimes be tricky, so you will
probably need it.</P
><P
>If you have installed samba before then you can skip
this step.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN58"
>1.4. Step 3: Create the smb configuration file.</A
></H1
><P
>There are sample configuration files in the examples
subdirectory in the distribution. I suggest you read them
carefully so you can see how the options go together in
practice. See the man page for all the options.</P
><P
>The simplest useful configuration file would be
something like this:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> [global]
workgroup = MYGROUP
[homes]
guest ok = no
read only = no
</PRE
></TD
></TR
></TABLE
></P
><P
>which would allow connections by anyone with an
account on the server, using either their login name or
"homes" as the service name. (Note that I also set the
workgroup that Samba is part of. See BROWSING.txt for details)</P
><P
>Note that <B
CLASS="COMMAND"
>make install</B
> will not install
a <TT
CLASS="FILENAME"
>smb.conf</TT
> file. You need to create it
yourself. </P
><P
>Make sure you put the smb.conf file in the same place
you specified in the<TT
CLASS="FILENAME"
>Makefile</TT
> (the default is to
look for it in <TT
CLASS="FILENAME"
>/usr/local/samba/lib/</TT
>).</P
><P
>For more information about security settings for the
[homes] share please refer to the document UNIX_SECURITY.txt.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN72"
>1.5. Step 4: Test your config file with
<B
CLASS="COMMAND"
>testparm</B
></A
></H1
><P
>It's important that you test the validity of your
<TT
CLASS="FILENAME"
>smb.conf</TT
> file using the testparm program.
If testparm runs OK then it will list the loaded services. If
not it will give an error message.</P
><P
>Make sure it runs OK and that the services look
reasonable before proceeding. </P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN78"
>1.6. Step 5: Starting the smbd and nmbd</A
></H1
><P
>You must choose to start smbd and nmbd either
as daemons or from <B
CLASS="COMMAND"
>inetd</B
>. Don't try
to do both! Either you can put them in <TT
CLASS="FILENAME"
> inetd.conf</TT
> and have them started on demand
by <B
CLASS="COMMAND"
>inetd</B
>, or you can start them as
daemons either from the command line or in <TT
CLASS="FILENAME"
> /etc/rc.local</TT
>. See the man pages for details
on the command line options. Take particular care to read
the bit about what user you need to be in order to start
Samba. In many cases you must be root.</P
><P
>The main advantage of starting <B
CLASS="COMMAND"
>smbd</B
>
and <B
CLASS="COMMAND"
>nmbd</B
> using the recommended daemon method
is that they will respond slightly more quickly to an initial connection
request.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN88"
>1.6.1. Step 5a: Starting from inetd.conf</A
></H2
><P
>NOTE; The following will be different if
you use NIS or NIS+ to distributed services maps.</P
><P
>Look at your <TT
CLASS="FILENAME"
>/etc/services</TT
>.
What is defined at port 139/tcp. If nothing is defined
then add a line like this:</P
><P
><TT
CLASS="USERINPUT"
><B
>netbios-ssn 139/tcp</B
></TT
></P
><P
>similarly for 137/udp you should have an entry like:</P
><P
><TT
CLASS="USERINPUT"
><B
>netbios-ns 137/udp</B
></TT
></P
><P
>Next edit your <TT
CLASS="FILENAME"
>/etc/inetd.conf</TT
>
and add two lines something like this:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> netbios-ssn stream tcp nowait root /usr/local/samba/bin/smbd smbd
netbios-ns dgram udp wait root /usr/local/samba/bin/nmbd nmbd
</PRE
></TD
></TR
></TABLE
></P
><P
>The exact syntax of <TT
CLASS="FILENAME"
>/etc/inetd.conf</TT
>
varies between unixes. Look at the other entries in inetd.conf
for a guide.</P
><P
>NOTE: Some unixes already have entries like netbios_ns
(note the underscore) in <TT
CLASS="FILENAME"
>/etc/services</TT
>.
You must either edit <TT
CLASS="FILENAME"
>/etc/services</TT
> or
<TT
CLASS="FILENAME"
>/etc/inetd.conf</TT
> to make them consistent.</P
><P
>NOTE: On many systems you may need to use the
"interfaces" option in smb.conf to specify the IP address
and netmask of your interfaces. Run <B
CLASS="COMMAND"
>ifconfig</B
>
as root if you don't know what the broadcast is for your
net. <B
CLASS="COMMAND"
>nmbd</B
> tries to determine it at run
time, but fails on some unixes. See the section on "testing nmbd"
for a method of finding if you need to do this.</P
><P
>!!!WARNING!!! Many unixes only accept around 5
parameters on the command line in <TT
CLASS="FILENAME"
>inetd.conf</TT
>.
This means you shouldn't use spaces between the options and
arguments, or you should use a script, and start the script
from <B
CLASS="COMMAND"
>inetd</B
>.</P
><P
>Restart <B
CLASS="COMMAND"
>inetd</B
>, perhaps just send
it a HUP. If you have installed an earlier version of <B
CLASS="COMMAND"
> nmbd</B
> then you may need to kill nmbd as well.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN117"
>1.6.2. Step 5b. Alternative: starting it as a daemon</A
></H2
><P
>To start the server as a daemon you should create
a script something like this one, perhaps calling
it <TT
CLASS="FILENAME"
>startsmb</TT
>.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> #!/bin/sh
/usr/local/samba/bin/smbd -D
/usr/local/samba/bin/nmbd -D
</PRE
></TD
></TR
></TABLE
></P
><P
>then make it executable with <B
CLASS="COMMAND"
>chmod
+x startsmb</B
></P
><P
>You can then run <B
CLASS="COMMAND"
>startsmb</B
> by
hand or execute it from <TT
CLASS="FILENAME"
>/etc/rc.local</TT
>
</P
><P
>To kill it send a kill signal to the processes
<B
CLASS="COMMAND"
>nmbd</B
> and <B
CLASS="COMMAND"
>smbd</B
>.</P
><P
>NOTE: If you use the SVR4 style init system then
you may like to look at the <TT
CLASS="FILENAME"
>examples/svr4-startup</TT
>
script to make Samba fit into that system.</P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN133"
>1.7. Step 6: Try listing the shares available on your
server</A
></H1
><P
><TT
CLASS="PROMPT"
>$ </TT
><TT
CLASS="USERINPUT"
><B
>smbclient -L
<TT
CLASS="REPLACEABLE"
><I
>yourhostname</I
></TT
></B
></TT
></P
><P
>Your should get back a list of shares available on
your server. If you don't then something is incorrectly setup.
Note that this method can also be used to see what shares
are available on other LanManager clients (such as WfWg).</P
><P
>If you choose user level security then you may find
that Samba requests a password before it will list the shares.
See the <B
CLASS="COMMAND"
>smbclient</B
> man page for details. (you
can force it to list the shares without a password by
adding the option -U% to the command line. This will not work
with non-Samba servers)</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN142"
>1.8. Step 7: Try connecting with the unix client</A
></H1
><P
><TT
CLASS="PROMPT"
>$ </TT
><TT
CLASS="USERINPUT"
><B
>smbclient <TT
CLASS="REPLACEABLE"
><I
> //yourhostname/aservice</I
></TT
></B
></TT
></P
><P
>Typically the <TT
CLASS="REPLACEABLE"
><I
>yourhostname</I
></TT
>
would be the name of the host where you installed <B
CLASS="COMMAND"
> smbd</B
>. The <TT
CLASS="REPLACEABLE"
><I
>aservice</I
></TT
> is
any service you have defined in the <TT
CLASS="FILENAME"
>smb.conf</TT
>
file. Try your user name if you just have a [homes] section
in <TT
CLASS="FILENAME"
>smb.conf</TT
>.</P
><P
>For example if your unix host is bambi and your login
name is fred you would type:</P
><P
><TT
CLASS="PROMPT"
>$ </TT
><TT
CLASS="USERINPUT"
><B
>smbclient //bambi/fred
</B
></TT
></P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN158"
>1.9. Step 8: Try connecting from a DOS, WfWg, Win9x, WinNT,
Win2k, OS/2, etc... client</A
></H1
><P
>Try mounting disks. eg:</P
><P
><TT
CLASS="PROMPT"
>C:\WINDOWS\> </TT
><TT
CLASS="USERINPUT"
><B
>net use d: \\servername\service
</B
></TT
></P
><P
>Try printing. eg:</P
><P
><TT
CLASS="PROMPT"
>C:\WINDOWS\> </TT
><TT
CLASS="USERINPUT"
><B
>net use lpt1:
\\servername\spoolservice</B
></TT
></P
><P
><TT
CLASS="PROMPT"
>C:\WINDOWS\> </TT
><TT
CLASS="USERINPUT"
><B
>print filename
</B
></TT
></P
><P
>Celebrate, or send me a bug report!</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN172"
>1.10. What If Things Don't Work?</A
></H1
><P
>If nothing works and you start to think "who wrote
this pile of trash" then I suggest you do step 2 again (and
again) till you calm down.</P
><P
>Then you might read the file DIAGNOSIS.txt and the
FAQ. If you are still stuck then try the mailing list or
newsgroup (look in the README for details). Samba has been
successfully installed at thousands of sites worldwide, so maybe
someone else has hit your problem and has overcome it. You could
also use the WWW site to scan back issues of the samba-digest.</P
><P
>When you fix the problem PLEASE send me some updates to the
documentation (or source code) so that the next person will find it
easier. </P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN177"
>1.10.1. Diagnosing Problems</A
></H2
><P
>If you have installation problems then go to
<TT
CLASS="FILENAME"
>DIAGNOSIS.txt</TT
> to try to find the
problem.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN181"
>1.10.2. Scope IDs</A
></H2
><P
>By default Samba uses a blank scope ID. This means
all your windows boxes must also have a blank scope ID.
If you really want to use a non-blank scope ID then you will
need to use the -i <scope> option to nmbd, smbd, and
smbclient. All your PCs will need to have the same setting for
this to work. I do not recommend scope IDs.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN184"
>1.10.3. Choosing the Protocol Level</A
></H2
><P
>The SMB protocol has many dialects. Currently
Samba supports 5, called CORE, COREPLUS, LANMAN1,
LANMAN2 and NT1.</P
><P
>You can choose what maximum protocol to support
in the <TT
CLASS="FILENAME"
>smb.conf</TT
> file. The default is
NT1 and that is the best for the vast majority of sites.</P
><P
>In older versions of Samba you may have found it
necessary to use COREPLUS. The limitations that led to
this have mostly been fixed. It is now less likely that you
will want to use less than LANMAN1. The only remaining advantage
of COREPLUS is that for some obscure reason WfWg preserves
the case of passwords in this protocol, whereas under LANMAN1,
LANMAN2 or NT1 it uppercases all passwords before sending them,
forcing you to use the "password level=" option in some cases.</P
><P
>The main advantage of LANMAN2 and NT1 is support for
long filenames with some clients (eg: smbclient, Windows NT
or Win95). </P
><P
>See the smb.conf(5) manual page for more details.</P
><P
>Note: To support print queue reporting you may find
that you have to use TCP/IP as the default protocol under
WfWg. For some reason if you leave Netbeui as the default
it may break the print queue reporting on some systems.
It is presumably a WfWg bug.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN193"
>1.10.4. Printing from UNIX to a Client PC</A
></H2
><P
>To use a printer that is available via a smb-based
server from a unix host you will need to compile the
smbclient program. You then need to install the script
"smbprint". Read the instruction in smbprint for more details.
</P
><P
>There is also a SYSV style script that does much
the same thing called smbprint.sysv. It contains instructions.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN197"
>1.10.5. Locking</A
></H2
><P
>One area which sometimes causes trouble is locking.</P
><P
>There are two types of locking which need to be
performed by a SMB server. The first is "record locking"
which allows a client to lock a range of bytes in a open file.
The second is the "deny modes" that are specified when a file
is open.</P
><P
>Record locking semantics under Unix is very
different from record locking under Windows. Versions
of Samba before 2.2 have tried to use the native
fcntl() unix system call to implement proper record
locking between different Samba clients. This can not
be fully correct due to several reasons. The simplest
is the fact that a Windows client is allowed to lock a
byte range up to 2^32 or 2^64, depending on the client
OS. The unix locking only supports byte ranges up to
2^31. So it is not possible to correctly satisfy a
lock request above 2^31. There are many more
differences, too many to be listed here.</P
><P
>Samba 2.2 and above implements record locking
completely independent of the underlying unix
system. If a byte range lock that the client requests
happens to fall into the range 0-2^31, Samba hands
this request down to the Unix system. All other locks
can not be seen by unix anyway.</P
><P
>Strictly a SMB server should check for locks before
every read and write call on a file. Unfortunately with the
way fcntl() works this can be slow and may overstress the
rpc.lockd. It is also almost always unnecessary as clients
are supposed to independently make locking calls before reads
and writes anyway if locking is important to them. By default
Samba only makes locking calls when explicitly asked
to by a client, but if you set "strict locking = yes" then it will
make lock checking calls on every read and write. </P
><P
>You can also disable by range locking completely
using "locking = no". This is useful for those shares that
don't support locking or don't need it (such as cdroms). In
this case Samba fakes the return codes of locking calls to
tell clients that everything is OK.</P
><P
>The second class of locking is the "deny modes". These
are set by an application when it opens a file to determine
what types of access should be allowed simultaneously with
its open. A client may ask for DENY_NONE, DENY_READ, DENY_WRITE
or DENY_ALL. There are also special compatibility modes called
DENY_FCB and DENY_DOS.</P
><P
>You can disable share modes using "share modes = no".
This may be useful on a heavily loaded server as the share
modes code is very slow. See also the FAST_SHARE_MODES
option in the Makefile for a way to do full share modes
very fast using shared memory (if your OS supports it).</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN207"
>1.10.6. Mapping Usernames</A
></H2
><P
>If you have different usernames on the PCs and
the unix server then take a look at the "username map" option.
See the smb.conf man page for details.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN210"
>1.10.7. Other Character Sets</A
></H2
><P
>If you have problems using filenames with accented
characters in them (like the German, French or Scandinavian
character sets) then I recommend you look at the "valid chars"
option in smb.conf and also take a look at the validchars
package in the examples directory.</P
></DIV
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="INTEGRATE-MS-NETWORKS"
>Chapter 2. Integrating MS Windows networks with Samba</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN224"
>2.1. Agenda</A
></H1
><P
>To identify the key functional mechanisms of MS Windows networking
to enable the deployment of Samba as a means of extending and/or
replacing MS Windows NT/2000 technology.</P
><P
>We will examine:</P
><P
></P
><OL
TYPE="1"
><LI
><P
>Name resolution in a pure Unix/Linux TCP/IP
environment
</P
></LI
><LI
><P
>Name resolution as used within MS Windows
networking
</P
></LI
><LI
><P
>How browsing functions and how to deploy stable
and dependable browsing using Samba
</P
></LI
><LI
><P
>MS Windows security options and how to
configure Samba for seemless integration
</P
></LI
><LI
><P
>Configuration of Samba as:</P
><P
></P
><OL
TYPE="a"
><LI
><P
>A stand-alone server</P
></LI
><LI
><P
>An MS Windows NT 3.x/4.0 security domain member
</P
></LI
><LI
><P
>An alternative to an MS Windows NT 3.x/4.0 Domain Controller
</P
></LI
></OL
></LI
></OL
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN246"
>2.2. Name Resolution in a pure Unix/Linux world</A
></H1
><P
>The key configuration files covered in this section are:</P
><P
></P
><UL
><LI
><P
><TT
CLASS="FILENAME"
>/etc/hosts</TT
></P
></LI
><LI
><P
><TT
CLASS="FILENAME"
>/etc/resolv.conf</TT
></P
></LI
><LI
><P
><TT
CLASS="FILENAME"
>/etc/host.conf</TT
></P
></LI
><LI
><P
><TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
></P
></LI
></UL
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN262"
>2.2.1. <TT
CLASS="FILENAME"
>/etc/hosts</TT
></A
></H2
><P
>Contains a static list of IP Addresses and names.
eg:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> 127.0.0.1 localhost localhost.localdomain
192.168.1.1 bigbox.caldera.com bigbox alias4box</PRE
></TD
></TR
></TABLE
></P
><P
>The purpose of <TT
CLASS="FILENAME"
>/etc/hosts</TT
> is to provide a
name resolution mechanism so that uses do not need to remember
IP addresses.</P
><P
>Network packets that are sent over the physical network transport
layer communicate not via IP addresses but rather using the Media
Access Control address, or MAC address. IP Addresses are currently
32 bits in length and are typically presented as four (4) decimal
numbers that are separated by a dot (or period). eg: 168.192.1.1</P
><P
>MAC Addresses use 48 bits (or 6 bytes) and are typically represented
as two digit hexadecimal numbers separated by colons. eg:
40:8e:0a:12:34:56</P
><P
>Every network interfrace must have an MAC address. Associated with
a MAC address there may be one or more IP addresses. There is NO
relationship between an IP address and a MAC address, all such assignments
are arbitary or discretionary in nature. At the most basic level all
network communications takes place using MAC addressing. Since MAC
addresses must be globally unique, and generally remains fixed for
any particular interface, the assignment of an IP address makes sense
from a network management perspective. More than one IP address can
be assigned per MAC address. One address must be the primary IP address,
this is the address that will be returned in the ARP reply.</P
><P
>When a user or a process wants to communicate with another machine
the protocol implementation ensures that the "machine name" or "host
name" is resolved to an IP address in a manner that is controlled
by the TCP/IP configuration control files. The file
<TT
CLASS="FILENAME"
>/etc/hosts</TT
> is one such file.</P
><P
>When the IP address of the destination interface has been
determined a protocol called ARP/RARP isused to identify
the MAC address of the target interface. ARP stands for Address
Resolution Protocol, and is a broadcast oriented method that
uses UDP (User Datagram Protocol) to send a request to all
interfaces on the local network segment using the all 1's MAC
address. Network interfaces are programmed to respond to two
MAC addresses only; their own unique address and the address
ff:ff:ff:ff:ff:ff. The reply packet from an ARP request will
contain the MAC address and the primary IP address for each
interface.</P
><P
>The <TT
CLASS="FILENAME"
>/etc/hosts</TT
> file is foundational to all
Unix/Linux TCP/IP installations and as a minumum will contain
the localhost and local network interface IP addresses and the
primary names by which they are known within the local machine.
This file helps to prime the pump so that a basic level of name
resolution can exist before any other method of name resolution
becomes available.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN278"
>2.2.2. <TT
CLASS="FILENAME"
>/etc/resolv.conf</TT
></A
></H2
><P
>This file tells the name resolution libraries:</P
><P
></P
><UL
><LI
><P
>The name of the domain to which the machine
belongs
</P
></LI
><LI
><P
>The name(s) of any domains that should be
automatically searched when trying to resolve unqualified
host names to their IP address
</P
></LI
><LI
><P
>The name or IP address of available Domain
Name Servers that may be asked to perform name to address
translation lookups
</P
></LI
></UL
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN289"
>2.2.3. <TT
CLASS="FILENAME"
>/etc/host.conf</TT
></A
></H2
><P
><TT
CLASS="FILENAME"
>/etc/host.conf</TT
> is the primary means by
which the setting in /etc/resolv.conf may be affected. It is a
critical configuration file. This file controls the order by
which name resolution may procede. The typical structure is:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> order hosts,bind
multi on</PRE
></TD
></TR
></TABLE
></P
><P
>then both addresses should be returned. Please refer to the
man page for host.conf for further details.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN297"
>2.2.4. <TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
></A
></H2
><P
>This file controls the actual name resolution targets. The
file typically has resolver object specifications as follows:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> # /etc/nsswitch.conf
#
# Name Service Switch configuration file.
#
passwd: compat
# Alternative entries for password authentication are:
# passwd: compat files nis ldap winbind
shadow: compat
group: compat
hosts: files nis dns
# Alternative entries for host name resolution are:
# hosts: files dns nis nis+ hesoid db compat ldap wins
networks: nis files dns
ethers: nis files
protocols: nis files
rpc: nis files
services: nis files</PRE
></TD
></TR
></TABLE
></P
><P
>Of course, each of these mechanisms requires that the appropriate
facilities and/or services are correctly configured.</P
><P
>It should be noted that unless a network request/message must be
sent, TCP/IP networks are silent. All TCP/IP communications assumes a
principal of speaking only when necessary.</P
><P
>Samba version 2.2.0 will add Linux support for extensions to
the name service switch infrastructure so that linux clients will
be able to obtain resolution of MS Windows NetBIOS names to IP
Addresses. To gain this functionality Samba needs to be compiled
with appropriate arguments to the make command (ie: <B
CLASS="COMMAND"
>make
nsswitch/libnss_wins.so</B
>). The resulting library should
then be installed in the <TT
CLASS="FILENAME"
>/lib</TT
> directory and
the "wins" parameter needs to be added to the "hosts:" line in
the <TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
> file. At this point it
will be possible to ping any MS Windows machine by it's NetBIOS
machine name, so long as that machine is within the workgroup to
which both the samba machine and the MS Windows machine belong.</P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN309"
>2.3. Name resolution as used within MS Windows networking</A
></H1
><P
>MS Windows networking is predicated about the name each machine
is given. This name is known variously (and inconsistently) as
the "computer name", "machine name", "networking name", "netbios name",
"SMB name". All terms mean the same thing with the exception of
"netbios name" which can apply also to the name of the workgroup or the
domain name. The terms "workgroup" and "domain" are really just a
simply name with which the machine is associated. All NetBIOS names
are exactly 16 characters in length. The 16th character is reserved.
It is used to store a one byte value that indicates service level
information for the NetBIOS name that is registered. A NetBIOS machine
name is therefore registered for each service type that is provided by
the client/server.</P
><P
>The following are typical NetBIOS name/service type registrations:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> Unique NetBIOS Names:
MACHINENAME<00> = Server Service is running on MACHINENAME
MACHINENAME<03> = Generic Machine Name (NetBIOS name)
MACHINENAME<20> = LanMan Server service is running on MACHINENAME
WORKGROUP<1b> = Domain Master Browser
Group Names:
WORKGROUP<03> = Generic Name registered by all members of WORKGROUP
WORKGROUP<1c> = Domain Controllers / Netlogon Servers
WORKGROUP<1d> = Local Master Browsers
WORKGROUP<1e> = Internet Name Resolvers</PRE
></TD
></TR
></TABLE
></P
><P
>It should be noted that all NetBIOS machines register their own
names as per the above. This is in vast contrast to TCP/IP
installations where traditionally the system administrator will
determine in the /etc/hosts or in the DNS database what names
are associated with each IP address.</P
><P
>One further point of clarification should be noted, the <TT
CLASS="FILENAME"
>/etc/hosts</TT
>
file and the DNS records do not provide the NetBIOS name type information
that MS Windows clients depend on to locate the type of service that may
be needed. An example of this is what happens when an MS Windows client
wants to locate a domain logon server. It find this service and the IP
address of a server that provides it by performing a lookup (via a
NetBIOS broadcast) for enumeration of all machines that have
registered the name type *<1c>. A logon request is then sent to each
IP address that is returned in the enumerated list of IP addresses. Which
ever machine first replies then ends up providing the logon services.</P
><P
>The name "workgroup" or "domain" really can be confusing since these
have the added significance of indicating what is the security
architecture of the MS Windows network. The term "workgroup" indicates
that the primary nature of the network environment is that of a
peer-to-peer design. In a WORKGROUP all machines are responsible for
their own security, and generally such security is limited to use of
just a password (known as SHARE MORE security). In most situations
with peer-to-peer networking the users who control their own machines
will simply opt to have no security at all. It is possible to have
USER MODE security in a WORKGROUP environment, thus requiring use
of a user name and a matching password.</P
><P
>MS Windows networking is thus predetermined to use machine names
for all local and remote machine message passing. The protocol used is
called Server Message Block (SMB) and this is implemented using
the NetBIOS protocol (Network Basic Input Output System). NetBIOS can
be encapsulated using LLC (Logical Link Control) protocol - in which case
the resulting protocol is called NetBEUI (Network Basic Extended User
Interface). NetBIOS can also be run over IPX (Internetworking Packet
Exchange) protocol as used by Novell NetWare, and it can be run
over TCP/IP protocols - in which case the resulting protocol is called
NBT or NetBT, the NetBIOS over TCP/IP.</P
><P
>MS Windows machines use a complex array of name resolution mechanisms.
