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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2003 Networks Associates Technology, Inc.
* All rights reserved.
*
* Portions of this software were 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <string.h>
#define PAM_SM_AUTH
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/openpam.h>
#define DEFAULT_GUESTS "guest"
static int
lookup(const char *str, const char *list)
{
const char *next;
size_t len;
len = strlen(str);
while (*list != '\0') {
while (*list == ',')
++list;
if ((next = strchr(list, ',')) == NULL)
next = strchr(list, '\0');
if (next - list == (ptrdiff_t)len &&
strncmp(list, str, len) == 0)
return (1);
list = next;
}
return (0);
}
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
const char *authtok, *guests, *user;
int err, is_guest;
/* get target account */
if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL)
return (PAM_AUTH_ERR);
/* get list of guest logins */
if ((guests = openpam_get_option(pamh, "guests")) == NULL)
guests = DEFAULT_GUESTS;
/* check if the target account is on the list */
is_guest = lookup(user, guests);
/* check password */
if (!openpam_get_option(pamh, "nopass")) {
err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL);
if (err != PAM_SUCCESS)
return (err);
if (openpam_get_option(pamh, "pass_is_user") &&
strcmp(user, authtok) != 0)
return (PAM_AUTH_ERR);
if (openpam_get_option(pamh, "pass_as_ruser"))
pam_set_item(pamh, PAM_RUSER, authtok);
}
/* done */
if (is_guest) {
pam_setenv(pamh, "GUEST", user, 1);
return (PAM_SUCCESS);
}
return (PAM_AUTH_ERR);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
return (PAM_SUCCESS);
}
PAM_MODULE_ENTRY("pam_guest");
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