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 #include "../libcli/smb/smbXcli_base.h"
  36
  37 /*
  38  * Check a server for being alive and well.
  39  * returns 0 if the server is in shape. Returns 1 on error
  40  *
  41  * Also useable outside libsmbclient to enable external cache
  42  * to do some checks too.
  43  */
  44 int
  45 SMBC_check_server(SMBCCTX * context,
  46                   SMBCSRV * server)
  47 {
  48         if (!cli_state_is_connected(server->cli)) {
  49                 return 1;
  50         }
  51
  52         return 0;
  53 }
  54
  55 /*
  56  * Remove a server from the cached server list it's unused.
  57  * On success, 0 is returned. 1 is returned if the server could not be removed.
  58  *
  59  * Also useable outside libsmbclient
  60  */
  61 int
  62 SMBC_remove_unused_server(SMBCCTX * context,
  63                           SMBCSRV * srv)
  64 {
  65         SMBCFILE * file;
  66
  67         /* are we being fooled ? */
  68         if (!context || !context->internal->initialized || !srv) {
  69                 return 1;
  70         }
  71
  72         /* Check all open files/directories for a relation with this server */
  73         for (file = context->internal->files; file; file = file->next) {
  74                 if (file->srv == srv) {
  75                         /* Still used */
  76                         DEBUG(3, ("smbc_remove_usused_server: "
  77                                   "%p still used by %p.\n",
  78                                   srv, file));
  79                         return 1;
  80                 }
  81         }
  82
  83         DLIST_REMOVE(context->internal->servers, srv);
  84
  85         cli_shutdown(srv->cli);
  86         srv->cli = NULL;
  87
  88         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  89
  90         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  91
  92         SAFE_FREE(srv);
  93         return 0;
  94 }
  95
  96 /****************************************************************
  97  * Call the auth_fn with fixed size (fstring) buffers.
  98  ***************************************************************/
  99 static void
 100 SMBC_call_auth_fn(TALLOC_CTX *ctx,
 101                   SMBCCTX *context,
 102                   const char *server,
 103                   const char *share,
 104                   char **pp_workgroup,
 105                   char **pp_username,
 106                   char **pp_password)
 107 {
 108         fstring workgroup;
 109         fstring username;
 110         fstring password;
 111         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 112
 113         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 114         strlcpy(username, *pp_username, sizeof(username));
 115         strlcpy(password, *pp_password, sizeof(password));
 116
 117         /* See if there's an authentication with context function provided */
 118         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 119         if (auth_with_context_fn)
 120         {
 121             (* auth_with_context_fn)(context,
 122                                      server, share,
 123                                      workgroup, sizeof(workgroup),
 124                                      username, sizeof(username),
 125                                      password, sizeof(password));
 126         }
 127         else
 128         {
 129             smbc_getFunctionAuthData(context)(server, share,
 130                                               workgroup, sizeof(workgroup),
 131                                               username, sizeof(username),
 132                                               password, sizeof(password));
 133         }
 134
 135         TALLOC_FREE(*pp_workgroup);
 136         TALLOC_FREE(*pp_username);
 137         TALLOC_FREE(*pp_password);
 138
 139         *pp_workgroup = talloc_strdup(ctx, workgroup);
 140         *pp_username = talloc_strdup(ctx, username);
 141         *pp_password = talloc_strdup(ctx, password);
 142 }
 143
 144
 145 void
 146 SMBC_get_auth_data(const char *server, const char *share,
 147                    char *workgroup_buf, int workgroup_buf_len,
 148                    char *username_buf, int username_buf_len,
 149                    char *password_buf, int password_buf_len)
 150 {
 151         /* Default function just uses provided data.  Nothing to do. */
 152 }
 153
 154
 155
 156 SMBCSRV *
 157 SMBC_find_server(TALLOC_CTX *ctx,
 158                  SMBCCTX *context,
 159                  const char *server,
 160                  const char *share,
 161                  char **pp_workgroup,
 162                  char **pp_username,
 163                  char **pp_password)
 164 {
 165         SMBCSRV *srv;
 166         int auth_called = 0;
 167
 168         if (!pp_workgroup || !pp_username || !pp_password) {
 169                 return NULL;
 170         }
 171
 172 check_server_cache:
 173
 174         srv = smbc_getFunctionGetCachedServer(context)(context,
 175                                                        server, share,
 176                                                        *pp_workgroup,
 177                                                        *pp_username);
 178
 179         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 180                                      !*pp_password || !(*pp_password)[0])) {
 181                 SMBC_call_auth_fn(ctx, context, server, share,
 182                                   pp_workgroup, pp_username, pp_password);
 183
 184                 /*
 185                  * However, smbc_auth_fn may have picked up info relating to
 186                  * an existing connection, so try for an existing connection
 187                  * again ...
