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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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Name: ldb
*
* Component: ldb ldap backend
*
* Description: core files for LDAP backend
*
* Author: Andrew Tridgell
*/
#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_errors.h"
#include "ldb/include/ldb_private.h"
#include "ldb/ldb_ldap/ldb_ldap.h"
/*
rename a record
*/
static int lldb_rename(struct ldb_module *module, const struct ldb_dn *olddn, const struct ldb_dn *newdn)
{
TALLOC_CTX *local_ctx;
struct lldb_private *lldb = module->private_data;
int ret = 0;
char *old_dn;
char *newrdn;
const char *parentdn = "";
/* ignore ltdb specials */
if (ldb_dn_is_special(olddn) || ldb_dn_is_special(newdn)) {
return 0;
}
local_ctx = talloc_named(lldb, 0, "lldb_rename local context");
if (local_ctx == NULL) {
return -1;
}
old_dn = ldb_dn_linearize(local_ctx, olddn);
if (old_dn == NULL) {
goto failed;
}
newrdn = talloc_asprintf(lldb, "%s=%s",
newdn->components[0].name,
ldb_dn_escape_value(lldb, newdn->components[0].value));
if (!newrdn) {
goto failed;
}
parentdn = ldb_dn_linearize(lldb, ldb_dn_get_parent(lldb, newdn));
if (!parentdn) {
goto failed;
}
lldb->last_rc = ldap_rename_s(lldb->ldap, old_dn, newrdn, parentdn, 1, NULL, NULL);
if (lldb->last_rc != LDAP_SUCCESS) {
ldb_set_errstring(module, talloc_strdup(module, ldap_err2string(lldb->last_rc)));
ret = -1;
}
talloc_free(local_ctx);
return ret;
failed:
talloc_free(local_ctx);
return -1;
}
/*
delete a record
*/
static int lldb_delete(struct ldb_module *module, const struct ldb_dn *edn)
{
struct lldb_private *lldb = module->private_data;
char *dn;
int ret = 0;
/* ignore ltdb specials */
if (ldb_dn_is_special(edn)) {
return 0;
}
dn = ldb_dn_linearize(lldb, edn);
lldb->last_rc = ldap_delete_s(lldb->ldap, dn);
if (lldb->last_rc != LDAP_SUCCESS) {
ldb_set_errstring(module, talloc_strdup(module, ldap_err2string(lldb->last_rc)));
ret = -1;
}
talloc_free(dn);
return ret;
}
/*
add a single set of ldap message values to a ldb_message
*/
static int lldb_add_msg_attr(struct ldb_context *ldb,
struct ldb_message *msg,
const char *attr, struct berval **bval)
{
int count, i;
struct ldb_message_element *el;
count = ldap_count_values_len(bval);
if (count <= 0) {
return -1;
}
el = talloc_realloc(msg, msg->elements, struct ldb_message_element,
msg->num_elements + 1);
if (!el) {
errno = ENOMEM;
return -1;
}
msg->elements = el;
el = &msg->elements[msg->num_elements];
el->name = talloc_strdup(msg->elements, attr);
if (!el->name) {
errno = ENOMEM;
return -1;
}
el->flags = 0;
el->num_values = 0;
el->values = talloc_array(msg->elements, struct ldb_val, count);
if (!el->values) {
errno = ENOMEM;
return -1;
}
for (i=0;i<count;i++) {
el->values[i].data = talloc_memdup(el->values, bval[i]->bv_val, bval[i]->bv_len);
if (!el->values[i].data) {
return -1;
}
el->values[i].length = bval[i]->bv_len;
el->num_values++;
}
msg->num_elements++;
return 0;
}
/*
search for matching records
*/
static int lldb_search_bytree(struct ldb_module *module, const struct ldb_dn *base,
enum ldb_scope scope, struct ldb_parse_tree *tree,
const char * const *attrs, struct ldb_result **res)
{
struct ldb_context *ldb = module->ldb;
struct lldb_private *lldb = module->private_data;
int count, msg_count, ldap_scope;
char *search_base;
LDAPMessage *ldapres, *msg;
char *expression;
search_base = ldb_dn_linearize(ldb, base);
if (base == NULL) {
search_base = talloc_strdup(ldb, "");
}
if (search_base == NULL) {
return -1;
}
expression = ldb_filter_from_tree(search_base, tree);
if (expression == NULL) {
talloc_free(search_base);
return -1;
}
switch (scope) {
case LDB_SCOPE_BASE:
ldap_scope = LDAP_SCOPE_BASE;
break;
case LDB_SCOPE_ONELEVEL:
ldap_scope = LDAP_SCOPE_ONELEVEL;
break;
default:
