source3/libsmb/libsmb_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SMB client library implementation
   4    Copyright (C) Andrew Tridgell 1998
   5    Copyright (C) Richard Sharpe 2000, 2002
   6    Copyright (C) John Terpstra 2000
   7    Copyright (C) Tom Jansen (Ninja ISD) 2002
   8    Copyright (C) Derrell Lipman 2003-2008
   9    Copyright (C) Jeremy Allison 2007, 2008
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "libsmbclient.h"
  27 #include "libsmb_internal.h"
  28
  29
  30 /*
  31  * Check a server for being alive and well.
  32  * returns 0 if the server is in shape. Returns 1 on error
  33  *
  34  * Also useable outside libsmbclient to enable external cache
  35  * to do some checks too.
  36  */
  37 int
  38 SMBC_check_server(SMBCCTX * context,
  39                   SMBCSRV * server)
  40 {
  41         socklen_t size;
  42         struct sockaddr addr;
  43
  44         size = sizeof(addr);
  45         return (getpeername(server->cli->fd, &addr, &size) == -1);
  46 }
  47
  48 /*
  49  * Remove a server from the cached server list it's unused.
  50  * On success, 0 is returned. 1 is returned if the server could not be removed.
  51  *
  52  * Also useable outside libsmbclient
  53  */
  54 int
  55 SMBC_remove_unused_server(SMBCCTX * context,
  56                           SMBCSRV * srv)
  57 {
  58         SMBCFILE * file;
  59
  60         /* are we being fooled ? */
  61         if (!context || !context->internal->initialized || !srv) {
  62                 return 1;
  63         }
  64
  65         /* Check all open files/directories for a relation with this server */
  66         for (file = context->internal->files; file; file = file->next) {
  67                 if (file->srv == srv) {
  68                         /* Still used */
  69                         DEBUG(3, ("smbc_remove_usused_server: "
  70                                   "%p still used by %p.\n",
  71                                   srv, file));
  72                         return 1;
  73                 }
  74         }
  75
  76         DLIST_REMOVE(context->internal->servers, srv);
  77
  78         cli_shutdown(srv->cli);
  79         srv->cli = NULL;
  80
  81         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  82
  83         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  84
  85         SAFE_FREE(srv);
  86         return 0;
  87 }
  88
  89 /****************************************************************
  90  * Call the auth_fn with fixed size (fstring) buffers.
  91  ***************************************************************/
  92 void
  93 SMBC_call_auth_fn(TALLOC_CTX *ctx,
  94                   SMBCCTX *context,
  95                   const char *server,
  96                   const char *share,
  97                   char **pp_workgroup,
  98                   char **pp_username,
  99                   char **pp_password)
 100 {
 101         fstring workgroup;
 102         fstring username;
 103         fstring password;
 104         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 105
 106         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 107         strlcpy(username, *pp_username, sizeof(username));
 108         strlcpy(password, *pp_password, sizeof(password));
 109
 110         /* See if there's an authentication with context function provided */
 111         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 112         if (auth_with_context_fn)
 113         {
 114             (* auth_with_context_fn)(context,
 115                                      server, share,
 116                                      workgroup, sizeof(workgroup),
 117                                      username, sizeof(username),
 118                                      password, sizeof(password));
 119         }
 120         else
 121         {
 122             smbc_getFunctionAuthData(context)(server, share,
 123                                               workgroup, sizeof(workgroup),
 124                                               username, sizeof(username),
 125                                               password, sizeof(password));
 126         }
 127
 128         TALLOC_FREE(*pp_workgroup);
 129         TALLOC_FREE(*pp_username);
 130         TALLOC_FREE(*pp_password);
 131
 132         *pp_workgroup = talloc_strdup(ctx, workgroup);
 133         *pp_username = talloc_strdup(ctx, username);
 134         *pp_password = talloc_strdup(ctx, password);
 135 }
 136
 137
 138 void
 139 SMBC_get_auth_data(const char *server, const char *share,
 140                    char *workgroup_buf, int workgroup_buf_len,
 141                    char *username_buf, int username_buf_len,
 142                    char *password_buf, int password_buf_len)