 188                  */
 189                 auth_called = 1;
 190                 goto check_server_cache;
 191
 192         }
 193
 194         if (srv) {
 195                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 196                         /*
 197                          * This server is no good anymore
 198                          * Try to remove it and check for more possible
 199                          * servers in the cache
 200                          */
 201                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 202                                                                         srv)) {
 203                                 /*
 204                                  * We could not remove the server completely,
 205                                  * remove it from the cache so we will not get
 206                                  * it again. It will be removed when the last
 207                                  * file/dir is closed.
 208                                  */
 209                                 smbc_getFunctionRemoveCachedServer(context)(context,
 210                                                                             srv);
 211                         }
 212
 213                         /*
 214                          * Maybe there are more cached connections to this
 215                          * server
 216                          */
 217                         goto check_server_cache;
 218                 }
 219
 220                 return srv;
 221         }
 222
 223         return NULL;
 224 }
 225
 226 /*
 227  * Connect to a server, possibly on an existing connection
 228  *
 229  * Here, what we want to do is: If the server and username
 230  * match an existing connection, reuse that, otherwise, establish a
 231  * new connection.
 232  *
 233  * If we have to create a new connection, call the auth_fn to get the
 234  * info we need, unless the username and password were passed in.
 235  */
 236
 237 static SMBCSRV *
 238 SMBC_server_internal(TALLOC_CTX *ctx,
 239             SMBCCTX *context,
 240             bool connect_if_not_found,
 241             const char *server,
 242             const char *share,
 243             char **pp_workgroup,
 244             char **pp_username,
 245             char **pp_password,
 246             bool *in_cache)
 247 {
 248         SMBCSRV *srv=NULL;
 249         char *workgroup = NULL;
 250         struct cli_state *c = NULL;
 251         const char *server_n = server;
 252         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 253         uint32 fs_attrs = 0;
 254         const char *username_used;
 255         NTSTATUS status;
 256         char *newserver, *newshare;
 257         int flags = 0;
 258
 259         ZERO_STRUCT(c);
 260         *in_cache = false;
 261
 262         if (server[0] == 0) {
 263                 errno = EPERM;
 264                 return NULL;
 265         }
 266
 267         /* Look for a cached connection */
 268         srv = SMBC_find_server(ctx, context, server, share,
 269                                pp_workgroup, pp_username, pp_password);
 270
 271         /*
 272          * If we found a connection and we're only allowed one share per
 273          * server...
 274          */
 275         if (srv &&
 276             share != NULL && *share != '\0' &&
 277             smbc_getOptionOneSharePerServer(context)) {
 278
 279                 /*
 280                  * ... then if there's no current connection to the share,
 281                  * connect to it.  SMBC_find_server(), or rather the function
 282                  * pointed to by context->get_cached_srv_fn which
 283                  * was called by SMBC_find_server(), will have issued a tree
 284                  * disconnect if the requested share is not the same as the
 285                  * one that was already connected.
 286                  */
 287
 288                 /*
 289                  * Use srv->cli->desthost and srv->cli->share instead of
 290                  * server and share below to connect to the actual share,
 291                  * i.e., a normal share or a referred share from
 292                  * 'msdfs proxy' share.
 293                  */
 294                 if (!cli_state_has_tcon(srv->cli)) {
 295                         /* Ensure we have accurate auth info */
 296                         SMBC_call_auth_fn(ctx, context,
 297                                           smbXcli_conn_remote_name(srv->cli->conn),
 298                                           srv->cli->share,
 299                                           pp_workgroup,
 300                                           pp_username,
 301                                           pp_password);
 302
 303                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 304                                 errno = ENOMEM;
 305                                 cli_shutdown(srv->cli);
 306                                 srv->cli = NULL;
 307                                 smbc_getFunctionRemoveCachedServer(context)(context,
 308                                                                             srv);
 309                                 return NULL;
 310                         }
 311
 312                         /*
 313                          * We don't need to renegotiate encryption
 314                          * here as the encryption context is not per
 315                          * tid.
