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 "lib/messaging/irpc.h"
  28 #include "dsdb/repl/drepl_service.h"
  29 #include "lib/ldb/include/ldb_errors.h"
  30 #include "../lib/util/dlinklist.h"
  31 #include "librpc/gen_ndr/ndr_misc.h"
  32 #include "librpc/gen_ndr/ndr_drsuapi.h"
  33 #include "librpc/gen_ndr/ndr_drsblobs.h"
  34 #include "libcli/security/dom_sid.h"
  35 #include "param/param.h"
  36
  37 WERROR dreplsrv_load_partitions(struct dreplsrv_service *s)
  38 {
  39         WERROR status;
  40         struct ldb_dn *basedn;
  41         struct ldb_result *r;
  42         struct ldb_message_element *el;
  43         static const char *attrs[] = { "hasMasterNCs", "msDS-hasFullReplicaNCs", NULL };
  44         unsigned int i;
  45         int ret;
  46
  47         basedn = samdb_ntds_settings_dn(s->samdb);
  48         W_ERROR_HAVE_NO_MEMORY(basedn);
  49
  50         ret = ldb_search(s->samdb, s, &r, basedn, LDB_SCOPE_BASE, attrs,
  51                          "(objectClass=*)");
  52         if (ret != LDB_SUCCESS) {
  53                 return WERR_FOOBAR;
  54         } else if (r->count != 1) {
  55                 talloc_free(r);
  56                 return WERR_FOOBAR;
  57         }
  58
  59
  60
  61         el = ldb_msg_find_element(r->msgs[0], "hasMasterNCs");
  62
  63         for (i=0; el && i < el->num_values; i++) {
  64                 const char *v = (const char *)el->values[i].data;
  65                 struct ldb_dn *pdn;
  66                 struct dreplsrv_partition *p;
  67
  68                 pdn = ldb_dn_new(s, s->samdb, v);
  69                 if (!ldb_dn_validate(pdn)) {
  70                         return WERR_FOOBAR;
  71                 }
  72
  73                 p = talloc_zero(s, struct dreplsrv_partition);
  74                 W_ERROR_HAVE_NO_MEMORY(p);
  75
  76                 p->dn = talloc_steal(p, pdn);
  77
  78                 DLIST_ADD(s->partitions, p);
  79
  80                 DEBUG(2, ("dreplsrv_partition[%s] loaded\n", v));
  81         }
  82
  83         el = ldb_msg_find_element(r->msgs[0], "msDS-hasFullReplicaNCs");
  84
  85         for (i=0; el && i < el->num_values; i++) {
  86                 const char *v = (const char *)el->values[i].data;
  87                 struct ldb_dn *pdn;
  88                 struct dreplsrv_partition *p;
  89
  90                 pdn = ldb_dn_new(s, s->samdb, v);
  91                 if (!ldb_dn_validate(pdn)) {
  92                         return WERR_FOOBAR;
  93                 }
  94
  95                 p = talloc_zero(s, struct dreplsrv_partition);
  96                 W_ERROR_HAVE_NO_MEMORY(p);
  97
  98                 p->dn = talloc_steal(p, pdn);
  99                 p->incoming_only = true;
 100
 101                 DLIST_ADD(s->partitions, p);
 102
 103                 DEBUG(2, ("dreplsrv_partition[%s] loaded (incoming only)\n", v));
 104         }
 105
 106         talloc_free(r);
 107
 108         status = dreplsrv_refresh_partitions(s);
 109         W_ERROR_NOT_OK_RETURN(status);
 110
 111         return WERR_OK;
 112 }
 113
 114 WERROR dreplsrv_out_connection_attach(struct dreplsrv_service *s,
 115                                       const struct repsFromTo1 *rft,
 116                                       struct dreplsrv_out_connection **_conn)
 117 {
 118         struct dreplsrv_out_connection *cur, *conn = NULL;
 119         const char *hostname;
 120
 121         if (!rft->other_info) {
 122                 return WERR_FOOBAR;
 123         }
 124
 125         if (!rft->other_info->dns_name) {
 126                 return WERR_FOOBAR;
 127         }
 128
 129         hostname = rft->other_info->dns_name;
 130
 131         for (cur = s->connections; cur; cur = cur->next) {
 132                 if (strcmp(cur->binding->host, hostname) == 0) {
 133                         conn = cur;
 134                         break;
 135                 }
 136         }
 137
 138         if (!conn) {
 139                 NTSTATUS nt_status;
 140                 char *binding_str;
 141
 142                 conn = talloc_zero(s, struct dreplsrv_out_connection);
 143                 W_ERROR_HAVE_NO_MEMORY(conn);
 144
 145                 conn->service   = s;
 146
 147                 binding_str = talloc_asprintf(conn, "ncacn_ip_tcp:%s[krb5,seal]",
