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<HTML
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>SAMBA Project Documentation</TITLE
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><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
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>1. <A
HREF="#AEN10"
>How to Install and Test SAMBA</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN12"
>Step 0: Read the man pages</A
></DT
><DT
><A
HREF="#AEN20"
>Step 1: Building the Binaries</A
></DT
><DT
><A
HREF="#AEN48"
>Step 2: The all important step</A
></DT
><DT
><A
HREF="#AEN52"
>Step 3: Create the smb configuration file.</A
></DT
><DT
><A
HREF="#AEN66"
>Step 4: Test your config file with
<B
CLASS="COMMAND"
>testparm</B
></A
></DT
><DT
><A
HREF="#AEN72"
>Step 5: Starting the smbd and nmbd</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN82"
>Step 5a: Starting from inetd.conf</A
></DT
><DT
><A
HREF="#AEN111"
>Step 5b. Alternative: starting it as a daemon</A
></DT
></DL
></DD
><DT
><A
HREF="#AEN127"
>Step 6: Try listing the shares available on your
server</A
></DT
><DT
><A
HREF="#AEN136"
>Step 7: Try connecting with the unix client</A
></DT
><DT
><A
HREF="#AEN152"
>Step 8: Try connecting from a DOS, WfWg, Win9x, WinNT,
Win2k, OS/2, etc... client</A
></DT
><DT
><A
HREF="#AEN166"
>What If Things Don't Work?</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN171"
>Diagnosing Problems</A
></DT
><DT
><A
HREF="#AEN175"
>Scope IDs</A
></DT
><DT
><A
HREF="#AEN178"
>Choosing the Protocol Level</A
></DT
><DT
><A
HREF="#AEN187"
>Printing from UNIX to a Client PC</A
></DT
><DT
><A
HREF="#AEN191"
>Locking</A
></DT
><DT
><A
HREF="#AEN201"
>Mapping Usernames</A
></DT
><DT
><A
HREF="#AEN204"
>Other Character Sets</A
></DT
></DL
></DD
></DL
></DD
><DT
>2. <A
HREF="#AEN207"
>LanMan and NT Password Encryption in Samba 2.x</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN218"
>Introduction</A
></DT
><DT
><A
HREF="#AEN222"
>How does it work?</A
></DT
><DT
><A
HREF="#AEN233"
>Important Notes About Security</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN252"
>Advantages of SMB Encryption</A
></DT
><DT
><A
HREF="#AEN259"
>Advantages of non-encrypted passwords</A
></DT
></DL
></DD
><DT
><A
HREF="#AEN268"
><A
NAME="SMBPASSWDFILEFORMAT"
></A
>The smbpasswd file</A
></DT
><DT
><A
HREF="#AEN320"
>The smbpasswd Command</A
></DT
><DT
><A
HREF="#AEN359"
>Setting up Samba to support LanManager Encryption</A
></DT
></DL
></DD
><DT
>3. <A
HREF="#AEN374"
>Hosting a Microsoft Distributed File System tree on Samba</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN385"
>Instructions</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN419"
>Notes</A
></DT
></DL
></DD
></DL
></DD
><DT
>4. <A
HREF="#AEN428"
>Printing Support in Samba 2.2.x</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN439"
>Introduction</A
></DT
><DT
><A
HREF="#AEN456"
>Configuration</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN510"
>Support a large number of printers</A
></DT
></DL
></DD
><DT
><A
HREF="#AEN521"
>The Imprints Toolset</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN525"
>What is Imprints?</A
></DT
><DT
><A
HREF="#AEN535"
>Creating Printer Driver Packages</A
></DT
><DT
><A
HREF="#AEN538"
>The Imprints server</A
></DT
><DT
><A
HREF="#AEN542"
>The Installation Client</A
></DT
></DL
></DD
><DT
><A
HREF="#AEN564"
><A
NAME="MIGRATION"
></A
>Migration to from Samba 2.0.x to
2.2.x</A
></DT
></DL
></DD
><DT
>5. <A
HREF="#AEN593"
>security = domain in Samba 2.x</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN604"
>Joining an NT Domain with Samba 2.2</A
></DT
><DT
><A
HREF="#AEN667"
>Why is this better than security = server?</A
></DT
></DL
></DD
><DT
>6. <A
HREF="#AEN681"
>Unifed Logons between Windows NT and UNIX using Winbind</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN699"
>Abstract</A
></DT
><DT
><A
HREF="#AEN703"
>Introduction</A
></DT
><DT
><A
HREF="#AEN716"
>What Winbind Provides</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN723"
>Target Uses</A
></DT
></DL
></DD
><DT
><A
HREF="#AEN727"
>How Winbind Works</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN732"
>Microsoft Remote Procedure Calls</A
></DT
><DT
><A
HREF="#AEN736"
>Name Service Switch</A
></DT
><DT
><A
HREF="#AEN752"
>Pluggable Authentication Modules</A
></DT
><DT
><A
HREF="#AEN760"
>User and Group ID Allocation</A
></DT
><DT
><A
HREF="#AEN764"
>Result Caching</A
></DT
></DL
></DD
><DT
><A
HREF="#AEN767"
>Installation and Configuration</A
></DT
><DT
><A
HREF="#AEN773"
>Limitations</A
></DT
><DT
><A
HREF="#AEN785"
>Conclusion</A
></DT
></DL
></DD
><DT
>7. <A
HREF="#AEN788"
>UNIX Permission Bits and WIndows NT Access Control Lists</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN799"
>Viewing and changing UNIX permissions using the NT
security dialogs</A
></DT
><DT
><A
HREF="#AEN808"