 143 {
 144         /* Default function just uses provided data.  Nothing to do. */
 145 }
 146
 147
 148
 149 SMBCSRV *
 150 SMBC_find_server(TALLOC_CTX *ctx,
 151                  SMBCCTX *context,
 152                  const char *server,
 153                  const char *share,
 154                  char **pp_workgroup,
 155                  char **pp_username,
 156                  char **pp_password)
 157 {
 158         SMBCSRV *srv;
 159         int auth_called = 0;
 160
 161         if (!pp_workgroup || !pp_username || !pp_password) {
 162                 return NULL;
 163         }
 164
 165 check_server_cache:
 166
 167         srv = smbc_getFunctionGetCachedServer(context)(context,
 168                                                        server, share,
 169                                                        *pp_workgroup,
 170                                                        *pp_username);
 171
 172         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 173                                      !*pp_password || !(*pp_password)[0])) {
 174                 SMBC_call_auth_fn(ctx, context, server, share,
 175                                   pp_workgroup, pp_username, pp_password);
 176
 177                 /*
 178                  * However, smbc_auth_fn may have picked up info relating to
 179                  * an existing connection, so try for an existing connection
 180                  * again ...
 181                  */
 182                 auth_called = 1;
 183                 goto check_server_cache;
 184
 185         }
 186
 187         if (srv) {
 188                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 189                         /*
 190                          * This server is no good anymore
 191                          * Try to remove it and check for more possible
 192                          * servers in the cache
 193                          */
 194                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 195                                                                         srv)) {
 196                                 /*
 197                                  * We could not remove the server completely,
 198                                  * remove it from the cache so we will not get
 199                                  * it again. It will be removed when the last
 200                                  * file/dir is closed.
 201                                  */
 202                                 smbc_getFunctionRemoveCachedServer(context)(context,
 203                                                                             srv);
 204                         }
 205
 206                         /*
 207                          * Maybe there are more cached connections to this
 208                          * server
 209                          */
 210                         goto check_server_cache;
 211                 }
 212
 213                 return srv;
 214         }
 215
 216         return NULL;
 217 }
 218
 219 /*
 220  * Connect to a server, possibly on an existing connection
 221  *
 222  * Here, what we want to do is: If the server and username
 223  * match an existing connection, reuse that, otherwise, establish a
 224  * new connection.
 225  *
 226  * If we have to create a new connection, call the auth_fn to get the
 227  * info we need, unless the username and password were passed in.
 228  */
 229
 230 SMBCSRV *
 231 SMBC_server(TALLOC_CTX *ctx,
 232             SMBCCTX *context,
 233             bool connect_if_not_found,
 234             const char *server,
 235             const char *share,
 236             char **pp_workgroup,
 237             char **pp_username,
 238             char **pp_password)
 239 {
 240         SMBCSRV *srv=NULL;
 241         struct cli_state *c;
 242         struct nmb_name called, calling;
 243         const char *server_n = server;
 244         struct sockaddr_storage ss;
 245         int tried_reverse = 0;
 246         int port_try_first;
 247         int port_try_next;
 248         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 249         uint32 fs_attrs = 0;
 250         const char *username_used;
 251         NTSTATUS status;
 252
 253         zero_sockaddr(&ss);
 254         ZERO_STRUCT(c);
 255
 256         if (server[0] == 0) {
 257                 errno = EPERM;
 258                 return NULL;
 259         }
 260
 261         /* Look for a cached connection */
 262         srv = SMBC_find_server(ctx, context, server, share,
 263                                pp_workgroup, pp_username, pp_password);
 264
 265         /*
 266          * If we found a connection and we're only allowed one share per
 267          * server...
