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s4:dsdb Move module configuration from each ldb into samba_dsdb.c

Browse Source 
This makes getting the module order correct, the obligation of Samba4
developers, and not system administrators.  In particular, once an ldb
is updated to use only the 'samba_dsdb' module, no further changes to the
ldb should be required when upgrading to later Samba4 versions.

(thanks to metze for the suggestion of samba_dsdb as a long-term
stable name for the module)

Andrew Bartlett
This commit is contained in:
Andrew Bartlett 2009-11-23 20:30:35 +11:00 committed by Stefan Metzmacher
parent e297af00fa
commit 401ba9c9cf
8 changed files with 408 additions and 86 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
source4/dsdb/samdb/ldb_modules/config.mk
View File

@ -8,6 +8,17 @@ DSDB_MODULE_HELPERS_OBJ_FILES = $(dsdbsrcdir)/samdb/ldb_modules/util.o
$(eval $(call proto_header_template,$(dsdbsrcdir)/samdb/ldb_modules/util_proto.h,$(DSDB_MODULE_HELPERS_OBJ_FILES:.o=.c)))
################################################
# Start MODULE ldb_samba_dsdb
[MODULE::ldb_samba_dsdb]
SUBSYSTEM = LIBLDB
PRIVATE_DEPENDENCIES = SAMDB LIBTALLOC LIBEVENTS LIBNDR
INIT_FUNCTION = LDB_MODULE(samba_dsdb)
# End MODULE ldb_samba_dsdb
################################################
ldb_samba_dsdb_OBJ_FILES = $(dsdbsrcdir)/samdb/ldb_modules/samba_dsdb.o
################################################
# Start MODULE ldb_objectguid
[MODULE::ldb_objectguid]

2
source4/dsdb/samdb/ldb_modules/partition.h
View File

@ -47,6 +47,8 @@ struct partition_private_data {
uint64_t metadata_seq;
uint32_t in_transaction;
struct ldb_message *forced_module_msg;
};
#include "dsdb/samdb/ldb_modules/partition_proto.h"

27
source4/dsdb/samdb/ldb_modules/partition_init.c
View File

@ -129,7 +129,7 @@ static int partition_load_modules(struct ldb_context *ldb,
static int partition_reload_metadata(struct ldb_module *module, struct partition_private_data *data, TALLOC_CTX *mem_ctx, struct ldb_message **_msg)
{
int ret;
struct ldb_message *msg;
struct ldb_message *msg, *module_msg;
struct ldb_result *res;
struct ldb_context *ldb = ldb_module_get_ctx(module);
const char *attrs[] = { "partition", "replicateEntries", "modules", "ldapBackend", NULL };
@ -148,7 +148,16 @@ static int partition_reload_metadata(struct ldb_module *module, struct partition
return ret;
}
ret = partition_load_modules(ldb, data, msg);
/* When used from Samba4, this message is set by the samba4
* module, as a fixed value not read from the DB. This avoids
* listing modules in the DB */
if (data->forced_module_msg) {
module_msg = data->forced_module_msg;
} else {
module_msg = msg;
}
ret = partition_load_modules(ldb, data, module_msg);
if (ret != LDB_SUCCESS) {
return ret;
}
@ -790,7 +799,7 @@ int partition_init(struct ldb_module *module)
{
int ret;
TALLOC_CTX *mem_ctx = talloc_new(module);
struct ldb_context *ldb = ldb_module_get_ctx(module);
struct partition_private_data *data;
if (!mem_ctx) {
@ -802,6 +811,14 @@ int partition_init(struct ldb_module *module)
return LDB_ERR_OPERATIONS_ERROR;
}
/* When used from Samba4, this message is set by the samba4
* module, as a fixed value not read from the DB. This avoids
* listing modules in the DB */
data->forced_module_msg = talloc_get_type(
ldb_get_opaque(ldb,
DSDB_OPAQUE_PARTITION_MODULE_MSG_OPAQUE_NAME),
struct ldb_message);
/* This loads the partitions */
ret = partition_reload_if_required(module, data);
if (ret != LDB_SUCCESS) {
@ -813,14 +830,14 @@ int partition_init(struct ldb_module *module)
ret = ldb_mod_register_control(module, LDB_CONTROL_DOMAIN_SCOPE_OID);
if (ret != LDB_SUCCESS) {
ldb_debug(ldb_module_get_ctx(module), LDB_DEBUG_ERROR,
ldb_debug(ldb, LDB_DEBUG_ERROR,
"partition: Unable to register control with rootdse!\n");
return LDB_ERR_OPERATIONS_ERROR;
}
ret = ldb_mod_register_control(module, LDB_CONTROL_SEARCH_OPTIONS_OID);
if (ret != LDB_SUCCESS) {
ldb_debug(ldb_module_get_ctx(module), LDB_DEBUG_ERROR,
ldb_debug(ldb, LDB_DEBUG_ERROR,
"partition: Unable to register control with rootdse!\n");
return LDB_ERR_OPERATIONS_ERROR;
}

