pam_rhosts.c revision 331722 
1/*-
2 * Copyright (c) 2002 Danny Braniss
3 * All rights reserved.
4 * Copyright (c) 2001,2002 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote
21 *    products derived from this software without specific prior written
22 *    permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: stable/11/lib/libpam/modules/pam_rhosts/pam_rhosts.c 331722 2018-03-29 02:50:57Z eadler $");
39
40#include <pwd.h>
41#include <stddef.h>
42#include <string.h>
43#include <unistd.h>
44
45#define PAM_SM_AUTH
46#include <security/pam_appl.h>
47#include <security/pam_modules.h>
48#include <security/pam_mod_misc.h>
49
50#define OPT_ALLOW_ROOT "allow_root"
51
52PAM_EXTERN int
53pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
54    int argc __unused, const char *argv[] __unused)
55{
56	struct passwd *pw;
57	const char *user;
58	const void *ruser, *rhost;
59	int err, superuser;
60
61	err = pam_get_user(pamh, &user, NULL);
62	if (err != PAM_SUCCESS)
63		return (err);
64
65	if ((pw = getpwnam(user)) == NULL)
66		return (PAM_USER_UNKNOWN);
67	if (pw->pw_uid == 0 &&
68	    openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL)
69		return (PAM_AUTH_ERR);
70
71	err = pam_get_item(pamh, PAM_RUSER, &ruser);
72	if (err != PAM_SUCCESS)
73		return (PAM_AUTH_ERR);
74
75	err = pam_get_item(pamh, PAM_RHOST, &rhost);
76	if (err != PAM_SUCCESS)
77		return (PAM_AUTH_ERR);
78
79	superuser = (strcmp(user, "root") == 0);
80	err = ruserok(rhost, superuser, ruser, user);
81	if (err != 0)
82		return (PAM_AUTH_ERR);
83
84	return (PAM_SUCCESS);
85}
86
87PAM_EXTERN int
88pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
89    int argc __unused, const char *argv[] __unused)
90{
91
92	return (PAM_SUCCESS);
93}
94
95PAM_MODULE_ENTRY("pam_rhosts");
96