Line data Source code
1 : /*
2 : ldb database library
3 :
4 : Copyright (C) Andrew Tridgell 2005
5 :
6 : ** NOTE! The following LGPL license applies to the ldb
7 : ** library. This does NOT imply that all of Samba is released
8 : ** under the LGPL
9 :
10 : This library is free software; you can redistribute it and/or
11 : modify it under the terms of the GNU Lesser General Public
12 : License as published by the Free Software Foundation; either
13 : version 3 of the License, or (at your option) any later version.
14 :
15 : This library is distributed in the hope that it will be useful,
16 : but WITHOUT ANY WARRANTY; without even the implied warranty of
17 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 : Lesser General Public License for more details.
19 :
20 : You should have received a copy of the GNU Lesser General Public
21 : License along with this library; if not, see <http://www.gnu.org/licenses/>.
22 : */
23 : /*
24 : register handlers for specific attributes and objectclass relationships
25 :
26 : this allows a backend to store its schema information in any format
27 : it likes (or to not have any schema information at all) while keeping the
28 : message matching logic generic
29 : */
30 :
31 : #include "ldb_private.h"
32 : #include "ldb_handlers.h"
33 :
34 : /*
35 : fill in an attribute to the ldb_schema into the supplied buffer
36 :
37 : if flags contains LDB_ATTR_FLAG_ALLOCATED
38 : the attribute name string will be copied using
39 : talloc_strdup(), otherwise it needs to be a static const
40 : string at least with a lifetime longer than the ldb struct!
41 :
42 : the ldb_schema_syntax structure should be a pointer
43 : to a static const struct or at least it needs to be
44 : a struct with a longer lifetime than the ldb context!
45 :
46 : */
47 120651380 : int ldb_schema_attribute_fill_with_syntax(struct ldb_context *ldb,
48 : TALLOC_CTX *mem_ctx,
49 : const char *attribute,
50 : unsigned flags,
51 : const struct ldb_schema_syntax *syntax,
52 : struct ldb_schema_attribute *a)
53 : {
54 120651380 : a->name = attribute;
55 120651380 : a->flags = flags;
56 120651380 : a->syntax = syntax;
57 :
58 120651380 : if (a->flags & LDB_ATTR_FLAG_ALLOCATED) {
59 120651284 : a->name = talloc_strdup(mem_ctx, a->name);
60 120651284 : if (a->name == NULL) {
61 0 : ldb_oom(ldb);
62 0 : return -1;
63 : }
64 : }
65 :
66 116302399 : return 0;
67 : }
68 :
69 : /*
70 : add a attribute to the ldb_schema
71 :
72 : if flags contains LDB_ATTR_FLAG_ALLOCATED
73 : the attribute name string will be copied using
74 : talloc_strdup(), otherwise it needs to be a static const
75 : string at least with a lifetime longer than the ldb struct!
76 :
77 : the ldb_schema_syntax structure should be a pointer
78 : to a static const struct or at least it needs to be
79 : a struct with a longer lifetime than the ldb context!
