source4/rpc_server/drsuapi/updaterefs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    implement the DRSUpdateRefs call
   5
   6    Copyright (C) Andrew Tridgell 2009
   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 "rpc_server/dcerpc_server.h"
  24 #include "dsdb/samdb/samdb.h"
  25 #include "libcli/security/security.h"
  26 #include "libcli/security/session.h"
  27 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
  28 #include "auth/session.h"
  29 #include "librpc/gen_ndr/ndr_drsuapi.h"
  30 #include "librpc/gen_ndr/ndr_irpc_c.h"
  31 #include "lib/messaging/irpc.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS            DBGC_DRS_REPL
  35
  36 struct repsTo {
  37         uint32_t count;
  38         struct repsFromToBlob *r;
  39 };
  40
  41 static WERROR uref_check_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
  42                               struct ldb_dn *dn, struct GUID *dest_guid,
  43                               uint32_t options)
  44 {
  45         struct repsTo reps;
  46         WERROR werr;
  47         unsigned int i;
  48         bool found = false;
  49
  50         werr = dsdb_loadreps(sam_ctx, mem_ctx, dn, "repsTo", &reps.r, &reps.count);
  51         if (!W_ERROR_IS_OK(werr)) {
  52                 return werr;
  53         }
  54
  55         for (i=0; i<reps.count; i++) {
  56                 if (GUID_equal(dest_guid,
  57                                &reps.r[i].ctr.ctr1.source_dsa_obj_guid)) {
  58                         found = true;
  59                         break;
  60                 }
  61         }
  62
  63         if (options & DRSUAPI_DRS_ADD_REF) {
  64                 if (found && !(options & DRSUAPI_DRS_DEL_REF)) {
  65                         return WERR_DS_DRA_REF_ALREADY_EXISTS;
  66                 }
  67         }
  68
  69         if (options & DRSUAPI_DRS_DEL_REF) {
  70                 if (!found && !(options & DRSUAPI_DRS_ADD_REF)) {
  71                         return WERR_DS_DRA_REF_NOT_FOUND;
  72                 }
  73         }
  74
  75         return WERR_OK;
  76 }
  77
  78 /*
  79   add a replication destination for a given partition GUID
  80  */
  81 static WERROR uref_add_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
  82                             struct ldb_dn *dn, struct repsFromTo1 *dest,
  83                             uint32_t options)
  84 {
  85         struct repsTo reps;
  86         WERROR werr;
  87         unsigned int i;
  88
  89         werr = dsdb_loadreps(sam_ctx, mem_ctx, dn, "repsTo", &reps.r, &reps.count);
  90         if (!W_ERROR_IS_OK(werr)) {
  91                 return werr;
  92         }
  93
  94         for (i=0; i<reps.count; i++) {
  95                 if (GUID_equal(&dest->source_dsa_obj_guid,
  96                                &reps.r[i].ctr.ctr1.source_dsa_obj_guid)) {
  97                         if (options & DRSUAPI_DRS_GETCHG_CHECK) {
  98                                 return WERR_OK;
  99                         } else {
 100                                 return WERR_DS_DRA_REF_ALREADY_EXISTS;
 101                         }
 102                 }
 103         }
 104
 105         reps.r = talloc_realloc(mem_ctx, reps.r, struct repsFromToBlob, reps.count+1);
 106         if (reps.r == NULL) {
 107                 return WERR_DS_DRA_INTERNAL_ERROR;
 108         }
 109         ZERO_STRUCT(reps.r[reps.count]);
 110         reps.r[reps.count].version = 1;
 111         reps.r[reps.count].ctr.ctr1 = *dest;
 112         /* add the GCSPN flag if the client asked for it */
 113         reps.r[reps.count].ctr.ctr1.replica_flags |= (options & DRSUAPI_DRS_REF_GCSPN);
 114         reps.count++;
 115
 116         werr = dsdb_savereps(sam_ctx, mem_ctx, dn, "repsTo", reps.r, reps.count);
 117         if (!W_ERROR_IS_OK(werr)) {
 118                 return werr;
 119         }
 120
 121         return WERR_OK;
 122 }
 123
 124 /*
 125   delete a replication destination for a given partition GUID
 126  */
 127 static WERROR uref_del_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
 128                             struct ldb_dn *dn, struct GUID *dest_guid,
 129                             uint32_t options)
 130 {
 131         struct repsTo reps;
 132         WERROR werr;
 133         unsigned int i;
 134         bool found = false;
 135
 136         werr = dsdb_loadreps(sam_ctx, mem_ctx, dn, "repsTo", &reps.r, &reps.count);
 137         if (!W_ERROR_IS_OK(werr)) {
 138                 return werr;
 139         }
 140
 141         for (i=0; i<reps.count; i++) {
 142                 if (GUID_equal(dest_guid,
 143                                &reps.r[i].ctr.ctr1.source_dsa_obj_guid)) {
 144                         if (i+1 < reps.count) {
 145                                 memmove(&reps.r[i], &reps.r[i+1], sizeof(reps.r[i])*(reps.count-(i+1)));
 146                         }
 147                         /*
 148                          * If we remove an element, decrement i so that we don't
 149                          * skip over the element following.