>How to view file security on a Samba share</A
></DT
><DT
><A
HREF="#AEN819"
>Viewing file ownership</A
></DT
><DT
><A
HREF="#AEN839"
>Viewing file or directory permissions</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN854"
>File Permissions</A
></DT
><DT
><A
HREF="#AEN868"
>Directory Permissions</A
></DT
></DL
></DD
><DT
><A
HREF="#AEN875"
>Modifying file or directory permissions</A
></DT
><DT
><A
HREF="#AEN897"
>Interaction with the standard Samba create mask
parameters</A
></DT
><DT
><A
HREF="#AEN961"
>Interaction with the standard Samba file attribute
mapping</A
></DT
></DL
></DD
></DL
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="AEN10"
>Chapter 1. How to Install and Test SAMBA</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN12"
>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="AEN20"
>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 exectuting</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="AEN48"
>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="AEN52"
>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
><PRE
CLASS="PROGRAMLISTING"
> [global]
workgroup = MYGROUP
[homes]
guest ok = no
read only = no
</PRE
></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 defails)</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="AEN66"
>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
resonable before proceeding. </P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN72"
>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
> as a daemon is that they will
respond slightly more quickly to an initial connection
request. This is, however, unlikely to be a problem.</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN82"
>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
><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
></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 consistant.</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 somunixes. 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="AEN111"
>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
><PRE
CLASS="PROGRAMLISTING"
> #!/bin/sh
/usr/local/samba/bin/smbd -D
/usr/local/samba/bin/nmbd -D
</PRE
></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="AEN127"
>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="AEN136"
>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="AEN152"
>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="AEN166"
>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="AEN171"
>Diagnosing Problems</A
></H2
><P
>If you have instalation 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="AEN175"
>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="AEN178"
>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="AEN187"
>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="AEN191"
>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
>Samba supports "record locking" using the fcntl() unix system
call. This is often implemented using rpc calls to a rpc.lockd process
running on the system that owns the filesystem. Unfortunately many
rpc.lockd implementations are very buggy, particularly when made to
talk to versions from other vendors. It is not uncommon for the
rpc.lockd to crash.</P
><P
>There is also a problem translating the 32 bit lock
requests generated by PC clients to 31 bit requests supported
by most unixes. Unfortunately many PC applications (typically
OLE2 applications) use byte ranges with the top bit set
as semaphore sets. Samba attempts translation to support
these types of applications, and the translation has proved
to be quite successful.</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 compatability 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="AEN201"
>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="AEN204"
>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 recommmend 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="AEN207"
>Chapter 2. LanMan and NT Password Encryption in Samba 2.x</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN218"
>Introduction</A
></H1
><P
>With the development of LanManager and Windows NT
compatible password encryption for Samba, it is now able
to validate user connections in exactly the same way as
a LanManager or Windows NT server.</P
><P
>This document describes how the SMB password encryption
algorithm works and what issues there are in choosing whether
you want to use it. You should read it carefully, especially
the part about security and the "PROS and CONS" section.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN222"
>How does it work?</A
></H1
><P
>LanManager encryption is somewhat similar to UNIX
password encryption. The server uses a file containing a
hashed value of a user's password. This is created by taking
the user's plaintext password, capitalising it, and either
truncating to 14 bytes or padding to 14 bytes with null bytes.
