source3/rpc_server/rpc_ncacn_np.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC Pipe client / server routines
   4  *  Copyright (C) Andrew Tridgell              1992-1998,
   5  *  Largely re-written : 2005
   6  *  Copyright (C) Jeremy Allison                1998 - 2005
   7  *  Copyright (C) Simo Sorce                    2010
   8  *  Copyright (C) Andrew Bartlett               2011
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 3 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "includes.h"
  25 #include "rpc_client/cli_pipe.h"
  26 #include "rpc_server/srv_pipe_internal.h"
  27 #include "rpc_dce.h"
  28 #include "../libcli/named_pipe_auth/npa_tstream.h"
  29 #include "rpc_server/rpc_ncacn_np.h"
  30 #include "librpc/gen_ndr/netlogon.h"
  31 #include "librpc/gen_ndr/auth.h"
  32 #include "../auth/auth_sam_reply.h"
  33 #include "auth.h"
  34 #include "rpc_server/rpc_pipes.h"
  35 #include "../lib/tsocket/tsocket.h"
  36 #include "../lib/util/tevent_ntstatus.h"
  37 #include "rpc_contexts.h"
  38 #include "rpc_server/rpc_config.h"
  39 #include "librpc/ndr/ndr_table.h"
  40
  41 #undef DBGC_CLASS
  42 #define DBGC_CLASS DBGC_RPC_SRV
  43
  44 static struct npa_state *npa_state_init(TALLOC_CTX *mem_ctx)
  45 {
  46         struct npa_state *npa;
  47
  48         npa = talloc_zero(mem_ctx, struct npa_state);
  49         if (npa == NULL) {
  50                 return NULL;
  51         }
  52
  53         npa->read_queue = tevent_queue_create(npa, "npa_cli_read");
  54         if (npa->read_queue == NULL) {
  55                 DEBUG(0, ("tevent_queue_create failed\n"));
  56                 goto fail;
  57         }
  58
  59         npa->write_queue = tevent_queue_create(npa, "npa_cli_write");
  60         if (npa->write_queue == NULL) {
  61                 DEBUG(0, ("tevent_queue_create failed\n"));
  62                 goto fail;
  63         }
  64
  65         return npa;
  66 fail:
  67         talloc_free(npa);
  68         return NULL;
  69 }
  70
  71 /****************************************************************************
  72  Make an internal namedpipes structure
  73 ****************************************************************************/
  74
  75 struct pipes_struct *make_internal_rpc_pipe_p(TALLOC_CTX *mem_ctx,
  76                                               const struct ndr_syntax_id *syntax,
  77                                               const struct tsocket_address *remote_address,
  78                                               const struct auth_session_info *session_info,
  79                                               struct messaging_context *msg_ctx)
  80 {
  81         struct pipes_struct *p;
  82         struct pipe_rpc_fns *context_fns;
  83         const char *pipe_name;
  84         int ret;
  85         const struct ndr_interface_table *table;
  86
  87         table = ndr_table_by_uuid(&syntax->uuid);
  88         if (table == NULL) {
  89                 DEBUG(0,("unknown interface\n"));
  90                 return NULL;
  91         }
  92
  93         pipe_name = dcerpc_default_transport_endpoint(mem_ctx, NCACN_NP, table);
  94
  95         DEBUG(4,("Create pipe requested %s\n", pipe_name));
  96
  97         ret = make_base_pipes_struct(mem_ctx, msg_ctx, pipe_name,
  98                                      NCALRPC, RPC_LITTLE_ENDIAN, false,
  99                                      remote_address, NULL, &p);
 100         if (ret) {
 101                 DEBUG(0,("ERROR! no memory for pipes_struct!\n"));
 102                 return NULL;
 103         }
 104
 105         if (!init_pipe_handles(p, syntax)) {
 106                 DEBUG(0,("open_rpc_pipe_p: init_pipe_handles failed.\n"));
 107                 TALLOC_FREE(p);
 108                 return NULL;
 109         }
 110
 111         p->session_info = copy_session_info(p, session_info);
