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/*
ldb database library
Copyright (C) Andrew Tridgell 2004
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser 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: ldb search functions
*
* Description: functions to search ldb+tdb databases
*
* Author: Andrew Tridgell
*/
#include "ldb_includes.h"
#include "ldb_tdb.h"
/*
add one element to a message
*/
static int msg_add_element(struct ldb_message *ret,
const struct ldb_message_element *el,
int check_duplicates)
{
unsigned int i;
struct ldb_message_element *e2, *elnew;
if (check_duplicates && ldb_msg_find_element(ret, el->name)) {
/* its already there */
return 0;
}
e2 = talloc_realloc(ret, ret->elements, struct ldb_message_element, ret->num_elements+1);
if (!e2) {
return -1;
}
ret->elements = e2;
elnew = &e2[ret->num_elements];
elnew->name = talloc_strdup(ret->elements, el->name);
if (!elnew->name) {
return -1;
}
if (el->num_values) {
elnew->values = talloc_array(ret->elements, struct ldb_val, el->num_values);
if (!elnew->values) {
return -1;
}
} else {
elnew->values = NULL;
}
for (i=0;i<el->num_values;i++) {
elnew->values[i] = ldb_val_dup(elnew->values, &el->values[i]);
if (elnew->values[i].length != el->values[i].length) {
return -1;
}
}
elnew->num_values = el->num_values;
ret->num_elements++;
return 0;
}
/*
add the special distinguishedName element
*/
static int msg_add_distinguished_name(struct ldb_message *msg)
{
struct ldb_message_element el;
struct ldb_val val;
int ret;
el.flags = 0;
el.name = "distinguishedName";
el.num_values = 1;
el.values = &val;
val.data = (uint8_t *)ldb_dn_alloc_linearized(msg, msg->dn);
val.length = strlen((char *)val.data);
ret = msg_add_element(msg, &el, 1);
return ret;
}
/*
add all elements from one message into another
*/
static int msg_add_all_elements(struct ldb_module *module, struct ldb_message *ret,
const struct ldb_message *msg)
{
struct ldb_context *ldb = module->ldb;
unsigned int i;
int check_duplicates = (ret->num_elements != 0);
if (msg_add_distinguished_name(ret) != 0) {
return -1;
}
for (i=0;i<msg->num_elements;i++) {
const struct ldb_schema_attribute *a;
a = ldb_schema_attribute_by_name(ldb, msg->elements[i].name);
if (a->flags & LDB_ATTR_FLAG_HIDDEN) {
continue;
}
if (msg_add_element(ret, &msg->elements[i],
check_duplicates) != 0) {
return -1;
}
}
return 0;
}
/*
pull the specified list of attributes from a message
*/
static struct ldb_message *ltdb_pull_attrs(struct ldb_module *module,
TALLOC_CTX *mem_ctx,
const struct ldb_message *msg,
const char * const *attrs)
{
struct ldb_message *ret;
int i;
ret = talloc(mem_ctx, struct ldb_message);
if (!ret) {
return NULL;
}
ret->dn = ldb_dn_copy(ret, msg->dn);
if (!ret->dn) {
talloc_free(ret);
return NULL;
}
ret->num_elements = 0;
ret->elements = NULL;
if (!attrs) {
if (msg_add_all_elements(module, ret, msg) != 0) {
talloc_free(ret);
return NULL;
}
return ret;
}
for (i=0;attrs[i];i++) {
struct ldb_message_element *el;
if (strcmp(attrs[i], "*") == 0) {
if (msg_add_all_elements(module, ret, msg) != 0) {
talloc_free(ret);
return NULL;
}
continue;
}
if (ldb_attr_cmp(attrs[i], "distinguishedName") == 0) {
if (msg_add_distinguished_name(ret) != 0) {
return NULL;
}
continue;
}
el = ldb_msg_find_element(msg, attrs[i]);
if (!el) {
continue;
}
if (msg_add_element(ret, el, 1) != 0) {
talloc_free(ret);
return NULL;
}
}
return ret;
}
/*
search the database for a single simple dn.
