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<title>htdbm - Manipulate DBM password databases - Apache HTTP Server Version 2.5</title>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Programs</a></div><div id="page-content"><div id="preamble"><h1>htdbm - Manipulate DBM password databases</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/programs/htdbm.html" title="English"> en </a> |
<a href="../fr/programs/htdbm.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
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<p><code>htdbm</code> is used to manipulate the DBM format files used to
store usernames and password for basic authentication of HTTP users via
<code class="module"><a href="../mod/mod_authn_dbm.html">mod_authn_dbm</a></code>. See the <code class="program"><a href="../programs/dbmmanage.html">dbmmanage</a></code>
documentation for more information about these DBM files.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#synopsis">Synopsis</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#options">Options</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#bugs">Bugs</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#exit">Exit Status</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#security">Security Considerations</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#restrictions">Restrictions</a></li>
</ul><h3>See also</h3><ul class="seealso"><li><code class="program"><a href="../programs/httpd.html">httpd</a></code></li><li><code class="program"><a href="../programs/dbmmanage.html">dbmmanage</a></code></li><li><code class="module"><a href="../mod/mod_authn_dbm.html">mod_authn_dbm</a></code></li><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="synopsis" id="synopsis">Synopsis</a> <a title="Permanent link" href="#synopsis" class="permalink">¶</a></h2>
<p><code><strong>htdbm</strong>
[ -<strong>T</strong><var>DBTYPE</var> ]
[ -<strong>i</strong> ]
[ -<strong>c</strong> ]
[ -<strong>m</strong> |
-<strong>B</strong> |
-<strong>d</strong> |
-<strong>s</strong> |
-<strong>p</strong> ]
[ -<strong>C</strong> <var>cost</var> ]
[ -<strong>t</strong> ]
[ -<strong>v</strong> ]
<var>filename</var> <var>username</var></code></p>
<p><code><strong>htdbm</strong> -<strong>b</strong>
[ -<strong>T</strong><var>DBTYPE</var> ]
[ -<strong>c</strong> ]
[ -<strong>m</strong> |
-<strong>B</strong> |
-<strong>d</strong> |
-<strong>s</strong> |
-<strong>p</strong> ]
[ -<strong>C</strong> <var>cost</var> ]
[ -<strong>t</strong> ]
[ -<strong>v</strong> ]
<var>filename</var> <var>username</var> <var>password</var></code></p>
<p><code><strong>htdbm</strong> -<strong>n</strong>
[ -<strong>i</strong> ]
[ -<strong>c</strong> ]
[ -<strong>m</strong> |
-<strong>B</strong> |
-<strong>d</strong> |
-<strong>s</strong> |
-<strong>p</strong> ]
[ -<strong>C</strong> <var>cost</var> ]
[ -<strong>t</strong> ]
[ -<strong>v</strong> ]
<var>username</var></code></p>
<p><code><strong>htdbm</strong> -<strong>nb</strong>
[ -<strong>c</strong> ]
[ -<strong>m</strong> |
-<strong>B</strong> |
-<strong>d</strong> |
-<strong>s</strong> |
-<strong>p</strong> ]
[ -<strong>C</strong> <var>cost</var> ]
[ -<strong>t</strong> ]
[ -<strong>v</strong> ]
<var>username</var> <var>password</var></code></p>
<p><code><strong>htdbm</strong> -<strong>v</strong>
[ -<strong>T</strong><var>DBTYPE</var> ]
[ -<strong>i</strong> ]
[ -<strong>c</strong> ]
[ -<strong>m</strong> |
-<strong>B</strong> |
-<strong>d</strong> |
-<strong>s</strong> |
-<strong>p</strong> ]
[ -<strong>C</strong> <var>cost</var> ]
[ -<strong>t</strong> ]
[ -<strong>v</strong> ]
<var>filename</var> <var>username</var></code></p>
<p><code><strong>htdbm</strong> -<strong>vb</strong>
[ -<strong>T</strong><var>DBTYPE</var> ]
[ -<strong>c</strong> ]
[ -<strong>m</strong> |
-<strong>B</strong> |
-<strong>d</strong> |
-<strong>s</strong> |
-<strong>p</strong> ]
[ -<strong>C</strong> <var>cost</var> ]
[ -<strong>t</strong> ]
[ -<strong>v</strong> ]
<var>filename</var> <var>username</var> <var>password</var></code></p>