 112         if (p->session_info == NULL) {
 113                 DEBUG(0, ("open_rpc_pipe_p: copy_serverinfo failed\n"));
 114                 close_policy_by_pipe(p);
 115                 TALLOC_FREE(p);
 116                 return NULL;
 117         }
 118
 119         context_fns = talloc(p, struct pipe_rpc_fns);
 120         if (context_fns == NULL) {
 121                 DEBUG(0,("talloc() failed!\n"));
 122                 TALLOC_FREE(p);
 123                 return NULL;
 124         }
 125
 126         context_fns->next = context_fns->prev = NULL;
 127         context_fns->n_cmds = rpc_srv_get_pipe_num_cmds(syntax);
 128         context_fns->cmds = rpc_srv_get_pipe_cmds(syntax);
 129         context_fns->context_id = 0;
 130         context_fns->syntax = *syntax;
 131
 132         /* add to the list of open contexts */
 133         DLIST_ADD(p->contexts, context_fns);
 134
 135         DEBUG(4,("Created internal pipe %s\n", pipe_name));
 136
 137         return p;
 138 }
 139
 140 static NTSTATUS rpcint_dispatch(struct pipes_struct *p,
 141                                 TALLOC_CTX *mem_ctx,
 142                                 uint32_t opnum,
 143                                 const DATA_BLOB *in_data,
 144                                 DATA_BLOB *out_data)
 145 {
 146         struct pipe_rpc_fns *fns = find_pipe_fns_by_context(p->contexts, 0);
 147         uint32_t num_cmds = fns->n_cmds;
 148         const struct api_struct *cmds = fns->cmds;
 149         uint32_t i;
 150         bool ok;
 151
 152         /* set opnum */
 153         p->opnum = opnum;
 154
 155         for (i = 0; i < num_cmds; i++) {
 156                 if (cmds[i].opnum == opnum && cmds[i].fn != NULL) {
 157                         break;
 158                 }
 159         }
 160
 161         if (i == num_cmds) {
 162                 return NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE;
 163         }
 164
 165         p->in_data.data = *in_data;
 166         p->out_data.rdata = data_blob_null;
 167
 168         ok = cmds[i].fn(p);
 169         p->in_data.data = data_blob_null;
 170         if (!ok) {
 171                 data_blob_free(&p->out_data.rdata);
 172                 talloc_free_children(p->mem_ctx);
 173                 return NT_STATUS_RPC_CALL_FAILED;
 174         }
 175
 176         if (p->fault_state) {
 177                 NTSTATUS status;
 178
 179                 status = NT_STATUS(p->fault_state);
 180                 p->fault_state = 0;
 181                 data_blob_free(&p->out_data.rdata);
 182                 talloc_free_children(p->mem_ctx);
 183                 return status;
 184         }
 185
 186         *out_data = p->out_data.rdata;
 187         talloc_steal(mem_ctx, out_data->data);
 188         p->out_data.rdata = data_blob_null;
 189
 190         talloc_free_children(p->mem_ctx);
 191         return NT_STATUS_OK;
 192 }
 193
 194 struct rpcint_bh_state {
 195         struct pipes_struct *p;
 196 };
 197
 198 static bool rpcint_bh_is_connected(struct dcerpc_binding_handle *h)
 199 {
 200         struct rpcint_bh_state *hs = dcerpc_binding_handle_data(h,
 201                                      struct rpcint_bh_state);
 202
 203         if (!hs->p) {
 204                 return false;
 205         }
 206
 207         return true;
 208 }
 209
 210 static uint32_t rpcint_bh_set_timeout(struct dcerpc_binding_handle *h,
 211                                       uint32_t timeout)
 212 {
 213         /* TODO: implement timeouts */
 214         return UINT32_MAX;
 215 }
 216
 217 struct rpcint_bh_raw_call_state {
 218         DATA_BLOB in_data;
 219         DATA_BLOB out_data;
 220         uint32_t out_flags;
 221 };
 222
 223 static struct tevent_req *rpcint_bh_raw_call_send(TALLOC_CTX *mem_ctx,