return LDB_ERR_NO_SUCH_OBJECT on record-not-found
and LDB_SUCCESS on success
*/
int ltdb_search_base(struct ldb_module *module, struct ldb_dn *dn)
{
struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
TDB_DATA tdb_key, tdb_data;
if (ldb_dn_is_null(dn)) {
return LDB_ERR_NO_SUCH_OBJECT;
}
/* form the key */
tdb_key = ltdb_key(module, dn);
if (!tdb_key.dptr) {
return LDB_ERR_OPERATIONS_ERROR;
}
tdb_data = tdb_fetch(ltdb->tdb, tdb_key);
talloc_free(tdb_key.dptr);
if (!tdb_data.dptr) {
return LDB_ERR_NO_SUCH_OBJECT;
}
free(tdb_data.dptr);
return LDB_SUCCESS;
}
/*
search the database for a single simple dn, returning all attributes
in a single message
return LDB_ERR_NO_SUCH_OBJECT on record-not-found
and LDB_SUCCESS on success
*/
int ltdb_search_dn1(struct ldb_module *module, struct ldb_dn *dn, struct ldb_message *msg)
{
struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
int ret;
TDB_DATA tdb_key, tdb_data;
memset(msg, 0, sizeof(*msg));
/* form the key */
tdb_key = ltdb_key(module, dn);
if (!tdb_key.dptr) {
return LDB_ERR_OPERATIONS_ERROR;
}
tdb_data = tdb_fetch(ltdb->tdb, tdb_key);
talloc_free(tdb_key.dptr);
if (!tdb_data.dptr) {
return LDB_ERR_NO_SUCH_OBJECT;
}
msg->num_elements = 0;
msg->elements = NULL;
ret = ltdb_unpack_data(module, &tdb_data, msg);
free(tdb_data.dptr);
if (ret == -1) {
return LDB_ERR_OPERATIONS_ERROR;
}
if (!msg->dn) {
msg->dn = ldb_dn_copy(msg, dn);
}
if (!msg->dn) {
return LDB_ERR_OPERATIONS_ERROR;
}
return LDB_SUCCESS;
}
/*
lock the database for read - use by ltdb_search
*/
static int ltdb_lock_read(struct ldb_module *module)
{
struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
if (ltdb->in_transaction == 0) {
return tdb_lockall_read(ltdb->tdb);
}
return 0;
}
/*
unlock the database after a ltdb_lock_read()
*/
static int ltdb_unlock_read(struct ldb_module *module)
{
struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
if (ltdb->in_transaction == 0) {
return tdb_unlockall_read(ltdb->tdb);
}
return 0;
}
/*
add a set of attributes from a record to a set of results
return 0 on success, -1 on failure
*/
int ltdb_add_attr_results(struct ldb_module *module,
TALLOC_CTX *mem_ctx,
struct ldb_message *msg,
const char * const attrs[],
unsigned int *count,
struct ldb_message ***res)
{
struct ldb_message *msg2;
struct ldb_message **res2;
/* pull the attributes that the user wants */
msg2 = ltdb_pull_attrs(module, mem_ctx, msg, attrs);
if (!msg2) {
return -1;
}
/* add to the results list */
res2 = talloc_realloc(mem_ctx, *res, struct ldb_message *, (*count)+2);
if (!res2) {
talloc_free(msg2);
return -1;
}
(*res) = res2;
(*res)[*count] = talloc_move(*res, &msg2);
(*res)[(*count)+1] = NULL;
(*count)++;
return 0;
}
/*
filter the specified list of attributes from a message
removing not requested attrs.
*/
int ltdb_filter_attrs(struct ldb_message *msg, const char * const *attrs)
{
int i, keep_all = 0;
if (attrs) {
/* check for special attrs */
for (i = 0; attrs[i]; i++) {
if (strcmp(attrs[i], "*") == 0) {
keep_all = 1;
break;
}
if (ldb_attr_cmp(attrs[i], "distinguishedName") == 0) {
if (msg_add_distinguished_name(msg) != 0) {
return -1;
}
}
}
} else {
keep_all = 1;
}
if (keep_all) {
if (msg_add_distinguished_name(msg) != 0) {
return -1;
}
return 0;
}
for (i = 0; i < msg->num_elements; i++) {
int j, found;
for (j = 0, found = 0; attrs[j]; j++) {
if (ldb_attr_cmp(msg->elements[i].name, attrs[j]) == 0) {
found = 1;
break;
}
}
if (!found) {
ldb_msg_remove_attr(msg, msg->elements[i].name);
i--;
}
}
return 0;
}
/*
search function for a non-indexed search
*/
static int search_func(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *state)
{
struct ltdb_context *ac;
struct ldb_message *msg;
int ret;
ac = talloc_get_type(state, struct ltdb_context);
if (key.dsize < 4 ||
strncmp((char *)key.dptr, "DN=", 3) != 0) {
return 0;
}
msg = ldb_msg_new(ac);
if (!msg) {
return -1;
}
/* unpack the record */
ret = ltdb_unpack_data(ac->module, &data, msg);
if (ret == -1) {
talloc_free(msg);
return -1;
}
if (!msg->dn) {
msg->dn = ldb_dn_new(msg, ac->module->ldb,
(char *)key.dptr + 3);
if (msg->dn == NULL) {
talloc_free(msg);
return -1;
}
}
/* see if it matches the given expression */
if (!ldb_match_msg(ac->module->ldb, msg,
ac->tree, ac->base, ac->scope)) {
talloc_free(msg);
return 0;
}
/* filter the attributes that the user wants */
ret = ltdb_filter_attrs(msg, ac->attrs);
if (ret == -1) {
talloc_free(msg);
return -1;
}
ret = ldb_module_send_entry(ac->req, msg);
if (ret != LDB_SUCCESS) {
ac->callback_failed = true;
/* the callback failed, abort the operation */
return -1;
}
return 0;
}
/*
search the database with a LDAP-like expression.
