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    Copyright (C) SATOH Fumiyasu <fumiyas@osstech.co.jp> 2009.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "libsmbclient.h"
  28 #include "libsmb_internal.h"
  29
  30
  31 /*
  32  * Check a server for being alive and well.
  33  * returns 0 if the server is in shape. Returns 1 on error
  34  *
  35  * Also useable outside libsmbclient to enable external cache
  36  * to do some checks too.
  37  */
  38 int
  39 SMBC_check_server(SMBCCTX * context,
  40                   SMBCSRV * server)
  41 {
  42         socklen_t size;
  43         struct sockaddr addr;
  44
  45         size = sizeof(addr);
  46         return (getpeername(server->cli->fd, &addr, &size) == -1);
  47 }
  48
  49 /*
  50  * Remove a server from the cached server list it's unused.
  51  * On success, 0 is returned. 1 is returned if the server could not be removed.
  52  *
  53  * Also useable outside libsmbclient
  54  */
  55 int
  56 SMBC_remove_unused_server(SMBCCTX * context,
  57                           SMBCSRV * srv)
  58 {
  59         SMBCFILE * file;
  60
  61         /* are we being fooled ? */
  62         if (!context || !context->internal->initialized || !srv) {
  63                 return 1;
  64         }
  65
  66         /* Check all open files/directories for a relation with this server */
  67         for (file = context->internal->files; file; file = file->next) {
  68                 if (file->srv == srv) {
  69                         /* Still used */
  70                         DEBUG(3, ("smbc_remove_usused_server: "
  71                                   "%p still used by %p.\n",
  72                                   srv, file));
  73                         return 1;
  74                 }
  75         }
  76
  77         DLIST_REMOVE(context->internal->servers, srv);
  78
  79         cli_shutdown(srv->cli);
  80         srv->cli = NULL;
  81
  82         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  83
  84         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  85
  86         SAFE_FREE(srv);
  87         return 0;
  88 }
  89
  90 /****************************************************************
  91  * Call the auth_fn with fixed size (fstring) buffers.
  92  ***************************************************************/
  93 void
  94 SMBC_call_auth_fn(TALLOC_CTX *ctx,
  95                   SMBCCTX *context,
  96                   const char *server,
  97                   const char *share,
  98                   char **pp_workgroup,
  99                   char **pp_username,
 100                   char **pp_password)
 101 {
 102         fstring workgroup;
 103         fstring username;
 104         fstring password;
 105         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 106
 107         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 108         strlcpy(username, *pp_username, sizeof(username));
 109         strlcpy(password, *pp_password, sizeof(password));
 110
 111         /* See if there's an authentication with context function provided */
 112         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 113         if (auth_with_context_fn)
 114         {
 115             (* auth_with_context_fn)(context,
 116                                      server, share,
 117                                      workgroup, sizeof(workgroup),
 118                                      username, sizeof(username),
 119                                      password, sizeof(password));
 120         }
 121         else
 122         {
 123             smbc_getFunctionAuthData(context)(server, share,
 124                                               workgroup, sizeof(workgroup),
 125                                               username, sizeof(username),
 126                                               password, sizeof(password));
 127         }
 128
 129         TALLOC_FREE(*pp_workgroup);
 130         TALLOC_FREE(*pp_username);
 131         TALLOC_FREE(*pp_password);
 132
 133         *pp_workgroup = talloc_strdup(ctx, workgroup);
 134         *pp_username = talloc_strdup(ctx, username);
 135         *pp_password = talloc_strdup(ctx, password);
 136 }
 137
 138
 139 void
 140 SMBC_get_auth_data(const char *server, const char *share,
 141                    char *workgroup_buf, int workgroup_buf_len,
 142                    char *username_buf, int username_buf_len,
 143                    char *password_buf, int password_buf_len)
 144 {
 145         /* Default function just uses provided data.  Nothing to do. */
 146 }
 147
 148
 149
 150 SMBCSRV *
 151 SMBC_find_server(TALLOC_CTX *ctx,
 152                  SMBCCTX *context,
 153                  const char *server,
 154                  const char *share,
 155                  char **pp_workgroup,
 156                  char **pp_username,
 157                  char **pp_password)
 158 {
 159         SMBCSRV *srv;
 160         int auth_called = 0;
 161
 162         if (!pp_workgroup || !pp_username || !pp_password) {
 163                 return NULL;
 164         }
 165
 166 check_server_cache:
 167
 168         srv = smbc_getFunctionGetCachedServer(context)(context,
 169                                                        server, share,
 170                                                        *pp_workgroup,
 171                                                        *pp_username);
 172
 173         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 174                                      !*pp_password || !(*pp_password)[0])) {
 175                 SMBC_call_auth_fn(ctx, context, server, share,
 176                                   pp_workgroup, pp_username, pp_password);
 177
 178                 /*
 179                  * However, smbc_auth_fn may have picked up info relating to
 180                  * an existing connection, so try for an existing connection
 181                  * again ...
