summaryrefslogtreecommitdiff
path: root/source4/dsdb/samdb/ldb_modules/linked_attributes.c
blob: 876ada6d2c7d1ef13bf9e60cf5796bb05a8b03a0 (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
/* 
   ldb database library

   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007
   Copyright (C) Simo Sorce <idra@samba.org> 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 linked_attributes module
 *
 *  Description: Module to ensure linked attribute pairs remain in sync
 *
 *  Author: Andrew Bartlett
 */

#include "includes.h"
#include "ldb_module.h"
#include "util/dlinklist.h"
#include "dsdb/samdb/samdb.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "dsdb/samdb/ldb_modules/util.h"


static int linked_attributes_fix_links(struct ldb_module *module,
				       struct ldb_dn *old_dn, struct ldb_dn *new_dn,
				       struct ldb_message_element *el, struct dsdb_schema *schema,
				       const struct dsdb_attribute *schema_attr)
{
	unsigned int i;
	TALLOC_CTX *tmp_ctx = talloc_new(module);
	struct ldb_context *ldb = ldb_module_get_ctx(module);
	const struct dsdb_attribute *target;
	const char *attrs[2];

	target = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
	if (target == NULL) {
		/* there is no counterpart link to change */
		return LDB_SUCCESS;
	}

	attrs[0] = target->lDAPDisplayName;
	attrs[1] = NULL;

	for (i=0; i<el->num_values; i++) {
		struct dsdb_dn *dsdb_dn;
		unsigned int j;
		int ret;
		struct ldb_result *res;
		struct ldb_message *msg;
		struct ldb_message_element *el2;

		dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], schema_attr->syntax->ldap_oid);
		if (dsdb_dn == NULL) {
			talloc_free(tmp_ctx);
			return LDB_ERR_INVALID_DN_SYNTAX;
		}

		ret = dsdb_module_search_dn(module, tmp_ctx, &res, dsdb_dn->dn,
					    attrs,
					    DSDB_SEARCH_SHOW_DELETED |
					    DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
					    DSDB_SEARCH_REVEAL_INTERNALS);
		if (ret != LDB_SUCCESS) {
			ldb_asprintf_errstring(ldb, "Linked attribute %s->%s between %s and %s - remote not found - %s",
					       el->name, target->lDAPDisplayName,
					       ldb_dn_get_linearized(old_dn),
					       ldb_dn_get_linearized(dsdb_dn->dn),
					       ldb_errstring(ldb));
			talloc_free(tmp_ctx);
			return ret;
		}
		msg = res->msgs[0];

		if (msg->num_elements != 1 ||
		    ldb_attr_cmp(msg->elements[0].name, target->lDAPDisplayName) != 0) {
			ldb_set_errstring(ldb, "Bad msg elements in linked_attributes_fix_links");
			talloc_free(tmp_ctx);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		el2 = &msg->elements[0];

		el2->flags = LDB_FLAG_MOD_REPLACE;

		/* find our DN in the values */
		for (j=0; j<el2->num_values; j++) {
			struct dsdb_dn *dsdb_dn2;
			dsdb_dn2 = dsdb_dn_parse(msg, ldb, &el2->values[j], target->syntax->ldap_oid);
			if (dsdb_dn2 == NULL) {
				talloc_free(tmp_ctx);
				return LDB_ERR_INVALID_DN_SYNTAX;
			}
			if (ldb_dn_compare(old_dn, dsdb_dn2->dn) != 0) {
				continue;
			}
			ret = ldb_dn_update_components(dsdb_dn2->dn, new_dn);
			if (ret != LDB_SUCCESS) {
				talloc_free(tmp_ctx);
				return ret;
			}

			el2->values[j] = data_blob_string_const(
				dsdb_dn_get_extended_linearized(el2->values, dsdb_dn2, 1));
		}

		ret = dsdb_check_single_valued_link(target, el2);
		if (ret != LDB_SUCCESS) {
			talloc_free(tmp_ctx);
			return ret;
		}

		ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
		if (ret != LDB_SUCCESS) {
			ldb_asprintf_errstring(ldb, "Linked attribute %s->%s between %s and %s - update failed - %s",
					       el->name, target->lDAPDisplayName,
					       ldb_dn_get_linearized(old_dn),
					       ldb_dn_get_linearized(dsdb_dn->dn),
					       ldb_errstring(ldb));
			talloc_free(tmp_ctx);
			return ret;
		}
	}

	talloc_free(tmp_ctx);
	return LDB_SUCCESS;
}


/* rename */
static int linked_attributes_rename(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_result *res;
	struct ldb_message *msg;
	unsigned int i;
	int ret;
	struct ldb_context *ldb = ldb_module_get_ctx(module);
	struct dsdb_schema *schema;
	/*
	   - load the current msg
	   - find any linked attributes
	   - if its a link then find the target object
	   - modify the target linked attributes with the new DN
	*/
	ret = dsdb_module_search_dn(module, req, &res, req->op.rename.olddn,
				    NULL, DSDB_SEARCH_SHOW_DELETED);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	schema = dsdb_get_schema(ldb, res);
	if (!schema) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	msg = res->msgs[0];

	for (i=0; i<msg->num_elements; i++) {
		struct ldb_message_element *el = &msg->elements[i];
		const struct dsdb_attribute *schema_attr
			= dsdb_attribute_by_lDAPDisplayName(schema, el->name);
		if (!schema_attr || schema_attr->linkID == 0) {
			continue;
		}
		ret = linked_attributes_fix_links(module, msg->dn, req->op.rename.newdn, el,
						  schema, schema_attr);
		if (ret != LDB_SUCCESS) {
			talloc_free(res);
			return ret;
		}
	}

	talloc_free(res);

	return ldb_next_request(module, req);
}


_PUBLIC_ const struct ldb_module_ops ldb_linked_attributes_module_ops = {
	.name		   = "linked_attributes",
	.rename	  	   = linked_attributes_rename,
};