source4/dsdb/repl/drepl_partitions.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3    DSDB replication service
   4
   5    Copyright (C) Stefan Metzmacher 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 3 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, see <http://www.gnu.org/licenses/>.
  19
  20 */
  21
  22 #include "includes.h"
  23 #include "dsdb/samdb/samdb.h"
  24 #include "auth/auth.h"
  25 #include "smbd/service.h"
  26 #include "lib/events/events.h"
  27 #include "dsdb/repl/drepl_service.h"
  28 #include <ldb_errors.h>
  29 #include "../lib/util/dlinklist.h"
  30 #include "librpc/gen_ndr/ndr_misc.h"
  31 #include "librpc/gen_ndr/ndr_drsuapi.h"
  32 #include "librpc/gen_ndr/ndr_drsblobs.h"
  33 #include "libcli/security/security.h"
  34 #include "param/param.h"
  35 #include "dsdb/common/util.h"
  36
  37 WERROR dreplsrv_load_partitions(struct dreplsrv_service *s)
  38 {
  39         WERROR status;
  40         static const char *attrs[] = { "hasMasterNCs", "hasPartialReplicaNCs", NULL };
  41         unsigned int i;
  42         int ret;
  43         TALLOC_CTX *tmp_ctx;
  44         struct ldb_result *res;
  45         struct ldb_message_element *el;
  46         struct ldb_dn *ntds_dn;
  47
  48         tmp_ctx = talloc_new(s);
  49         W_ERROR_HAVE_NO_MEMORY(tmp_ctx);
  50
  51         ntds_dn = samdb_ntds_settings_dn(s->samdb);
  52         if (!ntds_dn) {
  53                 DEBUG(1,(__location__ ": Unable to find ntds_dn: %s\n", ldb_errstring(s->samdb)));
  54                 talloc_free(tmp_ctx);
  55                 return WERR_DS_DRA_INTERNAL_ERROR;
  56         }
  57
  58         ret = dsdb_search_dn(s->samdb, tmp_ctx, &res, ntds_dn, attrs, DSDB_SEARCH_SHOW_EXTENDED_DN);
  59         if (ret != LDB_SUCCESS) {
  60                 DEBUG(1,("Searching for hasMasterNCs in NTDS DN failed: %s\n", ldb_errstring(s->samdb)));
  61                 talloc_free(tmp_ctx);
  62                 return WERR_DS_DRA_INTERNAL_ERROR;
  63         }
  64
  65         el = ldb_msg_find_element(res->msgs[0], "hasMasterNCs");
  66         if (!el) {
  67                 DEBUG(1,("Finding hasMasterNCs element in root_res failed: %s\n",
  68                          ldb_errstring(s->samdb)));
  69                 talloc_free(tmp_ctx);
  70                 return WERR_DS_DRA_INTERNAL_ERROR;
  71         }
  72
  73         for (i=0; i<el->num_values; i++) {
  74                 struct ldb_dn *pdn;
  75                 struct dreplsrv_partition *p;
  76
  77                 pdn = ldb_dn_from_ldb_val(tmp_ctx, s->samdb, &el->values[i]);
  78                 if (pdn == NULL) {
  79                         talloc_free(tmp_ctx);
  80                         return WERR_DS_DRA_INTERNAL_ERROR;
  81                 }
  82                 if (!ldb_dn_validate(pdn)) {
  83                         return WERR_DS_DRA_INTERNAL_ERROR;
  84                 }
  85
  86                 p = talloc_zero(s, struct dreplsrv_partition);
  87                 W_ERROR_HAVE_NO_MEMORY(p);
  88
  89                 p->dn = talloc_steal(p, pdn);
  90                 p->service = s;
  91
  92                 DLIST_ADD(s->partitions, p);
  93
  94                 DEBUG(2, ("dreplsrv_partition[%s] loaded\n", ldb_dn_get_linearized(p->dn)));
  95         }
  96
  97         el = ldb_msg_find_element(res->msgs[0], "hasPartialReplicaNCs");
  98
  99         for (i=0; el && i<el->num_values; i++) {
 100                 struct ldb_dn *pdn;
 101                 struct dreplsrv_partition *p;
 102
 103                 pdn = ldb_dn_from_ldb_val(tmp_ctx, s->samdb, &el->values[i]);