 150                          */
 151                         i--;
 152                         reps.count--;
 153                         found = true;
 154                 }
 155         }
 156
 157         werr = dsdb_savereps(sam_ctx, mem_ctx, dn, "repsTo", reps.r, reps.count);
 158         if (!W_ERROR_IS_OK(werr)) {
 159                 return werr;
 160         }
 161
 162         if (!found &&
 163             !(options & DRSUAPI_DRS_GETCHG_CHECK) &&
 164             !(options & DRSUAPI_DRS_ADD_REF)) {
 165                 return WERR_DS_DRA_REF_NOT_FOUND;
 166         }
 167
 168         return WERR_OK;
 169 }
 170
 171 struct drepl_refresh_state {
 172         struct dreplsrv_refresh r;
 173 };
 174
 175 /**
 176  * @brief Update the references for the given NC and the destination DSA object
 177  *
 178  * This function is callable from non RPC functions (ie. getncchanges), it
 179  * will validate the request to update reference and then will add/del a repsTo
 180  * to the specified server referenced by its DSA GUID in the request.
 181  *
 182  * @param[in]       msg_ctx          Messaging context for sending partition
 183  *                                   refresh in dreplsrv
 184  *
 185  * @param[in]       b_state          A bind_state object
 186  *
 187  * @param[in]       mem_ctx          A talloc context for memory allocation
 188  *
 189  * @param[in]       req              A drsuapi_DsReplicaUpdateRefsRequest1
 190  *                                   object which NC, which server and which
 191  *                                   action (add/delete) should be performed
 192  *
 193  * @return                           WERR_OK is success, different error
 194  *                                   otherwise.
 195  */
 196 WERROR drsuapi_UpdateRefs(struct imessaging_context *msg_ctx,
 197                           struct tevent_context *event_ctx,
 198                           struct drsuapi_bind_state *b_state, TALLOC_CTX *mem_ctx,
 199                           struct drsuapi_DsReplicaUpdateRefsRequest1 *req)
 200 {
 201         WERROR werr;
 202         int ret;
 203         struct ldb_dn *dn_normalised;
 204         struct ldb_dn *nc_root;
 205         struct ldb_context *sam_ctx = b_state->sam_ctx_system?b_state->sam_ctx_system:b_state->sam_ctx;
 206         struct dcerpc_binding_handle *irpc_handle;
 207         struct tevent_req *subreq;
 208         struct drepl_refresh_state *state;
 209
 210
 211         DEBUG(4,("DsReplicaUpdateRefs for host '%s' with GUID %s options 0x%08x nc=%s\n",
 212                  req->dest_dsa_dns_name, GUID_string(mem_ctx, &req->dest_dsa_guid),
 213                  req->options,
 214                  drs_ObjectIdentifier_to_debug_string(mem_ctx, req->naming_context)));
 215
 216         /*
 217          * 4.1.26.2 Server Behavior of the IDL_DRSUpdateRefs Method
 218          * Implements the input validation checks
 219          */
 220         if (GUID_all_zero(&req->dest_dsa_guid)) {
 221                 return WERR_DS_DRA_INVALID_PARAMETER;
 222         }
 223
 224         /* FIXME it seems that we should check the length of the stuff too*/
 225         if (req->dest_dsa_dns_name == NULL) {
 226                 return WERR_DS_DRA_INVALID_PARAMETER;
 227         }
 228
 229         if (!(req->options & (DRSUAPI_DRS_DEL_REF|DRSUAPI_DRS_ADD_REF))) {
 230                 return WERR_DS_DRA_INVALID_PARAMETER;
 231         }
 232
 233         ret = drs_ObjectIdentifier_to_dn_and_nc_root(mem_ctx, sam_ctx, req->naming_context,
 234                                                      &dn_normalised, &nc_root);
 235         if (ret != LDB_SUCCESS) {
 236                 DBG_WARNING("Didn't find a nc for %s: %s\n",
 237                             drs_ObjectIdentifier_to_debug_string(mem_ctx,
 238                                                                  req->naming_context),
 239                             ldb_errstring(sam_ctx));
 240                 return WERR_DS_DRA_BAD_NC;
 241         }
 242         if (ldb_dn_compare(dn_normalised, nc_root) != 0) {
 243                 DBG_NOTICE("dn %s is not equal to %s (from %s)\n",
 244                            ldb_dn_get_linearized(dn_normalised),