 182                  */
 183                 auth_called = 1;
 184                 goto check_server_cache;
 185
 186         }
 187
 188         if (srv) {
 189                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 190                         /*
 191                          * This server is no good anymore
 192                          * Try to remove it and check for more possible
 193                          * servers in the cache
 194                          */
 195                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 196                                                                         srv)) {
 197                                 /*
 198                                  * We could not remove the server completely,
 199                                  * remove it from the cache so we will not get
 200                                  * it again. It will be removed when the last
 201                                  * file/dir is closed.
 202                                  */
 203                                 smbc_getFunctionRemoveCachedServer(context)(context,
 204                                                                             srv);
 205                         }
 206
 207                         /*
 208                          * Maybe there are more cached connections to this
 209                          * server
 210                          */
 211                         goto check_server_cache;
 212                 }
 213
 214                 return srv;
 215         }
 216
 217         return NULL;
 218 }
 219
 220 /*
 221  * Connect to a server, possibly on an existing connection
 222  *
 223  * Here, what we want to do is: If the server and username
 224  * match an existing connection, reuse that, otherwise, establish a
 225  * new connection.
 226  *
 227  * If we have to create a new connection, call the auth_fn to get the
 228  * info we need, unless the username and password were passed in.
 229  */
 230
 231 static SMBCSRV *
 232 SMBC_server_internal(TALLOC_CTX *ctx,
 233             SMBCCTX *context,
 234             bool connect_if_not_found,
 235             const char *server,
 236             const char *share,
 237             char **pp_workgroup,
 238             char **pp_username,
 239             char **pp_password,
 240             bool *in_cache)
 241 {
 242         SMBCSRV *srv=NULL;
 243         char *workgroup = NULL;
 244         struct cli_state *c;
 245         struct nmb_name called, calling;
 246         const char *server_n = server;
 247         struct sockaddr_storage ss;
 248         int tried_reverse = 0;
 249         int port_try_first;
 250         int port_try_next;
 251         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 252         uint32 fs_attrs = 0;
 253         const char *username_used;
 254         NTSTATUS status;
 255         char *newserver, *newshare;
 256
 257         zero_sockaddr(&ss);
 258         ZERO_STRUCT(c);
 259         *in_cache = false;
 260
 261         if (server[0] == 0) {
 262                 errno = EPERM;
 263                 return NULL;
 264         }
 265
 266         /* Look for a cached connection */
 267         srv = SMBC_find_server(ctx, context, server, share,
 268                                pp_workgroup, pp_username, pp_password);
 269
 270         /*
 271          * If we found a connection and we're only allowed one share per
 272          * server...
 273          */
 274         if (srv &&
 275             *share != '\0' &&
 276             smbc_getOptionOneSharePerServer(context)) {
 277
 278                 /*
 279                  * ... then if there's no current connection to the share,
 280                  * connect to it.  SMBC_find_server(), or rather the function
 281                  * pointed to by context->get_cached_srv_fn which
 282                  * was called by SMBC_find_server(), will have issued a tree
 283                  * disconnect if the requested share is not the same as the
 284                  * one that was already connected.
 285                  */
 286
 287                 /*
 288                  * Use srv->cli->desthost and srv->cli->share instead of
 289                  * server and share below to connect to the actual share,
 290                  * i.e., a normal share or a referred share from
 291                  * 'msdfs proxy' share.
 292                  */
 293                 if (srv->cli->cnum == (uint16) -1) {
 294                         /* Ensure we have accurate auth info */
 295                         SMBC_call_auth_fn(ctx, context,
 296                                           srv->cli->desthost,
 297                                           srv->cli->share,
 298                                           pp_workgroup,
 299                                           pp_username,
 300                                           pp_password);
 301
 302                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 303                                 errno = ENOMEM;
 304                                 cli_shutdown(srv->cli);
 305                                 srv->cli = NULL;
 306                                 smbc_getFunctionRemoveCachedServer(context)(context,
 307                                                                             srv);
 308                                 return NULL;
 309                         }
 310
 311                         /*
 312                          * We don't need to renegotiate encryption
 313                          * here as the encryption context is not per
 314                          * tid.