 104                 if (pdn == NULL) {
 105                         talloc_free(tmp_ctx);
 106                         return WERR_DS_DRA_INTERNAL_ERROR;
 107                 }
 108                 if (!ldb_dn_validate(pdn)) {
 109                         return WERR_DS_DRA_INTERNAL_ERROR;
 110                 }
 111
 112                 p = talloc_zero(s, struct dreplsrv_partition);
 113                 W_ERROR_HAVE_NO_MEMORY(p);
 114
 115                 p->dn = talloc_steal(p, pdn);
 116                 p->partial_replica = true;
 117                 p->service = s;
 118
 119                 DLIST_ADD(s->partitions, p);
 120
 121                 DEBUG(2, ("dreplsrv_partition[%s] loaded (partial replica)\n", ldb_dn_get_linearized(p->dn)));
 122         }
 123
 124         talloc_free(tmp_ctx);
 125
 126         status = dreplsrv_refresh_partitions(s);
 127         W_ERROR_NOT_OK_RETURN(status);
 128
 129         return WERR_OK;
 130 }
 131
 132 /*
 133   work out the principal to use for DRS replication connections
 134  */
 135 NTSTATUS dreplsrv_get_target_principal(struct dreplsrv_service *s,
 136                                        TALLOC_CTX *mem_ctx,
 137                                        const struct repsFromTo1 *rft,
 138                                        const char **target_principal)
 139 {
 140         TALLOC_CTX *tmp_ctx;
 141         struct ldb_result *res;
 142         const char *attrs[] = { "dNSHostName", NULL };
 143         int ret;
 144         const char *hostname;
 145         struct ldb_dn *dn;
 146         struct ldb_dn *forest_dn;
 147
 148         *target_principal = NULL;
 149
 150         tmp_ctx = talloc_new(mem_ctx);
 151
 152         /* we need to find their hostname */
 153         ret = dsdb_find_dn_by_guid(s->samdb, tmp_ctx, &rft->source_dsa_obj_guid, &dn);
 154         if (ret != LDB_SUCCESS) {
 155                 talloc_free(tmp_ctx);
 156                 /* its OK for their NTDSDSA DN not to be in our database */
 157                 return NT_STATUS_OK;
 158         }
 159
 160         /* strip off the NTDS Settings */
 161         if (!ldb_dn_remove_child_components(dn, 1)) {
 162                 talloc_free(tmp_ctx);
 163                 return NT_STATUS_OK;
 164         }
 165
 166         ret = dsdb_search_dn(s->samdb, tmp_ctx, &res, dn, attrs, 0);
 167         if (ret != LDB_SUCCESS) {
 168                 talloc_free(tmp_ctx);
 169                 /* its OK for their account DN not to be in our database */
 170                 return NT_STATUS_OK;
 171         }
 172
 173         hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
 174         if (hostname == NULL) {
 175                 talloc_free(tmp_ctx);
 176                 /* its OK to not have a dnshostname */
 177                 return NT_STATUS_OK;
 178         }
 179
 180         /* All DCs have the GC/hostname/realm name, but if some of the
 181          * preconditions are not satisfied, then we will fall back to
 182          * the
 183          * E3514235-4B06-11D1-AB04-00C04FC2DCD2/${NTDSGUID}/${DNSDOMAIN}
 184          * name.  This means that if a AD server has a dnsHostName set
 185          * on it's record, it must also have GC/hostname/realm
 186          * servicePrincipalName */
 187
 188         forest_dn = ldb_get_root_basedn(s->samdb);
 189         if (forest_dn == NULL) {
 190                 talloc_free(tmp_ctx);
 191                 return NT_STATUS_OK;
 192         }
 193
 194         *target_principal = talloc_asprintf(mem_ctx, "GC/%s/%s",
 195                                             hostname,
