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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <syslog.h>
#include <pwd.h>
#include <unistd.h>
#include <strings.h>
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <libintl.h>
#include <pwd.h>
#include <user_attr.h>
#include <secdb.h>
#include <nss_dbdefs.h>
#include <security/pam_impl.h>
static int roleinlist();
/*
* pam_sm_acct_mgmt():
* Account management module
* This module disallows roles for primary logins and adds special
* checks to allow roles for secondary logins.
*/
/*ARGSUSED*/
int
pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
uid_t uid;
userattr_t *user_entry;
char *kva_value;
char *username;
char *auser;
char *rhost;
char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE];
struct passwd *pw_entry, pwd;
char buf[NSS_BUFLEN_PASSWD];
int i;
int debug = 0;
int allow_remote = 0;
(void) pam_get_item(pamh, PAM_USER, (void **)&username);
(void) pam_get_item(pamh, PAM_AUSER, (void **)&auser);
(void) pam_get_item(pamh, PAM_RHOST, (void **)&rhost);
for (i = 0; i < argc; i++) {
if (strcmp(argv[i], "allow_remote") == 0) {
allow_remote = 1;
} else if (strcmp(argv[i], "debug") == 0) {
debug = 1;
} else {
__pam_log(LOG_AUTH | LOG_ERR,
"pam_roles:pam_sm_acct_mgmt: illegal module "
"option %s", argv[i]);
}
}
if (debug) {
char *ruser;
char *service;
(void) pam_get_item(pamh, PAM_RUSER, (void **)&ruser);
(void) pam_get_item(pamh, PAM_SERVICE, (void **)&service);
__pam_log(LOG_AUTH | LOG_DEBUG, "pam_roles:pam_sm_acct_mgmt: "
"service = %s, allow_remote = %d, user = %s auser = %s "
"ruser = %s rhost = %s\n", (service) ? service : "not set",
allow_remote, (username) ? username : "not set",
(auser) ? auser: "not set", (ruser) ? ruser: "not set",
(rhost) ? rhost: "not set");
}
if (username == NULL)
return (PAM_USER_UNKNOWN);
/* stop masquerades by mapping username to uid to username */
if ((pw_entry = getpwnam_r(username, &pwd, buf, sizeof (buf))) == NULL)
return (PAM_USER_UNKNOWN);
if ((pw_entry = getpwuid_r(pw_entry->pw_uid, &pwd, buf,
sizeof (buf))) == NULL)
return (PAM_USER_UNKNOWN);
/*
* If there's no user_attr entry for the primary user or it's not a
* role, no further checks are needed.
*/
if (((user_entry = getusernam(pw_entry->pw_name)) == NULL) ||
((kva_value = kva_match((kva_t *)user_entry->attr,
USERATTR_TYPE_KW)) == NULL) ||
((strcmp(kva_value, USERATTR_TYPE_NONADMIN_KW) != 0) &&
(strcmp(kva_value, USERATTR_TYPE_ADMIN_KW) != 0))) {
free_userattr(user_entry);
return (PAM_IGNORE);
}
free_userattr(user_entry);
/* username is a role */
if (strcmp(username, pw_entry->pw_name) != 0) {
__pam_log(LOG_AUTH | LOG_ALERT,
"pam_roles:pam_sm_acct_mgmt: user name %s "
"maps to user id %d which is user name %s",
username, pw_entry->pw_uid, pw_entry->pw_name);
}
/* Who's the user requesting the role? */
if (auser != NULL && *auser != '\0') {
/* authenticated requesting user */
user_entry = getusernam(auser);
} else {
/* user is implied by real UID */
if ((uid = getuid()) == 0) {
/*
* Root user_attr entry cannot have roles.
* Force error and deny access.
*/
user_entry = NULL;
} else {
if ((pw_entry = getpwuid_r(uid, &pwd, buf,
sizeof (buf))) == NULL) {
return (PAM_USER_UNKNOWN);
}
user_entry = getusernam(pw_entry->pw_name);
}
}
if ((rhost != NULL && *rhost != '\0') &&
allow_remote == 0) {
/* don't allow remote roles for this service */
free_userattr(user_entry);
return (PAM_PERM_DENIED);
}
/*
* If the original user does not have a user_attr entry or isn't
* assigned the role being assumed, fail.
*/
if ((user_entry == NULL) ||
((kva_value = kva_match((kva_t *)user_entry->attr,
USERATTR_ROLES_KW)) == NULL) ||
(roleinlist(kva_value, username) == 0)) {
free_userattr(user_entry);
(void) strlcpy(messages[0], dgettext(TEXT_DOMAIN,
"Roles can only be assumed by authorized users"),
sizeof (messages[0]));
(void) __pam_display_msg(pamh, PAM_ERROR_MSG, 1, messages,
NULL);
return (PAM_PERM_DENIED);
}
free_userattr(user_entry);
return (PAM_IGNORE);
}
int
roleinlist(char *list, char *role)
{
char *lasts = (char *)NULL;
char *rolename = (char *)strtok_r(list, ",", &lasts);
while (rolename) {
if (strcmp(rolename, role) == 0)
return (1);
else
rolename = (char *)strtok_r(NULL, ",", &lasts);
}
return (0);
}
|
