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 #include "../librpc/gen_ndr/ndr_lsa.h"
  30 #include "rpc_client/cli_lsarpc.h"
  31
  32 /*
  33  * Check a server for being alive and well.
  34  * returns 0 if the server is in shape. Returns 1 on error
  35  *
  36  * Also useable outside libsmbclient to enable external cache
  37  * to do some checks too.
  38  */
  39 int
  40 SMBC_check_server(SMBCCTX * context,
  41                   SMBCSRV * server)
  42 {
  43         socklen_t size;
  44         struct sockaddr addr;
  45
  46         size = sizeof(addr);
  47         return (getpeername(server->cli->fd, &addr, &size) == -1);
  48 }
  49
  50 /*
  51  * Remove a server from the cached server list it's unused.
  52  * On success, 0 is returned. 1 is returned if the server could not be removed.
  53  *
  54  * Also useable outside libsmbclient
  55  */
  56 int
  57 SMBC_remove_unused_server(SMBCCTX * context,
  58                           SMBCSRV * srv)
  59 {
  60         SMBCFILE * file;
  61
  62         /* are we being fooled ? */
  63         if (!context || !context->internal->initialized || !srv) {
  64                 return 1;
  65         }
  66
  67         /* Check all open files/directories for a relation with this server */
  68         for (file = context->internal->files; file; file = file->next) {
  69                 if (file->srv == srv) {
  70                         /* Still used */
  71                         DEBUG(3, ("smbc_remove_usused_server: "
  72                                   "%p still used by %p.\n",
  73                                   srv, file));
  74                         return 1;
  75                 }
  76         }
  77
  78         DLIST_REMOVE(context->internal->servers, srv);
  79
  80         cli_shutdown(srv->cli);
  81         srv->cli = NULL;
  82
  83         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  84
  85         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  86
  87         SAFE_FREE(srv);
  88         return 0;
  89 }
  90
  91 /****************************************************************
  92  * Call the auth_fn with fixed size (fstring) buffers.
  93  ***************************************************************/
  94 void
  95 SMBC_call_auth_fn(TALLOC_CTX *ctx,
  96                   SMBCCTX *context,
  97                   const char *server,
  98                   const char *share,
  99                   char **pp_workgroup,
 100                   char **pp_username,
 101                   char **pp_password)
 102 {
 103         fstring workgroup;
 104         fstring username;
 105         fstring password;
 106         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 107
 108         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 109         strlcpy(username, *pp_username, sizeof(username));
 110         strlcpy(password, *pp_password, sizeof(password));
 111
 112         /* See if there's an authentication with context function provided */
 113         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 114         if (auth_with_context_fn)
 115         {
 116             (* auth_with_context_fn)(context,
 117                                      server, share,
 118                                      workgroup, sizeof(workgroup),
 119                                      username, sizeof(username),
 120                                      password, sizeof(password));
 121         }
 122         else
 123         {
 124             smbc_getFunctionAuthData(context)(server, share,
 125                                               workgroup, sizeof(workgroup),
 126                                               username, sizeof(username),
 127                                               password, sizeof(password));
 128         }
 129
 130         TALLOC_FREE(*pp_workgroup);
 131         TALLOC_FREE(*pp_username);
 132         TALLOC_FREE(*pp_password);
 133
 134         *pp_workgroup = talloc_strdup(ctx, workgroup);
 135         *pp_username = talloc_strdup(ctx, username);
 136         *pp_password = talloc_strdup(ctx, password);
 137 }
 138
 139
 140 void
 141 SMBC_get_auth_data(const char *server, const char *share,
 142                    char *workgroup_buf, int workgroup_buf_len,
 143                    char *username_buf, int username_buf_len,
 144                    char *password_buf, int password_buf_len)
 145 {
 146         /* Default function just uses provided data.  Nothing to do. */
 147 }
 148
 149
 150
 151 SMBCSRV *
 152 SMBC_find_server(TALLOC_CTX *ctx,
 153                  SMBCCTX *context,
 154                  const char *server,
 155                  const char *share,
 156                  char **pp_workgroup,
 157                  char **pp_username,
 158                  char **pp_password)
 159 {
 160         SMBCSRV *srv;
 161         int auth_called = 0;
 162
 163         if (!pp_workgroup || !pp_username || !pp_password) {
 164                 return NULL;
 165         }
 166
 167 check_server_cache:
 168
 169         srv = smbc_getFunctionGetCachedServer(context)(context,
 170                                                        server, share,
 171                                                        *pp_workgroup,
 172                                                        *pp_username);
 173
 174         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 175                                      !*pp_password || !(*pp_password)[0])) {
 176                 SMBC_call_auth_fn(ctx, context, server, share,
 177                                   pp_workgroup, pp_username, pp_password);
 178
 179                 /*
 180                  * However, smbc_auth_fn may have picked up info relating to
 181                  * an existing connection, so try for an existing connection
 182                  * again ...