 316                          */
 317
 318                         status = cli_tree_connect(srv->cli,
 319                                                   srv->cli->share,
 320                                                   "?????",
 321                                                   *pp_password,
 322                                                   strlen(*pp_password)+1);
 323                         if (!NT_STATUS_IS_OK(status)) {
 324                                 errno = map_errno_from_nt_status(status);
 325                                 cli_shutdown(srv->cli);
 326                                 srv->cli = NULL;
 327                                 smbc_getFunctionRemoveCachedServer(context)(context,
 328                                                                             srv);
 329                                 srv = NULL;
 330                         }
 331
 332                         /* Determine if this share supports case sensitivity */
 333                         if (is_ipc) {
 334                                 DEBUG(4,
 335                                       ("IPC$ so ignore case sensitivity\n"));
 336                                 status = NT_STATUS_OK;
 337                         } else {
 338                                 status = cli_get_fs_attr_info(c, &fs_attrs);
 339                         }
 340
 341                         if (!NT_STATUS_IS_OK(status)) {
 342                                 DEBUG(4, ("Could not retrieve "
 343                                           "case sensitivity flag: %s.\n",
 344                                           nt_errstr(status)));
 345
 346                                 /*
 347                                  * We can't determine the case sensitivity of
 348                                  * the share. We have no choice but to use the
 349                                  * user-specified case sensitivity setting.
 350                                  */
 351                                 if (smbc_getOptionCaseSensitive(context)) {
 352                                         cli_set_case_sensitive(c, True);
 353                                 } else {
 354                                         cli_set_case_sensitive(c, False);
 355                                 }
 356                         } else if (!is_ipc) {
 357                                 DEBUG(4,
 358                                       ("Case sensitive: %s\n",
 359                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 360                                         ? "True"
 361                                         : "False")));
 362                                 cli_set_case_sensitive(
 363                                         c,
 364                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 365                                          ? True
 366                                          : False));
 367                         }
 368
 369                         /*
 370                          * Regenerate the dev value since it's based on both
 371                          * server and share
 372                          */
 373                         if (srv) {
 374                                 const char *remote_name =
 375                                         smbXcli_conn_remote_name(srv->cli->conn);
 376
 377                                 srv->dev = (dev_t)(str_checksum(remote_name) ^
 378                                                    str_checksum(srv->cli->share));
 379                         }
 380                 }
 381         }
 382
 383         /* If we have a connection... */
 384         if (srv) {
 385
 386                 /* ... then we're done here.  Give 'em what they came for. */
 387                 *in_cache = true;
 388                 goto done;
 389         }
 390
 391         /* If we're not asked to connect when a connection doesn't exist... */
 392         if (! connect_if_not_found) {
 393                 /* ... then we're done here. */
 394                 return NULL;
 395         }
 396
 397         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 398                 errno = ENOMEM;
 399                 return NULL;
 400         }
 401
 402         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 403
 404         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 405
 406         status = NT_STATUS_UNSUCCESSFUL;
 407
 408         if (smbc_getOptionUseKerberos(context)) {
 409                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 410         }
 411
 412         if (smbc_getOptionFallbackAfterKerberos(context)) {
 413                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 414         }
 415
 416         if (smbc_getOptionUseCCache(context)) {
 417                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 418         }
 419
 420         if (smbc_getOptionUseNTHash(context)) {
 421                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 422         }
 423
 424         if (share == NULL || *share == '\0' || is_ipc) {
 425                 /*
 426                  * Try 139 first for IPC$
 427                  */
 428                 status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
 429                                         smbc_getNetbiosName(context),
 430                                         SMB_SIGNING_DEFAULT, flags, &c);
 431         }
 432
 433         if (!NT_STATUS_IS_OK(status)) {
 434                 /*
 435                  * No IPC$ or 139 did not work
 436                  */
 437                 status = cli_connect_nb(server_n, NULL, 0, 0x20,
 438                                         smbc_getNetbiosName(context),
 439                                         SMB_SIGNING_DEFAULT, flags, &c);
 440         }
 441
 442         if (!NT_STATUS_IS_OK(status)) {
