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/*
ldb database library
Copyright (C) Simo Sorce 2005-2008
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007-2009
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 extended dn control module
*
* Description: this module builds a special dn for returned search
* results nad creates the special DN in the backend store for new
* values.
*
* This also has the curious result that we convert <SID=S-1-2-345>
* in an attribute value into a normal DN for the rest of the stack
* to process
*
* Authors: Simo Sorce
* Andrew Bartlett
*/
#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_errors.h"
#include "ldb/include/ldb_module.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "dsdb/samdb/samdb.h"
#include "libcli/security/security.h"
#include "dsdb/samdb/ldb_modules/util.h"
#include <time.h>
struct extended_dn_replace_list {
struct extended_dn_replace_list *next;
struct dsdb_dn *dsdb_dn;
TALLOC_CTX *mem_ctx;
struct ldb_val *replace_dn;
struct extended_dn_context *ac;
struct ldb_request *search_req;
};
struct extended_dn_context {
const struct dsdb_schema *schema;
struct ldb_module *module;
struct ldb_context *ldb;
struct ldb_request *req;
struct ldb_request *new_req;
struct extended_dn_replace_list *ops;
struct extended_dn_replace_list *cur;
};
static struct extended_dn_context *extended_dn_context_init(struct ldb_module *module,
struct ldb_request *req)
{
struct extended_dn_context *ac;
struct ldb_context *ldb = ldb_module_get_ctx(module);
ac = talloc_zero(req, struct extended_dn_context);
if (ac == NULL) {
ldb_oom(ldb);
return NULL;
}
ac->schema = dsdb_get_schema(ldb_module_get_ctx(module), ac);
ac->module = module;
ac->ldb = ldb;
ac->req = req;
return ac;
}
/* An extra layer of indirection because LDB does not allow the original request to be altered */
static int extended_final_callback(struct ldb_request *req, struct ldb_reply *ares)
{
int ret = LDB_ERR_OPERATIONS_ERROR;
struct extended_dn_context *ac;
ac = talloc_get_type(req->context, struct extended_dn_context);
if (ares->error != LDB_SUCCESS) {
ret = ldb_module_done(ac->req, ares->controls,
ares->response, ares->error);
} else {
switch (ares->type) {
case LDB_REPLY_ENTRY:
ret = ldb_module_send_entry(ac->req, ares->message, ares->controls);
break;
case LDB_REPLY_REFERRAL:
ret = ldb_module_send_referral(ac->req, ares->referral);
break;
case LDB_REPLY_DONE:
ret = ldb_module_done(ac->req, ares->controls,
ares->response, ares->error);
break;
}
}
return ret;
}
static int extended_replace_dn(struct ldb_request *req, struct ldb_reply *ares)
{
struct extended_dn_replace_list *os = talloc_get_type(req->context,
struct extended_dn_replace_list);
if (!ares) {
return ldb_module_done(os->ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
if (ares->error == LDB_ERR_NO_SUCH_OBJECT) {
/* Don't worry too much about dangling references */
ldb_reset_err_string(os->ac->ldb);
if (os->next) {
struct extended_dn_replace_list *next;
next = os->next;
talloc_free(os);
os = next;
return ldb_next_request(os->ac->module, next->search_req);
} else {
/* Otherwise, we are done - let's run the
* request now we have swapped the DNs for the
* full versions */
return ldb_next_request(os->ac->module, os->ac->req);
}
}
if (ares->error != LDB_SUCCESS) {
return ldb_module_done(os->ac->req, ares->controls,
ares->response, ares->error);
}
/* Only entries are interesting, and we only want the olddn */
switch (ares->type) {
case LDB_REPLY_ENTRY:
{
/* This *must* be the right DN, as this is a base
* search. We can't check, as it could be an extended
* DN, so a module below will resolve it */
struct ldb_dn *dn = ares->message->dn;
/* Rebuild with the string or binary 'extra part' the
* DN may have had as a prefix */
struct dsdb_dn *dsdb_dn = dsdb_dn_construct(ares, dn,
os->dsdb_dn->extra_part,
os->dsdb_dn->oid);
if (dsdb_dn) {
/* Replace the DN with the extended version of the DN
* (ie, add SID and GUID) */
*os->replace_dn = data_blob_string_const(
dsdb_dn_get_extended_linearized(os->mem_ctx,
dsdb_dn, 1));
talloc_free(dsdb_dn);
}
if (os->replace_dn->data == NULL) {
return ldb_module_done(os->ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
break;
}
case LDB_REPLY_REFERRAL:
/* ignore */
break;
case LDB_REPLY_DONE:
talloc_free(ares);
/* Run the next search */
if (os->next) {
struct extended_dn_replace_list *next;
next = os->next;
talloc_free(os);
os = next;
return ldb_next_request(os->ac->module, next->search_req);
} else {
/* Otherwise, we are done - let's run the
* request now we have swapped the DNs for the
* full versions */
return ldb_next_request(os->ac->module, os->ac->new_req);
}
}
talloc_free(ares);
return LDB_SUCCESS;
}
/* We have a 'normal' DN in the inbound request. We need to find out
* what the GUID and SID are on the DN it points to, so we can
* construct an extended DN for storage.
