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
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
|
/*
ldb database library
Copyright (C) Simo Sorce 2005-2008
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007-2008
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 extended dn control module
*
* Description: this module interprets DNs of the form <SID=S-1-2-4456> into normal DNs.
*
* Authors: Simo Sorce
* Andrew Bartlett
*/
#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_errors.h"
#include "ldb/include/ldb_module.h"
/*
TODO: if relax is not set then we need to reject the fancy RMD_* and
DELETED extended DN codes
*/
/* search */
struct extended_search_context {
struct ldb_module *module;
struct ldb_request *req;
struct ldb_dn *basedn;
char *wellknown_object;
int extended_type;
};
/* An extra layer of indirection because LDB does not allow the original request to be altered */
static int extended_final_callback(struct ldb_request *req, struct ldb_reply *ares)
{
int ret = LDB_ERR_OPERATIONS_ERROR;
struct extended_search_context *ac;
ac = talloc_get_type(req->context, struct extended_search_context);
if (ares->error != LDB_SUCCESS) {
ret = ldb_module_done(ac->req, ares->controls,
ares->response, ares->error);
} else {
switch (ares->type) {
case LDB_REPLY_ENTRY:
ret = ldb_module_send_entry(ac->req, ares->message, ares->controls);
break;
case LDB_REPLY_REFERRAL:
ret = ldb_module_send_referral(ac->req, ares->referral);
break;
case LDB_REPLY_DONE:
ret = ldb_module_done(ac->req, ares->controls,
ares->response, ares->error);
break;
}
}
return ret;
}
static int extended_base_callback(struct ldb_request *req, struct ldb_reply *ares)
{
struct extended_search_context *ac;
struct ldb_request *down_req;
struct ldb_message_element *el;
int ret;
size_t i;
size_t wkn_len = 0;
char *valstr = NULL;
const char *found = NULL;
ac = talloc_get_type(req->context, struct extended_search_context);
if (!ares) {
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
if (ares->error != LDB_SUCCESS) {
return ldb_module_done(ac->req, ares->controls,
ares->response, ares->error);
}
switch (ares->type) {
case LDB_REPLY_ENTRY:
if (!ac->wellknown_object) {
ac->basedn = talloc_steal(ac, ares->message->dn);
break;
}
wkn_len = strlen(ac->wellknown_object);
el = ldb_msg_find_element(ares->message, "wellKnownObjects");
if (!el) {
ac->basedn = NULL;
break;
}
for (i=0; i < el->num_values; i++) {
valstr = talloc_strndup(ac,
(const char *)el->values[i].data,
el->values[i].length);
if (!valstr) {
ldb_oom(ldb_module_get_ctx(ac->module));
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
if (strncasecmp(valstr, ac->wellknown_object, wkn_len) != 0) {
talloc_free(valstr);
continue;
}
found = &valstr[wkn_len];
break;
}
if (!found) {
break;
}
ac->basedn = ldb_dn_new(ac, ldb_module_get_ctx(ac->module), found);
talloc_free(valstr);
if (!ac->basedn) {
ldb_oom(ldb_module_get_ctx(ac->module));
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
break;
case LDB_REPLY_REFERRAL:
break;
case LDB_REPLY_DONE:
if (!ac->basedn) {
const char *str = talloc_asprintf(req, "Base-DN '%s' not found",
ldb_dn_get_extended_linearized(req, ac->req->op.search.base, 1));
ldb_set_errstring(ldb_module_get_ctx(ac->module), str);
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_NO_SUCH_OBJECT);
}
switch (ac->req->operation) {
case LDB_SEARCH:
ret = ldb_build_search_req_ex(&down_req,
ldb_module_get_ctx(ac->module), ac->req,
ac->basedn,
ac->req->op.search.scope,
ac->req->op.search.tree,
ac->req->op.search.attrs,
ac->req->controls,
ac, extended_final_callback,
ac->req);
break;
case LDB_ADD:
{
struct ldb_message *add_msg = ldb_msg_copy_shallow(ac, ac->req->op.add.message);
if (!add_msg) {
ldb_oom(ldb_module_get_ctx(ac->module));
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
add_msg->dn = ac->basedn;
ret = ldb_build_add_req(&down_req,
ldb_module_get_ctx(ac->module), ac->req,
add_msg,
ac->req->controls,
ac, extended_final_callback,
ac->req);
break;
}
case LDB_MODIFY:
{
struct ldb_message *mod_msg = ldb_msg_copy_shallow(ac, ac->req->op.mod.message);
if (!mod_msg) {
ldb_oom(ldb_module_get_ctx(ac->module));
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
mod_msg->dn = ac->basedn;
ret = ldb_build_mod_req(&down_req,
ldb_module_get_ctx(ac->module), ac->req,
mod_msg,
ac->req->controls,
ac, extended_final_callback,
ac->req);
break;
}
case LDB_DELETE:
ret = ldb_build_del_req(&down_req,
ldb_module_get_ctx(ac->module), ac->req,
ac->basedn,
ac->req->controls,
ac, extended_final_callback,
ac->req);
break;
case LDB_RENAME:
ret = ldb_build_rename_req(&down_req,