 183                  */
 184                 auth_called = 1;
 185                 goto check_server_cache;
 186
 187         }
 188
 189         if (srv) {
 190                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 191                         /*
 192                          * This server is no good anymore
 193                          * Try to remove it and check for more possible
 194                          * servers in the cache
 195                          */
 196                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 197                                                                         srv)) {
 198                                 /*
 199                                  * We could not remove the server completely,
 200                                  * remove it from the cache so we will not get
 201                                  * it again. It will be removed when the last
 202                                  * file/dir is closed.
 203                                  */
 204                                 smbc_getFunctionRemoveCachedServer(context)(context,
 205                                                                             srv);
 206                         }
 207
 208                         /*
 209                          * Maybe there are more cached connections to this
 210                          * server
 211                          */
 212                         goto check_server_cache;
 213                 }
 214
 215                 return srv;
 216         }
 217
 218         return NULL;
 219 }
 220
 221 /*
 222  * Connect to a server, possibly on an existing connection
 223  *
 224  * Here, what we want to do is: If the server and username
 225  * match an existing connection, reuse that, otherwise, establish a
 226  * new connection.
 227  *
 228  * If we have to create a new connection, call the auth_fn to get the
 229  * info we need, unless the username and password were passed in.
 230  */
 231
 232 static SMBCSRV *
 233 SMBC_server_internal(TALLOC_CTX *ctx,
 234             SMBCCTX *context,
 235             bool connect_if_not_found,
 236             const char *server,
 237             const char *share,
 238             char **pp_workgroup,
 239             char **pp_username,
 240             char **pp_password,
 241             bool *in_cache)
 242 {
 243         SMBCSRV *srv=NULL;
 244         char *workgroup = NULL;
 245         struct cli_state *c;
 246         struct nmb_name called, calling;
 247         const char *server_n = server;
 248         struct sockaddr_storage ss;
 249         int tried_reverse = 0;
 250         int port_try_first;
 251         int port_try_next;
 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
 258         zero_sockaddr(&ss);
 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 != '\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 (srv->cli->cnum == (uint16) -1) {
 295                         /* Ensure we have accurate auth info */
 296                         SMBC_call_auth_fn(ctx, context,
 297                                           srv->cli->desthost,
 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_tcon_andx(srv->cli, srv->cli->share, "?????",
 319                                                *pp_password,
 320                                                strlen(*pp_password)+1);
 321                         if (!NT_STATUS_IS_OK(status)) {
 322                                 errno = map_errno_from_nt_status(status);
 323                                 cli_shutdown(srv->cli);
 324                                 srv->cli = NULL;
 325                                 smbc_getFunctionRemoveCachedServer(context)(context,
 326                                                                             srv);
 327                                 srv = NULL;
 328                         }
 329
 330                         /* Determine if this share supports case sensitivity */
 331                         if (is_ipc) {
 332                                 DEBUG(4,
 333                                       ("IPC$ so ignore case sensitivity\n"));
 334                         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 335                                 DEBUG(4, ("Could not retrieve "
 336                                           "case sensitivity flag: %s.\n",
 337                                           cli_errstr(c)));
 338
 339                                 /*
 340                                  * We can't determine the case sensitivity of
 341                                  * the share. We have no choice but to use the
 342                                  * user-specified case sensitivity setting.
