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