<p><code><strong>htdbm</strong> -<strong>x</strong>
[ -<strong>T</strong><var>DBTYPE</var> ]
<var>filename</var> <var>username</var></code></p>
<p><code><strong>htdbm</strong> -<strong>l</strong>
[ -<strong>T</strong><var>DBTYPE</var> ]
<var>filename</var></code></p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="options" id="options">Options</a> <a title="Permanent link" href="#options" class="permalink">¶</a></h2>
<dl>
<dt><code>-b</code></dt>
<dd>Use batch mode; <em>i.e.</em>, get the password from the command line
rather than prompting for it. This option should be used with extreme care,
since <strong>the password is clearly visible</strong> on the command
line. For script use see the <code>-i</code> option.</dd>
<dt><code>-i</code></dt>
<dd>Read the password from stdin without verification (for script usage).</dd>
<dt><code>-c</code></dt>
<dd>Create the <var>passwdfile</var>. If <var>passwdfile</var> already
exists, it is rewritten and truncated. This option cannot be combined with
the <code>-n</code> option.</dd>
<dt><code>-n</code></dt>
<dd>Display the results on standard output rather than updating a
database. This option changes the syntax of the command line, since the
<var>passwdfile</var> argument (usually the first one) is omitted. It
cannot be combined with the <code>-c</code> option.</dd>
<dt><code>-m</code></dt>
<dd>Use MD5 encryption for passwords. On Windows and Netware, this is
the default.</dd>
<dt><code>-B</code></dt>
<dd>Use bcrypt encryption for passwords. This is currently considered to
be very secure.</dd>
<dt><code>-C</code></dt>
<dd>This flag is only allowed in combination with <code>-B</code> (bcrypt
encryption). It sets the computing time used for the bcrypt algorithm
(higher is more secure but slower, default: 5, valid: 4 to 31).</dd>
<dt><code>-d</code></dt>
<dd>Use <code>crypt()</code> encryption for passwords. The default on all
platforms but Windows and Netware. Though possibly supported by
<code>htdbm</code> on all platforms, it is not supported by the
<code class="program"><a href="../programs/httpd.html">httpd</a></code> server on Windows and Netware.
This algorithm is <strong>insecure</strong> by today's standards.</dd>
<dt><code>-s</code></dt>
<dd>Use SHA encryption for passwords. Facilitates migration from/to Netscape
servers using the LDAP Directory Interchange Format (ldif).
This algorithm is <strong>insecure</strong> by today's standards.</dd>
<dt><code>-p</code></dt>
<dd>Use plaintext passwords. Though <code>htdbm</code> will support
creation on all platforms, the <code class="program"><a href="../programs/httpd.html">httpd</a></code> daemon will
only accept plain text passwords on Windows and Netware.</dd>
<dt><code>-l</code></dt>
<dd>Print each of the usernames and comments from the database on
stdout.</dd>
<dt><code>-v</code></dt>
<dd>Verify the username and password. The program will print a message
indicating whether the supplied password is valid. If the password is
invalid, the program exits with error code 3.</dd>
<dt><code>-x</code></dt>
<dd>Delete user. If the username exists in the specified DBM file, it
will be deleted.</dd>
<dt><code>-t</code></dt>
<dd>Interpret the final parameter as a comment. When this option is
specified, an additional string can be appended to the command line; this
string will be stored in the "Comment" field of the database, associated
with the specified username.</dd>
<dt><code><var>filename</var></code></dt>
<dd>The filename of the DBM format file. Usually without the extension
<code>.db</code>, <code>.pag</code>, or <code>.dir</code>. If
<code>-c</code> is given, the DBM file is created if it does not already
exist, or updated if it does exist.</dd>
<dt><code><var>username</var></code></dt>
<dd>The username to create or update in <var>passwdfile</var>. If
<var>username</var> does not exist in this file, an entry is added. If it
does exist, the password is changed.</dd>
<dt><code><var>password</var></code></dt>
<dd>The plaintext password to be encrypted and stored in the DBM file.
