1132720Skan/*-
2132720Skan * SPDX-License-Identifier: BSD-3-Clause
3132720Skan *
4132720Skan * Copyright (c) 2001 Mark R V Murray
5132720Skan * All rights reserved.
6132720Skan * Copyright (c) 2001 Networks Associates Technology, Inc.
7132720Skan * All rights reserved.
8132720Skan *
9132720Skan * Portions of this software were developed for the FreeBSD Project by
10132720Skan * ThinkSec AS and NAI Labs, the Security Research Division of Network
11132720Skan * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
12132720Skan * ("CBOSS"), as part of the DARPA CHATS research program.
13132720Skan *
14132720Skan * Redistribution and use in source and binary forms, with or without
15132720Skan * modification, are permitted provided that the following conditions
16132720Skan * are met:
17132720Skan * 1. Redistributions of source code must retain the above copyright
18132720Skan *    notice, this list of conditions and the following disclaimer.
19132720Skan * 2. Redistributions in binary form must reproduce the above copyright
20132720Skan *    notice, this list of conditions and the following disclaimer in the
21132720Skan *    documentation and/or other materials provided with the distribution.
22132720Skan * 3. The name of the author may not be used to endorse or promote
23132720Skan *    products derived from this software without specific prior written
24132720Skan *    permission.
25132720Skan *
26132720Skan * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27132720Skan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28132720Skan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29132720Skan * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30132720Skan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31132720Skan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32132720Skan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33132720Skan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34132720Skan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35132720Skan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36132720Skan * SUCH DAMAGE.
37132720Skan */
38132720Skan
39132720Skan#include <sys/types.h>
40132720Skan#include <sys/stat.h>
41132720Skan#include <pwd.h>
42132720Skan#include <ttyent.h>
43132720Skan#include <string.h>
44132720Skan
45132720Skan#define PAM_SM_ACCOUNT
46132720Skan
47132720Skan#include <security/pam_appl.h>
48132720Skan#include <security/pam_modules.h>
49132720Skan#include <security/pam_mod_misc.h>
50132720Skan
51132720Skan#define TTY_PREFIX	"/dev/"
52
53PAM_EXTERN int
54pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused,
55    int argc __unused, const char *argv[] __unused)
56{
57	struct passwd *pwd;
58	struct ttyent *ty;
59	const char *user;
60	const void *tty;
61	int pam_err;
62
63	pam_err = pam_get_user(pamh, &user, NULL);
64	if (pam_err != PAM_SUCCESS)
65		return (pam_err);
66	if (user == NULL || (pwd = getpwnam(user)) == NULL)
67		return (PAM_SERVICE_ERR);
68
69	PAM_LOG("Got user: %s", user);
70
71	/* If the user is not root, secure ttys do not apply */
72	if (pwd->pw_uid != 0)
73		return (PAM_SUCCESS);
74
75	pam_err = pam_get_item(pamh, PAM_TTY, &tty);
76	if (pam_err != PAM_SUCCESS)
77		return (pam_err);
78
79	PAM_LOG("Got TTY: %s", (const char *)tty);
80
81	/* Ignore any "/dev/" on the PAM_TTY item */
82	if (tty != NULL && strncmp(TTY_PREFIX, tty, sizeof(TTY_PREFIX)) == 0) {
83		PAM_LOG("WARNING: PAM_TTY starts with " TTY_PREFIX);
84		tty = (const char *)tty + sizeof(TTY_PREFIX) - 1;
85	}
86
87	if (tty != NULL && (ty = getttynam(tty)) != NULL &&
88	    (ty->ty_status & TTY_SECURE) != 0)
89		return (PAM_SUCCESS);
90
91	PAM_VERBOSE_ERROR("Not on secure TTY");
92	return (PAM_AUTH_ERR);
93}
94
95PAM_MODULE_ENTRY("pam_securetty");
96