 315                          */
 316
 317                         status = cli_tcon_andx(srv->cli, srv->cli->share, "?????",
 318                                                *pp_password,
 319                                                strlen(*pp_password)+1);
 320                         if (!NT_STATUS_IS_OK(status)) {
 321                                 errno = map_errno_from_nt_status(status);
 322                                 cli_shutdown(srv->cli);
 323                                 srv->cli = NULL;
 324                                 smbc_getFunctionRemoveCachedServer(context)(context,
 325                                                                             srv);
 326                                 srv = NULL;
 327                         }
 328
 329                         /* Determine if this share supports case sensitivity */
 330                         if (is_ipc) {
 331                                 DEBUG(4,
 332                                       ("IPC$ so ignore case sensitivity\n"));
 333                         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 334                                 DEBUG(4, ("Could not retrieve "
 335                                           "case sensitivity flag: %s.\n",
 336                                           cli_errstr(c)));
 337
 338                                 /*
 339                                  * We can't determine the case sensitivity of
 340                                  * the share. We have no choice but to use the
 341                                  * user-specified case sensitivity setting.
 342                                  */
 343                                 if (smbc_getOptionCaseSensitive(context)) {
 344                                         cli_set_case_sensitive(c, True);
 345                                 } else {
 346                                         cli_set_case_sensitive(c, False);
 347                                 }
 348                         } else {
 349                                 DEBUG(4,
 350                                       ("Case sensitive: %s\n",
 351                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 352                                         ? "True"
 353                                         : "False")));
 354                                 cli_set_case_sensitive(
 355                                         c,
 356                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 357                                          ? True
 358                                          : False));
 359                         }
 360
 361                         /*
 362                          * Regenerate the dev value since it's based on both
 363                          * server and share
 364                          */
 365                         if (srv) {
 366                                 srv->dev = (dev_t)(str_checksum(srv->cli->desthost) ^
 367                                                    str_checksum(srv->cli->share));
 368                         }
 369                 }
 370         }
 371
 372         /* If we have a connection... */
 373         if (srv) {
 374
 375                 /* ... then we're done here.  Give 'em what they came for. */
 376                 *in_cache = true;
 377                 goto done;
 378         }
 379
 380         /* If we're not asked to connect when a connection doesn't exist... */
 381         if (! connect_if_not_found) {
 382                 /* ... then we're done here. */
 383                 return NULL;
 384         }
 385
 386         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 387                 errno = ENOMEM;
 388                 return NULL;
 389         }
 390
 391         make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
 392         make_nmb_name(&called , server, 0x20);
 393
 394         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 395
 396         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 397
 398 again:
 399
 400         zero_sockaddr(&ss);
 401
 402         /* have to open a new connection */
 403         if ((c = cli_initialise()) == NULL) {
 404                 errno = ENOMEM;
 405                 return NULL;
 406         }
 407
 408         if (smbc_getOptionUseKerberos(context)) {
 409                 c->use_kerberos = True;
 410         }
 411
 412         if (smbc_getOptionFallbackAfterKerberos(context)) {
 413                 c->fallback_after_kerberos = True;
 414         }
 415
 416         c->timeout = smbc_getTimeout(context);
 417
 418         /*
 419          * Force use of port 139 for first try if share is $IPC, empty, or
 420          * null, so browse lists can work
 421          */
 422         if (share == NULL || *share == '\0' || is_ipc) {
 423                 port_try_first = 139;
 424                 port_try_next = 445;
 425         } else {
 426                 port_try_first = 445;
 427                 port_try_next = 139;
 428         }
 429
 430         c->port = port_try_first;
 431
 432         status = cli_connect(c, server_n, &ss);
 433         if (!NT_STATUS_IS_OK(status)) {
 434
 435                 /* First connection attempt failed.  Try alternate port. */
 436                 c->port = port_try_next;
 437
 438                 status = cli_connect(c, server_n, &ss);
 439                 if (!NT_STATUS_IS_OK(status)) {
 440                         cli_shutdown(c);
 441                         errno = ETIMEDOUT;
 442                         return NULL;
 443                 }
 444         }
 445
 446         if (!cli_session_request(c, &calling, &called)) {
 447                 cli_shutdown(c);
 448                 if (strcmp(called.name, "*SMBSERVER")) {