80 :
81 : */
82 48945743 : int ldb_schema_attribute_add_with_syntax(struct ldb_context *ldb,
83 : const char *attribute,
84 : unsigned flags,
85 : const struct ldb_schema_syntax *syntax)
86 : {
87 894273 : unsigned int i, n;
88 894273 : struct ldb_schema_attribute *a;
89 :
90 48945743 : if (!syntax) {
91 0 : return LDB_ERR_OPERATIONS_ERROR;
92 : }
93 :
94 48945743 : n = ldb->schema.num_attributes + 1;
95 :
96 48945743 : a = talloc_realloc(ldb, ldb->schema.attributes,
97 : struct ldb_schema_attribute, n);
98 48945743 : if (a == NULL) {
99 0 : ldb_oom(ldb);
100 0 : return -1;
101 : }
102 48945743 : ldb->schema.attributes = a;
103 :
104 848206184 : for (i = 0; i < ldb->schema.num_attributes; i++) {
105 844481679 : int cmp = ldb_attr_cmp(attribute, a[i].name);
106 844481679 : if (cmp == 0) {
107 : /* silently ignore attempts to overwrite fixed attributes */
108 0 : if (a[i].flags & LDB_ATTR_FLAG_FIXED) {
109 0 : return 0;
110 : }
111 0 : if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
112 0 : talloc_free(discard_const_p(char, a[i].name));
113 : }
114 : /* To cancel out increment below */
115 0 : ldb->schema.num_attributes--;
116 0 : break;
117 844481679 : } else if (cmp < 0) {
118 45221238 : memmove(a+i+1, a+i, sizeof(*a) * (ldb->schema.num_attributes-i));
119 44397922 : break;
120 : }
121 : }
122 48945743 : ldb->schema.num_attributes++;
123 :
124 48945743 : a[i].name = attribute;
125 48945743 : a[i].flags = flags;
126 48945743 : a[i].syntax = syntax;
127 :
128 48945743 : if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
129 0 : a[i].name = talloc_strdup(a, a[i].name);
130 0 : if (a[i].name == NULL) {
131 0 : ldb_oom(ldb);
132 0 : return -1;
133 : }
134 : }
135 :
136 48051470 : return 0;
137 : }
138 :
139 : static const struct ldb_schema_syntax ldb_syntax_default = {
140 : .name = LDB_SYNTAX_OCTET_STRING,
141 : .ldif_read_fn = ldb_handler_copy,
142 : .ldif_write_fn = ldb_handler_copy,
143 : .canonicalise_fn = ldb_handler_copy,
144 : .comparison_fn = ldb_comparison_binary
145 : };
146 :
147 : static const struct ldb_schema_attribute ldb_attribute_default = {
148 : .name = NULL,
149 : .flags = 0,
150 : .syntax = &ldb_syntax_default
151 : };
152 :
153 : /*
154 : * Return the attribute handlers for a given attribute
155 : *
156 : * @param ldb ldb context
157 : * @param name attribute name to search for
158 : * @return Always return valid pointer to schema attribute.
159 : * In case there is no attribute with name,
160 : * ldb_attribute_default is returned
161 : */
162 217252713 : static const struct ldb_schema_attribute *ldb_schema_attribute_by_name_internal(
163 : struct ldb_context *ldb,
164 : const char *name)
165 : {
166 : /* for binary search we need signed variables */
167 217252713 : unsigned int i, e, b = 0;
168 9040923 : int r;
169 217252713 : const struct ldb_schema_attribute *def = &ldb_attribute_default;
170 :
171 : /* fallback to default attribute implementation */
172 217252713 : if (name == NULL) {
173 0 : return def;
174 : }
175 :
176 : /* as handlers are sorted, '*' must be the first if present */
177 217252713 : if (strcmp(ldb->schema.attributes[0].name, "*") == 0) {
178 152 : def = &ldb->schema.attributes[0];
179 152 : b = 1;
180 : }
181 :
182 : /* do a binary search on the array */
183 217252713 : e = ldb->schema.num_attributes - 1;
184 :
185 1340583777 : while ((b <= e) && (e != (unsigned int) -1)) {
186 1204842057 : i = (b + e) / 2;
187 :
188 1204842057 : r = ldb_attr_cmp(name, ldb->schema.attributes[i].name);
