pam_self.c revision 89733 
1/*-
2 * Copyright (c) 2001 Mark R V Murray
3 * All rights reserved.
4 * Copyright (c) 2001 Networks Associates Technologies, 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: head/lib/libpam/modules/pam_self/pam_self.c 89733 2002-01-24 12:47:42Z des $");
39
40#define _BSD_SOURCE
41
42#include <pwd.h>
43#include <unistd.h>
44#include <syslog.h>
45
46#define PAM_SM_AUTH
47#define PAM_SM_ACCOUNT
48#define PAM_SM_SESSION
49#define PAM_SM_PASSWORD
50
51#include <security/pam_modules.h>
52#include <pam_mod_misc.h>
53
54enum {
55	PAM_OPT_EVEN_ROOT	= PAM_OPT_STD_MAX,
56};
57
58static struct opttab other_options[] = {
59	{ "even_root",		PAM_OPT_EVEN_ROOT },
60	{ NULL, 0 }
61};
62
63PAM_EXTERN int
64pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
65{
66	struct options options;
67	struct passwd *pwd;
68	const char *luser;
69	int pam_err;
70	uid_t uid;
71
72	pam_std_option(&options, other_options, argc, argv);
73
74	PAM_LOG("Options processed");
75
76	pam_err = pam_get_item(pamh, PAM_USER, (const void **)&luser);
77	if (pam_err != PAM_SUCCESS)
78		PAM_RETURN(pam_err);
79	if (luser == NULL || (pwd = getpwnam(luser)) == NULL)
80		PAM_RETURN(PAM_AUTH_ERR);
81
82	uid = getuid();
83	if (uid == 0 && !pam_test_option(&options, PAM_OPT_EVEN_ROOT, NULL))
84		PAM_RETURN(PAM_AUTH_ERR);
85
86	if (uid == (uid_t)pwd->pw_uid)
87		PAM_RETURN(PAM_SUCCESS);
88
89	PAM_VERBOSE_ERROR("Refused; source and target users differ");
90
91	PAM_RETURN(PAM_AUTH_ERR);
92}
93
94PAM_EXTERN int
95pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
96{
97	struct options options;
98
99	pam_std_option(&options, NULL, argc, argv);
100
101	PAM_LOG("Options processed");
102
103	PAM_RETURN(PAM_SUCCESS);
104}
105
106PAM_EXTERN int
107pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc ,const char **argv)
108{
109	struct options options;
110
111	pam_std_option(&options, NULL, argc, argv);
112
113	PAM_LOG("Options processed");
114
115	PAM_RETURN(PAM_IGNORE);
116}
117
118PAM_EXTERN int
119pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv)
120{
121	struct options options;
122
123	pam_std_option(&options, NULL, argc, argv);
124
125	PAM_LOG("Options processed");
126
127	PAM_RETURN(PAM_IGNORE);
128}
129
130PAM_EXTERN int
131pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
132{
133	struct options options;
134
135	pam_std_option(&options, NULL, argc, argv);
136
137	PAM_LOG("Options processed");
138
139	PAM_RETURN(PAM_IGNORE);
140}
141
142PAM_EXTERN int
143pam_sm_close_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
144{
145	struct options options;
146
147	pam_std_option(&options, NULL, argc, argv);
148
149	PAM_LOG("Options processed");
150
151	PAM_RETURN(PAM_IGNORE);
152}
153
154PAM_MODULE_ENTRY("pam_self");
155