source4/dsdb/repl/replicated_objects.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3    Helper functions for applying replicated objects
   4
   5    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 */
  22
  23 #include "includes.h"
  24 #include "dsdb/samdb/samdb.h"
  25 #include "lib/ldb/include/ldb_errors.h"
  26 #include "lib/util/dlinklist.h"
  27 #include "librpc/gen_ndr/ndr_misc.h"
  28 #include "librpc/gen_ndr/ndr_drsuapi.h"
  29 #include "librpc/gen_ndr/ndr_drsblobs.h"
  30 #include "lib/crypto/crypto.h"
  31 #include "libcli/auth/libcli_auth.h"
  32
  33 static WERROR dsdb_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
  34                                            const DATA_BLOB *gensec_skey,
  35                                            bool rid_crypt,
  36                                            uint32_t rid,
  37                                            DATA_BLOB *in,
  38                                            DATA_BLOB *out)
  39 {
  40         DATA_BLOB confounder;
  41         DATA_BLOB enc_buffer;
  42
  43         struct MD5Context md5;
  44         uint8_t _enc_key[16];
  45         DATA_BLOB enc_key;
  46
  47         DATA_BLOB dec_buffer;
  48
  49         uint32_t crc32_given;
  50         uint32_t crc32_calc;
  51         DATA_BLOB checked_buffer;
  52
  53         DATA_BLOB plain_buffer;
  54
  55         /*
  56          * users with rid == 0 should not exist
  57          */
  58         if (rid_crypt && rid == 0) {
  59                 return WERR_DS_DRA_INVALID_PARAMETER;
  60         }
  61
  62         /*
  63          * the first 16 bytes at the beginning are the confounder
  64          * followed by the 4 byte crc32 checksum
  65          */
  66         if (in->length < 20) {
  67                 return WERR_DS_DRA_INVALID_PARAMETER;
  68         }
  69         confounder = data_blob_const(in->data, 16);
  70         enc_buffer = data_blob_const(in->data + 16, in->length - 16);
  71
  72         /*
  73          * build the encryption key md5 over the session key followed
  74          * by the confounder
  75          *
  76          * here the gensec session key is used and
  77          * not the dcerpc ncacn_ip_tcp "SystemLibraryDTC" key!
  78          */
  79         enc_key = data_blob_const(_enc_key, sizeof(_enc_key));
  80         MD5Init(&md5);
  81         MD5Update(&md5, gensec_skey->data, gensec_skey->length);
  82         MD5Update(&md5, confounder.data, confounder.length);
  83         MD5Final(enc_key.data, &md5);
  84
  85         /*
  86          * copy the encrypted buffer part and
  87          * decrypt it using the created encryption key using arcfour
  88          */
  89         dec_buffer = data_blob_const(enc_buffer.data, enc_buffer.length);
  90         arcfour_crypt_blob(dec_buffer.data, dec_buffer.length, &enc_key);
  91
  92         /*
  93          * the first 4 byte are the crc32 checksum
  94          * of the remaining bytes
  95          */
  96         crc32_given = IVAL(dec_buffer.data, 0);
  97         crc32_calc = crc32_calc_buffer(dec_buffer.data + 4 , dec_buffer.length - 4);
  98         if (crc32_given != crc32_calc) {
  99                 return WERR_SEC_E_DECRYPT_FAILURE;
 100         }
 101         checked_buffer = data_blob_const(dec_buffer.data + 4, dec_buffer.length - 4);
 102
 103         plain_buffer = data_blob_talloc(mem_ctx, checked_buffer.data, checked_buffer.length);
 104         W_ERROR_HAVE_NO_MEMORY(plain_buffer.data);
 105
 106         if (rid_crypt) {
 107                 uint32_t i, num_hashes;
 108
 109                 if ((checked_buffer.length % 16) != 0) {
 110                         return WERR_DS_DRA_INVALID_PARAMETER;
 111                 }
 112
 113                 num_hashes = plain_buffer.length / 16;
 114                 for (i = 0; i < num_hashes; i++) {
 115                         uint32_t offset = i * 16;
 116                         sam_rid_crypt(rid, checked_buffer.data + offset, plain_buffer.data + offset, 0);
 117                 }
 118         }
 119
 120         *out = plain_buffer;
 121         return WERR_OK;
 122 }
 123
 124 static WERROR dsdb_decrypt_attribute(const DATA_BLOB *gensec_skey,