 224                                                   struct tevent_context *ev,
 225                                                   struct dcerpc_binding_handle *h,
 226                                                   const struct GUID *object,
 227                                                   uint32_t opnum,
 228                                                   uint32_t in_flags,
 229                                                   const uint8_t *in_data,
 230                                                   size_t in_length)
 231 {
 232         struct rpcint_bh_state *hs =
 233                 dcerpc_binding_handle_data(h,
 234                 struct rpcint_bh_state);
 235         struct tevent_req *req;
 236         struct rpcint_bh_raw_call_state *state;
 237         bool ok;
 238         NTSTATUS status;
 239
 240         req = tevent_req_create(mem_ctx, &state,
 241                                 struct rpcint_bh_raw_call_state);
 242         if (req == NULL) {
 243                 return NULL;
 244         }
 245         state->in_data.data = discard_const_p(uint8_t, in_data);
 246         state->in_data.length = in_length;
 247
 248         ok = rpcint_bh_is_connected(h);
 249         if (!ok) {
 250                 tevent_req_nterror(req, NT_STATUS_CONNECTION_DISCONNECTED);
 251                 return tevent_req_post(req, ev);
 252         }
 253
 254         /* TODO: allow async */
 255         status = rpcint_dispatch(hs->p, state, opnum,
 256                                  &state->in_data,
 257                                  &state->out_data);
 258         if (!NT_STATUS_IS_OK(status)) {
 259                 tevent_req_nterror(req, status);
 260                 return tevent_req_post(req, ev);
 261         }
 262
 263         tevent_req_done(req);
 264         return tevent_req_post(req, ev);
 265 }
 266
 267 static NTSTATUS rpcint_bh_raw_call_recv(struct tevent_req *req,
 268                                         TALLOC_CTX *mem_ctx,
 269                                         uint8_t **out_data,
 270                                         size_t *out_length,
 271                                         uint32_t *out_flags)
 272 {
 273         struct rpcint_bh_raw_call_state *state =
 274                 tevent_req_data(req,
 275                 struct rpcint_bh_raw_call_state);
 276         NTSTATUS status;
 277
 278         if (tevent_req_is_nterror(req, &status)) {
 279                 tevent_req_received(req);
 280                 return status;
 281         }
 282
 283         *out_data = talloc_move(mem_ctx, &state->out_data.data);
 284         *out_length = state->out_data.length;
 285         *out_flags = 0;
 286         tevent_req_received(req);
 287         return NT_STATUS_OK;
 288 }
 289
 290 struct rpcint_bh_disconnect_state {
 291         uint8_t _dummy;
 292 };
 293
 294 static struct tevent_req *rpcint_bh_disconnect_send(TALLOC_CTX *mem_ctx,
 295                                                 struct tevent_context *ev,
 296                                                 struct dcerpc_binding_handle *h)
 297 {
 298         struct rpcint_bh_state *hs = dcerpc_binding_handle_data(h,
 299                                      struct rpcint_bh_state);
 300         struct tevent_req *req;
 301         struct rpcint_bh_disconnect_state *state;
 302         bool ok;
 303
 304         req = tevent_req_create(mem_ctx, &state,
 305                                 struct rpcint_bh_disconnect_state);
 306         if (req == NULL) {
 307                 return NULL;
 308         }
 309
 310         ok = rpcint_bh_is_connected(h);
 311         if (!ok) {
 312                 tevent_req_nterror(req, NT_STATUS_CONNECTION_DISCONNECTED);
 313                 return tevent_req_post(req, ev);
 314         }
 315
 316         /*
 317          * TODO: do a real async disconnect ...
