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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
<refentry id="pam_userdb">
<refmeta>
<refentrytitle>pam_userdb</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
</refmeta>
<refnamediv id="pam_userdb-name">
<refname>pam_userdb</refname>
<refpurpose>PAM module to authenticate against a db database</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis id="pam_userdb-cmdsynopsis">
<command>pam_userdb.so</command>
<arg choice="plain">
db=<replaceable>/path/database</replaceable>
</arg>
<arg choice="opt">
debug
</arg>
<arg choice="opt">
crypt=[crypt|none]
</arg>
<arg choice="opt">
icase
</arg>
<arg choice="opt">
dump
</arg>
<arg choice="opt">
try_first_pass
</arg>
<arg choice="opt">
use_first_pass
</arg>
<arg choice="opt">
unknown_ok
</arg>
<arg choice="opt">
key_only
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="pam_userdb-description">
<title>DESCRIPTION</title>
<para>
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.
</para>
</refsect1>
<refsect1 id="pam_userdb-options">
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>
<option>crypt=[crypt|none]</option>
</term>
<listitem>
<para>
Indicates whether encrypted or plaintext passwords are stored
in the database. If it is <option>crypt</option>, passwords
should be stored in the database in
<citerefentry>
<refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum>
</citerefentry> form. If <option>none</option> is selected,
passwords should be stored in the database as plaintext.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>db=<replaceable>/path/database</replaceable></option>
</term>
<listitem>
<para>
Use the <filename>/path/database</filename> database for
performing lookup. There is no default; the module will
return <emphasis remap='B'>PAM_IGNORE</emphasis> if no
database is provided. Note that the path to the database file
should be specified without the <filename>.db</filename> suffix.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>debug</option>
</term>
<listitem>
<para>
Print debug information. Note that password hashes, both from db
and computed, will be printed to syslog.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>dump</option>
</term>
<listitem>
<para>
Dump all the entries in the database to the log.
Don't do this by default!
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>icase</option>
</term>
<listitem>
<para>
Make the password verification to be case insensitive
(ie when working with registration numbers and such).
Only works with plaintext password storage.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>try_first_pass</option>
</term>
<listitem>
<para>
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.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>use_first_pass</option>
</term>
<listitem>
<para>
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.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>unknown_ok</option>
</term>
<listitem>
<para>
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.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>key_only</option>
</term>
<listitem>
<para>
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.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="pam_userdb-types">
<title>MODULE TYPES PROVIDED</title>
<para>
The <option>auth</option> and <option>account</option> module
types are provided.
</para>
</refsect1>
<refsect1 id='pam_userdb-return_values'>
<title>RETURN VALUES</title>
<variablelist>
<varlistentry>
<term>PAM_AUTH_ERR</term>
<listitem>
<para>Authentication failure.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_AUTHTOK_RECOVERY_ERR</term>
<listitem>
<para>
Authentication information cannot be recovered.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_BUF_ERR</term>
<listitem>
<para>
Memory buffer error.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_CONV_ERR</term>
<listitem>
<para>
Conversation failure.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SERVICE_ERR</term>
<listitem>
<para>
Error in service module.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SUCCESS</term>
<listitem>
<para>
Success.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_USER_UNKNOWN</term>
<listitem>
<para>
User not known to the underlying authentication module.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='pam_userdb-examples'>
<title>EXAMPLES</title>
<programlisting>
auth sufficient pam_userdb.so icase db=/etc/dbtest
</programlisting>
</refsect1>
<refsect1 id='pam_userdb-see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>
</para>
</refsect1>
<refsect1 id='pam_userdb-author'>
<title>AUTHOR</title>
<para>
pam_userdb was written by Cristian Gafton >gafton@redhat.com<.
</para>
</refsect1>
</refentry>