 268          */
 269         if (srv &&
 270             *share != '\0' &&
 271             smbc_getOptionOneSharePerServer(context)) {
 272
 273                 /*
 274                  * ... then if there's no current connection to the share,
 275                  * connect to it.  SMBC_find_server(), or rather the function
 276                  * pointed to by context->get_cached_srv_fn which
 277                  * was called by SMBC_find_server(), will have issued a tree
 278                  * disconnect if the requested share is not the same as the
 279                  * one that was already connected.
 280                  */
 281                 if (srv->cli->cnum == (uint16) -1) {
 282                         /* Ensure we have accurate auth info */
 283                         SMBC_call_auth_fn(ctx, context, server, share,
 284                                           pp_workgroup,
 285                                           pp_username,
 286                                           pp_password);
 287
 288                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 289                                 errno = ENOMEM;
 290                                 cli_shutdown(srv->cli);
 291                                 srv->cli = NULL;
 292                                 smbc_getFunctionRemoveCachedServer(context)(context,
 293                                                                             srv);
 294                                 return NULL;
 295                         }
 296
 297                         /*
 298                          * We don't need to renegotiate encryption
 299                          * here as the encryption context is not per
 300                          * tid.
 301                          */
 302
 303                         if (!cli_send_tconX(srv->cli, share, "?????",
 304                                             *pp_password,
 305                                             strlen(*pp_password)+1)) {
 306
 307                                 errno = SMBC_errno(context, srv->cli);
 308                                 cli_shutdown(srv->cli);
 309                                 srv->cli = NULL;
 310                                 smbc_getFunctionRemoveCachedServer(context)(context,
 311                                                                             srv);
 312                                 srv = NULL;
 313                         }
 314
 315                         /* Determine if this share supports case sensitivity */
 316                         if (is_ipc) {
 317                                 DEBUG(4,
 318                                       ("IPC$ so ignore case sensitivity\n"));
 319                         } else if (!cli_get_fs_attr_info(c, &fs_attrs)) {
 320                                 DEBUG(4, ("Could not retrieve "
 321                                           "case sensitivity flag: %s.\n",
 322                                           cli_errstr(c)));
 323
 324                                 /*
 325                                  * We can't determine the case sensitivity of
 326                                  * the share. We have no choice but to use the
 327                                  * user-specified case sensitivity setting.
 328                                  */
 329                                 if (smbc_getOptionCaseSensitive(context)) {
 330                                         cli_set_case_sensitive(c, True);
 331                                 } else {
 332                                         cli_set_case_sensitive(c, False);
 333                                 }
 334                         } else {
 335                                 DEBUG(4,
 336                                       ("Case sensitive: %s\n",
 337                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 338                                         ? "True"
 339                                         : "False")));
 340                                 cli_set_case_sensitive(
 341                                         c,
 342                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 343                                          ? True
 344                                          : False));
 345                         }
 346
 347                         /*
 348                          * Regenerate the dev value since it's based on both
 349                          * server and share
 350                          */
 351                         if (srv) {
 352                                 srv->dev = (dev_t)(str_checksum(server) ^
 353                                                    str_checksum(share));
 354                         }
 355                 }
 356         }
 357
 358         /* If we have a connection... */
 359         if (srv) {
 360
 361                 /* ... then we're done here.  Give 'em what they came for. */
 362                 return srv;
 363         }
 364
 365         /* If we're not asked to connect when a connection doesn't exist... */
 366         if (! connect_if_not_found) {
 367                 /* ... then we're done here. */
 368                 return NULL;
 369         }
 370
 371         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 372                 errno = ENOMEM;
 373                 return NULL;
 374         }
 375
 376         make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
 377         make_nmb_name(&called , server, 0x20);
 378
 379         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 380
 381         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 382
 383 again:
 384
 385         zero_sockaddr(&ss);
 386
 387         /* have to open a new connection */
