/*	$NetBSD: openpam_nullconv.c,v 1.3 2017/05/06 19:50:09 christos Exp $	*/

/*-
 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
 * Copyright (c) 2004-2011 Dag-Erling Smørgrav
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project by ThinkSec AS and
 * Network Associates Laboratories, the Security Research Division of
 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
 * ("CBOSS"), as part of the DARPA CHATS research program.
 *
 * 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 author may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $OpenPAM: openpam_nullconv.c 938 2017-04-30 21:34:42Z des $
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <sys/cdefs.h>
__RCSID("$NetBSD: openpam_nullconv.c,v 1.3 2017/05/06 19:50:09 christos Exp $");

#include <sys/types.h>

#include <security/pam_appl.h>

#include "openpam_impl.h"

/*
 * OpenPAM extension
 *
 * Null conversation function
 */

int
openpam_nullconv(int n,
	 const struct pam_message **msg,
	 struct pam_response **resp,
	 void *data)
{

	ENTER();
	/*LINTED unused*/
	(void)n;
	/*LINTED unused*/
	(void)msg;
	/*LINTED unused*/
	(void)resp;
	/*LINTED unused*/
	(void)data;
	RETURNC(PAM_CONV_ERR);
}

/*
 * Error codes:
 *
 *	PAM_CONV_ERR
 */

/**
 * The =openpam_nullconv function is a null conversation function suitable
 * for applications that want to use PAM but don't support interactive
 * dialog with the user.
 * Such applications should set =PAM_AUTHTOK to whatever authentication
 * token they've obtained on their own before calling =pam_authenticate
 * and / or =pam_chauthtok, and their PAM configuration should specify the
 * ;use_first_pass option for all modules that require access to the
 * authentication token, to make sure they use =PAM_AUTHTOK rather than
 * try to query the user.
 *
 * >openpam_ttyconv
 * >pam_prompt
 * >pam_set_item
 * >pam_vprompt
 */