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  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 3 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "includes.h"
  24 #include "rpc_client/cli_pipe.h"
  25 #include "rpc_server/srv_pipe_internal.h"
  26 #include "rpc_dce.h"
  27 #include "../libcli/named_pipe_auth/npa_tstream.h"
  28 #include "rpc_server/rpc_ncacn_np.h"
  29 #include "librpc/gen_ndr/netlogon.h"
  30 #include "librpc/gen_ndr/auth.h"
  31 #include "../auth/auth_sam_reply.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_RPC_SRV
  35
  36 static int pipes_open;
  37
  38 static struct pipes_struct *InternalPipes;
  39
  40 /* TODO
  41  * the following prototypes are declared here to avoid
  42  * code being moved about too much for a patch to be
  43  * disrupted / less obvious.
  44  *
  45  * these functions, and associated functions that they
  46  * call, should be moved behind a .so module-loading
  47  * system _anyway_.  so that's the next step...
  48  */
  49
  50 /****************************************************************************
  51  Internal Pipe iterator functions.
  52 ****************************************************************************/
  53
  54 struct pipes_struct *get_first_internal_pipe(void)
  55 {
  56         return InternalPipes;
  57 }
  58
  59 struct pipes_struct *get_next_internal_pipe(struct pipes_struct *p)
  60 {
  61         return p->next;
  62 }
  63
  64 static void free_pipe_rpc_context_internal( PIPE_RPC_FNS *list )
  65 {
  66         PIPE_RPC_FNS *tmp = list;
  67         PIPE_RPC_FNS *tmp2;
  68
  69         while (tmp) {
  70                 tmp2 = tmp->next;
  71                 SAFE_FREE(tmp);
  72                 tmp = tmp2;
  73         }
  74
  75         return;
  76 }
  77
  78 bool check_open_pipes(void)
  79 {
  80         struct pipes_struct *p;
  81
  82         for (p = InternalPipes; p != NULL; p = p->next) {
  83                 if (num_pipe_handles(p) != 0) {
  84                         return true;
  85                 }
  86         }
  87         return false;
  88 }
  89
  90 /****************************************************************************
  91  Close an rpc pipe.
  92 ****************************************************************************/
  93
  94 int close_internal_rpc_pipe_hnd(struct pipes_struct *p)
  95 {
  96         if (!p) {
  97                 DEBUG(0,("Invalid pipe in close_internal_rpc_pipe_hnd\n"));
  98                 return False;
  99         }
 100
 101         TALLOC_FREE(p->auth.auth_ctx);
 102
 103         free_pipe_rpc_context_internal( p->contexts );
 104
 105         /* Free the handles database. */
 106         close_policy_by_pipe(p);
 107
 108         DLIST_REMOVE(InternalPipes, p);
 109
 110         ZERO_STRUCTP(p);
 111
 112         return 0;
 113 }
 114
 115 /****************************************************************************
 116  Make an internal namedpipes structure
 117 ****************************************************************************/
 118
 119 struct pipes_struct *make_internal_rpc_pipe_p(TALLOC_CTX *mem_ctx,
 120                                               const struct ndr_syntax_id *syntax,
 121                                               struct client_address *client_id,
 122                                               const struct auth_serversupplied_info *session_info,
 123                                               struct messaging_context *msg_ctx)
 124 {
 125         struct pipes_struct *p;
 126
 127         DEBUG(4,("Create pipe requested %s\n",
 128                  get_pipe_name_from_syntax(talloc_tos(), syntax)));
 129
 130         p = TALLOC_ZERO_P(mem_ctx, struct pipes_struct);
 131
 132         if (!p) {
 133                 DEBUG(0,("ERROR! no memory for pipes_struct!\n"));
 134                 return NULL;
 135         }
 136
 137         p->mem_ctx = talloc_named(p, 0, "pipe %s %p",
 138                                  get_pipe_name_from_syntax(talloc_tos(),
 139                                                            syntax), p);
 140         if (p->mem_ctx == NULL) {