 449                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 450                         goto again;
 451                 } else {  /* Try one more time, but ensure we don't loop */
 452
 453                         /* Only try this if server is an IP address ... */
 454
 455                         if (is_ipaddress(server) && !tried_reverse) {
 456                                 fstring remote_name;
 457                                 struct sockaddr_storage rem_ss;
 458
 459                                 if (!interpret_string_addr(&rem_ss, server,
 460                                                            NI_NUMERICHOST)) {
 461                                         DEBUG(4, ("Could not convert IP address "
 462                                                   "%s to struct sockaddr_storage\n",
 463                                                   server));
 464                                         errno = ETIMEDOUT;
 465                                         return NULL;
 466                                 }
 467
 468                                 tried_reverse++; /* Yuck */
 469
 470                                 if (name_status_find("*", 0, 0,
 471                                                      &rem_ss, remote_name)) {
 472                                         make_nmb_name(&called,
 473                                                       remote_name,
 474                                                       0x20);
 475                                         goto again;
 476                                 }
 477                         }
 478                 }
 479                 errno = ETIMEDOUT;
 480                 return NULL;
 481         }
 482
 483         DEBUG(4,(" session request ok\n"));
 484
 485         status = cli_negprot(c);
 486
 487         if (!NT_STATUS_IS_OK(status)) {
 488                 cli_shutdown(c);
 489                 errno = ETIMEDOUT;
 490                 return NULL;
 491         }
 492
 493         username_used = *pp_username;
 494
 495         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 496                                                *pp_password,
 497                                                strlen(*pp_password),
 498                                                *pp_password,
 499                                                strlen(*pp_password),
 500                                                *pp_workgroup))) {
 501
 502                 /* Failed.  Try an anonymous login, if allowed by flags. */
 503                 username_used = "";
 504
 505                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 506                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 507                                                        *pp_password, 1,
 508                                                        *pp_password, 0,
 509                                                        *pp_workgroup))) {
 510
 511                         cli_shutdown(c);
 512                         errno = EPERM;
 513                         return NULL;
 514                 }
 515         }
 516
 517         status = cli_init_creds(c, username_used,
 518                                 *pp_workgroup, *pp_password);
 519         if (!NT_STATUS_IS_OK(status)) {
 520                 errno = map_errno_from_nt_status(status);
 521                 cli_shutdown(c);
 522                 return NULL;
 523         }
 524
 525         DEBUG(4,(" session setup ok\n"));
 526
 527         /* here's the fun part....to support 'msdfs proxy' shares
 528            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 529            here before trying to connect to the original share.
 530            cli_check_msdfs_proxy() will fail if it is a normal share. */
 531
 532         if ((c->capabilities & CAP_DFS) &&
 533                         cli_check_msdfs_proxy(ctx, c, share,
 534                                 &newserver, &newshare,
 535                                 /* FIXME: cli_check_msdfs_proxy() does
 536                                    not support smbc_smb_encrypt_level type */
 537                                 context->internal->smb_encryption_level ?
 538                                         true : false,
 539                                 *pp_username,
 540                                 *pp_password,
 541                                 *pp_workgroup)) {
 542                 cli_shutdown(c);
 543                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 544                                 newserver, newshare, pp_workgroup,
 545                                 pp_username, pp_password, in_cache);
 546                 TALLOC_FREE(newserver);
 547                 TALLOC_FREE(newshare);
 548                 return srv;
 549         }
 550
 551         /* must be a normal share */
 552
 553         status = cli_tcon_andx(c, share, "?????", *pp_password,
 554                                strlen(*pp_password)+1);
 555         if (!NT_STATUS_IS_OK(status)) {
 556                 errno = map_errno_from_nt_status(status);
 557                 cli_shutdown(c);
 558                 return NULL;
 559         }
 560
 561         DEBUG(4,(" tconx ok\n"));
 562
 563         /* Determine if this share supports case sensitivity */
 564         if (is_ipc) {
 565                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 566         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 567                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 568                           cli_errstr(c)));
 569
 570                 /*
 571                  * We can't determine the case sensitivity of the share. We
 572                  * have no choice but to use the user-specified case
 573                  * sensitivity setting.
