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 #include "auth.h"
  33 #include "ntdomain.h"
  34 #include "../lib/tsocket/tsocket.h"
  35 #include "../lib/util/tevent_ntstatus.h"
  36
  37 #undef DBGC_CLASS
  38 #define DBGC_CLASS DBGC_RPC_SRV
  39
  40 static int pipes_open;
  41
  42 static struct pipes_struct *InternalPipes;
  43
  44 /* TODO
  45  * the following prototypes are declared here to avoid
  46  * code being moved about too much for a patch to be
  47  * disrupted / less obvious.
  48  *
  49  * these functions, and associated functions that they
  50  * call, should be moved behind a .so module-loading
  51  * system _anyway_.  so that's the next step...
  52  */
  53
  54 /****************************************************************************
  55  Internal Pipe iterator functions.
  56 ****************************************************************************/
  57
  58 struct pipes_struct *get_first_internal_pipe(void)
  59 {
  60         return InternalPipes;
  61 }
  62
  63 struct pipes_struct *get_next_internal_pipe(struct pipes_struct *p)
  64 {
  65         return p->next;
  66 }
  67
  68 static void free_pipe_rpc_context_internal( PIPE_RPC_FNS *list )
  69 {
  70         PIPE_RPC_FNS *tmp = list;
  71         PIPE_RPC_FNS *tmp2;
  72
  73         while (tmp) {
  74                 tmp2 = tmp->next;
  75                 SAFE_FREE(tmp);
  76                 tmp = tmp2;
  77         }
  78
  79         return;
  80 }
  81
  82 bool check_open_pipes(void)
  83 {
  84         struct pipes_struct *p;
  85
  86         for (p = InternalPipes; p != NULL; p = p->next) {
  87                 if (num_pipe_handles(p) != 0) {
  88                         return true;
  89                 }
  90         }
  91         return false;
  92 }
  93
  94 /****************************************************************************
  95  Close an rpc pipe.
  96 ****************************************************************************/
  97
  98 int close_internal_rpc_pipe_hnd(struct pipes_struct *p)
  99 {
 100         if (!p) {
 101                 DEBUG(0,("Invalid pipe in close_internal_rpc_pipe_hnd\n"));
 102                 return False;
 103         }
 104
 105         TALLOC_FREE(p->auth.auth_ctx);
 106
 107         free_pipe_rpc_context_internal( p->contexts );
 108
 109         /* Free the handles database. */
 110         close_policy_by_pipe(p);
 111
 112         DLIST_REMOVE(InternalPipes, p);
 113
 114         ZERO_STRUCTP(p);
 115
 116         return 0;
 117 }
 118
 119 /****************************************************************************
 120  Make an internal namedpipes structure
 121 ****************************************************************************/
 122
 123 struct pipes_struct *make_internal_rpc_pipe_p(TALLOC_CTX *mem_ctx,
 124                                               const struct ndr_syntax_id *syntax,
 125                                               struct client_address *client_id,
 126                                               const struct auth_serversupplied_info *session_info,
 127                                               struct messaging_context *msg_ctx)
 128 {
 129         struct pipes_struct *p;
 130
 131         DEBUG(4,("Create pipe requested %s\n",
 132                  get_pipe_name_from_syntax(talloc_tos(), syntax)));
 133
 134         p = TALLOC_ZERO_P(mem_ctx, struct pipes_struct);
 135
 136         if (!p) {
 137                 DEBUG(0,("ERROR! no memory for pipes_struct!\n"));
 138                 return NULL;
 139         }
 140
 141         p->mem_ctx = talloc_named(p, 0, "pipe %s %p",
 142                                  get_pipe_name_from_syntax(talloc_tos(),
 143                                                            syntax), p);
 144         if (p->mem_ctx == NULL) {
 145                 DEBUG(0,("open_rpc_pipe_p: talloc_init failed.\n"));
 146                 TALLOC_FREE(p);
 147                 return NULL;
 148         }
 149
 150         if (!init_pipe_handles(p, syntax)) {