This 14 byte value is used as two 56 bit DES keys to encrypt
a 'magic' eight byte value, forming a 16 byte value which is
stored by the server and client. Let this value be known as
the "hashed password".</P
><P
>Windows NT encryption is a higher quality mechanism,
consisting of doing an MD4 hash on a Unicode version of the user's
password. This also produces a 16 byte hash value that is
non-reversible.</P
><P
>When a client (LanManager, Windows for WorkGroups, Windows
95 or Windows NT) wishes to mount a Samba drive (or use a Samba
resource), it first requests a connection and negotiates the
protocol that the client and server will use. In the reply to this
request the Samba server generates and appends an 8 byte, random
value - this is stored in the Samba server after the reply is sent
and is known as the "challenge". The challenge is different for
every client connection.</P
><P
>The client then uses the hashed password (16 byte values
described above), appended with 5 null bytes, as three 56 bit
DES keys, each of which is used to encrypt the challenge 8 byte
value, forming a 24 byte value known as the "response".</P
><P
>In the SMB call SMBsessionsetupX (when user level security
is selected) or the call SMBtconX (when share level security is
selected), the 24 byte response is returned by the client to the
Samba server. For Windows NT protocol levels the above calculation
is done on both hashes of the user's password and both responses are
returned in the SMB call, giving two 24 byte values.</P
><P
>The Samba server then reproduces the above calculation, using
its own stored value of the 16 byte hashed password (read from the
<TT
CLASS="FILENAME"
>smbpasswd</TT
> file - described later) and the challenge
value that it kept from the negotiate protocol reply. It then checks
to see if the 24 byte value it calculates matches the 24 byte value
returned to it from the client.</P
><P
>If these values match exactly, then the client knew the
correct password (or the 16 byte hashed value - see security note
below) and is thus allowed access. If not, then the client did not
know the correct password and is denied access.</P
><P
>Note that the Samba server never knows or stores the cleartext
of the user's password - just the 16 byte hashed values derived from
it. Also note that the cleartext password or 16 byte hashed values
are never transmitted over the network - thus increasing security.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN233"
>Important Notes About Security</A
></H1
><P
>The unix and SMB password encryption techniques seem similar
on the surface. This similarity is, however, only skin deep. The unix
scheme typically sends clear text passwords over the nextwork when
logging in. This is bad. The SMB encryption scheme never sends the
cleartext password over the network but it does store the 16 byte
hashed values on disk. This is also bad. Why? Because the 16 byte hashed
values are a "password equivalent". You cannot derive the user's
password from them, but they could potentially be used in a modified
client to gain access to a server. This would require considerable
technical knowledge on behalf of the attacker but is perfectly possible.
You should thus treat the smbpasswd file as though it contained the
cleartext passwords of all your users. Its contents must be kept
secret, and the file should be protected accordingly.</P
><P
>Ideally we would like a password scheme which neither requires
plain text passwords on the net or on disk. Unfortunately this
is not available as Samba is stuck with being compatible with
other SMB systems (WinNT, WfWg, Win95 etc). </P
><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
>Note that Windows NT 4.0 Service pack 3 changed the
default for permissible authentication so that plaintext
passwords are <I
CLASS="EMPHASIS"
>never</I
> sent over the wire.