 196                                             samdb_dn_to_dns_domain(tmp_ctx, forest_dn));
 197         talloc_free(tmp_ctx);
 198         return NT_STATUS_OK;
 199 }
 200
 201
 202 WERROR dreplsrv_out_connection_attach(struct dreplsrv_service *s,
 203                                       const struct repsFromTo1 *rft,
 204                                       struct dreplsrv_out_connection **_conn)
 205 {
 206         struct dreplsrv_out_connection *cur, *conn = NULL;
 207         const char *hostname;
 208
 209         if (!rft->other_info) {
 210                 return WERR_FOOBAR;
 211         }
 212
 213         if (!rft->other_info->dns_name) {
 214                 return WERR_FOOBAR;
 215         }
 216
 217         hostname = rft->other_info->dns_name;
 218
 219         for (cur = s->connections; cur; cur = cur->next) {
 220                 if (strcmp(cur->binding->host, hostname) == 0) {
 221                         conn = cur;
 222                         break;
 223                 }
 224         }
 225
 226         if (!conn) {
 227                 NTSTATUS nt_status;
 228                 char *binding_str;
 229
 230                 conn = talloc_zero(s, struct dreplsrv_out_connection);
 231                 W_ERROR_HAVE_NO_MEMORY(conn);
 232
 233                 conn->service   = s;
 234
 235                 binding_str = talloc_asprintf(conn, "ncacn_ip_tcp:%s[krb5,seal]",
 236                                               hostname);
 237                 W_ERROR_HAVE_NO_MEMORY(binding_str);
 238                 nt_status = dcerpc_parse_binding(conn, binding_str, &conn->binding);
 239                 talloc_free(binding_str);
 240                 if (!NT_STATUS_IS_OK(nt_status)) {
 241                         return ntstatus_to_werror(nt_status);
 242                 }
 243
 244                 /* use the GC principal for DRS replication */
 245                 nt_status = dreplsrv_get_target_principal(s, conn->binding,
 246                                                           rft, &conn->binding->target_principal);
 247                 if (!NT_STATUS_IS_OK(nt_status)) {
 248                         return ntstatus_to_werror(nt_status);
 249                 }
 250
 251                 DLIST_ADD_END(s->connections, conn, struct dreplsrv_out_connection *);
 252
 253                 DEBUG(4,("dreplsrv_out_connection_attach(%s): create\n", conn->binding->host));
 254         } else {
 255                 DEBUG(4,("dreplsrv_out_connection_attach(%s): attach\n", conn->binding->host));
 256         }
 257
 258         *_conn = conn;
 259         return WERR_OK;
 260 }
 261
 262 /*
 263   find an existing source dsa in a list
 264  */
 265 static struct dreplsrv_partition_source_dsa *dreplsrv_find_source_dsa(struct dreplsrv_partition_source_dsa *list,
 266                                                                       struct GUID *guid)
 267 {
 268         struct dreplsrv_partition_source_dsa *s;
 269         for (s=list; s; s=s->next) {
 270                 if (GUID_compare(&s->repsFrom1->source_dsa_obj_guid, guid) == 0) {
 271                         return s;
 272                 }
 273         }
 274         return NULL;
 275 }
 276
 277
 278
 279 static WERROR dreplsrv_partition_add_source_dsa(struct dreplsrv_service *s,
 280                                                 struct dreplsrv_partition *p,
 281                                                 struct dreplsrv_partition_source_dsa **listp,
 282                                                 struct dreplsrv_partition_source_dsa *check_list,
