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1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>smbpasswd</title><link rel="stylesheet" href="samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.68.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"><a name="smbpasswd.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>smbpasswd &#8212; change a user's SMB password</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">smbpasswd</code>  [-a] [-c &lt;config file&gt;] [-x] [-d] [-e] [-D debuglevel] [-n] [-r &lt;remote machine&gt;] [-R &lt;name resolve order&gt;] [-m] [-U username[%password]] [-h] [-s] [-w pass] [-W] [-i] [-L] [username]</p></div></div><div class="refsect1" lang="en"><a name="id231424"></a><h2>DESCRIPTION</h2><p>This tool is part of the <a href="samba.7.html"><span class="citerefentry"><span class="refentrytitle">samba</span>(7)</span></a> suite.</p><p>The smbpasswd program has several different
2        functions, depending on whether it is run by the <span class="emphasis"><em>root</em></span> user
3        or not. When run as a normal user it allows the user to change
4        the password used for their SMB sessions on any machines that store
5        SMB passwords. </p><p>By default (when run with no arguments) it will attempt to
6        change the current user's SMB password on the local machine. This is
7        similar to the way the <span><strong class="command">passwd(1)</strong></span> program works. <span><strong class="command">
8        smbpasswd</strong></span> differs from how the passwd program works
9        however in that it is not <span class="emphasis"><em>setuid root</em></span> but works in
10        a client-server mode and communicates with a
11        locally running <a href="smbd.8.html"><span class="citerefentry"><span class="refentrytitle">smbd</span>(8)</span></a>. As a consequence in order for this to
12        succeed the smbd daemon must be running on the local machine. On a
13        UNIX machine the encrypted SMB passwords are usually stored in
14        the <a href="smbpasswd.5.html"><span class="citerefentry"><span class="refentrytitle">smbpasswd</span>(5)</span></a> file. </p><p>When run by an ordinary user with no options, smbpasswd
15        will prompt them for their old SMB password and then ask them
16        for their new password twice, to ensure that the new password
17        was typed correctly. No passwords will be echoed on the screen
18        whilst being typed. If you have a blank SMB password (specified by
19        the string "NO PASSWORD" in the smbpasswd file) then just press
20        the &lt;Enter&gt; key when asked for your old password. </p><p>smbpasswd can also be used by a normal user to change their
21        SMB password on remote machines, such as Windows NT Primary Domain
22        Controllers.   See the (<em class="parameter"><code>-r</code></em>) and <em class="parameter"><code>-U</code></em> options
23        below. </p><p>When run by root, smbpasswd allows new users to be added
24        and deleted in the smbpasswd file, as well as allows changes to
25        the attributes of the user in this file to be made. When run by root, <span><strong class="command">
26        smbpasswd</strong></span> accesses the local smbpasswd file
27        directly, thus enabling changes to be made even if smbd is not
28        running. </p></div><div class="refsect1" lang="en"><a name="id231526"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">-a</span></dt><dd><p>
29                This option specifies that the username following should be added to the local smbpasswd file, with the new
30                password typed (type &lt;Enter&gt; for the old password). This option is ignored if the username following
31                already exists in the smbpasswd file and it is treated like a regular change password command.  Note that the
32                default passdb backends require the user to already exist in the system password file (usually
33                <code class="filename">/etc/passwd</code>), else the request to add the user will fail.
34                </p><p>This option is only available when running smbpasswd
35                as root. </p></dd><dt><span class="term">-c</span></dt><dd><p>
36                This option can be used to specify the path and file name of the <code class="filename">smb.conf</code> configuration file when it
37                is important to use other than the default file and / or location.
38                </p></dd><dt><span class="term">-x</span></dt><dd><p>
39                This option specifies that the username following should be deleted from the local smbpasswd file.
40                </p><p>
41                This option is only available when running smbpasswd as root.
42                </p></dd><dt><span class="term">-d</span></dt><dd><p>This option specifies that the username following
43                should be <code class="constant">disabled</code> in the local smbpasswd
44                file. This is done by writing a <code class="constant">'D'</code> flag
45                into the account control space in the smbpasswd file. Once this
46                is done all attempts to authenticate via SMB using this username
47                will fail. </p><p>If the smbpasswd file is in the 'old' format (pre-Samba 2.0
48                format) there is no space in the user's password entry to write
49                this information and the command will FAIL. See <a href="smbpasswd.5.html"><span class="citerefentry"><span class="refentrytitle">smbpasswd</span>(5)</span></a> for details on the 'old' and new password file formats.
50                </p><p>This option is only available when running smbpasswd as
51                root.</p></dd><dt><span class="term">-e</span></dt><dd><p>This option specifies that the username following
52                should be <code class="constant">enabled</code> in the local smbpasswd file,
53                if the account was previously disabled. If the account was not
54                disabled this option has no effect. Once the account is enabled then
55                the user will be able to authenticate via SMB once again. </p><p>If the smbpasswd file is in the 'old' format, then <span><strong class="command">
56                smbpasswd</strong></span> will FAIL to enable the account. 