 318          *
 319          * For now the caller needs to free pipes_struct
 320          */
 321         hs->p = NULL;
 322
 323         tevent_req_done(req);
 324         return tevent_req_post(req, ev);
 325 }
 326
 327 static NTSTATUS rpcint_bh_disconnect_recv(struct tevent_req *req)
 328 {
 329         NTSTATUS status;
 330
 331         if (tevent_req_is_nterror(req, &status)) {
 332                 tevent_req_received(req);
 333                 return status;
 334         }
 335
 336         tevent_req_received(req);
 337         return NT_STATUS_OK;
 338 }
 339
 340 static bool rpcint_bh_ref_alloc(struct dcerpc_binding_handle *h)
 341 {
 342         return true;
 343 }
 344
 345 static void rpcint_bh_do_ndr_print(struct dcerpc_binding_handle *h,
 346                                    int ndr_flags,
 347                                    const void *_struct_ptr,
 348                                    const struct ndr_interface_call *call)
 349 {
 350         void *struct_ptr = discard_const(_struct_ptr);
 351
 352         if (DEBUGLEVEL < 11) {
 353                 return;
 354         }
 355
 356         if (ndr_flags & NDR_IN) {
 357                 ndr_print_function_debug(call->ndr_print,
 358                                          call->name,
 359                                          ndr_flags,
 360                                          struct_ptr);
 361         }
 362         if (ndr_flags & NDR_OUT) {
 363                 ndr_print_function_debug(call->ndr_print,
 364                                          call->name,
 365                                          ndr_flags,
 366                                          struct_ptr);
 367         }
 368 }
 369
 370 static const struct dcerpc_binding_handle_ops rpcint_bh_ops = {
 371         .name                   = "rpcint",
 372         .is_connected           = rpcint_bh_is_connected,
 373         .set_timeout            = rpcint_bh_set_timeout,
 374         .raw_call_send          = rpcint_bh_raw_call_send,
 375         .raw_call_recv          = rpcint_bh_raw_call_recv,
 376         .disconnect_send        = rpcint_bh_disconnect_send,
 377         .disconnect_recv        = rpcint_bh_disconnect_recv,
 378
 379         .ref_alloc              = rpcint_bh_ref_alloc,
 380         .do_ndr_print           = rpcint_bh_do_ndr_print,
 381 };
 382
 383 static NTSTATUS rpcint_binding_handle_ex(TALLOC_CTX *mem_ctx,
 384                         const struct ndr_syntax_id *abstract_syntax,
 385                         const struct ndr_interface_table *ndr_table,
 386                         const struct tsocket_address *remote_address,
 387                         const struct auth_session_info *session_info,
 388                         struct messaging_context *msg_ctx,
 389                         struct dcerpc_binding_handle **binding_handle)
 390 {
 391         struct dcerpc_binding_handle *h;
 392         struct rpcint_bh_state *hs;
 393
 394         if (ndr_table) {
 395                 abstract_syntax = &ndr_table->syntax_id;
 396         }
 397
 398         h = dcerpc_binding_handle_create(mem_ctx,
 399                                          &rpcint_bh_ops,
 400                                          NULL,
 401                                          ndr_table,
 402                                          &hs,
 403                                          struct rpcint_bh_state,
 404                                          __location__);
 405         if (h == NULL) {
 406                 return NT_STATUS_NO_MEMORY;
 407         }
 408         hs->p = make_internal_rpc_pipe_p(hs,
 409                                          abstract_syntax,
 410                                          remote_address,
 411                                          session_info,
 412                                          msg_ctx);
 413         if (hs->p == NULL) {
 414                 TALLOC_FREE(h);
 415                 return NT_STATUS_NO_MEMORY;
 416         }
 417
 418         *binding_handle = h;
 419         return NT_STATUS_OK;
 420 }
 421 /**
 422  * @brief Create a new DCERPC Binding Handle which uses a local dispatch function.
 423  *
 424  * @param[in]  mem_ctx  The memory context to use.
 425  *
 426  * @param[in]  ndr_table Normally the ndr_table_<name>.
 427  *
 428  * @param[in]  remote_address The info about the connected client.
 429  *
 430  * @param[in]  serversupplied_info The server supplied authentication function.
 431  *
 432  * @param[in]  msg_ctx   The messaging context that can be used by the server
 433  *
 434  * @param[out] binding_handle  A pointer to store the connected
 435  *                             dcerpc_binding_handle
 436  *
 437  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 438  *                      error occured.