Since we are primarily concerned with TCP/IP this demonstration is
limited to this area.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN321"
>2.3.1. The NetBIOS Name Cache</A
></H2
><P
>All MS Windows machines employ an in memory buffer in which is
stored the NetBIOS names and their IP addresses for all external
machines that that the local machine has communicated with over the
past 10-15 minutes. It is more efficient to obtain an IP address
for a machine from the local cache than it is to go through all the
configured name resolution mechanisms.</P
><P
>If a machine whose name is in the local name cache has been shut
down before the name had been expired and flushed from the cache, then
an attempt to exchange a message with that machine will be subject
to time-out delays. ie: It's name is in the cache, so a name resolution
lookup will succeed, but the machine can not respond. This can be
frustrating for users - but it is a characteristic of the protocol.</P
><P
>The MS Windows utility that allows examination of the NetBIOS
name cache is called "nbtstat". The Samba equivalent of this
is called "nmblookup".</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN326"
>2.3.2. The LMHOSTS file</A
></H2
><P
>This file is usually located in MS Windows NT 4.0 or
2000 in <TT
CLASS="FILENAME"
>C:\WINNT\SYSTEM32\DRIVERS\ETC</TT
> and contains
the IP Address and the machine name in matched pairs. The
<TT
CLASS="FILENAME"
>LMHOSTS</TT
> file performs NetBIOS name
to IP address mapping oriented.</P
><P
>It typically looks like:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> # Copyright (c) 1998 Microsoft Corp.
#
# This is a sample LMHOSTS file used by the Microsoft Wins Client (NetBIOS
# over TCP/IP) stack for Windows98
#
# This file contains the mappings of IP addresses to NT computernames
# (NetBIOS) names. Each entry should be kept on an individual line.
# The IP address should be placed in the first column followed by the
# corresponding computername. The address and the comptername
# should be separated by at least one space or tab. The "#" character
# is generally used to denote the start of a comment (see the exceptions
# below).
#
# This file is compatible with Microsoft LAN Manager 2.x TCP/IP lmhosts
# files and offers the following extensions:
#
# #PRE
# #DOM:<domain>
# #INCLUDE <filename>
# #BEGIN_ALTERNATE
# #END_ALTERNATE
# \0xnn (non-printing character support)
#
# Following any entry in the file with the characters "#PRE" will cause
# the entry to be preloaded into the name cache. By default, entries are
# not preloaded, but are parsed only after dynamic name resolution fails.
#
# Following an entry with the "#DOM:<domain>" tag will associate the
# entry with the domain specified by <domain>. This affects how the
# browser and logon services behave in TCP/IP environments. To preload
# the host name associated with #DOM entry, it is necessary to also add a
# #PRE to the line. The <domain> is always preloaded although it will not
# be shown when the name cache is viewed.
#
# Specifying "#INCLUDE <filename>" will force the RFC NetBIOS (NBT)
# software to seek the specified <filename> and parse it as if it were
# local. <filename> is generally a UNC-based name, allowing a
# centralized lmhosts file to be maintained on a server.
# It is ALWAYS necessary to provide a mapping for the IP address of the
# server prior to the #INCLUDE. This mapping must use the #PRE directive.
# In addtion the share "public" in the example below must be in the
# LanManServer list of "NullSessionShares" in order for client machines to
# be able to read the lmhosts file successfully. This key is under
# \machine\system\currentcontrolset\services\lanmanserver\parameters\nullsessionshares
# in the registry. Simply add "public" to the list found there.
#
# The #BEGIN_ and #END_ALTERNATE keywords allow multiple #INCLUDE
# statements to be grouped together. Any single successful include
# will cause the group to succeed.
#
# Finally, non-printing characters can be embedded in mappings by
# first surrounding the NetBIOS name in quotations, then using the
# \0xnn notation to specify a hex value for a non-printing character.
#
# The following example illustrates all of these extensions:
#
# 102.54.94.97 rhino #PRE #DOM:networking #net group's DC
# 102.54.94.102 "appname \0x14" #special app server
# 102.54.94.123 popular #PRE #source server
# 102.54.94.117 localsrv #PRE #needed for the include
#
# #BEGIN_ALTERNATE
# #INCLUDE \\localsrv\public\lmhosts
# #INCLUDE \\rhino\public\lmhosts
# #END_ALTERNATE
#
# In the above example, the "appname" server contains a special
# character in its name, the "popular" and "localsrv" server names are
# preloaded, and the "rhino" server name is specified so it can be used
# to later #INCLUDE a centrally maintained lmhosts file if the "localsrv"
# system is unavailable.
#
# Note that the whole file is parsed including comments on each lookup,
# so keeping the number of comments to a minimum will improve performance.
# Therefore it is not advisable to simply add lmhosts file entries onto the
# end of this file.</PRE
></TD
></TR
></TABLE
></P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN334"
>2.3.3. HOSTS file</A
></H2
><P
>This file is usually located in MS Windows NT 4.0 or 2000 in
<TT
CLASS="FILENAME"
>C:\WINNT\SYSTEM32\DRIVERS\ETC</TT
> and contains
the IP Address and the IP hostname in matched pairs. It can be
used by the name resolution infrastructure in MS Windows, depending
on how the TCP/IP environment is configured. This file is in
every way the equivalent of the Unix/Linux <TT
CLASS="FILENAME"
>/etc/hosts</TT
> file.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN339"
>2.3.4. DNS Lookup</A
></H2
><P
>This capability is configured in the TCP/IP setup area in the network
configuration facility. If enabled an elaborate name resolution sequence
is followed the precise nature of which isdependant on what the NetBIOS
Node Type parameter is configured to. A Node Type of 0 means use
NetBIOS broadcast (over UDP broadcast) is first used if the name
that is the subject of a name lookup is not found in the NetBIOS name
cache. If that fails then DNS, HOSTS and LMHOSTS are checked. If set to
Node Type 8, then a NetBIOS Unicast (over UDP Unicast) is sent to the
WINS Server to obtain a lookup before DNS, HOSTS, LMHOSTS, or broadcast
lookup is used.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN342"
>2.3.5. WINS Lookup</A
></H2
><P
>A WINS (Windows Internet Name Server) service is the equivaent of the
rfc1001/1002 specified NBNS (NetBIOS Name Server). A WINS server stores
the names and IP addresses that are registered by a Windows client
if the TCP/IP setup has been given at least one WINS Server IP Address.</P
><P
>To configure Samba to be a WINS server the following parameter needs
to be added to the <TT
CLASS="FILENAME"
>smb.conf</TT
> file:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> wins support = Yes</PRE
></TD
></TR
></TABLE
></P
><P
>To configure Samba to use a WINS server the following parameters are
needed in the smb.conf file:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> wins support = No
wins server = xxx.xxx.xxx.xxx</PRE
></TD
></TR
></TABLE
></P
><P
>where <TT
CLASS="REPLACEABLE"
><I
>xxx.xxx.xxx.xxx</I
></TT
> is the IP address
of the WINS server.</P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN354"
>2.4. How browsing functions and how to deploy stable and
dependable browsing using Samba</A
></H1
><P
>As stated above, MS Windows machines register their NetBIOS names
(ie: the machine name for each service type in operation) on start
up. Also, as stated above, the exact method by which this name registration
takes place is determined by whether or not the MS Windows client/server
has been given a WINS server address, whether or not LMHOSTS lookup
is enabled, or if DNS for NetBIOS name resolution is enabled, etc.</P
><P
>In the case where there is no WINS server all name registrations as
well as name lookups are done by UDP broadcast. This isolates name
resolution to the local subnet, unless LMHOSTS is used to list all
names and IP addresses. In such situations Samba provides a means by
which the samba server name may be forcibly injected into the browse
list of a remote MS Windows network (using the "remote announce" parameter).</P
><P
>Where a WINS server is used, the MS Windows client will use UDP
unicast to register with the WINS server. Such packets can be routed
and thus WINS allows name resolution to function across routed networks.</P
><P
>During the startup process an election will take place to create a
local master browser if one does not already exist. On each NetBIOS network
one machine will be elected to function as the domain master browser. This
domain browsing has nothing to do with MS security domain control.
Instead, the domain master browser serves the role of contacting each local
master browser (found by asking WINS or from LMHOSTS) and exchanging browse
list contents. This way every master browser will eventually obtain a complete
list of all machines that are on the network. Every 11-15 minutes an election
is held to determine which machine will be the master browser. By nature of
the election criteria used, the machine with the highest uptime, or the
most senior protocol version, or other criteria, will win the election
as domain master browser.</P
><P
>Clients wishing to browse the network make use of this list, but also depend
on the availability of correct name resolution to the respective IP
address/addresses. </P
><P
>Any configuration that breaks name resolution and/or browsing intrinsics
will annoy users because they will have to put up with protracted
inability to use the network services.</P
><P
>Samba supports a feature that allows forced synchonisation
of browse lists across routed networks using the "remote
browse sync" parameter in the smb.conf file. This causes Samba
to contact the local master browser on a remote network and
to request browse list synchronisation. This effectively bridges
two networks that are separated by routers. The two remote
networks may use either broadcast based name resolution or WINS
based name resolution, but it should be noted that the "remote
browse sync" parameter provides browse list synchronisation - and
that is distinct from name to address resolution, in other
words, for cross subnet browsing to function correctly it is
essential that a name to address resolution mechanism be provided.
This mechanism could be via DNS, <TT
CLASS="FILENAME"
>/etc/hosts</TT
>,
and so on.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN364"
>2.5. MS Windows security options and how to configure
Samba for seemless integration</A
></H1
><P
>MS Windows clients may use encrypted passwords as part of a
challenege/response authentication model (a.k.a. NTLMv1) or
alone, or clear text strings for simple password based
authentication. It should be realized that with the SMB
protocol the password is passed over the network either
in plain text or encrypted, but not both in the same
authentication requets.</P
><P
>When encrypted passwords are used a password that has been
entered by the user is encrypted in two ways:</P
><P
></P
><UL
><LI
><P
>An MD4 hash of the UNICODE of the password
string. This is known as the NT hash.
</P
></LI
><LI
><P
>The password is converted to upper case,
and then padded or trucated to 14 bytes. This string is
then appended with 5 bytes of NULL characters and split to
form two 56 bit DES keys to encrypt a "magic" 8 byte value.
The resulting 16 bytes for the LanMan hash.
</P
></LI
></UL
><P
>You should refer to the <A
HREF="ENCRYPTION.html"
TARGET="_top"
>Password Encryption</A
> chapter in this HOWTO collection
for more details on the inner workings</P
><P
>MS Windows 95 pre-service pack 1, MS Windows NT versions 3.x
and version 4.0 pre-service pack 3 will use either mode of
password authentication. All versions of MS Windows that follow
these versions no longer support plain text passwords by default.</P
><P
>MS Windows clients have a habit of dropping network mappings that
have been idle for 10 minutes or longer. When the user attempts to
use the mapped drive connection that has been dropped the SMB protocol
has a mechanism by which the connection can be re-established using
a cached copy of the password.</P
><P
>When Microsoft changed the default password mode, they dropped support for
caching of the plain text password. This means that when the registry
parameter is changed to re-enable use of plain text passwords it appears to
work, but when a dropped mapping attempts to revalidate it will fail if
the remote authentication server does not support encrypted passwords.
This means that it is definitely not a good idea to re-enable plain text
password support in such clients.</P
><P
>The following parameters can be used to work around the
issue of Windows 9x client upper casing usernames and
password before transmitting them to the SMB server
when using clear text authentication.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> <A
HREF="smb.conf.5.html#PASSWORDLEVEL"
TARGET="_top"
>passsword level</A
> = <TT
CLASS="REPLACEABLE"
><I
>integer</I
></TT
>
<A
HREF="smb.conf.5.html#USERNAMELEVEL"
TARGET="_top"
>username level</A
> = <TT
CLASS="REPLACEABLE"
><I
>integer</I
></TT
></PRE
></TD
></TR
></TABLE
></P
><P
>By default Samba will lower case the username before attempting
to lookup the user in the database of local system accounts.
Because UNIX usernames conventionally only contain lower case
character, the <TT
CLASS="PARAMETER"
><I
>username level</I
></TT
> parameter
is rarely even needed.</P
><P
>However, password on UNIX systems often make use of mixed case
characters. This means that in order for a user on a Windows 9x
client to connect to a Samba server using clear text authentication,
the <TT
CLASS="PARAMETER"
><I
>password level</I
></TT
> must be set to the maximum
number of upper case letter which <EM
>could</EM
> appear
is a password. Note that is the server OS uses the traditional
DES version of crypt(), then a <TT
CLASS="PARAMETER"
><I
>password level</I
></TT
>
of 8 will result in case insensitive passwords as seen from Windows
users. This will also result in longer login times as Samba
hash to compute the permutations of the password string and
try them one by one until a match is located (or all combinations fail).</P
><P
>The best option to adopt is to enable support for encrypted passwords
where ever Samba is used. There are three configuration possibilities
for support of encrypted passwords:</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN392"
>2.5.1. Use MS Windows NT as an authentication server</A
></H2
><P
>This method involves the additions of the following parameters
in the smb.conf file:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> encrypt passwords = Yes
security = server
password server = "NetBIOS_name_of_PDC"</PRE
></TD
></TR
></TABLE
></P
><P
>There are two ways of identifying whether or not a username and
password pair was valid or not. One uses the reply information provided
as part of the authentication messaging process, the other uses
just and error code.</P
><P
>The down-side of this mode of configuration is the fact that
for security reasons Samba will send the password server a bogus
username and a bogus password and if the remote server fails to
reject the username and password pair then an alternative mode
of identification of validation is used. Where a site uses password
lock out after a certain number of failed authentication attempts
this will result in user lockouts.</P
><P
>Use of this mode of authentication does require there to be
a standard Unix account for the user, this account can be blocked
to prevent logons by other than MS Windows clients.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN400"
>2.5.2. Make Samba a member of an MS Windows NT security domain</A
></H2
><P
>This method involves additon of the following paramters in the smb.conf file:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> encrypt passwords = Yes
security = domain
workgroup = "name of NT domain"
password server = *</PRE
></TD
></TR
></TABLE
></P
><P
>The use of the "*" argument to "password server" will cause samba
to locate the domain controller in a way analogous to the way
this is done within MS Windows NT.</P
><P
>In order for this method to work the Samba server needs to join the
MS Windows NT security domain. This is done as follows:</P
><P
></P
><UL
><LI
><P
>On the MS Windows NT domain controller using
the Server Manager add a machine account for the Samba server.
</P
></LI
><LI
><P
>Next, on the Linux system execute:
<B
CLASS="COMMAND"
>smbpasswd -r PDC_NAME -j DOMAIN_NAME</B
>
</P
></LI
></UL
><P
>Use of this mode of authentication does require there to be
a standard Unix account for the user in order to assign
a uid once the account has been authenticated by the remote
Windows DC. This account can be blocked to prevent logons by
other than MS Windows clients by things such as setting an invalid
shell in the <TT
CLASS="FILENAME"
>/etc/passwd</TT
> entry.</P
><P
>An alternative to assigning UIDs to Windows users on a
Samba member server is presented in the <A
HREF="winbind.html"
TARGET="_top"
>Winbind Overview</A
> chapter in
this HOWTO collection.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN417"
>2.5.3. Configure Samba as an authentication server</A
></H2
><P
>This mode of authentication demands that there be on the
Unix/Linux system both a Unix style account as well as and
smbpasswd entry for the user. The Unix system account can be
locked if required as only the encrypted password will be
used for SMB client authentication.</P
><P
>This method involves addition of the following parameters to
the smb.conf file:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>## please refer to the Samba PDC HOWTO chapter later in
## this collection for more details
[global]
encrypt passwords = Yes
security = user
domain logons = Yes
; an OS level of 33 or more is recommended
os level = 33
[NETLOGON]
path = /somewhare/in/file/system
read only = yes</PRE
></TD
></TR
></TABLE
></P
><P
>in order for this method to work a Unix system account needs
to be created for each user, as well as for each MS Windows NT/2000
machine. The following structure is required.</P
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN424"
>2.5.3.1. Users</A
></H3
><P
>A user account that may provide a home directory should be
created. The following Linux system commands are typical of
the procedure for creating an account.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> # useradd -s /bin/bash -d /home/"userid" -m "userid"
# passwd "userid"
Enter Password: <pw>
# smbpasswd -a "userid"
Enter Password: <pw></PRE
></TD
></TR
></TABLE
></P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN429"
>2.5.3.2. MS Windows NT Machine Accounts</A
></H3
><P
>These are required only when Samba is used as a domain
controller. Refer to the Samba-PDC-HOWTO for more details.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> # useradd -s /bin/false -d /dev/null "machine_name"\$
# passwd -l "machine_name"\$
# smbpasswd -a -m "machine_name"</PRE
></TD
></TR
></TABLE
></P
></DIV
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN434"
>2.6. Conclusions</A
></H1
><P
>Samba provides a flexible means to operate as...</P
><P
></P
><UL
><LI
><P
>A Stand-alone server - No special action is needed
other than to create user accounts. Stand-alone servers do NOT
provide network logon services, meaning that machines that use this
server do NOT perform a domain logon but instead make use only of
the MS Windows logon which is local to the MS Windows
workstation/server.
</P
></LI
><LI
><P
>An MS Windows NT 3.x/4.0 security domain member.
</P
></LI
><LI
><P
>An alternative to an MS Windows NT 3.x/4.0
Domain Controller.
</P
></LI
></UL
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="PAM"
>Chapter 3. Configuring PAM for distributed but centrally
managed authentication</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN455"
>3.1. Samba and PAM</A
></H1
><P
>A number of Unix systems (eg: Sun Solaris), as well as the
xxxxBSD family and Linux, now utilize the Pluggable Authentication
Modules (PAM) facility to provide all authentication,
authorization and resource control services. Prior to the
introduction of PAM, a decision to use an alternative to
the system password database (<TT
CLASS="FILENAME"
>/etc/passwd</TT
>)
would require the provision of alternatives for all programs that provide
security services. Such a choice would involve provision of
alternatives to such programs as: <B
CLASS="COMMAND"
>login</B
>,
<B
CLASS="COMMAND"
>passwd</B
>, <B
CLASS="COMMAND"
>chown</B
>, etc.</P
><P
>PAM provides a mechanism that disconnects these security programs
from the underlying authentication/authorization infrastructure.
PAM is configured either through one file <TT
CLASS="FILENAME"
>/etc/pam.conf</TT
> (Solaris),
or by editing individual files that are located in <TT
CLASS="FILENAME"
>/etc/pam.d</TT
>.</P
><P
>The following is an example <TT
CLASS="FILENAME"
>/etc/pam.d/login</TT
> configuration file.
This example had all options been uncommented is probably not usable
as it stacks many conditions before allowing successful completion
of the login process. Essentially all conditions can be disabled
by commenting them out except the calls to <TT
CLASS="FILENAME"
>pam_pwdb.so</TT
>.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#%PAM-1.0
# The PAM configuration file for the `login' service
#
auth required pam_securetty.so
auth required pam_nologin.so
# auth required pam_dialup.so
# auth optional pam_mail.so
auth required pam_pwdb.so shadow md5
# account requisite pam_time.so
account required pam_pwdb.so
session required pam_pwdb.so
# session optional pam_lastlog.so
# password required pam_cracklib.so retry=3
password required pam_pwdb.so shadow md5</PRE
></TD
></TR
></TABLE
></P
><P
>PAM allows use of replacable modules. Those available on a
sample system include:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>$ /bin/ls /lib/security
pam_access.so pam_ftp.so pam_limits.so
pam_ncp_auth.so pam_rhosts_auth.so pam_stress.so
pam_cracklib.so pam_group.so pam_listfile.so
pam_nologin.so pam_rootok.so pam_tally.so
pam_deny.so pam_issue.so pam_mail.so
pam_permit.so pam_securetty.so pam_time.so
pam_dialup.so pam_lastlog.so pam_mkhomedir.so
pam_pwdb.so pam_shells.so pam_unix.so
pam_env.so pam_ldap.so pam_motd.so
pam_radius.so pam_smbpass.so pam_unix_acct.so
pam_wheel.so pam_unix_auth.so pam_unix_passwd.so
pam_userdb.so pam_warn.so pam_unix_session.so</PRE
></TD
></TR
></TABLE
></P
><P
>The following example for the login program replaces the use of
the <TT
CLASS="FILENAME"
>pam_pwdb.so</TT
> module which uses the system
password database (<TT
CLASS="FILENAME"
>/etc/passwd</TT
>,
<TT
CLASS="FILENAME"
>/etc/shadow</TT
>, <TT
CLASS="FILENAME"
>/etc/group</TT
>) with
the module <TT
CLASS="FILENAME"
>pam_smbpass.so</TT
> which uses the Samba
database which contains the Microsoft MD4 encrypted password
hashes. This database is stored in either
<TT
CLASS="FILENAME"
>/usr/local/samba/private/smbpasswd</TT
>,
<TT
CLASS="FILENAME"
>/etc/samba/smbpasswd</TT
>, or in
<TT
CLASS="FILENAME"
>/etc/samba.d/smbpasswd</TT
>, depending on the
Samba implementation for your Unix/Linux system. The
<TT
CLASS="FILENAME"
>pam_smbpass.so</TT
> module is provided by
Samba version 2.2.1 or later. It can be compiled by specifying the
<B
CLASS="COMMAND"
>--with-pam_smbpass</B
> options when running Samba's
<TT
CLASS="FILENAME"
>configure</TT
> script. For more information
on the <TT
CLASS="FILENAME"
>pam_smbpass</TT
> module, see the documentation
in the <TT
CLASS="FILENAME"
>source/pam_smbpass</TT
> directory of the Samba
source distribution.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#%PAM-1.0
# The PAM configuration file for the `login' service
#
auth required pam_smbpass.so nodelay
account required pam_smbpass.so nodelay
session required pam_smbpass.so nodelay
password required pam_smbpass.so nodelay</PRE
></TD
></TR
></TABLE
></P
><P
>The following is the PAM configuration file for a particular
Linux system. The default condition uses <TT
CLASS="FILENAME"
>pam_pwdb.so</TT
>.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#%PAM-1.0
# The PAM configuration file for the `samba' service
#
auth required /lib/security/pam_pwdb.so nullok nodelay shadow audit
account required /lib/security/pam_pwdb.so audit nodelay
session required /lib/security/pam_pwdb.so nodelay
password required /lib/security/pam_pwdb.so shadow md5</PRE
></TD
></TR
></TABLE
></P
><P
>In the following example the decision has been made to use the
smbpasswd database even for basic samba authentication. Such a
decision could also be made for the passwd program and would
thus allow the smbpasswd passwords to be changed using the passwd
program.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#%PAM-1.0
# The PAM configuration file for the `samba' service
#
auth required /lib/security/pam_smbpass.so nodelay
account required /lib/security/pam_pwdb.so audit nodelay
session required /lib/security/pam_pwdb.so nodelay
password required /lib/security/pam_smbpass.so nodelay smbconf=/etc/samba.d/smb.conf</PRE
></TD
></TR
></TABLE
></P
><P
>Note: PAM allows stacking of authentication mechanisms. It is
also possible to pass information obtained within on PAM module through
to the next module in the PAM stack. Please refer to the documentation for
your particular system implementation for details regarding the specific
capabilities of PAM in this environment. Some Linux implmentations also
provide the <TT
CLASS="FILENAME"
>pam_stack.so</TT
> module that allows all
authentication to be configured in a single central file. The
<TT
CLASS="FILENAME"
>pam_stack.so</TT
> method has some very devoted followers
on the basis that it allows for easier administration. As with all issues in
life though, every decision makes trade-offs, so you may want examine the
PAM documentation for further helpful information.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN499"
>3.2. Distributed Authentication</A
></H1
><P
>The astute administrator will realize from this that the
combination of <TT
CLASS="FILENAME"
>pam_smbpass.so</TT
>,
<B
CLASS="COMMAND"
>winbindd</B
>, and <B
CLASS="COMMAND"
>rsync</B
> (see
<A
HREF="http://rsync.samba.org/"
TARGET="_top"
>http://rsync.samba.org/</A
>)
will allow the establishment of a centrally managed, distributed
user/password database that can also be used by all
PAM (eg: Linux) aware programs and applications. This arrangement
can have particularly potent advantages compared with the
use of Microsoft Active Directory Service (ADS) in so far as
reduction of wide area network authentication traffic.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN506"
>3.3. PAM Configuration in smb.conf</A
></H1
><P
>There is an option in smb.conf called <A
HREF="smb.conf.5.html#OBEYPAMRESTRICTIONS"
TARGET="_top"
>obey pam restrictions</A
>.
