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_login_access/pam_login_access.c 326219 2017-11-26 02:00:33Z pfg $
39 */
40
41 #define _BSD_SOURCE
42
43 #include <sys/param.h>
44
45 #include <syslog.h>
46 #include <unistd.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 #include "pam_login_access.h"
55
56 PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t * pamh,int flags __unused,int argc __unused,const char * argv[]__unused)57 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
58 int argc __unused, const char *argv[] __unused)
59 {
60 const void *rhost, *tty, *user;
61 char hostname[MAXHOSTNAMELEN];
62 int pam_err;
63
64 pam_err = pam_get_item(pamh, PAM_USER, &user);
65 if (pam_err != PAM_SUCCESS)
66 return (pam_err);
67
68 if (user == NULL)
69 return (PAM_SERVICE_ERR);
70
71 PAM_LOG("Got user: %s", (const char *)user);
72
73 pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
74 if (pam_err != PAM_SUCCESS)
75 return (pam_err);
76
77 pam_err = pam_get_item(pamh, PAM_TTY, &tty);
78 if (pam_err != PAM_SUCCESS)
79 return (pam_err);
80
81 gethostname(hostname, sizeof hostname);
82
83 if (rhost != NULL && *(const char *)rhost != '\0') {
84 PAM_LOG("Checking login.access for user %s from host %s",
85 (const char *)user, (const char *)rhost);
86 if (login_access(user, rhost) != 0)
87 return (PAM_SUCCESS);
88 PAM_VERBOSE_ERROR("%s is not allowed to log in from %s",
89 (const char *)user, (const char *)rhost);
90 } else if (tty != NULL && *(const char *)tty != '\0') {
91 PAM_LOG("Checking login.access for user %s on tty %s",
92 (const char *)user, (const char *)tty);
93 if (login_access(user, tty) != 0)
94 return (PAM_SUCCESS);
95 PAM_VERBOSE_ERROR("%s is not allowed to log in on %s",
96 (const char *)user, (const char *)tty);
97 } else {
98 PAM_LOG("Checking login.access for user %s",
99 (const char *)user);
100 if (login_access(user, "***unknown***") != 0)
101 return (PAM_SUCCESS);
102 PAM_VERBOSE_ERROR("%s is not allowed to log in",
103 (const char *)user);
104 }
105
106 return (PAM_AUTH_ERR);
107 }
108
109 PAM_MODULE_ENTRY("pam_login_access");
110