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
  36 WERROR dreplsrv_load_partitions(struct dreplsrv_service *s)
  37 {
  38         WERROR status;
  39         static const char *attrs[] = { "namingContexts", NULL };
  40         unsigned int i;
  41         int ret;
  42         TALLOC_CTX *tmp_ctx;
  43         struct ldb_result *res;
  44         struct ldb_message_element *el;
  45
  46         tmp_ctx = talloc_new(s);
  47         W_ERROR_HAVE_NO_MEMORY(tmp_ctx);
  48
  49         ret = ldb_search(s->samdb, tmp_ctx, &res,
  50                          ldb_dn_new(tmp_ctx, s->samdb, ""), LDB_SCOPE_BASE, attrs, NULL);
  51         if (ret != LDB_SUCCESS) {
  52                 DEBUG(1,("Searching for namingContexts in rootDSE failed: %s\n", ldb_errstring(s->samdb)));
  53                 talloc_free(tmp_ctx);
  54                 return WERR_DS_DRA_INTERNAL_ERROR;
  55        }
  56
  57        el = ldb_msg_find_element(res->msgs[0], "namingContexts");
  58        if (!el) {
  59                DEBUG(1,("Finding namingContexts element in root_res failed: %s\n",
  60                         ldb_errstring(s->samdb)));
  61                talloc_free(tmp_ctx);
  62                return WERR_DS_DRA_INTERNAL_ERROR;
  63        }
  64
  65        for (i=0; i<el->num_values; i++) {
  66                struct ldb_dn *pdn;
  67                struct dreplsrv_partition *p;
  68
  69                pdn = ldb_dn_from_ldb_val(tmp_ctx, s->samdb, &el->values[i]);
  70                if (pdn == NULL) {
  71                        talloc_free(tmp_ctx);
  72                        return WERR_DS_DRA_INTERNAL_ERROR;
  73                }
  74                if (!ldb_dn_validate(pdn)) {
  75                        return WERR_DS_DRA_INTERNAL_ERROR;
  76                }
  77
  78                p = talloc_zero(s, struct dreplsrv_partition);
  79                W_ERROR_HAVE_NO_MEMORY(p);
  80
  81                p->dn = talloc_steal(p, pdn);
  82
  83                DLIST_ADD(s->partitions, p);
  84
  85                DEBUG(2, ("dreplsrv_partition[%s] loaded\n", ldb_dn_get_linearized(p->dn)));
  86         }
  87
  88         talloc_free(tmp_ctx);
  89
  90         status = dreplsrv_refresh_partitions(s);
  91         W_ERROR_NOT_OK_RETURN(status);
  92
  93         return WERR_OK;
  94 }
  95
  96 /*
  97   work out the principal to use for DRS replication connections
  98  */
  99 NTSTATUS dreplsrv_get_target_principal(struct dreplsrv_service *s,
 100                                        TALLOC_CTX *mem_ctx,
 101                                        const struct repsFromTo1 *rft,
 102                                        const char **target_principal)
 103 {
 104         TALLOC_CTX *tmp_ctx;
 105         struct ldb_result *res;
 106         const char *attrs[] = { "dNSHostName", NULL };
 107         int ret;
 108         const char *hostname;
 109         struct ldb_dn *dn;
 110
 111         *target_principal = NULL;
 112
 113         tmp_ctx = talloc_new(mem_ctx);
 114
 115         /* we need to find their hostname */
 116         ret = dsdb_find_dn_by_guid(s->samdb, tmp_ctx, &rft->source_dsa_obj_guid, &dn);
 117         if (ret != LDB_SUCCESS) {
 118                 talloc_free(tmp_ctx);
 119                 /* its OK for their NTDSDSA DN not to be in our database */
 120                 return NT_STATUS_OK;
 121         }
 122
 123         /* strip off the NTDS Settings */
 124         if (!ldb_dn_remove_child_components(dn, 1)) {
 125                 talloc_free(tmp_ctx);
 126                 return NT_STATUS_OK;
 127         }
 128
 129         ret = dsdb_search_dn(s->samdb, tmp_ctx, &res, dn, attrs, 0);
 130         if (ret != LDB_SUCCESS) {
 131                 talloc_free(tmp_ctx);
 132                 /* its OK for their account DN not to be in our database */
 133                 return NT_STATUS_OK;
 134         }
 135
 136         hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
 137         if (hostname == NULL) {
 138                 talloc_free(tmp_ctx);
 139                 /* its OK to not have a dnshostname */
 140                 return NT_STATUS_OK;
 141         }
 142
 143         /* All DCs have the GC/hostname/realm name, but if some of the