 141                 DEBUG(0,("open_rpc_pipe_p: talloc_init failed.\n"));
 142                 TALLOC_FREE(p);
 143                 return NULL;
 144         }
 145
 146         if (!init_pipe_handles(p, syntax)) {
 147                 DEBUG(0,("open_rpc_pipe_p: init_pipe_handles failed.\n"));
 148                 TALLOC_FREE(p);
 149                 return NULL;
 150         }
 151
 152         p->session_info = copy_serverinfo(p, session_info);
 153         if (p->session_info == NULL) {
 154                 DEBUG(0, ("open_rpc_pipe_p: copy_serverinfo failed\n"));
 155                 close_policy_by_pipe(p);
 156                 TALLOC_FREE(p);
 157                 return NULL;
 158         }
 159
 160         p->msg_ctx = msg_ctx;
 161
 162         DLIST_ADD(InternalPipes, p);
 163
 164         p->client_id = client_id;
 165
 166         p->endian = RPC_LITTLE_ENDIAN;
 167
 168         p->syntax = *syntax;
 169         p->transport = NCALRPC;
 170
 171         DEBUG(4,("Created internal pipe %s (pipes_open=%d)\n",
 172                  get_pipe_name_from_syntax(talloc_tos(), syntax), pipes_open));
 173
 174         talloc_set_destructor(p, close_internal_rpc_pipe_hnd);
 175
 176         return p;
 177 }
 178
 179 static NTSTATUS rpcint_dispatch(struct pipes_struct *p,
 180                                 TALLOC_CTX *mem_ctx,
 181                                 uint32_t opnum,
 182                                 const DATA_BLOB *in_data,
 183                                 DATA_BLOB *out_data)
 184 {
 185         uint32_t num_cmds = rpc_srv_get_pipe_num_cmds(&p->syntax);
 186         const struct api_struct *cmds = rpc_srv_get_pipe_cmds(&p->syntax);
 187         uint32_t i;
 188         bool ok;
 189
 190         /* set opnum */
 191         p->opnum = opnum;
 192
 193         for (i = 0; i < num_cmds; i++) {
 194                 if (cmds[i].opnum == opnum && cmds[i].fn != NULL) {
 195                         break;
 196                 }
 197         }
 198
 199         if (i == num_cmds) {
 200                 return NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE;
 201         }
 202
 203         p->in_data.data = *in_data;
 204         p->out_data.rdata = data_blob_null;
 205
 206         ok = cmds[i].fn(p);
 207         p->in_data.data = data_blob_null;
 208         if (!ok) {
 209                 data_blob_free(&p->out_data.rdata);
 210                 talloc_free_children(p->mem_ctx);
 211                 return NT_STATUS_RPC_CALL_FAILED;
 212         }
 213
 214         if (p->fault_state) {
 215                 p->fault_state = false;
 216                 data_blob_free(&p->out_data.rdata);
 217                 talloc_free_children(p->mem_ctx);
 218                 return NT_STATUS_RPC_CALL_FAILED;
 219         }
 220
 221         if (p->bad_handle_fault_state) {
 222                 p->bad_handle_fault_state = false;
 223                 data_blob_free(&p->out_data.rdata);
 224                 talloc_free_children(p->mem_ctx);
 225                 return NT_STATUS_RPC_SS_CONTEXT_MISMATCH;
 226         }
 227
 228         if (p->rng_fault_state) {
 229                 p->rng_fault_state = false;
 230                 data_blob_free(&p->out_data.rdata);
 231                 talloc_free_children(p->mem_ctx);
 232                 return NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE;
 233         }
 234
 235         *out_data = p->out_data.rdata;
 236         talloc_steal(mem_ctx, out_data->data);
 237         p->out_data.rdata = data_blob_null;
 238
 239         talloc_free_children(p->mem_ctx);
 240         return NT_STATUS_OK;
 241 }
 242
 243 struct rpcint_bh_state {
 244         struct pipes_struct *p;
 245 };
 246
 247 static bool rpcint_bh_is_connected(struct dcerpc_binding_handle *h)
 248 {
 249         struct rpcint_bh_state *hs = dcerpc_binding_handle_data(h,
 250                                      struct rpcint_bh_state);
 251
 252         if (!hs->p) {
 253                 return false;
 254         }
 255
 256         return true;
 257 }
 258
 259 static uint32_t rpcint_bh_set_timeout(struct dcerpc_binding_handle *h,
 260                                       uint32_t timeout)
 261 {