 439  *
 440  * @code
 441  *   struct dcerpc_binding_handle *winreg_binding;
 442  *   NTSTATUS status;
 443  *
 444  *   status = rpcint_binding_handle(tmp_ctx,
 445  *                                  &ndr_table_winreg,
 446  *                                  p->remote_address,
 447  *                                  p->session_info,
 448  *                                  p->msg_ctx
 449  *                                  &winreg_binding);
 450  * @endcode
 451  */
 452 NTSTATUS rpcint_binding_handle(TALLOC_CTX *mem_ctx,
 453                                const struct ndr_interface_table *ndr_table,
 454                                const struct tsocket_address *remote_address,
 455                                const struct auth_session_info *session_info,
 456                                struct messaging_context *msg_ctx,
 457                                struct dcerpc_binding_handle **binding_handle)
 458 {
 459         return rpcint_binding_handle_ex(mem_ctx, NULL, ndr_table, remote_address,
 460                                         session_info, msg_ctx, binding_handle);
 461 }
 462
 463 /**
 464  * @internal
 465  *
 466  * @brief Create a new RPC client context which uses a local transport.
 467  *
 468  * This creates a local transport. It is a shortcut to directly call the server
 469  * functions and avoid marshalling.
 470  * NOTE: this function should be used only by rpc_pipe_open_interface()
 471  *
 472  * @param[in]  mem_ctx  The memory context to use.
 473  *
 474  * @param[in]  abstract_syntax Normally the syntax_id of the autogenerated
 475  *                             ndr_table_<name>.
 476  *
 477  * @param[in]  serversupplied_info The server supplied authentication function.
 478  *
 479  * @param[in]  remote_address The client address information.
 480  *
 481  * @param[in]  msg_ctx  The messaging context to use.
 482  *
 483  * @param[out] presult  A pointer to store the connected rpc client pipe.
 484  *
 485  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 486  *                      error occured.
 487  */
 488 NTSTATUS rpc_pipe_open_internal(TALLOC_CTX *mem_ctx,
 489                                 const struct ndr_syntax_id *abstract_syntax,
 490                                 const struct auth_session_info *session_info,
 491                                 const struct tsocket_address *remote_address,
 492                                 struct messaging_context *msg_ctx,
 493                                 struct rpc_pipe_client **presult)
 494 {
 495         struct rpc_pipe_client *result;
 496         NTSTATUS status;
 497
 498         result = talloc_zero(mem_ctx, struct rpc_pipe_client);
 499         if (result == NULL) {
 500                 return NT_STATUS_NO_MEMORY;
 501         }
 502
 503         result->abstract_syntax = *abstract_syntax;
 504         result->transfer_syntax = ndr_transfer_syntax_ndr;
 505
 506         if (remote_address == NULL) {
 507                 struct tsocket_address *local;
 508                 int rc;
 509
 510                 rc = tsocket_address_inet_from_strings(mem_ctx,
 511                                                        "ip",
 512                                                        "127.0.0.1",
 513                                                        0,
 514                                                        &local);
 515                 if (rc < 0) {
 516                         TALLOC_FREE(result);
 517                         return NT_STATUS_NO_MEMORY;
 518                 }
 519
 520                 remote_address = local;
 521         }
 522
 523         result->max_xmit_frag = -1;
 524         result->max_recv_frag = -1;
 525
 526         status = rpcint_binding_handle_ex(result,
 527                                           abstract_syntax,
 528                                           NULL,
 529                                           remote_address,
 530                                           session_info,
 531                                           msg_ctx,
 532                                           &result->binding_handle);
 533         if (!NT_STATUS_IS_OK(status)) {
 534                 TALLOC_FREE(result);
 535                 return status;
 536         }
 537
 538         *presult = result;
 539         return NT_STATUS_OK;
 540 }
 541
 542 /****************************************************************************
 543  * External pipes functions
 544  ***************************************************************************/
 545
 546
 547 struct np_proxy_state *make_external_rpc_pipe_p(TALLOC_CTX *mem_ctx,
 548                                 const char *pipe_name,