189 1204842057 : if (r == 0) {
190 81510993 : return &ldb->schema.attributes[i];
191 : }
192 1123331064 : if (r < 0) {
193 547719922 : e = i - 1;
194 : } else {
195 575611142 : b = i + 1;
196 : }
197 : }
198 :
199 130004480 : return def;
200 : }
201 :
202 : /*
203 : return the attribute handlers for a given attribute
204 : */
205 1256842949 : const struct ldb_schema_attribute *ldb_schema_attribute_by_name(struct ldb_context *ldb,
206 : const char *name)
207 : {
208 1256842949 : if (ldb->schema.attribute_handler_override) {
209 24966888 : const struct ldb_schema_attribute *ret =
210 1043834972 : ldb->schema.attribute_handler_override(ldb,
211 : ldb->schema.attribute_handler_override_private,
212 : name);
213 1043834972 : if (ret) {
214 1014831601 : return ret;
215 : }
216 : }
217 :
218 217252713 : return ldb_schema_attribute_by_name_internal(ldb, name);
219 : }
220 :
221 :
222 : /*
223 : add to the list of ldif handlers for this ldb context
224 : */
225 0 : void ldb_schema_attribute_remove(struct ldb_context *ldb, const char *name)
226 : {
227 0 : const struct ldb_schema_attribute *a;
228 0 : ptrdiff_t i;
229 :
230 0 : a = ldb_schema_attribute_by_name_internal(ldb, name);
231 0 : if (a == NULL || a->name == NULL) {
232 0 : return;
233 : }
234 :
235 : /* FIXED attributes are never removed */
236 0 : if (a->flags & LDB_ATTR_FLAG_FIXED) {
237 0 : return;
238 : }
239 :
240 0 : if (a->flags & LDB_ATTR_FLAG_ALLOCATED) {
241 0 : talloc_free(discard_const_p(char, a->name));
242 : }
243 :
244 0 : i = a - ldb->schema.attributes;
245 0 : if (i < ldb->schema.num_attributes - 1) {
246 0 : memmove(&ldb->schema.attributes[i],
247 0 : a+1, sizeof(*a) * (ldb->schema.num_attributes-(i+1)));
248 : }
249 :
250 0 : ldb->schema.num_attributes--;
251 : }
252 :
253 : /*
254 : remove attributes with a specified flag (eg LDB_ATTR_FLAG_FROM_DB) for this ldb context
255 :
256 : This is to permit correct reloads
257 : */
258 2877160 : void ldb_schema_attribute_remove_flagged(struct ldb_context *ldb, unsigned int flag)
259 : {
260 56914 : ptrdiff_t i;
261 :
262 292353590 : for (i = 0; i < ldb->schema.num_attributes;) {
263 289476430 : const struct ldb_schema_attribute *a
264 289476430 : = &ldb->schema.attributes[i];
265 : /* FIXED attributes are never removed */
266 289476430 : if (a->flags & LDB_ATTR_FLAG_FIXED) {
267 171490380 : i++;
268 171490380 : continue;
269 : }
270 117986050 : if ((a->flags & flag) == 0) {
271 17263264 : i++;
272 17263264 : continue;
273 : }
274 100722786 : if (a->flags & LDB_ATTR_FLAG_ALLOCATED) {
275 100722786 : talloc_free(discard_const_p(char, a->name));
276 : }
277 100722786 : if (i < ldb->schema.num_attributes - 1) {
278 104168154 : memmove(&ldb->schema.attributes[i],
279 100555930 : a+1, sizeof(*a) * (ldb->schema.num_attributes-(i+1)));
280 : }
281 :
282 100722786 : ldb->schema.num_attributes--;
283 : }
284 2877160 : }
285 :
286 : /*
287 : setup a attribute handler using a standard syntax
288 : */
289 4501096 : int ldb_schema_attribute_add(struct ldb_context *ldb,
290 : const char *attribute,
291 : unsigned flags,
292 : const char *syntax)
293 : {
294 4501096 : const struct ldb_schema_syntax *s = ldb_standard_syntax_by_name(ldb, syntax);
295 4501096 : return ldb_schema_attribute_add_with_syntax(ldb, attribute, flags, s);
296 : }
297 :
298 : /*
299 : setup the attribute handles for well known attributes
300 : */
301 746826 : int ldb_setup_wellknown_attributes(struct ldb_context *ldb)
302 : {
303 15452 : const struct {
304 : const char *attr;
305 : const char *syntax;