The following is from the on-line help for this option in SWAT;</P
><P
>When Samba 2.2 is configure to enable PAM support (i.e.
<TT
CLASS="CONSTANT"
>--with-pam</TT
>), this parameter will
control whether or not Samba should obey PAM's account
and session management directives. The default behavior
is to use PAM for clear text authentication only and to
ignore any account or session management. Note that Samba always
ignores PAM for authentication in the case of
<A
HREF="smb.conf.5.html#ENCRYPTPASSWORDS"
TARGET="_top"
>encrypt passwords = yes</A
>.
The reason is that PAM modules cannot support the challenge/response
authentication mechanism needed in the presence of SMB
password encryption. </P
><P
>Default: <B
CLASS="COMMAND"
>obey pam restrictions = no</B
></P
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="MSDFS"
>Chapter 4. Hosting a Microsoft Distributed File System tree on Samba</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN526"
>4.1. Instructions</A
></H1
><P
>The Distributed File System (or Dfs) provides a means of
separating the logical view of files and directories that users
see from the actual physical locations of these resources on the
network. It allows for higher availability, smoother storage expansion,
load balancing etc. For more information about Dfs, refer to <A
HREF="http://www.microsoft.com/NTServer/nts/downloads/winfeatures/NTSDistrFile/AdminGuide.asp"
TARGET="_top"
> Microsoft documentation</A
>. </P
><P
>This document explains how to host a Dfs tree on a Unix
machine (for Dfs-aware clients to browse) using Samba.</P
><P
>To enable SMB-based DFS for Samba, configure it with the
<TT
CLASS="PARAMETER"
><I
>--with-msdfs</I
></TT
> option. Once built, a
Samba server can be made a Dfs server by setting the global
boolean <A
HREF="smb.conf.5.html#HOSTMSDFS"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
> host msdfs</I
></TT
></A
> parameter in the <TT
CLASS="FILENAME"
>smb.conf
</TT
> file. You designate a share as a Dfs root using the share
level boolean <A
HREF="smb.conf.5.html#MSDFSROOT"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
> msdfs root</I
></TT
></A
> parameter. A Dfs root directory on
Samba hosts Dfs links in the form of symbolic links that point
to other servers. For example, a symbolic link
<TT
CLASS="FILENAME"
>junction->msdfs:storage1\share1</TT
> in
the share directory acts as the Dfs junction. When Dfs-aware
clients attempt to access the junction link, they are redirected
to the storage location (in this case, \\storage1\share1).</P
><P
>Dfs trees on Samba work with all Dfs-aware clients ranging
from Windows 95 to 2000.</P
><P
>Here's an example of setting up a Dfs tree on a Samba
server.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
># The smb.conf file:
[global]
netbios name = SAMBA
host msdfs = yes
[dfs]
path = /export/dfsroot
msdfs root = yes
</PRE
></TD
></TR
></TABLE
></P
><P
>In the /export/dfsroot directory we set up our dfs links to
other servers on the network.</P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>cd /export/dfsroot</B
></TT
></P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>chown root /export/dfsroot</B
></TT
></P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>chmod 755 /export/dfsroot</B
></TT
></P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>ln -s msdfs:storageA\\shareA linka</B
></TT
></P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>ln -s msdfs:serverB\\share,serverC\\share linkb</B
></TT
></P
><P
>You should set up the permissions and ownership of
the directory acting as the Dfs root such that only designated
users can create, delete or modify the msdfs links. Also note
that symlink names should be all lowercase. This limitation exists
to have Samba avoid trying all the case combinations to get at
the link name. Finally set up the symbolic links to point to the
network shares you want, and start Samba.</P
><P
>Users on Dfs-aware clients can now browse the Dfs tree
on the Samba server at \\samba\dfs. Accessing
links linka or linkb (which appear as directories to the client)
takes users directly to the appropriate shares on the network.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN561"
>4.1.1. Notes</A
></H2
><P
></P
><UL
><LI
><P
>Windows clients need to be rebooted
if a previously mounted non-dfs share is made a dfs
root or vice versa. A better way is to introduce a
new share and make it the dfs root.</P
></LI
><LI
><P
>Currently there's a restriction that msdfs
symlink names should all be lowercase.</P
></LI
><LI
><P
>For security purposes, the directory
acting as the root of the Dfs tree should have ownership
and permissions set so that only designated users can
modify the symbolic links in the directory.</P
></LI
></UL
></DIV
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="UNIX-PERMISSIONS"
>Chapter 5. UNIX Permission Bits and Windows NT Access Control Lists</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN581"
>5.1. Viewing and changing UNIX permissions using the NT
security dialogs</A
></H1
><P
>New in the Samba 2.0.4 release is the ability for Windows
NT clients to use their native security settings dialog box to
view and modify the underlying UNIX permissions.</P
><P
>Note that this ability is careful not to compromise
the security of the UNIX host Samba is running on, and
still obeys all the file permission rules that a Samba
administrator can set.</P
><P
>In Samba 2.0.4 and above the default value of the
parameter <A
HREF="smb.conf.5.html#NTACLSUPPORT"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
> nt acl support</I
></TT
></A
> has been changed from
<TT
CLASS="CONSTANT"
>false</TT
> to <TT
CLASS="CONSTANT"
>true</TT
>, so
manipulation of permissions is turned on by default.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN590"
>5.2. How to view file security on a Samba share</A
></H1
><P
>From an NT 4.0 client, single-click with the right
mouse button on any file or directory in a Samba mounted
drive letter or UNC path. When the menu pops-up, click
on the <EM
>Properties</EM
> entry at the bottom of
the menu. This brings up the normal file properties dialog
box, but with Samba 2.0.4 this will have a new tab along the top
marked <EM
>Security</EM
>. Click on this tab and you
will see three buttons, <EM
>Permissions</EM
>,
<EM
>Auditing</EM
>, and <EM
>Ownership</EM
>.
The <EM
>Auditing</EM
> button will cause either
an error message <SPAN
CLASS="ERRORNAME"
>A requested privilege is not held
by the client</SPAN
> to appear if the user is not the
NT Administrator, or a dialog which is intended to allow an
Administrator to add auditing requirements to a file if the
user is logged on as the NT Administrator. This dialog is
non-functional with a Samba share at this time, as the only
useful button, the <B
CLASS="COMMAND"
>Add</B
> button will not currently
allow a list of users to be seen.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN601"
>5.3. Viewing file ownership</A
></H1
><P
>Clicking on the <B
CLASS="COMMAND"
>"Ownership"</B
> button
brings up a dialog box telling you who owns the given file. The
owner name will be of the form :</P
><P
><B
CLASS="COMMAND"
>"SERVER\user (Long name)"</B
></P
><P
>Where <TT
CLASS="REPLACEABLE"
><I
>SERVER</I
></TT
> is the NetBIOS name of
the Samba server, <TT
CLASS="REPLACEABLE"
><I
>user</I
></TT
> is the user name of
the UNIX user who owns the file, and <TT
CLASS="REPLACEABLE"
><I
>(Long name)</I
></TT
>
is the descriptive string identifying the user (normally found in the
GECOS field of the UNIX password database). Click on the <B
CLASS="COMMAND"
>Close
</B
> button to remove this dialog.</P
><P
>If the parameter <TT
CLASS="PARAMETER"
><I
>nt acl support</I
></TT
>
is set to <TT
CLASS="CONSTANT"
>false</TT
> then the file owner will
be shown as the NT user <B
CLASS="COMMAND"
>"Everyone"</B
>.</P
><P
>The <B
CLASS="COMMAND"
>Take Ownership</B
> button will not allow
you to change the ownership of this file to yourself (clicking on
it will display a dialog box complaining that the user you are
currently logged onto the NT client cannot be found). The reason
for this is that changing the ownership of a file is a privileged
operation in UNIX, available only to the <EM
>root</EM
>
user. As clicking on this button causes NT to attempt to change
the ownership of a file to the current user logged into the NT
client this will not work with Samba at this time.</P
><P
>There is an NT chown command that will work with Samba
and allow a user with Administrator privilege connected
to a Samba 2.0.4 server as root to change the ownership of
files on both a local NTFS filesystem or remote mounted NTFS
or Samba drive. This is available as part of the <EM
>Seclib
</EM
> NT security library written by Jeremy Allison of
the Samba Team, available from the main Samba ftp site.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN621"
>5.4. Viewing file or directory permissions</A
></H1
><P
>The third button is the <B
CLASS="COMMAND"
>"Permissions"</B
>
button. Clicking on this brings up a dialog box that shows both
the permissions and the UNIX owner of the file or directory.
The owner is displayed in the form :</P
><P
><B
CLASS="COMMAND"
>"SERVER\user (Long name)"</B
></P
><P
>Where <TT
CLASS="REPLACEABLE"
><I
>SERVER</I
></TT
> is the NetBIOS name of
the Samba server, <TT
CLASS="REPLACEABLE"
><I
>user</I
></TT
> is the user name of
the UNIX user who owns the file, and <TT
CLASS="REPLACEABLE"
><I
>(Long name)</I
></TT
>
is the descriptive string identifying the user (normally found in the
GECOS field of the UNIX password database).</P
><P
>If the parameter <TT
CLASS="PARAMETER"
><I
>nt acl support</I
></TT
>
is set to <TT
CLASS="CONSTANT"
>false</TT
> then the file owner will
be shown as the NT user <B
CLASS="COMMAND"
>"Everyone"</B
> and the
permissions will be shown as NT "Full Control".</P
><P
>The permissions field is displayed differently for files
and directories, so I'll describe the way file permissions
are displayed first.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN636"
>5.4.1. File Permissions</A
></H2
><P
>The standard UNIX user/group/world triple and
the corresponding "read", "write", "execute" permissions
triples are mapped by Samba into a three element NT ACL
with the 'r', 'w', and 'x' bits mapped into the corresponding
NT permissions. The UNIX world permissions are mapped into
the global NT group <B
CLASS="COMMAND"
>Everyone</B
>, followed
by the list of permissions allowed for UNIX world. The UNIX
owner and group permissions are displayed as an NT
<B
CLASS="COMMAND"
>user</B
> icon and an NT <B
CLASS="COMMAND"
>local
group</B
> icon respectively followed by the list
of permissions allowed for the UNIX user and group.</P
><P
>As many UNIX permission sets don't map into common
NT names such as <B
CLASS="COMMAND"
>"read"</B
>, <B
CLASS="COMMAND"
> "change"</B
> or <B
CLASS="COMMAND"
>"full control"</B
> then
usually the permissions will be prefixed by the words <B
CLASS="COMMAND"
> "Special Access"</B
> in the NT display list.</P
><P
>But what happens if the file has no permissions allowed
for a particular UNIX user group or world component ? In order
to allow "no permissions" to be seen and modified then Samba
overloads the NT <B
CLASS="COMMAND"
>"Take Ownership"</B
> ACL attribute
(which has no meaning in UNIX) and reports a component with
no permissions as having the NT <B
CLASS="COMMAND"
>"O"</B
> bit set.
This was chosen of course to make it look like a zero, meaning
zero permissions. More details on the decision behind this will
be given below.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN650"
>5.4.2. Directory Permissions</A
></H2
><P
>Directories on an NT NTFS file system have two
different sets of permissions. The first set of permissions
is the ACL set on the directory itself, this is usually displayed
in the first set of parentheses in the normal <B
CLASS="COMMAND"
>"RW"</B
>
NT style. This first set of permissions is created by Samba in
exactly the same way as normal file permissions are, described
above, and is displayed in the same way.</P
><P
>The second set of directory permissions has no real meaning
in the UNIX permissions world and represents the <B
CLASS="COMMAND"
> "inherited"</B
> permissions that any file created within
this directory would inherit.</P
><P
>Samba synthesises these inherited permissions for NT by
returning as an NT ACL the UNIX permission mode that a new file
created by Samba on this share would receive.</P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN657"
>5.5. Modifying file or directory permissions</A
></H1
><P
>Modifying file and directory permissions is as simple
as changing the displayed permissions in the dialog box, and
clicking the <B
CLASS="COMMAND"
>OK</B
> button. However, there are
limitations that a user needs to be aware of, and also interactions
with the standard Samba permission masks and mapping of DOS
attributes that need to also be taken into account.</P
><P
>If the parameter <TT
CLASS="PARAMETER"
><I
>nt acl support</I
></TT
>
is set to <TT
CLASS="CONSTANT"
>false</TT
> then any attempt to set
security permissions will fail with an <B
CLASS="COMMAND"
>"Access Denied"
</B
> message.</P
><P
>The first thing to note is that the <B
CLASS="COMMAND"
>"Add"</B
>
button will not return a list of users in Samba 2.0.4 (it will give
an error message of <B
CLASS="COMMAND"
>"The remote procedure call failed
and did not execute"</B
>). This means that you can only
manipulate the current user/group/world permissions listed in
the dialog box. This actually works quite well as these are the
only permissions that UNIX actually has.</P
><P
>If a permission triple (either user, group, or world)
is removed from the list of permissions in the NT dialog box,
then when the <B
CLASS="COMMAND"
>"OK"</B
> button is pressed it will
be applied as "no permissions" on the UNIX side. If you then
view the permissions again the "no permissions" entry will appear
as the NT <B
CLASS="COMMAND"
>"O"</B
> flag, as described above. This
allows you to add permissions back to a file or directory once
you have removed them from a triple component.</P
><P
>As UNIX supports only the "r", "w" and "x" bits of
an NT ACL then if other NT security attributes such as "Delete
access" are selected then they will be ignored when applied on
the Samba server.</P
><P
>When setting permissions on a directory the second
set of permissions (in the second set of parentheses) is
by default applied to all files within that directory. If this
is not what you want you must uncheck the <B
CLASS="COMMAND"
>"Replace
permissions on existing files"</B
> checkbox in the NT
dialog before clicking <B
CLASS="COMMAND"
>"OK"</B
>.</P
><P
>If you wish to remove all permissions from a
user/group/world component then you may either highlight the
component and click the <B
CLASS="COMMAND"
>"Remove"</B
> button,
or set the component to only have the special <B
CLASS="COMMAND"
>"Take
Ownership"</B
> permission (displayed as <B
CLASS="COMMAND"
>"O"
</B
>) highlighted.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN679"
>5.6. Interaction with the standard Samba create mask
parameters</A
></H1
><P
>Note that with Samba 2.0.5 there are four new parameters
to control this interaction. These are :</P
><P
><TT
CLASS="PARAMETER"
><I
>security mask</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>force security mode</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>directory security mask</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>force directory security mode</I
></TT
></P
><P
>Once a user clicks <B
CLASS="COMMAND"
>"OK"</B
> to apply the
permissions Samba maps the given permissions into a user/group/world
r/w/x triple set, and then will check the changed permissions for a
file against the bits set in the <A
HREF="smb.conf.5.html#SECURITYMASK"
TARGET="_top"
>
<TT
CLASS="PARAMETER"
><I
>security mask</I
></TT
></A
> parameter. Any bits that
were changed that are not set to '1' in this parameter are left alone
in the file permissions.</P
><P
>Essentially, zero bits in the <TT
CLASS="PARAMETER"
><I
>security mask</I
></TT
>
mask may be treated as a set of bits the user is <EM
>not</EM
>
allowed to change, and one bits are those the user is allowed to change.
</P
><P
>If not set explicitly this parameter is set to the same value as
the <A
HREF="smb.conf.5.html#CREATEMASK"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
>create mask
</I
></TT
></A
> parameter to provide compatibility with Samba 2.0.4
where this permission change facility was introduced. To allow a user to
modify all the user/group/world permissions on a file, set this parameter
to 0777.</P
><P
>Next Samba checks the changed permissions for a file against
the bits set in the <A
HREF="smb.conf.5.html#FORCESECURITYMODE"
TARGET="_top"
> <TT
CLASS="PARAMETER"
><I
>force security mode</I
></TT
></A
> parameter. Any bits
that were changed that correspond to bits set to '1' in this parameter
are forced to be set.</P
><P
>Essentially, bits set in the <TT
CLASS="PARAMETER"
><I
>force security mode
</I
></TT
> parameter may be treated as a set of bits that, when
modifying security on a file, the user has always set to be 'on'.</P
><P
>If not set explicitly this parameter is set to the same value
as the <A
HREF="smb.conf.5.html#FORCECREATEMODE"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
>force
create mode</I
></TT
></A
> parameter to provide compatibility
with Samba 2.0.4 where the permission change facility was introduced.
To allow a user to modify all the user/group/world permissions on a file
with no restrictions set this parameter to 000.</P
><P
>The <TT
CLASS="PARAMETER"
><I
>security mask</I
></TT
> and <TT
CLASS="PARAMETER"
><I
>force
security mode</I
></TT
> parameters are applied to the change
request in that order.</P
><P
>For a directory Samba will perform the same operations as
described above for a file except using the parameter <TT
CLASS="PARAMETER"
><I
> directory security mask</I
></TT
> instead of <TT
CLASS="PARAMETER"
><I
>security
mask</I
></TT
>, and <TT
CLASS="PARAMETER"
><I
>force directory security mode
</I
></TT
> parameter instead of <TT
CLASS="PARAMETER"
><I
>force security mode
</I
></TT
>.</P
><P
>The <TT
CLASS="PARAMETER"
><I
>directory security mask</I
></TT
> parameter
by default is set to the same value as the <TT
CLASS="PARAMETER"
><I
>directory mask
</I
></TT
> parameter and the <TT
CLASS="PARAMETER"
><I
>force directory security
mode</I
></TT
> parameter by default is set to the same value as
the <TT
CLASS="PARAMETER"
><I
>force directory mode</I
></TT
> parameter to provide
compatibility with Samba 2.0.4 where the permission change facility
was introduced.</P
><P
>In this way Samba enforces the permission restrictions that
an administrator can set on a Samba share, whilst still allowing users
to modify the permission bits within that restriction.</P
><P
>If you want to set up a share that allows users full control
in modifying the permission bits on their files and directories and
doesn't force any particular bits to be set 'on', then set the following
parameters in the <A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
>smb.conf(5)
</TT
></A
> file in that share specific section :</P
><P
><TT
CLASS="PARAMETER"
><I
>security mask = 0777</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>force security mode = 0</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>directory security mask = 0777</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>force directory security mode = 0</I
></TT
></P
><P
>As described, in Samba 2.0.4 the parameters :</P
><P
><TT
CLASS="PARAMETER"
><I
>create mask</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>force create mode</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>directory mask</I
></TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>force directory mode</I
></TT
></P
><P
>were used instead of the parameters discussed here.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN743"
>5.7. Interaction with the standard Samba file attribute
mapping</A
></H1
><P
>Samba maps some of the DOS attribute bits (such as "read
only") into the UNIX permissions of a file. This means there can
be a conflict between the permission bits set via the security
dialog and the permission bits set by the file attribute mapping.
</P
><P
>One way this can show up is if a file has no UNIX read access
for the owner it will show up as "read only" in the standard
file attributes tabbed dialog. Unfortunately this dialog is
the same one that contains the security info in another tab.</P
><P
>What this can mean is that if the owner changes the permissions
to allow themselves read access using the security dialog, clicks
<B
CLASS="COMMAND"
>"OK"</B
> to get back to the standard attributes tab
dialog, and then clicks <B
CLASS="COMMAND"
>"OK"</B
> on that dialog, then
NT will set the file permissions back to read-only (as that is what
the attributes still say in the dialog). This means that after setting
permissions and clicking <B
CLASS="COMMAND"
>"OK"</B
> to get back to the
attributes dialog you should always hit <B
CLASS="COMMAND"
>"Cancel"</B
>
rather than <B
CLASS="COMMAND"
>"OK"</B
> to ensure that your changes
are not overridden.</P
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="PRINTING"
>Chapter 6. Printing Support in Samba 2.2.x</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN764"
>6.1. Introduction</A
></H1
><P
>Beginning with the 2.2.0 release, Samba supports
the native Windows NT printing mechanisms implemented via
MS-RPC (i.e. the SPOOLSS named pipe). Previous versions of
Samba only supported LanMan printing calls.</P
><P
>The additional functionality provided by the new
SPOOLSS support includes:</P
><P
></P
><UL
><LI
><P
>Support for downloading printer driver
files to Windows 95/98/NT/2000 clients upon demand.
</P
></LI
><LI
><P
>Uploading of printer drivers via the
Windows NT Add Printer Wizard (APW) or the
Imprints tool set (refer to <A
HREF="http://imprints.sourceforge.net"
TARGET="_top"
>http://imprints.sourceforge.net</A
>).
</P
></LI
><LI
><P
>Support for the native MS-RPC printing
calls such as StartDocPrinter, EnumJobs(), etc... (See
the MSDN documentation at <A
HREF="http://msdn.microsoft.com/"
TARGET="_top"
>http://msdn.microsoft.com/</A
>
for more information on the Win32 printing API)
</P
></LI
><LI
><P
>Support for NT Access Control Lists (ACL)
on printer objects</P
></LI
><LI
><P
>Improved support for printer queue manipulation
through the use of an internal databases for spooled job
information</P
></LI
></UL
><P
>There has been some initial confusion about what all this means
and whether or not it is a requirement for printer drivers to be
installed on a Samba host in order to support printing from Windows
clients. A bug existed in Samba 2.2.0 which made Windows NT/2000 clients
require that the Samba server possess a valid driver for the printer.
This is fixed in Samba 2.2.1 and once again, Windows NT/2000 clients
can use the local APW for installing drivers to be used with a Samba
served printer. This is the same behavior exhibited by Windows 9x clients.