 151                 DEBUG(0,("open_rpc_pipe_p: init_pipe_handles failed.\n"));
 152                 TALLOC_FREE(p);
 153                 return NULL;
 154         }
 155
 156         p->session_info = copy_serverinfo(p, session_info);
 157         if (p->session_info == NULL) {
 158                 DEBUG(0, ("open_rpc_pipe_p: copy_serverinfo failed\n"));
 159                 close_policy_by_pipe(p);
 160                 TALLOC_FREE(p);
 161                 return NULL;
 162         }
 163
 164         p->msg_ctx = msg_ctx;
 165
 166         DLIST_ADD(InternalPipes, p);
 167
 168         p->client_id = client_id;
 169
 170         p->endian = RPC_LITTLE_ENDIAN;
 171
 172         p->syntax = *syntax;
 173         p->transport = NCALRPC;
 174
 175         DEBUG(4,("Created internal pipe %s (pipes_open=%d)\n",
 176                  get_pipe_name_from_syntax(talloc_tos(), syntax), pipes_open));
 177
 178         talloc_set_destructor(p, close_internal_rpc_pipe_hnd);
 179
 180         return p;
 181 }
 182
 183 static NTSTATUS rpcint_dispatch(struct pipes_struct *p,
 184                                 TALLOC_CTX *mem_ctx,
 185                                 uint32_t opnum,
 186                                 const DATA_BLOB *in_data,
 187                                 DATA_BLOB *out_data)
 188 {
 189         uint32_t num_cmds = rpc_srv_get_pipe_num_cmds(&p->syntax);
 190         const struct api_struct *cmds = rpc_srv_get_pipe_cmds(&p->syntax);
 191         uint32_t i;
 192         bool ok;
 193
 194         /* set opnum */
 195         p->opnum = opnum;
 196
 197         for (i = 0; i < num_cmds; i++) {
 198                 if (cmds[i].opnum == opnum && cmds[i].fn != NULL) {
 199                         break;
 200                 }
 201         }
 202
 203         if (i == num_cmds) {
 204                 return NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE;
 205         }
 206
 207         p->in_data.data = *in_data;
 208         p->out_data.rdata = data_blob_null;
 209
 210         ok = cmds[i].fn(p);
 211         p->in_data.data = data_blob_null;
 212         if (!ok) {
 213                 data_blob_free(&p->out_data.rdata);
 214                 talloc_free_children(p->mem_ctx);
 215                 return NT_STATUS_RPC_CALL_FAILED;
 216         }
 217
 218         if (p->fault_state) {
 219                 p->fault_state = false;
 220                 data_blob_free(&p->out_data.rdata);
 221                 talloc_free_children(p->mem_ctx);
 222                 return NT_STATUS_RPC_CALL_FAILED;
 223         }
 224
 225         if (p->bad_handle_fault_state) {
 226                 p->bad_handle_fault_state = false;
 227                 data_blob_free(&p->out_data.rdata);
 228                 talloc_free_children(p->mem_ctx);
 229                 return NT_STATUS_RPC_SS_CONTEXT_MISMATCH;
 230         }
 231
 232         if (p->rng_fault_state) {
 233                 p->rng_fault_state = false;
 234                 data_blob_free(&p->out_data.rdata);
 235                 talloc_free_children(p->mem_ctx);
 236                 return NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE;
 237         }
 238
 239         *out_data = p->out_data.rdata;
 240         talloc_steal(mem_ctx, out_data->data);
 241         p->out_data.rdata = data_blob_null;
 242
 243         talloc_free_children(p->mem_ctx);
 244         return NT_STATUS_OK;
 245 }
 246
 247 struct rpcint_bh_state {
 248         struct pipes_struct *p;
 249 };
 250
 251 static bool rpcint_bh_is_connected(struct dcerpc_binding_handle *h)
 252 {
 253         struct rpcint_bh_state *hs = dcerpc_binding_handle_data(h,
 254                                      struct rpcint_bh_state);
 255
 256         if (!hs->p) {
 257                 return false;
 258         }
 259
 260         return true;
 261 }
 262
 263 static uint32_t rpcint_bh_set_timeout(struct dcerpc_binding_handle *h,
 264                                       uint32_t timeout)
 265 {
 266         /* TODO: implement timeouts */
 267         return UINT32_MAX;
 268 }
 269
 270 struct rpcint_bh_raw_call_state {