 443                 errno = map_errno_from_nt_status(status);
 444                 return NULL;
 445         }
 446
 447         cli_set_timeout(c, smbc_getTimeout(context));
 448
 449         status = smbXcli_negprot(c->conn, c->timeout, PROTOCOL_CORE,
 450                                  PROTOCOL_NT1);
 451
 452         if (!NT_STATUS_IS_OK(status)) {
 453                 cli_shutdown(c);
 454                 errno = ETIMEDOUT;
 455                 return NULL;
 456         }
 457
 458         username_used = *pp_username;
 459
 460         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 461                                                *pp_password,
 462                                                strlen(*pp_password),
 463                                                *pp_password,
 464                                                strlen(*pp_password),
 465                                                *pp_workgroup))) {
 466
 467                 /* Failed.  Try an anonymous login, if allowed by flags. */
 468                 username_used = "";
 469
 470                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 471                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 472                                                        *pp_password, 1,
 473                                                        *pp_password, 0,
 474                                                        *pp_workgroup))) {
 475
 476                         cli_shutdown(c);
 477                         errno = EPERM;
 478                         return NULL;
 479                 }
 480         }
 481
 482         status = cli_init_creds(c, username_used,
 483                                 *pp_workgroup, *pp_password);
 484         if (!NT_STATUS_IS_OK(status)) {
 485                 errno = map_errno_from_nt_status(status);
 486                 cli_shutdown(c);
 487                 return NULL;
 488         }
 489
 490         DEBUG(4,(" session setup ok\n"));
 491
 492         /* here's the fun part....to support 'msdfs proxy' shares
 493            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 494            here before trying to connect to the original share.
 495            cli_check_msdfs_proxy() will fail if it is a normal share. */
 496
 497         if ((smb1cli_conn_capabilities(c->conn) & CAP_DFS) &&
 498                         cli_check_msdfs_proxy(ctx, c, share,
 499                                 &newserver, &newshare,
 500                                 /* FIXME: cli_check_msdfs_proxy() does
 501                                    not support smbc_smb_encrypt_level type */
 502                                 context->internal->smb_encryption_level ?
 503                                         true : false,
 504                                 *pp_username,
 505                                 *pp_password,
 506                                 *pp_workgroup)) {
 507                 cli_shutdown(c);
 508                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 509                                 newserver, newshare, pp_workgroup,
 510                                 pp_username, pp_password, in_cache);
 511                 TALLOC_FREE(newserver);
 512                 TALLOC_FREE(newshare);
 513                 return srv;
 514         }
 515
 516         /* must be a normal share */
 517
 518         status = cli_tree_connect(c, share, "?????", *pp_password,
 519                                   strlen(*pp_password)+1);
 520         if (!NT_STATUS_IS_OK(status)) {
 521                 errno = map_errno_from_nt_status(status);
 522                 cli_shutdown(c);
 523                 return NULL;
 524         }
 525
 526         DEBUG(4,(" tconx ok\n"));
 527
 528         /* Determine if this share supports case sensitivity */
 529         if (is_ipc) {
 530                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 531                 status = NT_STATUS_OK;
 532         } else {
 533                 status = cli_get_fs_attr_info(c, &fs_attrs);
 534         }
 535
 536         if (!NT_STATUS_IS_OK(status)) {
 537                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 538                           nt_errstr(status)));
 539
 540                 /*
 541                  * We can't determine the case sensitivity of the share. We
 542                  * have no choice but to use the user-specified case
 543                  * sensitivity setting.
 544                  */
 545                 if (smbc_getOptionCaseSensitive(context)) {
 546                         cli_set_case_sensitive(c, True);
 547                 } else {
 548                         cli_set_case_sensitive(c, False);
 549                 }
 550         } else if (!is_ipc) {
 551                 DEBUG(4, ("Case sensitive: %s\n",
 552                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 553                            ? "True"
 554                            : "False")));
 555                 cli_set_case_sensitive(c,
 556                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 557                                         ? True
 558                                         : False));
 559         }
 560
 561         if (context->internal->smb_encryption_level) {
 562                 /* Attempt UNIX smb encryption. */
 563                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 564                                                           username_used,
 565                                                           *pp_password,
 566                                                           *pp_workgroup))) {
 567
 568                         /*
 569                          * context->smb_encryption_level == 1
 570                          * means don't fail if encryption can't be negotiated,
 571                          * == 2 means fail if encryption can't be negotiated.
