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/*
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 <ldb_module.h>
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "param/param.h"
/**
* Creates and initializes new dsdb_schema_info value.
* Initial schemaInfo values is with:
* revision = 0
* invocationId = GUID_ZERO
*/
WERROR dsdb_schema_info_new(TALLOC_CTX *mem_ctx, struct dsdb_schema_info **_schema_info)
{
struct dsdb_schema_info *schema_info;
schema_info = talloc_zero(mem_ctx, struct dsdb_schema_info);
W_ERROR_HAVE_NO_MEMORY(schema_info);
*_schema_info = schema_info;
return WERR_OK;
}
/**
* Creates and initializes new dsdb_schema_info blob value.
* Initial schemaInfo values is with:
* revision = 0
* invocationId = GUID_ZERO
*/
WERROR dsdb_schema_info_blob_new(TALLOC_CTX *mem_ctx, DATA_BLOB *_schema_info_blob)
{
DATA_BLOB blob;
blob = data_blob_talloc_zero(mem_ctx, 21);
W_ERROR_HAVE_NO_MEMORY(blob.data);
/* Set the schemaInfo marker to 0xFF */
blob.data[0] = 0xFF;
*_schema_info_blob = blob;
return WERR_OK;
}
/**
* Verify the 'blob' is a valid schemaInfo blob
*/
bool dsdb_schema_info_blob_is_valid(const DATA_BLOB *blob)
{
if (!blob || !blob->data) {
return false;
}
/* schemaInfo blob must be 21 bytes long */
if (blob->length != 21) {
return false;
}
/* schemaInfo blob should start with 0xFF */
if (blob->data[0] != 0xFF) {
return false;
}
return true;
}
/**
* Parse schemaInfo structure from a data_blob
* (DATA_BLOB or ldb_val).
* Suitable for parsing blobs that come from
* DRS interface or 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;
/* verify schemaInfo blob is valid */
if (!dsdb_schema_info_blob_is_valid(blob)) {
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,
&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);
}
schema_info = talloc(mem_ctx, struct dsdb_schema_info);
if (!schema_info) {
talloc_free(temp_ctx);
return WERR_NOT_ENOUGH_MEMORY;
}
/* note that we accept revision numbers of zero now - w2k8r2
sends a revision of zero on initial vampire */
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;
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,
&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;
}
/**
* Compares schemaInfo signatures in dsdb_schema and prefixMap.
* NOTE: At present function compares schemaInfo values
* as string without taking into account schemaVersion field
*
* @return WERR_OK if schemaInfos are equal
* WERR_DS_DRA_SCHEMA_MISMATCH if schemaInfos are different
*/
WERROR dsdb_schema_info_cmp(const struct dsdb_schema *schema,
const struct drsuapi_DsReplicaOIDMapping_Ctr *ctr)
{
TALLOC_CTX *frame = NULL;
DATA_BLOB blob = data_blob_null;
struct dsdb_schema_info *schema_info = NULL;
const struct drsuapi_DsReplicaOIDMapping *mapping = NULL;
WERROR werr;
/* we should have at least schemaInfo element */
if (ctr->num_mappings < 1) {
return WERR_INVALID_PARAMETER;
}
/* verify schemaInfo element is valid */
mapping = &ctr->mappings[ctr->num_mappings - 1];
if (mapping->id_prefix != 0) {
return WERR_INVALID_PARAMETER;
}
blob = data_blob_const(mapping->oid.binary_oid, mapping->oid.length);
if (!dsdb_schema_info_blob_is_valid(&blob)) {
return WERR_INVALID_PARAMETER;
}
frame = talloc_stackframe();
werr = dsdb_schema_info_from_blob(&blob, frame, &schema_info);
if (!W_ERROR_IS_OK(werr)) {
TALLOC_FREE(frame);
return werr;
}
/*
* shouldn't really be possible is dsdb_schema_info_from_blob
* succeeded, this check is just to satisfy static checker
*/
if (schema_info == NULL) {
TALLOC_FREE(frame);
return WERR_INVALID_PARAMETER;
}
if (schema->schema_info->revision > schema_info->revision) {
/*
* It's ok if our schema is newer than the remote one
*/
werr = WERR_OK;
} else if (schema->schema_info->revision < schema_info->revision) {
werr = WERR_DS_DRA_SCHEMA_MISMATCH;
} else if (!GUID_equal(&schema->schema_info->invocation_id,
&schema_info->invocation_id))
{
werr = WERR_DS_DRA_SCHEMA_CONFLICT;
} else {
werr = WERR_OK;
}
TALLOC_FREE(frame);
return werr;
}
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