summaryrefslogtreecommitdiff
path: root/source4/dsdb/samdb/ldb_modules/samba_dsdb.c
blob: da2048766df5ede26ce9ebee35c507dad95294d8 (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
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
/*
   Samba4 module loading module

   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009

   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: Samba4 module loading module
 *
 *  Description: Implement a single 'module' in the ldb database,
 *  which loads the remaining modules based on 'choice of configuration' attributes
 *
 *  This is to avoid forcing a reprovision of the ldb databases when we change the internal structure of the code
 *
 *  Author: Andrew Bartlett
 */

#include "includes.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/ldb/include/ldb_module.h"
#include "lib/ldb/include/ldb_private.h"

#include "dsdb/samdb/ldb_modules/util.h"
#include "dsdb/samdb/samdb.h"
#include "librpc/ndr/libndr.h"

static int read_at_rootdse_record(struct ldb_context *ldb, struct ldb_module *module, TALLOC_CTX *mem_ctx,
				  struct ldb_message **msg)
{
	int ret;
	static const char *rootdse_attrs[] = { "defaultNamingContext", "configurationNamingContext", "schemaNamingContext", NULL };
	struct ldb_result *rootdse_res;
	struct ldb_dn *rootdse_dn;
	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
	if (!tmp_ctx) {
		return ldb_oom(ldb);
	}

	rootdse_dn = ldb_dn_new(tmp_ctx, ldb, "@ROOTDSE");
	if (!rootdse_dn) {
		talloc_free(tmp_ctx);
		return ldb_oom(ldb);
	}

	ret = dsdb_module_search_dn(module, tmp_ctx, &rootdse_res, rootdse_dn,
	                            rootdse_attrs, DSDB_FLAG_NEXT_MODULE);
	if (ret != LDB_SUCCESS) {
		talloc_free(tmp_ctx);
		return ret;
	}

	talloc_steal(mem_ctx, rootdse_res->msgs);
	*msg = rootdse_res->msgs[0];

	talloc_free(tmp_ctx);

	return ret;
}

static int prepare_modules_line(struct ldb_context *ldb,
				TALLOC_CTX *mem_ctx,
				const struct ldb_message *rootdse_msg,
				struct ldb_message *msg, const char *backend_attr,
				const char *backend_mod, const char **backend_mod_list)
{
	int ret;
	const char **backend_full_list;
	const char *backend_dn;
	char *mod_list_string;
	char *full_string;
	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
	if (!tmp_ctx) {
		return ldb_oom(ldb);
	}

	if (backend_attr) {
		backend_dn = ldb_msg_find_attr_as_string(rootdse_msg, backend_attr, NULL);
		if (!backend_dn) {
			ldb_asprintf_errstring(ldb,
					       "samba_dsdb_init: "
					       "unable to read %s from %s:%s",
					       backend_attr, ldb_dn_get_linearized(rootdse_msg->dn),
					       ldb_errstring(ldb));
			return LDB_ERR_CONSTRAINT_VIOLATION;
		}
	} else {
		backend_dn = "*";
	}

	if (backend_mod) {
		backend_full_list = (const char **)str_list_make_single(tmp_ctx, backend_mod);
	} else {
		backend_full_list = (const char **)str_list_make_empty(tmp_ctx);
	}
	if (!backend_full_list) {
		talloc_free(tmp_ctx);
		return ldb_oom(ldb);
	}

	backend_full_list = str_list_append_const(backend_full_list, backend_mod_list);
	if (!backend_full_list) {
		talloc_free(tmp_ctx);
		return ldb_oom(ldb);
	}

	mod_list_string = str_list_join(tmp_ctx, backend_full_list, ',');
	if (!mod_list_string) {
		talloc_free(tmp_ctx);
		return ldb_oom(ldb);
	}

	full_string = talloc_asprintf(tmp_ctx, "%s:%s", backend_dn, mod_list_string);
	ret = ldb_msg_add_steal_string(msg, "modules", full_string);
	talloc_free(tmp_ctx);
	return ret;
}



static int samba_dsdb_init(struct ldb_module *module)
{
	struct ldb_context *ldb = ldb_module_get_ctx(module);
	int ret, len, i;
	TALLOC_CTX *tmp_ctx = talloc_new(module);
	struct ldb_result *res;
	struct ldb_message *rootdse_msg, *partition_msg;
	struct ldb_dn *samba_dsdb_dn;
	struct ldb_module *backend_module, *module_chain;
	const char **final_module_list, **reverse_module_list;
	/*
	  Add modules to the list to activate them by default
	  beware often order is important