 388         if ((c = cli_initialise()) == NULL) {
 389                 errno = ENOMEM;
 390                 return NULL;
 391         }
 392
 393         if (smbc_getOptionUseKerberos(context)) {
 394                 c->use_kerberos = True;
 395         }
 396
 397         if (smbc_getOptionFallbackAfterKerberos(context)) {
 398                 c->fallback_after_kerberos = True;
 399         }
 400
 401         c->timeout = smbc_getTimeout(context);
 402
 403         /*
 404          * Force use of port 139 for first try if share is $IPC, empty, or
 405          * null, so browse lists can work
 406          */
 407         if (share == NULL || *share == '\0' || is_ipc) {
 408                 port_try_first = 139;
 409                 port_try_next = 445;
 410         } else {
 411                 port_try_first = 445;
 412                 port_try_next = 139;
 413         }
 414
 415         c->port = port_try_first;
 416
 417         status = cli_connect(c, server_n, &ss);
 418         if (!NT_STATUS_IS_OK(status)) {
 419
 420                 /* First connection attempt failed.  Try alternate port. */
 421                 c->port = port_try_next;
 422
 423                 status = cli_connect(c, server_n, &ss);
 424                 if (!NT_STATUS_IS_OK(status)) {
 425                         cli_shutdown(c);
 426                         errno = ETIMEDOUT;
 427                         return NULL;
 428                 }
 429         }
 430
 431         if (!cli_session_request(c, &calling, &called)) {
 432                 cli_shutdown(c);
 433                 if (strcmp(called.name, "*SMBSERVER")) {
 434                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 435                         goto again;
 436                 } else {  /* Try one more time, but ensure we don't loop */
 437
 438                         /* Only try this if server is an IP address ... */
 439
 440                         if (is_ipaddress(server) && !tried_reverse) {
 441                                 fstring remote_name;
 442                                 struct sockaddr_storage rem_ss;
 443
 444                                 if (!interpret_string_addr(&rem_ss, server,
 445                                                            NI_NUMERICHOST)) {
 446                                         DEBUG(4, ("Could not convert IP address "
 447                                                   "%s to struct sockaddr_storage\n",
 448                                                   server));
 449                                         errno = ETIMEDOUT;
 450                                         return NULL;
 451                                 }
 452
 453                                 tried_reverse++; /* Yuck */
 454
 455                                 if (name_status_find("*", 0, 0,
 456                                                      &rem_ss, remote_name)) {
 457                                         make_nmb_name(&called,
 458                                                       remote_name,
 459                                                       0x20);
 460                                         goto again;
 461                                 }
 462                         }
 463                 }
 464                 errno = ETIMEDOUT;
 465                 return NULL;
 466         }
 467
 468         DEBUG(4,(" session request ok\n"));
 469
 470         status = cli_negprot(c);
 471
 472         if (!NT_STATUS_IS_OK(status)) {
 473                 cli_shutdown(c);
 474                 errno = ETIMEDOUT;
 475                 return NULL;
 476         }
 477
 478         username_used = *pp_username;
 479
 480         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 481                                                *pp_password,
 482                                                strlen(*pp_password),
 483                                                *pp_password,
 484                                                strlen(*pp_password),
 485                                                *pp_workgroup))) {
 486
 487                 /* Failed.  Try an anonymous login, if allowed by flags. */
 488                 username_used = "";
 489
 490                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 491                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 492                                                        *pp_password, 1,
 493                                                        *pp_password, 0,
 494                                                        *pp_workgroup))) {
 495
 496                         cli_shutdown(c);
 497                         errno = EPERM;
 498                         return NULL;
 499                 }
 500         }
 501
 502         DEBUG(4,(" session setup ok\n"));
 503
 504         if (!cli_send_tconX(c, share, "?????",
 505                             *pp_password, strlen(*pp_password)+1)) {
 506                 errno = SMBC_errno(context, c);
 507                 cli_shutdown(c);
 508                 return NULL;
 509         }
 510
 511         DEBUG(4,(" tconx ok\n"));
 512
 513         /* Determine if this share supports case sensitivity */
 514         if (is_ipc) {
 515                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 516         } else if (!cli_get_fs_attr_info(c, &fs_attrs)) {
 517                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 518                           cli_errstr(c)));
 519
 520                 /*
 521                  * We can't determine the case sensitivity of the share. We
 522                  * have no choice but to use the user-specified case
 523                  * sensitivity setting.