 343                                  */
 344                                 if (smbc_getOptionCaseSensitive(context)) {
 345                                         cli_set_case_sensitive(c, True);
 346                                 } else {
 347                                         cli_set_case_sensitive(c, False);
 348                                 }
 349                         } else {
 350                                 DEBUG(4,
 351                                       ("Case sensitive: %s\n",
 352                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 353                                         ? "True"
 354                                         : "False")));
 355                                 cli_set_case_sensitive(
 356                                         c,
 357                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 358                                          ? True
 359                                          : False));
 360                         }
 361
 362                         /*
 363                          * Regenerate the dev value since it's based on both
 364                          * server and share
 365                          */
 366                         if (srv) {
 367                                 srv->dev = (dev_t)(str_checksum(srv->cli->desthost) ^
 368                                                    str_checksum(srv->cli->share));
 369                         }
 370                 }
 371         }
 372
 373         /* If we have a connection... */
 374         if (srv) {
 375
 376                 /* ... then we're done here.  Give 'em what they came for. */
 377                 *in_cache = true;
 378                 goto done;
 379         }
 380
 381         /* If we're not asked to connect when a connection doesn't exist... */
 382         if (! connect_if_not_found) {
 383                 /* ... then we're done here. */
 384                 return NULL;
 385         }
 386
 387         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 388                 errno = ENOMEM;
 389                 return NULL;
 390         }
 391
 392         make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
 393         make_nmb_name(&called , server, 0x20);
 394
 395         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 396
 397         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 398
 399 again:
 400
 401         zero_sockaddr(&ss);
 402
 403         /* have to open a new connection */
 404         if ((c = cli_initialise()) == NULL) {
 405                 errno = ENOMEM;
 406                 return NULL;
 407         }
 408
 409         if (smbc_getOptionUseKerberos(context)) {
 410                 c->use_kerberos = True;
 411         }
 412
 413         if (smbc_getOptionFallbackAfterKerberos(context)) {
 414                 c->fallback_after_kerberos = True;
 415         }
 416
 417         if (smbc_getOptionUseCCache(context)) {
 418                 c->use_ccache = True;
 419         }
 420
 421         c->timeout = smbc_getTimeout(context);
 422
 423         /*
 424          * Force use of port 139 for first try if share is $IPC, empty, or
 425          * null, so browse lists can work
 426          */
 427         if (share == NULL || *share == '\0' || is_ipc) {
 428                 port_try_first = 139;
 429                 port_try_next = 445;
 430         } else {
 431                 port_try_first = 445;
 432                 port_try_next = 139;
 433         }
 434
 435         c->port = port_try_first;
 436
 437         status = cli_connect(c, server_n, &ss);
 438         if (!NT_STATUS_IS_OK(status)) {
 439
 440                 /* First connection attempt failed.  Try alternate port. */
 441                 c->port = port_try_next;
 442
 443                 status = cli_connect(c, server_n, &ss);
 444                 if (!NT_STATUS_IS_OK(status)) {
 445                         cli_shutdown(c);
 446                         errno = ETIMEDOUT;
 447                         return NULL;
 448                 }
 449         }
 450
 451         if (!cli_session_request(c, &calling, &called)) {
 452                 cli_shutdown(c);
 453                 if (strcmp(called.name, "*SMBSERVER")) {
 454                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 455                         goto again;
 456                 } else {  /* Try one more time, but ensure we don't loop */
 457
 458                         /* Only try this if server is an IP address ... */
 459
 460                         if (is_ipaddress(server) && !tried_reverse) {
 461                                 fstring remote_name;
 462                                 struct sockaddr_storage rem_ss;
 463
 464                                 if (!interpret_string_addr(&rem_ss, server,
 465                                                            NI_NUMERICHOST)) {
 466                                         DEBUG(4, ("Could not convert IP address "
 467                                                   "%s to struct sockaddr_storage\n",
 468                                                   server));
 469                                         errno = ETIMEDOUT;
 470                                         return NULL;
 471                                 }
 472
 473                                 tried_reverse++; /* Yuck */
 474
 475                                 if (name_status_find("*", 0, 0,
 476                                                      &rem_ss, remote_name)) {
 477                                         make_nmb_name(&called,
 478                                                       remote_name,
 479                                                       0x20);
