pam_login_access.c revision 331722 
1/*-
2 * Copyright (c) 2001 Mark R V Murray
3 * All rights reserved.
4 * Copyright (c) 2001 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote
21 *    products derived from this software without specific prior written
22 *    permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: stable/11/lib/libpam/modules/pam_login_access/pam_login_access.c 331722 2018-03-29 02:50:57Z eadler $");
39
40#define _BSD_SOURCE
41
42#include <sys/param.h>
43
44#include <syslog.h>
45#include <unistd.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#include "pam_login_access.h"
54
55PAM_EXTERN int
56pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
57    int argc __unused, const char *argv[] __unused)
58{
59	const void *rhost, *tty, *user;
60	char hostname[MAXHOSTNAMELEN];
61	int pam_err;
62
63	pam_err = pam_get_item(pamh, PAM_USER, &user);
64	if (pam_err != PAM_SUCCESS)
65		return (pam_err);
66
67	if (user == NULL)
68		return (PAM_SERVICE_ERR);
69
70	PAM_LOG("Got user: %s", (const char *)user);
71
72	pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
73	if (pam_err != PAM_SUCCESS)
74		return (pam_err);
75
76	pam_err = pam_get_item(pamh, PAM_TTY, &tty);
77	if (pam_err != PAM_SUCCESS)
78		return (pam_err);
79
80	gethostname(hostname, sizeof hostname);
81
82	if (rhost != NULL && *(const char *)rhost != '\0') {
83		PAM_LOG("Checking login.access for user %s from host %s",
84		    (const char *)user, (const char *)rhost);
85		if (login_access(user, rhost) != 0)
86			return (PAM_SUCCESS);
87		PAM_VERBOSE_ERROR("%s is not allowed to log in from %s",
88		    (const char *)user, (const char *)rhost);
89	} else if (tty != NULL && *(const char *)tty != '\0') {
90		PAM_LOG("Checking login.access for user %s on tty %s",
91		    (const char *)user, (const char *)tty);
92		if (login_access(user, tty) != 0)
93			return (PAM_SUCCESS);
94		PAM_VERBOSE_ERROR("%s is not allowed to log in on %s",
95		    (const char *)user, (const char *)tty);
96	} else {
97		PAM_LOG("Checking login.access for user %s",
98		    (const char *)user);
99		if (login_access(user, "***unknown***") != 0)
100			return (PAM_SUCCESS);
101		PAM_VERBOSE_ERROR("%s is not allowed to log in",
102		    (const char *)user);
103	}
104
105	return (PAM_AUTH_ERR);
106}
107
108PAM_MODULE_ENTRY("pam_login_access");
109