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|
<HTML
><HEAD
><TITLE
>smbd</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.57"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><H1
><A
NAME="SMBD"
>smbd</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5"
></A
><H2
>Name</H2
>smbd -- server to provide SMB/CIFS services to clients</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN8"
></A
><H2
>Synopsis</H2
><P
><B
CLASS="COMMAND"
>smbd</B
> [-D] [-a] [-o] [-P] [-h] [-V] [-b] [-d <debug level>] [-l <log directory>] [-p <port number>] [-O <socket option>] [-s <configuration file>]</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN23"
></A
><H2
>DESCRIPTION</H2
><P
>This program is part of the Samba suite.</P
><P
><B
CLASS="COMMAND"
>smbd</B
> is the server daemon that
provides filesharing and printing services to Windows clients.
The server provides filespace and printer services to
clients using the SMB (or CIFS) protocol. This is compatible
with the LanManager protocol, and can service LanManager
clients. These include MSCLIENT 3.0 for DOS, Windows for
Workgroups, Windows 95/98/ME, Windows NT, Windows 2000,
OS/2, DAVE for Macintosh, and smbfs for Linux.</P
><P
>An extensive description of the services that the
server can provide is given in the man page for the
configuration file controlling the attributes of those
services (see <A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
>smb.conf(5)
</TT
></A
>. This man page will not describe the
services, but will concentrate on the administrative aspects
of running the server.</P
><P
>Please note that there are significant security
implications to running this server, and the <A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
>smb.conf(5)</TT
></A
>
manpage should be regarded as mandatory reading before
proceeding with installation.</P
><P
>A session is created whenever a client requests one.
Each client gets a copy of the server for each session. This
copy then services all connections made by the client during
that session. When all connections from its client are closed,
the copy of the server for that client terminates.</P
><P
>The configuration file, and any files that it includes,
are automatically reloaded every minute, if they change. You
can force a reload by sending a SIGHUP to the server. Reloading
the configuration file will not affect connections to any service
that is already established. Either the user will have to
disconnect from the service, or <B
CLASS="COMMAND"
>smbd</B
> killed and restarted.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN37"
></A
><H2
>OPTIONS</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>-D</DT
><DD
><P
>If specified, this parameter causes
the server to operate as a daemon. That is, it detaches
itself and runs in the background, fielding requests
on the appropriate port. Operating the server as a
daemon is the recommended way of running <B
CLASS="COMMAND"
>smbd</B
> for
servers that provide more than casual use file and
print services. This switch is assumed if <B
CLASS="COMMAND"
>smbd
</B
> is executed on the command line of a shell.
</P
></DD
><DT
>-a</DT
><DD
><P
>If this parameter is specified, each new
connection will append log messages to the log file.
This is the default.</P
></DD
><DT
>-o</DT
><DD
><P
>If this parameter is specified, the
log files will be overwritten when opened. By default,
<B
CLASS="COMMAND"
>smbd</B
> will append entries to the log
files.</P
></DD
><DT
>-P</DT
><DD
><P
>Passive option. Causes <B
CLASS="COMMAND"
>smbd</B
> not to
send any network traffic out. Used for debugging by
the developers only.</P
></DD
><DT
>-h</DT
><DD
><P
>Prints the help information (usage)
for <B
CLASS="COMMAND"
>smbd</B
>.</P
></DD
><DT
>-v</DT
><DD
><P
>Prints the version number for
<B
CLASS="COMMAND"
>smbd</B
>.</P
></DD
><DT
>-b</DT
><DD
><P
>Prints information about how
Samba was built.</P
></DD
><DT
>-d <debug level></DT
><DD
><P
><TT
CLASS="REPLACEABLE"
><I
>debuglevel</I
></TT
> is an integer
from 0 to 10. The default value if this parameter is
not specified is zero.</P
><P
>The higher this value, the more detail will be
logged to the log files about the activities of the
server. At level 0, only critical errors and serious
warnings will be logged. Level 1 is a reasonable level for
day to day running - it generates a small amount of
information about operations carried out.</P
><P
>Levels above 1 will generate considerable
amounts of log data, and should only be used when
investigating a problem. Levels above 3 are designed for
use only by developers and generate HUGE amounts of log
data, most of which is extremely cryptic.</P
><P
>Note that specifying this parameter here will
override the <A
HREF="smb.conf.5.html#loglevel"
TARGET="_top"
>log
level</A
> parameter in the <A
HREF="smb.conf.5.html"
TARGET="_top"
> <TT
CLASS="FILENAME"
>smb.conf(5)</TT
></A
> file.</P
></DD
><DT
>-l <log directory></DT
><DD
><P
>If specified,
<TT
CLASS="REPLACEABLE"
><I
>log directory</I
></TT
>
specifies a log directory into which the "log.smbd" log
file will be created for informational and debug
messages from the running server. The log
file generated is never removed by the server although
its size may be controlled by the <A
HREF="smb.conf.5.html#maxlogsize"
TARGET="_top"
>max log size</A
>
option in the <A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
> smb.conf(5)</TT
></A
> file.
