1 /* $NetBSD: pam_rhosts.c,v 1.4 2005/04/19 03:15:36 christos Exp $ */
2
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 #ifdef __FreeBSD__
41 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_rhosts/pam_rhosts.c,v 1.3 2003/12/11 13:55:16 des Exp $");
42 #else
43 __RCSID("$NetBSD: pam_rhosts.c,v 1.4 2005/04/19 03:15:36 christos Exp $");
44 #endif
45
46 #include <pwd.h>
47 #include <stddef.h>
48 #include <string.h>
49 #include <unistd.h>
50
51 #define PAM_SM_AUTH
52 #include <security/pam_appl.h>
53 #include <security/pam_modules.h>
54 #include <security/pam_mod_misc.h>
55
56 #define OPT_ALLOW_ROOT "allow_root"
57
58 PAM_EXTERN int
pam_sm_authenticate(pam_handle_t * pamh,int flags __unused,int argc __unused,const char * argv[]__unused)59 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
60 int argc __unused, const char *argv[] __unused)
61 {
62 struct passwd *pwd, pwres;
63 const char *user;
64 const void *ruser, *rhost;
65 int err, superuser;
66 char pwbuf[1024];
67
68 err = pam_get_user(pamh, &user, NULL);
69 if (err != PAM_SUCCESS)
70 return (err);
71
72 if (getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
73 pwd == NULL)
74 return (PAM_USER_UNKNOWN);
75 if (pwd->pw_uid == 0 &&
76 openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL)
77 return (PAM_AUTH_ERR);
78
79 err = pam_get_item(pamh, PAM_RUSER, &ruser);
80 if (err != PAM_SUCCESS)
81 return (PAM_AUTH_ERR);
82
83 err = pam_get_item(pamh, PAM_RHOST, &rhost);
84 if (err != PAM_SUCCESS)
85 return (PAM_AUTH_ERR);
86
87 superuser = (strcmp(user, "root") == 0);
88 err = ruserok(rhost, superuser, ruser, user);
89 if (err != 0)
90 return (PAM_AUTH_ERR);
91
92 return (PAM_SUCCESS);
93 }
94
95 PAM_EXTERN int
pam_sm_setcred(pam_handle_t * pamh __unused,int flags __unused,int argc __unused,const char * argv[]__unused)96 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
97 int argc __unused, const char *argv[] __unused)
98 {
99
100 return (PAM_SUCCESS);
101 }
102
103 PAM_MODULE_ENTRY("pam_rhosts");
104