360
source4/dsdb/samdb/ldb_modules/samba_dsdb.c Normal file
View File

@ -0,0 +1,360 @@
/*
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"
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) {
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
rootdse_dn = ldb_dn_new(tmp_ctx, ldb, "@ROOTDSE");
if (!rootdse_dn) {
talloc_free(tmp_ctx);
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
ret = dsdb_module_search_dn(module, tmp_ctx, &rootdse_res, rootdse_dn, rootdse_attrs, 0);
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) {
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
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);
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
backend_full_list = str_list_append_const(backend_full_list, backend_mod_list);
if (!backend_full_list) {
talloc_free(tmp_ctx);
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
mod_list_string = str_list_join(tmp_ctx, backend_full_list, ',');
if (!mod_list_string) {
talloc_free(tmp_ctx);
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
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, because password_hash checks
that the objectclass is of type person (filled in by objectclass
module when expanding the objectclass list)
- 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",
"rdn_name",
"objectclass",
"descriptor",
"acl",
"samldb",
"password_hash",
"operational",
"kludge_acl",
"schema_load",
"instancetype",
NULL };
const char *objectguid_module;
/* if serverrole == "domain controller": */
const char *repl_meta_data = "repl_meta_data";
/* else: */
const char *objectguid = "objectguid";
const char **link_modules;
static const char *tdb_modules_list[] = {
"subtree_rename",
"subtree_delete",
"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_ldb";
const char *extended_dn_module_openldap = "extended_dn_out_ldb";
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[] = {
"nsuniqueid", "paged_searches", NULL };
static const char *samba_dsdb_attrs[] = { "backendType", "serverRole", NULL };
const char *backendType, *serverRole;
if (!tmp_ctx) {
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
samba_dsdb_dn = ldb_dn_new(tmp_ctx, ldb, "@SAMBA_DSDB");
if (!samba_dsdb_dn) {
talloc_free(tmp_ctx);
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
#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, 0);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return ret;
}
backendType = ldb_msg_find_attr_as_string(res->msgs[0], "backendType", "ldb");
serverRole = ldb_msg_find_attr_as_string(res->msgs[0], "serverRole", NULL);
backend_modules = NULL;
if (strcasecmp(backendType, "ldb") == 0) {
if (strcasecmp(serverRole, "dc") == 0 || strcasecmp(serverRole, "domain controller") == 0) {
objectguid_module = repl_meta_data;
} else {
objectguid_module = objectguid;
}
extended_dn_module = extended_dn_module_ldb;
link_modules = tdb_modules_list;
} else {
objectguid_module = NULL;
link_modules = NULL;
if (strcasecmp(backendType, "fedora-ds")) {
backend_modules = fedora_ds_backend_modules;
extended_dn_module = extended_dn_module_fds;
} else if (strcasecmp(backendType, "openldap")) {
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); \
ldb_oom(ldb); \
return LDB_ERR_OPERATIONS_ERROR; \
} \
} while (0)
final_module_list = str_list_copy_const(tmp_ctx, modules_list);
CHECK_MODULE_LIST;
final_module_list = str_list_add_const(final_module_list, objectguid_module);
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);
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
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);
}
const struct ldb_module_ops ldb_samba_dsdb_module_ops = {
.name = "samba_dsdb",
.init_context = samba_dsdb_init,
};

2
source4/dsdb/samdb/samdb.h
View File

@ -140,4 +140,6 @@ struct dsdb_extended_dn_store_format {
bool store_extended_dn_in_ldb;
};
#define DSDB_OPAQUE_PARTITION_MODULE_MSG_OPAQUE_NAME "DSDB_OPAQUE_PARTITION_MODULE_MSG"
#endif /* __SAMDB_H__ */