 144          * preconditions are not satisfied, then we will fall back to
 145          * the
 146          * E3514235-4B06-11D1-AB04-00C04FC2DCD2/${NTDSGUID}/${DNSDOMAIN}
 147          * name.  This means that if a AD server has a dnsHostName set
 148          * on it's record, it must also have GC/hostname/realm
 149          * servicePrincipalName */
 150
 151         *target_principal = talloc_asprintf(mem_ctx, "GC/%s/%s",
 152                                             hostname,
 153                                             lpcfg_dnsdomain(s->task->lp_ctx));
 154         talloc_free(tmp_ctx);
 155         return NT_STATUS_OK;
 156 }
 157
 158
 159 WERROR dreplsrv_out_connection_attach(struct dreplsrv_service *s,
 160                                       const struct repsFromTo1 *rft,
 161                                       struct dreplsrv_out_connection **_conn)
 162 {
 163         struct dreplsrv_out_connection *cur, *conn = NULL;
 164         const char *hostname;
 165
 166         if (!rft->other_info) {
 167                 return WERR_FOOBAR;
 168         }
 169
 170         if (!rft->other_info->dns_name) {
 171                 return WERR_FOOBAR;
 172         }
 173
 174         hostname = rft->other_info->dns_name;
 175
 176         for (cur = s->connections; cur; cur = cur->next) {
 177                 if (strcmp(cur->binding->host, hostname) == 0) {
 178                         conn = cur;
 179                         break;
 180                 }
 181         }
 182
 183         if (!conn) {
 184                 NTSTATUS nt_status;
 185                 char *binding_str;
 186
 187                 conn = talloc_zero(s, struct dreplsrv_out_connection);
 188                 W_ERROR_HAVE_NO_MEMORY(conn);
 189
 190                 conn->service   = s;
 191
 192                 binding_str = talloc_asprintf(conn, "ncacn_ip_tcp:%s[krb5,seal]",
 193                                               hostname);
 194                 W_ERROR_HAVE_NO_MEMORY(binding_str);
 195                 nt_status = dcerpc_parse_binding(conn, binding_str, &conn->binding);
 196                 talloc_free(binding_str);
 197                 if (!NT_STATUS_IS_OK(nt_status)) {
 198                         return ntstatus_to_werror(nt_status);
 199                 }
 200
 201                 /* use the GC principal for DRS replication */
 202                 nt_status = dreplsrv_get_target_principal(s, conn->binding,
 203                                                           rft, &conn->binding->target_principal);
 204                 if (!NT_STATUS_IS_OK(nt_status)) {
 205                         return ntstatus_to_werror(nt_status);
 206                 }
 207
 208                 DLIST_ADD_END(s->connections, conn, struct dreplsrv_out_connection *);
 209
 210                 DEBUG(4,("dreplsrv_out_connection_attach(%s): create\n", conn->binding->host));
 211         } else {
 212                 DEBUG(4,("dreplsrv_out_connection_attach(%s): attach\n", conn->binding->host));
 213         }
 214
 215         *_conn = conn;
 216         return WERR_OK;
 217 }
 218
 219 /*
 220   find an existing source dsa in a list
 221  */
 222 static struct dreplsrv_partition_source_dsa *dreplsrv_find_source_dsa(struct dreplsrv_partition_source_dsa *list,
 223                                                                       struct GUID *guid)
 224 {
 225         struct dreplsrv_partition_source_dsa *s;
 226         for (s=list; s; s=s->next) {
 227                 if (GUID_compare(&s->repsFrom1->source_dsa_obj_guid, guid) == 0) {
 228                         return s;
 229                 }
 230         }
 231         return NULL;
 232 }
 233
 234
 235
 236 static WERROR dreplsrv_partition_add_source_dsa(struct dreplsrv_service *s,
 237                                                 struct dreplsrv_partition *p,
 238                                                 struct dreplsrv_partition_source_dsa **listp,
 239                                                 struct dreplsrv_partition_source_dsa *check_list,
 240                                                 const struct ldb_val *val)
 241 {
 242         WERROR status;
