1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2002 Danny Braniss
5 * All rights reserved.
6 * Copyright (c) 2001,2002 Networks Associates Technology, Inc.
7 * All rights reserved.
8 *
9 * Portions of this software were developed for the FreeBSD Project by
10 * ThinkSec AS and NAI Labs, the Security Research Division of Network
11 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
12 * ("CBOSS"), as part of the DARPA CHATS research program.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 * 3. The name of the author may not be used to endorse or promote
23 *    products derived from this software without specific prior written
24 *    permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42#include <pwd.h>
43#include <stddef.h>
44#include <string.h>
45#include <unistd.h>
46
47#define PAM_SM_AUTH
48#include <security/pam_appl.h>
49#include <security/pam_modules.h>
50#include <security/pam_mod_misc.h>
51
52#define OPT_ALLOW_ROOT "allow_root"
53
54PAM_EXTERN int
55pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
56    int argc __unused, const char *argv[] __unused)
57{
58	struct passwd *pw;
59	const char *user;
60	const void *ruser, *rhost;
61	int err, superuser;
62
63	err = pam_get_user(pamh, &user, NULL);
64	if (err != PAM_SUCCESS)
65		return (err);
66
67	if ((pw = getpwnam(user)) == NULL)
68		return (PAM_USER_UNKNOWN);
69	if (pw->pw_uid == 0 &&
70	    openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL)
71		return (PAM_AUTH_ERR);
72
73	err = pam_get_item(pamh, PAM_RUSER, &ruser);
74	if (err != PAM_SUCCESS)
75		return (PAM_AUTH_ERR);
76
77	err = pam_get_item(pamh, PAM_RHOST, &rhost);
78	if (err != PAM_SUCCESS)
79		return (PAM_AUTH_ERR);
80
81	superuser = (strcmp(user, "root") == 0);
82	err = ruserok(rhost, superuser, ruser, user);
83	if (err != 0)
84		return (PAM_AUTH_ERR);
85
86	return (PAM_SUCCESS);
87}
88
89PAM_EXTERN int
90pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
91    int argc __unused, const char *argv[] __unused)
92{
93
94	return (PAM_SUCCESS);
95}
96
97PAM_MODULE_ENTRY("pam_rhosts");
98