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) 2009 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 <stdio.h>
#include <errno.h>
#include <talloc.h>
#include "config.h"
#include "util/util.h"
#include "util/sss_krb5.h"
const char *KRB5_CALLCONV sss_krb5_get_error_message(krb5_context ctx,
krb5_error_code ec)
{
#ifdef HAVE_KRB5_GET_ERROR_MESSAGE
return krb5_get_error_message(ctx, ec);
#else
int ret;
char *s = NULL;
int size = sizeof("Kerberos error [XXXXXXXXXXXX]");
s = malloc(sizeof(char) * (size));
if (s == NULL) {
return NULL;
}
ret = snprintf(s, size, "Kerberos error [%12d]", ec);
if (ret < 0 || ret >= size) {
return NULL;
}
return s;
#endif
}
void KRB5_CALLCONV sss_krb5_free_error_message(krb5_context ctx, const char *s)
{
#ifdef HAVE_KRB5_GET_ERROR_MESSAGE
krb5_free_error_message(ctx, s);
#else
free(s);
#endif
return;
}
krb5_error_code KRB5_CALLCONV sss_krb5_get_init_creds_opt_alloc(
krb5_context context,
krb5_get_init_creds_opt **opt)
{
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
return krb5_get_init_creds_opt_alloc(context, opt);
#else
*opt = calloc(1, sizeof(krb5_get_init_creds_opt));
if (*opt == NULL) {
return ENOMEM;
}
krb5_get_init_creds_opt_init(*opt);
return 0;
#endif
}
void KRB5_CALLCONV sss_krb5_get_init_creds_opt_free (krb5_context context,
krb5_get_init_creds_opt *opt)
{
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
krb5_get_init_creds_opt_free(context, opt);
#else
free(opt);
#endif
return;
}
void KRB5_CALLCONV sss_krb5_free_unparsed_name(krb5_context context, char *name)
{
#ifdef HAVE_KRB5_FREE_UNPARSED_NAME
krb5_free_unparsed_name(context, name);
#else
if (name != NULL) {
memset(name, 0, strlen(name));
free(name);
}
#endif
}
krb5_error_code check_for_valid_tgt(const char *ccname, const char *realm,
const char *client_princ_str, bool *result)
{
krb5_context context = NULL;
krb5_ccache ccache = NULL;
krb5_error_code krberr;
TALLOC_CTX *tmp_ctx = NULL;
krb5_creds mcred;
krb5_creds cred;
char *server_name = NULL;
krb5_principal client_principal = NULL;
krb5_principal server_principal = NULL;
*result = false;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(1, ("talloc_new failed.\n"));
return ENOMEM;
}
krberr = krb5_init_context(&context);
if (krberr) {
DEBUG(1, ("Failed to init kerberos context\n"));
goto done;
}
krberr = krb5_cc_resolve(context, ccname, &ccache);
if (krberr != 0) {
DEBUG(1, ("krb5_cc_resolve failed.\n"));
goto done;
}
server_name = talloc_asprintf(tmp_ctx, "krbtgt/%s@%s", realm, realm);
if (server_name == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
goto done;
}
krberr = krb5_parse_name(context, server_name, &server_principal);
if (krberr != 0) {
DEBUG(1, ("krb5_parse_name failed.\n"));
goto done;
}
krberr = krb5_parse_name(context, client_princ_str, &client_principal);
if (krberr != 0) {
DEBUG(1, ("krb5_parse_name failed.\n"));
goto done;
}
memset(&mcred, 0, sizeof(mcred));
memset(&cred, 0, sizeof(mcred));
mcred.client = client_principal;
mcred.server = server_principal;
krberr = krb5_cc_retrieve_cred(context, ccache, 0, &mcred, &cred);
if (krberr != 0) {
DEBUG(1, ("krb5_cc_retrieve_cred failed.\n"));
krberr = 0;
goto done;
}
DEBUG(7, ("TGT end time [%d].\n", cred.times.endtime));
if (cred.times.endtime > time(NULL)) {
DEBUG(3, ("TGT is valid.\n"));
*result = true;
}
krb5_free_cred_contents(context, &cred);
krberr = 0;
done:
if (client_principal != NULL) {
krb5_free_principal(context, client_principal);
}
if (server_principal != NULL) {
krb5_free_principal(context, server_principal);
}
if (ccache != NULL) {
krb5_cc_close(context, ccache);
}
if (context != NULL) krb5_free_context(context);
talloc_free(tmp_ctx);
return krberr;
}
|