 271         DATA_BLOB in_data;
 272         DATA_BLOB out_data;
 273         uint32_t out_flags;
 274 };
 275
 276 static struct tevent_req *rpcint_bh_raw_call_send(TALLOC_CTX *mem_ctx,
 277                                                   struct tevent_context *ev,
 278                                                   struct dcerpc_binding_handle *h,
 279                                                   const struct GUID *object,
 280                                                   uint32_t opnum,
 281                                                   uint32_t in_flags,
 282                                                   const uint8_t *in_data,
 283                                                   size_t in_length)
 284 {
 285         struct rpcint_bh_state *hs =
 286                 dcerpc_binding_handle_data(h,
 287                 struct rpcint_bh_state);
 288         struct tevent_req *req;
 289         struct rpcint_bh_raw_call_state *state;
 290         bool ok;
 291         NTSTATUS status;
 292
 293         req = tevent_req_create(mem_ctx, &state,
 294                                 struct rpcint_bh_raw_call_state);
 295         if (req == NULL) {
 296                 return NULL;
 297         }
 298         state->in_data.data = discard_const_p(uint8_t, in_data);
 299         state->in_data.length = in_length;
 300
 301         ok = rpcint_bh_is_connected(h);
 302         if (!ok) {
 303                 tevent_req_nterror(req, NT_STATUS_INVALID_CONNECTION);
 304                 return tevent_req_post(req, ev);
 305         }
 306
 307         /* TODO: allow async */
 308         status = rpcint_dispatch(hs->p, state, opnum,
 309                                  &state->in_data,
 310                                  &state->out_data);
 311         if (!NT_STATUS_IS_OK(status)) {
 312                 tevent_req_nterror(req, status);
 313                 return tevent_req_post(req, ev);
 314         }
 315
 316         tevent_req_done(req);
 317         return tevent_req_post(req, ev);
 318 }
 319
 320 static NTSTATUS rpcint_bh_raw_call_recv(struct tevent_req *req,
 321                                         TALLOC_CTX *mem_ctx,
 322                                         uint8_t **out_data,
 323                                         size_t *out_length,
 324                                         uint32_t *out_flags)
 325 {
 326         struct rpcint_bh_raw_call_state *state =
 327                 tevent_req_data(req,
 328                 struct rpcint_bh_raw_call_state);
 329         NTSTATUS status;
 330
 331         if (tevent_req_is_nterror(req, &status)) {
 332                 tevent_req_received(req);
 333                 return status;
 334         }
 335
 336         *out_data = talloc_move(mem_ctx, &state->out_data.data);
 337         *out_length = state->out_data.length;
 338         *out_flags = 0;
 339         tevent_req_received(req);
 340         return NT_STATUS_OK;
 341 }
 342
 343 struct rpcint_bh_disconnect_state {
 344         uint8_t _dummy;
 345 };
 346
 347 static struct tevent_req *rpcint_bh_disconnect_send(TALLOC_CTX *mem_ctx,
 348                                                 struct tevent_context *ev,
 349                                                 struct dcerpc_binding_handle *h)
 350 {
 351         struct rpcint_bh_state *hs = dcerpc_binding_handle_data(h,
 352                                      struct rpcint_bh_state);
 353         struct tevent_req *req;
 354         struct rpcint_bh_disconnect_state *state;
 355         bool ok;
 356
 357         req = tevent_req_create(mem_ctx, &state,
 358                                 struct rpcint_bh_disconnect_state);
 359         if (req == NULL) {
 360                 return NULL;
 361         }
 362
 363         ok = rpcint_bh_is_connected(h);
 364         if (!ok) {
 365                 tevent_req_nterror(req, NT_STATUS_INVALID_CONNECTION);
 366                 return tevent_req_post(req, ev);
 367         }
 368
 369         /*
 370          * TODO: do a real async disconnect ...