</P
><P
>The default log directory is specified at
compile time.</P
></DD
><DT
>-O <socket options></DT
><DD
><P
>See the <A
HREF="smb.conf.5.html#socketoptions"
TARGET="_top"
>socket options</A
>
parameter in the <A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
>smb.conf(5)
</TT
></A
> file for details.</P
></DD
><DT
>-p <port number></DT
><DD
><P
><TT
CLASS="REPLACEABLE"
><I
>port number</I
></TT
> is a positive integer
value. The default value if this parameter is not
specified is 139.</P
><P
>This number is the port number that will be
used when making connections to the server from client
software. The standard (well-known) port number for the
SMB over TCP is 139, hence the default. If you wish to
run the server as an ordinary user rather than
as root, most systems will require you to use a port
number greater than 1024 - ask your system administrator
for help if you are in this situation.</P
><P
>In order for the server to be useful by most
clients, should you configure it on a port other
than 139, you will require port redirection services
on port 139, details of which are outlined in rfc1002.txt
section 4.3.5.</P
><P
>This parameter is not normally specified except
in the above situation.</P
></DD
><DT
>-s <configuration file></DT
><DD
><P
>The file specified contains the
configuration details required by the server. The
information in this file includes server-specific
information such as what printcap file to use, as well
as descriptions of all the services that the server is
to provide. See <A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
> smb.conf(5)</TT
></A
> for more information.
The default configuration file name is determined at
compile time.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN115"
></A
><H2
>FILES</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="FILENAME"
>/etc/inetd.conf</TT
></DT
><DD
><P
>If the server is to be run by the
<B
CLASS="COMMAND"
>inetd</B
> meta-daemon, this file
must contain suitable startup information for the
meta-daemon. See the section INSTALLATION below.
</P
></DD
><DT
><TT
CLASS="FILENAME"
>/etc/rc</TT
></DT
><DD
><P
>or whatever initialization script your
system uses).</P
><P
>If running the server as a daemon at startup,
this file will need to contain an appropriate startup
sequence for the server. See the section INSTALLATION
below.</P
></DD
><DT
><TT
CLASS="FILENAME"
>/etc/services</TT
></DT
><DD
><P
>If running the server via the
meta-daemon <B
CLASS="COMMAND"
>inetd</B
>, this file
must contain a mapping of service name (e.g., netbios-ssn)
to service port (e.g., 139) and protocol type (e.g., tcp).
See the section INSTALLATION below.</P
></DD
><DT
><TT
CLASS="FILENAME"
>/usr/local/samba/lib/smb.conf</TT
></DT
><DD
><P
>This is the default location of the
<A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
>smb.conf</TT
></A
>
server configuration file. Other common places that systems
install this file are <TT
CLASS="FILENAME"
>/usr/samba/lib/smb.conf</TT
>
and <TT
CLASS="FILENAME"
>/etc/smb.conf</TT
>.</P
><P
>This file describes all the services the server
is to make available to clients. See <A
HREF="smb.conf.5.html"
TARGET="_top"
> <TT
CLASS="FILENAME"
>smb.conf(5)</TT
></A
> for more information.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN148"
></A
><H2
>LIMITATIONS</H2
><P
>On some systems <B
CLASS="COMMAND"
>smbd</B
> cannot change uid back
to root after a setuid() call. Such systems are called
trapdoor uid systems. If you have such a system,
you will be unable to connect from a client (such as a PC) as
two different users at once. Attempts to connect the
second user will result in access denied or
similar.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN152"
></A
><H2
>ENVIRONMENT VARIABLES</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="ENVAR"
>PRINTER</TT
></DT
><DD
><P
>If no printer name is specified to
printable services, most systems will use the value of
this variable (or <TT
CLASS="CONSTANT"
>lp</TT
> if this variable is
not defined) as the name of the printer to use. This
is not specific to the server, however.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN161"
></A
><H2
>INSTALLATION</H2
><P
>The location of the server and its support files
is a matter for individual system administrators. The following
are thus suggestions only.</P
><P
>It is recommended that the server software be installed
under the <TT
CLASS="FILENAME"
>/usr/local/samba/</TT
> hierarchy,
in a directory readable by all, writeable only by root. The server
program itself should be executable by all, as users may wish to
run the server themselves (in which case it will of course run
with their privileges). The server should NOT be setuid. On some
systems it may be worthwhile to make <B
CLASS="COMMAND"
>smbd</B
> setgid to an empty group.