As a side note, Samba does not use these drivers in any way to process
spooled files. They are utilized entirely by the clients.</P
><P
>The following MS KB article, may be of some help if you are dealing with
Windows 2000 clients: <EM
>How to Add Printers with No User
Interaction in Windows 2000</EM
></P
><P
><A
HREF="http://support.microsoft.com/support/kb/articles/Q189/1/05.ASP"
TARGET="_top"
>http://support.microsoft.com/support/kb/articles/Q189/1/05.ASP</A
></P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN786"
>6.2. Configuration</A
></H1
><DIV
CLASS="WARNING"
><P
></P
><TABLE
CLASS="WARNING"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>[print$] vs. [printer$]</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>Previous versions of Samba recommended using a share named [printer$].
This name was taken from the printer$ service created by Windows 9x
clients when a printer was shared. Windows 9x printer servers always have
a printer$ service which provides read-only access via no
password in order to support printer driver downloads.</P
><P
>However, the initial implementation allowed for a
parameter named <TT
CLASS="PARAMETER"
><I
>printer driver location</I
></TT
>
to be used on a per share basis to specify the location of
the driver files associated with that printer. Another
parameter named <TT
CLASS="PARAMETER"
><I
>printer driver</I
></TT
> provided
a means of defining the printer driver name to be sent to
the client.</P
><P
>These parameters, including <TT
CLASS="PARAMETER"
><I
>printer driver
file</I
></TT
> parameter, are being depreciated and should not
be used in new installations. For more information on this change,
you should refer to the <A
HREF="#MIGRATION"
>Migration section</A
>
of this document.</P
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN797"
>6.2.1. Creating [print$]</A
></H2
><P
>In order to support the uploading of printer driver
files, you must first configure a file share named [print$].
The name of this share is hard coded in Samba's internals so
the name is very important (print$ is the service used by
Windows NT print servers to provide support for printer driver
download).</P
><P
>You should modify the server's smb.conf file to add the global
parameters and to create the
following file share (of course, some of the parameter values,
such as 'path' are arbitrary and should be replaced with
appropriate values for your site):</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>[global]
; members of the ntadmin group should be able
; to add drivers and set printer properties
; root is implicitly a 'printer admin'
printer admin = @ntadmin
[print$]
path = /usr/local/samba/printers
guest ok = yes
browseable = yes
read only = yes
; since this share is configured as read only, then we need
; a 'write list'. Check the file system permissions to make
; sure this account can copy files to the share. If this
; is setup to a non-root account, then it should also exist
; as a 'printer admin'
write list = @ntadmin,root</PRE
></TD
></TR
></TABLE
></P
><P
>The <A
HREF="smb.conf.5.html#WRITELIST"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
>write list</I
></TT
></A
> is used to allow administrative
level user accounts to have write access in order to update files
on the share. See the <A
HREF="smb.conf.5.html"
TARGET="_top"
>smb.conf(5)
man page</A
> for more information on configuring file shares.</P
><P
>The requirement for <A
HREF="smb.conf.5.html#GUESTOK"
TARGET="_top"
><B
CLASS="COMMAND"
>guest
ok = yes</B
></A
> depends upon how your
site is configured. If users will be guaranteed to have
an account on the Samba host, then this is a non-issue.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Author's Note: </B
>The non-issue is that if all your Windows NT users are guaranteed to be
authenticated by the Samba server (such as a domain member server and the NT
user has already been validated by the Domain Controller in
order to logon to the Windows NT console), then guest access
is not necessary. Of course, in a workgroup environment where
you just want to be able to print without worrying about
silly accounts and security, then configure the share for
guest access. You'll probably want to add <A
HREF="smb.conf.5.html#MAPTOGUEST"
TARGET="_top"
><B
CLASS="COMMAND"
>map to guest = Bad User</B
></A
> in the [global] section as well. Make sure
you understand what this parameter does before using it
though. --jerry</P
></BLOCKQUOTE
></DIV
><P
>In order for a Windows NT print server to support
the downloading of driver files by multiple client architectures,
it must create subdirectories within the [print$] service
which correspond to each of the supported client architectures.
Samba follows this model as well.</P
><P
>Next create the directory tree below the [print$] share
for each architecture you wish to support.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>[print$]-----
|-W32X86 ; "Windows NT x86"
|-WIN40 ; "Windows 95/98"
|-W32ALPHA ; "Windows NT Alpha_AXP"
|-W32MIPS ; "Windows NT R4000"
|-W32PPC ; "Windows NT PowerPC"</PRE
></TD
></TR
></TABLE
></P
><DIV
CLASS="WARNING"
><P
></P
><TABLE
CLASS="WARNING"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>ATTENTION! REQUIRED PERMISSIONS</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>In order to currently add a new driver to you Samba host,
one of two conditions must hold true:</P
><P
></P
><UL
><LI
><P
>The account used to connect to the Samba host
must have a uid of 0 (i.e. a root account)</P
></LI
><LI
><P
>The account used to connect to the Samba host
must be a member of the <A
HREF="smb.conf.5.html#PRINTERADMIN"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
>printer
admin</I
></TT
></A
> list.</P
></LI
></UL
><P
>Of course, the connected account must still possess access
to add files to the subdirectories beneath [print$]. Remember
that all file shares are set to 'read only' by default.</P
></TD
></TR
></TABLE
></DIV
><P
>Once you have created the required [print$] service and
associated subdirectories, simply log onto the Samba server using
a root (or <TT
CLASS="PARAMETER"
><I
>printer admin</I
></TT
>) account
from a Windows NT 4.0 client. Navigate to the "Printers" folder
on the Samba server. You should see an initial listing of printers
that matches the printer shares defined on your Samba host.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN832"
>6.2.2. Setting Drivers for Existing Printers</A
></H2
><P
>The initial listing of printers in the Samba host's
Printers folder will have no real printer driver assigned
to them. By default, in Samba 2.2.0 this driver name was set to
<EM
>NO PRINTER DRIVER AVAILABLE FOR THIS PRINTER</EM
>.
Later versions changed this to a NULL string to allow the use
tof the local Add Printer Wizard on NT/2000 clients.
Attempting to view the printer properties for a printer
which has this default driver assigned will result in
the error message:</P
><P
><EM
>Device settings cannot be displayed. The driver
for the specified printer is not installed, only spooler
properties will be displayed. Do you want to install the
driver now?</EM
></P
><P
>Click "No" in the error dialog and you will be presented with
the printer properties window. The way assign a driver to a
printer is to either</P
><P
></P
><UL
><LI
><P
>Use the "New Driver..." button to install
a new printer driver, or</P
></LI
><LI
><P
>Select a driver from the popup list of
installed drivers. Initially this list will be empty.</P
></LI
></UL
><P
>If you wish to install printer drivers for client
operating systems other than "Windows NT x86", you will need
to use the "Sharing" tab of the printer properties dialog.</P
><P
>Assuming you have connected with a root account, you
will also be able modify other printer properties such as
ACLs and device settings using this dialog box.</P
><P
>A few closing comments for this section, it is possible
on a Windows NT print server to have printers
listed in the Printers folder which are not shared. Samba does
not make this distinction. By definition, the only printers of
which Samba is aware are those which are specified as shares in
<TT
CLASS="FILENAME"
>smb.conf</TT
>.</P
><P
>Another interesting side note is that Windows NT clients do
not use the SMB printer share, but rather can print directly
to any printer on another Windows NT host using MS-RPC. This
of course assumes that the printing client has the necessary
privileges on the remote host serving the printer. The default
permissions assigned by Windows NT to a printer gives the "Print"
permissions to the "Everyone" well-known group.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN849"
>6.2.3. Support a large number of printers</A
></H2
><P
>One issue that has arisen during the development
phase of Samba 2.2 is the need to support driver downloads for
100's of printers. Using the Windows NT APW is somewhat
awkward to say the list. If more than one printer are using the
same driver, the <A
HREF="rpcclient.1.html"
TARGET="_top"
><B
CLASS="COMMAND"
>rpcclient's
setdriver command</B
></A
> can be used to set the driver
associated with an installed driver. The following is example
of how this could be accomplished:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>
<TT
CLASS="PROMPT"
>$ </TT
>rpcclient pogo -U root%secret -c "enumdrivers"
Domain=[NARNIA] OS=[Unix] Server=[Samba 2.2.0-alpha3]
[Windows NT x86]
Printer Driver Info 1:
Driver Name: [HP LaserJet 4000 Series PS]
Printer Driver Info 1:
Driver Name: [HP LaserJet 2100 Series PS]
Printer Driver Info 1:
Driver Name: [HP LaserJet 4Si/4SiMX PS]
<TT
CLASS="PROMPT"
>$ </TT
>rpcclient pogo -U root%secret -c "enumprinters"
Domain=[NARNIA] OS=[Unix] Server=[Samba 2.2.0-alpha3]
flags:[0x800000]
name:[\\POGO\hp-print]
description:[POGO\\POGO\hp-print,NO DRIVER AVAILABLE FOR THIS PRINTER,]
comment:[]
<TT
CLASS="PROMPT"
>$ </TT
>rpcclient pogo -U root%secret \
<TT
CLASS="PROMPT"
>> </TT
> -c "setdriver hp-print \"HP LaserJet 4000 Series PS\""
Domain=[NARNIA] OS=[Unix] Server=[Samba 2.2.0-alpha3]
Successfully set hp-print to driver HP LaserJet 4000 Series PS.</PRE
></TD
></TR
></TABLE
></P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN860"
>6.2.4. Adding New Printers via the Windows NT APW</A
></H2
><P
>By default, Samba offers all printer shares defined in <TT
CLASS="FILENAME"
>smb.conf</TT
>
in the "Printers..." folder. Also existing in this folder is the Windows NT
Add Printer Wizard icon. The APW will be show only if</P
><P
></P
><UL
><LI
><P
>The connected user is able to successfully
execute an OpenPrinterEx(\\server) with administrative
privileges (i.e. root or <TT
CLASS="PARAMETER"
><I
>printer admin</I
></TT
>).
</P
></LI
><LI
><P
><A
HREF="smb.conf.5.html#SHOWADDPRINTERWIZARD"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
>show
add printer wizard = yes</I
></TT
></A
> (the default).
</P
></LI
></UL
><P
>In order to be able to use the APW to successfully add a printer to a Samba
server, the <A
HREF="smb.conf.5.html#ADDPRINTERCOMMAND"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
>add
printer command</I
></TT
></A
> must have a defined value. The program
hook must successfully add the printer to the system (i.e.
<TT
CLASS="FILENAME"
>/etc/printcap</TT
> or appropriate files) and
<TT
CLASS="FILENAME"
>smb.conf</TT
> if necessary.</P
><P
>When using the APW from a client, if the named printer share does
not exist, <B
CLASS="COMMAND"
>smbd</B
> will execute the <TT
CLASS="PARAMETER"
><I
>add printer
command</I
></TT
> and reparse to the <TT
CLASS="FILENAME"
>smb.conf</TT
>
to attempt to locate the new printer share. If the share is still not defined,
an error of "Access Denied" is returned to the client. Note that the
<TT
CLASS="PARAMETER"
><I
>add printer program</I
></TT
> is executed under the context
of the connected user, not necessarily a root account.</P
><P
>There is a complementing <A
HREF="smb.conf.5.html#DELETEPRINTERCOMMAND"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
>delete
printer command</I
></TT
></A
> for removing entries from the "Printers..."
folder.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN885"
>6.2.5. Samba and Printer Ports</A
></H2
><P
>Windows NT/2000 print servers associate a port with each printer. These normally
take the form of LPT1:, COM1:, FILE:, etc... Samba must also support the
concept of ports associated with a printer. By default, only one printer port,
named "Samba Printer Port", exists on a system. Samba does not really a port in
order to print, rather it is a requirement of Windows clients. </P
><P
>Note that Samba does not support the concept of "Printer Pooling" internally
either. This is when a logical printer is assigned to multiple ports as
a form of load balancing or fail over.</P
><P
>If you require that multiple ports be defined for some reason,
<TT
CLASS="FILENAME"
>smb.conf</TT
> possesses a <A
HREF="smb.conf.5.html#ENUMPORTSCOMMAND"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
>enumports
command</I
></TT
></A
> which can be used to define an external program
that generates a listing of ports on a system.</P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN893"
>6.3. The Imprints Toolset</A
></H1
><P
>The Imprints tool set provides a UNIX equivalent of the
Windows NT Add Printer Wizard. For complete information, please
refer to the Imprints web site at <A
HREF="http://imprints.sourceforge.net/"
TARGET="_top"
> http://imprints.sourceforge.net/</A
> as well as the documentation
included with the imprints source distribution. This section will
only provide a brief introduction to the features of Imprints.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN897"
>6.3.1. What is Imprints?</A
></H2
><P
>Imprints is a collection of tools for supporting the goals
of</P
><P
></P
><UL
><LI
><P
>Providing a central repository information
regarding Windows NT and 95/98 printer driver packages</P
></LI
><LI
><P
>Providing the tools necessary for creating
the Imprints printer driver packages.</P
></LI
><LI
><P
>Providing an installation client which
will obtain and install printer drivers on remote Samba
and Windows NT 4 print servers.</P
></LI
></UL
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN907"
>6.3.2. Creating Printer Driver Packages</A
></H2
><P
>The process of creating printer driver packages is beyond
the scope of this document (refer to Imprints.txt also included
with the Samba distribution for more information). In short,
an Imprints driver package is a gzipped tarball containing the
driver files, related INF files, and a control file needed by the
installation client.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN910"
>6.3.3. The Imprints server</A
></H2
><P
>The Imprints server is really a database server that
may be queried via standard HTTP mechanisms. Each printer
entry in the database has an associated URL for the actual
downloading of the package. Each package is digitally signed
via GnuPG which can be used to verify that package downloaded
is actually the one referred in the Imprints database. It is
<EM
>not</EM
> recommended that this security check
be disabled.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN914"
>6.3.4. The Installation Client</A
></H2
><P
>More information regarding the Imprints installation client
is available in the <TT
CLASS="FILENAME"
>Imprints-Client-HOWTO.ps</TT
>
file included with the imprints source package.</P
><P
>The Imprints installation client comes in two forms.</P
><P
></P
><UL
><LI
><P
>a set of command line Perl scripts</P
></LI
><LI
><P
>a GTK+ based graphical interface to
the command line perl scripts</P
></LI
></UL
><P
>The installation client (in both forms) provides a means
of querying the Imprints database server for a matching
list of known printer model names as well as a means to
download and install the drivers on remote Samba and Windows
NT print servers.</P
><P
>The basic installation process is in four steps and
perl code is wrapped around <B
CLASS="COMMAND"
>smbclient</B
>
and <B
CLASS="COMMAND"
>rpcclient</B
>.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>
foreach (supported architecture for a given driver)
{
1. rpcclient: Get the appropriate upload directory
on the remote server
2. smbclient: Upload the driver files
3. rpcclient: Issues an AddPrinterDriver() MS-RPC
}
4. rpcclient: Issue an AddPrinterEx() MS-RPC to actually
create the printer</PRE
></TD
></TR
></TABLE
></P
><P
>One of the problems encountered when implementing
the Imprints tool set was the name space issues between
various supported client architectures. For example, Windows
NT includes a driver named "Apple LaserWriter II NTX v51.8"
and Windows 95 calls its version of this driver "Apple
LaserWriter II NTX"</P
><P
>The problem is how to know what client drivers have
been uploaded for a printer. As astute reader will remember
that the Windows NT Printer Properties dialog only includes
space for one printer driver name. A quick look in the
Windows NT 4.0 system registry at</P
><P
><TT
CLASS="FILENAME"
>HKLM\System\CurrentControlSet\Control\Print\Environment
</TT
></P
><P
>will reveal that Windows NT always uses the NT driver
name. This is ok as Windows NT always requires that at least
the Windows NT version of the printer driver is present.
However, Samba does not have the requirement internally.
Therefore, how can you use the NT driver name if is has not
already been installed?</P
><P
>The way of sidestepping this limitation is to require
that all Imprints printer driver packages include both the Intel
Windows NT and 95/98 printer drivers and that NT driver is
installed first.</P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN936"
>6.4. <A
NAME="MIGRATION"
></A
>Migration to from Samba 2.0.x to 2.2.x</A
></H1
><P
>Given that printer driver management has changed (we hope improved) in
2.2 over prior releases, migration from an existing setup to 2.2 can
follow several paths. Here are the possible scenarios for
migration:</P
><P
></P
><UL
><LI
><P
>If you do not desire the new Windows NT
print driver support, nothing needs to be done.
All existing parameters work the same.</P
></LI
><LI
><P
>If you want to take advantage of NT printer
driver support but do not want to migrate the
9x drivers to the new setup, the leave the existing
<TT
CLASS="FILENAME"
>printers.def</TT
> file. When smbd attempts
to locate a
9x driver for the printer in the TDB and fails it
will drop down to using the printers.def (and all
associated parameters). The <B
CLASS="COMMAND"
>make_printerdef</B
>
tool will also remain for backwards compatibility but will
be removed in the next major release.</P
></LI
><LI
><P
>If you install a Windows 9x driver for a printer
on your Samba host (in the printing TDB), this information will
take precedence and the three old printing parameters
will be ignored (including print driver location).</P
></LI
><LI
><P
>If you want to migrate an existing <TT
CLASS="FILENAME"
>printers.def</TT
>
file into the new setup, the current only solution is to use the Windows
NT APW to install the NT drivers and the 9x drivers. This can be scripted
using <B
CLASS="COMMAND"
>smbclient</B
> and <B
CLASS="COMMAND"
>rpcclient</B
>. See the
Imprints installation client at <A
HREF="http://imprints.sourceforge.net/"
TARGET="_top"
>http://imprints.sourceforge.net/</A
>
for an example.
</P
></LI
></UL
><DIV
CLASS="WARNING"
><P
></P
><TABLE
CLASS="WARNING"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>Achtung!</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>The following <TT
CLASS="FILENAME"
>smb.conf</TT
> parameters are considered to
be deprecated and will be removed soon. Do not use them in new
installations</P
><P
></P
><UL
><LI
><P
><TT
CLASS="PARAMETER"
><I
>printer driver file (G)</I
></TT
>
</P
></LI
><LI
><P
><TT
CLASS="PARAMETER"
><I
>printer driver (S)</I
></TT
>
</P
></LI
><LI
><P
><TT
CLASS="PARAMETER"
><I
>printer driver location (S)</I
></TT
>
</P
></LI
></UL
></TD
></TR
></TABLE
></DIV
><P
>The have been two new parameters add in Samba 2.2.2 to for
better support of Samba 2.0.x backwards capability (<TT
CLASS="PARAMETER"
><I
>disable
spoolss</I
></TT
>) and for using local printers drivers on Windows
NT/2000 clients (<TT
CLASS="PARAMETER"
><I
>use client driver</I
></TT
>). Both of
these options are described in the smb.coinf(5) man page and are
disabled by default.</P
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="DOMAIN-SECURITY"
>Chapter 7. security = domain in Samba 2.x</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN990"
>7.1. Joining an NT Domain with Samba 2.2</A
></H1
><P
>Assume you have a Samba 2.x server with a NetBIOS name of
<TT
CLASS="CONSTANT"
>SERV1</TT
> and are joining an NT domain called
<TT
CLASS="CONSTANT"
>DOM</TT
>, which has a PDC with a NetBIOS name
of <TT
CLASS="CONSTANT"
>DOMPDC</TT
> and two backup domain controllers
with NetBIOS names <TT
CLASS="CONSTANT"
>DOMBDC1</TT
> and <TT
CLASS="CONSTANT"
>DOMBDC2
</TT
>.</P
><P
>In order to join the domain, first stop all Samba daemons
and run the command:</P
><P
><TT
CLASS="PROMPT"
>root# </TT
><TT
CLASS="USERINPUT"
><B
>smbpasswd -j DOM -r DOMPDC
-U<TT
CLASS="REPLACEABLE"
><I
>Administrator%password</I
></TT
></B
></TT
></P
><P
>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)
is DOMPDC. The <TT
CLASS="REPLACEABLE"
><I
>Administrator%password</I
></TT
> is
the login name and password for an account which has the necessary
privilege to add machines to the domain. If this is successful
you will see the message:</P
><P
><TT
CLASS="COMPUTEROUTPUT"
>smbpasswd: Joined domain DOM.</TT
>
</P
><P
>in your terminal window. See the <A
HREF="smbpasswd.8.html"
TARGET="_top"
> smbpasswd(8)</A
> man page for more details.</P
><P
>There is existing development code to join a domain
without having to create the machine trust account on the PDC
beforehand. This code will hopefully be available soon
in release branches as well.</P
><P
>This command goes through the machine account password
change protocol, then writes the new (random) machine account
password for this Samba server into a file in the same directory
in which an smbpasswd file would be stored - normally :</P
><P
><TT
CLASS="FILENAME"
>/usr/local/samba/private</TT
></P
><P
>In Samba 2.0.x, the filename looks like this:</P
><P
><TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
><NT DOMAIN NAME></I
></TT
>.<TT
CLASS="REPLACEABLE"
><I
><Samba
Server Name></I
></TT
>.mac</TT
></P
><P
>The <TT
CLASS="FILENAME"
>.mac</TT
> suffix stands for machine account
password file. So in our example above, the file would be called:</P
><P
><TT
CLASS="FILENAME"
>DOM.SERV1.mac</TT
></P
><P
>In Samba 2.2, this file has been replaced with a TDB
(Trivial Database) file named <TT
CLASS="FILENAME"
>secrets.tdb</TT
>.
</P
><P
>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
><P
>Now, before restarting the Samba daemons you must
edit your <A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
>smb.conf(5)</TT
>
</A
> file to tell Samba it should now use domain security.</P
><P
>Change (or add) your <A
HREF="smb.conf.5.html#SECURITY"
TARGET="_top"
> <TT
CLASS="PARAMETER"
><I
>security =</I
></TT
></A
> line in the [global] section
of your smb.conf to read:</P
><P
><B
CLASS="COMMAND"
>security = domain</B
></P
><P
>Next change the <A
HREF="smb.conf.5.html#WORKGROUP"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
> workgroup =</I
></TT
></A
> line in the [global] section to read: </P
><P
><B
CLASS="COMMAND"
>workgroup = DOM</B
></P
><P
>as this is the name of the domain we are joining. </P
><P
>You must also have the parameter <A
HREF="smb.conf.5.html#ENCRYPTPASSWORDS"
TARGET="_top"
> <TT
CLASS="PARAMETER"
><I
>encrypt passwords</I
></TT
></A
> set to <TT
CLASS="CONSTANT"
>yes
</TT
> in order for your users to authenticate to the NT PDC.</P
><P
>Finally, add (or modify) a <A
HREF="smb.conf.5.html#PASSWORDSERVER"
TARGET="_top"
> <TT
CLASS="PARAMETER"
><I
>password server =</I
></TT
></A
> line in the [global]
section to read: </P
><P
><B
CLASS="COMMAND"
>password server = DOMPDC DOMBDC1 DOMBDC2</B
></P
><P
>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
><P
>Alternatively, if you want smbd to automatically determine
the list of Domain controllers to use for authentication, you may
set this line to be :</P
><P
><B
CLASS="COMMAND"
>password server = *</B
></P
><P
>This method, which was introduced in Samba 2.0.6,
allows Samba to use exactly the same mechanism that NT does. This
method either broadcasts or uses a WINS database in order to
find domain controllers to authenticate against.</P
><P
>Finally, restart your Samba daemons and get ready for
clients to begin using domain security!</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1054"
>7.2. Samba and Windows 2000 Domains</A
></H1
><P
>Many people have asked regarding the state of Samba's ability to participate in
a Windows 2000 Domain. Samba 2.2 is able to act as a member server of a Windows
2000 domain operating in mixed or native mode.</P
><P
>There is much confusion between the circumstances that require a "mixed" mode
Win2k DC and a when this host can be switched to "native" mode. A "mixed" mode
Win2k domain controller is only needed if Windows NT BDCs must exist in the same
domain. By default, a Win2k DC in "native" mode will still support
NetBIOS and NTLMv1 for authentication of legacy clients such as Windows 9x and
NT 4.0. Samba has the same requirements as a Windows NT 4.0 member server.</P
><P
>The steps for adding a Samba 2.2 host to a Win2k domain are the same as those
for adding a Samba server to a Windows NT 4.0 domain. The only exception is that
the "Server Manager" from NT 4 has been replaced by the "Active Directory Users and
Computers" MMC (Microsoft Management Console) plugin.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1059"
>7.3. Why is this better than security = server?</A
></H1
><P
>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 <TT
CLASS="CONSTANT"
>DOM\fred
</TT
> 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#SECURITYEQUALSSERVER"
TARGET="_top"
>security = server</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
><P
>Please refer to the <A
HREF="winbind.html"
TARGET="_top"
>Winbind
paper</A
> for information on a system to automatically
assign UNIX uids and gids to Windows NT Domain users and groups.