 283                                                 const struct ldb_val *val)
 284 {
 285         WERROR status;
 286         enum ndr_err_code ndr_err;
 287         struct dreplsrv_partition_source_dsa *source, *s2;
 288
 289         source = talloc_zero(p, struct dreplsrv_partition_source_dsa);
 290         W_ERROR_HAVE_NO_MEMORY(source);
 291
 292         ndr_err = ndr_pull_struct_blob(val, source,
 293                                        &source->_repsFromBlob,
 294                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
 295         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 296                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
 297                 talloc_free(source);
 298                 return ntstatus_to_werror(nt_status);
 299         }
 300         /* NDR_PRINT_DEBUG(repsFromToBlob, &source->_repsFromBlob); */
 301         if (source->_repsFromBlob.version != 1) {
 302                 talloc_free(source);
 303                 return WERR_DS_DRA_INTERNAL_ERROR;
 304         }
 305
 306         source->partition       = p;
 307         source->repsFrom1       = &source->_repsFromBlob.ctr.ctr1;
 308
 309         status = dreplsrv_out_connection_attach(s, source->repsFrom1, &source->conn);
 310         W_ERROR_NOT_OK_RETURN(status);
 311
 312         if (check_list &&
 313             dreplsrv_find_source_dsa(check_list, &source->repsFrom1->source_dsa_obj_guid)) {
 314                 /* its in the check list, don't add it again */
 315                 talloc_free(source);
 316                 return WERR_OK;
 317         }
 318
 319         /* re-use an existing source if found */
 320         for (s2=*listp; s2; s2=s2->next) {
 321                 if (GUID_compare(&s2->repsFrom1->source_dsa_obj_guid,
 322                                  &source->repsFrom1->source_dsa_obj_guid) == 0) {
 323                         talloc_free(s2->repsFrom1->other_info);
 324                         *s2->repsFrom1 = *source->repsFrom1;
 325                         talloc_steal(s2, s2->repsFrom1->other_info);
 326                         talloc_free(source);
 327                         return WERR_OK;
 328                 }
 329         }
 330
 331         DLIST_ADD_END(*listp, source, struct dreplsrv_partition_source_dsa *);
 332         return WERR_OK;
 333 }
 334
 335 WERROR dreplsrv_partition_find_for_nc(struct dreplsrv_service *s,
 336                                       const struct GUID *nc_guid,
 337                                       const struct dom_sid *nc_sid,
 338                                       const char *nc_dn_str,
 339                                       struct dreplsrv_partition **_p)
 340 {
 341         struct dreplsrv_partition *p;
 342         bool valid_sid, valid_guid;
 343         struct dom_sid null_sid;
 344         ZERO_STRUCT(null_sid);
 345
 346         SMB_ASSERT(_p);
 347
 348         valid_sid  = nc_sid && !dom_sid_equal(&null_sid, nc_sid);
 349         valid_guid = nc_guid && !GUID_all_zero(nc_guid);
 350
 351         if (!valid_sid && !valid_guid && !nc_dn_str) {
 352                 return WERR_DS_DRA_INVALID_PARAMETER;
 353         }
 354
 355         for (p = s->partitions; p; p = p->next) {
 356                 if ((valid_guid && GUID_equal(&p->nc.guid, nc_guid))
 357                     || strequal(p->nc.dn, nc_dn_str)
 358                     || (valid_sid && dom_sid_equal(&p->nc.sid, nc_sid)))
 359                 {
 360                         *_p = p;
 361                         return WERR_OK;
 362                 }
 363         }
 364
 365         return WERR_DS_DRA_BAD_NC;
