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#define _BSD_SOURCE
43
44#include <sys/param.h>
45#include <sys/types.h>
46
47#include <syslog.h>
48#include <unistd.h>
49
50#define PAM_SM_ACCOUNT
51
52#include <security/pam_appl.h>
53#include <security/pam_modules.h>
54#include <security/pam_mod_misc.h>
55#include <security/openpam.h>
56
57#include "pam_login_access.h"
58
59#define OPT_ACCESSFILE		"accessfile"
60#define OPT_NOAUDIT		"noaudit"
61#define OPT_FIELDSEP		"fieldsep"
62#define OPT_LISTSEP		"listsep"
63#define OPT_NODEFGROUP		"nodefgroup"
64
65#define _PATH_LOGACCESS		"/etc/login.access"
66#define _FIELD_SEPARATOR	":"
67#define _LIST_SEPARATOR		", \t"
68
69PAM_EXTERN int
70pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
71    int argc __unused, const char *argv[] __unused)
72{
73	struct pam_login_access_options	login_access_opts;
74	const void *rhost, *tty, *user;
75	char hostname[MAXHOSTNAMELEN];
76	int pam_err;
77
78	pam_err = pam_get_item(pamh, PAM_USER, &user);
79	if (pam_err != PAM_SUCCESS)
80		return (pam_err);
81
82	if (user == NULL)
83		return (PAM_SERVICE_ERR);
84
85	PAM_LOG("Got user: %s", (const char *)user);
86
87	pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
88	if (pam_err != PAM_SUCCESS)
89		return (pam_err);
90
91	pam_err = pam_get_item(pamh, PAM_TTY, &tty);
92	if (pam_err != PAM_SUCCESS)
93		return (pam_err);
94
95	gethostname(hostname, sizeof hostname);
96	login_access_opts.defgroup = openpam_get_option(pamh, OPT_NODEFGROUP) == NULL ? true : false;
97	login_access_opts.audit = openpam_get_option(pamh, OPT_NOAUDIT) == NULL ? true : false;
98	if ((login_access_opts.accessfile = openpam_get_option(pamh, OPT_ACCESSFILE)) == NULL)
99		login_access_opts.accessfile = _PATH_LOGACCESS;
100	if ((login_access_opts.fieldsep = openpam_get_option(pamh, OPT_FIELDSEP)) == NULL)
101		login_access_opts.fieldsep = _FIELD_SEPARATOR;
102	if ((login_access_opts.listsep = openpam_get_option(pamh, OPT_LISTSEP)) == NULL)
103		login_access_opts.listsep = _LIST_SEPARATOR;
104
105	if (rhost != NULL && *(const char *)rhost != '\0') {
106		PAM_LOG("Checking login.access for user %s from host %s",
107		    (const char *)user, (const char *)rhost);
108		if (login_access(user, rhost, &login_access_opts) != 0)
109			return (PAM_SUCCESS);
110		PAM_VERBOSE_ERROR("%s is not allowed to log in from %s",
111		    (const char *)user, (const char *)rhost);
112	} else if (tty != NULL && *(const char *)tty != '\0') {
113		PAM_LOG("Checking login.access for user %s on tty %s",
114		    (const char *)user, (const char *)tty);
115		if (login_access(user, tty, &login_access_opts) != 0)
116			return (PAM_SUCCESS);
117		PAM_VERBOSE_ERROR("%s is not allowed to log in on %s",
118		    (const char *)user, (const char *)tty);
119	} else {
120		PAM_LOG("Checking login.access for user %s",
121		    (const char *)user);
122		if (login_access(user, "***unknown***", &login_access_opts) != 0)
123			return (PAM_SUCCESS);
124		PAM_VERBOSE_ERROR("%s is not allowed to log in",
125		    (const char *)user);
126	}
127
128	return (PAM_AUTH_ERR);
129}
130
131PAM_MODULE_ENTRY("pam_login_access");
132