pam_self.c revision 90229 
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 90229 2002-02-05 06:08:26Z 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_appl.h>
52#include <security/pam_modules.h>
53#include <security/pam_mod_misc.h>
54
55enum {
56	PAM_OPT_EVEN_ROOT	= PAM_OPT_STD_MAX,
57};
58
59static struct opttab other_options[] = {
60	{ "even_root",		PAM_OPT_EVEN_ROOT },
61	{ NULL, 0 }
62};
63
64PAM_EXTERN int
65pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, int argc, const char **argv)
66{
67	struct options options;
68	struct passwd *pwd;
69	const char *luser;
70	int pam_err;
71	uid_t uid;
72
73	pam_std_option(&options, other_options, argc, argv);
74
75	PAM_LOG("Options processed");
76
77	pam_err = pam_get_item(pamh, PAM_USER, (const void **)&luser);
78	if (pam_err != PAM_SUCCESS)
79		PAM_RETURN(pam_err);
80	if (luser == NULL || (pwd = getpwnam(luser)) == NULL)
81		PAM_RETURN(PAM_AUTH_ERR);
82
83	uid = getuid();
84	if (uid == 0 && !pam_test_option(&options, PAM_OPT_EVEN_ROOT, NULL))
85		PAM_RETURN(PAM_AUTH_ERR);
86
87	if (uid == (uid_t)pwd->pw_uid)
88		PAM_RETURN(PAM_SUCCESS);
89
90	PAM_VERBOSE_ERROR("Refused; source and target users differ");
91
92	PAM_RETURN(PAM_AUTH_ERR);
93}
94
95PAM_EXTERN int
96pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
97{
98	struct options options;
99
100	pam_std_option(&options, NULL, argc, argv);
101
102	PAM_LOG("Options processed");
103
104	PAM_RETURN(PAM_SUCCESS);
105}
106
107PAM_EXTERN int
108pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv)
109{
110	struct options options;
111
112	pam_std_option(&options, NULL, argc, argv);
113
114	PAM_LOG("Options processed");
115
116	PAM_RETURN(PAM_IGNORE);
117}
118
119PAM_EXTERN int
120pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
121{
122	struct options options;
123
124	pam_std_option(&options, NULL, argc, argv);
125
126	PAM_LOG("Options processed");
127
128	PAM_RETURN(PAM_IGNORE);
129}
130
131PAM_EXTERN int
132pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
133{
134	struct options options;
135
136	pam_std_option(&options, NULL, argc, argv);
137
138	PAM_LOG("Options processed");
139
140	PAM_RETURN(PAM_IGNORE);
141}
142
143PAM_EXTERN int
144pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
145{
146	struct options options;
147
148	pam_std_option(&options, NULL, argc, argv);
149
150	PAM_LOG("Options processed");
151
152	PAM_RETURN(PAM_IGNORE);
153}
154
155PAM_MODULE_ENTRY("pam_self");
156