 371          *
 372          * For now the caller needs to free pipes_struct
 373          */
 374         hs->p = NULL;
 375
 376         tevent_req_done(req);
 377         return tevent_req_post(req, ev);
 378 }
 379
 380 static NTSTATUS rpcint_bh_disconnect_recv(struct tevent_req *req)
 381 {
 382         NTSTATUS status;
 383
 384         if (tevent_req_is_nterror(req, &status)) {
 385                 tevent_req_received(req);
 386                 return status;
 387         }
 388
 389         tevent_req_received(req);
 390         return NT_STATUS_OK;
 391 }
 392
 393 static bool rpcint_bh_ref_alloc(struct dcerpc_binding_handle *h)
 394 {
 395         return true;
 396 }
 397
 398 static void rpcint_bh_do_ndr_print(struct dcerpc_binding_handle *h,
 399                                    int ndr_flags,
 400                                    const void *_struct_ptr,
 401                                    const struct ndr_interface_call *call)
 402 {
 403         void *struct_ptr = discard_const(_struct_ptr);
 404
 405         if (DEBUGLEVEL < 11) {
 406                 return;
 407         }
 408
 409         if (ndr_flags & NDR_IN) {
 410                 ndr_print_function_debug(call->ndr_print,
 411                                          call->name,
 412                                          ndr_flags,
 413                                          struct_ptr);
 414         }
 415         if (ndr_flags & NDR_OUT) {
 416                 ndr_print_function_debug(call->ndr_print,
 417                                          call->name,
 418                                          ndr_flags,
 419                                          struct_ptr);
 420         }
 421 }
 422
 423 static const struct dcerpc_binding_handle_ops rpcint_bh_ops = {
 424         .name                   = "rpcint",
 425         .is_connected           = rpcint_bh_is_connected,
 426         .set_timeout            = rpcint_bh_set_timeout,
 427         .raw_call_send          = rpcint_bh_raw_call_send,
 428         .raw_call_recv          = rpcint_bh_raw_call_recv,
 429         .disconnect_send        = rpcint_bh_disconnect_send,
 430         .disconnect_recv        = rpcint_bh_disconnect_recv,
 431
 432         .ref_alloc              = rpcint_bh_ref_alloc,
 433         .do_ndr_print           = rpcint_bh_do_ndr_print,
 434 };
 435
 436 static NTSTATUS rpcint_binding_handle_ex(TALLOC_CTX *mem_ctx,
 437                         const struct ndr_syntax_id *abstract_syntax,
 438                         const struct ndr_interface_table *ndr_table,
 439                         struct client_address *client_id,
 440                         const struct auth_serversupplied_info *session_info,
 441                         struct messaging_context *msg_ctx,
 442                         struct dcerpc_binding_handle **binding_handle)
 443 {
 444         struct dcerpc_binding_handle *h;
 445         struct rpcint_bh_state *hs;
 446
 447         if (ndr_table) {
 448                 abstract_syntax = &ndr_table->syntax_id;
 449         }
 450
 451         h = dcerpc_binding_handle_create(mem_ctx,
 452                                          &rpcint_bh_ops,
 453                                          NULL,
 454                                          ndr_table,
 455                                          &hs,
 456                                          struct rpcint_bh_state,
 457                                          __location__);
 458         if (h == NULL) {
 459                 return NT_STATUS_NO_MEMORY;
 460         }
 461         hs->p = make_internal_rpc_pipe_p(hs,
 462                                          abstract_syntax,
 463                                          client_id,
 464                                          session_info,
 465                                          msg_ctx);
 466         if (hs->p == NULL) {
 467                 TALLOC_FREE(h);
 468                 return NT_STATUS_NO_MEMORY;
 469         }
 470
 471         *binding_handle = h;
 472         return NT_STATUS_OK;
 473 }
 474 /**
 475  * @brief Create a new DCERPC Binding Handle which uses a local dispatch function.
 476  *
 477  * @param[in]  mem_ctx  The memory context to use.
 478  *
 479  * @param[in]  ndr_table Normally the ndr_table_<name>.
 480  *
 481  * @param[in]  client_id The info about the connected client.
 482  *
 483  * @param[in]  serversupplied_info The server supplied authentication function.
 484  *
 485  * @param[in]  msg_ctx   The messaging context that can be used by the server
 486  *
 487  * @param[out] binding_handle  A pointer to store the connected
 488  *                             dcerpc_binding_handle
 489  *
 490  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 491  *                      error occured.