 125                                      uint32_t rid,
 126                                      struct drsuapi_DsReplicaAttribute *attr)
 127 {
 128         WERROR status;
 129         TALLOC_CTX *mem_ctx;
 130         DATA_BLOB *enc_data;
 131         DATA_BLOB plain_data;
 132         bool rid_crypt = false;
 133
 134         if (attr->value_ctr.num_values == 0) {
 135                 return WERR_OK;
 136         }
 137
 138         switch (attr->attid) {
 139         case DRSUAPI_ATTRIBUTE_dBCSPwd:
 140         case DRSUAPI_ATTRIBUTE_unicodePwd:
 141         case DRSUAPI_ATTRIBUTE_ntPwdHistory:
 142         case DRSUAPI_ATTRIBUTE_lmPwdHistory:
 143                 rid_crypt = true;
 144                 break;
 145         case DRSUAPI_ATTRIBUTE_supplementalCredentials:
 146         case DRSUAPI_ATTRIBUTE_priorValue:
 147         case DRSUAPI_ATTRIBUTE_currentValue:
 148         case DRSUAPI_ATTRIBUTE_trustAuthOutgoing:
 149         case DRSUAPI_ATTRIBUTE_trustAuthIncoming:
 150         case DRSUAPI_ATTRIBUTE_initialAuthOutgoing:
 151         case DRSUAPI_ATTRIBUTE_initialAuthIncoming:
 152                 break;
 153         default:
 154                 return WERR_OK;
 155         }
 156
 157         if (attr->value_ctr.num_values > 1) {
 158                 return WERR_DS_DRA_INVALID_PARAMETER;
 159         }
 160
 161         if (!attr->value_ctr.values[0].blob) {
 162                 return WERR_DS_DRA_INVALID_PARAMETER;
 163         }
 164
 165         mem_ctx         = attr->value_ctr.values[0].blob;
 166         enc_data        = attr->value_ctr.values[0].blob;
 167
 168         status = dsdb_decrypt_attribute_value(mem_ctx,
 169                                               gensec_skey,
 170                                               rid_crypt,
 171                                               rid,
 172                                               enc_data,
 173                                               &plain_data);
 174         W_ERROR_NOT_OK_RETURN(status);
 175
 176         talloc_free(attr->value_ctr.values[0].blob->data);
 177         *attr->value_ctr.values[0].blob = plain_data;
 178
 179         return WERR_OK;
 180 }
 181
 182 static WERROR dsdb_convert_object(struct ldb_context *ldb,
 183                                   const struct dsdb_schema *schema,
 184                                   struct dsdb_extended_replicated_objects *ctr,
 185                                   const struct drsuapi_DsReplicaObjectListItemEx *in,
 186                                   const DATA_BLOB *gensec_skey,
 187                                   TALLOC_CTX *mem_ctx,
 188                                   struct dsdb_extended_replicated_object *out)
 189 {
 190         NTSTATUS nt_status;
 191         WERROR status;
 192         uint32_t i;
 193         struct ldb_message *msg;
 194         struct replPropertyMetaDataBlob *md;
 195         struct ldb_val guid_value;
 196         NTTIME whenChanged = 0;
 197         time_t whenChanged_t;
 198         const char *whenChanged_s;
 199         const char *rdn_name = NULL;
 200         const struct ldb_val *rdn_value = NULL;
 201         const struct dsdb_attribute *rdn_attr = NULL;
 202         uint32_t rdn_attid;
 203         struct drsuapi_DsReplicaAttribute *name_a = NULL;
 204         struct drsuapi_DsReplicaMetaData *name_d = NULL;
 205         struct replPropertyMetaData1 *rdn_m = NULL;
 206         struct dom_sid *sid = NULL;
 207         uint32_t rid = 0;
 208         int ret;
 209
 210         if (!in->object.identifier) {
 211                 return WERR_FOOBAR;
 212         }
 213
 214         if (!in->object.identifier->dn || !in->object.identifier->dn[0]) {
 215                 return WERR_FOOBAR;
 216         }
 217
 218         if (in->object.attribute_ctr.num_attributes != 0 && !in->meta_data_ctr) {
 219                 return WERR_FOOBAR;
 220         }
 221
 222         if (in->object.attribute_ctr.num_attributes != in->meta_data_ctr->count) {
 223                 return WERR_FOOBAR;
 224         }
 225
 226         sid = &in->object.identifier->sid;
 227         if (sid->num_auths > 0) {