This code is available in development branches only at the moment,
but will be moved to release branches soon.</P
><P
>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
><P
>In addition, with <B
CLASS="COMMAND"
>security = server</B
> 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 <B
CLASS="COMMAND"
>security = domain</B
>,
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
><P
>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
><P
><EM
>NOTE:</EM
> Much of the text of this document
was first published in the Web magazine <A
HREF="http://www.linuxworld.com"
TARGET="_top"
>
LinuxWorld</A
> as the article <A
HREF="http://www.linuxworld.com/linuxworld/lw-1998-10/lw-10-samba.html"
TARGET="_top"
>Doing
the NIS/NT Samba</A
>.</P
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="SAMBA-PDC"
>Chapter 8. How to Configure Samba 2.2 as a Primary Domain Controller</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN1092"
>8.1. Prerequisite Reading</A
></H1
><P
>Before you continue reading in this chapter, please make sure
that you are comfortable with configuring basic files services
in smb.conf and how to enable and administer password
encryption in Samba. Theses two topics are covered in the
<A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
>smb.conf(5)</TT
></A
>
manpage and the <A
HREF="ENCRYPTION.html"
TARGET="_top"
>Encryption chapter</A
>
of this HOWTO Collection.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1098"
>8.2. Background</A
></H1
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
><EM
>Author's Note:</EM
> This document is a combination
of David Bannon's "Samba 2.2 PDC HOWTO" and "Samba NT Domain FAQ".
Both documents are superseded by this one.</P
></BLOCKQUOTE
></DIV
><P
>Versions of Samba prior to release 2.2 had marginal capabilities to act
as a Windows NT 4.0 Primary Domain Controller
(PDC). With Samba 2.2.0, we are proud to announce official support for
Windows NT 4.0-style domain logons from Windows NT 4.0 and Windows
2000 clients. This article outlines the steps
necessary for configuring Samba as a PDC. It is necessary to have a
working Samba server prior to implementing the PDC functionality. If
you have not followed the steps outlined in <A
HREF="UNIX_INSTALL.html"
TARGET="_top"
> UNIX_INSTALL.html</A
>, please make sure
that your server is configured correctly before proceeding. Another
good resource in the <A
HREF="smb.conf.5.html"
TARGET="_top"
>smb.conf(5) man
page</A
>. The following functionality should work in 2.2:</P
><P
></P
><UL
><LI
><P
> domain logons for Windows NT 4.0/2000 clients.
</P
></LI
><LI
><P
> placing a Windows 9x client in user level security
</P
></LI
><LI
><P
> retrieving a list of users and groups from a Samba PDC to
Windows 9x/NT/2000 clients
</P
></LI
><LI
><P
> roving (roaming) user profiles
</P
></LI
><LI
><P
> Windows NT 4.0-style system policies
</P
></LI
></UL
><P
>The following pieces of functionality are not included in the 2.2 release:</P
><P
></P
><UL
><LI
><P
> Windows NT 4 domain trusts
</P
></LI
><LI
><P
> SAM replication with Windows NT 4.0 Domain Controllers
(i.e. a Samba PDC and a Windows NT BDC or vice versa)
</P
></LI
><LI
><P
> Adding users via the User Manager for Domains
</P
></LI
><LI
><P
> Acting as a Windows 2000 Domain Controller (i.e. Kerberos and
Active Directory)
</P
></LI
></UL
><P
>Please note that Windows 9x clients are not true members of a domain
for reasons outlined in this article. Therefore the protocol for
support Windows 9x-style domain logons is completely different
from NT4 domain logons and has been officially supported for some
time.</P
><P
>Implementing a Samba PDC can basically be divided into 2 broad
steps.</P
><P
></P
><OL
TYPE="1"
><LI
><P
> Configuring the Samba PDC
</P
></LI
><LI
><P
> Creating machine trust accounts and joining clients
to the domain
</P
></LI
></OL
><P
>There are other minor details such as user profiles, system
policies, etc... However, these are not necessarily specific
to a Samba PDC as much as they are related to Windows NT networking
concepts. They will be mentioned only briefly here.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1137"
>8.3. Configuring the Samba Domain Controller</A
></H1
><P
>The first step in creating a working Samba PDC is to
understand the parameters necessary in smb.conf. I will not
attempt to re-explain the parameters here as they are more that
adequately covered in <A
HREF="smb.conf.5.html"
TARGET="_top"
> the smb.conf
man page</A
>. For convenience, the parameters have been
linked with the actual smb.conf description.</P
><P
>Here is an example <TT
CLASS="FILENAME"
>smb.conf</TT
> for acting as a PDC:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>[global]
; Basic server settings
<A
HREF="smb.conf.5.html#NETBIOSNAME"
TARGET="_top"
>netbios name</A
> = <TT
CLASS="REPLACEABLE"
><I
>POGO</I
></TT
>
<A
HREF="smb.conf.5.html#WORKGROUP"
TARGET="_top"
>workgroup</A
> = <TT
CLASS="REPLACEABLE"
><I
>NARNIA</I
></TT
>
; we should act as the domain and local master browser
<A
HREF="smb.conf.5.html#OSLEVEL"
TARGET="_top"
>os level</A
> = 64
<A
HREF="smb.conf.5.html#PERFERREDMASTER"
TARGET="_top"
>preferred master</A
> = yes
<A
HREF="smb.conf.5.html#DOMAINMASTER"
TARGET="_top"
>domain master</A
> = yes
<A
HREF="smb.conf.5.html#LOCALMASTER"
TARGET="_top"
>local master</A
> = yes
; security settings (must user security = user)
<A
HREF="smb.conf.5.html#SECURITYEQUALSUSER"
TARGET="_top"
>security</A
> = user
; encrypted passwords are a requirement for a PDC
<A
HREF="smb.conf.5.html#ENCRYPTPASSWORDS"
TARGET="_top"
>encrypt passwords</A
> = yes
; support domain logons
<A
HREF="smb.conf.5.html#DOMAINLOGONS"
TARGET="_top"
>domain logons</A
> = yes
; where to store user profiles?
<A
HREF="smb.conf.5.html#LOGONPATH"
TARGET="_top"
>logon path</A
> = \\%N\profiles\%u
; where is a user's home directory and where should it
; be mounted at?
<A
HREF="smb.conf.5.html#LOGONDRIVE"
TARGET="_top"
>logon drive</A
> = H:
<A
HREF="smb.conf.5.html#LOGONHOME"
TARGET="_top"
>logon home</A
> = \\homeserver\%u
; specify a generic logon script for all users
; this is a relative **DOS** path to the [netlogon] share
<A
HREF="smb.conf.5.html#LOGONSCRIPT"
TARGET="_top"
>logon script</A
> = logon.cmd
; necessary share for domain controller
[netlogon]
<A
HREF="smb.conf.5.html#PATH"
TARGET="_top"
>path</A
> = /usr/local/samba/lib/netlogon
<A
HREF="smb.conf.5.html#READONLY"
TARGET="_top"
>read only</A
> = yes
<A
HREF="smb.conf.5.html#WRITELIST"
TARGET="_top"
>write list</A
> = <TT
CLASS="REPLACEABLE"
><I
>ntadmin</I
></TT
>
; share for storing user profiles
[profiles]
<A
HREF="smb.conf.5.html#PATH"
TARGET="_top"
>path</A
> = /export/smb/ntprofile
<A
HREF="smb.conf.5.html#READONLY"
TARGET="_top"
>read only</A
> = no
<A
HREF="smb.conf.5.html#CREATEMASK"
TARGET="_top"
>create mask</A
> = 0600
<A
HREF="smb.conf.5.html#DIRECTORYMASK"
TARGET="_top"
>directory mask</A
> = 0700</PRE
></TD
></TR
></TABLE
></P
><P
>There are a couple of points to emphasize in the above configuration.</P
><P
></P
><UL
><LI
><P
> Encrypted passwords must be enabled. For more details on how
to do this, refer to <A
HREF="ENCRYPTION.html"
TARGET="_top"
>ENCRYPTION.html</A
>.
</P
></LI
><LI
><P
> The server must support domain logons and a
<TT
CLASS="FILENAME"
>[netlogon]</TT
> share
</P
></LI
><LI
><P
> The server must be the domain master browser in order for Windows
client to locate the server as a DC. Please refer to the various
Network Browsing documentation included with this distribution for
details.
</P
></LI
></UL
><P
>As Samba 2.2 does not offer a complete implementation of group mapping
between Windows NT groups and Unix groups (this is really quite
complicated to explain in a short space), you should refer to the
<A
HREF="smb.conf.5.html#DOMAINADMINGROUP"
TARGET="_top"
>domain admin
group</A
> smb.conf parameter for information of creating "Domain
Admins" style accounts.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1180"
>8.4. Creating Machine Trust Accounts and Joining Clients to the
Domain</A
></H1
><P
>A machine trust account is a Samba account that is used to
authenticate a client machine (rather than a user) to the Samba
server. In Windows terminology, this is known as a "Computer
Account."</P
><P
>The password of a machine trust account acts as the shared secret for
secure communication with the Domain Controller. This is a security
feature to prevent an unauthorized machine with the same NetBIOS name
from joining the domain and gaining access to domain user/group
accounts. Windows NT and 2000 clients use machine trust accounts, but
Windows 9x clients do not. Hence, a Windows 9x client is never a true
member of a domain because it does not possess a machine trust
account, and thus has no shared secret with the domain controller.</P
><P
>A Windows PDC stores each machine trust account in the Windows
Registry. A Samba PDC, however, stores each machine trust account
in two parts, as follows:
<P
></P
><UL
><LI
><P
>A Samba account, stored in the same location as user
LanMan and NT password hashes (currently
<TT
CLASS="FILENAME"
>smbpasswd</TT
>). The Samba account
possesses and uses only the NT password hash.</P
></LI
><LI
><P
>A corresponding Unix account, typically stored in
<TT
CLASS="FILENAME"
>/etc/passwd</TT
>. (Future releases will alleviate the need to
create <TT
CLASS="FILENAME"
>/etc/passwd</TT
> entries.) </P
></LI
></UL
></P
><P
>There are two ways to create machine trust accounts:</P
><P
></P
><UL
><LI
><P
> Manual creation. Both the Samba and corresponding
Unix account are created by hand.</P
></LI
><LI
><P
> "On-the-fly" creation. The Samba machine trust
account is automatically created by Samba at the time the client
is joined to the domain. (For security, this is the
recommended method.) The corresponding Unix account may be
created automatically or manually. </P
></LI
></UL
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1199"
>8.4.1. Manual Creation of Machine Trust Accounts</A
></H2
><P
>The first step in manually creating a machine trust account is to
manually create the corresponding Unix account in
<TT
CLASS="FILENAME"
>/etc/passwd</TT
>. This can be done using
<B
CLASS="COMMAND"
>vipw</B
> or other 'add user' command that is normally
used to create new Unix accounts. The following is an example for a
Linux based Samba server:</P
><P
> <TT
CLASS="PROMPT"
>root# </TT
><B
CLASS="COMMAND"
>/usr/sbin/useradd -g 100 -d /dev/null -c <TT
CLASS="REPLACEABLE"
><I
>"machine
nickname"</I
></TT
> -s /bin/false <TT
CLASS="REPLACEABLE"
><I
>machine_name</I
></TT
>$ </B
></P
><P
><TT
CLASS="PROMPT"
>root# </TT
><B
CLASS="COMMAND"
>passwd -l <TT
CLASS="REPLACEABLE"
><I
>machine_name</I
></TT
>$</B
></P
><P
>The <TT
CLASS="FILENAME"
>/etc/passwd</TT
> entry will list the machine name
with a "$" appended, won't have a password, will have a null shell and no
home directory. For example a machine named 'doppy' would have an
<TT
CLASS="FILENAME"
>/etc/passwd</TT
> entry like this:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>doppy$:x:505:501:<TT
CLASS="REPLACEABLE"
><I
>machine_nickname</I
></TT
>:/dev/null:/bin/false</PRE
></TD
></TR
></TABLE
></P
><P
>Above, <TT
CLASS="REPLACEABLE"
><I
>machine_nickname</I
></TT
> can be any
descriptive name for the client, i.e., BasementComputer.
<TT
CLASS="REPLACEABLE"
><I
>machine_name</I
></TT
> absolutely must be the NetBIOS
name of the client to be joined to the domain. The "$" must be
appended to the NetBIOS name of the client or Samba will not recognize
this as a machine trust account.</P
><P
>Now that the corresponding Unix account has been created, the next step is to create
the Samba account for the client containing the well-known initial
machine trust account password. This can be done using the <A
HREF="smbpasswd.8.html"
TARGET="_top"
><B
CLASS="COMMAND"
>smbpasswd(8)</B
></A
> command
as shown here:</P
><P
><TT
CLASS="PROMPT"
>root# </TT
><B
CLASS="COMMAND"
>smbpasswd -a -m <TT
CLASS="REPLACEABLE"
><I
>machine_name</I
></TT
></B
></P
><P
>where <TT
CLASS="REPLACEABLE"
><I
>machine_name</I
></TT
> is the machine's NetBIOS
name. The RID of the new machine account is generated from the UID of
the corresponding Unix account.</P
><DIV
CLASS="WARNING"
><P
></P
><TABLE
CLASS="WARNING"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>Join the client to the domain immediately</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
> Manually creating a machine trust account using this method is the
equivalent of creating a machine trust account on a Windows NT PDC using
the "Server Manager". From the time at which the account is created
to the time which the client joins the domain and changes the password,
your domain is vulnerable to an intruder joining your domain using a
a machine with the same NetBIOS name. A PDC inherently trusts
members of the domain and will serve out a large degree of user
information to such clients. You have been warned!
</P
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1234"
>8.4.2. "On-the-Fly" Creation of Machine Trust Accounts</A
></H2
><P
>The second (and recommended) way of creating machine trust accounts is
simply to allow the Samba server to create them as needed when the client
is joined to the domain. </P
><P
>Since each Samba machine trust account requires a corresponding
Unix account, a method for automatically creating the
Unix account is usually supplied; this requires configuration of the
<A
HREF="smb.conf.5.html#ADDUSERSCRIPT"
TARGET="_top"
>add user script</A
>
option in <TT
CLASS="FILENAME"
>smb.conf</TT
>. This
method is not required, however; corresponding Unix accounts may also
be created manually.</P
><P
>Below is an example for a RedHat 6.2 Linux system.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>[global]
# <...remainder of parameters...>
add user script = /usr/sbin/useradd -d /dev/null -g 100 -s /bin/false -M %u </PRE
></TD
></TR
></TABLE
></P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1243"
>8.4.3. Joining the Client to the Domain</A
></H2
><P
>The procedure for joining a client to the domain varies with the
version of Windows.</P
><P
></P
><UL
><LI
><P
><EM
>Windows 2000</EM
></P
><P
> When the user elects to join the client to a domain, Windows prompts for
an account and password that is privileged to join the domain. A
Samba administrative account (i.e., a Samba account that has root
privileges on the Samba server) must be entered here; the
operation will fail if an ordinary user account is given.
The password for this account should be
set to a different password than the associated
<TT
CLASS="FILENAME"
>/etc/passwd</TT
> entry, for security
reasons. </P
><P
>The session key of the Samba administrative account acts as an
encryption key for setting the password of the machine trust
account. The machine trust account will be created on-the-fly, or
updated if it already exists.</P
></LI
><LI
><P
><EM
>Windows NT</EM
></P
><P
> If the machine trust account was created manually, on the
Identification Changes menu enter the domain name, but do not
check the box "Create a Computer Account in the Domain." In this case,
the existing machine trust account is used to join the machine to
the domain.</P
><P
> If the machine trust account is to be created
on-the-fly, on the Identification Changes menu enter the domain
name, and check the box "Create a Computer Account in the Domain." In
this case, joining the domain proceeds as above for Windows 2000
(i.e., you must supply a Samba administrative account when
prompted).</P
></LI
></UL
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1258"
>8.5. Common Problems and Errors</A
></H1
><P
></P
><P
></P
><UL
><LI
><P
> <EM
>I cannot include a '$' in a machine name.</EM
>
</P
><P
> A 'machine name' in (typically) <TT
CLASS="FILENAME"
>/etc/passwd</TT
>
of the machine name with a '$' appended. FreeBSD (and other BSD
systems?) won't create a user with a '$' in their name.
</P
><P
> The problem is only in the program used to make the entry, once
made, it works perfectly. So create a user without the '$' and
use <B
CLASS="COMMAND"
>vipw</B
> to edit the entry, adding the '$'. Or create
the whole entry with vipw if you like, make sure you use a
unique User ID !
</P
></LI
><LI
><P
> <EM
>I get told "You already have a connection to the Domain...."
or "Cannot join domain, the credentials supplied conflict with an
existing set.." when creating a machine trust account.</EM
>
</P
><P
> This happens if you try to create a machine trust account from the
machine itself and already have a connection (e.g. mapped drive)
to a share (or IPC$) on the Samba PDC. The following command
will remove all network drive connections:
</P
><P
> <TT
CLASS="PROMPT"
>C:\WINNT\></TT
> <B
CLASS="COMMAND"
>net use * /d</B
>
</P
><P
> Further, if the machine is a already a 'member of a workgroup' that
is the same name as the domain you are joining (bad idea) you will
get this message. Change the workgroup name to something else, it
does not matter what, reboot, and try again.
</P
></LI
><LI
><P
> <EM
>The system can not log you on (C000019B)....</EM
>
</P
><P
>I joined the domain successfully but after upgrading
to a newer version of the Samba code I get the message, "The system
can not log you on (C000019B), Please try a gain or consult your
system administrator" when attempting to logon.
</P
><P
> This occurs when the domain SID stored in
<TT
CLASS="FILENAME"
>private/WORKGROUP.SID</TT
> is
changed. For example, you remove the file and <B
CLASS="COMMAND"
>smbd</B
> automatically
creates a new one. Or you are swapping back and forth between
versions 2.0.7, TNG and the HEAD branch code (not recommended). The
only way to correct the problem is to restore the original domain
SID or remove the domain client from the domain and rejoin.
</P
></LI
><LI
><P
> <EM
>The machine trust account for this computer either does not
exist or is not accessible.</EM
>
</P
><P
> When I try to join the domain I get the message "The machine account
for this computer either does not exist or is not accessible". What's
wrong?
</P
><P
> This problem is caused by the PDC not having a suitable machine trust account.
If you are using the <TT
CLASS="PARAMETER"
><I
>add user script</I
></TT
> method to create
accounts then this would indicate that it has not worked. Ensure the domain
admin user system is working.
</P
><P
> Alternatively if you are creating account entries manually then they
have not been created correctly. Make sure that you have the entry
correct for the machine trust account in smbpasswd file on the Samba PDC.
If you added the account using an editor rather than using the smbpasswd
utility, make sure that the account name is the machine NetBIOS name
with a '$' appended to it ( i.e. computer_name$ ). There must be an entry
in both /etc/passwd and the smbpasswd file. Some people have reported
that inconsistent subnet masks between the Samba server and the NT
client have caused this problem. Make sure that these are consistent
for both client and server.
</P
></LI
><LI
><P
> <EM
>When I attempt to login to a Samba Domain from a NT4/W2K workstation,
I get a message about my account being disabled.</EM
>
</P
><P
> This problem is caused by a PAM related bug in Samba 2.2.0. This bug is
fixed in 2.2.1. Other symptoms could be unaccessible shares on
NT/W2K member servers in the domain or the following error in your smbd.log:
passdb/pampass.c:pam_account(268) PAM: UNKNOWN ERROR for User: %user%
</P
><P
> At first be ensure to enable the useraccounts with <B
CLASS="COMMAND"
>smbpasswd -e
%user%</B
>, this is normally done, when you create an account.
</P
><P
> In order to work around this problem in 2.2.0, configure the
<TT
CLASS="PARAMETER"
><I
>account</I
></TT
> control flag in
<TT
CLASS="FILENAME"
>/etc/pam.d/samba</TT
> file as follows:
</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="90%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> account required pam_permit.so
</PRE
></TD
></TR
></TABLE
></P
><P
> If you want to remain backward compatibility to samba 2.0.x use
<TT
CLASS="FILENAME"
>pam_permit.so</TT
>, it's also possible to use
<TT
CLASS="FILENAME"
>pam_pwdb.so</TT
>. There are some bugs if you try to
use <TT
CLASS="FILENAME"
>pam_unix.so</TT
>, if you need this, be ensure to use
the most recent version of this file.
</P
></LI
></UL
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1306"
>8.6. System Policies and Profiles</A
></H1
><P
>Much of the information necessary to implement System Policies and
Roving User Profiles in a Samba domain is the same as that for
implementing these same items in a Windows NT 4.0 domain.
You should read the white paper <A
HREF="http://www.microsoft.com/ntserver/management/deployment/planguide/prof_policies.asp"
TARGET="_top"
>Implementing
Profiles and Policies in Windows NT 4.0</A
> available from Microsoft.</P
><P
>Here are some additional details:</P
><P
></P
><UL
><LI
><P
> <EM
>What about Windows NT Policy Editor?</EM
>
</P
><P
> To create or edit <TT
CLASS="FILENAME"
>ntconfig.pol</TT
> you must use
the NT Server Policy Editor, <B
CLASS="COMMAND"
>poledit.exe</B
> which
is included with NT Server but <EM
>not NT Workstation</EM
>.
There is a Policy Editor on a NTws
but it is not suitable for creating <EM
>Domain Policies</EM
>.
Further, although the Windows 95
Policy Editor can be installed on an NT Workstation/Server, it will not
work with NT policies because the registry key that are set by the policy templates.
However, the files from the NT Server will run happily enough on an NTws.
You need <TT
CLASS="FILENAME"
>poledit.exe, common.adm</TT
> and <TT
CLASS="FILENAME"
>winnt.adm</TT
>. It is convenient
to put the two *.adm files in <TT
CLASS="FILENAME"
>c:\winnt\inf</TT
> which is where
the binary will look for them unless told otherwise. Note also that that
directory is 'hidden'.
</P
><P
> The Windows NT policy editor is also included with the Service Pack 3 (and
later) for Windows NT 4.0. Extract the files using <B
CLASS="COMMAND"
>servicepackname /x</B
>,
i.e. that's <B
CLASS="COMMAND"
>Nt4sp6ai.exe /x</B
> for service pack 6a. The policy editor,
<B
CLASS="COMMAND"
>poledit.exe</B
> and the associated template files (*.adm) should
be extracted as well. It is also possible to downloaded the policy template
files for Office97 and get a copy of the policy editor. Another possible
location is with the Zero Administration Kit available for download from Microsoft.
