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
|
/*
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2014 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <nss.h>
#include <sys/types.h>
#include <pwd.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <krb5/localauth_plugin.h>
enum nss_status _nss_sss_getpwnam_r(const char *name, struct passwd *result,
char *buffer, size_t buflen, int *errnop);
#define DEFAULT_BUFSIZE 4096
static krb5_error_code sss_userok(krb5_context context,
krb5_localauth_moddata data,
krb5_const_principal aname,
const char *lname)
{
krb5_error_code kerr;
char *princ_str;
struct passwd pwd = { 0 };
char *buffer = NULL;
size_t buflen;
enum nss_status nss_status;
int nss_errno;
uid_t princ_uid;
int ret;
struct passwd *result = NULL;
kerr = krb5_unparse_name(context, aname, &princ_str);
if (kerr != 0) {
ret = kerr;
goto done;
}
if (strcasecmp(princ_str, lname) == 0) {
ret = 0;
goto done;
}
buflen = DEFAULT_BUFSIZE;
buffer = malloc(buflen);
if (buffer == NULL) {
ret = ENOMEM;
goto done;
}
nss_status = _nss_sss_getpwnam_r(princ_str, &pwd, buffer, buflen,
&nss_errno);
if (nss_status != NSS_STATUS_SUCCESS) {
if (nss_status == NSS_STATUS_NOTFOUND) {
ret = KRB5_PLUGIN_NO_HANDLE;
} else {
ret = EIO;
}
goto done;
}
princ_uid = pwd.pw_uid;
ret = getpwnam_r(lname, &pwd, buffer, buflen, &result);
if (ret != 0 || result == NULL) {
if (result == NULL) {
ret = KRB5_PLUGIN_NO_HANDLE;
} else {
ret = EIO;
}
goto done;
}
if (princ_uid != pwd.pw_uid) {
ret = EPERM;
goto done;
}
ret = 0;
done:
krb5_free_unparsed_name(context, princ_str);
free(buffer);
if (ret != 0) {
return KRB5_PLUGIN_NO_HANDLE;
}
return ret;
}
static krb5_error_code sss_an2ln(krb5_context context,
krb5_localauth_moddata data,
const char *type, const char *residual,
krb5_const_principal aname, char **lname_out)
{
krb5_error_code kerr;
char *princ_str;
struct passwd pwd = { 0 };
char *buffer = NULL;
size_t buflen;
enum nss_status nss_status;
int nss_errno;
int ret;
char *str;
kerr = krb5_unparse_name(context, aname, &princ_str);
if (kerr != 0) {
return kerr;
}
buflen = DEFAULT_BUFSIZE;
buffer = malloc(buflen);
if (buffer == NULL) {
ret = ENOMEM;
goto done;
}
nss_status = _nss_sss_getpwnam_r(princ_str, &pwd, buffer, buflen,
&nss_errno);
if (nss_status != NSS_STATUS_SUCCESS) {
if (nss_status == NSS_STATUS_NOTFOUND) {
ret = KRB5_LNAME_NOTRANS;
} else {
ret = EIO;
}
goto done;
}
if (pwd.pw_name == NULL) {
ret = EINVAL;
goto done;
}
str = strdup(pwd.pw_name);
if (str == NULL) {
ret = ENOMEM;
goto done;
}
*lname_out = str;
ret = 0;
done:
krb5_free_unparsed_name(context, princ_str);
free(buffer);
return ret;
}
static void sss_freestr(krb5_context context,
krb5_localauth_moddata data, char *str)
{
free(str);
}
krb5_error_code
localauth_sssd_initvt(krb5_context context, int maj_ver, int min_ver,
krb5_plugin_vtable vtable)
{
if (maj_ver != 1 || min_ver != 1) {
return KRB5_PLUGIN_VER_NOTSUPP;
}
krb5_localauth_vtable vt = (krb5_localauth_vtable)vtable;
vt->init = NULL;
vt->fini = NULL;
vt->name = "sssd";
vt->an2ln = sss_an2ln;
vt->userok = sss_userok;
vt->free_string = sss_freestr;
return 0;
}
|
