freebsd-dev/contrib/openpam/lib/pam_get_authtok.c

/*-
 * Copyright (c) 2002 Networks Associates Technologies, Inc.
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project by ThinkSec AS and
 * NAI Labs, 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.
 *
 * $Id$
 */

#include <sys/param.h>

#include <security/pam_appl.h>
#include <security/openpam.h>

#include "openpam_impl.h"

/*
 * OpenPAM extension
 *
 * Retrieve authentication token
 */

int
pam_get_authtok(pam_handle_t *pamh,
	const char **authtok,
	const char *prompt)
{
	char *p, *resp;
	int r;

	if (pamh == NULL || authtok == NULL)
		return (PAM_SYSTEM_ERR);

	r = pam_get_item(pamh, PAM_AUTHTOK, (const void **)authtok);
	if (r == PAM_SUCCESS && *authtok != NULL)
		return (PAM_SUCCESS);
	if (prompt == NULL) {
		if (pam_get_item(pamh, PAM_AUTHTOK_PROMPT,
		    (const void **)&p) != PAM_SUCCESS || p == NULL)
			prompt = "Password:";
	}
	r = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &resp,
	    "%s", prompt ? prompt : p);
	if (r != PAM_SUCCESS)
		return (r);
	*authtok = resp;
	return (pam_set_item(pamh, PAM_AUTHTOK, *authtok));
}