 148                                               hostname);
 149                 W_ERROR_HAVE_NO_MEMORY(binding_str);
 150                 nt_status = dcerpc_parse_binding(conn, binding_str, &conn->binding);
 151                 talloc_free(binding_str);
 152                 if (!NT_STATUS_IS_OK(nt_status)) {
 153                         return ntstatus_to_werror(nt_status);
 154                 }
 155
 156                 DLIST_ADD_END(s->connections, conn, struct dreplsrv_out_connection *);
 157
 158                 DEBUG(2,("dreplsrv_out_connection_attach(%s): create\n", conn->binding->host));
 159         } else {
 160                 DEBUG(2,("dreplsrv_out_connection_attach(%s): attach\n", conn->binding->host));
 161         }
 162
 163         *_conn = conn;
 164         return WERR_OK;
 165 }
 166
 167 static WERROR dreplsrv_partition_add_source_dsa(struct dreplsrv_service *s,
 168                                                 struct dreplsrv_partition *p,
 169                                                 const struct ldb_val *val)
 170 {
 171         WERROR status;
 172         enum ndr_err_code ndr_err;
 173         struct dreplsrv_partition_source_dsa *source, *s2;
 174
 175         source = talloc_zero(p, struct dreplsrv_partition_source_dsa);
 176         W_ERROR_HAVE_NO_MEMORY(source);
 177
 178         ndr_err = ndr_pull_struct_blob(val, source,
 179                                        &source->_repsFromBlob,
 180                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
 181         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 182                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
 183                 talloc_free(source);
 184                 return ntstatus_to_werror(nt_status);
 185         }
 186         /* NDR_PRINT_DEBUG(repsFromToBlob, &source->_repsFromBlob); */
 187         if (source->_repsFromBlob.version != 1) {
 188                 talloc_free(source);
 189                 return WERR_DS_DRA_INTERNAL_ERROR;
 190         }
 191
 192         source->partition       = p;
 193         source->repsFrom1       = &source->_repsFromBlob.ctr.ctr1;
 194
 195         status = dreplsrv_out_connection_attach(s, source->repsFrom1, &source->conn);
 196         W_ERROR_NOT_OK_RETURN(status);
 197
 198         /* remove any existing source with the same GUID */
 199         for (s2=p->sources; s2; s2=s2->next) {
 200                 if (GUID_compare(&s2->repsFrom1->source_dsa_obj_guid,
 201                                  &source->repsFrom1->source_dsa_obj_guid) == 0) {
 202                         talloc_free(s2->repsFrom1->other_info);
 203                         *s2->repsFrom1 = *source->repsFrom1;
 204                         talloc_steal(s2, s2->repsFrom1->other_info);
 205                         talloc_free(source);
 206                         return WERR_OK;
 207                 }
 208         }
 209
 210         DLIST_ADD_END(p->sources, source, struct dreplsrv_partition_source_dsa *);
 211         return WERR_OK;
 212 }
 213
 214 WERROR dreplsrv_partition_find_for_nc(struct dreplsrv_service *s,
 215                                       const struct GUID *nc_guid,
 216                                       const struct dom_sid *nc_sid,
 217                                       const char *nc_dn_str,
 218                                       struct dreplsrv_partition **_p)
 219 {
 220         struct dreplsrv_partition *p;
 221         bool valid_sid, valid_guid;
 222         struct dom_sid null_sid;
 223         ZERO_STRUCT(null_sid);
 224
 225         SMB_ASSERT(_p);
 226
 227         valid_sid  = nc_sid && !dom_sid_equal(&null_sid, nc_sid);
 228         valid_guid = nc_guid && !GUID_all_zero(nc_guid);
 229
 230         if (!valid_sid && !valid_guid && !nc_dn_str) {
 231                 return WERR_DS_DRA_INVALID_PARAMETER;
 232         }
 233
 234         for (p = s->partitions; p; p = p->next) {
 235                 if ((valid_guid && GUID_equal(&p->nc.guid, nc_guid))
 236                     || strequal(p->nc.dn, nc_dn_str)
 237                     || (valid_sid && dom_sid_equal(&p->nc.sid, nc_sid)))
 238                 {
 239                         *_p = p;
 240                         return WERR_OK;
 241                 }
 242         }
 243
 244         return WERR_DS_DRA_BAD_NC;