	  Some Known ordering constraints:
	  - rootdse must be first, as it makes redirects from "" -> cn=rootdse
	  - extended_dn_in must be before objectclass.c, as it resolves the DN
	  - objectclass must be before password_hash and samldb since these LDB
	    modules require the expanded "objectClass" list
	  - objectclass_attrs must be behind operational in order to see all
	    attributes (the operational module protects and therefore
	    suppresses per default some important ones)
	  - partition must be last
	  - each partition has its own module list then

	  The list is presented here as a set of declarations to show the
	  stack visually - the code below then handles the creation of the list
	  based on the parameters loaded from the database.
	*/
	static const char *modules_list[] = {"resolve_oids",
					     "rootdse",
					     "aclread",
					     "lazy_commit",
					     "paged_results",
					     "ranged_results",
					     "anr",
					     "server_sort",
					     "asq",
					     "extended_dn_store",
					     "extended_dn_in",
					     "objectclass",
					     "descriptor",
					     "acl",
					     "samldb",
					     "password_hash",
					     "operational",
					     "schema_load",
					     "instancetype",
					     "objectclass_attrs",
					     NULL };

	const char **link_modules;
	static const char *fedora_ds_modules[] = {
		"rdn_name", NULL };
	static const char *openldap_modules[] = {
		NULL };
	static const char *tdb_modules_list[] = {
		"rdn_name",
		"subtree_delete",
		"repl_meta_data",
		"subtree_rename",
		"linked_attributes",
		NULL};

	const char *extended_dn_module;
	const char *extended_dn_module_ldb = "extended_dn_out_ldb";
	const char *extended_dn_module_fds = "extended_dn_out_fds";
	const char *extended_dn_module_openldap = "extended_dn_out_openldap";

	static const char *modules_list2[] = {"show_deleted",
					      "new_partition",
					      "partition",
					      NULL };

	const char **backend_modules;
	static const char *fedora_ds_backend_modules[] = {
		"nsuniqueid", "paged_searches", "simple_dn", NULL };
	static const char *openldap_backend_modules[] = {
		"entryuuid", "paged_searches", "simple_dn", NULL };

	static const char *samba_dsdb_attrs[] = { "backendType", "serverRole", NULL };
	const char *backendType, *serverRole;

	if (!tmp_ctx) {
		return ldb_oom(ldb);
	}

	samba_dsdb_dn = ldb_dn_new(tmp_ctx, ldb, "@SAMBA_DSDB");
	if (!samba_dsdb_dn) {
		talloc_free(tmp_ctx);
		return ldb_oom(ldb);
	}

#define CHECK_LDB_RET(check_ret)				\
	do {							\
		if (check_ret != LDB_SUCCESS) {			\
			talloc_free(tmp_ctx);			\
			return check_ret;			\
		}						\
	} while (0)

	ret = dsdb_module_search_dn(module, tmp_ctx, &res, samba_dsdb_dn,
	                            samba_dsdb_attrs, DSDB_FLAG_NEXT_MODULE);
	if (ret == LDB_ERR_NO_SUCH_OBJECT) {
		backendType = "ldb";
		serverRole = "domain controller";
	} else if (ret == LDB_SUCCESS) {
		backendType = ldb_msg_find_attr_as_string(res->msgs[0], "backendType", "ldb");
		serverRole = ldb_msg_find_attr_as_string(res->msgs[0], "serverRole", "domain controller");
	} else {
		talloc_free(tmp_ctx);
		return ret;
	}

