int ldb_load_modules(struct ldb_context *ldb, const char *options[]) { const char **modules = NULL; int i; int ret; TALLOC_CTX *mem_ctx = talloc_new(ldb); if (!mem_ctx) { return LDB_ERR_OPERATIONS_ERROR; } /* find out which modules we are requested to activate */ /* check if we have a custom module list passd as ldb option */ if (options) { for (i = 0; options[i] != NULL; i++) { if (strncmp(options[i], LDB_MODULE_PREFIX, LDB_MODULE_PREFIX_LEN) == 0) { modules = ldb_modules_list_from_string(ldb, mem_ctx, &options[i][LDB_MODULE_PREFIX_LEN]); } } } /* if not overloaded by options and the backend is not ldap try to load the modules list from ldb */ if ((modules == NULL) && (strcmp("ldap", ldb->modules->ops->name) != 0)) { const char * const attrs[] = { "@LIST" , NULL}; struct ldb_result *res = NULL; struct ldb_dn *mods_dn; mods_dn = ldb_dn_new(mem_ctx, ldb, "@MODULES"); if (mods_dn == NULL) { talloc_free(mem_ctx); return -1; } ret = ldb_search(ldb, mods_dn, LDB_SCOPE_BASE, "", attrs, &res); talloc_steal(mods_dn, res); if (ret == LDB_SUCCESS && (res->count == 0 || res->msgs[0]->num_elements == 0)) { ldb_debug(ldb, LDB_DEBUG_TRACE, "no modules required by the db\n"); } else { if (ret != LDB_SUCCESS) { ldb_debug(ldb, LDB_DEBUG_FATAL, "ldb error (%s) occurred searching for modules, bailing out\n", ldb_errstring(ldb)); talloc_free(mem_ctx); return -1; } if (res->count > 1) { ldb_debug(ldb, LDB_DEBUG_FATAL, "Too many records found (%d), bailing out\n", res->count); talloc_free(mem_ctx); return -1; } modules = ldb_modules_list_from_string(ldb, mem_ctx, (const char *)res->msgs[0]->elements[0].values[0].data); } talloc_free(mods_dn); } if (modules != NULL) { ret = ldb_load_modules_list(ldb, modules, ldb->modules, &ldb->modules); talloc_free(modules); if (ret != LDB_SUCCESS) { return ret; } } else { ldb_debug(ldb, LDB_DEBUG_TRACE, "No modules specified for this database\n"); } return ldb_init_module_chain(ldb, ldb->modules); }
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_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) { 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_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) { 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") == 0) { backend_modules = fedora_ds_backend_modules; extended_dn_module = extended_dn_module_fds; } else if (strcasecmp(backendType, "openldap") == 0) { 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); }