 480                                         goto again;
 481                                 }
 482                         }
 483                 }
 484                 errno = ETIMEDOUT;
 485                 return NULL;
 486         }
 487
 488         DEBUG(4,(" session request ok\n"));
 489
 490         status = cli_negprot(c);
 491
 492         if (!NT_STATUS_IS_OK(status)) {
 493                 cli_shutdown(c);
 494                 errno = ETIMEDOUT;
 495                 return NULL;
 496         }
 497
 498         username_used = *pp_username;
 499
 500         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 501                                                *pp_password,
 502                                                strlen(*pp_password),
 503                                                *pp_password,
 504                                                strlen(*pp_password),
 505                                                *pp_workgroup))) {
 506
 507                 /* Failed.  Try an anonymous login, if allowed by flags. */
 508                 username_used = "";
 509
 510                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 511                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 512                                                        *pp_password, 1,
 513                                                        *pp_password, 0,
 514                                                        *pp_workgroup))) {
 515
 516                         cli_shutdown(c);
 517                         errno = EPERM;
 518                         return NULL;
 519                 }
 520         }
 521
 522         status = cli_init_creds(c, username_used,
 523                                 *pp_workgroup, *pp_password);
 524         if (!NT_STATUS_IS_OK(status)) {
 525                 errno = map_errno_from_nt_status(status);
 526                 cli_shutdown(c);
 527                 return NULL;
 528         }
 529
 530         DEBUG(4,(" session setup ok\n"));
 531
 532         /* here's the fun part....to support 'msdfs proxy' shares
 533            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 534            here before trying to connect to the original share.
 535            cli_check_msdfs_proxy() will fail if it is a normal share. */
 536
 537         if ((c->capabilities & CAP_DFS) &&
 538                         cli_check_msdfs_proxy(ctx, c, share,
 539                                 &newserver, &newshare,
 540                                 /* FIXME: cli_check_msdfs_proxy() does
 541                                    not support smbc_smb_encrypt_level type */
 542                                 context->internal->smb_encryption_level ?
 543                                         true : false,
 544                                 *pp_username,
 545                                 *pp_password,
 546                                 *pp_workgroup)) {
 547                 cli_shutdown(c);
 548                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 549                                 newserver, newshare, pp_workgroup,
 550                                 pp_username, pp_password, in_cache);
 551                 TALLOC_FREE(newserver);
 552                 TALLOC_FREE(newshare);
 553                 return srv;
 554         }
 555
 556         /* must be a normal share */
 557
 558         status = cli_tcon_andx(c, share, "?????", *pp_password,
 559                                strlen(*pp_password)+1);
 560         if (!NT_STATUS_IS_OK(status)) {
 561                 errno = map_errno_from_nt_status(status);
 562                 cli_shutdown(c);
 563                 return NULL;
 564         }
 565
 566         DEBUG(4,(" tconx ok\n"));
 567
 568         /* Determine if this share supports case sensitivity */
 569         if (is_ipc) {
 570                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 571         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 572                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 573                           cli_errstr(c)));
 574
 575                 /*
 576                  * We can't determine the case sensitivity of the share. We
 577                  * have no choice but to use the user-specified case
 578                  * sensitivity setting.
 579                  */
 580                 if (smbc_getOptionCaseSensitive(context)) {
 581                         cli_set_case_sensitive(c, True);
 582                 } else {
 583                         cli_set_case_sensitive(c, False);
 584                 }
 585         } else {
 586                 DEBUG(4, ("Case sensitive: %s\n",
 587                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 588                            ? "True"
 589                            : "False")));
 590                 cli_set_case_sensitive(c,
 591                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 592                                         ? True
 593                                         : False));
 594         }
 595
 596         if (context->internal->smb_encryption_level) {
 597                 /* Attempt UNIX smb encryption. */
 598                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 599                                                           username_used,
 600                                                           *pp_password,
 601                                                           *pp_workgroup))) {
 602
 603                         /*
 604                          * context->smb_encryption_level == 1
 605                          * means don't fail if encryption can't be negotiated,
 606                          * == 2 means fail if encryption can't be negotiated.