This is because some systems may have a security hole where daemon
processes that become a user can be attached to with a debugger.
Making the <B
CLASS="COMMAND"
>smbd</B
> file setgid to an empty group may prevent
this hole from being exploited. This security hole and the suggested
fix has only been confirmed on old versions (pre-kernel 2.0) of Linux
at the time this was written. It is possible that this hole only
exists in Linux, as testing on other systems has thus far shown them
to be immune.</P
><P
>The server log files should be put in a directory readable and
writeable only by root, as the log files may contain sensitive
information.</P
><P
>The configuration file should be placed in a directory
readable and writeable only by root, as the configuration file
controls security for the services offered by the server. The
configuration file can be made readable by all if desired, but
this is not necessary for correct operation of the server and is
not recommended. A sample configuration file <TT
CLASS="FILENAME"
>smb.conf.sample
</TT
> is supplied with the source to the server - this may
be renamed to <TT
CLASS="FILENAME"
>smb.conf</TT
> and modified to suit
your needs.</P
><P
>The remaining notes will assume the following:</P
><P
></P
><UL
><LI
><P
><B
CLASS="COMMAND"
>smbd</B
> (the server program)
installed in <TT
CLASS="FILENAME"
>/usr/local/samba/bin</TT
></P
></LI
><LI
><P
><TT
CLASS="FILENAME"
>smb.conf</TT
> (the configuration
file) installed in <TT
CLASS="FILENAME"
>/usr/local/samba/lib</TT
></P
></LI
><LI
><P
>log files stored in <TT
CLASS="FILENAME"
>/var/adm/smblogs
</TT
></P
></LI
></UL
><P
>The server may be run either as a daemon by users
or at startup, or it may be run from a meta-daemon such as
<B
CLASS="COMMAND"
>inetd</B
> upon request. If run as a daemon,
the server will always be ready, so starting sessions will be
faster. If run from a meta-daemon some memory will be saved and
utilities such as the tcpd TCP-wrapper may be used for extra
security. For serious use as file server it is recommended
that <B
CLASS="COMMAND"
>smbd</B
> be run as a daemon.</P
><P
>When you've decided, continue with either</P
><P
></P
><UL
><LI
><P
>RUNNING THE SERVER AS A DAEMON or</P
></LI
><LI
><P
>RUNNING THE SERVER ON REQUEST.</P
></LI
></UL
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN194"
></A
><H2
>RUNNING THE SERVER AS A DAEMON</H2
><P
>To run the server as a daemon from the command
line, simply put the <EM
>-D</EM
> option on the
command line. There is no need to place an ampersand at
the end of the command line - the <EM
>-D</EM
>
option causes the server to detach itself from the tty
anyway.</P
><P
>Any user can run the server as a daemon (execute
permissions permitting, of course). This is useful for
testing purposes, and may even be useful as a temporary
substitute for something like ftp. When run this way, however,
the server will only have the privileges of the user who ran
it.</P
><P
>To ensure that the server is run as a daemon whenever
the machine is started, and to ensure that it runs as root
so that it can serve multiple clients, you will need to modify
the system startup files. Wherever appropriate (for example, in
<TT
CLASS="FILENAME"
>/etc/rc</TT
>), insert the following line,
substituting port number, log file location, configuration file
location and debug level as desired:</P
><P
><B
CLASS="COMMAND"
>/usr/local/samba/bin/smbd -D -l /var/adm/smblogs/log
-s /usr/local/samba/lib/smb.conf</B
></P
><P
>(The above should appear in your initialization script
as a single line. Depending on your terminal characteristics,
it may not appear that way in this man page. If the above appears
as more than one line, please treat any newlines or indentation
as a single space or TAB character.)</P
><P
>If the options used at compile time are appropriate for
your system, all parameters except <EM
>-D</EM
> may
be omitted. See the section OPTIONS above.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN207"
></A
><H2
>RUNNING THE SERVER ON REQUEST</H2
><P
>If your system uses a meta-daemon such as <B
CLASS="COMMAND"
>inetd
</B
>, you can arrange to have the <B
CLASS="COMMAND"
>smbd</B
> server started