 366 }
 367
 368 WERROR dreplsrv_partition_source_dsa_by_guid(struct dreplsrv_partition *p,
 369                                              const struct GUID *dsa_guid,
 370                                              struct dreplsrv_partition_source_dsa **_dsa)
 371 {
 372         struct dreplsrv_partition_source_dsa *dsa;
 373
 374         SMB_ASSERT(dsa_guid != NULL);
 375         SMB_ASSERT(!GUID_all_zero(dsa_guid));
 376         SMB_ASSERT(_dsa);
 377
 378         for (dsa = p->sources; dsa; dsa = dsa->next) {
 379                 if (GUID_equal(dsa_guid, &dsa->repsFrom1->source_dsa_obj_guid)) {
 380                         *_dsa = dsa;
 381                         return WERR_OK;
 382                 }
 383         }
 384
 385         return WERR_DS_DRA_NO_REPLICA;
 386 }
 387
 388 WERROR dreplsrv_partition_source_dsa_by_dns(const struct dreplsrv_partition *p,
 389                                             const char *dsa_dns,
 390                                             struct dreplsrv_partition_source_dsa **_dsa)
 391 {
 392         struct dreplsrv_partition_source_dsa *dsa;
 393
 394         SMB_ASSERT(dsa_dns != NULL);
 395         SMB_ASSERT(_dsa);
 396
 397         for (dsa = p->sources; dsa; dsa = dsa->next) {
 398                 if (strequal(dsa_dns, dsa->repsFrom1->other_info->dns_name)) {
 399                         *_dsa = dsa;
 400                         return WERR_OK;
 401                 }
 402         }
 403
 404         return WERR_DS_DRA_NO_REPLICA;
 405 }
 406
 407
 408 /*
 409   create a temporary dsa structure for a replication. This is needed
 410   for the initial replication of a new partition, such as when a new
 411   domain NC is created and we are a global catalog server
 412  */
 413 WERROR dreplsrv_partition_source_dsa_temporary(struct dreplsrv_partition *p,
 414                                                TALLOC_CTX *mem_ctx,
 415                                                const struct GUID *dsa_guid,
 416                                                struct dreplsrv_partition_source_dsa **_dsa)
 417 {
 418         struct dreplsrv_partition_source_dsa *dsa;
 419         WERROR werr;
 420
 421         dsa = talloc_zero(mem_ctx, struct dreplsrv_partition_source_dsa);
 422         W_ERROR_HAVE_NO_MEMORY(dsa);
 423
 424         dsa->partition = p;
 425         dsa->repsFrom1 = &dsa->_repsFromBlob.ctr.ctr1;
 426         dsa->repsFrom1->replica_flags = 0;
 427         dsa->repsFrom1->source_dsa_obj_guid = *dsa_guid;
 428
 429         dsa->repsFrom1->other_info = talloc_zero(dsa, struct repsFromTo1OtherInfo);
 430         W_ERROR_HAVE_NO_MEMORY(dsa->repsFrom1->other_info);
 431
 432         dsa->repsFrom1->other_info->dns_name = samdb_ntds_msdcs_dns_name(p->service->samdb,
 433                                                                          dsa->repsFrom1->other_info, dsa_guid);
 434         W_ERROR_HAVE_NO_MEMORY(dsa->repsFrom1->other_info->dns_name);
 435
 436         werr = dreplsrv_out_connection_attach(p->service, dsa->repsFrom1, &dsa->conn);
 437         if (!W_ERROR_IS_OK(werr)) {
 438                 DEBUG(0,(__location__ ": Failed to attach connection to %s\n",
 439                          ldb_dn_get_linearized(p->dn)));
 440                 talloc_free(dsa);
 441                 return werr;
 442         }
 443
 444         *_dsa = dsa;
 445
 446         return WERR_OK;
 447 }
 448
 449
 450 static WERROR dreplsrv_refresh_partition(struct dreplsrv_service *s,
 451                                          struct dreplsrv_partition *p)
 452 {
 453         WERROR status;
