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 #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
52 PAM_EXTERN int
pam_sm_authenticate(pam_handle_t * pamh,int flags __unused,int argc __unused,const char * argv[]__unused)53 pam_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
87 PAM_EXTERN int
pam_sm_setcred(pam_handle_t * pamh __unused,int flags __unused,int argc __unused,const char * argv[]__unused)88 pam_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
95 PAM_MODULE_ENTRY("pam_rhosts");
96