Used only with the <code>-b</code> flag.</dd>
<dt><code>-T<var>DBTYPE</var></code></dt>
<dd>Type of DBM file (SDBM, GDBM, DB, or "default").</dd>
</dl>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="bugs" id="bugs">Bugs</a> <a title="Permanent link" href="#bugs" class="permalink">¶</a></h2>
<p>One should be aware that there are a number of different DBM file
formats in existence, and with all likelihood, libraries for more than
one format may exist on your system. The three primary examples are
SDBM, NDBM, GNU GDBM, and Berkeley/Sleepycat DB 2/3/4. Unfortunately,
all these libraries use different file formats, and you must make sure
that the file format used by <var>filename</var> is the same format that
<code>htdbm</code> expects to see. <code>htdbm</code> currently has
no way of determining what type of DBM file it is looking at. If used
against the wrong format, will simply return nothing, or may create a
different DBM file with a different name, or at worst, it may corrupt
the DBM file if you were attempting to write to it.</p>
<p>One can usually use the <code>file</code> program supplied with most
Unix systems to see what format a DBM file is in.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="exit" id="exit">Exit Status</a> <a title="Permanent link" href="#exit" class="permalink">¶</a></h2>
<p><code>htdbm</code> returns a zero status ("true") if the username and
password have been successfully added or updated in the DBM File.
<code>htdbm</code> returns <code>1</code> if it encounters some problem
accessing files, <code>2</code> if there was a syntax problem with the
command line, <code>3</code> if the password was entered interactively and
the verification entry didn't match, <code>4</code> if its operation was
interrupted, <code>5</code> if a value is too long (username, filename,
password, or final computed record), <code>6</code> if the username
contains illegal characters (see the <a href="#restrictions">Restrictions
section</a>), and <code>7</code> if the file is not a valid DBM password
file.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="examples" id="examples">Examples</a> <a title="Permanent link" href="#examples" class="permalink">¶</a></h2>
<div class="example"><p><code>
htdbm /usr/local/etc/apache/.htdbm-users jsmith
</code></p></div>
<p>Adds or modifies the password for user <code>jsmith</code>. The user
is prompted for the password. If executed on a Windows system, the password
will be encrypted using the modified Apache MD5 algorithm; otherwise, the
system's <code>crypt()</code> routine will be used. If the file does not
exist, <code>htdbm</code> will do nothing except return an error.</p>
<div class="example"><p><code>
htdbm -c /home/doe/public_html/.htdbm jane
</code></p></div>
<p>Creates a new file and stores a record in it for user <code>jane</code>.
The user is prompted for the password. If the file exists and cannot be
read, or cannot be written, it is not altered and <code>htdbm</code>
will display a message and return an error status.</p>
<div class="example"><p><code>
htdbm -mb /usr/web/.htdbm-all jones Pwd4Steve
</code></p></div>
<p>Encrypts the password from the command line (<code>Pwd4Steve</code>)
using the MD5 algorithm, and stores it in the specified file.</p>
<p>To convert an existing text file <code>htpasswd</code>-generated
password file to a <code>dbm</code> file, use <code>awk</code> to
feed each line of that file into <code>htdbm</code>:</p>
<div class="example"><p><code>
htdbm -cbp passwords.dbm bogus bogus
awk 'BEGIN { FS=":" }; {system ("htdbm -bp passwords.dbm " $1 " " $2)}' passwords
htdbm -x bogus
</code></p></div>
<p>The first line creates a new password database with a temporary
placeholder entry, and the third line removes that placeholder.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="security" id="security">Security Considerations</a> <a title="Permanent link" href="#security" class="permalink">¶</a></h2>
<p>Web password files such as those managed by <code>htdbm</code> should
<em>not</em> be within the Web server's URI space -- that is, they should
not be fetchable with a browser.</p>
<p>The use of the <code>-b</code> option is discouraged, since when it is
used the unencrypted password appears on the command line.</p>
<p>When using the <code>crypt()</code> algorithm, note that only the first
8 characters of the password are used to form the password. If the supplied
password is longer, the extra characters will be silently discarded.</p>
<p>The SHA encryption format does not use salting: for a given password,
there is only one encrypted representation. The <code>crypt()</code> and
MD5 formats permute the representation by prepending a random salt string,
to make dictionary attacks against the passwords more difficult.</p>
<p>The SHA and <code>crypt()</code> formats are insecure by today's
standards.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="restrictions" id="restrictions">Restrictions</a> <a title="Permanent link" href="#restrictions" class="permalink">¶</a></h2>
<p>On the Windows platform, passwords encrypted with
<code>htdbm</code> are limited to no more than <code>255</code>
characters in length. Longer passwords will be truncated to 255
characters.</p>
<p>The MD5 algorithm used by <code>htdbm</code> is specific to the Apache
software; passwords encrypted using it will not be usable with other Web
servers.</p>
<p>Usernames are limited to <code>255</code> bytes and may not include the
character <code>:</code>.</p>
</div></div>
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