 574                  */
 575                 if (smbc_getOptionCaseSensitive(context)) {
 576                         cli_set_case_sensitive(c, True);
 577                 } else {
 578                         cli_set_case_sensitive(c, False);
 579                 }
 580         } else {
 581                 DEBUG(4, ("Case sensitive: %s\n",
 582                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 583                            ? "True"
 584                            : "False")));
 585                 cli_set_case_sensitive(c,
 586                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 587                                         ? True
 588                                         : False));
 589         }
 590
 591         if (context->internal->smb_encryption_level) {
 592                 /* Attempt UNIX smb encryption. */
 593                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 594                                                           username_used,
 595                                                           *pp_password,
 596                                                           *pp_workgroup))) {
 597
 598                         /*
 599                          * context->smb_encryption_level == 1
 600                          * means don't fail if encryption can't be negotiated,
 601                          * == 2 means fail if encryption can't be negotiated.
 602                          */
 603
 604                         DEBUG(4,(" SMB encrypt failed\n"));
 605
 606                         if (context->internal->smb_encryption_level == 2) {
 607                                 cli_shutdown(c);
 608                                 errno = EPERM;
 609                                 return NULL;
 610                         }
 611                 }
 612                 DEBUG(4,(" SMB encrypt ok\n"));
 613         }
 614
 615         /*
 616          * Ok, we have got a nice connection
 617          * Let's allocate a server structure.
 618          */
 619
 620         srv = SMB_MALLOC_P(SMBCSRV);
 621         if (!srv) {
 622                 cli_shutdown(c);
 623                 errno = ENOMEM;
 624                 return NULL;
 625         }
 626
 627         ZERO_STRUCTP(srv);
 628         srv->cli = c;
 629         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 630         srv->no_pathinfo = False;
 631         srv->no_pathinfo2 = False;
 632         srv->no_nt_session = False;
 633
 634 done:
 635         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 636                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 637         } else {
 638                 workgroup = *pp_workgroup;
 639         }
 640         if(!workgroup) {
 641                 return NULL;
 642         }
 643
 644         /* set the credentials to make DFS work */
 645         smbc_set_credentials_with_fallback(context,
 646                                            workgroup,
 647                                            *pp_username,
 648                                            *pp_password);
 649
 650         return srv;
 651 }
 652
 653 SMBCSRV *
 654 SMBC_server(TALLOC_CTX *ctx,
 655                 SMBCCTX *context,
 656                 bool connect_if_not_found,
 657                 const char *server,
 658                 const char *share,
 659                 char **pp_workgroup,
 660                 char **pp_username,
 661                 char **pp_password)
 662 {
 663         SMBCSRV *srv=NULL;
 664         bool in_cache = false;
 665
 666         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 667                         server, share, pp_workgroup,
 668                         pp_username, pp_password, &in_cache);
 669
 670         if (!srv) {
 671                 return NULL;
 672         }
 673         if (in_cache) {
 674                 return srv;
 675         }
 676
 677         /* Now add it to the cache (internal or external)  */
 678         /* Let the cache function set errno if it wants to */
 679         errno = 0;
 680         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 681                                                 server, share,
 682                                                 *pp_workgroup,
 683                                                 *pp_username)) {
 684                 int saved_errno = errno;
 685                 DEBUG(3, (" Failed to add server to cache\n"));
 686                 errno = saved_errno;
 687                 if (errno == 0) {
 688                         errno = ENOMEM;
 689                 }
 690                 SAFE_FREE(srv);
 691                 return NULL;
 692         }
 693
 694         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 695                 server, share, srv));
 696
 697         DLIST_ADD(context->internal->servers, srv);
 698         return srv;
 699 }
 700
 701 /*
 702  * Connect to a server for getting/setting attributes, possibly on an existing
 703  * connection.  This works similarly to SMBC_server().
 704  */
 705 SMBCSRV *
 706 SMBC_attr_server(TALLOC_CTX *ctx,
 707                  SMBCCTX *context,
 708                  const char *server,
 709                  const char *share,
 710                  char **pp_workgroup,
 711                  char **pp_username,
 712                  char **pp_password)
 713 {
 714         int flags;
 715         struct sockaddr_storage ss;
 716         struct cli_state *ipc_cli = NULL;
 717         struct rpc_pipe_client *pipe_hnd = NULL;
 718         NTSTATUS nt_status;
 719         SMBCSRV *srv=NULL;
 720         SMBCSRV *ipc_srv=NULL;
 721
 722         /*
 723          * Use srv->cli->desthost and srv->cli->share instead of
 724          * server and share below to connect to the actual share,
 725          * i.e., a normal share or a referred share from
 726          * 'msdfs proxy' share.
