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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
ldb database library
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007
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/>.
*/
/*
* Name: ldb
*
* Component: ldb update_keytabs module
*
* Description: Update keytabs whenever their matching secret record changes
*
* Author: Andrew Bartlett
*/
#include "includes.h"
#include "ldb/include/ldb_includes.h"
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_krb5.h"
#include "system/kerberos.h"
#include "param/param.h"
struct dn_list {
struct cli_credentials *creds;
struct dn_list *prev, *next;
};
struct update_kt_private {
struct dn_list *changed_dns;
};
static int add_modified(struct ldb_module *module, struct ldb_dn *dn, bool delete) {
struct update_kt_private *data = talloc_get_type(module->private_data, struct update_kt_private);
struct dn_list *item;
char *filter;
struct ldb_result *res;
const char *attrs[] = { NULL };
int ret;
NTSTATUS status;
filter = talloc_asprintf(data, "(&(dn=%s)(&(objectClass=kerberosSecret)(privateKeytab=*)))",
ldb_dn_get_linearized(dn));
if (!filter) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
ret = ldb_search(module->ldb, dn, LDB_SCOPE_BASE,
filter, attrs, &res);
if (ret != LDB_SUCCESS) {
talloc_free(filter);
return ret;
}
if (res->count != 1) {
/* if it's not a kerberosSecret then we don't have anything to update */
talloc_free(res);
talloc_free(filter);
return LDB_SUCCESS;
}
talloc_free(res);
item = talloc(data->changed_dns? (void *)data->changed_dns: (void *)data, struct dn_list);
if (!item) {
talloc_free(filter);
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
item->creds = cli_credentials_init(item);
if (!item->creds) {
DEBUG(1, ("cli_credentials_init failed!"));
talloc_free(filter);
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
cli_credentials_set_conf(item->creds, global_loadparm);
status = cli_credentials_set_secrets(item->creds, module->ldb, NULL, filter);
talloc_free(filter);
if (NT_STATUS_IS_OK(status)) {
if (delete) {
/* Ensure we don't helpfully keep an old keytab entry */
cli_credentials_set_kvno(item->creds, cli_credentials_get_kvno(item->creds)+2);
/* Wipe passwords */
cli_credentials_set_nt_hash(item->creds, NULL,
CRED_SPECIFIED);
}
DLIST_ADD_END(data->changed_dns, item, struct dn_list *);
}
return LDB_SUCCESS;
}
/* add */
static int update_kt_add(struct ldb_module *module, struct ldb_request *req)
{
int ret;
ret = ldb_next_request(module, req);
if (ret != LDB_SUCCESS) {
return ret;
}
return add_modified(module, req->op.add.message->dn, false);
}
/* modify */
static int update_kt_modify(struct ldb_module *module, struct ldb_request *req)
{
int ret;
ret = ldb_next_request(module, req);
if (ret != LDB_SUCCESS) {
return ret;
}
return add_modified(module, req->op.mod.message->dn, false);
}
/* delete */
static int update_kt_delete(struct ldb_module *module, struct ldb_request *req)
{
int ret;
/* Before we delete it, record the details */
ret = add_modified(module, req->op.del.dn, true);
if (ret != LDB_SUCCESS) {
return ret;
}
return ldb_next_request(module, req);
}
/* rename */
static int update_kt_rename(struct ldb_module *module, struct ldb_request *req)
{
int ret;
ret = ldb_next_request(module, req);
if (ret != LDB_SUCCESS) {
return ret;
}
return add_modified(module, req->op.rename.newdn, false);
}
/* end a transaction */
static int update_kt_end_trans(struct ldb_module *module)
{
struct update_kt_private *data = talloc_get_type(module->private_data, struct update_kt_private);
struct dn_list *p;
for (p=data->changed_dns; p; p = p->next) {
int kret;
kret = cli_credentials_update_keytab(p->creds);
if (kret != 0) {
talloc_free(data->changed_dns);
data->changed_dns = NULL;
ldb_asprintf_errstring(module->ldb, "Failed to update keytab: %s", error_message(kret));
return LDB_ERR_OPERATIONS_ERROR;
}
}
talloc_free(data->changed_dns);
data->changed_dns = NULL;
return ldb_next_end_trans(module);
}
/* end a transaction */
static int update_kt_del_trans(struct ldb_module *module)
{
struct update_kt_private *data = talloc_get_type(module->private_data, struct update_kt_private);
talloc_free(data->changed_dns);
data->changed_dns = NULL;
return ldb_next_del_trans(module);
}
static int update_kt_init(struct ldb_module *module)
{
struct update_kt_private *data;
data = talloc(module, struct update_kt_private);
if (data == NULL) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
module->private_data = data;
data->changed_dns = NULL;
return ldb_next_init(module);
}
static const struct ldb_module_ops update_kt_ops = {
.name = "update_keytab",
.init_context = update_kt_init,
.add = update_kt_add,
.modify = update_kt_modify,
.rename = update_kt_rename,
.del = update_kt_delete,
.end_transaction = update_kt_end_trans,
.del_transaction = update_kt_del_trans,
};
int ldb_update_kt_init(void)
{
return ldb_register_module(&update_kt_ops);
}
|