ldap_scope = LDAP_SCOPE_SUBTREE;
break;
}
(*res) = talloc(lldb, struct ldb_result);
if (! *res) {
errno = ENOMEM;
return LDB_ERR_OTHER;
}
(*res)->count = 0;
(*res)->msgs = NULL;
(*res)->controls = NULL;
lldb->last_rc = ldap_search_s(lldb->ldap, search_base, ldap_scope,
expression,
discard_const_p(char *, attrs),
0, &ldapres);
talloc_free(search_base);
if (lldb->last_rc != LDAP_SUCCESS) {
ldb_set_errstring(module, talloc_strdup(module, ldap_err2string(lldb->last_rc)));
return lldb->last_rc;
}
count = ldap_count_entries(lldb->ldap, ldapres);
if (count == -1 || count == 0) {
ldap_msgfree(ldapres);
return LDB_SUCCESS;
}
(*res)->msgs = talloc_array(*res, struct ldb_message *, count+1);
if (! (*res)->msgs) {
ldap_msgfree(ldapres);
talloc_free(*res);
errno = ENOMEM;
return LDB_ERR_OTHER;
}
(*res)->msgs[0] = NULL;
msg_count = 0;
/* loop over all messages */
for (msg=ldap_first_entry(lldb->ldap, ldapres);
msg;
msg=ldap_next_entry(lldb->ldap, msg)) {
BerElement *berptr = NULL;
char *attr, *dn;
if (msg_count == count) {
/* hmm, got too many? */
ldb_debug(ldb, LDB_DEBUG_FATAL, "Fatal: ldap message count inconsistent\n");
break;
}
(*res)->msgs[msg_count] = talloc((*res)->msgs, struct ldb_message);
if (!(*res)->msgs[msg_count]) {
goto failed;
}
(*res)->msgs[msg_count+1] = NULL;
dn = ldap_get_dn(lldb->ldap, msg);
if (!dn) {
goto failed;
}
(*res)->msgs[msg_count]->dn = ldb_dn_explode_or_special((*res)->msgs[msg_count], dn);
ldap_memfree(dn);
if (!(*res)->msgs[msg_count]->dn) {
goto failed;
}
(*res)->msgs[msg_count]->num_elements = 0;
(*res)->msgs[msg_count]->elements = NULL;
(*res)->msgs[msg_count]->private_data = NULL;
/* loop over all attributes */
for (attr=ldap_first_attribute(lldb->ldap, msg, &berptr);
attr;
attr=ldap_next_attribute(lldb->ldap, msg, berptr)) {
struct berval **bval;
bval = ldap_get_values_len(lldb->ldap, msg, attr);
if (bval) {
lldb_add_msg_attr(ldb, (*res)->msgs[msg_count], attr, bval);
ldap_value_free_len(bval);
}
ldap_memfree(attr);
}
if (berptr) ber_free(berptr, 0);
msg_count++;
}
ldap_msgfree(ldapres);
(*res)->count = msg_count;
return LDB_SUCCESS;
failed:
if (*res) talloc_free(*res);
return LDB_ERR_OTHER;
}
/*
convert a ldb_message structure to a list of LDAPMod structures
ready for ldap_add() or ldap_modify()
*/
static LDAPMod **lldb_msg_to_mods(struct ldb_context *ldb,
const struct ldb_message *msg, int use_flags)
{
LDAPMod **mods;
unsigned int i, j;
int num_mods = 0;
/* allocate maximum number of elements needed */
mods = talloc_array(ldb, LDAPMod *, msg->num_elements+1);
if (!mods) {
errno = ENOMEM;
return NULL;
}
mods[0] = NULL;
for (i=0;i<msg->num_elements;i++) {
const struct ldb_message_element *el = &msg->elements[i];
mods[num_mods] = talloc(ldb, LDAPMod);
if (!mods[num_mods]) {
goto failed;
}
mods[num_mods+1] = NULL;
mods[num_mods]->mod_op = LDAP_MOD_BVALUES;
if (use_flags) {
switch (el->flags & LDB_FLAG_MOD_MASK) {
case LDB_FLAG_MOD_ADD:
mods[num_mods]->mod_op |= LDAP_MOD_ADD;
break;
case LDB_FLAG_MOD_DELETE:
mods[num_mods]->mod_op |= LDAP_MOD_DELETE;
break;
case LDB_FLAG_MOD_REPLACE:
mods[num_mods]->mod_op |= LDAP_MOD_REPLACE;
break;
}
}
mods[num_mods]->mod_type = discard_const_p(char, el->name);
mods[num_mods]->mod_vals.modv_bvals = talloc_array(mods[num_mods],
struct berval *,
1+el->num_values);
if (!mods[num_mods]->mod_vals.modv_bvals) {
goto failed;
}
for (j=0;j<el->num_values;j++) {
mods[num_mods]->mod_vals.modv_bvals[j] = talloc(mods[num_mods]->mod_vals.modv_bvals,
struct berval);
if (!mods[num_mods]->mod_vals.modv_bvals[j]) {
goto failed;
}
mods[num_mods]->mod_vals.modv_bvals[j]->bv_val = el->values[j].data;
mods[num_mods]->mod_vals.modv_bvals[j]->bv_len = el->values[j].length;
}
mods[num_mods]->mod_vals.modv_bvals[j] = NULL;
num_mods++;
}
return mods;
failed:
talloc_free(mods);
return NULL;
}
/*
add a record
*/