 607                          */
 608
 609                         DEBUG(4,(" SMB encrypt failed\n"));
 610
 611                         if (context->internal->smb_encryption_level == 2) {
 612                                 cli_shutdown(c);
 613                                 errno = EPERM;
 614                                 return NULL;
 615                         }
 616                 }
 617                 DEBUG(4,(" SMB encrypt ok\n"));
 618         }
 619
 620         /*
 621          * Ok, we have got a nice connection
 622          * Let's allocate a server structure.
 623          */
 624
 625         srv = SMB_MALLOC_P(SMBCSRV);
 626         if (!srv) {
 627                 cli_shutdown(c);
 628                 errno = ENOMEM;
 629                 return NULL;
 630         }
 631
 632         ZERO_STRUCTP(srv);
 633         srv->cli = c;
 634         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 635         srv->no_pathinfo = False;
 636         srv->no_pathinfo2 = False;
 637         srv->no_nt_session = False;
 638
 639 done:
 640         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 641                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 642         } else {
 643                 workgroup = *pp_workgroup;
 644         }
 645         if(!workgroup) {
 646                 return NULL;
 647         }
 648
 649         /* set the credentials to make DFS work */
 650         smbc_set_credentials_with_fallback(context,
 651                                            workgroup,
 652                                            *pp_username,
 653                                            *pp_password);
 654
 655         return srv;
 656 }
 657
 658 SMBCSRV *
 659 SMBC_server(TALLOC_CTX *ctx,
 660                 SMBCCTX *context,
 661                 bool connect_if_not_found,
 662                 const char *server,
 663                 const char *share,
 664                 char **pp_workgroup,
 665                 char **pp_username,
 666                 char **pp_password)
 667 {
 668         SMBCSRV *srv=NULL;
 669         bool in_cache = false;
 670
 671         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 672                         server, share, pp_workgroup,
 673                         pp_username, pp_password, &in_cache);
 674
 675         if (!srv) {
 676                 return NULL;
 677         }
 678         if (in_cache) {
 679                 return srv;
 680         }
 681
 682         /* Now add it to the cache (internal or external)  */
 683         /* Let the cache function set errno if it wants to */
 684         errno = 0;
 685         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 686                                                 server, share,
 687                                                 *pp_workgroup,
 688                                                 *pp_username)) {
 689                 int saved_errno = errno;
 690                 DEBUG(3, (" Failed to add server to cache\n"));
 691                 errno = saved_errno;
 692                 if (errno == 0) {
 693                         errno = ENOMEM;
 694                 }
 695                 SAFE_FREE(srv);
 696                 return NULL;
 697         }
 698
 699         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 700                 server, share, srv));
 701
 702         DLIST_ADD(context->internal->servers, srv);
 703         return srv;
 704 }
 705
 706 /*
 707  * Connect to a server for getting/setting attributes, possibly on an existing
 708  * connection.  This works similarly to SMBC_server().
 709  */
 710 SMBCSRV *
 711 SMBC_attr_server(TALLOC_CTX *ctx,
 712                  SMBCCTX *context,
 713                  const char *server,
 714                  const char *share,
 715                  char **pp_workgroup,
 716                  char **pp_username,
 717                  char **pp_password)
 718 {
 719         int flags;
 720         struct sockaddr_storage ss;
 721         struct cli_state *ipc_cli = NULL;
 722         struct rpc_pipe_client *pipe_hnd = NULL;
 723         NTSTATUS nt_status;
 724         SMBCSRV *srv=NULL;
 725         SMBCSRV *ipc_srv=NULL;
 726
 727         /*
 728          * Use srv->cli->desthost and srv->cli->share instead of
 729          * server and share below to connect to the actual share,
 730          * i.e., a normal share or a referred share from
 731          * 'msdfs proxy' share.
 732          */
 733         srv = SMBC_server(ctx, context, true, server, share,
 734                         pp_workgroup, pp_username, pp_password);
 735         if (!srv) {
 736                 return NULL;
 737         }
 738         server = srv->cli->desthost;
 739         share = srv->cli->share;
 740
 741         /*
 742          * See if we've already created this special connection.  Reference
 743          * our "special" share name '*IPC$', which is an impossible real share
 744          * name due to the leading asterisk.