 492  *
 493  * @code
 494  *   struct dcerpc_binding_handle *winreg_binding;
 495  *   NTSTATUS status;
 496  *
 497  *   status = rpcint_binding_handle(tmp_ctx,
 498  *                                  &ndr_table_winreg,
 499  *                                  p->client_id,
 500  *                                  p->session_info,
 501  *                                  p->msg_ctx
 502  *                                  &winreg_binding);
 503  * @endcode
 504  */
 505 NTSTATUS rpcint_binding_handle(TALLOC_CTX *mem_ctx,
 506                                const struct ndr_interface_table *ndr_table,
 507                                struct client_address *client_id,
 508                                const struct auth_serversupplied_info *session_info,
 509                                struct messaging_context *msg_ctx,
 510                                struct dcerpc_binding_handle **binding_handle)
 511 {
 512         return rpcint_binding_handle_ex(mem_ctx, NULL, ndr_table, client_id,
 513                                         session_info, msg_ctx, binding_handle);
 514 }
 515
 516 /**
 517  * @internal
 518  *
 519  * @brief Create a new RPC client context which uses a local transport.
 520  *
 521  * This creates a local transport. It is a shortcut to directly call the server
 522  * functions and avoid marshalling.
 523  * NOTE: this function should be used only by rpc_pipe_open_interface()
 524  *
 525  * @param[in]  mem_ctx  The memory context to use.
 526  *
 527  * @param[in]  abstract_syntax Normally the syntax_id of the autogenerated
 528  *                             ndr_table_<name>.
 529  *
 530  * @param[in]  serversupplied_info The server supplied authentication function.
 531  *
 532  * @param[in]  client_id The client address information.
 533  *
 534  * @param[in]  msg_ctx  The messaging context to use.
 535  *
 536  * @param[out] presult  A pointer to store the connected rpc client pipe.
 537  *
 538  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 539  *                      error occured.
 540  */
 541 static NTSTATUS rpc_pipe_open_internal(TALLOC_CTX *mem_ctx,
 542                                 const struct ndr_syntax_id *abstract_syntax,
 543                                 const struct auth_serversupplied_info *serversupplied_info,
 544                                 struct client_address *client_id,
 545                                 struct messaging_context *msg_ctx,
 546                                 struct rpc_pipe_client **presult)
 547 {
 548         struct rpc_pipe_client *result;
 549         NTSTATUS status;
 550
 551         result = TALLOC_ZERO_P(mem_ctx, struct rpc_pipe_client);
 552         if (result == NULL) {
 553                 return NT_STATUS_NO_MEMORY;
 554         }
 555
 556         result->abstract_syntax = *abstract_syntax;
 557         result->transfer_syntax = ndr_transfer_syntax;
 558
 559         if (client_id == NULL) {
 560                 static struct client_address unknown;
 561                 strlcpy(unknown.addr, "<UNKNOWN>", sizeof(unknown.addr));
 562                 unknown.name = "<UNKNOWN>";
 563                 client_id = &unknown;
 564         }
 565
 566         result->max_xmit_frag = -1;
 567         result->max_recv_frag = -1;
 568
 569         status = rpcint_binding_handle_ex(result,
 570                                           abstract_syntax,
 571                                           NULL,
 572                                           client_id,
 573                                           serversupplied_info,
 574                                           msg_ctx,
 575                                           &result->binding_handle);
 576         if (!NT_STATUS_IS_OK(status)) {
 577                 TALLOC_FREE(result);
 578                 return status;
 579         }
 580
 581         *presult = result;
 582         return NT_STATUS_OK;
 583 }
 584
 585 /****************************************************************************
 586  * External pipes functions
 587  ***************************************************************************/
 588
 589
 590 struct np_proxy_state *make_external_rpc_pipe_p(TALLOC_CTX *mem_ctx,
 591                                 const char *pipe_name,
 592                                 const struct tsocket_address *local_address,
 593                                 const struct tsocket_address *remote_address,
 594                                 const struct auth_serversupplied_info *session_info)
 595 {
 596         struct np_proxy_state *result;
 597         char *socket_np_dir;
 598         const char *socket_dir;
 599         struct tevent_context *ev;
 600         struct tevent_req *subreq;
 601         struct auth_session_info_transport *session_info_t;
 602         struct auth_session_info *session_info_npa;
