r20771: add an ldb module which will force the Schema FSMO Role Owner

constraints and it also loads the dsdb_schema at startup.

currently it only loads the dsdb_schema

metze
(This used to be commit d78de0fb68f8b4ef4c5372f3c3ed171e44cf2037)

1 files changed, 225 insertions, 0 deletions

diff --git a/source4/dsdb/samdb/ldb_modules/schema_fsmo.c b/source4/dsdb/samdb/ldb_modules/schema_fsmo.c
new file mode 100644
index 0000000000..1a83e3a9bf
--- /dev/null
+++ b/source4/dsdb/samdb/ldb_modules/schema_fsmo.c
@@ -0,0 +1,225 @@
+/* 
+   Unix SMB/CIFS mplementation.
+
+   The module that handles the Schema FSMO Role Owner
+   checkings, it also loads the dsdb_schema.
+   
+   Copyright (C) Stefan Metzmacher 2007
+    
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+   
+*/
+
+#include "includes.h"
+#include "lib/ldb/include/ldb.h"
+#include "lib/ldb/include/ldb_errors.h"
+#include "lib/ldb/include/ldb_private.h"
+#include "dsdb/samdb/samdb.h"
+#include "librpc/gen_ndr/ndr_misc.h"
+#include "librpc/gen_ndr/ndr_drsuapi.h"
+#include "librpc/gen_ndr/ndr_drsblobs.h"
+#include "lib/util/dlinklist.h"
+
+static int schema_fsmo_init(struct ldb_module *module)
+{
+	WERROR status;
+	TALLOC_CTX *mem_ctx;
+	struct ldb_dn *schema_dn;
+	struct dsdb_schema *schema;
+	struct ldb_result *schema_res;
+	const struct ldb_val *prefix_val;
+	const struct ldb_val *info_val;
+	struct ldb_result *a_res;
+	struct ldb_result *c_res;
+	uint32_t i;
+	int ret;
+	static const char *schema_attrs[] = {
+		"prefixMap",
+		"schemaInfo",
+		NULL
+	};
+
+	schema_dn = samdb_schema_dn(module->ldb);
+	if (!schema_dn) {
+		ldb_debug(module->ldb, LDB_DEBUG_TRACE,
+			  "schema_fsmo_init: no schema dn present: (skip schema loading)");
+		return ldb_next_init(module);
+	}
+
+	mem_ctx = talloc_new(module);
+	if (!mem_ctx) {
+		ldb_oom(module->ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	schema = talloc_zero(mem_ctx, struct dsdb_schema);
+	if (!schema) {
+		ldb_oom(module->ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	/*
+	 * setup the prefix mappings and schema info
+	 */
+	ret = ldb_search(module->ldb, schema_dn,
+			 LDB_SCOPE_BASE,
+			 NULL, schema_attrs,
+			 &schema_res);
+	if (ret != LDB_SUCCESS) {
+		ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+			      "schema_fsmo_init: failed to search the schema head: %d:%s",
+			      ret, ldb_strerror(ret));
+		talloc_free(mem_ctx);
+		return ret;
+	}
+	talloc_steal(mem_ctx, schema_res);
+	if (schema_res->count == 0) {
+		ldb_debug(module->ldb, LDB_DEBUG_TRACE,
+			  "schema_fsmo_init: no schema head present: (skip schema loading)");
+		talloc_free(mem_ctx);
+		return ldb_next_init(module);
+	} else if (schema_res->count > 1) {
+		ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+			      "schema_fsmo_init: [%u] schema heads found on a base search",
+			      schema_res->count);
+		talloc_free(mem_ctx);
+		return LDB_ERR_CONSTRAINT_VIOLATION;
+	}
+
+	prefix_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "prefixMap");
+	if (!prefix_val) {
+		ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+			      "schema_fsmo_init: no prefixMap attribute found");
+		talloc_free(mem_ctx);
+		return LDB_ERR_CONSTRAINT_VIOLATION;
+	}
+	info_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "schemaInfo");
+	if (!info_val) {
