summaryrefslogtreecommitdiff
path: root/source4/dsdb/samdb/ldb_modules/rootdse.c
blob: 86e97f9cfb5fa0a91bfe12227657f1d711eef00f (plain)
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
/* 
   Unix SMB/CIFS implementation.

   rootDSE ldb module

   Copyright (C) Andrew Tridgell 2005
   Copyright (C) Simo Sorce 2005
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/ldb/include/ldb_private.h"
#include "system/time.h"

struct private_data {
	int num_controls;
	char **controls;
	int num_partitions;
	struct ldb_dn **partitions;
};

/*
  return 1 if a specific attribute has been requested
*/
static int do_attribute(const char * const *attrs, const char *name)
{
	return attrs == NULL ||
		ldb_attr_in_list(attrs, name) ||
		ldb_attr_in_list(attrs, "*");
}


/*
  add dynamically generated attributes to rootDSE result
*/
static int rootdse_add_dynamic(struct ldb_module *module, struct ldb_message *msg, const char * const *attrs)
{
	struct private_data *priv = talloc_get_type(module->private_data, struct private_data);
	char **server_sasl;

	msg->dn = ldb_dn_new(msg, module->ldb, NULL);

	/* don't return the distinduishedName, cn and name attributes */
	ldb_msg_remove_attr(msg, "distinguishedName");
	ldb_msg_remove_attr(msg, "cn");
	ldb_msg_remove_attr(msg, "name");

	if (do_attribute(attrs, "currentTime")) {
		if (ldb_msg_add_steal_string(msg, "currentTime", 
					     ldb_timestring(msg, time(NULL))) != 0) {
			goto failed;
		}
	}

	if (do_attribute(attrs, "supportedControl")) {
 		int i;
		for (i = 0; i < priv->num_controls; i++) {
			char *control = talloc_strdup(msg, priv->controls[i]);
			if (!control) {
				goto failed;
			}
			if (ldb_msg_add_steal_string(msg, "supportedControl",
						     control) != 0) {
				goto failed;
 			}
 		}
 	}

	if (do_attribute(attrs, "namingContexts")) {
		int i;
		for (i = 0; i < priv->num_partitions; i++) {
			struct ldb_dn *dn = priv->partitions[i];
			if (ldb_msg_add_steal_string(msg, "namingContexts",
						     ldb_dn_alloc_linearized(msg, dn)) != 0) {
				goto failed;
 			}
 		}
	}

	server_sasl = talloc_get_type(ldb_get_opaque(module->ldb, "supportedSASLMechanims"), 
				       char *);
	if (server_sasl && do_attribute(attrs, "supportedSASLMechanisms")) {
		int i;
		for (i = 0; server_sasl && server_sasl[i]; i++) {
			char *sasl_name = talloc_strdup(msg, server_sasl[i]);
			if (!sasl_name) {
				goto failed;
			}
			if (ldb_msg_add_steal_string(msg, "supportedSASLMechanisms",
						     sasl_name) != 0) {
				goto failed;
			}
		}
	}

	if (do_attribute(attrs, "highestCommittedUSN")) {
		uint64_t seq_num;
		int ret = ldb_sequence_number(module->ldb, LDB_SEQ_HIGHEST_SEQ, &seq_num);
		if (ret == LDB_SUCCESS) {
			if (ldb_msg_add_fmt(msg, "highestCommittedUSN", 
					    "%llu", (unsigned long long)seq_num) != 0) {
				goto failed;
			}
		}
	}

	/* TODO: lots more dynamic attributes should be added here */

	return LDB_SUCCESS;

failed:
	return LDB_ERR_OPERATIONS_ERROR;
}

/*
  handle search requests
*/

struct rootdse_context {
	struct ldb_module *module;
	void *up_context;
	int (*up_callback)(struct ldb_context *, void *, struct ldb_reply *);

	const char * const * attrs;
};

static int rootdse_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
{
	struct rootdse_context *ac;

	if (!context || !ares) {
		ldb_set_errstring(ldb, "NULL Context or Result in callback");
		goto error;
	}

	ac = talloc_get_type(context, struct rootdse_context);

	if (ares->type == LDB_REPLY_ENTRY) {
		/*
		 * if the client explicit asks for the 'netlogon' attribute
		 * the reply_entry needs to be skipped
		 */
		if (ac->attrs && ldb_attr_in_list(ac->attrs, "netlogon")) {
			talloc_free(ares);
			return LDB_SUCCESS;
		}