 603         struct auth_user_info_dc *user_info_dc;
 604         union netr_Validation val;
 605         NTSTATUS status;
 606         bool ok;
 607         int ret;
 608         int sys_errno;
 609
 610         result = talloc(mem_ctx, struct np_proxy_state);
 611         if (result == NULL) {
 612                 DEBUG(0, ("talloc failed\n"));
 613                 return NULL;
 614         }
 615
 616         result->read_queue = tevent_queue_create(result, "np_read");
 617         if (result->read_queue == NULL) {
 618                 DEBUG(0, ("tevent_queue_create failed\n"));
 619                 goto fail;
 620         }
 621
 622         result->write_queue = tevent_queue_create(result, "np_write");
 623         if (result->write_queue == NULL) {
 624                 DEBUG(0, ("tevent_queue_create failed\n"));
 625                 goto fail;
 626         }
 627
 628         ev = s3_tevent_context_init(talloc_tos());
 629         if (ev == NULL) {
 630                 DEBUG(0, ("s3_tevent_context_init failed\n"));
 631                 goto fail;
 632         }
 633
 634         socket_dir = lp_parm_const_string(
 635                 GLOBAL_SECTION_SNUM, "external_rpc_pipe", "socket_dir",
 636                 lp_ncalrpc_dir());
 637         if (socket_dir == NULL) {
 638                 DEBUG(0, ("externan_rpc_pipe:socket_dir not set\n"));
 639                 goto fail;
 640         }
 641         socket_np_dir = talloc_asprintf(talloc_tos(), "%s/np", socket_dir);
 642         if (socket_np_dir == NULL) {
 643                 DEBUG(0, ("talloc_asprintf failed\n"));
 644                 goto fail;
 645         }
 646
 647         session_info_npa = talloc_zero(talloc_tos(), struct auth_session_info);
 648         if (session_info_npa == NULL) {
 649                 DEBUG(0, ("talloc failed\n"));
 650                 goto fail;
 651         }
 652
 653         /* Send the named_pipe_auth server the user's full token */
 654         session_info_npa->security_token = session_info->security_token;
 655         session_info_npa->session_key = session_info->session_key;
 656
 657         val.sam3 = session_info->info3;
 658
 659         /* Convert into something we can build a struct
 660          * auth_session_info from.  Most of the work here
 661          * will be to convert the SIDS, which we will then ignore, but
 662          * this is the easier way to handle it */
 663         status = make_user_info_dc_netlogon_validation(talloc_tos(), "", 3, &val, &user_info_dc);
 664         if (!NT_STATUS_IS_OK(status)) {
 665                 DEBUG(0, ("conversion of info3 into user_info_dc failed!\n"));
 666                 goto fail;
 667         }
 668
 669         session_info_npa->info = talloc_move(session_info_npa, &user_info_dc->info);
 670         talloc_free(user_info_dc);
 671
 672         session_info_t = talloc_zero(talloc_tos(), struct auth_session_info_transport);
 673         if (session_info_npa == NULL) {
 674                 DEBUG(0, ("talloc failed\n"));
 675                 goto fail;
 676         }
 677
 678         session_info_t->session_info = talloc_steal(session_info_t, session_info_npa);
 679
 680         become_root();
 681         subreq = tstream_npa_connect_send(talloc_tos(), ev,
 682                                           socket_np_dir,
 683                                           pipe_name,
 684                                           remote_address, /* client_addr */
 685                                           NULL, /* client_name */
 686                                           local_address, /* server_addr */
 687                                           NULL, /* server_name */
 688                                           session_info_t);
 689         if (subreq == NULL) {
 690                 unbecome_root();
 691                 DEBUG(0, ("tstream_npa_connect_send to %s for pipe %s and "
 692                           "user %s\\%s failed\n",
 693                           socket_np_dir, pipe_name, session_info_t->session_info->info->domain_name,
 694                           session_info_t->session_info->info->account_name));
 695                 goto fail;
 696         }
 697         ok = tevent_req_poll(subreq, ev);
 698         unbecome_root();
 699         if (!ok) {
 700                 DEBUG(0, ("tevent_req_poll to %s for pipe %s and user %s\\%s "
 701                           "failed for tstream_npa_connect: %s\n",
 702                           socket_np_dir, pipe_name, session_info_t->session_info->info->domain_name,
 703                           session_info_t->session_info->info->account_name,
 704                           strerror(errno)));
 705                 goto fail;
 706
 707         }
 708         ret = tstream_npa_connect_recv(subreq, &sys_errno,
 709                                        result,
 710                                        &result->npipe,
