s4/dsdb: dsdb_schema_info object implementation

1 files changed, 383 insertions, 0 deletions

diff --git a/source4/dsdb/schema/schema_info_attr.c b/source4/dsdb/schema/schema_info_attr.c
new file mode 100644
index 0000000000..2d3dfc827c
--- /dev/null
+++ b/source4/dsdb/schema/schema_info_attr.c
@@ -0,0 +1,383 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   SCHEMA::schemaInfo implementation
+
+   Copyright (C) Kamen Mazdrashki <kamenim@samba.org> 2010
+
+   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/>.
+*/
+
+#include "includes.h"
+#include "dsdb/common/util.h"
+#include "dsdb/samdb/samdb.h"
+#include "dsdb/samdb/ldb_modules/util.h"
+#include "lib/ldb/include/ldb_module.h"
+#include "librpc/gen_ndr/ndr_drsuapi.h"
+#include "librpc/gen_ndr/ndr_drsblobs.h"
+#include "param/param.h"
+
+
+/**
+ * Parse schemaInfo structure from a data_blob
+ * (DATA_BLOB or ldb_val).
+ * Suitable for parsing blobs that comes from
+ * DRS interface of from LDB database
+ */
+WERROR dsdb_schema_info_from_blob(const DATA_BLOB *blob,
+				  TALLOC_CTX *mem_ctx, struct dsdb_schema_info **_schema_info)
+{
+	TALLOC_CTX *temp_ctx;
+	enum ndr_err_code ndr_err;
+	struct dsdb_schema_info *schema_info;
+	struct schemaInfoBlob schema_info_blob;
+
+	if (!blob || !blob->data) {
+		return WERR_INVALID_PARAMETER;
+	}
+
+	if (blob->length != 21) {
+		return WERR_INVALID_PARAMETER;
+	}
+
+	/* schemaInfo blob should start with 0xFF */
+	if (blob->data[0] != 0xFF) {
+		return WERR_INVALID_PARAMETER;
+	}
+
+	temp_ctx = talloc_new(mem_ctx);
+	W_ERROR_HAVE_NO_MEMORY(temp_ctx);
+
+	ndr_err = ndr_pull_struct_blob_all(blob, temp_ctx,
+	                                   lp_iconv_convenience(NULL), &schema_info_blob,
+	                                   (ndr_pull_flags_fn_t)ndr_pull_schemaInfoBlob);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
+		talloc_free(temp_ctx);
+		return ntstatus_to_werror(nt_status);
+	}
+
+	/* revision must be not less than 1 */
+	if (schema_info_blob.revision < 1) {
+		talloc_free(temp_ctx);
+		return WERR_INVALID_PARAMETER;
+	}
+
+	schema_info = talloc(mem_ctx, struct dsdb_schema_info);
+	if (!schema_info) {
+		talloc_free(temp_ctx);
+		return WERR_NOMEM;
+	}
+	schema_info->revision      = schema_info_blob.revision;
+	schema_info->invocation_id = schema_info_blob.invocation_id;
+	*_schema_info = schema_info;
+
+	talloc_free(temp_ctx);
+	return WERR_OK;
+}
+
+/**
+ * Creates a blob from schemaInfo structure
+ * Suitable for packing schemaInfo into a blob
+ * which is to be used in DRS interface of LDB database
+ */
+WERROR dsdb_blob_from_schema_info(const struct dsdb_schema_info *schema_info,
+				  TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
+{
+	enum ndr_err_code ndr_err;
+	struct schemaInfoBlob schema_info_blob;
+
+	if (schema_info->revision < 1) {
+		return WERR_INVALID_PARAMETER;
+	}
+
+	schema_info_blob.marker		= 0xFF;
+	schema_info_blob.revision	= schema_info->revision;
+	schema_info_blob.invocation_id  = schema_info->invocation_id;
+
+	ndr_err = ndr_push_struct_blob(blob, mem_ctx,
+	                               lp_iconv_convenience(NULL), &schema_info_blob,
+	                               (ndr_push_flags_fn_t)ndr_push_schemaInfoBlob);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
+		return ntstatus_to_werror(nt_status);
+	}
+
+	return WERR_OK;
+}
+
+
+/**
+ * Reads schema_info structure from schemaInfo
+ * attribute on SCHEMA partition
+ *
+ * @param dsdb_flags 	DSDB_FLAG_... flag of 0
+ */
+WERROR dsdb_module_schema_info_blob_read(struct ldb_module *ldb_module,