	backend_modules = NULL;
	if (strcasecmp(backendType, "ldb") == 0) {
		extended_dn_module = extended_dn_module_ldb;
		link_modules = tdb_modules_list;
	} else {
		if (strcasecmp(backendType, "fedora-ds") == 0) {
			link_modules = fedora_ds_modules;
			backend_modules = fedora_ds_backend_modules;
			extended_dn_module = extended_dn_module_fds;
		} else if (strcasecmp(backendType, "openldap") == 0) {
			link_modules = openldap_modules;
			backend_modules = openldap_backend_modules;
			extended_dn_module = extended_dn_module_openldap;
		} else {
			return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR, "invalid backend type");
		}
		ret = ldb_set_opaque(ldb, "readOnlySchema", (void*)1);
		if (ret != LDB_SUCCESS) {
			ldb_set_errstring(ldb, "Failed to set readOnlySchema opaque");
		}
	}

#define CHECK_MODULE_LIST \
	do {							\
		if (!final_module_list) {			\
			talloc_free(tmp_ctx);			\
			return ldb_oom(ldb);			\
		}						\
	} while (0)

	final_module_list = str_list_copy_const(tmp_ctx, modules_list);
	CHECK_MODULE_LIST;

	final_module_list = str_list_append_const(final_module_list, link_modules);
	CHECK_MODULE_LIST;

	final_module_list = str_list_add_const(final_module_list, extended_dn_module);
	CHECK_MODULE_LIST;

	final_module_list = str_list_append_const(final_module_list, modules_list2);
	CHECK_MODULE_LIST;


	ret = read_at_rootdse_record(ldb, module, tmp_ctx, &rootdse_msg);
	CHECK_LDB_RET(ret);

	partition_msg = ldb_msg_new(tmp_ctx);
	partition_msg->dn = ldb_dn_new(partition_msg, ldb, "@" DSDB_OPAQUE_PARTITION_MODULE_MSG_OPAQUE_NAME);

	ret = prepare_modules_line(ldb, tmp_ctx,
				   rootdse_msg,
				   partition_msg, "defaultNamingContext",
				   "pdc_fsmo", backend_modules);
	CHECK_LDB_RET(ret);

	ret = prepare_modules_line(ldb, tmp_ctx,
				   rootdse_msg,
				   partition_msg, "configurationNamingContext",
				   "naming_fsmo", backend_modules);
	CHECK_LDB_RET(ret);

	ret = prepare_modules_line(ldb, tmp_ctx,
				   rootdse_msg,
				   partition_msg, "schemaNamingContext",
				   "schema_data", backend_modules);
	CHECK_LDB_RET(ret);

	ret = prepare_modules_line(ldb, tmp_ctx,
				   rootdse_msg,
				   partition_msg, NULL,
				   NULL, backend_modules);
	CHECK_LDB_RET(ret);

	ret = ldb_set_opaque(ldb, DSDB_OPAQUE_PARTITION_MODULE_MSG_OPAQUE_NAME, partition_msg);
	CHECK_LDB_RET(ret);

	talloc_steal(ldb, partition_msg);

	/* Now prepare the module chain.  Oddly, we must give it to ldb_load_modules_list in REVERSE */
	for (len = 0; final_module_list[len]; len++) { /* noop */};

	reverse_module_list = talloc_array(tmp_ctx, const char *, len+1);
	if (!reverse_module_list) {
		talloc_free(tmp_ctx);
		return ldb_oom(ldb);
	}
	for (i=0; i < len; i++) {
		reverse_module_list[i] = final_module_list[(len - 1) - i];
	}
	reverse_module_list[i] = NULL;

	/* The backend (at least until the partitions module
	 * reconfigures things) is the next module in the currently
	 * loaded chain */
	backend_module = module->next;
	ret = ldb_load_modules_list(ldb, reverse_module_list, backend_module, &module_chain);
	CHECK_LDB_RET(ret);

	talloc_free(tmp_ctx);
	/* Set this as the 'next' module, so that we effectivly append it to module chain */
	module->next = module_chain;

	return ldb_next_init(module);
}

static const struct ldb_module_ops ldb_samba_dsdb_module_ops = {
	.name		   = "samba_dsdb",
	.init_context	   = samba_dsdb_init,
};

int ldb_samba_dsdb_module_init(const char *version)
{
	LDB_MODULE_CHECK_VERSION(version);
	return ldb_register_module(&ldb_samba_dsdb_module_ops);
}