+		ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+			      "schema_fsmo_init: no schemaInfo attribute found");
+		talloc_free(mem_ctx);
+		return LDB_ERR_CONSTRAINT_VIOLATION;
+	}
+
+	status = dsdb_load_oid_mappings_ldb(schema, prefix_val, info_val);
+	if (!W_ERROR_IS_OK(status)) {
+		ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+			      "schema_fsmo_init: failed to load oid mappings: %s",
+			      win_errstr(status));
+		talloc_free(mem_ctx);
+		return LDB_ERR_CONSTRAINT_VIOLATION;
+	}
+
+	/*
+	 * load the attribute definitions
+	 */
+	ret = ldb_search(module->ldb, schema_dn,
+			 LDB_SCOPE_ONELEVEL,
+			 "(objectClass=attributeSchema)", NULL,
+			 &a_res);
+	if (ret != LDB_SUCCESS) {
+		ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+			      "schema_fsmo_init: failed to search attributeSchema objects: %d:%s",
+			      ret, ldb_strerror(ret));
+		talloc_free(mem_ctx);
+		return ret;
+	}
+	talloc_steal(mem_ctx, a_res);
+
+	for (i=0; i < a_res->count; i++) {
+		struct dsdb_attribute *sa;
+
+		sa = talloc_zero(schema, struct dsdb_attribute);
+		if (!sa) {
+			ldb_oom(module->ldb);
+			return LDB_ERR_OPERATIONS_ERROR;
+		}
+
+		status = dsdb_attribute_from_ldb(schema, a_res->msgs[i], sa, sa);
+		if (!W_ERROR_IS_OK(status)) {
+			ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+				      "schema_fsmo_init: failed to load attriute definition: %s:%s",
+				      ldb_dn_get_linearized(a_res->msgs[i]->dn),
+				      win_errstr(status));
+			talloc_free(mem_ctx);
+			return LDB_ERR_CONSTRAINT_VIOLATION;
+		}
+
+		DLIST_ADD_END(schema->attributes, sa, struct dsdb_attribute *);
+	}
+	talloc_free(a_res);
+
+	/*
+	 * load the objectClass definitions
+	 */
+	ret = ldb_search(module->ldb, schema_dn,
+			 LDB_SCOPE_ONELEVEL,
+			 "(objectClass=classSchema)", NULL,
+			 &c_res);
+	if (ret != LDB_SUCCESS) {
+		ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+			      "schema_fsmo_init: failed to search classSchema objects: %d:%s",
+			      ret, ldb_strerror(ret));
+		talloc_free(mem_ctx);
+		return ret;
+	}
+	talloc_steal(mem_ctx, c_res);
+
+	for (i=0; i < c_res->count; i++) {
+		struct dsdb_class *sc;
+
+		sc = talloc_zero(schema, struct dsdb_class);
+		if (!sc) {
+			ldb_oom(module->ldb);
+			return LDB_ERR_OPERATIONS_ERROR;
+		}
+
+		status = dsdb_class_from_ldb(schema, c_res->msgs[i], sc, sc);
+		if (!W_ERROR_IS_OK(status)) {
+			ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+				      "schema_fsmo_init: failed to load class definition: %s:%s",
+				      ldb_dn_get_linearized(c_res->msgs[i]->dn),
+				      win_errstr(status));
+			talloc_free(mem_ctx);
+			return LDB_ERR_CONSTRAINT_VIOLATION;
+		}
+
+		DLIST_ADD_END(schema->classes, sc, struct dsdb_class *);
+	}
+	talloc_free(c_res);
+
+	ret = dsdb_set_schema(module->ldb, schema);
+	if (ret != LDB_SUCCESS) {
+		ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
+			      "schema_fsmo_init: dsdb_set_schema() failed: %d:%s",
+			      ret, ldb_strerror(ret));
+		talloc_free(mem_ctx);
+		return ret;
+	}
+
+	talloc_steal(module, schema);
+	talloc_free(mem_ctx);
+	return ldb_next_init(module);
+}
+
+static const struct ldb_module_ops schema_fsmo_ops = {
+	.name		= "schema_fsmo",
+	.init_context	= schema_fsmo_init
+};
+
+int schema_fsmo_module_init(void)
+{
+	return ldb_register_module(&schema_fsmo_ops);
+}