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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="pwhistory_helper">

  <refmeta>
    <refentrytitle>pwhistory_helper</refentrytitle>
    <manvolnum>8</manvolnum>
    <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
  </refmeta>

  <refnamediv 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 id="pwhistory_helper-cmdsynopsis">
      <command>pwhistory_helper</command>
      <arg choice="opt">
        ...
      </arg>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1 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 id='pwhistory_helper-see_also'>
    <title>SEE ALSO</title>
    <para>
      <citerefentry>
	<refentrytitle>pam_pwhistory</refentrytitle><manvolnum>8</manvolnum>
      </citerefentry>
    </para>
  </refsect1>

  <refsect1 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>