 727          */
 728         srv = SMBC_server(ctx, context, true, server, share,
 729                         pp_workgroup, pp_username, pp_password);
 730         if (!srv) {
 731                 return NULL;
 732         }
 733         server = srv->cli->desthost;
 734         share = srv->cli->share;
 735
 736         /*
 737          * See if we've already created this special connection.  Reference
 738          * our "special" share name '*IPC$', which is an impossible real share
 739          * name due to the leading asterisk.
 740          */
 741         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 742                                    pp_workgroup, pp_username, pp_password);
 743         if (!ipc_srv) {
 744
 745                 /* We didn't find a cached connection.  Get the password */
 746                 if (!*pp_password || (*pp_password)[0] == '\0') {
 747                         /* ... then retrieve it now. */
 748                         SMBC_call_auth_fn(ctx, context, server, share,
 749                                           pp_workgroup,
 750                                           pp_username,
 751                                           pp_password);
 752                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 753                                 errno = ENOMEM;
 754                                 return NULL;
 755                         }
 756                 }
 757
 758                 flags = 0;
 759                 if (smbc_getOptionUseKerberos(context)) {
 760                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 761                 }
 762
 763                 zero_sockaddr(&ss);
 764                 nt_status = cli_full_connection(&ipc_cli,
 765                                                 global_myname(), server,
 766                                                 &ss, 0, "IPC$", "?????",
 767                                                 *pp_username,
 768                                                 *pp_workgroup,
 769                                                 *pp_password,
 770                                                 flags,
 771                                                 Undefined, NULL);
 772                 if (! NT_STATUS_IS_OK(nt_status)) {
 773                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 774                                  nt_errstr(nt_status)));
 775                         errno = ENOTSUP;
 776                         return NULL;
 777                 }
 778
 779                 if (context->internal->smb_encryption_level) {
 780                         /* Attempt UNIX smb encryption. */
 781                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 782                                                                   *pp_username,
 783                                                                   *pp_password,
 784                                                                   *pp_workgroup))) {
 785
 786                                 /*
 787                                  * context->smb_encryption_level ==
 788                                  * 1 means don't fail if encryption can't be
 789                                  * negotiated, == 2 means fail if encryption
 790                                  * can't be negotiated.
 791                                  */
 792
 793                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 794
 795                                 if (context->internal->smb_encryption_level == 2) {
 796                                         cli_shutdown(ipc_cli);
 797                                         errno = EPERM;
 798                                         return NULL;
 799                                 }
 800                         }
 801                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 802                 }
 803
 804                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 805                 if (!ipc_srv) {
 806                         errno = ENOMEM;
 807                         cli_shutdown(ipc_cli);
 808                         return NULL;
 809                 }
 810
 811                 ZERO_STRUCTP(ipc_srv);
 812                 ipc_srv->cli = ipc_cli;
 813
 814                 nt_status = cli_rpc_pipe_open_noauth(
 815                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 816                 if (!NT_STATUS_IS_OK(nt_status)) {
 817                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 818                         errno = ENOTSUP;
 819                         cli_shutdown(ipc_srv->cli);
 820                         free(ipc_srv);
 821                         return NULL;
 822                 }
 823
 824                 /*
 825                  * Some systems don't support
 826                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 827                  * so we might as well do it too.
 828                  */
 829
 830                 nt_status = rpccli_lsa_open_policy(
 831                         pipe_hnd,
 832                         talloc_tos(),
 833                         True,
 834                         GENERIC_EXECUTE_ACCESS,
 835                         &ipc_srv->pol);
 836
 837                 if (!NT_STATUS_IS_OK(nt_status)) {
 838                         errno = SMBC_errno(context, ipc_srv->cli);
 839                         cli_shutdown(ipc_srv->cli);
 840                         return NULL;
 841                 }
 842
 843                 /* now add it to the cache (internal or external) */
 844
 845                 errno = 0;      /* let cache function set errno if it likes */
 846                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 847                                                              server,
 848                                                              "*IPC$",
 849                                                              *pp_workgroup,
 850                                                              *pp_username)) {
 851                         DEBUG(3, (" Failed to add server to cache\n"));
 852                         if (errno == 0) {
 853                                 errno = ENOMEM;
 854                         }
 855                         cli_shutdown(ipc_srv->cli);
 856                         free(ipc_srv);
 857                         return NULL;
 858                 }
 859
 860                 DLIST_ADD(context->internal->servers, ipc_srv);
 861         }
 862
 863         return ipc_srv;
 864 }