		/* for each record returned post-process to add any dynamic
		   attributes that have been asked for */
		if (rootdse_add_dynamic(ac->module, ares->message, ac->attrs) != LDB_SUCCESS) {
			goto error;
		}
	}

	return ac->up_callback(ldb, ac->up_context, ares);

error:
	talloc_free(ares);
	return LDB_ERR_OPERATIONS_ERROR;
}

static int rootdse_search(struct ldb_module *module, struct ldb_request *req)
{
	struct rootdse_context *ac;
	struct ldb_request *down_req;
	int ret;

	/* see if its for the rootDSE */
	if (req->op.search.scope != LDB_SCOPE_BASE ||
	    ( ! ldb_dn_is_null(req->op.search.base))) {
		return ldb_next_request(module, req);
	}

	ac = talloc(req, struct rootdse_context);
	if (ac == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ac->module = module;
	ac->up_context = req->context;
	ac->up_callback = req->callback;
	ac->attrs = req->op.search.attrs;

	down_req = talloc_zero(req, struct ldb_request);
	if (down_req == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	down_req->operation = req->operation;
	/* in our db we store the rootDSE with a DN of cn=rootDSE */
	down_req->op.search.base = ldb_dn_new(down_req, module->ldb, "cn=rootDSE");
	down_req->op.search.scope = LDB_SCOPE_BASE;
	down_req->op.search.tree = ldb_parse_tree(down_req, NULL);
	if (down_req->op.search.base == NULL || down_req->op.search.tree == NULL) {
		ldb_oom(module->ldb);
		talloc_free(down_req);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	down_req->op.search.attrs = req->op.search.attrs;
	down_req->controls = req->controls;

	down_req->context = ac;
	down_req->callback = rootdse_callback;
	ldb_set_timeout_from_prev_req(module->ldb, req, down_req);

	/* perform the search */
	ret = ldb_next_request(module, down_req);

	/* do not free down_req as the call results may be linked to it,
	 * it will be freed when the upper level request get freed */
	if (ret == LDB_SUCCESS) {
		req->handle = down_req->handle;
	}

	return ret;
}

static int rootdse_register_control(struct ldb_module *module, struct ldb_request *req)
{
	struct private_data *priv = talloc_get_type(module->private_data, struct private_data);
	char **list;

	list = talloc_realloc(priv, priv->controls, char *, priv->num_controls + 1);
	if (!list) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	list[priv->num_controls] = talloc_strdup(list, req->op.reg_control.oid);
	if (!list[priv->num_controls]) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	priv->num_controls += 1;
	priv->controls = list;

	return LDB_SUCCESS;
}
 
static int rootdse_register_partition(struct ldb_module *module, struct ldb_request *req)
{
	struct private_data *priv = talloc_get_type(module->private_data, struct private_data);
	struct ldb_dn **list;

	list = talloc_realloc(priv, priv->partitions, struct ldb_dn *, priv->num_partitions + 1);
	if (!list) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	list[priv->num_partitions] = ldb_dn_copy(list, req->op.reg_partition.dn);
	if (!list[priv->num_partitions]) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	priv->num_partitions += 1;
	priv->partitions = list;

	return LDB_SUCCESS;
}
 

static int rootdse_request(struct ldb_module *module, struct ldb_request *req)
{
	switch (req->operation) {

	case LDB_REQ_REGISTER_CONTROL:
		return rootdse_register_control(module, req);
	case LDB_REQ_REGISTER_PARTITION:
		return rootdse_register_partition(module, req);

	default:
		break;
	}
	return ldb_next_request(module, req);
}

static int rootdse_init(struct ldb_module *module)
{
	struct private_data *data;

	data = talloc(module, struct private_data);
	if (data == NULL) {
		return -1;
	}

	data->num_controls = 0;
	data->controls = NULL;
	data->num_partitions = 0;
	data->partitions = NULL;
	module->private_data = data;

	return ldb_next_init(module);
}

static const struct ldb_module_ops rootdse_ops = {
	.name			= "rootdse",
	.init_context           = rootdse_init,
	.search                 = rootdse_search,
	.request		= rootdse_request
};

int rootdse_module_init(void)
{
	return ldb_register_module(&rootdse_ops);
}