The solution to this is either to switch to encrypted passwords
with Samba or edit the Windows NT registry to re-enable plaintext
passwords. See the document WinNT.txt for details on how to do
this.</P
><P
>Other Microsoft operating systems which also exhibit
this behavior includes</P
><P
></P
><UL
><LI
><P
>MS DOS Network client 3.0 with
the basic network redirector installed</P
></LI
><LI
><P
>Windows 95 with the network redirector
update installed</P
></LI
><LI
><P
>Windows 98 [se]</P
></LI
><LI
><P
>Windows 2000</P
></LI
></UL
><P
><I
CLASS="EMPHASIS"
>Note :</I
>All current release of
Microsoft SMB/CIFS clients support authentication via the
SMB Challenge/Response mechanism described here. Enabling
clear text authentication does not disable the ability
of the client to particpate in encrypted authentication.</P
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN252"
>Advantages of SMB Encryption</A
></H2
><P
></P
><UL
><LI
><P
>plain text passwords are not passed across
the network. Someone using a network sniffer cannot just
record passwords going to the SMB server.</P
></LI
><LI
><P
>WinNT doesn't like talking to a server
that isn't using SMB encrypted passwords. It will refuse
to browse the server if the server is also in user level
security mode. It will insist on prompting the user for the
password on each connection, which is very annoying. The
only things you can do to stop this is to use SMB encryption.
</P
></LI
></UL
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN259"
>Advantages of non-encrypted passwords</A
></H2
><P
></P
><UL
><LI
><P
>plain text passwords are not kept
on disk. </P
></LI
><LI
><P
>uses same password file as other unix
services such as login and ftp</P
></LI
><LI
><P
>you are probably already using other
services (such as telnet and ftp) which send plain text
passwords over the net, so sending them for SMB isn't
such a big deal.</P
></LI
></UL
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN268"
><A
NAME="SMBPASSWDFILEFORMAT"
></A
>The smbpasswd file</A
></H1
><P
>In order for Samba to participate in the above protocol
it must be able to look up the 16 byte hashed values given a user name.
Unfortunately, as the UNIX password value is also a one way hash
function (ie. it is impossible to retrieve the cleartext of the user's
password given the UNIX hash of it), a separate password file
containing this 16 byte value must be kept. To minimise problems with
these two password files, getting out of sync, the UNIX <TT
CLASS="FILENAME"
> /etc/passwd</TT
> and the <TT
CLASS="FILENAME"
>smbpasswd</TT
> file,
a utility, <B
CLASS="COMMAND"
>mksmbpasswd.sh</B
>, is provided to generate
a smbpasswd file from a UNIX <TT
CLASS="FILENAME"
>/etc/passwd</TT
> file.
</P
><P
>To generate the smbpasswd file from your <TT
CLASS="FILENAME"
>/etc/passwd
</TT
> file use the following command :</P
><P
><TT
CLASS="PROMPT"
>$ </TT
><TT
CLASS="USERINPUT"
><B
>cat /etc/passwd | mksmbpasswd.sh
> /usr/local/samba/private/smbpasswd</B
></TT
></P
><P
>If you are running on a system that uses NIS, use</P
><P
><TT
CLASS="PROMPT"
>$ </TT
><TT
CLASS="USERINPUT"
><B
>ypcat passwd | mksmbpasswd.sh
> /usr/local/samba/private/smbpasswd</B
></TT
></P
><P
>The <B
CLASS="COMMAND"
>mksmbpasswd.sh</B
> program is found in
the Samba source directory. By default, the smbpasswd file is
stored in :</P
><P
><TT
CLASS="FILENAME"
>/usr/local/samba/private/smbpasswd</TT
></P
><P
>The owner of the <TT
CLASS="FILENAME"
>/usr/local/samba/private/</TT
>
directory should be set to root, and the permissions on it should
be set to 0500 (<B
CLASS="COMMAND"
>chmod 500 /usr/local/samba/private</B
>).
