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