 228                 rid = sid->sub_auths[sid->num_auths - 1];
 229         }
 230
 231         msg = ldb_msg_new(mem_ctx);
 232         W_ERROR_HAVE_NO_MEMORY(msg);
 233
 234         msg->dn                 = ldb_dn_new(msg, ldb, in->object.identifier->dn);
 235         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 236
 237         rdn_name        = ldb_dn_get_rdn_name(msg->dn);
 238         rdn_attr        = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 239         if (!rdn_attr) {
 240                 return WERR_FOOBAR;
 241         }
 242         rdn_attid       = rdn_attr->attributeID_id;
 243         rdn_value       = ldb_dn_get_rdn_val(msg->dn);
 244
 245         msg->num_elements       = in->object.attribute_ctr.num_attributes;
 246         msg->elements           = talloc_array(msg, struct ldb_message_element,
 247                                                msg->num_elements);
 248         W_ERROR_HAVE_NO_MEMORY(msg->elements);
 249
 250         md = talloc(mem_ctx, struct replPropertyMetaDataBlob);
 251         W_ERROR_HAVE_NO_MEMORY(md);
 252
 253         md->version             = 1;
 254         md->reserved            = 0;
 255         md->ctr.ctr1.count      = in->meta_data_ctr->count;
 256         md->ctr.ctr1.reserved   = 0;
 257         md->ctr.ctr1.array      = talloc_array(mem_ctx,
 258                                                struct replPropertyMetaData1,
 259                                                md->ctr.ctr1.count + 1); /* +1 because of the RDN attribute */
 260         W_ERROR_HAVE_NO_MEMORY(md->ctr.ctr1.array);
 261
 262         for (i=0; i < in->meta_data_ctr->count; i++) {
 263                 struct drsuapi_DsReplicaAttribute *a;
 264                 struct drsuapi_DsReplicaMetaData *d;
 265                 struct replPropertyMetaData1 *m;
 266                 struct ldb_message_element *e;
 267
 268                 a = &in->object.attribute_ctr.attributes[i];
 269                 d = &in->meta_data_ctr->meta_data[i];
 270                 m = &md->ctr.ctr1.array[i];
 271                 e = &msg->elements[i];
 272
 273                 status = dsdb_decrypt_attribute(gensec_skey, rid, a);
 274                 W_ERROR_NOT_OK_RETURN(status);
 275
 276                 status = dsdb_attribute_drsuapi_to_ldb(schema, a, msg->elements, e);
 277                 W_ERROR_NOT_OK_RETURN(status);
 278
 279                 m->attid                        = a->attid;
 280                 m->version                      = d->version;
 281                 m->originating_change_time      = d->originating_change_time;
 282                 m->originating_invocation_id    = d->originating_invocation_id;
 283                 m->originating_usn              = d->originating_usn;
 284                 m->local_usn                    = 0;
 285
 286                 if (d->originating_change_time > whenChanged) {
 287                         whenChanged = d->originating_change_time;
 288                 }
 289
 290                 if (a->attid == DRSUAPI_ATTRIBUTE_name) {
 291                         name_a = a;
 292                         name_d = d;
 293                         rdn_m = &md->ctr.ctr1.array[md->ctr.ctr1.count];
 294                 }
 295         }
 296
 297         if (rdn_m) {
 298                 ret = ldb_msg_add_value(msg, rdn_attr->lDAPDisplayName, rdn_value, NULL);
 299                 if (ret != LDB_SUCCESS) {
 300                         return WERR_FOOBAR;
 301                 }
 302
 303                 rdn_m->attid                            = rdn_attid;
 304                 rdn_m->version                          = name_d->version;
 305                 rdn_m->originating_change_time          = name_d->originating_change_time;
 306                 rdn_m->originating_invocation_id        = name_d->originating_invocation_id;
 307                 rdn_m->originating_usn                  = name_d->originating_usn;
 308                 rdn_m->local_usn                        = 0;
 309                 md->ctr.ctr1.count++;
 310
 311         }
 312
 313         whenChanged_t = nt_time_to_unix(whenChanged);
 314         whenChanged_s = ldb_timestring(msg, whenChanged_t);