</P
></LI
><LI
><P
> <EM
>Can Win95 do Policies?</EM
>
</P
><P
> Install the group policy handler for Win9x to pick up group
policies. Look on the Win98 CD in <TT
CLASS="FILENAME"
>\tools\reskit\netadmin\poledit</TT
>.
Install group policies on a Win9x client by double-clicking
<TT
CLASS="FILENAME"
>grouppol.inf</TT
>. Log off and on again a couple of
times and see if Win98 picks up group policies. Unfortunately this needs
to be done on every Win9x machine that uses group policies....
</P
><P
> If group policies don't work one reports suggests getting the updated
(read: working) grouppol.dll for Windows 9x. The group list is grabbed
from /etc/group.
</P
></LI
><LI
><P
> <EM
>How do I get 'User Manager' and 'Server Manager'</EM
>
</P
><P
> Since I don't need to buy an NT Server CD now, how do I get
the 'User Manager for Domains', the 'Server Manager'?
</P
><P
> Microsoft distributes a version of these tools called nexus for
installation on Windows 95 systems. The tools set includes
</P
><P
></P
><UL
><LI
><P
>Server Manager</P
></LI
><LI
><P
>User Manager for Domains</P
></LI
><LI
><P
>Event Viewer</P
></LI
></UL
><P
> Click here to download the archived file <A
HREF="ftp://ftp.microsoft.com/Softlib/MSLFILES/NEXUS.EXE"
TARGET="_top"
>ftp://ftp.microsoft.com/Softlib/MSLFILES/NEXUS.EXE</A
>
</P
><P
> The Windows NT 4.0 version of the 'User Manager for
Domains' and 'Server Manager' are available from Microsoft via ftp
from <A
HREF="ftp://ftp.microsoft.com/Softlib/MSLFILES/SRVTOOLS.EXE"
TARGET="_top"
>ftp://ftp.microsoft.com/Softlib/MSLFILES/SRVTOOLS.EXE</A
>
</P
></LI
></UL
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1350"
>8.7. What other help can I get?</A
></H1
><P
>There are many sources of information available in the form
of mailing lists, RFC's and documentation. The docs that come
with the samba distribution contain very good explanations of
general SMB topics such as browsing.</P
><P
></P
><UL
><LI
><P
> <EM
>What are some diagnostics tools I can use to debug the domain logon
process and where can I find them?</EM
>
</P
><P
> One of the best diagnostic tools for debugging problems is Samba itself.
You can use the -d option for both smbd and nmbd to specify what
'debug level' at which to run. See the man pages on smbd, nmbd and
smb.conf for more information on debugging options. The debug
level can range from 1 (the default) to 10 (100 for debugging passwords).
</P
><P
> Another helpful method of debugging is to compile samba using the
<B
CLASS="COMMAND"
>gcc -g </B
> flag. This will include debug
information in the binaries and allow you to attach gdb to the
running smbd / nmbd process. In order to attach gdb to an smbd
process for an NT workstation, first get the workstation to make the
connection. Pressing ctrl-alt-delete and going down to the domain box
is sufficient (at least, on the first time you join the domain) to
generate a 'LsaEnumTrustedDomains'. Thereafter, the workstation
maintains an open connection, and therefore there will be an smbd
process running (assuming that you haven't set a really short smbd
idle timeout) So, in between pressing ctrl alt delete, and actually
typing in your password, you can gdb attach and continue.
</P
><P
> Some useful samba commands worth investigating:
</P
><P
></P
><UL
><LI
><P
>testparam | more</P
></LI
><LI
><P
>smbclient -L //{netbios name of server}</P
></LI
></UL
><P
> An SMB enabled version of tcpdump is available from
<A
HREF="http://www.tcpdump.org/"
TARGET="_top"
>http://www.tcpdup.org/</A
>.
Ethereal, another good packet sniffer for Unix and Win32
hosts, can be downloaded from <A
HREF="http://www.ethereal.com/"
TARGET="_top"
>http://www.ethereal.com</A
>.
</P
><P
> For tracing things on the Microsoft Windows NT, Network Monitor
(aka. netmon) is available on the Microsoft Developer Network CD's,
the Windows NT Server install CD and the SMS CD's. The version of
netmon that ships with SMS allows for dumping packets between any two
computers (i.e. placing the network interface in promiscuous mode).
The version on the NT Server install CD will only allow monitoring
of network traffic directed to the local NT box and broadcasts on the
local subnet. Be aware that Ethereal can read and write netmon
formatted files.
</P
></LI
><LI
><P
> <EM
>How do I install 'Network Monitor' on an NT Workstation
or a Windows 9x box?</EM
>
</P
><P
> Installing netmon on an NT workstation requires a couple
of steps. The following are for installing Netmon V4.00.349, which comes
with Microsoft Windows NT Server 4.0, on Microsoft Windows NT
Workstation 4.0. The process should be similar for other version of
Windows NT / Netmon. You will need both the Microsoft Windows
NT Server 4.0 Install CD and the Workstation 4.0 Install CD.
</P
><P
> Initially you will need to install 'Network Monitor Tools and Agent'
on the NT Server. To do this
</P
><P
></P
><UL
><LI
><P
>Goto Start - Settings - Control Panel -
Network - Services - Add </P
></LI
><LI
><P
>Select the 'Network Monitor Tools and Agent' and
click on 'OK'.</P
></LI
><LI
><P
>Click 'OK' on the Network Control Panel.
</P
></LI
><LI
><P
>Insert the Windows NT Server 4.0 install CD
when prompted.</P
></LI
></UL
><P
> At this point the Netmon files should exist in
<TT
CLASS="FILENAME"
>%SYSTEMROOT%\System32\netmon\*.*</TT
>.
Two subdirectories exist as well, <TT
CLASS="FILENAME"
>parsers\</TT
>
which contains the necessary DLL's for parsing the netmon packet
dump, and <TT
CLASS="FILENAME"
>captures\</TT
>.
</P
><P
> In order to install the Netmon tools on an NT Workstation, you will
first need to install the 'Network Monitor Agent' from the Workstation
install CD.
</P
><P
></P
><UL
><LI
><P
>Goto Start - Settings - Control Panel -
Network - Services - Add</P
></LI
><LI
><P
>Select the 'Network Monitor Agent' and click
on 'OK'.</P
></LI
><LI
><P
>Click 'OK' on the Network Control Panel.
</P
></LI
><LI
><P
>Insert the Windows NT Workstation 4.0 install
CD when prompted.</P
></LI
></UL
><P
> Now copy the files from the NT Server in %SYSTEMROOT%\System32\netmon\*.*
to %SYSTEMROOT%\System32\netmon\*.* on the Workstation and set
permissions as you deem appropriate for your site. You will need
administrative rights on the NT box to run netmon.
</P
><P
> To install Netmon on a Windows 9x box install the network monitor agent
from the Windows 9x CD (\admin\nettools\netmon). There is a readme
file located with the netmon driver files on the CD if you need
information on how to do this. Copy the files from a working
Netmon installation.
</P
></LI
><LI
><P
> The following is a list if helpful URLs and other links:
</P
><P
></P
><UL
><LI
><P
>Home of Samba site <A
HREF="http://samba.org"
TARGET="_top"
> http://samba.org</A
>. We have a mirror near you !</P
></LI
><LI
><P
> The <EM
>Development</EM
> document
on the Samba mirrors might mention your problem. If so,
it might mean that the developers are working on it.</P
></LI
><LI
><P
>See how Scott Merrill simulates a BDC behavior at
<A
HREF="http://www.skippy.net/linux/smb-howto.html"
TARGET="_top"
> http://www.skippy.net/linux/smb-howto.html</A
>. </P
></LI
><LI
><P
>Although 2.0.7 has almost had its day as a PDC, David Bannon will
keep the 2.0.7 PDC pages at <A
HREF="http://bioserve.latrobe.edu.au/samba"
TARGET="_top"
> http://bioserve.latrobe.edu.au/samba</A
> going for a while yet.</P
></LI
><LI
><P
>Misc links to CIFS information
<A
HREF="http://samba.org/cifs/"
TARGET="_top"
>http://samba.org/cifs/</A
></P
></LI
><LI
><P
>NT Domains for Unix <A
HREF="http://mailhost.cb1.com/~lkcl/ntdom/"
TARGET="_top"
> http://mailhost.cb1.com/~lkcl/ntdom/</A
></P
></LI
><LI
><P
>FTP site for older SMB specs:
<A
HREF="ftp://ftp.microsoft.com/developr/drg/CIFS/"
TARGET="_top"
> ftp://ftp.microsoft.com/developr/drg/CIFS/</A
></P
></LI
></UL
></LI
></UL
><P
></P
><UL
><LI
><P
> <EM
>How do I get help from the mailing lists?</EM
>
</P
><P
> There are a number of Samba related mailing lists. Go to <A
HREF="http://samba.org"
TARGET="_top"
>http://samba.org</A
>, click on your nearest mirror
and then click on <B
CLASS="COMMAND"
>Support</B
> and then click on <B
CLASS="COMMAND"
> Samba related mailing lists</B
>.
</P
><P
> For questions relating to Samba TNG go to
<A
HREF="http://www.samba-tng.org/"
TARGET="_top"
>http://www.samba-tng.org/</A
>
It has been requested that you don't post questions about Samba-TNG to the
main stream Samba lists.</P
><P
> If you post a message to one of the lists please observe the following guide lines :
</P
><P
></P
><UL
><LI
><P
> Always remember that the developers are volunteers, they are
not paid and they never guarantee to produce a particular feature at
a particular time. Any time lines are 'best guess' and nothing more.
</P
></LI
><LI
><P
> Always mention what version of samba you are using and what
operating system its running under. You should probably list the
relevant sections of your smb.conf file, at least the options
in [global] that affect PDC support.</P
></LI
><LI
><P
>In addition to the version, if you obtained Samba via
CVS mention the date when you last checked it out.</P
></LI
><LI
><P
> Try and make your question clear and brief, lots of long,
convoluted questions get deleted before they are completely read !
Don't post html encoded messages (if you can select colour or font
size its html).</P
></LI
><LI
><P
> If you run one of those nifty 'I'm on holidays' things when
you are away, make sure its configured to not answer mailing lists.
</P
></LI
><LI
><P
> Don't cross post. Work out which is the best list to post to
and see what happens, i.e. don't post to both samba-ntdom and samba-technical.
Many people active on the lists subscribe to more
than one list and get annoyed to see the same message two or more times.
Often someone will see a message and thinking it would be better dealt
with on another, will forward it on for you.</P
></LI
><LI
><P
>You might include <EM
>partial</EM
>
log files written at a debug level set to as much as 20.
Please don't send the entire log but enough to give the context of the
error messages.</P
></LI
><LI
><P
>(Possibly) If you have a complete netmon trace ( from the opening of
the pipe to the error ) you can send the *.CAP file as well.</P
></LI
><LI
><P
>Please think carefully before attaching a document to an email.
Consider pasting the relevant parts into the body of the message. The samba
mailing lists go to a huge number of people, do they all need a copy of your
smb.conf in their attach directory?</P
></LI
></UL
></LI
><LI
><P
> <EM
>How do I get off the mailing lists?</EM
>
</P
><P
>To have your name removed from a samba mailing list, go to the
same place you went to to get on it. Go to <A
HREF="http://lists.samba.org/"
TARGET="_top"
>http://lists.samba.org</A
>,
click on your nearest mirror and then click on <B
CLASS="COMMAND"
>Support</B
> and
then click on <B
CLASS="COMMAND"
> Samba related mailing lists</B
>. Or perhaps see
<A
HREF="http://lists.samba.org/mailman/roster/samba-ntdom"
TARGET="_top"
>here</A
>
</P
><P
> Please don't post messages to the list asking to be removed, you will just
be referred to the above address (unless that process failed in some way...)
</P
></LI
></UL
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1464"
>8.8. Domain Control for Windows 9x/ME</A
></H1
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>The following section contains much of the original
DOMAIN.txt file previously included with Samba. Much of
the material is based on what went into the book <EM
>Special
Edition, Using Samba</EM
>, by Richard Sharpe.</P
></BLOCKQUOTE
></DIV
><P
>A domain and a workgroup are exactly the same thing in terms of network
browsing. The difference is that a distributable authentication
database is associated with a domain, for secure login access to a
network. Also, different access rights can be granted to users if they
successfully authenticate against a domain logon server (NT server and
other systems based on NT server support this, as does at least Samba TNG now).</P
><P
>The SMB client logging on to a domain has an expectation that every other
server in the domain should accept the same authentication information.
Network browsing functionality of domains and workgroups is
identical and is explained in BROWSING.txt. It should be noted, that browsing
is totally orthogonal to logon support.</P
><P
>Issues related to the single-logon network model are discussed in this
section. Samba supports domain logons, network logon scripts, and user
profiles for MS Windows for workgroups and MS Windows 9X/ME clients
which will be the focus of this section.</P
><P
>When an SMB client in a domain wishes to logon it broadcast requests for a
logon server. The first one to reply gets the job, and validates its
password using whatever mechanism the Samba administrator has installed.
It is possible (but very stupid) to create a domain where the user
database is not shared between servers, i.e. they are effectively workgroup
servers advertising themselves as participating in a domain. This
demonstrates how authentication is quite different from but closely
involved with domains.</P
><P
>Using these features you can make your clients verify their logon via
the Samba server; make clients run a batch file when they logon to
the network and download their preferences, desktop and start menu.</P
><P
>Before launching into the configuration instructions, it is
worthwhile lookingat how a Windows 9x/ME client performs a logon:</P
><P
></P
><OL
TYPE="1"
><LI
><P
> The client broadcasts (to the IP broadcast address of the subnet it is in)
a NetLogon request. This is sent to the NetBIOS name DOMAIN<1c> at the
NetBIOS layer. The client chooses the first response it receives, which
contains the NetBIOS name of the logon server to use in the format of
\\SERVER.
</P
></LI
><LI
><P
> The client then connects to that server, logs on (does an SMBsessetupX) and
then connects to the IPC$ share (using an SMBtconX).
</P
></LI
><LI
><P
> The client then does a NetWkstaUserLogon request, which retrieves the name
of the user's logon script.
</P
></LI
><LI
><P
> The client then connects to the NetLogon share and searches for this
and if it is found and can be read, is retrieved and executed by the client.
After this, the client disconnects from the NetLogon share.
</P
></LI
><LI
><P
> The client then sends a NetUserGetInfo request to the server, to retrieve
the user's home share, which is used to search for profiles. Since the
response to the NetUserGetInfo request does not contain much more
the user's home share, profiles for Win9X clients MUST reside in the user
home directory.
</P
></LI
><LI
><P
> The client then connects to the user's home share and searches for the
user's profile. As it turns out, you can specify the user's home share as
a sharename and path. For example, \\server\fred\.profile.
If the profiles are found, they are implemented.
</P
></LI
><LI
><P
> The client then disconnects from the user's home share, and reconnects to
the NetLogon share and looks for CONFIG.POL, the policies file. If this is
found, it is read and implemented.
</P
></LI
></OL
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1490"
>8.8.1. Configuration Instructions: Network Logons</A
></H2
><P
>The main difference between a PDC and a Windows 9x logon
server configuration is that</P
><P
></P
><UL
><LI
><P
>Password encryption is not required for a Windows 9x logon server.</P
></LI
><LI
><P
>Windows 9x/ME clients do not possess machine trust accounts.</P
></LI
></UL
><P
>Therefore, a Samba PDC will also act as a Windows 9x logon
server.</P
><DIV
CLASS="WARNING"
><P
></P
><TABLE
CLASS="WARNING"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>security mode and master browsers</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>There are a few comments to make in order to tie up some
loose ends. There has been much debate over the issue of whether
or not it is ok to configure Samba as a Domain Controller in security
modes other than <TT
CLASS="CONSTANT"
>USER</TT
>. The only security mode
which will not work due to technical reasons is <TT
CLASS="CONSTANT"
>SHARE</TT
>
mode security. <TT
CLASS="CONSTANT"
>DOMAIN</TT
> and <TT
CLASS="CONSTANT"
>SERVER</TT
>
mode security is really just a variation on SMB user level security.</P
><P
>Actually, this issue is also closely tied to the debate on whether
or not Samba must be the domain master browser for its workgroup
when operating as a DC. While it may technically be possible
to configure a server as such (after all, browsing and domain logons
are two distinctly different functions), it is not a good idea to
so. You should remember that the DC must register the DOMAIN#1b NetBIOS
name. This is the name used by Windows clients to locate the DC.
Windows clients do not distinguish between the DC and the DMB.
For this reason, it is very wise to configure the Samba DC as the DMB.</P
><P
>Now back to the issue of configuring a Samba DC to use a mode other
than "security = user". If a Samba host is configured to use
another SMB server or DC in order to validate user connection
requests, then it is a fact that some other machine on the network
(the "password server") knows more about user than the Samba host.
99% of the time, this other host is a domain controller. Now
in order to operate in domain mode security, the "workgroup" parameter
must be set to the name of the Windows NT domain (which already
has a domain controller, right?)</P
><P
>Therefore configuring a Samba box as a DC for a domain that
already by definition has a PDC is asking for trouble.
Therefore, you should always configure the Samba DC to be the DMB
for its domain.</P
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1509"
>8.8.2. Configuration Instructions: Setting up Roaming User Profiles</A
></H2
><DIV
CLASS="WARNING"
><P
></P
><TABLE
CLASS="WARNING"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>Warning</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
><EM
>NOTE!</EM
> Roaming profiles support is different
for Win9X and WinNT.</P
></TD
></TR
></TABLE
></DIV
><P
>Before discussing how to configure roaming profiles, it is useful to see how
Win9X and WinNT clients implement these features.</P
><P
>Win9X clients send a NetUserGetInfo request to the server to get the user's
profiles location. However, the response does not have room for a separate
profiles location field, only the user's home share. This means that Win9X
profiles are restricted to being in the user's home directory.</P
><P
>WinNT clients send a NetSAMLogon RPC request, which contains many fields,
including a separate field for the location of the user's profiles.
This means that support for profiles is different for Win9X and WinNT.</P
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1517"
>8.8.2.1. Windows NT Configuration</A
></H3
><P
>To support WinNT clients, in the [global] section of smb.conf set the
following (for example):</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>logon path = \\profileserver\profileshare\profilepath\%U\moreprofilepath</PRE
></TD
></TR
></TABLE
></P
><P
>The default for this option is \\%N\%U\profile, namely
\\sambaserver\username\profile. The \\N%\%U service is created
automatically by the [homes] service.
If you are using a samba server for the profiles, you _must_ make the
share specified in the logon path browseable. </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>[lkcl 26aug96 - we have discovered a problem where Windows clients can
maintain a connection to the [homes] share in between logins. The
[homes] share must NOT therefore be used in a profile path.]</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1525"
>8.8.2.2. Windows 9X Configuration</A
></H3
><P
>To support Win9X clients, you must use the "logon home" parameter. Samba has
now been fixed so that "net use/home" now works as well, and it, too, relies
on the "logon home" parameter.</P
><P
>By using the logon home parameter, you are restricted to putting Win9X
profiles in the user's home directory. But wait! There is a trick you
can use. If you set the following in the [global] section of your
smb.conf file:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>logon home = \\%L\%U\.profiles</PRE
></TD
></TR
></TABLE
></P
><P
>then your Win9X clients will dutifully put their clients in a subdirectory
of your home directory called .profiles (thus making them hidden).</P
><P
>Not only that, but 'net use/home' will also work, because of a feature in
Win9X. It removes any directory stuff off the end of the home directory area
and only uses the server and share portion. That is, it looks like you
specified \\%L\%U for "logon home".</P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1533"
>8.8.2.3. Win9X and WinNT Configuration</A
></H3
><P
>You can support profiles for both Win9X and WinNT clients by setting both the
"logon home" and "logon path" parameters. For example:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>logon home = \\%L\%U\.profiles
logon path = \\%L\profiles\%U</PRE
></TD
></TR
></TABLE
></P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>I have not checked what 'net use /home' does on NT when "logon home" is
set as above.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1540"
>8.8.2.4. Windows 9X Profile Setup</A
></H3
><P
>When a user first logs in on Windows 9X, the file user.DAT is created,
as are folders "Start Menu", "Desktop", "Programs" and "Nethood".
These directories and their contents will be merged with the local
versions stored in c:\windows\profiles\username on subsequent logins,
taking the most recent from each. You will need to use the [global]
options "preserve case = yes", "short preserve case = yes" and
"case sensitive = no" in order to maintain capital letters in shortcuts
in any of the profile folders.</P
><P
>The user.DAT file contains all the user's preferences. If you wish to
enforce a set of preferences, rename their user.DAT file to user.MAN,
and deny them write access to this file.</P
><P
></P
><OL
TYPE="1"
><LI
><P
> On the Windows 95 machine, go to Control Panel | Passwords and
select the User Profiles tab. Select the required level of
roaming preferences. Press OK, but do _not_ allow the computer
to reboot.
</P
></LI
><LI
><P
> On the Windows 95 machine, go to Control Panel | Network |
Client for Microsoft Networks | Preferences. Select 'Log on to
NT Domain'. Then, ensure that the Primary Logon is 'Client for
Microsoft Networks'. Press OK, and this time allow the computer
to reboot.
</P
></LI
></OL
><P
>Under Windows 95, Profiles are downloaded from the Primary Logon.
If you have the Primary Logon as 'Client for Novell Networks', then
the profiles and logon script will be downloaded from your Novell
Server. If you have the Primary Logon as 'Windows Logon', then the
profiles will be loaded from the local machine - a bit against the
concept of roaming profiles, if you ask me.</P
><P
>You will now find that the Microsoft Networks Login box contains
[user, password, domain] instead of just [user, password]. Type in
the samba server's domain name (or any other domain known to exist,
but bear in mind that the user will be authenticated against this
domain and profiles downloaded from it, if that domain logon server
supports it), user name and user's password.</P
><P
>Once the user has been successfully validated, the Windows 95 machine
will inform you that 'The user has not logged on before' and asks you
if you wish to save the user's preferences? Select 'yes'.</P
><P
>Once the Windows 95 client comes up with the desktop, you should be able
to examine the contents of the directory specified in the "logon path"
on the samba server and verify that the "Desktop", "Start Menu",
"Programs" and "Nethood" folders have been created.</P
><P
>These folders will be cached locally on the client, and updated when
the user logs off (if you haven't made them read-only by then :-).
You will find that if the user creates further folders or short-cuts,
that the client will merge the profile contents downloaded with the
contents of the profile directory already on the local client, taking
the newest folders and short-cuts from each set.</P
><P
>If you have made the folders / files read-only on the samba server,
then you will get errors from the w95 machine on logon and logout, as
it attempts to merge the local and the remote profile. Basically, if
you have any errors reported by the w95 machine, check the Unix file
permissions and ownership rights on the profile directory contents,
on the samba server.</P
><P
>If you have problems creating user profiles, you can reset the user's
local desktop cache, as shown below. When this user then next logs in,
they will be told that they are logging in "for the first time".</P
><P
></P
><OL
TYPE="1"
><LI
><P
> instead of logging in under the [user, password, domain] dialog,
press escape.
</P
></LI
><LI
><P
> run the regedit.exe program, and look in:
</P
><P
> HKEY_LOCAL_MACHINE\Windows\CurrentVersion\ProfileList
</P
><P
> you will find an entry, for each user, of ProfilePath. Note the
contents of this key (likely to be c:\windows\profiles\username),
then delete the key ProfilePath for the required user.