*
* This creates a list of DNs to look up, and the plain DN to replace
*/
static int extended_store_replace(struct extended_dn_context *ac,
TALLOC_CTX *callback_mem_ctx,
struct ldb_val *plain_dn,
bool is_delete,
const char *oid)
{
int ret;
struct extended_dn_replace_list *os;
static const char *attrs[] = {
"objectSid",
"objectGUID",
NULL
};
os = talloc_zero(ac, struct extended_dn_replace_list);
if (!os) {
return ldb_oom(ac->ldb);
}
os->ac = ac;
os->mem_ctx = callback_mem_ctx;
os->dsdb_dn = dsdb_dn_parse(os, ac->ldb, plain_dn, oid);
if (!os->dsdb_dn || !ldb_dn_validate(os->dsdb_dn->dn)) {
talloc_free(os);
ldb_asprintf_errstring(ac->ldb,
"could not parse %.*s as a %s DN", (int)plain_dn->length, plain_dn->data,
oid);
return LDB_ERR_INVALID_DN_SYNTAX;
}
if (is_delete && !ldb_dn_has_extended(os->dsdb_dn->dn)) {
/* NO need to figure this DN out, this element is
* going to be deleted anyway, and becuase it's not
* extended, we have enough information to do the
* delete */
talloc_free(os);
return LDB_SUCCESS;
}
os->replace_dn = plain_dn;
/* The search request here might happen to be for an
* 'extended' style DN, such as <GUID=abced...>. The next
* module in the stack will convert this into a normal DN for
* processing */
ret = ldb_build_search_req(&os->search_req,
ac->ldb, os, os->dsdb_dn->dn, LDB_SCOPE_BASE, NULL,
attrs, NULL, os, extended_replace_dn,
ac->req);
if (ret != LDB_SUCCESS) {
talloc_free(os);
return ret;
}
ret = dsdb_request_add_controls(os->search_req,
DSDB_SEARCH_SHOW_DELETED|DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
if (ret != LDB_SUCCESS) {
talloc_free(os);
return ret;
}
if (ac->ops) {
ac->cur->next = os;
} else {
ac->ops = os;
}
ac->cur = os;
return LDB_SUCCESS;
}
/* add */
static int extended_dn_add(struct ldb_module *module, struct ldb_request *req)
{
struct extended_dn_context *ac;
int ret;
int i, j;
if (ldb_dn_is_special(req->op.add.message->dn)) {
/* do not manipulate our control entries */
return ldb_next_request(module, req);
}
ac = extended_dn_context_init(module, req);
if (!ac) {
return ldb_operr(ldb_module_get_ctx(module));
}
if (!ac->schema) {
/* without schema, this doesn't make any sense */
talloc_free(ac);
return ldb_next_request(module, req);
}
for (i=0; i < req->op.add.message->num_elements; i++) {
const struct ldb_message_element *el = &req->op.add.message->elements[i];
const struct dsdb_attribute *schema_attr
= dsdb_attribute_by_lDAPDisplayName(ac->schema, el->name);
if (!schema_attr) {
continue;
}
/* We only setup an extended DN GUID on DN elements */
if (dsdb_dn_oid_to_format(schema_attr->syntax->ldap_oid) == DSDB_INVALID_DN) {
continue;
}
/* Before we setup a procedure to modify the incoming message, we must copy it */
if (!ac->new_req) {
struct ldb_message *msg = ldb_msg_copy(ac, req->op.add.message);
if (!msg) {
return ldb_oom(ldb_module_get_ctx(module));
}
ret = ldb_build_add_req(&ac->new_req, ac->ldb, ac, msg, req->controls, ac, extended_final_callback, req);
if (ret != LDB_SUCCESS) {
return ret;