 315         W_ERROR_HAVE_NO_MEMORY(whenChanged_s);
 316
 317         nt_status = ndr_push_struct_blob(&guid_value, msg, &in->object.identifier->guid,
 318                                          (ndr_push_flags_fn_t)ndr_push_GUID);
 319         if (!NT_STATUS_IS_OK(nt_status)) {
 320                 return ntstatus_to_werror(nt_status);
 321         }
 322
 323         out->msg                = msg;
 324         out->guid_value         = guid_value;
 325         out->when_changed       = whenChanged_s;
 326         out->meta_data          = md;
 327         return WERR_OK;
 328 }
 329
 330 WERROR dsdb_extended_replicated_objects_commit(struct ldb_context *ldb,
 331                                                const char *partition_dn,
 332                                                const struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr,
 333                                                uint32_t object_count,
 334                                                const struct drsuapi_DsReplicaObjectListItemEx *first_object,
 335                                                uint32_t linked_attributes_count,
 336                                                const struct drsuapi_DsReplicaLinkedAttribute *linked_attributes,
 337                                                const struct repsFromTo1 *source_dsa,
 338                                                const struct drsuapi_DsReplicaCursor2CtrEx *uptodateness_vector,
 339                                                const DATA_BLOB *gensec_skey,
 340                                                TALLOC_CTX *mem_ctx,
 341                                                struct dsdb_extended_replicated_objects **_out)
 342 {
 343         WERROR status;
 344         const struct dsdb_schema *schema;
 345         struct dsdb_extended_replicated_objects *out;
 346         struct ldb_result *ext_res;
 347         const struct drsuapi_DsReplicaObjectListItemEx *cur;
 348         uint32_t i;
 349         int ret;
 350
 351         schema = dsdb_get_schema(ldb);
 352         if (!schema) {
 353                 return WERR_DS_SCHEMA_NOT_LOADED;
 354         }
 355
 356         status = dsdb_verify_oid_mappings_drsuapi(schema, mapping_ctr);
 357         W_ERROR_NOT_OK_RETURN(status);
 358
 359         out = talloc_zero(mem_ctx, struct dsdb_extended_replicated_objects);
 360         W_ERROR_HAVE_NO_MEMORY(out);
 361         out->version            = DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION;
 362
 363         out->partition_dn       = ldb_dn_new(out, ldb, partition_dn);
 364         W_ERROR_HAVE_NO_MEMORY(out->partition_dn);
 365
 366         out->source_dsa         = source_dsa;
 367         out->uptodateness_vector= uptodateness_vector;
 368
 369         out->num_objects        = object_count;
 370         out->objects            = talloc_array(out,
 371                                                struct dsdb_extended_replicated_object,
 372                                                out->num_objects);
 373         W_ERROR_HAVE_NO_MEMORY(out->objects);
 374
 375         for (i=0, cur = first_object; cur; cur = cur->next_object, i++) {
 376                 if (i == out->num_objects) {
 377                         return WERR_FOOBAR;
 378                 }
 379
 380                 status = dsdb_convert_object(ldb, schema, out, cur, gensec_skey, out->objects, &out->objects[i]);
 381                 W_ERROR_NOT_OK_RETURN(status);
 382         }
 383         if (i != out->num_objects) {
 384                 return WERR_FOOBAR;
 385         }
 386
 387         /* TODO: handle linked attributes */
 388
 389         ret = ldb_extended(ldb, DSDB_EXTENDED_REPLICATED_OBJECTS_OID, out, &ext_res);
 390         if (ret != LDB_SUCCESS) {
 391                 DEBUG(0,("Failed to apply records: %d: %s\n",
 392                         ret, ldb_strerror(ret)));
 393                 talloc_free(out);
 394                 return WERR_FOOBAR;
 395         }
 396         talloc_free(ext_res);
 397
 398         if (_out) {
 399                 *_out = out;
 400         } else {
 401                 talloc_free(out);
 402         }
 403
 404         return WERR_OK;
 405 }