 262         /* TODO: implement timeouts */
 263         return UINT32_MAX;
 264 }
 265
 266 struct rpcint_bh_raw_call_state {
 267         DATA_BLOB in_data;
 268         DATA_BLOB out_data;
 269         uint32_t out_flags;
 270 };
 271
 272 static struct tevent_req *rpcint_bh_raw_call_send(TALLOC_CTX *mem_ctx,
 273                                                   struct tevent_context *ev,
 274                                                   struct dcerpc_binding_handle *h,
 275                                                   const struct GUID *object,
 276                                                   uint32_t opnum,
 277                                                   uint32_t in_flags,
 278                                                   const uint8_t *in_data,
 279                                                   size_t in_length)
 280 {
 281         struct rpcint_bh_state *hs =
 282                 dcerpc_binding_handle_data(h,
 283                 struct rpcint_bh_state);
 284         struct tevent_req *req;
 285         struct rpcint_bh_raw_call_state *state;
 286         bool ok;
 287         NTSTATUS status;
 288
 289         req = tevent_req_create(mem_ctx, &state,
 290                                 struct rpcint_bh_raw_call_state);
 291         if (req == NULL) {
 292                 return NULL;
 293         }
 294         state->in_data.data = discard_const_p(uint8_t, in_data);
 295         state->in_data.length = in_length;
 296
 297         ok = rpcint_bh_is_connected(h);
 298         if (!ok) {
 299                 tevent_req_nterror(req, NT_STATUS_INVALID_CONNECTION);
 300                 return tevent_req_post(req, ev);
 301         }
 302
 303         /* TODO: allow async */
 304         status = rpcint_dispatch(hs->p, state, opnum,
 305                                  &state->in_data,
 306                                  &state->out_data);
 307         if (!NT_STATUS_IS_OK(status)) {
 308                 tevent_req_nterror(req, status);
 309                 return tevent_req_post(req, ev);
 310         }
 311
 312         tevent_req_done(req);
 313         return tevent_req_post(req, ev);
 314 }
 315
 316 static NTSTATUS rpcint_bh_raw_call_recv(struct tevent_req *req,
 317                                         TALLOC_CTX *mem_ctx,
 318                                         uint8_t **out_data,
 319                                         size_t *out_length,
 320                                         uint32_t *out_flags)
 321 {
 322         struct rpcint_bh_raw_call_state *state =
 323                 tevent_req_data(req,
 324                 struct rpcint_bh_raw_call_state);
 325         NTSTATUS status;
 326
 327         if (tevent_req_is_nterror(req, &status)) {
 328                 tevent_req_received(req);
 329                 return status;
 330         }
 331
 332         *out_data = talloc_move(mem_ctx, &state->out_data.data);
 333         *out_length = state->out_data.length;
 334         *out_flags = 0;
 335         tevent_req_received(req);
 336         return NT_STATUS_OK;
 337 }
 338
 339 struct rpcint_bh_disconnect_state {
 340         uint8_t _dummy;
 341 };
 342
 343 static struct tevent_req *rpcint_bh_disconnect_send(TALLOC_CTX *mem_ctx,
 344                                                 struct tevent_context *ev,
 345                                                 struct dcerpc_binding_handle *h)
 346 {
 347         struct rpcint_bh_state *hs = dcerpc_binding_handle_data(h,
 348                                      struct rpcint_bh_state);
 349         struct tevent_req *req;
 350         struct rpcint_bh_disconnect_state *state;
 351         bool ok;
 352
 353         req = tevent_req_create(mem_ctx, &state,
 354                                 struct rpcint_bh_disconnect_state);
 355         if (req == NULL) {
 356                 return NULL;
 357         }
 358
 359         ok = rpcint_bh_is_connected(h);
 360         if (!ok) {
 361                 tevent_req_nterror(req, NT_STATUS_INVALID_CONNECTION);
 362                 return tevent_req_post(req, ev);
 363         }
 364
 365         /*
 366          * TODO: do a real async disconnect ...