 524                  */
 525                 if (smbc_getOptionCaseSensitive(context)) {
 526                         cli_set_case_sensitive(c, True);
 527                 } else {
 528                         cli_set_case_sensitive(c, False);
 529                 }
 530         } else {
 531                 DEBUG(4, ("Case sensitive: %s\n",
 532                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 533                            ? "True"
 534                            : "False")));
 535                 cli_set_case_sensitive(c,
 536                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 537                                         ? True
 538                                         : False));
 539         }
 540
 541         if (context->internal->smb_encryption_level) {
 542                 /* Attempt UNIX smb encryption. */
 543                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 544                                                           username_used,
 545                                                           *pp_password,
 546                                                           *pp_workgroup))) {
 547
 548                         /*
 549                          * context->smb_encryption_level == 1
 550                          * means don't fail if encryption can't be negotiated,
 551                          * == 2 means fail if encryption can't be negotiated.
 552                          */
 553
 554                         DEBUG(4,(" SMB encrypt failed\n"));
 555
 556                         if (context->internal->smb_encryption_level == 2) {
 557                                 cli_shutdown(c);
 558                                 errno = EPERM;
 559                                 return NULL;
 560                         }
 561                 }
 562                 DEBUG(4,(" SMB encrypt ok\n"));
 563         }
 564
 565         /*
 566          * Ok, we have got a nice connection
 567          * Let's allocate a server structure.
 568          */
 569
 570         srv = SMB_MALLOC_P(SMBCSRV);
 571         if (!srv) {
 572                 errno = ENOMEM;
 573                 goto failed;
 574         }
 575
 576         ZERO_STRUCTP(srv);
 577         srv->cli = c;
 578         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 579         srv->no_pathinfo = False;
 580         srv->no_pathinfo2 = False;
 581         srv->no_nt_session = False;
 582
 583         /* now add it to the cache (internal or external)  */
 584         /* Let the cache function set errno if it wants to */
 585         errno = 0;
 586         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 587                                                      server, share,
 588                                                      *pp_workgroup,
 589                                                      *pp_username)) {
 590                 int saved_errno = errno;
 591                 DEBUG(3, (" Failed to add server to cache\n"));
 592                 errno = saved_errno;
 593                 if (errno == 0) {
 594                         errno = ENOMEM;
 595                 }
 596                 goto failed;
 597         }
 598
 599         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 600                   server, share, srv));
 601
 602         DLIST_ADD(context->internal->servers, srv);
 603         return srv;
 604
 605 failed:
 606         cli_shutdown(c);
 607         if (!srv) {
 608                 return NULL;
 609         }
 610
 611         SAFE_FREE(srv);
 612         return NULL;
 613 }
 614
 615 /*
 616  * Connect to a server for getting/setting attributes, possibly on an existing
 617  * connection.  This works similarly to SMBC_server().
 618  */
 619 SMBCSRV *
 620 SMBC_attr_server(TALLOC_CTX *ctx,
 621                  SMBCCTX *context,
 622                  const char *server,
 623                  const char *share,
 624                  char **pp_workgroup,
 625                  char **pp_username,
 626                  char **pp_password)
 627 {
 628         int flags;
 629         struct sockaddr_storage ss;
 630         struct cli_state *ipc_cli;
 631         struct rpc_pipe_client *pipe_hnd;
 632         NTSTATUS nt_status;
 633         SMBCSRV *ipc_srv=NULL;
 634
 635         /*
 636          * See if we've already created this special connection.  Reference
 637          * our "special" share name '*IPC$', which is an impossible real share
 638          * name due to the leading asterisk.
