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 #define _BSD_SOURCE
41
42 #include <sys/param.h>
43 #include <sys/types.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 #include <security/openpam.h>
54
55 #include "pam_login_access.h"
56
57 #define OPT_ACCESSFILE "accessfile"
58 #define OPT_NOAUDIT "noaudit"
59 #define OPT_FIELDSEP "fieldsep"
60 #define OPT_LISTSEP "listsep"
61 #define OPT_NODEFGROUP "nodefgroup"
62
63 #define _PATH_LOGACCESS "/etc/login.access"
64 #define _FIELD_SEPARATOR ":"
65 #define _LIST_SEPARATOR ", \t"
66
67 PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t * pamh,int flags __unused,int argc __unused,const char * argv[]__unused)68 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
69 int argc __unused, const char *argv[] __unused)
70 {
71 struct pam_login_access_options login_access_opts;
72 const void *rhost, *tty, *user;
73 char hostname[MAXHOSTNAMELEN];
74 int pam_err;
75
76 pam_err = pam_get_item(pamh, PAM_USER, &user);
77 if (pam_err != PAM_SUCCESS)
78 return (pam_err);
79
80 if (user == NULL)
81 return (PAM_SERVICE_ERR);
82
83 PAM_LOG("Got user: %s", (const char *)user);
84
85 pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
86 if (pam_err != PAM_SUCCESS)
87 return (pam_err);
88
89 pam_err = pam_get_item(pamh, PAM_TTY, &tty);
90 if (pam_err != PAM_SUCCESS)
91 return (pam_err);
92
93 gethostname(hostname, sizeof hostname);
94 login_access_opts.defgroup = openpam_get_option(pamh, OPT_NODEFGROUP) == NULL ? true : false;
95 login_access_opts.audit = openpam_get_option(pamh, OPT_NOAUDIT) == NULL ? true : false;
96 if ((login_access_opts.accessfile = openpam_get_option(pamh, OPT_ACCESSFILE)) == NULL)
97 login_access_opts.accessfile = _PATH_LOGACCESS;
98 if ((login_access_opts.fieldsep = openpam_get_option(pamh, OPT_FIELDSEP)) == NULL)
99 login_access_opts.fieldsep = _FIELD_SEPARATOR;
100 if ((login_access_opts.listsep = openpam_get_option(pamh, OPT_LISTSEP)) == NULL)
101 login_access_opts.listsep = _LIST_SEPARATOR;
102
103 if (rhost != NULL && *(const char *)rhost != '\0') {
104 PAM_LOG("Checking login.access for user %s from host %s",
105 (const char *)user, (const char *)rhost);
106 if (login_access(user, rhost, &login_access_opts) != 0)
107 return (PAM_SUCCESS);
108 PAM_VERBOSE_ERROR("%s is not allowed to log in from %s",
109 (const char *)user, (const char *)rhost);
110 } else if (tty != NULL && *(const char *)tty != '\0') {
111 PAM_LOG("Checking login.access for user %s on tty %s",
112 (const char *)user, (const char *)tty);
113 if (login_access(user, tty, &login_access_opts) != 0)
114 return (PAM_SUCCESS);
115 PAM_VERBOSE_ERROR("%s is not allowed to log in on %s",
116 (const char *)user, (const char *)tty);
117 } else {
118 PAM_LOG("Checking login.access for user %s",
119 (const char *)user);
120 if (login_access(user, "***unknown***", &login_access_opts) != 0)
121 return (PAM_SUCCESS);
122 PAM_VERBOSE_ERROR("%s is not allowed to log in",
123 (const char *)user);
124 }
125
126 return (PAM_AUTH_ERR);
127 }
128
129 PAM_MODULE_ENTRY("pam_login_access");
130