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/*
Samba4 module loading module
Copyright (C) Andrew Bartlett <abartlet@samba.org> 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: Samba4 module loading module
*
* Description: Implement a single 'module' in the ldb database,
* which loads the remaining modules based on 'choice of configuration' attributes
*
* This is to avoid forcing a reprovision of the ldb databases when we change the internal structure of the code
*
* Author: Andrew Bartlett
*/
#include "includes.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/ldb/include/ldb_module.h"
#include "lib/ldb/include/ldb_private.h"
#include "dsdb/samdb/ldb_modules/util.h"
#include "dsdb/samdb/samdb.h"
#include "librpc/ndr/libndr.h"
static int read_at_rootdse_record(struct ldb_context *ldb, struct ldb_module *module, TALLOC_CTX *mem_ctx,
struct ldb_message **msg)
{
int ret;
static const char *rootdse_attrs[] = { "defaultNamingContext", "configurationNamingContext", "schemaNamingContext", NULL };
struct ldb_result *rootdse_res;
struct ldb_dn *rootdse_dn;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return ldb_oom(ldb);
}
rootdse_dn = ldb_dn_new(tmp_ctx, ldb, "@ROOTDSE");
if (!rootdse_dn) {
talloc_free(tmp_ctx);
return ldb_oom(ldb);
}
ret = dsdb_module_search_dn(module, tmp_ctx, &rootdse_res, rootdse_dn,
rootdse_attrs, DSDB_FLAG_NEXT_MODULE);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return ret;
}
talloc_steal(mem_ctx, rootdse_res->msgs);
*msg = rootdse_res->msgs[0];
talloc_free(tmp_ctx);
return ret;
}
static int prepare_modules_line(struct ldb_context *ldb,
TALLOC_CTX *mem_ctx,
const struct ldb_message *rootdse_msg,
struct ldb_message *msg, const char *backend_attr,
const char *backend_mod, const char **backend_mod_list)
{
int ret;
const char **backend_full_list;
const char *backend_dn;
char *mod_list_string;
char *full_string;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return ldb_oom(ldb);
}
if (backend_attr) {
backend_dn = ldb_msg_find_attr_as_string(rootdse_msg, backend_attr, NULL);
if (!backend_dn) {
ldb_asprintf_errstring(ldb,
"samba_dsdb_init: "
"unable to read %s from %s:%s",
backend_attr, ldb_dn_get_linearized(rootdse_msg->dn),
ldb_errstring(ldb));
return LDB_ERR_CONSTRAINT_VIOLATION;
}
} else {
backend_dn = "*";
}
if (backend_mod) {
backend_full_list = (const char **)str_list_make_single(tmp_ctx, backend_mod);
} else {
backend_full_list = (const char **)str_list_make_empty(tmp_ctx);
}
if (!backend_full_list) {
talloc_free(tmp_ctx);
return ldb_oom(ldb);
}
backend_full_list = str_list_append_const(backend_full_list, backend_mod_list);
if (!backend_full_list) {
talloc_free(tmp_ctx);
return ldb_oom(ldb);
}
mod_list_string = str_list_join(tmp_ctx, backend_full_list, ',');
if (!mod_list_string) {
talloc_free(tmp_ctx);
return ldb_oom(ldb);
}
full_string = talloc_asprintf(tmp_ctx, "%s:%s", backend_dn, mod_list_string);
ret = ldb_msg_add_steal_string(msg, "modules", full_string);
talloc_free(tmp_ctx);
return ret;
}
static int samba_dsdb_init(struct ldb_module *module)
{
struct ldb_context *ldb = ldb_module_get_ctx(module);
int ret, len, i;
TALLOC_CTX *tmp_ctx = talloc_new(module);
struct ldb_result *res;
struct ldb_message *rootdse_msg, *partition_msg;
struct ldb_dn *samba_dsdb_dn;
struct ldb_module *backend_module, *module_chain;
const char **final_module_list, **reverse_module_list;
/*
Add modules to the list to activate them by default
beware often order is important
Some Known ordering constraints:
- rootdse must be first, as it makes redirects from "" -> cn=rootdse
- extended_dn_in must be before objectclass.c, as it resolves the DN
- objectclass must be before password_hash and samldb since these LDB
modules require the expanded "objectClass" list
- objectclass_attrs must be behind operational in order to see all
attributes (the operational module protects and therefore
suppresses per default some important ones)
- partition must be last
- each partition has its own module list then
The list is presented here as a set of declarations to show the
stack visually - the code below then handles the creation of the list
based on the parameters loaded from the database.
