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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>6.38. pam_userdb - authenticate against a db database</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="Linux-PAM_SAG.html" title="The Linux-PAM System Administrators' Guide"><link rel="up" href="sag-module-reference.html" title="Chapter 6. A reference guide for available modules"><link rel="prev" href="sag-pam_unix.html" title="6.37. pam_unix - traditional password authentication"><link rel="next" href="sag-pam_warn.html" title="6.39. pam_warn - logs all PAM items"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">6.38. pam_userdb - authenticate against a db database</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sag-pam_unix.html">Prev</a> </td><th width="60%" align="center">Chapter 6. A reference guide for available modules</th><td width="20%" align="right"> <a accesskey="n" href="sag-pam_warn.html">Next</a></td></tr></table><hr></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sag-pam_userdb"></a>6.38. pam_userdb - authenticate against a db database</h2></div></div></div><div class="cmdsynopsis"><p><code class="command">pam_userdb.so</code>
db=<em class="replaceable"><code>/path/database</code></em>
[
debug
] [
crypt=[crypt|none]
] [
icase
] [
dump
] [
try_first_pass
] [
use_first_pass
] [
unknown_ok
] [
key_only
]</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-description"></a>6.38.1. DESCRIPTION</h3></div></div></div><p>
The pam_userdb module is used to verify a username/password pair
against values stored in a Berkeley DB database. The database is
indexed by the username, and the data fields corresponding to the
username keys are the passwords.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-options"></a>6.38.2. OPTIONS</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">
<code class="option">crypt=[crypt|none]</code>
</span></dt><dd><p>
Indicates whether encrypted or plaintext passwords are stored
in the database. If it is <code class="option">crypt</code>, passwords
should be stored in the database in
<span class="citerefentry"><span class="refentrytitle">crypt</span>(3)</span> form. If <code class="option">none</code> is selected,
passwords should be stored in the database as plaintext.
</p></dd><dt><span class="term">
<code class="option">db=<em class="replaceable"><code>/path/database</code></em></code>
</span></dt><dd><p>
Use the <code class="filename">/path/database</code> database for
performing lookup. There is no default; the module will
return <span class="emphasis"><em>PAM_IGNORE</em></span> if no
database is provided. Note that the path to the database file
should be specified without the <code class="filename">.db</code> suffix.
</p></dd><dt><span class="term">
<code class="option">debug</code>
</span></dt><dd><p>
Print debug information. Note that password hashes, both from db
and computed, will be printed to syslog.
</p></dd><dt><span class="term">
<code class="option">dump</code>
</span></dt><dd><p>
Dump all the entries in the database to the log.
Don't do this by default!
</p></dd><dt><span class="term">
<code class="option">icase</code>
</span></dt><dd><p>
Make the password verification to be case insensitive
(ie when working with registration numbers and such).
Only works with plaintext password storage.
</p></dd><dt><span class="term">
<code class="option">try_first_pass</code>
</span></dt><dd><p>
Use the authentication token previously obtained by
another module that did the conversation with the
application. If this token can not be obtained then
the module will try to converse. This option can
be used for stacking different modules that need to
deal with the authentication tokens.
</p></dd><dt><span class="term">
<code class="option">use_first_pass</code>
</span></dt><dd><p>
Use the authentication token previously obtained by
another module that did the conversation with the
application. If this token can not be obtained then
the module will fail. This option can be used for
stacking different modules that need to deal with
the authentication tokens.
</p></dd><dt><span class="term">
<code class="option">unknown_ok</code>
</span></dt><dd><p>
Do not return error when checking for a user that is
not in the database. This can be used to stack more
than one pam_userdb module that will check a
username/password pair in more than a database.
</p></dd><dt><span class="term">
<code class="option">key_only</code>
</span></dt><dd><p>
The username and password are concatenated together
in the database hash as 'username-password' with a
random value. if the concatenation of the username and
password with a dash in the middle returns any result,
the user is valid. this is useful in cases where
the username may not be unique but the username and
password pair are.
</p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-types"></a>6.38.3. MODULE TYPES PROVIDED</h3></div></div></div><p>
The <code class="option">auth</code> and <code class="option">account</code> module
types are provided.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-return_values"></a>6.38.4. RETURN VALUES</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">PAM_AUTH_ERR</span></dt><dd><p>Authentication failure.</p></dd><dt><span class="term">PAM_AUTHTOK_RECOVERY_ERR</span></dt><dd><p>
Authentication information cannot be recovered.
</p></dd><dt><span class="term">PAM_BUF_ERR</span></dt><dd><p>
Memory buffer error.
</p></dd><dt><span class="term">PAM_CONV_ERR</span></dt><dd><p>
Conversation failure.
</p></dd><dt><span class="term">PAM_SERVICE_ERR</span></dt><dd><p>
Error in service module.
</p></dd><dt><span class="term">PAM_SUCCESS</span></dt><dd><p>
Success.
</p></dd><dt><span class="term">PAM_USER_UNKNOWN</span></dt><dd><p>
User not known to the underlying authentication module.
</p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-examples"></a>6.38.5. EXAMPLES</h3></div></div></div><pre class="programlisting">
auth sufficient pam_userdb.so icase db=/etc/dbtest
</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-author"></a>6.38.6. AUTHOR</h3></div></div></div><p>
pam_userdb was written by Cristian Gafton >gafton@redhat.com<.
</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sag-pam_unix.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sag-module-reference.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sag-pam_warn.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.37. pam_unix - traditional password authentication </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_SAG.html">Home</a></td><td width="40%" align="right" valign="top"> 6.39. pam_warn - logs all PAM items</td></tr></table></div></body></html>