</P
><P
>Likewise, the smbpasswd file inside the private directory should
be owned by root and the permissions on is should be set to 0600
(<B
CLASS="COMMAND"
>chmod 600 smbpasswd</B
>).</P
><P
>The format of the smbpasswd file is (The line has been
wrapped here. It should appear as one entry per line in
your smbpasswd file.)</P
><P
><PRE
CLASS="PROGRAMLISTING"
>username:uid:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:
[Account type]:LCT-<last-change-time>:Long name
</PRE
></P
><P
>Although only the <TT
CLASS="REPLACEABLE"
><I
>username</I
></TT
>,
<TT
CLASS="REPLACEABLE"
><I
>uid</I
></TT
>, <TT
CLASS="REPLACEABLE"
><I
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX</I
></TT
>,
[<TT
CLASS="REPLACEABLE"
><I
>Account type</I
></TT
>] and <TT
CLASS="REPLACEABLE"
><I
> last-change-time</I
></TT
> sections are significant
and are looked at in the Samba code.</P
><P
>It is <I
CLASS="EMPHASIS"
>VITALLY</I
> important that there by 32
'X' characters between the two ':' characters in the XXX sections -
the smbpasswd and Samba code will fail to validate any entries that
do not have 32 characters between ':' characters. The first XXX
section is for the Lanman password hash, the second is for the
Windows NT version.</P
><P
>When the password file is created all users have password entries
consisting of 32 'X' characters. By default this disallows any access
as this user. When a user has a password set, the 'X' characters change
to 32 ascii hexadecimal digits (0-9, A-F). These are an ascii
representation of the 16 byte hashed value of a user's password.</P
><P
>To set a user to have no password (not recommended), edit the file
using vi, and replace the first 11 characters with the ascii text
<TT
CLASS="CONSTANT"
>"NO PASSWORD"</TT
> (minus the quotes).</P
><P
>For example, to clear the password for user bob, his smbpasswd file
entry would look like :</P
><P
><PRE
CLASS="PROGRAMLISTING"
> bob:100:NO PASSWORDXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[U ]:LCT-00000000:Bob's full name:/bobhome:/bobshell
</PRE
></P
><P
>If you are allowing users to use the smbpasswd command to set
their own passwords, you may want to give users NO PASSWORD initially
so they do not have to enter a previous password when changing to their
new password (not recommended). In order for you to allow this the
<B
CLASS="COMMAND"
>smbpasswd</B
> program must be able to connect to the
<B
CLASS="COMMAND"
>smbd</B
> daemon as that user with no password. Enable this
by adding the line :</P
><P
><B
CLASS="COMMAND"
>null passwords = yes</B
></P
><P
>to the [global] section of the smb.conf file (this is why
the above scenario is not recommended). Preferably, allocate your
users a default password to begin with, so you do not have
to enable this on your server.</P
><P
><I
CLASS="EMPHASIS"
>Note : </I
>This file should be protected very
carefully. Anyone with access to this file can (with enough knowledge of
the protocols) gain access to your SMB server. The file is thus more
sensitive than a normal unix <TT
CLASS="FILENAME"
>/etc/passwd</TT
> file.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN320"
>The smbpasswd Command</A
></H1
><P
>The smbpasswd command maintains the two 32 byte password fields
in the smbpasswd file. If you wish to make it similar to the unix
<B
CLASS="COMMAND"
>passwd</B
> or <B
CLASS="COMMAND"
>yppasswd</B
> programs,
install it in <TT
CLASS="FILENAME"
>/usr/local/samba/bin/</TT
> (or your
main Samba binary directory).</P
><P
>Note that as of Samba 1.9.18p4 this program <I
CLASS="EMPHASIS"
>MUST NOT
BE INSTALLED</I
> setuid root (the new <B
CLASS="COMMAND"
>smbpasswd</B
>
code enforces this restriction so it cannot be run this way by
accident).</P
><P
><B
CLASS="COMMAND"
>smbpasswd</B
> now works in a client-server mode
where it contacts the local smbd to change the user's password on its
behalf. This has enormous benefits - as follows.</P
><P
></P
><UL
><LI
><P
>smbpasswd no longer has to be setuid root -
an enormous range of potential security problems is
eliminated.</P
></LI
><LI
><P
><B
CLASS="COMMAND"
>smbpasswd</B
> now has the capability
to change passwords on Windows NT servers (this only works when