whenever a process attempts to connect to it. This requires several
changes to the startup files on the host machine. If you are
experimenting as an ordinary user rather than as root, you will
need the assistance of your system administrator to modify the
system files.</P
><P
>You will probably want to set up the NetBIOS name server
<A
HREF="nmbd.8.html"
TARGET="_top"
><B
CLASS="COMMAND"
>nmbd</B
></A
> at
the same time as <B
CLASS="COMMAND"
>smbd</B
>. To do this refer to the
man page for <A
HREF="nmbd.8.html"
TARGET="_top"
><B
CLASS="COMMAND"
>nmbd(8)</B
>
</A
>.</P
><P
>First, ensure that a port is configured in the file
<TT
CLASS="FILENAME"
>/etc/services</TT
>. The well-known port 139
should be used if possible, though any port may be used.</P
><P
>Ensure that a line similar to the following is in
<TT
CLASS="FILENAME"
>/etc/services</TT
>:</P
><P
><B
CLASS="COMMAND"
>netbios-ssn 139/tcp</B
></P
><P
>Note for NIS/YP users - you may need to rebuild the
NIS service maps rather than alter your local <TT
CLASS="FILENAME"
>/etc/services
</TT
> file.</P
><P
>Next, put a suitable line in the file <TT
CLASS="FILENAME"
>/etc/inetd.conf
</TT
> (in the unlikely event that you are using a meta-daemon
other than inetd, you are on your own). Note that the first item
in this line matches the service name in <TT
CLASS="FILENAME"
>/etc/services
</TT
>. Substitute appropriate values for your system
in this line (see <B
CLASS="COMMAND"
>inetd(8)</B
>):</P
><P
><B
CLASS="COMMAND"
>netbios-ssn stream tcp nowait root /usr/local/samba/bin/smbd
-d1 -l/var/adm/smblogs/log -s/usr/local/samba/lib/smb.conf</B
></P
><P
>(The above should appear in <TT
CLASS="FILENAME"
>/etc/inetd.conf</TT
>
as a single line. Depending on your terminal characteristics, it may
not appear that way in this man page. If the above appears as more
than one line, please treat any newlines or indentation as a single
space or TAB character.)</P
><P
>Note that there is no need to specify a port number here,
even if you are using a non-standard port number.</P
><P
>Lastly, edit the configuration file to provide suitable
services. To start with, the following two services should be
all you need:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="SCREEN"
> <TT
CLASS="COMPUTEROUTPUT"
> [homes]
writeable = yes
[printers]
writeable = no
printable = yes
path = /tmp
public = yes
</TT
>
</PRE
></TD
></TR
></TABLE
><P
>This will allow you to connect to your home directory
and print to any printer supported by the host (user privileges
permitting).</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN239"
></A
><H2
>PAM INTERACTION</H2
><P
>Samba uses PAM for authentication (when presented with a plaintext
password), for account checking (is this account disabled?) and for
session management. The degree too which samba supports PAM is restricted
by the limitations of the SMB protocol and the
<A
HREF="smb.conf.5.html#OBEYPAMRESRICTIONS"
TARGET="_top"
>obey pam restricions</A
>
smb.conf paramater. When this is set, the following restrictions apply:
</P
><P
></P
><UL
><LI
><P
><EM
>Account Validation</EM
>: All acccesses to a
samba server are checked
against PAM to see if the account is vaild, not disabled and is permitted to
login at this time. This also applies to encrypted logins.
</P
></LI
><LI
><P
><EM
>Session Management</EM
>: When not using share
level secuirty, users must pass PAM's session checks before access
is granted. Note however, that this is bypassed in share level secuirty.
Note also that some older pam configuration files may need a line
added for session support.
</P
></LI
></UL
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN250"
></A
><H2
>TESTING THE INSTALLATION</H2
><P
>If running the server as a daemon, execute it before
proceeding. If using a meta-daemon, either restart the system
or kill and restart the meta-daemon. Some versions of
<B
CLASS="COMMAND"
>inetd</B
> will reread their configuration
tables if they receive a HUP signal.</P
><P
>If your machine's name is <TT
CLASS="REPLACEABLE"
><I
>fred</I
></TT
> and your
name is <TT
CLASS="REPLACEABLE"
><I
>mary</I
></TT
>, you should now be able to connect
to the service <TT
CLASS="FILENAME"
>\\fred\mary</TT
>.
