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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="pwhistory_helper">
<refmeta>
<refentrytitle>pwhistory_helper</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="source">Linux-PAM</refmiscinfo>
<refmiscinfo class="manual">Linux-PAM Manual</refmiscinfo>
</refmeta>
<refnamediv xml:id="pwhistory_helper-name">
<refname>pwhistory_helper</refname>
<refpurpose>Helper binary that transfers password hashes from passwd or shadow to opasswd</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis xml:id="pwhistory_helper-cmdsynopsis" sepchar=" ">
<command>pwhistory_helper</command>
<arg choice="opt" rep="norepeat">
...
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="pwhistory_helper-description">
<title>DESCRIPTION</title>
<para>
<emphasis>pwhistory_helper</emphasis> is a helper program for the
<emphasis>pam_pwhistory</emphasis> module that transfers password hashes
from passwd or shadow file to the opasswd file and checks a password
supplied by user against the existing hashes in the opasswd file.
</para>
<para>
The purpose of the helper is to enable tighter confinement of
login and password changing services. The helper is thus called only
when SELinux is enabled on the system.
</para>
<para>
The interface of the helper - command line options, and input/output
data format are internal to the <emphasis>pam_pwhistory</emphasis>
module and it should not be called directly from applications.
</para>
</refsect1>
<refsect1 xml:id="pwhistory_helper-see_also">
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>pam_pwhistory</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>
</para>
</refsect1>
<refsect1 xml:id="pwhistory_helper-author">
<title>AUTHOR</title>
<para>
Written by Tomas Mraz based on the code originally in
<emphasis>pam_pwhistory and pam_unix</emphasis> modules.
</para>
</refsect1>
</refentry>
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