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/*
ldb database library
Copyright (C) Simo Sorce 2006-2008
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
Copyright (C) Stefan Metzmacher 2009
Copyright (C) Matthias Dieter Wallnöfer 2010
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 Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Name: ldb
*
* Component: objectclass attribute checking module
*
* Description: this checks the attributes on a directory entry (if they're
* allowed, if the syntax is correct, if mandatory ones are missing,
* denies the deletion of mandatory ones...). The module contains portions
* of the "objectclass" and the "validate_update" LDB module.
*
* Author: Matthias Dieter Wallnöfer
*/
#include "includes.h"
#include "ldb_module.h"
#include "dsdb/samdb/samdb.h"
struct oc_context {
struct ldb_module *module;
struct ldb_request *req;
const struct dsdb_schema *schema;
struct ldb_reply *search_res;
struct ldb_reply *mod_ares;
};
static struct oc_context *oc_init_context(struct ldb_module *module,
struct ldb_request *req)
{
struct ldb_context *ldb;
struct oc_context *ac;
ldb = ldb_module_get_ctx(module);
ac = talloc_zero(req, struct oc_context);
if (ac == NULL) {
ldb_oom(ldb);
return NULL;
}
ac->module = module;
ac->req = req;
ac->schema = dsdb_get_schema(ldb, ac);
return ac;
}
static int oc_op_callback(struct ldb_request *req, struct ldb_reply *ares);
static int attr_handler(struct oc_context *ac)
{
struct ldb_context *ldb;
struct ldb_message *msg;
struct ldb_request *child_req;
const struct dsdb_attribute *attr;
unsigned int i;
int ret;
WERROR werr;
ldb = ldb_module_get_ctx(ac->module);
if (ac->req->operation == LDB_ADD) {
msg = ldb_msg_copy_shallow(ac, ac->req->op.add.message);
} else {
msg = ldb_msg_copy_shallow(ac, ac->req->op.mod.message);
}
if (msg == NULL) {
return ldb_oom(ldb);
}
/* Check if attributes exist in the schema, if the values match,
* if they're not operational and fix the names to the match the schema
* case */
for (i = 0; i < msg->num_elements; i++) {
attr = dsdb_attribute_by_lDAPDisplayName(ac->schema,
msg->elements[i].name);
if (attr == NULL) {
ldb_asprintf_errstring(ldb, "objectclass_attrs: attribute '%s' on entry '%s' was not found in the schema!",
msg->elements[i].name,
ldb_dn_get_linearized(msg->dn));
return LDB_ERR_NO_SUCH_ATTRIBUTE;
}
if ((attr->linkID & 1) == 1) {
/* Odd is for the target. Illegal to modify */
ldb_asprintf_errstring(ldb,
"objectclass_attrs: attribute '%s' on entry '%s' must not be modified directly, it is a linked attribute",
msg->elements[i].name,
ldb_dn_get_linearized(msg->dn));
return LDB_ERR_UNWILLING_TO_PERFORM;
}
if (!(msg->elements[i].flags & LDB_FLAG_INTERNAL_DISABLE_VALIDATION)) {
werr = attr->syntax->validate_ldb(ldb, ac->schema, attr,
&msg->elements[i]);
if (!W_ERROR_IS_OK(werr)) {
ldb_asprintf_errstring(ldb, "objectclass_attrs: attribute '%s' on entry '%s' contains at least one invalid value!",
msg->elements[i].name,
ldb_dn_get_linearized(msg->dn));
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
}
if ((attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED) != 0) {
ldb_asprintf_errstring(ldb, "objectclass_attrs: attribute '%s' on entry '%s' is constructed!",
msg->elements[i].name,
ldb_dn_get_linearized(msg->dn));
if (ac->req->operation == LDB_ADD) {
return LDB_ERR_UNDEFINED_ATTRIBUTE_TYPE;
} else {
return LDB_ERR_CONSTRAINT_VIOLATION;
}
}
/* subsitute the attribute name to match in case */
msg->elements[i].name = attr->lDAPDisplayName;
}
if (ac->req->operation == LDB_ADD) {