}
}
/* Re-calculate el */
el = &ac->new_req->op.add.message->elements[i];
for (j = 0; j < el->num_values; j++) {
ret = extended_store_replace(ac, ac->new_req->op.add.message->elements, &el->values[j],
false, schema_attr->syntax->ldap_oid);
if (ret != LDB_SUCCESS) {
return ret;
}
}
}
/* if no DNs were set continue */
if (ac->ops == NULL) {
talloc_free(ac);
return ldb_next_request(module, req);
}
/* start with the searches */
return ldb_next_request(module, ac->ops->search_req);
}
/* modify */
static int extended_dn_modify(struct ldb_module *module, struct ldb_request *req)
{
/* Look over list of modifications */
/* Find if any are for linked attributes */
/* Determine the effect of the modification */
/* Apply the modify to the linked entry */
int i, j;
struct extended_dn_context *ac;
int ret;
if (ldb_dn_is_special(req->op.mod.message->dn)) {
/* do not manipulate our control entries */
return ldb_next_request(module, req);
}
ac = extended_dn_context_init(module, req);
if (!ac) {
return ldb_operr(ldb_module_get_ctx(module));
}
if (!ac->schema) {
talloc_free(ac);
/* without schema, this doesn't make any sense */
return ldb_next_request(module, req);
}
for (i=0; i < req->op.mod.message->num_elements; i++) {
const struct ldb_message_element *el = &req->op.mod.message->elements[i];
const struct dsdb_attribute *schema_attr
= dsdb_attribute_by_lDAPDisplayName(ac->schema, el->name);
if (!schema_attr) {
continue;
}
/* We only setup an extended DN GUID on these particular DN objects */
if (dsdb_dn_oid_to_format(schema_attr->syntax->ldap_oid) == DSDB_INVALID_DN) {
continue;
}
/* Before we setup a procedure to modify the incoming message, we must copy it */
if (!ac->new_req) {
struct ldb_message *msg = ldb_msg_copy(ac, req->op.mod.message);
if (!msg) {
talloc_free(ac);
return ldb_oom(ac->ldb);
}
ret = ldb_build_mod_req(&ac->new_req, ac->ldb, ac, msg, req->controls, ac, extended_final_callback, req);
if (ret != LDB_SUCCESS) {
talloc_free(ac);
return ret;
}
}
/* Re-calculate el */
el = &ac->new_req->op.mod.message->elements[i];
/* For each value being added, we need to setup the lookups to fill in the extended DN */
for (j = 0; j < el->num_values; j++) {
/* If we are just going to delete this
* element, only do a lookup if
* extended_store_replace determines it's an
* input of an extended DN */
bool is_delete = ((el->flags & LDB_FLAG_MOD_MASK) == LDB_FLAG_MOD_DELETE);
ret = extended_store_replace(ac, req->op.mod.message->elements, &el->values[j],
is_delete, schema_attr->syntax->ldap_oid);
if (ret != LDB_SUCCESS) {
talloc_free(ac);
return ret;
}
}
}
/* if DNs were set continue */
if (ac->ops == NULL) {
talloc_free(ac);
return ldb_next_request(module, req);
}
/* start with the searches */
return ldb_next_request(module, ac->ops->search_req);
}
_PUBLIC_ const struct ldb_module_ops ldb_extended_dn_store_module_ops = {
.name = "extended_dn_store",
.add = extended_dn_add,
.modify = extended_dn_modify,
};
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