static int lldb_add(struct ldb_module *module, const struct ldb_message *msg)
{
struct ldb_context *ldb = module->ldb;
struct lldb_private *lldb = module->private_data;
LDAPMod **mods;
char *dn;
int ret = 0;
/* ignore ltdb specials */
if (ldb_dn_is_special(msg->dn)) {
return 0;
}
mods = lldb_msg_to_mods(ldb, msg, 0);
if (mods == NULL) {
return -1;
}
dn = ldb_dn_linearize(mods, msg->dn);
if (dn == NULL) {
talloc_free(mods);
return -1;
}
lldb->last_rc = ldap_add_s(lldb->ldap, dn, mods);
if (lldb->last_rc != LDAP_SUCCESS) {
ldb_set_errstring(module, talloc_strdup(module, ldap_err2string(lldb->last_rc)));
ret = -1;
}
talloc_free(mods);
return ret;
}
/*
modify a record
*/
static int lldb_modify(struct ldb_module *module, const struct ldb_message *msg)
{
struct ldb_context *ldb = module->ldb;
struct lldb_private *lldb = module->private_data;
LDAPMod **mods;
char *dn;
int ret = 0;
/* ignore ltdb specials */
if (ldb_dn_is_special(msg->dn)) {
return 0;
}
mods = lldb_msg_to_mods(ldb, msg, 1);
if (mods == NULL) {
return -1;
}
dn = ldb_dn_linearize(mods, msg->dn);
if (dn == NULL) {
talloc_free(mods);
return -1;
}
lldb->last_rc = ldap_modify_s(lldb->ldap, dn, mods);
if (lldb->last_rc != LDAP_SUCCESS) {
ldb_set_errstring(module, talloc_strdup(module, ldap_err2string(lldb->last_rc)));
ret = -1;
}
talloc_free(mods);
return ret;
}
static int lldb_start_trans(struct ldb_module *module)
{
/* TODO implement a local transaction mechanism here */
return 0;
}
static int lldb_end_trans(struct ldb_module *module)
{
/* TODO implement a local transaction mechanism here */
return 0;
}
static int lldb_del_trans(struct ldb_module *module)
{
/* TODO implement a local transaction mechanism here */
return 0;
}
static int lldb_request(struct ldb_module *module, struct ldb_request *req)
{
switch (req->operation) {
case LDB_REQ_SEARCH:
return lldb_search_bytree(module,
req->op.search.base,
req->op.search.scope,
req->op.search.tree,
req->op.search.attrs,
req->op.search.res);
case LDB_REQ_ADD:
return lldb_add(module, req->op.add.message);
case LDB_REQ_MODIFY:
return lldb_modify(module, req->op.mod.message);
case LDB_REQ_DELETE:
return lldb_delete(module, req->op.del.dn);
case LDB_REQ_RENAME:
return lldb_rename(module,
req->op.rename.olddn,
req->op.rename.newdn);
default:
return -1;
}
}
static int lldb_init_2(struct ldb_module *module)
{
return LDB_SUCCESS;
}
static const struct ldb_module_ops lldb_ops = {
.name = "ldap",
.request = lldb_request,
.start_transaction = lldb_start_trans,
.end_transaction = lldb_end_trans,
.del_transaction = lldb_del_trans,
.second_stage_init = lldb_init_2
};
static int lldb_destructor(void *p)
{
struct lldb_private *lldb = p;
ldap_unbind(lldb->ldap);
return 0;
}
/*
connect to the database
*/
int lldb_connect(struct ldb_context *ldb,
const char *url,
unsigned int flags,
const char *options[])
{
struct lldb_private *lldb = NULL;
int version = 3;
lldb = talloc(ldb, struct lldb_private);
if (!lldb) {
ldb_oom(ldb);
goto failed;
}
lldb->ldap = NULL;
lldb->options = NULL;
lldb->last_rc = ldap_initialize(&lldb->ldap, url);
if (lldb->last_rc != LDAP_SUCCESS) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "ldap_initialize failed for URL '%s' - %s\n",
url, ldap_err2string(lldb->last_rc));
goto failed;
}
talloc_set_destructor(lldb, lldb_destructor);
lldb->last_rc = ldap_set_option(lldb->ldap, LDAP_OPT_PROTOCOL_VERSION, &version);
if (lldb->last_rc != LDAP_SUCCESS) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "ldap_set_option failed - %s\n",
ldap_err2string(lldb->last_rc));
}
ldb->modules = talloc(ldb, struct ldb_module);
if (!ldb->modules) {
ldb_oom(ldb);
goto failed;
}
ldb->modules->ldb = ldb;
ldb->modules->prev = ldb->modules->next = NULL;
ldb->modules->private_data = lldb;
ldb->modules->ops = &lldb_ops;
return 0;
failed:
talloc_free(lldb);
return -1;
}
|