 549                                 const struct tsocket_address *local_address,
 550                                 const struct tsocket_address *remote_address,
 551                                 const struct auth_session_info *session_info)
 552 {
 553         struct np_proxy_state *result;
 554         char *socket_np_dir;
 555         const char *socket_dir;
 556         struct tevent_context *ev;
 557         struct tevent_req *subreq;
 558         struct auth_session_info_transport *session_info_t;
 559         bool ok;
 560         int ret;
 561         int sys_errno;
 562
 563         result = talloc(mem_ctx, struct np_proxy_state);
 564         if (result == NULL) {
 565                 DEBUG(0, ("talloc failed\n"));
 566                 return NULL;
 567         }
 568
 569         result->read_queue = tevent_queue_create(result, "np_read");
 570         if (result->read_queue == NULL) {
 571                 DEBUG(0, ("tevent_queue_create failed\n"));
 572                 goto fail;
 573         }
 574
 575         result->write_queue = tevent_queue_create(result, "np_write");
 576         if (result->write_queue == NULL) {
 577                 DEBUG(0, ("tevent_queue_create failed\n"));
 578                 goto fail;
 579         }
 580
 581         ev = s3_tevent_context_init(talloc_tos());
 582         if (ev == NULL) {
 583                 DEBUG(0, ("s3_tevent_context_init failed\n"));
 584                 goto fail;
 585         }
 586
 587         socket_dir = lp_parm_const_string(
 588                 GLOBAL_SECTION_SNUM, "external_rpc_pipe", "socket_dir",
 589                 lp_ncalrpc_dir());
 590         if (socket_dir == NULL) {
 591                 DEBUG(0, ("external_rpc_pipe:socket_dir not set\n"));
 592                 goto fail;
 593         }
 594         socket_np_dir = talloc_asprintf(talloc_tos(), "%s/np", socket_dir);
 595         if (socket_np_dir == NULL) {
 596                 DEBUG(0, ("talloc_asprintf failed\n"));
 597                 goto fail;
 598         }
 599
 600         session_info_t = talloc_zero(talloc_tos(), struct auth_session_info_transport);
 601         if (session_info_t == NULL) {
 602                 DEBUG(0, ("talloc failed\n"));
 603                 goto fail;
 604         }
 605
 606         session_info_t->session_info = copy_session_info(session_info_t,
 607                                                          session_info);
 608         if (session_info_t->session_info == NULL) {
 609                 DEBUG(0, ("copy_session_info failed\n"));
 610                 goto fail;
 611         }
 612
 613         become_root();
 614         subreq = tstream_npa_connect_send(talloc_tos(), ev,
 615                                           socket_np_dir,
 616                                           pipe_name,
 617                                           remote_address, /* client_addr */
 618                                           NULL, /* client_name */
 619                                           local_address, /* server_addr */
 620                                           NULL, /* server_name */
 621                                           session_info_t);
 622         if (subreq == NULL) {
 623                 unbecome_root();
 624                 DEBUG(0, ("tstream_npa_connect_send to %s for pipe %s and "
 625                           "user %s\\%s failed\n",
 626                           socket_np_dir, pipe_name, session_info_t->session_info->info->domain_name,
 627                           session_info_t->session_info->info->account_name));
 628                 goto fail;
 629         }
 630         ok = tevent_req_poll(subreq, ev);
 631         unbecome_root();
 632         if (!ok) {
 633                 DEBUG(0, ("tevent_req_poll to %s for pipe %s and user %s\\%s "
 634                           "failed for tstream_npa_connect: %s\n",
 635                           socket_np_dir, pipe_name, session_info_t->session_info->info->domain_name,
 636                           session_info_t->session_info->info->account_name,
 637                           strerror(errno)));
 638                 goto fail;
 639
 640         }
 641         ret = tstream_npa_connect_recv(subreq, &sys_errno,
 642                                        result,
 643                                        &result->npipe,
 644                                        &result->file_type,
 645                                        &result->device_state,
 646                                        &result->allocation_size);
 647         TALLOC_FREE(subreq);
 648         if (ret != 0) {
 649                 int l = 1;
 650                 if (errno == ENOENT) {
 651                         l = 2;