+					 uint32_t dsdb_flags,
+					 TALLOC_CTX *mem_ctx, DATA_BLOB *schema_info_blob)
+{
+	int ldb_err;
+	const struct ldb_val *blob_val;
+	struct ldb_dn *schema_dn;
+	struct ldb_result *schema_res = NULL;
+	static const char *schema_attrs[] = {
+		"schemaInfo",
+		NULL
+	};
+
+	schema_dn = samdb_schema_dn(ldb_module_get_ctx(ldb_module));
+	if (!schema_dn) {
+		DEBUG(0,("dsdb_module_schema_info_blob_read: no schema dn present!\n"));
+		return WERR_INTERNAL_DB_CORRUPTION;
+	}
+
+	ldb_err = dsdb_module_search(ldb_module, mem_ctx, &schema_res, schema_dn,
+	                             LDB_SCOPE_BASE, schema_attrs, dsdb_flags, NULL);
+	if (ldb_err == LDB_ERR_NO_SUCH_OBJECT) {
+		DEBUG(0,("dsdb_module_schema_info_blob_read: Schema DN not found!\n"));
+		talloc_free(schema_res);
+		return WERR_INTERNAL_DB_CORRUPTION;
+	} else if (ldb_err != LDB_SUCCESS) {
+		DEBUG(0,("dsdb_module_schema_info_blob_read: failed to find schemaInfo attribute\n"));
+		talloc_free(schema_res);
+		return WERR_INTERNAL_DB_CORRUPTION;
+	}
+
+	blob_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "schemaInfo");
+	if (!blob_val) {
+		DEBUG(0,("dsdb_module_schema_info_blob_read: no schemaInfo attribute found\n"));
+		talloc_free(schema_res);
+		return WERR_DS_NO_ATTRIBUTE_OR_VALUE;
+	}
+
+	/* transfer .data ownership to mem_ctx */
+	schema_info_blob->length = blob_val->length;
+	schema_info_blob->data = talloc_steal(mem_ctx, blob_val->data);
+
+	talloc_free(schema_res);
+
+	return WERR_OK;
+}
+
+/**
+ * Writes schema_info structure into schemaInfo
+ * attribute on SCHEMA partition
+ *
+ * @param dsdb_flags 	DSDB_FLAG_... flag of 0
+ */
+WERROR dsdb_module_schema_info_blob_write(struct ldb_module *ldb_module,
+					  uint32_t dsdb_flags,
+					  DATA_BLOB *schema_info_blob)
+{
+	int ldb_err;
+	struct ldb_message *msg;
+	struct ldb_dn *schema_dn;
+	struct ldb_message_element *return_el;
+	TALLOC_CTX *temp_ctx;
+
+	schema_dn = samdb_schema_dn(ldb_module_get_ctx(ldb_module));
+	if (!schema_dn) {
+		DEBUG(0,("dsdb_module_schema_info_blob_write: no schema dn present\n"));
+		return WERR_INTERNAL_DB_CORRUPTION;
+	}
+
+	temp_ctx = talloc_new(ldb_module);
+	W_ERROR_HAVE_NO_MEMORY(temp_ctx);
+
+	/* write serialized schemaInfo into LDB */
+	msg = ldb_msg_new(temp_ctx);
+	if (!msg) {
+		talloc_free(temp_ctx);
+		return WERR_NOMEM;
+	}
+
+	msg->dn = schema_dn;
+	ldb_err = ldb_msg_add_value(msg, "schemaInfo", schema_info_blob, &return_el);
+	if (ldb_err != 0) {
+		talloc_free(temp_ctx);
+		DEBUG(0,("dsdb_module_schema_info_blob_write: ldb_msg_add_value failed\n"));
+		return WERR_NOMEM;
+	}
+
+	/* mark schemaInfo element for replacement */
+	return_el->flags = LDB_FLAG_MOD_REPLACE;
+
+	ldb_err = dsdb_module_modify(ldb_module, msg, dsdb_flags | DSDB_MODIFY_PERMISSIVE);
+
+	talloc_free(temp_ctx);
+
+	if (ldb_err != 0) {
+		DEBUG(0,("dsdb_module_schema_info_blob_write: dsdb_replace failed: %s (%s)\n",
+			 ldb_strerror(ldb_err),
+			 ldb_errstring(ldb_module_get_ctx(ldb_module))));
+		return WERR_INTERNAL_DB_ERROR;
+	}
+
+	return WERR_OK;
+}
+
+
+/**
+ * Reads schema_info structure from schemaInfo
+ * attribute on SCHEMA partition
+ */
+static WERROR dsdb_module_schema_info_read(struct ldb_module *ldb_module,
+					   uint32_t dsdb_flags,
+					   TALLOC_CTX *mem_ctx,
+					   struct dsdb_schema_info **_schema_info)
+{
+	WERROR werr;
+	DATA_BLOB ndr_blob;
+	TALLOC_CTX *temp_ctx;
+
+	temp_ctx = talloc_new(mem_ctx);
+	W_ERROR_HAVE_NO_MEMORY(temp_ctx);
+
+	/* read serialized schemaInfo from LDB  */
+	werr = dsdb_module_schema_info_blob_read(ldb_module, dsdb_flags, temp_ctx, &ndr_blob);
