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SMBD(8)

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Table of Contents

   * NAME
   * SYNOPSIS
   * DESCRIPTION
   * OPTIONS
   * FILES
   * LIMITATIONS
   * ENVIRONMENT VARIABLES
   * INSTALLATION
   * RUNNING THE SERVER AS A DAEMON
   * RUNNING THE SERVER ON REQUEST
   * TESTING THE INSTALLATION
   * VERSION
   * SEE ALSO
   * DIAGNOSTICS
   * BUGS
   * CREDITS

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NAME

smbd - provide SMB (aka LanManager) services to clients

SYNOPSIS

smbd [ -D ] [ -a ] [ -d debuglevel ] [ -l log file ] [ -p port number ] [
-O socket options ] [ -s configuration file ]

DESCRIPTION

This program is part of the Samba suite.

smbd is a server that can provide most SMB services. The server provides
filespace and printer services to clients using the SMB protocol. This is
compatible with the LanManager protocol, and can service LanManager
clients.

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 smb.conf(5)). This man page will not describe the
services, but will concentrate on the administrative aspects of running the
server.

Please note that there are significant security implications to running
this server, and smb.conf(5) should be regarded as mandatory reading before
proceeding with installation.

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 are closed, the copy of the server for that client
terminates.

The configuration file is automatically reloaded if it changes. You can
force a reload by sending a SIGHUP to the server.

OPTIONS

-D

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.

By default, the server will NOT operate as a daemon.

-a

If this parameter is specified, the log files will be overwritten with each
new connection. By default, the log files will be appended to.

-d debuglevel

debuglevel is an integer from 0 to 5.

The default value if this parameter is not specified is zero.

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.

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.

-l log file

If specified, logfile specifies a base filename into which operational data
from the running server will be logged.

The default base name is specified at compile time.

The base name is used to generate actual log file names. For example, if
the name specified was "log", the following files would be used for log
data:

log.debug (containing debugging information)

log.in (containing inbound transaction data)

log.out (containing outbound transaction data)

The log files generated are never removed by the server.

-O socket options

See the socket options section of smb.conf(5) for details

-p port number

port number is a positive integer value.

The default value if this parameter is not specified is 139.

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 server 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.

This parameter is not normally specified except in the above situation.

-s configuration file

The default configuration file name is determined at compile time.

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 smb.conf(5) for more
information.

FILES

/etc/inetd.conf

If the server is to be run by the inetd meta-daemon, this file must contain
suitable startup information for the meta-daemon. See the section
"INSTALLATION" below.

/etc/rc

(or whatever initialisation script your system uses)

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.

/etc/services

If running the server via the meta-daemon inetd, this file must contain a
mapping of service name (eg., netbios-ssn) to service port (eg., 139) and
protocol type (eg., tcp). See the section "INSTALLATION" below.

/usr/local/samba/lib/smb.conf

This file describes all the services the server is to make available to
clients. See smb.conf(5) for more information.

LIMITATIONS

On some systems smbd 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.

ENVIRONMENT VARIABLES

PRINTER

If no printer name is specified to printable services, most systems will
use the value of this variable (or "lp" if this variable is not defined) as
the name of the printer to use. This is not specific to the server,
however.

INSTALLATION

The location of the server and its support files is a matter for individual
system administrators. The following are thus suggestions only.

It is recommended that the server software be installed under the
/usr/local/samba 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 smbd 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 smbd 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 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.

The server log files should be put in a directory readable and writable
only by root, as the log files may contain sensitive information.

The configuration file should be placed in a directory readable and
writable 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
"smb.conf.sample" is supplied with the source to the server - this may be
renamed to "smb.conf" and modified to suit your needs.

The remaining notes will assume the following:

smbd (the server program) installed in /usr/local/samba/bin

smb.conf (the configuration file) installed in /usr/local/samba/lib

log files stored in /var/adm/smblogs

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 inetd 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.

When you've decided, continue with either "RUNNING THE SERVER AS A DAEMON"
or "RUNNING THE SERVER ON REQUEST".

RUNNING THE SERVER AS A DAEMON

To run the server as a daemon from the command line, simply put the -D
option on the command line. There is no need to place an ampersand at the
end of the command line - the -D option causes the server to detach itself
from the tty anyway.

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.

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 /etc/rc), insert the following line,
substituting port number, log file location, configuration file location
and debug level as desired:

/usr/local/samba/bin/smbd -D -l /var/adm/smblogs/log -s
/usr/local/samba/lib/smb.conf

(The above should appear in your initialisation 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.)

If the options used at compile time are appropriate for your system, all
parameters except the desired debug level and -D may be omitted. See the
section "OPTIONS" above.

RUNNING THE SERVER ON REQUEST

If your system uses a meta-daemon such as inetd, you can arrange to have
the smbd 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.

You will probably want to set up the name server nmbd at the same time as
smbd - refer to the man page nmbd(8).

First, ensure that a port is configured in the file /etc/services. The
well-known port 139 should be used if possible, though any port may be
used.

Ensure that a line similar to the following is in /etc/services:

netbios-ssn 139/tcp

Note for NIS/YP users - you may need to rebuild the NIS service maps rather
than alter your local /etc/services file.

Next, put a suitable line in the file /etc/inetd.conf (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
/etc/services. Substitute appropriate values for your system in this line
(see inetd(8)):

netbios-ssn stream tcp nowait root /usr/local/samba/bin/smbd -d1
-l/var/adm/smblogs/log -s/usr/local/samba/lib/smb.conf

(The above should appear in /etc/inetd.conf 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.)

Note that there is no need to specify a port number here, even if you are
using a non-standard port number.

Lastly, edit the configuration file to provide suitable services. To start
with, the following two services should be all you need:

[homes]

 writable = yes

[printers]

 writable = no
 printable = yes
 path = /tmp
 public = yes

This will allow you to connect to your home directory and print to any
printer supported by the host (user privileges permitting).

TESTING THE INSTALLATION

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 inetd will reread their configuration tables if they
receive a HUP signal.

If your machine's name is "fred" and your name is "mary", you should now be
able to connect to the service "\\fred\mary".

To properly test and experiment with the server, we recommend using the
smbclient program (see smbclient(1)).

VERSION

This man page is (mostly) correct for version 1.9.00 of the Samba suite,
plus some of the recent patches to it. These notes will necessarily lag
behind development of the software, so it is possible that your version of
the server has extensions or parameter semantics that differ from or are
not covered by this man page. Please notify these to the address below for
rectification.

SEE ALSO

hosts_access(5), inetd(8), nmbd(8), smb.conf(5), smbclient(1), testparm(1),
testprns(1)

DIAGNOSTICS

[This section under construction]

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.

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.

Most messages are reasonably self-explanatory. Unfortunately, at time of
creation of this man page the source code is still too fluid 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.

BUGS

None known.

CREDITS

The original Samba software and related utilities were created by Andrew
Tridgell (samba-bugs@samba.anu.edu.au). Andrew is also the Keeper of the
Source for this project.

See smb.conf(5) for a full list of contributors and details on how to
submit bug reports, comments etc.
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