 367          *
 368          * For now the caller needs to free pipes_struct
 369          */
 370         hs->p = NULL;
 371
 372         tevent_req_done(req);
 373         return tevent_req_post(req, ev);
 374 }
 375
 376 static NTSTATUS rpcint_bh_disconnect_recv(struct tevent_req *req)
 377 {
 378         NTSTATUS status;
 379
 380         if (tevent_req_is_nterror(req, &status)) {
 381                 tevent_req_received(req);
 382                 return status;
 383         }
 384
 385         tevent_req_received(req);
 386         return NT_STATUS_OK;
 387 }
 388
 389 static bool rpcint_bh_ref_alloc(struct dcerpc_binding_handle *h)
 390 {
 391         return true;
 392 }
 393
 394 static void rpcint_bh_do_ndr_print(struct dcerpc_binding_handle *h,
 395                                    int ndr_flags,
 396                                    const void *_struct_ptr,
 397                                    const struct ndr_interface_call *call)
 398 {
 399         void *struct_ptr = discard_const(_struct_ptr);
 400
 401         if (DEBUGLEVEL < 11) {
 402                 return;
 403         }
 404
 405         if (ndr_flags & NDR_IN) {
 406                 ndr_print_function_debug(call->ndr_print,
 407                                          call->name,
 408                                          ndr_flags,
 409                                          struct_ptr);
 410         }
 411         if (ndr_flags & NDR_OUT) {
 412                 ndr_print_function_debug(call->ndr_print,
 413                                          call->name,
 414                                          ndr_flags,
 415                                          struct_ptr);
 416         }
 417 }
 418
 419 static const struct dcerpc_binding_handle_ops rpcint_bh_ops = {
 420         .name                   = "rpcint",
 421         .is_connected           = rpcint_bh_is_connected,
 422         .set_timeout            = rpcint_bh_set_timeout,
 423         .raw_call_send          = rpcint_bh_raw_call_send,
 424         .raw_call_recv          = rpcint_bh_raw_call_recv,
 425         .disconnect_send        = rpcint_bh_disconnect_send,
 426         .disconnect_recv        = rpcint_bh_disconnect_recv,
 427
 428         .ref_alloc              = rpcint_bh_ref_alloc,
 429         .do_ndr_print           = rpcint_bh_do_ndr_print,
 430 };
 431
 432 static NTSTATUS rpcint_binding_handle_ex(TALLOC_CTX *mem_ctx,
 433                         const struct ndr_syntax_id *abstract_syntax,
 434                         const struct ndr_interface_table *ndr_table,
 435                         struct client_address *client_id,
 436                         const struct auth_serversupplied_info *session_info,
 437                         struct messaging_context *msg_ctx,
 438                         struct dcerpc_binding_handle **binding_handle)
 439 {
 440         struct dcerpc_binding_handle *h;
 441         struct rpcint_bh_state *hs;
 442
 443         if (ndr_table) {
 444                 abstract_syntax = &ndr_table->syntax_id;
 445         }
 446
 447         h = dcerpc_binding_handle_create(mem_ctx,
 448                                          &rpcint_bh_ops,
 449                                          NULL,
 450                                          ndr_table,
 451                                          &hs,
 452                                          struct rpcint_bh_state,
 453                                          __location__);
 454         if (h == NULL) {
 455                 return NT_STATUS_NO_MEMORY;
 456         }
 457         hs->p = make_internal_rpc_pipe_p(hs,
 458                                          abstract_syntax,
 459                                          client_id,
 460                                          session_info,
 461                                          msg_ctx);
 462         if (hs->p == NULL) {
 463                 TALLOC_FREE(h);
 464                 return NT_STATUS_NO_MEMORY;
 465         }
 466
 467         *binding_handle = h;
 468         return NT_STATUS_OK;
 469 }
 470 /**
 471  * @brief Create a new DCERPC Binding Handle which uses a local dispatch function.
 472  *
 473  * @param[in]  mem_ctx  The memory context to use.
 474  *
 475  * @param[in]  ndr_table Normally the ndr_table_<name>.
 476  *
 477  * @param[in]  client_id The info about the connected client.
 478  *
 479  * @param[in]  serversupplied_info The server supplied authentication function.
 480  *
 481  * @param[in]  msg_ctx   The messaging context that can be used by the server
 482  *
 483  * @param[out] binding_handle  A pointer to store the connected
 484  *                             dcerpc_binding_handle
 485  *
 486  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 487  *                      error occured.