the request is sent to the NT Primary Domain Controller if you
are changing an NT Domain user's password).</P
></LI
></UL
><P
>To run smbpasswd as a normal user just type :</P
><P
><TT
CLASS="PROMPT"
>$ </TT
><TT
CLASS="USERINPUT"
><B
>smbpasswd</B
></TT
></P
><P
><TT
CLASS="PROMPT"
>Old SMB password: </TT
><TT
CLASS="USERINPUT"
><B
><type old value here -
or hit return if there was no old password></B
></TT
></P
><P
><TT
CLASS="PROMPT"
>New SMB Password: </TT
><TT
CLASS="USERINPUT"
><B
><type new value>
</B
></TT
></P
><P
><TT
CLASS="PROMPT"
>Repeat New SMB Password: </TT
><TT
CLASS="USERINPUT"
><B
><re-type new value
</B
></TT
></P
><P
>If the old value does not match the current value stored for
that user, or the two new values do not match each other, then the
password will not be changed.</P
><P
>If invoked by an ordinary user it will only allow the user
to change his or her own Samba password.</P
><P
>If run by the root user smbpasswd may take an optional
argument, specifying the user name whose SMB password you wish to
change. Note that when run as root smbpasswd does not prompt for
or check the old password value, thus allowing root to set passwords
for users who have forgotten their passwords.</P
><P
><B
CLASS="COMMAND"
>smbpasswd</B
> is designed to work in the same way
and be familiar to UNIX users who use the <B
CLASS="COMMAND"
>passwd</B
> or
<B
CLASS="COMMAND"
>yppasswd</B
> commands.</P
><P
>For more details on using <B
CLASS="COMMAND"
>smbpasswd</B
> refer
to the man page which will always be the definitive reference.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN359"
>Setting up Samba to support LanManager Encryption</A
></H1
><P
>This is a very brief description on how to setup samba to
support password encryption. </P
><P
></P
><OL
TYPE="1"
><LI
><P
>compile and install samba as usual</P
></LI
><LI
><P
>enable encrypted passwords in <TT
CLASS="FILENAME"
> smb.conf</TT
> by adding the line <B
CLASS="COMMAND"
>encrypt
passwords = yes</B
> in the [global] section</P
></LI
><LI
><P
>create the initial <TT
CLASS="FILENAME"
>smbpasswd</TT
>
password file in the place you specified in the Makefile
(--prefix=<dir>). See the notes under the <A
HREF="#SMBPASSWDFILEFORMAT"
>The smbpasswd File</A
>
section earlier in the document for details.</P
></LI
></OL
><P
>Note that you can test things using smbclient.</P
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="AEN374"
>Chapter 3. Hosting a Microsoft Distributed File System tree on Samba</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN385"
>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
>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
><PRE
CLASS="PROGRAMLISTING"
># The smb.conf file:
[global]
netbios name = SAMBA
host msdfs = yes
[dfs]
path = /export/dfsroot
msdfs root = yes
</PRE
></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="AEN419"
>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="AEN428"
>Chapter 4. Printing Support in Samba 2.2.x</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN439"
>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 <A
HREF="http://imprints.sourceforge.net"
TARGET="_top"
>Imprints tool set
</A
></P
></LI
><LI
><P
>Support for the native MS-RPC printing
calls such as StartDocPrinter, EnumJobs(), etc... (See
the <A
HREF="http://msdn.microsoft.com/"
TARGET="_top"
>MSDN documentation
</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
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN456"
>Configuration</A
></H1
><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
><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
>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
><P
>You should modify the server's smb.conf file 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
><PRE
CLASS="PROGRAMLISTING"
>[print$]
path = /usr/local/samba/printers
guest ok = yes
browseable = yes
read only = yes
write list = ntadmin
</PRE
></P
><P
>The <A
HREF="smb.conf.5.html#WRITELIST"
TARGET="_top"
><TT
CLASS="PARAMETER"
><I
> write list</I
></TT
></A
> is used to allow administrative
level user accounts to have write access in order to update files