 245 }
 246
 247 WERROR dreplsrv_partition_source_dsa_by_guid(struct dreplsrv_partition *p,
 248                                              const struct GUID *dsa_guid,
 249                                              struct dreplsrv_partition_source_dsa **_dsa)
 250 {
 251         struct dreplsrv_partition_source_dsa *dsa;
 252
 253         SMB_ASSERT(dsa_guid != NULL);
 254         SMB_ASSERT(!GUID_all_zero(dsa_guid));
 255         SMB_ASSERT(_dsa);
 256
 257         for (dsa = p->sources; dsa; dsa = dsa->next) {
 258                 if (GUID_equal(dsa_guid, &dsa->repsFrom1->source_dsa_obj_guid)) {
 259                         *_dsa = dsa;
 260                         return WERR_OK;
 261                 }
 262         }
 263
 264         return WERR_DS_DRA_NO_REPLICA;
 265 }
 266
 267 WERROR dreplsrv_partition_source_dsa_by_dns(const struct dreplsrv_partition *p,
 268                                             const char *dsa_dns,
 269                                             struct dreplsrv_partition_source_dsa **_dsa)
 270 {
 271         struct dreplsrv_partition_source_dsa *dsa;
 272
 273         SMB_ASSERT(dsa_dns != NULL);
 274         SMB_ASSERT(_dsa);
 275
 276         for (dsa = p->sources; dsa; dsa = dsa->next) {
 277                 if (strequal(dsa_dns, dsa->repsFrom1->other_info->dns_name)) {
 278                         *_dsa = dsa;
 279                         return WERR_OK;
 280                 }
 281         }
 282
 283         return WERR_DS_DRA_NO_REPLICA;
 284 }
 285
 286
 287 static WERROR dreplsrv_refresh_partition(struct dreplsrv_service *s,
 288                                          struct dreplsrv_partition *p)
 289 {
 290         WERROR status;
 291         struct dom_sid *nc_sid;
 292         struct ldb_message_element *orf_el = NULL;
 293         struct ldb_result *r;
 294         unsigned int i;
 295         int ret;
 296         TALLOC_CTX *mem_ctx = talloc_new(p);
 297         static const char *attrs[] = {
 298                 "objectSid",
 299                 "objectGUID",
 300                 "repsFrom",
 301                 NULL
 302         };
 303
 304         DEBUG(2, ("dreplsrv_refresh_partition(%s)\n",
 305                 ldb_dn_get_linearized(p->dn)));
 306
 307         ret = ldb_search(s->samdb, mem_ctx, &r, p->dn, LDB_SCOPE_BASE, attrs,
 308                          "(objectClass=*)");
 309         if (ret != LDB_SUCCESS) {
 310                 talloc_free(mem_ctx);
 311                 return WERR_FOOBAR;
 312         }
 313
 314         talloc_free(discard_const(p->nc.dn));
 315         ZERO_STRUCT(p->nc);
 316         p->nc.dn        = ldb_dn_alloc_linearized(p, p->dn);
 317         W_ERROR_HAVE_NO_MEMORY(p->nc.dn);
 318         p->nc.guid      = samdb_result_guid(r->msgs[0], "objectGUID");
 319         nc_sid          = samdb_result_dom_sid(p, r->msgs[0], "objectSid");
 320         if (nc_sid) {
 321                 p->nc.sid       = *nc_sid;
 322                 talloc_free(nc_sid);
 323         }
 324
 325         talloc_free(p->uptodatevector.cursors);
 326         talloc_free(p->uptodatevector_ex.cursors);
 327         ZERO_STRUCT(p->uptodatevector);
 328         ZERO_STRUCT(p->uptodatevector_ex);
 329
 330         ret = dsdb_load_udv_v2(s->samdb, p->dn, p, &p->uptodatevector.cursors, &p->uptodatevector.count);
 331         if (ret != LDB_SUCCESS) {
 332                 DEBUG(4,(__location__ ": no UDV available for %s\n", ldb_dn_get_linearized(p->dn)));
 333         }
 334
 335         orf_el = ldb_msg_find_element(r->msgs[0], "repsFrom");
 336         if (orf_el) {
 337                 for (i=0; i < orf_el->num_values; i++) {
 338                         status = dreplsrv_partition_add_source_dsa(s, p, &orf_el->values[i]);
 339                         W_ERROR_NOT_OK_RETURN(status);
 340                 }
 341         }
 342
 343         talloc_free(mem_ctx);
 344
 345         return WERR_OK;
 346 }
 347
 348 WERROR dreplsrv_refresh_partitions(struct dreplsrv_service *s)
 349 {
 350         WERROR status;
 351         struct dreplsrv_partition *p;
 352
 353         for (p = s->partitions; p; p = p->next) {
 354                 status = dreplsrv_refresh_partition(s, p);
 355                 W_ERROR_NOT_OK_RETURN(status);
 356         }
 357
 358         return WERR_OK;
 359 }