 245                            ldb_dn_get_linearized(nc_root),
 246                            drs_ObjectIdentifier_to_debug_string(mem_ctx,
 247                                                                 req->naming_context));
 248                 return WERR_DS_DRA_BAD_NC;
 249         }
 250
 251         /*
 252          * First check without a transaction open.
 253          *
 254          * This means that in the usual case, it will never open it and never
 255          * bother to refresh the dreplsrv.
 256          */
 257         werr = uref_check_dest(sam_ctx,
 258                                mem_ctx,
 259                                dn_normalised,
 260                                &req->dest_dsa_guid,
 261                                req->options);
 262         if (W_ERROR_EQUAL(werr, WERR_DS_DRA_REF_ALREADY_EXISTS) ||
 263             W_ERROR_EQUAL(werr, WERR_DS_DRA_REF_NOT_FOUND)) {
 264                 if (req->options & DRSUAPI_DRS_GETCHG_CHECK) {
 265                         return WERR_OK;
 266                 }
 267                 return werr;
 268         }
 269
 270         if (ldb_transaction_start(sam_ctx) != LDB_SUCCESS) {
 271                 DEBUG(0,(__location__ ": Failed to start transaction on samdb: %s\n",
 272                          ldb_errstring(sam_ctx)));
 273                 return WERR_DS_DRA_INTERNAL_ERROR;
 274         }
 275
 276         if (req->options & DRSUAPI_DRS_DEL_REF) {
 277                 werr = uref_del_dest(sam_ctx,
 278                                      mem_ctx,
 279                                      dn_normalised,
 280                                      &req->dest_dsa_guid,
 281                                      req->options);
 282                 if (!W_ERROR_IS_OK(werr)) {
 283                         DEBUG(0,("Failed to delete repsTo for %s: %s\n",
 284                                  GUID_string(mem_ctx, &req->dest_dsa_guid),
 285                                  win_errstr(werr)));
 286                         goto failed;
 287                 }
 288         }
 289
 290         if (req->options & DRSUAPI_DRS_ADD_REF) {
 291                 struct repsFromTo1 dest;
 292                 struct repsFromTo1OtherInfo oi;
 293
 294                 ZERO_STRUCT(dest);
 295                 ZERO_STRUCT(oi);
 296
 297                 oi.dns_name = req->dest_dsa_dns_name;
 298                 dest.other_info          = &oi;
 299                 dest.source_dsa_obj_guid = req->dest_dsa_guid;
 300                 dest.replica_flags       = req->options;
 301
 302                 werr = uref_add_dest(sam_ctx,
 303                                      mem_ctx,
 304                                      dn_normalised,
 305                                      &dest,
 306                                      req->options);
 307                 if (!W_ERROR_IS_OK(werr)) {
 308                         DEBUG(0,("Failed to add repsTo for %s: %s\n",
 309                                  GUID_string(mem_ctx, &dest.source_dsa_obj_guid),
 310                                  win_errstr(werr)));
 311                         goto failed;
 312                 }
 313         }
 314
 315         if (ldb_transaction_commit(sam_ctx) != LDB_SUCCESS) {
 316                 DEBUG(0,(__location__ ": Failed to commit transaction on samdb: %s\n",
 317                          ldb_errstring(sam_ctx)));
 318                 return WERR_DS_DRA_INTERNAL_ERROR;
 319         }
 320
 321         state = talloc_zero(mem_ctx, struct drepl_refresh_state);
 322         if (state == NULL) {
 323                 return WERR_OK;
 324         }
 325
 326         irpc_handle = irpc_binding_handle_by_name(mem_ctx, msg_ctx,
 327                                                   "dreplsrv", &ndr_table_irpc);
 328         if (irpc_handle == NULL) {
 329                 /* dreplsrv is not running yet */
 330                 TALLOC_FREE(state);
 331                 return WERR_OK;
 332         }
 333
 334         /*
 335          * [Taken from auth_sam_trigger_repl_secret in auth_sam.c]
 336          *
 337          * This seem to rely on the current IRPC implementation,
 338          * which delivers the message in the _send function.