 488  *
 489  * @code
 490  *   struct dcerpc_binding_handle *winreg_binding;
 491  *   NTSTATUS status;
 492  *
 493  *   status = rpcint_binding_handle(tmp_ctx,
 494  *                                  &ndr_table_winreg,
 495  *                                  p->client_id,
 496  *                                  p->session_info,
 497  *                                  p->msg_ctx
 498  *                                  &winreg_binding);
 499  * @endcode
 500  */
 501 NTSTATUS rpcint_binding_handle(TALLOC_CTX *mem_ctx,
 502                                const struct ndr_interface_table *ndr_table,
 503                                struct client_address *client_id,
 504                                const struct auth_serversupplied_info *session_info,
 505                                struct messaging_context *msg_ctx,
 506                                struct dcerpc_binding_handle **binding_handle)
 507 {
 508         return rpcint_binding_handle_ex(mem_ctx, NULL, ndr_table, client_id,
 509                                         session_info, msg_ctx, binding_handle);
 510 }
 511
 512 /**
 513  * @internal
 514  *
 515  * @brief Create a new RPC client context which uses a local transport.
 516  *
 517  * This creates a local transport. It is a shortcut to directly call the server
 518  * functions and avoid marschalling.
 519  *
 520  * @param[in]  mem_ctx  The memory context to use.
 521  *
 522  * @param[in]  abstract_syntax Normally the syntax_id of the autogenerated
 523  *                             ndr_table_<name>.
 524  *
 525  * @param[in]  serversupplied_info The server supplied authentication function.
 526  *
 527  * @param[in]  client_id The client address information.
 528  *
 529  * @param[in]  msg_ctx  The messaging context to use.
 530  *
 531  * @param[out] presult  A pointer to store the connected rpc client pipe.
 532  *
 533  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 534  *                      error occured.
 535  *
 536  * @code
 537  *   struct rpc_pipe_client *winreg_pipe;
 538  *   NTSTATUS status;
 539  *
 540  *   status = rpc_pipe_open_internal(tmp_ctx,
 541  *                                   &ndr_table_winreg.syntax_id,
 542  *                                   p->session_info,
 543  *                                   client_id,
 544  *                                   &winreg_pipe);
 545  * @endcode
 546  */
 547 NTSTATUS rpc_pipe_open_internal(TALLOC_CTX *mem_ctx,
 548                                 const struct ndr_syntax_id *abstract_syntax,
 549                                 const struct auth_serversupplied_info *serversupplied_info,
 550                                 struct client_address *client_id,
 551                                 struct messaging_context *msg_ctx,
 552                                 struct rpc_pipe_client **presult)
 553 {
 554         struct rpc_pipe_client *result;
 555         NTSTATUS status;
 556
 557         result = TALLOC_ZERO_P(mem_ctx, struct rpc_pipe_client);
 558         if (result == NULL) {
 559                 return NT_STATUS_NO_MEMORY;
 560         }
 561
 562         result->abstract_syntax = *abstract_syntax;
 563         result->transfer_syntax = ndr_transfer_syntax;
 564
 565         if (client_id == NULL) {
 566                 static struct client_address unknown;
 567                 strlcpy(unknown.addr, "<UNKNOWN>", sizeof(unknown.addr));
 568                 unknown.name = "<UNKNOWN>";
 569                 client_id = &unknown;
 570         }
 571
 572         result->max_xmit_frag = -1;
 573         result->max_recv_frag = -1;
 574
 575         status = rpcint_binding_handle_ex(result,
 576                                           abstract_syntax,
 577                                           NULL,
 578                                           client_id,
 579                                           serversupplied_info,
 580                                           msg_ctx,
 581                                           &result->binding_handle);
 582         if (!NT_STATUS_IS_OK(status)) {
 583                 TALLOC_FREE(result);
 584                 return status;
 585         }
 586
 587         *presult = result;
 588         return NT_STATUS_OK;
 589 }
 590
 591 /****************************************************************************
 592  * External pipes functions
 593  ***************************************************************************/
 594
 595
 596 struct np_proxy_state *make_external_rpc_pipe_p(TALLOC_CTX *mem_ctx,
 597                                 const char *pipe_name,
 598                                 const struct tsocket_address *local_address,
 599                                 const struct tsocket_address *remote_address,