306 746826 : } wellknown[] = {
307 : { "dn", LDB_SYNTAX_DN },
308 : { "distinguishedName", LDB_SYNTAX_DN },
309 : { "cn", LDB_SYNTAX_DIRECTORY_STRING },
310 : { "dc", LDB_SYNTAX_DIRECTORY_STRING },
311 : { "ou", LDB_SYNTAX_DIRECTORY_STRING },
312 : { "objectClass", LDB_SYNTAX_OBJECTCLASS }
313 : };
314 15452 : unsigned int i;
315 15452 : int ret;
316 :
317 5227782 : for (i=0;i<ARRAY_SIZE(wellknown);i++) {
318 4573668 : ret = ldb_schema_attribute_add(ldb, wellknown[i].attr, 0,
319 4480956 : wellknown[i].syntax);
320 4480956 : if (ret != LDB_SUCCESS) {
321 0 : return ret;
322 : }
323 : }
324 :
325 731374 : return LDB_SUCCESS;
326 : }
327 :
328 :
329 : /*
330 : add a extended dn syntax to the ldb_schema
331 : */
332 7407447 : int ldb_dn_extended_add_syntax(struct ldb_context *ldb,
333 : unsigned flags,
334 : const struct ldb_dn_extended_syntax *syntax)
335 : {
336 133511 : unsigned int n;
337 133511 : struct ldb_dn_extended_syntax *a;
338 :
339 7407447 : if (!syntax) {
340 0 : return LDB_ERR_OPERATIONS_ERROR;
341 : }
342 :
343 7407447 : n = ldb->schema.num_dn_extended_syntax + 1;
344 :
345 7407447 : a = talloc_realloc(ldb, ldb->schema.dn_extended_syntax,
346 : struct ldb_dn_extended_syntax, n);
347 :
348 7407447 : if (!a) {
349 0 : return LDB_ERR_OPERATIONS_ERROR;
350 : }
351 :
352 7407447 : a[ldb->schema.num_dn_extended_syntax] = *syntax;
353 7407447 : ldb->schema.dn_extended_syntax = a;
354 :
355 7407447 : ldb->schema.num_dn_extended_syntax = n;
356 :
357 7407447 : return LDB_SUCCESS;
358 : }
359 :
360 : /*
361 : return the extended dn syntax for a given name
362 : */
363 289254964 : const struct ldb_dn_extended_syntax *ldb_dn_extended_syntax_by_name(struct ldb_context *ldb,
364 : const char *name)
365 : {
366 5559795 : unsigned int i;
367 832750628 : for (i=0; i < ldb->schema.num_dn_extended_syntax; i++) {
368 832750619 : if (ldb_attr_cmp(ldb->schema.dn_extended_syntax[i].name, name) == 0) {
369 289254955 : return &ldb->schema.dn_extended_syntax[i];
370 : }
371 : }
372 0 : return NULL;
373 : }
374 :
375 : /*
376 : set an attribute handler override function - used to delegate schema handling
377 : to external code
378 : */
379 514409 : void ldb_schema_attribute_set_override_handler(struct ldb_context *ldb,
380 : ldb_attribute_handler_override_fn_t override,
381 : void *private_data)
382 : {
383 514409 : ldb->schema.attribute_handler_override_private = private_data;
384 514409 : ldb->schema.attribute_handler_override = override;
385 514409 : }
386 :
387 : /*
388 : set that the attribute handler override function - used to delegate
389 : schema handling to external code, is handling setting
390 : LDB_ATTR_FLAG_INDEXED
391 : */
392 514361 : void ldb_schema_set_override_indexlist(struct ldb_context *ldb,
393 : bool one_level_indexes)
394 : {
395 514361 : ldb->schema.index_handler_override = true;
396 514361 : ldb->schema.one_level_indexes = one_level_indexes;
397 514361 : }
398 :
399 : /*
400 : * set that the GUID index mode is in operation
401 : *
402 : * The caller must ensure the supplied strings do not go out of
403 : * scope (they are typically constant memory).
404 : */
405 514340 : void ldb_schema_set_override_GUID_index(struct ldb_context *ldb,
406 : const char *GUID_index_attribute,
407 : const char *GUID_index_dn_component)
408 : {
409 514340 : ldb->schema.GUID_index_attribute = GUID_index_attribute;
410 514340 : ldb->schema.GUID_index_dn_component = GUID_index_dn_component;
411 514340 : }
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