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<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (c) 1989 - 1994, Julianne Frances Haugh
Copyright (c) 2007 - 2011, Nicolas François
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the copyright holders or contributors may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!-- SHADOW-CONFIG-HERE -->
]>
<refentry id='faillog.8'>
<!-- $Id$ -->
<refentryinfo>
<author>
<firstname>Julianne Frances</firstname>
<surname>Haugh</surname>
<contrib>Creation, 1989</contrib>
</author>
<author>
<firstname>Thomas</firstname>
<surname>Kłoczko</surname>
<email>kloczek@pld.org.pl</email>
<contrib>shadow-utils maintainer, 2000 - 2007</contrib>
</author>
<author>
<firstname>Nicolas</firstname>
<surname>François</surname>
<email>nicolas.francois@centraliens.net</email>
<contrib>shadow-utils maintainer, 2007 - now</contrib>
</author>
</refentryinfo>
<refmeta>
<refentrytitle>faillog</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">System Management Commands</refmiscinfo>
<refmiscinfo class="source">shadow-utils</refmiscinfo>
<refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>faillog</refname>
<refpurpose>display faillog records or set login failure limits</refpurpose>
</refnamediv>
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>faillog</command>
<arg choice='opt'>
<replaceable>options</replaceable>
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
<command>faillog</command> displays the contents of the failure log
database (<filename>/var/log/faillog</filename>). It can also
set the failure counters and limits. When
<command>faillog</command> is run without arguments, it only displays the
faillog records of the users who had a login failure.
</para>
</refsect1>
<refsect1 id='options'>
<title>OPTIONS</title>
<para>
The options which apply to the <command>faillog</command> command
are:
</para>
<variablelist remap='IP'>
<varlistentry>
<term><option>-a</option>, <option>--all</option></term>
<listitem>
<para>
Display (or act on) faillog records for all users having an
entry in the <filename>faillog</filename> database.
</para>
<para>
The range of users can be restricted with the
<option>-u</option> option.
</para>
<para>
In display mode, this is still restricted to existing users
but forces the display of the faillog entries even if they
are empty.
</para>
<para>
With the <option>-l</option>, <option>-m</option>,
<option>-r</option>, <option>-t</option> options, the users'
records are changed, even if the user does not exist on the
system. This is useful to reset records of users that have
been deleted or to set a policy in advance for a range of
users.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-h</option>, <option>--help</option></term>
<listitem>
<para>Display help message and exit.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-l</option>, <option>--lock-secs</option> <replaceable>SEC</replaceable>
</term>
<listitem>
<para>
Lock account for <replaceable>SEC</replaceable>
seconds after failed login.
</para>
<para>
Write access to <filename>/var/log/faillog</filename>
is required for this option.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-m</option>, <option>--maximum</option> <replaceable>MAX</replaceable>
</term>
<listitem>
<para>
Set the maximum number of login failures after the account is
disabled to <replaceable>MAX</replaceable>.
</para>
<para>
Selecting a
<replaceable>MAX</replaceable> value of 0 has the effect of not
placing a limit on the number of failed logins.
</para>
<para>
The maximum
failure count should always be 0 for <emphasis>root</emphasis>
to prevent a denial of services attack against the system.
</para>
<para>
Write access to <filename>/var/log/faillog</filename>
is required for this option.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-r</option>, <option>--reset</option></term>
<listitem>
<para>
Reset the counters of login failures.
</para>
<para>
Write access to <filename>/var/log/faillog</filename>
is required for this option.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-R</option>, <option>--root</option> <replaceable>CHROOT_DIR</replaceable>
</term>
<listitem>
<para>
Apply changes in the <replaceable>CHROOT_DIR</replaceable>
directory and use the configuration files from the
<replaceable>CHROOT_DIR</replaceable> directory.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-t</option>, <option>--time</option> <replaceable>DAYS</replaceable>
</term>
<listitem>
<para>
Display faillog records more recent than
<replaceable>DAYS</replaceable>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-u</option>, <option>--user</option> <replaceable>LOGIN</replaceable>|<replaceable>RANGE</replaceable>
</term>
<listitem>
<para>
Display faillog record or maintains failure counters and limits
(if used with <option>-l</option>, <option>-m</option> or
<option>-r</option> options) only for the specified user(s).
</para>
<para>
The users can be specified by a login name, a numerical user
ID, or a <replaceable>RANGE</replaceable> of users. This
<replaceable>RANGE</replaceable> of users can be specified
with a min and max values
(<replaceable>UID_MIN-UID_MAX</replaceable>), a max value
(<replaceable>-UID_MAX</replaceable>), or a min value
(<replaceable>UID_MIN-</replaceable>).
</para>
</listitem>
</varlistentry>
</variablelist>
<para>
When none of the <option>-l</option>, <option>-m</option>, or
<option>-r</option> options are used, <command>faillog</command>
displays the faillog record of the specified user(s).
</para>
</refsect1>
<refsect1 id='caveats'>
<title>CAVEATS</title>
<para>
<command>faillog</command> only prints out users with no successful
login since the last failure. To print out a user who has had a
successful login since their last failure, you must explicitly request
the user with the <option>-u</option> flag, or print out all users
with the <option>-a</option> flag.
</para>
</refsect1>
<refsect1 id='files'>
<title>FILES</title>
<variablelist>
<varlistentry>
<term><filename>/var/log/faillog</filename></term>
<listitem>
<para>Failure logging file.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>login</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>faillog</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>.
</para>
</refsect1>
</refentry>
|