 339          *
 340          * TODO: we need a ONE_WAY IRPC handle and register
 341          * a callback and wait for it to be triggered!
 342          */
 343         subreq = dcerpc_dreplsrv_refresh_r_send(state, event_ctx,
 344                                                 irpc_handle, &state->r);
 345         TALLOC_FREE(subreq);
 346         TALLOC_FREE(state);
 347
 348         return WERR_OK;
 349
 350 failed:
 351         ldb_transaction_cancel(sam_ctx);
 352         return werr;
 353 }
 354
 355 /*
 356   drsuapi_DsReplicaUpdateRefs
 357 */
 358 WERROR dcesrv_drsuapi_DsReplicaUpdateRefs(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
 359                                           struct drsuapi_DsReplicaUpdateRefs *r)
 360 {
 361         struct auth_session_info *session_info =
 362                 dcesrv_call_session_info(dce_call);
 363         struct imessaging_context *imsg_ctx =
 364                 dcesrv_imessaging_context(dce_call->conn);
 365         struct dcesrv_handle *h;
 366         struct drsuapi_bind_state *b_state;
 367         struct drsuapi_DsReplicaUpdateRefsRequest1 *req;
 368         WERROR werr;
 369         int ret;
 370         enum security_user_level security_level;
 371
 372         DCESRV_PULL_HANDLE_WERR(h, r->in.bind_handle, DRSUAPI_BIND_HANDLE);
 373         b_state = h->data;
 374
 375         if (r->in.level != 1) {
 376                 DEBUG(0,("DrReplicUpdateRefs - unsupported level %u\n", r->in.level));
 377                 return WERR_DS_DRA_INVALID_PARAMETER;
 378         }
 379         req = &r->in.req.req1;
 380         werr = drs_security_access_check(b_state->sam_ctx,
 381                                          mem_ctx,
 382                                          session_info->security_token,
 383                                          req->naming_context,
 384                                          GUID_DRS_MANAGE_TOPOLOGY);
 385
 386         if (!W_ERROR_IS_OK(werr)) {
 387                 return werr;
 388         }
 389
 390         security_level = security_session_user_level(session_info, NULL);
 391         if (security_level < SECURITY_ADMINISTRATOR) {
 392                 /* check that they are using an DSA objectGUID that they own */
 393                 ret = dsdb_validate_dsa_guid(b_state->sam_ctx,
 394                                              &req->dest_dsa_guid,
 395                                              &session_info->security_token->sids[PRIMARY_USER_SID_INDEX]);
 396                 if (ret != LDB_SUCCESS) {
 397                         DEBUG(0,(__location__ ": Refusing DsReplicaUpdateRefs for sid %s with GUID %s\n",
 398                                  dom_sid_string(mem_ctx,
 399                                                 &session_info->security_token->sids[PRIMARY_USER_SID_INDEX]),
 400                                  GUID_string(mem_ctx, &req->dest_dsa_guid)));
 401                         return WERR_DS_DRA_ACCESS_DENIED;
 402                 }
 403         }
 404
 405         werr = drsuapi_UpdateRefs(imsg_ctx,
 406                                   dce_call->event_ctx,
 407                                   b_state,
 408                                   mem_ctx,
 409                                   req);
 410
 411 #if 0
 412         NDR_PRINT_FUNCTION_DEBUG(drsuapi_DsReplicaUpdateRefs, NDR_BOTH, r);
 413 #endif
 414
 415         return werr;
 416 }