on the share. See the <A
HREF="smb./conf.5.html"
TARGET="_top"
> smb.conf(5) man page</A
> for more information on
configuring file shares.</P
><P
>The requirement for <A
HREF="smb.conf.5.html#GUESTOK"
TARGET="_top"
><B
CLASS="COMMAND"
> guest ok = yes</B
></A
> depends upon how your
site is configured. If users will be guaranteed to have
an account on the Samba host, then this is a non-issue.</P
><P
><I
CLASS="EMPHASIS"
>author's note: </I
>The non-issue is that
if all your Windows NT users are guarenteed to be authenticated
by the Samba server (such as a domain member server and the NT
user has already been validated by the Domain Controller in
order to logon to the Windows NT console), then guest access
is not necessary. Of course, in a workgroup environment where
you just want to be able to print without worrying about
silly accounts and security, then configure the share for
guest access. You'll probably want to add <A
HREF="smb.conf.5.html#MAPTOGUEST"
TARGET="_top"
><B
CLASS="COMMAND"
>map to guest = Bad User
</B
></A
> in the [global] section as well. Make sure
you understand what this parameter does before using it
though. --jerry]</P
><P
>In order for a Windows NT print server to support
the downloading of driver files by multiple client architectures,
it must create subdirectories within the [print$] 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$] share
for each architecture you wish to support.</P
><P
><PRE
CLASS="PROGRAMLISTING"
> [print$]-----
|-W32X86 ; "Windows NT x86"
|-WIN40 ; "Windows 95/98"
|-W32ALPHA ; "Windows NT Alpha_AXP"
|-W32MIPS ; "Windows NT R4000"
|-W32PPC ; "Windows NT PowerPC"
</PRE
></P
><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
><I
CLASS="EMPHASIS"
>ATTENTION! REQUIRED PERMISSIONS</I
></P
><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"
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$].</P
></TD
></TR
></TABLE
></DIV
><P
>Once you have created the required [print$] 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
><P
>The initial listing of printers in the Samba host's
Printers folder will have no printer driver assigned to them.
The way assign a driver to a printer is to view the Properties
of the printer and 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
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN510"
>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
><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%bleaK.er \
<TT
CLASS="PROMPT"
>> </TT
> -c "setdriver hp-print \"HP LaserJet 4000 Series PS\""
Domain=[NARNIA] OS=[Unix] Server=[Samba 2.2.0-alpha3]
Succesfully set hp-print to driver HP LaserJet 4000 Series PS.
</PRE
></P
></DIV
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN521"
>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="AEN525"
>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="AEN535"
>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="AEN538"
>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
<I
CLASS="EMPHASIS"
>not</I
> recommended that this security check
be disabled.</P
></DIV
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN542"
>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
><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
></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 callsits 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. The 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="AEN564"
><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 2.2.0 over prior releases,
migration from an existing setup to 2.2.0 can follow
several paths.</P
><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
>The following smb.conf parameters are considered to be
depreciated 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
>Here are the possible scenarios for supporting 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
printers.def 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 moved to the "this tool is the old way of doing it"
pile.</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 smbclient and
rpcclient. See the <A
HREF="http://imprints.sourceforge.net/"
TARGET="_top"
> Imprints insrallation client</A
> for an example.
