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<refentry id='pam_sm_setcred'>
  <refmeta>
    <refentrytitle>pam_sm_setcred</refentrytitle>
    <manvolnum>3</manvolnum>
    <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo>
  </refmeta>

  <refnamediv id="pam_sm_setcred-name">
    <refname>pam_sm_setcred</refname>
    <refpurpose>PAM service function to alter credentials</refpurpose>
  </refnamediv>

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  <refsynopsisdiv>
    <funcsynopsis id='pam_sm_setcred-synopsis'>
      <funcsynopsisinfo>#define PAM_SM_AUTH</funcsynopsisinfo>
      <funcsynopsisinfo>#include &lt;security/pam_modules.h&gt;</funcsynopsisinfo>
      <funcprototype>
        <funcdef>PAM_EXTERN int <function>pam_sm_setcred</function></funcdef>
        <paramdef>pam_handle_t *<parameter>pamh</parameter></paramdef>
        <paramdef>int <parameter>flags</parameter></paramdef>
        <paramdef>int <parameter>argc</parameter></paramdef>
        <paramdef>const char **<parameter>argv</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>


  <refsect1 id='pam_sm_setcred-description'>
    <title>DESCRIPTION</title>
    <para>
      The <function>pam_sm_setcred</function> function is the service
      module's implementation of the
      <citerefentry>
        <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum>
      </citerefentry> interface.
    </para>
    <para>
      This function performs the task of altering the credentials of the
      user with respect to the corresponding authorization
      scheme. Generally, an authentication module may have access to more
      information about a user than their authentication token. This
      function is used to make such information available to the
      application. It should only be called <emphasis>after</emphasis> the
      user has been authenticated but before a session has been established.
    </para>
    <para>
       Valid flags, which may be logically OR'd with
       <emphasis>PAM_SILENT</emphasis>, are:
    </para>
    <variablelist>
      <varlistentry>
        <term>PAM_SILENT</term>
        <listitem>
           <para>
             Do not emit any messages.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>PAM_DELETE_CRED</term>
        <listitem>
          <para>
            Delete the credentials associated with the authentication service.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>PAM_REINITIALIZE_CRED</term>
        <listitem>
          <para>
            Reinitialize the user credentials.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>PAM_REFRESH_CRED</term>
        <listitem>
          <para>
            Extend the lifetime of the user credentials.
          </para>
        </listitem>
      </varlistentry>
    </variablelist>
    <para>
      The way the <emphasis remap='B'>auth</emphasis> stack is 
      navigated in order to evaluate the <function>pam_setcred</function>()
      function call, independent of the <function>pam_sm_setcred</function>() 
      return codes, is exactly the same way that it was navigated when
      evaluating the <function>pam_authenticate</function>() library
      call. Typically, if a stack entry was ignored in evaluating
      <function>pam_authenticate</function>(), it will be ignored when
      libpam evaluates the <function>pam_setcred</function>() function 
      call. Otherwise, the return codes from each module specific 
      <function>pam_sm_setcred</function>() call are treated as
      <emphasis remap='B'>required</emphasis>.
    </para>
  </refsect1>

  <refsect1 id="pam_sm_setcred-return_values">
    <title>RETURN VALUES</title>
    <variablelist>
      <varlistentry>
        <term>PAM_CRED_UNAVAIL</term>
        <listitem>
          <para>
            This module cannot retrieve the user's credentials.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>PAM_CRED_EXPIRED</term>
        <listitem>
          <para>
            The user's credentials have expired.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>PAM_CRED_ERR</term>
        <listitem>
          <para>
            This module was unable to set the credentials of the user.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>PAM_SUCCESS</term>
        <listitem>
           <para>
             The user credential was successfully set.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>PAM_USER_UNKNOWN</term>
        <listitem>
          <para>
            The user is not known to this authentication module.
          </para>
        </listitem>
      </varlistentry>
    </variablelist>
    <para>
      These, non-<emphasis>PAM_SUCCESS</emphasis>, return values will 
      typically lead to the credential stack <emphasis>failing</emphasis>.
      The first such error will dominate in the return value of 
      <function>pam_setcred</function>().
    </para>
  </refsect1>

  <refsect1 id='pam_sm_setcred-see_also'>
    <title>SEE ALSO</title>
    <para>
      <citerefentry>
        <refentrytitle>pam</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_sm_authenticate</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>