*/
static const char *modules_list[] = {"resolve_oids",
"rootdse",
"lazy_commit",
"paged_results",
"ranged_results",
"anr",
"server_sort",
"asq",
"extended_dn_store",
"extended_dn_in",
"objectclass",
"descriptor",
"acl",
"samldb",
"password_hash",
"operational",
"kludge_acl",
"schema_load",
"instancetype",
"objectclass_attrs",
NULL };
const char **link_modules;
static const char *fedora_ds_modules[] = {
"rdn_name", NULL };
static const char *openldap_modules[] = {
NULL };
static const char *tdb_modules_list[] = {
"rdn_name",
"subtree_delete",
"repl_meta_data",
"subtree_rename",
"linked_attributes",
NULL};
const char *extended_dn_module;
const char *extended_dn_module_ldb = "extended_dn_out_ldb";
const char *extended_dn_module_fds = "extended_dn_out_fds";
const char *extended_dn_module_openldap = "extended_dn_out_openldap";
static const char *modules_list2[] = {"show_deleted",
"new_partition",
"partition",
NULL };
const char **backend_modules;
static const char *fedora_ds_backend_modules[] = {
"nsuniqueid", "paged_searches", NULL };
static const char *openldap_backend_modules[] = {
"entryuuid", "paged_searches", NULL };
static const char *samba_dsdb_attrs[] = { "backendType", "serverRole", NULL };
const char *backendType, *serverRole;
if (!tmp_ctx) {
return ldb_oom(ldb);
}
samba_dsdb_dn = ldb_dn_new(tmp_ctx, ldb, "@SAMBA_DSDB");
if (!samba_dsdb_dn) {
talloc_free(tmp_ctx);
return ldb_oom(ldb);
}
#define CHECK_LDB_RET(check_ret) \
do { \
if (check_ret != LDB_SUCCESS) { \
talloc_free(tmp_ctx); \
return check_ret; \
} \
} while (0)
ret = dsdb_module_search_dn(module, tmp_ctx, &res, samba_dsdb_dn,
samba_dsdb_attrs, DSDB_FLAG_NEXT_MODULE);
if (ret == LDB_ERR_NO_SUCH_OBJECT) {
backendType = "ldb";
serverRole = "domain controller";
} else if (ret == LDB_SUCCESS) {
backendType = ldb_msg_find_attr_as_string(res->msgs[0], "backendType", "ldb");
serverRole = ldb_msg_find_attr_as_string(res->msgs[0], "serverRole", "domain controller");
} else {
talloc_free(tmp_ctx);
return ret;
}
backend_modules = NULL;
if (strcasecmp(backendType, "ldb") == 0) {
extended_dn_module = extended_dn_module_ldb;
link_modules = tdb_modules_list;
} else {
if (strcasecmp(backendType, "fedora-ds") == 0) {
link_modules = fedora_ds_modules;
backend_modules = fedora_ds_backend_modules;
extended_dn_module = extended_dn_module_fds;
} else if (strcasecmp(backendType, "openldap") == 0) {
link_modules = openldap_modules;
backend_modules = openldap_backend_modules;
extended_dn_module = extended_dn_module_openldap;
}
}
#define CHECK_MODULE_LIST \
do { \
if (!final_module_list) { \
talloc_free(tmp_ctx); \
return ldb_oom(ldb); \
} \
} while (0)
final_module_list = str_list_copy_const(tmp_ctx, modules_list);
CHECK_MODULE_LIST;
final_module_list = str_list_append_const(final_module_list, link_modules);
CHECK_MODULE_LIST;
final_module_list = str_list_add_const(final_module_list, extended_dn_module);
CHECK_MODULE_LIST;
final_module_list = str_list_append_const(final_module_list, modules_list2);
CHECK_MODULE_LIST;
ret = read_at_rootdse_record(ldb, module, tmp_ctx, &rootdse_msg);
CHECK_LDB_RET(ret);
partition_msg = ldb_msg_new(tmp_ctx);
partition_msg->dn = ldb_dn_new(partition_msg, ldb, "@" DSDB_OPAQUE_PARTITION_MODULE_MSG_OPAQUE_NAME);
ret = prepare_modules_line(ldb, tmp_ctx,
rootdse_msg,
partition_msg, "defaultNamingContext",
"pdc_fsmo", backend_modules);
CHECK_LDB_RET(ret);
ret = prepare_modules_line(ldb, tmp_ctx,
rootdse_msg,
partition_msg, "configurationNamingContext",
"naming_fsmo", backend_modules);
CHECK_LDB_RET(ret);
ret = prepare_modules_line(ldb, tmp_ctx,
rootdse_msg,
partition_msg, "schemaNamingContext",
"schema_data", backend_modules);
CHECK_LDB_RET(ret);
ret = prepare_modules_line(ldb, tmp_ctx,
rootdse_msg,
partition_msg, NULL,
NULL, backend_modules);
CHECK_LDB_RET(ret);
ret = ldb_set_opaque(ldb, DSDB_OPAQUE_PARTITION_MODULE_MSG_OPAQUE_NAME, partition_msg);
CHECK_LDB_RET(ret);
talloc_steal(ldb, partition_msg);
/* Now prepare the module chain. Oddly, we must give it to ldb_load_modules_list in REVERSE */
for (len = 0; final_module_list[len]; len++) { /* noop */};
reverse_module_list = talloc_array(tmp_ctx, const char *, len+1);
if (!reverse_module_list) {
talloc_free(tmp_ctx);
return ldb_oom(ldb);
}
for (i=0; i < len; i++) {
reverse_module_list[i] = final_module_list[(len - 1) - i];
}
reverse_module_list[i] = NULL;
/* The backend (at least until the partitions module
* reconfigures things) is the next module in the currently
* loaded chain */
backend_module = module->next;
ret = ldb_load_modules_list(ldb, reverse_module_list, backend_module, &module_chain);
CHECK_LDB_RET(ret);
talloc_free(tmp_ctx);
/* Set this as the 'next' module, so that we effectivly append it to module chain */
module->next = module_chain;
return ldb_next_init(module);
}
_PUBLIC_ const struct ldb_module_ops ldb_samba_dsdb_module_ops = {
.name = "samba_dsdb",
.init_context = samba_dsdb_init,
};
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