 652                 }
 653                 DEBUG(l, ("tstream_npa_connect_recv  to %s for pipe %s and "
 654                           "user %s\\%s failed: %s\n",
 655                           socket_np_dir, pipe_name, session_info_t->session_info->info->domain_name,
 656                           session_info_t->session_info->info->account_name,
 657                           strerror(sys_errno)));
 658                 goto fail;
 659         }
 660
 661         return result;
 662
 663  fail:
 664         TALLOC_FREE(result);
 665         return NULL;
 666 }
 667
 668 static NTSTATUS rpc_pipe_open_external(TALLOC_CTX *mem_ctx,
 669                                 const char *pipe_name,
 670                                 const struct ndr_interface_table *table,
 671                                 const struct auth_session_info *session_info,
 672                                 struct rpc_pipe_client **_result)
 673 {
 674         struct tsocket_address *local, *remote;
 675         struct rpc_pipe_client *result = NULL;
 676         struct np_proxy_state *proxy_state = NULL;
 677         struct pipe_auth_data *auth;
 678         NTSTATUS status;
 679         int ret;
 680
 681         /* this is an internal connection, fake up ip addresses */
 682         ret = tsocket_address_inet_from_strings(talloc_tos(), "ip",
 683                                                 NULL, 0, &local);
 684         if (ret) {
 685                 return NT_STATUS_NO_MEMORY;
 686         }
 687         ret = tsocket_address_inet_from_strings(talloc_tos(), "ip",
 688                                                 NULL, 0, &remote);
 689         if (ret) {
 690                 return NT_STATUS_NO_MEMORY;
 691         }
 692
 693         proxy_state = make_external_rpc_pipe_p(mem_ctx, pipe_name,
 694                                                 local, remote, session_info);
 695         if (!proxy_state) {
 696                 return NT_STATUS_UNSUCCESSFUL;
 697         }
 698
 699         result = talloc_zero(mem_ctx, struct rpc_pipe_client);
 700         if (result == NULL) {
 701                 status = NT_STATUS_NO_MEMORY;
 702                 goto done;
 703         }
 704
 705         result->abstract_syntax = table->syntax_id;
 706         result->transfer_syntax = ndr_transfer_syntax_ndr;
 707
 708         result->desthost = get_myname(result);
 709         result->srv_name_slash = talloc_asprintf_strupper_m(
 710                 result, "\\\\%s", result->desthost);
 711         if ((result->desthost == NULL) || (result->srv_name_slash == NULL)) {
 712                 status = NT_STATUS_NO_MEMORY;
 713                 goto done;
 714         }
 715
 716         result->max_xmit_frag = RPC_MAX_PDU_FRAG_LEN;
 717         result->max_recv_frag = RPC_MAX_PDU_FRAG_LEN;
 718
 719         status = rpc_transport_tstream_init(result,
 720                                             &proxy_state->npipe,
 721                                             &result->transport);
 722         if (!NT_STATUS_IS_OK(status)) {
 723                 goto done;
 724         }
 725
 726         result->binding_handle = rpccli_bh_create(result, NULL, table);
 727         if (result->binding_handle == NULL) {
 728                 status = NT_STATUS_NO_MEMORY;
 729                 DEBUG(0, ("Failed to create binding handle.\n"));
 730                 goto done;
 731         }
 732
 733         result->auth = talloc_zero(result, struct pipe_auth_data);
 734         if (!result->auth) {
 735                 status = NT_STATUS_NO_MEMORY;
 736                 goto done;
 737         }
 738         result->auth->auth_type = DCERPC_AUTH_TYPE_NONE;
 739         result->auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
 740
 741         status = rpccli_anon_bind_data(result, &auth);
 742         if (!NT_STATUS_IS_OK(status)) {
 743                 DEBUG(0, ("Failed to initialize anonymous bind.\n"));
 744                 goto done;
 745         }
 746
 747         status = rpc_pipe_bind(result, auth);
 748         if (!NT_STATUS_IS_OK(status)) {
 749                 DEBUG(0, ("Failed to bind external pipe.\n"));
 750                 goto done;
 751         }
 752
 753 done:
 754         if (!NT_STATUS_IS_OK(status)) {
 755                 TALLOC_FREE(result);
 756         }
 757         TALLOC_FREE(proxy_state);
 758         *_result = result;
 759         return status;
 760 }
 761
 762 /**
 763  * @brief Create a new RPC client context which uses a local dispatch function
 764  *        or a remote transport, depending on rpc_server configuration for the
 765  *        specific service.
 766  *
 767  * @param[in]  mem_ctx  The memory context to use.