</P
><P
> [Exit the registry editor].
</P
></LI
><LI
><P
> <EM
>WARNING</EM
> - before deleting the contents of the
directory listed in
the ProfilePath (this is likely to be c:\windows\profiles\username),
ask them if they have any important files stored on their desktop
or in their start menu. delete the contents of the directory
ProfilePath (making a backup if any of the files are needed).
</P
><P
> This will have the effect of removing the local (read-only hidden
system file) user.DAT in their profile directory, as well as the
local "desktop", "nethood", "start menu" and "programs" folders.
</P
></LI
><LI
><P
> search for the user's .PWL password-caching file in the c:\windows
directory, and delete it.
</P
></LI
><LI
><P
> log off the windows 95 client.
</P
></LI
><LI
><P
> check the contents of the profile path (see "logon path" described
above), and delete the user.DAT or user.MAN file for the user,
making a backup if required.
</P
></LI
></OL
><P
>If all else fails, increase samba's debug log levels to between 3 and 10,
and / or run a packet trace program such as tcpdump or netmon.exe, and
look for any error reports.</P
><P
>If you have access to an NT server, then first set up roaming profiles
and / or netlogons on the NT server. Make a packet trace, or examine
the example packet traces provided with NT server, and see what the
differences are with the equivalent samba trace.</P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1576"
>8.8.2.5. Windows NT Workstation 4.0</A
></H3
><P
>When a user first logs in to a Windows NT Workstation, the profile
NTuser.DAT is created. The profile location can be now specified
through the "logon path" parameter. </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>[lkcl 10aug97 - i tried setting the path to
\\samba-server\homes\profile, and discovered that this fails because
a background process maintains the connection to the [homes] share
which does _not_ close down in between user logins. you have to
have \\samba-server\%L\profile, where user is the username created
from the [homes] share].</P
></BLOCKQUOTE
></DIV
><P
>There is a parameter that is now available for use with NT Profiles:
"logon drive". This should be set to "h:" or any other drive, and
should be used in conjunction with the new "logon home" parameter.</P
><P
>The entry for the NT 4.0 profile is a _directory_ not a file. The NT
help on profiles mentions that a directory is also created with a .PDS
extension. The user, while logging in, must have write permission to
create the full profile path (and the folder with the .PDS extension)
[lkcl 10aug97 - i found that the creation of the .PDS directory failed,
and had to create these manually for each user, with a shell script.
also, i presume, but have not tested, that the full profile path must
be browseable just as it is for w95, due to the manner in which they
attempt to create the full profile path: test existence of each path
component; create path component].</P
><P
>In the profile directory, NT creates more folders than 95. It creates
"Application Data" and others, as well as "Desktop", "Nethood",
"Start Menu" and "Programs". The profile itself is stored in a file
NTuser.DAT. Nothing appears to be stored in the .PDS directory, and
its purpose is currently unknown.</P
><P
>You can use the System Control Panel to copy a local profile onto
a samba server (see NT Help on profiles: it is also capable of firing
up the correct location in the System Control Panel for you). The
NT Help file also mentions that renaming NTuser.DAT to NTuser.MAN
turns a profile into a mandatory one.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>[lkcl 10aug97 - i notice that NT Workstation tells me that it is
downloading a profile from a slow link. whether this is actually the
case, or whether there is some configuration issue, as yet unknown,
that makes NT Workstation _think_ that the link is a slow one is a
matter to be resolved].</P
><P
>[lkcl 20aug97 - after samba digest correspondence, one user found, and
another confirmed, that profiles cannot be loaded from a samba server
unless "security = user" and "encrypt passwords = yes" (see the file
ENCRYPTION.txt) or "security = server" and "password server = ip.address.
of.yourNTserver" are used. Either of these options will allow the NT
workstation to access the samba server using LAN manager encrypted
passwords, without the user intervention normally required by NT
workstation for clear-text passwords].</P
><P
>[lkcl 25aug97 - more comments received about NT profiles: the case of
the profile _matters_. the file _must_ be called NTuser.DAT or, for
a mandatory profile, NTuser.MAN].</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1589"
>8.8.2.6. Windows NT Server</A
></H3
><P
>There is nothing to stop you specifying any path that you like for the
location of users' profiles. Therefore, you could specify that the
profile be stored on a samba server, or any other SMB server, as long as
that SMB server supports encrypted passwords.</P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1592"
>8.8.2.7. Sharing Profiles between W95 and NT Workstation 4.0</A
></H3
><DIV
CLASS="WARNING"
><P
></P
><TABLE
CLASS="WARNING"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>Potentially outdated or incorrect material follows</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>I think this is all bogus, but have not deleted it. (Richard Sharpe)</P
></TD
></TR
></TABLE
></DIV
><P
>The default logon path is \\%N\U%. NT Workstation will attempt to create
a directory "\\samba-server\username.PDS" if you specify the logon path
as "\\samba-server\username" with the NT User Manager. Therefore, you
will need to specify (for example) "\\samba-server\username\profile".
NT 4.0 will attempt to create "\\samba-server\username\profile.PDS", which
is more likely to succeed.</P
><P
>If you then want to share the same Start Menu / Desktop with W95, you will
need to specify "logon path = \\samba-server\username\profile" [lkcl 10aug97
this has its drawbacks: i created a shortcut to telnet.exe, which attempts
to run from the c:\winnt\system32 directory. this directory is obviously
unlikely to exist on a Win95-only host].</P
><P
> If you have this set up correctly, you will find separate user.DAT and
NTuser.DAT files in the same profile directory.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>[lkcl 25aug97 - there are some issues to resolve with downloading of
NT profiles, probably to do with time/date stamps. i have found that
NTuser.DAT is never updated on the workstation after the first time that
it is copied to the local workstation profile directory. this is in
contrast to w95, where it _does_ transfer / update profiles correctly].</P
></BLOCKQUOTE
></DIV
></DIV
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1602"
>8.9. DOMAIN_CONTROL.txt : Windows NT Domain Control & Samba</A
></H1
><DIV
CLASS="WARNING"
><P
></P
><TABLE
CLASS="WARNING"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>Possibly Outdated Material</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
> This appendix was originally authored by John H Terpstra of
the Samba Team and is included here for posterity.
</P
></TD
></TR
></TABLE
></DIV
><P
><EM
>NOTE :</EM
>
The term "Domain Controller" and those related to it refer to one specific
method of authentication that can underly an SMB domain. Domain Controllers
prior to Windows NT Server 3.1 were sold by various companies and based on
private extensions to the LAN Manager 2.1 protocol. Windows NT introduced
Microsoft-specific ways of distributing the user authentication database.
See DOMAIN.txt for examples of how Samba can participate in or create
SMB domains based on shared authentication database schemes other than the
Windows NT SAM.</P
><P
>Windows NT Server can be installed as either a plain file and print server
(WORKGROUP workstation or server) or as a server that participates in Domain
Control (DOMAIN member, Primary Domain controller or Backup Domain controller).
The same is true for OS/2 Warp Server, Digital Pathworks and other similar
products, all of which can participate in Domain Control along with Windows NT.</P
><P
>To many people these terms can be confusing, so let's try to clear the air.</P
><P
>Every Windows NT system (workstation or server) has a registry database.
The registry contains entries that describe the initialization information
for all services (the equivalent of Unix Daemons) that run within the Windows
NT environment. The registry also contains entries that tell application
software where to find dynamically loadable libraries that they depend upon.
In fact, the registry contains entries that describes everything that anything
may need to know to interact with the rest of the system.</P
><P
>The registry files can be located on any Windows NT machine by opening a
command prompt and typing:</P
><P
><TT
CLASS="PROMPT"
>C:\WINNT\></TT
> dir %SystemRoot%\System32\config</P
><P
>The environment variable %SystemRoot% value can be obtained by typing:</P
><P
><TT
CLASS="PROMPT"
>C:\WINNT></TT
>echo %SystemRoot%</P
><P
>The active parts of the registry that you may want to be familiar with are
the files called: default, system, software, sam and security.</P
><P
>In a domain environment, Microsoft Windows NT domain controllers participate
in replication of the SAM and SECURITY files so that all controllers within
the domain have an exactly identical copy of each.</P
><P
>The Microsoft Windows NT system is structured within a security model that
says that all applications and services must authenticate themselves before
they can obtain permission from the security manager to do what they set out
to do.</P
><P
>The Windows NT User database also resides within the registry. This part of
the registry contains the user's security identifier, home directory, group
memberships, desktop profile, and so on.</P
><P
>Every Windows NT system (workstation as well as server) will have its own
registry. Windows NT Servers that participate in Domain Security control
have a database that they share in common - thus they do NOT own an
independent full registry database of their own, as do Workstations and
plain Servers.</P
><P
>The User database is called the SAM (Security Access Manager) database and
is used for all user authentication as well as for authentication of inter-
process authentication (i.e. to ensure that the service action a user has
requested is permitted within the limits of that user's privileges).</P
><P
>The Samba team have produced a utility that can dump the Windows NT SAM into
smbpasswd format: see ENCRYPTION.txt for information on smbpasswd and
/pub/samba/pwdump on your nearest Samba mirror for the utility. This
facility is useful but cannot be easily used to implement SAM replication
to Samba systems.</P
><P
>Windows for Workgroups, Windows 95, and Windows NT Workstations and Servers
can participate in a Domain security system that is controlled by Windows NT
servers that have been correctly configured. Almost every domain will have
ONE Primary Domain Controller (PDC). It is desirable that each domain will
have at least one Backup Domain Controller (BDC).</P
><P
>The PDC and BDCs then participate in replication of the SAM database so that
each Domain Controlling participant will have an up to date SAM component
within its registry.</P
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="WINBIND"
>Chapter 9. Unified Logons between Windows NT and UNIX using Winbind</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN1652"
>9.1. Abstract</A
></H1
><P
>Integration of UNIX and Microsoft Windows NT through
a unified logon has been considered a "holy grail" in heterogeneous
computing environments for a long time. We present
<EM
>winbind</EM
>, a component of the Samba suite
of programs as a solution to the unified logon problem. Winbind
uses a UNIX implementation
of Microsoft RPC calls, Pluggable Authentication Modules, and the Name
Service Switch to allow Windows NT domain users to appear and operate
as UNIX users on a UNIX machine. This paper describes the winbind
system, explaining the functionality it provides, how it is configured,
and how it works internally.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1656"
>9.2. Introduction</A
></H1
><P
>It is well known that UNIX and Microsoft Windows NT have
different models for representing user and group information and
use different technologies for implementing them. This fact has
made it difficult to integrate the two systems in a satisfactory
manner.</P
><P
>One common solution in use today has been to create
identically named user accounts on both the UNIX and Windows systems
and use the Samba suite of programs to provide file and print services
between the two. This solution is far from perfect however, as
adding and deleting users on both sets of machines becomes a chore
and two sets of passwords are required both of which
can lead to synchronization problems between the UNIX and Windows
systems and confusion for users.</P
><P
>We divide the unified logon problem for UNIX machines into
three smaller problems:</P
><P
></P
><UL
><LI
><P
>Obtaining Windows NT user and group information
</P
></LI
><LI
><P
>Authenticating Windows NT users
</P
></LI
><LI
><P
>Password changing for Windows NT users
</P
></LI
></UL
><P
>Ideally, a prospective solution to the unified logon problem
would satisfy all the above components without duplication of
information on the UNIX machines and without creating additional
tasks for the system administrator when maintaining users and
groups on either system. The winbind system provides a simple
and elegant solution to all three components of the unified logon
problem.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1669"
>9.3. What Winbind Provides</A
></H1
><P
>Winbind unifies UNIX and Windows NT account management by
allowing a UNIX box to become a full member of a NT domain. Once
this is done the UNIX box will see NT users and groups as if
they were native UNIX users and groups, allowing the NT domain
to be used in much the same manner that NIS+ is used within
UNIX-only environments.</P
><P
>The end result is that whenever any
program on the UNIX machine asks the operating system to lookup
a user or group name, the query will be resolved by asking the
NT domain controller for the specified domain to do the lookup.
Because Winbind hooks into the operating system at a low level
(via the NSS name resolution modules in the C library) this
redirection to the NT domain controller is completely
transparent.</P
><P
>Users on the UNIX machine can then use NT user and group
names as they would use "native" UNIX names. They can chown files
so that they are owned by NT domain users or even login to the
UNIX machine and run a UNIX X-Window session as a domain user.</P
><P
>The only obvious indication that Winbind is being used is
that user and group names take the form DOMAIN\user and
DOMAIN\group. This is necessary as it allows Winbind to determine
that redirection to a domain controller is wanted for a particular
lookup and which trusted domain is being referenced.</P
><P
>Additionally, Winbind provides an authentication service
that hooks into the Pluggable Authentication Modules (PAM) system
to provide authentication via a NT domain to any PAM enabled
applications. This capability solves the problem of synchronizing
passwords between systems since all passwords are stored in a single
location (on the domain controller).</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1676"
>9.3.1. Target Uses</A
></H2
><P
>Winbind is targeted at organizations that have an
existing NT based domain infrastructure into which they wish
to put UNIX workstations or servers. Winbind will allow these
organizations to deploy UNIX workstations without having to
maintain a separate account infrastructure. This greatly
simplifies the administrative overhead of deploying UNIX
workstations into a NT based organization.</P
><P
>Another interesting way in which we expect Winbind to
be used is as a central part of UNIX based appliances. Appliances
that provide file and print services to Microsoft based networks
will be able to use Winbind to provide seamless integration of
the appliance into the domain.</P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1680"
>9.4. How Winbind Works</A
></H1
><P
>The winbind system is designed around a client/server
architecture. A long running <B
CLASS="COMMAND"
>winbindd</B
> daemon
listens on a UNIX domain socket waiting for requests
to arrive. These requests are generated by the NSS and PAM
clients and processed sequentially.</P
><P
>The technologies used to implement winbind are described
in detail below.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1685"
>9.4.1. Microsoft Remote Procedure Calls</A
></H2
><P
>Over the last two years, efforts have been underway
by various Samba Team members to decode various aspects of
the Microsoft Remote Procedure Call (MSRPC) system. This
system is used for most network related operations between
Windows NT machines including remote management, user authentication
and print spooling. Although initially this work was done
to aid the implementation of Primary Domain Controller (PDC)
functionality in Samba, it has also yielded a body of code which
can be used for other purposes.</P
><P
>Winbind uses various MSRPC calls to enumerate domain users
and groups and to obtain detailed information about individual
users or groups. Other MSRPC calls can be used to authenticate
NT domain users and to change user passwords. By directly querying
a Windows PDC for user and group information, winbind maps the
NT account information onto UNIX user and group names.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1689"
>9.4.2. Name Service Switch</A
></H2
><P
>The Name Service Switch, or NSS, is a feature that is
present in many UNIX operating systems. It allows system
information such as hostnames, mail aliases and user information
to be resolved from different sources. For example, a standalone
UNIX workstation may resolve system information from a series of
flat files stored on the local filesystem. A networked workstation
may first attempt to resolve system information from local files,
and then consult a NIS database for user information or a DNS server
for hostname information.</P
><P
>The NSS application programming interface allows winbind
to present itself as a source of system information when
resolving UNIX usernames and groups. Winbind uses this interface,
and information obtained from a Windows NT server using MSRPC
calls to provide a new source of account enumeration. Using standard
UNIX library calls, one can enumerate the users and groups on
a UNIX machine running winbind and see all users and groups in
a NT domain plus any trusted domain as though they were local
users and groups.</P
><P
>The primary control file for NSS is
<TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
>.
When a UNIX application makes a request to do a lookup
the C library looks in <TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
>
for a line which matches the service type being requested, for
example the "passwd" service type is used when user or group names
are looked up. This config line species which implementations
of that service should be tried and in what order. If the passwd
config line is:</P
><P
><B
CLASS="COMMAND"
>passwd: files example</B
></P
><P
>then the C library will first load a module called
<TT
CLASS="FILENAME"
>/lib/libnss_files.so</TT
> followed by
the module <TT
CLASS="FILENAME"
>/lib/libnss_example.so</TT
>. The
C library will dynamically load each of these modules in turn
and call resolver functions within the modules to try to resolve
the request. Once the request is resolved the C library returns the
result to the application.</P
><P
>This NSS interface provides a very easy way for Winbind
to hook into the operating system. All that needs to be done
is to put <TT
CLASS="FILENAME"
>libnss_winbind.so</TT
> in <TT
CLASS="FILENAME"
>/lib/</TT
>
then add "winbind" into <TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
> at
the appropriate place. The C library will then call Winbind to
resolve user and group names.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1705"
>9.4.3. Pluggable Authentication Modules</A
></H2
><P
>Pluggable Authentication Modules, also known as PAM,
is a system for abstracting authentication and authorization
technologies. With a PAM module it is possible to specify different
authentication methods for different system applications without
having to recompile these applications. PAM is also useful
for implementing a particular policy for authorization. For example,
a system administrator may only allow console logins from users
stored in the local password file but only allow users resolved from
a NIS database to log in over the network.</P
><P
>Winbind uses the authentication management and password
management PAM interface to integrate Windows NT users into a
UNIX system. This allows Windows NT users to log in to a UNIX
machine and be authenticated against a suitable Primary Domain
Controller. These users can also change their passwords and have
this change take effect directly on the Primary Domain Controller.
</P
><P
>PAM is configured by providing control files in the directory
<TT
CLASS="FILENAME"
>/etc/pam.d/</TT
> for each of the services that
require authentication. When an authentication request is made
by an application the PAM code in the C library looks up this
control file to determine what modules to load to do the
authentication check and in what order. This interface makes adding
a new authentication service for Winbind very easy, all that needs
to be done is that the <TT
CLASS="FILENAME"
>pam_winbind.so</TT
> module
is copied to <TT
CLASS="FILENAME"
>/lib/security/</TT
> and the PAM
control files for relevant services are updated to allow
authentication via winbind. See the PAM documentation
for more details.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1713"
>9.4.4. User and Group ID Allocation</A
></H2
><P
>When a user or group is created under Windows NT
is it allocated a numerical relative identifier (RID). This is
slightly different to UNIX which has a range of numbers that are
used to identify users, and the same range in which to identify
groups. It is winbind's job to convert RIDs to UNIX id numbers and
vice versa. When winbind is configured it is given part of the UNIX
user id space and a part of the UNIX group id space in which to
store Windows NT users and groups. If a Windows NT user is
resolved for the first time, it is allocated the next UNIX id from
the range. The same process applies for Windows NT groups. Over
time, winbind will have mapped all Windows NT users and groups
to UNIX user ids and group ids.</P
><P
>The results of this mapping are stored persistently in
an ID mapping database held in a tdb database). This ensures that
RIDs are mapped to UNIX IDs in a consistent way.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1717"
>9.4.5. Result Caching</A
></H2
><P
>An active system can generate a lot of user and group
name lookups. To reduce the network cost of these lookups winbind
uses a caching scheme based on the SAM sequence number supplied
by NT domain controllers. User or group information returned
by a PDC is cached by winbind along with a sequence number also
returned by the PDC. This sequence number is incremented by
Windows NT whenever any user or group information is modified. If
a cached entry has expired, the sequence number is requested from
the PDC and compared against the sequence number of the cached entry.
If the sequence numbers do not match, then the cached information
is discarded and up to date information is requested directly
from the PDC.</P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1720"
>9.5. Installation and Configuration</A
></H1
><P
>Many thanks to John Trostel <A
HREF="mailto:jtrostel@snapserver.com"
TARGET="_top"
>jtrostel@snapserver.com</A
>
for providing the HOWTO for this section.</P
><P
>This HOWTO describes how to get winbind services up and running
to control access and authenticate users on your Linux box using
the winbind services which come with SAMBA 2.2.2.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1725"
>9.5.1. Introduction</A
></H2
><P
>This HOWTO describes the procedures used to get winbind up and
running on my RedHat 7.1 system. Winbind is capable of providing access
and authentication control for Windows Domain users through an NT
or Win2K PDC for 'regular' services, such as telnet a nd ftp, as
well for SAMBA services.</P
><P
>This HOWTO has been written from a 'RedHat-centric' perspective, so if
you are using another distribution, you may have to modify the instructions
somewhat to fit the way your distribution works.</P
><P
></P
><UL
><LI
><P
> <EM
>Why should I to this?</EM
>
</P
><P
>This allows the SAMBA administrator to rely on the
authentication mechanisms on the NT/Win2K PDC for the authentication
of domain members. NT/Win2K users no longer need to have separate
accounts on the SAMBA server.
</P
></LI
><LI
><P
> <EM
>Who should be reading this document?</EM
>
</P
><P
> This HOWTO is designed for system administrators. If you are
implementing SAMBA on a file server and wish to (fairly easily)
integrate existing NT/Win2K users from your PDC onto the
SAMBA server, this HOWTO is for you. That said, I am no NT or PAM
expert, so you may find a better or easier way to accomplish
these tasks.
</P
></LI
></UL
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1738"
>9.5.2. Requirements</A
></H2
><P
>If you have a samba configuration file that you are currently
using... <EM
>BACK IT UP!</EM
> If your system already uses PAM,
<EM
>back up the <TT
CLASS="FILENAME"
>/etc/pam.d</TT
> directory
contents!</EM
> If you haven't already made a boot disk,
<EM
>MAKE ONE NOW!</EM
></P
><P
>Messing with the pam configuration files can make it nearly impossible
to log in to yourmachine. That's why you want to be able to boot back
into your machine in single user mode and restore your
<TT
CLASS="FILENAME"
>/etc/pam.d</TT
> back to the original state they were in if
you get frustrated with the way things are going. ;-)</P
><P
>The latest version of SAMBA (version 2.2.2 as of this writing), now
includes a functioning winbindd daemon. Please refer to the
<A
HREF="http://samba.org/"
TARGET="_top"
>main SAMBA web page</A
> or,
better yet, your closest SAMBA mirror site for instructions on
downloading the source code.</P
><P
>To allow Domain users the ability to access SAMBA shares and
files, as well as potentially other services provided by your
SAMBA machine, PAM (pluggable authentication modules) must
be setup properly on your machine. In order to compile the
winbind modules, you should have at least the pam libraries resident
on your system. For recent RedHat systems (7.1, for instance), that
means <TT
CLASS="FILENAME"
>pam-0.74-22</TT
>. For best results, it is helpful to also
install the development packages in <TT
CLASS="FILENAME"
>pam-devel-0.74-22</TT
>.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1752"
>9.5.3. Testing Things Out</A
></H2
><P
>Before starting, it is probably best to kill off all the SAMBA
related daemons running on your server. Kill off all <B
CLASS="COMMAND"
>smbd</B
>,
<B
CLASS="COMMAND"
>nmbd</B
>, and <B
CLASS="COMMAND"
>winbindd</B
> processes that may
be running. To use PAM, you will want to make sure that you have the
standard PAM package (for RedHat) which supplies the <TT
CLASS="FILENAME"
>/etc/pam.d</TT
>
directory structure, including the pam modules are used by pam-aware
services, several pam libraries, and the <TT
CLASS="FILENAME"
>/usr/doc</TT
>
and <TT
CLASS="FILENAME"
>/usr/man</TT
> entries for pam. Winbind built better
in SAMBA if the pam-devel package was also installed. This package includes
the header files needed to compile pam-aware applications. For instance,
my RedHat system has both <TT
CLASS="FILENAME"
>pam-0.74-22</TT
> and
<TT
CLASS="FILENAME"
>pam-devel-0.74-22</TT
> RPMs installed.</P
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1763"
>9.5.3.1. Configure and compile SAMBA</A
></H3
><P
>The configuration and compilation of SAMBA is pretty straightforward.
