pam_securetty.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_securetty/pam_securetty.c 90229 2002-02-05 06:08:26Z des $");
39
40#include <sys/types.h>
41#include <sys/stat.h>
42#include <pwd.h>
43#include <ttyent.h>
44#include <string.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
55#define TTY_PREFIX	"/dev/"
56
57PAM_EXTERN int
58pam_sm_authenticate(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
59{
60	struct options options;
61
62	pam_std_option(&options, NULL, argc, argv);
63
64	PAM_LOG("Options processed");
65
66	PAM_RETURN(PAM_IGNORE);
67}
68
69PAM_EXTERN
70int
71pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
72{
73	struct options options;
74
75	pam_std_option(&options, NULL, argc, argv);
76
77	PAM_LOG("Options processed");
78
79	PAM_RETURN(PAM_SUCCESS);
80}
81
82PAM_EXTERN int
83pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv)
84{
85	struct options options;
86	struct passwd *pwd;
87	struct ttyent *ty;
88	const char *user, *tty;
89	int pam_err;
90
91	pam_std_option(&options, NULL, argc, argv);
92
93	PAM_LOG("Options processed");
94
95	pam_err = pam_get_user(pamh, &user, NULL);
96	if (pam_err != PAM_SUCCESS)
97		PAM_RETURN(pam_err);
98	if (user == NULL || (pwd = getpwnam(user)) == NULL)
99		PAM_RETURN(PAM_SERVICE_ERR);
100
101	PAM_LOG("Got user: %s", user);
102
103	/* If the user is not root, secure ttys do not apply */
104	if (pwd->pw_uid != 0)
105		PAM_RETURN(PAM_SUCCESS);
106
107	pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
108	if (pam_err != PAM_SUCCESS)
109		PAM_RETURN(pam_err);
110
111	PAM_LOG("Got TTY: %s", tty);
112
113	/* Ignore any "/dev/" on the PAM_TTY item */
114	if (tty != NULL && strncmp(TTY_PREFIX, tty, sizeof(TTY_PREFIX)) == 0) {
115		PAM_LOG("WARNING: PAM_TTY starts with " TTY_PREFIX);
116		tty += sizeof(TTY_PREFIX) - 1;
117	}
118
119	if (tty != NULL && (ty = getttynam(tty)) != NULL &&
120	    (ty->ty_status & TTY_SECURE) != 0)
121		PAM_RETURN(PAM_SUCCESS);
122
123	PAM_VERBOSE_ERROR("Not on secure TTY");
124	PAM_RETURN(PAM_AUTH_ERR);
125}
126
127PAM_EXTERN int
128pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
129{
130	struct options options;
131
132	pam_std_option(&options, NULL, argc, argv);
133
134	PAM_LOG("Options processed");
135
136	PAM_RETURN(PAM_IGNORE);
137}
138
139PAM_EXTERN int
140pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
141{
142	struct options options;
143
144	pam_std_option(&options, NULL, argc, argv);
145
146	PAM_LOG("Options processed");
147
148	PAM_RETURN(PAM_IGNORE);
149}
150
151PAM_EXTERN int
152pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
153{
154	struct options options;
155
156	pam_std_option(&options, NULL, argc, argv);
157
158	PAM_LOG("Options processed");
159
160	PAM_RETURN(PAM_IGNORE);
161}
162
163PAM_MODULE_ENTRY("pam_securetty");
164