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