4 Copyright (C) Andrew Bartlett 2005
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 * Component: ldb kludge ACL module
26 * Description: Simple module to enforce a simple form of access
27 * control, sufficient for securing a default Samba4
30 * Author: Andrew Bartlett
34 #include "ldb/include/ldb.h"
35 #include "ldb/include/ldb_errors.h"
36 #include "ldb/include/ldb_private.h"
37 #include "auth/auth.h"
41 * - System can read passwords
42 * - Administrators can write anything
43 * - Users can read anything that is not a password
47 const char *password_attribs[] = {
57 struct kludge_private_data {
58 const char **password_attrs;
61 static enum user_is what_is_user(struct ldb_module *module)
63 struct auth_session_info *session_info
64 = ldb_get_opaque(module->ldb, "sessionInfo");
69 if (is_system_token(session_info->security_token)) {
73 if (is_administrator_token(session_info->security_token)) {
76 if (is_authenticated_token(session_info->security_token)) {
79 if (is_anonymous_token(session_info->security_token)) {
86 static int kludge_acl_search(struct ldb_module *module, struct ldb_request *req)
88 struct kludge_private_data *data = talloc_get_type(module->private_data, struct kludge_private_data);
89 struct ldb_message *msg;
90 enum user_is user_type;
93 /* go down the path and wait for reply to filter out stuff if needed */
94 ret = ldb_next_request(module, req);
96 /* We may not be fully initialised yet, or we might have just
98 if (ret != LDB_SUCCESS || !data->password_attrs) {
102 user_type = what_is_user(module);
108 /* For every message, remove password attributes */
109 for (i=0; i < req->op.search.res->count; i++) {
110 msg = req->op.search.res->msgs[i];
111 for (j=0; data->password_attrs[j]; j++) {
112 ldb_msg_remove_attr(msg, data->password_attrs[j]);
119 /* ANY change type */
120 static int kludge_acl_change(struct ldb_module *module, struct ldb_request *req){
121 enum user_is user_type = what_is_user(module);
125 return ldb_next_request(module, req);
127 ldb_set_errstring(module,
128 talloc_asprintf(req, "kludge_acl_change: "
129 "attempted database modify not permitted. User is not SYSTEM or an administrator"));
130 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
134 /* start a transaction */
135 static int kludge_acl_start_trans(struct ldb_module *module)
137 return ldb_next_start_trans(module);
140 /* end a transaction */
141 static int kludge_acl_end_trans(struct ldb_module *module)
143 return ldb_next_end_trans(module);
146 /* delete a transaction */
147 static int kludge_acl_del_trans(struct ldb_module *module)
149 return ldb_next_del_trans(module);
152 static int kludge_acl_request(struct ldb_module *module, struct ldb_request *req)
154 switch (req->operation) {
157 return kludge_acl_search(module, req);
158 case LDB_REQ_REGISTER:
159 return ldb_next_request(module, req);
161 /* anything else must be a change of some kind */
162 return kludge_acl_change(module, req);
166 static int kludge_acl_init_2(struct ldb_module *module)
169 TALLOC_CTX *mem_ctx = talloc_new(module);
170 const char *attrs[] = { "attribute", NULL };
171 struct ldb_result *res;
172 struct ldb_message *msg;
173 struct ldb_message_element *password_attributes;
175 struct kludge_private_data *data = talloc_get_type(module->private_data, struct kludge_private_data);
176 data->password_attrs = NULL;
179 return LDB_ERR_OPERATIONS_ERROR;
182 ret = ldb_search(module->ldb, ldb_dn_explode(mem_ctx, "@KLUDGEACL"),
186 if (ret != LDB_SUCCESS) {
187 talloc_free(mem_ctx);
190 if (res->count == 0) {
191 talloc_free(mem_ctx);
192 data->password_attrs = NULL;
196 if (res->count > 1) {
197 return LDB_ERR_CONSTRAINT_VIOLAION;
202 password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
203 if (!password_attributes) {
206 data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
207 if (!data->password_attrs) {
208 return LDB_ERR_OPERATIONS_ERROR;
210 for (i=0; i < password_attributes->num_values; i++) {
211 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
212 talloc_steal(data->password_attrs, password_attributes->values[i].data);
214 data->password_attrs[i] = NULL;
218 static const struct ldb_module_ops kludge_acl_ops = {
219 .name = "kludge_acl",
220 .request = kludge_acl_request,
221 .start_transaction = kludge_acl_start_trans,
222 .end_transaction = kludge_acl_end_trans,
223 .del_transaction = kludge_acl_del_trans,
224 .second_stage_init = kludge_acl_init_2
227 struct ldb_module *kludge_acl_module_init(struct ldb_context *ldb, const char *options[])
229 struct ldb_module *ctx;
230 struct kludge_private_data *data;
232 ctx = talloc(ldb, struct ldb_module);
236 data = talloc(ctx, struct kludge_private_data);
242 data->password_attrs = NULL;
243 ctx->private_data = data;
246 ctx->prev = ctx->next = NULL;
247 ctx->ops = &kludge_acl_ops;