 768  *
 769  * @param[in]  abstract_syntax Normally the syntax_id of the autogenerated
 770  *                             ndr_table_<name>.
 771  *
 772  * @param[in]  serversupplied_info The server supplied authentication function.
 773  *
 774  * @param[in]  remote_address The client address information.
 775  *
 776  * @param[in]  msg_ctx  The messaging context to use.
 777  *
 778  * @param[out] presult  A pointer to store the connected rpc client pipe.
 779  *
 780  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 781  *                      error occured.
 782  *
 783  * @code
 784  *   struct rpc_pipe_client *winreg_pipe;
 785  *   NTSTATUS status;
 786  *
 787  *   status = rpc_pipe_open_interface(tmp_ctx,
 788  *                                    &ndr_table_winreg.syntax_id,
 789  *                                    p->session_info,
 790  *                                    remote_address,
 791  *                                    &winreg_pipe);
 792  * @endcode
 793  */
 794
 795 NTSTATUS rpc_pipe_open_interface(TALLOC_CTX *mem_ctx,
 796                                  const struct ndr_interface_table *table,
 797                                  const struct auth_session_info *session_info,
 798                                  const struct tsocket_address *remote_address,
 799                                  struct messaging_context *msg_ctx,
 800                                  struct rpc_pipe_client **cli_pipe)
 801 {
 802         struct rpc_pipe_client *cli = NULL;
 803         enum rpc_service_mode_e pipe_mode;
 804         const char *pipe_name;
 805         NTSTATUS status;
 806         TALLOC_CTX *tmp_ctx;
 807
 808         if (cli_pipe != NULL) {
 809                 if (rpccli_is_connected(*cli_pipe)) {
 810                         return NT_STATUS_OK;
 811                 } else {
 812                         TALLOC_FREE(*cli_pipe);
 813                 }
 814         }
 815
 816         tmp_ctx = talloc_stackframe();
 817         if (tmp_ctx == NULL) {
 818                 return NT_STATUS_NO_MEMORY;
 819         }
 820
 821         pipe_name = dcerpc_default_transport_endpoint(mem_ctx, NCACN_NP, table);
 822         if (pipe_name == NULL) {
 823                 status = NT_STATUS_INVALID_PARAMETER;
 824                 goto done;
 825         }
 826
 827         while (pipe_name[0] == '\\') {
 828                 pipe_name++;
 829         }
 830
 831         DEBUG(5, ("Connecting to %s pipe.\n", pipe_name));
 832
 833         pipe_mode = rpc_service_mode(pipe_name);
 834
 835         switch (pipe_mode) {
 836         case RPC_SERVICE_MODE_EMBEDDED:
 837                 status = rpc_pipe_open_internal(tmp_ctx,
 838                                                 &table->syntax_id, session_info,
 839                                                 remote_address, msg_ctx,
 840                                                 &cli);
 841                 if (!NT_STATUS_IS_OK(status)) {
 842                         goto done;
 843                 }
 844                 break;
 845         case RPC_SERVICE_MODE_EXTERNAL:
 846                 /* It would be nice to just use rpc_pipe_open_ncalrpc() but
 847                  * for now we need to use the special proxy setup to connect
 848                  * to spoolssd. */
 849
 850                 status = rpc_pipe_open_external(tmp_ctx,
 851                                                 pipe_name, table,
 852                                                 session_info,
 853                                                 &cli);
 854                 if (!NT_STATUS_IS_OK(status)) {
 855                         goto done;
 856                 }
 857                 break;
 858         case RPC_SERVICE_MODE_DISABLED:
 859                 status = NT_STATUS_NOT_IMPLEMENTED;
 860                 DEBUG(0, ("Service pipe %s is disabled in config file: %s",
 861                           pipe_name, nt_errstr(status)));
 862                 goto done;
 863         }
 864
 865         status = NT_STATUS_OK;
 866 done:
 867         if (NT_STATUS_IS_OK(status) && cli_pipe != NULL) {
 868                 *cli_pipe = talloc_move(mem_ctx, &cli);
 869         }
 870         TALLOC_FREE(tmp_ctx);
 871         return status;
 872 }