 600                                 const struct auth_serversupplied_info *session_info)
 601 {
 602         struct np_proxy_state *result;
 603         char *socket_np_dir;
 604         const char *socket_dir;
 605         struct tevent_context *ev;
 606         struct tevent_req *subreq;
 607         struct auth_session_info_transport *session_info_t;
 608         struct auth_user_info_dc *user_info_dc;
 609         union netr_Validation val;
 610         NTSTATUS status;
 611         bool ok;
 612         int ret;
 613         int sys_errno;
 614
 615         result = talloc(mem_ctx, struct np_proxy_state);
 616         if (result == NULL) {
 617                 DEBUG(0, ("talloc failed\n"));
 618                 return NULL;
 619         }
 620
 621         result->read_queue = tevent_queue_create(result, "np_read");
 622         if (result->read_queue == NULL) {
 623                 DEBUG(0, ("tevent_queue_create failed\n"));
 624                 goto fail;
 625         }
 626
 627         result->write_queue = tevent_queue_create(result, "np_write");
 628         if (result->write_queue == NULL) {
 629                 DEBUG(0, ("tevent_queue_create failed\n"));
 630                 goto fail;
 631         }
 632
 633         ev = s3_tevent_context_init(talloc_tos());
 634         if (ev == NULL) {
 635                 DEBUG(0, ("s3_tevent_context_init failed\n"));
 636                 goto fail;
 637         }
 638
 639         socket_dir = lp_parm_const_string(
 640                 GLOBAL_SECTION_SNUM, "external_rpc_pipe", "socket_dir",
 641                 lp_ncalrpc_dir());
 642         if (socket_dir == NULL) {
 643                 DEBUG(0, ("externan_rpc_pipe:socket_dir not set\n"));
 644                 goto fail;
 645         }
 646         socket_np_dir = talloc_asprintf(talloc_tos(), "%s/np", socket_dir);
 647         if (socket_np_dir == NULL) {
 648                 DEBUG(0, ("talloc_asprintf failed\n"));
 649                 goto fail;
 650         }
 651
 652         session_info_t = talloc_zero(talloc_tos(), struct auth_session_info_transport);
 653         if (session_info_t == NULL) {
 654                 DEBUG(0, ("talloc failed\n"));
 655                 goto fail;
 656         }
 657
 658         /* Send the named_pipe_auth server the user's full token */
 659         session_info_t->security_token = session_info->security_token;
 660         session_info_t->session_key = session_info->user_session_key;
 661
 662         val.sam3 = session_info->info3;
 663
 664         /* Convert into something we can build a struct
 665          * auth_session_info_transport from.  Most of the work here
 666          * will be to convert the SIDS, which we will then ignore, but
 667          * this is the easier way to handle it */
 668         status = make_user_info_dc_netlogon_validation(talloc_tos(), "", 3, &val, &user_info_dc);
 669         if (!NT_STATUS_IS_OK(status)) {
 670                 DEBUG(0, ("conversion of info3 into user_info_dc failed!\n"));
 671                 goto fail;
 672         }
 673
 674         session_info_t->info = talloc_move(session_info_t, &user_info_dc->info);
 675         talloc_free(user_info_dc);
 676
 677         become_root();
 678         subreq = tstream_npa_connect_send(talloc_tos(), ev,
 679                                           socket_np_dir,
 680                                           pipe_name,
 681                                           remote_address, /* client_addr */
 682                                           NULL, /* client_name */
 683                                           local_address, /* server_addr */
 684                                           NULL, /* server_name */
 685                                           session_info_t);
 686         if (subreq == NULL) {
 687                 unbecome_root();
 688                 DEBUG(0, ("tstream_npa_connect_send to %s for pipe %s and "
 689                           "user %s\\%s failed\n",
 690                           socket_np_dir, pipe_name, session_info_t->info->domain_name,
 691                           session_info_t->info->account_name));
 692                 goto fail;
 693         }
 694         ok = tevent_req_poll(subreq, ev);
 695         unbecome_root();
 696         if (!ok) {
 697                 DEBUG(0, ("tevent_req_poll to %s for pipe %s and user %s\\%s "
 698                           "failed for tstream_npa_connect: %s\n",
 699                           socket_np_dir, pipe_name, session_info_t->info->domain_name,
 700                           session_info_t->info->account_name,
 701                           strerror(errno)));
 702                 goto fail;
 703
 704         }
 705         ret = tstream_npa_connect_recv(subreq, &sys_errno,
 706                                        result,