79
source4/scripting/python/samba/provision.py
View File

@ -549,78 +549,9 @@ def setup_samdb_partitions(samdb_path, setup_path, message, lp, session_info,
samdb = Ldb(url=samdb_path, session_info=session_info,
lp=lp, options=["modules:"])
#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, because password_hash checks
# that the objectclass is of type person (filled in by objectclass
# module when expanding the objectclass list)
# - partition must be last
# - each partition has its own module list then
modules_list = ["resolve_oids",
"rootdse",
"lazy_commit",
"paged_results",
"ranged_results",
"anr",
"server_sort",
"asq",
"extended_dn_store",
"extended_dn_in",
"rdn_name",
"objectclass",
"descriptor",
"acl",
"samldb",
"password_hash",
"operational",
"kludge_acl",
"schema_load",
"instancetype"]
if serverrole == "domain controller":
objectguid_module = "repl_meta_data"
else:
objectguid_module = "objectguid"
tdb_modules_list = [
"subtree_rename",
"subtree_delete",
"linked_attributes"]
extended_dn_module = "extended_dn_out_ldb"
modules_list2 = ["show_deleted",
"new_partition",
"partition"]
backend_modules = []
ldap_backend_line = "# No LDAP backend"
if provision_backend.type is not "ldb":
ldap_backend_line = "ldapBackend: %s" % provision_backend.ldapi_uri
# The LDAP backends assign the objectGUID on thier own
objectguid_module = None
# OpenLDAP and FDS handles subtree renames, so we don't want to do any of these things
tdb_modules_list = []
if provision_backend.ldap_backend_type == "fedora-ds":
backend_modules = ["nsuniqueid", "paged_searches"]
extended_dn_module_list = ["extended_dn_out_fds"];
elif provision_backend.ldap_backend_type == "openldap":
backend_modules = ["entryuuid", "paged_searches"]
extended_dn_module_list = ["extended_dn_out_openldap"]
if objectguid_module is not None:
modules_list.append(objectguid_module)
for m in tdb_modules_list:
modules_list.append(m)
modules_list.append(extended_dn_module)
for m in modules_list2:
modules_list.append(m)
samdb.transaction_start()
try:
@ -629,16 +560,14 @@ def setup_samdb_partitions(samdb_path, setup_path, message, lp, session_info,
"SCHEMADN": ldb.Dn(schema.ldb, names.schemadn).get_casefold(),
"CONFIGDN": ldb.Dn(schema.ldb, names.configdn).get_casefold(),
"DOMAINDN": ldb.Dn(schema.ldb, names.domaindn).get_casefold(),
"SCHEMADN_MOD": "schema_data",
"CONFIGDN_MOD": "naming_fsmo",
"DOMAINDN_MOD": "pdc_fsmo",
"MODULES_LIST": ",".join(modules_list),
"BACKEND_MOD": ",".join(backend_modules),
"LDAP_BACKEND_LINE": ldap_backend_line,
})
samdb.load_ldif_file_add(setup_path("provision_init.ldif"))
setup_add_ldif(samdb, setup_path("provision_init.ldif"), {
"BACKEND_TYPE": provision_backend.type,
"SERVER_ROLE": serverrole
})
message("Setting up sam.ldb rootDSE")
setup_samdb_rootdse(samdb, setup_path, names)

7
source4/setup/provision_init.ldif
View File

@ -20,3 +20,10 @@ passwordAttribute: initialAuthIncoming
dn: @OPTIONS
checkBaseOnSearch: TRUE
dn: @SAMBA_DSDB
backendType: ${BACKEND_TYPE}
serverRole: ${SERVER_ROLE}
dn: @MODULES
@LIST: samba_dsdb

6
source4/setup/provision_partitions.ldif
View File

@ -2,11 +2,5 @@ dn: @PARTITION
replicateEntries: @ATTRIBUTES
replicateEntries: @INDEXLIST
replicateEntries: @OPTIONS
modules:${SCHEMADN}:${SCHEMADN_MOD},${BACKEND_MOD}
modules:${CONFIGDN}:${CONFIGDN_MOD},${BACKEND_MOD}
modules:${DOMAINDN}:${DOMAINDN_MOD},${BACKEND_MOD}
modules:*:${BACKEND_MOD}
${LDAP_BACKEND_LINE}
dn: @MODULES
@LIST: ${MODULES_LIST}