this is the "full search" non-indexed variant
*/
static int ltdb_search_full(struct ltdb_context *ctx)
{
struct ltdb_private *ltdb = talloc_get_type(ctx->module->private_data, struct ltdb_private);
int ret;
if (ltdb->in_transaction != 0) {
ret = tdb_traverse(ltdb->tdb, search_func, ctx);
} else {
ret = tdb_traverse_read(ltdb->tdb, search_func, ctx);
}
if (ret == -1) {
return LDB_ERR_OPERATIONS_ERROR;
}
return LDB_SUCCESS;
}
/*
search the database with a LDAP-like expression.
choses a search method
*/
int ltdb_search(struct ltdb_context *ctx)
{
struct ldb_module *module = ctx->module;
struct ldb_request *req = ctx->req;
struct ltdb_private *ltdb = talloc_get_type(module->private_data, struct ltdb_private);
int ret;
req->handle->state = LDB_ASYNC_PENDING;
if (ltdb_lock_read(module) != 0) {
return LDB_ERR_OPERATIONS_ERROR;
}
if (ltdb_cache_load(module) != 0) {
ltdb_unlock_read(module);
return LDB_ERR_OPERATIONS_ERROR;
}
if (req->op.search.tree == NULL) {
ltdb_unlock_read(module);
return LDB_ERR_OPERATIONS_ERROR;
}
if ((req->op.search.base == NULL) || (ldb_dn_is_null(req->op.search.base) == true)) {
/* Check what we should do with a NULL dn */
switch (req->op.search.scope) {
case LDB_SCOPE_BASE:
ldb_asprintf_errstring(module->ldb,
"NULL Base DN invalid for a base search");
ret = LDB_ERR_INVALID_DN_SYNTAX;
break;
case LDB_SCOPE_ONELEVEL:
ldb_asprintf_errstring(module->ldb,
"NULL Base DN invalid for a one-level search");
ret = LDB_ERR_INVALID_DN_SYNTAX;
break;
case LDB_SCOPE_SUBTREE:
default:
/* We accept subtree searches from a NULL base DN, ie over the whole DB */
ret = LDB_SUCCESS;
}
} else if (ldb_dn_is_valid(req->op.search.base) == false) {
/* We don't want invalid base DNs here */
ldb_asprintf_errstring(module->ldb,
"Invalid Base DN: %s",
ldb_dn_get_linearized(req->op.search.base));
ret = LDB_ERR_INVALID_DN_SYNTAX;
} else if (ltdb->check_base) {
/* This database has been marked as 'checkBaseOnSearch', so do a spot check of the base dn */
ret = ltdb_search_base(module, req->op.search.base);
if (ret == LDB_ERR_NO_SUCH_OBJECT) {
ldb_asprintf_errstring(module->ldb,
"No such Base DN: %s",
ldb_dn_get_linearized(req->op.search.base));
}
} else {
/* If we are not checking the base DN life is easy */
ret = LDB_SUCCESS;
}
ctx->tree = req->op.search.tree;
ctx->scope = req->op.search.scope;
ctx->base = req->op.search.base;
ctx->attrs = req->op.search.attrs;
if (ret == LDB_SUCCESS) {
ret = ltdb_search_indexed(ctx);
if (ret == LDB_ERR_NO_SUCH_OBJECT) {
/* Not in the index, therefore OK! */
ret = LDB_SUCCESS;
}
/* Check if we got just a normal error.
* In that case proceed to a full search unless we got a
* callback error */
if ( ! ctx->callback_failed && ret != LDB_SUCCESS) {
/* Not indexed, so we need to do a full scan */
ret = ltdb_search_full(ctx);
if (ret != LDB_SUCCESS) {
ldb_set_errstring(module->ldb, "Indexed and full searches both failed!\n");
}
}
}
ltdb_unlock_read(module);
return ret;
}
|