 572                          */
 573
 574                         DEBUG(4,(" SMB encrypt failed\n"));
 575
 576                         if (context->internal->smb_encryption_level == 2) {
 577                                 cli_shutdown(c);
 578                                 errno = EPERM;
 579                                 return NULL;
 580                         }
 581                 }
 582                 DEBUG(4,(" SMB encrypt ok\n"));
 583         }
 584
 585         /*
 586          * Ok, we have got a nice connection
 587          * Let's allocate a server structure.
 588          */
 589
 590         srv = SMB_MALLOC_P(SMBCSRV);
 591         if (!srv) {
 592                 cli_shutdown(c);
 593                 errno = ENOMEM;
 594                 return NULL;
 595         }
 596
 597         ZERO_STRUCTP(srv);
 598         srv->cli = c;
 599         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 600         srv->no_pathinfo = False;
 601         srv->no_pathinfo2 = False;
 602         srv->no_nt_session = False;
 603
 604 done:
 605         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 606                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 607         } else {
 608                 workgroup = *pp_workgroup;
 609         }
 610         if(!workgroup) {
 611                 if (c != NULL) {
 612                         cli_shutdown(c);
 613                 }
 614                 SAFE_FREE(srv);
 615                 return NULL;
 616         }
 617
 618         /* set the credentials to make DFS work */
 619         smbc_set_credentials_with_fallback(context,
 620                                            workgroup,
 621                                            *pp_username,
 622                                            *pp_password);
 623
 624         return srv;
 625 }
 626
 627 SMBCSRV *
 628 SMBC_server(TALLOC_CTX *ctx,
 629                 SMBCCTX *context,
 630                 bool connect_if_not_found,
 631                 const char *server,
 632                 const char *share,
 633                 char **pp_workgroup,
 634                 char **pp_username,
 635                 char **pp_password)
 636 {
 637         SMBCSRV *srv=NULL;
 638         bool in_cache = false;
 639
 640         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 641                         server, share, pp_workgroup,
 642                         pp_username, pp_password, &in_cache);
 643
 644         if (!srv) {
 645                 return NULL;
 646         }
 647         if (in_cache) {
 648                 return srv;
 649         }
 650
 651         /* Now add it to the cache (internal or external)  */
 652         /* Let the cache function set errno if it wants to */
 653         errno = 0;
 654         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 655                                                 server, share,
 656                                                 *pp_workgroup,
 657                                                 *pp_username)) {
 658                 int saved_errno = errno;
 659                 DEBUG(3, (" Failed to add server to cache\n"));
 660                 errno = saved_errno;
 661                 if (errno == 0) {
 662                         errno = ENOMEM;
 663                 }
 664                 SAFE_FREE(srv);
 665                 return NULL;
 666         }
 667
 668         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 669                 server, share, srv));
 670
 671         DLIST_ADD(context->internal->servers, srv);
 672         return srv;
 673 }
 674
 675 /*
 676  * Connect to a server for getting/setting attributes, possibly on an existing
 677  * connection.  This works similarly to SMBC_server().
 678  */
 679 SMBCSRV *
 680 SMBC_attr_server(TALLOC_CTX *ctx,
 681                  SMBCCTX *context,
 682                  const char *server,
 683                  const char *share,
 684                  char **pp_workgroup,
 685                  char **pp_username,
 686                  char **pp_password)
 687 {
 688         int flags;
 689         struct cli_state *ipc_cli = NULL;
 690         struct rpc_pipe_client *pipe_hnd = NULL;
 691         NTSTATUS nt_status;
 692         SMBCSRV *srv=NULL;
 693         SMBCSRV *ipc_srv=NULL;
 694
 695         /*
 696          * Use srv->cli->desthost and srv->cli->share instead of
 697          * server and share below to connect to the actual share,
 698          * i.e., a normal share or a referred share from
 699          * 'msdfs proxy' share.
 700          */
 701         srv = SMBC_server(ctx, context, true, server, share,
 702                         pp_workgroup, pp_username, pp_password);
 703         if (!srv) {
 704                 return NULL;
 705         }
 706         server = smbXcli_conn_remote_name(srv->cli->conn);
 707         share = srv->cli->share;
 708
 709         /*
 710          * See if we've already created this special connection.  Reference
 711          * our "special" share name '*IPC$', which is an impossible real share
 712          * name due to the leading asterisk.
