1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2001 Mark R V Murray
5 * All rights reserved.
6 * Copyright (c) 2001 Networks Associates Technology, Inc.
7 * All rights reserved.
8 *
9 * Portions of this software were developed for the FreeBSD Project by
10 * ThinkSec AS and NAI Labs, the Security Research Division of Network
11 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
12 * ("CBOSS"), as part of the DARPA CHATS research program.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 * 3. The name of the author may not be used to endorse or promote
23 *    products derived from this software without specific prior written
24 *    permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42#include <sys/types.h>
43#include <sys/stat.h>
44#include <pwd.h>
45#include <ttyent.h>
46#include <string.h>
47
48#define PAM_SM_ACCOUNT
49
50#include <security/pam_appl.h>
51#include <security/pam_modules.h>
52#include <security/pam_mod_misc.h>
53
54#define TTY_PREFIX	"/dev/"
55
56PAM_EXTERN int
57pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused,
58    int argc __unused, const char *argv[] __unused)
59{
60	struct passwd *pwd;
61	struct ttyent *ty;
62	const char *user;
63	const void *tty;
64	int pam_err;
65
66	pam_err = pam_get_user(pamh, &user, NULL);
67	if (pam_err != PAM_SUCCESS)
68		return (pam_err);
69	if (user == NULL || (pwd = getpwnam(user)) == NULL)
70		return (PAM_SERVICE_ERR);
71
72	PAM_LOG("Got user: %s", user);
73
74	/* If the user is not root, secure ttys do not apply */
75	if (pwd->pw_uid != 0)
76		return (PAM_SUCCESS);
77
78	pam_err = pam_get_item(pamh, PAM_TTY, &tty);
79	if (pam_err != PAM_SUCCESS)
80		return (pam_err);
81
82	PAM_LOG("Got TTY: %s", (const char *)tty);
83
84	/* Ignore any "/dev/" on the PAM_TTY item */
85	if (tty != NULL && strncmp(TTY_PREFIX, tty, sizeof(TTY_PREFIX)) == 0) {
86		PAM_LOG("WARNING: PAM_TTY starts with " TTY_PREFIX);
87		tty = (const char *)tty + sizeof(TTY_PREFIX) - 1;
88	}
89
90	if (tty != NULL && (ty = getttynam(tty)) != NULL &&
91	    (ty->ty_status & TTY_SECURE) != 0)
92		return (PAM_SUCCESS);
93
94	PAM_VERBOSE_ERROR("Not on secure TTY");
95	return (PAM_AUTH_ERR);
96}
97
98PAM_MODULE_ENTRY("pam_securetty");
99