1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*-
* Copyright (c) 2003 Networks Associates Technology, Inc.
* Copyright (c) 2004-2011 Dag-Erling Smørgrav
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
* ThinkSec AS and NAI Labs, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <grp.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/openpam.h>
static int
pam_group(pam_handle_t *pamh)
{
int local, remote;
const char *group, *user;
const void *ruser;
char *const *list;
struct passwd *pwd;
struct group *grp;
/* get target account */
if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS ||
user == NULL || (pwd = getpwnam(user)) == NULL)
return (PAM_AUTH_ERR);
if (pwd->pw_uid != 0 && openpam_get_option(pamh, "root_only"))
return (PAM_IGNORE);
/* check local / remote */
local = openpam_get_option(pamh, "luser") ? 1 : 0;
remote = openpam_get_option(pamh, "ruser") ? 1 : 0;
if (local && remote) {
openpam_log(PAM_LOG_ERROR, "(pam_group) "
"the luser and ruser options are mutually exclusive");
return (PAM_SERVICE_ERR);
} else if (local) {
/* we already have the correct struct passwd */
} else {
if (!remote)
openpam_log(PAM_LOG_NOTICE, "(pam_group) "
"neither luser nor ruser specified, assuming ruser");
/* default / historical behavior */
if (pam_get_item(pamh, PAM_RUSER, &ruser) != PAM_SUCCESS ||
ruser == NULL || (pwd = getpwnam(ruser)) == NULL)
return (PAM_AUTH_ERR);
}
/* get regulating group */
if ((group = openpam_get_option(pamh, "group")) == NULL)
group = "wheel";
if ((grp = getgrnam(group)) == NULL || grp->gr_mem == NULL)
goto failed;
/* check if user's own primary group */
if (pwd->pw_gid == grp->gr_gid)
goto found;
/* iterate over members */
for (list = grp->gr_mem; list != NULL && *list != NULL; ++list)
if (strcmp(*list, pwd->pw_name) == 0)
goto found;
not_found:
if (openpam_get_option(pamh, "deny"))
return (PAM_SUCCESS);
return (PAM_AUTH_ERR);
found:
if (openpam_get_option(pamh, "deny"))
return (PAM_AUTH_ERR);
return (PAM_SUCCESS);
failed:
if (openpam_get_option(pamh, "fail_safe"))
goto found;
else
goto not_found;
}
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
return (pam_group(pamh));
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
return (PAM_SUCCESS);
}
PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
return (pam_group(pamh));
}
PAM_MODULE_ENTRY("pam_group");
|