</P
><P
>To properly test and experiment with the server, we
recommend using the <B
CLASS="COMMAND"
>smbclient</B
> program (see
<A
HREF="smbclient.1.html"
TARGET="_top"
><B
CLASS="COMMAND"
>smbclient(1)</B
></A
>)
and also going through the steps outlined in the file
<TT
CLASS="FILENAME"
>DIAGNOSIS.txt</TT
> in the <TT
CLASS="FILENAME"
>docs/</TT
>
directory of your Samba installation.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN264"
></A
><H2
>VERSION</H2
><P
>This man page is correct for version 2.2 of
the Samba suite.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN267"
></A
><H2
>DIAGNOSTICS</H2
><P
>Most diagnostics issued by the server are logged
in a specified log file. The log file name is specified
at compile time, but may be overridden on the command line.</P
><P
>The number and nature of diagnostics available depends
on the debug level used by the server. If you have problems, set
the debug level to 3 and peruse the log files.</P
><P
>Most messages are reasonably self-explanatory. Unfortunately,
at the time this man page was created, there are too many diagnostics
available in the source code to warrant describing each and every
diagnostic. At this stage your best bet is still to grep the
source code and inspect the conditions that gave rise to the
diagnostics you are seeing.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN272"
></A
><H2
>SIGNALS</H2
><P
>Sending the <B
CLASS="COMMAND"
>smbd</B
> a SIGHUP will cause it to
reload its <TT
CLASS="FILENAME"
>smb.conf</TT
> configuration
file within a short period of time.</P
><P
>To shut down a user's <B
CLASS="COMMAND"
>smbd</B
> process it is recommended
that <B
CLASS="COMMAND"
>SIGKILL (-9)</B
> <EM
>NOT</EM
>
be used, except as a last resort, as this may leave the shared
memory area in an inconsistent state. The safe way to terminate
an <B
CLASS="COMMAND"
>smbd</B
> is to send it a SIGTERM (-15) signal and wait for
it to die on its own.</P
><P
>The debug log level of <B
CLASS="COMMAND"
>smbd</B
> may be raised
or lowered using <A
HREF="smbcontrol.1.html"
TARGET="_top"
><B
CLASS="COMMAND"
>smbcontrol(1)
</B
></A
> program (SIGUSR[1|2] signals are no longer used in
Samba 2.2). This is to allow transient problems to be diagnosed,
whilst still running at a normally low log level.</P
><P
>Note that as the signal handlers send a debug write,
they are not re-entrant in <B
CLASS="COMMAND"
>smbd</B
>. This you should wait until
<B
CLASS="COMMAND"
>smbd</B
> is in a state of waiting for an incoming SMB before
issuing them. It is possible to make the signal handlers safe
by un-blocking the signals before the select call and re-blocking
them after, however this would affect performance.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN289"
></A
><H2
>SEE ALSO</H2
><P
>hosts_access(5), <B
CLASS="COMMAND"
>inetd(8)</B
>,
<A
HREF="nmbd.8.html"
TARGET="_top"
><B
CLASS="COMMAND"
>nmbd(8)</B
></A
>,
<A
HREF="smb.conf.5.html"
TARGET="_top"
><TT
CLASS="FILENAME"
>smb.conf(5)</TT
>
</A
>, <A
HREF="smbclient.1.html"
TARGET="_top"
><B
CLASS="COMMAND"
>smbclient(1)
</B
></A
>, <A
HREF="testparm.1.html"
TARGET="_top"
><B
CLASS="COMMAND"
> testparm(1)</B
></A
>, <A
HREF="testprns.1.html"
TARGET="_top"
> <B
CLASS="COMMAND"
>testprns(1)</B
></A
>, and the Internet RFC's
<TT
CLASS="FILENAME"
>rfc1001.txt</TT
>, <TT
CLASS="FILENAME"
>rfc1002.txt</TT
>.
In addition the CIFS (formerly SMB) specification is available
as a link from the Web page <A
HREF="http://samba.org/cifs/"
TARGET="_top"
>
http://samba.org/cifs/</A
>.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN306"
></A
><H2
>AUTHOR</H2
><P
>The original Samba software and related utilities
were created by Andrew Tridgell. Samba is now developed
by the Samba Team as an Open Source project similar
to the way the Linux kernel is developed.</P
><P
>The original Samba man pages were written by Karl Auer.
The man page sources were converted to YODL format (another
excellent piece of Open Source software, available at
<A
HREF="ftp://ftp.icce.rug.nl/pub/unix/"
TARGET="_top"
> ftp://ftp.icce.rug.nl/pub/unix/</A
>) and updated for the Samba 2.0
release by Jeremy Allison. The conversion to DocBook for
Samba 2.2 was done by Gerald Carter</P
></DIV
></BODY
></HTML
>
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