 454         NTSTATUS ntstatus;
 455         struct ldb_message_element *orf_el = NULL;
 456         struct ldb_result *r = NULL;
 457         unsigned int i;
 458         int ret;
 459         TALLOC_CTX *mem_ctx = talloc_new(p);
 460         static const char *attrs[] = {
 461                 "repsFrom",
 462                 "repsTo",
 463                 NULL
 464         };
 465         struct ldb_dn *dn;
 466
 467         DEBUG(4, ("dreplsrv_refresh_partition(%s)\n",
 468                 ldb_dn_get_linearized(p->dn)));
 469
 470         ret = dsdb_search_dn(s->samdb, mem_ctx, &r, p->dn, attrs, DSDB_SEARCH_SHOW_EXTENDED_DN);
 471         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 472                 /* we haven't replicated the partition yet, but we
 473                  * can fill in the guid, sid etc from the partition DN */
 474                 dn = p->dn;
 475         } else if (ret != LDB_SUCCESS) {
 476                 talloc_free(mem_ctx);
 477                 return WERR_FOOBAR;
 478         } else {
 479                 dn = r->msgs[0]->dn;
 480         }
 481
 482         talloc_free(discard_const(p->nc.dn));
 483         ZERO_STRUCT(p->nc);
 484         p->nc.dn        = ldb_dn_alloc_linearized(p, dn);
 485         W_ERROR_HAVE_NO_MEMORY(p->nc.dn);
 486         ntstatus = dsdb_get_extended_dn_guid(dn, &p->nc.guid, "GUID");
 487         if (!NT_STATUS_IS_OK(ntstatus)) {
 488                 DEBUG(0,(__location__ ": unable to get GUID for %s: %s\n",
 489                          p->nc.dn, nt_errstr(ntstatus)));
 490                 talloc_free(mem_ctx);
 491                 return WERR_DS_DRA_INTERNAL_ERROR;
 492         }
 493         dsdb_get_extended_dn_sid(dn, &p->nc.sid, "SID");
 494
 495         talloc_free(p->uptodatevector.cursors);
 496         talloc_free(p->uptodatevector_ex.cursors);
 497         ZERO_STRUCT(p->uptodatevector);
 498         ZERO_STRUCT(p->uptodatevector_ex);
 499
 500         ret = dsdb_load_udv_v2(s->samdb, p->dn, p, &p->uptodatevector.cursors, &p->uptodatevector.count);
 501         if (ret != LDB_SUCCESS) {
 502                 DEBUG(4,(__location__ ": no UDV available for %s\n", ldb_dn_get_linearized(p->dn)));
 503         }
 504
 505         status = WERR_OK;
 506
 507         if (r != NULL && (orf_el = ldb_msg_find_element(r->msgs[0], "repsFrom"))) {
 508                 for (i=0; i < orf_el->num_values; i++) {
 509                         status = dreplsrv_partition_add_source_dsa(s, p, &p->sources,
 510                                                                    NULL, &orf_el->values[i]);
 511                         W_ERROR_NOT_OK_GOTO_DONE(status);
 512                 }
 513         }
 514
 515         if (r != NULL && (orf_el = ldb_msg_find_element(r->msgs[0], "repsTo"))) {
 516                 for (i=0; i < orf_el->num_values; i++) {
 517                         status = dreplsrv_partition_add_source_dsa(s, p, &p->notifies,
 518                                                                    p->sources, &orf_el->values[i]);
 519                         W_ERROR_NOT_OK_GOTO_DONE(status);
 520                 }
 521         }
 522
 523 done:
 524         talloc_free(mem_ctx);
 525         return status;
 526 }
 527
 528 WERROR dreplsrv_refresh_partitions(struct dreplsrv_service *s)
 529 {
 530         WERROR status;
 531         struct dreplsrv_partition *p;
 532
 533         for (p = s->partitions; p; p = p->next) {
 534                 status = dreplsrv_refresh_partition(s, p);
 535                 W_ERROR_NOT_OK_RETURN(status);
 536         }
 537
 538         return WERR_OK;
 539 }