 243         enum ndr_err_code ndr_err;
 244         struct dreplsrv_partition_source_dsa *source, *s2;
 245
 246         source = talloc_zero(p, struct dreplsrv_partition_source_dsa);
 247         W_ERROR_HAVE_NO_MEMORY(source);
 248
 249         ndr_err = ndr_pull_struct_blob(val, source,
 250                                        &source->_repsFromBlob,
 251                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
 252         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 253                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
 254                 talloc_free(source);
 255                 return ntstatus_to_werror(nt_status);
 256         }
 257         /* NDR_PRINT_DEBUG(repsFromToBlob, &source->_repsFromBlob); */
 258         if (source->_repsFromBlob.version != 1) {
 259                 talloc_free(source);
 260                 return WERR_DS_DRA_INTERNAL_ERROR;
 261         }
 262
 263         source->partition       = p;
 264         source->repsFrom1       = &source->_repsFromBlob.ctr.ctr1;
 265
 266         status = dreplsrv_out_connection_attach(s, source->repsFrom1, &source->conn);
 267         W_ERROR_NOT_OK_RETURN(status);
 268
 269         if (check_list &&
 270             dreplsrv_find_source_dsa(check_list, &source->repsFrom1->source_dsa_obj_guid)) {
 271                 /* its in the check list, don't add it again */
 272                 talloc_free(source);
 273                 return WERR_OK;
 274         }
 275
 276         /* re-use an existing source if found */
 277         for (s2=*listp; s2; s2=s2->next) {
 278                 if (GUID_compare(&s2->repsFrom1->source_dsa_obj_guid,
 279                                  &source->repsFrom1->source_dsa_obj_guid) == 0) {
 280                         talloc_free(s2->repsFrom1->other_info);
 281                         *s2->repsFrom1 = *source->repsFrom1;
 282                         talloc_steal(s2, s2->repsFrom1->other_info);
 283                         talloc_free(source);
 284                         return WERR_OK;
 285                 }
 286         }
 287
 288         DLIST_ADD_END(*listp, source, struct dreplsrv_partition_source_dsa *);
 289         return WERR_OK;
 290 }
 291
 292 WERROR dreplsrv_partition_find_for_nc(struct dreplsrv_service *s,
 293                                       const struct GUID *nc_guid,
 294                                       const struct dom_sid *nc_sid,
 295                                       const char *nc_dn_str,
 296                                       struct dreplsrv_partition **_p)
 297 {
 298         struct dreplsrv_partition *p;
 299         bool valid_sid, valid_guid;
 300         struct dom_sid null_sid;
 301         ZERO_STRUCT(null_sid);
 302
 303         SMB_ASSERT(_p);
 304
 305         valid_sid  = nc_sid && !dom_sid_equal(&null_sid, nc_sid);
 306         valid_guid = nc_guid && !GUID_all_zero(nc_guid);
 307
 308         if (!valid_sid && !valid_guid && !nc_dn_str) {
 309                 return WERR_DS_DRA_INVALID_PARAMETER;
 310         }
 311
 312         for (p = s->partitions; p; p = p->next) {
 313                 if ((valid_guid && GUID_equal(&p->nc.guid, nc_guid))
 314                     || strequal(p->nc.dn, nc_dn_str)
 315                     || (valid_sid && dom_sid_equal(&p->nc.sid, nc_sid)))
 316                 {
 317                         *_p = p;
 318                         return WERR_OK;
 319                 }
 320         }
 321
 322         return WERR_DS_DRA_BAD_NC;
 323 }
 324
 325 WERROR dreplsrv_partition_source_dsa_by_guid(struct dreplsrv_partition *p,
 326                                              const struct GUID *dsa_guid,
 327                                              struct dreplsrv_partition_source_dsa **_dsa)
 328 {
 329         struct dreplsrv_partition_source_dsa *dsa;
 330
 331         SMB_ASSERT(dsa_guid != NULL);
 332         SMB_ASSERT(!GUID_all_zero(dsa_guid));
 333         SMB_ASSERT(_dsa);
 334
 335         for (dsa = p->sources; dsa; dsa = dsa->next) {
 336                 if (GUID_equal(dsa_guid, &dsa->repsFrom1->source_dsa_obj_guid)) {
 337                         *_dsa = dsa;
 338                         return WERR_OK;