57                See <a href="smbpasswd.5.html"><span class="citerefentry"><span class="refentrytitle">smbpasswd</span>(5)</span></a> for
58                details on the 'old' and new password file formats. </p><p>This option is only available when running smbpasswd as root.
59                </p></dd><dt><span class="term">-D debuglevel</span></dt><dd><p><em class="replaceable"><code>debuglevel</code></em> is an integer
60                from 0 to 10.  The default value if this parameter is not specified
61                is zero. </p><p>The higher this value, the more detail will be logged to the
62                log files about the activities of smbpasswd. At level 0, only
63                critical errors and serious warnings will be logged. </p><p>Levels above 1 will generate considerable amounts of log
64                data, and should only be used when investigating a problem. Levels
65                above 3 are designed for use only by developers and generate
66                HUGE amounts of log data, most of which is extremely cryptic.
67                </p></dd><dt><span class="term">-n</span></dt><dd><p>This option specifies that the username following
68                should have their password set to null (i.e. a blank password) in
69                the local smbpasswd file. This is done by writing the string "NO
70                PASSWORD" as the first part of the first password stored in the
71                smbpasswd file. </p><p>Note that to allow users to logon to a Samba server once
72                the password has been set to "NO PASSWORD" in the smbpasswd
73                file the administrator must set the following parameter in the [global]
74                section of the <code class="filename">smb.conf</code> file : </p><p><span><strong class="command">null passwords = yes</strong></span></p><p>This option is only available when running smbpasswd as
75                root.</p></dd><dt><span class="term">-r remote machine name</span></dt><dd><p>This option allows a user to specify what machine
76                they wish to change their password on. Without this parameter
77                smbpasswd defaults to the local host. The <em class="replaceable"><code>remote
78                machine name</code></em> is the NetBIOS name of the SMB/CIFS
79                server to contact to attempt the password change. This name is
80                resolved into an IP address using the standard name resolution
81                mechanism in all programs of the Samba suite. See the <em class="parameter"><code>-R
82                name resolve order</code></em> parameter for details on changing
83                this resolving mechanism. </p><p>The username whose password is changed is that of the
84                current UNIX logged on user. See the <em class="parameter"><code>-U username</code></em>
85                parameter for details on changing the password for a different
86                username. </p><p>Note that if changing a Windows NT Domain password the
87                remote machine specified must be the Primary Domain Controller for
88                the domain (Backup Domain Controllers only have a read-only
89                copy of the user account database and will not allow the password
90                change).</p><p><span class="emphasis"><em>Note</em></span> that Windows 95/98 do not have
91                a real password database so it is not possible to change passwords
92                specifying a Win95/98  machine as remote machine target. </p></dd><dt><span class="term">-R name resolve order</span></dt><dd><p>This option allows the user of smbpasswd to determine
93                what name resolution services to use when looking up the NetBIOS
94                name of the host being connected to. </p><p>The options are :"lmhosts", "host", "wins" and "bcast". They
95                 cause names to be resolved as follows: </p><div class="itemizedlist"><ul type="disc"><li><p><code class="constant">lmhosts</code>: Lookup an IP
96            address in the Samba lmhosts file. If the line in lmhosts has
97            no name type attached to the NetBIOS name (see the <a href="lmhosts.5.html"><span class="citerefentry"><span class="refentrytitle">lmhosts</span>(5)</span></a> for details) then
98            any name type matches for lookup.</p></li><li><p><code class="constant">host</code>: Do a standard host
99            name to IP address resolution, using the system <code class="filename">/etc/hosts
100            </code>, NIS, or DNS lookups. This method of name resolution
101            is operating system depended for instance on IRIX or Solaris this
102            may be controlled by the <code class="filename">/etc/nsswitch.conf</code> 
103            file).  Note that this method is only used if the NetBIOS name
104            type being queried is the 0x20 (server) name type, otherwise
105            it is ignored.</p></li><li><p><code class="constant">wins</code>: Query a name with
106            the IP address listed in the <em class="parameter"><code>wins server</code></em> 
107            parameter.  If no WINS server has been specified this method
108            will be ignored.</p></li><li><p><code class="constant">bcast</code>: Do a broadcast on
109            each of the known local interfaces listed in the
110            <em class="parameter"><code>interfaces</code></em> parameter. This is the least
111            reliable of the name resolution methods as it depends on the
112            target host being on a locally connected subnet.</p></li></ul></div><p>The default order is <span><strong class="command">lmhosts, host, wins, bcast</strong></span> 
113                and without this parameter or any entry in the <a href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> file the name resolution methods will
114                be attempted in this order. </p></dd><dt><span class="term">-m</span></dt><dd><p>This option tells smbpasswd that the account
115                being changed is a MACHINE account. Currently this is used
116                when Samba is being used as an NT Primary Domain Controller.</p><p>This option is only available when running smbpasswd as root.