 711                                        &result->file_type,
 712                                        &result->device_state,
 713                                        &result->allocation_size);
 714         TALLOC_FREE(subreq);
 715         if (ret != 0) {
 716                 DEBUG(0, ("tstream_npa_connect_recv  to %s for pipe %s and "
 717                           "user %s\\%s failed: %s\n",
 718                           socket_np_dir, pipe_name, session_info_t->session_info->info->domain_name,
 719                           session_info_t->session_info->info->account_name,
 720                           strerror(sys_errno)));
 721                 goto fail;
 722         }
 723
 724         return result;
 725
 726  fail:
 727         TALLOC_FREE(result);
 728         return NULL;
 729 }
 730
 731 static NTSTATUS rpc_pipe_open_external(TALLOC_CTX *mem_ctx,
 732                                 const char *pipe_name,
 733                                 const struct ndr_syntax_id *abstract_syntax,
 734                                 const struct auth_serversupplied_info *session_info,
 735                                 struct rpc_pipe_client **_result)
 736 {
 737         struct tsocket_address *local, *remote;
 738         struct rpc_pipe_client *result = NULL;
 739         struct np_proxy_state *proxy_state = NULL;
 740         struct pipe_auth_data *auth;
 741         NTSTATUS status;
 742         int ret;
 743
 744         /* this is an internal connection, fake up ip addresses */
 745         ret = tsocket_address_inet_from_strings(talloc_tos(), "ip",
 746                                                 NULL, 0, &local);
 747         if (ret) {
 748                 return NT_STATUS_NO_MEMORY;
 749         }
 750         ret = tsocket_address_inet_from_strings(talloc_tos(), "ip",
 751                                                 NULL, 0, &remote);
 752         if (ret) {
 753                 return NT_STATUS_NO_MEMORY;
 754         }
 755
 756         proxy_state = make_external_rpc_pipe_p(mem_ctx, pipe_name,
 757                                                 local, remote, session_info);
 758         if (!proxy_state) {
 759                 return NT_STATUS_UNSUCCESSFUL;
 760         }
 761
 762         result = talloc_zero(mem_ctx, struct rpc_pipe_client);
 763         if (result == NULL) {
 764                 status = NT_STATUS_NO_MEMORY;
 765                 goto done;
 766         }
 767
 768         result->abstract_syntax = *abstract_syntax;
 769         result->transfer_syntax = ndr_transfer_syntax;
 770
 771         result->desthost = get_myname(result);
 772         result->srv_name_slash = talloc_asprintf_strupper_m(
 773                 result, "\\\\%s", result->desthost);
 774         if ((result->desthost == NULL) || (result->srv_name_slash == NULL)) {
 775                 status = NT_STATUS_NO_MEMORY;
 776                 goto done;
 777         }
 778
 779         result->max_xmit_frag = RPC_MAX_PDU_FRAG_LEN;
 780         result->max_recv_frag = RPC_MAX_PDU_FRAG_LEN;
 781
 782         status = rpc_transport_tstream_init(result,
 783                                             &proxy_state->npipe,
 784                                             &result->transport);
 785         if (!NT_STATUS_IS_OK(status)) {
 786                 goto done;
 787         }
 788
 789         result->binding_handle = rpccli_bh_create(result);
 790         if (result->binding_handle == NULL) {
 791                 status = NT_STATUS_NO_MEMORY;
 792                 DEBUG(0, ("Failed to create binding handle.\n"));
 793                 goto done;
 794         }
 795
 796         result->auth = talloc_zero(result, struct pipe_auth_data);
 797         if (!result->auth) {
 798                 status = NT_STATUS_NO_MEMORY;
 799                 goto done;
 800         }
 801         result->auth->auth_type = DCERPC_AUTH_TYPE_NONE;
 802         result->auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
 803
 804         status = rpccli_anon_bind_data(result, &auth);
 805         if (!NT_STATUS_IS_OK(status)) {
 806                 DEBUG(0, ("Failed to initialize anonymous bind.\n"));
 807                 goto done;
 808         }
 809
 810         status = rpc_pipe_bind(result, auth);
 811         if (!NT_STATUS_IS_OK(status)) {
 812                 DEBUG(0, ("Failed to bind external pipe.\n"));
 813                 goto done;
 814         }
 815
 816 done:
 817         if (!NT_STATUS_IS_OK(status)) {
 818                 TALLOC_FREE(result);
 819         }
 820         TALLOC_FREE(proxy_state);
 821         *_result = result;
 822         return status;
 823 }
 824
 825 /**
 826  * @brief Create a new RPC client context which uses a local dispatch function
 827  *        or a remote transport, depending on rpc_server configuration for the
 828  *        specific service.