 339                 }
 340         }
 341
 342         return WERR_DS_DRA_NO_REPLICA;
 343 }
 344
 345 WERROR dreplsrv_partition_source_dsa_by_dns(const struct dreplsrv_partition *p,
 346                                             const char *dsa_dns,
 347                                             struct dreplsrv_partition_source_dsa **_dsa)
 348 {
 349         struct dreplsrv_partition_source_dsa *dsa;
 350
 351         SMB_ASSERT(dsa_dns != NULL);
 352         SMB_ASSERT(_dsa);
 353
 354         for (dsa = p->sources; dsa; dsa = dsa->next) {
 355                 if (strequal(dsa_dns, dsa->repsFrom1->other_info->dns_name)) {
 356                         *_dsa = dsa;
 357                         return WERR_OK;
 358                 }
 359         }
 360
 361         return WERR_DS_DRA_NO_REPLICA;
 362 }
 363
 364
 365 static WERROR dreplsrv_refresh_partition(struct dreplsrv_service *s,
 366                                          struct dreplsrv_partition *p)
 367 {
 368         WERROR status;
 369         struct dom_sid *nc_sid;
 370         struct ldb_message_element *orf_el = NULL;
 371         struct ldb_result *r;
 372         unsigned int i;
 373         int ret;
 374         TALLOC_CTX *mem_ctx = talloc_new(p);
 375         static const char *attrs[] = {
 376                 "objectSid",
 377                 "objectGUID",
 378                 "repsFrom",
 379                 "repsTo",
 380                 NULL
 381         };
 382
 383         DEBUG(4, ("dreplsrv_refresh_partition(%s)\n",
 384                 ldb_dn_get_linearized(p->dn)));
 385
 386         ret = ldb_search(s->samdb, mem_ctx, &r, p->dn, LDB_SCOPE_BASE, attrs,
 387                          "(objectClass=*)");
 388         if (ret != LDB_SUCCESS) {
 389                 talloc_free(mem_ctx);
 390                 return WERR_FOOBAR;
 391         }
 392
 393         talloc_free(discard_const(p->nc.dn));
 394         ZERO_STRUCT(p->nc);
 395         p->nc.dn        = ldb_dn_alloc_linearized(p, p->dn);
 396         W_ERROR_HAVE_NO_MEMORY(p->nc.dn);
 397         p->nc.guid      = samdb_result_guid(r->msgs[0], "objectGUID");
 398         nc_sid          = samdb_result_dom_sid(p, r->msgs[0], "objectSid");
 399         if (nc_sid) {
 400                 p->nc.sid       = *nc_sid;
 401                 talloc_free(nc_sid);
 402         }
 403
 404         talloc_free(p->uptodatevector.cursors);
 405         talloc_free(p->uptodatevector_ex.cursors);
 406         ZERO_STRUCT(p->uptodatevector);
 407         ZERO_STRUCT(p->uptodatevector_ex);
 408
 409         ret = dsdb_load_udv_v2(s->samdb, p->dn, p, &p->uptodatevector.cursors, &p->uptodatevector.count);
 410         if (ret != LDB_SUCCESS) {
 411                 DEBUG(4,(__location__ ": no UDV available for %s\n", ldb_dn_get_linearized(p->dn)));
 412         }
 413
 414         orf_el = ldb_msg_find_element(r->msgs[0], "repsFrom");
 415         if (orf_el) {
 416                 for (i=0; i < orf_el->num_values; i++) {
 417                         status = dreplsrv_partition_add_source_dsa(s, p, &p->sources,
 418                                                                    NULL, &orf_el->values[i]);
 419                         W_ERROR_NOT_OK_RETURN(status);
 420                 }
 421         }
 422
 423         orf_el = ldb_msg_find_element(r->msgs[0], "repsTo");
 424         if (orf_el) {
 425                 for (i=0; i < orf_el->num_values; i++) {
 426                         status = dreplsrv_partition_add_source_dsa(s, p, &p->notifies,
 427                                                                    p->sources, &orf_el->values[i]);
 428                         W_ERROR_NOT_OK_RETURN(status);
 429                 }
 430         }
 431
 432         talloc_free(mem_ctx);
 433
 434         return WERR_OK;
 435 }
 436
 437 WERROR dreplsrv_refresh_partitions(struct dreplsrv_service *s)
 438 {
 439         WERROR status;
 440         struct dreplsrv_partition *p;
 441
 442         for (p = s->partitions; p; p = p->next) {
 443                 status = dreplsrv_refresh_partition(s, p);
 444                 W_ERROR_NOT_OK_RETURN(status);
 445         }
 446
 447         return WERR_OK;
 448 }