The first three steps may not be necessary depending upon
whether or not you have previously built the Samba binaries.</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>autoconf</B
>
<TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>make clean</B
>
<TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>rm config.cache</B
>
<TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>./configure --with-winbind</B
>
<TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>make</B
>
<TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>make install</B
></PRE
></TD
></TR
></TABLE
></P
><P
>This will, by default, install SAMBA in <TT
CLASS="FILENAME"
>/usr/local/samba</TT
>.
See the main SAMBA documentation if you want to install SAMBA somewhere else.
It will also build the winbindd executable and libraries. </P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1782"
>9.5.3.2. Configure <TT
CLASS="FILENAME"
>nsswitch.conf</TT
> and the
winbind libraries</A
></H3
><P
>The libraries needed to run the <B
CLASS="COMMAND"
>winbindd</B
> daemon
through nsswitch need to be copied to their proper locations, so</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>cp ../samba/source/nsswitch/libnss_winbind.so /lib</B
></P
><P
>I also found it necessary to make the following symbolic link:</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>ln -s /lib/libnss_winbind.so /lib/libnss_winbind.so.2</B
></P
><P
>Now, as root you need to edit <TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
> to
allow user and group entries to be visible from the <B
CLASS="COMMAND"
>winbindd</B
>
daemon. My <TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
> file look like
this after editing:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> passwd: files winbind
shadow: files
group: files winbind</PRE
></TD
></TR
></TABLE
></P
><P
>
The libraries needed by the winbind daemon will be automatically
entered into the <B
CLASS="COMMAND"
>ldconfig</B
> cache the next time
your system reboots, but it
is faster (and you don't need to reboot) if you do it manually:</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>/sbin/ldconfig -v | grep winbind</B
></P
><P
>This makes <TT
CLASS="FILENAME"
>libnss_winbind</TT
> available to winbindd
and echos back a check to you.</P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1807"
>9.5.3.3. Configure smb.conf</A
></H3
><P
>Several parameters are needed in the smb.conf file to control
the behavior of <B
CLASS="COMMAND"
>winbindd</B
>. Configure
<TT
CLASS="FILENAME"
>smb.conf</TT
> These are described in more detail in
the <A
HREF="winbindd.8.html"
TARGET="_top"
>winbindd(8)</A
> man page. My
<TT
CLASS="FILENAME"
>smb.conf</TT
> file was modified to
include the following entries in the [global] section:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>[global]
<...>
# separate domain and username with '+', like DOMAIN+username
<A
HREF="winbindd.8.html#WINBINDSEPARATOR"
TARGET="_top"
>winbind separator</A
> = +
# use uids from 10000 to 20000 for domain users
<A
HREF="winbindd.8.html#WINBINDUID"
TARGET="_top"
>winbind uid</A
> = 10000-20000
# use gids from 10000 to 20000 for domain groups
<A
HREF="winbindd.8.html#WINBINDGID"
TARGET="_top"
>winbind gid</A
> = 10000-20000
# allow enumeration of winbind users and groups
<A
HREF="winbindd.8.html#WINBINDENUMUSERS"
TARGET="_top"
>winbind enum users</A
> = yes
<A
HREF="winbindd.8.html#WINBINDENUMGROUP"
TARGET="_top"
>winbind enum groups</A
> = yes
# give winbind users a real shell (only needed if they have telnet access)
<A
HREF="winbindd.8.html#TEMPLATEHOMEDIR"
TARGET="_top"
>template homedir</A
> = /home/winnt/%D/%U
<A
HREF="winbindd.8.html#TEMPLATESHELL"
TARGET="_top"
>template shell</A
> = /bin/bash</PRE
></TD
></TR
></TABLE
></P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1823"
>9.5.3.4. Join the SAMBA server to the PDC domain</A
></H3
><P
>Enter the following command to make the SAMBA server join the
PDC domain, where <TT
CLASS="REPLACEABLE"
><I
>DOMAIN</I
></TT
> is the name of
your Windows domain and <TT
CLASS="REPLACEABLE"
><I
>Administrator</I
></TT
> is
a domain user who has administrative privileges in the domain.</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>/usr/local/samba/bin/smbpasswd -j DOMAIN -r PDC -U Administrator</B
></P
><P
>The proper response to the command should be: "Joined the domain
<TT
CLASS="REPLACEABLE"
><I
>DOMAIN</I
></TT
>" where <TT
CLASS="REPLACEABLE"
><I
>DOMAIN</I
></TT
>
is your DOMAIN name.</P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1834"
>9.5.3.5. Start up the winbindd daemon and test it!</A
></H3
><P
>Eventually, you will want to modify your smb startup script to
automatically invoke the winbindd daemon when the other parts of
SAMBA start, but it is possible to test out just the winbind
portion first. To start up winbind services, enter the following
command as root:</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>/usr/local/samba/bin/winbindd</B
></P
><P
>I'm always paranoid and like to make sure the daemon
is really running...</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>ps -ae | grep winbindd</B
></P
><P
>This command should produce output like this, if the daemon is running</P
><P
>3025 ? 00:00:00 winbindd</P
><P
>Now... for the real test, try to get some information about the
users on your PDC</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>/usr/local/samba/bin/wbinfo -u</B
></P
><P
>
This should echo back a list of users on your Windows users on
your PDC. For example, I get the following response:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>CEO+Administrator
CEO+burdell
CEO+Guest
CEO+jt-ad
CEO+krbtgt
CEO+TsInternetUser</PRE
></TD
></TR
></TABLE
></P
><P
>Obviously, I have named my domain 'CEO' and my <TT
CLASS="PARAMETER"
><I
>winbind
separator</I
></TT
> is '+'.</P
><P
>You can do the same sort of thing to get group information from
the PDC:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>/usr/local/samba/bin/wbinfo -g</B
>
CEO+Domain Admins
CEO+Domain Users
CEO+Domain Guests
CEO+Domain Computers
CEO+Domain Controllers
CEO+Cert Publishers
CEO+Schema Admins
CEO+Enterprise Admins
CEO+Group Policy Creator Owners</PRE
></TD
></TR
></TABLE
></P
><P
>The function 'getent' can now be used to get unified
lists of both local and PDC users and groups.
Try the following command:</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>getent passwd</B
></P
><P
>You should get a list that looks like your <TT
CLASS="FILENAME"
>/etc/passwd</TT
>
list followed by the domain users with their new uids, gids, home
directories and default shells.</P
><P
>The same thing can be done for groups with the command</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>getent group</B
></P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1870"
>9.5.3.6. Fix the <TT
CLASS="FILENAME"
>/etc/rc.d/init.d/smb</TT
> startup files</A
></H3
><P
>The <B
CLASS="COMMAND"
>winbindd</B
> daemon needs to start up after the
<B
CLASS="COMMAND"
>smbd</B
> and <B
CLASS="COMMAND"
>nmbd</B
> daemons are running.
To accomplish this task, you need to modify the <TT
CLASS="FILENAME"
>/etc/init.d/smb</TT
>
script to add commands to invoke this daemon in the proper sequence. My
<TT
CLASS="FILENAME"
>/etc/init.d/smb</TT
> file starts up <B
CLASS="COMMAND"
>smbd</B
>,
<B
CLASS="COMMAND"
>nmbd</B
>, and <B
CLASS="COMMAND"
>winbindd</B
> from the
<TT
CLASS="FILENAME"
>/usr/local/samba/bin</TT
> directory directly. The 'start'
function in the script looks like this:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>start() {
KIND="SMB"
echo -n $"Starting $KIND services: "
daemon /usr/local/samba/bin/smbd $SMBDOPTIONS
RETVAL=$?
echo
KIND="NMB"
echo -n $"Starting $KIND services: "
daemon /usr/local/samba/bin/nmbd $NMBDOPTIONS
RETVAL2=$?
echo
KIND="Winbind"
echo -n $"Starting $KIND services: "
daemon /usr/local/samba/bin/winbindd
RETVAL3=$?
echo
[ $RETVAL -eq 0 -a $RETVAL2 -eq 0 -a $RETVAL3 -eq 0 ] && touch /var/lock/subsys/smb || \
RETVAL=1
return $RETVAL
}</PRE
></TD
></TR
></TABLE
></P
><P
>The 'stop' function has a corresponding entry to shut down the
services and look s like this:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>stop() {
KIND="SMB"
echo -n $"Shutting down $KIND services: "
killproc smbd
RETVAL=$?
echo
KIND="NMB"
echo -n $"Shutting down $KIND services: "
killproc nmbd
RETVAL2=$?
echo
KIND="Winbind"
echo -n $"Shutting down $KIND services: "
killproc winbindd
RETVAL3=$?
[ $RETVAL -eq 0 -a $RETVAL2 -eq 0 -a $RETVAL3 -eq 0 ] && rm -f /var/lock/subsys/smb
echo ""
return $RETVAL
}</PRE
></TD
></TR
></TABLE
></P
><P
>If you restart the <B
CLASS="COMMAND"
>smbd</B
>, <B
CLASS="COMMAND"
>nmbd</B
>,
and <B
CLASS="COMMAND"
>winbindd</B
> daemons at this point, you
should be able to connect to the samba server as a domain member just as
if you were a local user.</P
></DIV
><DIV
CLASS="SECT3"
><HR><H3
CLASS="SECT3"
><A
NAME="AEN1892"
>9.5.3.7. Configure Winbind and PAM</A
></H3
><P
>If you have made it this far, you know that winbindd and samba are working
together. If you want to use winbind to provide authentication for other
services, keep reading. The pam configuration files need to be altered in
this step. (Did you remember to make backups of your original
<TT
CLASS="FILENAME"
>/etc/pam.d</TT
> files? If not, do it now.)</P
><P
>You will need a pam module to use winbindd with these other services. This
module will be compiled in the <TT
CLASS="FILENAME"
>../source/nsswitch</TT
> directory
by invoking the command</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>make nsswitch/pam_winbind.so</B
></P
><P
>from the <TT
CLASS="FILENAME"
>../source</TT
> directory. The
<TT
CLASS="FILENAME"
>pam_winbind.so</TT
> file should be copied to the location of
your other pam security modules. On my RedHat system, this was the
<TT
CLASS="FILENAME"
>/lib/security</TT
> directory.</P
><P
><TT
CLASS="PROMPT"
>root#</TT
> <B
CLASS="COMMAND"
>cp ../samba/source/nsswitch/pam_winbind.so /lib/security</B
></P
><P
>The <TT
CLASS="FILENAME"
>/etc/pam.d/samba</TT
> file does not need to be changed. I
just left this fileas it was:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>auth required /lib/security/pam_stack.so service=system-auth
account required /lib/security/pam_stack.so service=system-auth</PRE
></TD
></TR
></TABLE
></P
><P
>The other services that I modified to allow the use of winbind
as an authentication service were the normal login on the console (or a terminal
session), telnet logins, and ftp service. In order to enable these
services, you may first need to change the entries in
<TT
CLASS="FILENAME"
>/etc/xinetd.d</TT
> (or <TT
CLASS="FILENAME"
>/etc/inetd.conf</TT
>).
RedHat 7.1 uses the new xinetd.d structure, in this case you need
to change the lines in <TT
CLASS="FILENAME"
>/etc/xinetd.d/telnet</TT
>
and <TT
CLASS="FILENAME"
>/etc/xinetd.d/wu-ftp</TT
> from </P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>enable = no</PRE
></TD
></TR
></TABLE
></P
><P
>to</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>enable = yes</PRE
></TD
></TR
></TABLE
></P
><P
>
For ftp services to work properly, you will also need to either
have individual directories for the domain users already present on
the server, or change the home directory template to a general
directory for all domain users. These can be easily set using
the <TT
CLASS="FILENAME"
>smb.conf</TT
> global entry
<B
CLASS="COMMAND"
>template homedir</B
>.</P
><P
>The <TT
CLASS="FILENAME"
>/etc/pam.d/ftp</TT
> file can be changed
to allow winbind ftp access in a manner similar to the
samba file. My <TT
CLASS="FILENAME"
>/etc/pam.d/ftp</TT
> file was
changed to look like this:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>auth required /lib/security/pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed
auth sufficient /lib/security/pam_winbind.so
auth required /lib/security/pam_stack.so service=system-auth
auth required /lib/security/pam_shells.so
account sufficient /lib/security/pam_winbind.so
account required /lib/security/pam_stack.so service=system-auth
session required /lib/security/pam_stack.so service=system-auth</PRE
></TD
></TR
></TABLE
></P
><P
>The <TT
CLASS="FILENAME"
>/etc/pam.d/login</TT
> file can be changed nearly the
same way. It now looks like this:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>auth required /lib/security/pam_securetty.so
auth sufficient /lib/security/pam_winbind.so
auth sufficient /lib/security/pam_unix.so use_first_pass
auth required /lib/security/pam_stack.so service=system-auth
auth required /lib/security/pam_nologin.so
account sufficient /lib/security/pam_winbind.so
account required /lib/security/pam_stack.so service=system-auth
password required /lib/security/pam_stack.so service=system-auth
session required /lib/security/pam_stack.so service=system-auth
session optional /lib/security/pam_console.so</PRE
></TD
></TR
></TABLE
></P
><P
>In this case, I added the <B
CLASS="COMMAND"
>auth sufficient /lib/security/pam_winbind.so</B
>
lines as before, but also added the <B
CLASS="COMMAND"
>required pam_securetty.so</B
>
above it, to disallow root logins over the network. I also added a
<B
CLASS="COMMAND"
>sufficient /lib/security/pam_unix.so use_first_pass</B
>
line after the <B
CLASS="COMMAND"
>winbind.so</B
> line to get rid of annoying
double prompts for passwords.</P
></DIV
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1939"
>9.6. Limitations</A
></H1
><P
>Winbind has a number of limitations in its current
released version that we hope to overcome in future
releases:</P
><P
></P
><UL
><LI
><P
>Winbind is currently only available for
the Linux operating system, although ports to other operating
systems are certainly possible. For such ports to be feasible,
we require the C library of the target operating system to
support the Name Service Switch and Pluggable Authentication
Modules systems. This is becoming more common as NSS and
PAM gain support among UNIX vendors.</P
></LI
><LI
><P
>The mappings of Windows NT RIDs to UNIX ids
is not made algorithmically and depends on the order in which
unmapped users or groups are seen by winbind. It may be difficult
to recover the mappings of rid to UNIX id mapping if the file
containing this information is corrupted or destroyed.</P
></LI
><LI
><P
>Currently the winbind PAM module does not take
into account possible workstation and logon time restrictions
that may be been set for Windows NT users.</P
></LI
></UL
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN1949"
>9.7. Conclusion</A
></H1
><P
>The winbind system, through the use of the Name Service
Switch, Pluggable Authentication Modules, and appropriate
Microsoft RPC calls have allowed us to provide seamless
integration of Microsoft Windows NT domain users on a
UNIX system. The result is a great reduction in the administrative
cost of running a mixed UNIX and NT network.</P
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="OS2"
>Chapter 10. OS2 Client HOWTO</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN1963"
>10.1. FAQs</A
></H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN1965"
>10.1.1. How can I configure OS/2 Warp Connect or
OS/2 Warp 4 as a client for Samba?</A
></H2
><P
>A more complete answer to this question can be
found on <A
HREF="http://carol.wins.uva.nl/~leeuw/samba/warp.html"
TARGET="_top"
> http://carol.wins.uva.nl/~leeuw/samba/warp.html</A
>.</P
><P
>Basically, you need three components:</P
><P
></P
><UL
><LI
><P
>The File and Print Client ('IBM Peer')
</P
></LI
><LI
><P
>TCP/IP ('Internet support')
</P
></LI
><LI
><P
>The "NetBIOS over TCP/IP" driver ('TCPBEUI')
</P
></LI
></UL
><P
>Installing the first two together with the base operating
system on a blank system is explained in the Warp manual. If Warp
has already been installed, but you now want to install the
networking support, use the "Selective Install for Networking"
object in the "System Setup" folder.</P
><P
>Adding the "NetBIOS over TCP/IP" driver is not described
in the manual and just barely in the online documentation. Start
MPTS.EXE, click on OK, click on "Configure LAPS" and click
on "IBM OS/2 NETBIOS OVER TCP/IP" in 'Protocols'. This line
is then moved to 'Current Configuration'. Select that line,
click on "Change number" and increase it from 0 to 1. Save this
configuration.</P
><P
>If the Samba server(s) is not on your local subnet, you
can optionally add IP names and addresses of these servers
to the "Names List", or specify a WINS server ('NetBIOS
Nameserver' in IBM and RFC terminology). For Warp Connect you
may need to download an update for 'IBM Peer' to bring it on
the same level as Warp 4. See the webpage mentioned above.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1980"
>10.1.2. How can I configure OS/2 Warp 3 (not Connect),
OS/2 1.2, 1.3 or 2.x for Samba?</A
></H2
><P
>You can use the free Microsoft LAN Manager 2.2c Client
for OS/2 from
<A
HREF="ftp://ftp.microsoft.com/BusSys/Clients/LANMAN.OS2/"
TARGET="_top"
> ftp://ftp.microsoft.com/BusSys/Clients/LANMAN.OS2/</A
>.
See <A
HREF="http://carol.wins.uva.nl/~leeuw/lanman.html"
TARGET="_top"
> http://carol.wins.uva.nl/~leeuw/lanman.html</A
> for
more information on how to install and use this client. In
a nutshell, edit the file \OS2VER in the root directory of
the OS/2 boot partition and add the lines:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> 20=setup.exe
20=netwksta.sys
20=netvdd.sys
</PRE
></TD
></TR
></TABLE
></P
><P
>before you install the client. Also, don't use the
included NE2000 driver because it is buggy. Try the NE2000
or NS2000 driver from
<A
HREF="ftp://ftp.cdrom.com/pub/os2/network/ndis/"
TARGET="_top"
> ftp://ftp.cdrom.com/pub/os2/network/ndis/</A
> instead.
</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1989"
>10.1.3. Are there any other issues when OS/2 (any version)
is used as a client?</A
></H2
><P
>When you do a NET VIEW or use the "File and Print
Client Resource Browser", no Samba servers show up. This can
be fixed by a patch from <A
HREF="http://carol.wins.uva.nl/~leeuw/samba/fix.html"
TARGET="_top"
> http://carol.wins.uva.nl/~leeuw/samba/fix.html</A
>.
The patch will be included in a later version of Samba. It also
fixes a couple of other problems, such as preserving long
filenames when objects are dragged from the Workplace Shell
to the Samba server. </P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN1993"
>10.1.4. How do I get printer driver download working
for OS/2 clients?</A
></H2
><P
>First, create a share called [PRINTDRV] that is
world-readable. Copy your OS/2 driver files there. Note
that the .EA_ files must still be separate, so you will need
to use the original install files, and not copy an installed
driver from an OS/2 system.</P
><P
>Install the NT driver first for that printer. Then,
add to your smb.conf a parameter, "os2 driver map =
<TT
CLASS="REPLACEABLE"
><I
>filename</I
></TT
>". Then, in the file
specified by <TT
CLASS="REPLACEABLE"
><I
>filename</I
></TT
>, map the
name of the NT driver name to the OS/2 driver name as
follows:</P
><P
><nt driver name> = <os2 driver
name>.<device name>, e.g.:
HP LaserJet 5L = LASERJET.HP LaserJet 5L</P
><P
>You can have multiple drivers mapped in this file.</P
><P
>If you only specify the OS/2 driver name, and not the
device name, the first attempt to download the driver will
actually download the files, but the OS/2 client will tell
you the driver is not available. On the second attempt, it
will work. This is fixed simply by adding the device name
to the mapping, after which it will work on the first attempt.
</P
></DIV
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="CVS-ACCESS"
>Chapter 11. HOWTO Access Samba source code via CVS</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN2009"
>11.1. Introduction</A
></H1
><P
>Samba is developed in an open environment. Developers use CVS
(Concurrent Versioning System) to "checkin" (also known as
"commit") new source code. Samba's various CVS branches can
be accessed via anonymous CVS using the instructions
detailed in this chapter.</P
><P
>This document is a modified version of the instructions found at
<A
HREF="http://samba.org/samba/cvs.html"
TARGET="_top"
>http://samba.org/samba/cvs.html</A
></P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN2014"
>11.2. CVS Access to samba.org</A
></H1
><P
>The machine samba.org runs a publicly accessible CVS
repository for access to the source code of several packages,
including samba, rsync and jitterbug. There are two main ways of
accessing the CVS server on this host.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN2017"
>11.2.1. Access via CVSweb</A
></H2
><P
>You can access the source code via your
favourite WWW browser. This allows you to access the contents of
individual files in the repository and also to look at the revision
history and commit logs of individual files. You can also ask for a diff
listing between any two versions on the repository.</P
><P
>Use the URL : <A
HREF="http://samba.org/cgi-bin/cvsweb"
TARGET="_top"
>http://samba.org/cgi-bin/cvsweb</A
></P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN2022"
>11.2.2. Access via cvs</A
></H2
><P
>You can also access the source code via a
normal cvs client. This gives you much more control over you can
do with the repository and allows you to checkout whole source trees
and keep them up to date via normal cvs commands. This is the
preferred method of access if you are a developer and not
just a casual browser.</P
><P
>To download the latest cvs source code, point your
browser at the URL : <A
HREF="http://www.cyclic.com/"
TARGET="_top"
>http://www.cyclic.com/</A
>.
and click on the 'How to get cvs' link. CVS is free software under
the GNU GPL (as is Samba). Note that there are several graphical CVS clients
which provide a graphical interface to the sometimes mundane CVS commands.
Links to theses clients are also available from http://www.cyclic.com.</P
><P
>To gain access via anonymous cvs use the following steps.
For this example it is assumed that you want a copy of the
samba source code. For the other source code repositories
on this system just substitute the correct package name</P
><P
></P
><OL
TYPE="1"
><LI
><P
> Install a recent copy of cvs. All you really need is a
copy of the cvs client binary.
</P
></LI
><LI
><P
> Run the command
</P
><P
> <B
CLASS="COMMAND"
>cvs -d :pserver:cvs@samba.org:/cvsroot login</B
>
</P
><P
> When it asks you for a password type <TT
CLASS="USERINPUT"
><B
>cvs</B
></TT
>.
</P
></LI
><LI
><P
> Run the command
</P
><P
> <B
CLASS="COMMAND"
>cvs -d :pserver:cvs@samba.org:/cvsroot co samba</B
>
</P
><P
> This will create a directory called samba containing the
latest samba source code (i.e. the HEAD tagged cvs branch). This
currently corresponds to the 3.0 development tree.
</P
><P
> CVS branches other HEAD can be obtained by using the <TT
CLASS="PARAMETER"
><I
>-r</I
></TT
>
and defining a tag name. A list of branch tag names can be found on the
"Development" page of the samba web site. A common request is to obtain the
latest 2.2 release code. This could be done by using the following command.
</P
><P
> <B
CLASS="COMMAND"
>cvs -d :pserver:cvs@samba.org:/cvsroot co -r SAMBA_2_2 samba</B
>
</P
></LI
><LI
><P
> Whenever you want to merge in the latest code changes use
the following command from within the samba directory:
</P
><P
> <B
CLASS="COMMAND"
>cvs update -d -P</B
>
</P
></LI
></OL
></DIV
></DIV
></DIV
><HR><H1
><A
NAME="AEN2050"
>Index</A
></H1
><DL
><DT
>Primary Domain Controller,
<A
HREF="x1098.htm"
>Background</A
>
</DT
></DL
></DIV
></BODY
></HTML
>
|