ldb_module_get_ctx(ac->module), ac->req,
ac->basedn,
ac->req->op.rename.newdn,
ac->req->controls,
ac, extended_final_callback,
ac->req);
break;
default:
return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
}
if (ret != LDB_SUCCESS) {
return ldb_module_done(ac->req, NULL, NULL, ret);
}
return ldb_next_request(ac->module, down_req);
}
talloc_free(ares);
return LDB_SUCCESS;
}
static int extended_dn_in_fix(struct ldb_module *module, struct ldb_request *req, struct ldb_dn *dn)
{
struct extended_search_context *ac;
struct ldb_request *down_req;
int ret;
struct ldb_dn *base_dn = NULL;
enum ldb_scope base_dn_scope = LDB_SCOPE_BASE;
const char *base_dn_filter = NULL;
const char * const *base_dn_attrs = NULL;
char *wellknown_object = NULL;
static const char *no_attr[] = {
NULL
};
static const char *wkattr[] = {
"wellKnownObjects",
NULL
};
bool all_partitions = false;
if (!ldb_dn_has_extended(dn)) {
/* Move along there isn't anything to see here */
return ldb_next_request(module, req);
} else {
/* It looks like we need to map the DN */
const struct ldb_val *sid_val, *guid_val, *wkguid_val;
sid_val = ldb_dn_get_extended_component(dn, "SID");
guid_val = ldb_dn_get_extended_component(dn, "GUID");
wkguid_val = ldb_dn_get_extended_component(dn, "WKGUID");
if (sid_val) {
all_partitions = true;
base_dn = ldb_get_default_basedn(ldb_module_get_ctx(module));
base_dn_filter = talloc_asprintf(req, "(objectSid=%s)",
ldb_binary_encode(req, *sid_val));
if (!base_dn_filter) {
return ldb_oom(ldb_module_get_ctx(module));
}
base_dn_scope = LDB_SCOPE_SUBTREE;
base_dn_attrs = no_attr;
} else if (guid_val) {
all_partitions = true;
base_dn = ldb_get_default_basedn(ldb_module_get_ctx(module));
base_dn_filter = talloc_asprintf(req, "(objectGUID=%s)",
ldb_binary_encode(req, *guid_val));
if (!base_dn_filter) {
return ldb_oom(ldb_module_get_ctx(module));
}
base_dn_scope = LDB_SCOPE_SUBTREE;
base_dn_attrs = no_attr;
} else if (wkguid_val) {
char *wkguid_dup;
char *tail_str;
char *p;
wkguid_dup = talloc_strndup(req, (char *)wkguid_val->data, wkguid_val->length);
p = strchr(wkguid_dup, ',');
if (!p) {
return LDB_ERR_INVALID_DN_SYNTAX;
}
p[0] = '\0';
p++;
wellknown_object = talloc_asprintf(req, "B:32:%s:", wkguid_dup);
if (!wellknown_object) {
return ldb_oom(ldb_module_get_ctx(module));
}
tail_str = p;
base_dn = ldb_dn_new(req, ldb_module_get_ctx(module), tail_str);
talloc_free(wkguid_dup);
if (!base_dn) {
return ldb_oom(ldb_module_get_ctx(module));
}
base_dn_filter = talloc_strdup(req, "(objectClass=*)");
if (!base_dn_filter) {
return ldb_oom(ldb_module_get_ctx(module));
}
base_dn_scope = LDB_SCOPE_BASE;
base_dn_attrs = wkattr;
} else {
return LDB_ERR_INVALID_DN_SYNTAX;
}
ac = talloc_zero(req, struct extended_search_context);
if (ac == NULL) {
return ldb_oom(ldb_module_get_ctx(module));
}
ac->module = module;
ac->req = req;
ac->basedn = NULL; /* Filled in if the search finds the DN by SID/GUID etc */
ac->wellknown_object = wellknown_object;
/* If the base DN was an extended DN (perhaps a well known
* GUID) then search for that, so we can proceed with the original operation */
ret = ldb_build_search_req(&down_req,
ldb_module_get_ctx(module), ac,
base_dn,
base_dn_scope,
base_dn_filter,
base_dn_attrs,
NULL,
ac, extended_base_callback,
req);
if (ret != LDB_SUCCESS) {
return ldb_operr(ldb_module_get_ctx(module));
}
if (all_partitions) {
struct ldb_search_options_control *control;
control = talloc(down_req, struct ldb_search_options_control);
control->search_options = 2;
ret = ldb_request_add_control(down_req,
LDB_CONTROL_SEARCH_OPTIONS_OID,
true, control);
if (ret != LDB_SUCCESS) {
ldb_oom(ldb_module_get_ctx(module));
return ret;
}
}
/* perform the search */
return ldb_next_request(module, down_req);
}
}
static int extended_dn_in_search(struct ldb_module *module, struct ldb_request *req)
{
return extended_dn_in_fix(module, req, req->op.search.base);
}
static int extended_dn_in_modify(struct ldb_module *module, struct ldb_request *req)
{
return extended_dn_in_fix(module, req, req->op.mod.message->dn);
}
static int extended_dn_in_del(struct ldb_module *module, struct ldb_request *req)
{
return extended_dn_in_fix(module, req, req->op.del.dn);
}
static int extended_dn_in_rename(struct ldb_module *module, struct ldb_request *req)
{
return extended_dn_in_fix(module, req, req->op.rename.olddn);
}
_PUBLIC_ const struct ldb_module_ops ldb_extended_dn_in_module_ops = {
.name = "extended_dn_in",
.search = extended_dn_in_search,
.modify = extended_dn_in_modify,
.del = extended_dn_in_del,
.rename = extended_dn_in_rename,
};
|