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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
+<refentry id='pam_chauthtok'>
+ <refmeta>
+ <refentrytitle>pam_chauthtok</refentrytitle>
+ <manvolnum>3</manvolnum>
+ <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_chauthtok-name">
+ <refname>pam_chauthtok</refname>
+ <refpurpose>updating authentication tokens</refpurpose>
+ </refnamediv>
+
+<!-- body begins here -->
+
+ <refsynopsisdiv id='pam_chauthtok-synopsis'>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;security/pam_appl.h&gt;</funcsynopsisinfo>
+ <funcprototype>
+ <funcdef>int <function>pam_chauthtok</function></funcdef>
+ <paramdef>pam_handle_t *<parameter>pamh</parameter></paramdef>
+ <paramdef>int <parameter>flags</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+
+ <refsect1 id='pam_chauthtok-description'>
+ <title>DESCRIPTION</title>
+ <para>
+ The <function>pam_chauthtok</function> function is used to change the
+ authentication token for a given user (as indicated by the state
+ associated with the handle <emphasis>pamh</emphasis>.
+ </para>
+ <para>
+ The <emphasis>pamh</emphasis> argument is an authentication
+ handle obtained by a prior call to pam_start().
+ The flags argument is the binary or of zero or more of the
+ following values:
+ </para>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_SILENT</term>
+ <listitem>
+ <para>
+ Do not emit any messages.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_CHANGE_EXPIRED_AUTHTOK</term>
+ <listitem>
+ <para>
+ This argument indicates to the modules that the users
+ authentication token (password) should only be changed
+ if it has expired.
+ If this argument is not passed, the application requires
+ that all authentication tokens are to be changed.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="pam_start-return_values">
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_AUTHTOK_ERR</term>
+ <listitem>
+ <para>
+ A module was unable to obtain the new authentication token.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_AUTHTOK_RECOVERY_ERR</term>
+ <listitem>
+ <para>
+ A module was unable to obtain the old authentication token.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_AUTHTOK_LOCK_BUSY</term>
+ <listitem>
+ <para>
+ One or more of the modules was unable to change the
+ authentication token since it is currently locked.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_AUTHTOK_DISABLE_AGING</term>
+ <listitem>
+ <para>
+ Authentication token aging has been disabled for at least
+ one of the modules.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_PERM_DENIED</term>
+ <listitem>
+ <para>
+ Permission denied.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ The authentication token was successfully updated.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_TRY_AGAIN</term>
+ <listitem>
+ <para>
+ Not all of the modules were in a position to update the
+ authentication token(s). In such a case none of the user's
+ authentication tokens are updated.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_USER_UNKNOWN</term>
+ <listitem>
+ <para>
+ User unknown to password service.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_chauthtok-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>pam_start</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam_authenticate</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam_get_item</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam_strerror</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>
+ </para>
+ </refsect1>
+</refentry>