pam_securetty.c revision 89760 
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 89760 2002-01-24 18:37:17Z 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, int flags __unused, int argc, const char **argv)
58{
59	struct options options;
60	struct ttyent *ttyfileinfo;
61	struct passwd *pwd;
62	int retval;
63	const char *user, *ttyname;
64
65	pam_std_option(&options, NULL, argc, argv);
66
67	PAM_LOG("Options processed");
68
69	retval = pam_get_user(pamh, &user, NULL);
70	if (retval != PAM_SUCCESS)
71		PAM_RETURN(retval);
72
73	PAM_LOG("Got user: %s", user);
74
75	retval = pam_get_item(pamh, PAM_TTY, (const void **)&ttyname);
76	if (retval != PAM_SUCCESS)
77		PAM_RETURN(retval);
78
79	PAM_LOG("Got TTY: %s", ttyname);
80
81	/* Ignore any "/dev/" on the PAM_TTY item */
82	if (strncmp(TTY_PREFIX, ttyname, sizeof(TTY_PREFIX) - 1) == 0)
83		ttyname += sizeof(TTY_PREFIX) - 1;
84
85	/* If the user is not root, secure ttys do not apply */
86	pwd = getpwnam(user);
87	if (pwd == NULL)
88		PAM_RETURN(PAM_IGNORE);
89	else if (pwd->pw_uid != 0)
90		PAM_RETURN(PAM_SUCCESS);
91
92	PAM_LOG("User is not root");
93
94	ttyfileinfo = getttynam(ttyname);
95	if (ttyfileinfo == NULL)
96		PAM_RETURN(PAM_SERVICE_ERR);
97
98	PAM_LOG("Got ttyfileinfo");
99
100	if (ttyfileinfo->ty_status & TTY_SECURE)
101		PAM_RETURN(PAM_SUCCESS);
102	else {
103		PAM_VERBOSE_ERROR("Not on secure TTY");
104		PAM_RETURN(PAM_PERM_DENIED);
105	}
106}
107
108PAM_EXTERN
109int
110pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused, int argc, const char **argv)
111{
112	struct options options;
113
114	pam_std_option(&options, NULL, argc, argv);
115
116	PAM_LOG("Options processed");
117
118	PAM_RETURN(PAM_SUCCESS);
119}
120
121PAM_EXTERN int
122pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv)
123{
124	struct options options;
125
126	pam_std_option(&options, NULL, argc, argv);
127
128	PAM_LOG("Options processed");
129
130	PAM_RETURN(PAM_IGNORE);
131}
132
133PAM_EXTERN int
134pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
135{
136	struct options options;
137
138	pam_std_option(&options, NULL, argc, argv);
139
140	PAM_LOG("Options processed");
141
142	PAM_RETURN(PAM_IGNORE);
143}
144
145PAM_EXTERN int
146pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
147{
148	struct options options;
149
150	pam_std_option(&options, NULL, argc, argv);
151
152	PAM_LOG("Options processed");
153
154	PAM_RETURN(PAM_IGNORE);
155}
156
157PAM_EXTERN int
158pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
159{
160	struct options options;
161
162	pam_std_option(&options, NULL, argc, argv);
163
164	PAM_LOG("Options processed");
165
166	PAM_RETURN(PAM_IGNORE);
167}
168
169PAM_MODULE_ENTRY("pam_securetty");
170