 829  *
 830  * @param[in]  mem_ctx  The memory context to use.
 831  *
 832  * @param[in]  abstract_syntax Normally the syntax_id of the autogenerated
 833  *                             ndr_table_<name>.
 834  *
 835  * @param[in]  serversupplied_info The server supplied authentication function.
 836  *
 837  * @param[in]  client_id The client address information.
 838  *
 839  * @param[in]  msg_ctx  The messaging context to use.
 840  *
 841  * @param[out] presult  A pointer to store the connected rpc client pipe.
 842  *
 843  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 844  *                      error occured.
 845  *
 846  * @code
 847  *   struct rpc_pipe_client *winreg_pipe;
 848  *   NTSTATUS status;
 849  *
 850  *   status = rpc_pipe_open_interface(tmp_ctx,
 851  *                                    &ndr_table_winreg.syntax_id,
 852  *                                    p->session_info,
 853  *                                    client_id,
 854  *                                    &winreg_pipe);
 855  * @endcode
 856  */
 857
 858 NTSTATUS rpc_pipe_open_interface(TALLOC_CTX *mem_ctx,
 859                                  const struct ndr_syntax_id *syntax,
 860                                  const struct auth_serversupplied_info *session_info,
 861                                  struct client_address *client_id,
 862                                  struct messaging_context *msg_ctx,
 863                                  struct rpc_pipe_client **cli_pipe)
 864 {
 865         struct rpc_pipe_client *cli = NULL;
 866         const char *server_type;
 867         const char *pipe_name;
 868         NTSTATUS status;
 869         TALLOC_CTX *tmp_ctx;
 870
 871         if (cli_pipe && rpccli_is_connected(*cli_pipe)) {
 872                 return NT_STATUS_OK;
 873         } else {
 874                 TALLOC_FREE(*cli_pipe);
 875         }
 876
 877         tmp_ctx = talloc_stackframe();
 878         if (tmp_ctx == NULL) {
 879                 return NT_STATUS_NO_MEMORY;
 880         }
 881
 882         pipe_name = get_pipe_name_from_syntax(tmp_ctx, syntax);
 883         if (pipe_name == NULL) {
 884                 status = NT_STATUS_INVALID_PARAMETER;
 885                 goto done;
 886         }
 887
 888         while (pipe_name[0] == '\\') {
 889                 pipe_name++;
 890         }
 891
 892         DEBUG(5, ("Connecting to %s pipe.\n", pipe_name));
 893
 894         server_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
 895                                            "rpc_server", pipe_name,
 896                                            "embedded");
 897
 898         if (StrCaseCmp(server_type, "embedded") == 0) {
 899                 status = rpc_pipe_open_internal(tmp_ctx,
 900                                                 syntax, session_info,
 901                                                 client_id, msg_ctx,
 902                                                 &cli);
 903                 if (!NT_STATUS_IS_OK(status)) {
 904                         goto done;
 905                 }
 906         } else if (StrCaseCmp(server_type, "daemon") == 0 ||
 907                    StrCaseCmp(server_type, "external") == 0) {
 908                 /* It would be nice to just use rpc_pipe_open_ncalrpc() but
 909                  * for now we need to use the special proxy setup to connect
 910                  * to spoolssd. */
 911
 912                 status = rpc_pipe_open_external(tmp_ctx,
 913                                                 pipe_name, syntax,
 914                                                 session_info,
 915                                                 &cli);
 916                 if (!NT_STATUS_IS_OK(status)) {
 917                         goto done;
 918                 }
 919         } else {
 920                 status = NT_STATUS_NOT_IMPLEMENTED;
 921                 DEBUG(0, ("Wrong servertype specified in config file: %s",
 922                           nt_errstr(status)));
 923                 goto done;
 924         }
 925
 926         status = NT_STATUS_OK;
 927 done:
 928         if (NT_STATUS_IS_OK(status)) {
 929                 *cli_pipe = talloc_move(mem_ctx, &cli);
 930         }
 931         TALLOC_FREE(tmp_ctx);
 932         return status;
 933 }