 707                                        &result->npipe,
 708                                        &result->file_type,
 709                                        &result->device_state,
 710                                        &result->allocation_size);
 711         TALLOC_FREE(subreq);
 712         if (ret != 0) {
 713                 DEBUG(0, ("tstream_npa_connect_recv  to %s for pipe %s and "
 714                           "user %s\\%s failed: %s\n",
 715                           socket_np_dir, pipe_name, session_info_t->info->domain_name,
 716                           session_info_t->info->account_name,
 717                           strerror(sys_errno)));
 718                 goto fail;
 719         }
 720
 721         return result;
 722
 723  fail:
 724         TALLOC_FREE(result);
 725         return NULL;
 726 }
 727
 728 static NTSTATUS rpc_pipe_open_external(TALLOC_CTX *mem_ctx,
 729                                 const char *pipe_name,
 730                                 const struct ndr_syntax_id *abstract_syntax,
 731                                 const struct auth_serversupplied_info *session_info,
 732                                 struct rpc_pipe_client **_result)
 733 {
 734         struct tsocket_address *local, *remote;
 735         struct rpc_pipe_client *result = NULL;
 736         struct np_proxy_state *proxy_state = NULL;
 737         struct pipe_auth_data *auth;
 738         NTSTATUS status;
 739         int ret;
 740
 741         /* this is an internal connection, fake up ip addresses */
 742         ret = tsocket_address_inet_from_strings(talloc_tos(), "ip",
 743                                                 NULL, 0, &local);
 744         if (ret) {
 745                 return NT_STATUS_NO_MEMORY;
 746         }
 747         ret = tsocket_address_inet_from_strings(talloc_tos(), "ip",
 748                                                 NULL, 0, &remote);
 749         if (ret) {
 750                 return NT_STATUS_NO_MEMORY;
 751         }
 752
 753         proxy_state = make_external_rpc_pipe_p(mem_ctx, pipe_name,
 754                                                 local, remote, session_info);
 755         if (!proxy_state) {
 756                 return NT_STATUS_UNSUCCESSFUL;
 757         }
 758
 759         result = talloc_zero(mem_ctx, struct rpc_pipe_client);
 760         if (result == NULL) {
 761                 status = NT_STATUS_NO_MEMORY;
 762                 goto done;
 763         }
 764
 765         result->abstract_syntax = *abstract_syntax;
 766         result->transfer_syntax = ndr_transfer_syntax;
 767
 768         result->desthost = get_myname(result);
 769         result->srv_name_slash = talloc_asprintf_strupper_m(
 770                 result, "\\\\%s", result->desthost);
 771         if ((result->desthost == NULL) || (result->srv_name_slash == NULL)) {
 772                 status = NT_STATUS_NO_MEMORY;
 773                 goto done;
 774         }
 775
 776         result->max_xmit_frag = RPC_MAX_PDU_FRAG_LEN;
 777         result->max_recv_frag = RPC_MAX_PDU_FRAG_LEN;
 778
 779         status = rpc_transport_tstream_init(result,
 780                                             &proxy_state->npipe,
 781                                             &result->transport);
 782         if (!NT_STATUS_IS_OK(status)) {
 783                 goto done;
 784         }
 785
 786         result->binding_handle = rpccli_bh_create(result);
 787         if (result->binding_handle == NULL) {
 788                 status = NT_STATUS_NO_MEMORY;
 789                 DEBUG(0, ("Failed to create binding handle.\n"));
 790                 goto done;
 791         }
 792
 793         result->auth = talloc_zero(result, struct pipe_auth_data);
 794         if (!result->auth) {
 795                 status = NT_STATUS_NO_MEMORY;
 796                 goto done;
 797         }
 798         result->auth->auth_type = DCERPC_AUTH_TYPE_NONE;
 799         result->auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
 800
 801         status = rpccli_anon_bind_data(result, &auth);
 802         if (!NT_STATUS_IS_OK(status)) {
 803                 DEBUG(0, ("Failed to initialize anonymous bind.\n"));
 804                 goto done;
 805         }
 806
 807         status = rpc_pipe_bind(result, auth);
 808         if (!NT_STATUS_IS_OK(status)) {
 809                 DEBUG(0, ("Failed to bind external pipe.\n"));
 810                 goto done;
 811         }
 812
 813 done:
 814         if (!NT_STATUS_IS_OK(status)) {
 815                 TALLOC_FREE(result);
 816         }
 817         TALLOC_FREE(proxy_state);
 818         *_result = result;
 819         return status;
 820 }
 821
 822 /**
 823  * @brief Create a new RPC client context which uses a local dispatch function.