</P
></LI
></UL
></DIV
></DIV
><DIV
CLASS="CHAPTER"
><HR><H1
><A
NAME="AEN593"
>Chapter 5. security = domain in Samba 2.x</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN604"
>Joining an NT Domain with Samba 2.2</A
></H1
><P
>In order for a Samba-2 server to join an NT domain,
you must first add the NetBIOS name of the Samba server to the
NT domain on the PDC using Server Manager for Domains. This creates
the machine account in the domain (PDC) SAM. Note that you should
add the Samba server as a "Windows NT Workstation or Server",
<I
CLASS="EMPHASIS"
>NOT</I
> as a Primary or backup domain controller.</P
><P
>Assume you have a Samba-2 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
</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. 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
>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="AEN667"
>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#SECURITYEQUALSERVER"
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
>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
><I
CLASS="EMPHASIS"
>NOTE:</I
> 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="AEN681"
>Chapter 6. Unifed Logons between Windows NT and UNIX using Winbind</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN699"
>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 <I
CLASS="EMPHASIS"
>winbind
</I
>, a component of the Samba suite of programs as a
solution to the unied 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="AEN703"
>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 which
can lead to synchronization problems between the UNIX and Windows
systems and confusion for users.</P
><P
>We divide the unifed 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 unifed logon
problem.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN716"
>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 specied 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 a 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 as all passwords are stored in a single
location (on the domain controller).</P
><DIV
CLASS="SECT2"
><HR><H2
CLASS="SECT2"
><A
NAME="AEN723"
>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 simplies
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="AEN727"
>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="AEN732"
>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="AEN736"
>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 dierent sources. For example, a standalone
UNIX workstation may resolve system information from a series of
flat files stored on the local lesystem. A networked workstation
may first attempt to resolve system information from local files,
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 le 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 andin 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="AEN752"
>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 dierent 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 eect directly on the Primary Domain Controller.
</P
><P
>PAM is congured 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="AEN760"
>User and Group ID Allocation</A
></H2
><P
>When a user or group is created under Windows NT
is it allocated a numerical relative identier (RID). This is
slightly dierent to UNIX which has a range of numbers which 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 congured 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
a 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="AEN764"
>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 modied. 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="AEN767"
>Installation and Configuration</A
></H1
><P
>The easiest way to install winbind is by using the packages
provided in the <TT
CLASS="FILENAME"
>pub/samba/appliance/</TT
>
directory on your nearest
Samba mirror. These packages provide snapshots of the Samba source
code and binaries already setup to provide the full functionality
of winbind. This setup is a little more complex than a normal Samba
build as winbind needs a small amount of functionality from a
development code branch called SAMBA_TNG.</P
><P
>Once you have installed the packages you should read
the <B
CLASS="COMMAND"
>winbindd(8)</B
> man page which will provide you
with conguration information and give you sample conguration files.
You may also wish to update the main Samba daemons smbd and nmbd)
with a more recent development release, such as the recently
announced Samba 2.2 alpha release.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN773"
>Limitations</A
></H1
><P
>Winbind has a number of limitations in its current
released version which 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
><LI
><P
>Building winbind from source is currently
quite tedious as it requires combining source code from two Samba
branches. Work is underway to solve this by providing all
the necessary functionality in the main Samba code branch.</P
></LI
></UL
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN785"
>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="AEN788"
>Chapter 7. UNIX Permission Bits and WIndows NT Access Control Lists</A
></H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN799"
>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#NTACLSUPPOR"
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="AEN808"
>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 <I
CLASS="EMPHASIS"
>Properties</I
> 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 <I
CLASS="EMPHASIS"
>Security</I
>. Click on this tab and you
will see three buttons, <I
CLASS="EMPHASIS"
>Permissions</I
>,
<I
CLASS="EMPHASIS"
>Auditing</I
>, and <I
CLASS="EMPHASIS"
>Ownership</I
>.
The <I
CLASS="EMPHASIS"
>Auditing</I
> 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="AEN819"
>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 discriptive 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 privilaged
operation in UNIX, available only to the <I
CLASS="EMPHASIS"
>root</I
>
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 privillage 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 <I
CLASS="EMPHASIS"
>Seclib
</I
> 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="AEN839"
>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 discriptive 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="AEN854"
>File Permissions</A
></H2
><P
>The standard UNIX user/group/world triple and
the correspinding "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="AEN868"
>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="AEN875"
>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 proceedure 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 (dsplayed as <B
CLASS="COMMAND"
>"O"
</B
>) highlighted.</P
></DIV
><DIV
CLASS="SECT1"
><HR><H1
CLASS="SECT1"
><A
NAME="AEN897"
>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 <I
CLASS="EMPHASIS"
>not</I
>
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="AEN961"
>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
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></HTML
>
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