+	if (!W_ERROR_IS_OK(werr)) {
+		talloc_free(temp_ctx);
+		return werr;
+	}
+
+	/* convert NDR blob to dsdb_schema_info object */
+	werr = dsdb_schema_info_from_blob(&ndr_blob,
+					  mem_ctx,
+					  _schema_info);
+	talloc_free(temp_ctx);
+
+	return werr;
+}
+
+/**
+ * Writes schema_info structure into schemaInfo
+ * attribute on SCHEMA partition
+ *
+ * @param dsdb_flags 	DSDB_FLAG_... flag of 0
+ */
+static WERROR dsdb_module_schema_info_write(struct ldb_module *ldb_module,
+					    uint32_t dsdb_flags,
+					    const struct dsdb_schema_info *schema_info)
+{
+	WERROR werr;
+	DATA_BLOB ndr_blob;
+	TALLOC_CTX *temp_ctx;
+
+	temp_ctx = talloc_new(ldb_module);
+	W_ERROR_HAVE_NO_MEMORY(temp_ctx);
+
+	/* convert schema_info to a blob */
+	werr = dsdb_blob_from_schema_info(schema_info, temp_ctx, &ndr_blob);
+	if (!W_ERROR_IS_OK(werr)) {
+		talloc_free(temp_ctx);
+		return werr;
+	}
+
+	/* write serialized schemaInfo into LDB */
+	werr = dsdb_module_schema_info_blob_write(ldb_module, dsdb_flags, &ndr_blob);
+
+	talloc_free(temp_ctx);
+
+	return werr;
+}
+
+
+/**
+ * Creates new dsdb_schema_info object using
+ * invocationId from supplied ldb
+ */
+WERROR dsdb_schema_info_create(struct ldb_context *ldb, TALLOC_CTX *mem_ctx, struct dsdb_schema_info **_schema_info)
+{
+	const struct GUID *invocation_id;
+	struct dsdb_schema_info *schema_info;
+
+	/* try to determine invocationId from ldb */
+	invocation_id = samdb_ntds_invocation_id(ldb);
+
+	schema_info = talloc(mem_ctx, struct dsdb_schema_info);
+	if (!schema_info) {
+		return WERR_NOMEM;
+	}
+
+	schema_info->revision = 1;
+	if (invocation_id) {
+		schema_info->invocation_id = *invocation_id;
+	} else {
+		schema_info->invocation_id = GUID_zero();
+	}
+
+	*_schema_info = schema_info;
+
+	return WERR_OK;
+}
+
+
+/**
+ * Increments schemaInfo revision and save it to DB
+ * setting our invocationID in the process
+ * NOTE: this function should be called in a transaction
+ * much in the same way prefixMap update function is called
+ *
+ * @param ldb_module 	current module
+ * @param schema 	schema cache
+ * @param dsdb_flags 	DSDB_FLAG_... flag of 0
+ */
+WERROR dsdb_module_schema_info_update(struct ldb_module *ldb_module,
+				      struct dsdb_schema *schema,
+				      int dsdb_flags)
+{
+	WERROR werr;
+	const struct GUID *invocation_id;
+	struct dsdb_schema_info *schema_info;
+
+	TALLOC_CTX *mem_ctx = talloc_new(schema);
+	W_ERROR_HAVE_NO_MEMORY(mem_ctx);
+
+	invocation_id = samdb_ntds_invocation_id(ldb_module_get_ctx(ldb_module));
+	if (!invocation_id) {
+		return WERR_INTERNAL_DB_CORRUPTION;
+	}
+
+	werr = dsdb_module_schema_info_read(ldb_module, dsdb_flags,
+	                                    mem_ctx, &schema_info);
+	if (!W_ERROR_IS_OK(werr)) {
+		DEBUG(0,("dsdb_module_schema_info_update: failed to reload schemaInfo - %s\n",
+			 win_errstr(werr)));
+		talloc_free(mem_ctx);
+		return werr;
+	}
+
+	/* update schemaInfo */
+	schema_info->revision++;
+	schema_info->invocation_id = *invocation_id;
+
+	werr = dsdb_module_schema_info_write(ldb_module, dsdb_flags, schema_info);
+	if (!W_ERROR_IS_OK(werr)) {
+		DEBUG(0,("dsdb_module_schema_info_update: failed to save schemaInfo - %s\n",
+			 win_errstr(werr)));
+		talloc_free(mem_ctx);
+		return werr;
+	}
+
+	/* finally, update schema_info in the cache */
+	/* TODO: update schema_info in dsdb_schema cache */
+/*
+	talloc_unlink(schema, discard_const(schema->schema_info));
+	schema->schema_info = talloc_steal(schema, schema_info);
+*/
+
+	talloc_free(mem_ctx);
+	return WERR_OK;
+}