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 * $FreeBSD: head/lib/libpam/modules/pam_securetty/pam_securetty.c 326219 2017-11-26 02:00:33Z pfg $
39 */
40
41 #include <sys/types.h>
42 #include <sys/stat.h>
43 #include <pwd.h>
44 #include <ttyent.h>
45 #include <string.h>
46
47 #define PAM_SM_ACCOUNT
48
49 #include <security/pam_appl.h>
50 #include <security/pam_modules.h>
51 #include <security/pam_mod_misc.h>
52
53 #define TTY_PREFIX "/dev/"
54
55 PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t * pamh __unused,int flags __unused,int argc __unused,const char * argv[]__unused)56 pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused,
57 int argc __unused, const char *argv[] __unused)
58 {
59 struct passwd *pwd;
60 struct ttyent *ty;
61 const char *user;
62 const void *tty;
63 int pam_err;
64
65 pam_err = pam_get_user(pamh, &user, NULL);
66 if (pam_err != PAM_SUCCESS)
67 return (pam_err);
68 if (user == NULL || (pwd = getpwnam(user)) == NULL)
69 return (PAM_SERVICE_ERR);
70
71 PAM_LOG("Got user: %s", user);
72
73 /* If the user is not root, secure ttys do not apply */
74 if (pwd->pw_uid != 0)
75 return (PAM_SUCCESS);
76
77 pam_err = pam_get_item(pamh, PAM_TTY, &tty);
78 if (pam_err != PAM_SUCCESS)
79 return (pam_err);
80
81 PAM_LOG("Got TTY: %s", (const char *)tty);
82
83 /* Ignore any "/dev/" on the PAM_TTY item */
84 if (tty != NULL && strncmp(TTY_PREFIX, tty, sizeof(TTY_PREFIX)) == 0) {
85 PAM_LOG("WARNING: PAM_TTY starts with " TTY_PREFIX);
86 tty = (const char *)tty + sizeof(TTY_PREFIX) - 1;
87 }
88
89 if (tty != NULL && (ty = getttynam(tty)) != NULL &&
90 (ty->ty_status & TTY_SECURE) != 0)
91 return (PAM_SUCCESS);
92
93 PAM_VERBOSE_ERROR("Not on secure TTY");
94 return (PAM_AUTH_ERR);
95 }
96
97 PAM_MODULE_ENTRY("pam_securetty");
98