 745          */
 746         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 747                                    pp_workgroup, pp_username, pp_password);
 748         if (!ipc_srv) {
 749
 750                 /* We didn't find a cached connection.  Get the password */
 751                 if (!*pp_password || (*pp_password)[0] == '\0') {
 752                         /* ... then retrieve it now. */
 753                         SMBC_call_auth_fn(ctx, context, server, share,
 754                                           pp_workgroup,
 755                                           pp_username,
 756                                           pp_password);
 757                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 758                                 errno = ENOMEM;
 759                                 return NULL;
 760                         }
 761                 }
 762
 763                 flags = 0;
 764                 if (smbc_getOptionUseKerberos(context)) {
 765                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 766                 }
 767                 if (smbc_getOptionUseCCache(context)) {
 768                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 769                 }
 770
 771                 zero_sockaddr(&ss);
 772                 nt_status = cli_full_connection(&ipc_cli,
 773                                                 global_myname(), server,
 774                                                 &ss, 0, "IPC$", "?????",
 775                                                 *pp_username,
 776                                                 *pp_workgroup,
 777                                                 *pp_password,
 778                                                 flags,
 779                                                 Undefined, NULL);
 780                 if (! NT_STATUS_IS_OK(nt_status)) {
 781                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 782                                  nt_errstr(nt_status)));
 783                         errno = ENOTSUP;
 784                         return NULL;
 785                 }
 786
 787                 if (context->internal->smb_encryption_level) {
 788                         /* Attempt UNIX smb encryption. */
 789                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 790                                                                   *pp_username,
 791                                                                   *pp_password,
 792                                                                   *pp_workgroup))) {
 793
 794                                 /*
 795                                  * context->smb_encryption_level ==
 796                                  * 1 means don't fail if encryption can't be
 797                                  * negotiated, == 2 means fail if encryption
 798                                  * can't be negotiated.
 799                                  */
 800
 801                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 802
 803                                 if (context->internal->smb_encryption_level == 2) {
 804                                         cli_shutdown(ipc_cli);
 805                                         errno = EPERM;
 806                                         return NULL;
 807                                 }
 808                         }
 809                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 810                 }
 811
 812                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 813                 if (!ipc_srv) {
 814                         errno = ENOMEM;
 815                         cli_shutdown(ipc_cli);
 816                         return NULL;
 817                 }
 818
 819                 ZERO_STRUCTP(ipc_srv);
 820                 ipc_srv->cli = ipc_cli;
 821
 822                 nt_status = cli_rpc_pipe_open_noauth(
 823                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 824                 if (!NT_STATUS_IS_OK(nt_status)) {
 825                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 826                         errno = ENOTSUP;
 827                         cli_shutdown(ipc_srv->cli);
 828                         free(ipc_srv);
 829                         return NULL;
 830                 }
 831
 832                 /*
 833                  * Some systems don't support
 834                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 835                  * so we might as well do it too.
 836                  */
 837
 838                 nt_status = rpccli_lsa_open_policy(
 839                         pipe_hnd,
 840                         talloc_tos(),
 841                         True,
 842                         GENERIC_EXECUTE_ACCESS,
 843                         &ipc_srv->pol);
 844
 845                 if (!NT_STATUS_IS_OK(nt_status)) {
 846                         errno = SMBC_errno(context, ipc_srv->cli);
 847                         cli_shutdown(ipc_srv->cli);
 848                         return NULL;
 849                 }
 850
 851                 /* now add it to the cache (internal or external) */
 852
 853                 errno = 0;      /* let cache function set errno if it likes */
 854                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 855                                                              server,
 856                                                              "*IPC$",
 857                                                              *pp_workgroup,
 858                                                              *pp_username)) {
 859                         DEBUG(3, (" Failed to add server to cache\n"));
 860                         if (errno == 0) {
 861                                 errno = ENOMEM;
 862                         }
 863                         cli_shutdown(ipc_srv->cli);
 864                         free(ipc_srv);
 865                         return NULL;
 866                 }
 867
 868                 DLIST_ADD(context->internal->servers, ipc_srv);
 869         }
 870
 871         return ipc_srv;
 872 }