 713          */
 714         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 715                                    pp_workgroup, pp_username, pp_password);
 716         if (!ipc_srv) {
 717
 718                 /* We didn't find a cached connection.  Get the password */
 719                 if (!*pp_password || (*pp_password)[0] == '\0') {
 720                         /* ... then retrieve it now. */
 721                         SMBC_call_auth_fn(ctx, context, server, share,
 722                                           pp_workgroup,
 723                                           pp_username,
 724                                           pp_password);
 725                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 726                                 errno = ENOMEM;
 727                                 return NULL;
 728                         }
 729                 }
 730
 731                 flags = 0;
 732                 if (smbc_getOptionUseKerberos(context)) {
 733                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 734                 }
 735                 if (smbc_getOptionUseCCache(context)) {
 736                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 737                 }
 738
 739                 nt_status = cli_full_connection(&ipc_cli,
 740                                                 lp_netbios_name(), server,
 741                                                 NULL, 0, "IPC$", "?????",
 742                                                 *pp_username,
 743                                                 *pp_workgroup,
 744                                                 *pp_password,
 745                                                 flags,
 746                                                 SMB_SIGNING_DEFAULT);
 747                 if (! NT_STATUS_IS_OK(nt_status)) {
 748                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 749                                  nt_errstr(nt_status)));
 750                         errno = ENOTSUP;
 751                         return NULL;
 752                 }
 753
 754                 if (context->internal->smb_encryption_level) {
 755                         /* Attempt UNIX smb encryption. */
 756                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 757                                                                   *pp_username,
 758                                                                   *pp_password,
 759                                                                   *pp_workgroup))) {
 760
 761                                 /*
 762                                  * context->smb_encryption_level ==
 763                                  * 1 means don't fail if encryption can't be
 764                                  * negotiated, == 2 means fail if encryption
 765                                  * can't be negotiated.
 766                                  */
 767
 768                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 769
 770                                 if (context->internal->smb_encryption_level == 2) {
 771                                         cli_shutdown(ipc_cli);
 772                                         errno = EPERM;
 773                                         return NULL;
 774                                 }
 775                         }
 776                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 777                 }
 778
 779                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 780                 if (!ipc_srv) {
 781                         errno = ENOMEM;
 782                         cli_shutdown(ipc_cli);
 783                         return NULL;
 784                 }
 785
 786                 ZERO_STRUCTP(ipc_srv);
 787                 ipc_srv->cli = ipc_cli;
 788
 789                 nt_status = cli_rpc_pipe_open_noauth(
 790                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 791                 if (!NT_STATUS_IS_OK(nt_status)) {
 792                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 793                         errno = ENOTSUP;
 794                         cli_shutdown(ipc_srv->cli);
 795                         free(ipc_srv);
 796                         return NULL;
 797                 }
 798
 799                 /*
 800                  * Some systems don't support
 801                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 802                  * so we might as well do it too.
 803                  */
 804
 805                 nt_status = rpccli_lsa_open_policy(
 806                         pipe_hnd,
 807                         talloc_tos(),
 808                         True,
 809                         GENERIC_EXECUTE_ACCESS,
 810                         &ipc_srv->pol);
 811
 812                 if (!NT_STATUS_IS_OK(nt_status)) {
 813                         errno = SMBC_errno(context, ipc_srv->cli);
 814                         cli_shutdown(ipc_srv->cli);
 815                         return NULL;
 816                 }
 817
 818                 /* now add it to the cache (internal or external) */
 819
 820                 errno = 0;      /* let cache function set errno if it likes */
 821                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 822                                                              server,
 823                                                              "*IPC$",
 824                                                              *pp_workgroup,
 825                                                              *pp_username)) {
 826                         DEBUG(3, (" Failed to add server to cache\n"));
 827                         if (errno == 0) {
 828                                 errno = ENOMEM;
 829                         }
 830                         cli_shutdown(ipc_srv->cli);
 831                         free(ipc_srv);
 832                         return NULL;
 833                 }
 834
 835                 DLIST_ADD(context->internal->servers, ipc_srv);
 836         }
 837
 838         return ipc_srv;
 839 }