ret = ldb_build_add_req(&child_req, ldb, ac,
msg, ac->req->controls,
ac, oc_op_callback, ac->req);
} else {
ret = ldb_build_mod_req(&child_req, ldb, ac,
msg, ac->req->controls,
ac, oc_op_callback, ac->req);
}
if (ret != LDB_SUCCESS) {
return ret;
}
return ldb_next_request(ac->module, child_req);
}
/*
these are attributes which are left over from old ways of doing
things in ldb, and are harmless
*/
static const char *harmless_attrs[] = { "parentGUID", NULL };
static int attr_handler2(struct oc_context *ac)
{
struct ldb_context *ldb;
struct ldb_message_element *oc_element;
struct ldb_message *msg;
const char **must_contain, **may_contain, **found_must_contain;
const struct dsdb_attribute *attr;
unsigned int i;
bool found;
ldb = ldb_module_get_ctx(ac->module);
if (ac->search_res == NULL) {
return ldb_operr(ldb);
}
/* We rely here on the preceeding "objectclass" LDB module which did
* already fix up the objectclass list (inheritance, order...). */
oc_element = ldb_msg_find_element(ac->search_res->message,
"objectClass");
if (oc_element == NULL) {
return ldb_operr(ldb);
}
must_contain = dsdb_full_attribute_list(ac, ac->schema, oc_element,
DSDB_SCHEMA_ALL_MUST);
may_contain = dsdb_full_attribute_list(ac, ac->schema, oc_element,
DSDB_SCHEMA_ALL_MAY);
found_must_contain = const_str_list(str_list_copy(ac, must_contain));
if ((must_contain == NULL) || (may_contain == NULL)
|| (found_must_contain == NULL)) {
return ldb_operr(ldb);
}
/* Check if all specified attributes are valid in the given
* objectclasses and if they meet additional schema restrictions. */
msg = ac->search_res->message;
for (i = 0; i < msg->num_elements; i++) {
attr = dsdb_attribute_by_lDAPDisplayName(ac->schema,
msg->elements[i].name);
if (attr == NULL) {
return ldb_operr(ldb);
}
/* Check if they're single-valued if this is requested */
if ((msg->elements[i].num_values > 1) && (attr->isSingleValued)) {
ldb_asprintf_errstring(ldb, "objectclass_attrs: attribute '%s' on entry '%s' is single-valued!",
msg->elements[i].name,
ldb_dn_get_linearized(msg->dn));
if (ac->req->operation == LDB_ADD) {
return LDB_ERR_CONSTRAINT_VIOLATION;
} else {
return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
}
}
/* We can use "str_list_check" with "strcmp" here since the
* attribute informations from the schema are always equal
* up-down-cased. */
found = str_list_check(must_contain, attr->lDAPDisplayName);
if (found) {
str_list_remove(found_must_contain, attr->lDAPDisplayName);
} else {
found = str_list_check(may_contain, attr->lDAPDisplayName);
}
if (!found) {
found = str_list_check(harmless_attrs, attr->lDAPDisplayName);
}
if (!found) {
ldb_asprintf_errstring(ldb, "objectclass_attrs: attribute '%s' on entry '%s' does not exist in the specified objectclasses!",
msg->elements[i].name,
ldb_dn_get_linearized(msg->dn));
return LDB_ERR_OBJECT_CLASS_VIOLATION;
}
}
if (found_must_contain[0] != NULL) {
ldb_asprintf_errstring(ldb, "objectclass_attrs: at least one mandatory attribute ('%s') on entry '%s' wasn't specified!",
found_must_contain[0],
ldb_dn_get_linearized(msg->dn));
return LDB_ERR_OBJECT_CLASS_VIOLATION;
}
return ldb_module_done(ac->req, ac->mod_ares->controls,
ac->mod_ares->response, LDB_SUCCESS);
}
static int get_search_callback(struct ldb_request *req, struct ldb_reply *ares)
{
struct ldb_context *ldb;
struct oc_context *ac;
int ret;
ac = talloc_get_type(req->context, struct oc_context);
ldb = ldb_module_get_ctx(ac->module);
if (!ares) {
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
if (ares->error != LDB_SUCCESS) {
