source4/dsdb/schema/schema_info_attr.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    SCHEMA::schemaInfo implementation
   5
   6    Copyright (C) Kamen Mazdrashki <kamenim@samba.org> 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "dsdb/common/util.h"
  24 #include "dsdb/samdb/samdb.h"
  25 #include "dsdb/samdb/ldb_modules/util.h"
  26 #include <ldb_module.h>
  27 #include "librpc/gen_ndr/ndr_drsuapi.h"
  28 #include "librpc/gen_ndr/ndr_drsblobs.h"
  29 #include "param/param.h"
  30
  31
  32 /**
  33  * Creates and initializes new dsdb_schema_info value.
  34  * Initial schemaInfo values is with:
  35  *   revision = 0
  36  *   invocationId = GUID_ZERO
  37  */
  38 WERROR dsdb_schema_info_new(TALLOC_CTX *mem_ctx, struct dsdb_schema_info **_schema_info)
  39 {
  40         struct dsdb_schema_info *schema_info;
  41
  42         schema_info = talloc_zero(mem_ctx, struct dsdb_schema_info);
  43         W_ERROR_HAVE_NO_MEMORY(schema_info);
  44
  45         *_schema_info = schema_info;
  46
  47         return WERR_OK;
  48 }
  49
  50 /**
  51  * Creates and initializes new dsdb_schema_info blob value.
  52  * Initial schemaInfo values is with:
  53  *   revision = 0
  54  *   invocationId = GUID_ZERO
  55  */
  56 WERROR dsdb_schema_info_blob_new(TALLOC_CTX *mem_ctx, DATA_BLOB *_schema_info_blob)
  57 {
  58         DATA_BLOB blob;
  59
  60         blob = data_blob_talloc_zero(mem_ctx, 21);
  61         W_ERROR_HAVE_NO_MEMORY(blob.data);
  62
  63         /* Set the schemaInfo marker to 0xFF */
  64         blob.data[0] = 0xFF;
  65
  66         *_schema_info_blob = blob;
  67
  68         return WERR_OK;
  69 }
  70
  71
  72 /**
  73  * Verify the 'blob' is a valid schemaInfo blob
  74  */
  75 bool dsdb_schema_info_blob_is_valid(const DATA_BLOB *blob)
  76 {
  77         if (!blob || !blob->data) {
  78                 return false;
  79         }
  80
  81         /* schemaInfo blob must be 21 bytes long */
  82         if (blob->length != 21) {
  83                 return false;
  84         }
  85
  86         /* schemaInfo blob should start with 0xFF */
  87         if (blob->data[0] != 0xFF) {
  88                 return false;
  89         }
  90
  91         return true;
  92 }
  93
  94 /**
  95  * Parse schemaInfo structure from a data_blob
  96  * (DATA_BLOB or ldb_val).
  97  * Suitable for parsing blobs that comes from
  98  * DRS interface of from LDB database
  99  */
 100 WERROR dsdb_schema_info_from_blob(const DATA_BLOB *blob,
 101                                   TALLOC_CTX *mem_ctx, struct dsdb_schema_info **_schema_info)
 102 {
 103         TALLOC_CTX *temp_ctx;
 104         enum ndr_err_code ndr_err;
 105         struct dsdb_schema_info *schema_info;
 106         struct schemaInfoBlob schema_info_blob;
 107
 108         /* verify schemaInfo blob is valid */
 109         if (!dsdb_schema_info_blob_is_valid(blob)) {
 110                 return WERR_INVALID_PARAMETER;
 111         }
 112
 113         temp_ctx = talloc_new(mem_ctx);
 114         W_ERROR_HAVE_NO_MEMORY(temp_ctx);
 115
 116         ndr_err = ndr_pull_struct_blob_all(blob, temp_ctx,
 117                                            &schema_info_blob,
 118                                            (ndr_pull_flags_fn_t)ndr_pull_schemaInfoBlob);
 119         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 120                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
 121                 talloc_free(temp_ctx);
 122                 return ntstatus_to_werror(nt_status);
 123         }
 124
 125         schema_info = talloc(mem_ctx, struct dsdb_schema_info);
 126         if (!schema_info) {
 127                 talloc_free(temp_ctx);
 128                 return WERR_NOMEM;
 129         }
 130
 131         /* note that we accept revision numbers of zero now - w2k8r2
 132            sends a revision of zero on initial vampire */
 133         schema_info->revision      = schema_info_blob.revision;
 134         schema_info->invocation_id = schema_info_blob.invocation_id;
 135         *_schema_info = schema_info;
 136
 137         talloc_free(temp_ctx);
 138         return WERR_OK;
 139 }
 140
 141 /**
 142  * Creates a blob from schemaInfo structure
 143  * Suitable for packing schemaInfo into a blob
 144  * which is to be used in DRS interface of LDB database
 145  */
 146 WERROR dsdb_blob_from_schema_info(const struct dsdb_schema_info *schema_info,
 147                                   TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
 148 {
 149         enum ndr_err_code ndr_err;
 150         struct schemaInfoBlob schema_info_blob;
 151
 152         schema_info_blob.marker         = 0xFF;
 153         schema_info_blob.revision       = schema_info->revision;
 154         schema_info_blob.invocation_id  = schema_info->invocation_id;
 155
 156         ndr_err = ndr_push_struct_blob(blob, mem_ctx,
 157                                        &schema_info_blob,
 158                                        (ndr_push_flags_fn_t)ndr_push_schemaInfoBlob);
 159         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 160                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
 161                 return ntstatus_to_werror(nt_status);
 162         }
 163
 164         return WERR_OK;
 165 }
 166
 167 /**
 168  * Compares schemaInfo signatures in dsdb_schema and prefixMap.
 169  * NOTE: At present function compares schemaInfo values
 170  * as string without taking into account schemVersion field
 171  *
 172  * @return WERR_OK if schemaInfos are equal
 173  *         WERR_DS_DRA_SCHEMA_MISMATCH if schemaInfos are different
 174  */
 175 WERROR dsdb_schema_info_cmp(const struct dsdb_schema *schema,
 176                             const struct drsuapi_DsReplicaOIDMapping_Ctr *ctr)
 177 {
 178         bool bres;
 179         DATA_BLOB blob;
 180         char *schema_info_str;
 181         struct drsuapi_DsReplicaOIDMapping *mapping;
 182
 183         /* we should have at least schemaInfo element */
 184         if (ctr->num_mappings < 1) {
 185                 return WERR_INVALID_PARAMETER;
 186         }
 187
 188         /* verify schemaInfo element is valid */
 189         mapping = &ctr->mappings[ctr->num_mappings - 1];
 190         if (mapping->id_prefix != 0) {
 191                 return WERR_INVALID_PARAMETER;
 192         }
 193
 194         blob = data_blob_const(mapping->oid.binary_oid, mapping->oid.length);
 195         if (!dsdb_schema_info_blob_is_valid(&blob)) {
 196                 return WERR_INVALID_PARAMETER;
 197         }
 198
 199         schema_info_str = hex_encode_talloc(NULL, blob.data, blob.length);
 200         W_ERROR_HAVE_NO_MEMORY(schema_info_str);
 201
 202         bres = strequal(schema->schema_info, schema_info_str);
 203         talloc_free(schema_info_str);
 204
 205         return bres ? WERR_OK : WERR_DS_DRA_SCHEMA_MISMATCH;
 206 }
 207
 208