117                </p></dd><dt><span class="term">-U username</span></dt><dd><p>This option may only be used in conjunction
118                with the <em class="parameter"><code>-r</code></em> option. When changing
119                a password on a remote machine it allows the user to specify
120                the user name on that machine whose password will be changed. It
121                is present to allow users who have different user names on
122                different systems to change these passwords. </p></dd><dt><span class="term">-h</span></dt><dd><p>This option prints the help string for <span><strong class="command">
123                smbpasswd</strong></span>, selecting the correct one for running as root
124                or as an ordinary user. </p></dd><dt><span class="term">-s</span></dt><dd><p>This option causes smbpasswd to be silent (i.e.
125                not issue prompts) and to read its old and new passwords from
126                standard  input, rather than from <code class="filename">/dev/tty</code> 
127                (like the <span><strong class="command">passwd(1)</strong></span> program does). This option
128                is to aid people writing scripts to drive smbpasswd</p></dd><dt><span class="term">-w password</span></dt><dd><p>This parameter is only available if Samba
129                has been compiled with LDAP support. The <em class="parameter"><code>-w</code></em> 
130                switch is used to specify the password to be used with the
131                <a class="indexterm" name="id272025"></a>ldap admin dn.  Note that the password is stored in
132                the <code class="filename">secrets.tdb</code> and is keyed off
133                of the admin's DN.  This means that if the value of <em class="parameter"><code>ldap
134                admin dn</code></em> ever changes, the password will need to be
135                manually updated as well.
136                </p></dd><dt><span class="term">-W</span></dt><dd><p><span><strong class="command">NOTE: </strong></span> This option is same as "-w"
137                except that the password should be entered using stdin.
138                </p><p>This parameter is only available if Samba
139                has been compiled with LDAP support. The <em class="parameter"><code>-W</code></em>
140                switch is used to specify the password to be used with the
141                <a class="indexterm" name="id272073"></a>ldap admin dn.  Note that the password is stored in
142                the <code class="filename">secrets.tdb</code> and is keyed off
143                of the admin's DN.  This means that if the value of <em class="parameter"><code>ldap
144                admin dn</code></em> ever changes, the password will need to be
145                manually updated as well.
146                </p></dd><dt><span class="term">-i</span></dt><dd><p>This option tells smbpasswd that the account
147                being changed is an interdomain trust account. Currently this is used
148                when Samba is being used as an NT Primary Domain Controller.
149                The account contains the info about another trusted domain.</p><p>This option is only available when running smbpasswd as root.
150                </p></dd><dt><span class="term">-L</span></dt><dd><p>Run in local mode.</p></dd><dt><span class="term">username</span></dt><dd><p>This specifies the username for all of the
151                <span class="emphasis"><em>root only</em></span> options to operate on. Only root
152                can specify this parameter as only root has the permission needed
153                to modify attributes directly in the local smbpasswd file.
154                </p></dd></dl></div></div><div class="refsect1" lang="en"><a name="id272143"></a><h2>NOTES</h2><p>Since <span><strong class="command">smbpasswd</strong></span> works in client-server
155        mode communicating  with a local smbd for a non-root user then
156        the smbd daemon must be running for this to work. A common problem
157        is to add a restriction to the hosts that may access the <span><strong class="command">
158        smbd</strong></span> running on the local machine by specifying either <em class="parameter"><code>allow
159        hosts</code></em> or <em class="parameter"><code>deny hosts</code></em> entry in
160        the <a href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> file and neglecting to
161        allow "localhost" access to the smbd. </p><p>In addition, the smbpasswd command is only useful if Samba
162        has been set up to use encrypted passwords. </p></div><div class="refsect1" lang="en"><a name="id272192"></a><h2>VERSION</h2><p>This man page is correct for version 3.0 of the Samba suite.</p></div><div class="refsect1" lang="en"><a name="id272203"></a><h2>SEE ALSO</h2><p><a href="smbpasswd.5.html"><span class="citerefentry"><span class="refentrytitle">smbpasswd</span>(5)</span></a>, <a href="Samba.7.html"><span class="citerefentry"><span class="refentrytitle">Samba</span>(7)</span></a>.</p></div><div class="refsect1" lang="en"><a name="id272227"></a><h2>AUTHOR</h2><p>The original Samba software and related utilities
163        were created by Andrew Tridgell. Samba is now developed
164        by the Samba Team as an Open Source project similar
165        to the way the Linux kernel is developed.</p><p>The original Samba man pages were written by Karl Auer.
166        The man page sources were converted to YODL format (another
167        excellent piece of Open Source software, available at <a href="" target="_top">
168</a>) and updated for the Samba 2.0
169        release by Jeremy Allison.  The conversion to DocBook for
170        Samba 2.2 was done by Gerald Carter. The conversion to DocBook XML 4.2
171        for Samba 3.0 was done by Alexander Bokovoy.</p></div></div></body></html>
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