 824  *
 825  * @param mem_ctx       The memory context on which thje pipe will ultimately
 826  *                      be allocated
 827  * @param name          The pipe name to connect to.
 828  * @param session_info  Credentials to use for the connection.
 829  * @param pipe          [in|out] Checks if a pipe is connected, and connects it
 830  *                               if not
 831  *
 832  * @return              NT_STATUS_OK on success, a corresponding NT status if
 833  *                      an error occured.
 834  */
 835
 836 NTSTATUS rpc_pipe_open_interface(TALLOC_CTX *mem_ctx,
 837                                  const struct ndr_syntax_id *syntax,
 838                                  const struct auth_serversupplied_info *session_info,
 839                                  struct client_address *client_id,
 840                                  struct messaging_context *msg_ctx,
 841                                  struct rpc_pipe_client **cli_pipe)
 842 {
 843         struct rpc_pipe_client *cli = NULL;
 844         const char *server_type;
 845         const char *pipe_name;
 846         NTSTATUS status;
 847         TALLOC_CTX *tmp_ctx;
 848
 849         if (cli_pipe && rpccli_is_connected(*cli_pipe)) {
 850                 return NT_STATUS_OK;
 851         } else {
 852                 TALLOC_FREE(*cli_pipe);
 853         }
 854
 855         tmp_ctx = talloc_stackframe();
 856         if (tmp_ctx == NULL) {
 857                 return NT_STATUS_NO_MEMORY;
 858         }
 859
 860         pipe_name = get_pipe_name_from_syntax(tmp_ctx, syntax);
 861         if (pipe_name == NULL) {
 862                 status = NT_STATUS_INVALID_PARAMETER;
 863                 goto done;
 864         }
 865
 866         while (pipe_name[0] == '\\') {
 867                 pipe_name++;
 868         }
 869
 870         DEBUG(5, ("Connecting to %s pipe.\n", pipe_name));
 871
 872         server_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
 873                                            "rpc_server", pipe_name,
 874                                            "embedded");
 875
 876         if (StrCaseCmp(server_type, "embedded") == 0) {
 877                 status = rpc_pipe_open_internal(tmp_ctx,
 878                                                 syntax, session_info,
 879                                                 client_id, msg_ctx,
 880                                                 &cli);
 881                 if (!NT_STATUS_IS_OK(status)) {
 882                         goto done;
 883                 }
 884         } else if (StrCaseCmp(server_type, "daemon") == 0 ||
 885                    StrCaseCmp(server_type, "external") == 0) {
 886                 /* It would be nice to just use rpc_pipe_open_ncalrpc() but
 887                  * for now we need to use the special proxy setup to connect
 888                  * to spoolssd. */
 889
 890                 status = rpc_pipe_open_external(tmp_ctx,
 891                                                 pipe_name, syntax,
 892                                                 session_info,
 893                                                 &cli);
 894                 if (!NT_STATUS_IS_OK(status)) {
 895                         goto done;
 896                 }
 897         } else {
 898                 status = NT_STATUS_NOT_IMPLEMENTED;
 899                 DEBUG(0, ("Wrong servertype specified in config file: %s",
 900                           nt_errstr(status)));
 901                 goto done;
 902         }
 903
 904         status = NT_STATUS_OK;
 905 done:
 906         if (NT_STATUS_IS_OK(status)) {
 907                 *cli_pipe = talloc_move(mem_ctx, &cli);
 908         }
 909         TALLOC_FREE(tmp_ctx);
 910         return status;
 911 }