 639          */
 640         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 641                                    pp_workgroup, pp_username, pp_password);
 642         if (!ipc_srv) {
 643
 644                 /* We didn't find a cached connection.  Get the password */
 645                 if (!*pp_password || (*pp_password)[0] == '\0') {
 646                         /* ... then retrieve it now. */
 647                         SMBC_call_auth_fn(ctx, context, server, share,
 648                                           pp_workgroup,
 649                                           pp_username,
 650                                           pp_password);
 651                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 652                                 errno = ENOMEM;
 653                                 return NULL;
 654                         }
 655                 }
 656
 657                 flags = 0;
 658                 if (smbc_getOptionUseKerberos(context)) {
 659                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 660                 }
 661
 662                 zero_sockaddr(&ss);
 663                 nt_status = cli_full_connection(&ipc_cli,
 664                                                 global_myname(), server,
 665                                                 &ss, 0, "IPC$", "?????",
 666                                                 *pp_username,
 667                                                 *pp_workgroup,
 668                                                 *pp_password,
 669                                                 flags,
 670                                                 Undefined, NULL);
 671                 if (! NT_STATUS_IS_OK(nt_status)) {
 672                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 673                                  nt_errstr(nt_status)));
 674                         errno = ENOTSUP;
 675                         return NULL;
 676                 }
 677
 678                 if (context->internal->smb_encryption_level) {
 679                         /* Attempt UNIX smb encryption. */
 680                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 681                                                                   *pp_username,
 682                                                                   *pp_password,
 683                                                                   *pp_workgroup))) {
 684
 685                                 /*
 686                                  * context->smb_encryption_level ==
 687                                  * 1 means don't fail if encryption can't be
 688                                  * negotiated, == 2 means fail if encryption
 689                                  * can't be negotiated.
 690                                  */
 691
 692                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 693
 694                                 if (context->internal->smb_encryption_level == 2) {
 695                                         cli_shutdown(ipc_cli);
 696                                         errno = EPERM;
 697                                         return NULL;
 698                                 }
 699                         }
 700                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 701                 }
 702
 703                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 704                 if (!ipc_srv) {
 705                         errno = ENOMEM;
 706                         cli_shutdown(ipc_cli);
 707                         return NULL;
 708                 }
 709
 710                 ZERO_STRUCTP(ipc_srv);
 711                 ipc_srv->cli = ipc_cli;
 712
 713                 nt_status = cli_rpc_pipe_open_noauth(
 714                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 715                 if (!NT_STATUS_IS_OK(nt_status)) {
 716                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 717                         errno = ENOTSUP;
 718                         cli_shutdown(ipc_srv->cli);
 719                         free(ipc_srv);
 720                         return NULL;
 721                 }
 722
 723                 /*
 724                  * Some systems don't support
 725                  * SEC_RIGHTS_MAXIMUM_ALLOWED, but NT sends 0x2000000
 726                  * so we might as well do it too.
 727                  */
 728
 729                 nt_status = rpccli_lsa_open_policy(
 730                         pipe_hnd,
 731                         talloc_tos(),
 732                         True,
 733                         GENERIC_EXECUTE_ACCESS,
 734                         &ipc_srv->pol);
 735
 736                 if (!NT_STATUS_IS_OK(nt_status)) {
 737                         errno = SMBC_errno(context, ipc_srv->cli);
 738                         cli_shutdown(ipc_srv->cli);
 739                         return NULL;
 740                 }
 741
 742                 /* now add it to the cache (internal or external) */
 743
 744                 errno = 0;      /* let cache function set errno if it likes */
 745                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 746                                                              server,
 747                                                              "*IPC$",
 748                                                              *pp_workgroup,
 749                                                              *pp_username)) {
 750                         DEBUG(3, (" Failed to add server to cache\n"));
 751                         if (errno == 0) {
 752                                 errno = ENOMEM;
 753                         }
 754                         cli_shutdown(ipc_srv->cli);
 755                         free(ipc_srv);
 756                         return NULL;
 757                 }
 758
 759                 DLIST_ADD(context->internal->servers, ipc_srv);
 760         }
 761
 762         return ipc_srv;
 763 }