pam_securetty.c revision 90145 
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 90145 2002-02-03 15:17:57Z markm $");
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_modules.h>
52#include <pam_mod_misc.h>
53
54#define TTY_PREFIX	"/dev/"
55
56PAM_EXTERN int
57pam_sm_authenticate(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
58{
59	struct options options;
60
61	pam_std_option(&options, NULL, argc, argv);
62
63	PAM_LOG("Options processed");
64
65	PAM_RETURN(PAM_IGNORE);
66}
67
68PAM_EXTERN
69int
70pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
71{
72	struct options options;
73
74	pam_std_option(&options, NULL, argc, argv);
75
76	PAM_LOG("Options processed");
77
78	PAM_RETURN(PAM_SUCCESS);
79}
80
81PAM_EXTERN int
82pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv)
83{
84	struct options options;
85	struct passwd *pwd;
86	struct ttyent *ty;
87	const char *user, *tty;
88	int pam_err;
89
90	pam_std_option(&options, NULL, argc, argv);
91
92	PAM_LOG("Options processed");
93
94	pam_err = pam_get_user(pamh, &user, NULL);
95	if (pam_err != PAM_SUCCESS)
96		PAM_RETURN(pam_err);
97	if (user == NULL || (pwd = getpwnam(user)) == NULL)
98		PAM_RETURN(PAM_SERVICE_ERR);
99
100	PAM_LOG("Got user: %s", user);
101
102	/* If the user is not root, secure ttys do not apply */
103	if (pwd->pw_uid != 0)
104		PAM_RETURN(PAM_SUCCESS);
105
106	pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
107	if (pam_err != PAM_SUCCESS)
108		PAM_RETURN(pam_err);
109
110	PAM_LOG("Got TTY: %s", tty);
111
112	/* Ignore any "/dev/" on the PAM_TTY item */
113	if (tty != NULL && strncmp(TTY_PREFIX, tty, sizeof(TTY_PREFIX)) == 0) {
114		PAM_LOG("WARNING: PAM_TTY starts with " TTY_PREFIX);
115		tty += sizeof(TTY_PREFIX) - 1;
116	}
117
118	if (tty != NULL && (ty = getttynam(tty)) != NULL &&
119	    (ty->ty_status & TTY_SECURE) != 0)
120		PAM_RETURN(PAM_SUCCESS);
121
122	PAM_VERBOSE_ERROR("Not on secure TTY");
123	PAM_RETURN(PAM_AUTH_ERR);
124}
125
126PAM_EXTERN int
127pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
128{
129	struct options options;
130
131	pam_std_option(&options, NULL, argc, argv);
132
133	PAM_LOG("Options processed");
134
135	PAM_RETURN(PAM_IGNORE);
136}
137
138PAM_EXTERN int
139pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
140{
141	struct options options;
142
143	pam_std_option(&options, NULL, argc, argv);
144
145	PAM_LOG("Options processed");
146
147	PAM_RETURN(PAM_IGNORE);
148}
149
150PAM_EXTERN int
151pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
152{
153	struct options options;
154
155	pam_std_option(&options, NULL, argc, argv);
156
157	PAM_LOG("Options processed");
158
159	PAM_RETURN(PAM_IGNORE);
160}
161
162PAM_MODULE_ENTRY("pam_securetty");
163