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"
38 #include "libcli/security/proto.h"
42 * - System can read passwords
43 * - Administrators can write anything
44 * - Users can read anything that is not a password
55 struct kludge_private_data {
56 const char **password_attrs;
59 static enum user_is what_is_user(struct ldb_module *module)
61 struct auth_session_info *session_info
62 = ldb_get_opaque(module->ldb, "sessionInfo");
67 if (is_system_token(session_info->security_token)) {
71 if (is_administrator_token(session_info->security_token)) {
74 if (is_authenticated_token(session_info->security_token)) {
77 if (is_anonymous_token(session_info->security_token)) {
83 static const char *user_name(TALLOC_CTX *mem_ctx, struct ldb_module *module)
85 struct auth_session_info *session_info
86 = ldb_get_opaque(module->ldb, "sessionInfo");
88 return "UNKNOWN (NULL)";
91 return talloc_asprintf(mem_ctx, "%s\\%s",
92 session_info->server_info->domain_name,
93 session_info->server_info->account_name);
98 static int kludge_acl_search(struct ldb_module *module, struct ldb_request *req)
100 struct kludge_private_data *data = talloc_get_type(module->private_data, struct kludge_private_data);
101 struct ldb_message *msg;
102 enum user_is user_type;
105 /* go down the path and wait for reply to filter out stuff if needed */
106 ret = ldb_next_request(module, req);
108 /* We may not be fully initialised yet, or we might have just
110 if (ret != LDB_SUCCESS || !data->password_attrs) {
114 user_type = what_is_user(module);
120 /* For every message, remove password attributes */
121 for (i=0; i < req->op.search.res->count; i++) {
122 msg = req->op.search.res->msgs[i];
123 for (j=0; data->password_attrs[j]; j++) {
124 ldb_msg_remove_attr(msg, data->password_attrs[j]);
131 /* ANY change type */
132 static int kludge_acl_change(struct ldb_module *module, struct ldb_request *req){
133 enum user_is user_type = what_is_user(module);
137 return ldb_next_request(module, req);
139 ldb_set_errstring(module->ldb,
140 talloc_asprintf(req, "kludge_acl_change: "
141 "attempted database modify not permitted. User %s is not SYSTEM or an administrator",
142 user_name(req, module)));
143 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
147 /* start a transaction */
148 static int kludge_acl_start_trans(struct ldb_module *module)
150 return ldb_next_start_trans(module);
153 /* end a transaction */
154 static int kludge_acl_end_trans(struct ldb_module *module)
156 return ldb_next_end_trans(module);
159 /* delete a transaction */
160 static int kludge_acl_del_trans(struct ldb_module *module)
162 return ldb_next_del_trans(module);
165 static int kludge_acl_request(struct ldb_module *module, struct ldb_request *req)
167 switch (req->operation) {
170 return kludge_acl_search(module, req);
171 case LDB_REQ_REGISTER:
172 return ldb_next_request(module, req);
174 /* anything else must be a change of some kind */
175 return kludge_acl_change(module, req);
179 static int kludge_acl_init(struct ldb_module *module)
182 TALLOC_CTX *mem_ctx = talloc_new(module);
183 const char *attrs[] = { "attribute", NULL };
184 struct ldb_result *res;
185 struct ldb_message *msg;
186 struct ldb_message_element *password_attributes;
188 struct kludge_private_data *data;
190 data = talloc(module, struct kludge_private_data);
192 return LDB_ERR_OPERATIONS_ERROR;
195 data->password_attrs = NULL;
196 module->private_data = data;
199 return LDB_ERR_OPERATIONS_ERROR;
202 ret = ldb_search(module->ldb, ldb_dn_explode(mem_ctx, "@KLUDGEACL"),
206 if (ret != LDB_SUCCESS) {
209 talloc_steal(mem_ctx, res);
210 if (res->count == 0) {
214 if (res->count > 1) {
215 talloc_free(mem_ctx);
216 return LDB_ERR_CONSTRAINT_VIOLATION;
221 password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
222 if (!password_attributes) {
225 data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
226 if (!data->password_attrs) {
227 talloc_free(mem_ctx);
228 return LDB_ERR_OPERATIONS_ERROR;
230 for (i=0; i < password_attributes->num_values; i++) {
231 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
232 talloc_steal(data->password_attrs, password_attributes->values[i].data);
234 data->password_attrs[i] = NULL;
237 talloc_free(mem_ctx);
238 return ldb_next_init(module);
241 static const struct ldb_module_ops kludge_acl_ops = {
242 .name = "kludge_acl",
243 .request = kludge_acl_request,
244 .start_transaction = kludge_acl_start_trans,
245 .end_transaction = kludge_acl_end_trans,
246 .del_transaction = kludge_acl_del_trans,
247 .init_context = kludge_acl_init
250 int ldb_kludge_acl_init(void)
252 return ldb_register_module(&kludge_acl_ops);