return ldb_module_done(ac->req, ares->controls,
ares->response, ares->error);
}
ldb_reset_err_string(ldb);
switch (ares->type) {
case LDB_REPLY_ENTRY:
if (ac->search_res != NULL) {
ldb_set_errstring(ldb, "Too many results");
talloc_free(ares);
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
ac->search_res = talloc_steal(ac, ares);
break;
case LDB_REPLY_REFERRAL:
/* ignore */
talloc_free(ares);
break;
case LDB_REPLY_DONE:
talloc_free(ares);
ret = attr_handler2(ac);
if (ret != LDB_SUCCESS) {
return ldb_module_done(ac->req, NULL, NULL, ret);
}
break;
}
return LDB_SUCCESS;
}
static int oc_op_callback(struct ldb_request *req, struct ldb_reply *ares)
{
struct oc_context *ac;
struct ldb_context *ldb;
struct ldb_request *search_req;
struct ldb_dn *base_dn;
int ret;
ac = talloc_get_type(req->context, struct oc_context);
ldb = ldb_module_get_ctx(ac->module);
if (!ares) {
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
if (ares->type == LDB_REPLY_REFERRAL) {
return ldb_module_send_referral(ac->req, ares->referral);
}
if (ares->error != LDB_SUCCESS) {
return ldb_module_done(ac->req, ares->controls, ares->response,
ares->error);
}
if (ares->type != LDB_REPLY_DONE) {
talloc_free(ares);
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
ac->search_res = NULL;
ac->mod_ares = talloc_steal(ac, ares);
/* This looks up all attributes of our just added/modified entry */
base_dn = ac->req->operation == LDB_ADD ? ac->req->op.add.message->dn
: ac->req->op.mod.message->dn;
ret = ldb_build_search_req(&search_req, ldb, ac, base_dn,
LDB_SCOPE_BASE, "(objectClass=*)",
NULL, NULL, ac,
get_search_callback, ac->req);
if (ret != LDB_SUCCESS) {
return ldb_module_done(ac->req, NULL, NULL, ret);
}
ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID,
true, NULL);
if (ret != LDB_SUCCESS) {
return ldb_module_done(ac->req, NULL, NULL, ret);
}
ret = ldb_next_request(ac->module, search_req);
if (ret != LDB_SUCCESS) {
return ldb_module_done(ac->req, NULL, NULL, ret);
}
/* "ldb_module_done" isn't called here since we need to do additional
* checks. It is called at the end of "attr_handler2". */
return LDB_SUCCESS;
}
static int objectclass_attrs_add(struct ldb_module *module,
struct ldb_request *req)
{
struct ldb_context *ldb;
struct oc_context *ac;
ldb = ldb_module_get_ctx(module);
ldb_debug(ldb, LDB_DEBUG_TRACE, "objectclass_attrs_add\n");
/* do not manipulate our control entries */
if (ldb_dn_is_special(req->op.add.message->dn)) {
return ldb_next_request(module, req);
}
ac = oc_init_context(module, req);
if (ac == NULL) {
return ldb_operr(ldb);
}
/* without schema, there isn't much to do here */
if (ac->schema == NULL) {
talloc_free(ac);
return ldb_next_request(module, req);
}
return attr_handler(ac);
}
static int objectclass_attrs_modify(struct ldb_module *module,
struct ldb_request *req)
{
struct ldb_context *ldb;
struct oc_context *ac;
ldb = ldb_module_get_ctx(module);
ldb_debug(ldb, LDB_DEBUG_TRACE, "objectclass_attrs_modify\n");
/* do not manipulate our control entries */
if (ldb_dn_is_special(req->op.mod.message->dn)) {
return ldb_next_request(module, req);
}
ac = oc_init_context(module, req);
if (ac == NULL) {
return ldb_operr(ldb);
}
/* without schema, there isn't much to do here */
if (ac->schema == NULL) {
talloc_free(ac);
return ldb_next_request(module, req);
}
return attr_handler(ac);
}
_PUBLIC_ const struct ldb_module_ops ldb_objectclass_attrs_module_ops = {
.name = "objectclass_attrs",
.add = objectclass_attrs_add,
.modify = objectclass_attrs_modify
};
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